The Research Of Application And Synthesis Of Polyurethane-organic Silicon Copolymer

At present, in the market the best silicone softener is amino silicone, however amino silicone oil have many shortcomings such as poor water soluble and easy yellowing,it needs to be further modified, this article through the synthesis of modified silane hydroxy end capping agent first, then with telomeric D4, get alkane hydroxyl end dimethyl siloxane, copolymerization reaction with polyurethane prepolymers, then can get the emulsion of polyurethane modified silicone softener, the best synthesis process is that silane hydroxy end capping agent modified raw material for the two n-butyl amine,modification temperature 85 ℃, modified time is 4 hours, alkane hydroxyl sealing side dimethyl siloxane polymerization temperature is 120 ℃, polymerization time is 2 hours,siloxane best molecular weight is 8000g/mol, Polyurethane pre temperature 70 ℃, the performed time is 2 hours, R value is 1.8, copolymerization time of polyurethane silicone copolymer is 4 hours, copolymerization temperature is 65 ℃. the best finishing process is:the finishing agent(solid content 30%) usage: 100 g/L, rolling rate 85%, curing temperature:120 ℃, the curing time :2min. Homemade softener and commercially available organic silicon softener effect comparison, get the conclusion: homemade softener compared with commercially available softener, feel is better than that of commercially available softener half magnitude, whiteness, strength is superior to commercial softening agent, fabric softness was lower than those of commercially available softener, shows good softness. Crease recovery Angle were similar, resilience.And the wetting time is commercially available softener much shorter, explain the wet ability is relatively good. At the same time, commercial softener used solvent soluble polymer, while homemade softener saves the cost of the solvent, comprehensive consideration of various indicators, homemade softener has obvious advantages.