Today, with the rapid development of science and technology, advances in various composite materials research technologies, especially co-extrusion composite technology, have developed rapidly since the rise of the century. Wood-plastic composite coextrusion technology has two types: pre-coextrusion and post-coextrusion. Pre-coextrusion refers to the way in which two materials are composited and simultaneously formed in the process of incomplete molding; then co-extrusion refers to a kind of co-extrusion. After the material has been completely formed, it is then composited with another material. Compared with the traditional pre-coextrusion technology, the post-coextrusion technology has the characteristics of simple process, flexible application, low scrap rate, easy recycling, and controllable bond strength. ASA/PVC co-extruded WPC is widely used in gardens, transportation, construction, home improvement, car and boat interiors. ASA/PVC co-extruded wood products have gradually developed into a new industry as a new material that can replace wood.
Plastic-wood composites as new building materials, the latest research shows that due to the complex interaction between the components will affect the weather resistance, color loss and aging resistance of the materials, as well as strong ultraviolet rays, cold and heat changes and wind and rain due to the use of the environment Erosion also causes problems such as discoloration, chalking, cracking, and strength reduction of plastic wood with low weathering plastics (polyolefin PE, PP, PVC). It is understood that when most of the wood-plastic materials in the market in China are used outdoors, the time of fading (△E>3) is generally 15 days-90 days, and the resulting customer complaints and related claims will always be plagued. Industry development. Therefore, how to improve the weather resistance of plastic wood has become the key to the development of the industry. ASA/PVC co-extruded wood can improve its performance. ASA coating and PVC dry blending are combined in a separate flow path before exiting the die. The ASA melt is compounded with a large area of PVC melt in a very thin thickness. And they are extruded out of the mold together, and then cooled and shaped by the shaping die and the water tank; after polishing, pulling, the protective film is attached, and finally sawed into a prescribed length. The product is easy to mold, and can be molded by ordinary plastic processing equipment or after a little modification. The surface of the co-extruded ASA coated wood substrate is completely isolated from the environment, and the ASA is put on the plastic wood. A layer of armor, which greatly improved its weathering and aging resistance. ASA surface coextrusion wood compounding has been widely adopted in Europe and the United States as an advanced technology.
Acrylonitrile-styrene-acrylic rubber terpolymer (ASA) is a copolymer of styrene-acrylonitrile resin and acrylic rubber, and has excellent weather resistance due to its structural characteristics. It has excellent durability in the natural environment and maintains its color and physical properties even after long-term exposure to strong ultraviolet rays, moisture, heat and cold weather. Therefore, it is the first choice for outdoor materials. It has been widely used in building materials, automobiles and other fields since its inception. The ASA surface coextruded wood composite is based on a common plastic-wood composite that is coextruded with a layer of ASA material. Especially for the technical difficulties involved in the wood-plastic industry, some companies have successively developed series products such as high-gloss, matte, wood grain and metal texture, which have been introduced to the market. The quality and technical performance of matt and wood grain products are already in the market. The industry's leading level provides customers with a wider range of options and high value-added products.
As a new type of weather-resistant material, ASA is widely used in the production of color co-extrusion profiles, interior and exterior wall gussets, plastic wood doors and windows, handrails, fences, floors, fences, exterior wall panels, formwork, interior and exterior wall slabs, and wood-plastic composites. The process is basically the same as the above products, but has the characteristics of the foamed substrate itself.
The localization of ASA co-extruded materials provides a solid and favorable guarantee for the improvement of plastic wood quality. With the vigorous development of the Chinese market, the requirements for colorization, effect and functionalization will be higher and higher, and higher requirements are imposed on ASA co-extruded materials. Ultra-high weather resistance, wood grain effect, metal texture, and ASA products that reduce heat absorption and meet low carbon environmental protection will be a new trend in market demand development. Therefore, the urgent task for the future development of the plastic wood industry will be to comprehensively improve the aging resistance, weather resistance and stable quality of materials. As the market matures, the plastic wood will also put forward higher requirements: long-lasting weather resistance, color stability, log texture and metal texture aesthetic effect will also become a new market development trend.
In recent years, there have been more and more extruded wood products in the European and American markets, not only traditional high-end plastic wood doors and windows, handrails, fences using plastic wood co-extrusion, even low-end floors, fences, exterior wall panels, and templates are coming. The more wood-based co-extrusion, at present, the total volume of plastic-wood co-extrusion products has exceeded 50%. It can be said that co-extrusion of plastic-wood has become the mainstream trend of plastic-wood products. North American plastic wood market accounts for more than 70% of the global plastic wood market, of which plastic wood flooring accounts for more than 30%. Taking plastic wood flooring as an example, according to the US market research company, in recent years, the demand for plastic wood flooring in the United States has risen steadily. Sales of ordinary plastic wood flooring (non-co-crushing) decreased by 25%, and co-extruded plastic wood flooring increased by 30%. Co-extruded wood flooring has accounted for 50%-75% of the total sales of plastic wood flooring. The surface of co-extruded wood-plastic floor has realistic wood texture, stronger weather resistance, high surface hardness, no scratching, and lower water absorption. Overcome the shortcomings of most common plastic wood flooring. The price of co-extruded wood-based flooring is 30%-35% higher than that of ordinary plastic wood flooring (non-co-extrusion). I believe that China's co-extruded wood market will have a strong development trend.
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