Chemical fiber refers to those fibers that have been chemically processed from natural or synthetic high polymers. They can be classified into two types: man-made fibers and synthetic fibers. There are two types of man-made fibers, namely man-made cellulose fibers (such as viscose fiber, rich and strong fibers, etc.) and artificial protein fibers (such as soybean fiber, peanut fiber, etc.), while the synthetic fiber camp is relatively large, with polyester fiber (ie polyester). ), polyamide fiber (nylon 6, nylon 66, etc.), polyacrylonitrile fiber (acrylic fiber), polyvinyl formal fiber (Vinyl), polypropylene fiber (polypropylene), polyvinyl chloride fiber (chlorinated fiber), polyamino Formate fiber (spandex). The composition contains more than 85% of the polyurethane. The trade names are Lycra (United States, United Kingdom, United Kingdom, Netherlands, Canada, Brazil), Neolon (Neolon, Japan), Doralan (Dorlastan, Germany). Wait. First, it was successfully researched by Bayer in Germany in 1937. DuPont started industrial production in 1959 and has now sold its spandex industry to the Koch Industries Group, with a total capacity of about 100,000 tons. The global spandex production capacity is about 600,000 tons, and South Korea Hyosung's spandex production capacity is close to 120,000 tons, making it the world's number one. The first spandex company in China was the Yantai Spandex Factory, which began production in 1989. China's current production capacity is about 350,000 tons, making it the world's largest producer of spandex.
There are two varieties of spandex, one is an inlaid copolymer of aromatic diisocyanate and a polyester segment containing hydroxyl groups (referred to as polyester spandex), and the other is inlaid with aromatic diisocyanate and polyether segment containing hydroxyl group. Copolymer (referred to as polyether spandex). Spandex fibers and elastic polyolefin fibers and elastic composite fibers are collectively referred to as elastic fibers.
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