JPS6016855A - Plaster composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plaster composition suitable for use as a plaster for walls and for repairing roofs of buildings and various other places.

Conventionally, plaster is usually mixed with water at a construction site, but cranks are likely to occur in the construction area where such plaster is applied, although small, over the entire construction area.

As a result of continuing various studies from the viewpoint of preventing the above-mentioned cracks, the inventors of the present invention discovered that cracks can be prevented by adding a synthetic rubber emulsion to stucco.

That is, the present invention was made based on the above findings, and includes a kneaded product of slaked lime, aggregate, inorganic fiber, synthetic sizing agent, and water.
The present invention provides a plaster composition characterized by containing a synthetic rubber emulsion.

The plaster composition of the present invention will be explained in more detail below.

First, the aggregate that is a component of the plaster composition of the present invention is the same as that used for conventional plaster, and usually one or more of silica powder, silica sand, and cold water is used for its purpose. It is used at a mixing ratio according to the

Moreover, as the inorganic fiber, glass fiber is usually suitably used.

Furthermore, as the synthetic glue, methylcellulose-based glue, vinyl acetate-based glue, etc. are preferably used.

In addition, the synthetic rubber emulsion prevents the occurrence of cracks (cracks) in the construction area where the plaster composition of the present invention is applied or filled, and also makes the construction area white after drying to give it a beautiful appearance. It is included for the purpose of improving the adhesion of the above-mentioned line plaster composition to materials, etc., and further reducing dandruff and efflorescence, and as the synthetic rubber emulsion, acrylonitrile rubber, SBR, etc. are preferably used. . Examples of the acrylonitrile rubber include Molcook Vetolock (manufactured by Fuikasei Co., Ltd.), and examples of SBR include Tomasoku Super (manufactured by Japan Synthetic Rubber Co., Ltd.).

Therefore, the plaster composition of the present invention contains slaked lime, aggregate,
A synthetic rubber emulsion is added to a kneaded mixture of inorganic fibers, a synthetic sizing agent, and water.The synthetic rubber emulsion has a solid content of 30 to 70% by weight, and the synthetic rubber emulsion is composed of It is preferable that the total amount is 1 to 5% by weight. When the content of the synthetic rubber emulsion is below this range, it is difficult to obtain the effect of adding the synthetic rubber emulsion, and when the content of the synthetic rubber emulsion is above this range, it is unfavorable in terms of workability and other aspects. Further, the preferred content of the synthetic rubber emulsion in the plaster composition of the present invention is 7 to 15 parts by weight per 100 parts by weight of water.

In addition, the preferred proportions of slaked lime, aggregate and water in the kneaded material are 30 to 50 parts by weight of slaked lime, 70 to 150 parts by weight of aggregate, and 40 to 80 parts by weight of water. It becomes difficult to obtain a plaster composition.

Further, it is preferable that the amount of inorganic fiber used in the kneaded product in the above-mentioned preferred ratio is 0.05 to 1.5 parts by weight, and the amount of synthetic sizing agent used is 0.1 to 2.5 parts by weight. Further, it is preferable that more inorganic fibers and synthetic glue be blended in the plaster for putty than in the plaster for walls.

In addition to the above, dispersants, thickeners, brighteners, and the like can be appropriately added to the plaster composition of the present invention as optional components.

The plaster composition of the present invention having such a composition is
It is used as wall plaster and repair plaster for roofs of buildings and various other places in the same way as conventional wall plaster or repair plaster.

The plaster composition of the present invention can be manufactured in a factory and sold and used as is.
At the time of use (construction), each component of the plaster composition of the present invention may be blended.

EXAMPLES The plaster composition of the present invention will be described in more detail below with reference to Examples and Comparative Examples, but it goes without saying that the present invention is not limited to these Examples.

”-Example”! : [In addition, the components shown in Table 1 below were kneaded to prepare No. 1 to No. 6 kneaded plaster compositions (Comparative Examples 1 to 6) and No. 7 to No. 10 kneaded plaster compositions (Execution). Examples 1 to 4) were obtained.

Obtained No. 1 to No. 6 kneaded plaster and interval 7 to
In order to check the presence or absence of cranks after construction with the N010 mixed plaster composition, these were applied once to a concrete panel measuring 30 am long, 2 Q cm wide, and 10 thick to a thickness of 9i+u (however, in the middle of the peripheral edge) In the 2 to 3-sided part, the thickness is 0 at the outer peripheral edge of the concrete panel.
The coating thickness was gradually reduced to 1), and after being left for 24 hours, the presence or absence of cranks was examined. The results are shown in Table 1.

Table 1 As is clear from Table 1, cranks occurred in the mixed plasters of Comparative Examples 1 to 6 (No. 1 to 6) that did not contain synthetic rubber emulsion, but those that contained synthetic rubber emulsion Examples 1 to 4 of the present invention (No. 7 to No. 10)
) No cracks occurred in the plaster composition.

The appearance of cranks in the mixed plaster of Comparative Examples 1 to 6 (Dimensions 1 to 6) is almost the same, and a plurality of thick long and short cracks are formed from the peripheral edge or the vicinity thereof toward the center. In addition, multiple long and short cracks were formed in the center. Also, the reason why the plaster was applied once thickly was to make it easier for cracks to occur.

Moreover, Examples 1 to 4. In order to investigate whether or not the mixed plaster compositions (No. 7 to Floor 10) would cause cranking under even more severe conditions, the putty-like mixed plaster composition No. 8 was filled into the joints of the block wall. Then, paste No. 1 is applied to the plaster composition and the surface of the block wall.
When I tried applying a plaster composition of 10, 30
Even after a day has passed, it still feels dull.

No damage occurred.

On the other hand, for this experiment, the construction conditions were made harsher. That is, the block wall was not sprayed with water, which is usually done, but instead the dry block wall absorbed water from the mixed plaster composition to increase the drying rate and make cracks more likely to occur. However, even under such severe conditions, no cracks were generated as described above, and on the contrary, the adhesion to the block wall was good.

In addition, for this experiment, No. 8 and No. 10
The mixed plaster composition of No. 8 was used because it was easier to apply than the mixed plaster composition of No. 8, and the mixed plaster composition of No. 10 was easier to apply than No. 9.

Practical plaster compositions I and I were obtained by kneading the components shown in Table 2 below.

The obtained plaster composition I can be used as a plaster for walls, and when it was applied to a concrete panel in the same manner as in Examples 1 to 4 and the results were examined, it was found that no cracks were generated at all.

In addition, the obtained plaster composition (2) can be used as a putty plaster, and when it was filled into the joints of a block wall in the same manner as in Example 2 and the results were examined, it was found that it did not cause any cranking. Ta.

Table 2 *Using Tomasoku Super As mentioned above, the kneaded plaster composition of the present invention contains a synthetic rubber emulsion, and the synthetic rubber emulsion does not break down over a long period of time even in strong alkali mixtures. In combination, the plaster composition of the present invention can be shipped in the form of a plaster, and due to its moderate hydrophilicity and elasticity, it can prevent cracks in construction areas coated or filled with the plaster composition of the present invention. It is possible to prevent the occurrence of dandruff and efflorescence, and it is also possible to whiten the applied area after drying to give it a beautiful appearance.It is also possible to improve the adhesion to the base material, etc., and to prevent dandruff and efflorescence. This has great effects such as being able to reduce the amount of water used.

Patent applicant Tamio Yamane

Claims (3)

[Claims] (1) A kneaded plaster composition characterized by containing a synthetic rubber emulsion in a kneaded mixture of slaked lime, aggregate, inorganic fibers, synthetic glue, and water. (2) Synthetic rubber emulsion has a solid content concentration of 30 to 70
% by weight, and the synthetic rubber emulsion is 1 to 5% by weight.
The plaster composition according to claim (1), which contains: (3) Claim No. 2, wherein the content of the synthetic rubber emulsion is 7 to 15 parts by weight per 100 parts by weight of water.
The plaster composition described in Section. (4) The ratio of slaked lime, aggregate and water in the kneaded product is 30 to 50 parts by weight of slaked lime, 70 to 150 parts by weight of aggregate, and 40 to 80 parts by weight of water. Composition.