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Zinc-plated steel sheet having coating film formed thereon and having excellent white rust resistance

A galvanized steel sheet and coating technology, which is applied in the direction of plating, coating, anti-corrosion coating, etc. of superimposed layers, can solve the problems of white rust on the end face and cannot fully suppress white rust, and achieve excellent white rust resistance, Inhibits the formation of zinc oxide, excellent corrosion resistance effect

Active Publication Date: 2012-11-21
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] A metallic material having a coating film composed of a coating composition described in PTL1 and PTL2 generally has excellent corrosion resistance; however, compared with a metallic material having a coating film consisting of a coating composition using a chromium pigment, especially When the metal material is a galvanized steel sheet, there is a problem that a large amount of white rust is generated on the end surface especially at the early stage of use
In addition, generation of white rust cannot be sufficiently suppressed

Method used

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  • Zinc-plated steel sheet having coating film formed thereon and having excellent white rust resistance
  • Zinc-plated steel sheet having coating film formed thereon and having excellent white rust resistance
  • Zinc-plated steel sheet having coating film formed thereon and having excellent white rust resistance

Examples

Experimental program
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Effect test

preparation example a1

[0222] Preparation example a1: Synthesis of polyester resin Aa1 solution

[0223] The starting material mixture shown below was placed in a reaction vessel equipped with a stirrer, thermometer, reflux condenser, etc., and heated from 160°C to 230°C over 3 hours. The produced water was distilled off by a rectification column, and the resulting product was kept at 230° C. for 1 hour. Thereafter, xylene was added thereto, dehydration was performed under reflux of xylene at 230° C., and esterification reaction was performed.

[0224] Ethylene glycol: 0.9mol

[0225] Neopentyl glycol: 0.1mol

[0226] Isophthalic acid: 0.95mol

[0227]When the acid value reached about 0, the resulting product was cooled to 140°C for 2 hours. After cooling, Swasol 1500 (high-boiling aromatic petroleum solvent, produced by Maruzen Petrochemical Co., Ltd.) was added thereto to thereby obtain a polyester resin Aa1 solution having a solid content of 35%. The obtained resin had a number average molec...

preparation example a2

[0229] Preparation example a2: Resole phenolic resin Ba1 solution

[0230] 100 parts of bisphenol A, 178 parts of 37% aqueous formaldehyde solution, and 1 part of sodium hydroxide were placed in a reaction vessel, and a reaction was performed at 60° C. for 3 hours. Thereafter, the reaction product was dehydrated under reduced pressure at 50 °C for 1 h. 100 parts of n-butanol and 3 parts of phosphoric acid were successively added thereto, and the reaction was performed at 110° C. to 120° C. for 2 hours. After the reaction was completed, the resulting solution was filtered, and the resulting sodium phosphate was filtered off to obtain a resole phenolic resin Ba1 solution with a solid content of 50%. The obtained resin had a number average molecular weight of 880, and had an average of 0.4 methylol groups and 1.0 alkoxymethyl groups per benzene nucleus.

[0231] Coating composition (I) preparation 1

preparation example a3

[0233] Dissolve 90 parts of Epikote#1009 (manufactured by Japan Epoxy Resin Co., Ltd., bisphenol A type epoxy resin, hydroxyl-containing resin) in 135 parts of mixed solvent 1 (containing cyclohexanone / ethylene glycol monobutyl Ether / Solvesso 150 (manufactured by Esso Sekiyu K.K., high-boiling aromatic hydrocarbon solvent)=3 / 1 / 1 (mass ratio)) to obtain an epoxy resin solution. Then, 225 parts of this epoxy resin solution and 20 parts of vanadium pentoxide, 20 parts of calcium phosphate, 20 parts of calcium silicate, 20 parts of titanium dioxide, 20 parts of barium oxide and an appropriate amount of mixed solvent 2 (comprising Solvesso 150 (by Esso Sekiyu K.K. production, high-boiling aromatic hydrocarbon solvent) / cyclohexanone=1 / 1 (mass ratio)) mixing. Then, pigment dispersion is performed until the particles (particle diameter of pigment coarse particles) become 20 μm or less. Thereafter, 13.3 parts (solid content: 10 parts) of Desmodur BL 3175 (manufactured by Sumika Bayer ...

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PUM

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Abstract

Disclosed is a zinc-plated steel sheet having a coating film formed thereon, in which a multi-layered coating film composed of a non-chromium coating composition is formed on both the front surface and the rear surface thereof, and which has excellent corrosion resistance in a flat area and excellent resistance to white rust in a processed part and an edge part (which is highly visible particularly in the initial stage in use). Specifically disclosed is a zinc-plated steel sheet having a coating film formed thereon, in which a multi-layered coating film is formed on the front surface thereof and a one-layered or multi-layered coating film is formed on the rear surface thereof. In the steel sheet, a coating film composed of a coating composition that comprises a hydroxy-group-containing coating-film-forming resin and contains a predetermined amount of an anti-corrosion pigment is formed on the lowermost layer of at least one of the front and rear surfaces thereof, and a coating film composed of a coating composition that contains a predetermined amount of a silicic acid ion of a metal silicate salt and a metal ion exchange silica, a phosphoric acid group and / or a phosphate salt group of a phosphoric-acid-group-containing coating-film-forming resin and / or a phosphate-salt-group-containing coating-film-forming resin, and / or an azole compound is formed on the uppermost layer of at least one of the front and rear surfaces.

Description

technical field [0001] The present invention relates to a coated-film-formed galvanized steel sheet in which a multi-layered coating film composed of a non-chromium-based coating composition is formed on both the front and rear surfaces and which has excellent corrosion resistance. More specifically, the present invention particularly relates to a coated galvanized steel sheet having excellent white rust resistance at processed portions and end portions. Background technique [0002] Galvanized steel sheets on which a coating film is formed, such as precoated steel sheets coated by coil coating etc., have been widely used as housing-related items such as roofs of buildings, walls, building materials such as shutters and garages, various home appliances , switchboards, freezers, steel furniture and kitchen equipment. [0003] In the process of producing these housing-related articles from the coated-film-formed galvanized steel sheet, the coated-film-formed galvanized steel ...

Claims

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Application Information

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IPC IPC(8): B32B27/18B05D7/14B32B15/08C09D5/08C09D163/00C09D167/00C23C2/06
CPCC23C2/26C09D5/082C23C28/00C09D163/00
Inventor 松田英树林真弘三好裕也村田理章
Owner KANSAI PAINT CO LTD
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