A kind of high-impact polystyrene-modified stress-whitening-resistant polypropylene composite and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a high impact polystyrene modified stress whitening resisting polypropylene compound and a preparation method thereof. High impact polystyrene master batch is added into the polypropylene compound, polypropylene and high impact polystyrene in the master batch are compatible through SEBS graft copolymer, and rubber particles in high impact polystyrene are uniformly and firmly dispersed in a matrix; filling master batch is added in the compound, a coupling agent and a polypropylene graft copolymer in the filling master batch component tightly combine the polypropylene resin with the inorganic filter interface, the polypropylene resin and inorganic filler interface are difficult to peel, and the filling master batch is taken as the matrix and is melted again and extruded to pelletize, so that the toughness and strength of the material are improved; the chain segment adhesive plays a role of a bridge so as to connect molecular chains to build the chain segments into a network structure, so that the inorganic filler is greatly inhibited from moving, and the prepared polypropylene compound has good stress whitening resistance and good rigidity and toughness.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a polystyrene-modified stress-whitening-resistant polypropylene compound and a preparation method thereof. Background technique [0002] Polypropylene plastic products have been widely used in chemical industry, construction, light industry, automobile, home appliance, packaging and other industrial sectors. However, with the development of the industry, the requirements for material properties are getting higher and higher. Ordinary polypropylene must be modified to give it high performance in order to meet the needs. Due to the structural characteristics of polypropylene, polypropylene is susceptible to stress whitening due to external forces such as stretching, bending, and impact during use. In severe cases, it will also affect the performance and quality of the product. Therefore, in some household appliances, Applications such as toys, auto parts and power tools ...

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Problems solved by technology

For example, the patent CN101709124A discloses a folding-resistant and anti-stress-whitening polypropylene material, which improves the toughness and stress-whitening resistance of the material by adding elastomers and self-made anti-stress-whitening masterbatches to the high-impact polypropylene substrate , although the material shows very high impact resistance, the amount of copolymerized polypropylene is too much, resulting in a serious decrease in the rigidity of the material, and the resistance to stress whitening is not very prominent

Patent CN101058655A discloses a filled polypropylene material with resistance to stress whitening and stress cracking. Polyethylene is used to improve stress whitening, but it uses block copolymerized polypropylene, and the amount of copolymerized polypropylene is too much, resulting in the material's resistance to Stress whitening effect is not very ideal

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