JPWO2018186474A1 - 塗膜の耐傷付き性及び耐吸湿性が良好で端面赤錆耐食性に優れるプレコート鋼板 - Google Patents
塗膜の耐傷付き性及び耐吸湿性が良好で端面赤錆耐食性に優れるプレコート鋼板 Download PDFInfo
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Abstract
Description
また、特許文献5には、親水化処理した塗膜にワックスを添加し、ワックスの塗膜表面への投影面積比率をコントロールすることにより、ワックスによる優れた成形性を発現させるとともに、テトラアルコキシシランの部分加水分解縮合物による優れた耐雨だれ汚染性向上も発現させることが提案されている。特許文献5に記載の塗装鋼板では、鋼板の端面耐食性は考慮されていない。
片面の最上層塗膜は下記(1)〜(5)の条件:
(1)最上層塗膜表面の水に対する接触角が65〜75°、
(2)最上層塗膜の膜厚が0.5〜5μm、
(3)最上層塗膜が第1の顔料を含み、前記顔料の含有量が乾燥塗膜質量に対し15〜70質量%、
(4)前記第1の顔料のうち、平均一次粒径1μm以上のものの合計量が乾燥塗膜質量に対し5質量%以上、及び
(5)最上層塗膜が、平均粒径1〜8μmの粒状ワックスを乾燥塗膜質量に対し1〜10質量%の含有量で含有しており、粒状ワックス粒子のうちの少なくとも一部は塗膜表面から部分的に突出した状態で存在する、
を満たし
かつ該最上層塗膜に隣接する下層塗膜は、端面の赤錆発生の防止に有効な1種又は2種以上の潮解性の防錆顔料である第2の顔料を含有していることを特徴とする、クロメートフリー型プレコート鋼板。
〔2〕前記ワックスが、PTFEワックス、ポリエチレン/PTFE共分散ワックス、ならびに高分子ポリエチレンワックスよりなる群から選ばれることを特徴とする、上記〔1〕に記載のクロメートフリー型プレコート鋼板。
〔3〕前記第2の顔料が、タングステン酸塩及びケイ酸塩、アルカリ金属のリン酸塩及び塩化物、並びにアルカリ土類金属の次亜リン酸塩よりなる群から選ばれることを特徴とする、上記〔1〕または〔2〕に記載のクロメートフリー型プレコート鋼板。
〔4〕前記タングステン酸塩が、タングステン酸ナトリウム、タングステン酸カルシウム、タングステン酸アンモニウム、タングステン酸リチウム、タングステン酸マグネシウム又はそれらの混合物であることを特徴とする、上記〔3〕に記載のクロメートフリー型プレコート鋼板。
〔5〕前記ケイ酸塩が、ケイ酸ナトリウム、ケイ酸カリウム、ケイ酸リチウム又はそれらの混合物であることを特徴とする、上記〔3〕に記載のクロメートフリー型プレコート鋼板。
〔6〕前記アルカリ金属リン酸塩が、リン酸二水素ナトリウム、リン酸二水素カリウム、リン酸水素二カリウム、トリポリリン酸ナトリウム、リン酸二水素ナトリウム一水和物、リン酸二水素ナトリウム二水和物又はそれらの混合物であることを特徴とする、上記〔3〕に記載のクロメートフリー型プレコート鋼板。
〔7〕前記アルカリ金属塩化物が塩化ナトリウムであることを特徴とする、上記〔3〕に記載のクロメートフリー型プレコート鋼板。
〔8〕前記次亜リン酸塩が次亜リン酸カルシウムであることを特徴とする、上記〔3〕に記載のクロメートフリー型プレコート鋼板。
本発明においては、最上層塗膜が、以下の(1)〜(5)、特に(5)の条件を満たすことが重要である。
(1)最上層塗膜表面の水に対する接触角が65〜75°、
(2)最上層塗膜の膜厚が0.5〜5μm、
(3)最上層塗膜が第1の顔料を含み、第1の顔料の含有量が乾燥塗膜質量に対し15〜70質量%、
(4)第1の顔料のうち、平均一次粒径1μm以上のものの合計量が乾燥塗膜質量に対し5質量%以上、及び
(5)最上層塗膜が、平均粒径1〜8μmの粒状ワックスを乾燥塗膜質量に対し1〜10質量%の含有量で含有しており、粒状ワックス粒子のうちの少なくとも一部は塗膜表面から部分的に突出した状態で存在しており、かつ該最上層塗膜に隣接する下層塗膜は、端面の赤錆発生の防止に有効な1種又は2種以上の潮解性の防錆顔料である第2の顔料を含有している。
それゆえ、本発明のプレコート鋼板においては、この条件に従って、最上層塗膜においてワックス粒子のうちの少なくとも一部分が塗膜表面から部分的に突出した状態で、島状に分散して点在する。これにより、最上層塗膜表面の大部分は水透過性が失われず、そのためプレコート鋼板が水に濡れたときに防錆剤が最上層塗膜を通り抜けて溶出でき、十分な端面赤錆耐食性が担保される。
(1)塗膜表面の水に対する接触角が65〜75°、
(2)塗膜の膜厚が0.5〜5μm、
(3)塗膜が第1の顔料を含み、第1の顔料の含有量が乾燥塗膜質量に対し15〜70質量%、及び
(4)前記第1の顔料のうち、平均一次粒径1μm以上のものの合計量が乾燥塗膜質量に対し5質量%以上、
という条件を満たす必要がある。ここでの「第1の顔料」とは、着色や、あるいは防錆などを目的とした顔料全体をいうが、下層に存在する潮解性の防錆顔料は含まない。また、乾燥塗膜質量(塗膜の乾燥状態での質量)を構成する成分として、バインダー、顔料、およびビーズなどの他の成分が挙げられる。ここで言う膜厚は、当該塗膜層の平均膜厚、すなわち最上層塗膜層の粒状ワックスの突出部分を除いた表面と下層塗膜との界面との距離の平均である。膜厚は上述の下層塗膜の膜厚測定の際に併せて行うことができる。なお、下層塗膜に添加した第2の顔料の防錆顔料の粒径が大きく下層塗膜の樹脂から最上層塗膜中に突出している場合は、その突出した顔料表面を下層塗膜層との界面とみなす。
作製した実施例および比較例のプレコート鋼板から切り出した50×100mmの試験片を、様々な温度と相対湿度に調整した試験環境に30分間暴露して、裏面の吸湿による塗膜の濡れを観察した。結果は図1(a)〜(c)に示す3パターンに集約され、それぞれ◎、○、×と評価した。試験結果の要約を表2に示す。
各試験片の裏面塗膜への高湿度条件下での貼付材の接着性を試験した。各試験片を20℃、相対湿度95%の環境に30分間放置後、試験片の塗膜にエアコン分野で用いられている貼付材(粘着テープ)(15mm幅)を貼り付け、その直後に貼付材の一端をばねばかりで塗膜表面に対して垂直方向に引っ張って剥離荷重を測定した。剥離荷重が1.96N以上の場合を○、1.96N未満の場合を×と評価した。結果を表2に示す。
蒸留水浸漬試験を行った。蒸留水浸漬試験によって、非電解質の湿潤環境下で短期間に発生する赤錆に対する耐性を簡易的に評価できることが分かっている。実施例および比較例の各プレコート鋼板について、10×40mmの試験片20枚をそれぞれ、直径80mmのシャーレに入れた蒸留水40mlに浸漬して、端面の赤錆発生の推移を観察した。
プレコート鋼板を積み重ねたりコイルに巻いた状態で輸送した時に、表裏塗膜の摺動により発生する表裏塗膜への耐傷付き性や、ユーザーでの成形加工時に発生する塗膜の耐かじり性を、以下の方法で評価した。各実施例および比較例のプレコート鋼板を50×50mmに切断したものを2枚用意し、1枚のオモテ面ともう1枚の裏面とを重ね合わせ、上下から98Nの荷重でプレスした状態で、一方の鋼板を90°回転させた後、荷重を開放し、擦られた両塗装面を観察した。
両塗装面とも塗膜に傷が入っていない場合を◎、
いずれか一方の面の塗膜に傷は見られるが原板の露出には至っていない場合を○、
両方の面の塗膜に傷は見られるがいずれも原板の露出には至っていない場合を○〜△、
両方の面の塗膜に傷が見られ裏面は原板の露出には至っているがオモテ面は原板の露出には至っておらず傷がトップ層内でとどまりプライマー層にまで到達していない場合を△、
両方の面の塗膜に傷が見られ裏面は原板の露出には至っているがオモテ面は原板の露出には至っていないものの傷がプライマー層にまで到達している場合を△−、
両方の面の塗膜に原板の露出に至る傷が見られる場合を×
と評価した。評価が△以上である場合を合格とした。結果を表2に示す。
Claims (8)
- 亜鉛系めっき鋼板の両面にクロメートフリー型化成処理層と、その上に形成した、最上層塗膜及びそれに隣接した下層塗膜を少なくとも含む複数の塗膜とを有するクロメートフリー型プレコート鋼板であって、
片面の最上層塗膜は下記(1)〜(5)の条件:
(1)最上層塗膜表面の水に対する接触角が65〜75°、
(2)最上層塗膜の膜厚が0.5〜5μm、
(3)最上層塗膜が第1の顔料を含み、前記顔料の含有量が乾燥塗膜質量に対し15〜70質量%、
(4)前記第1の顔料のうち、平均一次粒径1μm以上のものの合計量が乾燥塗膜質量に対し5質量%以上、及び
(5)最上層塗膜が、平均粒径1〜8μmの粒状ワックスを乾燥塗膜質量に対し1〜10質量%の含有量で含有しており、粒状ワックス粒子のうちの少なくとも一部は塗膜表面から部分的に突出した状態で存在する、
を満たし
かつ該最上層塗膜に隣接する下層塗膜は、端面の赤錆発生の防止に有効な1種又は2種以上の潮解性の防錆顔料である第2の顔料を含有していることを特徴とする、クロメートフリー型プレコート鋼板。 - 前記ワックスが、PTFEワックス、ポリエチレン/PTFE共分散ワックス、ならびに高分子ポリエチレンワックスよりなる群から選ばれることを特徴とする、請求項1に記載のクロメートフリー型プレコート鋼板。
- 前記第2の顔料が、タングステン酸塩及びケイ酸塩、アルカリ金属のリン酸塩及び塩化物、並びにアルカリ土類金属の次亜リン酸塩よりなる群から選ばれることを特徴とする、請求項1または2に記載のクロメートフリー型プレコート鋼板。
- 前記タングステン酸塩が、タングステン酸ナトリウム、タングステン酸カルシウム、タングステン酸アンモニウム、タングステン酸リチウム、タングステン酸マグネシウム又はそれらの混合物であることを特徴とする、請求項3に記載のクロメートフリー型プレコート鋼板。
- 前記ケイ酸塩が、ケイ酸ナトリウム、ケイ酸カリウム、ケイ酸リチウム又はそれらの混合物であることを特徴とする、請求項3に記載のクロメートフリー型プレコート鋼板。
- 前記アルカリ金属リン酸塩が、リン酸二水素ナトリウム、リン酸二水素カリウム、リン酸水素二カリウム、トリポリリン酸ナトリウム、リン酸二水素ナトリウム一水和物、リン酸二水素ナトリウム二水和物又はそれらの混合物であることを特徴とする、請求項3に記載のクロメートフリー型プレコート鋼板。
- 前記アルカリ金属塩化物が塩化ナトリウムであることを特徴とする、請求項3に記載のクロメートフリー型プレコート鋼板。
- 前記次亜リン酸塩が次亜リン酸カルシウムであることを特徴とする、請求項3に記載の鋼板。
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PCT/JP2018/014622 WO2018186474A1 (ja) | 2017-04-05 | 2018-04-05 | 塗膜の耐傷付き性及び耐吸湿性が良好で端面赤錆耐食性に優れるプレコート鋼板 |
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JPH09323376A (ja) * | 1996-06-06 | 1997-12-16 | Sumitomo Metal Ind Ltd | 着色潤滑処理鋼板およびその製造法 |
JP2007223556A (ja) * | 2006-02-27 | 2007-09-06 | Nisshin Steel Co Ltd | シートレール |
JP2010083075A (ja) * | 2008-10-01 | 2010-04-15 | Sumitomo Metal Ind Ltd | 耐端面赤錆性に優れたクロムフリー塗装鋼板 |
WO2011071175A1 (ja) * | 2009-12-07 | 2011-06-16 | 新日本製鐵株式会社 | 端面赤錆耐食性に優れたクロメートフリー型プレコート鋼板 |
JP2013018263A (ja) * | 2011-07-14 | 2013-01-31 | Nippon Steel & Sumitomo Metal Corp | 塗装鋼板 |
JP2016193593A (ja) * | 2015-04-01 | 2016-11-17 | 新日鐵住金株式会社 | 耐吸湿性に優れる塗膜を有する端面赤錆耐食性に優れたクロメートフリー型プレコート鋼板 |
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JP2009045923A (ja) | 2007-07-24 | 2009-03-05 | Sumitomo Metal Ind Ltd | 耐端面赤錆性に優れたクロムフリー塗装鋼板 |
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2018
- 2018-04-05 JP JP2019511308A patent/JP6760489B2/ja active Active
- 2018-04-05 CN CN201880023350.6A patent/CN110520290A/zh active Pending
- 2018-04-05 WO PCT/JP2018/014622 patent/WO2018186474A1/ja active Application Filing
- 2018-04-05 KR KR1020197028487A patent/KR20190125377A/ko not_active Application Discontinuation
- 2018-04-05 SG SG11201908797V patent/SG11201908797VA/en unknown
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JPH09143423A (ja) * | 1995-11-21 | 1997-06-03 | Sumitomo Metal Ind Ltd | 金属板用塗料組成物及びそれを用いた樹脂被覆金属板とその製造方法 |
JPH09323376A (ja) * | 1996-06-06 | 1997-12-16 | Sumitomo Metal Ind Ltd | 着色潤滑処理鋼板およびその製造法 |
JP2007223556A (ja) * | 2006-02-27 | 2007-09-06 | Nisshin Steel Co Ltd | シートレール |
JP2010083075A (ja) * | 2008-10-01 | 2010-04-15 | Sumitomo Metal Ind Ltd | 耐端面赤錆性に優れたクロムフリー塗装鋼板 |
WO2011071175A1 (ja) * | 2009-12-07 | 2011-06-16 | 新日本製鐵株式会社 | 端面赤錆耐食性に優れたクロメートフリー型プレコート鋼板 |
JP2013018263A (ja) * | 2011-07-14 | 2013-01-31 | Nippon Steel & Sumitomo Metal Corp | 塗装鋼板 |
JP2016193593A (ja) * | 2015-04-01 | 2016-11-17 | 新日鐵住金株式会社 | 耐吸湿性に優れる塗膜を有する端面赤錆耐食性に優れたクロメートフリー型プレコート鋼板 |
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WO2018186474A1 (ja) | 2018-10-11 |
SG11201908797VA (en) | 2019-10-30 |
CN110520290A (zh) | 2019-11-29 |
KR20190125377A (ko) | 2019-11-06 |
JP6760489B2 (ja) | 2020-09-23 |
SG10201914074YA (en) | 2020-03-30 |
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