Separate plastic and wood have its shortcomings, and put them together is what we call wood-plastic composite material, it not only has good elastic modulus, but also can achieve anti-aging, anti-static, flame retardant, etc. special requirements. After years of scientific and technological personnel efforts in the support of the National Science and Technology Support Program, the modified wood-plastic composite materials technology has been great innovation and achieved gratifying progress.
With the growing shortage of wood resources, prices are getting higher and higher, so the most recent wood-plastic composite materials to biological resources - plant fiber (crop waste) as raw materials. China is a big agricultural country, crop waste is very rich. According to the Ministry of Agriculture statistics, in 2010 China's total straw reached 726 million tons. In the past a large number of residual straw was abandoned in the fields, or directly burned, and now can be used by waste modification technology, made of high-performance wood-plastic composite materials, widely used in construction, transportation, home appliances, automobiles, landscape and other fields.
Dehumidification is an important part, dehumidification is not completely will seriously affect the performance of wood-plastic products. The traditional method of a dehumidification can not meet the technological requirements of wood-plastic products. The new technology to take high-speed mixing of wood fiber dehumidification, dehumidification and dehumidification dehumidification three sections of dehumidification method to overcome the wood fiber is difficult to dehumidification of the bottleneck, so that the water content to meet the extrusion requirements. Wood powder without treatment, directly with the recovery of plastic blends, due to the small interface of the mechanical properties of poor mechanical properties, it must be added after the activation of wood flour additives can be a good adhesion with the plastic. But the use of a single additive also failed to meet the requirements. New technology by adding coupling agent, grafting agent, lubricants, plasticizers, heat stabilizers and other five composite additives can also improve product performance.