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Water-based hydroxyl-containing polyester dispersion for automobile paint and preparation method thereof

A technology of hydroxyl polyester and hydroxyl polyacrylate, which is applied in the field of aqueous hydroxyl-containing polyester dispersion and its preparation, and can solve the problems of poor storage stability of resins and coatings, poor stability of trimellitic anhydride, etc.

Active Publication Date: 2020-10-20
上海金力泰化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, trimellitic anhydride or dimethylolpropionic acid (DMPA) is introduced into the molecule. However, because of the poor stability of trimellitic anhydride, there is a certain risk of decarboxylation, and the storage stability of resins and coatings is poor.

Method used

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  • Water-based hydroxyl-containing polyester dispersion for automobile paint and preparation method thereof
  • Water-based hydroxyl-containing polyester dispersion for automobile paint and preparation method thereof
  • Water-based hydroxyl-containing polyester dispersion for automobile paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 73.3 parts of isophthalic acid, 158.6 parts of hexahydrophthalic anhydride, 173.7 parts of hexanediol, 49.3 parts of trimethylolpropane, 0.12 parts of monobutyltin oxide and a small amount of xylene into the reaction kettle for reflux, and heat up to 150°C Keep warm for 30 minutes, gradually increase the temperature to 200-220°C for 5 hours, check the acid value ≤ 3mgKOH / g, remove the reflux solvent xylene by vacuuming, and check the solid content ≥ 98%.

[0033] Then cool down to 160°C, add 24.1 parts of trimellitic anhydride, keep warm for 2 hours, check the acid value ≤ 35mgKOH / g, cool to 120°C, add 25 parts of dipropylene glycol methyl ether, and add neutralizer N, N- when the temperature is lower than 95°C 20 parts of dimethylethanolamine, keep warm for 30 minutes, add 500 parts of deionized water dropwise, heat up to 80°C and heat for 2 hours to mature, cool down to below 40°C and then filter out the material to obtain the solid content of 46%, the number avera...

Embodiment 2

[0036] Add 62.9 parts of isophthalic acid, 175.2 parts of hexahydrophthalic anhydride, 193.4 parts of hexanediol, 24.4 parts of trimethylolpropane, 0.12 parts of monobutyltin oxide and a small amount of xylene into the reaction kettle for reflux, and heat up to 150°C Keep warm for 30 minutes, gradually increase the temperature to 200-220°C for 5 hours, check the acid value ≤ 3mgKOH / g, remove the reflux solvent xylene by vacuuming, and check the solid content ≥ 98%. Then cool down to 160°C, add 24.1 parts of trimellitic anhydride, keep warm for 2 hours, check the acid value ≤ 35mgKOH / g, cool to 120°C, add 25 parts of dipropylene glycol methyl ether, and add neutralizer N, N- when the temperature is lower than 95°C 17.9 parts of dimethylethanolamine, keep warm for 30 minutes, add 500 parts of deionized water dropwise, heat up to 80°C and keep it for 2h to mature, cool down to below 40°C and then filter out the material to obtain the solid content of 46%, the number average molecu...

Embodiment 3

[0039]Add 131.2 parts of isophthalic acid, 115.4 parts of adipic acid, 197.3 parts of neopentyl glycol, 0.12 parts of monobutyltin oxide and a small amount of xylene into the reaction kettle for reflux, raise the temperature to 150 ° C for 30 minutes, and gradually heat up for 5 hours To 200-220°C, the acid value is detected to be ≤3mgKOH / g, the reflux solvent xylene is removed by vacuuming, and the solid content is detected to be ≥98%. Then cool down to 160°C, add 24.0 parts of trimellitic anhydride, keep warm for 2 hours, check the acid value ≤ 35mgKOH / g, cool to 120°C, add 25 parts of dipropylene glycol methyl ether, and add neutralizer N, N- when the temperature is lower than 95°C 16.7 parts of dimethylethanolamine, keep warm for 30min, add 460 parts of deionized water dropwise, heat up to 80°C and keep it warm for 2h to mature, cool down to below 40°C and then filter out the material to obtain the solid content of 46%, the number average molecular weight of about 2000, Hy...

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Abstract

The invention discloses water-based hydroxyl-containing polyester dispersion resin for top coating in automobile paint, which is characterized by being prepared from the following six parts: 1 to 10 parts of a solvent, 10 to 40 parts of active polybasic carboxylic acid monomer, 10 to 40 parts of an active polybasic hydroxyl monomer, 1 to 10 parts of trimellitic anhydride, 0.5 to 10 parts of a neutralizer and 30 to 60 parts of deionized water. The invention also discloses a preparation method of the water-based hydroxyl-containing polyester dispersion resin. The preparation method comprises thefollowing steps: reacting polycarboxylic acid with polyol to synthesize polyester resin with hydroxyl, adding trimellitic anhydride to provide hydrophilicity, adding a neutralizer to neutralize, andemulsifying and dispersing with water to obtain the water-based hydroxyl-containing polyester dispersion resin. The water-based hydroxyl-containing polyester dispersion provided by the invention is good in resin stability, low in organic solvent content and very suitable for matrix resin of water-based automobile paint, and the prepared water-based automobile paint is good in appearance and excellent in storage stability.

Description

technical field [0001] The invention belongs to the technical field of water-based coatings, and in particular relates to a water-based hydroxyl-containing polyester dispersion for automobile paints and a preparation method thereof. Background technique [0002] With the world's emphasis on VOC emissions, governments of various countries have successively introduced many relevant laws to restrict the production and use of high-VOC coating products, and water-based coatings have become the main trend of coating development. Waterborne polyester resin coatings are currently one of the main hot spots in the development of waterborne coatings because of their high gloss, high impact resistance, good weather resistance, solvent resistance and aging resistance. [0003] Water-based polyester can be divided into water-soluble polyester resin and water-dispersible polyester resin. Water-soluble polyester resins have high acid value, low molecular weight, high organic solvent conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/137C08G63/127C08G63/20C09D167/00C09D167/02
CPCC08G63/137C08G63/127C08G63/20C09D167/00C09D167/02
Inventor 苏成虎马宝海吴纯超
Owner 上海金力泰化工股份有限公司
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