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Preparation Of Amphoteric Phosphatic Surfactant And Its Application In Leather Fatliquor

Posted on:2007-09-06Degree:MasterType:Thesis
Country:ChinaCandidate:H R AnFull Text:PDF
GTID:2121360182991472Subject:Leather Chemistry and Engineering
Abstract/Summary:PDF Full Text Request
The fatliquor which is phosphate ester can resist the acid, alkali and salt, soit can be used in the process of chrome-tannage and chrome-retannage,and theeffect of fatliqour is obvious, the product is soft, plumpy, flexibility andwaterproof. It is combination fatliqours. The fatliquor which is phosphate esterhas been the hotspot because of its excellent capability. Amphoteric phosphateester with amic, phosphate and hydroxyl is high-powered active matter, so it isfit to treat the fibre of leather. The amic,phosphate and hydroxyl can enter intothe leather and can be combine with fibre, so this reaction fatliquor is also fit tofatliquor the free-chrome leather. According to these merits, the amphotericphosphate ester is attached importance by leather industry recent years, andbecomes the hotspot of new fatliquors.In this subject, a new kind of amphoteric phosphate ester surfactant wassynthesized by the fatty acid, N―methyl diethanolamine and phosphorylationagent. The best synthesized method was explored and the property andcapability were tested, and it was used in the fatliquor of leather. This new kindof amphoteric phosphate ester surfactant integrates the all excellentcapabilities of anion phosphate and the cation amic, so it had the more excellentcapability. Moreover, it also had the characteristic of amphoteric surfactant. Forexample, it can cooperate with others surfactant, it had the synergism action, andit had the merits of amphoteric surfactant, such as the low toxicity, thrill andeasy biodegradation. So this new kind of amphoteric phosphate ester surfactantwas value to exploring and research.The alkyl tertiary amine was synthesized by fatty acid and methyl diethanolamine, and the monoester in alkyl tertiary amine was greater than 80%. Thecontents of monoester and diester were determined by high performance liquidchromatography(HLPC), and the structure of the product was charactered by IR.The molecular ratio of reaction materials, time, the dosage of catalyzer and thedosage of carrying water agent were studied, which affected the reactive courseand the content of monoesterquat. The optimized reaction conditions forpreparation of eateramine was confirmed through homogeneous experiments:the molecular ratio of reaction materials was n(MDEA):n(FAT)=2.0:1,thedosage of carrying water agent was 14%,reaction time was 6.5h,the dosage ofcatalyzer was 0.5%。According to principle of phosphorylation, hydroxyl of the alkyl tertiaryamine was modified by phosphorylating agent. The phosphorylating agents P205and polyphosphate were chosen, and the content of MAP by this twophosphorylating agent was contrasted. When the phosphorylating agent was P205,the optimum conditions were obtained by orthogonal test: the molecular ratio ofreaction materials was n(P205):n(OH)=3.0:1,reaction time was 3.0h,reactiontemperature was 75℃。According to this optimum condition, the content ofMAP was 87.5%,and the conversion of P205 was 94.4%.When thephosphorylating agent was polyphosphate, the optimum conditions wereobtained by orthogonal test: the molecular ratio of reaction materials wasn(P205):n(OH)=3.0:1,reaction time was 5.5h,reaction temperature was 80℃。According to this optimum condition, the content of MAP was 89.3%,and theconversion of P205 was 97.2%. From this, the conclusion that the contentof MAP and the conversion by polyphosphate were more than by P2O5was obtained, so the reaction with polyphosphate and hydroxyl matter wasgood for high-purity MAP. Contrasting the reaction by P2O5, polyphosphatewas liquid, it can dissolve each other, so the adding quantity of polyphosphatecan be more,and the conversion and the content of MAP was high, and themethod was more convenient.Therefore, polyphosphate was chosen tophosphorylating agent, and the following research was done.According to national corresponding standard, basic performance offatliquors of FAN was measured in all-round way, such as emulsificationperformance, cream stability, pH value, cream acid proof, salt stability. Byapplied tests, the application characteristic of leather, such as tensile strength,tore intensity and the absorptivity was studied. According to the request of greenleather chemicals, fatliquor sample was carried to biodegradation experimentand discussed the biodegradation performance.Through the above research of PFA, the result shown that amphotericphosphate ester fatliquor accorded with the national index;and PFA is fit to notonly the fatliquor of chrome-leather, but also the free-chrome leather, becausethe amic phosphate and hydroxyl can enter into the leather and can be combinewith fibre. Through the biodegradation experiment of fatliquor, it was the easybiodegraded, and tallied with the developed demands of green chemical.
Keywords/Search Tags:alkyl tertiary amine, esterification, phosphorylation, free-chrome leather, fatliquor
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