Low-odor and low-VOC microcellular foaming modified polypropylene material and preparation method thereof

Abstract

The invention discloses a low-odor and low-VOC microcellular foaming modified polypropylene material which comprises the following components in parts by weight: 70 to 90 parts of polypropylene resin,0 to 10 parts of elastomer, 0 to 20 parts of filler, 1 to 5 parts of deodorant, 1 to 5 parts of assistant master batch and 2 parts of foaming agent. The polypropylene resin is at least one of high-crystallinity co-polypropylene, high-melt-strength polypropylene and high-fluidity polypropylene. The material has good mechanical strength and rigidity, the characteristics of low odor and low VOC of the material are guaranteed, and the light weight requirement of a microcellular foaming material plastic part of the whole vehicle is met. The invention further discloses a preparation method of the low-odor and low-VOC microcellular foaming modified polypropylene material, raw materials are simple and easy to obtain, the preparation method is simple in process, and large-scale industrial production can be achieved.

Description

technical field [0001] The invention relates to the technical field of modified polypropylene materials for automotive interior decoration, in particular to a low-odor, low-VOC microcellular foamed modified polypropylene material and a preparation method. Background technique [0002] In recent years, with the continuous deepening of research on the lightweight of the modified plastics industry in the automotive field, various methods and means to reduce the density of parts have emerged. Means to make automobile parts form a foaming scheme with a hollow structure, etc. These schemes can be superimposed on each other and can penetrate each other. These schemes all put forward higher requirements on the performance of the modified polypropylene material used, especially in the field of foaming schemes. The chemical microporous foamed modified polypropylene material for automotive interior decoration needs to meet the working conditions of automotive interior parts. The mater...

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Problems solved by technology

[0003] 1. Polypropylene material hardly flows below the melting point, and the viscosity of the melt above the melting point drops sharply, and the decomposition temperature of the foaming agent is within a certain range. When it exceeds this range, the foaming agent will either fail or the foaming volume will be out of control , so due to this special property, the foamable temperature range of polypropylene is relatively narrow;

[0004] 2. The specific heat capacity of polypropylene melt is large, and a large amount of heat will be released when it changes from a molten state to a crystalline state, which will further reduce the viscosity of the melt and cause the polymer to change from melt to solid. It takes a long time, which is not conducive to the formation of cells. stereotypes;

[0005] 3. The air permeability of polypropylene material is high, and the gas generated by the foaming agent is easy to escape;

The polypropylene matrix resin is polypropylene polymerized by hydrogen modulation method, that is, ordinary polypropylene material is used as the matrix for modification treatment, the composite material cannot be foamed, and the gas generated by the foaming agent when heated is easy to escape, and then foams. Bubbles on the surface of the material burst during the bubble process, resulting in poor material surface

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