Polypropylene wood-plastic composite material and preparation method thereof

Abstract

The invention relates to preparation and research of a polypropylene wood-plastic composite material. The polypropylene wood-plastic composite material is prepared from the following raw materials inparts by weight: 40-60 parts of wood powder, 20-50 parts of polypropylene, 0.2-1 part of surface treatment agent, 0.2-0.8 part of lubricant, 0.2-1 part of modifier, 01- 1 part of flame retardant and 0.2-1 part of compatibilizer. The invention also provides a preparation method of the polypropylene wood-plastic composite material. The polypropylene wood-plastic composite material prepared by the method has greatly improved impact strength, tensile strength, modulus and flame retardant performance, thus meeting the requirements of multiple occasions for the productioni technique and the usability.

Description

technical field [0001] The invention belongs to the field of wood processing, and in particular relates to the preparation and research of a polypropylene wood-plastic composite material. Background technique [0002] Wood-plastic composites (Wood-Plastic Composites, referred to as wood-plastic composites) use waste wood, crop straw, etc. that have been pulverized into powder, and plastics as raw materials, add various additives to it, and combine them after hot pressing. A new type of composite material with high performance and high added value produced by various processing techniques such as melt extrusion or melt extrusion. In recent years, since various plant fiber materials are developing into wood materials of wood-plastic composite materials, in a broad sense, various plant fibers are a new type of wood-plastic composite material composed of different plastics. composite material. (Research, development and prospect of wood-plastic composite materials, 2005, 02, 5...

AI Technical Summary

Problems solved by technology

[0004] (1) Wood powder contains a large number of hydrophilic groups (hydroxyl groups), and its polarity is very strong, but common resins are usually non-polar and non-hydrophilic materials. Therefore, plant fibers and resin matrix The compatibility between them is very poor, and the interface adhesion is low, which affects the mechanical properties of wood-plastic composites.

[0005] (2) Because hydrogen bonds can be formed between hydroxyl groups, there is a strong interaction between plant fibers, which makes their dispersion in the resin matrix extremely poor, and it is difficult to achieve uniform dispersion.

[0006] (3) The plant filler is relatively easy to degrade during the molding process. When the temperature rises, the resin matrix will also undergo thermal degradation. If the processing conditions are not suitable during the mixing and processing of the material, the mechanical properties of the wood-plastic composite material will be reduced. and performance degradation using

[0010] In CN101070406A, the addition of peroxide and multifunctional monomers is adopted. Although the process is simple and the cost is low, this method has a great influence on the processing equipment and is easy to corrode the equipment due to the addition of peroxide.

However, polypropylene is sensitive to notches, has low notched impact strength, and has fatal weaknesses such as prominent low-temperature brittleness, large self-friction coefficient, and high wear rate.

[0012] At present, some wood-plastic composite materials are produced with polypropylene as the base material. Due to the influence of the characteristics of polypropylene, this kind of wood-plastic materials have great defects in impact performance and tensile performance.

Images