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Edge anticorrosive electrophoretic coating composition, preparation method and application

A technology of electrophoretic coatings and compositions, applied in anti-corrosion coatings, electrophoretic coatings, polyurea/polyurethane coatings, etc.

Active Publication Date: 2019-03-22
NIPPON PAINT GUANGZHOU +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In the technical documents disclosed above, various preparation methods for the preparation of cationic microgels for electrophoretic coatings are mentioned, and a preparation method for phosphorylation-modified epoxy resins that can be used to improve the corrosion resistance of workpieces is mentioned, but no clear evidence has been found. Mention the application example of introducing phosphate repeating units into amination-modified epoxy molecular chains to prepare cationic microgels, and adding phosphate-modified cationic microgels to electrophoretic coatings to improve edge corrosion resistance

Method used

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  • Edge anticorrosive electrophoretic coating composition, preparation method and application
  • Edge anticorrosive electrophoretic coating composition, preparation method and application
  • Edge anticorrosive electrophoretic coating composition, preparation method and application

Examples

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Effect test

Embodiment 1

[0107] Embodiment 1 prepares organic amine modified epoxy resin

[0108] Add 1850 parts of bisphenol A type epoxy resin (epoxy equivalent EEW=185), 868 parts of bisphenol A and 450 parts of methyliso butyl ketone. After the addition, the temperature of the reaction system was raised to 120°C. After the raw materials were completely dissolved and mixed uniformly, 3.7 parts of triphenylphosphine was added, and then the temperature of the reaction system was raised to 145°C. The reaction was continued at this temperature for 2 h, and when the epoxy equivalent of the reaction system reached the theoretical value (EEW=1140), the heating was stopped. When the reaction system was cooled to 90°C, 139 parts of N-methylethanolamine and 143 parts of ketimine (prepared by the reaction of diethylenetriamine and methyl isobutyl ketone in a molar ratio of 1:2 were added successively, the final product The solid content is 100%), the temperature of the reaction system was raised to 120°C ag...

Embodiment 2

[0109] Embodiment 2 prepares organic amine modified epoxy resin

[0110] Add 1850 parts of bisphenol A type epoxy resin (epoxy equivalent EEW=185), 741 parts of bisphenol A, 84 parts of adipic acid in the 5L reactor equipped with stirrer, thermometer, nitrogen conduit and reflux condenser and 435 parts of methyl isobutyl ketone. After the feeding is complete, the temperature of the reaction system is raised to 120°C. After the raw materials are completely dissolved and mixed uniformly, 3 parts of triphenylphosphine are added, and then the temperature of the reaction system is raised to 145°C. The reaction was continued at this temperature for 2 h, and when the epoxy equivalent of the reaction system reached the theoretical value (EEW=1140), the heating was stopped. When the reaction system was cooled to 90°C, 139 parts of N-methylethanolamine and 143 parts of ketimine (prepared by the reaction of diethylenetriamine and methyl isobutyl ketone in a molar ratio of 1:2 were added...

Embodiment 3

[0111] Embodiment 3 prepares organic amine modified epoxy resin

[0112]Add 2000 parts of bisphenol S type epoxy resin (epoxy equivalent EEW=200), 887 parts of bisphenol A and 550 parts of methyliso butyl ketone. After the feeding is complete, the temperature of the reaction system is raised to 120°C. After the raw materials are completely dissolved and mixed uniformly, 4 parts of triphenylphosphine are added, and then the temperature of the reaction system is raised to 145°C. The reaction was continued at this temperature for 2 h, and when the epoxy equivalent of the reaction system reached the theoretical value (EEW=1300), the heating was stopped. When the reaction system was cooled to 90°C, 125 parts of N-methylethanolamine and 150 parts of ketimine (prepared by the reaction of diethylenetriamine and methyl isobutyl ketone in a molar ratio of 1:2, the final product The solid content is 100%), the temperature of the reaction system was raised to 120°C again, and the reacti...

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Abstract

The invention provides an edge anticorrosive electrophoretic coating composition, coating and application. The edge anticorrosive electrophoretic coating composition comprises component A: 15 to 35 parts of at least one organic amine modified epoxy resin; 5 to 20 partof at least one blocked isocyanate; 1 to 10 parts of at least one film-forming auxiliary; 1 to 5 parts of at least one phosphate-modified cationic microgel; 1 to 10 parts of at least one first organic acid; 0.5 to 5 parts of at least one auxiliary solvent; and 30 parts of deionized water; and component B: 10 to 25 parts of at least one epoxy resin containing quaternary ammonium salt and / or tertiary sulfonium salt group; 5-40 parts of at least one pigment; 5 to 40 parts of at least one filler; 0.5 to 5 parts of at least one dispersing aid; 30 to 70 parts of second deionized water. By adopting the invention, the coverage of the electrophoretic coating on the edge of a workpiece can be greatly improved, and the edge corrosionresistance can be improved.

Description

technical field [0001] The invention belongs to the technical field of paint preparation, and in particular relates to an edge anticorrosion electrophoretic paint composition, a preparation method and an application. Background technique [0002] Since the 1970s, cathodic electrophoretic coatings have been more and more widely used in many industries due to their own advantages. As we all know, during the high-temperature baking and curing process of cathodic electrophoretic coatings, due to the gradual increase of the fluidity of the coating film, the paint film will shrink during the cross-linking and curing process, making the edge of the workpiece, especially the edge of the workpiece with sharp edges The coating film coverage of the parts is too low, and the paint film thickness is too thin, which reduces the anti-corrosion performance of these parts. For the field of heavy industry, especially the automobile industry, due to the particularity of automobile products, a...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/08C09D5/44
CPCC09D5/08C09D5/4465C09D5/448
Inventor 张萌夏天渊方黎明吴桂兰曾燕勤李舫
Owner NIPPON PAINT GUANGZHOU
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