Method for coating metallic surfaces with a composition that is rich in polymers

A technology of metal surface and composition, applied in the direction of surface coating liquid device, polyester coating, pretreatment surface, etc., can solve the problem that the effect of adding zirconium acetylacetonate has not been mentioned, so as to improve the strength and/or Or flexibility, improvement of adhesion, effect of paint adhesion improvement

Inactive Publication Date: 2010-05-12
CHEMETALLGMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, among the zirconium and titanium compounds mentioned in the text, there is no chelating agent other than zirconium acetylacetonate
However, the effect of adding zirconium acetylacetonate was not mentioned

Method used

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  • Method for coating metallic surfaces with a composition that is rich in polymers
  • Method for coating metallic surfaces with a composition that is rich in polymers
  • Method for coating metallic surfaces with a composition that is rich in polymers

Examples

Experimental program
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example and comparative example

[0199] The examples described below are intended to describe the subject-matter of the invention in more detail.

[0200] A) Compositions mainly based on chelating agents and silanes:

[0201] For the preparation of the aqueous concentrate, at least one partially hydrolyzed silane is aged for at least 2 weeks and optionally hydrolyzed thereby. Subsequently, the metal chelating agent listed in Table 1 was added. Subsequently, this concentrate is diluted with water, optionally with the addition of agents for adjusting the pH, such as ammonia, in order to obtain a ready-to-use treatment solution. In each case, at least 3 pieces of hot-dip galvanized steel or The steel plates were contacted with the corresponding treatment solution at 25°C by roll coating and drying. The metal sheets thus treated were dried at 90°C PMT and subsequently tested for their corrosion protection capabilities.

[0202] Examples E1-E8, including Comparative Example CE4, show the effect of adding a ...

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Abstract

The invention relates to a method for coating a metallic surface with an aqueous composition for pretreating before applying another coating or for treating said metallic surface. In addition to water, the composition contains: a) at least one hydrolyzable or at least partially hydrolyzed silane; b) at least one metal chelate, if necessary, also; c) at least one organic film former; and d) at least one long-chain alcohol that serves as a film forming aid and/or. The unsoiled, scoured, cleaned and/or pretreated metallic surface is brought into contact with the aqueous composition and a film is formed on the metallic surface, is subsequently dried, compacted in part or completely by film formation and, if necessary, additionally hardened. The dried and, if necessary, additionally hardened film has a layer thickness ranging from 0.01 to 10 mum. The invention also relates to corresponding aqueous compositions.

Description

[0001] This application is a divisional application of the invention patent application with application number 200480010755.4 and application date of February 25, 2004. technical field [0002] The present invention relates to a method of coating a metal surface with an aqueous composition comprising a silane and a metal chelating agent and optionally an organic film former. The invention also relates to the use of corresponding aqueous compositions and substrates coated according to the method of the invention. Background technique [0003] The method most commonly employed hitherto as a surface treatment or pretreatment on metals, especially metal strips, prior to painting is based on the application of chromium(III) and / or chromium(VI) compounds together with various additives. Due to the toxicological and ecological risks associated with such methods and also due to the foreseeable legal restrictions on the use of chromate-containing methods, alternatives to these metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05C23C22/28C09D175/14C09D167/06C09D125/14C09D123/08B05D3/10C09D4/00C09D5/08C09D7/61C09D7/63C23C22/50C23C22/53C23C22/60C23C22/68C23C22/74C23C22/83
CPCC09D4/00C23C2222/20C09D5/08C23C22/50C23C22/74C23C22/83C23C22/68C23C22/48Y02T50/67C23C22/53C23C22/60C09D7/61C09D7/63Y10T428/31663C08K5/0091C08K5/5435C08G77/04C08G77/26Y02T50/60C08K3/36C09D133/02C09D133/08C09D175/06C23C22/82
Inventor H·多姆斯J·施奈德
Owner CHEMETALLGMBH
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