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Propylene polymer. English abbreviation PP. The structure has a melting temperature of about 174°C and a density of 0.91 g/cm3. High strength, high hardness, wear resistance, bending fatigue resistance, heat resistance up to 120°C, good wet and chemical resistance, easy processing and molding, low price, so it is large in output (the world's annual output in 1990 was more than 5 million tons) , Widely used general-purpose polymer varieties. The disadvantages are poor low temperature toughness and resistance to aging. In recent years, improvements have been made by methods such as copolymerization and blending.
Monomer propylene is obtained by separation and purification of petroleum cracking or refinery tail gas. The purity should be above 99.5%. A small amount of impurities can poison the catalyst. Polymerization methods include slurry, liquid phase bulk, and gas phase polymerization. The latter two are dominant. The catalyst is often a Ziegler-Natta type, such as δ-TiCl3-(C2H5)2AlCl or TiCl3-(C2H5)Al, with an efficiency of 300-900 g polypropylene/g TiCl3. In recent years, a titanium-aluminum system using MgCl2 as a carrier and benzoate is added, and the efficiency is as high as 70 to 100 kg of polypropylene/g of titanium, and the post-treatment process is avoided.
Polypropylene Plastic Products Polypropylene can be molded by injection, extrusion, blow-molding, laminating, melt-spinning and other processes. It is also suitable for biaxial stretching. Widely used in the manufacture of containers, pipes, packaging materials, films and fibers, but also commonly used reinforcement methods to obtain excellent engineering plastics. It is widely used in automobiles, construction, chemicals, medical appliances, agriculture and household products. Polypropylene fiber's Chinese trade name is polypropylene. The strength is similar to that of nylon and the price is low. It is used to weave carpets, filter cloths, cables, woven bags and so on.