Wood-plastic composite material and preparation method thereof

Abstract

The invention relates to a wood plastic composite material and the method for preparing the same. The method comprises following steps: mixing raw mterial, polymerizing and extrusing in screw compressor. The raw material and their proportion by weight are as follows: wood powder or plant fiber 100, polyolefin with high melting index 10- 30, normal polyolefin 30- 50, maleic 0.1- 1, and peroxide 0.015- 0.15, and the high melting index MI is 20- 50. The invention employs plastic grafting technology, plastic alloy technology and mixed material intercrossing net conception to produce wood plastic composite material suitable for construction module. The method can take mixed recovered plastic of various variety and brand as raw material, which reduces strict requirement for plastic material and increases mechanical property for wood plastic composite material. The invention is characterized by converting disadvantages in process to advantages for mechanical property by employing effective processing technology and method.

Description

technical field [0001] The invention relates to a wood-plastic composite material for building formwork and a manufacturing method thereof. Specifically, it uses plastic grafting technology, plastic alloy technology, and plastic blending modification technology to manufacture wood-plastic composite materials and its manufacturing method. This method especially refers to the grafting of mixed thermoplastic recycled raw materials with maleic anhydride to cause a lipidation reaction with the hydroxyl groups contained in wood flour, the introduction of bridging agents and the use of peroxides as reactive compatibilizers to make different Graft cross-linking occurs between the plastic molecules of the species. Wood-plastic materials that form an interpenetrating network structure. Background technique [0002] There are currently two types of wood-plastic products on the market, and their preparation processes can generally be divided into two types: one is to use adhesives to ...

AI Technical Summary

Problems solved by technology

However, there are two problems in the above method: 1. The plastic substrate used is single, and recycled materials mixed with various plastics cannot be used, which directly affects the cost of wood-plastic products

2. In order to improve the mechanical properties of wood-plastic composite materials, the MI of the resin used is low, and the mechanical strength of the prepared wood-plastic material is ensured by means of the longer molecular chain of the resin. However, due to the high melt viscosity of the polymer blend , polymer macromolecular free radical movement ability is relatively weak, it is difficult to form a polymer interpenetrating network structure, and the performance of the material cannot be further improved