Flexible UV photocureable coating, and preparation method and application thereof
A light-curing coating and flexible technology, which is applied in the direction of epoxy resin coating, polyurea/polyurethane coating, coating, etc., can solve the problem of coating flexibility, insufficient aging resistance, damage to the health of operators, and hidden dangers of production safety, etc. problems, to achieve the effect of easy coating dispersion, good elasticity, and increased flexibility
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[0034] Preparation Example 1:
[0035] (a) Add toluene diisocyanate and dibutyltin dilaurate at a molar ratio of 1:0.01 into the reactor, heat up to 40°C, and then dropwise add pentaerythritol triacrylate containing p-hydroxyanisole as a polymerization inhibitor (ensure -NCO :-OH molar ratio=2:1), react at 40℃ for 4h;
[0036] (b) Add a certain amount of dialkyl silicone oil (-NCO:-OH molar ratio = 1:1), continue to raise the temperature 70~75℃, test the reaction product by Fourier infrared spectroscopy, until the -NCO reaction is complete , Stop the reaction, and then the light-curable silicone acrylate can be obtained.
Example Embodiment
[0044] Preparation Example 5:
[0045] (a1) Add 2 mol of hexamethylene diisocyanate and the catalyst dibutyltin laurate into the reaction kettle, and raise the temperature to 40~50℃. In order to prevent gelation, slowly add 1 mol of polybutadiene diol to In the reactor, after reacting for 1 hour, the temperature is increased to 60°C;
[0046] (b1) Add 2mol each of hydroxy acrylate and polymerization inhibitor hydroquinone, heat up to 70~80℃, test the reaction product through Fourier infrared spectroscopy until the -NCO infrared peak disappears completely, at the same time, in order to reduce the viscosity of the polyurethane reaction After finishing, add 20% tripropylene glycol diacrylate to dilute and stir evenly to obtain polybutadiene urethane acrylate.
Example Embodiment
[0058] Example 1:
[0059] A super-flexible UV light-curable coating, the components in parts by weight are shown in Table 1;
[0060] The preparation steps of the coating described in this embodiment are as follows: first preheat 400 g of polybutadiene polyurethane acrylate, 200 g of silicone modified acrylate and 100 g of modified epoxy acrylate in an oven at 60°C for 6 hours. Increase the fluidity of the resin, and then add it to the reactor, and then add 215g of isobornyl acrylate (IBOA), stir at 600r / min for 1-2h, after stirring evenly, add 80g of 2-hydroxy-2- Methyl-1-phenyl-1-acetone (1173) and 5 g of defoamer were continuously stirred at 300 r / min and dispersed for 0.5 h to obtain the coating.
[0061] In the present invention, the UV light-curable coating is applied by spraying. Use a spray gun to spray a uniform paint film on the specified sample plate without blanks and overflow. The distance between the spray gun and the coated surface should not be less than 100mm duri...
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