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Electrocoating composition and method for replacing phosphate pretreatment

A composition and phosphorylation technology, applied in the direction of electrophoretic coatings, coatings, etc., can solve the problems of large, complex and expensive painting systems

Active Publication Date: 2011-12-14
BASF COATINGS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Painting systems in automotive assembly plants ("paint shops") are large, complex, and expensive

Method used

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  • Electrocoating composition and method for replacing phosphate pretreatment
  • Electrocoating composition and method for replacing phosphate pretreatment
  • Electrocoating composition and method for replacing phosphate pretreatment

Examples

Experimental program
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Effect test

preparation example Construction

[0126] In the preparation of cathodic electrocoat coating compositions, non-limiting examples of suitable acids include phosphoric acid, phosphonic acid, propionic acid, formic acid, acetic acid, lactic acid or citric acid. The salt-forming acid can be blended with the binder, mixed with the water, or both, prior to adding the binder to the water. The acid is used in an amount to fully neutralize a sufficient amount of the amine groups to render the binder water dispersible. The amine groups can be completely neutralized; however, partial neutralization is usually sufficient to impart the desired water dispersibility. Similarly, in the preparation of anodic electrocoat coating compositions, non-limiting examples of the carboxyl groups of the primary resins are neutralized with suitable bases, including Lewis bases or Bronsted bases such as amines and hydroxides such as Potassium Hydroxide and Sodium Hydroxide. Exemplary amines include N,N-dimethylethylamine (DMEA), N,N-dieth...

Embodiment 1

[0173] An electrocoat bath was prepared by combining 1211.7 parts of Preparation C, 150.8 parts of Preparation M, and 1137.5 parts of deionized water. The water and Preparation C resin emulsion were combined in a vessel with constant stirring, and Preparation M was added while stirring. The bath solids content was 19% by weight.

Embodiment 2

[0175] An electrocoat bath was prepared by combining 1211.7 parts of Preparation C, 148 parts of Preparation J, and 1140.5 parts of deionized water. Water and Preparation C resin emulsion were combined in a vessel with constant stirring, and Preparation J was added while stirring. The bath solids content was 19% by weight.

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Abstract

An aqueous electrodeposition coating composition comprising a cathodically electrodepositable binder, the binder comprising a phosphorylated resin and a carboxyl group separated by from 2 to 4 carbons from an ester group, provides corrosion protection equivalent to that obtained by the conventional phosphate pretreatment-electrodeposition coating process. The aqueous coating composition may comprise a metal oxide selected from the group consisting of bismuth oxide, vanadium oxide, manganese oxide, cobalt oxide, zinc oxide, strontium oxide, yttrium oxide, molybdenum oxide, zirconium oxide, lanthanum oxide, oxides of the lanthanide series of elements and combinations thereof. The phosphorylated resin may comprise a phosphorous-containing group in which X is a hydrogen, a monovalent hydrocarbon, an alkyl group such as an aminoalkyl group, or an oxygen atom having a single covalent bond to the phosphorous atom, and each oxygen atom has a covalent bond to a hydrogen atom, an alkyl group, an aryl group, an alkylaryl group, an arylalkyl group, or the resin, with the caveat that at least one oxygen atom has a covalent bond to resin. The aqueous coating composition may comprise a tridentate amine ligand.

Description

field of invention [0001] The present invention relates to coatings for metal substrates, especially electrocoating coating compositions, methods of preparing them, methods of coating metal substrates, especially methods of electrodepositing coatings onto conductive substrates, and coated metal substrates. Substrate. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Industrial coating of metal articles to be used in corrosive environments may include 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, the multi-step cleaning treatment of metal car bodies (“body in white”) and parts in one or more cleaning baths or spray tanks, the application of water-based phosphate coatings in phosphating baths as a metal pretrea...

Claims

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Application Information

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IPC IPC(8): C09D5/44
CPCC09D5/4426C09D5/4442C09D5/4473
Inventor A・乔艾T・S・迪塞姆伯C・A・斯坦特斯
Owner BASF COATINGS GMBH
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