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Extinction curing agent for epoxy powder coating and preparation thereof

A technology of matting curing agent and epoxy powder, which is applied in the field of salts of polycarboxylic acids and imidazoline amine compounds, which can solve the problems of easy yellowing, sensitive gloss, poor mechanical properties, etc., and achieve stable and good mechanical properties. High temperature resistance, good matting effect

Inactive Publication Date: 2016-09-28
罗长青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a matting curing agent for powder coatings and a preparation method thereof. It is a new type of curing agent containing polybasic acid and organic amine structure, which solves the problems of easy yellowing, poor mechanical properties and glossiness during baking. Sensitive to polyester etc.

Method used

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  • Extinction curing agent for epoxy powder coating and preparation thereof
  • Extinction curing agent for epoxy powder coating and preparation thereof
  • Extinction curing agent for epoxy powder coating and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1 (ethylene glycol trimellitate is synthesized)

[0061] 192 grams of trimellitic anhydride (1.0 mol) and 34 grams of ethylene glycol (0.55 mol) were mixed, and nitrogen was evacuated. Heat up to 230-240°C under the continuous protection of nitrogen. During this period of time, water will continue to distill out. After the water (18 grams) close to the theoretical amount is distilled out, the temperature is raised to 260°C under a vacuum of 10-15mmHg and kept for 2 hours, then cooled. Refined with 900-1200 grams of acetone to obtain the intermediate trimellitic anhydride ethylene glycol ester, 176 grams of off-white powder, with a yield of 86%. The obtained intermediate was hydrolyzed with 5% aqueous sodium hydroxide solution, acidified with dilute hydrochloric acid to PH=1-3, filtered, and dried to obtain the final product ethylene trimellitate, 211.8 g of white powder, with a yield of 95%.

Embodiment 2

[0062] Embodiment 2 (curing agent of the present invention)

[0063] 446 grams of ethylene glycol trimellitate (1mol) obtained in Example 1 was dissolved in 1800 milliliters of dehydrated alcohol, heated to reflux, and basically completely dissolved, slowly added 146 grams of 2-phenylimidazoline (1mol), Insulate and react for 3 hours, concentrate to half of the original volume, cool to room temperature, the generated salt precipitates out, filter, and the mother liquor can be used mechanically. The filter cake was vacuum-dried at 80° C. to obtain 580 g of white powder with a yield of 98%.

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Abstract

The invention discloses an extinction curing agent for an epoxy powder coating and preparation thereof; the extinction curing agent is excellent in curing effect and has popularization value. The extinction curing agent is a salt of polycarboxylic acid represented by the formula 1 and imidazoline represented by the formula 2, wherein R1 represents C2-C10 straight or branched chain alkyl, C2-C10 branched or straight chain halogen mono-substituted or mulit-substituted alkyl, C2-C10 branched or straight chain aryl substituted alkyl, or O or S hetero atom-containing C2-C10 branched or straight chain alkyl, and R2 represents aryl, preferably phenyl, and C1-C10 branched or straight chain aryl substituted alkyl; the compound represented by the formula 2 is preferably 2-phenylimidazoline.

Description

technical field [0001] The invention relates to a salt formed of polycarboxylic acid and imidazoline amino compound, its application in epoxy powder coating, and its production method. Background technique [0002] As we all know, epoxy resin can be cured with various curing agents such as dicyandiamide, polybasic acid, hydrazide, boron trifluoride compound, substituted dicyandiamide, etc., but for some special requirements such as low gloss, matte, etc. When it is necessary to use a special curing agent or other methods to obtain. The industry generally adopts the following four methods: [0003] (1) Add inorganic fillers or polymer powders such as calcium carbonate, talcum powder or polytetrafluoroethylene powder to the powder system; [0004] (2) dry mixing powders with different reactivity; [0005] (3) modify the resin; [0006] (4) It is realized by using a special curing agent containing special functional groups of amine and carboxyl groups. [0007] Among the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/06C07C69/76C07C67/08C09D7/12C09D5/03C09D163/00
CPCC07D233/06C08K5/3445C09D5/033C09D7/63C09D163/00C08L67/00C08K2003/2241
Inventor 罗长青
Owner 罗长青