Cold-resistant hydrolysis-resistant instep leather polyurethane slurry and preparation method thereof
A polyurethane slurry and hydrolysis-resistant technology, which is applied in textiles and papermaking, etc., can solve the problems of inapplicability to alpine regions, low improvement of hydrolysis resistance, and poor hydrolysis resistance of ester bonds.
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Embodiment 1
[0032]
[0033] Step 1: Add 1100kg polyester diol, 50kg polytetrahydrofuran ether, 50kg 1.4-butanediol, 1kg Sminox5313 antioxidant and 3320kg dimethylformamide into the reaction kettle, raise the temperature to 55°C, and stir 450kg of diphenylmethane diisocyanate was put in, reacted at a reaction temperature of 82°C for 2.5 hours, added 415kg of dimethylformamide, stirred and reacted for 0.8 hours, and prepolymer A was obtained;
[0034] The second step: maintain the temperature at 72°C, add the remaining diphenylmethane diisocyanate to the prepolymer A to increase the viscosity, add 1917.3kg of dimethylformamide and 2647.7kg of ethyl acetate according to the viscosity increase, and take samples to test When the viscosity is 100-100 Pa·s / 25°C and the isocyanate (NCO) content is 0.0001 mmol / g, it is stirred for 0.7 hours and then filtered and packaged.
Embodiment 2
[0036]
[0037] Step 1: Add 11300kg polyester diol, 300kg polytetrahydrofuran ether, 100kg 1.4-butanediol and 3100kg dimethylformamide into the reactor, raise the temperature to 55°C, and put 495kg diphenylmethane di Isocyanate, reacted at a reaction temperature of 82°C for 2.5 hours, added 387.5kg of dimethylformamide, stirred and reacted for 0.8 hours, and obtained prepolymer A;
[0038] The second step: maintain the temperature at 72°C, add the remaining diphenylmethane diisocyanate to the prepolymer A to increase the viscosity, add 1790.25kg of dimethylformamide and 2472.25kg of toluene according to the viscosity increase, and take a sample to measure the viscosity. 100100Pa·s / 25℃ and the content of isocyanate (NCO) is 0.0001mmol / g, after stirring for 0.7 hours, filter and pack.
Embodiment 3
[0040]
[0041] The first step: Add 1600kg polyester diol, 500kg polytetrahydrofuran ether, 400kg 1.4-butanediol and 2760kg dimethylformamide into the reaction kettle, raise the temperature to 55°C, and put 540kg diphenylmethane di Isocyanate, reacted at a reaction temperature of 82°C for 2.5 hours, added 345kg of dimethylformamide, stirred and reacted for 0.8 hours, and obtained prepolymer A;
[0042] Step 2: Maintain the temperature at 72°C, add the remaining diphenylmethane diisocyanate to the prepolymer A to increase the viscosity, add 1594kg of dimethylformamide and 2201kg of methyl ethyl ketone according to the viscosity increase, and take a sample to measure the viscosity to 100100Pa When s / 25°C and the isocyanate (NCO) content is 0.0001mmol / g, add methanol, stir for 0.7 hours, filter and pack.
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