Highly transparent polypropylene (HTPP) is an important modification of polypropylene and has a wide range of uses in medical devices, transparent packaging and household products. At present, all kinds of transparent PP grades have become a bright spot in the development of new PP products in the world.
Transparent PP is more distinctive than ordinary PP, PVC, PET, PS, and has more advantages and development prospects. It is understood that the demand for transparent polypropylene in the world is growing at a rate of 5% per year. It is estimated that the market demand will reach 200-2.5 million tons by 2005.
If PET transparency is defined as 100%, high transparency PP can be over 80%, and metallocene polypropylene (mPP) random copolymer transparency can reach 96%. Compared with ordinary PP, the appearance, heat resistance and rigidity of high-transparent PP products have been improved. Therefore, PVC, PS, PET, etc. are gradually replaced, which are widely used in household products, packaging products, medical equipment, etc. , greatly expanded the application field of PP.
In recent years, the foreign transparent PP market has grown rapidly. It is expected that the demand for transparent PP special materials in foreign markets will be about 5 million to 5.5 million tons in 2005.
China's research and development of transparent PP started late, and the production method is mainly to add transparent modifier in PP. There is still a big gap between foreign research and application development of transparent agent technology and high transparent PP product types and market applications. The market application is limited to the field of low value-added plastic products such as films, sheets, transparent cups, microwave cookers and disposable tableware.
Beijing Yanshan Petrochemical Company began research and development of high-transparency PP technology and its products in 1993, and then industrialized production on its PP equipment. With the method of adding nucleating agent, K4818, K4808, K4902 and other grades have been developed, and the performance and application of the products are in a leading position in the domestic injection and blowing field.
Shanghai Petrochemical Company successfully developed high-transparent PP in 1997. At present, the company's homopolymeric transparent PP, random copolymer transparent PP main brands are M250E, M450E, M800E, M1200E, M3000E and M250T.
Yangzi Petrochemical Company added a composite transparent auxiliaries based on PPF401 powder produced by N catalyst on its 160,000 ton/year PP production unit in August 2000 to produce a highly transparent PP grade J301G. At present, Yangzi Petrochemical Company has set the series of grades for the development of ordinary grade random copolymer PP transparent product machine as its current research and development focus, and developed two new grades PPT800 and PT2000.
TJTM-8020, a transparent PP special material independently developed by Tianjin Petrochemical Company's ethylene plant, was put into industrial production in March 2003. In addition, Guangzhou Petrochemical Company, Ningbo Huasheng Company, Shanghai Taopusi Company, etc. are also developing transparent PP.
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