Polyester resin for hydroxyalkyl amide cured powder paint and process for preparing the same
A technology of hydroxyalkylamide and powder coatings, which is applied in powder coatings, polyester coatings, coatings, etc., and can solve the problems affecting the promotion and use of polyester/hydroxyalkylamide powder coatings and coating pinholes. The impact strength is not obtained. Effectively solve the problems such as water vapor cannot be effectively discharged, and achieve the effects of excellent thick film pinholes, improved impact strength, and improved coating leveling
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[0022] In a 50-liter reactor equipped with heating, stirring and distillation columns, add neopentyl glycol, 1,4-cyclohexanedimethanol, trimethylolpropane, 2-methyl glycol in the proportions listed in Table 1 -1,3-Propanediol, 1,6-hexanediol or ethylene glycol (for comparison) and water, after heating and stirring to dissolve, add terephthalic acid, isophthalic acid, adipic acid and dibutyltin oxide in turn , continue to heat up the reaction through nitrogen, start esterification at about 170 ° C and generate water to distill, control the temperature of the distillation column to be less than 100 ° C, and then gradually heat in stages to carry out the esterification reaction: heating at 170 ~ 180 ° C for 2 hours; heating at 180 ~ 220 ° C 4 hours; heating at 220-230°C for 1 hour; heating at 230-245°C for 4-5 hours, when the acid value reaches 10-13mgKOH / g, after cooling down by 20°C, add acidolyzing agent isophthalic acid, and then gradually heat up to The acid hydrolysis react...
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