JP2023541232A - 減摩コーティング組成物 - Google Patents
減摩コーティング組成物 Download PDFInfo
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- JP2023541232A JP2023541232A JP2023513526A JP2023513526A JP2023541232A JP 2023541232 A JP2023541232 A JP 2023541232A JP 2023513526 A JP2023513526 A JP 2023513526A JP 2023513526 A JP2023513526 A JP 2023513526A JP 2023541232 A JP2023541232 A JP 2023541232A
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- coating formulation
- composition
- resin
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- friction coating
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- INILCLIQNYSABH-UHFFFAOYSA-N cobalt;sulfanylidenemolybdenum Chemical compound [Mo].[Co]=S INILCLIQNYSABH-UHFFFAOYSA-N 0.000 description 1
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- 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
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Abstract
Description
なし
(a)可溶性樹脂と、
(b)不溶性ポリマーと、
(c)任意選択的に固体潤滑剤と、
(d)溶媒と
を含む、組成物。
ボールオンプレート摩耗試験:
ボールオンプレート摩耗試験は、ASTM G-133に従って行った。図2に関連して、直径1/2インチの鋼球(11)を、鋼(又は他の材料)クーポンに塗布されている、減摩コーティング(21)と10Nの力で接触させた。試験試料を4mmのストローク長で前後に合計10,000回通過(つまり、5000サイクル)の間往復させる際に、荷重を試験の全体にわたって維持した。ASTM G-133からの試験セットアップ(1)の幾何学的配置を、参考のために図2に示す。
用いられる第2のトライボロジー試験は、LFW-1、つまりブロックオンリング試験(ASTM-D 2714)である。(図1を参照されたい)。これは、72rpmで比較的高い荷重(2,860N)下に行われるドライテストであり、その試験では、上方のブロックがコートされたリングと印加荷重下で接触させられ、摩耗表面が(上方のブロックの幅の)リングの外面積であるように、リングがブロックの下で回転させられる。この試験は、最初の10分にわたって荷重を増加させ、コーティングが破損し、そして摩擦係数が劇的に増加するまで最大2,860Nを保持する。この試験のための基本的な幾何学的配置を図1に示す。LFW-1は、コーティングの破損まで行われるので、性能は、破損(すなわち、CoFの劇的な増加によって示される)までの最大荷重下でのサイクルの数によって報告される。
Hitachi HPC-9300D:日立化成株式会社から購入される市販のポリアミドイミド樹脂(PAI樹脂)。DMI(1,3-ジメチル-2イミダゾリジノン)溶媒中の20%の非揮発性物質含有量で供給される。
Hitachi HPC-5000E-37:市販のポリアミドイミド樹脂。NEP(N-エチル-2-ピロリドン)溶媒中の36%の非揮発性物質含有量で供給される。
SCP5000樹脂:ポリイミド樹脂(不溶性ポリマー);Vespel(登録商標)でDu Pontによって供給される、引張PSI 24230、伸び7%。
黒鉛CSSP:約1ミクロンの平均粒径で日本黒鉛工業から購入される黒鉛。
黒鉛UF-2:AMG Graphiteから購入される黒鉛、平均粒径1.8ミクロン。
MoS2:Climax Molybdenumから購入される。工業細粒度銘柄は、6ミクロンの中央粒径を有した。工業銘柄は、約30ミクロンの中央粒径を有した。
Cefral Lube:セントラル硝子株式会社から購入されるテトラフルオロエチレンオリゴマー。分子量は、1,500~20,000ダルトンであった。
標準減摩コーティング組成物及びAFC。
下の表中の減摩コーティング組成物(実施例2及び4)は、固体潤滑剤及び不溶性ポリマー成分を可溶性ポリマー樹脂の溶液に添加することによって調製した。この混合物を、次いで、およそ2mmスチール媒体を使って10~20分間Gyromixerで粉砕し、濾過して媒体を除去した。最終調合物を、次いで、好適な粘度に希釈し、膜を試験部品上へ吹き付けた。膜を吹き付けた後、部品を、約15ミクロンの標的膜厚さを目指して80℃で10分間、次いで180~230℃で1時間加熱した。
2つの液体AFC組成物(実施例2及び実施例4)並びに液体AFC組成物から形成された乾燥膜の組成を次の表に示す。個々の材料の量を、具体的な実施例に記載されるように変えた。乾燥膜中の不溶性樹脂と可溶性ポリマーとの総量(すなわち、合計)が同じものにとどまる、及び顔料(すなわち、固体潤滑剤)対バインダー(可溶性樹脂及び不溶性ポリマー)比が同じものにとどまるような、その結果試料を性能特性に関して直接比較することができるような重量パーセントで可溶性樹脂及び不溶性ポリマーを添加した。
黒鉛(固体潤滑剤)あり及びなしで可溶性ポリマーと不溶性ポリマーとを含む並びに可溶性樹脂と不溶性ポリマーとの合計を同じものに保つ液体減摩コーティング組成物から形成された膜を、対照調合物(すなわち、不溶性ポリマーを含有しない)と共に摩擦係数に関して試験した。以下のプロットにおいて、摩擦係数を、実施例2の処方変化についての標準ボールオンプレート摩耗試験(上で記載された)に関して試験時間の関数として様々なコーティングについて示す。変化をグラフ及び表において書き留める。不溶性ポリマーを持たない(すなわち、バインダーとして100%可溶性ポリマーを有する)比較例(「対照」と表示された及び黒色実線でグラフに描かれた)を試験に含めた。灰色線でプロットされる調合物は、ポリイミド固体の高いローディング(すなわち、乾燥膜中の全バインダーの30%(w/w))を持っており、試験にわたって改善された摩擦係数を与え、所望のプラトーを示す。点線及び破線で表される試料は、摩擦係数に関して更にもっと改善され、全体黒鉛用量を一定に保ちながら混合ポリイミド-黒鉛組成物の一部としてポリイミドを添加することによって調製された。すなわち、混合ポリイミド-黒鉛組成物とは別に組み合わせられる任意の追加の黒鉛は、一定の顔料:バインダー比を保つためにポリイミドと一緒に添加される黒鉛の量により減少した。実施例は、不溶性ポリマーの添加が、摩擦係数を下げることを実証している。
実施例4及び実施例5調合物をベースとする第2の減摩コーティング調合物を、不溶性PIポリマー及びPI/黒鉛又はPI/MoS2固体を使って調製し、ブロックオンリング試験(上に記載された)で上記の比較例2と比較した。下の表で理解することができるように、追加の固体試料入り試料が耐えたサイクルの数は、ほとんど全て、対照よりも著しく良好であった。特に、PI/黒鉛及びPI/MoS2固体入り調合物は、サイクルの最も劇的な増加を与えた。
Claims (12)
- 減摩コーティング処方組成物であって、
(e)可溶性樹脂と、
(f)不溶性ポリマーと、
(g)任意選択的に固体潤滑剤と、
(h)溶媒と
を含む、減摩コーティング処方組成物。 - 前記不溶性ポリマーは、ポリアミドイミド、ポリアミド、又はポリイミドポリマーである、請求項1に記載の減摩コーティング処方組成物。
- 前記不溶性ポリマーはポリイミドポリマーである、請求項2に記載の減摩コーティング処方組成物。
- 前記減摩コーティング組成物は前記固体潤滑剤を含み、及び前記固体潤滑剤は、黒鉛、ポリテトラフルオロエチレン、ポリエチレン、又はモリブデン及びコバルトを含む金属硫化物の1つ以上を含む、請求項1に記載の減摩コーティング処方組成物。
- 前記可溶性樹脂は、ポリアミドイミド、ポリイミド、ポリアミド、エポキシ樹脂、フェノール樹脂、ポリベンズイミダゾール、ポリフェニルスルホネート、ポリエーテルエーテルケトン、ポリウレタン、ポリ-ブチルチタネート、ポリアクリル-アルキド樹脂、ポリエーテルケトンケトン、ポリオキシメチレン、ポリブチレンテレフタレート、又はフルオロポリマーから選択される、請求項1~4のいずれか一項に記載の減摩コーティング処方組成物。
- 前記可溶性樹脂は、アミド対イミドの比が100:0~10:90である、ポリアミドイミドである、請求項1~5のいずれか一項に記載の減摩コーティング処方組成物。
- 前記減摩コーティング処方組成物は、前記減摩コーティング処方組成物中の前記可溶性樹脂及び不溶性ポリマーの重量を基準として、10~30%(w/w)の前記可溶性樹脂と、前記減摩コーティング調合物中の可溶性樹脂及び不溶性ポリマーの前記重量を基準として、5~90%(w/w)の不溶性樹脂とを含む、請求項1~6のいずれか一項に記載の減摩コーティング処方組成物。
- 減摩コーティングを備えた部品を形成する方法であって、請求項1に記載の減摩コーティングを前記部品に塗布する工程を含む方法。
- 請求項1に記載の減摩コーティング調合物から形成される減摩コーティングを含む、部品。
- 前記コーティングは、5~50ミクロンの厚さを有する、請求項9又は10に記載の部品。
- 前記部品は摺動部材である、請求項8~10のいずれか一項に記載の部品。
- 前記摺動部材は、コンプレッサの斜板、エンジンタペット、カムシャフト、クランクシャフト、エンジンメタル、エンジンピストン、ピストンリング、ギヤ、ドアロック、ブレーキシム又はブレーキクリップである、請求項11に記載の部品。
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