JP2013170216A - 潤滑油組成物 - Google Patents
潤滑油組成物 Download PDFInfo
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Abstract
【解決手段】100℃における動粘度が1〜5mm2/sである潤滑油基油と、(A)重量平均分子量(Mw)が40万以下でPSSIが20以下の粘度指数向上剤と、(B)金属比3.4以下の過塩基性金属系清浄剤と、(C)摩擦調整剤とを含有し、150℃におけるHTHS粘度が2.6mPa・s未満であることを特徴とする潤滑油組成物。
【選択図】なし
Description
例えば、一般的な省燃費化の手法として、潤滑油の動粘度の低減および粘度指数の向上(低粘度基油と粘度指数向上剤の組合せによるマルチグレード化)や摩擦低減剤の配合が知られている。低粘度化の場合、潤滑油またはそれを構成する基油の粘度の低減に起因して、厳しい潤滑条件下(高温高せん断条件下)での潤滑性能が低下し、摩耗や焼付き、疲労破壊等の不具合の発生が懸念される。また、摩擦低減剤の配合については、無灰系やモリブデン系の摩擦調整剤が知られているが、一般的なこれら摩擦低減剤配合油をさらに上回る省燃費油が求められている。
しかしながら、近年のエンジン技術の進歩により、エンジンの耐久性を維持しながら150℃におけるHTHS粘度を低減することが可能となった。更なる省燃費性の向上のため、例えばSAE 0W−20エンジン油の150℃におけるHTHS粘度の下限である2.6mPa・sを下回るエンジン油が開発、適用されている。しかしながら、150℃におけるHTHS粘度が2.6mPa・sを下回るエンジン油は、一部のエンジンや部品において金属同士が接触する境界潤滑領域の摩擦係数を上昇させ、逆に省燃費性を悪化させることが確認されている。
150℃におけるHTHS粘度が2.6mPa・sを下回るエンジン油を適用した全てのエンジンの省燃費性を向上するためには、境界潤滑領域の摩擦係数をこれまで以上に低減する技術が必要である。
(1)パラフィン基系原油および/または混合基系原油の常圧蒸留による留出油
(2)パラフィン基系原油および/または混合基系原油の常圧蒸留残渣油の減圧蒸留による留出油(WVGO)
(3)潤滑油脱ろう工程により得られるワックス(スラックワックス等)および/またはガストゥリキッド(GTL)プロセス等により得られる合成ワックス(フィッシャートロプシュワックス、GTLワックス等)
(4)基油(1)〜(3)から選ばれる1種または2種以上の混合油および/または当該混合油のマイルドハイドロクラッキング処理油
(5)基油(1)〜(4)から選ばれる2種以上の混合油
(6)基油(1)、(2)、(3)、(4)または(5)の脱れき油(DAO)
(7)基油(6)のマイルドハイドロクラッキング処理油(MHC)
(8)基油(1)〜(7)から選ばれる2種以上の混合油。
(9)上記基油(1)〜(8)から選ばれる基油または当該基油から回収された潤滑油留分を水素化分解し、その生成物またはその生成物から蒸留等により回収される潤滑油留分について溶剤脱ろうや接触脱ろうなどの脱ろう処理を行い、または当該脱ろう処理をした後に蒸留することによって得られる水素化分解基油
(10)上記基油(1)〜(8)から選ばれる基油または当該基油から回収された潤滑油留分を水素化異性化し、その生成物またはその生成物から蒸留等により回収される潤滑油留分について溶剤脱ろうや接触脱ろうなどの脱ろう処理を行い、または、当該脱ろう処理をしたあとに蒸留することによって得られる水素化異性化基油。
なお、本発明でいう15℃における密度とは、JIS K 2249−1995に準拠して15℃において測定された密度を意味する。
また、飽和分の分離方法、あるいは環状飽和分、非環状飽和分等の組成分析の際には、同様の結果が得られる類似の方法を使用することができる。例えば、上記の他、ASTM
D 2425−93に記載の方法、ASTM D 2549−91に記載の方法、高速液体クロマトグラフィ(HPLC)による方法、あるいはこれらの方法を改良した方法等を挙げることができる。
また、本発明に係る潤滑油基油と併用される他の合成系基油としては、100℃における動粘度が1〜5mm2/sの範囲外である、前記した合成系基油が挙げられる。
金属比は3.2以下であることが好ましく、より好ましくは3.0以下、さらに好ましくは2.8以下、特に好ましくは2.6以下、最も好ましくは2.5以下に調整されてなる金属系清浄剤である。金属比が3.4を超えると摩擦トルクの低減すなわち省燃費性が不十分となる。
また金属比は1.0以上であることが好ましく、より好ましくは1.1以上、さらに好ましくは1.5以上、特に好ましくは1.9以上に、最も好ましくは2.2以上に調整されてなる金属系清浄剤である。金属比が1.0未満では内熱機関用潤滑油組成物の動粘度や低温粘度が高くなるため潤滑性や始動性に不具合が生じる可能性があるためである。
より高い摩擦低減効果を得るためには、単独で合成されたものを用いることが好ましい。
実施例1〜5および比較例1〜4においては、それぞれ以下に示す基油および添加剤を用いて表2に示す組成を有する潤滑油組成物を調製した。基油O−1、O−2、O−3の性状を表1に示す。
(基油)
O−1(基油1):n−パラフィン含有油を水素化分解/水素化異性化した鉱油
O−2(基油2):水素化分解鉱油
O−3(基油3):水素化分解鉱油
(添加剤)
A−1:非分散型PMA系粘度指数向上剤(Mw=36万,PSSI=15,Mw/PSSI=2.4×104)
A−2:非分散型PMA系粘度指数向上剤(Mw=33万,PSSI=15,Mw/PSSI=2.2×104)
a−1:非分散型PMA系粘度指数向上剤(Mw=38万,PSSI=27,Mw/PSSI=1.4×104)
a−2:分散型PMA系粘度指数向上剤(Mw=40万,PSSI=45,Mw/PSSI=0.88×104)
B−1:過塩基性ホウ酸カルシウムサリシレートA(金属比2.0、塩基価139mgKOH/g,Ca含有量4.9mass%、B含有量1.3mass%、Ca/B比3.8、アルキル基鎖長14〜18)
B−2:過塩基性ホウ酸カルシウムサリシレートB(金属比2.5、塩基価158mgKOH/g,Ca含有量5.6mass%、B含有量1.7mass%、Ca/B比3.3、アルキル基鎖長14〜18)
b−1:過塩基性ホウ酸カルシウムサリシレートC(金属比3.5、塩基価192mgKOH/g,Ca含有量6.8mass%、B含有量2.7mass%、Ca/B比2.5、アルキル基鎖長14〜18)
C−1:MoDTC(アルキル基鎖長C8/C13、Mo含有量10mass%、硫黄量11mass%)
d−1:コハク酸イミド系分散剤(Mw13000、アルキル基鎖長1900、窒素量0.6mass%)
e−1:ZnDTP(アルキル基鎖長C4/C6、二級、Zn量7.8mass%、P量7.2mass%、S量15.0mass%)
f−1:その他添加剤(酸化防止剤、摩耗防止剤、流動点降下剤、消泡剤等)
実施例1〜5および比較例1〜4の各潤滑油組成物について、40℃または100℃における動粘度、粘度指数、100℃または150℃におけるHTHS粘度を測定した。また、省燃費性の測定は動弁系モータリング摩擦トルクを測定した。各物性値、省燃費性の測定は以下の評価方法により行った。得られた結果を表2に示す。
(1)動粘度:ASTM D−445
(2)粘度指数:JIS K 2283−1993
(3)HTHS粘度:ASTM D−4683
(4)動弁系モータリング摩擦試験:直打型4気筒エンジンの動弁系のカムおよびタペット一対の摩擦トルクを測定可能とする装置を用い、油温100℃、回転数350rpmにおける摩擦トルクを測定した。比較例1を基準油としたときのモータリングフリクション改善率を算出した。
Claims (4)
- 100℃における動粘度が1〜5mm2/sである潤滑油基油と、(A)重量平均分子量(Mw)が40万以下でPSSIが20以下の粘度指数向上剤と、(B)金属比3.4以下の過塩基性金属系清浄剤と、(C)摩擦調整剤とを含有し、150℃におけるHTHS粘度が2.6mPa・s未満であることを特徴とする潤滑油組成物。
- 前記粘度指数向上剤が、重量平均分子量とPSSIの比(Mw/PSSI)が1×104以上である粘度指数向上剤であることを特徴とする、請求項1に記載の潤滑油組成物。
- 前記過塩基性金属系清浄剤が、アルカリ土類金属サリシレートをアルカリ土類金属ホウ酸塩で過塩基化した過塩基性アルカリ土類金属サリシレートであることを特徴とする、請求項1または2に記載の潤滑油組成物。
- 前記摩擦調整剤が、有機モリブデン系摩擦調整剤であることを特徴とする、請求項1〜3のいずれか1項に記載の潤滑油組成物。
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JP2004083746A (ja) * | 2002-08-27 | 2004-03-18 | Nippon Oil Corp | 内燃機関用潤滑油組成物 |
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JP2015189945A (ja) * | 2014-03-28 | 2015-11-02 | Jx日鉱日石エネルギー株式会社 | トランクピストン型ディーゼル機関用潤滑油組成物 |
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