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Preparation method of polyester resin for mixing type powdery coating

A technology of powder coating and polyester resin, which is applied in the direction of powder coating, polyester coating, coating, etc. It can solve the problems of not being able to meet the requirements of powder manufacturers, poor chemical solvent resistance and mechanical properties, and unstable resin performance. Achieve appropriate reactivity, good boiling resistance, and uniform molecular weight distribution

Inactive Publication Date: 2007-05-16
GUANGZHOU QINGTIAN INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the powder coating system mixed with polyester resin and epoxy resin in the ratio of 60:40 and 70:30 also appeared at a distance, but due to the reduction of curing density, it is better than 50:50 in terms of water boiling resistance, chemical solvent resistance and mechanical properties. The hybrid powder coating is poor, and the performance of the resin is unstable, which cannot meet the requirements of the powder manufacturer

Method used

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Examples

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Embodiment Construction

[0012] Some specific examples are listed below to illustrate the present invention. It should be pointed out that the following specific examples are only used to further illustrate the present invention, and do not represent limitations to the protection scope of the present invention. Some non-essential modifications and adjustments made by others according to the present invention still belong to the protection scope of the present invention.

[0013] In the 50 liters of reactors that are equipped with agitator and distillation column, start agitator, add neopentyl glycol, 1,4-cyclohexanedimethanol, 2-methyl-1 of the ratio listed in table 1, 3-Propanediol, ethylene glycol, trimethylolpropane, heat up until the material melts; then add terephthalic acid, adipic acid, dibutyltin oxide in sequence, continue to heat up the reaction with nitrogen, and esterify water at about 180°C Start to generate and distill out, control the temperature of the distillation column to be less th...

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Abstract

The invention discloses a preparing method of powder coating polymer resin, which is characterized by the following: condensing; adding polyatomic acid or acid anhydride from one or some composition of adipic acid, m-phthalic acid, terephthalic acid and trimellitic acid anhydride; possessing low fusing viscosity; improving levelling and mechanic property.

Description

technical field [0001] The invention relates to a preparation method of polyester resin for hybrid powder coating, in particular to a preparation method of carboxyl-terminated polyester resin for hybrid powder coating which is cured with epoxy resin in a ratio of 60:40. 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. At present, the most commonly used hybrid powder coating is mixed with polyester resin and epoxy resin at a ratio of 50:50. Although this type of powder coating has excellent performance, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/85C09D167/03C09D5/03
Inventor 刘亮顾宇昕张捷周年忠
Owner GUANGZHOU QINGTIAN INDAL
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