Synthesis method of waterborne polyurethane primer
A technology of water-based polyurethane and synthesis method, used in polyurea/polyurethane coatings, coatings, primers, etc., can solve the problems of low bonding strength and poor stability, and achieve high solid content, good stability, and improved water resistance. Effect
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Embodiment 1
[0052] 1) 50g of dehydrated polycarbonate diol (molecular weight: 2000), 2.24g of dimethylolpropionic acid containing carboxylic acid groups, 22.64g of isophorone diisocyanate (IPDI) and 2.67g of 1,6-hexyl Add diisocyanate into the reactor, heat to 85°C during the stirring process and keep it warm for 1 hour, add 20g of acetone and 0.03g of catalyst dibutyltin dilaurate (T-12) and continue the reaction for 1h, then add 2.0g of 1,4 -Butanediol (BDO) and 20g of acetone, then react at 60°C for 2 hours, use di-n-butylamine back titration to analyze the NCO% content reaches the theoretical value, then cool down to 50°C, add 1.69g of triethylamine to neutralize For 20 minutes, the temperature was lowered to 40°C at the same time to obtain the intermediate;
[0053] 2) Add 9.8g of 50wt% sodium ethylenediamine sulfonate aqueous solution to the above-mentioned intermediate and stir rapidly for 10 minutes, then add deionized water and 5.4g of 3-ammonia Propyltriethoxysilane (KH550) and...
Embodiment 2
[0056] 1) 50g of dehydrated polycarbonate diol (molecular weight: 2000), 2.24g of dimethylolpropionic acid containing carboxylic acid groups, 22.64g of isophorone diisocyanate (IPDI) and 2.67g of 1,6-hexyl Add diisocyanate into the reactor, heat to 85°C during the stirring process and keep it warm for 1 hour, add 20g of acetone and 0.03g of catalyst dibutyltin dilaurate (T-12) and continue the reaction for 1h, then add 2.36g of diethylene glycol Alcohol (DEG) and 20g of acetone were reacted at 60°C for 2 hours, and the NCO% content was analyzed by di-n-butylamine back titration method to reach the theoretical value. After that, the temperature was lowered to 50°C, and 1.69g of triethylamine was added for neutralization for 20 minutes. At the same time, the temperature was lowered to 40° C. to obtain the intermediate;
[0057] 2) Add 9.8g of 50wt% sodium ethylenediamine sulfonate aqueous solution to the above-mentioned intermediate and stir rapidly for 10 minutes, then add deio...
Embodiment 3
[0060] 1) 50g of dehydrated polycarbonate diol (molecular weight is 2000), 2.24g of dimethylol propionic acid containing carboxylic acid groups, 26.7g of 4,4'-dicyclohexylmethane diisocyanate (H 12 MDI) and 2.67g of 1,6-hexamethylene diisocyanate were added to the reactor, heated to 85°C during the stirring process and kept for 1 hour of reaction, adding 20g of acetone and 0.03g of catalyst dibutyltin dilaurate (T-12) and continuing React for 1 hour, then add 2.63g of 1,6-hexanediol (HDO) and 20g of acetone, then react at 60°C for 2 hours, use di-n-butylamine back titration to analyze the NCO% content and reach the theoretical value, then cool down to 50°C , add 1.69g triethylamine to neutralize for 20 minutes, while cooling down to 40°C to obtain the intermediate;
[0061] 2) Add 9.8g of 50wt% sodium ethylenediamine sulfonate aqueous solution to the above-mentioned intermediate and stir rapidly for 10 minutes, then add deionized water and 3.54g of 3-ammonia Propyltriethoxysi...
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