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Composition for metal surface treatment

A metal surface treatment and composition technology, applied in the field of metal surface treatment compositions, can solve the problems of inability to obtain corrosion resistance, etc.

Inactive Publication Date: 2015-08-12
NIHON PARKERIZING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, the bismuth compounds in these patent documents are only used as substitutes for chromium compounds and lead compounds, and sufficient corrosion resistance cannot be obtained without substrate treatment such as zinc phosphate-based chemical conversion treatment.

Method used

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  • Composition for metal surface treatment
  • Composition for metal surface treatment
  • Composition for metal surface treatment

Examples

Experimental program
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Effect test

preparation example Construction

[0106] *The preparation method of the amide of bisphenol A type modified epoxy resin

[0107] First, predetermined amounts of modified resin (B), epoxy resin (C), and bisphenol (D) are mixed and heated and stirred. The heating temperature is preferably 70 to 100°C. After each raw material is dissolved, a catalyst is added, and the heating temperature is raised to carry out synthesis. Catalysts generally use tertiary amines such as dimethylbenzylamine. Usually the synthesis temperature is controlled at 120°C to 150°C.

[0108] By adjusting the synthesis temperature and time, an epoxy resin having a predetermined epoxy equivalent can be synthesized. The epoxy equivalent was calculated according to the epoxy equivalent measurement prescribed in JIS K7236. The epoxy equivalent at this time is preferably 800-10000, more preferably 800-5000, and most preferably 800-3000. When the epoxy equivalent is larger, the emulsion stability tends to decrease at the time of emulsion prepar...

preparation example 1

[0144] Epoxy resin #828 (manufactured by Mitsubishi Chemical Corporation, epoxy equivalent: 180): 114.0 g, polycaprolactone di Alcohol Placcel208 (made by Daicel Chemical Co., Ltd.): 41.5 g, bisphenol A: 45.6 g, 0.1 g of dimethylbenzylamine, reacted at 130 degreeC until epoxy equivalent became 1000. After completion of the reaction, 55.5 g of butyl cellosolve was added, and 12.5 g of methylethanolamine and 8.6 g of ketimide of diethylenetriamine were further added, and reacted at 90° C. for 2 hours. Added blocked isocyanate: 105.5g, dibutyltin diacetate: 3.2g, acetic acid 5.4g, after stirring evenly, 578.1g of deionized water was dripped in for about 1 hour while vigorously stirring to obtain a solid content concentration of 33%, A water-based resin emulsion (A1) having a zeta potential of 69.3 mV in an aqueous medium of pH 7 and a zeta potential of 8.2 mV in an aqueous medium of pH 11.

preparation example 2

[0146] Epoxy resin #828 (manufactured by Mitsubishi Chemical Corporation, epoxy equivalent: 180): 114.0 g, polycaprolactone di Alcohol Placcel208 (made by Daicel Chemical Co., Ltd.): 41.5 g, bisphenol A: 45.6 g, 0.1 g of dimethylbenzylamine, reacted at 130 degreeC until epoxy equivalent became 1000. After completion of the reaction, 55.5 g of butyl cellosolve was added, and 11.3 g of methylethanolamine and 7.8 g of diethylamine were further added, and reacted at 90° C. for 2 hours. Added blocked isocyanate: 105.5g, dibutyltin diacetate: 3.2g, acetic acid 5.4g, after stirring evenly, 578.1g of deionized water was dripped in for about 1 hour while vigorously stirring to obtain a solid content concentration of 33%, A water-based resin emulsion (A2) having a zeta potential of 55.1 mV in an aqueous medium of pH 7 and a zeta potential of 8.1 mV in an aqueous medium of pH 11.

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Abstract

[Problem] To provide a means for forming on a metal material a film for imparting sufficient corrosion resistance without pretreatment such as zinc phosphate-based conversion coatings. [Solution] A metal surface treatment composition which is used in an energization method having multiple stages in the same bath and which contains Bi ions and a resin emulsion in which at least one type of cationic resin is dispersed in water, wherein the zeta potential of the aforementioned resin emulsion in a pH5-pH9 aqueous medium is +40mV to +100mV.

Description

technical field [0001] The present invention relates to a metal surface treatment composition capable of forming a film capable of imparting excellent corrosion resistance and coating appearance on a metal material, especially a complex-shaped metal structure, and a metal surface treatment method using the same. Background technique [0002] Conventionally, as a method for imparting excellent corrosion resistance to various metal materials, especially metal structures with complex shapes, electrodeposition coating with high throwing ability is generally performed. However, most of the electrodeposition coatings obtained by electrodeposition coating cannot obtain the desired corrosion resistance, so a chemical conversion coating such as a standard zinc phosphate-based chemical conversion treatment is applied before electrodeposition coating. surface treatment. [0003] Electrodeposition coating can be roughly divided into: Anionic electrodeposition coating in which a coating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D201/00C09D5/02C09D5/08C09D5/44C25D13/10
CPCC09D5/4488C09D5/4438C25D13/12
Inventor 和智大介屋部幸诚原真纯冈田荣作
Owner NIHON PARKERIZING
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