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JP2911668B2 - エンジン油組成物 - Google Patents

エンジン油組成物

Info

Publication number
JP2911668B2
JP2911668B2 JP3328772A JP32877291A JP2911668B2 JP 2911668 B2 JP2911668 B2 JP 2911668B2 JP 3328772 A JP3328772 A JP 3328772A JP 32877291 A JP32877291 A JP 32877291A JP 2911668 B2 JP2911668 B2 JP 2911668B2
Authority
JP
Japan
Prior art keywords
weight
molybdenum
engine oil
engine
oil composition
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.)
Expired - Lifetime
Application number
JP3328772A
Other languages
English (en)
Other versions
JPH05163497A (ja
Inventor
芳隆 田本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Idemitsu Kosan Co Ltd
Original Assignee
Idemitsu Kosan Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=18213967&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JP2911668(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Idemitsu Kosan Co Ltd filed Critical Idemitsu Kosan Co Ltd
Priority to JP3328772A priority Critical patent/JP2911668B2/ja
Priority to EP92120534A priority patent/EP0562172B1/en
Priority to DE69228677T priority patent/DE69228677T2/de
Priority to CA002085074A priority patent/CA2085074C/en
Publication of JPH05163497A publication Critical patent/JPH05163497A/ja
Priority to US08/238,788 priority patent/US5458807A/en
Application granted granted Critical
Publication of JP2911668B2 publication Critical patent/JP2911668B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/48—Carboxylic acids; Salts thereof having carboxyl groups bound to a carbon atom of a six-membered aromatic ring
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Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、エンジン油組成物に関
し、詳しくは、エンジンの摩擦損失を低減し、かつ使用
開始初期のみならず、一定期間使用後においても低摩擦
特性を有するエンジン油組成物に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】自動車
用および各種産業用内燃機関の潤滑用エンジン油には、
清浄性が良い，耐摩耗性に優れる，熱・酸化安定
性に優れる，オイル消費が少ない，エンジン摩擦損
失が少ない等の各特性が要求されている。特に、のエ
ンジン摩擦損失が少ない特性は、省エネルギー対策上か
ら又ＣＯ2 等による地球環境の改善の観点から非常に重
要視されている。この目的のために、従来から、例え
ば、ジチオリン酸モリブデンやジチオカルバミン酸モリ
ブデン等の摩擦調整剤をエンジン油に添加する手法が採
られている（特開昭６２−２１５６９７号公報，特公平
３−２３５９５号公報等参照）。しかるに、これらの従
来技術には種々の問題がある。すなわち、 1)摩擦調整剤の添加は、エンジンの摩擦損失低減に対し
ては、効果はあるものの、摩擦調整剤以外のエンジンオ
イル油用添加剤の影響を受けやすく、その添加効果は大
きく変動し、安定性に欠けるおそれがある。 2)摩擦調整剤は、使用開始初期には添加効果が認められ
るが、比較的早い時期に効果が喪失してしまうという問
題がある。
【０００３】そこで、本発明者は、かかる従来の上記課
題を解消し、エンジンの摩擦損失低減効果を長期にわた
って安定的に発現できるエンジン油を開発すべく鋭意研
究を重ねた。その結果、基油に有機モリブデン化合物，
硼素系のコハク酸イミド及びサリチル酸のアルカリ土類
金属塩を配合することによって、上記の目的を達成でき
ることを見出した。本発明は、このような知見に基いて
完成したものである。
【０００４】
【課題を解決するための手段】すなわち、本発明は、
（Ａ）鉱油及び／又は合成油からなる基油，（Ｂ）アル
ケニルコハク酸イミドの硼素化合物誘導体１〜１０重量
％，（Ｃ）サリチル酸のアルカリ土類金属塩１〜１０重
量％及び（Ｄ）ジチオリン酸モリブデン及び／又はジチ
オカルバミン酸モリブデン１００〜２０００ｐｐｍ（モ
リブデン原子換算）を主成分とするエンジン油組成物を
提供するものである。
【０００５】先ず、本発明のエンジン油組成物を構成す
る（Ａ）成分の基油としては、各種の鉱油あるいは合成
油を用いることができる。通常は、１００℃における動
粘度が１〜１００ｃＳｔの鉱油及び／又は合成油からな
る。その鉱油としては、例えば、パラフィン系鉱油，中
間基系鉱油，ナフテン系鉱油等をあげることができる。
また、合成油としては、様々なものがあるが、炭素数２
〜１６のオレフィンの（共）重合物（オリゴマーを含
む），アルキルベンゼン，アルキルナフタレン，各種エ
ステルすなわちネオペンチルグリコール，トリメチロー
ルプロパン，ペンタエリスリトールなどの脂肪酸エステ
ル等を使用することができる。そして、これらの鉱油お
よび合成油は、単独で使用することは勿論、任意の割合
で混合して使用することもできる。
【０００６】一方、本発明のエンジン油組成物を構成す
る（Ｂ）成分のアルケニルコハク酸イミドの硼素化合物
誘導体としては、種々の製法によって造られた様々なも
のがある。例えば、アルキレンアミンと硼素化合物と
の反応生成物にアルキル置換コハク酸無水物を反応させ
た生成物（特公昭４２−８０１３号公報），炭化水素
置換コハク酸無水物と硼素化合物との反応生成物にアル
キレンアミンを反応させた生成物（特公昭４２−８０１
４号公報），アルケニルコハク酸無水物にヒドロキシ
ル化第１級アミント硼素化合物を反応させた生成物（特
開昭５１−５２３８１号公報），芳香族多価カルボン
酸とアルケニルコハク酸とポリアルキレンポリアミンと
を特定のモル比で反応させた生成物に硼素化合物を反応
させた生成物（特開昭５１−１３０４０８号公報），
アミノアルコールと硼酸とオキシエタンカルボン酸との
縮合生成物（特開昭５４−８７７０５号公報），ポリ
アルケニルコハク酸無水物に、ポリアルキレングリコー
ル，第２級アルカノールアミン及び硼素化合物を順次反
応させて得られる生成物などが挙げられる。具体的に
は、ポリブテニル（数平均分子量５００〜５０００）コ
ハク酸イミド硼素化物を挙げることができる。これらの
アルケニルコハク酸イミドの硼素化合物誘導体の配合量
は、通常は組成物全体に対して１〜１０重量％、好まし
くは２〜８重量％である。配合量が１重量％未満では、
本発明の目的とする効果が得られない。また、１０重量
％を超えても、配合量に相当する効果の向上は認められ
ず、これを超えてまで配合する必要はない。
【０００７】また、本発明のエンジン油組成物を構成す
る（Ｃ）成分のサリチル酸のアルカリ土類金属塩は、様
々なものが使用可能である。好ましいものとしては、一
般式（Ｉ）
【０００８】
【化１】
【０００９】（式中、Ｒは水素または炭素数１〜３０の
アルキル基を示し、ｎは１〜４の整数を示し、Ｍはアル
カリ土類金属、特にＣａ，ＢａまたはＭｇを示す。）で
表わされるサリチレート化合物である。これらの中で
は、特にカルシウムサリチレートやマグネシウムサリチ
レートが好適である。これらのサリチル酸のアルカリ土
類金属塩の配合量は、通常は組成物全体に対して１〜１
０重量％、好ましくは２〜６重量％である。配合量が１
重量％未満では、本発明の目的とする効果が得られな
い。また、１０重量％を超えても、配合量に相当する効
果の向上は認められず、これを超えてまで配合する必要
はない。そして、本発明のエンジン油組成物中、（Ｂ）
成分であるアルケニルコハク酸イミドの硼素化合物誘導
体に含まれる硼素と（Ｃ）成分であるサリチル酸のアル
カリ土類金属塩に含まれるアルカリ土類金属との濃度比
（硼素／アルカリ土類金属の原子比）は、好ましくは0.
５〜５０、より好ましくは0.５〜１０である。ここで、
硼素／アルカリ土類金属の原子比が、0.５未満であると
初期の摩擦損失が大きく、５０を超えると劣化後の摩擦
損失が大きいという不都合が生じやすい。
【００１０】さらに、本発明のエンジン油組成物を構成
する（Ｄ）成分は、ジチオリン酸モリブデン（ＭｏＤＴ
Ｐ）及び／又はジチオカルバミン酸モリブデン（ＭｏＤ
ＴＣ）である。この中では、特にジチオカルバミン酸モ
リブデンが好ましい。ここでＭｏＤＴＰとしては、例え
ばジイソプロピルジチオリン酸モリブデン，ジ（２−エ
チルヘキシル）ジチオリン酸モリブデン，ジ（ノニルフ
ェニル）ジチオリン酸モリブデンなどのジアルキル（又
はジアリール）ジチオリン酸モリブデンなどがあり、ま
たＭｏＤＴＣとしては、例えばジブチルジチオカルバミ
ン酸モリブデン，ジ（２−エチルヘキシル）ジチオカル
バミン酸モリブデン，ジラウリルジチオカルバミン酸モ
リブデンなどのジアルキルジチオカルバミン酸モリブデ
ンなどがある。これらのモリブデン化合物の配合量
は、、通常は組成物全体に対して１００〜２０００ｐｐ
ｍ（モリブデン原子換算）、好ましくは２００〜１５０
０ｐｐｍである。配合量が１００ｐｐｍ未満では、本発
明の目的とする効果が得られず、また、２０００ｐｐｍ
を超えると清浄性が悪化することがある。
【００１１】本発明のエンジン油組成物は、基本的には
上記（Ａ），（Ｂ），（Ｃ）及び（Ｄ）の各成分とを主
成分として配合することによって調製されるが、さらに
所望により、各種添加剤を配合することができる。例え
ば、粘度指数向上剤，流動点降下剤，酸化防止剤，清浄
分散剤，耐摩耗剤，防錆剤等のエンジン油性能を付与す
るのに効果的な添加剤を必要に応じて配合することがで
きる。具体的には、粘度指数向上剤として、ポリメタク
リレート，ポリイソブチレン，エチレン−プロピレン共
重合体，スチレン−ジエン水素化共重合体等、流動点降
下剤として、ポリアルキルメタクリレート，フェノール
縮合物，ナフタリン縮合物等、酸化防止剤として、ヒン
ダードフェノール系の酸化防止剤（例えば２，６−ジｔ
ｅｒｔ−ブチルパラクレゾールなど），アミン系酸化防
止剤（例えばα−ナフチルアミン，フェニルナフチルア
ミンなど），リン系酸化防止剤、清浄分散剤として、ス
ルホネート，フィネート等，その他を必要に応じて配合
することもできる。その他の添加剤の中では、好ましい
ものとしてはジアルキルジチオリン酸亜鉛を、そして特
に好ましいものとしてはセカンダリーアルキル型ジアル
キルジチオリン酸亜鉛（そのうち、ジアルキルジチオリ
ン酸亜鉛中の全アルキル基（但し、アリール基等のアル
キル基以外の有機残基を含む）の合計量に対してセカン
ダリーアルキル基が５０重量％以上が好適である）を挙
げることができる。
【００１２】
【実施例】次に、本発明を実施例及び比較例に基いて、
さらに詳しく説明する。各実施例及び比較例における各
成分の配合割合は、第１表に示す通りである。
【００１３】
【表１】
【００１４】
【表２】
【００１５】
【表３】
【００１６】なお、第１表中の注書は、次の通りであ
る。 1)：溶剤精製１００ニュートラル鉱油 2)：ポリブテニルコハク酸イミド硼素化物，硼素＝２重
量％，窒素＝2.１重量％ 3)：ポリブテニルコハク酸イミド硼素化物，硼素＝1.４
重量％，窒素＝1.４重量％ 4)：ポリブテニルコハク酸イミド，窒素＝２重量％ 5)：マンニッヒ塩基，窒素＝1.４重量％ 6)：Ｃａサリチレート，Ｃａ＝６重量％ 7)：Ｃａスルホネート，Ｃａ＝１２重量％ 8)：Ｃａフィネート，Ｃａ＝9.３重量％ 9)：ジ−(2−エチルヘキシル）ジチオカルバミン酸モリ
ブデン，Ｍｏ＝3.５重量％ 10) ：ジ−(2−エチルヘキシル）ジチオリン酸モリブデ
ン，Ｍｏ＝７重量％ 11) ：ポリメタアクリレート，重量平均分子量（Ｍｗ）
＝２０万 12) ：セカンダリーアルキル型ジアルキルジチオリン酸
亜鉛（油中Ｚｎ＝0.１１重量％），フェノール系酸化防
止剤（0.５重量％），消泡剤他
【００１７】実施例１〜４及び比較例１〜６ これらの実施例及び比較例は、次の如く行った。すなわ
ち、排気量１５００ｃｃのＳＯＨＣ(single overhead c
amshaft)エンジンからエンジンヘッド（動弁部分）を取
り出し、カムシャフトをモーターで駆動し、その際にカ
ム軸にかかるトルクを測定した。なお、カム軸の回転数
は、７５０ｒｐｍ，エンジンヘッドへのエンジン油の供
給は、油温８０℃で１リットル／分とした。そして、供
試油としては、新油および排気量２２００ｃｃのエンジ
ンによって高速走行モードで５０時間劣化させた後の劣
化処理油を用いた。性能評価の結果は、第１表に示した
通りである。
【００１８】第１表から、本発明の実施例では、比較例
に比べていずれも優れた結果が得られている。特に、新
油および５０時間劣化処理油との間には、摩擦トルクに
は変化が、全く見られない。
【００１９】
【発明の効果】以上のように、本発明のエンジン油組成
物は、エンジンの摩擦損失を低減し、かつ使用開始初期
のみならず、一定期間使用後においても低摩擦特性を有
するエンジン油組成物である。
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ１０Ｍ 137:10 135:18 Ｃ１０Ｎ 10:04 10:12 30:06 40:25） (58)調査した分野(Int.Cl.6，ＤＢ名) C10M 163/00 C10M 125/26 C10M 133/56 C10M 129/54 C10M 137/10 C10N 135/18 C10N 30:06 C10N 40:25

Claims (3)

    (57)【特許請求の範囲】
  1. 【請求項１】 （Ａ）鉱油及び／又は合成油からなる基
    油，（Ｂ）アルケニルコハク酸イミドの硼素化合物誘導
    体１〜１０重量％，（Ｃ）サリチル酸のアルカリ土類金
    属塩１〜１０重量％及び（Ｄ）ジチオリン酸モリブデン
    及び／又はジチオカルバミン酸モリブデン１００〜２０
    ００ｐｐｍ（モリブデン原子換算）を主成分とするエン
    ジン油組成物。
  2. 【請求項２】 組成物における硼素とアルカリ土類金属
    の濃度比が、0.５〜５０（原子比）である請求項１記載
    のエンジン油組成物。
  3. 【請求項３】 セカンダリーアルキル型ジアルキルジチ
    オリン酸亜鉛を含む請求項１または請求項２記載のエン
    ジン油組成物。
JP3328772A 1991-12-12 1991-12-12 エンジン油組成物 Expired - Lifetime JP2911668B2 (ja)

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JP3328772A JP2911668B2 (ja) 1991-12-12 1991-12-12 エンジン油組成物
EP92120534A EP0562172B1 (en) 1991-12-12 1992-12-02 Engine oil composition
DE69228677T DE69228677T2 (de) 1991-12-12 1992-12-02 Motorölzusammensetzung
CA002085074A CA2085074C (en) 1991-12-12 1992-12-10 Engine oil composition
US08/238,788 US5458807A (en) 1991-12-12 1994-05-06 Engine oil composition

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EP0562172B1 (en) 1999-03-17
DE69228677T2 (de) 1999-07-22
US5458807A (en) 1995-10-17
CA2085074C (en) 2002-05-28
EP0562172A1 (en) 1993-09-29
CA2085074A1 (en) 1993-06-13
JPH05163497A (ja) 1993-06-29

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