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Method for forming electrodeposited coating

A technology of electrodeposition and cationic electrodeposition, which is applied in the direction of coating, electrolytic coating, electrolytic inorganic material coating, etc., can solve the problem that the coating cannot be smoothed by electrodeposition

Inactive Publication Date: 2007-09-19
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the uncured electrodeposited coating cannot be made smoother by using methods to control the tackiness characteristics of the curing stage

Method used

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  • Method for forming electrodeposited coating

Examples

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preparation example Construction

[0046] Preparation of Cationic Electrodeposition Coating Composition

[0047] The cationic electrodeposition coating composition of the present invention can be prepared by dispersing the above-mentioned cationic epoxy resin, blocked isocyanate curing agent, and if necessary, pigment dispersion slurry and catalyst in an aqueous medium. Typically, the aqueous medium contains a neutralizing acid to neutralize the cationic epoxy resin to improve dispersibility. Examples of neutralizing acids include inorganic acids and organic acids such as hydrochloric acid, nitric acid, phosphoric acid, formic acid, acetic acid, lactic acid, sulfamic acid and N-acetylglycine. The aqueous medium in this specification is water or a mixture of water and an organic solvent. Ion-exchanged water is preferably used as water. Examples of usable organic compounds include: hydrocarbons such as xylene and toluene; alcohols such as methanol, n-butanol, isopropanol, 2-ethylhexanol, ethylene glycol, and pr...

preparation Embodiment 1-1

[0067] Preparation Example 1-1 Preparation of Blocked Isocyanate Curing Agent

[0068] Weigh 199 parts of trimer of hexamethylene diisocyanate (manufactured by Nihon Polyurethane Industry Co., Ltd., trade name COLONATE HX), 32 parts of methyl isobutyl ketone (MIBK) and 0.03 part of dibutyl dilaurate Tin into a flask equipped with a stirrer, cooler, nitrogen injection tube, thermometer and dropping funnel, add 87.0 parts of methyl ethyl ketone oxime dropwise from the dropping funnel to the mixture within 1 hour while stirring and blowing with nitrogen bubbly. The temperature was raised from 50°C to 70°C. After that, the reaction was continued for 1 hour until the absorption of the NCO group in the infrared spectrometer disappeared. After that, 0.74 parts of n-butanol and 39.93 parts of MIBK were added to adjust the non-volatile content to 80%.

preparation Embodiment 1-2

[0069] Preparation Example 1-2 Preparation of Blocked Isocyanate Curing Agent

[0070] Weigh 125 parts of diphenylmethane diisocyanate and 26.6 parts of MIBK into a flask equipped with a stirrer, cooler, nitrogen injection tube, thermometer and dropping funnel, and after heating the mixture to 80 °C, add 0.25 parts of dilauric acid diisocyanate Ding Xi. A solution obtained by dissolving 22.6 parts of ε-caprolactam in 94.4 parts of butyl cellosolve was dropped into the mixture from the dropping funnel over 2 hours at 80°C. After the mixture was further heated at 100° C. for 4 hours, the reaction was continued until the absorption of the NCO group disappeared in the infrared spectrometer. After standing and cooling, 33.6 parts of MIBK were added to adjust the non-volatile content to 80%.

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Abstract

To provide a method for forming an electrodeposited coating excellent in finish-appearance and capable of a higher film resistance value. A method for forming an electrodeposited coating including a step of electrodeosition-coating a cationic electrodeposition coating composition on an object to be coated, wherein a film viscosity of an electrodeposited coating obtained from the cationic electrodeposition coating composition is in the range of 3000 to 5000 Pa.s at 50 DEG C.

Description

technical field [0001] The present invention relates to a method of forming an electrodeposited coating having a good finish appearance. Background technique [0002] Cationic electrodeposition coating is a coating method in which an object to be coated is dipped in a cationic electrodeposition coating composition as a cathode and a voltage is applied thereto. Since this method can not only coat the subtleties of the object to be coated, even if it has a complex shape, but also automatically and continuously coat it, this method has been used in many applications as an object with a large size and a complex shape. Undercoating application methods for coated objects, especially automobile bodies, are put into practice. [0003] In the process of cationic electrodeposition coating, the coating is deposited by electrochemical reaction, and the coating is deposited by applying voltage on the surface of the coated object. Due to the insulating properties of the deposited coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/06
CPCC08G18/58C08G18/4879C08G18/3256C08G18/8074C09D5/4438C25D9/08C08G18/8077C08G18/8064C08G18/792C08G18/643C08G18/003E04H17/24
Inventor 东井辉三児岛与志夫
Owner NIPPON PAINT CO LTD
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