Flame-retardant polypropylene-nylon complex with high rigidity, high heat resistance and impact whitening resistance and preparation method thereof

Abstract

The invention discloses a flame-retardant polypropylene-nylon composite material with high rigidity, high heat resistance and impact whitening resistance. The composite material contains the following base material components in percentage by weight: 20-50% of polypropylene, 5-10% of a nylon master batch, 15-25% of a brominated flame retardant, 5-10% of a synergic flame retardant, 20-35% of a filling master batch and 0.1-5% of a chain segment binder; the composite material further contains an antioxidant and a processing aid, wherein a base material of the nylon master batch consists of nylon resin, polypropylene resin and a polyolefin thermoplastic elastomer graft; and a base material of the filling master batch consists of polypropylene resin, an inorganic filler, a coupling agent and a polypropylene graft. A preparation method comprises the steps of mixing raw materials uniformly, then adding the mixture into a screw extruder, performing melt blending reaction, extruding and granulating to obtain the composite material. The composite material disclosed by the invention has relatively high rigidity and toughness, high-temperature low precipitation performance and good impact whitening resistance, and can be applied in the fields of household appliances, automobile parts, electric tools and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high-rigidity, high-heat-resistance, shock-resistance, whitish-flame-retardant polypropylene-nylon compound and a preparation method thereof. Background technique [0002] Polypropylene is one of the five general-purpose plastics and has 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, PP 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...

AI Technical Summary

Problems solved by technology

Therefore, many patents solve the toughness and stress whitening problems of polypropylene in various ways, but there are basically no patents that address the problem of improving the stress whitening of flame-retardant polypropylene.

For example, the patent CN101709124A discloses a non-flame-retardant polypropylene material that is resistant to folding and anti-stress whitening. By adding elastomers and self-made anti-stress whitening masterbatches to the high-impact polypropylene base material, the toughness and stress resistance of the material are improved. Whitening performance, although the material shows very high impact resistance, but the amount of copolymerized polypropylene is too much, resulting in a serious decrease in the rigidity of the material, while the resistance to stress whitening is not as high as expected

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 is not great

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