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Colored and coated chromate-free metal sheet, and colored aqueous composition

A chromate-free, metal plate technology, applied in the direction of metal layered products, coatings, synthetic resin layered products, etc., can solve the problems of insufficient adhesion, discoloration, coating film dissolution, etc., to achieve chemical resistance Excellent performance, reduced energy costs, and improved productivity

Active Publication Date: 2013-08-07
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this water-based surface treatment composition has insufficient adhesion to the base metal, and there are problems in that performance cannot be fully exhibited in terms of processability and chemical resistance.
[0011] In addition, in the case of using the design-coated steel plate disclosed in Patent Documents 7 and 8, which is coated with a surface treatment coating film, as a raw material for a rear cover of a flat-screen TV, the surface is wiped with an alcohol-containing detergent. When the surface of the back cover is stained, the coating film will dissolve, and there may be troubles such as discoloration

Method used

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  • Colored and coated chromate-free metal sheet, and colored aqueous composition
  • Colored and coated chromate-free metal sheet, and colored aqueous composition
  • Colored and coated chromate-free metal sheet, and colored aqueous composition

Examples

Experimental program
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Effect test

Embodiment

[0129] The present invention is further illustrated by examples. However, the present invention is not limited to the following examples.

[0130] (1) metal plate

[0131] Table 1 shows the types of metal plates used. A mild steel plate with a plate thickness of 0.5 mm was used as a base material of the plated metal plate. Regarding the SUS plate, a ferritic stainless steel plate (steel composition: C: 0.008 mass%, Si: 0.07 mass%, Mn: 0.15 mass%, P: 0.011 mass%, S: 0.009 mass%, Al: 0.067 mass%, Cr: 17.3% by mass, Mo: 1.51% by mass, N: 0.0051% by mass, Ti: 0.22% by mass, the balance being Fe and unavoidable impurities). Alkaline degreasing treatment on the surface of the metal plate, washing and drying before use.

[0132] Table 1

[0133] No.

Metal plate (thickness 0.5mm, double-sided plating)

M1

Electro-galvanized steel sheet (coating weight 20g / m 2 )

M2

Hot-dip galvanized steel sheet (coating weight 60g / m 2 )

M3

Alloyed ...

manufacture example PO1

[0147]

[0148] Nitrogen gas was introduced into a reaction vessel equipped with a thermometer, a nitrogen introduction pipe, and a stirrer, and 443 parts by mass of terephthalic acid, 443 parts by mass of isophthalic acid, 420 parts by mass of adipic acid, 196 parts by mass of ethylene glycol, and 1 , 306 parts by mass of 4-butanediol, 328 parts by mass of neopentyl glycol, and 0.5 parts by mass of dibutyltin oxide were stirred. Next, while introducing nitrogen gas, the temperature was raised to 230° C., and polycondensation reaction was performed at this temperature for 15 hours until the acid value became 1 or less to obtain polyester polyol PO1.

manufacture example PO2

[0149]

[0150] According to the raw material composition shown in Table 6, polyester polyols PO2-PO7 were obtained by the procedure similar to manufacture example PO1. In either preparation, the amount of dibutyltin oxide is 0.5 parts by mass.

[0151] Table 6 also shows the number average molecular weight (polystyrene conversion value measured by GPC) of polyester polyols PO1 to PO7 and the content of aromatic ring structures in the solid content of polyester polyols PO1 to PO7 (mass % ). It should be noted that the content of the aromatic ring structure in the solid content of these polyester polyols PO1 to PO7 is obtained by substituting the denominator {solid content mass (g) of polyurethane resin (A1)} in the above formula [1] Calculated as {solid content mass (g) of polyester polyol}.

[0152] Table 6

[0153]

[0154] (Preparation of aqueous dispersion of polyurethane resin)

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Abstract

The present invention provides a colored and coated chromate-free metal sheet which has, formed on at least one surface of a metal sheet, a colored coating film (alpha) that comprises a film-forming component comprising a polyurethane resin (A1) containing a urea group, a urethane group and a carboxyl group, a coloring pigment (B) and spherical silica particles (C) having an average particle diameter of 5-50 nm, wherein the polyurethane resin (A1) contains structural units each derived from a polyester polyol component (a) having an aromatic ring structure and structural units each derived from an isocyanate component (b) having an aromatic ring structure, each of the structural units derived from the isocyanate component (b) contains an aromatic ring structure, and the colored coating film (alpha) has a thickness of 2-10 mum, and wherein the metal sheet has excellent chemical resistance.

Description

technical field [0001] The present invention relates to forming a colored coating film that does not contain hexavalent chromium with a high environmental load on at least one surface of a metal plate and has design properties (colorability and hiding properties including processed parts), moisture resistance, corrosion resistance, Inexpensive chromate-free color-coated metal sheet that is extremely excellent in workability, scratch resistance, and chemical resistance. [0002] This application claims priority based on Japanese Patent Application No. 2010-268184 for which it applied in Japan on December 1, 2010, and uses the content here. Background technique [0003] For home appliances, building materials, automobiles, etc., precoated steel sheets coated with a colored organic film are used instead of conventional post-coated products that are painted after forming. Since such a precoated steel sheet is coated with a colored organic film on an antirust-treated steel sheet...

Claims

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Application Information

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IPC IPC(8): B32B15/095B32B27/40C08K3/00C08K3/36C08L67/00C08L75/06C09D175/06
CPCC08G18/6659C08G18/4216
Inventor 森下敦司林公隆布田雅裕和田裕介佐藤梨惠
Owner NIPPON STEEL CORP
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