| Recently, with the improvement of modern society, the issue of environmental protection has aroused considerable concern. The restrictions on VOC of environmental regulations are increasingly strict and environmental safety consciousness is paid more attention for people than before. The water-borne polyurethane is used widely in fabric finishing, leather processing and adhesives and so on.In our country, the researches on water-borne polyurethane emulsion developed later and few than abroad. In this paper, the water-borne polyurethane was obtained from toluene diisocyanate (TDI), polyester polyols (polyester-864),2,2-hydroxyl methyl propanoic acid (DMPA), and by prepolymerization, extending chain, the blocking and the decentralization. The experiment synthesized a kind of excellent polyester type water-borne polyurethane, its hydrolytic resistance and film forming are good. When water-borne polyurethane was prepared on the best synthesis condition, siloxane was grafted, then researched the modification process, and the performance of siloxane-modified water-borne polyurethane was improved because the strong structure was formed by siloxane hydrolysis and polycondensation. The series of products were applied in fabric, the influence on performance was discussed.By the research on the selection of polyester raw materials, and polymerization formulations and conditions (R value, prepolymerization reaction temperature and time, chain extending temperature and time, DMPA dosage, neutralization degree etc.), the influence of the reaction rate, production cycle and the product performance was comprehensive considered, in the conditions of minimized adverse reaction, the optimum process was determined:the dosage of DMPA was4.5%, prepolymerization reaction temperature and time were respectvely65℃and2h, meanwhile, chain extending reaction temperature and time were respectively70℃and1h, the neutralization degree was110%. The water-brone polyurethane was modified with organic silicon coupling agent (A110) after chain extending, its temperature and time was45℃and1.5h, the dosage of siloxane was6%. The structure content of unmodified product and modified product have been analyzed by spectroscopy (FTIR), proved that the synthesized products were water-borne polyurethane and organic siloxane modified water-borne polyurethane.When the water-borne polyurethane was applied in the fabric finishing, the optimal processing conditions and the best finishing effect were got by analysis of univariate and multivariate orthogonal experiment and discussed the influence of finishing technological parameters. According to the results:the modified type water-borne polyurethane was applied in anti-wrinkle finishinig, which could advance the wrinkle bomb emergency recovery angle of cotton from87.12°to153.46°and terylene/cotton’s from188.18°to199.62°, the wrinkle slow play recovery angle of cotton from110.46°to174.66°and terylene/cotton’s from211.58°to240.48°; the water-borne polyurethane was applied in anti-cottony pilling finishing could increase the pilling resistance grade of cotton knitted fabric from1grade to3grade; the water-borne polyurethane as pigment printing crosslinking agent applied in coating process, which could raise the dry rubbing fastness of cotton fabric from3-4grade to4-5grade and wet rubbing fastness of dyed cotton fabric from2-3grade to4grade.The water-based polyurethane product is an excellent and eco-friendly fabric finishing agent. After finishing by it, the fabric application performance was improved, the damage of the fabric after finishing was not serious, the whiteness of the fabric dropped unobvious. The water-borne polyurethane should have widely application prospect. |
