PVC cladded polypropylene micro-foamed plastic and its preparation technology

Abstract

The invention discloses a PVC (polyvinyl chloride) cladded polypropylene micro-foamed plastic and its preparation technology. The preparation technology comprises: mixing 98-99.5 wt% of a polypropylene composite material and 0.5-2 wt% of a foaming agent uniformly, then subjecting the mixture and PVC to integrated injection molding in a die cavity. The polypropylene composite material is prepared by the following raw materials by weight percent: 56-98% of polypropylene, 0-25% of an inorganic filling material, 0-15% of a toughening agent POE (polyethylene-octene elastomer), 0.1-1% of antioxidants, and 0-3% of other assistant. And the foaming agent is azodicarbonamide. The technology of the invention has the advantages that: 1. an appropriate amount of the foaming agent is used in a composite material system so as to make the prepared product has better appearance; 2. while guaranteeing the appearance of the composite material, the product prepared in the invention also has various physical mechanical properties basically not influenced; and 3. the preparation technology for improving PVC cladded polypropylene micro-foamed plastic articles has the advantages of simplicity and low production cost.

Description

technical field [0001] The invention relates to a PVC-coated polypropylene micro-foaming plastic and a preparation process thereof, which can be used for automobile interior decoration and belongs to the technical field of polymer material modification and processing. Background technique [0002] Polypropylene is widely used in automotive interior parts because of its good processing performance, physical, mechanical and chemical properties, light weight and low price. Due to the high gloss of polypropylene itself, its comfort and aesthetics cannot meet the growing requirements of people. Polypropylene-coated composite materials are widely used in some mid-to-high-end models because of their excellent appearance and comfort. [0003] The Chinese patent with the patent number CN101352945B discloses a micro-foamed polypropylene-non-woven composite sheet for automotive interiors, which is made of a micro-foamed polypropylene sheet by foaming and extruding by adding a citric ac...

AI Technical Summary

Problems solved by technology

The Chinese patent with the patent number CN101835829A fills the foamed particles into the mold and heats it with water vapor to obtain a foamed molded body in the mold. The molded body has small deformation, good dimensional stability, and excellent surface properties, but it does not involve Application to composite cladding

[0004] The preparation of PVC-coated polypropylene plastic parts by injection molding by injection molding machine has been applied, but in the injection molding process, the PVC artificial leather is only placed in the mold cavity and fixed before injection molding. At this time, the post-shrinkage of the PP material is easy to cause the product Surface sink marks, as well as defects such as bulges and blisters, greatly limit its application

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