UV-curable urea-isobutyraldehyde-formaldehyde resin and preparation method thereof
A technology of formaldehyde resin and isobutyraldehyde, which is applied in the field of coatings, can solve the problems of hardness and adhesion to be improved, and achieve the effect of good hardness, fewer steps and high adhesion
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[0031] The present invention also provides a preparation method of UV-curable urea-isobutyraldehyde-formaldehyde resin, comprising:
[0032] a) dissolving urea-isobutyraldehyde-formaldehyde resin in an organic solvent, adding 3wt% to 10wt% hydrogen peroxide, and performing an oxidation reaction to obtain a compound of formula (III);
[0033]
[0034] b) Dissolving the compound of formula (III) and glycidyl acrylate and / or glycidyl (meth)acrylate in an organic solvent, under the protection of an antioxidant, carry out a catalytic reaction to obtain the compound having the formula (I) A UV-curable urea-isobutyraldehyde-formaldehyde resin having a structure and / or a structure represented by formula (II).
[0035] Among the present invention, the structural formula of urea-isobutyraldehyde-formaldehyde resin is:
[0036]
[0037] In the present invention, one of the chemical reaction formulas in the preparation method of UV-curable urea-isobutyraldehyde-formaldehyde resin i...
Embodiment 1
[0062] In this example, UV-curable urea-isobutyraldehyde-formaldehyde resin was prepared according to the following steps:
[0063] Step 1): In a clean and dry reactor, put 120g of urea-isobutyraldehyde-formaldehyde resin and 100g of acetone in sequence, heat up to 40°C, and stir until the urea-isobutyraldehyde-formaldehyde resin is dissolved in acetone;
[0064] Step 2): Dilute 68g of 30wt% hydrogen peroxide to 5wt% with deionized water, then put it into the reactor and stir at a high speed, so that the hydrogen peroxide and acetone can be mechanically dispersed in the reactor until uniform, and then slowly heat up to 65°C;
[0065] Step 3): keep warm for 3 hours, carry out oxidation reaction, the terminal aldehyde group of urea-isobutyraldehyde-formaldehyde resin is completely oxidized by diluted hydrogen peroxide, and discharge;
[0066] Step 4): Purify the obtained oxidized urea-isobutyraldehyde-formaldehyde resin, reduce the excess hydrogen peroxide with 21 g of sodium su...
Embodiment 2
[0069] In this example, UV-curable urea-isobutyraldehyde-formaldehyde resin was prepared according to the following steps:
[0070] Step 1): In a clean and dry reactor, put 120g of urea-isobutyraldehyde-formaldehyde resin and 100g of acetone in sequence, raise the temperature to 40°C, and stir until dissolved;
[0071] Step 2): Dilute 68g of 30wt% hydrogen peroxide to 5wt% with deionized water, then put it into the reactor and stir at a high speed, so that the hydrogen peroxide and acetone can be mechanically dispersed in the reactor to a uniform level, and then slowly raise the temperature to 65°C ;
[0072] Step 3): keep warm for 3 hours, carry out oxidation reaction, the terminal aldehyde group of urea-isobutyraldehyde-formaldehyde resin is completely oxidized by diluted hydrogen peroxide, and discharge;
[0073] Step 4): Purify the obtained oxidized urea-isobutyraldehyde-formaldehyde resin, reduce the excess hydrogen peroxide with 21 g of sodium sulfite, then extract with...
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