CN103937091A - Flame retardation enhanced polypropylene composition and preparation method thereof - Google Patents

Abstract

The invention discloses a flame-retardant reinforced polypropylene composition, which comprises the following components by weight percentage: 5-15% copolymerized polypropylene; 50-70% homo-polypropylene; 15-35% flame retardant; 7 ~20% glass fiber; wherein, the flame retardant is a compound of decabromodiphenylethane and magnesium hydroxide, and the compounding ratio is 2:1~4:1 by weight percentage, and its preparation method: a) Mix the copolymerized polypropylene and the homopolypropylene on a double-roller mixer at 175-185°C to obtain a molten polypropylene premix; b) Preheat the glass fiber and flame retardant to 185-200°C ; c) Mix the preheated glass fiber and the molten polypropylene premix evenly to obtain a blend; d) Add the preheated flame retardant to the blend, and mix it on a double-roller mixer at 175 Mixing at -185°C, ready to be obtained; the flame retardant reinforced polypropylene composition of the present invention uses a flame retardant compounded with decabromodiphenylethane and magnesium hydroxide, which has low toxicity and good environmental protection effect, and plays a synergistic flame retardant The effect, the oxygen index is greater than 30%, and the flame retardant grade can reach UL94V-1.

Description

A flame-retardant reinforced polypropylene composition and its preparation method

technical field

The invention relates to the field of polymer materials, in particular to a flame-retardant reinforced polypropylene composition and a preparation method thereof.

Background technique

At present, with the improvement of polypropylene production process and the improvement of polymerization process, great progress has been made in the development and application of high fluidity polypropylene products; polypropylene products have been widely used in packaging, transportation, home appliances, automobiles, offices and other fields application.

However, polypropylene is an extremely flammable product. At present, it is a mature technology to compound flame-retardant polypropylene with halogen and antimony compounds, but it cannot meet environmental protection requirements, and the cost is high and the preparation process is complicated.

Therefore, it is very important to develop a flame-retardant polypropylene composition that can meet environmental protection requirements, and whose flame-retardant grade can reach UL94V-1 and has high strength.

Contents of the invention

In order to overcome the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a flame-retardant reinforced polypropylene composition with environmental protection, high strength, oxygen index greater than 30%, and flame-retardant grade up to UL94V-1.

Another object of the present invention is to provide a preparation method of the above-mentioned flame-retardant reinforced polypropylene composition.

The present invention is achieved through the following technical solutions:

A flame-retardant reinforced polypropylene composition, by weight percentage, comprises the following components:

Copolymerized polypropylene 5~15%;

Homopolypropylene 50~70%;

Flame retardant 15~35%;

Glass fiber 7~20%;

Wherein, the flame retardant is a compound of decabromodiphenylethane and magnesium hydroxide, and the ratio of decabromodiphenylethane to magnesium hydroxide is in the range of 2:1 to 4:1 by weight percentage.

When the ratio of decabromodiphenylethane to magnesium hydroxide is less than 2:1 or greater than 4:1, the synergistic flame retardant effect cannot be achieved.

The melt flow rate of the polypropylene copolymer is 8-9.4g/min, and the melt flow rate is determined according to GB/T 3682-2000 Thermoplastic Melt Mass Flow Rate and Melt Volume Flow Rate Measurement Method .

The glass fiber has a diameter of 15-25um and a length of 0.3-0.6mm.

A preparation method for a flame-retardant reinforced polypropylene composition, comprising the steps of:

a) mixing the copolymerized polypropylene and the homopolypropylene on a two-roller mixer at 175-185°C to obtain a molten polypropylene premix;

b) Preheat glass fiber and flame retardant to 185-200°C respectively;

c) uniformly mixing the preheated glass fibers with the molten polypropylene premix obtained in step a) to obtain a blend;

d) adding the preheated flame retardant to the blend obtained in step c), and kneading on a two-roll mixer at 175-185° C. to obtain a flame retardant reinforced polypropylene composition.

Compared with the prior art, the present invention has the following beneficial effects:

1) The flame-retardant reinforced polypropylene composition of the present invention is reinforced with glass fibers that are not combustible itself, which can achieve high strength and synergistic flame-retardant effects.

2) The flame retardant reinforced polypropylene composition of the present invention uses a flame retardant compounded with decabromodiphenylethane and magnesium hydroxide, which has low toxicity and good environmental protection effect.

3) The flame retardant reinforced polypropylene composition of the present invention uses a flame retardant compounded with decabromodiphenylethane and magnesium hydroxide, which has a good synergistic flame retardant effect, the oxygen index can be greater than 30%, and the flame retardant grade Can reach UL94V-1.

Detailed ways

The present invention will be further described below through specific embodiments. The following examples are preferred implementation forms of the present invention, but the implementation manners of the present invention are not limited by the following examples.

In the following examples and comparative examples, the raw materials used are as follows:

Copolymerized polypropylene: Singapore TPC Company, the model is AW564;

Homopolypropylene: Yanshan Petrochemical, model K1008;

Decabromodiphenylethane: Albemarle, model 8010;

Magnesium hydroxide: "Magnesium Pa" brand PS-1191.

Embodiment 1~5: Preparation of flame retardant reinforced polypropylene composition

A kind of flame-retardant reinforced polypropylene composition, its raw material formula is as shown in table 1, and its preparation method comprises the steps: take copolymerized polypropylene, homopolypropylene, flame retardant and glass fiber by weight percentage, wherein, flame retardant The fuel is a compound of decabromodiphenylethane and magnesium hydroxide, and the ratio of decabromodiphenylethane to magnesium hydroxide is in the range of 2:1~4:1 by weight percentage; Polypropylene and homopolypropylene are kneaded at 175-185°C on a twin-roller mixer to obtain a molten polypropylene premix; preheat the weighed glass fiber and flame retardant to 185-200°C respectively; Mix the preheated glass fiber and the obtained molten polypropylene premix evenly to obtain a blend; add the preheated flame retardant to the obtained blend, and mix it at 175- Mixing was carried out at 185°C to obtain a flame-retardant reinforced polypropylene composition; its related properties were measured, and the specific data are listed in Table 1.

Comparative example 1:

A kind of flame-retardant reinforced polypropylene composition, its raw material formula is as shown in table 1, and its preparation method comprises the steps: take copolymerized polypropylene, homopolypropylene, flame retardant and glass fiber by weight percentage, wherein, flame retardant The fuel is a compound of decabromodiphenylethane and magnesium hydroxide, and the ratio of decabromodiphenylethane to magnesium hydroxide is 1:1 by weight percentage; Polypropylene is kneaded at 175-185°C on a double-roller mixer to obtain a molten polypropylene premix; preheat the weighed glass fiber and flame retardant to 185-200°C respectively; The glass fiber and the obtained molten polypropylene premix are uniformly mixed to obtain a blend; the preheated flame retardant is added to the obtained blend, and mixed on a double-roller mixer at 175-185°C Refining to obtain a flame-retardant reinforced polypropylene composition; determine its related properties, and the specific data are listed in Table 1.

Comparative example 2:

A kind of flame-retardant reinforced polypropylene composition, its raw material formula is as shown in table 1, and its preparation method comprises the steps: take copolymerized polypropylene, homopolypropylene, flame retardant and glass fiber by weight percentage, wherein, flame retardant The fuel is a compound of decabromodiphenylethane and magnesium hydroxide, and the ratio of decabromodiphenylethane to magnesium hydroxide is 6.5:1 by weight percentage; Polypropylene is kneaded at 175-185°C on a double-roller mixer to obtain a molten polypropylene premix; preheat the weighed glass fiber and flame retardant to 185-200°C respectively; The glass fiber and the obtained molten polypropylene premix are uniformly mixed to obtain a blend; the preheated flame retardant is added to the obtained blend, and mixed on a double-roller mixer at 175-185°C Refining to obtain a flame-retardant reinforced polypropylene composition; determine its related properties, and the specific data are listed in Table 1.

Comparative example 3:

A kind of flame-retardant reinforced polypropylene composition, its raw material formula is as shown in table 1, and its preparation method comprises the steps: take copolymerized polypropylene, homopolypropylene, flame retardant and glass fiber by weight percentage, wherein, flame retardant The fuel is a compound of decabromodiphenylethane and antimony trioxide, and the ratio of decabromodiphenylethane to antimony trioxide is 3:1 by weight percentage; Mix with homopolypropylene at 175-185°C on a double-roller mixer to obtain a molten polypropylene premix; preheat the weighed glass fiber and flame retardant to 185-200°C respectively; The heated glass fiber is mixed evenly with the obtained molten polypropylene premix to obtain a blend; the preheated flame retardant is added to the obtained blend, and the mixture is heated at 175-185°C on a double-roller mixer Mixing is carried out to obtain a flame-retardant reinforced polypropylene composition; its related properties are measured, and the specific data are listed in Table 1.

Comparative example 4:

A kind of polypropylene composition, its raw material formula is as shown in table 1, and its preparation method comprises the steps: take by weight percentage copolymerization polypropylene, homopolypropylene; Mix at 175-185°C on a two-roller mixer to obtain a molten polypropylene premix; continue to mix at 175-185°C on a two-roller mixer to obtain a polypropylene composition; determine its related properties , and the specific data are listed in Table 1.

Table 1 The raw material formula and concrete performance data of embodiment 1～5 and comparative example 1～4

the Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Copolymer polypropylene/wt% 10 10 8 5 15 10 10 10 40 Homopolypropylene/wt% 60 55 60 70 50 60 55 60 60 Decabromodiphenylethane/wt% 15 12 12.75 12 12 10 13 15 - Magnesium hydroxide/wt% 5 3 4.75 6 3 10 2 - - Antimony trioxide/wt% - - - - - - - 5 - Glass fiber/wt% 10 20 15 7 20 10 20 10 - Glass fiber diameter/um 18 20 15 twenty three 25 18 20 18 - Glass fiber length/mm 0.4 0.5 0.6 0.55 0.3 0.4 0.5 0.4 - Tensile strength/MPa 30.40 32.01 31.07 29.6 32.04 29.7 31.1 29.3 32.09 Oxygen Index/% 30.5 32 32 31 31.5 29 30 29 20 UL94 flame retardant rating V1 V0 V0 V1 V0 Not flame retardant Not flame retardant Not flame retardant Not flame retardant

Test standards or methods for each performance:

Tensile strength: test according to ASTM DG638-2008;

Oxygen index: test according to ASTM D2863;

UL94 flame retardant grade: refer to UL94-2009 vertical burning test standard.

Claims (4)

1. a flame-proof reinforced polypropylene composition, is characterized in that, by weight percentage, comprises following component:

Co-polypropylene 5 ~ 15%;

Homo-polypropylene 50 ~ 70%;

Fire retardant 15 ~ 35%;

Glass fibre 7 ~ 20%;

Wherein, described fire retardant is the compound of TDE and magnesium hydroxide, and by weight percentage, TDE is 2:1 ~ 4:1 than the scope of magnesium hydroxide.

2. flame-proof reinforced polypropylene composition according to claim 1, is characterized in that, the melt flow rate (MFR) that described Co-polypropylene is measured by GB/T 3682-2000 is 8-9.4g/min.

3. flame-proof reinforced polypropylene composition according to claim 1, is characterized in that, the diameter of described glass fibre is 15 ~ 25um, and length is 0.3 ~ 0.6mm.

4. a preparation method for the flame-proof reinforced polypropylene composition as described in claim 1 ~ 3 any one, is characterized in that, comprises the steps:

A) Co-polypropylene and homo-polypropylene are carried out on double roll mill mixing in 175-185 DEG C, obtain melt polypropylene Preblend;

B) glass fibre, fire retardant are preheated to respectively to 185-200 DEG C;

C) the melt polypropylene Preblend glass fibre after preheating being obtained with step a) mixes, and obtains blend;

D) fire retardant after preheating is added in the blend obtaining in step c), on double roll mill, carries out mixingly in 175-185 DEG C, obtain flame-proof reinforced polypropylene composition.