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Cationic electrodeposition coating composition

A cationic electrodeposition and composition technology, used in electrophoretic coatings, polyacetal coatings, epoxy resin coatings, etc., can solve problems such as insufficient prevention of uneven drying of electrodeposited coatings, and achieve uneven drying. The effect of defoaming properties

Inactive Publication Date: 2006-12-13
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the defoaming performance of the cationic electrodeposition coating composition described in Patent Document 3 is excellent, it is insufficient to prevent uneven drying of the electrodeposition coating

Method used

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  • Cationic electrodeposition coating composition
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  • Cationic electrodeposition coating composition

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0179] Preparation of amine-modified epoxy resin

[0180] In a flask equipped with a stirrer, a cooling tube, a nitrogen introduction tube, a thermometer and a dropping funnel, 92 parts of 2,4- / 2,6-tolylylene diisocyanate (weight ratio=8 / 2), 95 parts Parts of methyl isobutyl ketone (hereinafter abbreviated as MIBK) and 0.5 parts of dibutyltin dilaurate. While stirring the reaction mixture, 21 parts of methanol were added dropwise. The reaction was started from room temperature and the temperature was raised to 60°C by exotherm. Then, after the reaction was continued for 30 min, 57 parts of ethylene glycol mono-2-ethylhexyl ether were added dropwise from the dropping funnel. Separately, 42 parts of adducts of bisphenol A and 5 mol of propylene oxide were added to the reaction mixture. The reaction proceeds mainly in the range of 60-65° C. and continues until the absorption based on the isocyanate group disappears in the IR spectroscopic measurement.

[0181] Then, 365 parts...

preparation Embodiment 2

[0184] Preparation of blocked isocyanate curing agent

[0185] In the reaction vessel, 1250 parts of diphenylmethane diisocyanate and 266.4 parts of MIBK were charged, and after heating the mixture to 80° C., 2.5 parts of dibutyltin dilaurate were added. A solution in which 226 parts of ε-caprolactam was dissolved in 944 parts of butyl cellosolve was added dropwise to the mixture at 80°C over 2 hours. Further, after it was heated at 100° C. for 4 hours, it was confirmed that absorption based on isocyanate groups disappeared in IR spectrum measurement, and after standing to cool, 336.1 parts of MIBK were added to obtain a blocked isocyanate curing agent.

preparation Embodiment 3

[0187] Preparation of Pigment Dispersion Resin

[0188] First, 222.0 parts of isophorone diisocyanate (hereinafter, abbreviated as IPDI) was charged into a reaction vessel equipped with a stirring device, a cooling pipe, a nitrogen introduction pipe and a thermometer, diluted with 39.1 parts of MIBK, and added to it Charge 0.2 parts of dibutyltin dilaurate. Then, after heating it to 50° C., 131.5 parts of 2-ethylhexanol were added dropwise under stirring in a dry nitrogen atmosphere over 2 hours. The reaction temperature was maintained at 50°C with appropriate cooling. As a result, IPDI half-blocked with 2-ethylhexanol was obtained (solid content of resin: 90.0%).

[0189] Then, 87.2 parts of dimethylethanolamine, 117.6 parts of 75% lactic acid aqueous solution and 39.2 parts of ethylene glycol monobutyl ether were sequentially added to a suitable reaction vessel, and the mixture was stirred at 65° C. for about 30 min to prepare a quaternary salt ( quaternary) conversion ag...

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Abstract

The invention discloses a positive ion electrodeposition coating composition which comprises: binding resin which includes positive ion epoxide resin and capping isocyanate curing agent, and defoaming agent; wherein the defoaming agent comprises polyoxyalkylenes compound (A) represented by at least on formula (1) to (3): {R-(OA)n1}t-mQ{-(OA)n2-L}m(1), {R-(OA)n1}t-mQ[-(OA)n2-L-(OA)n3-Q{-(OA)n4-R}t-1]m(2), {R-(OA)n1}t-1Q-L-Q{-(OA)n2-L}t-1(3). Wherein Q is a reactive residue formed by removing hydrogen atom from t primary hydroxy groups of the non-deacidizing diose or triose; L is a reactive residue of the isocyanate or dihalogen alkyl group; OA is oxidation alkyl group with 2 to 4 carbons; each of n1 to n4 is an integer which is between 2 to 40; t is an integer between 2 to 4; and m is an integer between 1 to 3 and is less than t, wherein the general number of OA in molecule is Q10 to 80.

Description

technical field [0001] The present invention relates to a cationic electrodeposition coating composition comprising a defoamer, in particular to a cationic electrodeposition coating composition comprising a defoamer having a specific structure and the like. Background technique [0002] Cationic electrodeposition coating is performed by immersing a coated article as a cathode in an electrodeposition bath containing a cationic electrodeposition coating composition and applying a voltage. The cationic electrodeposition coating composition contained in the electrodeposition bath is a dispersion containing an aqueous medium, a binder resin dispersed in the aqueous medium, a pigment and various additives. Therefore, in order to maintain the uniformity of the coating, it is required to be fluidized at all times. [0003] For example, in the electrodeposition coating step of the body of an automobile, a cationic electrodeposition coating composition is contained in a large-scale e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/44
CPCB01D19/0404C09D5/448C09D5/443C09D159/04C09D159/00
Inventor 三原康央山本健史
Owner NIPPON PAINT CO LTD
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