Easy-extinction type polyester resin, preparation method and application thereof
A technology of polyester resin and esterification, applied in the field of easy-to-dull polyester resin and its preparation, can solve the problem that mat-type polyester cannot produce qualified semi-gloss and high-gloss powder coatings, difficult-to-dull powder coatings, and is not suitable for high-gloss Powder coating preparation and other issues, to achieve good decorative and protective effects, reduce the effect of reflection
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Embodiment 1
[0066] 1) The first stage: mix the polyol and esterification catalyst according to the ratio in Table 1, heat to melt, then add polyacid, pass nitrogen and gradually raise the temperature to 244°C for esterification and polycondensation reaction, and detect the reactant after the material is clear The acid value is 19.8mgKOH / g;
[0067] 2) The second stage: lower the temperature of the kettle to 228°C, add 3-hydroxyvaleric acid to react for 70 minutes, then continue to add trimellitic anhydride to carry out acidification reaction for 100 minutes. After the material is clear, the acid value of the reactant is 63.2 mgKOH / g;
[0068] 3) The third stage: maintain the temperature in the kettle at 228°C, carry out the vacuum polycondensation reaction of the acidified product at a vacuum degree of -0.09Mpa for 80 minutes, and detect the acid value of the polycondensation product after the vacuum is released to be 52.5mgKOH / g;
[0069] 4) The fourth stage: after reducing the reaction ...
Embodiment 2
[0071] 1) The first stage: mix the polyol and esterification catalyst according to the ratio in Table 1, heat to melt, then add polybasic acid, blow nitrogen and gradually raise the temperature to 240°C for esterification and polycondensation reaction, and detect the reactant after the material is clear The acid value is 15.7mgKOH / g;
[0072] 2) The second stage: lower the temperature of the kettle to 230°C, add 4-hydroxy-3-methylpentanoic acid to react for 90 minutes, then continue to add trimellitic anhydride and pyromellitic anhydride for acidification reaction for 90 minutes, and detect the acid value of the reactant after the material is clear It is 66.2mgKOH / g;
[0073] 3) The third stage: maintain the temperature in the kettle at 230°C, carry out the vacuum polycondensation reaction of the acidified product at a vacuum degree of -0.092Mpa for 90 minutes, and detect the acid value of the polycondensation product after the vacuum is released to be 55.4mgKOH / g;
[0074] 4...
Embodiment 3
[0076] 1) The first stage: mix the polyol and esterification catalyst according to the ratio in Table 1, heat to melt, then add polybasic acid, blow nitrogen and gradually raise the temperature to 237°C for esterification and polycondensation reaction, and detect the reactant after the material is clear The acid value is 11.8mgKOH / g;
[0077] 2) The second stage: lower the temperature of the kettle to 235°C, add 2-propyl-3-hydroxypentanoic acid to react for 145 minutes, then continue to add pyromellitic anhydride for acidification reaction for 65 minutes, and the acid value of the reactant is 64.5 after the material is clear mgKOH / g;
[0078] 3) The third stage: maintain the temperature in the kettle at 235°C, carry out the vacuum polycondensation reaction of the acidified product at a vacuum degree of -0.096Mpa for 120min, and detect the acid value of the polycondensation product after the vacuum is released to be 53.4mgKOH / g;
[0079] 4) The fourth stage: after reducing the...
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