Polyurethane resin, method for preparing same and application of polyurethane resin
A technology of polyurethane resin and polyether, which is applied in the direction of textiles and papermaking, etc., can solve the problems of poor hydrolysis resistance, difficult production, low strength, etc., and achieve the effects of improving heat and humidity resistance, reducing surface tension, and prolonging service life
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[0050] The present invention provides a method for preparing polyurethane resin, including the following steps:
[0051] The present invention provides a method for preparing a water-resistant water-resistant polyurethane resin for water-based synthetic leather. The amount of each raw material component is calculated as a percentage of the total mass of all raw materials, and includes the following steps:
[0052] (1) Prepolymer preparation: Put 0-20% castor oil modified polyol and 0-20% polyether / polyester diol into the reactor, stir and heat to 100-110°C, at -0.1Mpa( Under the condition of the first degree of vacuum), vacuum dehydration until the water content in the mixed solution in the reaction kettle is below 0.03%, cool to 40°C, put in 3 to 7% diisocyanate, stir and warm to 80 to 90°C, keep warm for reaction 2~3 hours, cool to 50℃, put in 0.5~1.5% hydrophilic chain extender, 0~1% glycerol monooleate, 0~1.2% small molecule chain extender (first chain extender) And 3~5% aceto...
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