UV (Ultraviolet)-cured polyurethane plant oil acid-ester pre-polymer as well as preparation method and application
A technology of vegetable oleate and vegetable oleate alcohol, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, applications, etc., can solve the problem that UV-cured polyurethane acrylate materials do not have biodegradability, etc., and achieve Excellent biodegradable performance, solve the problem of environmental pollution, and overcome the effect of oxygen inhibition problem
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Embodiment 1
[0043] (1) Synthesis and separation and purification of vegetable oleic acid ester alcohol: after heating 1mol tung oil to 60°C, add an alkaline solution of 6mol ethylene glycol, under stirring conditions, reflux for 80min, then add an appropriate amount of acid to neutralize, The reaction solution is left to stand and separated into layers, the liquid in the upper layer is washed with water, the water phase in the lower layer is removed, ethylene glycol and most of the water are removed by distillation under reduced pressure, and finally dried to obtain vegetable oleate alcohol;
[0044](2) Synthesis of PU prepolymer: add 1 mol of polyethylene glycol in sequence in the reaction kettle, stir and heat up to 120°C, dehydrate under reduced pressure for 2.5 hours, then cool down to 65°C, then add 1 mol of diisocyanate and catalyst dilauric acid For the mixture of dibutyltin, pay attention to controlling its dropping rate, it is preferable to drop it in 2.5h. After reacting for 3h, ...
Embodiment 2
[0047] (1) Synthesis and separation and purification of vegetable oleic acid ester alcohol: heat 1 mol of soybean oil to 80°C, add 9 mol of ethylene glycol alkaline solution, reflux reaction for 50 minutes under stirring conditions, and then add an appropriate amount of acid to neutralize , the reaction solution is left to stand, layered, and the lower glycerin layer is separated; then the upper liquid is washed with water, the lower water phase is removed, ethylene glycol and most of the water are removed by vacuum distillation, and finally dried to obtain vegetable oleic acid Ester alcohol;
[0048] (2) Synthesis of PU prepolymer: Add 1 mol of polyethylene glycol in sequence in the reaction kettle, stir and heat up to 125°C, dehydrate under reduced pressure for 2 hours and then cool down to 65°C, then add 1 mol of hexamethylene diisocyanate and catalyst For the mixture of dibutyltin dilaurate, pay attention to control the dropping rate, preferably drop it in 2 hours. After 2...
Embodiment 3
[0051] (1) Synthesis and separation and purification of vegetable oleic acid ester alcohol: after heating 1 mol of sesame oil to 70°C, add 8 mol of ethylene glycol alkaline solution, under the condition of stirring, reflux reaction for 70min, then add an appropriate amount of acid to neutralize, Let the reaction liquid stand still, separate layers, and separate the lower glycerin layer; then wash the upper liquid with water, remove the lower water phase, distill under reduced pressure to remove ethylene glycol and most of the water, etc., and finally dry to obtain vegetable oleic acid ester alcohol;
[0052] (2) Synthesis of PU prepolymer: Add 1 mol polypropylene glycol in sequence in the reaction kettle, stir and heat up to 115-125°C, dehydrate under reduced pressure for 2 hours, then cool down to 65°C, then add 1 mol of toluene diisocyanate and catalyst dilauric acid For the mixture of dibutyltin, pay attention to control the dropping rate, it is preferable to drop it in 2 h...
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