Vehicle spraying-free composite material and preparation method thereof

Abstract

The invention relates to a vehicle spraying-free composite material. The vehicle spraying-free composite material comprises the following raw materials: polypropylene resin, fillers, metal powder, straight-chain alkyl acid salt, cyclopentadiene and an antioxidant, wherein the metal powder adopts double-layer wrapping; the inner layer is wrapped with thermosetting resin; and the outer layer is wrapped with silicon dioxide nanopowder. Meanwhile, the invention also relates to a method for preparing the method. Aluminum powder is wrapped by double layers; the inner is used for reducing the heat conductivity coefficient of the metal powder, so that occurrence of a welding line is reduced; and the outer layer of silicon dioxide nanopowder can prevent physical or chemical change of the metal powder and the inner layer during high-temperature treatment. Due to addition of the straight-chain alkyl acid salt, the compatibility of the powder and the polypropylene base material is improved and occurrence of current ripple is reduced; and due to addition of the cyclopentadiene, crosslinking effect can be achieved and the integral hardness of the material is increased; meanwhile, due to the high-temperature depolymerization characteristic of the cyclopentadiene, the high-temperature processing property of the polypropylene resin is not influenced.

Description

Technical field [0001] The invention relates to the field of materials for vehicles, in particular to a spray-free composite material for vehicles and a preparation method thereof. Background technique [0002] With the continuous development of the automotive industry, the application of new materials and technologies provides new ideas for the development of parts. The interior and exterior plastic products of automobiles are usually sprayed with paint, which not only involves complicated procedures, but also causes great pollution to the environment. Spray-free materials are materials that add metal powder to plastic raw materials and directly inject them to make the products show the appearance of spraying. Nowadays, some interior and exterior decoration free spray parts have gradually replaced spray paint parts into the market. The application of spray-free materials simplifies the molding process of automotive interior and exterior parts to a certain extent, enhances prod...

AI Technical Summary

Problems solved by technology

[0003] However, there are still some shortcomings in the spray-free materials for vehicles at present: for example, after the material is injected into a finished product, there will be appearance problems such as weld lines and flow marks on the surface; at the same time, the hardness of the spray-free material is still much worse than that of metallic paint. The current solution The method is to add a cross-linking agent; but the addition of a cross-linking agent greatly affects the thermal processing performance of the material, thereby affecting the injection molding performance of the material