JP2010538120A - Sliding surface lubricant composition, its production and use - Google Patents

Abstract

  A sliding surface lubricant composition is provided. The composition has a number of consecutive carbon atoms, as measured according to ASTM D-1401-2002, in sufficient quantity for the composition to separate from water in less than 60 minutes at 54C, and nd Includes isomerized base oils that are less than 10% by weight naphthenic carbon by the -M method. In one embodiment, the composition contains no or little demulsifying additive. In other embodiments, the composition includes, but is not limited to, P47, P50 and P53 Cincinnati Milacron specifications for grades 68, 220 and 32, as required by machine tool and compressed air tool manufacturers. Meet.

Description

  The present invention relates generally to compositions suitable for use as lubricants, and more particularly for use as sliding surface lubricants.

  The sliding surface is a machine designed to give the machine tool a moving surface that is stable under load (ie with minimal displacement) with a constant finish that gives a constant frictional force regardless of the speed of movement. It is a typical guide surface. Machine builders have achieved this design goal by manufacturing sliding surfaces in various arrangements (horizontal, vertical, inclined) and from various different materials (iron, steel or plastic). It was. Machine tools have very close tolerances, for example, the tolerance in the manufacture of camshafts may be only about 1 micron, but it is often required to make articles. For this purpose, the machine tool must be accurately positioned. Sliding surface lubricants are used to lubricate the surface on which the machine tool is mounted in order to facilitate the required positioning and thereby maximizing the sliding surface performance.

  In typical applications, such as hydraulic operation, the machine tool may come into contact with dirty water that can adversely affect machining performance. Good water separability is highly needed in sliding surface lubricant compositions. In the prior art, demulsifying additives (or demulsifiers) such as copolymers of ethylene oxide and propylene oxide are typically used to help improve the demulsibility of the lubricant. Some prior art sliding surface lubricants tend to not fully dissolve the demulsifier and form troublesome precipitates that can cause clogging in the machine tool.

  A number of patent publications and applications are incorporated herein by reference: US Patent Application Publication No. 2006/0289337, US Patent Application Publication No. 2006/0201851, US Patent Application Publication No. 2006/0016721. US Patent Application Publication No. 2006/0016724, US Patent Application Publication No. 2006/0076267, US Patent Application Publication No. 2006/020185, US Patent Application Publication No. 2006/013210 , US Patent Application Publication No. 2005/0241990, US Patent Application Publication No. 2005/0077208, US Patent Application Publication No. 2005/0139513, US Patent Application Publication No. 2005/0139514, US Patent Application Publication No. 2005/013 No. 409, U.S. Patent Application Publication No. 2005/0133407, U.S. Patent Application Publication No. 2005/02611147, U.S. Patent Application Publication No. 2005/02611146, U.S. Patent Application Publication No. 2005/0261145. US Patent Application Publication No. 2004/0159582, US Patent No. 7018525, US Patent No. 7083713, US Patent Application No. 11/400570, US Patent Application No. 11/535165 In the specification and US patent application Ser. No. 11/613936, alternative hydrocarbon products, such as Fischer-Tropsch base oil, are produced by a process in which the feed is a waxy feed recovered from Fischer-Tropsch synthesis. Is done. This process comprises a complete or partial hydroisomerization dewaxing step using a dual functioning catalyst or a catalyst capable of selectively isomerizing paraffins. Hydroisomerization dewaxing is achieved by contacting the hydroisomerization catalyst with a waxy feed in the isomerization zone under hydroisomerization conditions.

  Fischer-Tropsch synthesis products can be produced, for example, by commercially available SASOL® slurry phase Fischer-Tropsch technology, commercially available SHELL® middle distillate synthesis (SMDS) or non-commercial but EXXXON® modifications. It can be obtained by a well-known method such as a gas conversion method (AGC-21). Details of these methods and others are disclosed in, for example, European Patent Publication Nos. 769959, 668342, U.S. Pat. Nos. 4,943,672, 5,059,299, and 5,733,839. And US Reissue Patent No. 39073, US Patent Application Publication No. 2005/0227866, International Publication Nos. 9934917, 9920720, and 05107935. Fischer-Tropsch synthesis products typically include hydrocarbons having 1-100, or even 100 or more, carbon atoms, and typically include paraffins, olefins, and oxygenated products. Fischer-Tropsch is a viable method for producing clean alternative hydrocarbon products.

  There is a need for new sliding surface lubricant compositions that have excellent demulsibility and contain alternative hydrocarbon products.

  In one aspect, the present invention provides a) a base oil comprising at least one isomerized base oil having a continuous number of carbon atoms and having a naphthenic carbon content of less than 10% by weight by the ndM method; b) 0 0.001 to 10% by weight of additive package, antioxidant, high pressure agent, friction modifier, adhesive additive, anti-wear agent, metal immobilizing agent, antifoaming agent, demulsifier, and mixtures thereof A sliding surface lubricant composition comprising at least one additive that is sufficient to separate the composition from water in less than 60 minutes as measured according to ASTM D-1401-2002. A sliding surface lubricant composition comprising an amount of isomerized base oil. In one embodiment, the sufficient amount is 95-99.999% by weight.

  In another aspect, the present invention relates to a method for demulsifying a sliding surface lubricant, which method separates the lubricant from water in less than 60 minutes as measured according to ASTM D-1401-2002. Adding a sufficient amount of isomerized base oil to a base oil typically used to condition a sliding surface lubricant, said isomerized base oil having a continuous number of carbon atoms; The naphthenic carbon is less than 10% by weight by the ndM method, and the typical base oil is one of mineral oil, alpha olefin oligomer, ester, synthetic hydrocarbon oil, and mixtures thereof. is there.

  In yet another aspect, another method of demulsifying a sliding surface lubricant is provided, wherein the method separates the lubricant from water in less than 60 minutes as measured according to ASTM D-1401-2002. Preparing a base oil comprising a sufficient amount of isomerized base oil to provide a continuum number of carbon atoms, less than 10% by weight naphthene carbon by the ndM method. .

  The following terms are used throughout the present specification and have the following meanings unless otherwise indicated.

  By the term improved demulsibility (demulsification performance) is meant the ability of oil to separate from water. An established test for assessing the ability of industrial oils to separate from water is ASTM D1401. In this test, 40 ml of oil is mixed with 40 ml of water at 54 ° C., and the time required for the resulting emulsion to decrease to 3 ml or less (considered as complete separation) is recorded. If complete separation does not occur, record the volume of oil, water and emulsion present.

  As used herein, the term “sliding surface” can be used interchangeably with “sliding surface” or “guide surface”, and the term “sliding surface lubricant” refers to “sliding surface composition”. Or it can be used interchangeably with the term “sliding surface lubricant composition”.

  The term “derived from Fischer-Tropsch” means a product, fraction, or feed that originates from or is made at a stage by the Fischer-Tropsch process. As used herein, the term “Fischer-Tropsch base oil” refers to “FT base oil”, “FTBO”, “GTL base oil (GTL: gas to liquid)” or “Fischer-Tropsch derived base”. Can be used interchangeably with the term “oil”.

  As used herein, the term “isomerized base oil” refers to a base oil made by isomerizing a waxy feed.

  As used herein, a “waxy feed” comprises at least 40% by weight n-paraffins. In one embodiment, the waxy feed comprises greater than 50% by weight n-paraffins. In another embodiment, greater than 75% by weight n-paraffins. In one embodiment, the waxy feed also has very low levels of nitrogen and sulfur, for example, less than 25 ppm combined nitrogen and sulfur, or in another embodiment, less than 20 ppm. Examples of waxy feeds include slack wax, deoiled slack wax, refined waxy oil, waxy lubricating raffinate, n-paraffin wax, NAO wax, wax produced by chemical factory processes, deoiled petroleum derived wax, Microcrystalline wax, Fischer-Tropsch wax, and mixtures thereof are included. In one embodiment, the waxy feed has a pour point of greater than 50 ° C. In other embodiments, greater than 60 ° C.

The term “kinematic viscosity” is a measure of resistance to liquid flow under gravity, expressed in mm ² / s, and is measured according to ASTM D445-06.

  The term “viscosity index” (VI) is an empirical, unitless number that represents the effect of temperature change on the kinematic viscosity of an oil. The higher the VI of the oil, the lower the tendency of the viscosity change with temperature. The viscosity index is measured according to ASTM D2270-04.

  Cold Cranking Simulator Apparent Viscosity (CCS VIS) is measured in millipascal seconds, mPa. This is a measurement for measuring the viscosity characteristics of a lubricating base oil represented by s under low temperature and high shear. CCS VIS is measured according to ASTM D5293-04.

  The boiling range distribution of the base oil is expressed in weight% and is ASTM D 6352-04 “Gas Chromatography Boiling Range Distribution of Petroleum Distillates in Boiling Range from 174 to 700 ° C. 174 to 700 ° C. by Gas Chromatography) ”.

  The term “Noack volatiles” is measured in accordance with ASTM D 5800-05, Procedure B and is expressed in weight percent lost when the oil is heated to 250 ° C. and a steady stream of air is passed through it for 60 minutes. Is defined as the amount of oil consumed.

  Brookfield viscosity is used to determine the internal liquid friction of a lubricating oil during low temperature operation and can be measured by ASTM D2983-04.

  The term “pour point” is a measurement of the temperature at which a base oil sample begins to flow under specific conditions that are carefully controlled and may be measured as described in ASTM D5950-02.

  The term “self-ignition temperature” is the temperature at which a liquid ignites immediately when in contact with air and can be measured according to ASTM 659-78.

  The term “Ln” refers to the natural logarithm base of “e”.

  The term “traction coefficient” is a unique indicator of lubricant properties, expressed as the ratio of the dimensionless number of friction force F and normal force N, where friction is a sliding or rotating surface. It is a mechanical force that resists or impedes movement between movements. The traction coefficient was measured by PCS Instruments, Ltd., where a polished 19 mm diameter sphere (SAE AISI 52100 steel) was placed at an angle of 220 relative to a 46 mm diameter polished flat (SAE AISI 52100 steel). It can be measured by MTM Traction Measurement System. Steel balls and flats are independently measured at an average rotational speed of 3 m / sec, a rotation to slide ratio of 40%, and a load of 20N. The rotation ratio is the average speed of the sphere and the flat board divided by the sliding speed difference between the sphere and the flat board, that is, the rotation ratio = (speed 1−speed 2) / ((speed 1 + speed 2) − / 2).

  As used herein, the term “number of consecutive carbon atoms” means that the base oil has a distribution of hydrocarbon molecules over a range of carbon numbers with all numbers of carbons in between. . For example, the base oil may have hydrocarbon molecules with all the carbon numbers in the range C22-C36 or C30-C60. As a result of the waxy feed also having a continuous number of carbon atoms, the hydrocarbon molecules of the base oil differ from each other by the number of consecutive carbon atoms. For example, in a Fischer-Tropsch hydrocarbon synthesis reaction, the carbon atom originates from CO and the hydrocarbon molecule is made up of one carbon atom at a time. Petroleum-derived waxy feeds have a continuous number of carbon atoms. In contrast to polyalphaolefin-based oils ("PAO"), isomerized base oil molecules have a more linear structure with a relatively long backbone with short branches. In the classic textbook PAO description, it is a star-shaped molecule, in particular tridecane, shown as three decane molecules linked at a central point. On the other hand, although star-like molecules are theoretical, PAO molecules still have fewer and longer branches than the hydrocarbon molecules that make up the isomerized base oils disclosed herein.

  The term “molecule having a cycloparaffinic functional group” means any molecule that is a monocyclic or condensed multicyclic saturated hydrocarbon group or includes one or more substituents.

  The term “molecule having a monocycloparaffinic functional group” refers to any molecule that is a monocyclic saturated hydrocarbon group of 3 to 7 ring carbons or monocyclic saturation of 1 to 7 ring carbons. By any molecule substituted with a hydrocarbon group.

  The term “molecule having a multicycloparaffinic functional group” is any molecule that is a condensed multicyclic saturated hydrocarbon ring group of two or more fused rings, one or more condensed rings of two or more fused rings By any molecule substituted with a multicyclic saturated hydrocarbon ring group, or any molecule substituted with one or more monocyclic saturated hydrocarbon groups of 3 to 7 ring carbons is meant.

  Molecules with cycloparaffinic functional groups, molecules with monocycloparaffinic functional groups, and molecules with multicycloparaffinic functional groups are expressed in weight%, field ionization mass spectrometry (FIMS), HPLC for aromatics -Determined in combination with proton NMR for UV, olefin, but described in more detail herein.

Oxidator BN measures the response of a lubricant in a simulated application. A high value or a long time to absorb 1 liter of oxygen indicates good stability. Oxidator BN can be measured by a Dornte type oxygen absorber (RW Dorte “Oxidation of White Oils”, Industrial and Engineering Chemistry, Vol. 28, page 26, 1936). The time for 1000 mL of O _{2 to} be absorbed by 100 g of oil at 1 atmosphere of pure oxygen, 340 ° F. is reported. In the Oxidator BN test, 0.8 mL of catalyst is used per 100 g of oil. The catalyst is a mixture of soluble metal naphthenates that mimics the average metal analysis of crankcase oil after use. The additive package is 80 millimoles of zinc bispolypropylenephenyl dithiophosphate per 100 grams of oil.

  Molecular characterization includes field ionization mass spectrometry (FIMS) and ndM analysis (ASTM D3238-95 (reapproved 2005)) and can be performed by methods known in the art. In FIMS, base oils are characterized as molecules with alkanes and various numbers of unsaturation. Molecules with various numbers of unsaturations can include cycloparaffins, olefins, and aromatics. If they contain significant amounts of aromatics, they will be identified as 4-unsaturated. If they contain significant amounts of olefins, they will be identified as 1-unsaturated. From the sum of 1-unsaturated, 2-unsaturated, 3-unsaturated, 4-unsaturated, 5-unsaturated and 6-unsaturated from FIMS analysis, by weight% of olefin by proton NMR and by HPLC-UV Subtracting the aromatic weight percent gives the total weight percent of molecules with cycloolefin functionality. When the aromatic content was not measured, it was assumed to be less than 0.1 wt% and was not included in the calculation of the total wt% of molecules with cycloparaffinic functionality. The total weight percent of molecules with cycloparaffinic functionality is the sum of the weight percent of molecules with monocycloparaffinic functionality and the weight percent of molecules with multicycloparaffinic functionality.

  Molecular weight is measured according to ASTM D2503-92 (Reapproved 2002). This method uses thermal current measurement of vapor pressure (VPO). As an alternative, ASTM D2502-94 may be used when sufficient sample volume is not available, and will be displayed if this is used.

  Density is measured by ASTM D4052-96 (Reapproved 2002). A sample is introduced into the vibrating sample tube, and the change in vibration frequency due to the change in mass of the tube is used in connection with the calibration data to determine the density of the sample.

  The weight percent of olefin can be determined by proton NMR according to the steps set forth herein. In most tests, the olefin was a detected mixture of normal olefins, ie, types of olefins with hydrogen bonded to double bond carbons such as alpha, vinylidene, cis, trans, and tri-substituted. The integral ratio of allyl to olefin is between 1 and 2.5. If this ratio exceeds 3, it indicates a high proportion of tri- or tetra-substituted olefins, and other assumptions known in the analytical field can be made for the calculation of the number of double bonds in the sample. The steps proceed as follows. A) Prepare a 5-10% solution of the hydrocarbon to be tested in deuterated chloroform. B) With a spectral width of at least 12 ppm, with an accurate reference of the chemical shift (ppm) axis, sufficient gain width to obtain a signal that does not overload the receiver / ADC of the device, eg 30 ° When the pulse is given, a normal proton spectrum is obtained using a device with a minimum signal digitization dynamic range of 65,000. In one embodiment, the device has a dynamic range of at least 260,000. C) Measure the integrated intensity between 6.0-4.5 ppm (olefin); 2.2-1.9 ppm (allyl); 1.9-0.5 ppm (saturated). D) Calculate using the molecular weight of the test substance as measured by ASTM D2503-92 (Reapproved 2002): 1. Average molecular formula of saturated hydrocarbons; 2. Average molecular formula of olefin; 3. total integrated intensity (= sum of all integrated intensities); 4. Integrated intensity per hydrogen of sample (= total integrated intensity / number of hydrogens in the equation); 5. Olefin hydrogen number (= olefin integral / integral per hydrogen); 6. number of double bonds (= product of olefin hydrogen and number of hydrogen in olefin formula / 2); % By weight of olefin by proton NMR = 100 × number of double bonds × number of hydrogen in typical olefin molecule divided by number of hydrogen in typical test substance molecule. In this test, the olefin weight%, D, according to the proton NMR calculation procedure, works particularly well when the olefin fraction is low and less than 15 weight%.

  The aromatic weight percent in one embodiment may be measured by HPLC-UV. In one embodiment, the test was performed using a Hewlett Packard 1050 series quadruple gradient high resolution liquid chromatography (HPLC) system and using an HP 1050 diode array UV-Vis detector in combination with HP-Chem-station. Is done. Identification of individual aromatic classes in highly saturated base oils can be made based on UV spectral patterns and elution times. The amino column used in this analysis distinguishes aromatic molecules based primarily on the number of rings (or the number of double bonds). In this way, molecules containing monocyclic aromatics elute first, followed by polycyclic aromatics in order of increasing number of double bonds per molecule. For aromatics with similar double bond properties, those with only alkyl substituents on the ring elute faster than those with naphthenic substitution. The unambiguous identification of various base oil aromatic hydrocarbons from their UV absorption spectra indicates that their electronic transition peaks are compared to alkyl and naphthenic substitutions on the ring system compared to pure model compound analogs. It can be achieved by recognizing that all are red-shifted depending on the amount. The quantification of the eluting aromatic compound may be performed by integrating the chromatogram obtained from wavelengths optimized for each generalized class of compound over the appropriate retention time window for that aromatic. Retention time window boundaries for each aromatic class are determined based on manual evaluation of the respective absorption spectra of compounds eluting at different times and qualitative similarity to the absorption spectra of model compounds. It can be determined by applying it to the class.

  HPLC-UV calibration curve. In one embodiment, HPLC-UV can be used to identify classes of aromatic compounds even at very low levels, for example, polycyclic aromatics are more typical than monocyclic aromatics. Absorbs 10 to 200 times more strongly. Alkyl substitution affects absorption by 20%. The integration limit for simultaneously eluting 1-ring and 2-ring aromatics at 272 nm can be performed by the vertical drop method. The wavelength-dependent response factor for each general aromatic class is determined by first creating a Beer's law plot from a pure model compound mixture based on the closest absorption spectrum peak for the substituted aromatic analog. Can be determined. The weight percent concentration of aromatics can be calculated by assuming that the average molecular weight for each aromatic class is approximately equal to the average molecular weight for all base oil samples.

  NMR analysis. In one embodiment, the weight percent of all molecules having at least one aromatic function in the purified monoaromatic standard can be confirmed by carbon-13 NMR analysis over time. NMR results show that 95% to 99% of aromatics in highly saturated base oils are monocyclic aromatics, so that% aromatic carbon to% aromatic molecules (HPLC-UV and D2007 Can be converted). In another test by NMR to accurately measure all molecules with low levels of at least one aromatic functional group, a 15-hour measurement at 400-500 MHz NMR using a 10-12 mm Nanorac probe was performed. Can be used to modify the standard D 5292-99 (Reapproved 2004) method to give a minimum carbon sensitivity of 500: 1 (according to ASTM standard operation E386). Acorn PC integration software can be used to define the baseline shape and perform consistent integration.

The degree of branching refers to the number of alkyl branches in the hydrocarbon. Branches and branch positions can be determined using carbon 13 ( ¹³ C) NMR according to the following 9-step process. 1) CH branch center and CH ₃ using DEPT pulse sequence (Doddell, DT; DT Pegg; MR Bendall, Journal of Magnetic Resonance, 1982, 48, 323 et seq.) Identify branch termination points. 2) Carbon that initiates multiple branches using an APT pulse sequence (Patt, SL; JN Schoolery, Journal of Magnetic Resonance, 1982, 46, 535 onwards) (quaternary) Confirm that there is no carbon). 3) Values compiled and calculated as tables known in the art (Lindeman, LP, Journal of Qualitative Analytical Chemistry, Vol. 43, 1971, 1245 et seq; Netzel, DA et al., Fuel, Vol. 60, 1981, pp. 307) is used to fit the resonances of various branched carbons to specific branch positions and lengths. 4) different carbon positions by comparing the integrated strength of a particular carbon of a methyl / alkyl group with the integrated strength of one carbon (which is equal to the total integrated strength / number of carbons per molecule in the mixture). Estimate the relative branch density at. Both the terminal and branched methyl are in the same resonance position, but for 2-methyl branches, the intensity is divided by 2 before estimating the branch density. If the 4-methyl branch fraction is calculated and tabulated, its contribution to 4 + methyl is subtracted to avoid double counting. 5) Calculate the average carbon number. The average carbon number is determined by dividing the molecular weight of the sample by 14 (which is the formula weight of CH ₂ ). 6) The number of branches per molecule is the sum of the branches obtained in the fourth step. 7) The number of alkyl branches per 100 carbon atoms is calculated from the number of branches per molecule (step 6) x 100 / average carbon number. 8) Estimate the branching index (BI) by ¹ HNMR analysis. This is expressed as a ratio of methyl hydrogen (chemical shift range: 0.6 to 1.05 ppm) in the total hydrogen estimated by NMR in the liquid hydrocarbon composition. 9) Branch proximity (BP) is estimated by ¹³ C NMR. This is the NMR in a liquid hydrocarbon composition of a recurring methylene carbon, which is carbon that is 4 or more carbons away from the end group or branch (as represented by the 29.9 ppm NMR signal). Expressed as a percentage of total carbon estimated by. The measurement can be performed using any Fourier transform NMR spectrometer, such as one having a 7.0 T or higher magnet. After confirming the absence of aromatic carbon by mass spectrometry, UV or NMR survey, the spectral width in the ¹³ C NMR test is limited to the 0-80 ppm region relative to the saturated carbon region, TMS (tetramethylsilane). can do. A 25-50 wt% solution in chloroform-d1 is excited with a 30 ° pulse, followed by a collection time of 1.3 seconds (sec.). In order to minimize inhomogeneous intensity data, wide proton reverse gate decoupling is used during the 6 second delay prior to the excitation pulse and during the acquisition time. In order to ensure observation at the highest intensity, 0.03-0.05 M Cr (acac) ₃ (tris (acetylacetonato) -chromium (III)) is doped into the sample as a relaxation agent. DEPT and APT sequences can be performed according to literature descriptions with minor modifications described in Varian or Bruker operating manuals. DEPT is a distortionless enhancement by polarization transfer. The DEPT45 sequence gives a signal for all carbons attached to protons. DEPT90 shows only CH carbon. DEPT 135 shows CH and CH ₃ up and CH ₂ 180 ° out of phase (down). APT is an attached proton test and is well known in the art. It is to be observed all carbon, if CH and CH ₃ are up, quaternary carbon and CH ₂ are down. The branching properties of the sample can be determined by ¹³ C NMR using the assumption that all samples are iso-paraffinic in the calculation. The unsaturated content can be measured using field ionization mass spectrometry (FIMS).

  In one embodiment, a sliding surface lubricant composition with excellent demulsibility includes optional additives in a base oil matrix or base oil blend.

  Base oil matrix component: In one embodiment, the blend of base oil or sliding surface lubricant composition is the product itself, its fraction or feed, from the isomerization of the waxy feed from the Fischer-Tropsch process. It contains at least one isomerized base oil derived from or produced at any stage thereof by isomerization (“Fischer-Tropsch derived base oil”). In another embodiment, the base oil comprises at least an isomerized base oil made from a substantially paraffinic wax feed (“waxy feed”).

  Fischer-Tropsch derived base oils are described, for example, in US Pat. Nos. 6,080,301, 6,090,909 and 6,165,949, and US 2004/0079678, 2005/0133409. No. 2006/0289337, and is disclosed in a number of patent publications. The Fischer-Tropsch process converts carbon monoxide and hydrogen into various forms of liquid hydrocarbons, including light and waxy reaction products, both of which are essentially paraffinic It is a catalytic chemical reaction.

In one embodiment, the isomerized base oil has a continuous number of carbon atoms and has less than 10 wt% naphthenic carbon by the ndM method. In yet another embodiment, the isomerized base oil made from the waxy feed has a kinematic viscosity at 100 ° C. of between 1.5 and 3.5 mm ² / s.

  In one embodiment, the isomerized base oil comprises a base oil having a) less than 0.30 weight percent of all molecules having at least one aromatic functional group; b) at least one cycloparaffinic functional group. The weight percent of all molecules having greater than 10; c) the ratio of the weight percent of molecules with monocycloparaffinic functionality to the weight percent of molecules with multicycloparaffinic functionality is greater than 20; and d) the viscosity index Is produced by a process in which the hydroisomerization dewaxing step is carried out under conditions sufficient to exceed 28 × Ln (kinematic viscosity at 100 ° C.) + 80.

In other embodiments, the isomerized base oil is highly enriched using a shape selective intermediate pore size molecular sieve comprising a dilute metal hydrogenation component and under conditions of 600-750 ° F. (315-399 ° C.). Paraffin wax is made from a process where hydroisomerization is performed. In this process, the conversion of compounds having boiling points above 700 ° F. (371 ° C.) in the wax feed to compounds having boiling points below 700 ° F. (371 ° C.) is 10% and 50% by weight. The conditions of the hydroisomerization step are controlled to be maintained in between. The resulting isomerized base oil has a kinematic viscosity at 100 ° C. of between 1.0 and 3.5 mm ² / s and a Noack volatile content of less than 50% by weight. The base oil contains more than 3% by weight of molecules with cycloparaffinic functional groups and less than 0.30% by weight of aromatics.

In one embodiment, the isomerized base oil has a Noack volatile content less than the amount calculated by the following formula: 1000 x (kinematic viscosity at 100 ° C) ^-2.7 . In another embodiment, the isomerized base oil has a Noack volatile content less than the amount calculated by the following formula: 900x (kinematic viscosity at 100 ° C) ^-2.8 . In a third embodiment, the isomerized base oil has a kinematic viscosity at 100 ° C.> 1.808 mm ² / s and a Noack volatile content of the following formula: 1.286 + 20 (kv100) ^−1.5 + 551.8e ^-Less than the amount calculated by ^kv100 . Here, kv100 is a kinematic viscosity at 100 ° C. In a fourth embodiment, the isomerized base oil has a kinematic viscosity at 100 ° C. of less than 4.0 mm ² / s and a weight percent Noack volatile content between 0 and 100. In a fifth embodiment, the isomerized base oil has a kinematic viscosity between 1.5 and 4.0 mm ² / s and a Noack volatile content of the following formula: 160-40 (kinematic viscosity at 100 ° C.) Has a Noack volatile less than the calculated Noack volatile.

In one embodiment, the isomerized base oil has a kinematic viscosity at 100 ° C. in the range of 2.4 and 3.8 mm ² / s and a Noack volatile content of the formula: 900 × (kinematic viscosity at 100 ° C.) ^−2.8 Less than the amount specified by -15. For kinematic viscosities in the range of 2.4 and 3.8 mm ² / s, the formula: 900x (100 Kinematic Viscosity at ° ^C.) -2.8 -15 has the formula: 160 - 40 (Kinematic Viscosity at 100 ° C.) Gives lower Noack volatiles.

In one embodiment, the base oil has a kinematic viscosity at 100 ° C. of 3.6 to 4.2 mm ² / s, a viscosity index greater than 130, a weight percent Noack volatile content of less than 12, and a pour point of less than −9 ° C. Under conditions, an isomerized base oil is made from a process in which a highly paraffinic wax is hydroisomerized.

In one embodiment, the isomerized base oil has an aniline point greater than 200 at ° F and less than or equal to the amount defined by the formula: 36 × Ln (kinematic viscosity at 100 ° C. in mm ² / s) +200.

In one embodiment, the isomerized base oil has an autoignition temperature (AIT) that exceeds the AIT defined by the formula: AIT at ° C = 1.6 x (kinematic viscosity at 40 ° C at mm2 / s) + 300. . In a second embodiment, the base oil has an AIT greater than 329 ° C. and a viscosity index greater than 28 × Ln (kinematic viscosity at 100 ° C. at mm ² / s) +100.

In one embodiment, the isomerized base oil has a relatively low traction coefficient, in particular the traction coefficient is the formula: traction coefficient = 0.000 × Ln (kinematic viscosity in mm ² /s)−0.001 The kinematic viscosity is the kinematic viscosity during traction coefficient measurement and is between 2 and 50 mm ² / s. In one embodiment, the isomerized base oil has a traction coefficient of less than 0.023 (or less than 0.021) when the kinematic viscosity is measured at 15 mm ² / s and the ratio of slide to rotation is 40%. . In another embodiment, the isomerized base oil has a traction coefficient of less than 0.017 when measured at a kinematic viscosity of 15 mm ² / s and a ratio of slide to rotation of 40%. In another embodiment, the isomerized base oil has a viscosity index greater than 150 and a traction coefficient less than 0.015 when the kinematic viscosity is measured at 15 mm ² / s and the ratio of slide to rotation is 40%. Have.

  In some embodiments, isomerized base oils with low traction coefficients also exhibit higher kinematic viscosities and higher boiling points. In one embodiment, the base oil has a traction coefficient of less than 0.015 and a 50 wt% boiling point of greater than 565 ° C (1050 ° F). In other embodiments, the base oil has a traction coefficient less than 0.011, and a 50 wt% boiling point according to ASTM D6352-04 is greater than 582 ° C (1080 ° F).

  In some embodiments, an isomerized base oil having a low traction coefficient also has a branching index of 23.4 or lower, a branching proximity value of 22.0 or higher, and a free carbon index of 9 and 30. Shows unique branching characteristics by NMR, including between. In one embodiment, the base oil has at least 4 wt% naphthene carbon, and in another embodiment, at least 5 wt% by ndM analysis according to ASTM D3238-95 (2005 reapproved). Has naphthenic carbon.

In one embodiment, the intermediate oil isomer includes a paraffinic hydrocarbon component that is less than 7 alkyl branches per 100 carbon atoms, and the base oil has 8 alkyl moieties per 100 carbon atoms. Isomerized base oils are made in such a way as to include a paraffinic hydrocarbon component with a degree of branching below branch and less than 20% by weight of the alkyl branch being in position 2. In one embodiment, the FT base oil has a pour point of less than −8 ° C .; a kinematic viscosity at 100 ° C. of at least 3.2 mm ² / s; and a viscosity calculated by the formula: = 22 × Ln (kinematic viscosity at 100 ° C.) + 132. Has a viscosity index greater than the index.

  In one embodiment, the base oil comprises more than 10% by weight and less than 70% by weight of all molecules with cycloparaffinic functionality and greater than 15% by weight of molecules with multicycloparaffinic functionality. Having a ratio by weight% of molecules with cycloparaffinic functionality.

In one embodiment, the isomerized base oil has an average molecular weight between 600 and 1100, and an intramolecular average degree of branching between 6.5 and 10 alkyl branches per 100 carbon atoms. In another embodiment, the isomerized base oil has a kinematic viscosity between about 8 and about 25 mm ² / s and an intramolecular average degree of branching of between 6.5 and 10 alkyl branches per 100 carbon atoms. Have

In one embodiment, the isomerized base oil is obtained in a process where the ratio of hydrogen to feed is 712.4-3562 liters hydrogen / liter oil and the highly paraffinic wax is hydroisomerized, As a result, the base oil is more than 10% by weight of the molecules with monocycloparaffinic functionality relative to the total weight% of molecules with cycloparaffinic functionality and more than 15% by weight of molecules with multicycloparaffinic functionality. Have a ratio. In another embodiment, the base oil has a viscosity index that exceeds the amount defined by the formula: 28 × Ln (kinematic viscosity at 100 ° C.) + 95. In a third embodiment, the base oil has an aromatic weight percentage of less than 0.30; a weight percentage of molecules having cycloparaffinic functionality is greater than 10; a weight percentage of molecules having multicycloparaffinic functionality. The ratio by weight of molecules with monocycloparaffinic functional groups to>20; the viscosity index exceeds 28 × Ln (kinematic viscosity at 100 ° C.) + 110. In the fourth embodiment, the base oil further has a kinematic viscosity at 100 ° C. exceeding 6 mm ² / s. In a fifth embodiment, the base oil has an aromatic weight percentage of less than 0.05 and a 28 × Ln viscosity index greater than (kinematic viscosity at 100 ° C.) + 95. In a sixth embodiment, the base oil has an aromatic weight percentage of less than 0.30 and a weight percentage of molecules having cycloparaffinic functional groups of 3 times the kinematic viscosity at 100 ° C. at mm ² / s. And the ratio of molecules with monocycloparaffinic functional groups to molecules with multicycloparaffinic functional groups exceeds 15.

In one embodiment, the isomerized base oil contains between 2 and 10% naphthene carbon as measured by the ndM method. In one embodiment, the base oil has a kinematic viscosity at 100 ° C. of 1.5-3.0 mm ² / s and naphthenic carbon of 2-3%. In other embodiments, the kinematic viscosity is 1.8-3.5 mm ² / s at 100 ° C. and the naphthenic carbon is 2.5-4%. In a third embodiment, the kinematic viscosity is 3-6 mm ² / s at 100 ° C. and naphthenic carbon is 2.7-5%. In a fourth embodiment, the kinematic viscosity is 10-30 mm ² / s at 100 ° C., and the naphthenic carbon exceeds 5.2%.

  In one embodiment, the isomerized base oil has an average molecular weight greater than 475; a viscosity index greater than 140, and a weight percent olefin less than 10. The base oil improves the air bleed and low foaming properties of the mixture when incorporated into a sliding surface lubricant composition.

In one embodiment, the isomerized base oil is white oil, as disclosed in US Pat. No. 7,214,307 and US Patent Application Publication No. 2006/0016724. In one embodiment, the isomerized base oil has a kinematic viscosity at 100 ° C. of between about 1.5 centistokes (cSt) and 36 mm ² / s and the viscosity index is the formula: viscosity index = 28 × Ln (kinetic at 100 ° C. Viscosity) greater than the amount calculated by +95, the weight percentage of molecules with cycloparaffinic functionality is between 5 and less than 18, less than 1.2 weight% of molecules with multicycloparaffin functionality, less than 0 ° C. A white oil with a pour point and a Saybolt color of +20 or above.

  In one embodiment, the sliding surface lubricant composition uses a base oil comprising at least one or a mixture of the isomerized base oils described above. In other embodiments, the composition essentially comprises at least a Fischer-Tropsch base oil. In yet other embodiments, the sliding surface lubricant composition is present in an amount sufficient to still have the desired demulsibility performance, eg, the minimum time for the resulting emulsion to decrease to 3 ml or less. Along with the isomerized base oil, the composition comprises a sufficient amount of at least one isomerized base oil and 5 to 95% by weight of at least other types of oils, such as Group I, II, III, IV and V lubricant groups. Use a lubricating base oil selected from oils.

  Examples of base oils (in addition to isomerized base oils), depending on the application, include commonly used mineral oils, synthetic hydrocarbon oils or synthetic ester oils, or mixtures thereof. The mineral lubricating base stock can be any conventional refined base stock derived from paraffin, naphthene, and mixed base crude oil. Synthetic lubricating oils that may be used include glycol esters and complex esters. Other synthetic oils that can be used include synthetic hydrocarbons such as polyalphaolefins; alkylated bottoms from alkylation of benzene with alkylbenzenes such as tetrapropylene or copolymers of ethylene and propylene; silicone oils such as , Ethyl phenyl polysiloxane, methyl polysiloxane, etc .; polyglycol oils, for example, those obtained by condensation reaction of butyl alcohol with propylene oxide; Other suitable synthetic oils include polyphenyl ethers, such as those having 3-7 ether linkages and 4-8 phenyl groups. Other suitable synthetic oils include polyisobutenes and alkylated aromatics such as alkylated naphthalene.

In one embodiment, the base oil matrix of sliding surface lubricant, be between kinematic viscosity at 100 ° C. is ^{3mm 2} / ^s~5mm 2 / s; kinematic viscosity at 40 ° C. is 10mm ² / s~20mm ² / s The viscosity index is between 135 and 150; the CCS VIS is 1500-3500 mPa.s at -40 ° C. s, at −35 ° C., 1,000 to 2,000 mPa.s. the pour point is in the range of −20 to −30 ° C .; the molecular weight is in the range of 400 to 500; the density is in the range of 0.805 to 0.820; the paraffin carbon is 94 to 97%. Range: 3 to 6% naphthenic carbon; 35 to 50 hours oxydata BN; 18 to 28 bromine index; measured in accordance with ASTM D5800-05 Procedure B and expressed in weight percent FT base oil having a Noack volatile content of 10 to 20.

  Additional optional ingredients: The sliding surface lubricant composition of the present invention is characterized as having excellent demulsibility and requiring little or no demulsifier (demulsifier). However, in some embodiments and depending on the end use application, small amounts of demulsifiers may optionally be added in amounts ranging from 0.001 to 10.0% by weight. In one embodiment, less than 5% by weight of at least one demulsifier is added. In other embodiments, the loading is less than 1% by weight. In a fourth embodiment, the amount of demulsifier present is less than 0.5% by weight.

  Non-limiting examples of demulsifiers include polyoxyalkylene alcohols, oxyalkylated alcohols, fatty acids, aliphatic amines, glycols, alkylphenol-formaldehyde condensation compounds, alkylbenzene sulfonates, polyethylene oxide, polypropylene oxide, oil-soluble acid salts And esters, oxyalkylated trimethylolalkanes, oxyalkylated alkylphenol-formaldehyde condensation products, tetrapolyoxyalkylene derivatives of ethylenediamine, mixtures of alkylarylsulfonates, polyoxyalkylene glycols, oxyalkylated glycols, esters of oxyalkylated glycols Oxyalkylated alkylphenol resins, and ethylene oxide, propylene oxide, 1-2, and Or 2-3 polyoxyalkylene polyols derived from butylene oxide, as well as the mixtures thereof, but is not limited thereto.

  In one embodiment, the sliding surface lubricant may be other additives known in the art, such as high pressure agents, adhesion (tackiness) additives, friction modifiers, antioxidants (antioxidants), antiwear agents. , Metal passivating agents, antifoaming agents and the like may be included in amounts of 0.05 to 10% by weight to improve the properties of the composition.

  In one embodiment, such as a synthetic polymeric adhesive additive having an average molecular weight of at least 1,000,000 to help keep the lubricant composition on the surface of the bearing during operation of the guide table Adhesive additives are used. Examples include Spartanburg, S .; C. There is “ADDCO ADDTAC ™” available from Gateway Additives.

In the absence of some applications and extreme pressure additives, sliding surface lubricant films are more prone to tear when used at high pressures and / or elevated temperatures. In one embodiment, the extreme pressure additive is present in an amount of about 0.05 to about 5% by weight to prevent destructive metal-to-metal contact in lubricating the moving surface under high pressure and / or high temperature. It may be added to the lubricant composition. Examples of extreme pressure additives include sulfurized polyisobutylene, thienyl derivatives, trithiones, disulfides, trisulfides, hydrogen sulfide adducts of olefins, tetrasulfide derivatives of dimethylbenzyl tetrasulfide and _C18 hydrocarbons, _C18 fatty acids, and C Sulfurized synthetic compounds such as alkyl and triglyceride esters of ₁₈ fatty acids are included. In one embodiment, the extreme pressure additive has a molecular weight of at least about 200-500 g / mol and a boiling point of at least about 300 ° C., thereby ensuring that it remains in the lubricant composition and does not evaporate during use. The An example is di-t-dodecyl trisulfide.

  In one embodiment, the composition further comprises at least one friction modifier in an amount of 0.1 to 3% by weight to reduce friction, adhesion, and chatter between the bearing surface and the guide table surface. Including. In one embodiment, the friction modifier is a boronated glycerol monooleate ester. In other embodiments, the friction modifier is a polymeric synthetic ester having an average molecular weight of at least greater than about 200,000, such as a carboxylic acid ester; a monocarboxylic acid and glycerol ester; a dimer acid and a monovalent acid. Esters of alcohols; esters of glycerol and monocarboxylic acid fatty acids; esters of monocarboxylic acid fatty acids and polyhydric alcohols; and esters of dicarboxylic acids and polyhydric alcohols.

  In one embodiment, the composition comprises at least one of the aforementioned additives in the form of an additive package formulated for a sliding surface lubricant. An example is the additive package from The Elco Corporation of Cleveland, OH.

  Method of Making: The additives used to formulate the composition can be blended into the base oil matrix individually or in various subcombinations. In one embodiment, all of the components are blended simultaneously using an additive concentrate (ie, an additive and a diluent such as a hydrocarbon solvent). The use of additive concentrates can take advantage of the reciprocal compatibility obtained by combining the components when using the form of additive concentrates.

  In other embodiments, the composition is prepared by mixing the base oil and additive (s) at a suitable temperature, eg, 60 ° C., until uniform.

  Application: In one embodiment, the composition is used as a sliding surface lubricant to lubricate machine tool guides, planar bearings, slides and guides, for example, lubricate moving tracks of machine tools. Its main function is wear and corrosion protection, while at the same time reducing static and dynamic friction between the machine tool and the base. It can be used on all horizontal or vertical sliding surfaces where high quality demulsifying lubricants are required for sliding surface protection and to extend the service life.

  In one embodiment, the composition is particularly suitable for use in grinding processes, eliminating squeal, and protecting sliding surfaces from wear and corrosion. In other embodiments, the composition is used in applications where a combination of sliding surface and hydraulic fluid performance is required.

  Properties: The sliding surface lubricant composition of the present invention is characterized as having excellent demulsifying ability with little or no demulsifying additive. In one embodiment, the sliding surface lubricant composition has an excellent separation completion (ie, 3 ml or less) time at 54 ° C. of less than 60 minutes, as measured according to ASTM D-1401-2002. A sufficient amount of isomerized base oil is included for the composition to exhibit demulsibility. In a second embodiment, the sliding surface lubricant of the present invention exhibits complete separation at 54 ° C. in less than 45 minutes. In a third embodiment, the separation completion time is less than 30 minutes at 54 ° C. In a fourth embodiment, the separation completion time is less than 15 minutes at 54 ° C.

  In one embodiment, the sliding surface lubricant composition is measured at 82 ° C. for less than 60 minutes, as measured according to ASTM D-1401-2002, for an oil having a kinematic viscosity at 40 ° C. greater than 90 cSt. It contains an amount of isomerized base oil sufficient for the composition to exhibit excellent demulsibility with separation completion (ie, 3 ml or less) time. In a second embodiment, the sliding surface lubricant of the present invention exhibits a complete separation in less than 45 minutes at 82 ° C. for an oil having a kinematic viscosity at 40 ° C. greater than 90 cSt. In a third embodiment, for oils with a kinematic viscosity at 40 ° C. greater than 90 cSt, the separation completion time is 82 ° C. and less than 30 minutes. In a fourth embodiment, for oils having a kinematic viscosity at 40 ° C. greater than 90 cSt, the separation completion time is 82 ° C. and less than 15 minutes.

  In one embodiment, a sliding surface lubricant composition having a base oil matrix that essentially comprises an isomerized base oil, such as a Fischer-Tropsch derived base oil made from a waxy feed, is highly desirable at less than 1 ppm. Characterized as having low levels of sulfur. This therefore does not contribute to bacterial growth and odor development.

  In one embodiment, the composition includes, but is not limited to, P47, P50 and P53 Cincinnati Milacron specifications for grades 68, 220 and 32, including machine tools and compressed air tools. Meet the manufacturer's requirements.

In one embodiment, a sliding surface lubricant composition having a base oil matrix that essentially comprises an isomerized base oil, such as a Fischer-Tropsch derived base oil, is inherently biodegradable from> 30% to easily OECD 301D levels in the range of> 90% which are degradable. In one embodiment, a sliding surface lubricant composition having a base oil matrix with a kinematic viscosity at 40 ° C. <100 mm ² / s (H) exhibits about 30% OECD 301D biodegradability. In a second embodiment, a composition having a base oil matrix with a kinematic viscosity <40 mm ² / s (M) at 40 ° C. exhibits about 40% OECD 301D biodegradability. In a third embodiment, a composition having a base oil matrix with a kinematic viscosity at 40 ° C. of <8 mm ² / s (L) exhibits an OECD 301D biodegradability of ≧ 40%. In a fourth embodiment, a composition having a base oil matrix with a kinematic viscosity at 40 ° C. <11 mm ² / s exhibits about 80% OECD 301D biodegradability. In a fifth embodiment, a composition having a base oil matrix with a kinematic viscosity at 40 ° C. of <6 mm ² / s exhibits> 93% OECD 301D biodegradability.

In one embodiment, the sliding surface lubricant composition, kinematic viscosity The kinematic viscosity at 40 ° C. in the range of 10 to 250 mm ² / s, at 100 ° C. in the range of 6 to 20 mm ² / s, a viscosity in the range of 145 to 160 Index, COC flash point of at least 200 ° C, pour point in the range of -5 to -30 ° C.

  The following examples are given as non-limiting illustrations of aspects of the present invention. Unless otherwise stated, the components in the examples are as follows (shown in weight percent in Table 1):

  MGTL and HGTL are FTBO base oils from Chevron Corporation of San Ramon, CA. The properties of the FTBO base oil used in the examples are shown in Table 2.

  Ergon ™ Hygold 100 and Ergon ™ L2000 Pale Oil are available from Ergon Refining, Inc. Deuterated naphthenic distillate (Group V).

  Citgo ™ 325N and Citgo ™ 650n are highly refined neutral oils from Citgo Petroleum Corporation of Tulsa, OK.

  Star ™ 6 and Star ™ 12 are Group II base oils from Shell Lubricants.

  SynFuid ™ 8cSt and SynFluid ™ 40cST are available from Chevron Corp. From polyalphaolefin (PAO).

  Additive X is an inert sulfurized fatty acid ester and an extreme pressure lubricating additive available commercially from various sources.

The data in Table 1 shows an embodiment of the sliding surface lubricant composition of the present invention, where Example 5 has superior separation characteristics compared to the compositions of Examples 1-4 with prior art base oils. The water performance is measured (measured according to ASTM D1401-2002).

  For purposes of this specification and the appended claims, unless otherwise indicated, all numbers representing amounts, percentages or proportions and numerical values used in this specification and claims are: It should be understood that in all cases it is modified by the word “about”. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and the appended claims depend on the desired property sought to be obtained and / or the accuracy of the apparatus for measuring the value. It is an approximate value that may vary depending on it. Thus, it includes a standard deviation that is an error with respect to the device or method used to determine the value. Within the claims, the use of the term “or” clearly indicates that the disclosure only refers to the alternative, although the alternative supports only the alternative and the definition referring to “and / or”. Or the alternatives are used to mean the term “and / or” unless the alternative is mutually exclusive. The use of the word “a” or “an” means “one” when used in connection with the term “comprising” in the claims and / or specification. Can do. However, it is also consistent with the meaning of the terms “one or more”, “at least one” and “one or more than one”. Further, all ranges disclosed herein are inclusive and can be combined independently. In general, unless otherwise indicated, singular elements may be in the plural and vice versa without loss of generality. As used herein, the term “comprising” and grammatical variations thereof are intended to be non-limiting and, therefore, items listed are listed. It is not intended to exclude other similar items that can be replaced or added to other items.

  It is envisioned that any aspect of the invention discussed in the context of one embodiment of the invention may be implemented or applied with respect to any other embodiment of the invention. Similarly, any composition of the present invention can be the result of the present invention or used in any method or process. This written description uses examples to disclose the invention, including the best method, and to enable any person skilled in the art to make and use the invention. The scope of rights that may be granted is defined by the claims, and may include other examples that occur to those skilled in the art. Such other embodiments are claimed if they have structural elements that do not change from the language of the claims, or if they contain equivalent structural elements that have non-essential differences from the language of the claims. It is intended to be within the scope of the paragraph. All citations referred to herein are expressly incorporated herein by reference.

Claims (26)

a) a base oil comprising at least one isomerized base oil having a continuous number of carbon atoms and having a naphthene carbon content of less than 10% by weight according to the ndM method;
b) 0.001-10% by weight of additive package, antioxidant, high pressure agent, friction modifier, adhesive additive, antiwear agent, metal immobilizing agent, antifoaming agent, demulsifier, and these A sliding surface lubricant composition comprising at least one additive selected from a mixture comprising:
The sliding surface lubrication described above, wherein the lubricant composition comprises an amount of isomerized base oil, as measured according to ASTM D1401-2002, sufficient for the composition to separate from water at 54 ° C in less than 60 minutes Agent composition.   The composition of claim 1, wherein the demulsifier is present in an amount of less than 1% by weight.   The composition of claim 1 wherein the demulsifier is present in an amount of less than 0.5 wt%.   The composition of claim 1, which separates from water in less than 45 minutes at 54 ° C., as measured according to ASTM D-1401-2002.   The composition of claim 2, which is separated from water at 54 ° C in less than 30 minutes as measured according to ASTM D-1401-2002.   4. The composition of claim 3, which separates from water in less than 15 minutes at 54 [deg.] C., measured according to ASTM D-1401-2002.   The composition of claim 1, wherein the sufficient amount of isomerized base oil is 95-99.999 wt%.   The composition of claim 1, wherein the base oil further comprises at least one of at least one of mineral oils, alpha olefin oligomers, esters, synthetic hydrocarbon oils, and mixtures thereof.   The composition of claim 7, wherein the base oil comprises at least one of at least one of mineral oils, alpha olefin oligomers, esters, synthetic hydrocarbon oils, and mixtures thereof, in an amount of 5 to 95 wt%.   Isomerized base oils are made from a waxy feed having an average molecular weight between 600 and 1100 and an intramolecular average degree of branching of alkyl branches between 6.5 and 10 per 100 carbon atoms. The composition according to claim 1, which is a base oil derived from Fischer-Tropsch.   The composition of claim 1, satisfying at least one of the C47 Cincinnati Milacron specifications for grades 68, 220 and 32.   The composition of claim 1, wherein the isomerized base oil has a Noack volatile content between 0 and 100 by weight. The composition of claim 1, wherein the isomerized base oil has an auto-ignition temperature (AIT) that exceeds an amount defined by 1.6 × (kinematic viscosity at 40 ° C. at mm ² / s) +300.   The composition of claim 1, wherein the isomerized base oil has an auto-ignition temperature (AIT) of greater than 329 ° C. and a Noack volatile content of less than that defined by 160-40 (kinematic viscosity at 100 ° C.). The composition of claim 1, wherein the isomerized base oil has a viscosity index greater than 28 × Ln (kinematic viscosity at 100 ° C. in mm ² / s) +300.   The composition of claim 1, wherein the isomerized base oil has a ratio of the weight percent of molecules with monocycloparaffinic functional groups to the weight percent of molecules with multicycloparaffinic functional groups of greater than 15.   Process in which highly paraffinic wax is hydroisomerized under conditions of about 600 ° F. to 750 ° F. using isomerized base oils with shape selective intermediate pore size molecular sieves containing dilute metal hydrogenation components The composition of claim 1, wherein the isomerized base oil has a Noack volatile content of less than 50% by weight.   The composition according to claim 1, wherein the isomerized base oil has a viscosity index exceeding an amount defined by 28 × Ln (kinematic viscosity at 100 ° C.) + 95. The isomerized base oil has a kinematic viscosity at 100 ° C.> 1.808 mm ² / s and a Noack volatile content less than the amount calculated by 1.286 + 20 (kv100) ^−1.5 + 551.8e ^−kv100 ( In the formula, kv100 is a kinematic viscosity at 100 ° C.), the composition according to claim 1.   The composition of claim 1, wherein the isomerized base oil comprises more than 3% by weight of molecules having cycloparaffinic functional groups and less than 0.30% by weight of aromatics.   The composition of claim 1, wherein the isomerized base oil comprises all molecules having greater than 10 wt% and less than 70 wt% cycloparaffinic functionality. The composition of claim 1, wherein the isomerized base oil has a traction coefficient of less than 0.023 when measured at a kinematic viscosity of 15 mm ² / s and a slip to roll ratio of 40%.   54. A method for demulsifying a sliding surface lubricant to a base oil typically used to prepare a sliding surface lubricant, measured according to ASTM D-1401-2002, Adding an amount of isomerized base oil sufficient to allow the lubricant to separate from water in less than 60 minutes, wherein the isomerized base oil has a continuous number of carbon atoms, nd The above method, wherein the naphthene carbon is less than 10% by weight according to the M method.   27. The method of claim 26, wherein the base oil typically used to prepare the sliding surface lubricant is a Group I, Group II, Group III, or Group IV base oil.   A method for de-emulsifying a sliding surface lubricant, measured in accordance with ASTM D-1401-2002, in an amount sufficient to allow the lubricant to separate from water at 54 ° C. in less than 60 minutes. A step of preparing a base oil comprising a chemicalized base oil, wherein the isomerized base oil has a continuous number of carbon atoms, and the naphthene carbon is less than 10 wt% by the ndM method, The above method.   0.001-10 wt% additive package, antioxidant, high pressure agent, friction modifier, adhesive additive, anti-wear agent, metal passivator, antifoaming agent, demulsifier in base oil 27. The method of claim 26, further comprising blending at least one additive selected from, and mixtures thereof.