| In order to improve the crease resistance of silk fabric and reduce the damage to silk fabric at the same time, the ?,?-dihydrogen-poly(dimethyl-hydrogenmethyl)siloxane(H-PDMS-PHMS-H) was synthesized in the thesis firstly and then modified by allyl glycidyl ether or allyl polyether glycidyl ether. The synthetic compounds were applied in crease resistant finishing for silk fabric, the finished silk fabric had greater crease resistance property, higher strength retention rate, lower yellowing etc.Because the multi-epoxy modified polysiloxane was hydrophobic, the preparation of finishing agent liquid need to be added a large amount of emulsifier to emulsify, and the hydrophily of silk fabric was worse after finishing; however, Allyl polyether glycidyl ether modified polysiloxane was a hydrophilic and oleophilic amphiphilic substances, there was no need to add emulsifier to emulsify because it could emulsify by itself during the preparing processes of finishing agent emulsion, and after finishing the hydrophilicity of silk fabric was increased and application properties such as moisture absorption, water absorption, and comfort of silk fabric was maintained, but the wet crease recovery angle of silk fabric increased no obvious.The specific research and results are as follows:The first part: synthesis and characterization of H-PDMS-PHMS-HThe ?,?-dihydrogen-poly(dimethyl-hydrogenmethyl)siloxane was synthesized by ring-opening cationic polymerization of octamethylcyclotetrasiloxane(D4),1,3,5,7-tetramethylcyclotetrasiloxane(D4H) with KHS self-made as catalyzed and dihydrogentetramethyldisiloxane as end capping agent, and characterized by FT-IR,1H-NMR and GPC.The influence of catalyst dosage, temperature and time of reaction on the molecular weight and the hydrogen content of synthesized objects were investigated. The results show the consistent value of molecular weight and hydrogen content of synthesized objects were average up to 90% compared with that of designed object, when being synthesized for 8 hours at 60 ? with 2% the dosage of catalyst KHS(relative mass to the monomer). The research showed that molecular weight and hydrogen content of H-PMHS-PDMS-H were manageable with the self-made catalyst KHS at the optimal synthesis condition through ring-openingcationic polymerization, and at the same time the reaction without nitrogen protection,no special drying treatment.The second part: the synthesis and application of multi-epoxy modified polysiloxane.The multi-epoxy modified polysiloxane was synthesized by hydrosilylation reaction of H-PDMS-PHMS-H and AGE, the influence of synthesis conditions on the double bond conversion were studied, the synthesis condition was optimized and its applicability was verified, the structure of multi-epoxy modified polysiloxane was characterized by FT-IR and 1H-NMR. The results showed the optimal synthesis condition was as follows: the dosage of catalyst was 80 PPM, reaction temperature was 90 ?, reaction time was 4 h. It was confirmed that its applicability was greatly good because that double bond conversion rate was up to 80%, epoxy value was0.2618 mol/100 g which was close to the theoretical value of 0.2676 mol/100 g. the multi-epoxy modified polysiloxane(the molecule weight of H-PMHS-PDMS-H is1558 g/mol) was applied in crease resistant finishing of silk fabric, the anti-wrinkle finishing process conditions was optimized by the single factor experiment and the results were as follows: the concentration of finishing agent was 30 g/L, the catalyst concentration of Na2S2O3 was 5 g/L, curing temperature was 140 ?, the curing time was 4 min. Under the condition and the molecular weight of H-PMHS-PDMS–H was1558 g/mol, the effects of different ratios of D4H/D4 affected on the properties of finishing silk fabric were studied. The results showed that the crease recovery angle of finished silk fabric was largest when D4H/D4 proportion was 1:4, it was greatly good of the dry and wet crease resistance and washing resistance of finished silk fabric.Compared with other commonly crosslinking type crease resistant finishing agent for silk fabrics, the multi-epoxy modified polysiloxane was more ideal crease resistant finishing agent for silk fabric, because of strength retention rate of silk fabric was higher, no yellowing after finishing, but the hydrophily of silk fabric was worse after finishing.The third part: the synthesis and application of multi-epoxy polyether modified polysiloxane.The multi-epoxy polyether modified polysiloxane was synthesized by hydrosilylation reaction of H-PDMS-PHMS-H and allyl polyether glycidyl ether, the influences of synthesis conditions on the double bond conversion were studied, the synthesis condition was optimized and its applicability was verified; the structure of multi-epoxy polyether modified polysiloxane was characterized by FT-IRand1H-NMR. The results showed the optimal synthesis condition was that the dosage of catalyst was 90 PPM, reaction temperature was 80 ?, reaction time was 5 h, its applicability was greatly good because the double bond conversion rate was up to80%, epoxy value was 0.1287 mol/100 g which was close to the theoretical value of0.1316 mol/100 g. the multi-epoxy polyether modified polysiloxane(the molecule of H-PMHS-PDMS-H was 1558 g/mol) was applied in crease resistant finishing of silk fabric, the anti-wrinkle finishing process conditions was optimized by the single factor experiment and the results were as follows: the concentration of finishing agent was 60 /L, the catalyst concentration of Na2S2O3 was 3 /L, curing temperature was140 ?, the curing time was 5min. Under the finishing condition silk fabric had good dry, wet crease recovery angle, especiallydry crease recovery, and no yellowing, the hydrophilicity of silk fabric was increased, the finishedsilk fabric had better moisture absorption, water absorption, but the wet crease recovery angle increase no obvious.To sum up, the silk fabric finished with self-made multi-epoxy modified polysiloxane finishing agent had good wet crease recovery angle and washing resistance, high breaking strength retention rate at the same time, but the preparation of the multi-epoxy modified polysiloxane finishing agent emulsion was needed to add a large amount of emulsifier and the hydrophilic of finished silk fabric declined; the silk fabric finished with self-made multi-epoxy polyether modified polysiloxane finishing agent not only had dry wrinkle recovery angle increased significantly, but also had good hydrophilicity, and without adding emulsifier. But the wet crease recovery angle of the finished silk fabric was not ideal and its wash resistance was poor. |
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