Mixed solvent-free silicon-containing waterborne polyurethane coating and preparation method thereof
A polyurethane coating, solvent-free technology, applied in the direction of polyurea/polyurethane coating, coating, etc., to achieve the effect of broadening the application range
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Embodiment 1
[0036] Mix hydroxyalkyl silicone oil and polytetrahydrofuran PTMG4000 in a four-neck flask at a mass ratio of 1:9, heat the oil bath to 100°C under mechanical stirring at 200r / min, and vacuumize for 1h to dehydrate. After vacuuming, protect with nitrogen, and lower the temperature to 40°C, add isophorone diisocyanate according to 2.5 times the total molar weight of hydroxyalkyl silicone oil and polyether diol, and add 0.3% of the sum of the two mass The catalyst is stannous octoate, the temperature of the oil bath is raised to 80°C, and the reaction is carried out for 4 hours. Cool down to 30°C, take sodium diaminobenzenesulfonate 1.3 times the total molar weight of hydroxyalkyl silicone oil and polyether diol, dissolve in hydroxyalkyl silicone oil, polyether glycol, diisocyanate and sodium diaminobenzenesulfonate Deionized water with a total mass of 70% was quickly added to the reaction vessel, and the mechanical stirring speed was adjusted to 400r / min, and the reaction was c...
Embodiment 2
[0038]Mix hydroxyalkyl silicone oil and polytetrahydrofuran PTMG4000 in a four-necked flask at a mass ratio of 1:4, heat the oil bath to 100°C under mechanical stirring at 220 r / min, and vacuumize for 1 hour to dehydrate. After vacuuming, protect with nitrogen, and lower the temperature to 40°C, add isophorone diisocyanate according to twice the total molar weight of hydroxyalkyl silicone oil and polyether diol, and add 0.1% of the sum of the two mass The catalyst is stannous octoate, the temperature of the oil bath is raised to 70°C, and the reaction is carried out for 3 hours. Cool down to 30°C, take sodium diaminobenzenesulfonate that is 1 times the total molar weight of hydroxyhydrocarbyl silicone oil and polyether diol, dissolve in hydroxyhydrocarbyl silicone oil, polyether diol, diisocyanate and sodium diaminobenzenesulfonate Deionized water with a total mass of 50% was quickly added to the reaction vessel, and the mechanical stirring speed was adjusted to 500r / min. Rea...
Embodiment 3
[0040] Mix hydroxyalkyl silicone oil and polyether glycol N220 in a four-necked flask at a mass ratio of 1:6, heat the oil bath to 100°C under mechanical stirring at 180 r / min, and vacuumize for 1 hour to dehydrate. After vacuuming, protect with nitrogen, and lower the temperature to 40°C, add isophorone diisocyanate according to 1.5 times the total molar weight of hydroxyalkyl silicone oil and polyether diol, and add 0.2% of the sum of the two mass The catalyst is stannous octoate, the temperature of the oil bath is raised to 60°C, and the reaction is carried out for 3 hours. Cool down to 20°C, take sodium diaminobenzenesulfonate that is 1.3 times the total molar weight of hydroxyalkyl silicone oil and polyether diol, dissolve in the total amount of hydroxyalkyl silicone oil, polyether diol, diisocyanate and sodium diaminobenzenesulfonate Deionized water with a mass of 30% was quickly added to the reaction vessel, and the mechanical stirring speed was adjusted to 400r / min, an...
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