Synthesis and application of hyperbranched amino modified polysiloxane

A hyperbranched amino modified polysiloxane was synthesized via ring-opening reaction of epoxy,with polydimethylsiloxane double-terminated with epoxy groups and diethylenetriamine as raw materials,and the modified polysiloxane emulsion was prepared. The effect of synthesis process factors on the conversion rate of epoxy was researched,the effect of the relative molecular weight of the polysiloxane chain segment on the properties of the emulsion of modified polysiloxane and its finished fabric was studied,the synthesis process condition was optimized,and the properties of the emulsion of modified polysiloxane and its finished fabric were measured. The results showed that: as the relative molecular weight of the polysiloxane chain segment was about 3 100,the molar ratio of polydimethylsiloxane doubleterminated with epoxy groups to diethylenetriamine was 1. 5∶ 1,the temperature of the synthesis reaction was 80 ℃,the time of the synthesis reaction was 3 h,and the amount of isopropyl alcohol as dissolvent was 30% of the total mass of reactants,the epoxy conversion rate was 93. 25%,the emulsion of synthetic products had excellent stable property and no floating oil,and the average particle size of the emulsion was 56 nm. Compared with amino silicone and block polyether modified amino silicone,the fabric finished by the modified polysiloxane had better softness and hydrophilicity and lower yellowing.