Low-shrinkage sprayable PP/PS blend alloy and preparation method thereof

Abstract

The invention discloses a low-shrinkage sprayable PP / PS blend alloy and a preparation method thereof. The low-shrinkage sprayable PP / PS blend alloy is prepared from the following components in percentage by weight: 30 to 45 percent of polypropylene resin, 25 to 30 percent of styrene resin, 6 to 12 percent of graft compatilizer, 4 to 8 percent of toughening agent, 15 to 20 percent of functional filler, 0.2 to 0.5 percent of antioxidant, and 0.2 to 1 percent of lubricant. The forming shrinkage of the low-shrinkage sprayable PP / PS blend alloy is as low as 0.7 to 0.9 percent and is closed to the level of ABS, and the low-shrinkage sprayable PP / PS blend alloy can directly replace the ABS under the condition of no die repair and does not influence the appearance of an injection molding product.

Description

technical field [0001] The invention relates to a low-shrinkage PP / PS blend alloy which can be directly sprayed. Background technique [0002] ABS plastic is a copolymerized polymer material with rigidity, toughness and balance, and a wide range of uses. The annual consumption of ABS resin in my country has reached 1.5 million tons, and more than 80% of it depends on imports. Due to the high price of ABS, the industry has gradually developed modified PP, and partially replaced ABS with its advantages of low cost, light weight, and good performance. When using modified PP instead of ABS, the greatest interest lies in reducing the cost of raw materials for injection molded products. However, if the molding shrinkage of the two is greatly different, which affects the injection molding process itself, such as difficult demoulding, or affects the appearance of the product, It is necessary to modify the mold or redesign and manufacture the mold, which is something that all inject...

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Problems solved by technology

[0006] It can be seen from the above table that whether it is blending other polymer materials or filling inorganic minerals, the molding shrinkage of polypropylene can be reduced, but only glass fiber can reduce the molding shrinkage of modified polypropylene materials when filled with 30%. The shrinkage rate is reduced to 0.54%, which is close to the molding shrinkage rate of ABS, but seriously affects the appearance of injection molded products, while the molding shrinkage rate of calcium carbonate and talcum powder modified polypropylene is still relatively large, which cannot reach the molding shrinkage rate of ABS.

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