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Cathodic electrocoating compositions containing alkane sulfonic acid

A cathodic electrophoretic coating and alkane sulfonic acid technology, which is applied in the direction of electrophoretic coating, coating, thin material treatment, etc.

Inactive Publication Date: 2004-06-30
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Weak acids do not provide the desired increase in throwing power for many applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] Crosslinker resin solution

[0037] Add the following ingredients to a suitably equipped reactor:

[0038] part 1 parts by weight

[0039] MDI (methylene diphenyl diisocyanate) 1705.80

[0040] Methyl isobutyl ketone 402.30

[0041] Dibutyltin dilaurate 0.40

[0042] part 2

[0043] Alcohol mixture (72.5-73.5% of diethylene glycol monobutyl ether, 15.5-1106.7016.5% of ethanol

[0044] and 10.5-11.5% methanol)

[0045] part 3

[0046] Methyl isobutyl ketone 52.10

[0047] part 4

[0048] Butanol 9.40

[0049] Methyl isobutyl ketone 473.30

[0050] Total 3750.00

[0051] Part 1 was added to the reactor and heated to 74-76°C. Part 2 was fed to the reactor at a constant rate over a period of 120 minutes. The temperature of the reaction mixture was maintained at 107°C, and the reaction mixture was incubated at 107°C for an additional 3 hours. Part 3 and part 4 were added and the reaction mixture was cooled to ambient temperature.

[0052] The resu...

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Abstract

An improved aqueous cathodic electrocoating composition having a binder of an epoxy-amine adduct which is of an epoxy resin that has been reacted with an amine, and a blocked polyisocyanate crosslinking agent; wherein the improvement is the use of an alkane sulfonic acid as the neutralizing agent for the epoxy amine adduct to provide an electrocoating composition having improved throw power.

Description

technical field [0001] The invention relates to a cathodic electrophoretic paint composition, in particular to a cathodic electrophoretic paint composition containing an alkanesulfonic acid neutralizer. Background technique [0002] The coating of conductive substrates by electrophoretic painting (also known as electrodeposition) is well known and an important industrial process. Primer electrophoresis for automotive substrates is widely used in the automotive industry. In this method, a conductive object such as a vehicle body or an automobile part is immersed in a coating composition bath of an aqueous film-forming polymer emulsion, and this conductive object acts as an electrode in this electrophoretic painting process. An electrical current is passed between the object and an opposing electrode in electrical contact with the aqueous emulsion until the desired coating is deposited on the object. In cathodic electrophoretic painting, the object to be coated is the cathod...

Claims

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Application Information

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IPC IPC(8): C08G59/50C09D5/44C09D7/12
CPCC08G59/50C09D5/4457Y10T428/31511
Inventor J·A·安东内利C·斯科帕兹W·B·范德林德
Owner EI DU PONT DE NEMOURS & CO
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