Aqueous polyurethane coating and preparation method thereof
A water-based polyurethane and coating technology, applied in antifouling/underwater coatings, coatings, and biocide-containing paints, etc., can solve the problems of poor hardness, insufficient cross-linking degree, and poor adhesion of water-based polyurethane coatings. Achieve improved adhesion, improved strength and surface finish, and extended life
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Embodiment 1
[0022] A water-based polyurethane coating, its composition by weight: 9.2 parts of hexamethylene diisocyanate trimer, 4.6 parts of dimethylol propionic acid, 17.1 parts of polyethylene glycol 1000, 6.8 parts of dimethylformamide, 3.4 parts of isophorone diisocyanate, 3.5 parts of triethylamine, 0.9 part of trimethylolpropane, 52.4 parts of water, 0.3 part of dibutyltin dilaurate and 36.2 parts of isocyanate curing agent; its preparation method comprises the following steps:
[0023] a. Add polyethylene glycol 1000, dimethylolpropionic acid, 0.2 parts of dibutyltin dilaurate and solvent dimethylol to a four-neck flask equipped with a stirrer, thermometer, condenser tube and constant pressure dropping funnel Add the weighed hexamethylene diisocyanate trimer to the above mixture dropwise within 30 min, and react at 50°C for 2 h, then raise the temperature to 60°C, and continue the reaction for 1 h, every The mass percentage of -NCO group of 0.5 h sampling measurement system, unti...
Embodiment 2
[0035] A water-based polyurethane coating, its composition by weight: 9.3 parts of hexamethylene diisocyanate trimer, 4.5 parts of dimethylol propionic acid, 17.4 parts of polyethylene glycol 1000, 6.7 parts of dimethylformamide, 3.6 parts of isophorone diisocyanate, 3.4 parts of triethylamine, 1.5 parts of trimethylolpropane, 52.8 parts of water, 0.3 part of dibutyltin dilaurate and 38.2 parts of isocyanate curing agent; its preparation method comprises the following steps:
[0036] a. Add polyethylene glycol 1000, dimethylolpropionic acid, 0.2 parts of dibutyltin dilaurate and solvent dimethylol to a four-neck flask equipped with a stirrer, thermometer, condenser tube and constant pressure dropping funnel Add the weighed hexamethylene diisocyanate trimer to the above mixture dropwise within 30 min, and react at 50 °C for 2 h, then raise the temperature to 60 °C, and continue the reaction for 1 h, every The mass percentage of -NCO group of 0.5 h sampling measurement system, u...
Embodiment 3
[0048] A water-based polyurethane coating, its composition by weight: 9.4 parts of hexamethylene diisocyanate trimer, 4.8 parts of dimethylol propionic acid, 18.0 parts of polyethylene glycol 1000, 7.0 parts of dimethylformamide, 3.8 parts of isophorone diisocyanate, 3.6 parts of triethylamine, 2.1 parts of trimethylolpropane, 53.0 parts of water, 0.5 part of dibutyltin dilaurate and 40.2 parts of isocyanate curing agent; its preparation method comprises the following steps:
[0049] a. Add polyethylene glycol 1000, dimethylolpropionic acid, 0.3 parts of dibutyltin dilaurate and solvent dimethylol to a four-necked flask equipped with a stirrer, thermometer, condenser tube and constant pressure dropping funnel Add the weighed hexamethylene diisocyanate trimer to the above mixture dropwise within 30 min, and react at 55 °C for 2 h, then raise the temperature to 65 °C, and continue the reaction for 1 h, every The mass percentage of -NCO group of 0.5 h sampling measurement system,...
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