| According to the national “Ninth Five-Year Plan†and the vision of “To replace wood, plastic to replace steel, save resources and protect the environment†in 2010, Institute of Plastic Machinery and Plastic Engineering, Beijing University of Chemical Technology and Shanghai Chad After years of research and research, the plastic products cooperation company successfully developed the new technology of PVC/wood powder composite materials and their products. It is characterized by adding 30-50% of wood fiber filler (wood flour) and various processing aids such as stabilizers, modifiers, lubricants, foaming agents, etc. to the PVC plastic raw materials, and mixing them with a high-speed mixer. Wood-plastic granules of different specifications and grades are prepared by special granulating extruder. Finally, various shapes of PVC wood-plastic composite micro-foamed decorative profiles are produced by using molding extruder, mold and different processes. The key technology is to ensure a high filling amount of wood powder, so as to achieve lower production cost and higher performance of the product, and at the same time, the surface of the wood powder can be well wetted by the PVC resin. , to achieve the best combination interface. The project is in line with the national new project to focus on material saving, energy saving and safety, to meet the needs of the market, to fill the spirit of domestic blank requirements, and to meet the long-term technical national policy of “to replace wood with plastic†and “to replace steel with plasticâ€. PVC/wood flour composites are developing rapidly, and they are gradually replacing traditional wood products with their high toughness and low cost. However, when PVC and wood powder are combined, the ductility and impact resistance are reduced, the material is brittle and the density is nearly twice as high as that of traditional wood products. These factors limit its widespread use. In order to eliminate the above disadvantages, the impact modifier is usually added by adding an impact modifier, but this method is almost ineffective in improving the ductility of the article and reducing the density. In recent years, the research and development direction has turned to micro-foaming molding technology. The foamed PVC/wood powder composite material can passivate the crack tip and effectively prevent the crack from expanding due to the good cell structure, thus significantly improving the material resistance. Impact properties and ductility, and greatly reduce the density of the product. The extrusion micro-foaming method is the main method for molding foamed plastics because of its low cost, high efficiency, short time-consuming and easy industrialization. Second, the characteristics of PVC / wood powder composite micro-foaming new materials PVC/wood flour composite extruded micro-foamed products combine the excellent properties of wood and plastic. The product has achieved the effect of real wood. The production cost is also lower than that of wood products. Its emergence will bring a revolution to the wood products industry, especially in today's shortage of resources and soaring raw material prices, which brings new vitality to the plastics processing industry. Its characteristics are as follows: 1, with water resistance The water absorption of the wood itself is as high as 8-10%, but after the surface treatment of the wood powder, a polymer film is formed on the surface, and the wood powder is also tightly coated with the polymer material. The test results show that the water absorption of the material is less than 2 %, has a certain waterproof performance. 2, with flame retardancy This is related to the molecular structure of polyvinyl chloride in the material. Because the content of chlorine in the molecular structure of PVC is as high as 56%, and the chlorine itself has a self-extinguishing function from fire, the oxygen index of the material is usually above 35. 3, good mold resistance Because the wood powder is surface treated and coated with polymer materials, there is no environment for mold growth. At the same time, in the process of wood powder, the surface is adsorbed with anti-fungal agent, which also improves the anti-mildew property of the product. 4, strong woody Because the wood powder content in this material can reach 30-50%, and through micro-foaming, the product density can be controlled between 0.6-1.0g/cm, which is very close to the density of wood, and the internal structure is loose, with natural wood. Texture. Can be equipped with a variety of colors and shapes, eliminating the trouble of color difference. 5, practicality With all the safety features of solid wood: nailable, planable, lacquerable (optional paint free). Especially suitable for large-scale, factory-based rapid decoration, fast and convenient. 6, corrosion resistance: The wood powder itself has poor corrosion resistance, but after being coated with a polymer material, since the polyvinyl chloride itself has good acid-base inertness, the material has good corrosion resistance. 7, electrical insulation performance is good. Third, the application prospects With the improvement of people's living standards and the popularization of housing projects, the market for home decoration is getting bigger and bigger, the demand for decoration materials is gradually increasing, and the quality requirements are getting higher and higher. As a high-grade decoration and decoration material, wood-plastic composite decorative profiles have great market potential. As a new type of wood substitute, it can be widely used in architectural decoration and packaging, such as corner lines, wood shavings, curtains, door buckets, floors, fences, skirting boards, art boards, blinds, frames, frames, windows. Boxes, toys and ordinary furniture, interior doors, etc., most of the indoor and outdoor decorative building materials can be made of PVC wood plastic materials. It is particularly worth noting that the use of logs to make decorative materials not only brings fire hazards, but also easy to mold and insects, posing a safety hazard. PVC wood plastic completely abandons the shortcomings of logs, improves the shortage of logs, and retains the unique woody feel of logs. Compared with wood, wood-plastic materials have waterproof and fireproof functions, which can be used for decoration of kitchens, bathrooms, and the like. At the same time, PVC wood plastic materials can produce products of different grades, different specifications and different colors according to different wood species and colors. Since the production process uses extrusion molding, automatic continuous production can be realized, and the length can be arbitrarily determined, which is impossible for logs. Wood-plastic products have attracted extensive attention from the international community and are known as green environmental protection new materials, which will have broad development prospects. Conclusion In recent years, the global forest resources have become increasingly exhausted, and the awareness of social environmental protection has been rising day by day, and higher requirements have been placed on the application of wood. Wood-plastic materials are basic industrial raw materials, which can produce a variety of architectural decoration materials that can replace wood, which can save forest resources and protect the environment. The material has the advantages of small specific gravity, high strength, weathering resistance, heat insulation and insulation, and has sufficient raw materials, various varieties, adjustable color, texture close to wood, simple maintenance, significant economic and social benefits, and therefore developed. This new type of green material is extremely realistic and far-reaching. | |
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