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Method for forming electrodeposition coating

An electrodeposition, cation electrodeposition technology, applied in electrolytic coatings, electrophoretic coatings, coatings, etc., can solve the problems of pores, arc craters, bad appearance, etc., and achieve the effect of reducing the generation of pores and excellent appearance.

Inactive Publication Date: 2008-11-12
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when a galvanized steel sheet is used as an object to be coated, problems of pores and craters are more likely to occur on the obtained electrodeposited coating film, and a bad appearance is more likely to occur

Method used

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  • Method for forming electrodeposition coating

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Experimental program
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preparation example Construction

[0076] 【051】 Preparation of Electrodeposition Coating Composition

[0077] The electrodeposition coating composition in the present invention can be prepared by dispersing a binder resin emulsion, a pigment dispersion slurry, and optionally a catalyst in an aqueous medium. The binder resin emulsion includes an amine-modified epoxy resin (1) and a blocked isocyanate curing agent (2).

[0078] [052] The binder resin emulsion can be prepared by a conventional method. A preferred method of preparation involves mixing an amine-modified epoxy resin (1), a blocked isocyanate curing agent (2) and an aqueous medium containing a neutralizing acid to emulsify the binder resin. The neutralizing acid is an acid that neutralizes the amine-modified epoxy resin and improves the dispersibility of the binder resin emulsion. Neutralizing acids are inorganic or organic acids, such as hydrochloric acid, nitric acid, phosphoric acid, formic acid, acetic acid or lactic acid.

[0079] [053] When...

preparation Embodiment 1

[0096] Preparation of amine-modified epoxy resin (i)

[0097] In a flask equipped with a stirrer, cooling tube, nitrogen introduction tube, thermometer and dropping funnel, add 940 parts of liquid epoxy resin, 61.4 parts of methyl isobutyl ketone (here, abbreviated as MIBK) and 24.4 parts parts of methanol. After the temperature of the reaction mixture was raised from room temperature to 40° C., 0.01 parts of dibutyltin laurate and 21.75 parts of toluene diisocyanate (here, abbreviated as TDI) were added. The mixture was reacted at 40 to 45°C for 30 minutes. The reaction was continued until the absorption peak based on the isocyanate group disappeared.

[0098] [068] 82.0 parts of bisphenol A polyoxyethylene ether and 125.0 parts of diphenylmethane-4,4'-diisocyanate were added to the above reaction product. The reaction is carried out at 55°C to 60°C and the reaction is continued until the absorption peak based on the isocyanate group disappears in IR spectrum detection. ...

preparation Embodiment 2

[0101] Preparation of blocked polyisocyanate curing agent (A)

[0102] Add 1330 parts of crude MDI, 276.1 parts of MIBK and 2 parts of dibutyltin laurate to the reaction vessel, heat the mixture until 85 to 95°C, and then add 1170 parts of caprolactam in ethylene glycol mono Butyl ether solution (equivalent ratio of 20 / 80). After the dropwise addition was complete, the mixture was warmed to 100°C and maintained at this temperature for 1 hour. After confirming that the absorption peak based on the isocyanate group disappeared in IR spectrum detection, 347.6 parts of MIBK were added to obtain a blocked polyisocyanate curing agent.

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Abstract

The present invention is intended to provide a process for forming an electrodeposition coating film, wherein generation of gas pinhole is reduced and coating film appearance is excellent without using a specific resin as a binder resin. The present invention relates a process for forming an electrodeposition coating film having reduction of generation of gas pinhole, comprising a step of electrocoating by immersing an article to be coated in a cationic electrodeposition coating composition, wherein, the cationic electrodeposition coating composition comprises 10 to 30 parts by weight of a pigment comprising zinc oxide based on 100 parts by weight of a solid content of the coating composition, and the content of zinc oxide contained in the pigment is 0.25 to 5 parts by weight based on 100 parts by weight of the pigment.

Description

technical field [0001] [001] The present invention relates to a method of forming an electrodeposition coating film in which the generation of gas pinholes is reduced and the appearance of the coating film is excellent, and also to a method of improving storage stability of a pigment dispersion slurry. Background technique [0002] [002] Since the cationic electrodeposition coating can realize the coating of fine details even when the coated article has a complex shape, and can be automatically and continuously coated, this method is widely used in practice as a method with large coatings. A method for priming objects with large coverage and complex shapes, such as, in particular, automobile bodies. Cationic electrodeposition coating is carried out by immersing the article to be coated as an anode in the cationic electrodeposition coating composition and applying a voltage thereto. [0003] [003] In the cationic electrodeposition coating process, the deposition of the coati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/06C09D5/44C09D163/00C09D7/12C09D175/04
CPCC25D15/02C09D5/4492
Inventor 筒井启介吉泽谦一须田晃一泉宫耕二
Owner NIPPON PAINT CO LTD
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