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Cation electrophoretic coating composition comprising phosphonio group

A cationic electrophoresis and composition technology, applied in electrophoretic coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve the problems of poor compatibility, high water solubility, and failure to display sufficient anti-corrosion performance.

Inactive Publication Date: 2002-10-23
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when this compound is added to a cationic electrodeposition paint, it fails to exhibit sufficient anticorrosion performance because of its high water solubility and consequent poor compatibility with the resin components constituting the paint film

Method used

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  • Cation electrophoretic coating composition comprising phosphonio group

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0127] Preparation Example 1 Preparation of phosphonium group-containing compound (based on monofunctional epoxy compound)

[0128] The reactor was charged with 325.0 g of NH-300P (epoxy equivalent 325, nonylphenyl glycidyl ether; product of Sanyo Chemical Ind., Ltd.), and heated to 100°C. Then an aqueous solution prepared from 208.2 g of tris(3-hydroxypropyl)phosphine (Hishichaulin P-500, a product of Nippon Chemical Industrial Co., Ltd.), 60.0 g of acetic acid and 144.0 g of deionized water was gradually added, and the resulting mixture was kept at 75°C.

[0129] After it was confirmed that the acid value was stabilized at not more than 5, 251.5 g of deionized water was added, followed by cooling. Then the product (non-volatile matter (hereinafter often referred to as NV) = 60%, number average molecular weight 590, phosphonium group content 1.7 meq / g, conversion rate of epoxy group to phosphonium group = 100% ). The conversion from epoxy groups to phosphonium groups was d...

preparation Embodiment 2

[0130]Preparation Example 2 Preparation of Compounds Containing Phosphonium Groups (Based on Novolac Epoxy Compounds)

[0131] Into the reaction vessel were added 2426.4 g of YDCN-703 (epoxy equivalent 202.2, cresol novolac epoxy resin, 12 cores, product of Tohto Chemical Co.) and 1257.0 g of ethylene glycol monobutyl ether. The resulting mixture was heated at 130°C under a nitrogen atmosphere to dissolve uniformly.

[0132] Then, after cooling to 100°C, an aqueous solution prepared from 1619.1 g of Hishicaulin P-500, 432.0 g of acetic acid, and 1728 g of deionized water was gradually added, and then, cooled and kept at 75°C. The reaction was continued until the acid value was not greater than 5.

[0133] After it was confirmed that the acid value was stabilized at not more than 5, 1492.5 g of deionized water was added, followed by cooling. (NV=50%, number average molecular weight 4500, phosphonium group content 1.6 meq / g, conversion rate of epoxy group into phosphonium grou...

preparation Embodiment 3

[0134] Preparation Example 3 Preparation of a compound containing a phosphonium group (based on a novolac epoxy resin (containing an unsaturated group))

[0135] 2426.4 g of YDCN-703 (epoxy equivalent weight 202.2, cresol novolac epoxy resin, 12 cores, product of Tohto Chemical Company) and 1682.4 g of enzyme-catalyzed linseed oil fatty acid were added to the reactor, and the resulting mixture was heated to 120 °C. After uniform dissolution, 7.28 g of ethyltripropylphosphonium iodide was added. After confirming that the acid value was not more than 1, 2426.4 g of ethylene glycol monobutyl ether was added.

[0136] Then, an aqueous solution prepared from 1349.3 g of Hishicaulin P-500, 360.0 g of acetic acid and 3384.4 g of deionized water was added gradually, maintaining the resulting mixture at 75°C.

[0137] After it was confirmed that the acid value was stabilized at not more than 5, the resulting reaction mixture was cooled, and the product was discharged. (NV=50%, numbe...

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Abstract

The present invention provides a cationic electrophoretic paint composition which does not contain heavy metal rust inhibitors such as lead compounds from the viewpoint of environmental protection, and at the same time provides a paint film with excellent corrosion resistance. The cationic electrophoretic coating composition comprises a water-soluble or water-dispersible compound containing a phosphonium group, and the compound has a group represented by the above general formula (1), in which the R groups can be the same or Differently, each represents an alkyl group or a hydroxyalkyl group, and at least one R group is a hydroxyalkyl group.

Description

Field of Invention [0001] The present invention relates to a cationic electrophoretic coating composition, and more particularly to a cationic electrophoretic coating composition to which a phosphonium group-containing compound is added as a so-called organic inhibitor having a corrosion-inhibiting effect. Background of the Invention [0002] Cationic electrophoretic coatings are not only capable of coating inaccessible parts of substrates with complex shapes, but also create conditions for automatic continuous painting, thus realizing a wide range of applications as coatings with large and complex shapes and those requiring high rust resistance substrates such as undercoats for automobile bodies. Furthermore, electrophoretic painting technology is economical compared to other painting technologies because the painting efficiency is extremely high, which in turn is widely used on an industrial scale. [0003] Cationic electrodeposition coatings commonl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D201/00C08G59/14C09D5/44C09D7/12C09D163/04C09D175/04
CPCC08G59/1488C09D5/4457C09D5/4492C09D5/44
Inventor 野尻弘之
Owner NIPPON PAINT CO LTD
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