With the rapid development of modern industry and the ever-increasing improvement of people’s living standards, people’s requirements for timber are increasing day by day. However, my country is a country with poor timber resources. The results of the seventh national forest resource inventory show that the country’s forest area is 194.5522 million hectares. , The forest coverage rate is only 20.36%¨J. Facing the serious shortage and near-exhaustion of forest resources in our country, finding a material that can replace wood has become an ideal way to solve this contradiction. It is also considered that a large number of non-degradable wastes appear in the production process and after use and consumption of plastic products, which seriously threaten the living environment of human beings. Therefore, wood-plastic composite material (WPC) has been the focus of research on environmentally friendly composite materials in recent years, and has become one of the new materials that countries around the world are competing to develop in the new century. It has broad application fields and good application prospects. However, in actual use, WPC has gradually exposed some shortcomings: compared with wood, its density is higher; compared with plastic, WPC has lower ductility and impact strength. These shortcomings limit the application of WPC in certain industrial fields to a certain extent.

In recent years, researchers and experts have used physical and chemical foaming methods to give materials unique properties; not only can they effectively overcome the shortcomings of wood-plastic composites, but also have high specific strength, good processing performance, and price Low advantages; can replace wood, plastic, glass fiber, metal, composite materials; in the fields of architectural decoration, packaging and transportation, interior decoration, etc., especially in the construction industry and automobile manufacturing industry, there is a broad development prospect. The earliest wood-plastic foam The matrix resin of the composite material is, but PS foam products use chlorofluorocarbons in the molding process, which will destroy the atmospheric ozone layer, and are difficult to degrade and recycle, easily causing "white pollution", and it has gradually been banned from use. At present, the most researched and widely used in the market are polyvinyl chloride (PVC)-based wood-plastic foamed composite materials.

However, the chlorine released during the preparation of PVC composite materials will corrode equipment; during manufacture, use and disposal, harmful substances such as dioxins, hydrochloric acid, lead, etc. will be produced; dense smoke will be generated during combustion, which will cause certain damage to human health. HCI gas is hazardous; and after being burned or buried, it will pollute the soil and water sources. Therefore, scholars are now gradually turning to research on the foamed WPCt20 of polyolefin plastics, but the rigidity and maximum use temperature of PE-based composite materials are low, and they are not easily degraded. In view of the advantages of polypropylene plastic (PP) with light weight, rich source of raw materials, superior performance-to-price ratio, excellent heat resistance, chemical resistance, and easy recycling and degradation, the research of epp material-based wood-plastic foamed composite materials has recently received The attention of domestic and foreign scientific researchers has become the research focus of industry and science.