A kind of water-based polyurethane modified epoxy itaconic acid resin cured by ultraviolet light and preparation method thereof
A technology of epoxy itaconic acid and waterborne polyurethane, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of limiting the application field of waterborne UV epoxy itaconic acid resin, high brittleness and poor flexibility of cured film, etc. Achieve good flexibility, good film-forming performance and good stability
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[0025] A preparation method for UV curing water-based polyurethane modified epoxy itaconic acid resin, comprising the following steps:
[0026] 1) Synthesis of epoxy itaconic acid resin: Mix itaconic acid, epoxy resin, co-solvent, polymerization inhibitor and catalyst a, heat up to 80-120°C, and stir to measure the acid value until the acid value is no longer Change, stop reaction, make product A;
[0027] 2) Synthesis of -NCO-terminated polyurethane semi-adducts: Add polyglycol and polyisocyanate according to the molar ratio of -NCO and -OH groups (1.9 to 2.5): 1, stir evenly, and measure the initial -NCO content, then add catalyst b, raise the temperature to 60-75°C and stir until the -NCO content becomes 0.4-0.6 times of the initial value, then stop the reaction to obtain product B;
[0028] 3) After cooling product A to 40-60°C, add product B to product A, mix well, and when the -NCO reaction is complete, add alkali to neutralize, and obtain a UV-cured water-based polyure...
Embodiment 1
[0077] 1) Add 13.1g itaconic acid, 20g epoxy E51, 4g cosolvent butyl methacrylate, 0.0334g p-hydroxyanisole and 0.334g catalyst three to a four-necked flask equipped with stirring paddle, condenser tube and thermometer For phenylphosphine, raise the temperature to 95°C, stir at a constant temperature, measure the acid value at regular intervals, stop the reaction until the acid value no longer changes, and obtain product A.
[0078] The measuring method of above-mentioned acid value is:
[0079] Accurately weigh 0.5-1.0g of the resin to be tested in a 250ml Erlenmeyer flask, add 20ml of acetone or absolute ethanol to dissolve it completely, add 2-3 drops of phenolphthalein indicator dropwise, and titrate with 0.1mol / L KOH-ethanol solution To pink and not fade in 30s, it is the end point of titration;
[0080] Acid value calculation method:
[0081]
[0082] In the formula: A is the acid value, mgKOH / g; C is the concentration of KOH-ethanol solution, mol / L; V is the volume...
Embodiment 2
[0096] 1) Add 12.6g itaconic acid, 20g epoxy resin E51, 4g cosolvent trimethylolpropane triacrylate, 0.0356 polymerization inhibitor hydroquinone to a four-necked flask equipped with stirring paddle, condenser tube and thermometer And 0.356 catalyzer N, N-dimethylbenzylamine, be warming up to 110 ℃, constant temperature stirs, measure acid value (acid value measuring method is as described in Example 1) at regular intervals, until acid value reaches theoretical acid value , Stop the reaction to obtain product A.
[0097] 2) Add 20g polypropylene glycol (PPG2000) and 5.33g isophorone diisocyanate (IPDI) to a three-necked flask equipped with a stirring paddle, a condenser tube, and a thermometer and heat up to 65°C. After stirring for 10 minutes, measure the initial -NCO value ( Measuring method is as described in Example 1), then add 0.1g catalyst dimethyl tin diacetate, react at a constant temperature and stir, measure the -NCO content every 20 minutes, until the -NCO content ...
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