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Emulsion resin for high-humidity film resistor cathode electrophoresis paint and preparing method of emulsion resin

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: 2014-11-12
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 resistor cathode electrophoresis paint and preparing method of emulsion resin
  • Emulsion resin for high-humidity film resistor cathode electrophoresis paint and preparing method of emulsion resin
  • Emulsion resin for high-humidity film resistor cathode electrophoresis paint and preparing method of emulsion resin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of bisphenol A epoxy resin:

[0031] First add an inert organic solvent, bisphenol A and an organic base to the base epoxy resin, heat it up to 100-150°C under constant stirring, keep it for 1-2 hours, cool down and discharge, and the base epoxy resin is catalyzed by an organic base to react with Carry out chain extension reaction of bisphenol A, that is, epoxy resin with epoxy equivalent of 300-2000 is prepared, which is put into a clean and sealed container for standby use. The organic base catalyst can be selected from triethylamine, N-N dimethylbenzylamine, triethanolamine , dimethylethanolamine, triphenylphosphine, methyldiethanolamine. The reaction formula is as follows:

[0032]

[0033] The specific formula is as follows:

[0034] substance name Parts (mass parts) 128 resin 690 Bisphenol A 210

[0035] triethylamine 1 Xylene 110

[0036] In a four-necked flask equipped with a thermometer, a stirr...

Embodiment 2

[0038] Epoxy resin containing quinoline structure prepared from bisphenol A epoxy resin and 8-hydroxyquinoline:

[0039] The bisphenol A epoxy resin is added to an inert organic solvent, the temperature is raised to 115-125 ° C under constant stirring, 8-hydroxyquinoline is added, the temperature is raised to 120-130 ° C after the addition is completed, and the temperature is lowered for 3 hours. 8-hydroxyquinoline-modified bisphenol-a epoxy resin after chain.

[0040] 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, isooctanol, 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, O-xylene, m-xylene; ketone...

Embodiment 3

[0046] Amine modification of epoxy resin containing quinoline structure:

[0047]Add the epoxy resin containing quinoline structure to an inert organic solvent, heat up to 75-85°C under constant stirring, add an amine modified compound containing active hydrogen, heat up to 100-120°C after adding, keep warm for 3 hours, and then cool down Discharge, to obtain functional modified epoxy resin A, put it into a clean and sealed container for standby use, the amount of the active hydrogen-containing amine modified compound accounts for 70% of the total epoxy group calculated by active hydrogen- 80%, the selected monobasic secondary amines can be alkylamines, ketimines, alcoholamines, etc. or their mixtures, wherein the alkylamines can be selected from diethylamine, methyl isobutylamine, dibutylamine Base amines, ketimines can be selected from methylol ethylenediamine ketimines, diethylene triamine ketimines, alcohol amines can be selected from diethanolamine, methyl ethanolamine; a...

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Abstract

The invention relates to emulsion resin for high-humidity film resistor cathode electrophoresis paint. The emulsion resin is characterized by mainly comprising the following components of (i) functional modified epoxy resin A and (ii) functional modified epoxy resin B, wherein the functional modified epoxy resin A is obtained by amine modification of epoxy resin prepared by bisphenol A epoxy resin and 8-hydroxyquinoline and containing a quinoline structure, bisphenol A chain extension and amine modification are conducted on epoxy resin which is prepared by basic epoxy resin and toluene diisocyanate and contains oxazolidinone rings, and therefore the functional modified epoxy resin B is obtained. According to the emulsion resin and a preparing method of the emulsion resin, the functional resin containing an oxazolidinone structure is introduced to the electrophoresis paint and throwing power, measured through a Ford box method, of the emulsion resin is larger than 21 cm.

Description

[technical field] [0001] 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. [Background technique] [0002] 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 coating films inside...

Claims

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Application Information

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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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