In the wood-plastic composite materials, research focus is now mainly concentrated in the polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS) and other thermoplastic and wood flour, straw powder plant More species and other wood shell powder as raw materials, composite materials by extrusion, injection molding, compression molding made of. From the production of raw materials, the raw material of WPC can be all kinds of waste plastics, waste wood and crop residue. Therefore, the development and application of a wide range of wood-plastic composite materials, help to reduce plastic waste pollution, but also help to reduce the burning of agricultural wastes to the environment caused by pollution. Production and use of wood-plastic composite materials, the surrounding environment will not distribute harmful to human health volatiles, the material itself can be recycled, it is a new green products, but also an ecologically clean composites.
Thermoplastic Wood Plastic Composites (WPC) is the use of wood fiber or plant fiber filling, reinforced by pressing compound melt extrusion and other modified thermoplastic material made of different processing methods. In recent years, with the global resources are depleting, social awareness of environmental protection has become increasingly high, wood products and petrochemical applications put forward higher requirements. In this context, wood plastic composite material that can not only play the advantages of each component, to overcome the limitations of use due to the low strength of wood, large variability of organic materials and low modulus of elasticity caused, but also make full use of wood and plastic waste, reduce environmental pollution. Currently, the value-added products improve the material become more and more widespread attention.
At present, foreign aid has been added to the WPC were studies, such as to improve the strength of the coupling agent, a lubricant, a light stabilizer, an antibacterial agent, water, chemical blowing agents and the like. Development of these ancillary products has caused many scientists attention, and made some progress. U.S. Patent reported, adding the dye in wood composite materials may make it long-lasting anti-fading capability, and has been the advent of color wood-plastic composites. Research also shows that hydrocarbon quaternary ammonium salts such as carboxylate, sulfate, etc., can have antibacterial properties of wood-plastic composites. Surface radiation treatment of wood powder technology has become a new hotspot. In addition, these studies will further expand the scope of application of WPC.

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