Wood-plastic composite material and manufacturing method thereof

Abstract

The invention relates to a wood-plastic composite material and a manufacturing method thereof. The manufacturing method is characterized by comprising the following steps: mixing 0.2-1 wt% of polyisocyanate alkyl high molecular silane of which the molecular weight is greater than 10000 and wood flour to prepare modified wood flour, and performing mixed molding on 30-80 wt% of modified wood flour and plastic to obtain a wood-plastic product; or by taking dicumyl peroxide as initiator, reacting 1-6 wt% of polyisocyanate alkyl high molecular silane of which the molecular weight is greater than 10000 and polyolefin to obtain a functionalized polyolefin master batch, and performing mixed molding on 2-10 wt% of functionalized polyolefin master batch, plastic and wood flour to obtain the wood-plastic composite material. Compared with the prior art, the invention has the advantages of high crosslinking intensity, large material selection range, low surface migration possibility of high molecular crosslinking agent, weather resistance, no damage to color and smell of wood, low consumption of the crosslinking agent, high wood flour addition ratio and low comprehensive cost.

Description

technical field [0001] The present invention relates to a composite material. Background technique [0002] Wood-plastic composite materials combine the dual advantages of wood fiber materials and polymer materials. Grinding, chemical corrosion resistance, insect resistance, anti-corruption, and dual processing properties of wood and plastic, it can use "waste plastics" and "waste wood fiber materials" as raw materials, and is a resource of biomass and "white pollution" It is an important way of high-efficiency utilization, meets the requirements of circular economy and building a conservation-oriented society, and has huge ecological and environmental benefits. [0003] Lignocellulosic materials are high surface energy systems composed of natural polymer compounds and extracts, while plastics are low surface energy systems formed by non-polar or weakly polar polymers. There is a very clear interface between the two phases. The bonding is weak, and the effective way is to ...

AI Technical Summary

Problems solved by technology

[0004] The traditional solution to compatibility technology is generally to graft polar monomers on the surface of thermoplastic elastomers or polyolefins. The grafted monomers are acidic or basic monomers, and grafted maleic anhydride monomers are the most common and useful. Traditional low-molecular coupling agents modify polar phases such as wood flour, but these traditional modifiers have low cross-linking strength, low material selectivity, low molecular weight, easy surface migration, no weather resistance, and damage to wood. Color and taste, and the dosage is large, the overall cost is high

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