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Semicrystalline polyester resin for TGIC-cured high-leveling powdery paint and synthetic method thereof

A technology of powder coatings and polyester resins, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as high glass transition temperature and low melt viscosity, and achieve low melt viscosity, high melting point, and excellent mechanical properties Effect

Active Publication Date: 2014-01-01
GUANGZHOU KINTE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional amorphous polyester resins cannot meet the requirements of high glass transition temperature and low melt viscosity at the same time. Therefore, people have used the physical and chemical properties of semi-crystalline polymers to synthesize semi-crystalline polyester resins, effectively solving the problem of amorphous polymers. Ester resins cannot meet the problem of high glass transition temperature and low melt viscosity at the same time

Method used

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  • Semicrystalline polyester resin for TGIC-cured high-leveling powdery paint and synthetic method thereof
  • Semicrystalline polyester resin for TGIC-cured high-leveling powdery paint and synthetic method thereof
  • Semicrystalline polyester resin for TGIC-cured high-leveling powdery paint and synthetic method thereof

Examples

Experimental program
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Effect test

Embodiment F

[0032] Example F: In a 10-liter reactor, add 1,6-hexanediol in the ratio listed in Table 1, heat up to the material melts; then add terephthalic acid and butyl tin oxide in sequence, and continue to heat up with nitrogen gas Reaction, esterification water starts to be generated and distilled at around 180°C, and then gradually rises to 250°C, and reacts for a total of 8-13 hours from the completion of feeding until 95% of the esterification water is discharged, and the acid value reaches 10-20mgKOH / g After vacuuming for 1~2h, the acid value after vacuuming is 5~8 mgKOH / g, then add acidolysis agent, react for 3~5h, the acid value reaches 38~45mgKOH / g, vacuumize for about 1~4h, and the acid value reaches 30-36mgKOH / g, after cooling down to 200°C, the sample polyester resin can be obtained by discharging.

[0033]Acid value: 30~36mgKOH / g; melting point: 100~130°C (DSC); 200°C melt viscosity (ICI cone and plate viscometer): 400~3000mPa·s; crystallinity: 0~60% (XRD).

Embodiment G

[0034] Example G: For Example G, its synthesis process is as follows: In a 10-liter reactor, add 1,6-hexanediol in the proportion listed in Table 1, heat up to the melting of the material; then add terephthalic acid, For butyl tin oxide, nitrogen gas continues to heat up the reaction, esterification water begins to form and distill out around 180°C, and then gradually heats up to 250°C, when the internal temperature of the reactor reaches 250°C, add a proportion of trimethylolpropane and keep it warm Reaction, react for 8-13 hours in total from the start of feeding, until 95% of the esterified water is discharged, the acid value reaches 10-20mgKOH / g, then add acidolysis agent, react for 3-5h, the acid value reaches 38-45mgKOH / g , vacuum polycondensation for about 1-4 hours, the acid value reaches 30-36 mgKOH / g, then cool down to 200 ° C, and then the sample polyester resin can be obtained by discharging.

[0035] Acid value: 30~36mgKOH / g; melting point: 100~130°C (DSC); 200°C ...

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Abstract

The invention discloses a semicrystalline polyester resin for a TGIC-cured high-leveling powdery paint. The resin is prepared through melt phase polycondensation of the following components by weight: 29 to 45% of polyol, 45 to 65% of aromatic polyprotic acid, 5 to 15% of an acidulate agent and 0.01 to 0.15% of an esterification catalyst. The polyester resin has an appropriate degree of crystallinity, a high melting point, low viscosity and excellent storage stability; the prepared powdery paint has excellent leveling performance and mechanical properties, and a coating of the powdery paint basically has no orange peel. The invention also discloses a synthetic method for the semicrystalline polyester resin used for the TGIC-cured high-leveling powdery paint.

Description

technical field [0001] The invention relates to a semi-crystalline polyester resin for powder coatings, in particular to a semi-crystalline polyester resin for TGIC solidified high-leveling powder coatings. The present invention also relates to a synthesis method of the semi-crystalline polyester resin. Background technique [0002] After years of development, powder coatings have made great progress, and their market share and application fields have been expanding year by year. However, powder coatings also have structural defects, the most fundamental reason of which is due to the most critical component of powder coatings, polyester resin. Yes, traditional powder coatings mainly use amorphous polyester resins. A notable feature of amorphous polyester resins is that their glass transition temperature and melt viscosity show a positive correlation, that is, the greater the viscosity, the higher the glass transition temperature. For powder coatings, it is expected that the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/199C08G63/20C08G63/85C09D167/02C09D5/03
Inventor 李勇顾宇昕何涛刘亮许佐航
Owner GUANGZHOU KINTE IND
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