Modified polyester/acrylate resin hybrid aqueous dispersion and preparation method thereof, and varnish and colored paint for baking varnish
A technology of modifying polyester and acrylate, which is applied in the direction of coating, etc., can solve the problems of resistance (water resistance, poor acid and alkali resistance, water resistance, weather resistance, poor storage stability, etc., and achieve chemical resistance improvement, high chemical resistance, etc. The effect of product resistance and high hardness
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Embodiment 1
[0071] Add 268g of trimethylolpropane, 684g of ε-caprolactone, and 0.2g of isopropyl titanate into a reactor containing a heating device, a condensing device, a stirring device and a negative pressure device, blow nitrogen and raise the temperature to 130°C for 4.0 Hours, polymer P1-1 was obtained, the number average molecular weight of the polymer was 476, and the hydroxyl value was 353 mg KOH / g.
[0072] Add 268g of trimethylolpropane, 456g of ε-caprolactone, and 0.2g of isopropyl titanate into a reactor containing a heating device, a condensing device, a stirring device and a negative pressure device, blow nitrogen and raise the temperature to 130°C for 4.0 hours, polymer P1-2 was obtained, the number average molecular weight of the polymer was 362, and the hydroxyl value was 464 mg KOH / g.
Embodiment 2
[0074] Add 760g of propylene glycol, 6840g of ε-caprolactone, and 0.5g of isopropyl titanate into a reactor containing a heating device, a condensing device, a stirring device and a negative pressure device, blow nitrogen and raise the temperature to 140°C for 4.0 hours to obtain a polymerization The polymer P2-1 has a number average molecular weight of 760 and a hydroxyl value of 147 mg KOH / g.
[0075] Add 900g of 1,4-butanediol, 7980g of ε-caprolactone and 0.5g of isopropyl titanate into a reactor containing a heating device, a condensation device, a stirring device and a negative pressure device, blow nitrogen and raise the temperature to 130°C for 4.0 hours, polymer P2-2 was obtained, the number average molecular weight of the polymer was 890, and the hydroxyl value was 125 mg KOH / g.
Embodiment 3
[0077] 146g polymer P1-1 (obtained in embodiment 1), 600gCHDM, 700g phthalic anhydride, 50g maleic anhydride are added in the reactor containing heating device, condensation device, stirring device and negative pressure device, Blow nitrogen and heat up to 150°C to start stirring, react until there is reflux and dehydration, then heat to 220°C in a heating mode of 10°C / hour gradually to carry out condensation polymerization to obtain a polyester resin with an acid value of 60mg KOH / g, and then Add 146 g of polymer P2-1 (obtained in Example 2) and continue the reaction until the acid value is 20 mg KOH / g to obtain a modified polyester. The number average molecular weight of the obtained modified polyester was 2536; the hydroxyl value was 62 mg KOH / g.
[0078] Add 50g of DBG and 146g of modified polyester together into a 1L reactor containing a heating device, a condensing device and a stirring device and heat it up to 140°C. When the temperature of the initial material reaches ...
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Abstract
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