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What is the role of fluoropolymers in three-proof finishing agents?



What is the role of fluoropolymers in three-proof finishing agents? Water-repellent and oil-repellent agents can change the surface properties of fabrics, making them less likely t…

What is the role of fluoropolymers in three-proof finishing agents?

Water-repellent and oil-repellent agents can change the surface properties of fabrics, making them less likely to be wetted or stained by water, oil, and stains. They are currently widely used in workwear fabrics, daily fabrics (umbrella fabrics, cotton tents, and kitchen fabrics). cloth, table cloth, decorative cloth), industrial cloth, labor protection cloth, military cloth and other fields.
Organofluoropolymers can reduce the surface energy of fabrics to a level where oil, water, and stains cannot penetrate and penetrate the fibers. The best finishing effect of this effect is that the organic fluoropolymer can form a seamless invisible protective film that wraps the fibers. The organic fluoropolymer entangled in the liquid solvent-free state expands on the fiber surface during film formation, and the fluorine-containing side chains straighten and orient under the action of heat during drying. At the same time, the polymer is firmly bonded to the fiber through reactive groups or under the action of end-blocked isocyanate accelerators.

Among the many three-proof finishing agents, finishing agents based on fluorosurfactants have the best effect. They are all organic fluoropolymers with fully fluorinated or partially fluorinated side groups. The backbone main chain itself does not contain fluorine, but it is the carrier of important characteristics of the polymer, affecting the formation, hardness and fabric properties of the polymer film. The fastness on the fabric matrix, while the perfluorinated or partially fluorinated side groups are reactive and can firmly fix the polymer to the fabric matrix at high temperatures, making it difficult for oil, water and stains to infiltrate and penetrate the fiber. .
Countries are very active in the research and development of this fluorine-containing multi-functional finishing agent. The American 3M Company and DuPont Company, the Swiss Clariant Company, Japan’s Asahi Glass Co., Ltd. and Daikin Industrial Co., Ltd., and the French Atoehem Company have all developed corresponding products. Our country has been researching it since the mid-1960s. However, the perfluoroalkyl products used as raw materials so far have been imported, and the domestic preparation technology is not yet mature. According to incomplete statistics, there are currently more than 70 companies in the country that organize and produce this type of products, with an annual output of 11,000 to 12,000 tons. They basically adopt the following methods: ① further produce new products based on imported original goods; ② Imported 121 original products are diluted; ③ Imported original products are simply compounded; ④ Products of foreign companies are sold on a consignment basis. Only 3% to 4% of enterprises have introduced foreign production technology to produce their own products. In addition, 5% to 6% of the products on the Chinese market are directly sold by foreign companies.

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