A kind of non-ionic water-based curing agent based on bio-based pentamethylene diisocyanate and preparation method thereof
A pentamethylene diisocyanate, water-based curing agent technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of complex production and preparation process, large environmental pollution, and the synthesis process depends on fossil resources, etc., and achieves the operation process. Easy to grasp, high gloss value, good storage stability
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Embodiment 1
[0039] The preparation method of the nonionic water-based curing agent based on bio-based pentamethylene diisocyanate of the present embodiment may further comprise the steps:
[0040] 1) The bio-based pentamethylene diisocyanate trimer was distilled under reduced pressure for 30 minutes with a rotary evaporator at a pressure of 10 mbar and a temperature of 120° C., and the heavy components after the reduced-pressure distillation were collected to obtain impurity-removed Bio-based pentamethylene diisocyanate trimer;
[0041] 2) Then add the bio-based pentamethylene diisocyanate trimer after the impurity removal in the 200g step 1) to the four-necked flask, and add 26g of polyethylene glycol monomethyl ether after the dehydration treatment at one time, and its molecular weight is 450, then stirred in a nitrogen atmosphere and raised the temperature to 80°C to fully react for 6 hours, and when the product in the bottle was clear and transparent, the temperature was lowered to 25...
Embodiment 2
[0045] The preparation method of the nonionic water-based curing agent based on bio-based pentamethylene diisocyanate of the present embodiment may further comprise the steps:
[0046] 1) Distill the bio-based pentamethylene diisocyanate trimer with a rotary evaporator at a pressure of 20 mbar and a temperature of 150° C. for 1 h, collect the heavy components after vacuum distillation, and obtain impurity-removed Bio-based pentamethylene diisocyanate trimer;
[0047] 2) Add 600g of bio-based pentamethylene diisocyanate trimer after removing impurities in step 1) to the four-necked flask, add 68g of dehydrated polyethylene glycol, its molecular weight is 400, then stir and heat up to Fully react at 60°C for 4 hours, cool down when the substance in the bottle is clear and transparent, discharge the material after reaching 30°C, take a sample and titrate, and the dehydration treatment of the polyethylene glycol is specifically: adding molecular sieves to the polyethylene glycol ...
Embodiment 3
[0050] The preparation method of the nonionic water-based curing agent based on bio-based pentamethylene diisocyanate of the present embodiment may further comprise the steps:
[0051] 1) Distill the bio-based pentamethylene diisocyanate trimer with a rotary evaporator at a pressure of 30 mbar and a temperature of 170° C. for 1 h, collect the heavy components after vacuum distillation, and obtain impurity-removed Bio-based pentamethylene diisocyanate trimer;
[0052] 2) Add 450 g of the bio-based pentamethylene diisocyanate trimer after the impurity removal in step 1) to the four-necked flask, and add 96 g of dehydration-treated polyethylene glycol monomer dropwise within 40 minutes with a constant pressure funnel. Methyl ether (molecular weight: 200), then stir and heat up to 100°C under an argon atmosphere to fully react for 5 hours, cool down to 40°C when the material in the bottle is clear and transparent, discharge, sample and titrate to obtain; the polyethylene diethyl e...
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Abstract
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