Wood-plastic composite and preparation method for special-shape molded member thereof

Abstract

The invention provides a wood-plastic composite. The wood plastic composite comprises a biomass material and a plastic; the biomass material is wooden fiber with a length of 0.1 to 4.0 nm and a length-diameter ratio of 1: 1 to 400: 1; and in virtue of the characteristic of the large length-diameter ratio and low possibility of flowing of the wooden fiber, filling effect and reinforcing effect are exerted on the wood plastic composite, so the mechanical properties of the wood plastic composite are substantially improved and in particular, resistance to impact and creep and other performance of the wood plastic composite are improved, which enables the application scope of the wood plastic composite to be broadened. When a molding process is employed for preparation of the molded member of the wood plastic composite, the thickness and mechanical properties of the molded member can be improved and preparation of the special-shape molded member can be realized; and the advantages of low cost and good market application prospect are obtained.

Description

technical field [0001] The invention belongs to the technical field of processing wood-plastic composite materials, and in particular relates to a method for preparing wood-plastic composite materials and special-shaped molded parts thereof. Background technique [0002] Wood-plastic composite material is a kind of composite material made of agricultural and forestry biomass resources and plastic as the main raw material. It has the advantages of both wood and plastic. Its products are mainly used as substitutes for wood or plastic. The development and application of wood-plastic composite materials are of great significance in the comprehensive utilization of waste, environmental protection and relief of the increasing pressure on natural wood. [0003] At present, there are three main methods of producing wood-plastic composite materials: extrusion, injection and molding. Injection molding can realize the production of wood-plastic composite materials with low wood conten...

AI Technical Summary

Problems solved by technology

However, this molding method will cause uneven mixing, and the wood-plastic door panel is a flat surface with a relatively simple shape.

[0005] The Chinese patents whose publication numbers are CN102140255A, CN102181167A and CN103772805A have solved the problem of inhomogeneous mixing in the above-mentioned molding method. Wood powder, plastic resin and various processing aids are first mixed in a high-speed mixer to obtain a mixture, and then mixed in a high-speed mixer. Mixing in a two-roll mill / plastic mixer, and finally molding to obtain wood-plastic composite materials

However, in the above-mentioned patents, wood powder is used as a raw material, and wood powder has fluidity, which only plays a role of "filling" and not "strengthening" the wood-plastic composite material, so the mechanical properties of the wood-plastic composite material are relatively poor. In particular, the performance of impact resistance and creep resistance needs to be improved, which will greatly limit the application range of wood-plastic composite materials in some engineering fields that have special requirements for material strength; The thickness of the formed parts is limited. Therefore, wood-plastic composite materials are usually used to mold low-thickness regular parts such as plates and strips, which cannot meet the application fields with high thickness requirements, such as the use of wood-plastic composite materials. Special-shaped molded parts, etc., but it is still impossible to produce special-shaped parts with carved shapes, hollow shapes or curved surface patterns, which limits the application of wood-plastic composite materials in replacing solid wood special-shaped products or plastic special-shaped products.

Images