High-functionality hydroxyl-terminated polyurethane aqueous dispersion as well as preparation method and application thereof
A technology of hydroxyl-terminated polyurethane with high functionality, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of inability to guarantee the hydroxyl functionality of OH-PUD, unfavorable improvement of crosslinking degree of two-component coatings, OH-PUD Solve problems such as low solid content, achieve the effect of increasing the average hydroxyl functionality, high average hydroxyl functionality, and excellent yellowing resistance
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Embodiment 1
[0041] (1) Preparation of hydroxyl-terminated polyurethane aqueous dispersion
[0042] The type and mass percentage of each component raw material:
[0043]
[0044] Preparation process: polycaprolactone diol (molecular weight 2000), isophorone diisocyanate (IPDI), sulfonic acid polyester diol, dimethylol propionic acid, silver catalyst and acetone (accounting for acetone in the formula The mass percentage of 20%) was added to the reactor, and the temperature was raised to 75°C for 3.5 hours under nitrogen protection. When the NCO% of the system reached the theoretical value, the temperature was lowered to 65°C, and 1,4-butanediol and The solution of trimethylolpropane in acetone (accounting for 30% of the mass percentage of acetone in the formula) was reacted at 70°C for 1.5h. ), cooling to 40°C, adding triethylamine to neutralize, adding water to disperse under high-speed shearing (accounting for the consumption of 90% water in the mass percentage of water in the formula...
Embodiment 2
[0054] (1) Preparation of hydroxyl-terminated polyurethane aqueous dispersion
[0055] The type and mass percentage of each component raw material:
[0056]
[0057] Preparation process: polytetrahydrofuran ether diol (molecular weight 2000), hexamethylene diisocyanate (HDI), sulfonic acid polyester diol, dimethylol butyric acid, silver catalyst and acetone (accounting for 20% by mass of acetone in the formula) %) into the reactor, under the protection of nitrogen, the temperature was raised to 80°C for 3 hours, and when the NCO% of the system reached the theoretical value, the temperature was lowered to 65°C, and 1,4-butanediol and trimethylolpropane were added dropwise within 40 minutes A solution of acetone (accounting for 30% of the mass percent of acetone in the formula) was reacted at 75°C for 1.5h. When the NCO% of the system reached the theoretical value, an appropriate amount of acetone was added for dilution (accounting for 50% of the mass percent of acetone in th...
Embodiment 3
[0065] (1) Preparation of hydroxyl-terminated polyurethane aqueous dispersion
[0066] The type and mass percentage of each component raw material:
[0067]
[0068] Preparation process: polycaprolactone diol (molecular weight 2000, molecular weight 1000), dicyclohexylmethane diisocyanate (HMDI), sulfonic acid type polyester diol, silver catalyst and a small amount of acetone (accounting for the mass percentage of acetone in the formula 20%) into the reaction kettle, under the protection of nitrogen, the temperature was raised to 80°C for 4 hours, and when the NCO% of the system reached the theoretical value, the temperature was lowered to 70°C, and 1,4-butanediol and trimethylol were added dropwise within 25 minutes Propane in acetone (accounting for 30% of the mass percent of acetone in the formula) solution, reacted at 75°C for 1.0h, and when the NCO% of the system reached the theoretical value, add an appropriate amount of acetone for dilution (accounting for 50% of the...
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