Composition for preparing polypropylene plastic-wood composite material, composite material prepared from composition and application of composite material

Abstract

The invention provides a composition for preparing a polypropylene plastic-wood composite material. The composition comprises the following components in parts by weight: 100 parts of polar monomer modified polypropylene; 10-70 parts of wood flour, 4-15 parts by weight of an inorganic filler; 2-8 parts by weight of nano calcium carbonate; 4-25 parts by weight of a compatilizer; and 2-8 parts by weight of a flexibilizer. The foamed sheet prepared by foaming the plastic-wood composite material prepared from the composition has the characteristics of flat surface, compact cells, uniform cell diameter, low and controllable foaming ratio, closed-cell hard structure, good impact and bending properties and the like.

Description

technical field [0001] The present invention relates to a composition for preparing polypropylene wood-plastic composite material and the composite material and application thereof, in particular to a composition for preparation of polypropylene wood-plastic composite material, which is prepared from the composition Polypropylene wood-plastic composite materials, polypropylene wood-plastic foam boards and their applications. Background technique [0002] In recent years, for the sake of energy efficiency, the lightweight of structural components in aircraft and high-speed railways has been paid more and more attention. Research on foam moldings is increasing. In the disclosed and industrialized foaming process, the method of directly mixing the base material into a thermally decomposed chemical foaming agent such as azodicarbonamide, sodium bicarbonate or citric acid to obtain a foamed molded body is more commonly used. Chemical foaming agents are widely used in injection ...

AI Technical Summary

Problems solved by technology

However, this material also has some defects in the process of using

On the one hand, since the main components of wood flour are lignin and cellulose, etc., which are rich in hydroxyl groups, they are prone to self-polymerization, while polypropylene is a non-polar high-crystalline polymer, and its compatibility with wood flour Poor, it will lead to problems such as poor toughness and large molding shrinkage of wood plastic materials; And during use, it will lead to problems such as fracture and failure of plastic wood materials, which will affect the service life and use effect

In the prior art, it is common to add a large amount of compatibilizer or use silane coupling agent to modify the surface of wood powder to improve the performance of wood-plastic products, which often makes the processing more complicated.

Images