Waterborne polyurethane coating and preparation method thereof
A technology of water-based polyurethane and coatings, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as research reports and industrial application examples of water-based polyurethane coatings that have not been seen, and achieve excellent hydrolysis resistance, excellent wear resistance, and strong The effect of storage stability
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Embodiment 1
[0021] 100 parts of polypropylene carbonate polyols with a hydroxyl value of 56 were dehydrated under vacuum at 80°C and 5 Pa for 2 hours, and 4 parts of 2,2-dimethylol propionic acid, 1,6-hexamethylene diisocyanate (HDI ) 26.6 parts, react at 75°C for 1 hour, heat up to 85°C for 2 hours, cool down to 70°C and add 2 parts of 1,4 butanediol to react for 0.5-2 hours, cool down to 60°C, add 100 parts of acetone, and reflux for 2 Hours, cool down to 40°C, add 4 parts of triethylamine, react for 20 minutes, add 200 parts of deionized water, heat to 50°C, emulsify for 30 minutes, remove acetone under reduced pressure, and obtain a water-based polyurethane coating. The obtained water-based polyurethane was placed in a centrifuge and settled for 20 minutes at a speed of 3000r / min, and no obvious precipitation was generated. Low-temperature stability: Freeze in a refrigerator at -25°C, thaw at room temperature, repeat 3-5 times, no demulsification occurs. After the paint film is dried...
Embodiment 2
[0023] 100 parts of polypropylene carbonate polyols with a hydroxyl value of 56 were dehydrated under vacuum at 80°C and 5 Pa for 2 hours, and 5 parts of 2,2-dimethylolpropionic acid, 1,6-hexamethylene diisocyanate (HDI ) 38 parts, react at 75°C for 1 hour, heat up to 85°C for 2 hours, cool down to 70°C, add 2 parts of trimethylolpropane to react for 0.5-2 hours, cool down to 60°C, add 100 parts of acetone, and reflux for 2 hours , lower the temperature to 40°C, add 10 parts of triethylamine, react for 40 minutes, add 150 parts of deionized water, heat to 50°C, emulsify for 30 minutes, remove acetone under reduced pressure, and obtain a water-based polyurethane coating. The obtained water-based polyurethane was placed in a centrifuge and settled for 20 minutes at a speed of 3000r / min, and no obvious precipitation was generated. Low-temperature stability: Freeze in a refrigerator at -25°C, thaw at room temperature, repeat 3-5 times, no demulsification occurs. After the paint f...
Embodiment 3
[0025] 100 parts of polypropylene carbonate polyols with a hydroxyl value of 56 were dehydrated under vacuum at 80°C and 5 Pa for 2 hours, and 8 parts of 2,2-dimethylol propionic acid, 1,6-hexamethylene diisocyanate (HDI ) 39.5 parts, react at 75°C for 2 hours, heat up to 85°C for 3 hours, cool down to 70°C and add 2 parts of 1,4 butanediol to react for 0.5-2 hours, cool down to 60°C, add 50 parts of acetone, and reflux for 2 Hours, lower the temperature to 40°C and add 6 parts of triethylamine, react for 30 minutes, add 300 parts of deionized water, heat to 50°C, emulsify for 30 minutes, remove acetone under reduced pressure, and obtain a water-based polyurethane coating. The obtained water-based polyurethane was placed in a centrifuge and settled for 20 minutes at a speed of 3000r / min, and no obvious precipitation was generated. Low-temperature stability: Freeze in a refrigerator at -25°C, thaw at room temperature, repeat 3-5 times, no demulsification occurs. After the pain...
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