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Method for preparing cationic electrodeposition coating composition

A cationic electrodeposition and composition technology, which is applied in electrophoretic coatings, electrolytic coatings, epoxy resin coatings, etc., can solve the problems of inability to cure the coating film, deterioration of the appearance of the coating film, and deterioration of storage stability, and achieve easy preparation and coating. The effect of excellent film appearance and excellent stability

Active Publication Date: 2018-04-27
นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only by simply dispersing a bismuth compound such as bismuth oxide or bismuth hydroxide in a pigment dispersion slurry, the catalyst activity of the bismuth compound is insufficient, and thus the resulting coating film cannot be sufficiently cured
This also poses a problem that the addition of the bismuth compound to the cationic electrodeposition coating composition deteriorates the storage stability of the coating composition or pigment dispersion slurry, causing aggregation during storage
The use of a large amount of acid for dissolving bismuth also causes problems in that the electrical conductivity of the electrodeposition coating composition becomes high, deteriorating the workability of electrodeposition coating, and deteriorating the appearance of the obtained coating film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] Preparation of Cationic Electrodeposition Coating Composition

[0050]The method for preparing the cationic electrodeposition coating composition of the present invention includes the step of mixing the resin emulsion (i) and the pigment dispersion slurry. The aforementioned resin emulsion (i) contains an aminated resin (A) and a blocked isocyanate curing agent (B). The above-mentioned pigment dispersion paste comprises: a bismuth mixture (C) obtained by mixing a bismuth compound (c1) and an organic acid (c2) in advance, a pigment dispersion resin (D), an amine-containing amine-modified epoxy resin (E) Modified epoxy resin emulsion (ii), and pigment (F).

[0051] Resin emulsion (i)

[0052] The aforementioned resin emulsion (i) contains an aminated resin (A) and a blocked isocyanate curing agent (B). The resin emulsion (i) may further contain other components as necessary.

[0053] Aminated resin (A)

[0054] The aminated resin (A) is a coating film forming r...

preparation example 1

[0161] Preparation Example 1 Preparation of Pigment Dispersion Resin (D)

[0162] Preparation of 2-ethylhexanol semi-blocked isophorone diisocyanate

[0163] 222.0 parts of isophorone diisocyanate (hereinafter abbreviated as IPDI) were charged into a reaction vessel equipped with a stirrer, cooling pipe, nitrogen introduction pipe and thermometer, and then 39.1 parts of methyl isobutyl ketone (hereinafter abbreviated as MIBK) This was diluted, and then 0.2 parts of dibutyltin dilaurate was added to the mixture. Afterwards, the mixture was heated to 50° C., and 131.5 parts of 2-ethylhexanol were added dropwise to the mixture under stirring under a dry nitrogen atmosphere for 2 hours to obtain 2-ethylhexanol semi-blocked IPDI (solid content : 90.0% by mass);

[0164] Preparation of quaternizing reagents

[0165] 87.2 parts of dimethylethanolamine, 117.6 parts of 75% lactic acid aqueous solution and 39.2 parts of ethylene glycol mono-n-butyl ether were sequentially added...

preparation example 2-1

[0168] Preparation Example 2-1 Preparation of Aminated Resin (A-1)

[0169] Add 92 parts of methyl isobutyl ketone, 940 parts of bisphenol A type epoxy resin (trade name: DER-331J, manufactured by Dow Chemical Company), 382 parts of bisphenol A, 63 parts of octanoic acid and 2 parts Dimethylbenzylamine, the reaction vessel was kept at 140°C, and the mixture was reacted until the epoxy equivalent increased to 1110 g / eq, and then the mixture was cooled until the temperature in the reaction vessel was cooled to 120°C. Then, a mixture of 78 parts of diethylenetriamine diketimine (a solution of methyl isobutyl ketone with a solid content of 73%) and 92 parts of diethanolamine was added to the reaction mixture, and reacted at 120°C for 1 hour to obtain amine Chemical resin (cationically modified epoxy resin). The resin had a number average molecular weight of 2,560 and an amine value (milliequivalent of base per 100 g of resin solids content (MEQ(B)) of 50 mg KOH / g (where the ami...

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Abstract

The objective of the present invention is to provide a method for preparing a cationic electrodeposition coating composition that contains a bismuth compound and exhibits excellent coating material stability, curability, coating film appearance and the like. The present invention provides a method for preparing a cationic electrodeposition coating composition, which comprises a step for mixing a resin emulsion (i) and a pigment-dispersed paste, and wherein: the resin emulsion (i) contains an aminated resin (A) and a blocked isocyanate curing agent (B); the pigment-dispersed paste contains a bismuth mixture (C) that is obtained by mixing a bismuth compound (c1) and an organic acid (c2) in advance, a pigment-dispersed resin (D), an amine-modified epoxy resin emulsion (ii) that contains an amine-modified epoxy resin (E), and a pigment (F); the pigment-dispersed resin (D) has a hydroxyl number of 20-120 mgKOH / g; and the amine-modified epoxy resin (E) has a hydroxyl number of 150-650 mgKOH / g.

Description

technical field [0001] The present invention relates to a process for preparing cationic electrodeposition coating compositions. Background technique [0002] A cationic electrodeposition coating composition generally contains a resin emulsion and a pigment dispersion slurry. In such cationic electrodeposition coating compositions, organotin compounds have hitherto been widely used as curing catalysts. However, perhaps the use of organotin compounds is limited due to environmental regulatory tendencies. Therefore, there is a need to develop catalysts as alternatives to organotin compounds. [0003] Research was conducted using bismuth compounds as curing catalysts for cationic electrodeposition coating compositions. However, only by simply dispersing a bismuth compound such as bismuth oxide or bismuth hydroxide in the pigment dispersion slurry, the catalytic activity of the bismuth compound is insufficient, and thus the resulting coating film cannot be sufficiently cured....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/44C09D7/61C09D7/63C09D175/04C25D13/06
CPCC09D175/04C25D13/22C08G59/1477C08G59/184C08G18/73C08G18/7664C08G18/8025C08G18/8032C08L75/04C09D17/004C09D17/001C09D17/008C09D5/4492C09D17/005C08K3/346C08K3/22C08K5/09C09D7/61C09D7/63C09D7/80C08K5/42C08K5/098C09D5/4465C09D5/4496C08G18/227C08K3/013C08K2003/2241C09D163/00C25D13/06C09D7/40C09D5/44C09D5/4446C09D5/4473C25D13/04
Inventor 宫前治广小谷诚之大原哲矢
Owner นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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