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black painted sheet metal

A metal sheet and coating technology, applied in metal layered products, metal material coating processes, devices for coating liquids on surfaces, etc. problem, to achieve the effect of excellent durability

Inactive Publication Date: 2018-04-06
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the other hand, in actual manufacture, because the black film is too thin, there will be defects in the coating film caused by uneven coating or dust-like pits in the production line, which will easily cause poor appearance and sometimes damage the product. Appearance of painted steel sheets
In particular, in Patent Document 4, properties such as corrosion resistance and scratch resistance are exhibited by providing a transparent film on a black film. There is a tendency to become more conspicuous of coating film defects caused by

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] (Manufacturing of substrate-treated metal plates)

[0132] First, 26.3 parts by mass of acidic colloidal silica ("SNOWTEX (registered trademark) O" manufactured by Nissan Chemical Industry Co., Ltd.; solid content concentration 20%) and aluminum dihydrogen phosphate (Yoneyama Chemical Co., Ltd.) were added to about 952 parts by mass of pure water. manufactured; solid content concentration 50%) 19.5 parts by mass, polyacrylic acid ("JURYMER (registered trademark) AC-10-LP" manufactured by Nippon Junyaku Co., Ltd.; solid content 100%) 0.075 parts by mass was added thereto, and silane di 113 parts by mass of a coupling agent ("KBM403" manufactured by Shin-Etsu Chemical Co., Ltd.; solid content 100%) was used to prepare a base treatment composition solution (solid content concentration: 1.7%).

[0133] Next, using a manual roller coating device, the resulting base treatment composition solution is coated on an electrogalvanized steel sheet (EG; Zn adhesion amount 20g / m 2 )...

Embodiment 2

[0155] [Example 2, Comparative Example 2]

[0156] (Formation of the first black layer)

[0157]

[0158] As a matrix resin, a water-dispersible polyester resin (VYLONAL (registered trademark) MD-1200 manufactured by Toyobo Co., Ltd., 34% solid content concentration) of Tg67°C and Mn15,000 was prepared in terms of solid content of 69 to 81 parts by mass. 4 to 16 parts by mass of surface-treated carbon black were added to the water-dispersed polyester resin so that the mass ratio of "Super Thick Ink Drop BA-8" to "SA BLACK DY-6" was 2:8. Next, 15 parts by mass of colloidal silica (SNOWTEX (registered trademark) XS manufactured by Nissan Chemical Industry Co., Ltd., solid content 100%) was added to make the water-dispersed polyester resin (solid content) and surface-treated carbon black (solid content) and the total amount of colloidal silicon dioxide is 100 parts by mass. Further add 15 parts by mass of silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd. "KB...

Embodiment 3

[0166] [Example 3, Comparative Example 3]

[0167] (Formation of the first black layer)

[0168]

[0169] As the matrix resin, 75 parts by mass of Tg67° C., Mn15,000 water-dispersed polyester resin (VYLONAL (registered trademark) MD-1200 manufactured by Toyobo Co., Ltd., 34% solid content concentration) in terms of solid content was prepared, and other The water-based black resin composition was prepared in the same manner as in Example 1.

[0170]

[0171] The water-based black resin composition obtained above was coated on the surface of the above-mentioned base-treated metal plate using a bar coating device so that the dry film thickness was 1.2 μm, and then dried at 160° C. for 60 seconds to form the first A black layer.

[0172] (Formation of the second black layer)

[0173] Using a bar coating device, the surface of the above-mentioned first black layer is coated in a manner to reach the dry thickness shown in Table 4, except that a second black layer is formed in...

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Abstract

The present invention provides a black painted metal sheet having a sufficiently thin total coating film, exhibiting good blackness, no defective appearance, and excellent durability. The black coated metal plate of the present invention is characterized in that: a first black layer with a film thickness of 0.8 to 1.6 μm formed from a water-based black resin composition based on a water-dispersed polyester resin is laminated on at least one side of the metal plate, A second black layer having a film thickness of 5 to 9 μm formed of a solvent-based black paint is laminated on the first black layer, wherein the water-based black resin composition contains surface-treated carbon black whose surface is coated with a water-based resin.

Description

technical field [0001] The present invention relates to black painted metal sheets with good blackness. Background technique [0002] In the past, black plastic was used as the back cover of thin TVs such as LCD TVs and plasma TVs, but in recent years, from the viewpoint of imparting conductivity to the inner surface (response to electromagnetic waves), etc., black coatings have been used as alternatives. Painted steel sheet (PCM: Prepainted Metal). [0003] In conventional painted steel sheets (PCM), the coating contains black pigments such as carbon black in order to hide the appearance and gloss of the original sheet (electro-galvanized steel sheet, hot-dip galvanized steel sheet, alloyed hot-dip galvanized steel sheet, etc.) paint, so that the film thickness reaches about 10μm (adhesion: about 12g / m 2 ), and then according to the need, under the black coating layer (top coat layer), at about 3 μm (adhesion: about 5g / m 2 ) is used to set the film thickness of the under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/08B05D7/14B05D7/24B32B15/09C09D5/02C09D7/62C09D7/65C09D7/63C09D7/61C09D167/00C23C26/00C09D5/08
CPCB32B15/08C09D5/02B32B27/20B32B2255/26B32B2264/102B32B2457/00B32B2255/062C08K3/04C09D7/61C08K3/013B32B15/09B32B27/36
Inventor 中元忠繁江口彻山本佳代
Owner KOBE STEEL LTD
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