JP5551861B2 - 内燃機関用潤滑油組成物 - Google Patents
内燃機関用潤滑油組成物 Download PDFInfo
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- JP5551861B2 JP5551861B2 JP2008261078A JP2008261078A JP5551861B2 JP 5551861 B2 JP5551861 B2 JP 5551861B2 JP 2008261078 A JP2008261078 A JP 2008261078A JP 2008261078 A JP2008261078 A JP 2008261078A JP 5551861 B2 JP5551861 B2 JP 5551861B2
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- KHYKFSXXGRUKRE-UHFFFAOYSA-J molybdenum(4+) tetracarbamodithioate Chemical compound C(N)([S-])=S.[Mo+4].C(N)([S-])=S.C(N)([S-])=S.C(N)([S-])=S KHYKFSXXGRUKRE-UHFFFAOYSA-J 0.000 description 4
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- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 2
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- 150000003254 radicals Chemical class 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- JJJPTTANZGDADF-UHFFFAOYSA-N thiadiazole-4-thiol Chemical class SC1=CSN=N1 JJJPTTANZGDADF-UHFFFAOYSA-N 0.000 description 1
- 150000004867 thiadiazoles Chemical class 0.000 description 1
- 150000003580 thiophosphoric acid esters Chemical class 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- MBBWTVUFIXOUBE-UHFFFAOYSA-L zinc;dicarbamodithioate Chemical compound [Zn+2].NC([S-])=S.NC([S-])=S MBBWTVUFIXOUBE-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Lubricants (AREA)
Description
ノルマルパラフィンを含有する原料油について、水素化処理触媒を用いて水素化処理する第1工程と、
第1工程により得られる被処理物について、水素化脱ロウ触媒を用いて水素化脱ロウする第2工程と、
第2工程により得られる被処理物について、水素化精製触媒を用いて水素化精製する第3工程と
を備える。
(ガスクロマトグラフィー条件)
カラム:液相無極性カラム(長さ25m、内径0.3mmφ、液相膜厚さ0.1μm)
昇温条件:50℃〜400℃(昇温速度:10℃/min)
キャリアガス:ヘリウム(線速度:40cm/min)
スプリット比:90/1
試料注入量:0.5μL(二硫化炭素で20倍に希釈した試料の注入量)
また、潤滑油基油中のイソパラフィンの割合とは、前記飽和分に占める非環状飽和分と前記飽和分に占めるノルマルパラフィンとの差を、潤滑油基油全量を基準として換算した値を意味する。
(I)100℃における動粘度が1.5mm2/s以上3.5mm2/s未満、より好ましくは2.0〜3.0mm2/sの潤滑油基油
(II)100℃における動粘度が3.0mm2/s以上4.5mm2/s未満、より好ましくは3.5〜4.1mm2/sの潤滑油基油
(III)100℃における動粘度が4.5〜20mm2/s、より好ましくは4.8〜11mm2/s、特に好ましくは5.5〜8.0mm2/sの潤滑油基油。
(IV)40℃における動粘度が6.0mm2/s以上12mm2/s未満、より好ましくは8.0〜12mm2/sの潤滑油基油
(V)40℃における動粘度が12mm2/s以上28mm2/s未満、より好ましくは13〜19mm2/sの潤滑油基油
(VI)40℃における動粘度が28〜50mm2/s、より好ましくは29〜45mm2/s、特に好ましくは30〜40mm2/sの潤滑油基油。
ρ=0.0025×kv100+0.816 (1)
[式中、kv100は潤滑油基油の100℃における動粘度(mm2/s)を示す。]
なお、ρ15>ρとなる場合、粘度−温度特性及び熱・酸化安定性、更には揮発防止性及び低温粘度特性が低下する傾向にあり、また、潤滑油基油に添加剤が配合された場合に当該添加剤の効き目が低下する傾向にある。
A=4.3×kv100+100 (2)
[式中、kv100は潤滑油基油の100℃における動粘度(mm2/s)を示す。]
なお、AP<Aとなる場合、粘度−温度特性及び熱・酸化安定性、更には揮発防止性及び低温粘度特性が低下する傾向にあり、また、潤滑油基油に添加剤が配合された場合に当該添加剤の効き目が低下する傾向にある。
式(1)で示す構造単位中のR2は、上述の通り炭素数1〜50の直鎖状又は分枝状の炭化水素基であり、好ましくは炭素数1〜30の直鎖状又は分枝状の炭化水素であり、さらに好ましくは炭素数1〜20の直鎖状又は分枝状の炭化水素であり、より好ましくは炭素数1〜15直鎖状炭化水素基である。
モノマー(M−1)の好ましい例としては、炭素数1〜30の直鎖又は分岐アルキル基、好ましくは炭素数1〜20の直鎖アルキル基を有するアルキル(メタ)アクリレートが挙げられ、具体的には、メチル(メタ)アクリレート、エチル(メタ)アクリレート、プロピル(メタ)アクリレート、ブチル(メタ)アクリレート、ペンチル(メタ)アクリレート、ヘキシル(メタ)アクリレート、ヘプチル(メタ)アクリレート、オクチル(メタ)アクリレート、ノニル(メタ)アクリレート、デシル(メタ)アクリレート、ウンデシル(メタ)アクリレート、ドデシル(メタ)アクリレート、トリデシル(メタ)アクリレート、テトラデシル(メタ)アクリレート、ペンタデシル(メタ)アクリレート、ヘキサデシル(メタ)アクリレート、ヘプタデシル(メタ)アクリレート、オクタデシル(メタ)アクリレート等(これらアルキル基は直鎖アルキル基が好ましい)が挙げられ、特にメチルメタアクリレート、ドデシルメタアクリレート、トリデシルメタアクリレート、テトラデシルメタアクリレート、ペンタデシルメタアクリレートを含むモノマーであることが好ましく、メチルメタアクリレート、n−ドデシルメタアクリレート、n−トリデシルメタアクリレート、n−テトラデシルメタアクリレート、n−ペンタデシルメタアクリレートを主構成単位とするモノマーであることが特に好ましい。
R6で表される炭素数1〜18のアルキレン基としては、具体的には、エチレン基、プロピレン基、ブチレン基、ペンチレン基、ヘキシレン基、へプチレン基、オクチレン基、ノニレン基、デシレン基、ウンデシレン基、ドデシレン基、トリデシレン基、テトラデシレン基、ペンタデシレン基、ヘキサデシレン基、ヘプタデシレン基、及びオクタデシレン基(これらアルキレン基は直鎖状でも分枝状でもよい。)等が例示できる。
E2で表される基としては、具体的には、ジメチルアミノ基、ジエチルアミノ基、ジプロピルアミノ基、ジブチルアミノ基、アニリノ基、トルイジノ基、キシリジノ基、アセチルアミノ基、ベンゾイルアミノ基、モルホリノ基、ピロリル基、ピロリノ基、ピリジル基、メチルピリジル基、ピロリジニル基、ピペリジニル基、キノニル基、ピロリドニル基、ピロリドノ基、イミダゾリノ基、及びピラジノ基等が例示できる。
まず、溶剤精製基油を精製する工程において減圧蒸留で分離した留分を、フルフラールで溶剤抽出した後で水素化処理し、次いで、メチルエチルケトン−トルエン混合溶剤で溶剤脱ろうした。溶剤脱ろうの際に除去され、スラックワックスとして得られたワックス分(以下、「WAX1」という。)を、潤滑油基油の原料油として用いた。WAX1の性状を表1に示す。
[基油2の製造]
まず、パラフィン含量が95質量%であり、20から80までの炭素数分布を有するFTワックス(以下、「WAX2」という。)を用意した。WAX2の性状を表2に示す。
[基油3の製造]
基油3の製造においては、WAX1をさらに脱油して得られたワックス分(以下、「WAX3」という。)を、潤滑油基油の原料として用いた。WAX3の性状を表3に示す。
[基油4の製造]
水素化脱ろう温度を300℃以上315℃未満に変更した以外は基油2と同様にして、表5に示す組成及び性状を有する潤滑油基油を製造した。
[基油5]
従来の潤滑油基油として、表5に示す組成及び性状を有する潤滑油基油を用意した。
実施例1〜3及び比較例1〜4においては、それぞれ表4、5に示す潤滑油基油及び以下に示す添加剤を用いて表6、7に示す組成を有する潤滑油組成物(0W−20油)を調製した。
(添加剤)
A1:アルキルジフェニルアミン
B1:ジアルキルジチオリン酸亜鉛(リン含有量:7.2質量%、アルキル基:第2級ブチル基又は第2級ヘキシル基の混合物)
C1:Caスルホネート
D1:ポリブテニルコハク酸イミド(ビスタイプ、重量平均分子量:8,500、窒素含有量:0.65質量%)
E1:ポリメタアクリレート系粘度指数向上剤(重量平均分子量MW:300,000、PSSI=40のポリメタクリレート(アルキルメタアクリレート混合物(アルキル基:炭素数1及び12〜15の直鎖アルキル基)及びジメチルアミノエチルメタクリレートを主構成単位とする分散型ポリメタアクリレート)
F1:ポリメタアクリレート系粘度指数向上剤(重量平均分子量MW:100,000、PSSI=5のポリメタクリレート(アルキルメタアクリレート混合物(アルキル基:炭素数1及び12〜15の直鎖アルキル基)及びジメチルアミノエチルメタクリレートを主構成単位とする分散型ポリメタアクリレート)
F2:ポリメタアクリレート系粘度指数向上剤(重量平均分子量MW:500,000、PSSI=30のポリメタアクリレート(アルキルメタアクリレート混合物(アルキル基:炭素数1及び12〜15の直鎖アルキル基)及びジメチルアミノエチルメタクリレートを主構成単位とする分散型ポリメタアクリレート)
F3:エチレン−プロピレン共重合体(重量平均分子量:175,000、アフトン社製Hitec−5751(登録商標))
F4:スチレン−プロピレン共重合体(分子量:150,000,スチレン/水素化イソプレン線状ジブロックコポリマー、Infineum SV151(登録商標))
実施例1〜3及び比較例1〜10の潤滑油組成物の各種性状を表6、7に示す。ここで、表6、7中の「焼付荷重」は、Falex P/V試験機を使用し、500lbfにて5分間なじみ運転を行った後、ラチェットにて荷重を増加させることにより測定した焼付荷重を意味する。また、表6、7中の「摩耗量」は、Falex P/V試験機を使用した摩擦試験において測定された、1000lbfにて30分間運転前後のピンとブロックの合計の重量減を意味する。
Claims (3)
- 尿素アダクト値が4質量%以下であり且つ粘度指数が100以上である潤滑油基油と、
重量平均分子量が200,000〜400,000のポリ(メタ)アクリレートと、を含有することを特徴とする内燃機関用潤滑油組成物。 - 前記潤滑油基油が、ノルマルパラフィンを含有する原料油について、得られる被処理物の尿素アダクト値が4質量%以下であり且つ粘度指数が100以上となるように、
水素化処理触媒を用いて水素化処理する第1工程と、
第1工程により得られる被処理物について、水素化脱ロウ触媒を用いて水素化脱ロウする第2工程と、
第2工程により得られる被処理物について、水素化精製触媒を用いて水素化精製する第3工程と、
を備える水素化分解/水素化異性化を行う工程により得られた潤滑油基油であり、
前記ノルマルパラフィンを含有する原料油は、原料油全量を基準として、スラックワックス及び/又はフィッシャートロプシュ・ワックスを50質量%以上100質量%以下で含有する、
ことを特徴とする、請求項1に記載の内燃機関用潤滑油組成物。 - 前記原料油が潤滑油基油の溶剤脱ろうによって得られるスラックワックスを50質量%以上含有することを特徴とする、請求項2に記載の内燃機関用潤滑油組成物。
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