A water-resistant and peelable silicon-modified waterborne polyurethane microcapsule coating and its preparation method
A technology of polyurethane microcapsules and silicon modification, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of polluting the environment, endangering the health of construction workers, and inability to take into account water resistance, and achieves a simple preparation process. The effect of foaming ability and avoiding cost increase
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Embodiment 1
[0026] Step 1. Mix 11.6kg of hydroxyethyl acrylate and 22.14kg of 3-aminopropyltriethoxysilane evenly, and then perform Michael addition reaction at 40°C for 3 hours to obtain silicon-containing component A, which is ready for use;
[0027] Step 2. First place 35kg of polyethylene adipate diol with a number average molecular weight of 2000g / mol at 130°C and a vacuum of -0.09MPa for dehydration for 1.5h. After cooling down to 60°C, add to Add 18kg of isophorone diisocyanate and 15kg of diphenylmethane diisocyanate to the dehydrated polyethylene adipate diol, mix for 0.5h, then raise the temperature to 82°C, and continue the reaction for 2.5h to obtain the substance B;
[0028] Step 3. Add 7kg of dimethylolbutyric acid to substance B, and then react at 82°C for 2.5h to obtain substance C;
[0029] Step 4. After the temperature of substance C drops to 55°C, add 9kg of silicon-containing component A and 5kg of isopropanol to substance C, and then react at 55°C for 1.5h to obtain ...
Embodiment 2
[0034] Step 1. Mix 26.02kg of hydroxyethyl methacrylate and 22.14kg of 3-aminopropyltriethoxysilane evenly, and then carry out Michael addition reaction at 35°C for 2.5h to obtain silicon-containing component A, which is ready for use ;
[0035] Step 2. First, dehydrate 35kg of polycarbonate diol with a number average molecular weight of 1500g / mol at 120°C and a vacuum of -0.09MPa for 2 hours. After cooling down to 60°C, dehydrate the polycarbonate Add 15kg of isophorone diisocyanate and 14kg of toluene diisocyanate to the diol, mix for 0.5h, then raise the temperature to 82°C, and continue the reaction for 2.5h to obtain substance B;
[0036] Step 3. Add 5kg of dimethylolpropionic acid and 0.5kg of glycolic acid to substance B, and then react at 82°C for 2.5h to obtain substance C;
[0037] Step 4. After the temperature of substance C drops to 55°C, add 10kg of silicon-containing component A and 6kg of isopropanol to substance C, and then react at 55°C for 1.5h to obtain sub...
Embodiment 3
[0042] Step 1. Mix 11.6kg of hydroxyethyl acrylate and 20.64kg of N-aminoethyl-3-aminopropylmethyldimethoxysilane evenly, and then perform Michael addition reaction at 40°C for 3h to obtain a silicon-containing group Point A, to be used;
[0043] Step 2. First place 10kg of polycaprolactone diol with a number average molecular weight of 1000g / mol and 20kg of polyethylene adipate diol with a number average molecular weight of 2000g / mol at 130°C and a vacuum of -0.09 Under the condition of MPa, carry out dehydration for 1.5h. After cooling down to 60°C, add 12kg of 1,6-hexamethylene diisocyanate and 20kg of diphenylmethane diisocyanate to the dehydrated mixture. After mixing for 0.5h, add The temperature was raised to 82°C, and the reaction was continued for 2.5 hours to obtain substance B;
[0044] Step 3. Add 6kg of dimethylolbutyric acid and 1kg of glycolic acid to substance B, and then react at 82°C for 2.5h to obtain substance C;
[0045] Step 4. After the temperature of ...
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