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Method for preparing cationic electrodeposition coating composition

A technology of cationic electrodeposition and composition, which is applied in electrophoretic coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor surface state and poor leveling of coating films, and achieve excellent paintability, Good effect of rust prevention and coating appearance

Pending Publication Date: 2021-12-24
นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by adding a thickener to the electrodeposition coating composition, the leveling property of the coating film may be deteriorated, and the surface condition of the flat portion other than the edge portion may be deteriorated.

Method used

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  • Method for preparing cationic electrodeposition coating composition
  • Method for preparing cationic electrodeposition coating composition

Examples

Experimental program
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Effect test

preparation example Construction

[0061] The preparation method of the cationic electrodeposition coating composition includes the step of preparing a pigment dispersion paste (ii), and the pigment dispersion paste (ii) comprises: bismuth compound (c1), metal oxide (c2), total carbon atoms A bismuth-metal oxide mixed solution (C) of a monohydroxycarboxylic acid (c3) with a number of 3 to 5 and a solvent; a pigment dispersion resin (D); a polybasic acid (E); and a pigment (F). And the above-mentioned preparation method is characterized in that the bismuth-metal oxide mixed solution (C) comprising the bismuth compound (c1) and the metal oxide (c2) is prepared through specific steps, thereby comprising the bismuth compound as a curing catalyst for cationic electrodeposition The coating composition provides good edge portion rust preventive properties, coating film appearance and paintability.

[0062] Resin emulsion (i)

[0063] The electrodeposition coating composition obtained by the above preparation method...

manufacture example 1

[0174] Production Example 1 Production of Pigment Dispersion Resin (D)

[0175] Preparation of 2-ethylhexanol half-blocked isophorone diisocyanate

[0176] In the reaction vessel equipped with stirring device, condensation pipe, nitrogen inlet pipe and thermometer, add 222.0 parts of isophorone diisocyanate (hereinafter referred to as IPDI), after diluting with 39.1 parts of methyl isobutyl ketone (MIBK), add to 0.2 part of dibutyltin dilaurate was added here. Thereafter, after raising the temperature to 50° C., 131.5 parts of 2-ethylhexanol were added dropwise under stirring in a dry nitrogen atmosphere over 2 hours to obtain 2-ethylhexanol semi-blocked IPDI (solid content 90.0% by mass).

[0177] Preparation of Modified Epoxy Resin and Pigment Dispersion Resin (D)

[0178] 351.6 parts and 99.2 parts of bisphenol A of Epon 828 (epoxy resin manufactured by Shell Chemical Co., Ltd., epoxy equivalent: 190) and 99.2 parts of bisphenol A were put into a reaction vessel ha...

manufacture example 2

[0180] Production Example 2 Production of Aminated Resin (A-1)

[0181] Add 92 parts of methyl isobutyl ketone, 940 parts of bisphenol A type epoxy resin (trade name: DER-331J, manufactured by Dow Chemical Co., Ltd.), 382 parts of bisphenol A, 63 parts of octanoic acid, 2 xylbenzylamine After keeping the temperature in the reaction container at 140° C. and reacting until the epoxy equivalent reached 1110 g / eq, it was cooled until the temperature in the reaction container reached 120° C. Next, a mixture of 78 parts of diethylenetriamine diketimine (73% solid content of methyl isobutyl ketone solution) and 92 parts of diethanolamine was added and reacted at 120°C for 1 hour to obtain aminated Resin (A-1) (cationically modified epoxy resin). The number-average molecular weight of this resin is 2,560, the amine value (milliequivalent of base relative to 100 g of resin solid content: MEQ (B)) is 50 mgKOH / g (among them, the amine value derived from primary amine is 14 mgKOH / g), a...

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Abstract

The purpose of the present invention is to provide a method which is for preparing a cationic electrodeposition coating composition containing a bismuth compound as a curing catalyst, and with which rust prevention for edge parts is improved. The method for preparing the cationic electrodeposition coating composition comprises a step for preparing a resin emulsion (i) containing an aminated resin (A) and a block isocyanate curing agent (B); a step for preparing a pigment dispersion paste (ii) including a bismuth / metal oxide mixture liquid (C) containing a bismuth compound (c1), a metal oxide (c2), a monohydroxy carboxylic acid having 3-5 total carbon atoms (c3), and a solvent, a pigment dispersion resin (D), a polyvalent acid (E), and a pigment (F); and a step for mixing the resin emulsion (i) and the pigment dispersion paste (ii) to prepare the cationic electrodeposition coating composition.

Description

technical field [0001] The invention relates to a preparation method of a cationic electrodeposition coating composition. Background technique [0002] Generally, a cationic electrodeposition coating composition includes a resin emulsion and a pigment dispersion paste. In such cationic electrodeposition coating compositions, organotin compounds are widely used as curing catalysts. However, organotin compounds are likely to have limited use in the future due to current environmental regulatory dynamics. Therefore, there is a need to develop alternative catalysts for organotin compounds. [0003] Research was conducted using bismuth compounds as curing catalysts for cationic electrodeposition coating compositions. However, simply dispersing a bismuth compound such as bismuth oxide or bismuth hydroxide in a pigment dispersion paste simply disperses the catalytic activity of the bismuth compound, and the coating film cannot be sufficiently cured. In addition, when a bismuth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/44C09D17/00C09D175/04C09D201/02C09D7/61C09D7/63C09D7/65
CPCC09D7/61C09D7/63C09D175/04C09D5/4438C09D5/4453C09D5/4457C09D17/007C09D7/45C08K5/09C08K3/22C09D175/12C08G18/227C08G18/643C08G18/8064C08G18/8077C08G18/8074C08G18/8025C08G18/73C08G18/7671C08G18/2825C08G18/2855C08G18/286C09D7/20C09D7/80C08K5/092C08K2003/221C09D5/4465C09D5/4496
Inventor 中岛沙理宫前治广金泽拓加纳裕久
Owner นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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