CN106987168A - Water-resistant putty for interior walls - Google Patents

Abstract

A water-proof putty for internal wall surface is prepared from basic material and water-proof additive (4-10 wt.%), and the basic material is prepared from talc powder, heavy calcium carbonate, lime calcium and lignocellulose through mixing, and the water-proof additive is prepared from composite powder, adhesive and composite epoxy resin through mixing. The waterproof additive containing special components not only improves the waterproof performance and hardness of the putty powder, but also improves the bonding strength among the components in the putty powder so that the putty powder is not easy to fall off.

Description

Water-resistant putty for interior walls

technical field

The invention relates to putty powder used in the field of building materials, in particular to a water-resistant putty for interior walls.

Background technique

Putty, also known as putty powder, is a kind of building decoration material and a base material for wall repair and leveling, which lays a good foundation for the next step of decoration (painting and wallpaper). It is divided into two kinds: putty inside wall and putty on exterior wall. External wall putty can resist wind and sun, so it has good gelation, high strength and low environmental index. The comprehensive index of putty in the inner wall is good, and it is hygienic and environmentally friendly. Therefore, the inner wall is not for external use and the outer wall is not for internal use. The main components of the existing water-resistant putty powder for interior walls are heavy calcium (or talcum powder), cement, cellulose, etc., but due to the problems in its formula itself, its water resistance is relatively general. In the prior art, in order to improve the putty powder For water resistance, it is generally used to increase the amount of adhesives such as cement or rubber powder, but the actual effect is not ideal.

Contents of the invention

The object of the present invention is to provide a kind of water-resistant putty for inner wall. By adding special water-resistant additives to the conventional inner wall water-resistant putty powder formula, not only the water resistance and hardness of the putty powder are improved, but also the putty is improved. The bonding strength between the components makes it more difficult to fall off.

The technical solution adopted by the present invention to achieve the above technical purpose is: a kind of water-resistant putty for interior wall, according to the weight ratio, it is formed by mixing base material and 4-10% of its weight water-resistant additive, and the base material is made of talcum powder , heavy calcium, gray calcium and lignocellulose are mixed in a weight ratio of 24-28: 12-18: 14-16: 2-3, and the water resistant additive is composed of composite powder, composite powder weight 20-30% It is formed by mixing composite epoxy resin with 10-15% weight of composite powder and composite powder, wherein the composite powder is silicon carbide, carbon powder and aluminum hydroxide are mixed according to the ratio of 5-6:2-3:1-2 by weight and Sintered at 1600°C for 4-5 hours, cooled and mixed with sepiolite wool with a weight of 10-20% of silicon carbide, and then ground to obtain a mixed powder with a particle size of no more than 325 mesh; the binder is made of alumina micropowder, modified The modified nano-silica, polyethylene glycol and water are mixed according to the weight ratio of 9-11:5-7:20-24:30-36 and then evaporated to dryness at 100-120°C; the modified nanometer Silicon oxide is commercially available nano-silica, benzoic acid, acetone and KH560 mixed according to the ratio of 600-800:4-5:2-3:40 by weight; the composite epoxy resin consists of 4 parts of bisphenol Type A epoxy resin, 0.5 part of butylene epoxy resin, 0.5 part of glycerin epoxy resin, 2 parts of diisocyanate and 2 parts of modified silica sol are made, and the modified silica sol is made from commercially available silicon Add 2-3% of silica sol weight silica micropowder, 0.8-1% silica sol weight sodium acetate and 3-4% silica sol weight KH560 to the sol, and then stir at 70-80°C for 1-2h to obtain mixture.

The composite powder is cooled and pulverized after sintering, which refers to rapid cooling at a cooling rate of 600-700° C./min and then mixed with sepiolite wool and pulverized until the particle size does not exceed 325 mesh.

The binding agent also contains 1-1.2 times the weight of alumina micropowder of hydroxyethyl cellulose and 20-30% of the weight of alumina micropowder of silicon micropowder.

The modified diatomite containing talcum powder weight 6-10% in the base material, the preparation method of the modified diatomite is: first take methyl methacrylate, Ethyl cellulose and KH560 are uniformly mixed to form a mixed liquid, and then commercially available diatomaceous earth is mixed with a 7-8% mixed liquid by weight, and then obtained by ultrasonic treatment with a frequency of 250-270KHz for 2-3 minutes.

The base material contains 8-10% of talcum powder weight hydroxypropyl methylcellulose type putty rubber powder and 4-6% of talcum powder weight modified starch, and the preparation method of the modified starch is as follows: Add to water 3-5 times its weight and mix evenly, then add 8%-10% of starch weight tin coupling agent to it and adjust the pH value to 4-5 with sulfuric acid, then add 1-3% starch weight to it Eucommia ulmoides extract, mixed evenly, adjusted the temperature to 60-65°C and kept it warm for 2-3h, finally added stearic acid with 4-5% starch weight, stirred evenly, and dried at 100-110°C until constant The modified starch is obtained; the Eucommia ulmoides extract is the powder obtained by boiling the leaves of Eucommia ulmoides in water for 20-30 minutes and then filtering off the solid residue and evaporating to dryness.

When the Eucommia extract is prepared, the leaves of Eucommia are first processed as follows:

1) After cleaning the leaves of Eucommia ulmoides with water, soak them in a sodium chloride solution with a mass concentration of 30% for 2 hours, then take them out and soak them in a sodium hydroxide solution with a mass concentration of 35% for 20 minutes, then take them out and rinse them with clean water ;

Among them, after soaking Eucommia leaves in sodium hydroxide solution for 10 minutes, microwave treatment with a power of 400W was applied to the solution for 2 minutes;

2) Soak the eucommia leaves rinsed with clear water in step 1) in clear water 3-5 times its weight, then add cellulase at 1% of the weight of eucommia leaves, and let it stand for 3-4 hours, then remove the eucommia leaves After it comes out, wash it with clear water to complete the treatment of the leaves of Eucommia ulmoides.

The preparation method of described composite epoxy resin comprises the following steps:

1) Prepare modified silica sol for subsequent use;

The modified silica sol is to add successively into the commercially available silica sol the silica micropowder of 2-3% of the silica sol weight, the sodium acetate of 0.8-1% of the silica sol weight and the KH560 of 3-4% of the silica sol weight, and then at 70 Stir the resulting mixture at -80°C for 1-2h;

2) Take each component according to the stated ratio, then melt the bisphenol A type epoxy resin, add the weighed butylene epoxy resin, glycerin epoxy resin and diisocyanate to it successively, stir until completely After melting, the temperature is lowered to 60-70° C., and then the modified silica sol prepared in step 1) is added therein, and the composite epoxy resin is obtained after stirring evenly.

Also added in the base material are 6-8% lime grass pulp and 0.5% lime calcium powder; Clean and squeeze the stalks to obtain the scorpion grass cake and juice, and the powder obtained by steaming the juice to dryness is the scorpion grass powder. Soak the scorpion grass cake in a sodium hydroxide solution with a mass concentration of 30% for 24-28 hours, and remove it. Then it is mixed with water 3-4 times of the weight of the straw cake, calcium oxide of 60% of the weight of the cake, and glass fiber of 40% of the weight of the cake, and then refined to obtain the straw pulp.

The preparation method of the water-resistant putty for the interior wall of the present invention first prepares composite powder, binder and composite epoxy resin respectively and mixes them in proportion to obtain a water-resistant additive, and then weighs talcum powder, heavy calcium, lime calcium, wood Cellulose and water-resistant additives, then mix ash calcium, lignocellulose and water-resistant additives, add 8-10 times the total weight of the three and add hot water at a temperature of 70-80°C, stir for 10-20 minutes, then heat to evaporate the water until it contains water The ratio is 40%. Finally, talcum powder and heavy calcium are added thereto, and the product is obtained by mixing evenly.

In the present invention, the putty powder also contains pig manure extract of 3-5% by weight of the base material, and the preparation method of the pig manure extract is as follows: dry the pig manure and grind it into powder, and mix it with 8-10 times its weight After mixing the water, add 3-4% of pig manure weight diethylhydroxylamine, then boil for 5-10min under the condition of air isolation, then cool and filter to obtain the filtrate, and then concentrate the filtrate to 10% of the original volume to obtain the pig Fecal extract;

Pig manure extract is made of pig manure, which is mixed with water and added with diethylhydroxylamine and then boiled under air-isolated conditions. Diethylhydroxylamine can effectively eliminate the odor in pig manure while consuming dissolved oxygen in water. After filtering, the organic oil contained in pig manure can be retained and concentrated. After it is added to the putty powder, it can fully combine with each component, and when the putty powder contains modified starch, it can Form an organic bonding system where organic oil and modified starch coexist to ensure the bonding strength of each component, thereby improving the strength and waterproof performance of the putty powder;

Compared with the existing water-resistant putty powder for interior walls, the present invention has the following beneficial effects:

1) The principle of the water resistance additive added in the present invention to enhance the water resistance of putty powder is simply explained as follows:

First of all, silicon carbide, carbon powder and aluminum hydroxide can be decomposed or oxidized at high temperature to produce a large number of pores, and the silicon oxide produced by the decomposition of silicon carbide and the aluminum oxide produced by the decomposition of aluminum hydroxide combine at high temperature to form mullite Reinforcement, thus forming a high-strength, high-porosity composite powder material, and the mixed sepiolite powder is also a porous material with a microporous structure, so the final composite powder is a mixed powder with many microporous structures material;

The binder is obtained by mixing alumina micropowder, modified nano-silica, polyethylene glycol and water and then evaporating the liquid at 100-120°C. During the evaporation process, polyethylene glycol can adhere to the oxidized The surface of aluminum micropowder and modified nano-silica, so that the surface properties of these two inorganic powders will change to a certain extent, so that it is easier to combine with the rest of the inorganic material components, and the bonding strength between the components is enhanced. ;

The composite epoxy resin is made of three kinds of epoxy resins, diisocyanate and modified silica sol. The epoxy group of the epoxy resin reacts to form a five-membered heterocyclic structure oxazolidinone composed of carbon, oxygen and nitrogen elements, which enhances the rigidity of the molecular chain, reduces the number of weak bonds and the number of hydroxyl groups on the main chain, thereby improving the The toughness, thermal stability, and water resistance of epoxy resin, so that when the composite epoxy resin is added to the putty powder, it can be used as a strong adhesive to combine with the components in the putty powder; at the same time, the modified silica sol is added to the system The combination of the two can greatly improve the mechanical and thermal properties of epoxy resin, and the addition of modified silica sol particles can greatly improve the mixing of components during the preparation process, the improvement of the tensile properties of the product, and the final interpenetrating shape of the product. favorable;

When preparing putty powder, when the composite powder is combined with the binder, a part of the alumina micropowder and modified nano-silica can enter and fill the micropore structure in the composite powder, thereby forming a reinforced powder with extremely irregular shape. These irregular-shaped reinforcing powders are in the putty powder. As time goes by, a part of alumina micropowder and modified nano-silica can slowly detach from the microporous structure and combine with components such as ash calcium in the putty powder. Combined, so as to slowly make up for the strength of the putty powder over time; and in the preparation process of the putty powder, first mix ash calcium, lignocellulose and water-resistant additives into hot water and stir, so that a part of ash calcium is filled to the micro In the pore structure or adhered to the surface, and the lignocellulose, binder and composite epoxy resin are fully combined, thereby enhancing the bonding performance between the components inside the putty powder, and improving its waterproof performance to a certain extent;

2) The binding agent in the water-resistant additive of the present invention can also contain hydroxyethyl cellulose and silicon micropowder. After the hydroxyethyl cellulose is dissolved in water, it can be guaranteed to form a uniformly dispersed glue in water due to its surface activity. Coagulation system, and then form a layer of protective colloid on the surface of silica micropowder, alumina micropowder and modified nano silica, which is equivalent to forming a layer of "lubricating film" on the surface of these three powders, so that the binder can be uniform Distributed in the putty powder, and then closely combine the components of the putty powder, thereby further enhancing the crack resistance, hardness and waterproof performance of the putty powder; and the silica micropowder contained in it is mixed with cement and calcium oxide in the putty powder After water, the alkaline activator calcium hydroxide is produced, and then gels such as calcium silicate hydrate are formed, which improves the strength of the putty powder, and these gelling components can promote the strength growth of the putty powder after construction (especially the tensile strength growth of);

3) Utilize benzoic acid, acetone and KH560 to carry out surface treatment to nano silicon dioxide in the binding agent of the present invention, thereby make its surface be subjected to the effect of hydroxyl group, in conjunction with a certain amount of oxygen-containing functional groups, increased surface compatibility, like this When it is fully mixed with other raw materials, because these particles are small and have a large specific surface area, the micronized structure increases the contact area of the other materials with them, so that they can be evenly dispersed in the material and physically interact with the rest of the materials. surface bonding;

4) Modified diatomite can be additionally added to the base material of the present invention so that it can be better combined with composite powder and binder, and the ultrasonic treatment adopted during diatomite modification can destroy a part of diatomite. It has a microporous structure, so that its inner and outer surfaces are in contact with the mixture formed by methyl methacrylate, ethyl cellulose and KH560 and evenly adhered to the inner and outer surfaces of diatomite, so that both the inner and outer surfaces are grafted with a large amount of These groups connect these two substances with modified nano-silica through chemical reactions, ensuring good interfacial bonding between the two and between the two and lime calcium, talcum powder and other components , so as to improve the bonding performance of the various components in the putty powder, and further enhance the strength and waterproof performance of the putty powder;

5) Hydroxypropyl methylcellulose type putty rubber powder and modified starch can also be added to the base material of the present invention to enhance the bonding strength between the components. Research has found that when the starch is modified, the Eucommia extract is added thereto The eucommia glucoside contained in the Eucommia ulmoides extract has multiple polar functional groups and is active in nature. Under the action of tin coupling agent and starch, a dialdehyde structure similar to glutaraldehyde is produced, so that the modified starch produced can be more It is uniformly dispersed in the putty powder, and can be combined with the organic modification ingredients contained in the composite powder, thereby further enhancing the bonding strength and waterproof performance of the putty powder;

6) When the present invention extracts Eucommia ulmoides extract from Eucommia leaves, Eucommia ulmoides leaves are sequentially soaked in sodium chloride solution and sodium hydroxide solution, which can cause damage to the surface cell wall to a certain extent, so that the effective Components can be more easily separated out through the cell membrane and cell wall, and the cellulose structure can become loose, so that it can be enzymatically hydrolyzed by cellulase, and then the active ingredients inside can be effectively separated out; the same , when immersed in sodium hydroxide solution, it is assisted by microwave, which can effectively remove lignin and pentosan contained in the cell wall of Eucommia leaves, thereby causing a greater degree of damage to the cell wall, so that the active ingredients in the cell can be separated out through the cell wall, Finally, the extraction rate of Eucommia glycosides was improved;

7) in the putty powder of the present invention, can also add scorpion grass pulp and scorpion grass powder, the scorpion grass cake that obtains after squeezing Scorpio grass is processed with sodium hydroxide, not only can make original cellulose become fluffy state by dense state, Not only can it be better combined with water and other components, but also a part of the cellulose is treated with sodium hydroxide to form a large amount of alkali-treated cellulose, which together with calcium oxide (calcium hydroxide) and glass fiber form a green grass Slurry, not only can closely combine diatomite, composite powder, lime calcium, talcum powder, etc., thereby further enhancing the crack resistance and waterproof performance of putty powder, and scorpion grass pulp can improve the cementation performance of putty powder, while scorpion grass The addition of powder can also play a certain role in auxiliary cementation;

8) The putty layer formed after construction has high surface hardness, good waterproof and air permeability

After the present invention is applied to the wall surface, some of the small particle components can penetrate into the wall surface, and then the expansion and crystallization reaction will occur, and the reaction will generate volume expansion crystals to fill in the base micro-cracks and trachoma, and the surface hardness of the formed putty layer High, strong anti-wear and washing ability, can be washed for a long time without peeling, foaming and falling off; and the formed putty layer not only has stable performance, can prolong the life of the decorative surface, but also has good air permeability, like human It can be waterproof and sweat-wicking like the skin of the skin. While waterproofing and penetrating, it can also evaporate and discharge the water in the matrix;

9) Wide range of uses

When the putty powder of the present invention is mixed with water and applied on the wall, a series of physical and chemical reactions can occur, and a molecular chain combination can be formed after the reaction, which can be widely used in concrete, wall bricks, ceramic tiles and even glass, etc. The surface decoration of the base material is suitable for indoor and outdoor wall decoration in residences, entertainment venues, hotels, shopping malls, hospitals, schools, kindergartens, etc., especially the putty layer formed by it has waterproof and breathable functions, and is more suitable for underground Decoration of interior and exterior walls in garages and coastal areas with high humidity.

detailed description

The present invention will be further elaborated below in conjunction with specific embodiments.

Example 1

A water-resistant putty for interior walls is formed by mixing a base material with 4% of its weight water-resistant additive according to the weight ratio, and the base material is made of talcum powder, heavy calcium, gray calcium and lignocellulose in a ratio of 24:12:14 : 2 weight ratio is mixed, and described water resistance additive is mixed by composite powder, the binding agent of composite powder weight 20% and the composite epoxy resin of composite powder weight 10%, wherein, composite powder is silicon carbide, carbon powder Mix with aluminum hydroxide in a weight ratio of 5:2:1, sinter at 1600°C for 4 hours, cool, mix with sepiolite wool with 10% by weight of silicon carbide, and grind to obtain a particle size of no more than 325 mesh. Powder; the binder is obtained by mixing alumina micropowder, modified nano-silica, polyethylene glycol and water in a weight ratio of 9:5:20:30 and then evaporating the liquid at 100°C; the modified Nano-silica is commercially available nano-silica, benzoic acid, acetone and KH560 mixed according to the ratio of 600:4:2:40 by weight; the composite epoxy resin consists of 4 parts of bisphenol A epoxy resin, 0.5 parts of butylene epoxy resin, 0.5 parts of glycerin epoxy resin, 2 parts of diisocyanate and 2 parts of modified silica sol, which are added in sequence in commercially available silica sol 2% silica sol weight silica powder, 0.8% silica sol weight sodium acetate and 3% silica sol weight KH560, and then stir the mixture obtained at 70°C for 1h;

The preparation method of the above-mentioned water-resistant putty for interior walls is as follows: firstly prepare composite powder, binder and composite epoxy resin respectively and mix them in proportion to obtain water-resistant additives, then weigh talcum powder, heavy calcium, gray calcium, wood Cellulose and water-resistant additives, then mix ash calcium, lignocellulose and water-resistant additives and add hot water with 8 times the total weight of the three and a temperature of 70°C, stir for 10 minutes and then heat to evaporate the water until the water content is 40%. Add talcum powder and heavy calcium to it, and mix evenly to obtain the product.

The above is the basic implementation of the present embodiment, further improvements, optimizations and limitations can be made on the basis of the above:

For example, cooling and grinding the composite powder after sintering refers to rapid cooling at a cooling rate of 600°C/min and then mixing with sepiolite wool and grinding until the particle size does not exceed 325 mesh;

As another example, hydroxyethyl cellulose with 1 times the weight of alumina micropowder and silica micropowder with 20% of the weight of alumina micropowder can also be added in the binding agent;

As another example, modified diatomite of 6% by weight of talcum powder can also be added to the base material. The preparation method of the modified diatomite is: firstly take methacrylic acid in a ratio of 10:4:25 by weight Methyl ester, ethyl cellulose and KH560 are mixed uniformly to form a mixed solution, then commercially available diatomaceous earth is mixed with a 7% mixed solution by weight, and then obtained by ultrasonic treatment with a frequency of 250KHz for 2 minutes;

For another example, 8% hydroxypropyl methylcellulose type putty rubber powder of talcum powder weight and 4% modified starch of talc powder weight can also be added in the base material, and the preparation method of the modified starch is as follows: Starch is added to water 3 times its weight and mixed evenly, then 8% of starch weight tin coupling agent is added thereto and the pH value is adjusted to 4 with sulfuric acid, then eucommia extract of 1% starch weight is added thereto, after mixing evenly Adjust the temperature to 60°C and keep it warm for 2 hours, and finally add stearic acid with 4% starch weight to it, stir evenly, and dry at 100°C to constant weight to obtain modified starch; the Eucommia ulmoides extract is Eucommia leaves After boiling in water for 20 minutes, filter out the filtrate obtained from the solid residue and evaporate to dryness to obtain the final powder;

Further, when the Eucommia extract is prepared, the leaves of Eucommia are firstly treated as follows:

1) After cleaning the leaves of Eucommia ulmoides with water, soak them in a sodium chloride solution with a mass concentration of 30% for 2 hours, then take them out and soak them in a sodium hydroxide solution with a mass concentration of 35% for 20 minutes, then take them out and rinse them with clean water ;

Among them, after soaking Eucommia leaves in sodium hydroxide solution for 10 minutes, microwave treatment with a power of 400W was applied to the solution for 2 minutes;

2) Soak the Eucommia leaves rinsed with clean water in step 1) in clear water 3 times its weight, then add cellulase at 1% of the Eucommia leaves weight therein, and let stand for 3 hours, then remove the Eucommia leaves and rinse with clean water After cleaning, the treatment of Eucommia leaves is completed;

Yet another example, the preparation method of described composite epoxy resin comprises the following steps:

1) Prepare modified silica sol for subsequent use;

The modified silica sol is obtained by sequentially adding 2% silica sol weight silica powder, 0.8% silica sol weight sodium acetate and 3% silica sol KH560 to commercially available silica sol, and then stirring at 70°C for 1 hour. mixture;

2) Take each component according to the stated ratio, then melt the bisphenol A type epoxy resin, add the weighed butylene epoxy resin, glycerin epoxy resin and diisocyanate to it successively, stir until completely After melting, the temperature was lowered to 60° C., and then the modified silica sol prepared in step 1) was added therein, and the composite epoxy resin was obtained after stirring evenly.

Finally, the base material can also be added with 6% lime grass pulp and 0.5% lime calcium powder; Clean and squeeze the stems to obtain the scorpion grass cake and juice. The powder obtained by evaporating the juice to dryness is the scorpion grass powder. Soak the scorpion grass cake in a sodium hydroxide solution with a mass concentration of 30% for 24 hours, and then remove it It is mixed with water three times the weight of the straw cake, calcium oxide with 60% of the weight of the cake, and glass fiber with 40% of the weight of the cake, and then pulverized to obtain the straw pulp.

Example 2

A water-resistant putty for interior walls is formed by mixing base material and 10% of its weight water-resistant additive according to the weight ratio, and the base material is made of talcum powder, heavy calcium, gray calcium and wood cellulose in a ratio of 28:18:16 : a weight ratio of 3 is mixed, and the water-resistant additive is mixed by composite powder, a binder of 30% of the composite powder weight and a composite epoxy resin of 15% of the composite powder weight, wherein the composite powder is silicon carbide, carbon powder Mix with aluminum hydroxide in a weight ratio of 6:3:2, sinter at 1600°C for 5 hours, cool, mix with sepiolite wool with 20% weight of silicon carbide, and grind to obtain a particle size of no more than 325 mesh. powder; the binder is obtained by mixing alumina micropowder, modified nano-silica, polyethylene glycol and water in a weight ratio of 11:7:24:36 and then evaporating the liquid at 120°C; the modified Nano silica is commercially available nano silica, benzoic acid, acetone and KH560 mixed according to the ratio of 800:5:3:40 by weight; the composite epoxy resin consists of 4 parts of bisphenol A type epoxy resin, 0.5 parts of butylene epoxy resin, 0.5 parts of glycerin epoxy resin, 2 parts of diisocyanate and 2 parts of modified silica sol, which are added in sequence in commercially available silica sol Silica sol weight 3% silica powder, silica sol weight 1% sodium acetate and silica sol weight 4% KH560, and then stir the mixture obtained at 80°C for 2h;

The preparation method of the above-mentioned water-resistant putty for interior walls is as follows: firstly prepare composite powder, binder and composite epoxy resin respectively and mix them in proportion to obtain water-resistant additives, then weigh talcum powder, heavy calcium, gray calcium, wood Cellulose and water-resistant additives, then mix ash calcium, lignocellulose and water-resistant additives and add hot water with a temperature of 80°C that is 10 times the total weight of the three, stir for 20 minutes, then heat to evaporate the water until the water content is 40%, and finally Add talcum powder and heavy calcium to it, and mix evenly to obtain the product.

The above is the basic implementation of the present embodiment, further improvements, optimizations and limitations can be made on the basis of the above:

For example, cooling and grinding the composite powder after sintering refers to rapid cooling at a cooling rate of 700°C/min and then mixing with sepiolite wool and grinding until the particle size does not exceed 325 mesh;

As another example, 1.2 times the weight of alumina micropowder and 30% silica micropowder of alumina micropowder weight can also be added in the binding agent;

As another example, modified diatomite with 10% by weight of talcum powder can also be added to the base material. The preparation method of the modified diatomite is as follows: firstly take methacrylic acid in a ratio of 10:4:25 by weight Mix methyl ester, ethyl cellulose and KH560 evenly to form a mixed solution, then take commercially available diatomaceous earth and mix it with 8% by weight of the mixed solution, and use ultrasonic treatment with a frequency of 270KHz for 3 minutes to obtain it;

For another example, the base material can also add 10% hydroxypropyl methylcellulose type putty rubber powder of talcum powder weight and 6% modified starch of talc powder weight, and the preparation method of the modified starch is as follows: Starch was added to water 5 times its weight and mixed evenly, then 10% of the weight of starch was added as a tin coupling agent and the pH value was adjusted to 5 with sulfuric acid, and eucommia extract of 3% of the weight of starch was added thereto, after mixing evenly Adjust the temperature to 65°C and keep it warm for 3 hours, finally add stearic acid with 5% starch weight to it, stir evenly, and dry at 110°C to constant weight to obtain modified starch; the Eucommia ulmoides extract is Eucommia leaves After boiling in water for 30 minutes, filter the filtrate obtained from the solid residue and evaporate to dryness to obtain the final powder;

Further, when the Eucommia extract is prepared, the leaves of Eucommia are firstly treated as follows:

1) After cleaning the leaves of Eucommia ulmoides with water, soak them in a sodium chloride solution with a mass concentration of 30% for 2 hours, then take them out and soak them in a sodium hydroxide solution with a mass concentration of 35% for 20 minutes, then take them out and rinse them with clean water ;

Among them, after soaking Eucommia leaves in sodium hydroxide solution for 10 minutes, microwave treatment with a power of 400W was applied to the solution for 2 minutes;

2) Soak the eucommia leaves rinsed with clean water in step 1) in clear water 5 times its weight, then add 1% cellulase of the eucommia leaves weight therein, and let stand for 4 hours, then remove the eucommia leaves and rinse with clean water After cleaning, the treatment of Eucommia leaves is completed;

Yet another example, the preparation method of described composite epoxy resin comprises the following steps:

1) Prepare modified silica sol for subsequent use;

The modified silica sol is obtained by sequentially adding 3% silica sol weight silica powder, 1% silica sol weight sodium acetate and 4% silica sol KH560 to commercially available silica sol, and then stirring at 80°C for 2h. mixture;

2) Take each component according to the stated ratio, then melt the bisphenol A type epoxy resin, add the weighed butylene epoxy resin, glycerin epoxy resin and diisocyanate to it successively, stir until completely After melting, the temperature was lowered to 70° C., and then the modified silica sol prepared in step 1) was added therein, and the composite epoxy resin was obtained after stirring evenly.

Finally, the base material can also be added with 8% limestone pulp and 0.5% gray calcium powder; Clean and squeeze the stalks to obtain the scorpion grass cake and juice, and the powder obtained by steaming the juice to dryness is the scorpion grass powder. Soak the scorpion grass cake in a sodium hydroxide solution with a mass concentration of 30% for 28 hours, remove it and then Mix it with water 4 times the weight of the straw cake, calcium oxide with 60% of the weight of the cake, and glass fiber with 40% of the weight of the cake, and then grind to obtain the straw pulp.

Example 3

A kind of water-resistant putty for interior walls is formed by mixing base material and 7% of its weight water-resistant additive according to the weight ratio, and the base material is composed of talcum powder, heavy calcium, gray calcium and lignocellulose in a ratio of 26:15:15 : the weight ratio of 2.5 is mixed, and described water-resistant additive is mixed by composite powder, the binding agent of composite powder weight 25% and the composite epoxy resin of composite powder weight 12.5%, wherein, composite powder is silicon carbide, carbon powder Mix it with aluminum hydroxide at a weight ratio of 5.5:2.5:1.5, sinter at 1600°C for 4.5 hours, cool, mix with sepiolite wool with 15% by weight of silicon carbide, and grind to obtain a particle size of no more than 325 mesh Mixed powder; the binder is obtained by mixing alumina micropowder, modified nano-silica, polyethylene glycol and water in a weight ratio of 10:6:22:33 and then evaporating the liquid at 110°C; the modified Nano silica is commercially available nano silica, benzoic acid, acetone and KH560 mixed according to the ratio of 700:4.5:2.5:40 by weight; the composite epoxy resin consists of 4 parts of bisphenol A ring Oxygen resin, 0.5 part of butylene epoxy resin, 0.5 part of glycerin epoxy resin, 2 parts of diisocyanate and 2 parts of modified silica sol, which are sequentially prepared in commercially available silica sol Add 2.5% silica sol weight silica powder, 0.9% silica sol weight sodium acetate and 3.5% silica sol weight KH560, and then stir the resulting mixture at 75°C for 1.5h;

The preparation method of the above-mentioned water-resistant putty for interior walls is as follows: firstly prepare composite powder, binder and composite epoxy resin respectively and mix them in proportion to obtain water-resistant additives, then weigh talcum powder, heavy calcium, gray calcium, wood Cellulose and water-resistant additives, then mix ash calcium, lignocellulose and water-resistant additives, add 9 times the total weight of the three and hot water at a temperature of 75°C, stir for 15 minutes, then heat to evaporate the water until the water content is 40%, and finally Add talcum powder and heavy calcium to it, and mix evenly to obtain the product.

The above is the basic implementation of the present embodiment, further improvements, optimizations and limitations can be made on the basis of the above:

For example, cooling and grinding the composite powder after sintering refers to rapid cooling at a cooling rate of 650°C/min and then mixing with sepiolite wool and grinding until the particle size does not exceed 325 mesh;

As another example, 1.1 times the weight of alumina micropowder and 25% silica micropowder of alumina micropowder weight can also be added in the binding agent;

As another example, modified diatomite with 8% weight of talcum powder can also be added to the base material. The preparation method of the modified diatomite is as follows: first take methacrylic acid in a ratio of 10:4:25 by weight Mix methyl ester, ethyl cellulose and KH560 evenly to form a mixed solution, then take commercially available diatomaceous earth and mix it with a 7.5% mixed solution by weight, and use ultrasonic treatment with a frequency of 260KHz for 2.5 minutes to obtain it;

For another example, the base material can also add 9% hydroxypropyl methylcellulose type putty rubber powder of talcum powder weight and 5% modified starch of talc powder weight, and the preparation method of the modified starch is as follows: Starch is added to water that is 4 times its weight and mixed evenly, then 9% of the weight of starch is added to the tin coupling agent and the pH value is adjusted to 4.5 with sulfuric acid, and then eucommia extract of 2% of the weight of starch is added to it, and after mixing evenly Adjust the temperature to 63°C and keep it warm for 2.5h, finally add stearic acid with 4.5% starch weight to it, stir evenly, and dry at 105°C to constant weight to obtain modified starch; the Eucommia ulmoides extract is Eucommia After the leaves are boiled in water for 25 minutes, the filtrate obtained by filtering out the solid residue is evaporated to dryness to obtain the final powder;

Further, when the Eucommia extract is prepared, the leaves of Eucommia are firstly treated as follows:

1) After cleaning the leaves of Eucommia ulmoides with water, soak them in a sodium chloride solution with a mass concentration of 30% for 2 hours, then take them out and soak them in a sodium hydroxide solution with a mass concentration of 35% for 20 minutes, then take them out and rinse them with clean water ;

Among them, after soaking Eucommia leaves in sodium hydroxide solution for 10 minutes, microwave treatment with a power of 400W was applied to the solution for 2 minutes;

2) Soak the eucommia leaves rinsed with clean water in step 1) in clear water 4 times its weight, then add 1% cellulase of eucommia leaves weight therein, and let stand for 3.5 hours, then remove the eucommia leaves and use After cleaning with clear water, the treatment of Eucommia leaves is completed;

Yet another example, the preparation method of described composite epoxy resin comprises the following steps:

1) Prepare modified silica sol for subsequent use;

The modified silica sol is to sequentially add 2.5% silica sol weight silica powder, 0.9% silica sol weight sodium acetate and 3.5% silica sol weight KH560 to the commercially available silica sol, and then stir at 75°C for 1.5h the resulting mixture;

2) Take each component according to the stated ratio, then melt the bisphenol A type epoxy resin, add the weighed butylene epoxy resin, glycerin epoxy resin and diisocyanate to it successively, stir until completely After melting, the temperature was lowered to 65° C., and then the modified silica sol prepared in step 1) was added therein, and the composite epoxy resin was obtained after stirring evenly.

Finally, the base material can also be added with 7% lime grass pulp and 0.5% lime calcium powder; Clean and squeeze the stalks to obtain the scorpion grass cake and juice, and the powder obtained by steaming the juice to dryness is the scorpion grass powder. Soak the scorpion grass cake in a sodium hydroxide solution with a mass concentration of 30% for 26 hours, and then remove it Mix it with water 3.5 times the weight of the straw cake, calcium oxide with 60% of the weight of the cake, and glass fiber with 40% of the weight of the cake, and then grind to obtain the straw pulp.

Water resistance test

The test is carried out with the water resistance specified in Article 6.11 of the construction industry standard JG/T298-2010 of the People's Republic of China for building interior putty:

Carry out in accordance with the provisions of GB/T1733, soak in the third-grade water specified in GB/T6682, take it out and observe whether there is foaming or cracking, dry it for 24 hours under the test environment specified in 6.2 of this standard, rub lightly with your fingers to observe whether there is obvious peeling If there is no foaming, cracking and no obvious powder falling on two of the three test panels, it is considered "no foaming, cracking and obvious powder falling":

First, prepare samples with the following formulas, and prepare five samples for each formula. The formulas of the samples are as follows:

Formula 1: According to the weight ratio, the putty is made by mixing 26 parts of talcum powder, 15 parts of heavy calcium, 15 parts of gray calcium, and 3 parts of lignocellulose;

Formula 2: The putty is made by mixing the base material and 7% water-resistant additive by weight of the base material. According to the weight ratio, the base material consists of 26 parts of talcum powder, 15 parts of heavy calcium, 15 parts of gray calcium, and 3 parts of wood fiber Composition, water-resistant additive composite powder, composite powder weight 25% binder and composite powder weight 15% composite epoxy resin are mixed, composite powder is silicon carbide, carbon powder and aluminum hydroxide according to weight ratio 5: 2: 1, sintered at 1600°C for 4 hours, cooled, mixed with sepiolite wool with a weight of 10% of silicon carbide, and then ground to obtain a mixed powder with a particle size of no more than 325 meshes; the binder is composed of alumina micropowder, Modified nano-silica, polyethylene glycol and water are mixed in a weight ratio of 9:5:22:34 and evaporated to dryness at 110°C; the composite epoxy resin consists of 4 parts of bisphenol A epoxy resin , 0.5 parts of butylene epoxy resin, 0.5 parts of glycerol epoxy resin, 2 parts of diisocyanate and 2 parts of modified silica sol;

Formula 3: On the basis of formula 2, additionally add 1.2 times the weight of alumina fine powder hydroxyethyl cellulose and 30% of the weight of alumina fine powder silicon fine powder to the binder;

Formula 4: On the basis of formula 2, add modified diatomite with 8% weight of talcum powder in the base material. The preparation method of modified diatomite is: first take Mix methyl methacrylate, ethyl cellulose and KH560 uniformly to form a mixed solution, then take commercially available diatomaceous earth and mix it with a 7% mixed solution by weight, and use ultrasonic treatment with a frequency of 250KHz for 3 minutes to obtain it;

Formula 5: On the basis of formula 2, additionally add 10% talcum powder weight hydroxypropyl methylcellulose type putty rubber powder and talc powder weight 6% modified starch to the base material, the preparation method of modified starch As shown in embodiment 1;

Recipe 6: On the basis of formula 2, in the base material, additionally add scorpion grass pulp with 8% lime calcium weight and 0.5% lime grass powder with lime calcium weight; As shown in example 1;

Carry out in accordance with the provisions of GB/T1733, soak in the third-grade water specified in GB/T6682, take it out and observe whether there is foaming or cracking, dry it for 24 hours under the test environment specified in 6.2 of this standard, rub lightly with your fingers to observe whether there is obvious peeling If there is no foaming, cracking and no obvious powder falling on two of the three test panels, it is considered "no foaming, cracking and obvious powder falling";

test results:

Formula 1: When soaking for about 42 hours, a group of samples of formula 1 began to foam. When the soaking time was about 52 hours, three groups of samples showed foaming. When soaking continued for about 58 hours, all foaming appeared;

Formula 2: After soaking for about 51 hours, formula 2 began to foam. When the soaking time was about 65 hours, three groups of samples showed foaming. When soaking continued for about 77 hours, all foaming appeared;

Formula 3: After soaking for about 53 hours, formula 3 began to foam. When the soaking time was about 76 hours, three groups of samples showed foaming. When soaking continued for about 85 hours, all foaming appeared;

Formula 4: When soaking for 49 hours, a group of samples of formula 4 began to foam. When the soaking time was 72 hours, foaming appeared in the three groups of samples. When soaking continued for 81 hours, all foaming appeared;

Formula 5: When soaking for 57 hours, a group of samples of formula 5 began to foam. When the soaking time was 68 hours, foaming appeared in the three groups of samples. When soaking continued to 77 hours, all foaming appeared;

Formula 6: When soaking for 55 hours, a group of samples of formula 6 began to foam. When the soaking time was 71 hours, foaming appeared in the three groups of samples. When soaking continued for 89 hours, all foaming appeared;

From the above experimental results, it can be seen that after adding water-resistant additives, the water-resistant performance of the putty powder can be significantly improved (the soaking time of formula 2 is much longer than that of formula 1), and hydroxyethyl cellulose and silicon are added to the binder. Micro-powder can further enhance its water resistance (the soaking time of formula 3 is longer than that of formula 1 and formula 2), and adding modified diatomaceous earth to the base material can also improve the water resistance of putty powder to a certain extent ( The soaking time of formula 4 is greater than the soaking time of formula 1 and formula 2), by adding hydroxypropyl methylcellulose type putty rubber powder and modified starch in base material, the water resistance of putty powder can also be improved (prescription 5 The soaking time is greater than that of formula 1 and formula 2), and finally, adding scorpion grass pulp and scorpion grass powder to the base material can also improve the water resistance of the putty powder (the soaking time of formula 6 is longer than that of formula 1 and formula 2 time).

Claims (8)

1. A water-resistant putty for interior walls is formed by mixing base material and 4-10% of its weight water-resistant additive according to the weight ratio, and the base material is composed of talcum powder, heavy calcium, gray calcium and wood cellulose in 24 - 28: 12-18: 14-16: 2-3 weight ratio mixed, characterized in that: the water-resistant additive is composed of composite powder, a binder with a weight of 20-30% of the weight of the composite powder and a weight of 10-15% of the weight of the composite powder % of composite epoxy resin, wherein the composite powder is silicon carbide, carbon powder and aluminum hydroxide mixed in a weight ratio of 5-6:2-3:1-2 and sintered at 1600°C for 4- Cool after 5 hours and mix with sepiolite wool with a weight of 10-20% of silicon carbide and grind to obtain a mixed powder with a particle size of no more than 325 mesh; the binder consists of alumina micropowder, modified nano-silica, polyethylene Glycol and water are mixed according to the weight ratio of 9-11: 5-7: 20-24: 30-36 and obtained by evaporating the liquid at 100-120°C; the modified nano-silica is commercially available nano-silica Silicon, benzoic acid, acetone and KH560 are mixed according to the ratio of 600-800:4-5:2-3:40 by weight; the composite epoxy resin consists of 4 parts of bisphenol A epoxy resin, 0.5 part Butylene epoxy resin, 0.5 part of glycerin epoxy resin, 2 parts of diisocyanate and 2 parts of modified silica sol are made, and described modified silica sol is to add silica sol weight 2 in succession in commercially available silica sol - 3% microsilica powder, 0.8-1% sodium acetate by weight of silica sol and KH560 by 3-4% by weight of silica sol, and then stir the obtained mixture at 70-80°C for 1-2h. 2. A kind of water-resistant putty for interior walls according to claim 1, characterized in that: the composite powder is cooled after sintering, and powder grinding refers to rapid cooling at a cooling rate of 600-700° C./min and then Mix and grind with sepiolite wool until the particle size does not exceed 325 mesh. 3. A kind of water-resistant putty for interior walls according to claim 1, characterized in that: said binding agent also contains hydroxyethyl cellulose and alumina micropowder weight 20-1.2 times the weight of alumina micropowder. 30% microsilica. 4. A kind of water-resistant putty for interior wall according to claim 1, characterized in that: the modified diatomite containing talcum powder weight 6-10% in the base material, the modified diatomite The preparation method is as follows: firstly take methyl methacrylate, ethyl cellulose and KH560 in a weight ratio of 10:4:25 and mix them evenly to form a mixed solution, then take commercially available diatomite and a mixed solution with 7-8% of its weight It is obtained by mixing and ultrasonic treatment with a frequency of 250-270KHz for 2-3 minutes. 5. A kind of water-resistant putty for interior walls according to claim 1, characterized in that: the base material contains hydroxypropyl methylcellulose type putty rubber powder and talcum powder of 8-10% by weight of talcum powder 4-6% by weight of modified starch, the preparation method of the modified starch is that starch is added to water 3-5 times its weight and mixed evenly, and then 8%-10% of the weight of starch is added to it. Combine the agent and adjust the pH value to 4-5 with sulfuric acid, then add eucommia extract with 1-3% starch weight to it, mix evenly, adjust the temperature to 60-65°C and keep it warm for 2-3h, and finally add starch weight 4% to it -5% stearic acid, stir evenly and dry at 100-110°C to constant weight to obtain modified starch; the Eucommia extract is obtained by boiling the leaves of Eucommia in water for 20-30min and then filtering off the solid residue The filtrate was evaporated to dryness to finally obtain a powder. 6. A kind of water-resistant putty for interior walls according to claim 5, characterized in that: when the Eucommia extract is prepared, the leaves of Eucommia are first treated as follows: 1) After cleaning the leaves of Eucommia ulmoides with water, soak them in a sodium chloride solution with a mass concentration of 30% for 2 hours, then take them out and soak them in a sodium hydroxide solution with a mass concentration of 35% for 20 minutes, then take them out and rinse them with clean water ; Among them, after soaking Eucommia leaves in sodium hydroxide solution for 10 minutes, microwave treatment with a power of 400W was applied to the solution for 2 minutes; 2) Soak the eucommia leaves rinsed with clear water in step 1) in clear water 3-5 times its weight, then add cellulase at 1% of the weight of eucommia leaves, and let it stand for 3-4 hours, then remove the eucommia leaves After it comes out, wash it with clear water to complete the treatment of the leaves of Eucommia ulmoides. 7. a kind of water-resistant putty for interior wall according to claim 1, is characterized in that: the preparation method of described composite epoxy resin comprises the following steps: 1) Prepare modified silica sol for subsequent use; The modified silica sol is to add successively into the commercially available silica sol the silica micropowder of 2-3% of the silica sol weight, the sodium acetate of 0.8-1% of the silica sol weight and the KH560 of 3-4% of the silica sol weight, and then at 70 Stir the resulting mixture at -80°C for 1-2h; 2) take each component according to the ratio described in claim 1, after bisphenol A type epoxy resin is melted then, add butene epoxy resin, glycerol epoxy resin and diisocyanate successively wherein, After stirring until completely melted, the temperature is lowered to 60-70° C., and then the modified silica sol prepared in step 1) is added thereto, and the composite epoxy resin is obtained after stirring evenly. 8. A kind of water-resistant putty for interior walls according to claim 1, characterized in that: the base material is also added with 6-8% lime grass pulp and 0.5% lime grass weight powder; the preparation method of the described scorpion grass pulp and scorpion grass powder is: get the leaves and stems of the tender scorpion grass to clean and squeeze to obtain the scorpion grass cake and juice, and the powder obtained by evaporating the juice is the scorpion grass powder. Soak the strawberry cake in a sodium hydroxide solution with a mass concentration of 30% for 24-28 hours, and then mix it with water 3-4 times the weight of the strawberry cake, calcium oxide with 60% weight of the strawberry cake, and The glass fiber with 40% of the weight of the cake is mixed and refined to obtain the scorpion grass pulp.