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Surface treated metal board

A surface treatment and metal plate technology, which is applied in the direction of metal layered products, metal material coating technology, and the device for coating liquid on the surface, can solve the problems of poor corrosion resistance and improve corrosion resistance and conductivity Excellent, excellent alkali resistance and degreasing effect

Active Publication Date: 2006-03-08
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As a resin system suitable for the above-mentioned organic resin film, urethane resin has its excellent hardness and elongation, so it is partially used, but urethane resin has many polar groups, so compared with other resin systems, there are Corrosion resistance is mostly poor such a problem

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0074] (5) Preparation method of resin aqueous solution and formation method of resin film

[0075] The aqueous resin liquid used in the present invention may contain diluting solvents, anti-skinning agents, leveling agents, defoamers, penetrating agents, emulsifiers, film-forming aids, coloring pigments, Thickeners and lubricants etc. The preparation method of the above-mentioned resin aqueous liquid is not particularly limited, and the above-mentioned carboxyl-containing polyurethane aqueous liquid, ethylene-unsaturated carboxylic acid copolymer aqueous dispersion, silica particles, silane coupling agent, and Necessary, wax, cross-linking agent etc. are obtained above-mentioned resin water-based liquid. Silica particles, silane coupling agent, wax, crosslinking agent, etc. can be added at any stage, but it is desirable not to heat in order to prevent crosslinking reaction and gelation after adding the crosslinking agent and silane coupling agent.

[0076] In order to form ...

Embodiment

[0081] [Evaluation method]

[0082] (1) Corrosion resistance

[0083] The obtained surface-treated metal sheet (resin-coated steel sheet) was subjected to a salt spray test on an edge-sealed flat sheet in accordance with JIS-Z2371, and the time until 1% of white rust occurred was evaluated.

[0084] (evaluation criteria)

[0085] ◎: white rust occurred greater than or equal to 240 hours

[0086] ○: White rust occurs more than or equal to 120 hours to less than 240 hours

[0087] △: White rust occurred greater than or equal to 72 hours to less than 120 hours

[0088] ×: White rust occurred in less than 72 hours

[0089] (2) Abrasion resistance

[0090] The obtained surface-treated metal sheet (resin-coated steel sheet) was subjected to a vibration test in accordance with the Packaging-Vibration Test (JIS-Z0232) standard, and the appearance of the test material after a predetermined time was evaluated based on the following criteria. As a vibration test device, a product n...

experiment example 1

[0123] The carboxyl group-containing polyurethane resin aqueous solution obtained above, the above-mentioned ethylene-acrylic acid copolymer aqueous dispersion, and silica particles (Nissan Chemical Snow-Tex XS, average particle diameter: 4 to 6 nm) were added to 100 in terms of non-volatile components. Parts by mass were blended to achieve the blending ratio shown in Table 1. With respect to the total of 100 parts by mass, 15 parts by mass of γ-glycidoxypropyltrimethoxysilane (KBM403 manufactured by Shin-Etsu Chemical Co., Ltd.) was further added as a silane coupling agent, Made into resin water-based liquid.

[0124]Use a roller to coat the resin aqueous solution on the surface of the electroplated pure zinc steel plate, heat and dry it at a plate temperature of 90°C, and obtain an adhesion amount of 0.4g / m 2 Resin-coated metal sheets (resin-coated steel sheets). Table 1 shows the evaluation results of the obtained resin-coated steel sheets in terms of corrosion resistance,...

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Abstract

The surface-treated metal sheet according to the present invention is a surface-treated metal sheet with a resin film prepared with an aqueous resin solution, characterized in that the aqueous resin solution contains an aqueous carboxyl group-containing polyurethane resin solution and an aqueous ethylene-unsaturated carboxylic acid copolymer dispersion in an amount of 5 to 45 parts by mass as nonvolatile resin components, and silica particles having an average particle size of 4 to 20 nm in an amount of 55 to 95 parts by mass, in the total amount of 100 parts by mass, and additionally a silane-coupling agent in an amount of 5 to 25 parts by mass with respect to the total amount of 100 parts by mass, a compounding ratio of the nonvolatile resin component in the aqueous polyurethane resin solution (PU) to the nonvolatile resin component in the aqueous ethylene-unsaturated carboxylic acid copolymer dispersion (EC) (PU:EC) being 9:1 to 2:1. The surface-treated metal sheet according to the present invention is superior in corrosion resistance, coating property (film adhesiveness), abrasion resistance, alkaline degreasing resistance, and conductivity.

Description

technical field [0001] The present invention relates to surface-treated metal sheets, and more specifically, to corrosion resistance, corrosion resistance, paintability (coating film adhesion), electrical conductivity, and alkali resistance used in automobiles, home appliances, and building materials. Surface-treated metal sheet with excellent degreasing properties. Background technique [0002] As materials used in automobiles, home appliances, and building materials, galvanized steel sheets such as electro-galvanized steel sheets and hot-dip galvanized steel sheets are often used, or for the purpose of further improving corrosion resistance and paintability, on the galvanized steel sheets Inorganic surface-treated steel sheet subjected to chemical conversion treatment such as chromate treatment or phosphate treatment. In addition, resin-coated steel sheets in which an organic resin film is formed on a chromate-treated surface-treated steel sheet have been proposed for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/14
CPCB32B15/095C08G18/28C08G18/70C09D7/63C09D123/0869C09D175/04C23C26/00
Inventor 中元忠繁栗田一宏贵答丰山本佳代
Owner KOBE STEEL LTD
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