JP3429292B2 - Clear coated stainless steel plate with excellent transparency - Google Patents
Clear coated stainless steel plate with excellent transparencyInfo
- Publication number
- JP3429292B2 JP3429292B2 JP2001352879A JP2001352879A JP3429292B2 JP 3429292 B2 JP3429292 B2 JP 3429292B2 JP 2001352879 A JP2001352879 A JP 2001352879A JP 2001352879 A JP2001352879 A JP 2001352879A JP 3429292 B2 JP3429292 B2 JP 3429292B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- clear
- coating film
- turbidity
- clear coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Paints Or Removers (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、家電機器の筐体，内装
材等として好適なクリア塗装ステンレス鋼板に関する。
【０００２】
【従来技術及び問題点】家電機器の筐体や内装材には、
めっき鋼板に着色エナメル塗料を塗装したプレコート鋼
板が従来から一般的に使用されている。嗜好の多様化が
進む傾向にある最近では、ステンレス鋼素地の金属光沢
を活かした高級感のある外観を呈する筐体や内装材に対
する要求もあり、ステンレス鋼板の上にクリア塗膜を設
けたクリア塗装ステンレス鋼板も使用され始めている。
クリア塗装ステンレス鋼板用には、ポリエステル樹脂，
アクリル樹脂，シーリコンポリエステル樹脂，アクリル
シリコーン樹脂，フッ素樹脂等のクリア塗料が使用され
ている。塗装前処理したステンレス鋼板にクリア塗料を
塗布し、１コート１ベーク又は２コート２ベークでクリ
ア塗膜が形成される。
【０００３】クリア塗料には、ステンレス鋼素地の金属
光沢を活かすため透明性の高い樹脂を主成分にすること
が望まれる。なかでも、ステンレス鋼素地の金属光沢が
最も高いＢＡ（光輝焼鈍）仕上げ原板では高級感のある
外観が得られるものの、反射光量も高いので、他の仕上
げ材に比較して透明性の低下，濁り，曇り等の外観劣化
が目立ちやすい。濁りは、クリア塗膜を斜め方向から観
察したときに際立って認識される。
【０００４】
【課題を解決するための手段】本発明は、このような問
題を解消すべく案出されたものであり、クリア塗膜の鏡
面光沢を規制することにより、濁りを抑えて透明性を高
めた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。本発明のクリア塗装ステンレス鋼板は、その目的
を達成するため、鋼板表面に、ベンゼン環を含まない樹
脂塗料から形成され、屈折率が１．４０以上で，膜厚２
０μｍのときの可視光透過率が６０％以上であるクリア
塗膜を有し、６０度での鏡面光沢が４００以上であるこ
とを特徴とする。
【０００５】
【作用】本発明者等は、クリア塗装ステンレス鋼板の表
面を観察し、透明性，濁り，曇りの有無に及ぼす塗膜性
状を種々調査した。その結果、クリア塗装ステンレス鋼
板の６０度での鏡面光沢を４００以上にすると、濁りや
曇りの発生を抑えて透明度，金属光沢が改善され、高級
感のある外観が得られることを見出した。６０度での鏡
面光沢は、JIS K5600に規定されている測定法によって
求めることができる。鏡面光沢が濁りの発生に及ぼす影
響は、次のように推察される。濁りは塗膜表面の微細な
凹凸により光が拡散反射することにより生じる。この
点、塗膜表面の凹凸が少なく正反射光量が十分大きけれ
ば金属光沢が得られ、拡散反射により正反射光量が低減
すると濁りが現れる。そこで、表面の微細な凹凸に起因
する拡散反射を抑え、クリア塗装ステンレス鋼板の６０
度での鏡面光沢を４００以上にすることにより、濁りが
なく透明度の高い金属光沢を発現させる。鏡面光沢は塗
膜のレベリング性，膜厚，塗装原板の表面粗さ等によっ
て調整でき、レベリング性が高く，膜厚が厚く，塗装原
板の表面粗さが低いほど鏡面光沢が高くなる。
【０００６】クリア塗膜を光が透過する際、可視光域を
含む近紫外域での吸収が生じると、可視光透過率が低下
して濁りが生じる。可視光域を含む近紫外域での吸収
は、ベンゼン環自体の共役二重結合やベンゼン環近傍の
二重結合とベンゼン環が共役した結合に由来する。透過
光の吸収をもたらす共役結合は、分子構造にベンゼン環
をもつ樹脂塗膜を焼付け硬化したとき、或いは使用環境
に長時間放置したときに生じる。他方、ベンゼン環を含
まない樹脂塗料を使用すると、膜厚２０μｍのときの可
視光透過率が６０％以上になり、濁りや曇りがなく透明
度の高いクリア塗膜が形成される。なお、膜厚２０μｍ
のときの可視光透過率は、分光光度計を用い膜厚２０μ
ｍのクリア塗膜を透過する波長３８０〜７８０ｎｍの透
過光を測定し、測定光量を積分することによって求めら
れる。
【０００７】濁りの有無は、クリア塗膜内における透過
光の光路長によっても影響される。すなわち、クリア塗
膜に斜め方向から入射した透過光は、クリア塗膜内の光
路長が長くなるほどクリア塗膜に吸収される割合が多く
なり、結果として濁りが増加する。光路長による濁りの
増加は、クリア塗膜の屈折率を高めることにより抑制で
きる。クリア塗膜に大気中から入射した光は空気／塗膜
の界面で屈折するが、このときの屈折角はクリア塗膜の
屈折率に応じて大きくなる。大きな屈折角はステンレス
鋼基板に対して直角に近い方向に透過光が屈折すること
を意味し、結果として屈折率が高いほど透過光の光路長
が短くなる。したがって、クリア塗膜に吸収される成分
が少なくなり、クリア塗膜の濁りも抑えられる。
【０００８】屈折率による濁り抑制効果は１.４０以上
の屈折率で顕著になり、膜厚２０μｍのときの可視光透
過率が６０％以上であるときに実現される。なお、屈折
率は、２０℃の雰囲気中で遊離クリア塗膜をナトリウム
Ｄ光源で照射し、遊離クリア塗料に入射した光を多波長
アッベ屈折計で測定することより求められる。遊離クリ
ア塗膜は、ＥＴＦＥラミネート鋼板にクリア塗料を塗布
し、焼付け硬化した後でＥＴＦＥラミネート鋼板から剥
離することにより作製できる。屈折率１.４０以上で，
膜厚２０μｍのときの可視光透過率６０％以上のクリア
塗膜を有し、６０度での鏡面光沢を４００以上にしたク
リア塗装ステンレス鋼板は、透明性が高いことからステ
ンレス鋼素地の金属光沢を活かすことができる。高い透
明性は、顔料，染料，メタリック顔料，パール顔料を配
合したクリア塗膜にあっては、より鮮やかに顔料に色調
を反映し意匠性に優れた外観をクリア塗装ステンレス鋼
板に付与する。
【０００９】
【実施の形態】クリア塗膜が形成される塗装原板には、
鋼種や仕上げ方法の如何を問わず各種ステンレス鋼板が
使用される。なかでも、ＢＡ仕上げしたステンレス鋼板
を使用すると、クリア塗膜の透明性が活用され、美麗な
外観を呈する筐体，内装材，表装材等に使用される。ス
テンレス鋼板は，塗膜の密着性を高めるため必要に応じ
て種々の塗装前処理が施される。塗装前処理には、脱
脂，クロメート処理，リン酸塩処理，タンニン酸処理，
非クロム処理（シリカ系，ジルコニア系，チタン系等）
等がある。塗装前処理されたステンレス鋼板にロールコ
ート，カーテンコート，スプレー，浸漬法等によってク
リア塗料が塗布され、たとえば２００〜３００℃で焼き
付けることによりクリア塗膜が形成される。
【００１０】使用可能なクリア塗料は、屈折率１.４０
以上、膜厚２０μｍのときの可視光透過率６０％以上の
クリア塗膜であって、ステンレス鋼板に塗布したとき塗
装鋼板が６０度での鏡面光沢４００以上になるようなも
のである限り、特に樹脂種に制約を受けるものではない
が、具体的にはアクリル樹脂，アクリルシリコーン樹
脂，アクリルフッ素樹脂，フッ素樹脂等を樹脂ベースに
した樹脂塗料が使用される。クリア塗料には、必要に応
じて顔料，染料，メタリック顔料，パール顔料を配合し
ても良い。クリア塗膜は、２〜２０μｍ程度の膜厚で、
単層又は複層の塗膜としてステンレス鋼板上に設けられ
る。複層構成のクリア塗膜を形成する場合、最表層から
下層に向けて屈折率が高くなるように塗料を選定するこ
とが好ましい。
【００１１】
【実施例】ＢＡ仕上げ，ヘアライン仕上げ，Ｎｏ.４仕
上げ（JIS R6001 １５０〜１８０メッシュの研磨剤を
塗布したベルトによる研磨）した板厚０.５ｍｍのステ
ンレス鋼板を塗布型クロメート処理し、Ｃｒ換算付着量
２０ｍｇ／ｍ２のクロメート皮膜を形成した。次いで、
表１に示すクリア塗膜をステンレス鋼板に塗布し、２１
５〜２５０℃で３０〜６０秒加熱する１コート１ベーク
により乾燥膜厚１０μｍの１コートクリア塗膜を形成し
た。一部のステンレス鋼板については、膜厚５μｍの下
塗り塗膜を形成した後、同様な方法で膜厚１０μｍの上
塗り塗膜を形成する２コート２ベーク方式でクリア塗膜
を形成した。なお、表１中の透過率は、別途、膜厚２０
μｍの塗膜を形成して測定したものである。
【００１２】
【００１３】得られた各クリア塗装ステンレス鋼板から
試験片を切り出し、JIS K5600に準拠して６０度での鏡
面光沢を測定すると共に、次の試験方法で外観を調査し
た。
外観試験１
クリア塗膜の表面を垂直方向から目視観察し、濁りが目
立つものを×，僅かに濁りが観察されたものを△，濁り
が検出されなかったものを○として濁り具合を官能評価
した。
外観試験２
法線に関して６０度の角度でクリア塗膜の表面を目視観
察し、濁りが目立つものを×，僅かに濁りが観察された
ものを△，濁りが検出されなかったものを○として濁り
具合を官能評価した。
【００１４】表２の試験結果にみられるように、本発明
の範囲内である実施例１〜１２は優れた光沢，透明性を
示すが、屈折率，透過率が範囲外である比較例１３〜１
５では濁り，曇りが目立っていた。
【００１５】【００１６】
【発明の効果】以上に説明したように、本発明のクリア
塗装ステンレス鋼板は、濁りがなく透明性の高いクリア
塗膜を表面に形成しているのでステンレス鋼素地の美麗
な金属光沢を活用でき、意匠性に優れた家電機器の筐
体，内装材，表装材等として使用される。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clear-coated stainless steel sheet suitable as a housing, an interior material and the like of home electric appliances. [0002] The housing and interior materials of home electric appliances include:
Conventionally, a pre-coated steel sheet in which a colored steel sheet is coated with a colored enamel paint has been generally used. In recent years, where tastes have been diversifying, there has been a demand for housings and interior materials that have a luxurious appearance that makes use of the metallic luster of stainless steel substrates. Painted stainless steel plates are also being used.
For clear painted stainless steel sheet, polyester resin,
Clear paints such as acrylic resin, silicone polyester resin, acrylic silicone resin, and fluororesin are used. A clear paint is applied to the stainless steel plate which has been subjected to the pre-coating treatment, and a clear coat is formed by one coat and one bake or two coats and two bake. [0003] It is desired that the clear paint contains a highly transparent resin as a main component in order to make use of the metallic luster of the stainless steel base. Above all, a BA (bright annealed) finished plate with the highest metallic luster of a stainless steel base gives a high-grade appearance, but the reflected light is high, so the transparency and turbidity are lower than other finishing materials. Deterioration of appearance such as fogging is easy to notice. Turbidity is noticeably recognized when the clear coating is observed from an oblique direction. SUMMARY OF THE INVENTION The present invention has been devised to solve such a problem. The present invention regulates the mirror gloss of a clear coating film to suppress turbidity and improve transparency. It is an object of the present invention to provide a clear-painted stainless steel sheet with an improved level. In order to achieve the object, the clear-coated stainless steel sheet of the present invention is formed from a resin paint containing no benzene ring on the surface of the steel sheet, has a refractive index of 1.40 or more, and has a thickness of 2
It has a clear coating film having a visible light transmittance of 60% or more at 0 μm, and a mirror gloss at 60 degrees of 400 or more. The present inventors have observed the surface of a clear-coated stainless steel plate and investigated various properties of the coating film on transparency, turbidity and the presence or absence of fogging. As a result, it has been found that, when the mirror gloss at 60 degrees of the clear-coated stainless steel sheet is 400 or more, turbidity and fogging are suppressed, transparency and metallic gloss are improved, and a high-grade appearance is obtained. The specular gloss at 60 degrees can be determined by a measurement method specified in JIS K5600. The effect of the specular gloss on the occurrence of turbidity is assumed as follows. Turbidity is caused by diffuse reflection of light due to minute irregularities on the coating film surface. In this respect, if the amount of specular reflection is sufficiently large with little unevenness on the coating film surface, metallic luster is obtained, and if the amount of specular reflection is reduced by diffuse reflection, turbidity appears. Therefore, the diffuse reflection caused by the fine irregularities on the surface is suppressed, and the 60%
By setting the specular gloss in degree to 400 or more, a metallic luster with high transparency and no turbidity is developed. The specular gloss can be adjusted by the leveling property of the coating film, the film thickness, the surface roughness of the original paint plate, and the like. The higher the leveling property, the thicker the film thickness, and the lower the surface roughness of the original paint plate, the higher the specular gloss. [0006] When light is transmitted through the clear coating film and absorbs in the near ultraviolet region including the visible light region, the visible light transmittance is reduced and turbidity occurs. The absorption in the near ultraviolet region including the visible light region is derived from a conjugated double bond of the benzene ring itself or a bond in which the benzene ring is conjugated to a double bond near the benzene ring. The conjugate bond that causes absorption of transmitted light occurs when a resin coating having a benzene ring in its molecular structure is baked and cured, or when left in a use environment for a long time. On the other hand, when a resin paint containing no benzene ring is used, the visible light transmittance at a film thickness of 20 μm becomes 60% or more, and a clear coating film having high transparency without turbidity or fogging is formed. In addition, the film thickness is 20 μm.
The visible light transmittance at the time of using a spectrophotometer, film thickness 20μ
It is determined by measuring transmitted light having a wavelength of 380 to 780 nm transmitted through the clear coating film of m, and integrating the measured light amount. The presence or absence of turbidity is also affected by the optical path length of the transmitted light in the clear coating. In other words, as the optical path length in the clear coating film increases, the proportion of transmitted light that has entered the clear coating film from an oblique direction increases, resulting in an increase in turbidity. The increase in turbidity due to the optical path length can be suppressed by increasing the refractive index of the clear coating film. Light incident on the clear coating from the atmosphere is refracted at the air / coating interface, and the refraction angle at this time increases according to the refractive index of the clear coating. A large refraction angle means that the transmitted light is refracted in a direction close to a right angle to the stainless steel substrate. As a result, the higher the refractive index, the shorter the optical path length of the transmitted light. Therefore, components absorbed by the clear coating film are reduced, and turbidity of the clear coating film is suppressed. The effect of suppressing turbidity due to the refractive index becomes significant at a refractive index of 1.40 or more, and is realized when the visible light transmittance at a film thickness of 20 μm is 60% or more. The refractive index can be determined by irradiating the free clear coating film with a sodium D light source in an atmosphere at 20 ° C. and measuring the light incident on the free clear coating material with a multi-wavelength Abbe refractometer. The free clear coating film can be produced by applying a clear paint to an ETFE laminated steel sheet, baking and curing, and then peeling off the ETFE laminated steel sheet. With a refractive index of 1.40 or more,
A clear coated stainless steel sheet having a clear coating film with a visible light transmittance of 60% or more at a film thickness of 20 μm and a mirror gloss at 60 degrees of 400 or more has a high transparency, so the metallic luster of the stainless steel substrate is high. Can be utilized. A high transparency is imparted to a clear coated stainless steel sheet in a clear coating film containing a pigment, a dye, a metallic pigment, and a pearl pigment, which more vividly reflects the color tone of the pigment and has an excellent design. DESCRIPTION OF THE PREFERRED EMBODIMENTS A coating original plate on which a clear coating film is formed includes:
Various stainless steel sheets are used irrespective of steel type and finishing method. Above all, when a stainless steel sheet finished with BA is used, the transparency of the clear coating film is utilized, and the stainless steel sheet is used for a casing, interior material, surface material, etc. which presents a beautiful appearance. Stainless steel sheets are subjected to various pre-coating treatments as necessary to enhance the adhesion of the coating film. Pre-coating treatments include degreasing, chromate treatment, phosphate treatment, tannic acid treatment,
Non-chromium treatment (silica, zirconia, titanium, etc.)
Etc. A clear paint is applied to the stainless steel plate that has been pre-treated by roll coating, curtain coating, spraying, dipping, or the like, and the clear coating is formed by baking at, for example, 200 to 300 ° C. A usable clear paint has a refractive index of 1.40.
Above, as long as it is a clear coating film having a visible light transmittance of 60% or more when the film thickness is 20 μm and the coated steel plate has a specular gloss at 60 degrees of 400 or more when applied to a stainless steel plate, Although there is no restriction on the type of resin, specifically, a resin paint based on an acrylic resin, an acrylic silicone resin, an acrylic fluororesin, a fluororesin, or the like is used. Pigments, dyes, metallic pigments, and pearl pigments may be added to the clear paint as needed. The clear coating film has a thickness of about 2 to 20 μm,
It is provided on a stainless steel plate as a single-layer or multi-layer coating film. When forming a clear coating film having a multilayer structure, it is preferable to select a coating material such that the refractive index increases from the outermost layer toward the lower layer. A stainless steel sheet having a thickness of 0.5 mm, which has been subjected to a BA finish, a hairline finish, and a No. 4 finish (polishing with a belt coated with a 150-180 mesh abrasive) is subjected to a coating type chromate treatment. A chromate film having a Cr equivalent adhesion amount of 20 mg / m 2 was formed. Then
The clear coating shown in Table 1 was applied to a stainless steel plate,
A one-coat clear coating film having a dry film thickness of 10 μm was formed by one-coat one-bake heating at 5 to 250 ° C. for 30 to 60 seconds. For some stainless steel plates, a clear coat was formed by a two-coat two-bake method of forming a 10 μm-thick top coat by the same method after forming a 5 μm-thick undercoat coat. Note that the transmittance in Table 1 indicates that the film thickness is 20
It is measured after forming a coating film of μm. [0012] A test piece was cut out from each of the clear-coated stainless steel sheets obtained, the specular gloss at 60 ° was measured in accordance with JIS K5600, and the appearance was examined by the following test method. Appearance test 1 The surface of the clear coating film was visually observed from the vertical direction, and the degree of turbidity was evaluated organoleptically by indicating x where turbidity was conspicuous, Δ when slight turbidity was observed, and な か っ when no turbidity was detected. . Appearance test 2 The surface of the clear coating film was visually observed at an angle of 60 degrees with respect to the normal line, and the appearance of turbidity was marked as x, the slight turbidity was marked as △, and the turbidity was not detected as ○. The condition was sensory evaluated. As can be seen from the test results in Table 2, Examples 1 to 12, which are within the scope of the present invention, show excellent gloss and transparency, but Comparative Example 13, in which the refractive index and transmittance are out of the range. ~ 1
5 was cloudy and cloudy. [0015] As described above, the clear-coated stainless steel sheet of the present invention has a clear coating film having no turbidity and a high transparency, so that the beautiful metallic luster of the stainless steel base is obtained. It can be used as a housing, interior material, surface material, etc. of home appliances with excellent design.
フロントページの続き (56)参考文献 特開2001−9367（ＪＰ，Ａ) 特開2000−279880（ＪＰ，Ａ) 特開 平７−108220（ＪＰ，Ａ) 特開 平９−85880（ＪＰ，Ａ) 特開 平３−271379（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B32B 1/00 - 35/00 C09D 1/00 - 201/10 B05D 1/00 - 7/26 Continuation of the front page (56) References JP-A-2001-9367 (JP, A) JP-A-2000-279880 (JP, A) JP-A-7-108220 (JP, A) JP-A-9-85880 (JP, A) JP-A-3-271379 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B32B 1/00-35/00 C09D 1/00-201/10 B05D 1/00-7 / 26
Claims (1)
塗料から形成され、屈折率が１．４０以上で，膜厚２０
μｍのときの可視光透過率が６０％以上であるクリア塗
膜を有し、６０度での鏡面光沢が４００以上であること
を特徴とする透明性に優れたクリア塗装ステンレス鋼
板。(57) [Claims] [Claim 1] Resin containing no benzene ring on the surface of steel sheet
It is made of paint, has a refractive index of 1.40 or more, and has a thickness of 20
Clear coating with visible light transmittance of 60% or more at μm
A clear-coated stainless steel sheet having excellent transparency and having a film and a mirror gloss at 60 degrees of 400 or more .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001352879A JP3429292B2 (en) | 2001-11-19 | 2001-11-19 | Clear coated stainless steel plate with excellent transparency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001352879A JP3429292B2 (en) | 2001-11-19 | 2001-11-19 | Clear coated stainless steel plate with excellent transparency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003145671A JP2003145671A (en) | 2003-05-20 |
| JP3429292B2 true JP3429292B2 (en) | 2003-07-22 |
Family
ID=19164997
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001352879A Expired - Lifetime JP3429292B2 (en) | 2001-11-19 | 2001-11-19 | Clear coated stainless steel plate with excellent transparency |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4808717B2 (en) * | 2005-07-28 | 2011-11-02 | 新日本製鐵株式会社 | Pre-coated metal plate and manufacturing method thereof |
| US20070218301A1 (en) * | 2006-03-15 | 2007-09-20 | Pachuta Justin A | Tinted anti-fingerprint coating on 430 stainless steel for appliances |
| JP4783274B2 (en) * | 2006-12-18 | 2011-09-28 | 日鉄住金鋼板株式会社 | Painted metal plate |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03271379A (en) * | 1990-03-20 | 1991-12-03 | Kawasaki Steel Corp | Stainless steel sheet to be coated and coated steel sheet |
| JP3424084B2 (en) * | 1993-10-15 | 2003-07-07 | 日本冶金工業株式会社 | Painted stainless steel sheet excellent in weather resistance and adhesion, and method for producing the same |
| JPH0985880A (en) * | 1995-09-25 | 1997-03-31 | Nkk Corp | Clear coating stainless steel sheet |
| JP4067222B2 (en) * | 1999-03-29 | 2008-03-26 | 日新製鋼株式会社 | Transparent fluororesin-coated stainless steel plate with excellent wear resistance, fingerprint resistance and design |
| JP2001009367A (en) * | 1999-06-24 | 2001-01-16 | Nisshin Steel Co Ltd | High hardness transparent fluoroplastic coated stainless steel panel and production method thereof |
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