Prcperation Of Epoxy Terminated Silicone And Its Application In Crease-resist Finishing Of Silk Fabric

In order to reduce the strength damage of the finished silk fabric for crease-resistant, the epoxyterminated polysiloxane was synthesized as a crosslinking agent firstly, and appilied tocrease-resist finishing for silk fabric, the finished silk fabric had good wet crease resistance andhigher strength retention rate. However, the epoxy terminated polysiloxane was hydrophobicmaterial, so a great amount of emulsifier was needed for emulsifing the finishing agent, and thedosage of finishing agent also needed to be large. Besides, the hydrophilicity of the finished silkfabric was decreased at the same time. So as to reduce the dosage of finishing agent and keep thehydrophilicity of the finished fabric, the epoxy terminated polyether modified polysiloxane wassynthesized, and applied to crease-resist finishing for silk fabric. When being applied as acrease-resist finishing agent for silk fabric, the epoxy terminated polyether modifiedpolysiloxane could self-emulsify, and could gather on the interface by its surface activities andbe absorbed on the surface of silk fabric, so the effective of the dosage of finishing agent wasimproved. Being finished with the epoxy terminated polyether modified polysiloxane, the silkfabric had both of good dry-crease resistance and hydrophilicity, and the moisture and waterabsorption properties of the finished silk fiber were retained preferably, but the finished silkfabric had not satisfied wet-crease resistance. In order to improve the crease resistance of silkfabric further, on the basis of the above study, the hydrophobic epoxy terminated polysiloxaneand hydrophilic epoxy terminated polyether modified polysiloxane were compounded andapplied to crease-resist finishing for silk fabric. The detailed contents and results of research areas follows:Part one: The synthesis and application of the epoxy terminated polysiloxane. The epoxyterminated polysiloxane was synthesized by the hydrosilication reaction with the hydrogensilicone and allyl glycidyl ether (AGE) as raw materials, and the structure was characterized byFT-IR,1H-NMR and GPC. The influence of synthesis factors on double bond conversion ratewas studied, the synthesis condition was optimized, and the applicability of the optimizedsynthesis condition was verified. The results indicated that the optimal reactive condition wasfollows: the dosage of catalyst was60ppm, the reaction temperature was85℃, and the reaction time was3h. Under the condition, the double bond conversions rate of synthetic reactions atdifferent relative molecular mass of hydrogen silicone reached at87%all, it showed that theabove synthesis condition had wide applicability. The structure of epoxy terminated polysiloxanewas characterized by FT-IR,1H-NMR and GPC. When the epoxy terminated polysiloxane wasapplied to crease-resist finishing of silk fabric, the influence of emulsion particle sizes and molarmass of polysiloxane segment on properties of the finished silk were studied. The results showedthat the smaller particle size emulsion was, the bigger wrinkle recovery of the finished fabric was,with the increased of the relative molecular mass of polysiloxane segment, the wrinkle recoveryof the finished fabric increased at first and decreased at last, when relative molecular mass of thepolysiloxane segment was1200g/mol, the wrinkle recovery of the finished fabric was biggest.The influence of the crease-resist finishing process condition on finishing effects was researchedthrough the single factor experiment, the optimal condition of finishing process was that thedosage of emulsion was60g/L, the dosage of the Na2S2O3as catalyst was4g/L, the curingtemperature was130℃, and curing time was5min. Under the condition, the finished fabric hadgood crease resistance (especially wet-crease resistance) and washing resistance. Compared withother finishing agents, the fabric finished with the epoxy terminated polysiloxane had higherstrength retention rate, and no yellowing. So the epoxy terminated polysiloxane was a goodcomprehensive wrinkle resistant finishing agent.Part two: The synthesis and application of the epoxy terminated polyether modifiedpolysiloxane. The epoxy terminated polyether modified polysiloxane was synthesized by thehydrosilication reaction with the hydrogen silicone and allyl polyoxyethylene polyoxypropyleneepoxy ether as raw materials, and its structure was characterized by FT-IR,1H-NMR and GPC.The influence of synthesis factors on double bond conversion rate was studied, the synthesiscondition was optimized, and the applicability of the optimized synthesis condition was verified.The results indicated that the optimal synthesis reaction condition was follows: the dosage ofcatalyst was40ppm, the reaction temperature was75℃, the reaction time was3.5h, and thesolvent dosage was30%; Under the condition, the double bond conversion rate of syntheticreactions reached at82%all, it showed that the above synthesis condition had wide applicability.The structure of epoxy terminated polyether modified polysiloxane was characterized by FT-IR,1H-NMR and GPC. When the epoxy terminated polyether modified polysiloxane was applied to crease-resist finishing of silk fabric, the influence of molar mass of polysiloxane segments onsurface activitie of the finishing agent and the properties of the finished silk were studied. Theresults showed that the finishing agent had good surface activities, and with increasing ofpolysiloxane segment chains, the saturated adsorption capacity of finishing agent on the surfaceof silk fabric decreased. When the molar mass of polysiloxane segment was726g/mol, thewrinkle recovery of the finished fabric was biggest. The influence of crease-resist finishingprocess condition on finishing effects was researched through the single factor experiment, theoptimal condition of finishing process was that the dosage of finishing agent was5g/L, dosageof the Na2S2O3as catalyst was1g/L, curing temperature was140℃and curing time was5min.Under the condition, the finished fabric had good crease-resistance (especially dry-creaseresistance). Compared with the hydrophobic epoxy terminated polysiloxane finishing agents, thedosage of the finishing agent was decreased and the hydrophily of the finished fabric wasincreased obviously, except that the finished fabric had better dry-crease resistance.Part three: Compound of epoxy terminated silicone and its application on crease-resistfinishing of silk fabric. In order to improve crease resistance property of silk fabric further, baseon the study of crease-resist finishing for silk fabric with the epoxy terminated polyethermodified polysiloxane, in order to improve its wet-crease resistance and washing resistance,theepoxy terminated polyether modified polysiloxane (DEPEO-Si) were compounded with theepoxy terminated polysiloxane (DEP-Si), and applied to crease-resist finishing of silk fabric, theinfluence of the ratio of the dosage of DEPEO-Si and the dosage of DEP-Si was studied. Theresults showed that when the mass ratio of DEPEO-Si and DEP-Si was1:2, the wrinkle recoveryof the finished fabric was biggest. The influence of crease-resist finishing process factors onfinishing effects was researched through the single factor experiment, the optimal condition offinishing process was that the dosage of the Na2S2O3as catalyst was2g/L, curing temperaturewas140℃and curing time was5min. Under the condition, the finished fabric had good dryand wet-crease resistance, strength retention rate, washing resistance and no yellowing.Compared with the single epoxy terminated polyether modified polysiloxane finishing agent, thesilk fabric finished with the compounded finishing agents had much better washing resistance,and its wet-wrinkle recovery angle was improved20°.In conclusion, the silk fabric finished with the self-made hydrophobic epoxy terminated polysiloxane had good wet-crease resistance and washing resistance, high strength retention rateat the same time, but the hydrophilic of the finished fabric was decreased, and the dosage of thefinishing agent was big; However, the silk fabric finished with the self-made hydrophilic epoxyterminated polyether modified polysiloxane had not only good dry-crease resistance, but alsogood hydrophilic with less dosage of finishing agent, but had not satisfied wet crease resistanceand washing resistance. As a result, the above two kinds finishing agents were compounded andapplied to anti-crease finishing for silk fabric. After being finished, the fabric had both theadvantages of above two finishing agent, and the comprehensive effect of crease-resist finishingwas further improved. So the compound of self-made hydrophobic and hydrophilic epoxyterminated silicon was ideal crease-resist finishing agent for silk fabric with good anti-creaseproperties and prospects for development.