Cathodic electrocoating compositions having improved appearance, improved edge converage and reduced craters

A composition, electrocoating technology, applied in the directions of organic silicon compounds, compounds of elements of Group 4/14 of the periodic table, electrophoretic coatings, etc. Lack of smoothness, poor adhesion, etc.

Inactive Publication Date: 2002-10-16
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Persistent problems with cathodic electrocoating compositions are the lack of smoothness of the cured coating surface, the presence of welds on the cured coating surface, and the lack of corner protection or corner hiding power of the composition
However, after baking, this additive has a tendency to migrate to the electrocoated surface, resulting in poor adhesion of primers or other coatings used in the automotive and other industries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] The preparation of embodiment anti-cratering agent

[0026] The preparation of anti-cratering agent is by the Jeffamine D2000 of 1000 parts  (polyoxypropylene diamine with a number average molecular weight of 2000 and 996.5 amine equivalents), 100 parts of Cardura  E-10 (glycidyl neodecanoate), 141.6 parts of Silquest Add A-187 (glycidoxypropyltrimethoxysilane) and 130 parts of 2-ethylhexanol into a suitable reactor, heat to 110°C in a dry nitrogen atmosphere, and keep the reaction mixture at 110 °C until the S-T Gardner-Holter viscosity is obtained. Next, the adduct was dispersed into an aqueous medium of 4049.6 parts deionized water and 66.3 parts lactic acid. The obtained adduct solution had a non-volatile content of 22%. Preparation of cross-linked resin solution

[0027] The preparation of ethanol-blocked polyisocyanate crosslinking resin solution is by adding 317.14 parts of Mondur  MR (methylene diphenyl diisocyanate), 47.98 parts ...

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PUM

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Abstract

A cathodic electrocoating composition comprises an aqueous carrier, a film forming binder, comprising an epoxy-amine adduct and a blocked polyisocyanate crosslinking agent, dispersed in the carrier, and a novel additive comprising the reaction product of (1) a polyoxy alkylene di or monoamine; (2) a glycidoxy alkyl alkoxy silane; and (3) a glycidyl compound selected from the group consisting of a glycidyl ester of a carboxylic acid and an alkyl glycidyl ether, which reaction product is hydrolyzed in the presence of acid and water to convert alkoxysilane moieties to silanol moieties. The electrocoat composition produces coatings having a smoother appearance with better edge coverage and fewer craters.

Description

Background of the invention [0001] The invention relates to a cathodic electrocoating composition, in particular to a cathodic electrocoating composition containing an anti-cratering agent which can significantly reduce welding seams and improve the corner covering power of the electrodeposited film of the composition. [0002] The coating of conductive substrates by electrodeposition, also known as electrocoating, is a well-known and important industrial process. Electrodeposition of primers for automotive substrates is widely used in the automotive industry. In this method, an electrically conductive part, such as an automobile body or an automobile part, is immersed in a bath of a coating composition of an aqueous emulsion of a film-forming polymer and serves as an electrode for an electrodeposition process. Electric current is passed between the opposite electrodes where the part is in electrical contact with the aqueous emulsion until the desired coating is deposited on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C07F7/08C08G65/22C08G65/336C08L71/02C09D5/44C09D179/00C09D183/06
CPCC07F7/0836C08G65/22C08G65/336C08L71/02C09D5/4457C08L63/00C09D5/4438
Inventor A·加姆
Owner EI DU PONT DE NEMOURS & CO
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