Modified waterborne polyester resin dispersion for waterborne stoving varnish and preparation method of dispersion

A technology of water-based polyester resin and polyester resin, which is applied in the field of modified water-based polyester resin dispersion for baking varnish and its preparation, which can solve the problems of poor storage stability, poor water resistance, unfavorable application and storage of baking varnish, and achieve stable storage Improved water resistance, excellent water resistance, and improved water resistance

Active Publication Date: 2019-06-14
广昌立骅科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing baking varnish produced by polymerization of polyester resin and amino resin has problems such as poor water resistance and poor storage stability, which is not conducive to the application and storage of baking varnish

Method used

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  • Modified waterborne polyester resin dispersion for waterborne stoving varnish and preparation method of dispersion
  • Modified waterborne polyester resin dispersion for waterborne stoving varnish and preparation method of dispersion
  • Modified waterborne polyester resin dispersion for waterborne stoving varnish and preparation method of dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 Modified aqueous polyester resin dispersion preparation embodiment

preparation example 1

[0026] Preparation of Modified Waterborne Polyester Resin Dispersion

[0027] 4 parts by weight of 2-methyl 1,3-propanediol, 24 parts by weight of neopentyl glycol, 7 parts by weight of trimethylolpropane, 16 parts by weight of adipic acid, 28 parts by weight of isophthalic acid , 10 parts by weight of polytetrahydrofuran ether glycol, 6 parts by weight of trimellitic anhydride, 16 parts by weight of ethylene glycol monobutyl ether, and dimethylethanolamine of 6 parts by weight are mixed, incubated at 140°C for 0.5 hours, and then heated up to 150 ℃ for 1 hour, continue to heat up to 180 ℃ for 2 to 3 hours, then raise the temperature to 220 ℃ for esterification reaction, until the reaction reaches an acid value of 20, stop the reaction; after the esterification reaction, add 110 parts by weight of Purified water, adjusted to solid content: 40-44%, VIS: 500-5000mpa.s (25°C), to obtain a modified water-based polyester resin dispersion.

[0028] Preparation of modified water-bas...

preparation example 2

[0031] Preparation of Modified Waterborne Polyester Resin Dispersion

[0032] 7 parts by weight of 2-methyl 1,3-propanediol, 29 parts by weight of neopentyl glycol, 11 parts by weight of trimethylolpropane, 20 parts by weight of adipic acid, 34 parts by weight of isophthalic acid , 20 parts by weight of polytetrahydrofuran ether glycol, 10 parts by weight of trimellitic anhydride, 26 parts by weight of ethylene glycol monobutyl ether, and 10 parts by weight of dimethylethanolamine are mixed at 140 ° C for 0.5 hours, and then heated to 160 Keep warm at 190°C for 1 hour, continue to heat up to 190°C for 2 to 3 hours, then raise the temperature to 230°C for esterification until the acid value is 30, stop the reaction; add 130 parts by weight after the esterification pure water, adjusted to solid content: 40-44%, VIS: 500-5000mPa.s (25°C), to obtain a modified water-based polyester resin dispersion.

[0033] Preparation of modified water-based baking varnish

[0034] Mix the obt...

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Abstract

The invention provides a modified waterborne polyester resin dispersion for stoving varnish and a preparation method of the modified waterborne polyester resin dispersion. Polytetrahydrofuran ether glycol is introduced into an alkyd resin chain, some special structures are introduced during modification, so that the waterborne polyester resin has properties which are not originally owned, and thenthe waterborne polyester resin is mixed with a waterborne polyurethane curing agent and baking is carried out at a high temperature, so that the waterborne stoving varnish with excellent water resistance and good storage performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of water-based polyester resin modification, and in particular relates to a modified water-based polyester resin dispersion for baking varnish and a preparation method thereof. Background technique [0002] In the past few years, with the high requirements of environmental protection, the coating industry and coating process are developing towards low pollution, and water-based coatings are increasingly emerging. Water-based coatings greatly reduce the harm and pollution of organic solvents to the environment, and also reduce the health hazards to operators. Water-based saturated polyester resin and water-based polyurethane curing agent can be formulated into water-based baking varnish, which is generally used for internal and external surface coating of metal workpieces. Compared with solvent-based baking varnish, water-based baking varnish has non-toxic , Non-polluting, non-flammable, non-explosive featur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C09D175/06
Inventor 张明乐王芳辉戴涛李小飞
Owner 广昌立骅科技股份有限公司
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