Preparation method for self-emulsified cationic epoxy emulsion

An epoxy emulsion and cationic technology, applied in epoxy resin coatings, coatings, electrophoretic coatings, etc., can solve the problems of difficult control of grafting reactions, low grafting efficiency, and affecting the performance of cathodic electrophoretic coatings, and achieve molecular weight distribution The effect of narrow range, excellent flexibility, and good coating performance

Inactive Publication Date: 2014-01-08
ZHAOQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the grafting reaction is difficult to control, the grafting efficiency is low, and the unreacted monomer in the final product will affect the performance of cathodic electrophoretic coating film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of chain extended epoxy resin:

[0025] Put 101.9g of bisphenol A type E-51 epoxy resin, 27.8g of bisphenol A, 21.9g of dodecylphenol, and 13g of polyoxyethylene ether (molecular weight 4000) in a four-way tank equipped with a thermometer, a condenser, and a stirring device. In the flask, heated to 115-120°C for miscibility. After the bisphenol A was completely dissolved, add 0.5g N,N dimethylbenzylamine, the reaction system exothermic obviously, control the system temperature at 150°C, react for 1.5 hours, quickly Cool, and add 20g propylene glycol monomethyl ether and 27.5g n-butanol to dissolve, and make chain-extended epoxy resin solution.

[0026] (2) Ring-opening amination of epoxy resin:

[0027] Add 10g of diethanolamine to the chain-extended epoxy resin solution, control the reaction temperature to 90-100°C, and the reaction time is 2-3 hours, then cool down to 60°C, and add 20g of sunmide3155 organic polyamine (produced by American Gas Chemica...

Embodiment 2

[0033] (1) Preparation of chain extended epoxy resin:

[0034] Place 100g of bisphenol A type E-51 epoxy resin, 23.6g of bisphenol A, 15.4g of dodecylphenol, 12.4g of polyoxyethylene ether, and 4g of xylene in a four-wheel tank equipped with a thermometer, a condenser, and a stirring device. In an open flask, heat up to 110-120°C to dissolve. When the bisphenol A is completely dissolved, add 0.4g N,N-diethyl-m-toluamide, the system exotherms obviously, control the final system temperature at 150-180°C, keep the reaction for 1-1.5 hours, quickly cool down to 120°C, add 30g Propylene glycol methyl ether and 31.8g n-butanol were dissolved to obtain a chain-extended epoxy resin solution.

[0035](2) Ring-opening amination of epoxy resin:

[0036] Add 11.4g of diethanolamine to the chain-extended epoxy resin solution, control the reaction temperature at 90-100°C, and after 2-3 hours of reaction, cool down to 60°C, add 3.4g of N,N-dimethylaminopropylamine, and react for 1 hour , ...

Embodiment 3

[0042] (1) Preparation of chain extended epoxy resin:

[0043] Put 128.8g of bisphenol A type E-51 epoxy resin, 30g of bisphenol A, 15g of dodecylphenol, and 12.7g of bisphenol A polyoxyethylene ether (molecular weight 4000) in a place equipped with a thermometer, a condenser, and a stirring device In a four-neck flask, heat up to 115-120°C for miscibility. After the bisphenol A is completely dissolved, add 0.5g of N,N-dimethylethanolamine catalyst, the reaction system exotherms and heats up, control the final system temperature at 150-180°C, keep it warm for 1-1.5 hours, then quickly cool down, add 4.1g of B Glycol butyl ether, 36g n-butanol, and 28g butanone were dissolved to obtain a chain-extended epoxy resin solution.

[0044] (2) Ring-opening amination of epoxy resin:

[0045] Add 17.2g of diethanolamine to the chain-extended epoxy resin solution, control the reaction temperature at 90-100°C, react for 2-3 hours, cool down to 60°C, add 20g of modified multi-component p...

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Abstract

The invention discloses a preparation method for self-emulsified cationic epoxy emulsion. The method mainly comprises: using bisphenol A, dodecylphenol and ethoxylatedbisphenol A to perform chain extension on low-molecular-weight epoxy resin to obtain medium-molecular-weight chain-extended epoxy resin; using diethanolamine and N, N-dimethylpropylamine to perform ring-opening amination on chain-extended epoxy resin; and taking a totally-enclosed modified MDI as a curing agent, neutralizing with lactic acid, and emulsifying in deionized water to obtain the self-emulsified cationic epoxy emulsion. According to the epoxy emulsion, tertiary / quaternary amine cationic epoxy resin is taken as the resin main body, and the molecules of the tertiary / quaternary amine cationic epoxy resin have both hydrophobic carbon chains and hydrophilic cationic chain segments, so that the resin molecules have self-emulsifying function, and can be stably emulsified in water without the help of emulsifiers. The provided self-emulsified cationic epoxy emulsion is applicable to preparation of cathodic electrophoretic coatings which has excellent coating performance.

Description

technical field [0001] The invention belongs to the preparation of an emulsion for water-based epoxy paint, in particular to the preparation of a self-emulsifying cationic epoxy emulsion suitable for cathodic electrophoretic paint. Background technique [0002] Cationic epoxy emulsion is the main film-forming substance of epoxy cathodic electrophoretic coatings. Its traditional synthesis process dissolves solid epoxy resin of medium molecular weight, reacts with hydrophilic organic amines, and then neutralizes and emulsifies it with organic acids. When hydrophilic amines are introduced into the epoxy resin molecules, the hydrogen bonds between the resin molecules are very strong, and the resin molecules are easy to coalesce and precipitate out, and cannot form stable latex particles that are hydrophilic on the outside and hydrophobic on the inside. A certain amount of emulsifier needs to be added. The added emulsifier will not only precipitate during the film-forming process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D163/02C09D7/12C09D5/44C09D175/04C08G59/62C08G59/14C08G18/80C08G18/58
Inventor 钟萍肖鑫钟银花
Owner ZHAOQING UNIV
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