Dry mixing extinction type powder coating material with good low-temperature curing property, and preparation method thereof

A technology of matting powder coatings and powder coatings, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as poor dispersion, meet the requirements of industrial scale production, reduce consumption and waste, and broaden the application field Effect

Active Publication Date: 2016-12-21
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

Specifically, it is to add hydroxyl-terminated perfluoropolyether to the high acid value polyester resin during the preparation process to further improve the physical properties of the coating, and at the same time to overcome the poor dispersion of hydroxyl-terminated perfluoropolyether in the reaction system To solve the problem, add phosphate derivatives to make cross-combination between hydroxyl-terminated perfluoropolyeth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]The preparation method of the modified high-acid polyester resin comprises the following steps: the preparation method comprises the following steps: adding all the hydroxyl-terminated perfluoropolyether, polyhydric alcohol, polyacid, esterification catalyst and phosphoric acid ester derivatives into the reaction kettle, Under the protection of nitrogen, the temperature is gradually raised to 180-220°C for dehydration and esterification, and then the temperature is raised to 240-260°C to continue the dehydration and esterification. When the pH of the reactants dropped below 9, the reaction was continued under reduced pressure and low boilers were removed. When the temperature of the reactant drops to 180-190° C., add an end-capping agent and react for 1-1.5 hours to prepare the high-acid polyester resin. The molar ratio of hydroxyl-terminated perfluoropolyether to polyol is 1-2:1.

[0030] The preparation method of the modified low-acid polyester resin comprises the fol...

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PUM

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Abstract

The present invention relates to a two-component polyester resin for a low-temperature curing dry-mixing extinction powder coating material, and a power composition thereof. According to the present invention, mainly the high acid value component of the dry-mixing extinction polyester resin increases the types and the amounts of triols having high grafting degree; the final acid value of the polyester resin is increased to 65-75 mg KOH/g so as to improve the activity; the low acid value component of the dry-mixing extinction polyester resin mainly selects a lot of flexible raw materials to adjust the melting viscosity of the polyester while high-activity polybasic acid such as maleopimaric acid and benzenetetracarboxylic acid are introduced to perform the end capping so as to increase the acid value to 28-35 mg KOH/g, such that the low-temperature curing performance is ensured; and the dry mixing powder coating material prepared from the high-low acid value component polyester resin can be cured at the low temperature of 140-160 DEG C, and can achieve the extinction effect of the gloss of 20-40%.

Description

technical field [0001] The invention belongs to the field of powder coating preparation; in particular, it is a dry mixed matting type two-component polyester resin powder coating composition with good low-temperature curing performance and a preparation method thereof. Background technique [0002] Since its appearance in the 1970s, powder coatings do not contain organic solvents and are 100% solid components. Compared with conventional coatings, powder coatings have the advantages of no pollution, saving energy and resources, high mechanical strength of coating films, and full recovery of excess coatings. Advantages, it is more and more widely used in the coating of household appliances, automobile industry, office appliances, metal materials, outdoor buildings and other shells. [0003] As customers have higher and higher requirements for powder coatings, matte powder coatings are widely used in the industry as a variety with better decoration. At present, in the field o...

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D5/03C08G63/682C08G63/695
CPCC08G63/6824C08G63/6954C08L2205/025C09D5/03C09D167/00C08L67/00
Inventor 郑荣辉鲍观良王永垒孙成强
Owner 黄山市向荣新材料有限公司
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