EP4232533A1 - Lubrifiant biodégradable présentant une stabilité hydrolytique adaptée et une stabilité thermique améliorée par le biais d'une alkoxylation de glycérol - Google Patents

Lubrifiant biodégradable présentant une stabilité hydrolytique adaptée et une stabilité thermique améliorée par le biais d'une alkoxylation de glycérol

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Publication number
EP4232533A1
EP4232533A1 EP20838706.8A EP20838706A EP4232533A1 EP 4232533 A1 EP4232533 A1 EP 4232533A1 EP 20838706 A EP20838706 A EP 20838706A EP 4232533 A1 EP4232533 A1 EP 4232533A1
Authority
EP
European Patent Office
Prior art keywords
ester
base oil
glycerol
lubricating base
fatty acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20838706.8A
Other languages
German (de)
English (en)
Inventor
Zachary J. Hunt
Benjamin F. Bergmann
Monika Mujkic
Jeffrey R. Dimaio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tetramer Technologies LLC
Original Assignee
Tetramer Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetramer Technologies LLC filed Critical Tetramer Technologies LLC
Publication of EP4232533A1 publication Critical patent/EP4232533A1/fr
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/38—Esters of polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
    • C10M107/34—Polyoxyalkylenes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C10M2207/2825—Esters of (cyclo)aliphatic oolycarboxylic acids used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C10M2207/2835—Esters of polyhydroxy compounds used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/287—Partial esters
    • C10M2207/289—Partial esters containing free hydroxy groups
    • C10M2207/2895—Partial esters containing free hydroxy groups used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
    • C10M2209/1045—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
    • C10M2209/1055—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/04—Molecular weight; Molecular weight distribution
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/081—Biodegradable compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/08—Resistance to extreme temperature
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/66—Hydrolytic stability

Definitions

  • the subject matter disclosed herein is generally directed to methods of stabilizing the beta hydrogen adjacent to the ester bond(s) of a glycerol derivative by insertion of alkoxy groups to significantly improve the hydrolytic and thermal stability of the ester bonds, and it allows for control of the molar density of ester bonds in the lubricant to maximize hydrolytic stability while maintaining biodegradability and further improving performance properties.
  • U.S. Patent No. 3,337,595 discloses the making of fatty acid esters of propoxylated glycerol for use as defoaming aids.
  • the preferred embodi ment of the art is diesters of propoxylated glycerol and blends of said diesters with fatty acid methyl esters and esters of polyethylene glycol.
  • U.S. Patent No. 3,530,070 discloses the use of propoxylated polyols as synthetic lubricants.
  • the compositional space encompasses multiple polyols (trimethylol propane, neopentyl glycol,
  • SUBSTITUTE SHEET (RULE 26) pentaerythritol, dipentaerythritol, sorbitol, and glycerol) propoxylated up to an average of 72 PO units per mole of polyol and esterified to various fatty acids ( ⁇ C12).
  • This patent space encompasses materials that are low in biocontent ( ⁇ 40%) or low in biodegradation.
  • U.S. Patent No. 4,031,118 is concerned with ester containing processes and compositions as detergents and dispersants in fuels and lubricants.
  • the compositions disclosed are high MW (1000-10000 g/mol) polyether polyols (EO/PO copolymers) esterified with very long chain ( ⁇ C30) fatty acids.
  • This patent space encompasses materials with low to negligible biobased carbon content and low biodegradability.
  • U.S. Patent No. 5,916,854 discloses the use and composition of interesterified and alkoxy lated lubricating oils.
  • the compositions are product by process entailing the interesterification of natural oils with glycerol or free fatty acids with simultaneous alkoxylation.
  • the resultant products are a blend of many different- compositions including monoesters, diesters, and linear esters.
  • PCT WO 1995002659 discloses lubricating oil compositions for use as hydraulic fluids. Two processes are used to generate the claimed compositions: o Propoxylation of glycerol to an average of ⁇ 3 PO units per glycerol with preferred embodiments of 1 PO unit per glycerol followed by esterification with FA from C6-C24. o One pot process like that listed under U.S. Patent No. 5,916,854 creating product by process.
  • PCT W02012134792 discloses a lubricant composition comprising polymers of glycerol that have been propoxylated to an average of 6-15 PO units followed by esterification with FA from C8-C15.
  • Preferred claims are alkoxylates (PO 8-12) and FA esters (C9-11) of diglycerol and triglycerol.
  • PCT WO2014.124698 concerns the composition and use of pentaerythritol derived ester lubricants.
  • the preferred composition claimed and described consists of pentaerythritol with an average degree of propoxylation of 5 subsequently esterified with C8/C10 fatty acids or oleic acid.
  • High-temperature oxidative stability of a lubricant molecule depends heavily on the amount and configuration of hydrogen on the beta-carbons to an ester. Additionally, natural esters that have pour points suitable for industrial lubricants contain significant unsaturation and are prone to oxidative breakdown leading to the formation of varnish and, in some cases, gelation of the oil, which reduces flow and can potentially lead to mechanical failure. Partially and fully saturated natural esters, while oxidatively stable, have poor cold temperature properties and are prone to crystallization. Because of these limitations, natural esters are only used in applications such as total loss lubricants for environmentally sensitive areas.
  • EAL Environmentally Acceptable Lubricants
  • a synthetic ester lubricating base oil may include an ester of an alkoxylated glycerol with an average degree of alkoxylation ⁇ 3, and at least one fatty acid having ⁇ 8 carbon atoms.
  • the synthetic lubricating base oil exhibits, as compared to a glycerol ester with same fatty acid composition: increased oxidative, thermal and hydrolytic stability, decreased melting enthalpy, and decreased undercooling and has a single crystal melt point or an amorphous phase for each fraction of the synthetic lubricating base oil.
  • thermal oxidative stability of the synthetic ester lubricating base oil may be increased by greater than 25%, more preferable greater than 40%, and more preferably by greater than 60%, as determined by Rotating Pressure Vessel Oxidation Test (RPVOT) lifetime, compared to a glycerol ester of the same fatty acid composition.
  • hydrolytic stability of the base oil may be improved as measured by the reduction of the total acid value number by greater than 50%, more preferable greater than 60%, and more preferably greater than 70%.
  • melting enthalpy may be decreased relative to a glycerol ester with same fatty acid composition by over 50%, more preferable
  • SUBSTITUTE SHEET 60%, more preferably 70%, and even more preferably 80%.
  • melting enthalpy may be decreased such that the lubricant does not exhibit a detectable cloud point and maintains transparency.
  • undercooling may be decreased by greater than 30%, preferably greater than 50%, more preferably greater than 70% decrease, and even more preferably greater than 75%,
  • the alkoxylate may be derived from ethylene oxide (EO), propylene oxide (PO), butylene oxide (BO), or a combination thereof.
  • the alkoxylated glycerol may preferably have a range from 3 to 20 propoxy groups per molecule, more preferable a range of 5 to 12, more preferable yet, is a range of 8 to 11, and even more preferable is a degree of propoxy lation of 10.
  • at least one fatty acid may be a dicarboxylic acid.
  • the dicarboxylic acid may comprise oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, axelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, octadecanedioic acid or combinations of the above.
  • At least one fatty acid may be a functionalized acid.
  • the functionalized acid may comprise 12- hydroxystearic acid.
  • functionalization may comprise epoxidation, malei nation, metathesis, amidation, halogenation, hydration, hydrogenation, estolide formation, hydroformylation, dimerization, or vulcanization of the synthetic ester.
  • at least one fatty acid may be branched.
  • the branched acid may comprise 2 -ethylhexanoic acid or isost-earic acid.
  • the lubricating base oil may not be less than 40 percent biodegradable in the 10- day window of OECD 301 B test.
  • the lubricating base oil may be at least 25 percent biobased carbon.
  • the disclosure provides a synthetic lubricant including the synthetic ester lubricating base oil that may incorporate at least one additive selected from an antioxidant, an anti -wear agent, an anticorrosion agent, an anti-sludge agent, an anti -foam agent, a demulsifier, a viscosity index improver agent, a detergent/dispersant, a pour-point depressant, an alkalinity improver, a friction modifier, a seal swell agent, a metal deactivator/complexing agent, and/or an extreme pressure agent.
  • thermal oxidative stability as determined by RPOVT lifetime, may be greater than 600 minutes, more preferably greater than 800 minutes, and even more preferably greater than 1000 minutes,
  • the current disclosure provides the synthetic ester lubricating base oil as a hydrolytically stable, biodegradable lubricant.
  • the alkoxylated glycerol ester possesses hydrolytic stability and biodegradation by tailoring ester bond stability and ester density through use of’ alkoxy la tion wherein degradation products of the alkoxylated glycerol ester are nontoxic.
  • ISO viscosity grades of the lubricant may be from 32-150, more preferably 46-100, and even more preferably 46-68.
  • the current disclosure also provides a method of stabilizing betahydrogen of a glycerol ester and diluting molar density of the esters bond in an ester base oil wherein hydroxyl groups of the glycerol are alkoxylated with ethylene oxide, propylene oxide, butylene oxide, or a combination thereof, to form an alkoxylated glycerol ester with thermal, oxidative, and hydrolytic stability.
  • Figure 1 shows a schematic representation of glycerol (left) and alkoxylated glycerol (right) esters, highlighting the a and ⁇ hydrogens of each species and the primary and secondary alcohols.
  • Figure 3 shows Table 2: 1H NMR Shifts for Methylene and Methine Protons of Natural and Synthetic Ester Backbone.
  • Figure 4 shows Table 3: RPVOT Data for Neat and Formulated Base Oils.
  • Figure 6 shows Table 5: Thermodynamic Data for C12 Esters Analyzed by Differential Scanning Calorimetry.
  • Figure 7 shows Table 6: Undercool and Melt Enthalpy of Analogous Glycerol, TMP, and Propoxylated Glycerol Esters.
  • Figure 8 shows Table 7: Cold Temperature Behavior of Various Esters.
  • Figure 9 shows Table 8: PG 10- Whole Cut Fatty Acid Esters.
  • Figure 10 shows Table 9: Biodegradation According to OECD-301 B.
  • Figure 11 shows Table 10: Percent Biobased Carbon (ASTM Method D6866-20).
  • Figure 12 shows Table 11: PG 10 Branched, Functional, and Di acid Esters.
  • Figure 13 shows Table 12: Formulated Oil Performance Comparison.
  • Figure 14 shows Table 13: Examples of Ethoxylated Glycerol Esters.
  • a further embodiment includes from the one particular value and/or to the other particular value.
  • the recitation of numerical ranges by endpoints includes all numbers and fractions subsumed within the respective ranges, as well as the recited endpoints.
  • a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit unless the context clearly dictates otherwise, between the upper and lower limit of that range and any other stated or intervening value in that stated range, is encompassed within the disclosure.
  • the upper and lower limits of these smaller ranges may independently be included in the smaller ranges and are also encompassed within the disclosure, subject, to any specifically excluded
  • SUBSTITUTE SHEET (RULE 26) limit in the stated range.
  • ranges excluding either or both of those included limits are also included in the disclosure.
  • ranges excluding either or both of those included limits are also included in the disclosure, e.g. the phrase “x to y” includes the range from *x’ to ‘y’ as well as the range greater than ' x’ and less than y.
  • the range can also be expressed as an upper limit, e.g.
  • ratios, concentrations, amounts, and other numerical data can be expressed herein in a range format. It will be further understood that the endpoin ts of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint. It is also understood that there are a number of values disclosed herein, and that each value is also herein disclosed as “about” that particular value in addition to the value itself. For example, if the value “10” is disclosed, then “about 10” is also disclosed. Ranges can be expressed herein as from “about” one particular value, and/or to “about” another particular value. Similarly, when values are expressed as approximations, by use of the antecedent, “about,” it. will be understood that the particular value forms a further aspect. For example, if the value “about 1.0” is disclosed, then “10” is also disclosed.
  • SUBSTITUTE SHEET (RULE 26) the explicitly recited values of about 0.1% to about 5%, but also include individual values (e.g., about 1%, about 2%, about 3%. and about 4%) and the sub-ranges (e.g., about 0.5% to about 1.1%; about 0.5% to about 2.4%; about 0.5% to about 3.2%, and about 0.5% to about 4.4%, and other possible sub-ranges) within the indicated range.
  • a measurable variable such as a parameter, an amount, a temporal duration, and the like
  • a measurable variable such as a parameter, an amount, a temporal duration, and the like
  • variations of and from the specified value including those within experi mental error (which can be determined by e.g. given data set, art accepted standard, and/or with e.g. a given confidence interval (e.g. 90%, 95%, or more confidence interval from the mean), such as variations of +/- 10% or less, +/5% or less, +/-1 % or less, and +/- 0.1% or less of and from the specified value, insofar such variations are appropriate to perform in the disclosed disclosure.
  • a given confidence interval e.g. 90%, 95%, or more confidence interval from the mean
  • the terms “about,” “approximate,” “at or about,” and “substantially” can mean that the amount or value in question can be the exact value or a value that provides equivalent results or effects as recited in the claims or taught herein. That is, it is understood that amounts, sizes, formulations, parameters, and other quantities and characteristics are not and need not be exact, hut may be approximate and/or larger or smaller, as desired, reflecting tolerances, conversion factors, rounding off, measurement error and the like, and other factors known to those of skill in the art such that equivalent results or effects are obtained. In some circumstances, the value that provides equivalent results or effects cannot be reasonably determined.
  • an amount, size, formulation, parameter or other quantity or characteristic is “about,” “approximate,” or “at or about” whether or not expressly stated to be such. It is understood that where "about,” “approximate,” or “at or about” is used before a quantitative value, the parameter also includes the specific quantitative value itself, unless specifically stated otherwise.
  • molecular weight can generally refer to the mass or average mass of a mole of a material.
  • a mole is a defined number of molecules (Avogadro constant). If a polymer or oligomer, the molecular weight can refer to the relative average chain length or relative chain mass of the bulk polymer.
  • the molecular weight of polymers and oligomers can be estimated or characterized in various ways including gel permeation chromatography (GPC) or capillary viscometry. GPC molecular weights are reported as the weight-average molecular weight (Mw) as opposed to the number ⁇ average molecular weight (M n ).
  • Capillary viscometry provides estimates of molecular weight as the inherent viscosity determined from a dilute polymer solution using a particular set of concentration, temperature, and solvent conditions.
  • weight percent As used herein, the terms “weight percent,” “wt%,” and “wt. % ” which can be used interchangeably, i ndicate the percent by weight of a given component based on the total weight of a composition of which it is a component, unless otherwise specified. That is, unless otherwise specified, all wt% values are based on the total weight of the composition. It should be understood that the sum of wt% values for all components in a disclosed composition or formulation are equal to 100. Alternatively, if the wt% value is based on the total weight of a subset of components in a composition, it should be understood that the sum of wt% values of the specified components in the disclosed composition or formulation are equal to 100.
  • ester refers to a type of chemical bond or, alternatively, to a type of molecule which is composed of ester bonds.
  • alkoxylated glycerol ester As in “alkoxylated glycerol ester,” “propoxy lated glycerol ester,” “glycerol ester,” “TMP ester,” and “synthetic ester,” it should be understood that the fully esterified ester variants of the molecule are being 11 SU BSTITUTE SH EET (RULE 26) described.
  • oil chemistry it is not unusual to have a monoacylglyceride or diacylglyceride which are estere but are not. equivalent to a triacylglyceride.
  • a fully esterified ester is understood to be when a hydroxyl value of less than 15 mg KOH/g is achieved, or more preferably less than 10 mg KOH/g, or most preferably less than 5 mg KOH/g.
  • EO, PO, and BO may be used to describe the alkylene oxide reactants, ethylene oxide, propylene oxide, and butylene oxide, respectively, or EO, PO, and BO may be used to describe the polyether composition, ethoxy, propoxy, and butoxy, respectively, of the alkoxylated glycerol.
  • propoxylating and oxypropylating are used synonymously, as well propoxylated and oxypropoxylaled.
  • ethoxylating and oxyethylating are used synonymously, as well ethoxylated and oxyethylated.
  • degree of aikoxylation herein should be taken to mean the average number of alkylene oxide molecules (EO, PO, and/or BO) that have been attached to a given polyol molecule.
  • EO alkylene oxide molecules
  • PO polypropylene oxide
  • BO alkylene oxide molecules
  • Patent 6,495,188 B2 it is found that a stoichiometric ratio degree of aikoxylation, e.g. 3 PO per glycerol, results in approximately 63% of the glycerol hydroxyl groups being reacted. A degree of aikoxylation of 4 resulted in 82% of free glycerol hydroxyl groups being alkoxylated, and a degree of aikoxylation of 5 resulted in complete aikoxylation.
  • a stoichiometric ratio degree of aikoxylation e.g. 3 PO per glycerol
  • “Insertion” as used herein should be taken to mean putting the alkoxy groups in the molecular structure but not to mean insertion in the chemistry sense of a reaction mechanism.
  • SUBSTITUTE SHEET (RULE 26) conjunction with a particular embodiment is not necessarily limited to that embodiment and can be practiced with any other embodiment(s).
  • Reference throughout this specification to "one embodiment”, “an embodiment,* “an example embodiment,” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure.
  • appearances of the phrases “in one embodiment,” “in an embodiment,” or “an example embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment but may.
  • the particular features, structures or characteristics may be combined in any suitable manner, as would be apparent to a person skilled in the art from this disclosure, in one or more embodiments.
  • some embodiments described herein include some, but not other features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the disclosure.
  • any of the claimed embodiments can be used in any combination.
  • alkoxylated glycerol as a polyol for synthetic esters.
  • Fatty acids ⁇ C8 and alkoxylated glycerols with a degree of alkoxylation ⁇ 3 are used to control the biobased content and biodegradation of the resultant synthetic ester.
  • tailoring the fatty acid and alkoxylated glycerol composition is found to allow for tailoring the hydrolytic and thermo-oxidative stability of the alkoxylated glycerol ester.
  • the present disclosure describes a method of modification and composition(s) of glycerol esters wherein the glycerol is alkoxylated and esterified to enhance oxidative, thermal, and hydrolytic stability compared to the unmodified glyceride while possessing pour points and viscosity indices required of lubricating oils in general. Further, the authors have found the performance of the formulated propoxylated glycerol ester base oils to exhibit lubricant properties superior to comparable commercial formulated base oils, see FIG. 1.3, Table 12, especially when compared to environmentally acceptable base oils. Base oils are used to manufacture products including hydraulic fluids, turbine oils, compressor fluids, lubricating greases, motor oils and metal processing fluids. Synthetic ester, including alkoxylated glycerol ester, lubricating oil compositions may comprise other conventional oil additives in the formulated lubricant.
  • esters will possess enhanced stability compared to esters of glycerol due to substantial coverage of the primary hydroxyl groups of the glycerol. Further it is expected that esters with a degree of alkoxylation ⁇ 5 will have an enhanced stability relative to esters with a degree of alkoxylation ⁇ 3. The enhanced stability of an ester when the degree of alkoxylation is ⁇ 5 is due to the complete coverage of the glycerol hydroxyl groups. When all glycerol hydroxyls are alkoxylated, the subsequent ester bonds will have only ⁇ methylene protons, whereas partial reaction of the glycerol hydroxyls allows for the occurrence of 8 methine protons.
  • the polyether spacers In addition to stabilizing the methine proton (on the secondary carbon) of the glycerol, the polyether spacers also physically separate and isolate the ester bonds away from the glycerol. This limits the formation of the transition state six- membered ring with the methine group of the glycerol that is understood to enable the thermal degradation of triglyceride oils (glycerol esters). [Rudnick, L. R. (ed.). (2020). Synthetics, Mineral Oils, and Bio- Based Lubricants (pp. 60). CRC Press] The instability of the beta-hydrogen in glycerol esters due to the adjacent ester groups has been resolved by inserting the stabilizing polyether spacers. The new beta-positioned hydrogen atoms are located on the ester-adjacent alkoxy groups surrounded by stabilizing ether groups.
  • the alkoxylated glycerol ester is significantly more stable than the glycerol ester because the hydroxyl groups of propoxy and butoxy groups are all secondary alcohols compared to the 2 primary and 1 secondary hydroxyl groups on the glycerol. It is well known that secondary hydroxyl groups produce a
  • SUBSTITUTE SHEET (RULE 26) more stable ester bond compared to an ester of a primary hydroxyl group. This can be attributed to the strain induced on the carbon backbone which helps to inhibit the formation of the transition state six-membered ring that enables the thermal decomposition of esters. Esterification of an alkoxylated glycerol which is terminated with a propoxy or butoxy group creates a more sterically hindered and electronically stable secondary ester bonds compared to glycerol esters. It should be noted that an ethoxylated glycerol ester will have primary esters but may still exhibit greater stability than the analogue glycerol ester.
  • the beta-hydrogens of the alkoxylated glycerol ester are methylene hydrogens. It is known to those skilled in the art that hydrogen bond stability decreases in order of methyl>methylene>methine.
  • the classic "beta- hydrogen argument” against glycerol backbone chemistry in a base oil is the result of a primary ester abstracting a methine hydrogen of’ the beta-carbon.
  • the propoxylated glycerol ester has a degradation mechanism that is based on a secondary ester abstracting a methylene hydrogen of the beta -carbon, now located at the terminal propoxy unit.
  • the resulting propoxylated glycerol ester oil(s) of this disclosure comprises a stabilizing polyether spacer (polyalkoxy) between the glycerol and fatty acid(s) of’ a triglyceride oil.
  • a method for controlling the thermal, oxidative, and hydrolytic stability of an alkoxylated glycerol ester is found in increasing the molecular weight of the alkoxy groups thereby reducing the overall molar density of ester bonds in the alkoxylated glycerol ester compared to the glycerol ester.
  • the ester bond tends to be the weak link in the degradation of a synthetic ester, the thermal, oxidative, and hydrolytic stability are improved when the number of ester bonds is decreased.
  • Oxidative stability for commercial and industrial materials is often conducted according to the Rotating Pressure Vessel Oxidation Test (RPVOT) as specified in ASTM D2272.
  • the RPVOT results can be used to compare relative stability of base oils in the presence of water, oxygen, catalyst., and heat.
  • RPVOT was performed to evaluate the thermo-oxidative stability of glycerol ester and
  • SUBSTITUTE SHEET (RULE 26) propoxylated glycerol ester base oils. In this test, longer lifetimes equate to more stable base oils and oil formulations.
  • FIG. 4. Table 3 compares the RPVOT data of two natural glycerol esters, one trim ethylol propane (TMP) ester, and two propoxylated glycerol esters without any additives to enhance performance. This data confirms that an increase of greater than 60% can be observed in the overall stability of the propoxylated glycerol esters (both saturated and unsaturated) when compared to glycerol esters. The TMP ester, despite its lack of a beta-proton, performs relatively poorly in this test.
  • propoxylated glycerol esters were found to have RPVOT lifetimes in the same order of commercial petroleum-based turbine oils, see FIG. 13, Table 12.
  • the propoxylated glycerol ester turbine lubricant was shown to have between a 375% and a 1000% increase in lifetime. Further, it is shown in Table 12 that the propoxylated glycerol ester turbine lubricant has a superior Oxidative Onset Temperature (OOT), as measured by ASTM E2009-08, compared to the Chevron GST.
  • OOT Oxidative Onset Temperature
  • TMP trioleates are shown in literature to have OOT of 156 °C and after formulation, up to 206 °C [Wu, Y crayon et al; Thermochimica Acta, 569, 2013, pp. 112-118]. While this high level of thermal and oxidative performance for the alkoxylated glycerol is surprising, it should be noted that it is possible for a biodegradable base oil to be too stable, specifically with respect to hydrolytic stability.
  • SUBSTITUTE SHEET (RULE 26) least 60% degradation within the 10-day window which starts once 10% degradation is observed.
  • the most optimized hydrolytically stable biodegradable base oils would show a degradation at or just greater than 60% on day 10 of the window.
  • Table 9 shows an example with an optimized ester density. It is expected that the base oil of the present invention will meet or exceed the thresholds of other common biodegradation tests
  • Table 4 shows the excellent performance of the propoxylated glycerol esters with regard to their hydrolytic stability. It is worth noting that the performance of the alkoxy] ated glycerol esters outperforms that of unsaturated polyol esters in hydrolytic stability.
  • the unsaturated polyol esters are known to have similar hydrolytic performance to unsaturated glycerol esters [Fuels and Lubricants Handbook, 2 nd ed., p. 560] . While it is not fully understood why the propoxylated glycerol esters have such a significant improvement in hydrolytic stability, it is clear from the performance that there is a novel effect.
  • the saturated propoxylated glycerol esters (Ex. 91 and 103) are 7 to 10 times lower than the saturated glycerol ester (Ex. 92) and the saturated TMP ester (Ex. 90). Further, the Total AV number of the Ex. 103 and 91 were 4 to 7 times lower than the glycerol ester and the TMP ester. An explanation may be found in the alkoxy group itself.
  • US Patent application 20170240833 teaches that polyalkylene glycols are known to improve hydrolytic stability when blended with other base oils and references US Patent Application 20140107004AI which teaches that blending a triblock polyalkylene glycol at about 10% with vegetable oil or synthetic esters can greatly improve the hydrolytic stability. It is proposed that the increase in hydrolytic stability may be related to latent water, that is water bound by hydrogen bon ds to the ether bonds, which is not free to participate in hydrolysis until saturation of the oil is achieved. If this proposed mechanism is correct, it would be just one additional contributing factor to the overall thermo- oxidative and hydrolytic stability.
  • thermodynamic properties of a given base oil can be thoroughly examined using DSC in addition to traditional qualification testing (e.g. cloud point and pour point).
  • DSC traditional qualification testing
  • the pour point modified ASTM D97
  • cloud point modified ASTM D2500
  • onset of crystallization DSC
  • the oil will gel or freeze. If two oils have similar pour points, an oil with a lower melt enthalpy and a reduced degree of undercooling will recover to a fluid state at a lower temperature and in less time compared to the oil with a higher enthalpy and greater undercooling.
  • SUBSTITUTE SHEET (RULE 26) alkoxylated glycerols, when compared to natural esters and neopentyl polyol esters, were found to exhibit reduced enthalpy and undercooling which resulted in faster melting behavior. Representative comparisons of natural esters, neopentyl polyol esters, and alkoxylated esters are described in the examples of the present disclosure.
  • ASTM required equipment for ASTM D97 and ASTM D2500 were modified as follows: Cold baths were prepared in cylindrical stainless-steel thermoses (dimensions 70mm x 110mm) and filled with isopropyl alcohol. Bath temperatures, as described by the ASTM, were reached and maintained through manual addition of dry ice. To serve as the cooling jacket, a test tube (25 x 150 mm; OD x length) with a 25x25 mm piece of fabric cushion placed at the bottom was set to cool in the IPA/CO 2 (s) baths. 8 ml of the specimen was charged in a sample tube (15 x 150 mm; OD x length).
  • thermometer down to -1.00 °C
  • a rubber stopper one-hole stopper with a tight fit on thermometer
  • esters of alkoxylated glycerols utilizing DSC Natural esters and esters of neopentyl polyols tend to show exothermic events near their melt transitions indicating the formation of a more stable and higher melting crystalline solid.
  • Oils which exhibit multiple melt phase transitions can also suffer from the growth of high stability crystal phases when the oil is thermally cycled close to the onset of crystallization. This well-known phenomenon occurs due to the increased thermal stability of the high melting crystal phase particles, which remain after partial melting (the particles serve as seed crystals).
  • Oils with a lower undercooling require a smaller increase in temperature after crystallization to melt the oil and erase the oil “memory.”
  • Shelby and Miller teach the concept of oil ‘'memory” as a result of gels or crystals not fullj ?
  • SUBSTITUTE SHEET (RULE 26) dissociating even when above the melt point, so that on a second cooling cycle, gelation or crystal growth occurs much more quickly and at higher temperatures. If two oils have the same crystallization onset temperature, the oil with the lower undercooling will fully melt at a lower temperature and erase the oil “memory”. While propoxylated glycerol esters have undercooling values on the order of 10 °C, triglycerides exhibit a degree of undercooling on the order of 20-40 °C. The effect of this is that glycerol esters and polyol esters must be heated substantially above the onset of crystallization in order to melt the oil before use. See. Selby. T.
  • Blown oils are drying oils which have been modified through an oxidative process at elevated temperatures and are manufactured to a specific viscosity specification ranging from 1 poise @ 25 °C up to 1600 poise @ 25 °C, depending on the oil type.
  • the oxidation process leads to chemically modified products containing polymerized triglyceride esters incorporating additional combined oxygen. Peroxide, hydroperoxide and hydroxyl groups are also present.
  • the oxidation process also modifies properties such, as specific gravity, solubility, and reactivity.
  • the blown, stripped oil blend can be used for end-use applications that require or take advantage of oils having high flash point and increased viscosity.
  • the blown, stripped oil blends are particularly suitable for de ⁇ dusting fluids.
  • Blown oils also find uses in many lubricant- applications including cutting fluids, rolling and metal working oils, drilling muds, two stroke engine oils, greases, wire drawing, and chainsaw lubricants. Blown oils degrade slower than petroleum based mineral oils having lower flash points.
  • the current disclosure in one aspect, provides a synthetic lubricating base oil.
  • the base oil may include an ester of an al'koxylated glycerol with an average degree of alkoxylation ⁇ 3, such as greater than or equal to 4, 5, 6, 7, 8, 9, 10, etc. and at least one fatty acid having ⁇ 8 carbon atoms, such as greater than or equal to 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, etc, wherein the melting enthalpy has been significantly decreased and the undercooling has been decreased.
  • the melt enthalpy for propoxylated glycerol esters with an average degree of alkoxylation ⁇ 3 has been reduced by >50% relative to the triglyceride with the similar fatty acid composition, see Table 5.
  • propoxylated glycerol esters which have fatty acid compositions with higher levels of low melt point fatty acids, such as oleic, linoleic, capric, and caprylic acid, and levels of propoxylation greater than 3, more preferably greater than 5, and even more preferably 10 or greater, that the enthalpy of the lubricant is reduced to the point that there is no visual observation of crystallization. In these samples, no cloud point was recorded, and transparency remained well below -50 °C.
  • By decreasing the level of propoxylation, ex. from 10 to 5, or decreasing the relative concentration of the low melt point fatty acids which comprise the propoxylated glycerol ester transparent samples were observed to transition to translucent samples. This can be observed in FIG. 8, Table 7. In addition to full propoxylated examples, it was observed that some alkoxylated samples, which were propoxylated and capped with an ethoxy group before esterification were also translucent. It should be noted that when the
  • the undercooling for propoxylated glycerol esters with an average degree of alkoxylation ⁇ 3 has been reduced by more than 15 °C relative to the triglyceride with similar fatty acid composition, see FIG. 7, Table 6.
  • the degree of propoxylation is approximately 10
  • the degree of undercooling may be reduced by more than 20 °C relative to the triglyceride with a similar fatty acid composition.
  • a decrease in undercooling due to the addition of a propylene glycol spacer between the glycerol and the fatty acid can be observed with a greater than 30% decrease in the undercooling of the bulk phase, more preferably with a greater than. 50% decrease, more preferably with a greater than 70% decrease, and even more preferably with a greater than 75% decrease.
  • specific decreases of 76.1%, 38.3%, 77.7%, 67.2%, 81.3%, 74.8%, 72.7% are considered within the scope of this disclosure.
  • the bulk crystallization of the material is the intent of the above teaching and the temperature of the onset of crystallization of the bulk phase is used in determining the degree of undercooling. It is understood that the addition of another component with higher melt point can change the measured undercooling. This minor phase is not used as the onset of crystallization; however, a note is made to differentiate this minor crystallization from the bulk phase crystallization.
  • the alkoxylate may be ethylene oxide, propylene oxide, butylene oxide, or a combination thereof.
  • alkoxylated glycerol is highly dependent on the ratio of EO, PO, and BO utilized in the polyether segments. Alkoxylated glycerols that are high in EO will have increased polarity leading to a high level of solubility in water, whereas increasing the amount of PO produces a less polar alkoxylated glycerol ester with greater oil solubility. It is also known
  • SUBSTITUTE SHEET (RULE 26) that exceeding a certain number of EO groups in a block can create issues with the crystallization of the EO blocks.
  • This ratio of EO-PO allows for significant control in the development, of surfactants.
  • Polyalkylene glycol (PAG) lubricants have taken advantage of this characteristic and were originally used in water- based lubricants. More recently, commercially available PO/BO arid BO lubricants have been introduced. In U. S. Patent 10,160,928 B2, it is disclosed that BO decreases issues associated with the demulsification of the UCON OSP lubricants.
  • the inventors have produced ethoxylated glycerol esters with similar molecular weights to the propoxylated glycerol esters, within about 6%.
  • the ethoxylated glycerol exhibited very similar viscosities with higher viscosity indices compared to the propoxylated glycerol esters with the same fatty acid composition, see FIG. 14, Table 13.
  • the pour point of the ethoxylated glycerol esters were elevated by over 20 °C. This can be explained by the greater polarity of the ethoxy groups compared to the propoxy groups. The solubility of water was found
  • SUBSTITUTE SHEET (RULE 26) to be significantly higher in the ethoxylated glycerol esters than the propoxylated glycerol esters. It was observed EO samples had 6,04% water solubility while the PO samples had a solubility of 0.58%, as determine by Karl Fischer titration at room temperature. As such, it would be expected that a base oil which is an alkoxy la ted glycerol ester, wherein the alkoxylate is a blend of PO/BO or even BO only, would be expected to have improved performance with specific regard to oil solubility and demulsification.
  • optimal base oil design may prefer the use of an ethoxylation of the glycerol; whereas, in another embodiment for a base oil, it may be preferable to use a butoxylation of the glycerol.
  • the alkoxylated polyol may be propoxylated glycerol preferably with a range from 3 to 20 propoxy groups per molecule, more preferable is a range of 5 to 12, more preferable is a range of 8 to 11, more preferable is a degree of propoxylation of 1.0.
  • the fatty acid is substantially whole cut.
  • at least one fatty acid source may substantially be whole cut.
  • Whole cut fatty acids are products of the direct fat splitting of natural oils and substantially comprise the native fatty acid composition of a representative natural oil.
  • the whole cut fatty acid may be "cleaned” as understood by those skilled in the art and/or partially fractiona ted.
  • specific cuts such as for purpose of example only but not intended to be limiting, high melt point cute, may also be employed.
  • Suitable whole cut fatty acids may be derived from vegetable or seed oils such as coconut oil, palm oil, palm kernel oil, palm fatty acid distillate, soybean oil, jatropha oil, rapeseed oil, canola oil, high oleic soybean oil, sunflower oil, high oleic sunflower oil, corn oil, cottonseed oil, castor oil, olive oil, safflower oil, or linseed oil.
  • the source for the fatty acid is fractionated or topped coconut oil, palm kernel oil, tallow, or palm oil.
  • Whole cut fatty acids may also be derived from animal oils such as fish oil, lard, tallow, or whale oil. Even further, the oil may include multifunctional fatty acids which may consist of dicarboxylic acids, hydroxy functional acids, or acids modified by techniques that may include but are
  • SUBSTITUTE SHEET not limited to epoxidation, maleination, metathesis, amidation, halogenation, hydration, hydroformylation, dimerization, or estolide formation.
  • pure fatty acid stream may be used, such as caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, undecylic acid, lauric acid, tridecylic add, myristic acid, pentadecylic acid, palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, heneicosylic acid, behenic acid, oleic acid, linoleic acid, and erucic acid.
  • functional acids such as undecylenic acid are understood to be included in this work.
  • Fatty acids obtained by high-pressure splitting of plant oils are distilled and can be fractionated into various fractions or individual cuts. Fractionation makes it possible to separate the fatty acid mixtures into narrower cuts or even individual components. Topped describes the removal of a lower boiling fraction from the fatty acid mixture.
  • the fatty acids may be from hydrogenated oils.
  • the fatty acid may be a dicarboxylic acid such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, or octadecanedioic acid.
  • More than one fatty acid may be employed, and the fatty acid may be a functionalized acid.
  • Functionalization of a fatty acid may occur before or after esterification to the alkoxylated glycerol. Functionalization may comprise epoxidation, maleination, metathesis, amidation, halogenation, hydration, estolide formation., hydroformylation, dimerization, or vulcanization.
  • the functionalized acid may be saturated or unsaturated, such as a saturated functionalized acid such as 12-hydroxystearic acid.
  • the structure of the fatty acid may vary as well.
  • the fatty acid may be branched, cyclic or aromatic.
  • Branched fatty acids may include but are not limited to 2-ethylhexanoic acid or isostearic acid.
  • the oil will have improved physical properties including a pour point at or below 0 ° C, preferably below -10 °C, preferably below -20 ° C, preferably below -30 °C and most preferably below -40 °C being disclosed as well.
  • this disclosure By utilizing fatty acid(s) in conjunction with alkoxylated glycerol (s), this disclosure generates base oils that have high biobased carbon content (>40 %, such as >45, >50, >55, >60, >65, >70, >75, >80, >85, >90, >95, etc.) determined by ASTM
  • Biobased carbon content refers to materials which are derived from biological products or renewable domestic agricultural materials (including plant., animal, and marine materials) or forestry materials or an intermediate feedstock or agricultural byproduct, such as soapstock.
  • the polyol used to produce an ester-based lubricant is bioderived. Bio-derived glycerol would be preferred for this reason.
  • the lubricating base oil may be at least 40 percent biobased carbon, such as for purposes of examples only and not intended to be limiting 45 percent, 50, 55, 60. 65, 70, 75, 80, 85, 90, 95, etc., more preferably the lubricating base oil is at least 50 percent biobased carbon, and most preferably the lubricating base oil is at least 55 percent biobased carbon.
  • Biodegradability refers to the ability of a material to be decomposed by bacteria or other living organisms.
  • the lubricating base oil may be at least 50 percent biodegradable, such as for purposes of example only and not intended to be limiting 55 percent, 60, 65, 70, 75, 80, 85, 90, 95, etc., more preferably the lubricating base oil is at least 50 percent biodegradable, and most preferably the lubricating base oil is at least 60 percent biodegradable.
  • the lubricating base oil may have a molecular weight ⁇ 500 g/mole, preferably ⁇ 600 g/mole, preferably ⁇ 700 g/mole, preferably ⁇ 800 g/mole, and most preferably ⁇ 1000 g/mole and a viscosity index of ⁇ 160, such as 165, 170, 175, 180, 185, 190, 195, 200, or higher.
  • Performance of the oil may also be enhanced by incorporating additives such as antioxidants, anti-wear, anticorrosion, anti-sludge, anti-foam, demulsifiers, viscosity index improvers, detergents/dispersants, pour-point depressants, alkalinity improvers, friction modifiers, seal swell agents, metal deactivators/complexing agents, and extreme pressure agents.
  • additives such as antioxidants, anti-wear, anticorrosion, anti-sludge, anti-foam, demulsifiers, viscosity index improvers, detergents/dispersants, pour-point depressants, alkalinity improvers, friction modifiers, seal swell agents, metal deactivators/complexing agents, and extreme pressure agents.
  • additives such as antioxidants, anti-wear, anticorrosion, anti-sludge, anti-foam, demulsifiers, viscosity index improvers, detergents/dispersants, pour-point depressants, alkalinity improve
  • SUBSTITUTE SHEET (RULE 26) that are triglyceride based, synthetic polyol ester based, polyalklene glycol based, or other Group I, II, III, IV, or Group V based.
  • the current disclosure provides methods of preparation. For instance, a method of stabilizing the 6-hydrogen of glycerol in a base oil wherein the free hydroxyl groups of the glycerol are alkoxylated with ethylene oxide, propylene oxide, butylene oxide, or a combination thereof to form an alkoxylated glycerol.
  • the disclosure also provides a synthetic ester lubricating base oil with improved oxidative, thermal and hydrolytic stability including an ester of alkoxylated glycerol with an average degree of alkoxylation ⁇ 3, and at least one fatty acid having ⁇ 8 carbon atoms.
  • the disclosure also provides a synthetic ester lubricating base oil with improved oxidative, thermal and hydrolytic stability comprising an ester of alkoxylated glycerol with an average degree of alkoxylation ⁇ 3, and at least one fatty acid having ⁇ 8 carbon atoms.
  • the alkoxylated glycerol may be propoxylated preferably with a degree ofpropoxylation of 10.
  • a source for at least one fatty acid may be substantially whole cut.
  • the source for the fatty acid may be coconut oil, high oleic soybean oil, soybean oil, corn oil, canola oil, sunflower oil, or rapeseed.
  • the source for the fatty acid may be fractionated or topped coconut, oil, palm kernel oil, tallow’, or palm oil.
  • the at least one fatty acid may be a dicarboxylic acid.
  • the dicarboxylic acid may comprise adipic acid, az-elaic acid, oi' sebacic acid.
  • the at least one fatty acid may be a functionalized acid.
  • the saturated functionalized acid may include 12-hydroxystearic acid, 2-ethylhexanoic acid, or isostearic acid. ’
  • the functionalization may comprise epoxidation, maleination, metathesis, amidation, halogenation, hydration, estolide formation, hydroformylation, dimerization, or vulcanization.
  • At least one fatty arid may be branched.
  • the branched acid may comprise 2-ethylhexanoic acid, or isostearic acid.
  • the lubricating base oil may have a pour point at or below -1.0 °C.
  • the lubricating base oil may be at least 60 percent biodegradable.
  • the lubricating base oil may be at least 50 percent biobased.
  • the molecular weight may be ⁇ 1000 g/mole,
  • the lubricating base oil may have a viscosity index of ⁇ 160, Further, the disclosure provides a synthetic lubricant, that includes a significant proportion of the synthetic ester lubricating base oil and may contain an additive selected from
  • SUBSTITUTE SHEET (RULE 26) antioxidants, anti -wear agents, anticorrosion agents, anti-sludge agents, and/or extreme pressure agents. Further, the disclosure provides a lubricating base oil or blown oil that may be modified through an oxidative process at elevated temperatures.
  • the current disclosure may also provide a method of stabilizing the B- hydrogen of glycerol in a base oil where the free hydroxyl groups of the glycerol are alkoxylated with ethylene oxide, propylene oxide, butylene oxide, or a combination thereof to form an alkoxylated glycerol.
  • the base oil may have improved oxidative, thermal and hydrolytic stability comprising an ester of alkoxylated glycerol with an average degree of alkoxylation ⁇ 3, and at least, one fatty acid having ⁇ 8 carbon atoms.
  • the alkoxylated glycerol may be propoxylated preferably with a degree of propoxylation of 10.
  • a source for at least one fatty acid may be substantially whole cut,
  • the source for the fatty acid may be coconut oil, high oleic soybean oil, soybean oil, corn oil, canola oil, sunflower oil, or rapeseed oil.
  • the source for the fatty acid may be fractionated or topped coconut oil, palm kernel oil, tallow, or palm oil.
  • the at least one fatty acid may be a diearboxylic acid.
  • the dicarboxylic acid may comprise adipic acid, azelaic acid, or sebacic acid.
  • At least one fatty acid may be a functionalized acid. Functionalization and or hydrogenation may occur before or after reacting the fatty acid to the ester.
  • the saturated functionalized acid may comprise 12 -hydroxystearic acid, 2-ethylhexanoic acid, or isostearic acid.
  • the functionalization may comprise epoxidation, raaleination, metathesis, amidation, halogenation, hydration, estolide formation, hydroformylation, dimerization, or vulcanization.
  • At. least one fatty acid may be branched.
  • the branched acid may comprise 2-ethylhexanoic acid or isostearic acid.
  • the lubricating base oil may have a pour point at or below -10 °C.
  • the lubricating base oil may be at least 60 percent biodegradable.
  • the lubricating base oil may be at least 50 percent biobased.
  • the molecular weight may be ⁇ 1000 g/mole.
  • the lubricating base oil may have a viscosity index of ⁇ 160.
  • the current disclosure also provides a synthetic lubricant that may include a synthetic ester lubricating base oil incorporating an additive selected from antioxidant, anti-wear, anticorrosion, anti -sludge, and/or extreme pressure
  • the current disclosure also provides a blown oil including the synthetic ester lubricating base oil where the lubricating base oil may have been modified through an oxidative process at elevated temperatures.
  • the lubricating base oil may also be part of a cosmetic formulation.
  • One aspect of the present, disclosure is the use of the propoxylated glycerol ester as a lubricating base oil, either neat or as a formulated product, in Industrial Lubricants: gear oils, R&O compressor oils, R&O turbine oils; Automotive Oils: crankcase oils, transmission oils, gear oils; Metal Working Fluids; Marine Lubricants; Grease; Process Oil; or Dielectric Fluids.
  • the current disclosure may also provide a blown oil blend comprising partial or complete replacement of the synthetic ester lubricating base oil, wherein the lubricating base oil has been modified through an oxidative process at elevated temperatures to produce heat stable, high viscosity base oils.
  • a typical blowing process involves heating the oil to 70 to 1.20 °C and passing air through the liquid. The modification causes the formation of C-O-C and C-C cross links, and hydroxyl and carboxyl functional groups.
  • the blown oils can be used as additives, as thickeners, or to give surface-active properties to the formulation. They can offer features such as lubricity, biodegradability, high flash point, thickening, and low toxicity.
  • Lubricant compositions of the present invention have utility in applications where the oil in use has contact with the environment, particularly contact with water, air, and particulate contaminants. Such applications encompass hydraulic fluids for mobile equipment, universal tractor fluids, gear and transmission oils for mining and forestry equipment. With enhanced hydrolytic and thermo-oxidative stability, lubricant compositions of the present invention are suited to applications prone to contamination. Additionally, with biobased and biodegradable compositions, the lubricant compositions of the present, invention are suited to applications with high incidence of leaks and oil loss.
  • Lubricant compositions of the present, invention have particular utility as turbine oils for hydropower turbines. Presently, hydropower turbines must.
  • SUBSTITUTE SHEET utilize mineral based oils as they provide the stability and lifetime desired for the application because common biobased and biodegradable oils fail to meet the stability criteria.
  • the oils of the present invention provide high biobased content, are readily biodegradable, and have thermo-oxidative stability on par with common mineral turbine oils, such as Chevron GST and Shell Turbo T.
  • Chevron GST and Shell Turbo T common mineral turbine oils
  • development for the oils of the present invention has provided initial data demonstrating the utility of the compositions as hydropower turbine oils. Further embodiments are illustrated in the following Examples, which are given for illustrative purposes only and are not intended to limit, the scope of the disclosure.
  • Method A Charging an appropriate reaction vessel with the alkoxylated glycerol and a 10% molar excess of the required fatty acid(s). The esterification was carried out at 240 — 250 c C and run under vacuum until the acid
  • SUBSTITUTE SHEET (RULE 26) value of the reaction mixture was below about 15 mg KOH/g and the hydroxyl value of the reac tion mixture was below about 20 mg KOH/g, Excess fatty acid and volatile reaction by-products were then removed via short path distillation under vacuum and elevated temperature. Common ester purification techniques may be utilized in the absence of short path distillation.
  • the ester product, of the reaction was purified to an acid value ⁇ 1 mg KOH/g with a preferred acid value ⁇ 0,5 mg KOH/g, and a hydroxyl value ⁇ 10 mg KOH/g with a preferred hydroxyl value ⁇ 5 mg KOH/g,
  • the alkoxylated glycerol ester is considered a triester when a hydroxyl value of less than 15 mg KOH/g is achieved, or more preferably less than 10 mg KOH/g, or most preferably less than 5 mg KOH/g.
  • Method B The alkoxylated glycerol ester lubricant base oils of the present- disclosure were prepared by charging an appropriate reaction vessel with the alkoxylated glycerol, a 10% molar excess of the required fatty acid(s), and 0.5 mole% methanesulfonic acid. The esterification was carried out at 170 °C and run under vacuum until the acid value of the reaction mixture was below about 15 mg KOH/g and the hydroxyl value of the reaction mixture was below about 10 mg KOH/g. Excess fatty acid and volatile reaction by-products were then removed via short path distillation under vacuum and elevated temperature. Common ester purification techniques may be utilized in the absence of’ short path distillation.
  • the ester product of the reaction was purified to an acid value ⁇ 1 mg KOH/g with a preferred acid value ⁇ 0,5 mg KOH/g, and a hydroxyl value ⁇ 10 mg KOH/g with a preferred hydroxyl value ⁇ 5 mg KOH/g.
  • Method C The alkoxylated glycerol ester lubricant base oils of the present disclosure were prepared by charging an appropriate reaction vessel with the alkoxylated glycerol, a 0.1% molar deficiency of the required fatty acid(s), and 0.5 mole% methanesulfonic acid. The esterification was carried out at 170 °C and run under vacuum until the acid value of the reaction mixture was below about 3 mg KOH/g and the hydroxyl value of the reaction mixture was below about. 10 mg KOH/g, at which point an addition of short chain fatty acids ( ⁇ C12) occurred and the reaction was continued until the hydroxyl value is below 5 mg KOH/g. Excess fatty acid and volatile reaction byproducts were then removed via short, path
  • SUBSTITUTE SHEET (RULE 26) distillation under vacuum and elevated temperature.
  • Common ester purification techniques may be utilized in the absence of short path distillation.
  • the ester product of the reaction was purified to an acid value ⁇ 1 mg KOH/g with a preferred acid value ⁇ 0.5 mg KOH/g, and a hydroxyl value ⁇ 10 mg KOH/g with a preferred hydroxyl value ⁇ 5 mg KOH/g.
  • TMP is trimethylolpropane.
  • C8-C10 is a topped fraction of coconut oil.
  • C12 is lauric acid.
  • Pamolyn is a commercial fatty acid that is high in oleic acid and derived from tall oil.
  • BFT is oleic acid derived from bleachable fancy tallow.
  • HOSO high oleic soybean oil.
  • SBO is soybean oil.
  • EH 2-ethylhexanoic acid.
  • €'18 Iso is isostearic acid.
  • 12-HSA is 12-hydroxystearic acid.
  • EG## is an ethoxylated glycerol ester with an average degree of ethoxylation - ##.
  • Examples 89-91 see FIG. 2 Proton NMR was performed to evaluate the strength of the hydrogen bonds at the glycerol, propoxylated glycerol ester, and TMP base oils. High electron density around a proton stabilizes its bond to the adjacent carbon atom and correlates to NMR absorbance at a lower ppm value. Electronegative groups attached to the C-H system decrease the electron density around the protons and increase their chemical shift to higher ppm values. The 1 H NMR peaks, see FIG. 3, Table 2, of the alpha-methine and beta -methylene protons of the glycerol ester, see FIG.
  • Example 98 an unsaturated propoxydated glycerol ester with a viscosity grade of 68, showed a RPVOT lifetime of 28 minutes while Example 103, a saturated propoxy la ted glycerol ester with a viscosity grade of 58, had an RPVOT lifetimes of 31 min.
  • soybean oil and Canola oil were tested.
  • the unsaturated propoxylated glycerol ester exhibits a 64% increase in the RPVOT lifetime compared to the best performing natural glycerol ester and the saturated propoxylated glycerol ester exhibits an 82% increase.
  • the performance of the propoxylated glycerol ester significantly exceeds the RPVOT lifetime of TMP trioleate. See, Lubrication Science, 2015, 27(6), p 369.
  • the data for hydrolytic stability testing (ASTM 1)2619) of several saturated ester base oils can be seen in Table 4. see FIG, 5. Saturated esters were used to determine the inherent stability of the ester without confounding factors (unsaturation and secondary oxidation products).
  • the propoxylated glycerol ester base oil sample (Ex. 91 and 103) shows greater resistance to hydrolysis than glycerol esters (Ex. 92) and TMP esters (Ex. 90). Reduced hydrolysis indicates increased stability in the presence of water, heat, and catalyst and is supported by RPVOT lifetime data.
  • Examples 90, 92-94 Reductions in the enthalpy of melting are observed for propoxylated glycerol esters and TMP esters relative to the glycerol ester, see FIG. 6, Table 5, FIG. 7, Table 6 and FIG. 8, Table 7.
  • Example 94 (PG-10 derivative) possesses the greatest reduction in melt enthalpy and the lowest degree of undercooling for C12 esters in FIG, 6, Table 5. DSC analysis was conducted within the temperature range -80 °C to 40 °C with cyclic cooling and heating rates of 5
  • Examples 91, 95-98, 100, 107, 109 Alteration of the fatty acid component of the esters has a clear effect on the melt enthalpy, cloud point, and pour point, see FIG. 8, Table 7. Materials that form a well-defined crystal structure appear opaque under visual inspection below the pour point. Less ordered or structured materials appear translucent or transparent when observed at temperatures below their pour point and require less heat to melt. Unexpectedly, the base oils of this disclosure can be modified such that the solid structure of the material can range from opaque crystalline solid to transparent amorphous solid.
  • Examples 90, 98-104 see FIG. 9, Table 8: Representative base oils derived from propoxylated glycerol (PG 10) and whole cut, or substantially whole
  • SUBSTITUTE SHEET (RULE 26) cut, fatty acid sources. All examples have pour points and viscosities representative of lubricating base oils in ISO VG 46-68 and SAE30. All samples exhibit very high viscosity indices (>180), and Examples 91, 98, and 100 remain transparent below their pour points as indicated by no observed cloud point.
  • Example 103 see FIG. 10, Table 9: One iteration of the base oil of this disclosure.
  • Example 103 was tested for biodegradability according to OECD 301B. The sample was found to exhibit “Ready biodegradability in an aerobic aqueous medium” with 61% biodegradation at the end of the 10-day window,
  • Example 103 and 98 see FIG. 11, Table 10: Biobased Carbon Analysis. Examples 103 and 98 were characterized using ASTM method D6866-20 to determine the % Biobased Carbon that composes the base oil. The variation in the biobased carbon content is based on the degree of alkoxylation and the fatty acid carbon number,
  • Examples 105-109 see FIG. 12, Table 1.1: Base oils that utilize branched, functional, and diacid species to alter physical properties of the base oils. All examples retain low pour points, representative viscosities, and high viscosity indices. Examples 107-109 expand the potential range of applications as they match ISO VG 100 and 150 oils. The higher viscosity oils would be prime candidates as base oils for greases and gear oils.
  • Example 103 (Formulated) see FIG. 13, Table 12: One iteration of the base oil of this disclosure, Example 103, was formulated using commercial ⁇ available antioxidant, anti-corrosion and anti-wear additive packages for use as turbine oil and as hydraulic/universal tractor fluid (additive packages supplied by Tiarco Chemical and King Industries, respectively). The two formulations of the base oil were then compared using common bench tests to Chevron GST (ISO VG 68) and to a formulated soybean oil and a formulated canola oil using King Industries NA- Lube BL-1208 additive system. Chevron GST was included as an industry leading turbine oil suited for use in gas, steam, and hydropower turbines, as well as in hydraulic controls within hydropower facilities.
  • Chevron GST was included as an industry leading turbine oil suited for use in gas, steam, and hydropower turbines, as well as in hydraulic controls within hydropower facilities.
  • Examples 110-112 see Figure 14, Table 13: Ethoxylated glycerol ester properties.
  • Ethoxylated glycerol (EG 12, Lumulse 12 from Vantage Oleochemical)
  • Example 26 SUBSTITUTE SHEET (RULE 26) wherein the molecule has an average of 12 ethoxy groups was esterified with coconut fatty acid (Example 110), lauric acid (Example 11), via Method A, Table 13 compares the ethoxylated glycerol esters to the propoxylated glycerol esters with similar fatty acid sources.
  • Example 112 is a propoxy-ethoxylated glycerol ester trioleate produced using Method A.
  • the EO capped propoxylated glycerol (PG10EGc, Carpel 725 from Carpenter Chemical) is a glycerol with an average of 10 propoxy groups where each terminal propoxy group is capped with one ethoxy group (3 EO per molecule).

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Abstract

Des procédés de stabilisation de l'hydrogène bêta d'esters à base de glycérol par l'insertion de groupes alcoxy sont décrits dans la présente invention, pour considérablement améliorer la stabilité thermique, oxydative et hydrolytique de l'ester et permettre la régulation de la densité molaire de liaisons ester dans les lubrifiants en vue d'optimiser la stabilité hydrolytique tout en assurant la biodégradabilité et en améliorant davantage les propriétés de performances.
EP20838706.8A 2020-12-09 2020-12-09 Lubrifiant biodégradable présentant une stabilité hydrolytique adaptée et une stabilité thermique améliorée par le biais d'une alkoxylation de glycérol Pending EP4232533A1 (fr)

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US3337595A (en) 1960-09-15 1967-08-22 Nalco Chemical Co Fatty acid esters of polyoxypropylated glycerol
GB1157653A (en) 1966-06-24 1969-07-09 Bp Chem Int Ltd Improvements in or relating to Synthetic Lubricants
US4031118A (en) 1973-09-17 1977-06-21 The Lubrizol Corporation Ester-containing process and compositions
DE4323771A1 (de) 1993-07-15 1995-01-19 Henkel Kgaa Grundöl auf Triglyceridbasis für Hydrauliköle
US5916854A (en) 1995-02-14 1999-06-29 Kao Corporation Biodegradable lubricating base oil, lubricating oil composition containing the same and the use thereof
US6495188B2 (en) 2000-12-13 2002-12-17 Arco Chemical Technology L.P. Plastic and semisolid edible shortening products with reduced trans-fatty acid content
EP1335015A1 (fr) 2002-01-23 2003-08-13 Oleon Esters lubrifiants avec gonflement réduit d'élastomères
WO2012134792A1 (fr) 2011-03-29 2012-10-04 Dow Global Technologies Llc Composition lubrifiante
WO2012173878A1 (fr) 2011-06-14 2012-12-20 Dow Global Technologies Llc Lubrifiants contenant des esters naturels et synthétiques ayant une stabilité hydrolytique améliorée
WO2014124698A1 (fr) 2013-02-18 2014-08-21 Amril Ag Lubrifiant d'ester destiné à des applications de lubrifiant de champ pétrolier et d'autres d'applications de lubrifiant industriel
WO2015069509A1 (fr) 2013-11-07 2015-05-14 Dow Global Technologies Llc Désémulsifiants pour des lubrifiants de polyalkylène glycol solubles dans de l'huile
US10190067B2 (en) 2016-02-24 2019-01-29 Washington State University High performance environmentally acceptable hydraulic fluid
CN108781467B (zh) 2016-03-31 2021-03-30 华为技术有限公司 一种空闲信道评测的竞争窗长度的确定方法及装置
MX2020013136A (es) * 2018-06-04 2021-02-02 Tetramer Tech Llc Aceite base lubricantes de polioles alcoxilados esterificados que utilizan acidos grasos saturados de cadena larga.

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