JP2008260809A - コーティング剤 - Google Patents
コーティング剤 Download PDFInfo
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- JP2008260809A JP2008260809A JP2007102955A JP2007102955A JP2008260809A JP 2008260809 A JP2008260809 A JP 2008260809A JP 2007102955 A JP2007102955 A JP 2007102955A JP 2007102955 A JP2007102955 A JP 2007102955A JP 2008260809 A JP2008260809 A JP 2008260809A
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- Prior art keywords
- rubber
- weight
- coating agent
- polybutadiene
- wax
- Prior art date
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/06—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
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- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B25/042—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
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- C—CHEMISTRY; METALLURGY
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Abstract
【解決手段】セルロース誘導体、イソシアネート基含有1,2-ポリブタジエン、軟化点100〜150℃の合成ワックス、軟化点60〜170℃の脂肪酸アミドおよびグラファイトを含有してなるコーティング剤。
【選択図】 なし
Description
(1) コーティング剤の塗布性に優れている
(2) 表面処理したゴム同士のブロッキングがない
(3) 表面処理したゴムの表面は、低摩擦、低摺動となり、装着作業性に優れている
(4) コーティング剤とゴムの官能基との間に化学的結合が多く形成され、その結果低摩擦、低摺動といった所望性能に持続性があり、またゴムの摩耗を低減できるばかりではなく、表面処理したゴムの耐久性や高温での非粘着性が発揮されることにより、金属との粘着性や固着性が少なくなり、高温時においても同様の効果がみられる
(5) 塗布厚みを薄くしても(10μm以下)、塗布ムラがなく、低コストで処理が可能であるばかりではなく、ゴム特性、滑り性、非粘着性を低下させることなく、柔軟性があり、特にシール部品の場合にはシール性に優れている
(6) シリコーン樹脂、シリコーンゴム、シリコーンオイルなどを含まないため、電気接点不具合の恐れがある部位にも使用可能である
(7) ポリブタジエン誘導体、セルロース誘導体とワックスおよびグラファイトからなるため、アウトガス性や汚染性の心配がなく、IT関連部品に使用が可能である
(8) 従来のフッ素樹脂を含有する処理皮膜は硬く、シール部品ではシール性能低下や圧縮-解放繰り返しによる皮膜のクラックや剥がれがみられたが、本発明のポリブタジエン誘導体(およびワックス)を含有することにより、皮膜に柔軟性が付与され、これら問題が解消される
(9) セルロース誘導体の含有により、塗布性が向上し、またセルロース誘導体およびイソシアネート基含有1,2-ポリブタジエンの反応により、皮膜の強度が向上し、ポリブタジエンの粘着を防止することができ、高温での耐摩擦・摩耗特性が向上する。
メチルセルロース(信越化学製品) 10%トルエン溶液 130(13)重量部
イソシアネート基含有1,2-ポリブタジエン 65(32.5) 〃
(日本曹達製品TP1001;50%酢酸ブチル溶液)
サゾールワックス 73(10.95) 〃
(サゾール社製品、軟化点110℃、粒子径2μm以下;15%トルエン溶液)
オレイン酸アミド(日本化成製品ダイヤミッドO-200、 73(10.95) 〃
軟化点75℃、粒子径2μm以下;15%トルエン溶液)
グラファイト(日電カーボン製品C-1) 7.8(7.8) 〃
トルエン 653 〃
以上のコーティング剤各成分(溶液濃度は重量%であり、カッコ内の値は固形分重量部である)を混合し、このトルエン溶液(固形分濃度7.5重量%)を圧縮成形したシート(60×25×2mm)、Oリング(内径119.6mm、太さ7mm径、呼び番号P120)およびオイルシール(内径85mm、外径105mm、幅13mm)の各加硫フッ素ゴム部材に、スプレーを用いてコーティング剤を約5μmの厚さで塗布し、200℃で2分間加熱処理した後、動摩擦測定試験、ゴムシート同士の室温下における粘着試験、Oリングのリーク試験、オイルシール回転試験を行った。
ゴムシート同士の室温粘着試験:加硫フッ素ゴム製シート貼り合わせ部分15mm角に、上記表面加工を施し、貼り合わせ部分のゴム同士を40℃、湿度95%の恒温恒湿槽において、面圧0.15kg/cm2で24時間圧着した後、室温下でJIS K6850の引張せん断接着強さ試験法に従い、引張せん断接着強さ試験片の引張強さを測定し、表面の粘着力を評価
Oリングのリーク試験:加硫フッ素ゴム製Oリングに、上記表面処理を施し、Oリングを5%圧縮し、ヘリウムリークディテクタにて、ヘリウムガス注入3分後のヘリウム漏れ量を測定
オイルシール回転試験:加硫フッ素ゴム製オイルシールのリップ面に、上記コーティング処理を施し、試験温度100℃、回転数2000rpmの条件下に、油密封状態で試験開始1時間後の油漏れがあるか、コーティング膜の剥がれがあるか否かを確認した。
アルカリ脱脂した厚さ0.2mmのステンレス鋼板(日新製鋼製品SUS301)の表面に、チタンテトラ(アセチルアセトネート)1.0重量部、アルコキシシラン加水分解縮合物2.5重量部、水10.0重量部およびメタノール86.5重量部を混合し、数分間撹拌することにより得られるシラン系プライマーを用い、浸せき法で塗布し、加熱空気で乾燥させた後、約200℃で5分間焼付け処理され、プライマー層(目付量:250mg/m2)が形成された。なお、ここで用いられたアルコキシシラン加水分解縮合物は、次のようにして製造された。
(NBR組成物)
NBR(JSR製品N235S;ニトリル含量36%) 100重量部
SRFカーボンブラック 80 〃
ホワイトカーボン(日本シリカ製品ニップシールLP) 40 〃
酸化亜鉛 5 〃
ステアリン酸 2 〃
老化防止剤(大内新興化学製品Nocrac 224) 2 〃
(N-イソプロピル-N′-フェニル-p-フェニレンジアミン)
トリアリルイソシアヌレート(日本化成製品タイク) 2 〃
1,3-ビス第3ブチルパーオキシイソプロピルベンゼン 7.5 〃
(三建化工製品サンペロックスTY-13)
動摩擦測定試験:上記の如く表面処理されたゴム金属積層体について、JIS K7125、P8147に準じ、新東科学製表面性試験機を用いて、相手材として直径10mmのクロム鋼球摩擦子を用い、移動速度50mm/分、荷重50gの条件下で動摩擦係数を測定
アルミニウム板との高温粘着試験:ゴム金属積層体のゴム層の貼り合わせ部分となる25mm角の貼り合わせ部分を、200℃、72時間、200kgf/cm2(19.6MPa)の条件下でアルミニウム板(厚さ20mm)と圧着し、室温下でJIS K6850の引張せん断接着強さ試験法に従い、引張せん断接着強さ試験片の引張強さを測定し、表面の粘着力を評価
高温摩擦・摩耗試験:JIS K7125、P8147に準じ、新東科学製表面性試験機を用い、相手材として直径10mmの硬質クロムめっき製鋼球摩擦子を用い、移動速度400mm/分、往復動移動幅30mm、150℃、荷重2.5kgの条件下における往復動試験により、摩擦摩耗評価を行い、ゴムが摩耗して接着層が露出するまでの回数を測定
実施例1において、イソシアネート基含有1,2-ポリブタジエンの代わりに水酸基含有1,2-ポリブタジエン(日本曹達製品G-1000)19.5(19.5)重量部およびイソシアネート(バイエル製品Desmodur R)13(13)重量部が、またトルエン量が685重量部にそれぞれ変更されて用いられた。
実施例1において、グラファイト量が21.7重量部に、またトルエン量が825重量部にそれぞれ変更されて用いられた。
実施例1において、サゾールワックス量が44重量部に、オレイン酸アミド量が102重量部にそれぞれ変更されて用いられた。
表1
実施例
1 2 3 4
〔皮膜中の固形物成分重量比率(%)〕
メチルセルロース 17.3 17.3 14.6 17.3
NCO基含有ポリブタジエン 43.2 43.3 36.5 43.2
ポリエチレンワックス 29.1 29.0 24.6 29.1
グラファイト 10.4 10.4 24.4 10.4
〔評価結果〕
室温粘着試験
引張強さ (kgf) <0.1 <0.1 <0.1 <0.1
Oリングリーク試験
He漏れ量(×10-11 Pa・m3/秒) 5 10 10 5
オイルシール回転試験
漏れの有無 無 無 無 無
コーティング膜剥がれの有無 無 無 無 無
動摩擦測定試験
動摩擦係数 0.2 0.1 0.1 0.1
アルミ板との高温粘着試験
表面粘着力 (kgf) 40 <0.1 <0.1 10
高温摩擦・摩耗試験
接着層が露出するまでの回数 300 350 500 250
注) <0.1は検出限界以下を示している(0.1は測定可)
実施例1において、サゾールワックスおよびオレイン酸アミドが用いられず、パラフィンワックス(精工化成製品、軟化点60℃、粒子径2μm以下;15%トルエン溶液)145(21.75)重量部が用いられた。
実施例1において、サゾールワックスおよびオレイン酸アミドが用いられず、ポリエチレンワックス(三井化学製品、分子量2000、軟化点110℃、粒子径1μm;15%トルエン溶液)145(21.75)重量部が用いられた。
実施例1において、サゾールワックス量が145(21.75)重量部に変更され、またオレイン酸アミドが用いられなかった。
実施例1において、サゾールワックスが用いられず、オレイン酸アミド量が145(21.75)重量部に変更されて用いられた。
実施例1において、サゾールワックスおよびオレイン酸アミドが用いられず、エチレンビスステアリン酸アミド(日本化成製品スリッパクスE、軟化点140℃、粒子径2μm以下;15%トルエン溶液)145(21.75)重量部が用いられた。
実施例1において、サゾールワックスおよびオレイン酸アミドが用いられず、グラファイト量が21.7(21.7)重量部に、またトルエン量が679重量部に変更されて用いられた。
実施例1において、グラファイトが用いられず、トルエン量が558重量部に変更されて用いられた。
実施例1において、メチルセルロースが用いられず、イソシアネート基含有1,2-ポリブタジエン量が88(44)重量部に、グラファイト量が7.5(7.5)重量部に、またトルエン量が737重量部に変更されて用いられた。
実施例1において、イソシアネート基含有1,2-ポリブタジエンが用いられず、メチルセルロース量が441(44.1)重量部に、グラファイト量が7.5(7.5)重量部に、またトルエン量が385重量部にそれぞれ変更されて用いられた。
表2
比較例
1 2 3 4 5 6 7 8 9
〔皮膜中の固形物成分重量比率(%)〕
メチルセルロース 17.3 17.3 17.3 17.3 17.3 19.3 19.3 − 60.0
NCO基含有ポリブタジエン 43.3 43.3 43.3 43.3 43.3 48.4 48.2 59.9 −
ポリエチレンワックス 29.0 29.0 29.0 29.0 29.0 − 32.5 29.8 29.8
グラファイト 10.4 10.4 10.4 10.4 10.4 32.3 − 10.2 10.2
〔評価結果〕
室温粘着試験
引張強さ (kgf) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 50 120 <0.1
Oリングリーク試験
He漏れ量(×10-11 Pa・m3/秒) 5 5 100 5 500 104 5 5 10
オイルシール回転試験
漏れの有無 無 無 無 無 無 有 無 無 無
コーティング膜剥がれの有無 有 無 無 有 無 有 無 有 有
動摩擦測定試験
動摩擦係数 0.2 0.2 0.2 0.1 0.4 0.5 0.4 0.4 0.3
アルミ板との高温粘着試験
表面粘着力 (kgf) 100 10 200 <0.1 10 170 150 250 300
高温摩擦・摩耗試験
接着層が露出するまでの回数 70 100 350 60 80 20 90 70 2
Claims (8)
- セルロース誘導体、イソシアネート基含有1,2-ポリブタジエン、軟化点100〜150℃の合成ワックス、軟化点60〜170℃の脂肪酸アミドおよびグラファイトを含有してなるコーティング剤。
- 形成した皮膜中の各固形物成分が、セルロース誘導体が5〜40重量%、イソシアネート基含有1,2-ポリブタジエンが20〜70重量%、合成ワックスおよび脂肪酸アミドの合計量が5〜50重量%、またグラファイトが5〜50重量%である請求項1記載のコーティング剤。
- 合成ワックスが、サゾールワックスである請求項1または2記載のコーティング剤。
- 弾性体の表面に適用して用いられる請求項1、2または3記載のコーティング剤。
- 請求項4記載のコーティング剤で表面処理された弾性体。
- 表面処理された弾性体がシール材である請求項5記載の弾性体。
- ゴム金属積層体のゴム表面に適用して用いられる請求項1、2または3記載のコーティング剤。
- 請求項7記載のコーティング剤でゴム表面が被覆処理されたゴム金属積層体。
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WO2018105531A1 (ja) | 2016-12-06 | 2018-06-14 | ニチアス株式会社 | ゴム被覆シリンダヘッドガスケット用コーティング剤及びシリンダヘッドガスケット |
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US10752804B2 (en) | 2014-06-24 | 2020-08-25 | Nichias Corporation | Coating agent |
KR20180089484A (ko) | 2016-01-15 | 2018-08-08 | 니찌아스 카부시키카이샤 | 코팅제, 표면 피복 탄성체 및 표면 피복 고무 금속 적층체 |
US10640677B2 (en) | 2016-01-15 | 2020-05-05 | Nichias Corporation | Coating agent, surface-coated elastic body, and surface-coated rubber metal laminate |
WO2018105531A1 (ja) | 2016-12-06 | 2018-06-14 | ニチアス株式会社 | ゴム被覆シリンダヘッドガスケット用コーティング剤及びシリンダヘッドガスケット |
US11193040B2 (en) | 2016-12-06 | 2021-12-07 | Nichias Corporation | Coating agent for rubber-coated cylinder head gasket and cylinder head gasket |
Also Published As
Publication number | Publication date |
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CN101652440B (zh) | 2013-02-06 |
EP2135903B1 (en) | 2012-06-20 |
CN101652440A (zh) | 2010-02-17 |
WO2008126741A1 (ja) | 2008-10-23 |
JP5130772B2 (ja) | 2013-01-30 |
EP2135903A1 (en) | 2009-12-23 |
US20100136352A1 (en) | 2010-06-03 |
US9156998B2 (en) | 2015-10-13 |
EP2135903A4 (en) | 2010-07-21 |
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