A kind of preparation method of waterborne MDI modified polyester photocurable resin
A light-curing resin and modified polyester technology, applied in polyester coatings, coatings, etc., can solve problems such as death and environmental pollution, and achieve the effects of high gloss, good wear resistance, and good storage stability
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Embodiment 1
[0014] a. In the reaction kettle, add 27 parts of 2,2-dimethylolpropionic acid and 3 parts of trimethylolpropane, pass through nitrogen protection, heat up to 130°C, add 0.2 parts of p-toluenesulfonic acid, keep warm After reacting for 4 hours, turn off the nitrogen gas, continue to react for 2 hours, and then cool to 40°C to prepare hyperbranched polyester for later use;
[0015] b. In the reaction kettle, add 20 parts of MDI-80 and 0.08 parts of dibutyltin dilaurate, raise the temperature to 30-40°C, add 9 parts of 2-hydroxyethyl acrylate monomer dropwise under stirring, and react for 0.5h Start sampling to detect the isocyanic acid value, and then take a sample every 0.5h. When the detected isocyanic acid value is 16.0 to 16.5% of NCO, add 4 parts of the hyperbranched polyester prepared in step a, and heat up to 50 to 60°C. Continue to react until the isocyanic acid value is less than 1%, then raise the temperature to 70-80°C, and proceed to the next step when the isocyanic...
Embodiment 2
[0018] A, step a is arranged in hyperbranched polyester reference example 1;
[0019] b. In the reaction kettle, add 15 parts of MDI-80 and 0.08 parts of dibutyltin dilaurate, raise the temperature to 30-40°C, add 7 parts of 2-hydroxypropyl acrylate monomer dropwise under stirring, and react for 0.5h Start sampling to detect the isocyanic acid value, and then take a sample every 0.5h. When the detected isocyanic acid value is 16.0-16.5% of NCO, add 3 parts of the hyperbranched polyester prepared in step a, and heat up to 50-60°C. Continue to react until the isocyanic acid value is less than 1%, then raise the temperature to 70-80°C, and proceed to the next step when the isocyanic acid value cannot be detected;
[0020] c. Add 4 parts of butanone to the reaction kettle in step b and stir. After the dissolution is complete, add 10 parts of N,N-dimethylaniline, heat up to 80°C, add 30 parts of 50% maleic anhydride butanone solution dropwise, and control The dropping time is 1h; ...
Embodiment 3
[0022] The water-based MDI modified polyester photocurable resin prepared in the embodiment of the present invention is formulated into a water-based UV varnish, and the formula is as follows: 60-65 parts of water-based MDI modified polyester photocurable resin, 5 parts of photoinitiator, and 0.2 parts of defoamer part, 0.3 part of base material wetting agent, 0.2 part of leveling agent, make up deionized water to 100; comparative example water-based TDI modified polyester photocurable resin is made into water-based UV varnish according to the above formula, and the coating is carried out according to relevant national standards In the performance comparison test, the coating film was cured by radiation for 10s, and the test results are shown in Table 1.
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