Radiation-hardenable polyurethane resin and preparation method thereof
A technology of radiation curing and polyurethane acrylate, which is applied in the direction of polyurea/polyurethane coating, application, coating, etc., can solve the problems of easy to produce mold, complicated formula, time-consuming, etc., and achieve the effect of improving biodegradable environmental protection
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Embodiment 1
[0024] In a dry four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen introduction tube, add toluene diisocyanate and the polylactic acid derivative with the aforementioned structure I (number average molecular weight is 2000), toluene diisocyanate: with the aforementioned structure I The molar ratio of the polylactic acid derivative of structure I is 2:1, adding catalyst dibutyltin dilaurate, and the quality of the catalyst is 0.03% of the total mass of toluene diisocyanate and the polylactic acid derivative having the aforementioned structure I; be warming up to 80 ° C The reaction was stirred for 1 hour; then the temperature was lowered to 45° C., hydroxyethyl acrylate with an equimolar amount of toluene diisocyanate was added, and the reaction was stirred at a constant temperature for 3 hours; finally, the temperature was raised to 95° C. and the reaction was stirred for 0.5 hour, then lowered to room temperature and discharged. The vis...
Embodiment 2
[0026] In a dry four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen introduction tube, add hexamethylene diisocyanate and the polylactic acid derivative with the aforementioned structure II (number average molecular weight is 400), hexamethylene diisocyanate The molar ratio of base diisocyanate: the polylactic acid derivative with the aforementioned structure II is 2:1, and the catalyst is added with dibutyltin dilaurate, and the mass of the catalyst is the total of hexamethylene diisocyanate and the polylactic acid derivative with the aforementioned structure II. 0.03% of the mass; heat up to 85°C for stirring reaction for 1.5 hours; then cool down to 50°C, add hydroxypropyl acrylate with an equimolar amount of hexamethylene diisocyanate, and stir at constant temperature for 2 hours; finally heat up to 90°C for stirring reaction for 0.5 After 1 hour, it was lowered to room temperature, and the material was discharged. The viscosity of t...
Embodiment 3
[0028] In a dry four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen introduction tube, isophorone diisocyanate and the polylactic acid derivative (number average molecular weight of 1000) with the aforementioned structure III were added, and isophorone diisocyanate was added. Ketone diisocyanate: the molar ratio of the polylactic acid derivative with the aforementioned structure III is 2:1, and the catalyst is added with dibutyltin dilaurate, and the quality of the catalyst is the total amount of isophorone diisocyanate and the polylactic acid derivative with the aforementioned structure III. 0.03% of the mass; heat up to 80°C for stirring reaction for 1 hour; then cool down to 45°C, add hydroxybutyl acrylate with an equimolar amount of isophorone diisocyanate, and stir at constant temperature for 3 hours; finally heat up to 95°C for stirring reaction 1 After 1 hour, it was lowered to room temperature, and the material was discharged. Th...
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Abstract
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