JP2006082416A - Clear, coated stainless steel sheet preventing fingerprint from being distinguished and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clear, coated stainless steel sheet preventing an adherent fingerprint from being distinguished. <P>SOLUTION: In the clear, coated stainless steel sheet, the contact angle with water of the surface of the clear coating film is 60° or below. In a method for producing the stainless steel sheet, a coating for forming a clear coating film in which 0.5-50 pts. wt. of the partial hydrolysis condensation product of a tetraalkoxy silane is incorporated in relation to 100 pts. wt. of a base resin is applied to form a dry coating film of 0.5-20 μm in thickness and heated at an ambient temperature of 150-300°C for 20-120 s. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、付着する指紋が目立たないクリア塗装ステンレス鋼板およびその製造方法に関する。   The present invention relates to a clear-coated stainless steel plate and a method for manufacturing the same, in which an attached fingerprint is inconspicuous.

ステンレス鋼板は、清潔感、高級感を有することから家電機器、器物の筐体や内装材等に使用されている。ステンレス鋼板無垢では、付着した指紋を拭き取り難く、ステンレス鋼板の素材を活かしたクリア塗装ステンレス鋼板が多用されてきている。   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.

クリア塗装ステンレス鋼板は、意匠性に優れることからキッチン家電機器、ＡＶ−ＩＴ機器などの多くの部材に使用されており、指紋が付着しても容易に拭き取れ、初期の意匠を長期間保持することができる。しかし、美麗な外観を有するために、付着した指紋が目立ち易いという欠点もある。とくに塗装原板が高光沢なＢＡ焼鈍仕上げ材の場合、付着した指紋が視認しやすい傾向にある。また、特開平９−８５８８０号公報には、ステンレス鋼板にリン酸とシリカからなる化成処理皮膜を形成し、その上に水酸基を有するアクリル-シロキサン複合樹脂と硬化剤および有機系潤滑付与剤を配合した塗料によるクリア塗装ステンレス鋼板が開示されている。しかし、この塗料は、硬化剤により経時的に反応し、調合した後、長く保存できない。
特開平９−８５８８０号公報 Clear coated stainless steel sheet is used in many components such as kitchen appliances and AV-IT devices because of its excellent design. It can be easily wiped off even when fingerprints are attached and retains the initial design for a long period of time. Can do. However, since it has a beautiful appearance, it has a drawback that the attached fingerprint is easily noticeable. In particular, when the coating original plate is a high-gloss BA annealed finish, the attached fingerprint tends to be easily visible. Japanese Patent Laid-Open No. 9-85880 discloses that a chemical conversion treatment film made of phosphoric acid and silica is formed on a stainless steel plate, and an acrylic-siloxane composite resin having a hydroxyl group, a curing agent, and an organic lubricant imparting agent are blended thereon. A clear-coated stainless steel sheet with a finished paint is disclosed. However, this paint reacts over time with a curing agent and cannot be stored for a long time after being formulated.
JP-A-9-85880

本発明は、このような問題を解決すべく案出されたものであり、付着した指紋が目立たないクリア塗装ステンレス鋼板を提供することを目的とする。その目的を達成するため、クリア塗膜表面の対水接触角が６０度以下であることを特徴とする指紋が目立たないクリア塗装ステンレス鋼板とした。その製造方法として、テトラアルコキシシランの部分加水分解縮合物をベース樹脂１００重量部に対して０．５〜５０重量部配合したクリア塗膜形成用の塗料を乾燥膜厚で０．５〜２０μｍになるように塗布し、１５０℃〜３００℃の雰囲気温度で２０〜１２０秒間加熱するようにした。テトラアルコキシシランの部分加水分解縮合物を配合することにより、調合塗料の貯蔵安定性もよい。   The present invention has been devised to solve such problems, and an object of the present invention is to provide a clear-coated stainless steel sheet in which attached fingerprints are not noticeable. In order to achieve the object, a clear-coated stainless steel plate with no noticeable fingerprint, characterized in that the water contact angle on the surface of the clear coating film is 60 degrees or less. As a manufacturing method thereof, a coating film for forming a clear coating obtained by blending 0.5 to 50 parts by weight of a partially hydrolyzed condensate of tetraalkoxysilane with respect to 100 parts by weight of the base resin has a dry film thickness of 0.5 to 20 μm. It applied so that it might become, and it was made to heat for 20 to 120 second by the atmospheric temperature of 150 to 300 degreeC. By blending a partially hydrolyzed condensate of tetraalkoxysilane, the storage stability of the formulated paint is good.

クリア塗膜表面への指紋付着は指紋成分の物理的な付着であり、クリア塗膜の樹脂種に依存せず、いずれも指紋が付着する。ただし、指紋の目立ち易さはクリア塗膜表面に依存し、具体的には指紋成分の大部分を為す水分との馴染み易さが影響する。すなわち、水に馴染み易い所謂対水接触角が小さい場合、指紋は塗膜表面に濡れ拡がるので指紋の輪郭が不鮮明となり目立たなくなる。使用されるクリア塗膜形成用塗料も貯蔵安定性に優れ、調合後、時間が経過しても再度適用できる。     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, when the so-called contact angle with water, which is easy to become familiar with water, is small, the fingerprint spreads on the surface of the coating film, so the outline of the fingerprint becomes unclear and becomes inconspicuous. The clear coating film-forming paint used is also excellent in storage stability, and can be reapplied even if time elapses after blending.

本発明の指紋が目立たないクリア塗装ステンレス鋼板は、クリア塗膜表面の対水接触角が６０度以下である。クリア塗膜表面の対水接触角が６０度以下を保つには、テトラアルコキシシランの部分加水分解縮合物をベース樹脂１００重量部に対して０．５〜５０重量部配合したクリア塗膜形成用の塗料を調合し、乾燥膜厚で０．５〜２０μｍになるように塗布し、１５０℃〜３００℃の雰囲気温度で２０〜１２０秒間加熱する。配合量や塗装条件は、ベース樹脂種によりそれぞれ適正な範囲で塗装すればよい。   The clear-coated stainless steel sheet of the present invention in which the fingerprint is not noticeable has a water contact angle of 60 degrees or less on the surface of the clear coating film. In order to maintain the water contact angle of the clear coating surface to 60 degrees or less, for forming a clear coating film containing 0.5 to 50 parts by weight of a partially hydrolyzed condensate of tetraalkoxysilane based on 100 parts by weight of the base resin The coating composition is prepared, applied to a dry film thickness of 0.5 to 20 μm, and heated at an ambient temperature of 150 to 300 ° C. for 20 to 120 seconds. What is necessary is just to paint the compounding quantity and the coating conditions in an appropriate range depending on the base resin type.

本発明で使用されるベース樹脂は、とくに限定されるものではないが、ポリエステル樹脂、線状高分子ポリエステル樹脂、アクリル樹脂、エポキシ樹脂、ウレタン樹脂、ポリフッ化ビニリデン樹脂／アクリル樹脂、フェノキシ樹脂、フェノール樹脂などの一般的なプレコート鋼板用に使用されるものが好ましい。なお、クリア塗膜の透明性を損なわない範囲で塗料中に着色顔料、メタリック顔料、パール顔料や種々の添加剤を配合してもよい。また、必要に応じてクリアプライマー塗膜を設けることができる。クリアプライマー塗膜のベース樹脂も前記のとおりとくに限定されず、顔料や添加剤の配合可否についても前記の条件と同様である。   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 What is used for general precoat steel plates, such as resin, is preferable. 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.

クリア塗膜形成用の塗料に配合するテトラアルコキシシランの部分加水分解縮合物は、テトラメトキシシラン、テトラエトキシシラン、テトラプロポキシシランなどのモノマーに水および触媒を加えて加水分解縮合させることにより得られる。なお、メチルシリケート５１、エチルシリケート４０、エチルシリケート４８（以上、コルコート社製）や、ＭＫＣシリケートＭＳ５１、ＭＳ５６（以上、三菱化学社製）などの市販品も適用できる。   The partial hydrolysis-condensation product of tetraalkoxysilane to be blended in the paint for forming a clear coating film is obtained by adding water and a catalyst to monomers such as tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, etc. . Commercially available products such as methyl silicate 51, ethyl silicate 40, ethyl silicate 48 (above, manufactured by Colcoat Co.), MKC silicate MS51, MS56 (above, manufactured by Mitsubishi Chemical Corporation) can also be applied.

テトラアルコキシシランの部分加水分解縮合物は、ベース樹脂１００重量部に対して０．５〜５０重量部の割合で配合される。配合量が０．５重量部に満たないと、十分な親水性を塗膜表面に付与することができない。逆に配合量が５０重量部を越えると、塗膜の加工性が低下し、塗膜割れを発生する虞がある。テトラアルコキシシランの部分加水分解縮合物を配合した塗料は、ベース樹脂や添加剤と経時的に反応しゲル化するため、使用直前にテトラアルコキシシランの部分加水分解縮合物を配合する方がよい。なお、経時的な反応の少ない貯蔵安定性のよい塗料に改善するには、テトラアルコキシシランの部分加水分解縮合物のキレート誘導体を配合すればよい。   The partial hydrolysis-condensation product of tetraalkoxysilane is blended at a ratio of 0.5 to 50 parts by weight with respect to 100 parts by weight of the base resin. If the blending amount is less than 0.5 parts by weight, sufficient hydrophilicity cannot be imparted to the coating film surface. On the other hand, when the blending amount exceeds 50 parts by weight, the processability of the coating film is lowered and there is a possibility that the coating film is cracked. Since a coating containing a partially hydrolyzed condensate of tetraalkoxysilane reacts with the base resin and additives over time and gels, it is better to add a partially hydrolyzed condensate of tetraalkoxysilane immediately before use. In order to improve the coating stability with little reaction over time and a good storage stability, a chelate derivative of a partial hydrolysis-condensation product of tetraalkoxysilane may be added.

キレート化剤としては、アセチルアセトン等のβジケトン、アセト酢酸エチル等のβケト酸エステル、２、３−ブタンジオール、１、３−プロパンジオール、エチレングリコール、２−メチル−２、４−ペンタンジオール、ピナコール等の２価アルコール類、モノ−エタノールアミン、ジ−エタノールアミン、トリ−エタノールアミン、モノ−イソプロパノールアミン、ジ−イソプロパノールアミン、トリ−イソプロパノールアミン、Ｎ−メチルジエタノールアミン、Ｎ−エチルジエタノールアミン等のエタノールアミン類を単独または複数同時に使用できる。   As a chelating agent, β-diketone such as acetylacetone, β-keto acid ester such as ethyl acetoacetate, 2,3-butanediol, 1,3-propanediol, ethylene glycol, 2-methyl-2,4-pentanediol, Dihydric alcohols such as pinacol, ethanol such as mono-ethanolamine, di-ethanolamine, tri-ethanolamine, mono-isopropanolamine, di-isopropanolamine, tri-isopropanolamine, N-methyldiethanolamine, N-ethyldiethanolamine One or more amines can be used simultaneously.

キレート化剤の添加量は、とくに制約されるものではないが、テトラアルコキシシランの部分加水分解縮合物に含まれるＳｉ原子のモル数に対して０．１〜２．０当量の範囲で調整することが好ましい。   The amount of the chelating agent added is not particularly limited, but is adjusted in the range of 0.1 to 2.0 equivalents relative to the number of moles of Si atoms contained in the partial hydrolysis-condensation product of tetraalkoxysilane. It is preferable.

クリア塗膜形成用塗料の貯蔵安定性は、脱水剤の添加によりさらに向上する。脱水剤としては、オルト蟻酸トリメチル、オルト蟻酸トリエチル、オルト蟻酸トリブチル等のオルト蟻酸トリアルキル類、オルト酢酸トリメチル、オルト酢酸トリエチル、オルト酢酸トリブチル等のオルト酢酸トリアルキル類、オルト硼酸トリメチル、オルト硼酸トリエチル、オルト硼酸トリブチル等のオルト硼酸トリアルキル類、メチルトリメトキシシラン、γ−メタクリロキシプロピルトリメトキシシラン、ビニルトリメトキシシラン、テトラメトキシシラン、テトラエトキシシラン等の加水分解性シラン化合物が適用される。   The storage stability of the clear coating film-forming paint is further improved by the addition of a dehydrating agent. Examples of the dehydrating agent include trialkyl orthoformate such as trimethyl orthoformate, triethyl orthoformate and tributyl orthoformate, trialkyl orthoformate such as trimethyl orthoacetate, triethyl orthoacetate and tributyl orthoacetate, trimethyl orthoborate and triethyl orthoborate. Further, trialkyl orthoborate such as tributyl orthoborate, hydrolyzable silane compounds such as methyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, tetramethoxysilane, and tetraethoxysilane are applied.

本発明で用いるステンレス鋼板の鋼種は、とくに限定されず常法にしたがって適宜、研磨、脱脂、酸洗等を経てリン酸塩処理、クロメート処理、クロムフリー処理等の塗装前処理が施されたものを適用する。塗料の塗布もプレコート鋼板の製造で一般に採用されている塗装方法でよい。たとえば、ロールコート、カーテンコート、スプレーコート、ダイコート等がある。   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.

塗装焼付けは、ベース樹脂やステンレス鋼板の板厚、ラインスピード等を考慮し、１５０〜３００℃の雰囲気温度のオーブン等で２０〜１２０秒間の範囲で加熱乾燥する。クリア塗膜形成用塗料は、乾燥膜厚が０．５〜２０μｍになるようにステンレス鋼板表面に塗布する。乾燥膜厚が０．５μｍ未満では、均一なクリア塗膜として成膜できず、未被覆部に付着した指紋を容易に拭き取れなくなる。乾燥膜厚が２０μｍを越えても指紋の目立たないことに変わりはないものの、過剰品質になりコストメリットがなくなる。
予めクリアプライマー塗膜を形成する場合も同様の方法や条件で処理できる。 The coating baking is performed by heating and drying in an oven at 150 to 300 ° 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 0.5 to 20 μm. If the dry film thickness is less than 0.5 μm, it cannot be formed as a uniform clear coating film, and the fingerprint adhering to the uncoated portion cannot be easily wiped off. Even if the dry film thickness exceeds 20 μm, the fingerprint remains inconspicuous, but the quality becomes excessive and there is no cost merit.
When a clear primer coating is formed in advance, the same method and conditions can be used.

実施例１；
メチルシリケート５１（コルコート社製）１００重量部に、キレート化剤としてアセチルアセトン５０重量部を攪拌しながら添加し、常温で２時間攪拌した後、２４時間静置することによりキレート誘導体１を調製した。線状高分子ポリエステル樹脂系クリア塗料に、塗料樹脂１００重量部に対してメチルシリケート５１が１０重量部になるようにキレート誘導体１を配合してクリア塗膜形成用塗料を調合した。厚さ０．５ｍｍのＳＵＳ４３０ＨＬ仕上げステンレス鋼板に脱脂処理を施し、先に調合したクリア塗膜形成用塗料を乾燥膜厚で１０μｍになるように塗布し、オーブンにて２３０℃×６０秒間の加熱条件で焼付け乾燥し、直ちに水冷した。 Example 1;
50 parts by weight of acetylacetone as a chelating agent was added with stirring to 100 parts by weight of methyl silicate 51 (manufactured by Colcoat Co.), stirred at room temperature for 2 hours, and then allowed to stand for 24 hours to prepare chelate derivative 1. A clear coating film-forming paint was prepared by blending the linear polymer polyester resin-based clear paint with chelate derivative 1 so that methyl silicate 51 was 10 parts by weight with respect to 100 parts by weight of the paint resin. SUS430HL finished stainless steel plate with a thickness of 0.5 mm is degreased, and the previously prepared clear coating film-forming paint is applied to a dry film thickness of 10 μm and heated in an oven at 230 ° C. for 60 seconds. Baked and dried with water and immediately cooled with water.

得られたクリア塗装ステンレス鋼板は、美麗なクリア外観を呈し、指紋を付着しても目立たず、かつ、布で乾拭きすることにより容易に指紋を除去することができた。使用した塗料を４０℃の恒温槽で保管し、１ヶ月および３ヶ月経過する毎に塗料性状を確認したところ、ゲル化せず塗料粘度も初期と変わらず２００ｍＰａ・ｓ程度であった。合わせて前記同様の方法でクリア塗装ステンレス鋼板を作製し、塗装外観や指紋視認性を確認したところ、初期性能を維持していることが判った。   The clear-coated stainless steel plate obtained had a beautiful clear appearance, was not noticeable even when fingerprints were attached, and could easily be removed by wiping with a cloth. The used paint was stored in a constant temperature bath at 40 ° C., and the properties of the paint were confirmed every 1 month and 3 months. As a result, it did not gel and the viscosity of the paint was about 200 mPa · s. In addition, a clear-coated stainless steel plate was produced by the same method as described above, and the appearance of the coating and fingerprint visibility were confirmed. It was found that the initial performance was maintained.

実施例２；
メチルシリケート５１に替えてＭＫＣシリケートＭＣ５６（三菱化学社製）を使用すること以外は、実施例１と同様な方法でキレート誘導体２を調製した。線状高分子ポリエステル樹脂系クリア塗料に、塗料樹脂１００重量部に対してＭＫＣシリケートＭＳ５６が２０重量部になるようにキレート誘導体２を配合し、さらに、脱水剤としてオルト蟻酸トリメチルを５重量部配合してクリア塗膜形成用塗料を調合した。厚さ０．３ｍｍのＳＵＳ３０４ＢＡ鏡面仕上げステンレス鋼板に、Ｔｉ系クロムフリー塗装前処理を施し、赤色パール顔料を５重量％配合したエポキシ樹脂系クリア塗料を乾燥膜厚で５μｍになるように塗布し、オーブンで２１０℃×４５秒間の加熱条件で焼付け乾燥し、直ちに水冷した。次いで、その上面に先に調合したクリア塗膜形成用塗料を乾燥膜厚で８μｍになるように塗布し、オーブンにて２３０℃×６０秒間の加熱条件で焼付け乾燥し、直ちに水冷した。 Example 2;
A chelate derivative 2 was prepared in the same manner as in Example 1 except that MKC silicate MC56 (manufactured by Mitsubishi Chemical Corporation) was used instead of methyl silicate 51. The linear polymer polyester resin-based clear paint is mixed with chelate derivative 2 so that MKC silicate MS56 is 20 parts by weight with respect to 100 parts by weight of the paint resin, and further 5 parts by weight of trimethyl orthoformate as a dehydrating agent. Then, a paint for forming a clear coating film was prepared. SUS304BA mirror-finished stainless steel plate with a thickness of 0.3 mm was pre-treated with Ti-based chromium-free coating, and an epoxy resin-based clear paint containing 5% by weight of red pearl pigment was applied to a dry film thickness of 5 μm. It was baked and dried in an oven at 210 ° C. for 45 seconds and immediately cooled with water. Next, the clear coating film-forming paint prepared previously was applied to the upper surface so as to have a dry film thickness of 8 μm, baked and dried in an oven at 230 ° C. for 60 seconds, and immediately cooled with water.

得られたクリア塗装ステンレス鋼板は、美麗なクリア外観を呈し、指紋を付着しても目立たず、かつ、布で乾拭きすることにより容易に指紋を除去することができた。使用した塗料を４０℃の恒温槽で保管し、１ヶ月および３ヶ月経過する毎に塗料性状を確認したところ、ゲル化せず塗料粘度も初期と変わらず１８０ｍＰａ・ｓ程度であった。合わせて前記同様の方法でクリア塗装ステンレス鋼板を作製し、塗装外観や指紋視認性を確認したところ、初期性能を維持していることが判った。   The clear-coated stainless steel plate obtained had a beautiful clear appearance, was not noticeable even when fingerprints were attached, and could easily be removed by wiping with a cloth. The used coating material was stored in a constant temperature bath at 40 ° C., and the properties of the coating material were confirmed every 1 month and 3 months. As a result, it did not gel and the viscosity of the coating material was about 180 mPa · s. In addition, a clear-coated stainless steel plate was produced by the same method as described above, and the appearance of the coating and fingerprint visibility were confirmed. It was found that the initial performance was maintained.

実施例３；
キレート化剤として、アセチルアセトンに替えてジ−エタノールアミンを使用すること以外は、実施例２で使用したキレート誘導体２と同様な方法でキレート誘導体３を調製した。アクリル樹脂系クリア塗料に、塗料樹脂１００重量部に対してＭＫＣシリケートＭＳ５６が２０重量部になるようにキレート誘導体２を配合し、さらに、脱水剤としてオルト蟻酸トリエチルを５重量部配合してクリア塗膜形成用塗料を調合した。厚さ０．３ｍｍのＳＵＳ４３０ＢＡ鏡面仕上げステンレス鋼板に、Ｔｉ系クロムフリー塗装前処理を施し、エポキシ樹脂系クリア塗料を乾燥膜厚で５μｍになるように塗布し、オーブンで２１０℃×４５秒間の加熱条件で焼付け乾燥し、直ちに水冷した。次いで、その上面に先に調合したクリア塗膜形成用塗料を乾燥膜厚で１０μｍになるように塗布し、オーブンにて２３０℃×６０秒間の加熱条件で焼付け乾燥し、直ちに水冷した。 Example 3;
A chelate derivative 3 was prepared in the same manner as the chelate derivative 2 used in Example 2, except that di-ethanolamine was used instead of acetylacetone as the chelating agent. Clear coating by mixing chelate derivative 2 with acrylic resin-based clear paint so that MKC silicate MS56 is 20 parts by weight with respect to 100 parts by weight of paint resin, and further adding 5 parts by weight of triethyl orthoformate as a dehydrating agent. A film-forming paint was prepared. SUS430BA mirror-finished stainless steel plate with a thickness of 0.3 mm is pretreated with Ti-based chromium-free coating, and an epoxy resin-based clear paint is applied to a dry film thickness of 5 μm, and heated in an oven at 210 ° C. for 45 seconds. It was baked and dried under the conditions, and immediately cooled with water. Next, the clear coating film-forming paint prepared previously was applied to the upper surface so as to have a dry film thickness of 10 μm, baked and dried in an oven at 230 ° C. for 60 seconds, and immediately water-cooled.

得られたクリア塗装ステンレス鋼板は、美麗なクリア外観を呈し、指紋を付着しても目立たず、かつ、布で乾拭きすることにより容易に指紋を除去することができた。使用した塗料を４０℃の恒温槽で保管し、１ヶ月および３ヶ月経過する毎に塗料性状を確認したところ、ゲル化せず塗料粘度も初期と変わらず２３０ｍＰａ・ｓ程度であった。合わせて前記同様の方法でクリア塗装ステンレス鋼板を作製し、塗装外観や指紋視認性を確認したところ、初期性能を維持していることが判った。   The clear-coated stainless steel plate obtained had a beautiful clear appearance, was not noticeable even when fingerprints were attached, and could easily be removed by wiping with a cloth. The used paint was stored in a constant temperature bath at 40 ° C., and the properties of the paint were confirmed every 1 month and 3 months. As a result, it did not gel and the viscosity of the paint was about 230 mPa · s. In addition, a clear-coated stainless steel plate was produced by the same method as described above, and the appearance of the coating and fingerprint visibility were confirmed. It was found that the initial performance was maintained.

本発明によるクリア塗装ステンレス鋼板は、付着した指紋が目立たないのでメンテナンスフリーで恒久的に基材のもつ意匠性を保持でき、人が日常的に手を触れる部材、たとえばキッチン家電機器やＡＶ−ＩＴ機器などに最適である。また、クリア塗膜形成用塗料は、貯蔵安定性に優れるので調合した後、時間が経っても再利用でき経済的である。
The clear-coated stainless steel sheet according to the present invention can maintain the design of the base material permanently and maintenance-free because the attached fingerprint is inconspicuous, and is a member that can be touched on a daily basis, such as kitchen appliances and AV-IT Ideal for equipment. In addition, since the clear coating film-forming paint is excellent in storage stability, it can be reused over time after blending and is economical.

Claims (2)

クリア塗膜表面の対水接触角が６０度以下であることを特徴とする指紋が目立たないクリア塗装ステンレス鋼板。 A clear-coated stainless steel sheet with a conspicuous fingerprint, wherein the clear coating surface has a water contact angle of 60 degrees or less. テトラアルコキシシランの部分加水分解縮合物をベース樹脂１００重量部に対して０．５〜５０重量部配合したクリア塗膜形成用の塗料を乾燥膜厚で０．５〜２０μｍになるように塗布し、１５０℃〜３００℃の雰囲気温度で２０〜１２０秒間加熱することを特徴とする指紋が目立たないクリア塗装ステンレス鋼板の製造方法。


























A coating for forming a clear coating film containing 0.5 to 50 parts by weight of a partially hydrolyzed condensate of tetraalkoxysilane based on 100 parts by weight of the base resin is applied to a dry film thickness of 0.5 to 20 μm. A method for producing a clear-coated stainless steel sheet in which fingerprints are not noticeable, characterized by heating at an ambient temperature of 150 ° C. to 300 ° C. for 20 to 120 seconds.