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Cation-modified epoxy resin, modified epoxy resin polymer, emulsion and production method thereof, paint and application

A technology of epoxy resin and polybutadiene epoxy resin, applied in the field of modified epoxy resin polymer, emulsion and its preparation, and cationic modified epoxy resin, can solve the problem of poor wetting and bonding ability of substrate, VOC Problems such as large emission and poor film stability of coating

Active Publication Date: 2019-06-07
GUANGDONG KODEST EP SC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing coatings have problems such as large VOC emissions, poor coating stability, large fluctuations in coating thickness, poor coating flexibility, and poor wetting and bonding capabilities to the substrate.
The known method of traditional cathodic electrophoretic coatings to improve the flexibility and leveling of the coating film is usually: the partial ring opening of the epoxy resin introduces alkylphenols or long-chain fatty acids or vegetable oils or long-chain polyetheramines; Chain extension with difunctional polyols or difunctional aliphatic amines; or adding plasticizers to cathodic electrophoretic coatings, such as ester alcohol twelve (CS-12), polypropylene glycol alkyl phenyl ether, etc.; the above methods There will be the following defects: sacrifice the performance of the cathodic electrophoretic coating film, especially the anti-corrosion performance

Method used

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  • Cation-modified epoxy resin, modified epoxy resin polymer, emulsion and production method thereof, paint and application
  • Cation-modified epoxy resin, modified epoxy resin polymer, emulsion and production method thereof, paint and application
  • Cation-modified epoxy resin, modified epoxy resin polymer, emulsion and production method thereof, paint and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Preparation of cationic modified epoxy resin:

[0065] In the reactor with agitator, reflux condensing tube, internal thermometer and nitrogen inlet, add the components comprising the following parts by weight respectively under a nitrogen atmosphere: epoxy equivalent weight is 600 parts of aliphatic type monofunctional epoxy resin of 180 and 200 parts of bisphenol A, stirred and mixed evenly, heated to 130°C, then added 0.6 parts of N,N-dimethylbenzylamine, kept at 140°C for 6 hours to obtain a polyepoxide with an epoxy equivalent of 500. Add 40 parts of N-methylethanolamine and 200 parts of ATBN, react at 120°C for 5 hours, then cool to below 60°C and discharge to obtain a cation-modified epoxy resin with an average molecular weight of 3000 for future use.

[0066] Preparation of isocyanate curing agent:

[0067] 30 parts of 4,4'-diphenylmethane diisocyanate, 30 parts of methyl isobutyl ketone (MIBK), 0.1 part of N,N dimethylbenzylamine, stir and mix evenly, heat to ...

Embodiment 2

[0078] Preparation of cationic modified epoxy resin:

[0079] Under a nitrogen environment, add the following components by weight into a reactor with a stirrer, a reflux condenser, an internal thermometer and a nitrogen inlet: 500 parts of bisphenol F and 500 parts of bisphenol S, stir and mix evenly and heat to 135 ℃, then add 0.3 parts of triethylamine, and keep warm at 145 ℃ for 4 hours to obtain a polyepoxide with an epoxy equivalent of 1000. Add 60 parts of diethylamine and 50 parts of ATBN, react at 120°C for 5 hours, then cool to below 60°C and discharge to obtain a cation-modified epoxy resin with an average molecular weight of 8,000 for future use.

[0080] Preparation of isocyanate curing agent:

[0081] 40 parts of toluene diisocyanate, 20 parts of methyl isobutyl ketone (MIBK), 0.5 parts of N,N dimethylbenzylamine, stir and mix evenly, heat to 70°C, add 20 parts of blocking agent imidazole dropwise to keep the temperature of the product At 60° C., after the drop...

Embodiment 3

[0091] Preparation of cationic modified epoxy resin:

[0092] In the reactor with stirrer, reflux condenser, internal thermometer and nitrogen inlet, add the components comprising the following parts by weight respectively under a nitrogen atmosphere: 900 parts of aliphatic bifunctional epoxy resins are heated to 132 ° C, and then added 0.2 parts of triethanolamine and 0.3 parts of triphenylphosphine were incubated at 143° C. for 5 hours to obtain a polyepoxide with an epoxy equivalent of 800. Add 20 parts of dibutylamine, 30 parts of diethanolamine, and 100 parts of ATBN, react at 125°C for 3 hours, then cool to below 60°C and discharge to obtain a cation-modified epoxy resin with an average molecular weight of 5000 for future use.

[0093] Preparation of isocyanate curing agent:

[0094] 35 parts of hexamethylene diisocyanate, 25 parts of methyl isobutyl ketone (MIBK), 0.3 parts of triethylamine, stir and mix evenly, heat to 90°C, add 20 parts of blocking agent alkyl alcoho...

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Abstract

The invention provides cation-modified epoxy resin, a modified epoxy resin polymer, emulsion and a production method thereof, paint and application. The cation-modified epoxy resin comprises an epoxyresin compound, an alkaline catalyst, an amine compound and a terminal amino butyronitrile copolymer. The modified epoxy resin polymer comprises the cation-modified epoxy resin, an isocyanate curing agent, an epoxy resin compound, an alkaline catalyst, acid and an amine compound. The emulsion comprises purified water, acid, cation-modified polybutadiene epoxy resin, the modified epoxy resin polymer and deionized water. According to the application of the paint, the paint is used for cathode electrophoretic painting. According to the cation-modified epoxy resin, the modified epoxy resin polymer, the emulsion and the production method thereof and the paint, the paint has the advantages that the water resistance is good, the VOC content is low, the leveling appearance is good, throwing poweris high, the sharp edge anti-corrosive property is high, adhesion between the paint and a base material is good, the anti-impact performance is good, and the like.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a cationic modified epoxy resin, a modified epoxy resin polymer, an emulsion, a preparation method thereof, a coating and an application thereof. Background technique [0002] Electrophoretic coatings have been developed with various special properties since they are widely used in the field of automobile body and auto parts. In particular, the electrophoretic coating method mainly based on cathodic electrophoretic coating has developed very rapidly since it was put into industrial production in the 1960s due to its excellent coating film performance, high coating utilization rate and low VOC content. Today, cathodic electrophoretic coatings are widely used in industries and fields such as automobile bodies, automobile and motorcycle parts, home appliances, furniture accessories, hardware, electromechanical, and military industries. [0003] Existing coatings have problems such as large ...

Claims

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Application Information

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IPC IPC(8): C08G59/14C08G18/58C09D163/00C09D175/04C09D5/44C08J3/03C08L63/00C08L75/04
Inventor 李文庄高睿梁卫南邓仲明
Owner GUANGDONG KODEST EP SC CO LTD
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