New Green Building Material - Wood Plastic

Wood plastic is a new type of green building material. Because the product itself has excellent anti-corrosion, anti-moth, waterproof and physical and mechanical properties and can be nailed, saw the secondary processing performance, plus the basic production of raw materials can be used to return to the heart The waste plastics and crop residue, the product price is cheaper, so many countries have invested more efforts to develop. The Canadian ONYX company established three production lines in Toronto in 1997. The production capacity of each production line was approximately 1,000 tons/year. The following year, the production capacity expanded to 13 production lines, and in 1999, it reached 43 production lines. The United States TIMTECH company from the original production of wood-plastic trays to produce high value-added building insulation board, and increased investment of 35.64 million US dollars, plans to build 66 production lines for the production of insulation board.

Wood-plastic products have a wide range of uses. At present, our country is mainly used for doors and windows, forms, floors, ceilings and roofs in the construction field, handling plates and pallets in the packaging field, railway sleepers in the transportation sector and noise barriers for highways.

Construction is China's pillar industry. The Ministry of Construction predicts that as of the 10th Five-year Plan period in China, the annual completion area of ​​buildings will be approximately 1.185 billion square meters. Each year, about 3.2 million cubic meters of formwork wood are needed for construction. Due to the shortage of timber in China, the number of joints in the wooden formwork is poor, the flatness is poor, the deformability is large and the number of uses is only 1 to 5 times. After the 1970s, the steel was changed to steel. The template, the current annual demand for steel templates is about 5000-6000 square meters. Because the steel template is very heavy, it is easy to bond with the surface of the crucible and the same as the wood form, the requirement of the concrete clean wall cannot be achieved. In October 1994, the Ministry of Construction and other six departments jointly proposed to promote the use of steel framed bamboo plywood throughout the country to replace the existing steel formwork in order to save costs and improve quality, and proposed that the replacement rate by 2010 should reach 40%.

However, the annual production volume of bamboo bonded templates in China is only about 170,000 cubic meters, which is far from meeting the requirements. Therefore, the use of promotional bamboo templates at the same time, the search for new types of high-performance, low-cost building templates is a top priority, and wood-plastic template is the best choice. According to the relevant test results, the properties of the WPC template can meet the requirements of the construction template, in particular, there is no water absorption deformation and thickness tolerance, no adhesion to the crucible surface and impact resistance and corrosion resistance, the high dimensional stability is other materials Unmatched. Therefore, it is the best choice for the development of architectural templates for wood-plastic products, from the use of function and cost to the materials of existing templates.

Wood-plastic products are ideal materials for modern wooden sleepers. Most railways in the modern world are still the preferred timber. Until the end of the 1990s, they still accounted for 75%. Because of the scarcity of wood resources in China, the prestressed reinforced concrete sleepers have been used for many years. About 70% of the railways in the country use sleepers. Due to the speed increase of the train, the rails are affected by the dynamic load of the locomotives, and the sleepers have large undulations. The rigid materials on the rail sleepers have a great impact on the track bed and can easily break and pulverize the ballast, resulting in tumbling and mud. Affect the stability of the line. Therefore, the pillows and bridge pillows used in railways in China have always used wooden pillows. It is predicted that in the first 10 years of the 21st century, the amount of railway wooden pillows in the country will reach 800,000 cubic meters. After 2010, high-quality wooden pillows will exceed 1 million cubic meters, and will increase to more than 5 million cubic meters. There is a shortage of timber in China, and wood-plastic products are ideal alternatives to wooden sleepers. Wood-plastic products have higher anti-corrosion performance and impact resistance than wood, thus further reducing the cost of wood-plastic products. As a railway sleeper, there will be a broad market prospect.

Tray is an extremely wide range of products for the storage and transportation of goods. The annual output of our country is about 100 million, the output value is nearly 1 billion yuan, and about 90% of pallets are wood products. China's timber resources are limited. The use of wood pallets is undoubtedly a destruction of China's forest resources, use wood-plastic trays, its performance in all aspects is better than wood, its low price, but also conducive to environmental protection.