Wood-plastic composite profile prepared from waste polyethylene and its preparation method

Abstract

The invention relates to a wood-plastic composite profile prepared from waste polyethylene and a preparation method thereof. The composition ratio of the wood-plastic composite profile is as follows: 100 parts of wood fiber powder, 0.5-1.2 parts of stearic acid, 15-20 parts of waste polyethylene plastic, 3-5 parts of phase solvent, 2-3 parts of lubricant, 0.2 parts of ~0.6 parts of anti-ultraviolet agent, 3-5 parts of coloring agent, 2-4 parts of CPE, 8-12 parts of calcium carbonate; the preparation method is to mix the dried wood fiber powder to 80°C at high speed, and then add stearic acid , high-speed mixing to 130°C; then add the rest of the above components, mix evenly and then add to the parallel twin-screw granulator, plasticize, extrude and pulverize at 140-220°C to obtain granules; the granules are extruded and formed. The polyethylene-based wood-plastic composite material prepared by the invention has excellent comprehensive performance and good processing performance, and the preparation method thereof is simple in operation, low in cost and easy for industrial implementation.

Description

technical field [0001] The invention relates to the technical field of plastic composite modification processing, in particular to a wood-plastic composite profile prepared from waste polyethylene and a preparation method thereof. Background technique [0002] PE-based wood-plastic composite material is a new modified and environmentally friendly material that uses waste wood powder, rice husk, straw and other natural fibers to fill and reinforce PE plastics. It has both the cost and performance advantages of natural fibers and PE plastics, and can be widely used in Manufacture various wood-plastic composite trays, military sleepers, garden guardrails, indoor and outdoor floors and other products, which is one of the main varieties of wood-plastic composite products currently produced in China. The development of this material alleviates the shortage of resources and energy caused by the increasing demand for petroleum resources, wood and forest products. It is an effective ...

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Problems solved by technology

[0003] However, it is well known that there are a large number of polar groups on the surface of wood fibers. During the preparation of wood-plastic composites, there is a relatively large interfacial energy difference between hydrophilic wood fibers and hydrophobic polymers, and it is difficult to fully integrate the two interfaces. , and there are a large number of hydroxyl groups on the surface of wood fibers, which are easy to form hydrogen bonds and lead to aggregation, so that the wood fibers cannot be uniformly dispersed in the polymer, and the aggregates of these wood fibers are prone to stress concentration under the action of external forces, making the product The physical and mechanical properties of the material are greatly reduced, which limits the development of the material and prevents it from being widely used.

Therefore, research on the compatibility of wood fibers and thermoplastics has also been gradually carried out, such as modifying wood flour with coupling agents (CN02157950.4; CN200510060794.1), but the performance is not ideal; grafting maleic anhydride, Ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer (CN200410077610.8; CN02160123.2), ionomer (CN200610005590.2) and polyolefin grafted silane as modifier (CN702125652.7), need to be Prepare the modifier, or increase the cost or increase the process flow

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