Ultrahigh-acid-value polyester resin for powder coating and preparation method of polyester resin

A powder coating and polyester resin technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as poor storage stability and high glass transition temperature, and achieve good extinction effect and high glass transition temperature.

Inactive Publication Date: 2017-05-31
ANHUI SHENJIAN NEW MATERIALS
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of ultra-high acid value powder coating polyester resin and its preparation method, regulate and control the dosage ratio of raw material, under nitrogen protection, adopt organotin as esterification catalyst, by polybasic acid and polyhydric alcohol in organic Carry out esterification reaction and prepare by vacuum polycondensation method, the obtained polyester resin has an acid value of 250-300mgKOH / g, has a high glass transition temperature, and solves the problem of poor storage stability

Method used

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  • Ultrahigh-acid-value polyester resin for powder coating and preparation method of polyester resin
  • Ultrahigh-acid-value polyester resin for powder coating and preparation method of polyester resin
  • Ultrahigh-acid-value polyester resin for powder coating and preparation method of polyester resin

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Embodiment 1

[0024] A kind of ultra-high acid value powder coating polyester resin, its each component weight percent is as shown in table 1 below;

[0025] A preparation method of super high acid value powder coating polyester resin, comprising the following steps:

[0026] 1) The first stage: Put 970g of neopentyl glycol, 50g of ethylene glycol, 30g of diethylene glycol and 18g of trimethylolpropane into a 5L reactor, heat to 115°C and melt at a speed of 130-150r / min Stir, then add 1200g of terephthalic acid and 212g of isophthalic acid and 3g of monobutyltin oxide as an esterification catalyst, raise the temperature to 170-180°C, then raise the temperature to 245°C at a heating rate of 5°C / 30min, until the reactant Clear, the acid value of the sampling test sample is 17.2mgKOH / g;

[0027] 2) The second stage: control the temperature at 180°C, add 1230g of trimellitic anhydride and 70g of adipic acid, raise the temperature to 200°C and maintain until the reactants are clear, and the aci...

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Abstract

The invention provides ultrahigh-acid-value polyester resin for a powder coating and a preparation method of the polyester resin. Use amount ratio of raw materials is regulated, organotin is taken as an esterification catalyst, polyacid and polyol have an esterification reaction organically under protection of nitrogen, and the polyester resin is prepared with a vacuum polycondensation method. The acid value of the prepared ultrahigh-acid-value polyester resin for the powder coating is 250-330 mgKOH / g, the viscosity is 500-2,500 mpa.s@200 DEG C, the glass transition temperature Tg is higher than or equal to 48 DEG C, and the number-average molecular weight is 800-2,500. The polyester resin has the characteristics of ultrahigh acid value and high glass transition temperature and solves the problem of poor storage stability.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a super-high acid value powder coating polyester resin and a preparation method thereof. Background technique [0002] Conventional powder coating polyester resins can be used to prepare powder coatings for various coatings, such as high-gloss coatings, matte coatings, and texture coatings. When preparing some textured or low-gloss coatings, a functional polyester resin with an ultra-high acid value is required as a reactant to adjust the curing activity of the powder coating, and a variety of glossy matt powder coatings can be obtained. This ultra-high acid value powder coating polyester has high reactivity, which can increase the reactivity difference between the high reactivity and low reactivity parts in the powder coating components, so as to obtain low-gloss powder coatings. [0003] However, due to the high acid value of ultra-high acid value powder coatings, a large n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/02C09D5/03C09D7/12C08G63/672C08G63/668C08G63/20C08G63/78
CPCC08G63/20C08G63/668C08G63/672C08G63/78C09D5/03C09D167/02C09D7/48
Inventor 杨兆攀刘志坚
Owner ANHUI SHENJIAN NEW MATERIALS
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