JP2006077246A5

JP2006077246A5 -

Info

Publication number: JP2006077246A5
Application number: JP2005259632A
Authority: JP
Filing date: 2005-09-07
Publication date: 2008-10-23
Anticipated expiration: 2025-09-07

Description

（金属清浄剤）
本発明は、150〜約450のＴＢＮを有する過塩基性金属含有潤滑油分散剤が存在することを必要としている。そのような金属清浄剤は、油の硫酸化灰分が0.80 wt％以下にとどまっている限りは、正常な付帯機能を提供するような量で存在することができ、一般的には、0.5〜3 wt％の量で用いられる。
金属含有清浄剤又は灰形成清浄剤は、沈着物を減少させる又は除去する清浄剤と、酸中和剤又は錆止め剤としての両方に機能し、よって摩耗及び腐食を減少させ、エンジン寿命を延長させる。清浄剤は、一般的には、長い疎水性の尾を有する極性の頭部を含み、その極性の頭部は酸性有機化合物の金属塩を含んでいる。そのような塩は、実質的に化学量論的な量の金属を含有することができ、通常は正塩又は中性塩として記載され、典型的には、ＡＳＴＭＤ-2896によって測定される場合に0〜80の全塩基価(ＴＢＮ)を有し得る。過剰量の金属化合物（例えば、酸化物又は水酸化物など）を、二酸化炭素のような酸性ガスと反応させることによって多量の金属塩基を含めることが可能である。得られた過塩基性清浄剤は、金属塩基（例えばカーボネート）ミセルの外層として、中和された清浄剤を含む。そのような過塩基性清浄剤は、150又はそれ以上のＴＢＮを有することができ、典型的に使用される過塩基性清浄剤は、250〜450又はそれ以上のＴＢＮを有する。
通常用いられている清浄剤としては、金属、特に、例えば、バリウム、ナトリウム、カリウム、リチウム、カルシウム及びマグネシウムといったアルカリ金属類又はアルカリ土類金属類の油溶性であり中性及び過塩基性のスルホネート類、フェナート類、硫化フェナート類、チオホスホネート類、サリチレート類及びナフテナート類並びに他の油溶性カルボキシレート類が挙げられる。最も一般的に使用される金属は、カルシウム及びマグネシウム（その両方は、潤滑剤で使用される清浄剤中に存在していてもよい）、並びにナトリウムとカルシウム及び/又はマグネシウムとの混合物である。過塩基性清浄剤若しくは中性清浄剤の組合せであっても、又はその両方の清浄剤の組合せであっても、使用することができる。 (Metal detergent)
The present invention requires the presence of an overbased metal-containing lubricating oil dispersant having a TBN of 150 to about 450. Such metal detergents can be present in an amount that provides normal incidental function, as long as the sulfated ash content of the oil remains below 0.80 wt%, generally 0.5-3 Used in an amount of wt%.
Metal-containing detergents or ash-forming detergents function both as detergents that reduce or remove deposits and as acid neutralizers or rust inhibitors, thus reducing wear and corrosion and extending engine life. . The detergent generally includes a polar head with a long hydrophobic tail, which polar metal contains a metal salt of an acidic organic compound. Such salts can contain a substantially stoichiometric amount of metal and are usually described as normal or neutral salts, typically as measured by ASTM D-2896. Can have a total base number (TBN) of 0-80. It is possible to include a large amount of metal base by reacting an excess amount of a metal compound (such as an oxide or hydroxide) with an acidic gas such as carbon dioxide. The resulting overbased detergent comprises a neutralized detergent as the outer layer of a metal base (eg carbonate) micelle. Such overbased detergents can have a TBN of 150 or more, and typically used overbased detergents have a TBN of 250 to 450 or more.
Commonly used detergents include oil-soluble, neutral and overbased sulfonates of metals, especially alkali metals or alkaline earth metals such as barium, sodium, potassium, lithium, calcium and magnesium. , Phenates, sulfurized phenates, thiophosphonates, salicylates and naphthenates and other oil-soluble carboxylates. The most commonly used metals are calcium and magnesium (both may be present in the detergent used in the lubricant) and mixtures of sodium and calcium and / or magnesium. Either an overbased detergent or a combination of neutral detergents or a combination of both detergents can be used.

Claims

Crankcase lubricating oil composition having a sulfur content of 0.3 wt% or less, a phosphorus content of 0.08 wt% or less, a sulfated ash content of 0.80 wt% or less, and comprising a mixture of the following (a) to (c) :
(a) a large amount of oil of lubricating viscosity;
(b) at least one nitrogen-containing dispersant providing the oil with a nitrogen content of at least 0.075 wt% and having a polyalkenyl backbone of molecular weight of about 900-3000;
(c) An oil-soluble or oil-dispersible boron source present in an amount to provide the lubricating oil composition in a ratio of about 3: 1 to 5: 1 nitrogen wt%: boron wt%.

The composition further comprises one or more selected from the group consisting of overbased metal-containing detergents, antioxidants, zinc dihydrocarbyl dithiophosphates, oil-soluble organic molybdenum compounds, friction modifiers and viscosity modifiers. The composition as described.

The composition of claim 2, wherein the detergent is a calcium alkylsalicylate having a TBN of 200 to 400.

The composition according to any one of claims 1 to 3, wherein the dispersant is polyisobutenyl succinimide.

The composition according to any one of claims 1 to 4, wherein the boron compound is a boric acid polyisobutenyl succinimide dispersant added separately.

(i) the alkyl is a C ₄ -C ₂₀ alkyl, dialkyl diphenylamine; or (ii) a hindered phenol; containing a is an antioxidant composition according to any one of claims 2-5.

The composition according to any one of claims 2 to 6, wherein the hydrocarbyl group of zinc dihydrocarbyl dithiophosphate has 2 to 8 carbon atoms.

The composition according to any one of claims 2 to 7, wherein the organomolybdenum compound is a dialkyldithiocarbamate.

The composition according to any one of claims 1 to 8, wherein the oil of lubricating viscosity is a mineral oil.