The Synthesis Research Of Modified Silicone Softener

Modified silicone is synthesized by introducing other reactive groups to silicone molecular chain, thus different active groups endow the fabric with different characteristics. Common characteristics of these silicone softeners are: increasing the affinity between silicone and fiber, while giving the fibers more new features. In this paper, epoxy-modified silicone and carboxyl-modified silicone are synthesized. The main experiments and results are as follows:(1) Hydrogen silicone is synthesized by D4 and HMM with the catalyst of concentrated sulfuric acid. By single factor experiment, optimum process conditions are obtained as follows: reaction temperature is 50 ℃, reaction time is 8 h, amount of catalyst is 3 %.(2) Epoxy-modified silicone is synthesized by hydrogen silicone and epoxy-allyl polyether. Using chemical titration to test product hydrogen content, this experiment calculated hydrogen silicone Si-H conversion, namely reaction conversion rate. With single factor experiments and central composite design experiments, optimum conditions are obtained as follows: reaction temperature is between 100-110 ℃, the reaction time is between 7-8 h, material ratio of Si-H and C=C is 1:1.1. On this condition, the epoxy-modified silicone conversion rate reaches 91.1 %.(3) Ester-modified silicone is synthesized by hydrogen silicone and methyl methacrylate. Using chemical titration to test product hydrogen content, this experiment calculated hydrogen silicone Si-H conversion, namely reaction conversion rate. With single factor experiments and central composite design experiments, optimum process conditions are obtained as follows: reaction temperature is 132 ℃, the amount of catalyst is 6.4 ‰, material ratio of Si-H and C=C is 1:1.3, the reaction time is 12.6 h. On this condition, the ester-modified silicone conversion rate reaches 90.7%.(4) Carboxyl-modified silicone could be synthesized by hydrolyzing ester-modified silicone. With single factor experiment and orthogonal experiment study, optimum process conditions are obtained as follows: the reaction time is 120 min, the reaction temperature is 90 ℃, alkali concentration is 20%. On this condition, the hydrolysis of the ester-modified silicone is 82.8 %.(5) Complexing two modified silicone oils, when the quality of epoxy-modified silicone and carboxyl-modified silicone is 2:1 or 3:1, the fabric softness and smoothness gets good level, and hygroscopic changes a little.