JP6681252B2 - 潤滑油基油、潤滑油組成物及び潤滑油組成物の消費量抑制方法 - Google Patents
潤滑油基油、潤滑油組成物及び潤滑油組成物の消費量抑制方法 Download PDFInfo
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- JP6681252B2 JP6681252B2 JP2016076699A JP2016076699A JP6681252B2 JP 6681252 B2 JP6681252 B2 JP 6681252B2 JP 2016076699 A JP2016076699 A JP 2016076699A JP 2016076699 A JP2016076699 A JP 2016076699A JP 6681252 B2 JP6681252 B2 JP 6681252B2
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Description
[2]前記第1のエステル系基油及び前記第2のエステル系基油の総量が、潤滑油基油全量基準で、50質量%を超える、[1]に記載の潤滑油基油。
[3][1]又は[2]に記載の潤滑油基油と、酸化防止剤、摩耗防止剤、金属系清浄剤、無灰分散剤、摩擦調整剤、粘度指数向上剤、及び流動点降下剤からなる群より選ばれる少なくとも1種と、を含有する、潤滑油組成物。
[4]内燃機関に用いられる、[3]に記載の潤滑油組成物。
[5]前記内燃機関がハイブリッド機構を有する、[4]に記載の潤滑油組成物。
[6][3]〜[5]のいずれかに記載の潤滑油組成物を用いて潤滑を行う、潤滑油組成物の消費量抑制方法。
第1のエステル系基油は、NOACK蒸発量が15.0質量%以上のエステル系基油であれば、特に制限されない。第1のエステル系基油を構成するアルコールは、1価アルコールであってもよく、多価アルコールであってもよい。また、第1のエステル系基油を構成する酸は、一塩基酸であってもよく、多塩基酸であってもよい。また、第1のエステル系基油は、1価アルコールと多価アルコールの混合アルコール及び/又は一塩基酸と多塩基酸との混合酸により構成される複合エステル化合物であってもよい。また、第1のエステル系基油として、NOACK蒸発量が15.0質量%以上のエステル系基油の1種を単独で用いてもよく、2種以上を任意の割合で組み合わせて用いてもよい。
(a)一価アルコールと一塩基酸とのエステル
(b)多価アルコールと一塩基酸とのエステル
(c)一価アルコールと多塩基酸(二塩基酸)とのエステル
(d)多価アルコールと多塩基酸(二塩基酸)とのエステル
(e)一価アルコール及び多価アルコールの混合物と一塩基酸との混合エステル
(f)一価アルコール及び多価アルコールの混合物と多塩基酸(二塩基酸)との混合エステル
(g)多価アルコールと一塩基酸及び多塩基酸の混合物との混合エステル
(h)一価アルコール及び多価アルコールの混合物と一塩基酸及び多塩基酸の混合物との混合エステル
第2のエステル系基油は、NOACK蒸発量が15.0質量%未満のエステル系基油であれば、特に制限されない。第2のエステル系基油を構成するアルコールは、1価アルコールであってもよく、多価アルコールであってもよい。また、このようなエステル系基油を構成する酸は、一塩基酸であってもよく、多塩基酸であってもよい。また、第2のエステル系基油は、1価アルコールと多価アルコールの混合アルコール及び/又は一塩基酸と多塩基酸との混合酸により構成される複合エステル化合物であってもよい。また、第2のエステル系基油として、NOACK蒸発量が15.0質量%未満のエステル系基油の1種を単独で用いてもよく、2種以上を任意の割合で組み合わせて用いてもよい。
潤滑油基油の100℃動粘度は、3.5mm2/s以下、好ましくは3.4mm2/s以下、さらに好ましくは3.3mm2/s以下である。100℃動粘度が3.5mm2/s以下であると、充分な低粘度を示す潤滑油組成物が得られる傾向にある。また、潤滑油基油の100℃動粘度は、特に制限されないが、1.0mm2/s以上、2.0mm2/s以上又は3.0mm2/s以上であってもよい。
本実施形態に係る潤滑油組成物は、上記潤滑油基油と、酸化防止剤、摩耗防止剤、金属系清浄剤、無灰分散剤、摩擦調整剤、粘度指数向上剤、及び流動点降下剤からなる群より選ばれる少なくとも1種と、を含有する。
酸化防止剤としては、例えば、フェノール系、アミン系等の無灰酸化防止剤、銅系、モリブデン系等の金属系酸化防止剤が挙げられる。より具体的には、例えば、フェノール系無灰酸化防止剤としては、4,4’−メチレンビス(2,6−ジ−tert−ブチルフェノール)、4,4’−ビス(2,6−ジ−tert−ブチルフェノール)等が、アミン系無灰酸化防止剤としては、フェニル−α−ナフチルアミン、アルキルフェニル−α−ナフチルアミン、ジアルキルジフェニルアミン、ジフェニルアミン等が挙げられる。潤滑油組成物に酸化防止剤を含有させる場合、これらの中から任意に選ばれる1種類又は2種類以上を含有させることができる。
<第1のエステル系基油>
A−1:ジエステル(イソノニルアルコールとアジピン酸とのジエステル、分子量:398、NOACK蒸発量:19.9質量%、100℃動粘度:3.0mm2/s、40℃動粘度:10.5mm2/s、粘度指数:149)
A−2:ジエステル(2−エチルヘキシルアルコールとアゼライン酸とのジエステル、分子量:412、NOACK蒸発量:19.2質量%、100℃動粘度:3.0mm2/s、40℃動粘度:10.6mm2/s、粘度指数:144)
A−3:ポリオールエステル(ネオペンチルグリコールと炭素数10の一塩基酸とのポリオールエステル、分子量:412、NOACK蒸発量:18.3質量%、100℃動粘度:3.0mm2/s、40℃動粘度:10.5mm2/s、粘度指数:141)
A−4:ジエステル(2−エチルヘキシルアルコールとセバシン酸とのジエステル、分子量:426、NOACK蒸発量:15.4質量%、100℃動粘度:3.2mm2/s、40℃動粘度:11.6mm2/s、粘度指数:152)
<第2のエステル系基油>
B−1:ジエステル(炭素数8の分岐モノアルコールとドデカン二酸とのジエステル、分子量:454、NOACK蒸発量:7.0質量%、100℃動粘度:4.2mm2/s、40℃動粘度:15.9mm2/s、粘度指数:182)
B−2:モノエステル(炭素数20の飽和モノアルコールと炭素数18の飽和一塩基酸とのモノエステル、分子量:564、NOACK蒸発量:4.7質量%、100℃動粘度:5.4mm2/s、40℃動粘度:25.2mm2/s、粘度指数:159)
B−3:ポリオールエステル(トリメチロールプロパンと炭素数8(直鎖)/10(直鎖)の一塩基酸とのポリオールエステル混合物、NOACK蒸発量:4.3質量%、100℃動粘度:4.3mm2/s、40℃動粘度:19.0mm2/s、粘度指数:138)
B−4:モノエステル(炭素数13の分岐モノアルコールとオレイン酸とのモノエステル、分子量:464、NOACK蒸発量:4.1質量%、100℃動粘度:4.0mm2/s、40℃動粘度:14.5mm2/s、粘度指数:184)
<エステル系基油以外の基油>
C−1:鉱油(NOACK蒸発量:39.0質量%、100℃動粘度:3.1mm2/s、40℃動粘度:12.4mm2/s、粘度指数:103)
C−2:鉱油(NOACK蒸発量:13.2質量%、100℃動粘度:4.2mm2/s、40℃動粘度:18.2mm2/s、粘度指数:135)
C−3:鉱油(NOACK蒸発量:7.4質量%、100℃動粘度:6.4mm2/s、40℃動粘度:35.6mm2/s、粘度指数:133)
<添加剤>
D−1:性能添加剤パッケージ(酸化防止剤、摩耗防止剤、金属系清浄剤、無灰分散剤を含む)
D−2:粘度指数向上剤(ポリメタクリレート系粘度指数向上剤、重量平均分子量45万)
JIS K 2283に準拠して測定した。動粘度が小さい(例えば、100℃の動粘度が3.5mm2/s以下)ほど、低粘度に優れることを意味する。
ASTM D 5800(NOACK試験:250℃、1時間)に準拠して測定した。NOACK蒸発量が小さい(例えば、15.0質量%以下)ほど、低蒸発性に優れることを意味する。
ASTM D 4683に準拠し、150℃、せん断速度106/sにおける粘度を測定した。
Claims (5)
- NOACK蒸発量が15.4質量%以上である第1のエステル系基油と、
NOACK蒸発量が15.0質量%未満である第2のエステル系基油と、
を含有し、
100℃動粘度が3.5mm2/s以下であり、NOACK蒸発量が15.0質量%以下であり、
前記第1のエステル系基油及び前記第2のエステル系基油の総量が、潤滑油基油全量基準で、50質量%を超える、潤滑油基油。 - 請求項1に記載の潤滑油基油と、
酸化防止剤、摩耗防止剤、金属系清浄剤、無灰分散剤、摩擦調整剤、粘度指数向上剤、及び流動点降下剤からなる群より選ばれる少なくとも1種と、
を含有する、潤滑油組成物。 - 内燃機関に用いられる、請求項2に記載の潤滑油組成物。
- 前記内燃機関がハイブリッド機構を有する、請求項3に記載の潤滑油組成物。
- 請求項2〜4のいずれか一項に記載の潤滑油組成物を用いて潤滑を行う、潤滑油組成物の消費量抑制方法。
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