Method for preparing waterborne polyurethane fluorocarbon paint
A technology of water-based polyurethane and fluorocarbon coatings, applied in the field of coatings, can solve the problems of poor anti-ultraviolet effect, poor leveling effect and adhesion of water-based coatings, and achieve no harm to human health, superior protection performance, and good impermeability Effect
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example 1
[0018] Weigh 1.5g of trimethylolpropane and 18mL of N-methyldiethanolamine into a reaction vessel, heat to 100°C, and keep the temperature for 1h, then cool down to 40°C, then add 18mL of isocyanate dropwise at 1mL / min Phorone diisocyanate, after the dropwise addition, add 0.1mL dibutyltin dilaurate, and stir at 300r / min for 1h to obtain a reaction solution. Add glacial acetic acid to the above reaction solution until the pH of the reaction solution is neutral. Set aside for 30 minutes to obtain a water-based hydroxyl-terminated cationic polyurethane, then transfer the water-based hydroxyl-terminated cationic polyurethane to 120 mL of deionized water, and stir at 500 r / min for 20 minutes to obtain a water-based hydroxyl-terminated cationic polyurethane emulsion. Add silicon oxide into 11mL styrene, stir at 300r / min for 10min, then add 0.75g silane coupling agent KH-570, and disperse with 200W ultrasonic wave for 10min, then add 0.5g sodium dodecylsulfonate, 0.5g Alkylphenol po...
example 2
[0021] Weigh 1.65g of trimethylolpropane and 19mL of N-methyldiethanolamine into a reaction kettle, heat to 102.5°C, and keep the temperature for 1.5h, then cool down to 45°C, then add 19mL dropwise at 1mL / min After the addition of isophorone diisocyanate, add 0.15mL of dibutyltin dilaurate and stir at 350r / min for 1.5h to obtain a reaction solution. Add glacial acetic acid to the above reaction solution until the pH of the reaction solution is neutral. , stand still for 35min to obtain the water-based hydroxyl-terminated cationic polyurethane, then transfer the water-based hydroxyl-terminated cationic polyurethane into 135mL deionized water, and stir at 550r / min for 25min to obtain the water-based hydroxyl-terminated cationic polyurethane emulsion, set aside, weigh 4.5 g nano-silica, add 16.5mL styrene, stir at 350r / min for 12.5min, then add 1.125g silane coupling agent KH-570, and disperse with 200W ultrasonic wave for 12.5min, then add 0.75g dodecyl Sodium sulfonate, 0.75g al...
example 3
[0024] Weigh 1.8g of trimethylolpropane and 20mL of N-methyldiethanolamine into a reaction kettle, heat to 105°C, and keep the temperature for 2h, then cool down to 50°C, then add 20mL of isocyanate dropwise at 1mL / min Phorne diisocyanate, after the dropwise addition, add 0.2mL dibutyltin dilaurate and stir at 400r / min for 2h to obtain a reaction solution. Add glacial acetic acid to the above reaction solution until the pH of the reaction solution is neutral. Set aside for 40 minutes to obtain a water-based hydroxyl-terminated cationic polyurethane, then transfer the water-based hydroxyl-terminated cationic polyurethane to 150 mL of deionized water, and stir at 600 r / min for 30 minutes to obtain a water-based hydroxyl-terminated cationic polyurethane emulsion. Add silicon oxide to 22mL styrene, stir at 400r / min for 15min, add 1.50g silane coupling agent KH-570, and disperse with 200W ultrasonic wave for 15min, then add 1.0g sodium dodecylsulfonate, 1.0g Alkylphenol polyoxyethy...
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