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Composite curing agent for polyester powder coating and its preparation method and application

A composite curing agent and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of human germ cell mutation, heredity, thick coating pinholes, etc., and achieve high epoxy equivalent, comprehensive Excellent performance, less irritating effect

Active Publication Date: 2022-01-04
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, in recent years, it has been found that TGIC curing agent has potential sensitization and will cause mutations in human germ cells and is hereditary. Most countries in the European Union have banned the use of TGIC as a curing agent
However, powder coatings with HAA as curing agent always have defects such as thick coating pinholes and easy yellowing.

Method used

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  • Composite curing agent for polyester powder coating and its preparation method and application
  • Composite curing agent for polyester powder coating and its preparation method and application
  • Composite curing agent for polyester powder coating and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Composite curing agent for polyester resin powder coatings described in the present embodiment, its preparation raw material comprises following components:

[0023]

[0024] The preparation method of composite curing agent for polyester type resin powder coating described in the present embodiment comprises the steps:

[0025] (1) Add the organic solvent, triglycidyl trimellitate, and hydroxyl polyester resin in the recipe amount into the reaction kettle, heat up to 80°C and mix thoroughly, keep warm for 3 hours until completely dissolved into one phase; then add the recipe amount Diglycidyl terephthalate, crystalline epoxy resin, heat preservation reaction at 90°C for 4 hours, then add dicyclopentadiene dioxide for reaction, heat up to 110°C and heat preservation reaction for 6 hours, until all become homogeneous , lower the temperature to 70°C, add the prescribed amount of trimesic acid triglycidyl, continue to keep warm at 70°C for 1 hour, and stop the reaction a...

Embodiment 2

[0029] Composite curing agent for polyester resin powder coatings described in the present embodiment, its preparation raw material comprises following components:

[0030]

[0031]

[0032] The preparation method of composite curing agent for polyester type resin powder coating described in the present embodiment comprises the steps:

[0033] (1) Add the organic solvent, triglycidyl trimellitate, and hydroxyl polyester resin in the recipe amount into the reaction kettle, heat up to 90°C and mix thoroughly, keep warm for 1 hour until completely dissolved into one phase; then add the recipe amount Diglycidyl terephthalate, crystalline epoxy resin, heat preservation reaction at 95°C for 2 hours, then add dicyclopentadiene dioxide for reaction, heat up to 120°C and heat preservation reaction for 2 hours, until all become homogeneous , lower the temperature to 70°C, add the amount of trimesic acid triglycidyl tricarboxylate, continue the heat preservation reaction at 70°C fo...

Embodiment 3

[0037] Composite curing agent for polyester resin powder coatings described in the present embodiment, its preparation raw material comprises following components:

[0038]

[0039]

[0040] The preparation method of composite curing agent for polyester type resin powder coating described in the present embodiment comprises the steps:

[0041] (1) Add the organic solvent, triglycidyl trimellitate, and hydroxyl polyester resin in the recipe amount into the reaction kettle, heat up to 85°C and mix thoroughly, keep warm for 2 hours until completely dissolved into one phase; then add the recipe amount Diglycidyl terephthalate, crystalline epoxy resin, heat preservation reaction at 92°C for 3 hours, then add dicyclopentadiene dioxide for reaction, raise the temperature to 115°C and heat preservation reaction for 4 hours, until all become homogeneous , lower the temperature to 70°C, add the amount of trimesic acid triglycidyl, continue to keep warm at 70°C for 2 hours, and sto...

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Abstract

The invention belongs to the technical field of powder coatings, in particular to a composite curing agent for polyester powder coatings, and further discloses its preparation method and application. The composite curing agent for polyester resin powder coatings according to the present invention mainly consists of trimellitic acid triglycidyl ester and terephthalic acid diglycidyl ester as main raw materials, and selectively adds trimellitic acid triglycidyl ester It is prepared by mixed reaction of glycidyl ester, hydroxyl polyester resin, dicyclopentadiene dioxide and / or crystalline epoxy resin. The composite curing agent for the polyester resin powder coating has a good curing effect, and the mechanical properties of the obtained coating are stable, and also has good water boiling resistance; when it is cured with the polyester resin, its product performance fully reaches The curing effect of the current TGIC and HAA curing agent can be mixed with the existing TGIC or HAA products, and the comprehensive performance is better.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, in particular to a composite curing agent for polyester powder coatings, and further discloses its preparation method and application. 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 important development di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/63C09D7/65C09D5/03C09D167/00
Inventor 柯伯成柯伯留汪永辉罗建立柯美松徐小买周晔
Owner 安徽泰达新材料股份有限公司
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