JP5714756B1 - 塗装金属板の製造方法および外装建材 - Google Patents
塗装金属板の製造方法および外装建材 Download PDFInfo
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- JP5714756B1 JP5714756B1 JP2014164265A JP2014164265A JP5714756B1 JP 5714756 B1 JP5714756 B1 JP 5714756B1 JP 2014164265 A JP2014164265 A JP 2014164265A JP 2014164265 A JP2014164265 A JP 2014164265A JP 5714756 B1 JP5714756 B1 JP 5714756B1
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- metal plate
- coated metal
- top coat
- film
- coating
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Classifications
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2425/00—Indexing scheme corresponding to the position of each layer within a multilayer coating relative to the surface
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- B05D2425/00—Indexing scheme corresponding to the position of each layer within a multilayer coating relative to the surface
- B05D2425/02—Indexing scheme corresponding to the position of each layer within a multilayer coating relative to the surface second layer from the top surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2425/00—Indexing scheme corresponding to the position of each layer within a multilayer coating relative to the surface
- B05D2425/03—Indexing scheme corresponding to the position of each layer within a multilayer coating relative to the surface third layer from the top surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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Abstract
Description
[1]金属板と、前記金属板上に配置される上塗り塗膜とを有する塗装金属板であって、前記上塗り塗膜は、フッ素樹脂で構成され、前記上塗り塗膜は、細孔を有する粒子である光沢調整剤および一次粒子である艶消し剤を含有し、前記上塗り塗膜における前記光沢調整剤の含有量は、0.01〜15体積%であり、前記上塗り塗膜における前記艶消し剤の含有量は、0.01〜15体積%であり、前記光沢調整剤の個数平均粒径をR(μm)、前記上塗り塗膜の膜厚をT(μm)、前記光沢調整剤の個数基準の累積粒度分布における97.5%粒子径をD197.5(μm)、前記艶消し剤の個数基準の累積粒度分布における97.5%粒子径をD297.5(μm)、前記光沢調整剤の個数粒度分布における上限粒径をRu(μm)、としたときに、下記式を満足する、塗装金属板。
D197.5/T≦0.9
Ru≦1.2T
R≧1.0
0.5≦D297.5/T≦7.0
3≦T≦40
[2]前記Ruは、前記T未満である、[1]に記載の塗装金属板。
[3]前記金属板は、非クロメート防錆処理が施されており、前記塗装金属板は、クロメートフリーである、[1]または[2]に記載の塗装金属板。
[4]前記金属板は、クロメート防錆処理が施されている、[1]または[2]に記載の塗装金属板。
[5]前記光沢調整剤は、シリカ粒子である、[1]〜[4]のいずれか一項に記載の塗装金属板。
[6]前記金属板および前記上塗り塗膜の間に下塗り塗膜をさらに有する、[1]〜[5]のいずれか一項に記載の塗装金属板。
[7]前記下塗り塗膜および前記上塗り塗膜の間に中塗り塗膜をさらに有する、[6]に記載の塗装金属板。
[8]前記上塗り塗膜は、ポリフッ化ビニリデンとアクリル樹脂とからなる主成分としての樹脂成分によって構成されている、[1]〜[7]のいずれか一項に記載の塗装金属板。
[9]60°における光沢度が0.1〜15である、[1]〜[8]のいずれか一項に記載の塗装金属板。
[10]外装用塗装金属板である、[1]〜[9]のいずれか一項に記載の塗装金属板。
[11][1]〜[9]のいずれか一項に記載の塗装金属板で構成されている外装建材。
[12]金属板と、前記金属板上に配置される上塗り塗膜とを有する塗装金属板を製造する方法であって、フッ素樹脂、光沢調整剤および艶消し剤を含有する上塗り塗料を前記金属板上に塗布する工程と、前記上塗り塗料の塗膜を硬化して前記上塗り塗膜を形成する工程と、を含み、前記上塗り塗膜における前記光沢調整剤の含有量は、0.01〜15体積%であり、前記上塗り塗膜における前記艶消し剤の含有量は、0.01〜15体積%であり、前記光沢調整剤は、細孔を有する粒子であり、前記艶消し剤は、一次粒子であり、前記光沢調整剤の個数平均粒径をR(μm)、前記上塗り塗膜の膜厚をT(μm)、前記光沢調整剤の個数基準の累積粒度分布における97.5%粒子径をD197.5(μm)、前記艶消し剤の個数基準の累積粒度分布における97.5%粒子径をD297.5(μm)、前記光沢調整剤の個数粒度分布の上限粒径をRu(μm)、としたときに、下記式を満足する前記光沢調整剤および艶消し剤を用いる、塗装金属板の製造方法。
D197.5/T≦0.9
Ru≦1.2T
R≧1.0
0.5≦D297.5/T≦7.0
3≦T≦40
[13]前記上塗り塗料は、前記上塗り塗料中の粒子を粉砕する処理が施された、[12]に記載の塗装金属板の製造方法。
D197.5/T≦0.9
0.5≦D297.5/T≦7.0
D197.5/T≦0.9
Ru≦1.2T
R1≧1.0
0.5≦D297.5/T≦7.0
3≦T≦40
D197.5/T≦0.9
Ru≦1.2T
R1≧1.0
0.5≦D297.5/T≦7.0
3≦T≦40
両面付着量150g/m2の溶融55%Al―Zn合金めっき鋼板をアルカリ脱脂した(塗装原板1)。次いで、当該めっき鋼板のめっき層の表面に、塗装前処理として、20℃の、下記非クロメート防錆処理液を塗布し、当該めっき鋼板を水洗することなく100℃で乾燥し、Ti換算で10mg/m2の付着量の非クロメート防錆処理されためっき鋼板(塗装原板2)を得た。
(非クロメート防錆処理液)
ヘキサフルオロチタン酸 55g/L
ヘキサフルオロジルコニウム酸 10g/L
アミノメチル置換ポリビニルフェノール 72g/L
水 残り
リン酸塩混合物 15体積%
硫酸バリウム 5体積%
シリカ 1体積%
クリアー塗料 残り
クロム酸ストロンチウム 15体積%
硫酸バリウム 5体積%
シリカ 1体積%
クリアー塗料 残り
カーボンブラック 7体積%
シリカ粒子1 1体積%
フッ素樹脂系の塗料 残り
カーボンブラック 7体積%
シリカ粒子1 5体積%
アクリル粒子1 5体積%
クリアー塗料1 残り
上記上塗り塗料を塗装原板3の下塗り塗膜の表面に塗布し、塗装原板3における上記めっき鋼板の到達温度が220℃となるように塗装原板3を加熱し、乾燥膜厚Tが25μmの上塗り塗膜を作製した。こうして、塗装金属板1を作製した。
上塗り塗料の塗布量を、乾燥膜厚Tが22μmとなるように変更した以外は、塗装金属板1と同様にして、塗装金属板2を作製した。また、上塗り塗料の塗布量を、乾燥膜厚Tが20μmとなるように変更した以外は、塗装金属板1と同様にして、塗装金属板3を作製した。
上塗り塗料中の光沢調整剤に、シリカ粒子1に代えてシリカ粒子2を用い、艶消し剤にアクリル粒子1に代えてアクリル粒子2を用い、上塗り塗料の塗布量を乾燥膜厚Tが3μmとなるように変更した以外は、塗装金属板1と同様にして、塗装金属板4を作製した。シリカ粒子2は、例えば分級品またはその混合物であり、R1は1.0μmであり、D197.5は2.0μmであり、Ruは、2.6μmである。アクリル粒子2の個数平均粒径R2は、10μmであり、個数粒度分布におけるD297.5は15μmである。
上塗り塗料の塗布量を、乾燥膜厚Tが2μmとなるように変更した以外は、塗装金属板4と同様にして、塗装金属板5を作製した。
上塗り塗料中の光沢調整剤に、シリカ粒子1に代えてシリカ粒子3を用い、上塗り塗料の塗布量を乾燥膜厚Tが40μmとなるように変更した以外は、塗装金属板1と同様にして、塗装金属板6を作製した。シリカ粒子3は、例えば分級品またはその混合物であり、R1は5.0μmであり、D197.5は7.6μmであり、Ruは、9.5μmである。また、上塗り塗料の塗布量を乾燥膜厚Tが41μmとなるように変更した以外は、塗装金属板6と同様にして、塗装金属板7を作製した。
上塗り塗料中の光沢調整剤に、シリカ粒子1に代えてシリカ粒子4を用いた以外は、塗装金属板1と同様にして、塗装金属板8を作製した。シリカ粒子4は、例えば分級品またはその混合物であり、R1は8.2μmであり、D197.5は22.0μmであり、Ruは、31.3μmである。
上塗り塗料中の光沢調整剤に、シリカ粒子1に代えてシリカ粒子8を用い、上塗り塗料中のシリカ粒子の含有量を0.0005体積%に変更した以外は、塗装金属板1と同様にして、塗装金属板12を作製した。シリカ粒子8は、例えば分級品またはその混合物であり、R1は7.0μmであり、D197.5は12.3μmであり、Ruは、20.0μmである。
上塗り塗料中のシリカ粒子の含有量を0.01体積%に変更した以外は、塗装金属板12と同様にして、塗装金属板13を作製した。また、上塗り塗料中のシリカ粒子の含有量を0.1体積%に変更した以外は、塗装金属板12と同様にして、塗装金属板14を作製した。また、上塗り塗料中のシリカ粒子の含有量を5体積%に変更した以外は、塗装金属板12と同様にして、塗装金属板15を作製した。また、上塗り塗料中のシリカ粒子の含有量を15体積%に変更した以外は、塗装金属板12と同様にして、塗装金属板16を作製した。また、上塗り塗料中のシリカ粒子の含有量を16体積%に変更した以外は、塗装金属板12と同様にして、塗装金属板17を作製した。さらに、上塗り塗料中のシリカ粒子の含有量を20体積%に変更した以外は、塗装金属板12と同様にして、塗装金属板18を作製した。
上塗り塗料中の艶消し剤に、アクリル粒子1に代えてアクリル粒子3を用いた以外は、塗装金属板15と同様にして、塗装金属板19を作製した。アクリル粒子3は、懸濁重合によって作製されており、前述の一次粒子に該当する。アクリル粒子3のR2は8.0μmであり、D297.5は12.0μmである。
上塗り塗料中のアクリル粒子の含有量を0.0005体積%に変更した以外は、塗装金属板15と同様にして、塗装金属板25を作製した。また、上塗り塗料中のアクリル粒子の含有量を0.01体積%に変更した以外は、塗装金属板15と同様にして、塗装金属板26を作製した。また、上塗り塗料中のアクリル粒子の含有量を0.1体積%に変更した以外は、塗装金属板15と同様にして、塗装金属板27を作製した。また、上塗り塗料中のアクリル粒子の含有量を13.0体積%に変更した以外は、塗装金属板15と同様にして、塗装金属板28を作製した。また、上塗り塗料中のアクリル粒子の含有量を15.0体積%に変更した以外は、塗装金属板15と同様にして、塗装金属板29を作製した。また、上塗り塗料中のアクリル粒子の含有量を16.0体積%に変更した以外は、塗装金属板15と同様にして、塗装金属板30を作製した。さらに、上塗り塗料中のアクリル粒子の含有量を20.0体積%に変更した以外は、塗装金属板15と同様にして、塗装金属板31を作製した。
塗装原板3に代えて塗装原板1に上塗り塗膜を形成する以外は、塗装金属板15と同様にして、塗装金属板32を作製した。また、塗装原板3に代えて塗装原板2に上塗り塗膜を形成する以外は、塗装金属板15と同様にして、塗装金属板33を作製した。また、塗装原板3に代えて塗装原板4に上塗り塗膜を形成する以外は、塗装金属板15と同様にして、塗装金属板34を作製した。
上塗り塗料中の光沢調整剤に、シリカ粒子1に代えてシリカ粒子9を用いた以外は、塗装金属板34と同様にして、塗装金属板35を作製した。シリカ粒子9は、例えば分級品またはその混合物であり、R1は7.0μmであり、D197.5は12.7μmであり、Ruは、23.3μmである。
上塗り塗料中の艶消し剤に、アクリル粒子1に代えてガラス粒子を用いた以外は、塗装金属板37と同様にして、塗装金属板40を作製した。当該ガラス粒子は、前述の一次粒子に該当する。当該ガラス粒子のR2は20.0μmであり、D297.5は30.0μmである。
塗装原板3に代えて塗装原板5に上塗り塗膜を形成し、上塗り塗料の塗布量を、乾燥膜厚Tが10μmとなるように変更し、上塗り塗料中の光沢調整剤に、シリカ粒子1に代えてシリカ粒子12を用いた以外は、塗装金属板1と同様にして、塗装金属板41を作製した。シリカ粒子12は、例えば分級品またはその混合物であり、R1は3.0μmであり、D197.5は6.1μmであり、Ruは、12.0μmである。
塗装金属板1〜41のそれぞれについて、下記の測定および試験を行った。
塗装金属板1〜41のそれぞれの、JIS K5600−4−7(ISO 2813:1994)で規定される60°における鏡面光沢度(G60)を日本電色株式会社製 光沢計VG−2000によって測定した。
塗装金属板1〜41のそれぞれの、乾燥後の上塗り塗膜の外観を、以下の基準により評価した。
(評価基準)
G:光沢異常および塗膜欠陥が認められず、フラットであり、また艶消し外観が認められる
NG1:光沢が高すぎ、艶消し外観が得られない(光沢度が15より大きい)
NG2:隠蔽性不足
塗装金属板1〜41のそれぞれに125μmφダイヤモンド針を使用し、400gの荷重を加えてクレメンス型引っ掻き試験を行い、下記の基準で評価した。
(評価基準)
G:素地(金属板)に到達する傷が認められない
NG:素地(金属板)に到達する傷が認められる
作製から24時間経過後の塗装金属板1〜41のそれぞれに2T曲げ(密着曲げ)加工を施し、当該2T曲げ部のセロハンテープ剥離試験を行い、上塗り塗膜における当該試験を施した部分に対する剥離した部分の面積比率(%)に応じて、以下の基準により評価した。
(評価基準)
A:塗膜のクラックが認められない(0%)
B:塗膜のクラックが3%以下
C:塗膜のクラックが5%以下
NG:塗膜の5%を超える剥離が認められる
塗装金属板1〜41のそれぞれについて、まずJIS K5600−7−7(ISO 11341:2004)に規定されているキセノンランプ法促進耐候性試験を1,000時間行い、次いで、JIS H8502に規定されている「中性塩水噴霧サイクル試験」(いわゆるJASO法)を720時間行った。上記二つの試験の実施を1サイクルとし、塗装金属板1〜41のそれぞれについて、1サイクル(実使用の耐久年数が5年程度に相当)試験品と、2サイクル(実使用の耐久年数10年程度に相当)試験品のそれぞれを水洗し、目視、および、10倍ルーペによる拡大観察によって、塗装金属板の平坦部における塗膜の膨れの有無を観察し、以下の基準により評価した。AまたはBであれば、実用上問題ない。
(評価基準)
A:膨れが認められない
B:拡大観察で僅かに微小な膨れが認められるが、目視では当該膨れが認められない
C:目視で膨れが認められる
塗装金属板15、34、35および36のそれぞれについて、平坦部耐食性に係る前述の試験を3サイクル(実使用の耐久年数15年程度に相当)まで行い、3サイクル試験品のそれぞれを水洗し、目視、および、10倍ルーペによる拡大観察によって、塗装金属板の平坦部における塗膜の膨れの有無を観察し、前述の基準により評価した。結果を表5に示す。
シリカ粒子1から粒径R1’が0.7Tμm(T=25μm)以上の粒子を除去し、17.5μm以上の粒子を実質的に含まないシリカ粒子1を得た。これをシリカ粒子13とする。そして、上塗り塗料中の光沢調整剤に、シリカ粒子1に代えてシリカ粒子13を用いた以外は、塗装金属板1と同様にして、塗装金属板42を作製した。
シリカ粒子18におけるシリカ粒子13とシリカ粒子Eとの含有比率を変更して、0.7T以下のシリカ粒子8の97.0体積部と、1.2T以下のシリカ粒子Eの3.0体積部とから構成されるシリカ粒子を得た。これをシリカ粒子20とする。そして、上塗り塗料中の光沢調整剤に、シリカ粒子1に代えてシリカ粒子20を用いた以外は、塗装金属板1と同様にして、塗装金属板49を作製した。
塗装金属板48の上塗り塗料を、艶消し剤を配合する前にシリカ粒子Fを粉砕する条件でローラーミルによって処理した以外は、塗装金属板48と同様にして、塗装金属板51を作製した。そして、塗装金属板51について、前述した方法で平坦部耐食性を評価したところ、1サイクルおよび2サイクルのいずれの判定もBであった。
Claims (12)
- 金属板と、前記金属板上に配置される上塗り塗膜とを有する塗装金属板を製造する方法であって、
フッ素樹脂、光沢調整剤および艶消し剤を含有する上塗り塗料を前記金属板上に塗布する工程と、
前記上塗り塗料の塗膜を硬化して前記上塗り塗膜を形成する工程と、
を含み、
前記上塗り塗膜における前記光沢調整剤の含有量は、0.01〜15体積%であり、
前記上塗り塗膜における前記艶消し剤の含有量は、0.01〜15体積%であり、
前記光沢調整剤は、細孔を有する粒子であり、
前記艶消し剤は、一次粒子であり、
前記光沢調整剤の個数平均粒径をR(μm)、前記上塗り塗膜の膜厚をT(μm)、前記光沢調整剤の個数基準の累積粒度分布における97.5%粒子径をD197.5(μm)、前記艶消し剤の個数基準の累積粒度分布における97.5%粒子径をD297.5(μm)、前記光沢調整剤の個数粒度分布における上限粒径をRu(μm)、としたときに、下記式を満足する前記光沢調整剤および前記艶消し剤を用いる、塗装金属板の製造方法。
D197.5/T≦0.9
Ru≦1.2T
R≧1.0
0.5≦D297.5/T≦7.0
3≦T≦40 - 前記Ruは、前記T未満である、請求項1に記載の塗装金属板の製造方法。
- 前記金属板は、非クロメート防錆処理が施されており、
前記塗装金属板は、クロメートフリーである、
請求項1または2に記載の塗装金属板の製造方法。 - 前記金属板は、クロメート防錆処理が施されている、請求項1または2に記載の塗装金属板の製造方法。
- 前記光沢調整剤は、シリカ粒子である、請求項1〜4のいずれか一項に記載の塗装金属板の製造方法。
- 前記金属板および前記上塗り塗膜の間に下塗り塗膜をさらに有する、請求項1〜5のいずれか一項に記載の塗装金属板の製造方法。
- 前記下塗り塗膜および前記上塗り塗膜の間に中塗り塗膜をさらに有する、請求項6に記載の塗装金属板の製造方法。
- 前記上塗り塗膜は、ポリフッ化ビニリデンとアクリル樹脂とからなる主成分としての樹脂成分によって構成されている、請求項1〜7のいずれか一項に記載の塗装金属板の製造方法。
- 60°における光沢度が0.1〜15である、請求項1〜8のいずれか一項に記載の塗装金属板の製造方法。
- 前記塗装金属板が外装用塗装金属板である、請求項1〜9のいずれか一項に記載の塗装金属板の製造方法。
- 前記上塗り塗料は、前記上塗り塗料中の粒子を粉砕する処理が施された、請求項1〜10のいずれか一項に記載の塗装金属板の製造方法。
- 請求項1〜11のいずれか一項に記載の塗装金属板の製造方法で製造された塗装金属板で構成されている外装建材。
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