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Mixed polyester resin and preparation method and powder coating thereof

A polyester resin and powder coating technology, applied in polyester coatings, powder coatings, coatings, etc., can solve the problems of poor coating film performance and darker resin color, and achieve stable gloss, clear and full surface, and smooth flow flat excellent effect

Active Publication Date: 2016-01-20
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After all, PET chips and other polyester wastes are used renewable resources, so they all contain more or less impurities. These impurities will not only cause the color of the resin to become darker, but also cause the performance of the coating film to deteriorate

Method used

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  • Mixed polyester resin and preparation method and powder coating thereof
  • Mixed polyester resin and preparation method and powder coating thereof
  • Mixed polyester resin and preparation method and powder coating thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The first stage: raise the temperature of the reactor to 85°C, start the stirring, and put in the formula amount of alcohol, acid, PET chip and esterification catalyst in sequence, close the reactor after feeding, slowly raise the temperature to 245°C, and maintain the reaction When the temperature at the top of the reaction kettle drops below 60°C, the acid value is 18 mgKOH / g by sampling;

[0026] (2) The second stage: reduce the temperature of the kettle to 230°C, continue the reaction for 1.5h under the vacuum degree of -0.098MPa, and take a sample to detect the acid value of 9mgKOH / g;

[0027] (3) The third stage: first lower the temperature of the kettle to 210°C and put in trimellitic anhydride, continue the reaction for 100 minutes, then lower the temperature to 190°C and put in the curing accelerator, continue to react for 30 minutes, and take samples to test the acid value and viscosity.

Embodiment 2

[0029] (1) The first stage: raise the temperature of the reactor to 90°C, start stirring, and put in the alcohol, acid, PET chip and esterification catalyst in the formula, close the reactor after feeding, slowly raise the temperature to 246°C, and maintain the reaction When the temperature at the top of the reaction kettle drops below 60°C, the acid value is 17 mgKOH / g by sampling;

[0030] (2) The second stage: lower the temperature of the kettle to 232°C, continue the reaction for 1.3h under the vacuum degree of -0.097MPa, and take a sample to detect the acid value and the acid value is 10mgKOH / g;

[0031] (3) The third stage: first lower the temperature of the kettle to 215°C and put in trimellitic anhydride, continue the reaction for 90 minutes, then lower the temperature to 195°C and put in the curing accelerator, continue to react for 25 minutes, and take samples to test the acid value and viscosity.

Embodiment 3

[0033] (1) The first stage: raise the temperature of the reactor to 90°C, start the stirring, and put in the formula amount of alcohol, acid, PET chip and esterification catalyst in sequence, close the reactor after feeding, slowly raise the temperature to 247°C, and maintain the reaction When the temperature at the top of the reaction kettle drops below 60°C, the acid value is 19 mgKOH / g by sampling;

[0034] (2) The second stage: reduce the temperature of the kettle to 233°C, continue the reaction for 1.2h under the vacuum degree of -0.096MPa, and take a sample to detect the acid value of 10mgKOH / g;

[0035] (3) The third stage: first lower the temperature of the kettle to 220°C and put in trimellitic anhydride, continue the reaction for 80 minutes, then lower the temperature to 200°C and put in the curing accelerator, continue to react for 27 minutes, and take samples to test the acid value and viscosity.

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PUM

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Abstract

The invention discloses a mixed polyester resin and a preparation method and a powder coating thereof. The raw components of the resin and the parts by weight thereof are as follows: 8.75 to 9.5 parts of alcohol, 11.5 to 12.5 parts of acid, 0.25 to 0.5 part of PET (polyester) chips, 0.02 part of esterification catalyst, 1.8 to 2.0 parts of trimellitic anhydride and 0.03 to 0.05 part of curing accelerator. The invention utilizes renewable resource degradation to produce the polyester resin, so the mixed polyester resin is economic and environment-friendly; the comprehensive property of coatings is good, the mixed polyester resin can be perfectly applied in the flatting powder coating, the gloss is stable, leveling is excellent, and the panel is clear and full.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a mixed polyester resin, a preparation method thereof, and a powder coating. Background technique [0002] At present, the production volume of high-molecular-weight polyester used in plastic bottles and engineering plastics is very large, and there are many corresponding waste materials, especially the recycled materials of polyester plastic bottles. Using these recycled materials to produce polyester resin for powder coatings is to make full use of recycled materials. resources and an effective way to reduce production costs. There are many processes for preparing polyester resin by degradation of PET chips. The more common method is to use PET chips to replace part of purified terephthalic acid and ethylene glycol. Put PET, polyol and polyacid together into the reactor for degradation-esterification and polycondensation reaction, then add polyacid for further rea...

Claims

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Application Information

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IPC IPC(8): C08G63/672C09D167/02C09D5/03
Inventor 翟春海
Owner ANHUI SHENJIAN NEW MATERIALS
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