In recent years, with the development of technology, the second generation of wood-plastic co-extrusion wood-plastic came into being. It is produced by the most advanced extrusion molding technology in the industry, and the surface of plastic wood is evenly and firmly covered with the co-extruded layer. Using this new technology to produce co-extruded plastic wood, in addition to retaining the advantages of traditional mold-proof, insect-proof and other physical properties, it also has stronger wear resistance, scratch resistance, stain resistance and weather resistance, and is more beautiful and durable. It is suitable for high-end outdoor garden landscape projects. It is worth noting that the biggest difference from the appearance of the co-extrusion floor is that it has an extra layer of plastic-wood protective layer than ordinary products. It is precisely because of the existence of the protective layer that the service life of the product is greatly improved.

Here I will introduce a new technology of high-performance and ultra-high-strength three-layer co-extruded wood-plastic profiles.

Ordinary co-extruded wood-plastic composite materials are usually composed of a surface layer and a core layer, called double-layer co-extruded wood-plastic composite materials. The core layer is generally ordinary wood-plastic material, which provides mechanical properties for plastic wood; the surface layer is generally made of high-priced plastics as raw materials, providing high-strength, high-weather resistance and other properties for the product. Due to the different processing methods and the polarities of the basic resin materials of the surface and core layers, the bonding force of the surface-core layer is the focus of ordinary co-extruded plastic wood. In order to improve the binding force between the surface and the core layer, the same kind or better compatibility resin is often used as the base grease, and a high polarity thermoplastic resin is added to the surface and the core layer to increase the bonding force between the surface and the core layer , such as ionic polymers, maleic anhydride grafted polyethylene, etc. This method not only limits the selection range of the base resin for the surface and core layers, but also because the bonding resin is directly added to the surface layer, granulated and extruded to make it evenly dispersed, so that the bonding resin in the interface layer is less, if a large amount is added Although the adhesive resin can increase the thickness of the adhesive resin layer, it will lead to a significant increase in cost.

In order to overcome the defects that the existing double-layer co-extruded plastic wood materials need to add a large amount of high-polarity thermoplastic resin to the surface layer and the limited selection of surface and core materials, researchers plan to provide a three-layer surface-middle-core The co-extruded wood-plastic composite material of the structure is a copolymer of maleic anhydride grafted polyethylene (PE-MA), maleic anhydride grafted EVA, ethylene-acrylic acid copolymer, and ethylene-ethyl acrylate copolymer originally added to the surface layer. High polarity thermoplastic resins such as ethylene-vinyl acetate-vinyl alcohol copolymer independently constitute the bonding layer (ie, the middle layer), in order to improve the adhesion between the surface and the core layer without increasing the amount of high-polarity thermoplastic resin used. knot force.

Compared with ordinary double-layer co-extruded plastic-wood profiles, using high-polarity thermoplastic resin as the middle layer of three-layer co-extruded plastic-wood materials can increase the peeling value of the surface-core layer, and graphene can significantly increase the surface layer of the profile. wear resistance. The core layer uses glass fiber as a reinforcing material, which can improve the tensile strength, impact strength and bending performance of the material; the three-layer co-extruded plastic wood profile has the advantages of super wear resistance, high strength, tear resistance, etc. Environmental protection and other factors, it will be a plastic wood product that is more in line with market demand.

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