Epoxy cured 70:30 polyester resin excellent in levelability and solvent resistance and preparation method thereof

A polyester resin and solvent-resistant technology, applied in epoxy resin coatings, polyester coatings, coatings, etc. Problems such as leveling on the surface of the film, to achieve the effect of high cross-linking density, excellent leveling, and prolonging the gelation time

Active Publication Date: 2019-05-31
安徽永利新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the high activity of the carboxyl group in the 70:30 hybrid powder coating polyester in the prior art, the gelation time is short, the softening point of the polyester resin and the high-temperature melt viscosity are relatively large, resulting in insufficient leveling of the final coating film surface and The defect that the conventional coating film that forms is poor in solvent resistance, in order to improve the leveling and solvent resistance of 70:30 mixed type powder coating, the object of the present invention is to provide a kind of epoxy curing 70 with excellent leveling property and solvent resistance : 30 polyester resin and preparation me

Method used

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  • Epoxy cured 70:30 polyester resin excellent in levelability and solvent resistance and preparation method thereof
  • Epoxy cured 70:30 polyester resin excellent in levelability and solvent resistance and preparation method thereof
  • Epoxy cured 70:30 polyester resin excellent in levelability and solvent resistance and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0031] Example 1

[0032] An epoxy cured 70:30 polyester resin with excellent leveling and solvent resistance. Its raw material composition and molar ratio are as follows:

[0033]

[0034]

[0035] A method for preparing the epoxy cured 70:30 polyester resin with excellent leveling and solvent resistance, including the following steps:

[0036] A. Add the formula amount of 1,9-nonanediol, neopentyl glycol and 1,2,6-hexanetriol into the reaction kettle, and heat and melt at 125℃ or below, stir and mix evenly;

[0037] B. Add the formulated amount of terephthalic acid and catalyst to the above mixture, slowly raise the temperature to 170°C at a heating rate of 5°C / h and keep the temperature for 2h. When the esterification water is not obvious, start the vacuum and keep the vacuum at React for 2h under the condition of 70mmHg, then remove the vacuum, add the formula amount of myristic acid, polyethylene glycol trimethoxysilyl propyl ether and glyceryl monocaprate, under the protection o...

Example Embodiment

[0041] Example 2

[0042] An epoxy cured 70:30 polyester resin with excellent leveling and solvent resistance and a preparation method thereof. The raw material composition and molar ratio are as follows:

[0043]

[0044] The preparation method and others are the same as in Example 1.

[0045] The prepared polyester resin acid value: 31 mgKOH / g, melt viscosity (200° C.): 4075 mPa·s.

Example Embodiment

[0046] Example 3

[0047] An epoxy cured 70:30 polyester resin with excellent leveling and solvent resistance and a preparation method thereof. The raw material composition and molar ratio are as follows:

[0048]

[0049]

[0050] The preparation method and others are the same as in Example 1.

[0051] The prepared polyester resin acid value: 38 mgKOH / g, melt viscosity (200° C.): 3820 mPa·s.

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Abstract

The invention relates to an epoxy cured 70:30 polyester resin excellent in levelability and solvent resistance, and a preparation method thereof, and belongs to the technical field of power paint chemistry. According to the preparation method, long chain flexible raw materials such as tetradecanedioic acid are adopted, so that polyester melting viscosity is reduced effectively, and coating film surface levelability is improved; high-functionality fluorine-containing end-capping reagent tetra(3, 4, 5, 6-tetrafluorophthalic acid) pentaerythritol ester is adopted for polyester end capping to reduce polyester resin carboxyl end group activity, reducing curing speed with E-12 epoxy resin, prolonging gelling time, ensuring enough leveling time, and achieving excellent cured coating film levelability; the end capping reagent is extremely high in functionality, so that cured coating film crosslinking density is large; end capping reagent self fluorine content is high, so that the cured coatingfilm possesses excellent resistance on routine organic solvents; the epoxy cured 70:30 polyester resin is applied in powder paint, so that coating layers excellent in levelability and solvent resistance are obtained. The raw materials are easily available, operation of the preparation process is simple and convenient, the preparation method is suitable for large scale production, and it is benefical for improvement of powder paint popularization and applications.

Description

technical field [0001] The invention relates to a polyester resin for powder coatings and a preparation method thereof, in particular to an epoxy-cured 70:30 polyester resin with excellent leveling properties and solvent resistance and a preparation method thereof, belonging to the technical field of powder coating chemical industry. Background technique [0002] Powder coating has the characteristics of economy, environmental protection and excellent performance, and has attracted more and more attention from people. Among them, hybrid powder coatings account for more than 80% of the total powder coatings. Considering energy saving and consumption reduction and coating substrate factors, hybrid powder coatings have become a new development direction of the powder coating industry and are widely used in household appliances, hardware Components, metal furniture and other fields. [0003] Hybrid powder coatings are also called polyester-epoxy hybrid powder coatings, which ca...

Claims

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Application Information

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IPC IPC(8): C08G63/695C08G63/682C08G63/78C08G63/85C09D167/02C09D163/00C09D5/03
Inventor 余利军余洪涛朱学刚
Owner 安徽永利新材料科技有限公司
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