JP2011195837A - Lubricating composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improvement of a piston accumulation forming characteristic of a lubricating composition and to provide an alternative lubricating composition.SOLUTION: The lubricating composition contains a base oil selected from the group consisting of a Fischer-Tropsch-derived base oil and a poly-alpha olefin (PAO) base oil or a combination thereof, has a TBN (total base number) value of 3.5 to 70 mg KOH/g as determined according to ASTM D 2896, and has a soap content of 15 to 30 mM.

Description

  The present invention relates to a lubricating composition comprising a base oil, in particular a Fischer-Tropsch derived base oil.

  For example, D. C., shown at 2nd Asia-Pacific base oil Conference, 23-25 October 2007, Beijing, China. J. et al. Fischer-Tropsch origin in lubricating compositions such as engine oils, transmission fluids and industrial lubricants as disclosed in Wedlock et al., “Gas-to-Liquids Base Oils to Assistance in Meeting OEM requirements 2010 and beyond”. The use of a base oil provides various performance benefits. Examples of performance benefits from the use of Fischer-Tropsch derived base oils mentioned in the above paper are improved oxidation characteristics, improved engine cleanliness, improved wear protection, improved emissions, and suitability of aftertreatment equipment. It is an improvement. Fischer-Tropsch base oil also allows formulation of formulations that are low viscosity and save energy.

  EP 2159275 also describes a lubricating composition containing a Fischer-Tropsch derived base oil, especially for improving the antioxidant properties measured by the HPDSC according to ASTM D 6186-08 and / or the ROBO test according to ASTM D 7528-09. The use of is disclosed.

  Moreover, it has been found that Fischer-Tropsch derived base oils show a reduced fuel dilution effect in lubricants when included in crankcase lubricants for crankcase engine operation. During warm-up, when the crankcase is cold, it can act as a condensing agent for the piston blow-by gas containing some unburned fuel. The condensed fuel then dissolves and dilutes the lubricant. Also, if the engine is operated under high load conditions with the associated larger blow-by, the fuel dilution of the lubricant will be greater. Normally, most of the hydrocarbon components of unburned fuel are volatilized at normal operating temperatures. In the case of a gasoline engine, since the platform used as a mixed component in gasoline for improving the octane number of fuel is a heavy aromatic component, it can be permanently isolated from the lubricant. This increases the PCA (polycyclic aromatic compound) content from the platform, thus increasing the toxicity of the used gasoline engine oil. Similarly, in diesel engines where biocomponents (ester-based) can be used in diesel fuel, the ester component derived from non-volatile fuel can be permanently isolated from the lubricant base oil. This can subsequently lead to problems of lubricant gelation and engine damage. Since Fischer-Tropsch derived base oils are essentially pure isoparaffinic base oils with low solubility, they are less prone to absorb polar species such as platforms and esters, It shows a stronger tendency to show a reduced fuel dilution effect in the lubricant by rejecting these components in raising the operating temperature.

  Also, catalytically dewaxed Fischer-Tropsch derived heavy base oils with residual wax turbidity can be obtained without any technical or aesthetic defects in cylinder lubricants (eg, marine SAE 50). It has been found that it can be used. In this regard, “heavy base oil” means a base oil having a kinematic viscosity at 100 ° C. of at least 14 cSt, such as about 15 cSt. A base oil having a residual wax haze may be defined as a base oil having a cloud point of at least 15 ° C. The use of such a high VI base oil in cylinder lubricant applications has the added benefit of being easier to pump out of the lubricant oil tank under low temperature conditions and the total mineral base oil (generally lower VI Compared to similar formulations based on), it results in a thicker oil film under high temperature conditions in the cylinder.

European Patent Application No. 2159275

D. C., shown at 2nd Asia-Pacific base oil Conference, Beijing, China, 23-25 October 2007. J. et al. Wedlock et al., “Gas-to-Liquids Base Oils to Assistance in Meeting OEM requirements 2010 and beyond”

  An object of the present invention is to improve the piston deposit formation characteristics of a lubricating composition.

  Another object of the present invention is to provide an alternative lubricating composition.

  One or more of the above or other objects are obtained by the present invention with a lubricating composition comprising a base oil selected from the group consisting of a Fischer-Tropsch derived base oil and a poly-alphaolefin (PAO) base oil or combinations thereof. And the composition has a TBN (total base number) value of 3.5 to 70 mg KOH / g as measured by ASTM D 2896, and the composition has a soap content of 15 to 30 mM.

  Surprisingly, it has been found that the lubricating composition according to the present invention exhibits improved piston deposit formation properties, particularly when measured according to ASTM D 7097-09.

  Preferably, the composition is greater than 4.0, more preferably greater than 5.5, even more preferably greater than 6.0 mg KOH / g, even more preferably still, as measured by ASTM D 2896. Has a TBN value greater than 0 mg KOH / g. In general, the composition has a TBN value of less than 40, preferably less than 20.0, more preferably less than 15.0, and even more preferably less than 12.0 mg KOH / g.

  There is no particular restriction on the base oil used in the lubricating composition according to the present invention, and in addition to various conventional mineral oils and synthetic oils, naturally derived esters such as vegetable oils are at least Fischer-Tropsch derived base oils and poly -Can be conveniently used in the presence of an alpha olefin (PAO) base oil.

  As the base oil used in the present invention may conveniently comprise a mixture of one or more mineral oils and / or one or more synthetic oils, according to the present invention, the term “base oil” May refer to a mixture containing more base oil than seed. Mineral oils include liquid petroleum and solvent-treated or acid-treated mineral lubricating oils of the paraffin, naphthene or paraffin / naphthene mixed type, which may be further modified by hydrofinishing and / or dewaxing. Can be mentioned.

  Suitable base oils for use in the lubricating oil compositions of the present invention are derived from Group I, Group II, Group III mineral base oils, Group IV poly-alphaolefins (PAO), Group III Fischer-Tropsch Base oils and mixtures thereof.

  The “Group I”, “Group II”, “Group III”, and “Group IV” base oils in the present invention are classified into Group I, II, III, and IV lubricant base oils as defined by the American Petroleum Institute (API). Is meant. These API classifications are defined in API Publication 1509, 15th edition, Appendix E, April 2002.

  Fischer-Tropsch derived base oils are known in the art. By the term “Fischer-Tropsch derived” is meant that the base oil is or is derived from a synthetic product of the Fischer-Tropsch process. A Fischer-Tropsch derived base oil may also be referred to as a GTL (Gas Liquid) base oil. Suitable Fischer-Tropsch derived base oils that can be conveniently used as base oils in the lubricating compositions of the present invention are, for example, EP 0 769 959, EP 0 668 342, WO 97/21788, WO 00/15736, WO 00/14188, WO 00/14187, WO 00/14183. , WO00 / 14179, WO00 / 08115, WO99 / 41332, EP1029029, WO01 / 18156 and WO01 / 57166.

  Synthetic oils include carbonization such as olefin oligomers (including polyalphaolefin base oils, PAO), dibasic acid esters, polyol esters, polyalkylene glycols (PAGs), alkylnaphthalenes and dewaxed waxy isomerates. Hydrogen oil is mentioned. Synthetic hydrocarbon base oils sold under the name “Sell XHVI” by Shell Group may be conveniently used.

Poly-alpha olefin base oils (PAO) and their manufacture are well known in the art. Preferred poly-alpha olefin base oils that can be used in the lubricating compositions of the present invention can be obtained from linear C ₂ to C ₃₂ , preferably C ₆ to C ₁₆ alpha olefins. Particularly preferred feedstocks for the above poly-alpha olefins are 1-octene, 1-decene, 1-dodecene and 1-tetradecene.

  According to the present invention, the base oil used in the lubricating composition according to the present invention comprises at least a base oil selected from the group consisting of a poly-alphaolefin base oil and a Fischer-Tropsch derived base oil or combinations thereof.

  From the viewpoint of high PAO production cost, it is strongly preferred to use Fischer-Tropsch derived base oil over PAO base oil. Thus, preferably the base oil is derived from more than 50% by weight, preferably more than 60% by weight, more preferably more than 70% by weight, even more preferably more than 80% by weight, most preferably more than 90% by weight Fischer-Tropsch Contains base oil. In a particularly preferred embodiment, no more than 5 wt%, preferably no more than 2 wt% of the base oil is not a Fischer-Tropsch derived base oil. Even more preferably, 100% by weight of the base oil is based on one or more Fischer-Tropsch derived base oils. Preferably, the base oil or base oil mixture comprising a Fischer-Tropsch derived base oil has a kinematic viscosity at 100 ° C. of between 2 and 30 cSt, preferably between 2.5 and 10 cSt (according to ASTM D 445).

  The total amount of base oil incorporated in the lubricating composition of the present invention is preferably in the range of 60 to 99% by weight, more preferably in the range of 65 to 90% by weight, based on the total weight of the lubricating composition. Present, most preferably in an amount ranging from 70 to 85% by weight.

  According to a preferred embodiment of the invention, the composition comprises a detergent. There is no particular restriction on the detergent used in the lubricating composition according to the present invention, and various conventional detergents can be used. Examples of detergents that can be used include oil-soluble neutral and overbased sulfonates, phenates, sulfurized phenates, thiophosphonates, salicylates and naphthenates and metals, especially alkali or alkaline earth metals such as sodium, potassium, Mention may be made of other oil-soluble carboxylates of lithium, in particular calcium and magnesium. Preferred metal detergents are neutral and overbased detergents having a TBN of 20 to 450 mg KOH / g (total base number, according to ASTM D2896). According to a preferred embodiment, the detergent has a TBN value of less than 500 mg KOH / g, such as in the range of 60 to 350, preferably less than 240 mg KOH / g, more preferably less than 200 mg KOH / g. A combination of overbased or neutral or both detergents can be used.

  Generally, the detergent, or mixture of detergents, is 0.01 to 9.0% by weight, preferably 1 based on the total weight of the lubricating oil composition fully formulated in the lubricating composition according to the invention. It is present in an amount of from 0.0 to 6.0% by weight, more preferably from 3.5 to 5.5% by weight.

  According to a preferred embodiment of the present invention, the detergent is a salicylate detergent. Examples of suitable salicylate-type detergents include products available from Infineum under the trade names “Infineum C9012,” “Infineum M7101,” “Infineum M7102,” “Infineum M7105,” “Infineum M7121,” and “Infineum M7125.” Is mentioned.

  Furthermore, according to the present invention, it is preferred that the composition comprises an amine compound. There is no particular limitation regarding the amine compound used in the lubricating composition according to the present invention, and various conventional amine compounds can be used. Examples of suitable amine compounds include monoamines, diamines and polyamines.

  According to a preferred embodiment of the present invention, the amine compound is an aromatic amine compound. Examples of suitable aromatic amine compounds include diphenylamine, alkylated diphenylamine, phenyl-α-naphthylamine (PANA), phenyl-β-naphthylamine and alkylated α-naphthylamine. Preferably, the aromatic amine is selected from optionally alkylated diphenylamine and optionally alkylated phenyl-alpha-naphthylamine, more preferably optionally alkylated diphenylamine.

  The above (optionally alkylated) diphenylamine (DPA) compounds are known in the art and are widely commercially available. Examples of suitable diphenylamines and phenyl-alpha-naphthylamines that can be used include diphenylamine (DPA), butyldiphenylamine, dibutyldiphenylamine, octyldiphenylamine, dioctyldiphenylamine, nonyldiphenylamine, dinonyldiphenylamine, heptyldiphenylamine, diheptyldiphenylamine, methylstyryl. Diphenylamine, butyl / octylalkylated diphenylamine mixture, butyl / styrylalkylated diphenylamine mixture, nonyl / ethylalkylated diphenylamine mixture, octyl / styrylalkylated diphenylamine mixture, ethyl / methylstyrylalkylated diphenylamine mixture, phenyl-alpha-naphthylamine, octyl Phenyl-Baye -Naphthylamine, t-octylphenyl-alpha-naphthylamine, phenyl-beta-naphthylamine, p-octylphenyl-alpha-naphthylamine, 4-octylphenyl-1-octyl-beta-naphthylamine, nt-dodecylphenyl-1-naphthylamine , N-hexylphenyl-2-naphthylamine and alkylated phenyl-alpha-naphthylamine mixtures, but are not limited to these. Commercial examples of diphenylamine and phenyl-naphthylamine are under the trade names Irganox L-06 and Irganox L-57, Nagulue Na38, Naululu AMS, Naurubu 438, Nagulube 438, Nagulube AMS, Nagulube 438, Irugax L-57 680, under the trade names of Naugalube APAN and Naugard PANA. T.A. Vanderbilt Company, Inc. from Vanlube DND, Vanlube NA, Vanlube PNA, Vanlube SL, Vanlube SLHP, Vanlube SS, Vanlube 81, Vanlube 848 and Vanlube 849 Is possible.

  Generally, the amine compound is 0.1 to 10.0% by weight, preferably 0.1 to 5.0% by weight, more preferably 0.2%, based on the total weight of the fully formulated lubricating oil composition. To 4.0 wt%, most preferably in an amount in the range 0.3 to 1.5 wt%.

  According to a particularly preferred embodiment of the invention, the aromatic amine compound has the general formula (I)

を有するジフェニルアミンであり、式中、それぞれのＲは、独立して、１から１６個の炭素原子、好ましくは３から１４個の炭素原子、より好ましくは４から１２個の炭素原子を有するアルキル基である。

Wherein each R is independently an alkyl group having 1 to 16 carbon atoms, preferably 3 to 14 carbon atoms, more preferably 4 to 12 carbon atoms. It is.

  Lubricating compositions according to the present invention comprise antioxidants, antiwear additives, dispersants, detergents, overbased detergents, extreme pressure additives, friction modifiers, viscosity index improvers, pour point depressants, metal One or more additives such as mobilizing agents, corrosion inhibitors, demulsifiers, antifoaming agents, seal compatibility agents and additive diluent base oils may be further included.

  Those skilled in the art are familiar with these and other additives and will not be discussed further in detail herein. Specific examples of such additives are described, for example, in Kirk-Othmer Encyclopedia of Chemical Technology, 3rd edition, volume 14, pages 477-526. The aforementioned additives are in an amount in the range of 0.01 to 35.0% by weight based on the total weight of the lubricating composition, preferably 0.05 to 25. 5% based on the total weight of the lubricating composition. It is generally present in an amount in the range of 0% by weight, more preferably 1.0 to 20.0% by weight.

  The lubricating composition of the present invention can be conveniently prepared by mixing one or more additives with (one or more) base oils.

  According to a particularly preferred embodiment of the invention, the composition has a soap content of 18 to 26 mM, preferably 20 to 24 mM, more preferably 20 to 23 mM.

  Moreover, it is preferred that the composition comprises at least 1.0% by weight of PIB succinimide compound, based on the total weight of the composition. PIB succinimide compounds are known as dispersion additives in the PCMO and HDDEO engine oil arts and are not further described herein, but suitable PIB succinimides are available from, for example, Infineum International Ltd (Abindon, UK). Obtainable. In general, the composition comprises less than 12.0%, preferably less than 10.0%, more preferably less than 9.0% by weight of PIB succinimide, based on the total weight of the composition. The composition also preferably includes at least 5.0% by weight of PIB succinimide, based on the total weight of the composition.

  The lubricating composition according to the invention is preferably a blend of so-called “low SAPS” (SAPS = sulfate ash, phosphorus and sulfur), “mid SAPS” or “regular SAPS”.

For the engine oil of passenger car motor oil (PCMO), the above range is
-Sulfate ash content (according to ASTM D 874) of 0.5 wt% or less (low SAPS), 0.8 wt% or less (mid SAPS) and 1.5 wt% or less (high SAPS), respectively.
-0.05 wt% or less (low SAPS), 0.08 wt% or less (mid SAPS) and generally 0.1 wt% or less (high SAPS) phosphorus content (according to ASTM D 5185), and- , 0.2% by weight (low SAPS), 0.3% by weight (mid SAPS) and generally 0.5% by weight (high SAPS) sulfur content (according to ASTM D 5185).

For heavy vehicle diesel engine oil, the above SAPS range is:
-1% or less (low SAPS), 1% or less (mid SAPS) and 2% or less (high SAPS) sulfate ash content (according to ASTM D 874), respectively.
-0.08 wt% or less (low SAPS) and 0.12 wt% or less (mid SAPS) phosphorus content (according to ASTM D 5185), respectively-and 0.3 wt% or less (low SAPS) and Means a sulfur content (according to ASTM D 5185) of 0.4 wt% or less (mid SAPS).

  Even if the lubricating composition is intended for another application, the lubricating composition can still meet the above SAPS range for engine oils.

  Also, the lubricating composition can meet certain industrial standards such as SAE J300 specifications (revised January 2009). Preferably, the lubricating composition according to the present invention meets SAE J300 0W-20, 5W-30, 5W-40 and 10W-40 crankcase engine oil specifications, preferably 10W-40. SAE stands for Society of Automotive Engineers.

According to the invention, the composition comprises:
Absolute viscosity at −25 ° C. of less than −7000 cp (according to ASTM D 5293),
A kinematic viscosity at 100 ° C. (according to ASTM D 445) of at least 12.5 cSt, generally less than 16.3
A high temperature of at least 3.5 cP, a high shear viscosity (“HTHS”, according to ASTM D 4683), and less than −14 wt%, preferably less than 13.0 wt%, more preferably less than 11.0 wt%, More preferably less than 10.5 wt.%, Most preferably less than 10.0 wt.% Noack volatility (according to ASTM D 5800)
It is particularly preferred to have

  The lubricating composition according to the present invention can be used as transmission oil, grease, hydraulic oil, turbine oil, compressor oil, etc. in various applications such as in an internal combustion engine (as engine oil).

  In another aspect, the present invention provides the use of the lubricating composition described herein to improve deposit reduction properties, particularly as measured by ASTM D 7097-09.

  The invention is described below with reference to the following examples, which are in no way intended to limit the scope of the invention.

Lubricating oil compositions Various combinations of additives and base oils were formulated. Table 1 shows the characteristics of the base oil used. Table 2-4 shows the amount of additive when incorporated into each base oil ("Base Oil 1" or "Base Oil 2"). All compositions except “Blank 1” in Tables 2 and 4 and “Blank 3” and “Blank 4” in Table 3 contain 500 ppm of antioxidant (additive “A0”) and added. The dosage (remaining base oil, and 500 ppm of A0) is given in weight percent based on the total weight of the additive (s) plus base oil. “Blank 2” in Tables 2 and 4 contained no other additive in addition to the above-mentioned A0 of 500 ppm. For ease of reference, Tables 2 and 4 also include a reference to “Mixture 1-38” containing a base oil, additive A0, and a combination of two or more other additives.

“Base oil 1” (ie, “BO1” or “GTL 4”) is a Fischer-Tropsch derived base oil having a kinematic viscosity (ASTM D445) at 100 ° C. of about 3.9 cSt (mm ² s ⁻¹ ). It was. Base oil 1 can be conveniently prepared, for example, by the method described in WO-A-02 / 070631, the teachings of which are incorporated herein by reference.

  “Base oil 2” (or “BO 2”) was a commercially available Group III base oil having a kinematic viscosity at 100 ° C. (ASTM D445) of about 4.3 cSt. The base oil 2 is commercially available, for example, from SK Energy (Ulsan, Korea) under the trade name “Yubase 4”.

The following additives A0-A17 were used. That is,
-A0: Octylated / Butylated Diphenylamine (DPA), available from CIBA Specialty Chemicals (Basel, Switzerland) under the trade name "Irganox L-57".
-A1: Low BI (basicity index) salicylate detergent (Ca-based), available from Infineum International Ltd (Abindon, UK) under the trade name "Infineum M7102." Characteristics: Vk40 (270), Vk100 (19), TBNE (equivalent of total base number (ASTM D 2896), mgKOH / g) = 64, Ca (wt%) = 2.3.
-A2: Medium BI salicylate detergent (Ca-based), Infineum International Ltd. Available under the trade name "Infineum M7121". Characteristics: Vk40 (1130), Vk100 (95), TBNE (mgKOH / g) = 225, Ca (wt%) = 8.0%, Mg (wt%) = 0.24.
-A3: High BI salicylate detergent (Ca-based), Infineum International Ltd. Available under the trade name "Infineum M7125". Characteristics: Vk40 (835), Vk100 (100), TBNE (mgKOH / g) = 350, Ca (wt%) = 12.5, Mg (wt%) = 0.3.
-A4: Reaction product of acidic organic compounds, boron compounds and basic organic compounds, available from Chemtura. See, for example, US2005 / 0172543, especially this paragraph [0025]-[0077].
-A5: sulfonate detergent, Infineum International Ltd. Available under the trade name "Infineum C9350".
-A6: Phenate detergent, Infineum International Ltd. Available under the trade name "Infineum C9380".
-A7: Overbased calcium sulfonate detergent, Chevron Oronite S. A. (Lubaroapele, France), available under the trade name “OLOA 249 SX”.
-A8: Phenate detergent, Infineum International Ltd. Available under the trade name “Infineum C9394”.
-A9: zinc dialkyldithiophosphate (ZDTP), Infineum International Ltd. Available under the trade name "Infineum C9417".
-A10: PIB succinimide dispersant, Infineum International Ltd. Available under the trade name "Infineum C9280".
-A11: Boronated low MW ashless dispersant, Infineum International Ltd. Available under the trade name "Infineum C9230".
-A12: High MW boronated ashless dispersant, Infineum International Ltd. Available under the trade name "Infineum C9260".
-A13: Mg salicylate detergent, Infineum International Ltd. Available under the trade name “C9012”.
-A14: sulfonate detergent, Infineum International Ltd. Available under the trade name "Infineum C9330".
-A15: poly (hydroxycarboxylic acid) amide salt derivative, available from Shanghai Sanzheng Polymer Company under the trade name "CH-5".
-A16: poly (hydroxycarboxylic acid) amide salt derivative, available from Shanghai Sanzheng Polymer Company under the trade name "CH-7".
-A17: Phenate detergent, Chevron Oronite S. A. Available under the trade name "OLOA 219C".

TEOST MHT Test To demonstrate improved piston deposit properties of the lubricating composition according to the present invention, the piston deposit at moderately high temperature by (TEOST MHT) by a thermal oxidation engine oil simulation test according to ASTM D 7097-09. Measurements were made using standard test methods for the measurements. This test was conducted at 285 ° C. under oxidative and catalytic (0.1 g Pb / Fe / Sn / liquid naphthenic) conditions with a thin membrane exposed to repeated passage of 8.5 g of engine oil above the rod. The mass of the deposit formed on the specially configured test rod is measured. The measurements for all deposits (filter deposit + rod deposit) obtained using the standard conditions outlined in ASTM D 7097-09 are shown in Table 2 above.

Cam Baffle Bench Cleaner Test WO 2007/128740 (28 except to use the following evaluations: Black = not clean, + = clean and ++ = completely clean to show the deposit control properties of the lubricating composition. Measurements were performed using the bench screener test described on page 11 line-page 29 line 4). The measured evaluation is shown in Table 3 below.

  The same base oils used above, BO1 and BO2, were used. Moreover, the definition about an additive was shown above.

Komatsu Hot Tube Test To demonstrate the improved piston deposit properties of the lubricating composition according to the present invention at high temperatures, the standard Komatsu hot tube test (“KHTT”, JPI-5S-55-99, JPI Measurement was also performed using The measured evaluation is shown in Table 4 below.

  The same base oils used above, BO1 and BO2, were used. Moreover, the definition about an additive was shown above.

Formulations of SAE J1899 (Grade 50) In addition, various compositions were formulated that meet the specifications of SAE J1899 (Grade 50) (revised August 2005) for use in aviation piston engines.

  Table 5 shows the compositions of the tested lubricating compositions (Examples 1 and 2 and Comparative Examples 1 and 2) and the amounts of the components are given in weight percent based on the total weight of the composition.

“Base oil 3” was a commercially available Group I base oil having a kinematic viscosity at 100 ° C. (ASTM D445) of about 31.6 cSt (mm ² s ⁻¹ ). Base oil 3 is commercially available, for example, from Shell Canada Products (Blockville, Ontario, Canada) under the trade designation “HVI 650”.

“Base oil 4” was a Fischer-Tropsch derived base oil (“GTL 8”) having a kinematic viscosity (ASTM D445) at 100 ° C. of about 8 cSt (mm ² s ⁻¹ ). This GTL base oil can be conveniently prepared, for example, as described in WO 02/070631, the teachings of which are incorporated herein by reference.

  “Base oil 5” is a Fischer-Tropsch derived base oil (“GTL 5”) having a kinematic viscosity at 100 ° C. (ASTM D445) of about 5 cSt, which GTL base oil is described in, for example, the above-mentioned WO 02/070631 It can be conveniently produced in the same way as

  “CH-5” was a poly (hydroxycarboxylic acid) amide salt derivative commercially available from Shanghai Sanzheng Polymer Company under the trade name “CH-5”. “CH-5” is approximately 2.0 mg. As measured by ASTM D 4739. It has a TBN value of KOH / g. Moreover, “CH-5” has a sulfur content of about 0.86 wt% as measured by ICP-AES.

  “Syn-O-Ad 8485” was a product commercially available from Supresta (Akzo Nobel, Amersfoort, The Netherlands) under the trade name “Syn-O-Ad 8485”. Syn-O-Ad 8485 contains a mixture of triaryl esters including up to 60% by weight of trialkylated triaryl phosphate esters.

  "Additive Package" (same in all SAE J1899 (Grade 50) formulations) is phenolic antioxidant, viscosity modifier, pour point depressant, triazole corrosion inhibitor, glycerol monooleate friction improvement Contains conventional combinations of additives, including agents and antifoam agents.

  The compositions of Example 1-2 and Comparative Example 1-2 were obtained by mixing the base oil with the additive package and other additives using conventional lubricant mixing procedures.

  The formulation of SAE J1899 (Grade 50) from Examples 1 and 2 (containing CH-5) appeared to provide improved lead dispersion properties.

Discussion As can be seen from Table 2, the deposition for the composition according to the invention having a TBN value of 3.5 to 70 mg KOH / g and a soap content of 15 to 30 mM in a Fischer-Tropsch derived base oil (Base oil 1) Improvement of the prevention properties has progressed when compared to the same formulation based on mineral derived base oil (Base Oil 2).

  Also, SAE 75W-80 transmission fluid, which contains Fischer-Tropsch derived base oil and uses API GL-5 type additive chemicals, is gear and bearing when the gearbox is operated for about 600000 km. It was found that no part of this part produced visible wear, sludge and deposits. Analysis of the oil showed no significant oil degradation and very slow metal wear rates.

Claims (10)

  A base oil selected from the group consisting of a Fischer-Tropsch derived base oil and a poly-alpha olefin (PAO) base oil or a combination thereof, and a TBN of 3.5 to 70 mg KOH / g measured by ASTM D 2896 ( A lubricating composition having a total base number) value and having a soap content of 15 to 30 mM.   The base oil contains more than 50 wt%, preferably more than 60 wt%, more preferably more than 70 wt%, even more preferably more than 80 wt%, most preferably more than 90 wt% Fischer-Tropsch derived base oil The lubricating composition according to claim 1.   Lubricating composition according to claim 1 or 2, comprising a detergent, preferably a salicylate detergent.   4. Lubricating composition according to claim 3, wherein the detergent has a TBN value of less than 500 mg KOH / g, preferably in the range of 60 to 350 mg KOH / g.   Lubricating composition according to any one of claims 1 to 4, comprising an amine compound, preferably an aromatic amine compound, more preferably an amine compound selected from diphenylamine and phenyl-alpha-naphthylamine. The aromatic amine compound has the general formula (I)

[Wherein each R is independently an alkyl group having 1 to 16 carbon atoms, preferably 3 to 14 carbon atoms, more preferably 4 to 12 carbon atoms. ]
The lubricating composition of claim 5, which is diphenylamine having   Lubricating composition according to any one of the preceding claims, having a soap content of 18 to 26 mM, preferably 20 to 24 mM.   8. Lubricating composition according to any one of claims 1 to 7, comprising at least 1.0% by weight of PIB succinimide compound, based on the total weight of the composition. -Sulfate ash content of 1.0 wt% or less,
The lubricating composition according to any one of claims 1 to 8, having a phosphorus content of -0.08 wt% or less and a sulfur content of -0.3 wt% or less.   10. Use of a lubricating composition according to any one of claims 1 to 9 to improve deposit reduction properties, especially as measured by ASTM D 7097-09.