A kind of epoxidized polyester resin and its preparation method and application

A technology of epoxidizing polyester and polyester resin, which is applied in the direction of polyester coating, powder coating, coating, etc., can solve the problems of corrosion of metal substrates, high cost, limiting the performance and stability of powder coatings, etc., and achieves reduction Effects of cost, good stability and boiling resistance

Active Publication Date: 2020-05-15
黄山市向荣新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned traditional powder coating system, since E-12 epoxy resin needs to use epichlorohydrin and sodium hydroxide as raw materials in the synthesis process, a certain amount of sodium chloride and hydrogen are contained in E-12 epoxy resin. Sodium oxide, which has a certain adverse effect on the boiling resistance of the final powder coating; at the same time, the presence of chloride ions also has a certain corrosion effect on the metal substrate; moreover, the E-12 epoxy resin itself The cost is relatively high
These all affect and limit the performance and stability of powder coatings to a certain extent

Method used

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  • A kind of epoxidized polyester resin and its preparation method and application
  • A kind of epoxidized polyester resin and its preparation method and application
  • A kind of epoxidized polyester resin and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The epoxidized polyester resin described in the present embodiment, based on the total amount of the epoxidized polyester resin, includes the raw material components in the following molar percentages:

[0027]

[0028] The preparation method of the epoxidized polyester resin described in the present embodiment may further comprise the steps:

[0029] (1) Add a selected amount of diethyl terephthalate, mercaptosuccinic acid and 12-hydroxystearic acid into the mixer, and control the temperature below 130°C for heating and melting;

[0030] (2) Add a selected amount of the dihydroxy-1-phenylethane, 2,5-dimethyl-2,5-hexanediol and neopentyl glycol into the above mixed material, and add a selected amount of the The catalyst is gradually heated up to 180°C under the protection of nitrogen, and a selected amount of glutamic acid is added to mix well, and then the temperature is slowly raised until no obvious distillate is evaporated, and the acid value of the reactant is l...

Embodiment 2

[0035] The epoxidized polyester resin described in the present embodiment, based on the total amount of the epoxidized polyester resin, includes the raw material components in the following molar percentages:

[0036]

[0037]

[0038] The preparation method of the epoxidized polyester resin described in this embodiment is the same as that in Example 1.

[0039] After testing, the acid value of the epoxidized polyester resin obtained in this example is 0.9 mgKOH / g, the epoxy equivalent is 842 g / mol, and the softening point is 101° C.

Embodiment 3

[0041] The epoxidized polyester resin described in the present embodiment, based on the total amount of the epoxidized polyester resin, includes the raw material components in the following molar percentages:

[0042]

[0043] The preparation method of the epoxidized polyester resin described in this embodiment is the same as that in Example 1.

[0044] After testing, the acid value of the epoxidized polyester resin obtained in this example is 0.5 mgKOH / g, the epoxy equivalent is 870 g / mol, and the softening point is 98° C.

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Abstract

The invention belongs to the technical field of powder coatings, particularly relates to an epoxidation polyester resin and further discloses a preparation method of the epoxidation polyester resin and application of the prepared powder material. The epoxidation polyester resin is prepared by copolymerizing the raw materials of diethyl terephthalate, glutamic acid, mercaptosuccinic acid, 12-hydroxy stearic acid, dyhydroxyl-1-ethyl benzene, 2,5-dimethyl-2,5-hexanediol, neopentyl glycol, resorcinol diglycidyl ether and the like, the acid value of the finally obtained polyester resin is lower than 2 mgKOH / g, the epoxide equivalent is 800-900 g / mol, the softening point is 85-105 DEG C, the polyester resin can substitute E-12 epoxy resin and the commercially available high-acid-value carboxyl polyester (the acid value is 48-52 mgKOH / g) to cure, a coating film completely reaches the requirement of the powder coating, and the prepared powder coating is better in stability and boiling resistance.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, specifically relates to an epoxidized polyester resin, and further discloses its preparation method and its application for preparing powder coatings. Background technique [0002] Powder coating is a 100% solid powder that does not contain organic solvents. It is different from oil-based paints and water-based paints. It does not use solvent or water as a dispersion medium when coating, but uses air as a dispersion medium to evenly coat the workpiece. The surface is a new type of environmentally friendly paint that forms a special-purpose coating film after heating. Powder coating has the advantages of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. With its advantages of economy, environmental protection, high efficiency and excellent performance, it is gradually replacing organic solvent-based coatings and has become an importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/91C08G63/688C08G63/685C09D167/00C09D5/03
CPCC08G63/685C08G63/688C08G63/91C09D5/03C09D167/00
Inventor 郑荣辉江蓉毕海鹏冯小浩王永垒张齐
Owner 黄山市向荣新材料有限公司
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