In 2003, the total output of plastic pipes in China exceeded 1.8 million tons, a year-on-year increase of 23%. In the early days, PP pipes were mainly used as agricultural water pipes, but the market failed to open due to some problems in early product performance (impact strength and poor aging resistance). With the introduction of foreign advanced technology by Shanghai Plastics and Building Materials Factory, the pipes for conveying cold and hot water produced by imported PP-R materials have been recognized by the market. Many manufacturers have built PP-R pipe production lines, and the prices have also been put into production. The initial 20,000 to 30,000 yuan / t continued to fall, but the PP-R pipe market share in the plastic pipe market is still very low. According to reports, there is still a certain gap between domestic PP-R materials and imported materials, and the quality needs to be improved and improved. According to reports, Korea has developed a new grade of random copolymer polypropylene PP-R 112 for high-pressure water supply pipes. Pipes produced using this grade can be used for 50 years at 20 ° C and 11.2 MPa in an ultra-high pressure state. Plastic pipe is one of the key products for the promotion and application of chemical building materials in China. The Ministry of Construction issued the “Notice on Strengthening the Production Management, Promotion and Application of Copolymer Polypropylene (PP-R, PP-B) Pipes in 2001”, requesting relevant departments. We must do a good job in the production, application and promotion of PP pipes from the raw materials, processing, quality, and use of pipes, installations, etc., in order to better control the quality of PP pipes.
High permeability material
As people's living standards continue to improve, they will inevitably bring about different requirements and changes in culture, entertainment, food, medical care, materials, and home decoration. Many items in the market use transparent materials more and more. Therefore, the development of transparent PP special materials is a very good development trend, especially for PP special materials with high transparency, good fluidity and fast forming, so as to design and process PP products that people love. Transparent PP is more distinctive than ordinary PP, PVC, PET, PS, and has more advantages and development prospects.
In recent years, the foreign transparent PP market has grown rapidly. For example, South Korea LG has introduced transparent PP as a PET substitute to the market; some companies in Germany have replaced PVC with transparent PP; the growth rate of US transparent PP products is 7% higher than that of ordinary PP products. ~9%; In recent years, the annual dosage of PP nucleating transparent agent in Japan is about 2000t. If the dosage is 0.25%, the annual output of Japanese transparent PP material can reach more than 800,000 tons. According to Japan's Physicochemical Co., Ltd., Japan's transparent PP special materials are used in microwave cookers and furniture. In 2005, the demand for transparent PP special materials in foreign markets was about 5 million to 5.5 million tons. At present, the gap between domestic transparent PP special materials and foreign countries is large, and the production and application of transparent PP resin and its products still need to be strengthened.
