Adiation-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 inlet tube, add toluene diisocyanate and a polylactic acid derivative (number average molecular weight of 2000) with the aforementioned structure I, toluene diisocyanate: having the aforementioned The molar ratio of the polylactic acid derivative of structure I is 2: 1, and the catalyst dibutyltin dilaurate is added, and the quality of the catalyst is 0.03% of the total mass of toluene diisocyanate and the polylactic acid derivative with the aforementioned structure I; the temperature is raised to 80°C Stir and react for 1 hour; then lower the temperature to 45°C, add hydroxyethyl acrylate and toluene diisocyanate equimolar, stir and react at constant temperature for 3 hours; finally raise the temperature to 95°C and stir for 0.5 hour, cool down to room temperature, and discharge. Measure the viscosity of gained resin and be 15000mPa s (60 ℃, the Brookfield rotational vis...
Embodiment 2
[0026] In a dry four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen inlet tube, add hexamethylene diisocyanate and polylactic acid derivatives (number average molecular weight is 400) with the aforementioned structure II, hexamethylene Hexamethylene diisocyanate: the molar ratio of the polylactic acid derivative with the aforementioned structure II is 2:1, and the catalyst dibutyltin dilaurate is added, and the quality of the catalyst is the total amount of hexamethylene diisocyanate and the polylactic acid derivative with the aforementioned structure II 0.03% of the mass; heat up to 85°C and stir for 1.5 hours; then cool down to 50°C, add hydroxypropyl acrylate which is equimolar to hexamethylene diisocyanate, and stir for 2 hours at a constant temperature; finally raise the temperature to 90°C and stir for 0.5 Hours, down to room temperature, discharge. Measure the viscosity of gained resin to be 8600mPa s (60 ℃, the Brookfield rotatio...
Embodiment 3
[0028] In a dry four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen inlet tube, add isophorone diisocyanate and polylactic acid derivatives (number average molecular weight is 1000) with the aforementioned structure III, and the isophorone Ketone diisocyanate: the molar ratio of the polylactic acid derivative with the aforementioned structure III is 2:1, and the catalyst dibutyltin dilaurate is added, 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 and stir for 1 hour; then cool down to 45°C, add hydroxybutyl acrylate equivalent to isophorone diisocyanate, and stir for 3 hours at a constant temperature; finally raise the temperature to 95°C and stir for 1 Hours, down to room temperature, discharge. Measure the viscosity of gained resin to be 10800mPa s (60 ℃, the Brookfield rotational viscometer that ...
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