October 26, 2021
In the early stage, propylene polymerization can only obtain paper products with oligomeric degree, which is an amorphous compound and has no practical value. In 1954, Ziegler and Natta invented ziergler Natta catalyst and made crystalline polypropylene with high stereoregularity, which is called isotactic polypropylene or isotactic polypropylene. This research achievement has opened up a new direction in the field of polymerization and laid a foundation for the large-scale industrial production of polypropylene and its wide application in plastic products and fiber production.
In 1957, Montecatini company of Italy first realized the industrial production of polypropylene. From 1958 to 1960, the company used polypropylene for fiber production and developed polypropylene fiber with the trade name of meraklon. Later, the United States and Canada also began production one after another.
After 1964, polypropylene film splitting fiber for bundling was developed and made into textile fiber and carpet yarn by film fibrillation.
In the 1970s, the production process of polypropylene fiber was improved by short-range spinning process and equipment. In the same period, expanded continuous filament began to be used in carpet industry. At present, 90% of the carpet floor cloth and 25% of the carpet veil in the world are made of polypropylene fiber.
After 1980, with the development of polypropylene and new technology for manufacturing polypropylene fiber, especially the invention of metallocene catalyst, the quality of polypropylene resin has been significantly improved. Due to the improvement of its stereoregularity (isotacticity up to 99.5%), the internal quality of polypropylene fiber is greatly improved. In the mid-1980s, polypropylene fine fiber replaced some cotton fibers and was used in textile fabrics and nonwovens. With the development of one-step BCF spinning machine, air texturing machine and composite spinning machine, as well as the emergence and rapid development of nonwovens, the application of polypropylene fiber in decoration and industrial use has been further expanded. In addition, the research and development of polypropylene fiber all over the world is also quite active. The popularization and improvement of differentiated fiber production technology has greatly expanded the application field of polypropylene fiber.