Flame-processing-free waterproof polypropylene composite material which can be coated easily, and preparation method thereof

Abstract

The invention discloses a flame-processing-free waterproof polypropylene composite material which can be coated easily, and a preparation method thereof. The flame-processing-free waterproof polypropylene composite material which can be coated easily comprises, by weight, 50 to 90 parts of polypropylene resin, 5 to 20 parts of a flexibilizer, 8 to 25 parts of a filling material, 0.3 to 3 parts ofan amide wax, 0.1 to 3 parts of an anti-oxidant, 0.05 to 0.2 part of a phosphate, and 0.1 to 5 parts of a processing auxiliary agent. According to the preparation method, the phosphate and the amide wax are combined, so that rapid crystallization is realized, the higher the crystallization degree, the compacter a compact layer formed on part surfaces is, the better solvent resistance is achieved,the higher material surface tension force is, and the better coating performance is, paint film and PP material tight combination is ensured, a protective film is formed on material surface, penetration of water molecules is prevented, and material water resistance is improved; the particle size of an added filling material is controlled, so that surface tension is improved further, and painting performance and material water resistance are improved.

Description

technical field [0001] The invention relates to the technical field of plastics for vehicles. A high-performance polypropylene material is invented. Injection-molded coating parts can be treated without flame, and have good coating performance and water resistance, and can be used to produce automobile bumper parts. Background technique [0002] With the rapid development of the automobile industry, the competition in the domestic and foreign automobile industries is becoming more and more fierce, and the requirements for the cost, energy saving and environmental protection of automobile materials are getting higher and higher. Polypropylene (PP) materials are characterized by their low specific gravity and excellent mechanical properties. , low cost, easy processing and other characteristics are widely used in automotive parts, including bumpers, instrument panels, door panels, pillars and various decorative or functional parts. [0003] Generally speaking, due to the requi...

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Problems solved by technology

[0006] Prior art CN106750951A discloses a flame-free sprayable polypropylene composite material and its preparation method, which consists of the following raw materials by weight percentage: polypropylene 48-97%, inorganic filler 15-25% (talc with an average diameter of 5 μm powder, 2500 mesh), elastomer toughening agent 5-15%, compatibilizer 0-3%, surface lubricant 0-1%, stabilizer 0.1-2%, other additives 0-5%; through polypropylene, The synergistic effect of inorganic fillers, elastomer tougheners, compatibilizers, and surface lubricants allows the resulting product to be painted without flame treatment, and the paint has good adhesion. However, it also does not involve the relevant water resistance of the prepared materials after painting

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