JP2004142164A - Decorative metal plate - Google Patents

Decorative metal plate Download PDF

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Publication number
JP2004142164A
JP2004142164A JP2002307510A JP2002307510A JP2004142164A JP 2004142164 A JP2004142164 A JP 2004142164A JP 2002307510 A JP2002307510 A JP 2002307510A JP 2002307510 A JP2002307510 A JP 2002307510A JP 2004142164 A JP2004142164 A JP 2004142164A
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Japan
Prior art keywords
acrylic resin
metal plate
layer
decorative metal
resin layer
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.)
Pending
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JP2002307510A
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Japanese (ja)
Inventor
Tokuaki Kakuma
加隈 徳昭
Motohiro Tomomori
友森 基裕
Koji Taguma
田熊 幸治
Masanori Tanigami
谷上 雅則
Takushi Nakamura
中村 琢司
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Toyo Kohan Co Ltd
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Toyo Kohan Co Ltd
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Priority to JP2002307510A priority Critical patent/JP2004142164A/en
Publication of JP2004142164A publication Critical patent/JP2004142164A/en
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  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative metal plate which is applied as an outdoor building material such as a roof material, a wall material, a door or the like adapted to the outside of a building or an indoor building material such as a wall material, a partition material, a door or the like, prevents the adverse influence on environment due to the generation of a toxic substance such as dioxins or the like or a pollutant such as hydrogen chloride or the like at the time of incineration and disposal and has excellent bending workability, design properties, design durability and weatherability. <P>SOLUTION: The decorative metal plate includes a multilayer resin film made by sequentially laminating a transparent acrylic resin layer made of an acrylic resin obtained by blending an acrylic resin of 0-40 wt% with an acrylic rubber of 60-100 wt%, a print layer and a colored acrylic resin layer formed by adding a color pigment to the transparent acrylic resin from a surface layer side and is obtained by laminating this multilayer resin film on at least one side surface of a metal plate through an adhesive layer. The design properties of this metal plate are enhanced by applying emboss processing to the transparent acrylic resin layer selectively to provide fine recessed parts. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、金属板にアクリル樹脂を被覆してなり、特に耐候性および意匠性に優れた化粧金属板に関する。
【0002】
【従来の技術】
従来より、建物外部の屋根材、壁材、ドアなどの屋外建材や、建物内部の壁材、仕切材、ドアなどの屋外建材として、金属板にポリ塩化ビニル樹脂を被覆してなる被覆金属板が用いられていた。しかるに昨今、不要となったこれらのポリ塩化ビニル樹脂被覆金属板を焼却廃棄する際にダイオキシンなどの有毒物や塩化水素などの汚染物質が発生して環境に悪影響を与えることから、屋外および屋内の建材用途に、以下に示すようなポリ塩化ビニル樹脂被覆金属板に替わる樹脂被覆金属板が求められている。
【0003】
また、これらの用途、例えばドア等に成形加工するために樹脂被覆金属板に曲げ加工を施した際に、樹脂層にクラックが入ることのない優れた加工性が求められるが、さらに、色調、模様、表面の光沢などの意匠性に加えて、石目や木目を模した凹部や、幾何学模様の凹部などの様々な微小な凹部をエンボス加工により形成させてなるエンボス加工性も求められ、被覆樹脂層がそれらの曲げ加工性、意匠性、エンボス加工性、および屋外に用いた場合に優れた耐候性が得られるような樹脂で構成されていることが求められる。
【0004】
これらの様々な要求に応えるべく、様々な樹脂被覆金属板が提案されている。従来技術として、ヘイズ度が1〜8%で、光透過率が波長400〜700nmの範囲で70%以上ある透明な第2の熱可塑性樹脂層(二軸延伸ポリエチレンテレフタレートフィルム)に印刷層を形成し、第2の接着剤層を介して透明な第1の熱可塑性樹脂層(PVCフィルム)を積層した化粧シートを、着色した第1の接着剤層を形成した金属板に貼り合わせて積層金属板を開示している(例えば特許文献1参照。)。この樹脂被覆金属板においては、積層金属板の最表面となる樹脂表面に凹部を形成させることを考慮していないため、最表層用の樹脂として透明性に優れた二軸延伸ポリエチレンテレフタレートフィルムを用いているが、二軸延伸フィルムはエンボス加工を施して凹部を形成させることが極めて困難であり、化粧金属板の最表面となる樹脂層に凹部を形成させる本発明に適用することはできない。
【0005】
また、アクリル樹脂中にゴム含有重合体粒子が5〜25重量%分散したアクリル樹脂組成物を金属板に積層したアクリル化粧金属板を開示している(例えば特許文献2参照。)。このアクリル化粧金属板においてはアクリル樹脂中に含有させる弾性体のゴム粒子の量が少ないために、曲げ加工を施した際に樹脂層にクラックが入りやすく、本発明に適用することはできない。
【0006】
更に、基材樹脂層としてポリブチレンテレフタレートフィルムを用い、表面樹脂層としてアクリルゴム成分を60〜100%ブレンドしたアクリル樹脂を下から順次積層したフィルムにエンボス加工を施してなる化粧板積層用樹脂フィルムを金属板に積層した高耐候性化粧板を開示している(例えば特許文献3参照。)。この化粧板積層用樹脂フィルムにおいては、基材樹脂層および/または表面樹脂層に着色顔料を混練して着色樹脂層とすることが示唆されているが、模様などを表現する印刷層が設けられておらず、意匠性に乏しい。また、表面樹脂層と基材樹脂層の樹脂層として種類の異なる樹脂層を用いて使い分けているため、本発明におけるように、異なる樹脂層に同一のアクリル樹脂を用いることによるコストメリットが得られない。
【0007】
この出願の発明に関する先行技術文献情報として次のものがある。
【特許文献1】
特開平06−305075号公報
【特許文献2】
特開2000−255003号公報
【特許文献3】
特開2002−059512号公報
【0008】
【発明が解決しようとする課題】
本発明は、建物外部の屋根材、壁材、ドアなどの屋外建材や、建物内部の壁材、仕切材、ドアなどの屋外建材として適用する、焼却廃棄する際にダイオキシンなどの有毒物や塩化水素などの汚染物質が発生して環境に悪影響を与えることのない、優れた曲げ加工性、意匠性、意匠耐久性、および耐候性を有する化粧金属板を提供することを目的とする。
【0009】
【課題を解決するための手段】
上記課題を解決する本発明の化粧金属板は、金属板の少なくとも片面に、表層側から順に、透明アクリル樹脂層、印刷層、着色アクリル樹脂層、接着剤層を形成させてなる化粧金属板、または
金属板の少なくとも片面に、表層側から順に、透明アクリル樹脂層、印刷層、接着剤層、着色アクリル樹脂層、接着剤層を形成させてなる化粧金属板、もしくは、
金属板の少なくとも片面に、表層側から順に、透明アクリル樹脂層、接着剤層、印刷層、着色アクリル樹脂層、接着剤層を形成させてなる化粧金属板のいずれかであり、さらに
透明アクリル樹脂層のJIS K 7105による全光線透過率(以下、単に全光線透過率という)が60%以上であること、また
アクリル樹脂層が、0〜40重量%のアクリル樹脂と60〜100重量%のアクリルゴムをブレンドしてなること、また
透明アクリル樹脂層の表面にエンボス加工による凹部が形成されてなることを特徴とし、またさらに
エンボス加工による凹部は、表面粗さがJIS B 0601による最大高さ(Ry)(以下、単に最大高さ(Ry)という)20〜120μmの深エンボス凹部からなる、または
エンボス加工による凹部は、表面粗さがJIS B 0601による算術平均粗さ(Ra)(以下、単に算術平均粗さ(Ra)という)0.2〜5μmの浅エンボス凹部からなるか、もしくは、
エンボス加工による凹部は、最大高さ(Ry)20〜120μmの深エンボス凹部と、算術平均粗さ(Ra)0.2〜5μmの浅エンボス凹部の両方からなる、あるいは
エンボス加工による凹部は、最大高さ(Ry)20〜120μmの深エンボス凹部と、算術平均粗さ(Ra)5μmを超え10μm以下の浅エンボス凹部の両方からなる、のいずれかであることを特徴とし、さらに
金属板が亜鉛めっき鋼板であることを特徴とする。
【0010】
【発明の実施の形態】
本発明の化粧金属板は、表層側から順に、0〜40重量%のアクリル樹脂と60〜100重量%のアクリルゴムをブレンドしてなるアクリル樹脂からなる透明アクリル樹脂層、印刷層、この透明アクリル樹脂に着色顔料を含有させてなる着色アクリル樹脂層からなる多層樹脂フィルムを、接着剤層を介して金属板の少なくとも片面に積層することにより構成される。石目、木目、幾何学模様の印刷層は透明アクリル樹脂層または着色アクリル樹脂層のいずれかに形成され、これらの樹脂層同士は印刷層を介して、またはさらに接着剤層を設け、印刷層と接着剤層の両方を介して接着される。また、透明アクリル樹脂層の表面にエンボス加工を施して微小な凹部を設け、立体感のある石目、木目、幾何学模様を形成させて意匠性を向上させてもよい。
以下、本発明を詳細に説明する。
【0011】
本発明の建物外部の屋根材、壁材、ドアなどの屋外建材や、建物内部の壁材、仕切材、ドアなどの屋外建材などに用いる化粧金属板の最表面に適用する樹脂としては、前記したように焼却廃棄する際に環境を悪化させる有毒ガスを発生させることがなく、スクラッチなどが生じにくい硬さを有し、かつ透明度の優れた樹脂であることが求められる。このような観点から、本発明においては透明アクリル樹脂、およびこの透明アクリル樹脂に着色顔料を含有させた着色アクリル樹脂を用いる。
【0012】
アクリル樹脂としては、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ブチルなどのホモポリマー、またはこれらの共重合体、またはこれらとアクリル酸、メタクリル酸、アクリル酸メチル、アクリル酸エチル、アクリル酸ブチル、アクリル酸2−エチルヘキシル、メタクリル酸2−エチルヘキシル、アクリル酸ラウリル、メタクリル酸ラウリル、アクリル酸ステアリル、メタクリル酸ステアリル、アクリル酸シクロヘキシル、メタクリル酸シクロヘキシル、アクリル酸ベンジル、メタクリル酸ベンジル、アクリル酸グリシジル、メタクリル酸グリシジル、アクリル酸2−ヒドロキシジエチル、メタクリル酸2−ヒドロキシジエチル、アクリル酸2−ヒドロキシプロピル、メタクリル酸2−ヒドロキシプロピルなどの共重合体を用いることができる。
【0013】
しかし、アクリル樹脂は硬いために加工性に乏しく、これらのアクリル樹脂を被覆した樹脂被覆金属板をドアなどに加工するために曲げ加工を施した場合、曲げ部の曲率半径が小さい場合、樹脂にクラックが生じてしまう。そのため、本発明においてはこれらのアクリル樹脂にアクリルゴムをブレンドすることにより加工性を向上させる。アクリルゴムとしては、エチルアクリレート、プロピルアクリレート、ブチルアクリレート、などのアルキルアクリレート、メトキシエチルアクリレート、エトキシエチルアクリレートなどのアルコキシアルキルアクリレート、メチルチオエチルアクリレートなどのアルコキシルアルキルアクリレート、シアノエチルアクリレートなどのシアノアルキルアクリレートなどの1種または2種以上を主成分とし、これにブタジエン、メチルブタジエン、イソプレン、ピペリレン、1,4−ペンタジエン、メチルペンタジエン、シクロペンタジエン、ジシクロペンタジエン、ビニルシクロペンタジエン、アセトキシブタジエン、メトキシブタジエン、シアノブタジエン、エチリデンノルボルネン、ビニリデンノルボルネン、プロペニルノルボルネン、ジシクロペンタジエニルアクリレートなどのジエン系モノマーの1種または2種以上、またはスチレン、α−メチルスチレン、パラメチルスチレンなどの芳香族ビニル単量体の1種または2種以上を架橋基成分として共重合させてなる共重合体を用いることができる。
【0014】
これらのアクリルゴムは上記のアクリル樹脂に対して60〜100重量%ブレンドされていることが好ましい。ブレンド率が60重量%未満では十分な加工性が得られない。一方、アクリル樹脂を全く含まず、アクリルゴムのみからなる樹脂を用いた場合でも、本発明の目的とする小曲率半径の曲げ加工、必要とされる光透過率および耐候性を有する樹脂フィルムとすることができる。アクリル樹脂は上記のアクリル樹脂に対して40重量%以下であることが好ましい。アクリル樹脂のブレンド率が低いと硬度が低下してスクラッチが生じやすくなる。そのため、耐スクラッチ性が要求される用途においてはアクリル樹脂を3〜40重量%ブレンドして、樹脂の硬度を高めることがより好ましい。
【0015】
このようにして得られる本発明に適用する透明アクリル樹脂層は、全光線透過率が60%以上であることが好ましい。全光線透過率が60%未満であると、透明アクリル樹脂層の下に形成される印刷層の模様や着色アクリル樹脂層の色調の鮮映性に乏しくなる。透明アクリル樹脂層の厚さは10〜100μmであることが好ましい。10μm未満では立体感に乏しい意匠性となり、また、使用条件や使用環境によっては摩耗により透明アクリル樹脂層が失われ、下層である印刷層が露出してしまうことがあり、意匠耐久性に乏しい。一方、100μmを超えても意匠性や意匠耐久性の向上効果が飽和し、コスト的に有利でなくなる。
【0016】
また、本発明に適用する着色アクリル樹脂は、アクリル樹脂にアクリルゴムをブレンドしてなる上記の透明アクリル樹脂に着色顔料を3〜30重量%含有させた樹脂を用いる。含有量は色彩にもよるが、3重量%未満であると美麗な色彩が得られにくく、30重量%を超えると曲げ加工を施した場合に樹脂フィルムにクラックを生じやすくなる。着色顔料として有機系または無機系の白、黒、赤、青、黄、緑、茶などの有色の顔料の1種または2種以上を上記の透明アクリル樹脂に混練し、所望の色の着色アクリル樹脂とすることができる。着色アクリル樹脂層の厚さは30〜200μmであることが好ましい。30μm未満では耐食性が不十分となることがあり、200μmを超えても耐食性の向上効果が飽和し、コスト的に有利でなくなる。
【0017】
本発明においては、上記の透明アクリル樹脂層と着色アクリル樹脂層の間に石目、木目、天然皮革の表面柄、布目、抽象模様、幾何学模様などの印刷層を設ける。この印刷層を設けることにより、印刷層の模様と着色アクリル樹脂層の色彩、および透明樹脂層の厚さの立体感が相俟った、優れた意匠性が得られる。印刷層は透明アクリル樹脂層または着色アクリル樹脂層のいずれかの片面に形成させる。印刷層を形成するインキのビヒクルとしては、例えばニトロセルロース、酢酸セルロース、などのセルロース誘導体、ウレタン樹脂、アクリル樹脂などの公知のものが使用できるが、なかでも密着性および耐熱性の両観点からアクリル樹脂系インキが好ましい。
【0018】
本発明の化粧金属板おいて、上記の樹脂層を積層して被覆する基板となる金属板としては、鋼板、各種のめっき鋼板、アルミニウム合金板、およびこれらに化成処理を施したもの、ステンレス鋼板などを用いることができる。めっき鋼板としては亜鉛めっき鋼板、錫めっき鋼板、アルミニウムめっき鋼板などをあげることができるが、耐食性の観点から、電気亜鉛めっき鋼板、溶融亜鉛めっき鋼板、亜鉛(95%)−アルミニウム(5%)合金の溶融めっき鋼板のいずれかを用いることが好ましい。また、化成処理としては塗布型クロメート処理、リン酸クロメート処理、および6価クロムを含有しない電解クロメート処理、リン酸亜鉛処理などの各種のノンクロム処理を適用することができる。
【0019】
次に、本発明の化粧金属板の形成方法について説明する。図1、図2、図3はそれぞれ本発明の化粧金属板の実施態様の一例を示したものである。
図1に示す化粧金属板は以下のようにして作成される。アクリル樹脂とアクリルゴムをブレンドして加熱溶融し、カレンダー法または押出法を用いて透明アクリル樹脂フィルム1を作成する。次いで透明アクリル樹脂フィルム1の片面に印刷層3を公知の印刷法を用いて形成する。また、透明アクリル樹脂フィルム1と同様の、アクリル樹脂とアクリルゴムからなるブレンド樹脂に着色顔料を混練して加熱溶融し、カレンダー法または押出法を用いて着色アクリル樹脂フィルム2を作成する。ブレンド樹脂に着色顔料を混練する際に、直射日光に長時間暴露された場合の色調の変化を防止するための紫外線吸収剤を含有混練してもよい。このようにして得られる透明アクリル樹脂フィルム1の印刷層3を形成させた面に、熱ラミネート法を用いて着色アクリル樹脂フィルム2を積層し、複層フィルムを作成する。
【0020】
一方、金属板4の片面に接着剤を塗布し乾燥して接着剤層5を形成させる。接着剤としては、酢酸ビニル樹脂系、エチレン−ビニルアセテート樹脂系、尿素樹脂系、ウレタン樹脂系、アクリル樹脂系、ポリエステル樹脂系、ポリエステルウレタン樹脂系などのエマルジョン型接着剤や、エポキシ−フェノール樹脂系などの熱硬化型接着剤を用いることができる。また図示しないが、金属板4の接着剤層5を形成させない面に、ポリエステル系、エポキシ系、アルキド系、メラミン系、尿素樹脂系、ビニル系、ポリアミド系、ポリウレタン系などからなる裏面塗料塗布層を1層もしくは2層以上形成させてもよい。
【0021】
次いで接着剤層5を形成させた金属板4を200〜240℃に加熱し、その接着剤層5を形成させた面に複層フィルムの着色アクリル樹脂フィルム2の面を当接し、1対の積層ロールで挟み付けて熱接着する。次いで180〜230℃に後加熱した後、水中に浸漬して急冷する。なお、後加熱する際にエンボスロールを用いて透明樹脂アクリルフィルム1の表面に深エンボス凹部7を設けてもよい。なお、深エンボス凹部7は図中では透明アクリル樹脂表面にのみ形成されるようになっているが、実際には印刷層3、着色アクリル樹脂フィルム2にも若干の凹部が形成される。このようにして、立体感がさらに向上したソフィスティケートな化粧金属板を得ることができる。
【0022】
図2に示す化粧金属板は以下のようにして作成される。図1に示す化粧金属板の作成方法と同様の作成方法を用いて、片面に印刷層3を形成させた透明アクリル樹脂フィルム1を作成する。また、図1に示す化粧金属板の作成方法と同様の作成方法を用いて着色アクリル樹脂フィルム2を作成し、その片面に図1に示す化粧金属板の金属板4に形成させた接着剤層5と同様の接着剤層5を形成させる。このようにして得られる透明アクリル樹脂フィルム1の印刷層3を形成させた面に、着色アクリル樹脂フィルム2の接着剤層5を形成させた面を当接し、ドライラミネート法を用いて積層し、複層フィルムを作成する。このようにして作成した複層フィルムにおいては透明アクリル樹脂フィルム1と着色アクリル樹脂フィルム2の良好な接着力が得られ、金属板に積層した後に強加工を施しても樹脂層同士が剥離することがない。次いで、図1に示す化粧金属板の接着方法と同様の接着方法を用いて複層フィルムを金属板4に熱接着する。なお、熱接着する際の後加熱工程において複層フィルムを軟化させ、エンボスロールを用いて透明樹脂アクリルフィルム1の表面に浅エンボス凹部8を設けてもよい。
【0023】
図3に示す化粧金属板は以下のようにして作成される。図1に示す化粧金属板の作成方法と同様の作成方法を用いて透明アクリル樹脂フィルム1を作成し、その片面に図1に示す化粧金属板の金属板4に形成させた接着剤層5と同様の接着剤層5を形成させる。また、図1に示す化粧金属板の作成方法と同様の作成方法を用いて着色アクリル樹脂フィルム2を作成し、その片面に図1に示す化粧金属板の印刷方法と同様の印刷方法を用いて印刷層3を形成させる。このようにして得られる透明アクリル樹脂フィルム1の接着剤層5を形成させた面に、着色アクリル樹脂フィルム2の印刷層3を形成させた面を当接し、ドライラミネート法を用いて積層し、複層フィルムを作成する。このようにして作成した複層フィルムにおいては透明アクリル樹脂フィルム1と着色アクリル樹脂フィルム2の良好な接着力が得られる。次いで、図1に示す化粧金属板の接着方法と同様の接着方法を用いて複層フィルムを金属板4に熱接着する。なお、熱接着する際の後加熱工程において複層フィルムを軟化させ、エンボスロールを用いて透明樹脂アクリルフィルム1の表面に深エンボス凹部7と浅エンボス凹部8を設けてもよい。
【0024】
上記の深エンボス凹部7は最大高さ(Ry)20〜120μmであることが好ましい。また上記の浅エンボス凹部8は算術平均粗さ(Ra)0.2〜5μm、または5μmを超え10μm以下であることが好ましい。深エンボス凹部7は、ロール表面の基部が鏡面であり、その鏡面基部に最大高さ(Ry)20〜120μmとなるような凸部を凸設したエンボスロールを用いて形成する。浅エンボス凹部8は、ロール表面が算術平均粗さ(Ra)0.2〜5μm、または5μmを超え10μm以下となるように、エッチング法、放電加工法、ブラスト処理法などの粗面加工を施したエンボスロールを用いて形成する。深エンボス凹部7と浅エンボス凹部8の両方を設ける場合は、ロール表面の基部が算術平均粗さ(Ra)0.2〜5μm、または5μmを超え10μm以下の粗面であり、その粗面基部に最大高さ(Ry)が20〜120μmとなるような凸部を凸設したエンボスロールを用いる。なお、これらのエンボスロールに替えて鏡面ロールを用いることにより、透明アクリル樹脂フィルムの表面を鏡面加工した化粧金属板を得ることもできる。また、透明アクリル樹脂フィルム1と着色アクリル樹脂フィルム2を積層して複層フィルムを作成する際に、積層用のロールとしてエンボスロールを用いて透明アクリル樹脂フィルム1の表面にエンボス凹部を設け、このようにして予めエンボス凹部を設けた複層フィルムを金属板に積層接着してもよい。
【0025】
【実施例】
以下、実施例にて本発明をさらに詳細に説明する。
(試料番号1〜5)
アクリル樹脂(三菱レーヨン(株)製:MF)とアクリルゴム(三菱レーヨン(株)製:IR−377)を表1に示すブレンド率(ブレンドした樹脂におけるアクリルゴムの重量%、以下同様)で混合し、220℃に加熱して溶融した後、カレンダー法を用いて表1に示す光透過率および厚さを有する透明アクリル樹脂フィルムを作成した。このようにして作成した透明アクリル樹脂フィルムの片面に、アクリル樹脂インキを用いて石目模様をグラビア輪転機により印刷した。また透明アクリル樹脂フィルムに用いたものと同様のアクリル樹脂とアクリルゴムを表1に示すブレンド率で混合し、220℃に加熱して溶融し、これに表1に示す白色顔料(二酸化チタン)と黒色顔料(カーボンブラック)を表1に示す含有量で含有させて混練した後、カレンダー法を用いて表1に示す厚さの着色アクリル樹脂フィルムを作成した。次いで、透明アクリル樹脂フィルムの印刷層を形成させた面と着色アクリル樹脂フィルムの片面を当接して重ね合わせ、1対の積層ロールを用い、積層ロールの加熱温度:130℃、積層ロールのニップ圧:2.45MPaの条件で両フィルムを積層して、複層フィルムを作成した。一方、厚さ:0.5mmの溶融亜鉛めっき鋼板(表1中でZn(m)で示す)の片面にアクリル樹脂系接着剤を乾燥後の厚さが4μmとなるように塗布し乾燥し、他の片面に裏面塗料としてエポキシメラミン塗料(下層)/ポリエステル塗料(上層)の2層を乾燥後の厚さが20μmとなるように塗布し乾燥した。この両面塗布溶融亜鉛めっき鋼板を220℃に加熱し、接着剤塗布面に上記の複層フィルムの着色アクリル樹脂フィルム面を当接し、1対の積層ロールを用い、積層ロールの加熱温度:110℃、積層ロールのニップ圧:2.65MPaの条件で挟み付けて熱圧着した。次いで積層体を210℃に後加熱し、ロール表面の基部が鏡面であり、その鏡面基部に種々の表面粗さの凸部を凸設したエンボスロールを用いて、透明アクリル樹脂面に表1に示す最大高さ(Ry)の深エンボス凹部(表1中でDで表示、以下同様)を形成させた。このようにして化粧金属板を得た。一部の試料に付いてはエンボス加工を施さず、複層フィルムを金属板に熱圧着したままとした。
【0026】
(試料番号6〜10)
試料番号1〜5と同様のアクリル樹脂とアクリルゴムを表1に示すブレンド率で混合し、220℃に加熱して溶融した後、カレンダー法を用いて表1に示す全光線透過率および厚さを有する透明アクリル樹脂フィルムを作成した。このようにして作成した透明アクリル樹脂フィルムの片面に、アクリル樹脂インキを用いて幾何学模様をグラビア輪転機により印刷した。また、試料番号1〜5と同様にして、表1に示す含有量で白色顔料(二酸化チタン)と緑色顔料(酸化クロム)を含有させた表1に示す厚さの着色アクリル樹脂フィルムを作成した。この着色アクリル樹脂フィルムの片面にアクリル樹脂系接着剤を乾燥後の厚さが4μmとなるように塗布し乾燥した。次いで、透明アクリル樹脂フィルムの印刷層を形成させた面と着色アクリル樹脂フィルムの接着剤層を形成させた面を当接して重ね合わせ、1対の積層ロールを用い、積層ロールの加熱温度:130℃、積層ロールのニップ圧:2.45MPaの条件で両フィルムを積層して、複層フィルムを作成した。一方、厚さ:0.5mmの電気亜鉛めっき鋼板(表1中でZn(e)で示す)の片面に実施例と同様にしてアクリル樹脂系接着剤を塗布し乾燥し、他の片面に試料番号1〜5と同様にして裏面塗料を塗布し乾燥した。この両面塗布電気亜鉛めっき鋼板を220℃に加熱し、接着剤塗布面に上記の複層フィルムの着色アクリル樹脂フィルム面を当接し、1対の積層ロールを用い、試料番号1〜5と同様にして熱圧着した。次いで積層体を220℃に後加熱し、ロール表面を種々の表面粗さに粗面加工したエンボスロールを用いて、透明アクリル樹脂面に表1に示す、算術平均粗さ(Ra)の浅エンボス凹部(表1中でSで表示、以下同様)を形成させ、次いで常温まで急冷した。このようにして化粧金属板を得た。一部の試料に付いてはエンボス加工を施さず、複層フィルムを金属板に熱圧着したままとした。
【0027】
(試料番号11〜15)
試料番号1〜5と同様のアクリル樹脂とアクリルゴムを表1に示すブレンド率で混合し、220℃に加熱して溶融した後、カレンダー法を用いて表1に示す全光線透過率および厚さを有する透明アクリル樹脂フィルムを作成した。この透明アクリル樹脂フィルムの片面にアクリル樹脂系接着剤を乾燥後の厚さが4μmとなるように塗布し乾燥した。また、試料番号1〜5と同様にして、表1に示す含有量で白色顔料(二酸化チタン)と茶色顔料(ベンガラ)を含有させた表1に示す厚さの着色アクリル樹脂フィルムを作成した。この着色アクリル樹脂フィルムの片面に、ニトロセルロース−アルキドインキを用いて木目模様をグラビア輪転機により印刷した。次いで、透明アクリル樹脂フィルムの接着層を形成させた面と着色アクリル樹脂フィルムの印刷層を形成させた面を当接して重ね合わせ、1対の積層ロールを用い、試料番号6〜10と同様にして両フィルムを積層して、複層フィルムを作成した。一方、厚さ:0.5mmの亜鉛(95%)−アルミニウム(5%)合金の溶融めっき鋼板(表1中でZn−Alで示す)の片面に試料番号1〜5と同様にしてアクリル樹脂系接着剤を塗布し乾燥し、他の片面に試料番号1〜5と同様にして裏面塗料を塗布し乾燥した。この両面塗布亜鉛−アルミニウム合金溶融めっき鋼板を220℃に加熱し、接着剤塗布面に上記の複層フィルムの着色アクリル樹脂フィルム面を当接し、1対の積層ロールを用い、試料番号1〜5と同様にして熱圧着した。次いで積層体を210℃に後加熱し、ロール表面の基部が算術平均粗さ(Ra)の粗面であり、その粗面基部に最大高さ(Ry)である凸部を凸設したエンボスロールを用いて、透明アクリル樹脂面に表1に示す最大高さ(Ry)の深エンボス凹部(D)と算術平均粗さ(Ra)の浅エンボス凹部(S)の両方を形成させ、次いで、常温まで急冷した。このようにして化粧金属板を得た。一部の試料に付いてはエンボス加工を施さず、複層フィルムを金属板に熱圧着したままとした。
【0028】
【表1】

Figure 2004142164
【0029】
(特性評価)
上記のようにして得られた試料番号1〜15の各試料について、下記の特性を評価した。
[表面粗さ]
試料の透明アクリル樹脂フィルム面の表面粗さを、触針式表面粗さ計(東京精密(株)製、サーフコム1500A)を用い、JIS B 0601に準拠して最大高さ(Ry)および算術平均粗さ(Ra)を測定した。
[全光線透過率]
試料の透明アクリル樹脂フィルムの光透過率を、グロスメーター(日本電色工業(株)製、グロスメーターVG2000)を用い、JIS K 7105に準拠して測定した。
【0030】
[加工性]
試料を0T折り曲げ加工し、曲げ加工部の樹脂層のクラックの発生程度を肉眼観察し、下記の基準で評価した。
◎:クラック裂の発生は認められない。
○:樹脂層の加工部の一部に実用上問題とならない程度の僅かなクラックの発生が認められる。
△:樹脂層の加工部の一部に実用上問題となる程度のクラックの発生が認められる。
×:樹脂層の加工部の全体にクラックの発生が認められる。
【0031】
[耐候性]
試料の樹脂フィルムにカッター刃を用いて基板の鋼板面に達するクロスカットを施し、サンシャインウェザオメータ試験(JIS A 1415)を試験時間8000時間にわたって実施した後、クロスット部の周辺部を肉眼観察し、下記の基準で評価した。
◎:変色、クラック、ブリスターの発生は認められない。
○:クロスカット部に実用上問題とならない程度の極く僅かなブリスターの発生が認められる。
△:クロスカット部に実用上問題となる程度の変色、クラック、ブリスターの発生が認められる。
×:試料全面にかなりの程度に変色、クラック、ブリスターの発生が認められる。
評価結果を表2に示す。
【0032】
【表2】
Figure 2004142164
【0033】
表2に示すように、本発明の化粧金属板は折り曲げ加工性および耐候性に優れており、厳しい曲げ加工を施しても樹脂層にクラックが生じることがなく、長時間屋外に暴露しても樹脂フィルムにブリスター、クラック、変色などの発生は認められず、優れた意匠性を保持することができる。
【0034】
【発明の効果】
本発明の化粧金属板は上記のように構成されており、アクリル樹脂とアクリルゴムをブレンドしてなる透明アクリル樹脂層と、同一のブレンド樹脂に着色顔料を含有させた着色アクリル樹脂層の間に印刷層を形成させてなる複層樹脂を亜鉛鋼板などの金属板に積層し、選択的に透明アクリル樹脂層の表面にエンボス凹部を形成させた化粧金属板であり、折り曲げ加工性および耐候性に優れているため、建物外部の屋根材、壁材、ドアなどの屋外建材や、建物内部の壁材、仕切材、ドアなどの屋外建材などに好適に適用できる。また、透明樹脂層と着色樹脂層に同一のブレンド樹脂を用いているため、複層フィルムを製造する際に他の樹脂層と使い分ける必要が無く、製造上コスト的に有利である。
さらに本発明の化粧金属板は、従来のポリ塩化ビニル樹脂フィルム被覆鋼板と同様の製造設備を用いて製造することが可能であり、新規設備の増設や改造などの設備投資が不要である。またポリ塩化ビニル樹脂フィルム被覆鋼板と同様のエンボス加工が可能であり、意匠性に優れた表面形状を実現できる。またさらに、透明アクリル樹脂や着色アクリル樹脂にはポリ塩化ビニル樹脂のように可塑剤を含有していないので、可塑剤のブリ−ドによる表面汚染の問題を生じることがない。またさらに、焼却廃棄する際に有毒物を発生がないので、環境保全性においても優れている。さらにまた、透明アクリル樹脂は比較的硬い樹脂であるので耐磨耗性にも優れており、そのため下層の印刷層を保護する、意匠耐久性にも優れている。
【図面の簡単な説明】
【図1】本発明の化粧金属板の実施態様の一例を示す模式断面図。
【図2】本発明の化粧金属板の実施態様の他の一例を示す模式断面図。
【図3】本発明の化粧金属板の実施態様の他の一例を示す模式断面図。
【符号の説明】
1 : 透明アクリル樹脂フィルム
2 : 着色アクリル樹脂フィルム
3 : 印刷層
4 : 金属板
5 : 接着剤層
7 : 深エンボス凹部
8 : 浅エンボス凹部
10 : 化粧金属板[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a decorative metal plate obtained by coating a metal plate with an acrylic resin and having particularly excellent weather resistance and design.
[0002]
[Prior art]
Conventionally, as a building material outside the building, such as roof materials, wall materials, and doors, and as a building material inside the building, such as wall materials, partition materials, and doors, a coated metal plate made of a metal plate coated with polyvinyl chloride resin Was used. However, when these polyvinyl chloride resin-coated metal plates that are no longer needed are incinerated and disposed of, toxic substances such as dioxin and contaminants such as hydrogen chloride are generated and adversely affect the environment. For building materials, a resin-coated metal sheet is required instead of a polyvinyl chloride resin-coated metal sheet as shown below.
[0003]
In addition, for these applications, for example, when subjected to a bending process on a resin-coated metal plate for forming into a door or the like, excellent workability without cracking in the resin layer is required. In addition to design features such as patterns and surface gloss, embossability is also required, in which various minute recesses such as recesses imitating stones and wood grain and recesses of geometric patterns are formed by embossing. It is required that the coating resin layer is made of a resin that can obtain their bending workability, designability, embossability, and excellent weather resistance when used outdoors.
[0004]
To meet these various requirements, various resin-coated metal plates have been proposed. As a conventional technique, a print layer is formed on a transparent second thermoplastic resin layer (biaxially stretched polyethylene terephthalate film) having a haze of 1 to 8% and a light transmittance of 70% or more in a wavelength range of 400 to 700 nm. Then, the decorative sheet in which the transparent first thermoplastic resin layer (PVC film) is laminated via the second adhesive layer is attached to the metal plate on which the colored first adhesive layer is formed, and the laminated metal sheet is laminated. A plate is disclosed (for example, see Patent Document 1). In this resin-coated metal plate, a biaxially stretched polyethylene terephthalate film having excellent transparency was used as the resin for the outermost layer because no consideration was given to forming a concave portion on the resin surface that is the outermost surface of the laminated metal plate. However, it is extremely difficult to form a concave portion by embossing a biaxially stretched film, and it cannot be applied to the present invention in which a concave portion is formed in a resin layer which is the outermost surface of a decorative metal plate.
[0005]
Further, it discloses an acrylic decorative metal plate in which an acrylic resin composition in which rubber-containing polymer particles are dispersed in an acrylic resin in an amount of 5 to 25% by weight is laminated on a metal plate (for example, see Patent Document 2). In this acrylic decorative metal plate, since the amount of elastic rubber particles contained in the acrylic resin is small, the resin layer is likely to crack when subjected to bending, and cannot be applied to the present invention.
[0006]
Further, a resin film for decorative board lamination is obtained by embossing a film in which a polybutylene terephthalate film is used as a base resin layer and an acrylic resin in which an acrylic rubber component is blended in an amount of 60 to 100% is sequentially laminated from the bottom as a surface resin layer. On a metal plate is disclosed (for example, see Patent Document 3). In this decorative laminate resin film, it is suggested that a color pigment is kneaded into a base resin layer and / or a surface resin layer to form a colored resin layer, but a printed layer expressing a pattern or the like is provided. And lacks design. In addition, since different types of resin layers are selectively used as the resin layers of the surface resin layer and the base resin layer, the cost merit can be obtained by using the same acrylic resin for different resin layers as in the present invention. Absent.
[0007]
The following is prior art document information relating to the invention of this application.
[Patent Document 1]
JP-A-06-305075
[Patent Document 2]
JP 2000-255003 A
[Patent Document 3]
JP-A-2002-059512
[0008]
[Problems to be solved by the invention]
The present invention is applied to outdoor building materials such as roof materials, wall materials, and doors outside buildings, and outdoor building materials such as wall materials, partition materials, and doors inside buildings. An object of the present invention is to provide a decorative metal sheet having excellent bending workability, design properties, design durability, and weather resistance, which does not adversely affect the environment due to generation of contaminants such as hydrogen.
[0009]
[Means for Solving the Problems]
The decorative metal plate of the present invention that solves the above-mentioned problems, a decorative metal plate formed by forming a transparent acrylic resin layer, a printed layer, a colored acrylic resin layer, and an adhesive layer on at least one surface of the metal plate in order from the surface layer side, Or
On at least one side of the metal plate, in order from the surface side, a transparent acrylic resin layer, a printing layer, an adhesive layer, a colored acrylic resin layer, a decorative metal plate formed by forming an adhesive layer, or
On at least one side of the metal plate, in order from the surface layer side, a transparent acrylic resin layer, an adhesive layer, a printing layer, a colored acrylic resin layer, any of decorative metal plates formed by forming an adhesive layer,
The total light transmittance of the transparent acrylic resin layer according to JIS K 7105 (hereinafter, simply referred to as total light transmittance) is 60% or more;
The acrylic resin layer is formed by blending 0 to 40% by weight of acrylic resin and 60 to 100% by weight of acrylic rubber;
A concave portion formed by embossing on the surface of the transparent acrylic resin layer, and furthermore
The concave portion formed by embossing is formed of a deep embossed concave portion having a surface roughness of 20 to 120 μm of a maximum height (Ry) according to JIS B 0601 (hereinafter, simply referred to as a maximum height (Ry)), or
The concave portion formed by embossing is formed of a shallow embossed concave portion having a surface roughness of 0.2 to 5 μm in arithmetic average roughness (Ra) (hereinafter simply referred to as arithmetic average roughness (Ra)) according to JIS B0601.
The concave portion formed by embossing includes both a deep embossed concave portion having a maximum height (Ry) of 20 to 120 μm and a shallow embossed concave portion having an arithmetic average roughness (Ra) of 0.2 to 5 μm, or
The concave portion formed by embossing is one of a deep embossed concave portion having a maximum height (Ry) of 20 to 120 μm and a shallow embossed concave portion having an arithmetic average roughness (Ra) of more than 5 μm and 10 μm or less. And then
The metal plate is a galvanized steel plate.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The decorative metal plate of the present invention comprises, in order from the surface layer side, a transparent acrylic resin layer made of an acrylic resin obtained by blending 0 to 40% by weight of an acrylic resin and 60 to 100% by weight of an acrylic rubber, a printed layer, and a transparent acrylic layer. It is formed by laminating a multilayer resin film composed of a colored acrylic resin layer containing a resin containing a colored pigment on at least one surface of a metal plate via an adhesive layer. The printing layer of stone, grain, and geometric pattern is formed on either the transparent acrylic resin layer or the colored acrylic resin layer, and these resin layers are provided via a printing layer or further provided with an adhesive layer. And the adhesive layer. In addition, embossing may be performed on the surface of the transparent acrylic resin layer to provide minute concave portions, and a three-dimensional stone grain, wood grain, or a geometric pattern may be formed to improve the design.
Hereinafter, the present invention will be described in detail.
[0011]
The resin applied to the outermost surface of a decorative metal plate used for an outdoor building material such as a roof material outside the building, a wall material, and a door of the present invention and a wall material inside the building, a partition material, and a door, etc. As described above, it is required that the resin does not generate a toxic gas that deteriorates the environment when incinerated and discarded, has a hardness that does not easily cause scratches, and has excellent transparency. From such a viewpoint, in the present invention, a transparent acrylic resin and a colored acrylic resin containing a colored pigment in the transparent acrylic resin are used.
[0012]
Examples of the acrylic resin include homopolymers such as methyl methacrylate, ethyl methacrylate, and butyl methacrylate, and copolymers thereof, and acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, and acrylic acid. 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, lauryl acrylate, lauryl methacrylate, stearyl acrylate, stearyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, benzyl acrylate, benzyl methacrylate, glycidyl acrylate, glycidyl methacrylate Copolymers such as 2-hydroxydiethyl acrylate, 2-hydroxydiethyl methacrylate, 2-hydroxypropyl acrylate and 2-hydroxypropyl methacrylate Rukoto can.
[0013]
However, acrylic resin is hard and has poor processability because it is hard.When resin-coated metal plates coated with these acrylic resins are bent to be processed into doors, etc., if the radius of curvature of the bent portion is small, Cracks occur. Therefore, in the present invention, the workability is improved by blending an acrylic rubber with these acrylic resins. Examples of the acrylic rubber include alkyl acrylates such as ethyl acrylate, propyl acrylate, and butyl acrylate; alkoxyalkyl acrylates such as methoxyethyl acrylate and ethoxyethyl acrylate; alkoxyl alkyl acrylates such as methylthioethyl acrylate; and cyanoalkyl acrylates such as cyanoethyl acrylate. One or two or more of these are the main components, butadiene, methylbutadiene, isoprene, piperylene, 1,4-pentadiene, methylpentadiene, cyclopentadiene, dicyclopentadiene, vinylcyclopentadiene, acetoxybutadiene, methoxybutadiene, cyanobutadiene , Ethylidene norbornene, vinylidene norbornene, propenyl norbornene One or more diene monomers such as dicyclopentadienyl acrylate or one or more aromatic vinyl monomers such as styrene, α-methylstyrene and paramethylstyrene as a crosslinking group component A copolymer obtained by copolymerization can be used.
[0014]
These acrylic rubbers are preferably blended in an amount of 60 to 100% by weight based on the acrylic resin. If the blending ratio is less than 60% by weight, sufficient processability cannot be obtained. On the other hand, even if a resin consisting of only acrylic rubber is used without containing any acrylic resin, bending processing with a small radius of curvature aimed at by the present invention, a resin film having the required light transmittance and weather resistance are obtained. be able to. The acrylic resin is preferably 40% by weight or less based on the above acrylic resin. If the blending ratio of the acrylic resin is low, the hardness is reduced and scratches are likely to occur. Therefore, in applications requiring scratch resistance, it is more preferable to blend 3 to 40% by weight of an acrylic resin to increase the hardness of the resin.
[0015]
The thus obtained transparent acrylic resin layer applied to the present invention preferably has a total light transmittance of 60% or more. When the total light transmittance is less than 60%, the pattern of the printing layer formed below the transparent acrylic resin layer and the sharpness of the color tone of the colored acrylic resin layer become poor. The thickness of the transparent acrylic resin layer is preferably from 10 to 100 μm. When the thickness is less than 10 μm, the design becomes poor in three-dimensional appearance, and depending on the use conditions and use environment, the transparent acrylic resin layer may be lost due to abrasion and the underlying print layer may be exposed, resulting in poor design durability. On the other hand, even if it exceeds 100 μm, the effect of improving the design properties and the design durability is saturated, and the cost is not advantageous.
[0016]
As the colored acrylic resin applied to the present invention, a resin obtained by blending an acrylic resin with an acrylic rubber and containing a coloring pigment in an amount of 3 to 30% by weight in the above transparent acrylic resin is used. The content depends on the color, but if it is less than 3% by weight, it is difficult to obtain a beautiful color, and if it exceeds 30% by weight, the resin film is liable to crack when subjected to bending. One or more kinds of organic or inorganic colored pigments such as white, black, red, blue, yellow, green, and tea are kneaded with the above transparent acrylic resin as a coloring pigment, and a desired color acrylic is obtained. It can be a resin. The thickness of the colored acrylic resin layer is preferably 30 to 200 μm. If it is less than 30 μm, the corrosion resistance may be insufficient, and if it is more than 200 μm, the effect of improving the corrosion resistance is saturated and the cost is not advantageous.
[0017]
In the present invention, between the transparent acrylic resin layer and the colored acrylic resin layer, a printed layer such as a stone pattern, a grain pattern, a surface pattern of natural leather, a grain pattern, an abstract pattern, and a geometric pattern is provided. By providing this printing layer, excellent design properties are obtained, in which the pattern of the printing layer, the color of the colored acrylic resin layer, and the three-dimensional effect of the thickness of the transparent resin layer are combined. The printing layer is formed on one side of either the transparent acrylic resin layer or the colored acrylic resin layer. As the vehicle of the ink for forming the print layer, for example, known cellulose derivatives such as nitrocellulose and cellulose acetate, urethane resins, and acrylic resins can be used. Resin-based inks are preferred.
[0018]
In the decorative metal plate of the present invention, the metal plate serving as a substrate to be laminated and coated with the above resin layer is a steel plate, various types of plated steel plates, aluminum alloy plates, and those subjected to a chemical conversion treatment, stainless steel plates. Etc. can be used. Examples of the galvanized steel sheet include a galvanized steel sheet, a tin-coated steel sheet, and an aluminum-coated steel sheet. From the viewpoint of corrosion resistance, an electro-galvanized steel sheet, a hot-dip galvanized steel sheet, a zinc (95%)-aluminum (5%) alloy It is preferable to use any one of the hot-dip coated steel sheets. As the chemical conversion treatment, various non-chromium treatments such as a coating type chromate treatment, a phosphate chromate treatment, an electrolytic chromate treatment containing no hexavalent chromium, and a zinc phosphate treatment can be applied.
[0019]
Next, a method for forming a decorative metal plate of the present invention will be described. FIGS. 1, 2 and 3 each show an embodiment of the decorative metal plate of the present invention.
The decorative metal plate shown in FIG. 1 is prepared as follows. An acrylic resin and an acrylic rubber are blended and melted by heating, and a transparent acrylic resin film 1 is formed by using a calendar method or an extrusion method. Next, a printing layer 3 is formed on one surface of the transparent acrylic resin film 1 by using a known printing method. Further, a colored pigment is kneaded with a blended resin composed of an acrylic resin and an acrylic rubber similar to the transparent acrylic resin film 1 and melted by heating, and a colored acrylic resin film 2 is formed by a calendering method or an extrusion method. When kneading the color pigment with the blended resin, an ultraviolet absorber for preventing a change in color tone when exposed to direct sunlight for a long time may be kneaded. A colored acrylic resin film 2 is laminated on the surface of the transparent acrylic resin film 1 thus obtained on which the printed layer 3 is formed by using a heat laminating method to form a multilayer film.
[0020]
On the other hand, an adhesive is applied to one side of the metal plate 4 and dried to form an adhesive layer 5. Examples of the adhesive include emulsion-type adhesives such as vinyl acetate resin, ethylene-vinyl acetate resin, urea resin, urethane resin, acrylic resin, polyester resin, polyester urethane resin, and epoxy-phenol resin. Such a thermosetting adhesive can be used. Although not shown, a back paint coating layer made of polyester, epoxy, alkyd, melamine, urea resin, vinyl, polyamide, polyurethane, or the like is formed on the surface of the metal plate 4 where the adhesive layer 5 is not formed. May be formed in one layer or two or more layers.
[0021]
Next, the metal plate 4 on which the adhesive layer 5 is formed is heated to 200 to 240 ° C., and the surface of the multi-layer film of the colored acrylic resin film 2 is brought into contact with the surface on which the adhesive layer 5 is formed. It is sandwiched between laminated rolls and thermally bonded. Next, after post-heating to 180 to 230 ° C., it is immersed in water and rapidly cooled. When the post-heating is performed, a deep embossed concave portion 7 may be provided on the surface of the transparent resin acrylic film 1 using an emboss roll. Although the deep embossed recess 7 is formed only on the surface of the transparent acrylic resin in the figure, a slight recess is actually formed on the printing layer 3 and the colored acrylic resin film 2. In this way, it is possible to obtain a sofitic decorative metal plate with a further improved three-dimensional effect.
[0022]
The decorative metal plate shown in FIG. 2 is prepared as follows. A transparent acrylic resin film 1 having a printed layer 3 formed on one surface is prepared by using a method similar to the method for preparing a decorative metal plate shown in FIG. Further, a colored acrylic resin film 2 is prepared by using the same method as that of forming the decorative metal plate shown in FIG. 1, and an adhesive layer formed on one surface of the metal plate 4 of the decorative metal plate shown in FIG. An adhesive layer 5 similar to 5 is formed. The surface of the transparent acrylic resin film 1 thus obtained, on which the printing layer 3 is formed, is brought into contact with the surface of the colored acrylic resin film 2, on which the adhesive layer 5 is formed, and is laminated using a dry lamination method. Create a multilayer film. In the multilayer film formed in this way, a good adhesive strength between the transparent acrylic resin film 1 and the colored acrylic resin film 2 is obtained, and the resin layers are separated from each other even after being subjected to strong processing after being laminated on a metal plate. There is no. Next, the multilayer film is thermally bonded to the metal plate 4 using the same bonding method as the bonding method of the decorative metal plate shown in FIG. In addition, the multilayer film may be softened in a post-heating step at the time of heat bonding, and a shallow embossed concave portion 8 may be provided on the surface of the transparent resin acrylic film 1 using an embossing roll.
[0023]
The decorative metal plate shown in FIG. 3 is created as follows. A transparent acrylic resin film 1 is prepared by using the same method as that for forming the decorative metal plate shown in FIG. 1, and an adhesive layer 5 formed on the metal plate 4 of the decorative metal plate shown in FIG. A similar adhesive layer 5 is formed. Further, a colored acrylic resin film 2 is prepared by using the same manufacturing method as that of the decorative metal plate shown in FIG. 1, and one side thereof is formed by using the same printing method as that of the decorative metal plate shown in FIG. The printing layer 3 is formed. The surface of the transparent acrylic resin film 1 thus obtained on which the adhesive layer 5 is formed is brought into contact with the surface of the colored acrylic resin film 2 on which the printed layer 3 is formed, and is laminated using a dry lamination method. Create a multilayer film. In the multilayer film formed in this manner, a good adhesive strength between the transparent acrylic resin film 1 and the colored acrylic resin film 2 can be obtained. Next, the multilayer film is thermally bonded to the metal plate 4 using the same bonding method as the bonding method of the decorative metal plate shown in FIG. In addition, the multilayer film may be softened in a post-heating step at the time of heat bonding, and the deep embossed concave portion 7 and the shallow embossed concave portion 8 may be provided on the surface of the transparent resin acrylic film 1 using an embossing roll.
[0024]
It is preferable that the deep embossed recess 7 has a maximum height (Ry) of 20 to 120 μm. The above-mentioned shallow embossed concave portion 8 preferably has an arithmetic average roughness (Ra) of 0.2 to 5 μm, or more than 5 μm and 10 μm or less. The deep embossed concave portion 7 is formed by using an emboss roll in which the base of the roll surface is a mirror surface and a convex portion having a maximum height (Ry) of 20 to 120 μm is protruded from the mirror base. The shallow embossed concave portion 8 is roughened by an etching method, an electric discharge machining method, a blasting method, or the like so that the roll surface has an arithmetic average roughness (Ra) of 0.2 to 5 μm or more than 5 μm and 10 μm or less. It is formed by using the embossed roll. When both the deep embossed recess 7 and the shallow embossed recess 8 are provided, the base of the roll surface is an arithmetic average roughness (Ra) of 0.2 to 5 μm, or a rough surface exceeding 5 μm and 10 μm or less, and the rough surface base is used. An embossing roll having a convex portion having a maximum height (Ry) of 20 to 120 μm is used. By using a mirror roll instead of these embossing rolls, it is possible to obtain a decorative metal plate in which the surface of the transparent acrylic resin film is mirror-finished. Further, when a transparent acrylic resin film 1 and a colored acrylic resin film 2 are laminated to form a multilayer film, an embossed recess is provided on the surface of the transparent acrylic resin film 1 using an embossing roll as a laminating roll. The multilayer film provided with the embossed concave portions in advance may be laminated and bonded to a metal plate.
[0025]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples.
(Sample Nos. 1 to 5)
Acrylic resin (Mitsubishi Rayon Co., Ltd .: MF) and acrylic rubber (Mitsubishi Rayon Co., Ltd .: IR-377) are mixed at a blending ratio shown in Table 1 (weight of acrylic rubber in the blended resin, hereinafter the same). Then, after heating and melting at 220 ° C., a transparent acrylic resin film having a light transmittance and a thickness shown in Table 1 was prepared using a calender method. A stone pattern was printed on one surface of the transparent acrylic resin film thus prepared using an acrylic resin ink by a gravure rotary press. Further, the same acrylic resin and acrylic rubber as those used for the transparent acrylic resin film were mixed at the blending ratio shown in Table 1, heated to 220 ° C. and melted, and mixed with a white pigment (titanium dioxide) shown in Table 1. After the black pigment (carbon black) was contained at the content shown in Table 1 and kneaded, a colored acrylic resin film having the thickness shown in Table 1 was prepared using a calendar method. Then, the surface of the transparent acrylic resin film on which the printed layer is formed and the one surface of the colored acrylic resin film are brought into contact with each other and overlapped, and using a pair of laminated rolls, the heating temperature of the laminated roll: 130 ° C. : Both films were laminated under the condition of 2.45 MPa to prepare a multilayer film. On the other hand, one side of a hot-dip galvanized steel sheet (shown as Zn (m) in Table 1) having a thickness of 0.5 mm is coated with an acrylic resin-based adhesive so that the thickness after drying becomes 4 μm, and dried. Two layers of epoxy melamine paint (lower layer) / polyester paint (upper layer) were applied on the other side as a backside paint so that the thickness after drying was 20 μm, and dried. This double-sided hot-dip galvanized steel sheet is heated to 220 ° C., the colored acrylic resin film surface of the multilayer film is brought into contact with the adhesive-coated surface, and a pair of laminating rolls is used. Then, the nip pressure of the lamination rolls was 2.65 MPa, and sandwiched and thermocompression bonded. Next, the laminate was post-heated to 210 ° C., and the base of the roll surface was a mirror surface, and using an embossing roll having projections of various surface roughness projecting from the mirror surface base, a transparent acrylic resin surface was formed as shown in Table 1. Deep embossed concave portions having the maximum height (Ry) shown (indicated by D in Table 1, the same applies hereinafter) were formed. Thus, a decorative metal plate was obtained. Some of the samples were not embossed, and the multilayer film was kept thermocompressed to the metal plate.
[0026]
(Sample Nos. 6 to 10)
The same acrylic resin and acrylic rubber as those in Sample Nos. 1 to 5 were mixed at the blending ratio shown in Table 1, heated to 220 ° C. and melted, and then the total light transmittance and thickness shown in Table 1 using a calendar method. The transparent acrylic resin film which has this was produced. A geometric pattern was printed on one surface of the transparent acrylic resin film thus prepared by using a gravure rotary press using an acrylic resin ink. Further, in the same manner as in Sample Nos. 1 to 5, colored acrylic resin films having the thickness shown in Table 1 containing the white pigment (titanium dioxide) and the green pigment (chromium oxide) at the contents shown in Table 1 were prepared. . An acrylic resin-based adhesive was applied to one side of the colored acrylic resin film so that the thickness after drying was 4 μm, and dried. Next, the surface of the transparent acrylic resin film on which the printed layer is formed and the surface of the colored acrylic resin film on which the adhesive layer is formed are brought into contact with each other and overlapped with each other. C. and a nip pressure of a laminating roll: 2.45 MPa, the two films were laminated to form a multilayer film. On the other hand, an acrylic resin-based adhesive was applied to one side of an electrogalvanized steel sheet (indicated by Zn (e) in Table 1) having a thickness of 0.5 mm and dried in the same manner as in Example, and the sample was applied to the other side. The back paint was applied and dried in the same manner as in Nos. 1 to 5. This double-coated electrogalvanized steel sheet is heated to 220 ° C., and the colored acrylic resin film surface of the multilayer film is brought into contact with the adhesive-coated surface, and a pair of laminated rolls is used. Thermocompression bonding. Next, the laminated body was post-heated to 220 ° C., and the embossed roll having the roll surface roughened to various surface roughnesses was used. The transparent acrylic resin surface was subjected to shallow embossing with an arithmetic average roughness (Ra) shown in Table 1 shown in Table 1. Depressions (indicated by S in Table 1, hereinafter the same) were formed and then rapidly cooled to room temperature. Thus, a decorative metal plate was obtained. Some of the samples were not embossed, and the multilayer film was kept thermocompressed to the metal plate.
[0027]
(Sample Nos. 11 to 15)
The same acrylic resin and acrylic rubber as those in Sample Nos. 1 to 5 were mixed at the blending ratio shown in Table 1, heated to 220 ° C. and melted, and then the total light transmittance and thickness shown in Table 1 using a calendar method. The transparent acrylic resin film which has this was produced. An acrylic resin-based adhesive was applied to one side of this transparent acrylic resin film so that the thickness after drying was 4 μm, and dried. Further, in the same manner as in Sample Nos. 1 to 5, colored acrylic resin films having the thickness shown in Table 1 and containing the white pigment (titanium dioxide) and the brown pigment (Bengara) at the contents shown in Table 1 were prepared. A grain pattern was printed on one surface of the colored acrylic resin film using a gravure rotary press using nitrocellulose-alkyd ink. Then, the surface of the transparent acrylic resin film on which the adhesive layer is formed and the surface of the colored acrylic resin film on which the printed layer is formed are brought into contact with each other and overlapped, using a pair of laminated rolls, in the same manner as in Sample Nos. 6 to 10. To form a multilayer film. On the other hand, an acrylic resin was applied to one surface of a hot-dip coated steel sheet (shown as Zn-Al in Table 1) of a zinc (95%)-aluminum (5%) alloy having a thickness of 0.5 mm in the same manner as in Sample Nos. 1 to 5. A system adhesive was applied and dried, and the other side was coated with a backside paint in the same manner as in Sample Nos. 1 to 5 and dried. The zinc-aluminum alloy hot-dip coated steel sheet coated on both sides is heated to 220 ° C., the colored acrylic resin film surface of the multilayer film is brought into contact with the adhesive applied surface, and a pair of laminated rolls is used. Thermocompression bonding was performed in the same manner as described above. Next, the laminate is post-heated to 210 ° C., and the base of the roll surface is a rough surface having an arithmetic average roughness (Ra), and the embossing roll having a convex portion having the maximum height (Ry) protruding from the rough surface base. Is used to form both the deep embossed concave portion (D) having the maximum height (Ry) shown in Table 1 and the shallow embossed concave portion (S) having the arithmetic average roughness (Ra) shown in Table 1 and then at room temperature. Rapidly cooled down. Thus, a decorative metal plate was obtained. Some of the samples were not embossed, and the multilayer film was kept thermocompressed to the metal plate.
[0028]
[Table 1]
Figure 2004142164
[0029]
(Characteristic evaluation)
The following characteristics were evaluated for each of the sample numbers 1 to 15 obtained as described above.
[Surface roughness]
The surface roughness of the transparent acrylic resin film surface of the sample was measured using a stylus type surface roughness meter (Surfcom 1500A, manufactured by Tokyo Seimitsu Co., Ltd.) in accordance with JIS B 0601 and the maximum height (Ry) and arithmetic mean. The roughness (Ra) was measured.
[Total light transmittance]
The light transmittance of the transparent acrylic resin film of the sample was measured using a gloss meter (Gloss Meter VG2000, manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K 7105.
[0030]
[Workability]
The sample was bent by 0T, and the degree of occurrence of cracks in the resin layer at the bent portion was visually observed and evaluated according to the following criteria.
A: No crack generation is observed.
:: Slight crack generation is observed in a part of the processed portion of the resin layer, which is not a problem in practical use.
Δ: Cracks were observed in a part of the processed part of the resin layer to such an extent that it became a practical problem.
×: Cracks are observed in the entire processed portion of the resin layer.
[0031]
[Weatherability]
The resin film of the sample was subjected to a cross cut reaching the steel plate surface of the substrate using a cutter blade, and a sunshine weatherometer test (JIS A 1415) was performed for 8000 hours. Was evaluated according to the following criteria.
A: No discoloration, cracks, or blisters are observed.
:: Extremely slight blister generation was observed in the cross cut portion to such an extent that no practical problem occurred.
Δ: Discoloration, cracks, and blisters at a level that poses a practical problem are observed in the cross cut portion.
×: Discoloration, cracks and blisters are observed to a considerable extent on the entire surface of the sample.
Table 2 shows the evaluation results.
[0032]
[Table 2]
Figure 2004142164
[0033]
As shown in Table 2, the decorative metal sheet of the present invention is excellent in bending workability and weather resistance, does not crack in the resin layer even when subjected to severe bending, and can be exposed outdoors for a long time. Generation of blisters, cracks, discoloration, and the like is not recognized in the resin film, and excellent design properties can be maintained.
[0034]
【The invention's effect】
The decorative metal plate of the present invention is configured as described above, and between a transparent acrylic resin layer obtained by blending an acrylic resin and an acrylic rubber, and a colored acrylic resin layer containing a colored pigment in the same blended resin. A decorative metal plate in which a multilayer resin formed with a printed layer is laminated on a metal plate such as a zinc steel plate, and embossed concave portions are selectively formed on the surface of a transparent acrylic resin layer. Because it is excellent, it can be suitably applied to outdoor building materials such as roof materials, wall materials, and doors outside buildings, and wall materials, partition materials, and doors inside buildings. Further, since the same blended resin is used for the transparent resin layer and the colored resin layer, it is not necessary to use different resin layers when manufacturing a multilayer film, which is advantageous in terms of manufacturing cost.
Further, the decorative metal sheet of the present invention can be manufactured using the same manufacturing equipment as the conventional steel sheet coated with a polyvinyl chloride resin film, and does not require capital investment such as addition or modification of new equipment. Further, embossing similar to that of a steel sheet coated with a polyvinyl chloride resin film is possible, and a surface shape excellent in design can be realized. Further, since the transparent acrylic resin and the colored acrylic resin do not contain a plasticizer unlike the polyvinyl chloride resin, there is no problem of surface contamination due to the plasticizer bleed. Furthermore, since no toxic substances are generated when incinerated and disposed of, it is excellent in environmental conservation. Further, since the transparent acrylic resin is a relatively hard resin, it is excellent in abrasion resistance, and therefore, it is excellent in design durability for protecting a lower printed layer.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing an example of an embodiment of a decorative metal plate of the present invention.
FIG. 2 is a schematic sectional view showing another example of the embodiment of the decorative metal plate of the present invention.
FIG. 3 is a schematic sectional view showing another example of the embodiment of the decorative metal plate of the present invention.
[Explanation of symbols]
1: transparent acrylic resin film
2: Colored acrylic resin film
3: Print layer
4: Metal plate
5: adhesive layer
7: Deep embossed recess
8: Shallow embossed recess
10: decorative metal plate

Claims (11)

金属板の少なくとも片面に、表層側から順に、透明アクリル樹脂層、印刷層、着色アクリル樹脂層、接着剤層を形成させてなる、化粧金属板。A decorative metal plate formed by forming a transparent acrylic resin layer, a printing layer, a colored acrylic resin layer, and an adhesive layer on at least one surface of a metal plate in order from the surface layer side. 金属板の少なくとも片面に、表層側から順に、透明アクリル樹脂層、印刷層、接着剤層、着色アクリル樹脂層、接着剤層を形成させてなる、化粧金属板。A decorative metal plate formed by forming a transparent acrylic resin layer, a printing layer, an adhesive layer, a colored acrylic resin layer, and an adhesive layer on at least one surface of a metal plate in order from the surface layer side. 金属板の少なくとも片面に、表層側から順に、透明アクリル樹脂層、接着剤層、印刷層、着色アクリル樹脂層、接着剤層を形成させてなる、化粧金属板。A decorative metal plate comprising a transparent acrylic resin layer, an adhesive layer, a printed layer, a colored acrylic resin layer, and an adhesive layer formed on at least one surface of a metal plate in order from the surface layer side. 前記透明アクリル樹脂層は、JIS K 7105による全光線透過率が60%以上であることを特徴とする、請求項1〜3のいずれかに記載の化粧金属板。The decorative metal plate according to any one of claims 1 to 3, wherein the transparent acrylic resin layer has a total light transmittance of 60% or more according to JIS K7105. 前記透明または着色アクリル樹脂層は、0〜40重量%のアクリル樹脂と60〜100重量%のアクリルゴムをブレンドしてなることを特徴とする、請求項1〜4のいずれかに記載の化粧金属板。The decorative metal according to any one of claims 1 to 4, wherein the transparent or colored acrylic resin layer is formed by blending 0 to 40% by weight of an acrylic resin and 60 to 100% by weight of an acrylic rubber. Board. 前記透明アクリル樹脂層は表面にエンボス加工による凹部が形成されてなることを特徴とする、請求項1〜5のいずれかに記載の化粧金属板。The decorative metal plate according to any one of claims 1 to 5, wherein the transparent acrylic resin layer has a concave portion formed by embossing on a surface thereof. 前記エンボス加工による凹部は、表面粗さがJIS B 0601による最大高さ(Ry)20〜120μmの深エンボス凹部からなる、請求項6に記載の化粧金属板。The decorative metal plate according to claim 6, wherein the concave portion formed by embossing is a deep embossed concave portion having a maximum surface roughness (Ry) of 20 to 120 m according to JIS B 0601. 前記エンボス加工による凹部は、JIS B 0601による表面粗さが算術平均粗さ(Ra)0.2〜5μmの浅エンボス凹部からなる、請求項6に記載の化粧金属板。The decorative metal sheet according to claim 6, wherein the concave portion formed by embossing is a shallow embossed concave portion having a surface roughness according to JIS {B} 0601 having an arithmetic average roughness (Ra) of 0.2 to 5 m. 前記エンボス加工による凹部は、表面粗さがJIS B 0601による最大高さ(Ry)20〜120μmの深エンボス凹部と、表面粗さがJIS B 0601による算術平均粗さ(Ra)0.2〜5μmの浅エンボス凹部の両方からなる、請求項6に記載の化粧金属板。The concave portion formed by the embossing has a deep embossed concave portion having a maximum surface roughness of 20 to 120 μm according to JIS B0601 and an arithmetic average roughness (Ra) 0.2 to 5 μm according to JIS B0601. The decorative metal sheet according to claim 6, comprising both shallow embossed concave portions. 前記エンボス加工による凹部は、表面粗さがJIS B 0601による最大高さ(Ry)20〜120μmの深エンボス凹部と、表面粗さがJIS B 0601による算術平均粗さ(Ra)5μmを超え10μm以下の浅エンボス凹部の両方からなる、請求項6に記載の化粧金属板。The concave portion formed by embossing has a deep embossed concave portion having a surface roughness of 20 to 120 μm in maximum height (Ry) according to JIS B0601, and an arithmetic average roughness (Ra) having a surface roughness of more than 5 μm and not more than 10 μm according to JIS B0601. The decorative metal sheet according to claim 6, comprising both shallow embossed concave portions. 金属板が亜鉛めっき鋼板であることを特徴とする、請求項1〜10のいずれかに記載の化粧金属板。The decorative metal plate according to any one of claims 1 to 10, wherein the metal plate is a galvanized steel plate.
JP2002307510A 2002-10-22 2002-10-22 Decorative metal plate Pending JP2004142164A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006159869A (en) * 2004-12-10 2006-06-22 Toyo Kohan Co Ltd Decorative metal plate
JP2012056146A (en) * 2010-09-07 2012-03-22 Dainippon Printing Co Ltd Non-combustibility decorative sheet, and non-combustibility decorative steel plate using the same
KR101213258B1 (en) * 2007-02-14 2012-12-17 (주)엘지하우시스 Plastic film for lamination having three-dimensional emboss effect and method for manufacturing the same
US8395530B2 (en) * 2010-03-11 2013-03-12 Khaled Jafar Al-Hasan Traffic control system
KR20130111704A (en) * 2012-04-02 2013-10-11 삼성전자주식회사 Finishing materials of appliance

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Publication number Priority date Publication date Assignee Title
JPS63280627A (en) * 1987-05-13 1988-11-17 Toyo Kohan Co Ltd Highly bright laminated metal plate and its manufacture
JPH04325249A (en) * 1991-04-25 1992-11-13 Dainippon Printing Co Ltd Manufacture of decorative material
JPH10166499A (en) * 1996-12-12 1998-06-23 Toppan Printing Co Ltd Decorative steel sheet
JP2002292789A (en) * 2001-03-30 2002-10-09 Toyo Kohan Co Ltd Resin coated metal panel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63280627A (en) * 1987-05-13 1988-11-17 Toyo Kohan Co Ltd Highly bright laminated metal plate and its manufacture
JPH04325249A (en) * 1991-04-25 1992-11-13 Dainippon Printing Co Ltd Manufacture of decorative material
JPH10166499A (en) * 1996-12-12 1998-06-23 Toppan Printing Co Ltd Decorative steel sheet
JP2002292789A (en) * 2001-03-30 2002-10-09 Toyo Kohan Co Ltd Resin coated metal panel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006159869A (en) * 2004-12-10 2006-06-22 Toyo Kohan Co Ltd Decorative metal plate
JP4686178B2 (en) * 2004-12-10 2011-05-18 東洋鋼鈑株式会社 Decorative metal plate
KR101213258B1 (en) * 2007-02-14 2012-12-17 (주)엘지하우시스 Plastic film for lamination having three-dimensional emboss effect and method for manufacturing the same
US8395530B2 (en) * 2010-03-11 2013-03-12 Khaled Jafar Al-Hasan Traffic control system
JP2012056146A (en) * 2010-09-07 2012-03-22 Dainippon Printing Co Ltd Non-combustibility decorative sheet, and non-combustibility decorative steel plate using the same
KR20130111704A (en) * 2012-04-02 2013-10-11 삼성전자주식회사 Finishing materials of appliance

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