Method for improving coating cure for article coated in phosphate-contaminated electrocoat coating composition and electrocoat coating composition

A technology of ion pollution and composition, applied in the direction of electrolytic coating, electrophoretic coating, coating, etc., can solve the problems of wasting time, poor filter loading, rough appearance, etc.

Active Publication Date: 2015-07-08
BASF COATINGS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both operations are undesirable: increased pigment levels lead to rough appearance, filter loading and poor U...

Method used

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  • Method for improving coating cure for article coated in phosphate-contaminated electrocoat coating composition and electrocoat coating composition
  • Method for improving coating cure for article coated in phosphate-contaminated electrocoat coating composition and electrocoat coating composition
  • Method for improving coating cure for article coated in phosphate-contaminated electrocoat coating composition and electrocoat coating composition

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Experimental program
Comparison scheme
Effect test

Embodiment

[0061] Preparation of dispersion

[0062] Dispersions A-D were prepared with the following compositions. Parts are by weight.

[0063]

[0064] 1. Aqueous Dispersion of Salted Amine Functional Epoxy Resin

[0065] Preparation of Electrocoating Coating Compositions

[0066]

[0067]

[0068]

[0069] 2. The phosphate solution is a commercial phosphate treatment obtained from an automobile assembly plant

[0070] 3. A 40% aqueous dispersion of lactated amine functional epoxy resin having 27% by weight of amine functional epoxy resin, 12% by weight of blocked isocyanate crosslinker and 2% by weight of plasticizer.

[0071]The curing response of the electrocoat coating composition was tested by the Gel Fraction Test Method according to the following procedure.

[0072] 1. Weigh and record the mass of a 1" x 4" phosphated steel disc (A).

[0073] 2. Electrocoat the wafer and cure using the desired cure program.

[0074] 3. Weigh and record the mass of the cured e...

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Abstract

An electrocoat coating composition contaminated with phosphate ions is treated by adding zirconium silicate to the coating composition. Aqueous electrocoat coating compositions including (1) a bismuth compound and that is free of tin compounds and free of bismuth hydroxide or (2) having a catalyst consisting essentially of a member selected from the group consisting of bismuth compounds and mixtures of these also include zirconium silicate.

Description

technical field [0001] The present invention relates to organic electrocoating coating compositions and methods, particularly those used as part of a coating process that includes phosphate pretreatment of metal articles prior to their electrocoating. Background technique [0002] This section provides information that may be helpful in understanding the present invention but is not necessarily prior art. [0003] Industrial coating of metal articles to be used in corrosive environments may involve the application of one or more inorganic and organic treatments and coatings. Painting systems ("paint shops") in automotive assembly plants are large, complex and expensive. For example, metal automobile bodies ("body-in-white") and components are subjected to multi-step treatments that include cleaning in one or more cleaning baths or spray tanks, phosphating baths as metal pre-treatment The steps carry out the application of a water-based phosphate paint, followed by various ...

Claims

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Application Information

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IPC IPC(8): C09D5/44C09D7/61
CPCC08K3/34C09D5/448C09D5/4488C09D7/1216C08K2003/321C09D7/61C08K3/32C25D13/02C25D13/10C25D13/22
Inventor R·D·席勒K·M·朔克
Owner BASF COATINGS GMBH
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