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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

Inactive Publication Date: 2004-11-10
GUANGZHOU QINGTIAN INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the orange peel of its powder coating is relatively serious, and the water vapor released during the curing reaction cannot be effectively discharged, and the coating pinhole phenomenon is serious, which greatly affects the popularization and use of polyester / hydroxyalkylamide powder coatings.
At present, the leveling properties of the powder coatings of the main foreign hydroxyalkylamide curing polyester resins have been improved, but the problems of pinholes and impact strength of the coatings have not been effectively resolved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] In a 50-liter reactor equipped with heating, stirring and distillation columns, add neopentyl glycol, 1,4-cyclohexanedimethanol, trimethylolpropane, 2-methyl - 1,3-propanediol, 1,6-hexanediol or ethylene glycol (for comparison) and water, heat and stir to dissolve, then add terephthalic acid, isophthalic acid, adipic acid and dibutyltin oxide in sequence , continue to heat up the reaction with nitrogen, start esterification at about 170°C and generate water to distill out, control the temperature of the distillation column to be less than 100°C, and then gradually heat in sections 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 to 20°C, add acidolysis agent isophthalic acid, and then gradually raise the temperature to Carry out the acid hydrolysis reaction at 240°C for about 3 hours. W...

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PUM

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Abstract

The invention discloses a polyester resin for hydroxyalkyl acidamide solidified powdery paints whose constituents and proportion by weight are, terephthalic acid 75-100, m-phthalic acid 5-25, adipic acid 3-25, neopentyl glycol 50-80, 2-methyl-1, 3- propylene glycol 0-20, 1, 6-hexandiol 0-20, 1, 4-cyclohexane dimethanol 2-20, trimethylolpropane 1-3, dibutyl tin oxide 0.1-0.2, water 2-5. The invention also discloses the process for preparing the polyester resin.

Description

Technical field [0001] The invention relates to a polyester resin for powder coatings, in particular to a polyester resin for hydroxyalkylamide cured powder coatings, and also relates to a preparation method of the polyester resin for powder coatings. Background technique [0002] TGIC (triglycidyl isocyanate) cured powder coatings have good weather resistance and excellent comprehensive performance, but due to the toxicity of TGIC, its application range is limited. The market has partially adopted β-hydroxyalkylamide curing agent to replace TGIC. Some literatures have reported the method of synthesizing such polyesters with polyhydric alcohols and polycarboxylic acid anhydrides under the catalysis of organotin catalysts. US Patent No. 4,801,680 discloses a method for preparing carboxyl-terminated polyester cured by hydroxyalkylamides with an acid value of about 33 mgKOH / g by using neopentyl glycol, trimethylolpropane, and Hexahydrophthalic Anhydride. However, the orange p...

Claims

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Application Information

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IPC IPC(8): C08G63/199C09D5/03C09D167/03
Inventor 陈龙才严来春张捷罗俊义杨锐龙周年忠
Owner GUANGZHOU QINGTIAN INDAL
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