Preparation method of waterborne polyurethane resin
A water-based polyurethane and resin technology, which is applied in the field of water-based polyurethane resin preparation, can solve the problems of difficulty in meeting actual needs, unsatisfactory bonding strength, gloss, heat resistance, yellowing resistance and water resistance, and improves the film-forming effect. , Excellent bond strength, low toxicity
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Embodiment 1
[0021] S1. Add 50 g of polyester polyol with a molecular weight of 500 to 10,000 g / mol into the reactor, vacuum dehydrate at 95° C. for 1 hour, and cool down to 50° C. to obtain material A;
[0022] S2. Add 15 g of isophorone isophorone isocyanate to material A, keep the temperature at 60° C. for 2 hours, and cool down to 75° C. to obtain material B;
[0023] S3. Add 1g of dimethylolpropionic acid to material B, then dropwise add 1g of 1,4-butanediol and 2g of triethylamine solution dissolved in acetone solution into the reaction kettle, keep the reaction at 45°C for 1 hour, add Bismuth catalyst 0.02g, light stabilizer 0.2g, heat preservation reaction at 45°C for 1 hour to obtain material C;
[0024] S4, after material C cools down to room temperature, add 18.5g of triethylamine for neutralization, add 1.2g of ethylenediamine, stir and react at a speed of 800r / min for 1 hour, add 24g of deionized water for emulsification and dispersion, wherein, the emulsification speed The e...
Embodiment 2
[0026] S1. Add 75 g of polyether polyol with a molecular weight of 500 to 10,000 g / mol into the reactor, vacuum dehydrate at 95° C. for 2 hours, and cool down to 50° C. to obtain material A;
[0027] S2. Add 37g of isophorone isophorone isocyanate to the material A, keep the temperature at 80°C for 4 hours, cool down to 75°C, and obtain the material B;
[0028] S3. Add 9g of dimethylolpropionic acid to material B, then add 5g of 1,4-butanediol and 12g of triethylamine solution dissolved in acetone solution dropwise into the reaction kettle, keep the reaction at 55°C for 3 hours, add Organic bismuth catalyst 0.5g, light stabilizer 2g, heat preservation reaction at 55°C for 3 hours to obtain material C;
[0029] S4, after material C cools down to room temperature, add 26g of triethylamine for neutralization, add 5.3g of triethylenediamine, stir and react for 3 hours, add 45g of deionized water for emulsification and dispersion, wherein, the emulsification speed is 1200r / min, and...
Embodiment 3
[0031] S1. Add 60 g of polyether polyol with a molecular weight of 500 to 10,000 g / mol into the reactor, vacuum dehydrate at 100° C. for 1.5 hours, and cool down to 50° C. to obtain material A;
[0032] S2. Add 25g of isophorone isophorone isocyanate to the material A, keep the temperature at 100°C for 3 hours, cool down to 79°C, and obtain the material B;
[0033] S3. Add 6g of dimethylolpropionic acid to material B, then add 3g of 1,4-butanediol and 8g of triethylamine solution dissolved in acetone solution dropwise into the reaction kettle, keep the temperature at 50°C for 1 hour, add 0.3 g of organic bismuth catalyst, 1 g of light stabilizer, and heat preservation reaction at 50 ° C for 1 hour to obtain material C;
[0034] S4, after material C cools down to room temperature, add 21g of triethylamine for neutralization, add 3.1g of tetraethylenepentamine, stir and react for 2 hours, add 32g of deionized water for emulsification and dispersion, wherein, the emulsification s...
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