Synthesis And Properties Of Fluoro-waterprooifng Agent For Lerther

Using the fluoroacrylate waterproofing agent coate with the leather, not only gives ahigh waterproof properties, but also to gives a good oil repellency of the leather. At the sametime, the hygiene properties of the leather were maintained, which is the other type ofwaterproofing agent do not possess. The waterproof leather as a high-grade leather has a goodprospect, and research in this area has a good economic and social benefits.The fluoroacrylate copolymer waterproofing agent for leather were prepared by batchand feeding elevation of temperature and delaying addition of initiator. The copolymer weredetermined and characterized by FTIR. The influence of the polymerization process and theamount of the initiator agent and such factors on the monomer conversion were studied. Asthe waterproofing agent for leather, the influence of the content of fluorinated and fumctionmonomer and the concentration of the agent on the oil and water repellency. The washabilityand softness of the coated leather were investigated. Furthermore the surface properties wereanalysised by SEM. The results showed that the monomer conversion rate got to97.2%whenthe initiator content accounted for1%by delaying addition initiator. The waterproof gradewas measured to be9and the oil repellency grade was measured to be6when the fluorinatedmonomer content accounted for62%, the fumction monomer content accounted for2%andthe concentration of the agent accounted for2%. The coated leather could maintained the oiland water repellency grade with excellent washability after washing10times. The softness ofthe leather had little changed before and after which were better maintained.The fluoroacrylate emulsion was prepared from fluorine-containing acrylate as mainmonomer and characterized by FTIR and laser particle size analysis. The effect of thereaction temperature and time in the conversion were characterized. Then the stability of thecopolymer emulsion was tested. Furthermore the influence of monomer and crosslinkercontent on the oil and water repellency of the coated leather were studied, and the treatmenttemperature and surface features were analyzed. The results showed that conversion ratereached97%by reaction for6hours at85℃and subsequent1.5hours at90℃. The averageparticle size was79.9nm of stability fluoroacrylate emulsion. And excellent low surface properties with waterproof grade9and oil repellency6was obtained when theTA-N(fluorine-containing acrylate),2-EHA(2-ethylhexyl acrylate weight)and SA(acrylic acidstearyl ester)ratio of8:3:2and leather coated temperature at50℃.Karstedt catalyst was prepared and with this catalyst fluorosilicone resin wassynthesised to improve performance of fluorine-containing copolymer. The copoymer werecharacterized by FTIR. The influence of catalyst content, reaction temperature, polymeriza-tion temperature and method of adding the reactant on synthesization of copolymer. The oiland water repellency of copolymer on the surface of leather were determined. The resultsshowed that the waterproof grade was measured to be8and the oil repellency grade wasmeasured to be4when using bulk polymerization with catalyst accounted for5ppm, reactionfor6hours at130℃and concentration accounted for2%.