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Emulsion resin for high-humidity film resistance cathodic electrophoretic coating and preparation method thereof

A cathodic electrophoretic coating, membrane resistance technology, applied in electrophoretic coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve problems such as use surface limitations

Active Publication Date: 2017-01-04
HAOLISEN COATING SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional epoxy cathodic electrophoretic coating emulsions are generally made of epoxy-modified polyamine resin or amine-modified epoxy resin mixed with fully-enclosed polyisocyanate. After being neutralized by organic acid to form a salt, add deionized Emulsified with water, this type of electrophoretic coating generally has better coating performance and excellent corrosion resistance effect, but its use surface is limited for occasions that require high throwing power

Method used

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  • Emulsion resin for high-humidity film resistance cathodic electrophoretic coating and preparation method thereof
  • Emulsion resin for high-humidity film resistance cathodic electrophoretic coating and preparation method thereof
  • Emulsion resin for high-humidity film resistance cathodic electrophoretic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of bisphenol A type epoxy resin:

[0035] First add inert organic solvent, bisphenol A and organic base to the basic epoxy resin, heat up to 100-150°C under constant stirring, keep warm for 1-2 hours, cool down and discharge, the basic epoxy resin is catalyzed by the organic base and Bisphenol A undergoes a chain extension reaction to obtain an epoxy resin with an epoxy equivalent of 300-2000, and put it in a clean and sealed container for later use. The organic base catalyst can be triethylamine, N-N dimethylbenzylamine, triethanolamine , Dimethylethanolamine, triphenylphosphine, methyldiethanolamine. The reaction formula is as follows:

[0036]

[0037] The specific formula is as follows:

[0038] Substance name Parts (parts by mass) 128 resin 690 Bisphenol A 210

[0039] Triethylamine 1 Xylene 110

[0040] In a four-neck flask equipped with a thermometer, a stirring paddle, and a condenser tube, add 1...

Embodiment 2

[0042] The epoxy resin containing quinoline structure prepared by bisphenol A type epoxy resin and 8-hydroxyquinoline:

[0043] Add bisphenol A type epoxy resin into an inert organic solvent, raise the temperature to 115-125°C under constant stirring, add 8-hydroxyquinoline, raise the temperature to 120-130°C after the addition, keep it warm for 3 hours, then cool down and discharge the material to obtain expanded 8-hydroxyquinoline modified bisphenol A epoxy resin after the chain.

[0044] The inert organic solvent can be an alcohol solvent, an alcohol ether solvent, a toluene solvent or a ketone solvent, wherein the alcohol solvent can be selected from isopropanol, n-butanol, isobutanol, n-hexanol, isooctyl alcohol, etc. Alcohol ether solvents can choose ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol butyl ether, ethylene glycol hexyl ether, diethylene glycol butyl ether, propylene glycol methyl ether, toluene solvents can choose toluene, ...

Embodiment 3

[0050] Amine modification of epoxy resin containing quinoline structure:

[0051]Add the epoxy resin containing quinoline structure to an inert organic solvent, raise the temperature to 75-85°C under constant stirring, add the amine-modified compound containing active hydrogen, raise the temperature to 100-120°C after adding, keep it warm for 3 hours and then cool down Discharging, to obtain functional modified epoxy resin A, put into a clean and sealed container for subsequent use, the amount of the amine-modified compound containing active hydrogen accounts for 70% of the total amount of epoxy groups according to active hydrogen- 80%, the selected monovalent secondary amines can be alkylamines, ketimines, alcoholamines, etc. or their mixtures, wherein the alkylamines can be diethylamine, methylisobutylamine, dibutylamine Base amines, ketimines can choose hydroxymethyl ethylenediamine ketimines, diethylenetriamine ketimines, alcohol amines can choose diethanolamine, methyleth...

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Abstract

The present invention relates to a kind of emulsion resin for cathodic electrophoretic paint of high humidity film resistance, it is characterized in that mainly comprising following component: i). Functional modified epoxy resin A, by bisphenol A type epoxy resin and 8-hydroxyquinone The epoxy resin containing the quinoline structure prepared by morphine is obtained by amine modification, ii). Functional modified epoxy resin B, the ring containing oxazolidinone ring prepared from basic epoxy resin and toluene diisocyanate Oxygen resin is obtained by amine modification after bisphenol A chain extension. The present invention introduces the functional resin containing the oxazolidinone structure into the electrophoretic coating, and the throwing power measured by the Ford cell method is greater than 21 cm.

Description

[0001] [technical field] [0002] The invention relates to the technical field of cathodic electrophoretic coatings, in particular to a method for preparing a cathodic electrophoretic coating emulsion with high throwing power by increasing the wet film resistance after electrophoretic film formation. [0003] [Background technique] [0004] Since the 1970s, cathodic electrophoretic coatings have been used in industrial applications because of their excellent corrosion resistance, excellent mechanical properties and high automation in coating applications. Make it widely used and popularized in the automobile industry rapidly. However, in the current electrophoretic coating, there is a difficulty that has not been completely overcome, that is, the electrophoretic coating's throwing power. Because the workpiece to be coated has various complex shapes, it contains various grooves, gaps and cavities. During the electrophoresis process, these complex shapes often have uneven coati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D175/04C09D5/44C08G59/14C08G18/80C08G18/58
Inventor 柳昀刘薇薇周贤赵颖陈豪杰付志虎高文举
Owner HAOLISEN COATING SHANGHAI
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