Environment-friendly low-temperature wet stamping-discoloring polyurethane resin and preparation method for same
A polyurethane resin, an environmentally friendly technology, applied in the field of low-temperature wet pressure-change polyurethane resin for environmental-friendly leather and its preparation, can solve the problems of polyurethane resin physical property changes, high pressure change temperature, uneven color, etc. Low, stable discoloration, uniform color effect
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Embodiment 1
[0026] The invention provides an environment-friendly low-temperature wet pressure change polyurethane resin for leather and a preparation method thereof, comprising the following steps:
[0027] 1) Put 0.48 kg of polybutylene adipate polyol, 0.1 kg of polycaprolactone polyol and 0.6 kg of dimethylformamide into a glass reactor, raise the temperature to 60°C, and stir for 30 minutes;
[0028] 2) Put 0.05 kg of diphenylmethane diisocyanate into the reactor, raise the temperature to 80°C and react for 2.5 hours to make a prepolymer;
[0029] 3) Put 0.86 kg of dimethylformamide, 0.03 kg of ethylene glycol, and 0.053 kg of 1.4-butanediol into the reactor, keep the temperature at 80°C, and stir for 20 minutes;
[0030] 4) Put 0.27 kg of diphenylmethane diisocyanate into the reactor three times for viscosity-increasing reaction, check the viscosity, and if the viscosity is unqualified, continue to add a small amount of diphenylmethane diisocyanate for viscosity-increasing reaction u...
Embodiment 2
[0034] The invention provides an environment-friendly low-temperature wet pressure change polyurethane resin for leather and a preparation method thereof, comprising the following steps:
[0035] 1) Put 0.6 kg of polybutylene adipate polyol, 0.25 kg of polycaprolactone polyol and 1.05 kg of dimethylformamide into a glass reactor, raise the temperature to 60°C, and stir for 30 minutes;
[0036] 2) Put 0.05 kg of diphenylmethane diisocyanate into the reactor, raise the temperature to 80°C and react for 2.5 hours to make a prepolymer;
[0037] 3) Put 1.4 kg of dimethylformamide, 0.04 kg of ethylene glycol, and 0.15 kg of 1.4-butanediol into the reactor, keep the temperature at 80°C, and stir for 20 minutes;
[0038] 4) Put 0.336 kg of diphenylmethane diisocyanate into the reactor three times for viscosification reaction, check the viscosity, if the viscosity is unqualified, continue to add a small amount of diphenylmethane diisocyanate for viscosification reaction until the visco...
Embodiment 3
[0042] The invention provides an environment-friendly low-temperature wet pressure change polyurethane resin for leather and a preparation method thereof, comprising the following steps:
[0043] 1) Put 0.64 kg of polybutylene adipate polyol, 0.12 kg of polycaprolactone polyol and 0.84 kg of dimethylformamide into a glass reactor, raise the temperature to 60°C, and stir for 30 minutes;
[0044] 2) Put 0.06 kg of diphenylmethane diisocyanate into the reactor, raise the temperature to 80°C and react for 2.5 hours to make a prepolymer;
[0045] 3) Put 1.12 kg of dimethylformamide, 0.04 kg of ethylene glycol, and 0.12 kg of 1.4-butanediol into the reactor, keep the temperature at 80°C, and stir for 20 minutes;
[0046] 4) Put 0.3 kg of diphenylmethane diisocyanate into the reaction kettle for viscosity increasing reaction three times, check the viscosity, if the viscosity is unqualified, continue to add a small amount of diphenylmethane diisocyanate for viscosity increasing reacti...
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