Ultraviolet-curable aqueous polyurethane dispersion and preparation method thereof
A water-based polyurethane and dispersion technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of low crosslinking density, low hardness, low double bond content, etc., and achieve excellent hardness, high crosslinking density and storage. Excellent stability
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Embodiment 1
[0035]2000Ml three-neck flask, equipped with thermometer, stirring, heating and stirring device. Add 500 g of refined castor oil into the three-necked flask, stir and heat to 120±5°C. Vacuum dehydration for 60 minutes, cool down to 70°C, add 370.6 grams of IPDI (isophorone diisocyanate), maintain 80±5°C for 3 hours, cool to 60°C, add 300g of anhydrous acetone, drop the temperature to 45±5°C and add, Add 93g of methyldiethanolamine dropwise for 30min. After the dropwise addition, add 0.5g of organic bismuth catalyst and keep warm at 50±2°C for 3 hours. Add 56 g of dehydrated hydroxyethyl methacrylate, and react at 60±2°C for 2 hours until the reaction is complete (the absorption peak of NCO functionality at 2260-2280 cm-1 detected by infrared spectroscopy disappears to zero). Cool to 30±2°C, transfer the prepolymer to a 5L emulsification tank, add a mixed solution of 46g acetic acid and 1200g deionized water under high-speed stirring to obtain a water dispersion, distill off a...
Embodiment 2
[0037] 2000Ml three-neck flask, equipped with thermometer, stirring, heating and stirring device. Add 400g of refined castor oil into the three-necked flask, stir and heat to 120±5°C, vacuum dehydrate for 60min, add 18g of dehydrated pentylene glycol, cool to 70°C, add HMDI (dicyclohexylmethane diisocyanate, purity ≥99.5% ) 324.3 g, maintained at 82±2°C for 3 hours. Cool to 60°C, add 250g of anhydrous methyl ethyl ketone, drop the temperature to 45±5°C, add 99.8g of methyldiethanolamine dropwise, add dropwise for 30 minutes, and keep warm at 50±2°C for 3 hours after the dropwise addition. Add 100 g of dehydrated hydroxypropyl acrylate, 0.5 g of organic bismuth catalyst, and react at 60±2°C for 2 hours until the reaction is complete (the absorption peak of NCO functionality at 2260-2280 cm-1 detected by infrared spectroscopy disappears to zero). Cool to 30±2°C, transfer the prepolymer to a 5L emulsification tank, add a mixed solution of 49.2g acetic acid and 1600g deionized wa...
Embodiment 3
[0040] 2000Ml three-neck flask, equipped with thermometer, stirring, heating and stirring device. Add 600g of refined castor oil into the three-necked flask, stir and heat to 120±5°C, vacuum dehydrate for 60min, cool down to 70°C, add 20g of dehydrated 1,4-butanediol, add IPDI (isophorone diisocyanate) 419.3 grams, maintained at 82±2°C for 3 hours. Cool to 60°C, add 250g of anhydrous acetone, drop the temperature to 45±5°C, add 99.8g of methyldiethanolamine dropwise, add dropwise for 30 minutes, and keep warm at 50±2°C for 3 hours after the dropwise addition. Add 100 g of dehydrated hydroxypropyl acrylate, 0.5 g of organic bismuth catalyst, and react at 60±2°C for 2 hours until the reaction is complete (the absorption peak of NCO functionality at 2260-2280 cm-1 detected by infrared spectroscopy disappears to zero). Cool to 30±2°C, transfer the prepolymer to a 5L emulsification tank, add a mixed solution of 49.2g acetic acid and 1600g deionized water under high-speed stirring ...
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