Water-based ultraviolet-thermal dual-curing coating and preparation method thereof
A UV and dual curing technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor water resistance and anti-foaming performance
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[0028] The water-based polyurethane acrylate of the present invention is nonionic water-based polyurethane acrylate modified by siloxane, and the preparation method comprises:
[0029] Step 1: reacting bisphenol A epoxy resin, polyethylene glycol and hydroxypropyl polydimethylsiloxane to obtain the first intermediate;
[0030] Step 2: reacting the first intermediate obtained in step 1 with diisocyanate to obtain a second intermediate;
[0031] Step 3: reacting the second intermediate obtained in Step 2 with the acrylate containing hydroxyl group to obtain water-based polyurethane acrylate.
[0032] Add bisphenol A epoxy resin, polyethylene glycol and hydroxypropyl polydimethylsiloxane to the reaction kettle as described in step 1 of the present invention to react to obtain the first intermediate, preferably at a reaction temperature of 120°C , the vacuum degree is under 0.098MPa, reacted under the condition of decompression and water removal for 1.5-3 hours; the bisphenol A e...
Embodiment 1
[0049] The first step, with 198g bisphenol A epoxy resin E51, 1000g polyethylene glycol (molecular weight=1000 Dalton, K + and Na + The total content of 20ppm;) and 2000g of hydroxypropyl polydimethylsiloxane (molecular weight = 2000 Daltons) were added to the reactor, the temperature was raised to 120°C, and the vacuum degree was 0.098MPa, and the water was removed under reduced pressure for 2 Hour;
[0050] In the second step, under nitrogen protection, drop the temperature of the reactor to 70°C, stir at a speed of 65rpm, and simultaneously add 696g of 2,4-toluene diisocyanate dropwise at a rate of 8ml / min. After the addition, the temperature Rising to 80°C, continue stirring for 1.5h;
[0051] After the third step and the second step reaction finished, add 1168g acetone to reduce the viscosity of the system in the reactor, meanwhile, add 1.168g catalyst dibutyltin dilaurate and 0.116g polymerization inhibitor p-hydroxyanisole, and the reaction temperature is controlled a...
Embodiment 2
[0053] The first step, with 378g bisphenol A epoxy resin E12, 5000g polyethylene glycol (molecular weight=5000 Dalton, K + and Na + The total content is 15ppm;) and 6000g of hydroxypropyl polydimethylsiloxane (molecular weight = 6000 Daltons) was added to the reactor, the temperature was raised to 120°C, and the vacuum degree was 0.098MPa, and the water was removed under reduced pressure for 2 Hour.
[0054] The second step, under the protection of nitrogen, lower the temperature of the reactor to 75°C, stir at a speed of 75rpm, and simultaneously add 1008g of diphenylmethane-4,4-diisocyanate dropwise at a rate of 12ml / min, and the addition is completed Afterwards, the temperature rose to 85°C, and the stirring reaction was continued for 2.5h;
[0055] After the third step and the second step reaction, add 4954g of acetone to the reactor to reduce the viscosity of the system. At the same time, add 6.193g of catalyst stannous octoate and 1.325g of polymerization inhibitor hyd...
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