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Preparation method of polyester resin for powder coating

A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as high resin melt viscosity, affecting coating leveling, resin curing performance, etc., to achieve good mechanical properties, Effect of low hydroxyl value and low melt viscosity

Inactive Publication Date: 2006-05-03
GUANGZHOU QINGTIAN INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, these methods adopt the method of atmospheric compression polymerization and vacuum polycondensation in the later stage to prepare carboxyl-terminated polyester resins, but due to the limitation of the preparation method, the prepared resin contains a certain amount of hydroxyl groups, which affects the curing performance of the resin. High melt viscosity affects the leveling of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] In a 50-liter reaction kettle equipped with a heating device, a stirrer and a distillation column, add neopentyl glycol, 1,4-cyclohexanedimethanol, trimethylolpropane, 2- Methyl-1,3-propanediol, ethylene glycol, after heating and stirring to dissolve, add terephthalic acid, isophthalic acid, adipic acid and dibutyltin oxide in sequence, continue to heat up the reaction with nitrogen gas, and start esterification at about 180°C The temperature of the distillation column is controlled to be less than 100°C, and then gradually heated in sections for esterification reaction: heating at 180-220°C for 4 hours; heating at 220-230°C for 3 hours; heating at 230-250°C for 4-5 hours , when the esterification rate reaches more than 95%, and the acid value reaches 10-16 mgKOH / g, vacuumize for polycondensation reaction; when the acid value reaches 2-6 mgKOH / g, add the acidolysis agent isophthalic acid, and then gradually heat up to 240 Carry out the acid hydrolysis reaction at ℃ for ...

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Abstract

The invention discloses a preparation method for polyester resin in powder coating, which comprises: on reaction late, adding the terminated agent selected one or more from acetic acid, benzoic acid, phosphoric acid and AA. This product has low melt viscosity and hydroxyl value, and has well level and mechanical properties.

Description

technical field [0001] The invention relates to a preparation method of polyester resin for thermosetting powder coating. Background technique [0002] Powder coating is a green coating produced without volatile organic solvents. Because of its characteristics of resource saving, solvent-free, low pollution, high efficiency, one-time coating molding, and wide application fields, it has developed rapidly in countries all over the world. About 80% of the thermosetting powder coating market uses polyester resin as the main film-forming substance, including polyester-epoxy hybrid powder coatings, weather-resistant polyester powder coatings, etc. A large number of documents have reported the method of directly esterifying polyester resins with polyols and polybasic acids / acid anhydrides as catalysts. Chinese patent CN1296048A discloses a preparation method of polyester resin for weather-resistant powder coatings, which uses no β-H monomer and aryl hydrogenated monomer as synthet...

Claims

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Application Information

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IPC IPC(8): C08G63/78C09D5/03C09D167/00
Inventor 顾宇昕张捷刘亮
Owner GUANGZHOU QINGTIAN INDAL
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