Preparation method of environment-friendly aqueous polyurethane coating of polypropylene carbonate type
A polypropylene carbonate and water-based polyurethane technology is applied in the field of preparation of environment-friendly polypropylene carbonate-based water-based polyurethane coatings to achieve the effects of high storage stability, strong adhesion and uniform distribution.
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Embodiment 1
[0021] In parts by weight, after dehydrating 100 parts of polypropylene carbonate polyol with a molecular weight of 1000, add 60 parts of hexamethylene diisocyanate and 0.05 parts of bismuth isooctanoate, heat up to 50°C, react for 5 hours, and cool down to 40°C , add 6 parts of dimethylolpropionic acid, heat up to 50°C, react for 5 hours, cool down to 0°C, add 0.5 parts of triethylamine, add 0.5 parts of acetone, stir well, add 1 part of 1,4-butanediol , and then add 210 parts of deionized water, emulsify at 0°C for 0.1h, remove acetone under reduced pressure, and obtain an environment-friendly polypropylene carbonate-based waterborne polyurethane coating.
Embodiment 2
[0023] In parts by weight, after dehydrating 100 parts of polypropylene carbonate polyol with a molecular weight of 2000, add 40 parts of toluene diisocyanate, 0.1 part of bismuth neodecanoate, heat up to 85°C, react for 1 hour, cool down to 40°C, add 12 parts of dimethylol butyrate half ester, heat up to 70°C, react for 1 hour, cool down to 0°C, add 8 parts of dimethylcyclohexylamine, add 20 parts of acetone, stir well, add 3 parts of ethylene glycol, Then add 350 parts of deionized water, emulsify at 0°C for 2 hours, and remove acetone under reduced pressure to obtain an environment-friendly polypropylene carbonate-based waterborne polyurethane coating.
Embodiment 3
[0025] In parts by weight, after dehydrating 100 parts of polypropylene carbonate polyol with a molecular weight of 1500, add 50 parts of 4,4'-diphenylmethane diisocyanate and 1 part of bismuth isooctanoate, heat up to 85°C, and react for 1 hour , lower the temperature to 50°C, add 16 parts of dimethylol propionic acid, raise the temperature to 80°C, react for 1 hour, cool down to 0°C, add 18 parts of tripropylamine, add 40 parts of acetone, stir well, then add diethylene diethylene glycol Add 4 parts of alcohol, then add 300 parts of deionized water, emulsify at 5°C for 0.5 h, remove acetone under reduced pressure, and obtain an environmentally friendly polypropylene carbonate-based waterborne polyurethane coating.
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