Polyol polyurethane dispersions of two-component waterborne wood lacquer and preparation method thereof
A polyurethane polyol, water-based wood paint technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of high cost and complicated manufacturing process, achieve high chemical resistance, increase water resistance, and superior light stability sexual effect
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example example 1
[0038] In a 500ml four-necked flask equipped with a stirring device, a reflux condenser and a thermometer, add 200g of polyoxyethylene glycol with a molecular weight of 1000, add 6g of dibutyltin dilaurate dropwise, and start to add dropwise at a temperature of 65°C in an oil bath. 104.8g of dicyclohexylmethane diisocyanate, after the dropwise addition, react for one hour, then raise the temperature to 80°C, react for one hour, and then raise the temperature to 95°C for reaction. Then measure the content of the -NCO group once every half hour, when the content of the -NCO group reaches the theoretical value, the polyurethane prepolymer is obtained, and then in the polyurethane prepolymer, add the N- Methylpyrrolidone solution, 15.9g diethylene glycol and 13.4g trimethylolpropane, reacted for several hours, during which the content of the -NCO group was measured, and when the -NCO group was no longer present in the reaction, a hydroxyl-containing polyurethane was obtained The p...
Embodiment 2
[0040] Referring to formula 2 in Table 1, the polyoxypropylene diol with a molecular weight of 2000 is selected as the oligomer polyol, and the preparation method is the same as in Example 1. The properties and film-forming mechanical properties of the obtained polyurethane polyol dispersion are shown in Table 2.
Embodiment 3
[0042] Referring to formula 3 in Table 1, polyoxyethylene diol with a molecular weight of 600 is selected as the oligomer polyol, and the preparation method is the same as in Example 1. The properties and film-forming mechanical properties of the obtained polyurethane polyol dispersion are shown in Table 2.
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