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Single bath autodeposition coating for combination metal substrates and methods therefor

A technology of self-deposition and substrate, applied in metal material coating process, coating, transportation and packaging, etc., can solve problems such as difficulties

Active Publication Date: 2014-02-26
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Even in high peroxide autodeposition baths, uniform autodeposition coatings deposited simultaneously in the same bath are obtained overall on two different metal surfaces of the workpiece (e.g. on steel surfaces and on metal surfaces containing zinc or aluminium) there are still difficulties

Method used

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  • Single bath autodeposition coating for combination metal substrates and methods therefor
  • Single bath autodeposition coating for combination metal substrates and methods therefor
  • Single bath autodeposition coating for combination metal substrates and methods therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Nitroethane added after polymerization

[0098] The modified autodeposition coating bath was prepared as follows: In a 1 liter container, 130.21 g of 930 Make-up (available from the Surface Technologies Division of Henkel Corporation's self-deposition coating concentrate, which is described as an epoxy / acrylic copolymer, a blocked crosslinker, and a water-based dispersion of carbon black pigment) with 15.0 g Starter 300 (a product available from the Surface Technologies Division of Henkel Corporation containing an autodeposition promoter and other components), 854.8 g deionized water, 0.027 g HF, and 2.0 g nitroethane were mixed.

[0099] The bath was mixed for 1 hour and the bath was kept stirring. Note that the bath does not condense, separate or settle. Measure and adjust bath parameters.

[0100] Oxidation-reduction potential (Redox) value 372mV

[0101] Lineguard101 meter reads 150 microamps

[0102] Bath temperature 20-25°C

[0103] The redox potential v...

Embodiment 2

[0114] Addition of nitroethane before polymerization

[0115] In a process utilizing a microemulsion polymerization step, a modified self-depositing microemulsion dispersion is prepared as follows by using nitroethane as a prepolymerization additive:

[0116] Into a clean 2 liter 4 necked flask equipped with stirrer, nitrogen inlet, condenser and addition funnel was charged a) 167.8 g of epoxy resin and b) 20.5 g of blocked isocyanate. To this flask was charged c) 174.5 g of ethylenically unsaturated monomer, d) 7.3 g of ester alcohol (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate propionic acid) and e) 9.0 g of a homogeneous mixture of nitroethane and mix it until the epoxy resin and blocked isocyanate are dissolved. A homogeneous mixture of f) 16.2 g of anionic surfactant 28% NV and g) 600 g of deionized water was added and mixed within 10 minutes. Remove the crude dispersion from the flask and pass it through the M-110F to form a fine particle dispersion microemulsi...

Embodiment 3a

[0118] Autodeposition composition concentrate prepared using the dispersion of Example 2

[0119] An autodeposition composition concentrate comprising an anionically stabilized emulsion of the nitroethane-modified epoxy / acrylic acid of Example 2 was prepared by adding a carbon black pigment slurry as follows: In a 1.5 liter vessel, 166.0 g of The dispersion of Example 2 at 35.96% solids was combined with 6.0 g of carbon black pigment slurry (40.5% solids) and the material was allowed to mix for 10-60 minutes. No condensation or precipitation was noted.

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Abstract

This invention relates to an autodeposition bath composition comprising a nitrogen containing compound, said bath being suitable for generating a uniform autodeposition coating on two or more of ferrous, aluminum, magnesium and zinciferous multi-metal substrate surfaces, treated either sequentially or simultaneously. The invention also provides autodeposition concentrate compositions for use in the bath, methods of making and using the concentrate and bath, as well as metal articles comprising an autodeposition coating according to the invention.

Description

technical field [0001] The present invention relates to autodepositing bath compositions; more particularly, the present invention relates to compositions suitable for producing a uniform coating on the surface of two or more multi-metal substrates selected from iron, aluminum, magnesium and zinc. Autodeposition bath compositions for autodeposition coatings. The invention also provides autodepositing concentrate compositions useful in the baths, methods of making and using the concentrates and baths, and metal articles comprising the autodeposition coatings of the invention. Background technique [0002] Autodeposition has been applied commercially to steel for about 30 years, and the use is now well established. 细节参见例如美国专利号3,063,877;3,585,084;3,592,699;3,674,567;3,791,431;3,795,546;4,030,945;4,108,817;4,178,400;4,186,226;4,242,379;4,234,704;4,636,264;4,636,265;4,800,106;和5,342,694。 The disclosures of all of these patents are incorporated herein by reference. Various resin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/32C08L33/04C23C14/12C23C14/22C08L101/00
CPCC23C2/04C23C2/26C08G18/8061C23C2/02C23C2/28C09D175/04C09D135/06C09D133/08C08G18/58Y10T428/31678
Inventor G·库玛尔X·邱B·M·艾哈迈德O·L·阿布-沙纳布M·N·塞克哈兰B·马文
Owner HENKEL KGAA
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