Modified polypropylene composite material of high gloss and low shrinkage and preparation method thereof

Abstract

The invention discloses a modified polypropylene composite material of high gloss and low shrinkage and a preparation method thereof. The polypropylene composite material includes the raw materials of by weight: 100 parts of PP (polypropylene) resin, 25-40 parts of PS (polystyrene) resin, 5-15 parts of a compatilizer, 1-6 parts of a flexibilizer, 35-40 parts of a reinforcing agent, 0.3-0.6 parts of an anti-oxidant, 0.5-1.2 parts of a lubricant and 0.3-0.5 parts of a nucleating agent. The preparation method comprises the steps of: mixing the PP resin, the PS resin, the compatilizer, the flexibilizer, the anti-oxidant, the lubricant and the nucleating agent uniformly at a high speed, then adding the reinforcing agent into the mixture and continuing high-speed mixing, adding the obtained mixture into an extruder, conducting extrusion granulation after fusion, thus obtaining the composite material. The modified polypropylene composite material prepared by the method provided in the invention has the characteristics of high gloss and low shrinkage as well as the advantages of good impact strength and high flexural modulus. And the composite material of the invention can be used for material replacement under the precondition of not replacing the original ABS (acrylonitrile butadiene styrene) die and for production of household electrical appliance surface shell products.

Description

technical field [0001] The invention relates to the field of modified plastics, in particular to a high-gloss, low-shrinkage modified polypropylene composite material and a preparation method thereof. Background technique [0002] ABS material is widely used in the surface shell parts of home appliances due to its good surface gloss and the balance of impact toughness and rigidity. However, due to its high price, low heat distortion temperature and poor weather resistance, people try to use cheap PP and other materials instead. ABS material has become a trend. [0003] PP material has excellent heat resistance, good bending fatigue resistance, low price, and wide application; but PP has low impact toughness, poor creep resistance, large molding shrinkage, and poor dimensional stability; ordinary PP materials cannot directly replace ABS materials , and there is no relevant application and report of high-gloss PP replacing ABS material on the mold with ABS shrinkage rate; thr...

AI Technical Summary

Problems solved by technology

[0006] Patent No.: 200810030391 "Low-shrinkage sprayable PP / PS blend alloy and its preparation method" The compatibilizer selected is a graft compound of polypropylene grafted with polystyrene, the material has low gloss, and the preparation of high-gloss materials requires Spray treatment

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