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Polyester resin for indoor powder paint and preparation method thereof

A technology of powder coating and polyester resin, applied in the direction of powder coating, carboxylate preparation, polyester coating, etc., can solve the problems of poor gloss, achieve low equipment cost, simple preparation method, excellent leveling performance and gloss Effect

Active Publication Date: 2017-02-08
安徽泰达新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these polyester resins have various shortcomings in the preparation and application, and cannot meet the above practical application requirements; at the same time, their gloss is generally poor

Method used

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  • Polyester resin for indoor powder paint and preparation method thereof
  • Polyester resin for indoor powder paint and preparation method thereof
  • Polyester resin for indoor powder paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First prepare the indoor powder coating polyester resin according to the following method, the method may further comprise the steps:

[0037] 1) Add pulverized polyester waste, neopentyl glycol and catalyst 1,3-diethylimidazolium fluoride borate in the reaction vessel, the weight of the three is 20g, 68g and 1.8g respectively;

[0038] 2) Stir the reaction mixture and allow it to heat up slowly at a rate of 14° C. / h;

[0039] 3) When the temperature is higher than 190°C, control the temperature of the reaction mixture between 190-210°C, and the reaction time is 5h;

[0040] 4) Cool down to 140-150°C, separate undegraded polyester waste; cool the residue to room temperature and dry to obtain a light yellow paste substance; the average molecular weight Mn of the light yellow paste substance is 574; hydroxyl value test The result was 196 mgKOH / g; 92% of the light yellow paste substance was Compound A.

[0041] 5) Add the above-mentioned light yellow pasty substance into...

Embodiment 2

[0045] First prepare the indoor powder coating polyester resin according to the following method, the method may further comprise the steps:

[0046] 1) Add pulverized polyester waste, neopentyl glycol and catalyst 1,3-diethylimidazolium borofluoride in the reaction vessel, the weight of the three is 20g, 75g and 2.2g respectively;

[0047] 2) Stir the reaction mixture and allow it to heat up slowly at a rate of 15° C. / h;

[0048] 3) When the temperature is higher than 190°C, control the temperature of the reaction mixture between 190-210°C, and the reaction time is 6h;

[0049] 4) Cool down to 140-150°C, separate undegraded polyester waste; cool the residue to room temperature and dry to obtain a light yellow paste substance; the average molecular weight Mn of the light yellow paste substance is 521; hydroxyl value test The result was 209 mgKOH / g; 86% of the light yellow paste substance was Compound A.

[0050] 5) Add the above-mentioned light yellow pasty substance into th...

Embodiment 3

[0054] First prepare the indoor powder coating polyester resin according to the following method, the method may further comprise the steps:

[0055] 1) Add pulverized polyester waste, neopentyl glycol and catalyst 1,3-diethylimidazolium borofluoride in the reaction vessel, the weight of the three is 20g, 84g and 2g respectively;

[0056] 2) Stir the reaction mixture and make it warm up slowly at a rate of 16° C. / h;

[0057] 3) When the temperature is higher than 190°C, control the temperature of the reaction mixture between 190-210°C, and the reaction time is 8h;

[0058] 4) Cool down to 140-150°C to separate undegraded polyester waste; the residue is cooled to room temperature and dried to obtain a light yellow paste substance; the average molecular weight Mn of the light yellow paste substance is 643; hydroxyl value test The result was 201 mgKOH / g; 88% of the light yellow paste substance was Compound A.

[0059] 5) Add the above-mentioned light yellow pasty substance into...

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Abstract

This invention discloses a polyester resin for indoor powder paint synthesized from crude trimellitic anhydride (with purity of 90-95%) and waste polyester material alcoholysate and a preparation method thereof. The method comprises the steps of: taking waste polyester as the raw material, adopting 1, 3-diethylimidazole fluoroborate as the catalyst, selecting the catalyst content and the process temperature to regulate the molecular weight and distribution of the obtained diol compound, and when the molecular weight and distribution are within an appropriate range, replenishing terephthalic acid, isophthalic acid and the catalyst according to the formula to complete stepwise polymerization reaction, and performing vacuum pumping to carrying out condensation polymerization reaction, and using crude trimellitic anhydride (with purity of 90-95%) to block the end, thus finally obtaining the polyester resin for indoor powder paint. The resin has low melt viscosity, high glass transition temperature, and narrow molecular weight distribution, and the powder paint prepared from the resin has leveling performance and luster superior to the prior art.

Description

technical field [0001] The invention belongs to the field of application of crude partial anhydride (purity of partial anhydride 90-95%) and recycling of polyester waste; it relates to a synthesis of crude partial anhydride (purity of partial anhydride 90-95%) and waste polyester materials by alcoholysis The obtained polyester resin for indoor powder coatings, its preparation method and powder coatings prepared therefrom. Background technique [0002] Polyester is mainly used in the production of fibers, polyester bottles and films. The sources of polyester waste are mainly waste materials, scraps, waste polyester bottles and polyester films generated during the production process. With the rapid development of the polyester industry, polyester waste is increasing day by day, reaching hundreds of thousands of tons in China every year. Although these polyester wastes are not very toxic, they are light in weight and bulky and difficult to degrade under natural conditions, wh...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/183C08G63/181C08G63/91C08G63/85C09D167/02C09D163/02C09D5/03C07C67/29C07C69/82C07C27/02C07C31/20
CPCC07C29/095C07C67/29C08G63/181C08G63/183C08G63/20C08G63/85C08G63/916C09D5/03C09D167/02C08L63/00C07C69/82C07C31/20
Inventor 柯伯成王永垒柯伯留柯美松罗建立毕红辉
Owner 安徽泰达新材料股份有限公司
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