Plastic Wood Materials Unique Additives
At present, various countries in the world have carried out comprehensive treatment of various waste plastic pollution, and have achieved certain results, among which wood powder or plant fibre filled, through special equipment extrusion, pressing or injection moulding, can be used in some occasions to replace wood products plastic products especially practical. The result is a new practical technology with rapid development and remarkable economic benefits in foreign countries in recent years. It can be widely used in the packaging, construction and other industries. The development and research of wood powder and waste plastic composite materials can not only provide the opportunity to make full use of natural resources, but also reduce the environmental pollution caused by waste plastics. Therefore, this kind of plastic wood composite material is a kind of green environmental protection material that can save energy and protect the environment. Its application scope is also very wide, mainly used in building materials, automobile industry, packaging and transportation of goods, decorative materials and daily life utensils and other aspects, has a broad development prospect. As an organic filler of plastics, the wood powder has many excellent properties that cannot be matched by other inorganic fillers: wide source, low price, low density, good insulation and low wear to processing equipment. However, it has not been widely used like inorganic fillers, mainly because of poor compatibility with the matrix resin, poor dispersion effect in molten thermoplastic, poor fluidity, and difficult extrusion moulding. With the continuous development of plastic wood technology and the increasing demand for environmental protection, plastic wood technology has been mixed with the single component of waste plastic and wood powder to produce plastic wood products, which is a transition to the mixed production of plastic wood products with multi-component waste plastic and wood powder. Because the main component of wood powder is cellulose, which contains a large amount of hydroxyl, these hydroxyl groups form intermolecular hydrogen bonds or intramolecular hydrogen bonds, making wood powder water absorbent, moisture absorption rate up to 8% ~ 12%, and strong polarity. However, most of thermoplastic plastics are non-polar and hydrophobic, so the compatibility between them is poor and the adhesion force of interface is small. Using appropriate additives to modify the surface of polymer-wood powder can improve the interface affinity between wood powder and resin, and the modified wood powder filler has the property of strengthening, which can transfer the stress between filler and resin well, so as to enhance the strength of composite materials.