A kind of preparation method of polyurethane reinforced epoxy resin photocuring coating
A technology of light-curing coatings and epoxy resins, applied in epoxy resin coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problem of low film volume shrinkage, few research reports, and limited epoxy coating effects and other problems, to achieve the effect of convenient coating preparation and excellent adhesion
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Embodiment 1
[0025] Take 100g of polyethylene glycol with a molecular weight of 1000 and 26g of TDI in a reaction flask, add 0.08g of dibutyltin dilaurate, heat the reaction at 60°C for 8h under nitrogen protection, then add 2.3g of glycidyl alcohol and 3.9g of methyl Hydroxyethyl acrylate, continue to stir the reaction for 5h, and cool down. Add 270g of epoxy resin E-44, 50g of 1,6-hexanediol diglycidyl ether, 30g of trimethylolpropane triacrylate, 0.3g of leveling agent and 0.3g of defoamer into the reaction bottle, and stir evenly. Take another 3.5g boron trifluoride monoethylamine, 3.5g triphenyliodonium salt, 0.35g 1-hydroxycyclohexyl phenyl ketone and dissolve them in 9mL mixed solvent, add them to the epoxy resin system prepared earlier, stir After uniformity, scrape coating to prepare a paint film, place at room temperature for 2 hours, and then UV cure for 1 minute to obtain a paint film.
Embodiment 2
[0027] Take 60g of polyethylene glycol with a molecular weight of 600 and 17g of TDI in a reaction flask, add 0.05g of dibutyltin dilaurate, heat the reaction at 60°C for 8h under the protection of nitrogen, then add 3.5g of glycidyl alcohol and 6g of methacrylic acid Hydroxyethyl ester, continue to stir the reaction for 5h, and cool. Add 200g of epoxy resin E-44, 10g of 1,6-hexanediol diglycidyl ether, 10g of trimethylolpropane triacrylate, 0.3g of leveling agent and 0.3g of defoamer into the reaction bottle, and stir evenly. Another 3.0g of boron trifluoride monoethylamine, 2.5g of hexafluoroantimonate, and 0.30g of 1-hydroxycyclohexyl phenyl ketone were dissolved in 8mL of mixed solvent, added to the previously prepared epoxy resin system, and stirred evenly Afterwards, scrape coating to prepare a paint film, place it at room temperature for 2 hours, and then cure it with ultraviolet light for 1 minute to obtain a paint film.
Embodiment 3
[0029] Take 200g of polyethylene glycol with a molecular weight of 2000 and 50g of MDI in a reaction flask, add 0.15g of dibutyltin dilaurate, heat the reaction at 80°C for 8h under nitrogen protection, then add 4.4g of glycidyl alcohol and 7.8g of methacrylic acid Hydroxyethyl ester, continue to stir the reaction for 5h, and cool. Add 2000g of epoxy resin E-44, 100g of 1,6-hexanediol diglycidyl ether, 100g of trimethylolpropane triacrylate, 3g of leveling agent and 3g of defoamer into the reaction bottle, and stir evenly. Another 23g of boron trifluoride monoethylamine, 18g of hexafluoroantimonate, and 2.1g of 1-hydroxycyclohexyl phenyl ketone were dissolved in 43mL of mixed solvent, and added to the previously prepared epoxy resin system. After stirring evenly, The paint film was prepared by scraping, and after standing at room temperature for 2 hours, it was cured by ultraviolet light for 1 minute to obtain a paint film.
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