Method for preparing organic silicon graft modified polyurethane resin for synthetic leather
A polyurethane resin, graft modification technology, applied in textiles, papermaking, fiber processing, etc., can solve the problems of difficulty in synthesizing grafted silicone-modified polyurethanes and cannot be grafted side chains, and achieve smooth and durable hand feel. The effect of maintaining the property and improving the water contact angle
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[0028] With 140 parts of polyester diol, its molecular weight is 2000, heat up to 110°C, vacuum dehydrate for 1 hour, cool down to 50°C, add 400 parts of dimethylformamide to the reaction kettle, 30 parts of one end contains two hydroxyl groups , the other end does not contain active hydrogen groups to make high-purity silicone, its molecular weight is 50000, 8 parts of 1,4-butanediol, 10 parts of ethylene glycol and stir well; add 25 parts of TDI, 35 parts of MDI, 0.5 parts of organic bismuth Catalyst, stir and heat up to 75°C, react for 3.5 hours, add 250 parts of toluene, keep the temperature at 75°C, use 8.8 parts of MDI to increase viscosity, feed once every 45 minutes, 0.5 to 3 parts each time, after the viscosity reaches the predetermined value Cool down to 60°C, add 100 parts of methyl ethyl ketone and stir evenly, cool to 30°C and discharge to obtain a solid content of 25% silicone graft-modified polyurethane resin.
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