Core-shell structure based wood-plastic composite and coextrusion processing method thereof

Abstract

The invention relates to a wood-plastic composite and a coextrusion processing method thereof, in particular to a core-shell structure based wood-plastic composite and a coextrusion processing method thereof. The wood-plastic composite aims at solving the problems of poor shock resistance, low wear resistance and easy aging and overcoming the problem that general screw extruders have difficulty in processing low flow high molecular materials. The prepared wood-plastic composite is composed of an inner bone and a shell, and the inner bone is encased by the shell. The coextrusion processing method of the wood-plastic composite comprises the steps that a wood-plastic granular material is extruded by a main extruder to obtain the inner bone of the wood-plastic composite, then a low flow high molecular material is extruded by a plunger type extruder to obtain the shell of the wood-plastic composite, and then the wood-plastic composite disclosed by the invention is extruded through a coextrusion mold. The wood-plastic composite is applied to the fields of indoor decoration, outdoor decoration and building.

Description

technical field [0001] The invention relates to a wood-plastic composite material and a co-extrusion processing method thereof, in particular to a wood-plastic composite material based on a core-shell structure and a co-extrusion processing method thereof. Background technique [0002] Wood-plastic composite (WPC) is widely accepted by the market due to its low-carbon environmental protection, renewable, low maintenance cost and diversified product styles. This kind of material is made by adding a large amount of lignocellulosic materials into the thermoplastic matrix. Its strength is greatly improved compared with that of plastics, but with the increase of lignocellulosic material content, its toughness also decreases significantly. Especially the wood-plastic doors and windows that have appeared on the market in recent years have problems such as low toughness, poor wear resistance, and easy aging. Some people use polyvinyl chloride to coat wood-plastic co-extruded door a...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor impact resistance, low wear resistance and easy aging of the existing wood-plastic composite materials, and to provide a core-shell structure based on high impact resistance, high wear resistance, high corrosion resistance and It is easy to realize the wood-plastic composite material with aging resistance; at the same time, in order to overcome the problem that the general screw extruder is difficult to process low-fluidity polymer materials, a co-extruder based on the main extruder and the plunger extruder is provided. Extrusion processing method