Formula, preparation method and device of environment-friendly modified polypropylene material for automotive trim

Abstract

The invention discloses a formula, a preparation method and device of an environment-friendly modified polypropylene material for automotive trim, and the material is prepared from the following components in percentage by weight: 80-100 parts of recycled polypropylene material granules, 1-5 parts of maleic anhydride, 0.3-0.5 part of dicumyl peroxide, 0.01-0.02 part of a special antioxidant and 1-5 parts of a polypropylene compatilizer. The raw materials are put into the preparation device of the modified polypropylene material, and the modified polypropylene material is prepared through pre-melting, high-temperature modification, grafting, pressing and shearing extrusion. According to the invention, by improving and optimizing the preparation mode of the existing modified polypropylene material, the recycled polypropylene material particles are efficiently grafted with maleic anhydride and dicumyl peroxide by utilizing high-temperature modification, the free amount of maleic anhydride is reduced, and the environment-friendly property of the modified polypropylene material is improved; trace amounts of specially modulated antioxidants, the heat stability and the oxidation resistance are improved, and the modified polypropylene material is prevented from being oxidized and decomposed at high temperature in the vehicle body to release peculiar smell.

Description

technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a formula, a preparation method and a device for an environment-friendly modified polypropylene material for automobile interior decoration. Background technique [0002] In recent years, the National Development and Reform Commission and the Ministry of Ecology and Environment have officially issued the "Opinions on Further Strengthening Plastic Pollution Control", and automotive interior materials have been actively responded to, using low-carbon environmentally friendly materials to fill polypropylene materials, reducing the use of petroleum-based plastic resins. So far, the hemp fiber felt-filled polypropylene material based on the hot pressing process has been widely used in automobile door panels and seat back linings. Polypropylene resin (PP) is a thermoplastic resin prepared by polymerizing propylene. . According to the arrangement position of the methyl...

AI Technical Summary

Problems solved by technology

Although polypropylene materials used as car door panels and seat back linings meet the low-carbon and environmental protection requirements of interior materials, their use in car interior parts is limited due to the strong odor and difficult to modify the appearance. Currently, it is removed or The main way to improve automotive interior parts and cladding parts is to use activated carbon, silica gel, etc., but the pore size of activated carbon varies, the maximum pore size is as high as about 1000 angstroms, the gas adsorption is not targeted, and it can absorb other additives together. It affects other characteristics of the material, and has adsorption saturation, which cannot completely remove the odor. The adsorbed small molecular substances will be released again at high temperature, and the odor control effect is not satisfactory. Therefore, it is still necessary to deodorize the polypropylene material at the source. deal with

[0004] In addition, the preparation of existing modified polypropylene materials still generally adopts the traditional general-purpose mixing reactor and twin-screw extruder structure, using the reactor for hot-mixing grafting of polypropylene materials, and after the reaction is completed, manually The unloading material is transported into the extruder for extrusion. During the raw material transfer process, the finished material that has been grafted at high temperature loses a lot of heat through the transfer, which leads to the solidification of the material body and needs to be heated again inside the extruder. The secondary temperature rise seriously affects the material. The stability of the macromolecular chain in the body destroys the molecular structure of the material particles, which changes the properties of the finished material. Secondly, the labor intensity of the input is increased, the production cost is high, and there are certain defects.

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