JP2007069535A - Non-sticky clear coated stainless steel sheet with hardly visible fingerprint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clear coated stainless steel sheet with hardly visible adhering fingerprint. <P>SOLUTION: This clear coated stainless steel sheet has a coating containing one or not less than two selected from the group consisting of a silicone compound and a polyfluorocarbon chain-containing compound and not less than 0.2 μm centerline average surface roughness. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a non-adhesive clear-coated stainless steel plate in which an attached fingerprint is difficult to see.

  Stainless steel sheets are used in home appliances, housings and interior materials for their cleanliness and luxury. In the case of a solid stainless steel plate, it is difficult to wipe off the attached fingerprint, and a clear coated stainless steel plate using a stainless steel plate material has been frequently used.

Clear coated stainless steel sheet is used in many parts such as kitchen appliances and AV / IT equipment because of its excellent design. It can be easily wiped off even if fingerprints are attached and retains the initial design for a long time. Can do. In addition, non-adhesive clear-coated stainless steel plates that can easily remove oil are frequently used in kitchen members such as kitchen appliances and kitchen panels. For this reason, oil stains around the kitchen are easily cleaned. However, the non-adhesive clear coating film that easily repels oil also has a drawback that the attached fingerprint is easily noticeable. On the other hand, as a clear-coated stainless steel plate excellent in fingerprint removability, a clear coating film having an embossed appearance is provided immediately below the uppermost layer of a plurality of clear coating films (Patent Document 1). However, spray coating or flexographic printing is required to form a clear coating film with an embossed appearance.
JP 2004-160758 A

  The present invention has been devised to solve such problems, and an object of the present invention is to provide a non-adhesive clear-coated stainless steel sheet in which attached fingerprints are hardly visible. In order to achieve the object, the clear coating film contains one or more selected from a silicone compound and a polyfluorocarbon chain-containing compound, and the center line average surface roughness is 0.2 μm or more. A non-adhesive clear-coated stainless steel plate that makes it difficult to see the characteristic fingerprint.

    Fingerprint adhesion on the surface of the clear coating film is physical adhesion of the fingerprint component, and it does not depend on the resin type of the clear coating film, and in all cases, fingerprints adhere. However, the conspicuousness of the fingerprint depends on the surface of the clear coating, and specifically, the ease of familiarity with the water that makes up most of the fingerprint component affects. That is, fingerprints are easily noticeable in a clear coating film having a large contact angle with water, which is easy to adjust to water. On the other hand, seasonings such as oil and non-adhesive surfaces that are easy to remove food deposits are based on a small surface energy, in other words, a surface with a small surface tension and a large water contact angle, and the above-mentioned fingerprint is conspicuous. It can be said that the surface is easy. As for the conspicuousness of the fingerprint, the droplet edge between the clear coating film surface and the fingerprint component becomes a continuous line with high contrast, and an image called a fingerprint is formed. By interrupting this continuous line, the fingerprint as an image can be made inconspicuous. By providing irregularities on the surface of the clear coating film, the fingerprint component adheres to the convex portion, the fingerprint component does not adhere to the concave portion, the liquid droplet edge between the clear coating surface and the fingerprint component becomes an intermittent line, and the fingerprint is not noticeable. Become.

  The clear coated stainless steel sheet of the present invention in which the fingerprint is difficult to visually recognize is a clear coating film containing one or more selected from a silicone compound and a polyfluorocarbon chain-containing compound, and a center line average The surface roughness was 0.2 μm or more.

  The base resin used in the present invention is not particularly limited, but polyester resin, linear polymer polyester resin, acrylic resin, epoxy resin, urethane resin, polyvinylidene fluoride resin / acrylic resin, phenoxy resin, phenol Those used for general pre-coated steel sheets such as resin, acrylic silicone resin, and tetrafluoride resin are preferred. In addition, you may mix | blend a color pigment, a metallic pigment, a pearl pigment, and various additives in a coating material in the range which does not impair the transparency of a clear coating film. Moreover, a clear primer coating film can be provided as needed. The base resin of the clear primer coating is not particularly limited as described above, and whether or not a pigment or an additive can be blended is the same as that described above.

  Except when the clear coating film uses an acrylic silicone resin, a tetrafluoride resin, or the like as a base resin, one or more selected from a silicone compound and a polyfluorocarbon chain-containing compound are blended in the paint made of the base resin. The blending amount is not particularly limited, but is preferably 0.5 parts by weight or more with respect to 100 parts by weight of the base resin in order to develop non-adhesiveness. However, even if it exceeds 10 parts by weight, no non-adhesive improvement is observed and there is no cost merit.

  Examples of the silicone compound contained in the clear coating film according to the present invention include dimethylpolysiloxane, methylhydropolysiloxane, silicone oil or silicone varnish dissolved in a solvent. The polyfluorocarbon chain-containing compound may be either a polymer or a copolymer, and a fluororesin surfactant, a fluorinated oil, a polymer having a perfluoroalkyl group, a fluorosilicone oil, and the like are used.

  Polyfluorocarbon chain-containing compounds are Unidyne DS-101, DS-202, DS-301, DS-406, Demnum S-20, Daifuru # 20, Texgard TG-652, TG-664 (manufactured by Daikin Industries), FS -1265 (manufactured by Toray Dow Corning), X-22-819, FL-100 (manufactured by Shin-Etsu Chemical Co., Ltd.), and the like.

  In the present invention, the method for setting the centerline average roughness of the clear coating film to 0.2 μm or more is not particularly limited, and examples thereof include a method of blending a colorless pigment such as silica into the clear coating film. For example, although it depends on the average particle diameter of the colorless pigment, the coating film thickness, etc., by blending 2 to 20 parts by weight of silica having an average particle diameter of 5 μm with respect to 100 parts by weight of the resin, the center line average surface roughness Can be controlled to 0.2 μm or more.

  The steel type of the stainless steel plate used in the present invention is not particularly limited, and is subjected to coating pretreatment such as phosphate treatment, chromate treatment, and chromium-free treatment through polishing, degreasing, pickling, etc., according to conventional methods. Apply. The coating method may be a coating method generally employed in the production of precoated steel sheets. For example, there are roll coat, curtain coat, spray coat, die coat and the like.

  Paint baking is performed by heating and drying in an oven at 150 to 400 ° C. for 20 to 120 seconds in consideration of the thickness of the base resin and the stainless steel plate, the line speed, and the like. The clear coating film-forming paint is applied to the stainless steel plate surface so that the dry film thickness is 2 to 20 μm. When the dry film thickness is less than 2 μm, it is difficult to impart a center line average roughness of 0.2 μm or more to the clear coating film, and the liquid droplet edge between the clear coating film surface and the fingerprint component becomes a high-contrast continuous line. The image becomes noticeable. Even if the dry film thickness exceeds 20 μm, the fingerprint remains inconspicuous, but the quality becomes excessive and the cost advantage is lost. When a clear primer coating is formed in advance, the same method and conditions can be used.

Example 1;
A stainless steel plate with a thickness of 0.5 mm is degreased, and 2 parts by weight of Unidyne DS-101 made by Daikin Industries and 10 parts by weight of silica with an average particle size of 3 μm are blended with 100 parts by weight of the base resin. The linear polymer polyester resin-based clear paint thus applied was applied to a dry film thickness of 10 μm, baked and dried in an oven at 230 ° C. for 60 seconds, and immediately cooled with water. The centerline average surface roughness of the clear-coated stainless steel sheet was 0.6 μm.

Example 2;
It was produced under the same conditions as in Example 1 except that silicone oil was blended instead of Unidyne DS-101 manufactured by Daikin Industries. The centerline average surface roughness of the clear-coated stainless steel sheet was 0.5 μm.

Example 3;
SUS430 No. 0.4mm thick. 4. Finished stainless steel sheet is degreased, and an acrylic silicone resin-based clear paint containing 5 parts by weight of silica with an average particle size of 5 μm is applied to a dry film thickness of 8 μm and heated in an oven at 230 ° C. for 60 seconds. It was baked and dried under the conditions and immediately cooled with water. The centerline average surface roughness of the clear-coated stainless steel sheet was 0.9 μm.

Comparative Example 1;
It was produced under the same conditions as in Example 1 except that silica was not blended. The centerline average surface roughness of the clear-coated stainless steel plate was 0.05 μm.
Comparative Example 2;
It was produced under the same conditions as in Example 3 except that silica was not blended. The centerline average surface roughness of the clear-coated stainless steel plate was 0.09 μm.

  The obtained clear-coated stainless steel sheets all showed excellent non-adhesiveness, the red oil marker applied to the coating film surface was not repelled and a line could not be drawn, and the marker could be easily wiped with a cloth. Moreover, although the thing by an Example is hard to visually recognize even if a fingerprint is attached, the thing by a comparative example has confirmed the fingerprint clearly. In the comparative example, the fingerprint could be easily removed by wiping with a cloth.

The clear-coated stainless steel sheet according to the present invention is less noticeable with attached fingerprints and can maintain the design of the base material permanently without maintenance. Ideal for IT equipment.

Claims (1)

The fingerprint is characterized in that the clear coating contains one or more selected from silicone compounds and polyfluorocarbon chain-containing compounds, and the centerline average surface roughness is 0.2 μm or more. Difficult non-adhesive clear painted stainless steel sheet.