Method for preparing water polyurethane binder for shoe
A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesive, adhesive type, adhesive, etc., can solve the problem of slow water volatilization, achieve less organic solvent consumption, and greater initial adhesion , The effect of simple process
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[0023] The preparation method of water-based polyurethane adhesive for shoes proposed by the present invention comprises the following steps:
[0024] (1) Mix the first polyol, the second polyol, the third polyol and the fourth polyol with each other, dry at 100°C-140°C under low vacuum for 1-3 hours, and lower the temperature to 70°C- At 90°C, the mixing mass ratio of the above four polyols is: first polyol: second polyol: third polyol: fourth polyol=1:0.2~2:0.01~0.2:0~ 0.05, then add isocyanate accounting for 3-20% of the above mixture by mass, acetone accounting for 20-80% of the above-mentioned mixture by mass and dibutyltin dilaurate accounting for 0.01-0.001% of the above-mentioned mixture by mass, and react for 2-5 hours. Prepare polyurethane prepolymer;
[0025] (2) neutralize the above-prepared prepolymer with triethylamine, neutralize the carboxylate or sulfonate to form a salt, the degree of neutralization is 80-120%, and obtain the neutralized polyurethane prepoly...
Embodiment 1
[0052] (1) Equipped with reflux condenser, thermometer, stirrer and N 2 Into the inlet four-neck flask, add monomer polyol ethylene glycol, hydrophilic monomer dimethyl isophthalate-5-sodium sulfonate and tetrabutyl titanate. Wherein, the molar ratio of ethylene glycol and dimethyl isophthalate-5-sodium sulfonate is: ethylene glycol: dimethyl isophthalate-5-sodium sulfonate=1:0.05. Tetrabutyl titanate accounts for 0.01% of the monomeric polyol. in N 2 Heat up and stir under the atmosphere, when the temperature reaches 210°C, reflux at a constant temperature for 30 minutes, add polybasic acid sebacic acid and heat up to 200°C, wherein the molar ratio of ethylene glycol to sebacic acid is: ethylene glycol:sebacic acid= 1:0.5. React at a constant temperature of 210°C for 3 hours, and finally dealcoholize at 210°C and a pressure of 500 Pa for 60 minutes. The resulting product had a hydroxyl number of 37.4 mg potassium hydroxide / gram and an acid number of 0.7 mg potassium hydro...
Embodiment 2
[0069] (1) Equipped with reflux condenser, thermometer, stirrer and N 2 Into the inlet four-necked flask, add the monomer polyalcohol butanediol, the hydrophilic monomer isophthalic acid-5-sodium sulfonate and tetrabutyl titanate. Wherein, the molar ratio of butanediol and dimethyl isophthalate-5-sodium sulfonate is: butanediol: dimethyl isophthalate-5-sodium sulfonate=1:0.15. Tetrabutyl titanate accounts for 0.01% of the monomeric polyol. in N 2 Heat up and stir under the atmosphere, when the temperature reaches 180°C, reflux at constant temperature for 30 minutes, add adipic acid and heat up to 200°C, wherein the molar ratio of butanediol to adipic acid is: butanediol:adipic acid=1: 0.8. React at a constant temperature of 210°C. After 98% of the theoretical amount of water has been produced, finally dehydrate at 210°C and 500Pa pressure for 60 minutes. The resulting product had a hydroxyl number of 52.1 mg mg potassium hydroxide / gram and an acid number of 0.9 mg potassiu...
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