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Influence Of The Structure Of Organic Fluorin Water-and Oil-proof Agents On Property

Posted on:2006-11-17Degree:MasterType:Thesis
Country:ChinaCandidate:Y Y LiFull Text:PDF
GTID:2121360152991904Subject:Applied Chemistry
Abstract/Summary:PDF Full Text Request
in this paper, four different water- and oil-proof agents based on raw materials' accommodation in national market were designed and were synthesized. Through experiment, the better reactive conditions were obtained. Such structures may influence water- and oil-proof, film forming, softening and smoothing properties and were evaluated for their effect. It was also evaluated the content of perlluoroalkyl groups, the concentration of treating solution, baking time and baking temperature had effect on water- and oil-proofing and other properties when fluorochemical structure was the same. And the four water- and oil-proof agents were applied to fiber and fibric. Moreover, the relation of the structure and the properly of water- and oil-proof agents and their mechanism of action were studied. So this research not only supplied basis for preparing fluorochemicals with different functions, but also helped to know about their mechanism of action and develop fluorochemicals.This result indicated that the four fluorochemicals all had low surface energies. PF, SiOF and SiNF were fit to resist water. However, for the film of SiHF water contact angle was smaller. The Zisman critical surface tension for PF, SiOF, SiHF and SiNF were lower than the surface tension of water and oil. Among them, the lowest value was 15.5mN/m of SiHF. When the content of perfluoroalkyl groups of PF and SiHF were more than 65.01% and 66.60% accordingly, level of oil proofing almost was the same regardless of the fluorine content and was satisfied with oil proof demand. This was led from the strong packing of perlluoroalkyl groups and showed that perfluoroalkyl groups was oriented and parallel to one other and normal to the substrate surface. High oil repellency was not simply because its fluorine concentration at the surface was high, but because the reorientation took place and the degree of surface coverage was high. So SiNF charactered "low content and good properties".The applied properties of four fluorochemicals were tested. These results indicated that all fluorochemicals imparted to fibers good resistance to water. The treated fibers with SiNF showed good oil repellency of 6,but the treated fiberswith the other Ihiorochemicals only showed a poor to 0~l level of oil repellency. The lour polymers had good film forming property. Their film forming property had great effect on water repellency, but didn't influence oil repellency. Moreover, the better film forming property was, the higher level of oil repellency was. Oil repellency of fibers was determined by thickness of molecular film of fiuorochemicals. And while the concentration of treating solution was over 2%, molecular films forming with SiHF and SiNF were available. The fibers treated with SiNF are very soft, smooth and full, so handle was the best. Handle of the libers treated with SiHF and SiOF was better. Handle with PF was bad. Wash fastness was also tested. The results showed that effect to resist water was durable to washing, but effect to resist oil was decreased.Compatibility tests were made. The results indicated that silicone lluoropolymcrs the pertluoro chains were hanging side chains on a linear block polymer imparted water- and oil-proofing along with satisfactory fell. However, combination perfiuoropolymer with silicone material can severely affect oil proofing and give zero oil proofing ratings. When perfiuoropolymer was combinated with nanometer material, there was a definite synergistic effect.
Keywords/Search Tags:water- and oil-proofing, perfluoroalkyl groups, structure, property, film, low surface energy, contact angle
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