Synthesis and application of cationic reactive polyurethane fixing agent
Three kinds of chain extenders of multi-tertiary amine chain segments with-OH terminal group are synthesized with reaction of N-methyl-diethanolamine and toluene diisocyanate.Cationic reactive type polyurethane color fixing agents are prepared by chain extension reaction of isophorone diisocyanate and polyethylene glycol (PEG) with the above chain extenders followed by blocking reaction of-NCO groups,and then are applied to fixation of cotton reactive dyeings.The optimum synthesis parameters are:R =2.0,molecular weight of PEG =1 000 and the number of cationic groups in the multi-tertiary amine segment =4.The wet rubbing fastness of cotton reactive dyeings can be improved by about 1 level.
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维普
