JP2003154309A - Clearly coated stainless steel sheet with high resistance to marking and superb workability - Google Patents
Clearly coated stainless steel sheet with high resistance to marking and superb workabilityInfo
- Publication number
- JP2003154309A JP2003154309A JP2001354407A JP2001354407A JP2003154309A JP 2003154309 A JP2003154309 A JP 2003154309A JP 2001354407 A JP2001354407 A JP 2001354407A JP 2001354407 A JP2001354407 A JP 2001354407A JP 2003154309 A JP2003154309 A JP 2003154309A
- Authority
- JP
- Japan
- Prior art keywords
- coating film
- stainless steel
- clear coating
- clear
- steel sheet
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、表面光沢を強調した家
電機器の筐体，内装材，表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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clear-painted stainless steel sheet suitable as a housing, interior material, surface material, etc. of home electric appliances with enhanced surface gloss.
【０００２】[0002]
【従来の技術】家電機器の筐体や内装材，表装材には、
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，シリコー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。2. Description of the Related Art For housings of home appliances, interior materials, and surface materials,
A precoated steel sheet, which is a coated steel sheet coated with a colored enamel paint, has been generally used. In recent years, where the tastes are diversifying, there is a demand for housings and interior materials that have a high-class appearance that takes advantage of the metallic luster of the stainless steel base. Painted stainless steel sheets are also beginning to be 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. The clear paint is applied to the pre-painted stainless steel plate, and the clear coating film is formed by 1 coat 1 bake or 2 coat 2 bake.
【０００３】[0003]
【発明が解決しようとする課題】クリア塗装ステンレス
鋼板は、通常のめっき鋼板に比較して表面が不活性のス
テンレス鋼板を塗装原板にしているので、良好な塗膜密
着性が得られがたい。なかでも、鏡面外観を呈するＢＡ
仕上げステンレス鋼板は、緻密な不動態皮膜が形成され
ているため密着性の良好な塗膜を形成しがたい。密着性
の低い塗膜では、クリア塗装ステンレス鋼板に曲げ加
工，絞り加工等の加工を施したとき割れ，剥離等の加工
欠陥を発生させ、外観を著しく劣化させる。Since the clear coated stainless steel sheet uses a stainless steel sheet whose surface is inactive as a coating original sheet as compared with a normal plated steel sheet, it is difficult to obtain good coating adhesion. Above all, BA with a mirror-like appearance
A finished stainless steel sheet has a dense passivation film formed thereon, and thus it is difficult to form a coating film with good adhesion. A coating film with low adhesion causes processing defects such as cracking and peeling when the clear coated stainless steel plate is subjected to processing such as bending and drawing, resulting in a marked deterioration in appearance.
【０００４】また、響体，内装材，表装材等に使用され
るクリア塗装ステンレス鋼板は、高い表面光沢が特長の
一つであるが、高い表面光沢がゆえに塗膜表面の疵や跡
残りが目立ちやすい。たとえば、クリア塗装ステンレス
鋼板の取扱いや運搬時に塗膜表面が疵付きやすい。梱包
後に段積みすると発泡スチロールの亀甲状模様が残り、
クリア塗装ステンレス鋼板の上に他の機器，器物等を載
置すると接触部の塗膜表面が変形し、或いは塗膜からの
可塑剤移行に起因する跡残りが生じる。The clear-painted stainless steel sheets used for sound absorbers, interior materials, surface materials, etc. are characterized by high surface gloss. However, because of the high surface gloss, scratches and marks on the surface of the coating film do not occur. It is easily noticeable. For example, the surface of a coated film is easily scratched when handling or transporting a clear-coated stainless steel plate. When stacked after packing, the styrofoam turtle shell pattern remains,
When other equipment, equipment, etc. are placed on the clear-painted stainless steel plate, the surface of the coating film at the contact portion is deformed, or traces are left due to migration of the plasticizer from the coating film.
【０００５】[0005]
【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、弾性率，膜厚が
規制された二層構成のクリア塗膜を形成することによ
り、加工性，耐疵付き性，耐跡残り性を改善し、金属光
沢のある美麗な外観を呈する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。The present invention has been devised in order to solve such problems, and by forming a two-layer clear coating film in which the elastic modulus and the film thickness are regulated. Another object of the present invention is to provide a clear-painted stainless steel sheet which has improved workability, scratch resistance, and trace resistance and has a beautiful appearance with metallic luster.
【０００６】本発明のクリア塗装ステンレス鋼板は、下
層クリア塗膜及び上層クリア塗膜からなる二層構成のク
リア塗膜が基材ステンレス鋼板の表面に設けられてい
る。下層クリア塗膜の弾性率Ｅ1，膜厚Ｔ1と上層クリア
塗膜の弾性率Ｅ2，膜厚Ｔ2の間にＥ2≧１２００Ｎ／ｍ
ｍ2，Ｅ1／Ｅ2＝０.３〜０.９５，Ｔ2≧２μｍ，Ｔ2／
Ｔ 1＝０.３０〜３.０を満足させるとき、加工性，耐疵
付き性，耐跡残り性に優れたクリア塗装ステンレス鋼板
となる。下層クリア塗膜は、たとえばアクリル樹脂，エ
ポキシ樹脂，ポリエステル樹脂，フッ素樹脂の１種又は
２種以上を主成分にする塗料から形成される。上層クリ
ア塗膜は、たとえばアクリル樹脂又はアクリルシリコー
ン樹脂を主成分とする塗料から形成される。The clear coated stainless steel sheet of the present invention is
A two-layer structure consisting of a layer clear coating and an upper clear coating.
The rear coating is provided on the surface of the base stainless steel plate.
It Elastic modulus E of lower clear coating1, Film thickness T1And upper layer clear
Elastic modulus of coating E2, Film thickness T2Between E2≧ 1200N / m
m2, E1/ E2= 0.3 to 0.95, T2≧ 2μm, T2/
T 1= 0.30 to 3.0, workability and scratch resistance
Clear coated stainless steel plate with excellent adhesion and trace resistance
Becomes The lower clear coating film is, for example, acrylic resin,
1 type of poxy resin, polyester resin, fluororesin or
It is formed from a paint containing two or more kinds as main components. Upper chestnut
A coating film is, for example, acrylic resin or acrylic silicone
It is formed from a paint whose main component is resin.
【０００７】[0007]
【作用】耐疵付き性，耐跡残り性は、塗膜の硬質化や光
沢度調整等によって改善される。エナメル塗膜であれば
顔料，骨材等を添加して硬質化し或いは光沢度を下げる
ことによって耐疵付き性，耐跡残り性が向上するが、透
明性，光沢が要求されるクリア塗膜では、顔料や骨材を
添加できないため塗膜樹脂自体の硬度を高める必要があ
る。塗膜樹脂自体の硬度上昇は、絞り加工を始めとした
加工性を低下させる原因となる。基材ステンレス鋼板に
対する密着性を確保するための下層クリア塗膜及び耐疵
付き性に有効な硬度をもつ上層クリア塗膜の二層構成を
採用することにより、下層クリア塗膜で加工性の低下を
ある程度抑えることができる。しかし、硬質の上層クリ
ア塗膜では加工時に生じる応力が高く、下層クリア塗膜
で応力を十分に緩和できず、塗膜剥離，割れ等の欠陥発
生に至ることが多い。極めて硬質の上層クリア塗膜を設
けた場合でも跡残りが生じることもある。[Function] The scratch resistance and the residual trace resistance are improved by hardening the coating film and adjusting the glossiness. If it is an enamel coating, by adding pigments, aggregates, etc. to make it hard or reduce the glossiness, the scratch resistance and trace resistance are improved, but in the case of a clear coating that requires transparency and gloss However, since it is not possible to add pigments or aggregates, it is necessary to increase the hardness of the coating resin itself. An increase in the hardness of the coating resin itself causes a decrease in workability including drawing. By adopting a two-layer structure consisting of a lower clear coating film to ensure adhesion to the base stainless steel plate and an upper clear coating film with a hardness effective for scratch resistance, the workability of the lower clear coating film is reduced. Can be suppressed to some extent. However, a hard upper clear coating film has a high stress generated during processing, and the lower clear coating film cannot sufficiently relax the stress, and often causes defects such as coating film peeling and cracking. Trace marks may occur even when a very hard top clear coating film is provided.
【０００８】そこで、本発明者等は、二層構成のクリア
塗膜を前提とし、下層クリア塗膜，上層クリア塗膜の諸
特性について種々調査検討した。その結果、硬度，膜
厚，加工性等、クリア塗装ステンレス鋼板の要求特性を
満足させる上で、塗膜の弾性率及び膜厚が有効な指標と
なることを見出した。すなわち、弾性率Ｅ1，膜厚Ｔ1の
下層クリア塗膜及び弾性率Ｅ2，膜厚Ｔ2の上層クリア塗
膜をもつ二層構成のクリア塗膜において、Ｅ2≧１２０
０Ｎ／ｍｍ2，Ｅ1／Ｅ2＝０.３〜０.９５，Ｔ2≧２μ
ｍ，Ｔ2／Ｔ1＝０.３０〜３.０を満足させるとき、Ｎ
ｏ.４（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）仕上げ，ＨＬ（ヘアライ
ン）仕上げ等のステンレス鋼板はもとより、密着性が得
られがたい塗装原板として扱われているＢＡ（光輝焼
鈍）仕上げステンレス鋼板でも耐疵付き性，耐跡残り性
及び加工性を満足させることができた。なお、弾性率
は、２０℃の雰囲気における塗膜の応力−歪曲線の傾き
から求められる。Therefore, the present inventors have conducted various investigations on various characteristics of the lower layer clear coating film and the upper layer clear coating film on the premise of a two-layered clear coating film. As a result, they have found that the elastic modulus of the coating film and the film thickness are effective indices in satisfying the required properties of the clear coated stainless steel plate such as hardness, film thickness and workability. That is, in a two-layered clear coating film having a lower layer clear coating film with an elastic modulus E 1 and a film thickness T 1 and an upper layer clear coating film with an elastic modulus E 2 and a film thickness T 2 , E 2 ≧ 120
0 N / mm 2 , E 1 / E 2 = 0.3 to 0.95, T 2 ≧ 2 μ
m, when satisfying T 2 / T 1 = 0.30~3.0, N
Not only stainless steel sheets such as o.4 (polishing with a belt coated with JIS R6001 150-180 mesh abrasives) finish, HL (hairline) finish, etc., but it is also used as a coating base plate that is difficult to obtain adhesion ( Even with a bright annealed) finished stainless steel sheet, it was possible to satisfy the scratch resistance, trace resistance and workability. The elastic modulus is obtained from the slope of the stress-strain curve of the coating film in the atmosphere of 20 ° C.
【０００９】クリア塗膜は、顔料を含まないため同じ樹
脂ベースからなる塗膜にあっても、エナメル用に顔料を
添加したプライマ塗膜に比較して弾性率が大幅に低くな
る。本発明者等は、通常使用されているプライマ用樹脂
を用い、耐疵付き性や耐跡残り性を満足する弾性率が高
いＥ2≧１２００Ｎ／ｍｍ2の上塗り塗膜との組合せで加
工性を評価した。その結果、通常使用されているプライ
マをクリア塗料化したものを使用した場合、曲げ加工や
絞り加工により基材ステンレス鋼板側にプライマ塗膜が
残ったまま上層クリア塗膜が剥離する現象が生じること
を見出した。Since the clear coating film does not contain a pigment, even if it is a coating film made of the same resin base, the elastic modulus is significantly lower than that of a primer coating film to which a pigment is added for enamel. The inventors of the present invention have used a commonly used primer resin and have a high elastic modulus satisfying scratch resistance and trace resistance E 2 ≧ 1200 N / mm 2 in combination with a top coat film for processability. Was evaluated. As a result, when a clear paint is used for the normally used primer, the phenomenon that the upper clear coating film peels off with the primer coating film remaining on the base stainless steel plate side may occur due to bending or drawing. Found.
【００１０】上層クリア塗膜の剥離は、耐疵付き性、耐
跡残り性を満足させるために非常に弾性率の高い樹脂塗
料を上塗りに使用したことから、加工時の応力が大きな
収縮応力となって上層クリア塗膜に作用し、上層クリア
塗膜近傍の下塗り塗膜が収縮応力に耐え切れず凝集破壊
することに原因があるものと推察した。そこで、下層ク
リア塗膜用のクリア塗料に過剰量の硬化剤を配合し、或
いは塗料樹脂の分子量や樹脂種の変更等によって、従来
のクリア塗料に比較して弾性率を大幅に高めたクリア塗
料を用いて下層クリア塗膜を形成したところ、曲げ加工
や絞り加工時の塗膜剥離を防止できた。すなわち、上層
クリア塗膜の高い応力を考慮して、その応力に耐え得る
高弾性率の下層クリア塗膜を形成するとき、上層クリア
塗膜の剥離防止が可能になることが判った。Since peeling of the upper clear coating film uses a resin coating having a very high elastic modulus as the top coating to satisfy scratch resistance and trace remnant resistance, the stress at the time of processing causes a large shrinkage stress. It is speculated that this is due to the fact that it acts on the upper clear coating film and the undercoat coating film near the upper clear coating film cannot withstand the shrinkage stress and undergoes cohesive failure. Therefore, by mixing an excess amount of a curing agent in the clear paint for the lower clear coating film, or by changing the molecular weight of the paint resin or the type of resin, the clear paint has a significantly higher elastic modulus than the conventional clear paint. When a lower clear coating film was formed using, it was possible to prevent the coating film from peeling off during bending or drawing. That is, in consideration of the high stress of the upper clear coating film, it has been found that the peeling of the upper clear coating film can be prevented when the lower clear coating film of high elastic modulus capable of withstanding the stress is formed.
【００１１】剥離防止に及ぼす弾性率の影響を調査した
結果、弾性率比Ｅ1／Ｅ2≧０.３で上層クリア塗膜が剥
離しないことを解明した。従来のプライマのクリア塗料
が１００〜３００Ｎ／ｍｍ2程度の弾性率であることを
考慮すると、弾性率比Ｅ1／Ｅ 2≧０.３を満足する下層
クリア塗膜は、少なくとも３６０Ｎ／ｍｍ2の弾性率が
必要であり、従来のプライマに比較して大幅に高い弾性
率の塗料といえる。他方、下層クリア塗膜の弾性率Ｅ1
は、上層クリア塗膜の応力を緩和させるために上層クリ
ア塗膜の弾性率Ｅ2よりも低くする必要があり、Ｅ1＝Ｅ
2では応力緩和できずに加工部の上層クリア塗膜が剥離
しやすい。このような剥離は、弾性率比Ｅ1／Ｅ2を０.
９５以下に調整することによって防止できる。すなわ
ち、塗膜剥離の抑制には、下層クリア塗膜の弾性率Ｅ1
を大幅に高め、且つ弾性率比Ｅ1／Ｅ2を０.３〜０.９５
の範囲に設定することが有効である。The effect of elastic modulus on peeling prevention was investigated.
As a result, elastic modulus ratio E1/ E2≧ 0.3, the upper clear coating is peeled off
It was clarified that they would not let go. Conventional primer clear paint
Is 100 to 300 N / mm2That the degree of elasticity is
Considering the elastic modulus ratio E1/ E 2Lower layer satisfying ≧ 0.3
Clear coating should be at least 360 N / mm2The elastic modulus of
Required and significantly higher elasticity compared to conventional primers
It can be said to be the paint of the rate. On the other hand, the elastic modulus E of the lower clear coating film1
Clears the upper layer to relieve the stress of the upper layer clear coating.
A Modulus of elasticity E of coating film2Must be lower than E1= E
2Stress could not be relaxed and the upper clear coating of the processed part peeled off
It's easy to do. Such peeling is caused by the elastic modulus ratio E1/ E20.
It can be prevented by adjusting to 95 or less. Sanawa
Then, the elastic modulus E of the lower clear coating film is used to suppress the peeling of the coating film.1
And the elastic modulus ratio E1/ E2To 0.3 to 0.95
It is effective to set within the range.
【００１２】弾性率の他にも、上層クリア塗膜に比較し
て下層クリア塗膜が薄すぎると、下塗りに弾性率の高い
塗膜を配しても基材ステンレス鋼板から塗膜が剥離する
場合がある。すなわち、上層クリア塗膜が厚いと、その
分収縮応力が強くなり、下層クリア塗膜の弾性率Ｅ1を
適正範囲に維持した場合にあっても、薄い下層クリア塗
膜では応力緩和能が不足し塗膜剥離に至るものと推察さ
れる。このような塗膜剥離は、上層クリア塗膜との関連
で下層クリア塗膜の膜厚を確保し、応力緩和能を高める
ことによって防止できる。本発明者等による調査検討の
結果によれば、下層クリア塗膜の膜厚Ｔ1と上層クリア
塗膜の膜厚Ｔ2との膜厚比Ｔ2／Ｔ1を０.３０以上にする
ことによって十分な応力緩和能が下層クリア塗膜に付与
され、塗膜剥離を防止できることが判った。また、塗膜
剥離と耐跡残り性とのバランスから下層クリア塗膜の膜
厚Ｔ1と上層クリア塗膜の膜厚Ｔ2との間には適正領域が
あり、膜厚比Ｔ2／Ｔ1を０.３０〜３.０の範囲に維持す
ることにより、塗膜剥離がなく耐跡残り性に優れた塗膜
が得られる。In addition to the elastic modulus, when the lower clear coating film is too thin as compared with the upper clear coating film, the coating film peels off from the base material stainless steel sheet even if a coating film having a high elastic modulus is arranged as the undercoat. There are cases. That is, when the upper clear coating film is thick, the contraction stress becomes stronger accordingly, and even when the elastic modulus E 1 of the lower clear coating film is maintained in an appropriate range, the thin lower clear coating film lacks stress relaxation ability. It is presumed that the coating film peels off. Such peeling of the coating film can be prevented by ensuring the film thickness of the lower layer clear coating film in relation to the upper layer clear coating film and enhancing the stress relaxation ability. According to the results of the investigation and study by the present inventors, the film thickness ratio T 2 / T 1 between the film thickness T 1 of the lower clear coating film and the film thickness T 2 of the upper clear coating film should be 0.30 or more. It was found that a sufficient stress relaxation ability was imparted to the lower clear coating film and that the coating film peeling could be prevented. In addition, there is an appropriate region between the film thickness T 1 of the lower clear coating film and the film thickness T 2 of the upper clear coating film in view of the balance between the peeling of the coating film and the residual trace resistance, and the film thickness ratio T 2 / T. By maintaining 1 in the range of 0.30 to 3.0, a coating film having no trace film peeling and excellent in trace resistance can be obtained.
【００１３】[0013]
【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
外観を呈する家電機器の筐体，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。BEST MODE FOR CARRYING OUT THE INVENTION
Various stainless steel plates are used regardless of steel type and finishing method. Above all, when a stainless steel sheet with BA finish is used, the transparency of the clear coating film is utilized, and it is used for housings, interior materials, and exterior materials of home appliances that have a beautiful appearance. Stainless steel sheets are subjected to various pre-coating treatments as necessary to enhance the adhesion of the coating film. The pretreatment for coating includes degreasing, chromate treatment, phosphate treatment, tannic acid treatment, non-chromium treatment (silica, zirconia, titanium, etc.).
【００１４】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、２コート２ベークで二層構成の
クリア塗膜が形成される。焼付けも、使用する塗料に応
じて２００〜３００℃の温度範囲で選定される。下層ク
リア塗膜は、上層クリア塗膜の弾性率Ｅ2，膜厚Ｔ2に対
してＥ1／Ｅ2＝０.３〜０.９５，Ｔ2≧２μｍ，Ｔ2／Ｔ
1＝０.３０〜３.０を満足する弾性率Ｅ1，膜厚Ｔ1に調
整される。弾性率比Ｅ1／Ｅ2が０．３未満であれば、上
層クリア塗膜に対して下層クリア塗膜が軟らかすぎ、絞
り加工等の際に上層クリア塗膜の収縮応力に比較して下
層クリア塗膜の耐力が不足し、下層クリア塗膜と上層ク
リア塗膜との間で層間剥離が生じやすくなる。逆に０.
９５を超える弾性率比Ｅ1／Ｅ2では、下層クリア塗膜が
硬くなりすぎて上層クリア塗膜の応力を緩和できず、塗
膜割れや基材ステンレス鋼板からの塗膜剥離が生じやす
くなる。A clear coating material is applied to the pre-painted stainless steel plate by roll coating, curtain coating, spraying, dipping or the like, and a two-layer two-baking clear coating film is formed. The baking is also selected in the temperature range of 200 to 300 ° C. according to the paint used. The lower clear coating film has an elastic modulus E 2 of the upper clear coating film, and E 1 / E 2 = 0.3 to 0.95, T 2 ≧ 2 μm, T 2 / T with respect to the film thickness T 2 .
The elastic modulus E 1 and the film thickness T 1 satisfying 1 = 0.30 to 3.0 are adjusted. When the elastic modulus ratio E 1 / E 2 is less than 0.3, the lower clear coating film is too soft compared to the upper clear coating film, and the lower layer is compared with the contraction stress of the upper clear coating film during drawing. The proof stress of the clear coating film is insufficient, and delamination between the lower clear coating film and the upper clear coating film is likely to occur. On the contrary, 0.
When the elastic modulus ratio E 1 / E 2 exceeds 95, the lower clear coating film becomes too hard to relax the stress of the upper clear coating film, and the coating film cracks and the coating film peeling from the base stainless steel plate easily occur. .
【００１５】膜厚比Ｔ2／Ｔ1が０.３０未満では、比較
的柔らかい下層クリア塗膜の膜厚が厚すぎ、下層クリア
塗膜の変形に起因した塗膜の跡残りが発生しやすくな
る。逆に、３.０を超える膜厚比Ｔ2／Ｔ1では、下層ク
リア塗膜の膜厚Ｔ1が不足し、上層クリア塗膜の応力を
十分に緩和できず、塗膜剥離が生じやすくなる。下層ク
リア塗膜用の樹脂塗料としては、アクリル樹脂，エポキ
シ樹脂，ポリエステル樹脂，フッ素樹脂，フッ素変性ア
クリル樹脂等を樹脂ベースに使用する塗料がある。この
種の樹脂塗料には、通常使用のクリア塗料或いは硬度調
整したクリア塗料が使用される。下塗りクリア塗料に
は、透明性を損なわない程度の着色顔料，染料，パール
顔料，メタリック顔料，骨材等の各種添加材を配合して
も良い。When the film thickness ratio T 2 / T 1 is less than 0.30, the film thickness of the relatively soft lower clear coating film is too thick, and traces of the coating film easily occur due to the deformation of the lower clear coating film. Become. Conversely, the thickness ratio T 2 / T 1 exceeds 3.0, the film thickness T 1 is insufficient for the lower clearcoats, can not be sufficiently relax the stress of the upper layer clearcoats, coating peeling is likely to occur Become. As resin paints for the lower clear coating film, there are paints using acrylic resin, epoxy resin, polyester resin, fluorine resin, fluorine modified acrylic resin, etc. as a resin base. For this type of resin paint, normally used clear paint or hardness-adjusted clear paint is used. The undercoat clear paint may contain various additives such as coloring pigments, dyes, pearl pigments, metallic pigments, aggregates, etc., to the extent that transparency is not impaired.
【００１６】下塗りのクリア塗料樹脂の分子量，ガラス
転移温度等に特段の制約はないが、一般に分子量が小さ
くガラス転移温度が高いほど硬質のクリア塗膜になり，
分子量が大きくガラス転移温度が低いほど加工性の良好
なクリア塗膜になる。分子量、ガラス転移温度の影響を
考慮して，目標とする塗膜性能に合わせてクリア塗料を
適宜調整する。下層クリア塗膜の伸びは、３％以上が好
ましく、弾性率Ｅ1，膜厚Ｔ1が目標条件を満足する範囲
で適宜選定される。下層クリア塗膜を形成した後、アク
リル樹脂，アクリルシリコーン樹脂，シリコーン変性ア
クリル樹脂，シリコーンを添加したアクリル樹脂等を樹
脂ベースとする上層クリア塗膜用の樹脂塗料が塗布され
る。上塗り用樹脂塗料にも、透明性を損なわない程度の
着色顔料，染料，パール顔料，メタリック顔料，骨材等
の各種添加材を配合することができる。There are no particular restrictions on the molecular weight and glass transition temperature of the clear undercoat resin, but generally, the smaller the molecular weight and the higher the glass transition temperature, the harder the clear coating film becomes.
The higher the molecular weight and the lower the glass transition temperature, the clearer the coating becomes with better processability. Considering the effects of molecular weight and glass transition temperature, the clear paint is adjusted appropriately according to the target coating performance. The elongation of the lower clear coating film is preferably 3% or more, and is appropriately selected in such a range that the elastic modulus E 1 and the film thickness T 1 satisfy the target conditions. After forming the lower layer clear coating film, a resin coating material for the upper layer clear coating film, which is based on acrylic resin, acrylic silicone resin, silicone modified acrylic resin, silicone-added acrylic resin or the like, is applied. Various additives such as coloring pigments, dyes, pearl pigments, metallic pigments, and aggregates may be added to the resin coating material for top coating so long as the transparency is not impaired.
【００１７】上塗り用クリア塗料樹脂は、目標とする塗
膜性能に合わせて分子量，ガラス転移温度等が調整され
る。上層クリア塗膜の伸びは、１％以上が好ましく、Ｅ
2≧１２００Ｎ／ｍｍ2，Ｔ2≧２μｍでＥ1／Ｅ2＝０.３
〜０.９５，Ｔ2／Ｔ1＝０.３０〜３.０を満足するよう
に弾性率Ｅ2，膜厚Ｔ2が選定される。弾性率Ｅ2が１２
００Ｎ／ｍｍ2未満では塗膜硬度が不足し、耐疵付き
性，耐跡残り性が低下する。２μｍに満たない膜厚Ｔ2
では、塗膜硬度が十分であっても薄すぎるために塗膜層
としての強度が不足し、発泡スチロール等に接触した状
態で保管，運搬される条件下では跡残り等の表面変形が
塗膜面に発生しやすくなる。The clear coating resin for topcoating has its molecular weight, glass transition temperature and the like adjusted according to the target coating film performance. The elongation of the upper clear coating film is preferably 1% or more.
2 ≧ 1200 N / mm 2 , T 2 ≧ 2 μm, E 1 / E 2 = 0.3
The elastic modulus E 2 and the film thickness T 2 are selected so as to satisfy ˜0.95 and T 2 / T 1 = 0.30 to 3.0. Elastic modulus E 2 is 12
If it is less than 00 N / mm 2 , the hardness of the coating film is insufficient, and the scratch resistance and the trace residue resistance deteriorate. Film thickness T 2 less than 2 μm
However, even if the coating film hardness is sufficient, it is too thin to provide sufficient strength as a coating layer, and surface deformation such as trace marks may occur under the conditions of being stored and transported in contact with Styrofoam. More likely to occur.
【００１８】[0018]
【実施例】ＢＡ仕上げ，ＨＬ仕上げ，Ｎｏ.４仕上げの
各仕上げを施した板厚０.５ｍｍのSUS430ステンレス鋼
板を塗装原板に使用した。塗装原板にＣｒ換算付着量２
０ｍｇ／ｍ2の塗布型クロメート処理を施した後、下塗
り用クリア塗膜を塗布し、２１５〜２５０℃で３０〜６
０秒焼き付けることにより下層クリア塗膜を形成した。
次いで、上塗り用クリア塗膜を塗布し、同様な条件下の
焼付きにより上層クリア塗膜を形成した。使用した下塗
り用，上塗り用クリア塗膜を表１に示す。なお、表１の
弾性率は、幅５ｍｍ，膜厚２０μｍの遊離薄膜を温度２
０℃，引張り速度１０ｍｍ／分で引張試験して得られた
応力−歪曲線の傾きから算出した。また，基材ステンレ
ス鋼板の表面に形成されたクリア塗膜の層構成を表２に
示す。[Examples] A SUS430 stainless steel plate having a thickness of 0.5 mm and subjected to BA finish, HL finish and No. 4 finish was used as a coating base plate. Adhesion amount of Cr equivalent to 2
After a coating type chromate treatment of 0 mg / m 2 is applied, a clear coating film for undercoating is applied, and at 30 to 6 at 215 to 250 ° C.
A lower clear coating film was formed by baking for 0 seconds.
Next, a clear coating film for topcoat was applied, and an upper layer clear coating film was formed by baking under the same conditions. Table 1 shows the clear coating films for undercoating and topcoating used. The elastic modulus shown in Table 1 was measured at a temperature of 2 for a free thin film having a width of 5 mm and a film thickness of 20 μm.
It was calculated from the slope of the stress-strain curve obtained by performing a tensile test at 0 ° C. and a tensile speed of 10 mm / min. Table 2 shows the layer structure of the clear coating film formed on the surface of the base stainless steel plate.
【００１９】 [0019]
【００２０】 [0020]
【００２１】二層構成のクリア塗膜が形成された各クリ
ア塗装ステンレス鋼板から試験片を切り出し、次の試験
方法で耐跡残り性，耐疵付き性，曲げ加工性，絞り加工
性を評価した。
耐跡残り性試験
塗膜面に発泡スチロールを置き、荷重２ｋｇ／ｃｍ2を
加えて６０℃に９６時間放置した後、発泡スチロール取
外し直後に塗膜の外観を目視観察した。跡残りが少しで
も観察された塗膜を×，跡残りが観察されなかった塗膜
を○として耐跡残り性を評価した。
耐疵付き性試験
先端８ｍｍＲのステンレス鋼製柱の先端をキムワイブＳ
２００（株式会社クレシア製）で覆い、常温で１ｋｇの
荷重をかけて３０往復塗膜面を擦った後で塗膜面を観察
した。疵が発生しなかった塗膜を○，疵が検出された塗
膜を×として塗膜の耐疵付き性を評価した。Test pieces were cut out from each clear-coated stainless steel sheet having a two-layered clear coating film, and the following test methods were used to evaluate the trace resistance, scratch resistance, bending workability, and drawability. . Stain-residual resistance test Styrofoam was placed on the surface of the coating film, a load of 2 kg / cm 2 was applied, the mixture was left at 60 ° C for 96 hours, and then the appearance of the coating film was visually observed immediately after the removal of the Styrofoam. The resistance to trace marks was evaluated by setting the coating film in which trace marks were observed even to a small degree and the coating film in which trace marks were not observed to ○. Scratch resistance test Tip 8mmR stainless steel column tip Kimwive S
After covering with 200 (made by Crecia Co., Ltd.) and applying a load of 1 kg at room temperature and rubbing the coated film surface for 30 reciprocations, the coated film surface was observed. The scratch resistance of the coating film was evaluated by setting the coating film in which no flaw was generated as ◯ and the coating film in which the flaw was detected as x.
【００２２】曲げ加工試験
２０℃で試験片を１８０度（２ｔ）曲げ加工し、曲げ部
外側に接着テープを貼り付け引き剥がすテープ剥離試験
によって塗膜の剥離状況を調査した。塗膜剥離が検出さ
れなかったものを○，１０％未満の塗膜剥離が生じたも
のを△，１０％以上の塗膜剥離が生じたものを×として
曲げ加工性を評価した。
絞り加工試験
２０℃で試験片を角筒状に絞り加工し、コーナー部及び
端面部の塗膜を観察し、割れ，塗膜剥離の有無を調査し
た。割れや塗膜剥離が発生したものを×，塗膜や塗膜剥
離が発生しなかったものを○として絞り加工性を評価し
た。Bending test The test piece was bent 180 degrees (2t) at 20 ° C., and the peeling condition of the coating film was investigated by a tape peeling test in which an adhesive tape was attached to the outside of the bent portion and peeled off. The bending workability was evaluated by ◯ when the coating film peeling was not detected, Δ when the coating film peeling was less than 10%, and X when the coating film peeling was 10% or more. Drawing Test A test piece was drawn into a rectangular tube shape at 20 ° C., and the coating films at the corners and end faces were observed to check for cracks and film peeling. The drawability was evaluated as × when cracking or peeling of the coating film occurred and as ○ when no coating film or peeling of the coating film occurred.
【００２３】表３の試験結果にみられるように、本発明
で規定した弾性率，膜厚の条件を満足する試験番号１〜
１４のクリア塗装ステンレス鋼板は、何れも良好な耐跡
残り性，耐疵付き性，加工性を示した。他方、弾性率比
Ｅ1／Ｅ2が０.３〜０.９５の範囲を外れる試験番号１
５，１９や膜厚比Ｔ2／Ｔ1が７.０と大きな試験番号１
６では加工性に劣り、膜厚比Ｔ2／Ｔ1が０.１４と小さ
すぎる試験番号１７や上層クリア塗膜の膜厚Ｔ2が１μ
ｍと薄い試験番号１８では耐跡残り性に劣っていた。こ
の対比から明らかなように、下層クリア塗膜の弾性率Ｅ
1，膜厚Ｔ1と上層クリア塗膜の弾性率Ｅ2，膜厚Ｔ2との
間に所定の関係を成立させるとき、耐跡残り性及び加工
性の双方共に優れたクリア塗装ステンレス鋼板が得られ
ることが確認された。As can be seen from the test results in Table 3, test numbers 1 to 1 satisfying the conditions of elastic modulus and film thickness specified in the present invention.
The clear-coated stainless steel sheets of No. 14 all showed good trace resistance, scratch resistance, and workability. On the other hand, test number 1 in which the elastic modulus ratio E 1 / E 2 is out of the range of 0.3 to 0.95
5, 19 and film thickness ratio T 2 / T 1 of 7.0, a large test number 1
6, the workability was poor, and the film thickness ratio T 2 / T 1 was 0.14, which was too small, such as Test No. 17 and the film thickness T 2 of the upper clear coating film was 1 μm.
In Test No. 18, which is as thin as m, the trace resistance was inferior. As is clear from this comparison, the elastic modulus E of the lower clear coating film
1. When a predetermined relationship is established between the film thickness T 1 , the elastic modulus E 2 of the upper clear coating film, and the film thickness T 2 , a clear coated stainless steel plate excellent in both trace resistance and workability is obtained. It was confirmed that it was obtained.
【００２４】 [0024]
【００２５】[0025]
【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、基材ステンレス鋼板に二層構成
のクリア塗膜を設け、下層クリア塗膜の弾性率Ｅ1，膜
厚Ｔ1と上層クリア塗膜の弾性率Ｅ2，膜厚Ｔ2との間に
所定の関係を維持させることによって、耐疵付き性のた
めに上層クリア塗膜を硬質化した場合にあっても良好な
加工性を維持している。そのため、ステンレス鋼板本来
の優れた金属光沢のある外観を活用し、意匠性の高い家
電機器の響体，内装材，表装材等として使用される。As described above, in the clear-coated stainless steel sheet of the present invention, the base stainless steel sheet is provided with a two-layered clear coating film, and the elastic modulus E 1 and film thickness T 1 of the lower clear coating film are set. By maintaining a predetermined relationship between the elastic modulus E 2 of the upper clear coating film and the film thickness T 2 of the upper clear coating film, even if the upper clear coating film is hardened for scratch resistance, it is preferable. Maintains workability. Therefore, by utilizing the original excellent metallic luster appearance of the stainless steel plate, it is used as a reverberant, interior material, and exterior material for home appliances with high design.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１４年８月７日（２００２．８．７）[Submission date] August 7, 2002 (2002.8.7)
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００４[Correction target item name] 0004
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００４】また、筐体，内装材，表装材等に使用され
るクリア塗装ステンレス鋼板は、高い表面光沢が特長の
一つであるが、高い表面光沢がゆえに塗膜表面の疵や跡
残りが目立ちやすい。たとえば、クリア塗装ステンレス
鋼板の取扱いや運搬時に塗膜表面が疵付きやすい。梱包
後に段積みすると発泡スチロールの亀甲状模様が残り、
クリア塗装ステンレス鋼板の上に他の機器，器物等を載
置すると接触部の塗膜表面が変形し、或いは塗膜からの
可塑剤移行に起因する跡残りが生じる。Further, the clear coated stainless steel sheet used for the casing, the interior material, the surface material, etc. has one of the features of high surface gloss, but due to the high surface gloss, the coating film surface has no flaws or marks. It is easily noticeable. For example, the surface of a coated film is easily scratched when handling or transporting a clear-coated stainless steel plate. When stacked after packing, the styrofoam turtle shell pattern remains,
When other equipment, equipment, etc. are placed on the clear-painted stainless steel plate, the surface of the coating film at the contact portion is deformed, or traces are left due to migration of the plasticizer from the coating film.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２５[Name of item to be corrected] 0025
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２５】[0025]
【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、基材ステンレス鋼板に二層構成
のクリア塗膜を設け、下層クリア塗膜の弾性率Ｅ1，膜
厚Ｔ1と上層クリア塗膜の弾性率Ｅ2，膜厚Ｔ2との間に
所定の関係を維持させることによって、耐疵付き性のた
めに上層クリア塗膜を硬質化した場合にあっても良好な
加工性を維持している。そのため、ステンレス鋼板本来
の優れた金属光沢のある外観を活用し、意匠性の高い家
電機器の筐体，内装材，表装材等として使用される。As described above, in the clear-coated stainless steel sheet of the present invention, the base stainless steel sheet is provided with a two-layered clear coating film, and the elastic modulus E 1 and film thickness T 1 of the lower clear coating film are set. By maintaining a predetermined relationship between the elastic modulus E 2 of the upper clear coating film and the film thickness T 2 of the upper clear coating film, even if the upper clear coating film is hardened for scratch resistance, it is preferable. Maintains workability. Therefore, by utilizing the original excellent metallic luster appearance of the stainless steel plate, it is used as a housing, interior material, and exterior material of highly designed home electric appliances.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０９Ｄ 183/07 Ｃ０９Ｄ 183/07 201/00 201/00 Ｃ２３Ｃ 28/00 Ｃ２３Ｃ 28/00 Ｚ (72)発明者 森 浩治 千葉県市川市高谷新町７番１号 日新製鋼 株式会社技術研究所内 Ｆターム(参考） 4D075 AE03 AE07 CA02 CA03 CB04 CB06 DA06 DB04 DC01 DC10 DC19 EA41 EA43 EB16 EB22 EB33 EB35 EB43 4J038 CD091 CG141 DB001 DD001 DL101 FA241 NA01 NA11 NA12 PC02 4K044 AA03 AB02 BA21 BB03 BB15 BB16 BC04 BC05 BC09 CA04 CA53 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) C09D 183/07 C09D 183/07 201/00 201/00 C23C 28/00 C23C 28/00 Z (72) Invention Person Koji Mori 7-1 Takatani Shinmachi, Ichikawa City, Chiba Prefecture F-Term (Reference) in Technical Research Institute of Nisshin Steel Co., Ltd. 4D075 AE03 AE07 CA02 CA03 CB04 CB06 DA06 DB04 DC01 DC10 DC19 EA41 EA43 EB16 EB22 EB33 EB35 EB43 4J038 CD091 CG141 DB001 DB001 DB141 DL101 FA241 NA01 NA11 NA12 PC02 4K044 AA03 AB02 BA21 BB03 BB15 BB16 BC04 BC05 BC09 CA04 CA53
Claims (3)
０.３〜０.９５，Ｔ2≧２μｍ，Ｔ2／Ｔ1＝０.３０〜
３.０を満足する弾性率Ｅ1，膜厚Ｔ1の下層クリア塗膜
及び弾性率Ｅ2，膜厚Ｔ2の上層クリア塗膜が基材ステン
レス鋼板の表面に設けられていることを特徴とする耐跡
残り性，加工性に優れたクリア塗装ステンレス鋼板。1. E 2 ≧ 1200 N / mm 2 , E 1 / E 2 =
0.3 to 0.95, T 2 ≧ 2 μm, T 2 / T 1 = 0.30 to
A lower clear coating film having an elastic modulus E 1 and a film thickness T 1 satisfying 3.0 and an upper clear coating film having an elastic modulus E 2 and a film thickness T 2 satisfying 3.0 are provided on the surface of the base stainless steel plate. Clear coated stainless steel sheet with excellent trace resistance and workability.
テル樹脂，フッ素樹脂の１種又は２種以上を主成分にす
る塗料から下層クリア塗膜が形成されている請求項１記
載のクリア塗装ステンレス鋼板。2. The clear coated stainless steel sheet according to claim 1, wherein the lower clear coating film is formed from a coating material containing one or more of acrylic resin, epoxy resin, polyester resin and fluororesin as main components.
脂を主成分とする塗料から上層クリア塗膜が形成されて
いる請求項１記載のクリア塗装ステンレス鋼板。3. The clear-coated stainless steel sheet according to claim 1, wherein the upper clear coating film is formed from a coating material containing acrylic resin or acrylic silicone resin as a main component.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2001354407A JP3847611B2 (en) | 2001-11-20 | 2001-11-20 | Clear painted stainless steel plate with excellent trace resistance and workability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001354407A JP3847611B2 (en) | 2001-11-20 | 2001-11-20 | Clear painted stainless steel plate with excellent trace resistance and workability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003154309A true JP2003154309A (en) | 2003-05-27 |
| JP3847611B2 JP3847611B2 (en) | 2006-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2001354407A Expired - Fee Related JP3847611B2 (en) | 2001-11-20 | 2001-11-20 | Clear painted stainless steel plate with excellent trace resistance and workability |
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| WO2010114135A1 (en) * | 2009-03-30 | 2010-10-07 | 新日本製鐵株式会社 | Precoated metal sheet and process for producing same |
| WO2011122587A1 (en) | 2010-03-30 | 2011-10-06 | 新日鐵住金ステンレス株式会社 | Clear-coated stainless steel sheet with excellent pressure mark resistance and scratch resistance |
| KR101385419B1 (en) | 2005-08-31 | 2014-04-25 | 램 리써치 코포레이션 | System and method for forming patterned copper lines through electroless copper plating |
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2001
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| KR101385419B1 (en) | 2005-08-31 | 2014-04-25 | 램 리써치 코포레이션 | System and method for forming patterned copper lines through electroless copper plating |
| WO2010114135A1 (en) * | 2009-03-30 | 2010-10-07 | 新日本製鐵株式会社 | Precoated metal sheet and process for producing same |
| CN102369069A (en) * | 2009-03-30 | 2012-03-07 | 新日本制铁株式会社 | Precoated metal sheet and process for producing same |
| TWI409168B (en) * | 2009-03-30 | 2013-09-21 | Nippon Steel & Sumitomo Metal Corp | Precoated metal plate and method of manufacturing the same |
| CN102369069B (en) * | 2009-03-30 | 2014-02-26 | 新日铁住金株式会社 | Precoated metal sheet and process for producing same |
| KR101403151B1 (en) * | 2009-03-30 | 2014-06-03 | 신닛테츠스미킨 카부시키카이샤 | Precoated metal sheet and process for producing same |
| WO2011122587A1 (en) | 2010-03-30 | 2011-10-06 | 新日鐵住金ステンレス株式会社 | Clear-coated stainless steel sheet with excellent pressure mark resistance and scratch resistance |
| US8623502B2 (en) | 2010-03-30 | 2014-01-07 | Nippon Steel & Sumikin Stainless Steel Corporation | Clear-coated stainless steel sheet with excellent pressure mark resistance and scratch resistance |
| JP2014131838A (en) * | 2013-01-04 | 2014-07-17 | Nippon Steel & Sumitomo Metal | Precoated metal plate and method for manufacturing the same excellent in projecting property and excellent in marker drawing property and wiping property |
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| Publication number | Publication date |
|---|---|
| JP3847611B2 (en) | 2006-11-22 |
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