wood plastic composite

WPC (WoodPlastic Composite, WPC) refers to the use of wood fiber or plant fiber filled, reinforced modified thermoplastic material. Compared to wood, WPC can be continuously extruded, it is possible to obtain an arbitrary cross-section; good dimensional stability and accuracy, almost no waste; WPC can be used with the same method for processing of wood, so the outdoor maintenance costs are very low; for more beautiful, can give WPC painting, it should be easier than the vast majority of plastic; another WPC outdoor durable than cork is better use of time is expected to be 25 to 30 years.
Thermoplastic matrix mainly PE, PP, PS and other polyolefins and PVC, including new materials, recycled materials and mixtures of the two; there is waste wood fiber wood flour, wood shavings, wood sawing; other plant fibers treated smash the rice straw, peanut shells, coconut shells, sugar cane, flax, Ze linen, jute, hemp, etc. Waste wood from trees obtained collapse or necrosis, can also be recovered from the traditional wood processing. Wood fiber and plant fiber molding equipment wear small, good dimensional stability, excellent electrical insulation, non-toxic, can be repeatedly processed biodegradable. Visible, research WPC preparation and processing of a huge environmental and economic significance, and its applications are broad prospects.
Although the mechanical properties of wood-plastic composites are better than wood, but mostly as a non-structural materials TWPC. Construction and construction applications, can be very important in a variety of environments to maintain the desired mechanical properties. Some corrosion in marine environments 2 years TRIMAX WPC (HDPE class) to do performance testing found no deformation or cracking warpage, dimensional changes are manufacturers indicated within the allowable range, the modulus and strength of the material only small change. Fatigue test, because the wood components will heat up, and the plastic is sensitive to temperature, so the fatigue properties of wood materials are difficult to test. Screw coupling strength of WPC increases with decreasing temperature.
WPC Board Supplier in India
Wood is a polar hydrophilic substances, mostly non-polar hydrophobic thermoplastic polymer material, it is necessary to take various measures to improve wood – plastic interface compatibility. Current methods used are: the wood acetylation process or stearic acid, poly (methyl methacrylate) processing, maleic anhydride and the like. In addition, as the vast majority of the wood is a state with a powder or short fiber thermoplastic composites, which are difficult to mix easily understood generate hairball-like, while the polar and non-polar plastic fiber hardly compatible glue, causing poor mechanical properties of the composite. Therefore, WPC biggest problem in production than there is in addition to compatibility issues dispersion. The compatibilizing agent can improve wood fiber in the polyolefin resin dispersibility, and coupling agents can improve adhesion between the wood fibers and the resin, it is possible to improve the tensile strength of wood fiber plastic composites, flexural strength and impact strength ; reduce water absorption wood fiber plastic composites; improve retention of mechanical properties of wood fiber thermoplastic composites under wet conditions and heat distortion temperature. Coupling agent for WPC are silane coupling agent, a titanate coupling agent.
WPC Board Manufacturers in India
Principle is generally considered acetylated fiber component is a hydroxyl group the reaction with acetic anhydride. Since the wood fibers tightly packed, there is a strong crosslinks hydroxyl crystalline regions is completely non-contact, and therefore only reacted hydroxyl fiber components (lignin, hemicellulose and amorphous fibers) small part. Acetylation of the timber can be reduced swelling in water, the water-absorbing natural fibers greatly reduced, improving the interfacial shear strength, increase the fiber surface free energy. Fiber content is 80 ~ 90w t%, acetylation can improve the dimensional stability. Stearic acid as an adhesive fiber surface modification can. With the use of a carboxyl group COOH esterified hydroxy fibers, thereby reducing the number of hydroxyl groups bonded with water. In addition, long hydrocarbon chains of stearic acid is a hydrophobic group, to provide special protection for the fiber.
With a silane coupling agent on the wood fibers after treatment, and then a graft of methyl methacrylate monomer, while MMA appropriate polymerization method of the wood fibers is modified. Generally accepted that the MMA monomer at room temperature better than a vacuum impregnation of wood fiber impregnation under non-vacuum conditions. However, if the use of methanol as a solubilizer MMA expansion, can greatly improve the grafting yield, tensile strength, flexural strength and compressive strength, and can obtain a similar effect with the vacuum conditions.
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