All-polyester resin for HAA curable coil powder coating and preparation method thereof
A technology of powder coating and polyester resin, applied in the field of polyester resin, can solve the problems of decreased impact resistance, insufficient weather resistance and poor bending performance of the coating, and achieve the effect of good hardness
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[0017] The present invention will be described below in conjunction with examples. Table 1 is an example of polyester resin. In the reactor, add neopentyl glycol, trimethylolpropane, trimethylolethane, tris(2-hydroxyethyl) isocyanurate in the proportions listed in Table 1, and heat up to the material Melt; then add terephthalic acid and butyl tin oxide, and continue to heat up the reaction by blowing nitrogen gas. The esterified water begins to be generated and distilled at around 185°C, and then gradually rise to 240°C, and react for 10 to 13 hours to 95% of the esterified water After discharge, the acid value reaches 20-24mgKOH / g, add acidolytic agent isophthalic acid or adipic acid, react for 2.5-4h, the acid value reaches 80-85mgKOH / g, vacuum polycondensation about 2.5-4h, the acid value reaches 68~74mgKOH / g, the reaction can be stopped.
[0018] Average functionality of polyester resin: 1.85~1.95; acid value: 68~74mgKOH / g; glass transition temperature: 60~65℃; softening poi...
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