JP3650511B2 - Hammer tone pre-coated metal plate - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、家電製品、家具、建材、自動車部品などの外板として、高意匠性の必要な部位に用いられるハンマートーン調外観を持つプレコート金属板に関する。
【０００２】
【従来の技術】
家電製品、家具、建材および自動車部品などの外板用途として加工・組立後の塗装工程省略を目的として、予め塗装されたプレコート金属板の適用が盛んとなってきている。プレコート金属板の製造方法としてはロールコーター、カーテンフローコーター、ローラーカーテンコーターが挙げられ、量産を目的に主にコイルコート可能な連続塗装ラインにて製造されている。
【０００３】
プレコート金属板においては、特に、家電製品、家具、建材および自動車部品などの分野において、商品の高級感を出すために、意匠外観の要望が強い。近年、これら意匠外観の要望は増加し、特にハンマートーン調外観への要望が高まっている。ハンマートーン調とは、塗膜厚によって濃淡が生じるような塗料を使用し、金属面をハンマーで叩いたかのような凹凸感のある模様を塗装中に形成したもので、小物の塗装品に一部使用されてきたのみであったが、近年、その高級感が見直されるに至り、ハンマートーン調プレコート金属板への需要が高まりつつある。このような市況を鑑み、ハンマートーン調プレコート金属板の製造方法として、特開平８−２１６３３１号公報では、下塗り層の上に中塗り塗料を塗装し、中塗り塗料が乾燥しないうちに、中塗り塗料と相溶可能で、中塗り塗料より表面張力の小さい上塗り塗料を粒状にスプレーすることによって、ハンマートーン模様を製造する技術が開示されている。しかし、連続塗装ラインにおいて製造した場合、上塗り塗料を再現良くスプレーすることが極めて難しく、綺麗な外観を安定的に作り出すことが困難であり、また、従来のロールコート、カーテンコート設備に加えてスプレー塗装設備が必要となるため、製造コストも高くなってしまうなど、必ずしも十分な方法ではなかった。
【０００４】
【発明が解決しようとする課題】
そこで、本発明の目的は、上記状況に鑑み、連続塗装ラインにて安定的に製造可能で、かつ塗膜硬度、塗膜加工性に優れたハンマートーン調プレコート金属板を提供することにある。
【０００５】
【課題を解決するための手段】
発明者らは、鋭意検討の結果、塗料に表面張力の異なる熱溶融性樹脂微粒子を混入しておけば、焼付け工程において塗料がはじかれ、複数塗料を重ね塗りしなくともハンマートーン調の外観を形成できることを発見し、さらに、連続塗装ラインにおいてもハンマートーン調の外観を安定的に製造するための塗料組成物を開発するに至り本願発明を完成させたもので、その主旨とするところは以下の通りである。
【０００６】
(1) 金属板の片面または両面にある、下層のプライマー層と上層のトップ層とからなるプレコート層において、プライマー層が、ガラス転移温度が50℃〜80℃で数平均分子量が5000〜15000のポリエステル樹脂Aと、ガラス転移温度が10℃〜40℃で数平均分子量が15000〜25000のポリエステル樹脂Bと、架橋剤としてアミノ樹脂またはイソシアネート化合物を含む塗料組成物Aを塗装焼付けしてなり、かつ、トップ層が、ガラス転移温度が50℃〜80℃で数平均分子量が5000〜20000のポリエステル樹脂Cと、架橋剤としてアミノ樹脂またはイソシアネート化合物を含む塗料組成物Bおよび塗料組成物Bの乾燥重量に対して0.1〜2.0重量%の熱溶融性樹脂微粒子からなり、当該熱溶融性樹脂微粒子が、溶融状態の表面張力において前記塗料組成物Bと異なり、かつ、塗料の焼付け過程で溶融するものを塗装焼付けしてなることを特徴とするハンマートーン調の外観を有するプレコート金属板。
【０００７】
（２）上記塗料組成物Ａが、ポリエステル樹脂Ａ：１００重量部に対し、ポリエステル樹脂Ｂ：２００〜３００重量部、架橋剤としてアミノ樹脂またはイソシアネート化合物：７０〜１００重量部と、以上３成分を合わせた合計１００重量部に対し、１種以上の顔料：顔料の合計で１〜２０重量部と、粒径１００μｍ以下のアルミ粉：１〜５重量部を含むことを特徴とする前記（１）に記載のハンマートーン調プレコート金属板。
【０００８】
（３）上記塗料組成物Ｂが、ポリエステル樹脂Ｃ：１００重量部に対し、架橋剤としてアミノ樹脂またはイソシアネート化合物：１０〜４０重量部と、以上２成分を合わせた合計１００重量部に対し、１種以上の顔料：顔料の合計で１〜１０重量部と、粒径１００μｍ以下のアルミ粉：１〜５重量部を含むことを特徴とする前記（１）または（２）に記載のハンマートーン調プレコート金属板。
【０００９】
【発明の実施の形態】
本発明のプレコート金属板は、トップ層の主成分たる樹脂組成物Ｂに、樹脂組成物Ｂと表面張力が異なり、塗料の焼付け過程で溶融する熱溶融性樹脂微粒子を含ませ、トップ層の焼付け過程で、熱溶融性樹脂微粒子が溶融し、樹脂組成物Ｂをはじくことによって凹部を生じさせることにより、ハンマートーン調外観を得るものである。したがって、本願発明において熱溶融性樹脂微粒子の含有量は本質的に重要で、塗料組成物Ｂの乾燥重量に対して、０．１〜２．０％である必要がある。０．１％未満であると凹部が現れず、含有量が２．０％を越えると樹脂組成物Ｂがはじかれ過ぎて逆に凹部ばかりで凹凸感が小さくなり、いずれの場合も、ハンマートーン調外観に適さない。熱溶融性樹脂微粒子の樹脂の選択は当業者には容易である。
【００１０】
熱溶融性樹脂微粒子として用いる樹脂は、表面張力が塗料組成物Ｂと異なり、かつ塗料の焼付け過程で溶融する樹脂であればよく、その選択は当業者には容易であるが、例えば、ポリエチレン系樹脂、ポリプロピレン系樹脂、ポリアミド系樹脂、アクリル樹脂、フッ素樹脂などを例示することができる。熱溶融性樹脂微粒子の粒径は、特に限定されるわけではないが、一般に５〜６０μｍの範囲内でよい。５μｍ未満では、凹凸感が小さくハンマートーン調外観に相応しくなく、一方６０μｍ超では、表面がなだらかになり、これもハンマートーン調に相応しくないからである。
【００１１】
本発明における熱溶融樹脂微粒子の表面張力は溶融した樹脂微粒子を鋼板上に平に延ばした後、固まった平らな樹脂上に純水を滴下したときの樹脂と純水の接触角、すなわち、純水に対する濡れ性を測定し、比較した。熱溶融樹脂微粒子は、この方法で測った表面張力が塗料組成物Ｂと異なっており、トップ層焼付け温度にて溶融すれば良く、材質においてこれ以上に限定するものではない。
【００１２】
トップ層の主成分たる樹脂組成物Ｂは、ガラス転移温度が５０℃〜８０℃で数平均分子量が５０００〜２００００のポリエステル樹脂Ｃと架橋剤としてアミノ樹脂またはイソシアネート化合物を含むものを適用する。ポリエステル樹脂Ｃ１００重量部に対し、架橋剤としてアミノ樹脂またはイソシアネート化合物を１０〜４０重量部添加すると、塗膜の硬度と加工性のバランスが良くより好適である。さらに、樹脂組成物Ｂが、ポリエステル樹脂Ｃと架橋剤の合計１００重量部に対し、１種以上の顔料を合計で１〜１０重量部と、粒径１００μｍ以下のアルミ粉を１〜５重量部を含むことによって非常にハンマートーン調らしい外観となり、最適である。架橋剤としてのアミノ樹脂、イソシアネート化合物は一般に公知のもの、例えばメラミン樹脂、ベンゾグアナミン樹脂、尿素樹脂、ブロックイソシアネートなどを使用することができる。顔料は一般に公知の着色顔料、例えば酸化チタン、フタロシアニンブルー、カーボン、ストロンチウムクロメートなどを使用することが可能である。
【００１３】
次に、トップ層に対して下地となるプライマー層をなす樹脂組成物Ａは、ガラス転移点が５０℃〜８０℃で数平均分子量が５０００〜１５０００のポリエステル樹脂Ａと、ガラス転移点が１０℃〜４０℃で数平均分子量が１５０００〜２５０００のポリエステル樹脂Ｂと、架橋剤としてアミノ樹脂またはイソシアネート化合物とを含むものを適用する。これにより塗膜硬度と塗膜加工性のバランスが保つことができる。この際、ポリエステル樹脂Ａ１００重量部に対し、ポリエステル樹脂Ｂを２００〜３００重量部、架橋剤としてアミノ樹脂またはイソシアネート化合物を７０〜１００重量部含ませると塗膜硬度、加工性が共に良くより好適である。さらに、樹脂組成物Ａが、ポリエステル樹脂Ａ、Ｂと架橋剤の合計１００重量部に対し、１種以上の顔料を合計で１〜２０重量部と、粒径１００μｍ以下のアルミ粉を１〜５重量部を含むことによって非常にハンマートーン調らしい外観となり、最適である。架橋剤としてのアミノ樹脂、イソシアネート化合物は一般に公知のもの、例えばメラミン樹脂、ベンゾグアナミン樹脂、尿素樹脂、ブロックイソシアネートなどを使用することができる。顔料は一般に公知の着色顔料、例えば酸化チタン、フタロシアニンブルー、カーボン、ストロンチウムクロメートなどを使用することが可能である。
【００１４】
塗料組成物ＡおよびＢに適用する溶剤は、一般的に公知の溶剤、例えばソルベッソ１５０、キシレン、シクロヘキサノン等を用いることができる。
本発明のハンマートーン調プレコート金属板は、塗料組成物Ａおよび熱溶融性樹脂微粒子を混入した塗料組成物Ｂを順次塗装焼付けして完成されるが、焼付け温度は選択された材料に最適な温度を選べば良く、製造プロセスは従来のプレコート金属板の場合に比べて特に製造条件の制限を与えるものではない。また、適用する金属板に関しても、冷延鋼板や亜鉛めっき鋼板などの表面処理鋼板や、その他の金属薄板など、特に制約するものではない。必要があれば、金属板上にクロメート処理等の化成処理を施してプレコート金属板用に供することも可能である。
【００１５】
【実施例】
（実施例１〜１０）
溶融亜鉛めっき鋼板上に化成処理として塗布型クロメートをＣｒ付着量５０ｍｇ／ｍ2 付着させ、その上にプライマー層を乾燥膜厚にして５μｍロールコーターにて塗装し、最高到達板温２１０℃で焼付け、さらに、その上にトップ層を乾燥膜厚にして１５μｍロールコーターにて塗装し、最高到達板温２３０℃で焼付けることによってプレコート金属板を製造した。
【００１６】
プライマー層にはガラス転移点５５℃で平均分子量５０００のポリエステル樹脂Ａを１００重量部に対し、ガラス転移温度１３℃で平均分子量が１５０００のポリエステル樹脂Ｂを２５０重量部、架橋剤としてメラミン樹脂を８０重量部配合したものを用い、トップ層にはガラス転移温度５５℃で平均分子量が５０００のポリエステル樹脂Ｃを１００重量部に対して、架橋剤としてメラミン樹脂を２０重量部配合したものに、熱溶融性樹脂微粒子を添加したものを用いた。熱溶融性樹脂微粒子の添加量は表１に示す。
【００１７】
製造した塗装金属板のハンマートーン調外観を目視にて観察し、ハンマートーン調外観として最も相応しい外観を◎、相応しい外観を○、あまり相応しくない外観を△、最も相応しくない外観を×として評価した。
表１から明らかなように、トップ層の熱溶融性樹脂微粒子の添加量は０．１〜２．０重量％が最も好適であり（実施例２〜４）、０．１重量％未満では均一なハンマートーン外観がでなく、２．０重量％超では凹凸感が小さくハンマートーン調外観に相応しくない（実施例１，５）ことがわかる。
【００１８】
熱溶融性樹脂微粒子の種類はトップ層との接触角が異なり、添加量が適量であればいずれもハンマートーン調として相応しい外観になる（実施例６，７，９）。しかし、実施例８のように熱硬化性樹脂や、実施例１０のように樹脂の融点が高くトップ層焼付け過程で樹脂微粒子が溶融しないものはハンマートーン調外観がでないことが確認された。
【００１９】
【表１】
（実施例１１〜２９）
溶融亜鉛めっき鋼板上に化成処理として塗布型クロメートをＣｒ付着量５０ｍｇ／ｍ2 付着させ、その上にプライマー層を乾燥膜厚にして５μｍロールコーターにて塗装し、最高到達板温２１０℃で焼付け、さらにその上にトップ層を乾燥膜厚にして１５μｍロールコーターにて塗装し、最高到達板温２３０℃で焼付けることによってプレコート金属板を製造した。
【００２１】
プライマー層にはガラス転移点５５℃で平均分子量５０００のポリエステル樹脂Ａとガラス転移温度１３℃で平均分子量が１５０００のポリエステル樹脂Ｂと架橋剤としてメラミン樹脂を表２に示した量で配合したものに、顔料とアルミ粉を表２に示す量を添加したものを用いた。ここで、顔料はカーボンを使用した。顔料およびアルミ粉の添加量はポリエステル樹脂Ａとポリエステル樹脂Ｂと架橋剤を合わせた合計１００重量部に対する量を表示した。また、トップ層にはガラス転移温度５５℃で平均分子量が５０００のポリエステル樹脂Ｃを１００重量部に対して、架橋剤としてメラミン樹脂を２０重量部配合したものに、熱溶融性樹脂微粒子を１．０重量％、アルミ粉を３．０重量％添加したものを用いた。
【００２２】
製造した塗装金属板は加工性試験と鉛筆硬度試験とハンマートーン外観観察を行った。加工性試験は耐屈曲性試験（ＪＩＳ−Ｋ５４００．６．１６）を実施した。この際、折り曲げられた板と板の間に同板を挟み込み、塗膜に亀裂の入らない最小板挟み枚数を表示した。例えば０Ｔは密着曲げ、１Ｔは板挟み枚数１枚を表す。鉛筆硬度試験は鉛筆引っ掻き試験（ＪＩＳ−Ｋ５４００．６．１４）を実施し、傷の入らない最低鉛筆硬度記号を表示した。ハンマートーン調外観は実施例１〜１０で実施した観察評価と同様に評価した。
【００２３】
表２から明らかなようにプライマー層はポリエステル樹脂Ａ１００重量部に対してポリエステル樹脂Ｂを２００〜３００重量部が好適であり（実施例１２〜１４）、２００重量部未満であると加工性が悪くなり（実施例１１）、３００重量部超であると塗膜硬度が柔らかくなってしまう（実施例１５）。また、プライマー層の架橋剤の配合量はポリエステル樹脂Ａに対して７０〜１００重量部が好適であり（実施例１７，１８）、７０重量部未満では塗膜硬度が柔らかく（実施例１６）、１００重量部超では加工性が悪くなる（実施例１９）。プライマー層の顔料添加量はポリエステル樹脂Ａとポリエステル樹脂Ｂと架橋剤を合わせた合計１００重量部に対して１．０〜２０．０重量部添加すると好適であり（実施例２１〜２３）、１．０重量部未満（実施例２０）もしくは２０．０重量部超（実施例２４）では色調に深みが足りない。プライマー層のアルミ粉の添加量は１．０〜５．０重量部が好適であり（実施例２６〜２８）、１．０重量部未満（実施例２５）もしくは５．０重量部超（実施例２９）では色調が、ハンマートーン調の外観には適さない。
【００２４】
【表２】
（実施例３０〜４５）
溶融亜鉛めっき鋼板上に化成処理として塗布型クロメートをＣｒ付着量５０ｍｇ／ｍ2 付着させ、その上にプライマー層を乾燥膜厚にして５μｍロールコーターにて塗装し、最高到達板温２１０℃で焼付け、さらにその上にトップ層を乾燥膜厚にして１５μｍ塗装し、最高到達板温２３０℃で焼付けてることによってプレコート金属板を製造した。
【００２６】
プライマー層にはガラス転移点５５℃で平均分子量５０００のポリエステル樹脂Ａを１００重量部に対し、ガラス転移温度１３℃で平均分子量が１５０００のポリエステル樹脂Ｂを２５０重量部、架橋剤としてメラミン樹脂を８０重量部配合したものを用い、トップ層にはガラス転移温度５５℃で平均分子量が５０００のポリエステル樹脂Ｃを１００重量部に対して、架橋剤としてメラミン樹脂を表３に示す量を配合したものに、熱溶融性樹脂微粒子を１．０重量％添加し、顔料およびアルミ粉の添加量を表３に示す量添加したものを用いた。
【００２７】
表３から明らかなようにトップ層にガラス転移温度５５℃で平均分子量が５０００のポリエステル樹脂Ｃを１００重量部に対して、架橋剤としてメラミン樹脂を１０〜４０重量部配合したものが好適であり（実施例３１〜３４）、配合量１０重量部未満であると塗膜硬度が柔らかく（実施例３０）、４０重量部超であると加工性が悪い（実施例３５）。また、顔料の添加量は１．０〜１０．０重量部添加したものが好適であり（実施例３７〜３９）、顔料添加量が１．０重量部未満（実施例３６）もしくは１０．０超（実施例４０）であると色調に深みが無い。また、アルミ粉の添加量は１．０〜５．０重量部が最も好適であり（実施例４２〜４４）、１．０重量部未満（実施例４１）もしくは５．０重量部超（実施例４５）では色調が、ハンマートーン調の外観には適さない。
【００２８】
【表３】
【発明の効果】
本発明のハンマートーン調プレコート金属板は、連続塗装ラインにて安定的に製造可能で、美しいハンマートーン調の外観をもつプレコート金属板を低コストにて提供することが可能となった。したがって、本発明は工業的に非常に価値の高い発明といえる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pre-coated metal plate having a hammer tone-like appearance, which is used for a portion requiring high design as an outer plate of home appliances, furniture, building materials, automobile parts and the like.
[0002]
[Prior art]
For the purpose of omitting the painting process after processing and assembling as exterior panels for home appliances, furniture, building materials, and automobile parts, the application of pre-coated metal sheets has become popular. A roll coater, a curtain flow coater, and a roller curtain coater are mentioned as a manufacturing method of a precoat metal plate, and it is manufactured with the continuous coating line which can be mainly coil-coated for the purpose of mass production.
[0003]
In the pre-coated metal plate, there is a strong demand for a design appearance in order to give a high-class feeling to the product, particularly in the fields of home appliances, furniture, building materials and automobile parts. In recent years, the demand for these design appearances has increased, and in particular, the demand for hammer tone-like appearance has increased. Hammer tone tone is a paint that creates a pattern with a feeling of unevenness as if the metal surface was struck with a hammer, using a paint that produces shades depending on the coating thickness. Although it has only been used, in recent years its high-class feeling has been reviewed, and the demand for hammer-tone precoated metal sheets is increasing. In view of such market conditions, as a method for producing a hammer-tone precoated metal sheet, Japanese Patent Application Laid-Open No. 8-216331 discloses that an intermediate coating is applied on an undercoat layer and the intermediate coating is not dried before the intermediate coating is dried. A technique for producing a hammer tone pattern by spraying a top coat paint that is compatible with a paint and has a surface tension smaller than that of an intermediate paint is disclosed. However, when manufactured in a continuous coating line, it is extremely difficult to spray the top coat with good reproducibility, it is difficult to stably produce a beautiful appearance, and it is sprayed in addition to conventional roll coat and curtain coat equipment. Since a painting facility is required, the manufacturing cost is high, which is not always a sufficient method.
[0004]
[Problems to be solved by the invention]
In view of the above situation, an object of the present invention is to provide a hammer-tone precoated metal sheet that can be stably manufactured in a continuous coating line and that has excellent coating film hardness and coating film processability.
[0005]
[Means for Solving the Problems]
As a result of intensive studies, the inventors have mixed heat-melting resin fine particles with different surface tensions into the paint, so that the paint will be repelled in the baking process, and a hammer-tone-like appearance can be achieved without multiple coatings. The present invention has been completed by developing a coating composition for stably producing a hammer tone-like appearance even in a continuous painting line. It is as follows.
[0006]
(1) In a precoat layer consisting of a lower primer layer and an upper top layer on one or both sides of a metal plate, the primer layer has a glass transition temperature of 50 ° C to 80 ° C and a number average molecular weight of 5000 to 15000. A polyester resin A, a glass transition temperature of 10 ° C. to 40 ° C., a polyester resin B having a number average molecular weight of 15000 to 25000, and a coating composition A containing an amino resin or an isocyanate compound as a cross-linking agent; The dry weight of the coating composition B and the coating composition B, in which the top layer includes a polyester resin C having a glass transition temperature of 50 ° C. to 80 ° C. and a number average molecular weight of 5000 to 20000, and an amino resin or an isocyanate compound as a crosslinking agent 0.1% to 2.0% by weight of the heat-meltable resin fine particles, the heat-meltable resin fine particles differ from the paint composition B in the surface tension in the molten state, and the paint is baked. A pre-coated metal plate having a hammer tone-like appearance, which is obtained by painting and baking a material that melts in the melting process.
[0007]
(2) The coating composition A is polyester resin A: 100 parts by weight, polyester resin B: 200 to 300 parts by weight, amino resin or isocyanate compound as a crosslinking agent: 70 to 100 parts by weight, and the above three components. 1 to 20 parts by weight in total of one or more pigments: pigments and 1 to 5 parts by weight of aluminum powder having a particle size of 100 μm or less, based on 100 parts by weight in total (1) A hammer-tone pre-coated metal plate as described in 1.
[0008]
(3) The coating composition B is 100 parts by weight of the polyester resin C: 100 parts by weight of the amino resin or isocyanate compound as a crosslinking agent: 10 to 40 parts by weight, Hammer tone tone according to (1) or (2) above, comprising 1 to 10 parts by weight of a total of pigments of at least seeds: 1 to 5 parts by weight of aluminum powder having a particle size of 100 μm or less Pre-coated metal plate.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The pre-coated metal sheet of the present invention includes a resin composition B, which is a main component of the top layer, containing heat-meltable resin fine particles that are different in surface tension from the resin composition B and melt in the baking process of the paint. In the process, the heat-meltable resin fine particles are melted, and the resin composition B is repelled to form a recess, thereby obtaining a hammer tone-like appearance. Therefore, in the present invention, the content of the heat-meltable resin fine particles is essentially important and needs to be 0.1 to 2.0% with respect to the dry weight of the coating composition B. When the content is less than 0.1%, no recess appears, and when the content exceeds 2.0%, the resin composition B is repelled too much, and conversely, the recess / concavity is reduced. Not suitable for toned appearance. Selection of the resin of the heat-meltable resin fine particles is easy for those skilled in the art.
[0010]
The resin used as the heat-meltable resin fine particles may be any resin as long as it has a surface tension different from that of the coating composition B and melts during the baking process of the coating. Examples thereof include resins, polypropylene resins, polyamide resins, acrylic resins, fluororesins, and the like. The particle diameter of the heat-meltable resin fine particles is not particularly limited, but generally may be in the range of 5 to 60 μm. If it is less than 5 μm, the unevenness is small and it is not suitable for the hammer tone appearance, whereas if it exceeds 60 μm, the surface becomes smooth and this is not suitable for the hammer tone effect.
[0011]
The surface tension of the hot-melt resin fine particles in the present invention is the contact angle of the resin and pure water when pure water is dropped on the solid flat resin after the molten resin fine particles are spread flat on the steel plate, ie, pure The wettability with water was measured and compared. The hot-melt resin fine particles have a surface tension measured by this method different from that of the coating composition B, and may be melted at the top layer baking temperature, and the material is not limited to this.
[0012]
As the resin composition B as the main component of the top layer, a resin composition B having a glass transition temperature of 50 ° C. to 80 ° C. and a number average molecular weight of 5000 to 20000 and an amino resin or isocyanate compound as a crosslinking agent is applied. When 10 to 40 parts by weight of an amino resin or an isocyanate compound is added as a crosslinking agent to 100 parts by weight of the polyester resin C, the balance between the hardness of the coating film and the workability is better. Furthermore, the resin composition B has a total of 1 to 10 parts by weight of one or more pigments and 1 to 5 parts by weight of aluminum powder having a particle size of 100 μm or less with respect to a total of 100 parts by weight of the polyester resin C and the crosslinking agent. The appearance is very hammer tone-like, and is optimal. As the cross-linking agent, generally known amino resins and isocyanate compounds such as melamine resins, benzoguanamine resins, urea resins, and blocked isocyanates can be used. As the pigment, generally known color pigments such as titanium oxide, phthalocyanine blue, carbon, strontium chromate and the like can be used.
[0013]
Next, the resin composition A that forms the primer layer as a base with respect to the top layer has a glass transition point of 50 ° C. to 80 ° C. and a polyester resin A having a number average molecular weight of 5000 to 15000, and a glass transition point of 10 ° C. A polyester resin B having a number average molecular weight of 15,000 to 25000 at -40 ° C and an amino resin or an isocyanate compound as a crosslinking agent is applied. Thereby, the balance between coating film hardness and coating film processability can be maintained. In this case, when the polyester resin A is contained in an amount of 200 to 300 parts by weight and the amino resin or isocyanate compound is contained in an amount of 70 to 100 parts by weight as a cross-linking agent, the coating film hardness and processability are both better and more suitable. is there. Furthermore, the resin composition A has a total of 1 to 20 parts by weight of one or more pigments and 1 to 5 parts of aluminum powder having a particle size of 100 μm or less, based on 100 parts by weight of the polyester resins A and B and the crosslinking agent. By including the weight part, it has a very hammer tone-like appearance and is optimal. As the cross-linking agent, generally known amino resins and isocyanate compounds such as melamine resins, benzoguanamine resins, urea resins, and blocked isocyanates can be used. As the pigment, generally known color pigments such as titanium oxide, phthalocyanine blue, carbon, strontium chromate and the like can be used.
[0014]
As the solvent applied to the coating compositions A and B, generally known solvents such as Solvesso 150, xylene, cyclohexanone and the like can be used.
The hammer-tone precoated metal sheet of the present invention is completed by sequentially coating and baking the coating composition A and the coating composition B mixed with the heat-meltable resin fine particles, and the baking temperature is the optimum temperature for the selected material. The manufacturing process does not limit the manufacturing conditions as compared with the case of the conventional precoated metal sheet. Further, the metal plate to be applied is not particularly limited, such as a surface-treated steel plate such as a cold-rolled steel plate and a galvanized steel plate, and other metal thin plates. If necessary, the metal plate can be subjected to a chemical conversion treatment such as chromate treatment and used for a pre-coated metal plate.
[0015]
【Example】
(Examples 1 to 10)
As a chemical conversion treatment, a coating-type chromate is deposited on the hot-dip galvanized steel sheet with a Cr coating amount of 50 mg / m 2 , and the primer layer is coated with a 5 μm roll coater with a dry film thickness and baked at a maximum plate temperature of 210 ° C. Further, a precoat metal plate was manufactured by coating the top layer with a dry film thickness on a 15 μm roll coater and baking at a maximum reached plate temperature of 230 ° C.
[0016]
For the primer layer, 100 parts by weight of polyester resin A having a glass transition temperature of 55 ° C. and an average molecular weight of 5000, 250 parts by weight of polyester resin B having a glass transition temperature of 13 ° C. and an average molecular weight of 15000, and 80 parts of melamine resin as a crosslinking agent. Using a blended part by weight, the top layer is blended with 100 parts by weight of a polyester resin C having a glass transition temperature of 55 ° C. and an average molecular weight of 5000, and 20 parts by weight of a melamine resin as a crosslinking agent. Used was a resin to which conductive resin fine particles were added. The amount of the heat-meltable resin fine particles added is shown in Table 1.
[0017]
The hammer-tone appearance of the manufactured coated metal plate was visually observed, and the most appropriate appearance as a hammer-tone-like appearance was evaluated as 相 応, the appropriate appearance as ◯, the appearance that was not very suitable as △, and the appearance that was not suitable as ×.
As is apparent from Table 1, the amount of the top layer heat-meltable resin fine particles added is most preferably 0.1 to 2.0% by weight (Examples 2 to 4), and uniform when the amount is less than 0.1% by weight. It can be seen that the hammer tone appearance is not good, and if it exceeds 2.0% by weight, the unevenness is small and the hammer tone appearance is not suitable (Examples 1 and 5).
[0018]
The kind of the heat-meltable resin fine particles has a different contact angle with the top layer, and if the addition amount is an appropriate amount, any of them has a suitable appearance as a hammer tone (Examples 6, 7, and 9). However, it was confirmed that the thermosetting resin as in Example 8 and the resin whose melting point of the resin is high and the resin fine particles do not melt in the top layer baking process as in Example 10 does not have a hammer tone-like appearance.
[0019]
[Table 1]
(Examples 11 to 29)
As a chemical conversion treatment, a coating-type chromate is deposited on the hot dip galvanized steel sheet with a Cr coating amount of 50 mg / m 2 , and the primer layer is coated with a 5 μm roll coater with a dry film thickness, and baked at a maximum plate temperature of 210 ° C. Further, a precoat metal plate was manufactured by coating the top layer with a dry film thickness with a 15 μm roll coater and baking at a maximum reached plate temperature of 230 ° C.
[0021]
In the primer layer, a polyester resin A having a glass transition temperature of 55 ° C. and an average molecular weight of 5000, a polyester resin B having a glass transition temperature of 13 ° C. and an average molecular weight of 15000, and a melamine resin as a crosslinking agent in the amounts shown in Table 2 The pigment and aluminum powder added in the amounts shown in Table 2 were used. Here, carbon was used as the pigment. The addition amount of the pigment and the aluminum powder is expressed in an amount based on 100 parts by weight of the total of the polyester resin A, the polyester resin B, and the crosslinking agent. The top layer was blended with polyester resin C having a glass transition temperature of 55 ° C. and an average molecular weight of 5000 with 100 parts by weight and 20 parts by weight of melamine resin as a crosslinking agent, and 1. What added 0 weight% and aluminum powder 3.0 weight% was used.
[0022]
The manufactured coated metal plate was subjected to workability test, pencil hardness test, and hammer tone appearance observation. As the workability test, a bending resistance test (JIS-K5400.6.16) was performed. At this time, the same plate was sandwiched between the folded plates, and the minimum number of plates sandwiched without cracks in the coating film was displayed. For example, 0T represents close contact bending, and 1T represents one sheet sandwiched sheet. As the pencil hardness test, a pencil scratch test (JIS-K5400.6.14) was performed, and the lowest pencil hardness symbol without any scratches was displayed. The hammer tone appearance was evaluated in the same manner as the observation evaluation performed in Examples 1-10.
[0023]
As is apparent from Table 2, the primer layer is preferably 200 to 300 parts by weight of the polyester resin B with respect to 100 parts by weight of the polyester resin A (Examples 12 to 14). (Example 11) When it exceeds 300 parts by weight, the coating film hardness becomes soft (Example 15). Further, the blending amount of the crosslinking agent in the primer layer is preferably 70 to 100 parts by weight with respect to the polyester resin A (Examples 17 and 18), and the coating film hardness is soft at less than 70 parts by weight (Example 16). If it exceeds 100 parts by weight, workability will be poor (Example 19). The amount of pigment added to the primer layer is preferably 1.0 to 20.0 parts by weight with respect to 100 parts by weight in total of the polyester resin A, the polyester resin B and the crosslinking agent (Examples 21 to 23). Less than 0.0 part by weight (Example 20) or more than 20.0 parts by weight (Example 24), the color tone is not deep enough. The amount of the aluminum powder added to the primer layer is preferably 1.0 to 5.0 parts by weight (Examples 26 to 28), less than 1.0 part by weight (Example 25) or more than 5.0 parts by weight (implemented). In Example 29), the color tone is not suitable for the appearance of a hammer tone tone.
[0024]
[Table 2]
(Examples 30 to 45)
As a chemical conversion treatment, a coating-type chromate is deposited on the hot dip galvanized steel sheet with a Cr coating amount of 50 mg / m 2 , and the primer layer is coated with a 5 μm roll coater with a dry film thickness, and baked at a maximum plate temperature of 210 ° C. Further, a precoat metal plate was manufactured by coating the top layer with a dry film thickness of 15 μm thereon and baking it at a maximum plate temperature of 230 ° C.
[0026]
For the primer layer, 100 parts by weight of polyester resin A having an average molecular weight of 5000 at a glass transition temperature of 55 ° C., 250 parts by weight of polyester resin B having an average molecular weight of 15000 at a glass transition temperature of 13 ° C., and 80 parts of melamine resin as a crosslinking agent. The top layer is blended with 100 parts by weight of a polyester resin C having a glass transition temperature of 55 ° C. and an average molecular weight of 5000 at the glass transition temperature of 55 ° C., and with the amount shown in Table 3 as the crosslinking agent. Then, 1.0% by weight of heat-meltable resin fine particles were added, and the amount of pigment and aluminum powder added as shown in Table 3 was used.
[0027]
As apparent from Table 3, it is preferable that the top layer is blended with 10 to 40 parts by weight of a melamine resin as a crosslinking agent with respect to 100 parts by weight of polyester resin C having a glass transition temperature of 55 ° C. and an average molecular weight of 5000. (Examples 31 to 34) When the blending amount is less than 10 parts by weight, the coating film hardness is soft (Example 30), and when it exceeds 40 parts by weight, the processability is poor (Example 35). Further, the addition amount of the pigment is preferably 1.0 to 10.0 parts by weight (Examples 37 to 39), and the addition amount of the pigment is less than 1.0 parts by weight (Example 36) or 10.0. If it is super (Example 40), there is no depth in color tone. The addition amount of aluminum powder is most preferably 1.0 to 5.0 parts by weight (Examples 42 to 44), less than 1.0 part by weight (Example 41) or more than 5.0 parts by weight (implementation). In Example 45), the color tone is not suitable for the appearance of a hammer tone tone.
[0028]
[Table 3]
【The invention's effect】
The hammer-tone pre-coated metal plate of the present invention can be stably manufactured on a continuous coating line, and a pre-coated metal plate having a beautiful hammer-tone-like appearance can be provided at a low cost. Therefore, the present invention can be said to be an industrially very valuable invention.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22250697A JP3650511B2 (en) | 1997-08-19 | 1997-08-19 | Hammer tone pre-coated metal plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22250697A JP3650511B2 (en) | 1997-08-19 | 1997-08-19 | Hammer tone pre-coated metal plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1157607A JPH1157607A (en) | 1999-03-02 |
| JP3650511B2 true JP3650511B2 (en) | 2005-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22250697A Expired - Fee Related JP3650511B2 (en) | 1997-08-19 | 1997-08-19 | Hammer tone pre-coated metal plate |
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| JP4608233B2 (en) * | 2004-04-02 | 2011-01-12 | 株式会社神戸製鋼所 | Undercoating composition for production of non-chromate pre-coated metal sheet for forming uneven pattern, and non-chromate pre-coated metal sheet |
| MY157832A (en) * | 2008-12-03 | 2016-07-29 | Nippon Steel Corp | Coated metal material and method of production of same |
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