Development history of WPCDevelopment history of WPC
The so-called wood-plastic composite material is to inject liquid unsaturated olefin monomers or oligomers and prepolymers into the wood, and then use radiation irradiation or catalytic heating to make these unsaturated olefin monomers or oligomers The material and prepolymer are polymerized in the wood to form a composite material with the wood, which is called wood-polymer composite (Wood-polymer Composite), abbreviated as WPC.
WPC appeared in the early 1960s. Kanega and Karpov in the United States respectively used γ-ray radiation to initiate polymerization of olefin monomers impregnated in wood to produce wood-plastic composites with excellent properties. Since then, many countries have conducted research in succession, and the American Atomic Energy Commission has studied the development of wood-plastic composite materials as an important aspect of the peaceful use of atomic energy. In 1964, wood-plastic composite materials were listed as one of the top ten scientific achievements in the world. At a symposium held in New York in 1965, Yell in the United States published a paper on the introduction of chemical initiators in monomers and the manufacture of wood-plastic composite materials by catalytic heating. In 1966, the American AMF's Bouling branch built the world's first production line for catalytic heating to produce wood-plastic composite materials. The impregnated monomer is MMA (methyl methacrylate). The product is mainly used to make billiard cue. In 1968, the wood-plastic composite material produced by the US ARCO Chemical Company using γ-rays came out, mainly used for making parquet floors. The floor made of wood-plastic composite material has high hardness and strong abrasion resistance. The cigarette burn marks on the floor can be removed by polishing and it is as bright as new, and the floor has a bright color, gorgeous appearance, no paint, and flame retardant function , Especially suitable for crowded public places, such as airports, subways, commercial buildings, ballrooms, etc., its life is usually 8 to 10 times the material floor.
At present, wood-plastic composite materials have been commercialized in the United States, Germany, Japan, Italy, Poland, Taiwan, United Kingdom, France and other countries. For example, in Japan, the catalytic heating method is mainly used for production, and a considerable production capacity has been formed. The products are mainly used as floor boards, which are usually produced as composite floor boards, that is, the 0.5-3mm thick part of the floor surface is wood-plastic composite materials.
In China, research on wood-plastic composite materials began in the mid-1960s. Shanghai University of Science and Technology, Nanjing Forestry University, Northeast Forestry University, Chinese Academy of Forestry, Musical Instrument Research Institute and other units have conducted research in this area. After the monomer is impregnated with wood, the catalytic heating method is used to produce wood-plastic composite materials. The products are used to produce erhu rods, banhu rods and other musical instrument components. The wood-plastic composite materials prepared from basswood can be used to make pipa backboards (the above-mentioned musical instrument components were originally Made of imported mahogany), weather resistance, low moisture absorption, good product quality, erhu pole monthly production record reached 10,000, and production was discontinued in 1979 due to the slow sale of musical instruments. Tsinghua University and Beijing Timber Factory have collaborated on the development of wood-plastic composite materials using gamma-ray radiation. The wood used is poplar. According to reports, after such treatment, the performance of poplar has been greatly improved. At present, due to the high price of chemical raw materials and the difficulty of process control in the production process of wood-plastic composite materials, the production line of wood-plastic composite materials has not yet been established in China.