Matting curing agent for epoxy resin powder coating and its preparation method and powder coating composition

A technology of epoxy resin powder and matting curing agent, which is applied in the field of powder coatings, can solve the problems of increased cost of use, and achieve the effects of less yellowing, good baking resistance, and reduced cost of use

Active Publication Date: 2016-09-14
HUANGSHAN ZHONGZE NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the price of pyromellitic acid has been rising all the way in recent years, the cost of using B68 matting curing agent has increased sharply, so it is urgent to develop a new type of matting curing agent to solve the problem of matting curing in epoxy resin systems

Method used

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  • Matting curing agent for epoxy resin powder coating and its preparation method and powder coating composition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prepare the matting curing agent of embodiment 1 according to the following method:

[0048] A. A copolymer of 60mol% fumaric acid and mesaconic acid (molar ratio 1:1, Mn=800-1200), 25mol% tartaric acid, 10mol% citric acid, 5mol% 1,2-diamino Cyclohexanetetraacetic acid is added into the reactor in turn, and then an appropriate amount of ethanol is added as a solvent, and mixed and stirred;

[0049] B. Add 5mol% ethylenediamine and 45mol% diethylenetriamine to the above polybasic acid. After mixing evenly, gradually heat up to the boiling point of ethanol at about 78°C for reflux reaction for 1h, then add 50mol% phthalate dropwise The ethanol solution of amine, the time of dropping is kept at 1h, and then the reflux reaction is carried out for 3h;

[0050] C. Finally, the ethanol solvent was removed by distillation, and the reaction mixture was lowered to room temperature to precipitate crystals, vacuum filtered and dried to obtain the product of Example 1.

Embodiment 2

[0052] Prepare the extinction curing agent of embodiment 2 according to the following method:

[0053] A. A copolymer of 80mol% fumaric acid and mesaconic acid (molar ratio 1:1, Mn=800-1200), 10mol% tartaric acid, 5mol% citric acid, 5mol% 1,2-diamino Cyclohexanetetraacetic acid is added into the reactor in turn, and then an appropriate amount of ethanol is added as a solvent, and mixed and stirred;

[0054] B. Add 10mol% ethylenediamine and 75mol% diethylenetriamine to the above-mentioned polybasic acid. After mixing evenly, gradually heat up to the boiling point of ethanol at about 78°C for reflux reaction for 2 hours, and then dropwise add 15mol% phthalate The ethanol solution of the amine, the dropping time is maintained at 1h, and then the reflux reaction is carried out for 4h;

[0055] C. Finally, the ethanol solvent was removed by distillation, and the reaction mixture was lowered to room temperature to precipitate crystals, vacuum filtered and dried to obtain the produ...

Embodiment 3

[0057] Prepare the matting curing agent of embodiment 3 according to the following methods:

[0058] A. A copolymer of 75mol% fumaric acid and mesaconic acid (molar ratio 1:1, Mn=800-1200), 15mol% tartaric acid, 7.5mol% citric acid, 2.5mol% 1,2- Add diaminocyclohexanetetraacetic acid into the reactor in turn, then add an appropriate amount of ethanol as a solvent, and mix and stir;

[0059]B. Add 30mol% ethylenediamine and 45mol% diethylenetriamine to the above-mentioned polybasic acid. After mixing evenly, gradually heat up to the boiling point of ethanol at about 78°C for reflux reaction for 1.5h, and then dropwise add 25mol% o-phthalic acid The ethanol solution of diamine, the time of dropping is maintained at 1h, and then reflux reaction is carried out for 5h;

[0060] C. Finally, the ethanol solvent was removed by distillation, and the reaction mixture was lowered to room temperature for crystallization, vacuum filtration and drying to obtain the product of Example 3.

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Abstract

The invention discloses an extinction curing agent for an epoxy resin powder coating. The extinction curing agent is prepared by reaction between polybasic acid and polyamine, wherein the polybasic acid consists of the following components: 60-80mol% of a copolymer containing fumaric acid and methylfumaric acid in a mole ratio of 1:1 and Mn of 800-1200, 10-25mol% of tartaric acid, 5-10mol% of citric acid, and 1-5mol% of 1,2-diamino-cyclohexane tetracetic acid; and the polyamine consists of the following components: 5-30mol% of ethidene diamine, 45-75mol% of diethylenetriamine and 10-55mol% of o-phenylenediamine. Besides, the invention also discloses a method for preparing the extinction curing agent and a powder coating composition containing the extinction curing agent. The extinction curing agent disclosed by the invention is good in extinction effect and stable in mechanical property, is good in baking resistance, cannot become yellow easily, and can basically achieve the extinction effect of a B68 extinction curing agent, and the use cost is significantly reduced.

Description

technical field [0001] The invention belongs to the field of powder coatings; in particular, it relates to an auxiliary agent for powder coatings and a preparation method thereof and a powder coating composition, in particular to a matting agent for a low-gloss epoxy resin powder coating and a preparation method thereof and a powder coating combination. technical background [0002] Traditional solvent-based coatings contain a large amount of volatile organic compounds (VOC), mainly organic solvents used as dispersion media. In the process of production and use, these organic solvents will volatilize into the atmosphere, pollute the atmosphere and bring harm to human health. Since its appearance in the 1970s, the development of solvent-free and environmentally friendly coatings has become a major trend in the coatings industry. Due to the advantages of no pollution, energy saving, high coating film strength, and full recovery of excess coatings, solvent-free powder coating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/12C09D5/03C09D163/00C08G59/44
CPCC08G59/44C09D5/03C09D7/65C09D163/00
Inventor 方向宏杨志萍王永垒汤增荣何领洪小平赵勇进
Owner HUANGSHAN ZHONGZE NEW MATERIAL CO LTD
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