Hydraulic fluid composition for agricultural machinery

Abstract

A tractor hydraulic fluid composition is disclosed comprising (i) a main amount of lubricating viscosity oil, (ii) one or more dispersants, and (iii) one or more phosphate esters or amine salts of phosphate esters. The composition can be used to reduce brake noise and maintain frictional performance while providing lubrication to the hydraulic components of a tractor.

Description

[Technical Field]

[0001] Cross-reference of related applications This application claims priority to U.S. Provisional Application No. 63 / 494,587, filed on April 6, 2023, the disclosure of which is incorporated herein by reference.

[0002] This disclosure relates to hydraulic fluid compositions for use in agricultural machinery. More specifically, this disclosure describes tractor hydraulic fluid compositions for noise reduction and improved friction performance. [Background technology]

[0003] Hydraulic fluids used in agricultural machinery, such as tractors, are multi-purpose products used for lubricating various parts of the machine. These lubrication applications may include lubrication of gearboxes, power take-offs and clutches, rear axles, reduction gears, wet brakes, and hydraulic accessories. The components contained in tractor hydraulic fluids must be selected so that the resulting hydraulic fluid composition provides all the necessary properties required for various applications. Such properties include providing appropriate friction characteristics to prevent wet braking and / or clutch chatter in oil-immersion brakes and clutches, while simultaneously acting on wet brakes and clutches to provide power take-off (PTO) clutch performance in particular. Tractor hydraulic fluid compositions must provide sufficient wear resistance and extreme pressure properties, as well as water resistance / filtration capabilities.

[0004] The hydraulic fluid in a tractor needs to have sufficient friction for the system to operate efficiently. Wet clutches are often used for gear changes, and prolonged use can lead to a decrease in friction performance, potentially causing shift shock and / or clutch slippage. Maintaining the friction performance of the tractor's hydraulic fluid over long periods is crucial to ensuring optimal operation of the brakes and clutches.

[0005] Wet brakes or immersion brakes can produce brake chatter, or brake noise, which is a phenomenon caused by large torque fluctuations in the friction material or reaction plates, resulting in harmonic vibrations within the system. These vibrations translate into an unpleasant noise when the brakes are applied. Water contamination in the hydraulic fluid increases brake noise. Since agricultural machinery is often operated in environments where water is present (e.g., rice paddies or humid climates), tractor hydraulic fluid compositions need to be formulated to provide desirable lubrication characteristics while minimizing the effects of water contamination.

[0006] Therefore, there is a need for a tractor hydraulic fluid composition that provides desirable friction characteristics and minimizes brake noise in the presence of water. [Overview of the Initiative]

[0007] In one embodiment, a tractor hydraulic fluid composition comprising the following is provided:

[0008] (i) Main amount of lubricating viscosity oil,

[0009] (ii) one or more dispersants, and

[0010] (iii) One or more phosphate esters or amine salts of phosphate esters.

[0011] In certain embodiments, the composition comprises one or more succinimide dispersants.

[0012] In another embodiment, a method is provided for reducing tractor brake noise, which includes applying a tractor hydraulic fluid composition to a brake component or system within the tractor, and then operating the tractor.

[0013] In another embodiment, a method is provided for maintaining the frictional performance of a tractor, comprising applying a tractor hydraulic fluid composition to one or more components selected from the group consisting of a gearbox, power take-off and clutch(s), rear axle, reduction gear, wet brake and hydraulic accessories, and operating the tractor.

[0014] In certain embodiments, the tractor is operated in the presence of water or in a humid environment. [Modes for carrying out the invention]

[0015] This disclosure provides a hydraulic fluid composition for reducing brake noise and maintaining friction performance in agricultural machinery, particularly tractors. The composition comprises (i) a main amount of lubricating viscosity oil, (ii) one or more dispersants, and (iii) one or more phosphate esters or amine salts of phosphate esters.

[0016] In addition to providing lubrication to various parts of the machine, the tractor hydraulic fluid compositions disclosed herein are particularly useful in reducing brake noise in the presence of water. The tractor hydraulic fluid compositions disclosed herein also improve friction durability. These compositions improve the stability of the coefficient of friction of comparative compositions, such as those that do not contain the dispersant and phosphate ester or amine salt of the exemplary composition.

[0017] definition As used herein, "hydrocarbyl" refers to a group containing hydrogen and carbon, such as alkyl, alkenyl, alkynyl, and aryl groups. Hydrocarbyl groups can be cyclic, acyclic, branched, or linear.

[0018] As used herein, “alkyl” refers to a linear or branched hydrocarbon containing carbon atoms. In some embodiments, the alkyl group contains at least 1, 5, 10, 15, 20, 25, 30, 50, 100, 500, 1000, or 2000 carbon atoms.

[0019] As used herein, "alkenyl" refers to a linear or branched hydrocarbon group containing at least two carbon atoms and having one or more carbon-carbon double bonds. As used herein, "alkynyl" refers to a linear or branched hydrocarbon group containing at least two carbon atoms and having one or more carbon-carbon triple bonds. In some embodiments, the alkenyl group or alkynyl group contains at least 1, 5, 10, 15, 20, 25, 30, 50, 100, 500, 1000, or 2000 carbon atoms.

[0020] As used herein, "aryl" refers to an aromatic monocyclic or polycyclic hydrocarbon group having six or more carbon atoms. The aryl group is optionally substituted with one or more hydrocarbyl groups. In some embodiments, the aryl group has 6 to 14 carbon atoms. The aryl group includes, but is not limited to, a phenyl group, a naphthyl group, and a fluorenyl group. An exemplary substituted aryl group is, but is not limited to, a tolyl group.

[0021] As used herein, "alkalil" refers to an aryl group substituted with one or more alkyl groups.

[0022] As used herein, “major amount” means an amount greater than about 50 weight percent but less than 100 weight percent of the tractor hydraulic fluid composition described herein. In some embodiments, the amount is at least 60 weight percent, at least 70 weight percent, at least 80 weight percent, or at least 90 weight percent.

[0023] As used herein, “trace amounts” means an amount less than about 50 weight percent and greater than 0 weight percent of the tractor hydraulic fluid composition described herein. In some embodiments, the amount is less than 40 weight percent, less than 30 weight percent, less than 20 weight percent, or less than 10 weight percent.

[0024] As used herein, “TBN” refers to “Total Bases” and is a measure of pre-alkalinity. Generally, TBN is the neutralization capacity of one gram of a lubricating composition, expressed as the number equal to the number of mg of potassium hydroxide that provides equivalent neutralization. Thus, a TBN of 10 means that one gram of composition has a neutralization capacity equivalent to 10 mg of potassium hydroxide. The TBN of a sample can be determined by ASTM test number D2896, which is incorporated herein in whole by reference, or by any other equivalent procedure.

[0025] The term "overbasic" refers to a salt in which a metal-versus-ion, such as calcium, is present in amounts exceeding the stoichiometric value. Overbasic salts can have so-called greater than 100% conversion levels (i.e., they contain more than 100% of the metal required to convert an acid to its "normal" or "neutral" salt). The expression "metallic ratio," often abbreviated as MR, specifies the ratio of the total chemical equivalents of metal in an overbasic salt to the chemical equivalents of metal in a neutral salt, based on known chemical reactivity and stoichiometry. Thus, in a normal or neutral salt, the metallic ratio is 1, and in an overbasic salt, the MR is greater than 1.

[0026] The terms "low overbasic" or "LOB" refer to overbasic salts with a total number of fewer than 200 base pairs.

[0027] The terms "highly overbasic" or "HOB" refer to overbasic salts with a total number of 200 or more bases.

[0028] The term "succinimide" is generally accepted to mean the reaction product of an alkenyl-substituted succinic acid or anhydride with a polyamine, and includes alkenyl or alkyl mono-, bis-succinimide and other higher analogues.

[0029] The term "bissuccinimide" refers to a reaction product that is primarily bissuccinimide, but may also contain monosuccinimide. In some embodiments, the amount of monosuccinimide is about 5% by weight or less.

[0030] composition The composition of the present invention is a hydraulic fluid suitable for use in agricultural machinery, such as tractors. The composition can be used to lubricate various parts of agricultural machinery, such as wet brakes or immersion brakes, gearboxes, power take-offs and clutches, rear axles, reduction gears, and hydraulic accessories.

[0031] In one embodiment, the tractor hydraulic fluid composition comprises (i) a main amount of lubricating viscosity oil, (ii) one or more dispersants, and (iii) one or more phosphate esters or amine salts of phosphate esters.

[0032] In one embodiment, the tractor hydraulic fluid composition comprises (i) a major amount of lubricating viscosity oil, (ii) one or more succinimide dispersants, and (iii) one or more phosphate esters or amine salts of phosphate esters.

[0033] A composition that can be used to provide lubrication to various parts of agricultural machinery is effective in maintaining frictional performance over time and / or in the presence of water. This composition also extends to reducing brake noise or brake chatter, and is particularly effective in maintaining sufficient brake noise reduction in the presence of water.

[0034] When the composition is applied to agricultural machinery such as tractors, or used in the presence of water or a humid environment, the composition may come into contact with or be mixed with a small amount of water. A key advantage is that the composition of this disclosure maintains friction and brake noise reduction performance at operating temperatures in dry or humid conditions.

[0035] In certain embodiments, the composition improves the stability of the coefficient of friction, i.e., reduces the rate of increase in μs. This improvement is particularly noticeable when compared to comparative compositions that do not contain the dispersant and phosphate ester or amine salt of the exemplary composition. In certain embodiments, the composition provides an increase ratio of about 4.2 or less, or an increase ratio in the range of about 2.9 to about 4.2.

[0036] lubricating viscosity oil Lubricating viscosity oil (sometimes referred to as "base stock" or "base oil") is the main liquid component of lubricating oil, and additives and, optionally, other oils can be added to it to produce, for example, the final lubricating oil (or lubricating oil composition). Base oils are useful for producing concentrates and from which lubricating oil compositions can be selected from natural and synthetic lubricating oils, as well as combinations thereof.

[0037] Examples of natural oils include animal and vegetable oils, liquid petroleum-based oils, and hydrorefined and solvent-treated mineral oils of the paraffinic, naphthenic, and paraffinic-naphthenic mixed types. Oils with lubricating viscosity derived from coal or shale are also useful base oils.

[0038] Examples of synthetic lubricants include hydrocarbon oils (polymerized and interpolymerized olefins (e.g., polybutylene, polypropylene, propylene-isobutylene copolymer, chlorinated polybutylene, poly(1-hexene), poly(1-octene), poly(1-decene); alkylbenzenes (e.g., dodecylbenzene, tetradecylbenzene, dinonylbenzene, di(2-ethylhexyl)benzene); polyphenols (e.g., biphenyl, terphenyl, alkylated polyphenols); and alkylated diphenyl ethers and alkylated diphenyl sulfides, and their derivatives, analogs, and homologs).

[0039] Another preferred class of synthetic lubricants includes esters of dicarboxylic acids (e.g., malonic acid, alkylmalonic acid, alkenylmalonic acid, succinic acid, alkylsuccinic acid and alkenylsuccinic acid, maleic acid, fumaric acid, azelaic acid, suberic acid, sebacic acid, adipic acid, phthalic acid) with various alcohols (e.g., butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, ethylene glycol, diethylene glycol monoether, propylene glycol). Specific examples of these esters include dibutyl adipate, di(2-ethylhexyl) sebacate, hexyl fumarate, dihexyl fumarate, dioctyl sebacate, diisooctyl azelaate, diisodecyl azelaate, dioctyl phthalate, didecyl phthalate, dieicosyl sebacate, 2-ethylhexyl diester of linoleic acid dimer, and complex esters produced by reacting 1 mole of sebacate with 2 moles of tetraethylene glycol and 2 moles of 2-ethylhexanoic acid.

[0040] Esters useful as synthetic oils include esters produced from C5-C12 monocarboxylic acids and polyols, as well as polyol ethers such as neopentyl glycol, trimethylolpropane, pentaerythritol, dipentaerythritol, and tripentaerythritol.

[0041] The base oil can be derived from Fischer-Tropsch synthetic hydrocarbons.

[0042] Fischer-Tropsch synthetic hydrocarbons are produced from synthesis gas containing Fh and CO using a Fischer-Tropsch catalyst. Such hydrocarbons usually require further processing because they are useful as base oils. For example, hydrocarbons can be hydroisomerized, hydrocracking and hydroisomerized, dewaxed, or hydroisomerized and dewaxed using processes well known to those skilled in the art.

[0043] This lubricating oil composition may use unrefined oil, refined oil, and re-refined oil. Unrefined oil is obtained directly from natural or synthetic sources without further refining. For example, shale oil obtained directly from a dry distillation operation, petroleum obtained directly from distillation, or ester oil obtained directly from an esterification process and used without further processing are unrefined oils. Refined oil is similar to unrefined oil, except that it has been further processed in one or more refining steps to improve one or more properties. Many such refining techniques, such as distillation, solvent extraction, acid or base extraction, filtration, and osmosis, are well known to those skilled in the art.

[0044] Refined oil is obtained by processes similar to those used to obtain refined oil, which are applied to refined oil that is already in use. Such refined oil is also known as recycled oil or reprocessed oil and is often further processed by technologies for the approval of spent additives and oil cracking products.

[0045] Therefore, the base oil that can be used in the manufacture of this composition can be selected from any of the base oils in groups I to V specified in the American Petroleum Institute (API) Base Oil Interchangeability Guidelines (API Publication 1509). Such base oil groups are summarized in Table 1 below.

[0046] [Table 1]

[0047] (a) Measurements were taken according to ASTM D2007.

[0048] (b) Measurements were taken according to ASTM D2622, ASTM D3120, ASTM D4294, or ASTM D4927.

[0049] (c) Measurements were taken according to ASTM D2270.

[0050] Suitable base oils for use in this specification are any variety of API Group II oils, Group III oils, Group IV oils, and Group V oils, as well as combinations thereof, preferably those corresponding to Group III to Group V oils in terms of excellent volatility, stability, viscosity, and cleanliness characteristics.

[0051] The lubricating viscosity oil for use in the lubricating oil compositions of this disclosure, also referred to as the base oil, is typically present in a principal amount, for example, more than about 50% by weight, preferably more than about 70% by weight, more preferably about 80 to about 99.5% by weight, and most preferably about 85 to about 98% by weight, based on the total weight of the composition. As used herein, the term “base oil” should be understood to mean a base stock or mixture of base stocks that is a lubricating oil component, produced by a single manufacturer for the same specifications (independent of the source or location of the manufacturer), meeting the specifications of the same manufacturer, and identified by a unique formula, product identification number, or both. The base oil for use herein is any currently known or later developed lubricating viscosity oil used in formulating the lubricating oil compositions, which may be for any application such as engine oil, marine cylinder oil, functional fluid, etc., including hydraulic fluids, gear oils, and transmission fluids. In addition, the base oil for use in this specification may optionally include viscosity index improvers, such as polymer alkyl methacrylates, olefin copolymers, such as ethylene-propylene copolymers or styrene-butadiene copolymers, and mixtures thereof.

[0052] As those skilled in the art will readily recognize, the viscosity of the base oil depends on its application. Therefore, the viscosity of the base oils used herein is typically in the range of about 2 to about 2000 centistokes (cSt) at 100°C (Celsius). Generally, base oils used individually as engine oils have a kinematic viscosity range of about 2 cSt to about 30 cSt at 100°C, preferably about 3 cSt to about 16 cSt, and most preferably about 4 cSt to about 12 cSt, and are selected or blended depending on the desired end use and additives in the finished oil to produce engine oils of the desired grade (e.g., compositions having SAE viscosity grades such as 70W-75, 70W-80, 70W-85, 70W-90, 75W-75, 75W-80, 75W-85, 75W-90, 80W-75, 80W-80, 80W-85, 80W-90, 85W-75, 85W-80, 85W-85, 85W-90, monograde 80, 90, 140, ISO VG32, ISO VG46, ISO VG68, etc.). Furthermore, oils can be blended with viscosity grades specific to tractor hydraulic fluids, such as J20C and / or J20D.

[0053] Dispersant The compositions disclosed herein comprise one or more dispersants. Dispersants retain oil-insoluble oxidation-derived substances in a suspension, thus preventing sludge aggregation and precipitation or deposition on metal parts. Useful dispersants as described herein include nitrogen-containing ashless (metal-free) dispersants, which are known to be effective in reducing deposit formation when used in gasoline and diesel engines.

[0054] Suitable dispersants include hydrocarbyl succinimide, mixed esters / amides of hydrocarbyl succinimide and hydrocarbyl-substituted succinic acid, hydroxy esters of hydrocarbyl-substituted succinic acid, Mannich condensation products of hydrocarbyl-substituted phenols, formaldehyde, and polyamines. Condensation products of polyamines and hydrocarbyl-substituted phenyl acids are also suitable. Mixtures of these dispersants can also be used. Basic nitrogen-containing ashless dispersants are well-known lubricating oil additives, and methods for their preparation are extensively described in the patent literature.

[0055] In certain embodiments, the composition comprises one or more succinimide-containing dispersants or bissuccinimide-containing dispersants.

[0056] In certain embodiments, the composition comprises alkenylsuccinimide. In certain embodiments, the alkenyl substituent of alkenylsuccinimide is long-chain, for example, having more than 40 carbon atoms. These materials are readily produced by reacting hydrocarbyl-substituted dicarboxylic acid materials with molecules containing amine functional groups. Examples of preferred amines are polyamines such as polyalkylene polyamines, hydroxy-substituted polyamines, and polyoxyalkylene polyamines.

[0057] In certain embodiments, the composition includes an ashless dispersant such as polyisobutenyl succinimide. Polyisobutenyl succinimide, formed from polyisobutenyl succinic anhydride and a polyalkylene polyamine such as polyethylene polyamine of formula A, is: NH2 (CH2CH2NH) z H formula A,

[0058] (wherein z is 1 to 11). The polyisobutenyl group is derived from polyisobutene and preferably has a number-average molecular weight (M≫) in the range of 700 to 3000 daltons (e.g., 900 to 2500 daltons). For example, polyisobutenyl succinimide may be mono-succinimide or bis-succinimide derived from a polyisobutenyl group having an MW of 900 to 2500 daltons. As is known in the art, the dispersant may be post-treated (e.g., with a boronating agent or a cyclic carbonate, ethylene carbonate, etc.). In certain embodiments, the succinimide dispersant is a borated succinimide dispersant.

[0059] Nitrogen-containing ashless (metal-free) dispersants are basic and contribute to the TBN of the composition to which the dispersant is added without introducing additional sulfate ash.

[0060] In one embodiment, the composition comprises one or more bissuccinimide dispersants, such as hydrocarbylbissuccinimide.

[0061] Bissuccinimides are completed reaction products from the reaction of one or more polyamine reactants with hydrocarbon-substituted succinic acid or anhydride (or similar succinic acid acylating agents), and are intended to encompass compounds in which the product may have amide, amidine, and / or salt bonds in addition to imide bonds of the type resulting from the reaction of a primary amino group with an anhydride moiety. Bissuccinimides are prepared according to methods well known in the art, including but not limited to the following:

[0062] The term "succinimide" is understood in the art to also include many of the amide, imide, and amidine species formed by this reaction. However, the main product is succinimide, and the term is generally accepted to mean the product of the reaction between an alkenyl-substituted succinic acid or anhydride and a polyamine.

[0063] As used herein, this term includes alkenyl or alkyl mono-, bis-succinimide and other higher analogues.

[0064] In certain embodiments, the amount of one or more dispersants in the composition is about 0.1 to about 5% by weight of the total composition, for example, about 0.1 to about 4.5% by weight, about 0.1 to about 4.0% by weight, about 0.1 to about 3.5% by weight, about 0.1 to about 3.0% by weight, about 0.1 to about 2.5% by weight, about 0.1 to about 2.0% by weight, about 0.1 to about 1.5% by weight, about 0.1 to about 1.0% by weight, about 0.2 ~5.0% by weight, approximately 0.2~4.5% by weight, approximately 0.2~4.0% by weight, approximately 0.2~3.5% by weight, approximately 0.2~3.0% by weight, approximately 0.2~2.5% by weight, approximately 0.2~ About 2.0% by weight, about 0.2 to about 1.5% by weight, about 0.2 to about 1.0% by weight, about 0.3 to about 5.0% by weight, about 0.3 to about 4.5% by weight, about 0.3 to about 4.0% by weight, about 0.3 to about 3.5% by weight, about 0.3 to about 3.0% by weight, about 0.3 to about 2.5% by weight, about 0.3 to about 2.0% by weight, about 0.3 to about 1.5% by weight, about 0.3 to about 1.0% by weight, about 0.4 to about 5 .0% by weight, about 0.4 to about 4.5% by weight, about 0.4 to about 4.0% by weight, about 0.4 to about 3.5% by weight, about 0.4 to about 3.0% by weight, about 0.4 to about 2.5% by weight, about 0.4 to about 2. It is within the range of 0% by weight, approximately 0.4 to 1.5% by weight, approximately 0.4 to 1.0% by weight, approximately 0.5 to 5.0% by weight, approximately 0.5 to 4.5% by weight, approximately 0.5 to 4.0% by weight, approximately 0.5 to 3.5% by weight, approximately 0.5 to 3.0% by weight, approximately 0.5 to 2.5% by weight, approximately 0.5 to 2.0% by weight, approximately 0.5 to 1.5% by weight, or approximately 0.5 to 1.0% by weight.

[0065] Phosphate esters and amine salts of phosphate esters

[0066] The compositions disclosed herein comprise one or more phosphate esters or amine salts of phosphate esters.

[0067] In one embodiment, the phosphate ester is a compound according to formula 1: [ka]

[0068] Wherein, R 1 、R 2 and R 3 each is independently selected from H, C3-C 30 alkyl, and C3-C 30 alkenyl, and at least one of R 1 、R 2 and R 3 is not H.

[0069] In certain embodiments, at least one of R 1 、R 2 and R 3 is C 10 -C 30 alkyl. In certain embodiments, at least two of R 1 、R 2 and R 3 are C 10 -C 30 alkyl. In certain embodiments, at least one of R 1 、R 2 and R 3 is C 12 -C 18 alkyl. In certain embodiments, at least two of R 1 、R 2 and R 3 are C 12 -C 18 alkyl.

[0070] In certain embodiments, at least one of R 1 、R 2 and R 3 is C 10 -C 30 alkenyl. In certain embodiments, at least two of R 1 、R 2 and R 3 are C 10 -C 30 alkenyl. In certain embodiments, at least one of R 1 、R 2and R 3 At least one of them is C 12 ~C 18 It is an alkenyl. In a particular embodiment, R 1 , R 2 and R 3 At least two of them are C 12 ~C 18 It is Alkenil.

[0071] In certain embodiments, the alkyl group is linear or unbranched.

[0072] In certain embodiments, the alkenyl group is linear or unbranched.

[0073] In certain embodiments, one or more phosphate esters include a mixture of phosphate esters. In certain embodiments, one or more phosphate esters are alkyl(C) 12 ~C 18 ) Contains oleic acid phosphoric acid. In certain embodiments, one or more phosphate esters contain oleic acid phosphoric acid.

[0074] In one embodiment, the amine salt of the phosphate ester is a compound according to formula 2: [ka]

[0075] In the formula, R 1 and R 2 Each of these is H, C3~C 30 Alkyl and C3-C 30 Selected independently from Alkenil, R 1 and R 2 At least one of them is not H, and in the formula, each R is H, C1~C 30 Alkyl, and C1-C 30 Selected independently from alkenils. As described herein, + NR4 may be a primary amine, secondary amine, tertiary amine, or quaternary amine.

[0076] In certain embodiments, R 1 and R 2 at least one of which is C 10 ~C 30 alkyl. In certain embodiments, R 1 and R 2 at least two of which are C 10 ~C 30 alkyl. In certain embodiments, R 1 and R 2 at least one of which is C 12 ~C 18 alkyl. In certain embodiments, R 1 and R 2 at least two of which are C 12 ~C 18 alkyl.

[0077] In certain embodiments, at least one of R 1 and R 2 is C 10 ~C 30 alkenyl. In certain embodiments, at least two of R 1 and R 2 are C 10 ~C 30 alkenyl. In certain embodiments, at least one of R 1 and R 2 is C 12 ~C 18 alkenyl. In certain embodiments, at least two of R 1 and R 2 are C 12 ~C 18 alkenyl.

[0078] In certain embodiments, one R is H. In certain embodiments, two Rs are H. In certain embodiments, three Rs are H. In certain embodiments, four Rs are H.

[0079] In certain embodiments, at least one R is C3~C 30It is alkyl. In certain embodiments, at least one R is C3 - C 30 It is alkenyl.

[0080] In certain embodiments, the alkyl group is straight - chain or unbranched.

[0081] In certain embodiments, the alkenyl group is straight - chain or unbranched.

[0082] In certain embodiments, the amine salt of one or more phosphate esters includes an alkyl phosphate ester amine salt.

[0083] In certain embodiments, the alkyl group and the alkenyl group are not a substituted aryl group.

[0084] [[ID=二十一]] [[ID=二十二]] In certain embodiments, the amount of one or more phosphate esters or amine salts of phosphate esters in the composition ranges from about 0.1 to about 2 wt%, about 0.1 to about 1 wt%, or about 0.1 to about 0.5 wt% of the total composition.

[0085] Detergent

[0086] In one embodiment, the composition includes one or more low - over - based detergents. In certain embodiments, the total concentration of one or more low - over - based detergents ranges from about 5 to about 20 mM.

[0087] In one embodiment, the composition includes one or more high - over - based detergents. In certain embodiments, the total concentration of one or more high - over - based detergents ranges from about 45 to about 180 mM.

[0088] In one embodiment, the composition includes one or more low - over - based detergents and one or more high - over - based detergents. In certain embodiments, the total concentration of one or more detergents ranges from about 50 to about 200 mM.

[0089] Low - over - based (LOB) detergent In one embodiment, the composition comprises one or more low-perbasic (LOB) detergents, such as LOB sulfonates, salicylates, or phenate detergents.

[0090] In some embodiments, the LOB sulfonate cleaning agent is a salt derived from an alkali metal, an alkaline earth metal, or a mixture thereof. In certain embodiments, the LOB sulfonate cleaning agent is a calcium sulfonate cleaning agent.

[0091] In certain embodiments, the composition comprises one or more LOB alkali sulfonates. In some embodiments, the composition comprises calcium LOB alkali sulfonates, such as alkyl-substituted benzenes or alkyl-substituted toluenesulfonates.

[0092] The alkali metal or alkaline earth metal (e.g., calcium) content described by one or more LOB detergents present in the tractor hydraulic fluid composition is 0.001 to 0.1 weight percent of the composition. In some embodiments, the alkali metal or alkaline earth metal (e.g., calcium) content described by one or more LOB detergents is 0.01 to 0.09, 0.01 to 0.08, 0.01 to 0.07, or 0.01 to 0.06, 0.01 to 0.05, or 0.01 to 0.04 weight percent of the composition.

[0093] In some embodiments, the LOB cleaner has TBN less than 200, less than 150, less than 140, less than 130, less than 120, less than 110, less than 100, less than 90, less than 80, less than 70, less than 60, less than 50, or less than 40 mgKOH / g on an active substance basis. In some embodiments, the TBN is in the range of about 2 to 100, 2 to 80, or 2 to 60 mgKOH / g on an active substance basis.

[0094] Highly Superbasic (HOB) Cleaning Agents In one embodiment, the composition comprises one or more highly overbasic (HOB) detergents, such as HOB sulfonate detergents or HOB phenate detergents. In a particular embodiment, the composition comprises one or more HOB sulfonate detergents. In a particular embodiment, the composition comprises one or more HOB phenate detergents.

[0095] In some embodiments, the HOB sulfonate cleaning agent is a salt derived from an alkali metal, an alkaline earth metal, or a mixture thereof. In certain embodiments, the HOB sulfonate cleaning agent is a calcium sulfonate cleaning agent.

[0096] In certain embodiments, the composition comprises one or more HOB alkali sulfonates. In some embodiments, the composition comprises calcium HOB alkali sulfonates, for example, alkyl-substituted benzenes or alkyl-substituted toluene sulfonates.

[0097] The alkali metal or alkaline earth metal (e.g., calcium) content, as described by one or more HOB cleaners present in the tractor hydraulic fluid composition, is 0.001 to 2.0 weight percent of the composition. In some embodiments, the alkali metal or alkaline earth metal (e.g., calcium) content, as described by one or more HOB cleaners, is 0.001 to 2.0, 0.01 to 1.0, 0.01 to 0.90, 0.01 to 0.70, or 0.01 to 0.50, 0.01 to 0.40 weight percent of the composition.

[0098] In some embodiments, the HOB cleaner has TBN greater than 200, 300, 400, 500, 600, or 700 mgKOH / g based on the active substance. In some embodiments, the TBN is in the range of about 300-800 on the active substance, for example, 400-800, 400-700, 450-700, 500-700, 500-700, or 500-600 mgKOH / g.

[0099] Sulfonates can typically be prepared from sulfonic acids obtained by the sulfonation of alkyl-substituted aromatic hydrocarbons, such as those obtained from the fractional distillation of petroleum or by the alkylation of aromatic hydrocarbons. Examples include those obtained by alkylating benzene, toluene, xylene, naphthalene, diphenyl, or their halogen derivatives. Alkylation can be carried out in the presence of an alkylating agent having about 3 to more than 70 carbon atoms and a catalyst. Alkali sulfonates typically contain about 9 to about 80 or more carbon atoms per alkyl-substituted aromatic moiety, preferably about 16 to about 60 carbon atoms, preferably about 16 to 30 carbon atoms, and more preferably 20 to 24 carbon atoms.

[0100] In one embodiment, the HOB phenate cleaning agent is a phenolic cleaning agent. In another aspect of the present disclosure, the phenolic cleaning agent is an isomerized olefin phenate cleaning agent.

[0101] In one embodiment, the phenolic cleaning agent is an alkylated phenate cleaning agent, where the alkyl group is derived from an isomerized linear alpha-olefin having about 10 to about 40 carbon atoms per molecule.

[0102] In one embodiment, the phenolic cleaning agent has a linear alpha-olefin isomerization level (I) of about 0.10 to about 0.40, preferably about 0.10 to about 0.30, preferably about 0.12 to about 0.30, and more preferably about 0.22 to about 0.30.

[0103] In one embodiment, the phenate cleaning agent is a sulfurized phenate cleaning agent.

[0104] In one embodiment, the isomerized olefin phenate cleaning agent can be prepared as described in U.S. Patent No. 8,580,717, which is incorporated herein by reference in its entirety.

[0105] In one embodiment, the alkyl group is derived from an isomerized alphaolefin having about 14 to about 30, about 16 to about 30, about 18 to about 30, about 20 to about 28, 2.0 to about 24, or about 18 to about 28 carbon atoms per molecule.

[0106] In another embodiment, the isomerization level of the alpha-olefin is about 0.26 and it has about 20 to about 24 carbon atoms.

[0107] In some embodiments, the calcium content of the HOB phenate cleaning agent is 0.005-0.08, 0.01-0.08, 0.01-0.07, 0.01-0.06, 0.01-0.05, or 0.01-0.045 percent by weight, based on the weight of the composition.

[0108] Other cleaning agents Other cleaning agents that may be used include oil-soluble perbasic sulfonates, salixalates, salicylates, saligenin, compound cleaning agents and naphthenate cleaning agents, as well as metals, particularly alkali metals or alkaline earth metals, such as barium, sodium, potassium, lithium, calcium, and magnesium, and other oil-soluble alkylhydroxybenzoates. The most commonly used metals are calcium and magnesium, both of which may be present in the cleaning agents used in lubricants, as well as mixtures of calcium and / or magnesium with sodium.

[0109] Overbasic metal detergents are generally produced by carbonating a mixture of hydrocarbons, detergent acids (e.g., sulfonic acid, alkyl hydroxybenzoate), metal oxides or hydroxides (e.g., calcium oxide or calcium hydroxide), and accelerators such as xylene, methanol, and water. For example, to prepare overbasic calcium sulfonate, in carbonation, calcium oxide or calcium hydroxide reacts with gaseous carbon dioxide to form calcium carbonate. The sulfonic acid is neutralized by excess CaO or Ca(OH)2 to form a sulfonate.

[0110] An overbasic detergent may be a low-overbasic overbasic salt, for example, an overbasic salt having a TBN of less than 100 based on the active substance. In one embodiment, the TBN of a low-overbasic salt may be about 30 to about 100. In another embodiment, the TBN of a low-overbasic salt may be about 30 to about 80. An overbasic detergent may be a moderately overbasic overbasic salt, for example, an overbasic salt having a TBN of about 100 to about 250. In one embodiment, the TBN of a moderately overbasic salt may be about 100 to about 200. In another embodiment, the TBN of a moderately overbasic salt may be about 125 to about 175. An overbasic detergent may be a high-overbasic overbasic salt, for example, an overbasic salt having a TBN greater than 250. In one embodiment, the TBN of a high-overbasic salt may be about 250 to about 800 based on the active substance.

[0111] In one embodiment, the cleaning agent may be one or more alkali or alkaline earth metal salts of alkyl-substituted hydroxyaromatic carboxylic acids. Suitable hydroxyaromatic compounds include mononuclear monohydroxy and polyhydroxyaromatic hydrocarbons having 1 to 4, preferably 1 to 3, hydroxyl groups. Suitable hydroxyaromatic compounds include phenol, catechol, resorcinol, hydroquinone, pyrogallol, and cresol. A preferred hydroxyaromatic compound is phenol.

[0112] The alkyl-substituted moiety of the alkali or alkaline earth metal salt of the alkyl-substituted hydroxyaromatic carboxylic acid is derived from an alpha-olefin having about 10 to about 80 carbon atoms. The olefin used may be linear, isomerized linear, branched, or partially branched linear. The olefin may be a mixture of linear olefins, a mixture of isomerized linear olefins, a mixture of branched olefins, a mixture of partially branched linear olefins, or any of the aforementioned.

[0113] Anti-wear agent In one embodiment, the composition comprises one or more anti-wear agents. The anti-wear agents reduce wear on metal parts. Suitable anti-wear agents include dihydrocarbyl dithiophosphate metal salts such as zinc dihydrocarbyl dithiophosphate (ZDDP) of formula (C):

[0114] Zn[SP(=S)(OR 1 )(OR 2 )]2 formula C,

[0115] R in the formula 1 and R 2 R can be identical to different hydrocarbyl radicals having 1 to 18 (e.g., 2 to 12) carbon atoms, and includes radicals such as alkyl, alkenyl, aryl, arylalkyl, alkalil, and alicyclic radicals. 1 and R 2 Particularly preferred as the group are alkyl groups having 2 to 8 carbon atoms (for example, alkyl radicals may be ethyl, ≪-propyl, isopropyl, ≪-butyl, isobutyl, sec-butyl, ≪-pentyl, isopentyl, ≪-hexyl, isohexyl, 2-ethylhexyl). To obtain oil solubility, the total number of carbon atoms (i.e., R) 1 +R 2 ) is at least 5. Therefore, zinc dihydrocarbyl dithiophosphate may contain zinc dialkyldithiophosphate. Zinc dialkyldithiophosphate is primary zinc dialkyldithiophosphate, secondary zinc dialkyldithiophosphate, or a combination thereof. ZDDP may be present in amounts of 3% by weight or less of the composition (e.g., 0.1 to 1.5% by weight, or 0.5 to 1.25% by weight).

[0116] In certain embodiments, the total concentration of the anti-abrasion agent in the composition is in the range of about 5 to about 30 mM. In certain embodiments, the total concentration of dihydrocarbyl dithiophosphate in the composition is in the range of about 5 to about 30 mM. In certain embodiments, the composition contains zinc dihydrocarbyl dithiophosphate at a concentration of about 5 to about 30 mM, or about 10 to about 20 mM.

[0117] Antioxidant The compositions disclosed herein may comprise one or more antioxidants. Antioxidants reduce the tendency of mineral oils to degrade during use. Oxidative degradation can be demonstrated by sludge in the lubricating oil, by varnish-like deposits on metal surfaces, and by viscosity increases. Suitable antioxidants include hindered phenols, aromatic amines, hindered amines (also known as HALS (hindered amine light stabilizers)), and alkylphenols and alkalis, as well as their alkaline earth metal salts.

[0118] While there are many types of hindered amines used in this invention, three types are predominant: pyrimidines, piperidines, and stable nitroxide compounds. Many more are described in the book “Nitrones, Nitronates, and Nitroxides”, E. Breuer, et al, 1989, John Wiley & Sons, and in patents such as US9315760.

[0119] Hindered phenol antioxidants often contain secondary and / or tertiary butyl groups as sterically hindering groups. The phenol group may further be substituted with a hydrocarbyl group (typically linear or branched alkyl) and / or a crosslinking group that links to a second aromatic group. Examples of suitable hindered phenol antioxidants include 2,6-di-tert-butylphenol, 4-methyl-2,6-di-tert-butylphenol, 4-ethyl-2,6-di-tert-butylphenol, 4-propyl-2,6-di-tert-butylphenol, 4-butyl-2,6-di-tert-butylphenol, and 4-dodecyl-2,6-di-2,6-di-tert-butylphenol. Other useful hindered phenol antioxidants include 2,6-di-alkyl-phenolpropionic acid ester derivatives such as BASF's IRGANOX® L-135, as well as bis-phenol antioxidants such as 4,4'-bis(2,6-di-tert-butylphenol) and 4,4-methylenebis(2,6-di-tert-butylphenol).

[0120] Typical aromatic amine antioxidants have at least two aromatic groups directly bonded to one amine nitrogen. Typical aromatic amine antioxidants have at least six alkyl substituents. Specific examples of aromatic amine antioxidants useful herein include 4,4'-dioctyldiphenylamine, 4,4'-dinonyldiphenylamine, N-phenyl-1-naphthylamine, N-(4-tert-octylphenyl)-l-naphthylamine, and N-(4-octylphenyl)-1-naphthylamine. The antioxidant may be present in the composition at a concentration of 0.01 to 5% by weight (e.g., 0.1 to 2% by weight).

[0121] In certain embodiments, the composition comprises one or more antioxidants, for example, one or more amine-based (e.g., amine-containing) antioxidants. In certain embodiments, the amount of one or more antioxidants in the composition is in the range of about 0.01 to about 1% by weight of the total composition.

[0122] Friction modifier The compositions disclosed herein may comprise one or more friction modifiers, each comprising a hydrocarbyl polyalcohol, an amine, an amide, or an ester.

[0123] In some embodiments, the hydrocarbyl polyalcohol has the formula R(OH)x, where X is an integer from 2 to 6 and R is a hydrocarbyl group. In some embodiments, the hydrocarbyl polyalcohol is an alkyl polyalcohol or an alkenyl polyalcohol. In some embodiments, the hydrocarbyl polyalcohol is a diol. In some embodiments, the diol is a 1,2-diol. In some embodiments, the hydrocarbyl group or hydrocarbyl alcohol has 12 to 30, 14 to 20, or 16 to 18 carbon atoms.

[0124] In some embodiments, the hydrocarbyl polyalcohol is an alkane 1,2-diol or an alkene 1,2-diol, and the hydrocarbyl polyalcohol has 12 to 30 carbon atoms. In certain embodiments, the hydrocarbyl polyalcohol has 14 to 20 carbon atoms. In some embodiments, the hydrocarbyl polyalcohol is 1,2-hexadecanediol or 1,2-octadecanediol.

[0125] In some embodiments, the composition comprises two or more hydrocarbyl polyalcohols.

[0126] At least one hydrocarbyl polyalcohol is present in an amount of 0.01 to 5 weight percent of the oil composition. In some embodiments, at least one hydrocarbyl polyalcohol is present in an amount of 0.01 to 4, 0.01 to 3, 0.01 to 2, 0.01 to 1, 0.1 to 1, 0.3 to 0.8, 0.4 to 0.7, or 0.5 weight percent of the oil composition.

[0127] In certain embodiments, the composition comprises one or more friction modifiers, for example, one or more hydrocarbyl polyalcohols (e.g., hydrocarbyl polyalcohols such as C16-C18 diols). In certain embodiments, the amount of one or more friction modifiers in the composition is in the range of about 0.1 to about 5% by weight of the overall composition, for example, about 0.1 to about 2% by weight, about 0.1 to about 1% by weight, 0.3 to 2% by weight, or about 0.4 to about 0.7% by weight.

[0128] In a particular embodiment, the composition contains glycerol monooleate in an amount of about 0.1 to about 0.5% by weight of the total composition.

[0129] Foam inhibitor The compositions disclosed herein may comprise one or more antifoaming agents capable of disrupting bubbles in oil. Not limited examples of suitable antifoaming agents include silicone oils or polydimethylsiloxanes, fluorosilicones, alkoxylated fatty acids, polyethers (e.g., polyethylene glycol), branched-chain polyvinyl ethers, alkyl acrylate polymers, alkyl methacrylate polymers, polyalkoxyamines, and combinations thereof.

[0130] In certain embodiments, the composition comprises one or more anti-foaming agents, for example, one or more silicone anti-foaming agents. In certain embodiments, the amount of one or more anti-foaming agents in the composition is in the range of about 10 to about 500 ppm of the total composition, for example, about 10 to 300 ppm or 10 to 200 ppm.

[0131] Additional co-additives The compositions disclosed herein may also contain other conventional additives that can impart or improve any desired properties of the composition in which other conventional additives are dispersed or dissolved. Any additive known to those skilled in the art may be used in the compositions disclosed herein. Several suitable additives are described in Mortier et al., “Chemistry and Technology of Lubricants”, 2nd Edition, London, Springer, (1996) and Leslie R. Rudnick, “Lubricant Additives: Chemistry and Applications”, New York, Marcel Dekker (2003) (both of which are incorporated herein by reference). For example, compositions can be blended with antioxidants, anti-wear agents, cleaning agents such as metal cleaners, rust inhibitors, detarnishers, deemulsifiers, metal deactivators, friction modifiers, pour point depressants, foam inhibitors, cosolvents, corrosion inhibitors, ashless dispersants, multifunctional agents, dyes, extreme pressure agents, and mixtures thereof. A variety of additives are known and commercially available. These additives, or similar compounds thereof, may be used for the preparation of the compositions of this disclosure by conventional blending procedures.

[0132] In a particular embodiment, the composition contains a diluent oil in an amount of about 0.1 to about 1% by weight of the total composition.

[0133] In the preparation of the composition, it is common practice to introduce the additive in the form of a 10-100% by weight active ingredient concentrate in a hydrocarbon oil (e.g., mineral oil-based lubricant) or other suitable solvent. The concentrate may be diluted with 3-100 (e.g., 5-40) parts by weight of lubricant per 1 part by weight of additive package in the formation of the finished composition (e.g., tractor hydraulic fluid).

[0134] Each of the aforementioned additives, when used, is used in a functionally effective amount to impart the desired properties to the composition.

[0135] In general, the concentration of each additive in the composition, when used, may range from about 0.001% to about 20% by weight, about 0.01% to about 15% by weight, or about 0.1% to about 10% by weight, about 0.005% to about 5% by weight, or about 0.1% to about 2.5% by weight, based on the total weight of the composition. Furthermore, the total amount of additives in the composition may range from about 0.001% to about 20% by weight, about 0.01% to about 10% by weight, or about 0.1% to about 5% by weight, based on the total weight of the composition.

[0136] In certain embodiments, the composition does not contain phosphite compounds.

[0137] How to use The compositions described herein can be advantageously used in agricultural machinery, particularly in the presence of water or in humid environments, to improve brake noise reduction. Brake noise or brake chatter in agricultural machinery such as tractors can be reduced by applying the compositions described herein to the braking system of the agricultural machinery.

[0138] The compositions described herein can be advantageously used in agricultural machinery to improve frictional performance, particularly in the presence of water or in humid environments. The compositions maintain frictional performance for a longer period, especially in the presence of water or in humid environments.

[0139] The composition can be applied by any suitable means to gearboxes, power take-offs and clutches, rear axles, reduction gears, wet brakes, and hydraulic accessories to provide lubrication with improved noise reduction and / or friction performance.

[0140] In one embodiment, a method for reducing tractor brake noise includes applying a tractor hydraulic fluid composition described herein to a brake component or system within the tractor, and operating the tractor. In a particular embodiment, the tractor is operated in the presence of water or in a humid environment.

[0141] In one embodiment, a method for maintaining the friction performance of a tractor involves using a tractor hydraulic fluid composition described herein. Gearbox, power take-off and clutch(s), rear axle, reduction gear, wet brakes and hydraulic accessories, To apply to one or more components selected from the group consisting of, and including driving a tractor.

[0142] In certain embodiments, the tractor is operated in the presence of water or in a humid environment.

[0143] The following embodiments are provided to illustrate embodiments of the present invention, but are not intended to limit the invention to the specific embodiments described. Unless otherwise indicated, parts and percentages are all by weight. All numerical values ​​are approximate. Where a numerical range is given, it should be understood that embodiments outside the described range may still fall within the scope of the invention. Specific details described in each embodiment should not be construed as essential features of the invention. [Examples]

[0144] Exemplary and comparative tractor hydraulic fluid compositions

[0145] Exemplary tractor hydraulic fluid compositions were evaluated against comparative compositions using the JASO SAE #2 friction test and the wet clutch vibration resistance test. Three exemplary compositions (Examples 1-3) and four comparative compositions (Comparative Examples 1-4) were formulated using the components and base oils listed in Table 1 (common tractor hydraulic fluid additives may also be included in each sample at fixed concentrations). Exemplary phosphate esters or amine salts of phosphate esters include alkyl phosphate ester amine salts, alkyl (C12-C18) acidic phosphates, and oleyl acid phosphates. An exemplary dispersant is bissuccinimide dispersant. Each sample also contains equal amounts of commonly used THF additives such as detergents, anti-wear agents, antioxidants, friction modifiers, and anti-foaming agents.

[0146] [Table 2]

[0147] Example 1. Dynamic friction test and static friction test

[0148] Dynamic and static friction tests were performed using the compositions listed in Table 1 by SAE No. 2 tests in accordance with the "Test Method for Friction of Automobile and Automobile Automatic Transmission Fluids" (as defined in JASO M348.2002). The friction materials used for both tests were FZ127-24-Y12 and steel plate (FZ132-8Y2). The conditions for each test are shown below.

[0149] Dynamic friction measurement

[0150] Moment of inertia of the inertia disc: 0.343 kgm, oil temperature: 100°C.

[0151] Rotation speed: 3,600 rpm, surface pressure of friction plate: 785 MPa

[0152] Test cycle: 30 seconds / cycle, Number of tests: 5,000 cycles

[0153] Static friction measurement

[0154] Rotation speed: 0.7 rpm, oil temperature: 100°C.

[0155] Surface pressure of the friction plate: 785 MPa

[0156] Test period: 3 seconds after rotation begins

[0157] Test cycles: After 1, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 3000, 4000, and 5000 cycles.

[0158] measurement

[0159] Static friction coefficient (μs) at the maximum torque of 20 generated when rotation starts at 0.7 rpm.

[0160] Table 2 shows the minimum and maximum static friction coefficients for each composition.

[0161] [Table 3]

[0162] As shown in Table 2, the static friction results indicate that exemplary compositions containing a succinimide dispersant and a phosphate ester or amine salt of a phosphate ester provide enhanced frictional properties compared to comparative compositions that do not contain either the succinimide dispersant or the phosphate ester or amine salt of a phosphate ester.

[0163] Example 2. Wet clutch vibration resistance test

[0164] The vibration resistance durability of the composition was measured using a low-speed friction device in accordance with the "Road Vehicle Test Method for Vibration Resistance of Automatic Transmission Fluids" described in JASO M-349:2012. In this test, a positive value for the friction coefficient (dμ / dV) indicates vibration resistance. An outline of the test method is described below.

[0165] Test conditions

[0166] Friction material: Cellulose-based disc / steel plate

[0167] Oil amount: Approximately 150mL

[0168] Conditions

[0169] Surface pressure: 1 MPa

[0170] Oil temperature: 80℃

[0171] Sliding speed: 0.6 m / s

[0172] Sliding time: 30 minutes

[0173] The results are shown in Table 3.

[0174] [Table 4]

[0175] Table 3 shows that the exemplary compositions are more effective in reducing brake noise when water is present in greater amounts than in the comparative compositions.

[0176] The stick-slip phenomenon occurs when the coefficient of friction decreases as the sliding speed increases, and is known to cause brake noise.

[0177] For example, Comparative Examples 1-4 show negative differences between μ at 150 rpm and μ at 50 rpm under water contamination conditions. This means that the coefficient of friction decreased as the sliding speed increased, which means that brake noise is likely to occur.

[0178] On the other hand, Examples 1-3 show positive values ​​under water contamination conditions. This means that the coefficient of friction increased with increasing sliding speed. Based on these results, it is considered that brake noise is less likely to occur.

[0179] All documents described herein are incorporated herein by reference and, to the extent that they do not conflict with the foregoing, include any priority documents and / or test procedures. Although multiple forms of this disclosure have been illustrated and described, as is evident from the general descriptions and specific embodiments above, various modifications can be made without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not intended to be limited thereto.

[0180] For the sake of brevity, this specification explicitly discloses only certain ranges. However, a range from any lower limit may be combined with any upper limit to enumerate ranges not explicitly described, and similarly, a range from any lower limit may be combined with other arbitrary lower limits to enumerate ranges not explicitly described, and similarly, a range from any upper limit may be combined with other arbitrary upper limits to enumerate ranges not explicitly described. Furthermore, a range includes all points or individual values ​​between its endpoints, even if not explicitly listed. Thus, all points or individual values, combined with any other point or individual value, or any other lower or upper limit, may function as their own lower or upper limit, enumerating ranges not explicitly described.

[0181] Similarly, the term “comprising” is considered synonymous with the term “including.” Likewise, whenever there is a transitional phrase “comprising” before a composition, element, or group of elements, it is understood that the description of that composition, element, or group of elements also assumes the same composition or group of elements that is preceded by the transitional phrase “essentially consists of,” “consists of,” “selected from a group consisting of,” or “is,” and vice versa.

[0182] As used herein, the terms "a" and "the" are understood to include both singular and plural forms.

[0183] Various terms are defined above. To the extent that a term used in a claim is not defined above, the broadest definition given to that term by experts in the relevant art should be provided, as reflected in at least one printed publication or issued patent. Furthermore, all patents, test methods, and other documents cited in this application shall be fully incorporated by reference, to the extent that such disclosure does not conflict with this application and in all jurisdictions where such incorporation is permitted.

[0184] The above description of the Disclosure is illustrative and illustrative. Furthermore, while the Disclosure illustrates and describes only preferred embodiments, as stated above, the Disclosure is applicable in a variety of other combinations, modifications, and environments, and it should be understood that changes or modifications are possible within the scope of the concepts expressed herein to match the art or knowledge of the above teachings and / or related art. Although the above is directed toward embodiments of the Disclosure, other further embodiments of the Disclosure can be devised without departing from its basic scope, the scope of which will be determined by the claims that follow.

[0185] Where combinations, subsets, or groups of elements (for example, combinations of components in a composition or combinations of steps in a method) are disclosed, even if specific references to various individual and collective combinations and permutations of these elements are not explicitly disclosed, each is understood to be specifically intended and described herein.

[0186] The embodiments described herein are intended to further illustrate the best known modes for carrying out the invention and to enable those skilled in the art to utilize the disclosure with various modifications necessary for a particular use or application in such or other embodiments. Therefore, the description is not intended to limit the embodiments disclosed herein. Furthermore, the appended claims are intended to be interpreted as encompassing alternative embodiments.

Claims

1. A hydraulic fluid composition for a tractor, (i) Main amount of lubricating viscosity oil, (ii) one or more dispersants, and (iii) One or more phosphate esters or amine salts of phosphate esters The composition comprising the above.

2. The tractor hydraulic fluid composition according to claim 1, wherein the one or more dispersants include a succinimide dispersant.

3. The tractor hydraulic fluid composition according to claim 2, wherein the succinimide dispersant comprises a bissuccinimide dispersant.

4. The phosphate ester is a compound of formula 1: 【Chemistry 1】 In the formula, R １ , R ２ and R ３ each independently represents H, C ３ -C ３０ alkyl, or C ３ -C ３０ alkenyl, and at least one of R １ , R ２ and R ３ is not H, and the hydraulic working oil composition for a tractor according to claim 1, which is the compound.

5. The amine salt of the phosphate ester is the compound of formula 2: 【Chemistry 2】 In the formula, R １ and R ２ Each of these is H, C ３ ~C ３０ Alkyl and C ３ ~C ３０ Selected independently from Alkenil, and R １ and R ２ At least one of them is not H, and each R is H, C １ ~C ３０ Alkyl and C １ ~C ３０ The tractor hydraulic fluid composition according to claim 1, wherein the compound is independently selected from alkenyls.

6. The aforementioned ＋ NR ４ The hydraulic fluid composition for a tractor according to claim 5, wherein is a primary amine.

7. The hydraulic fluid composition for a tractor according to claim 1, further comprising one or more friction modifiers.

8. The hydraulic fluid composition for a tractor according to claim 7, wherein the one or more friction modifiers include a polyol or a polyol ester.

9. The tractor hydraulic fluid composition according to claim 1, wherein the amount of one or more dispersants in the composition is in the range of about 0.1 to about 5% by weight of the total composition.

10. The tractor hydraulic fluid composition according to claim 1, wherein the amount of one or more phosphate esters or amine salts of phosphate esters in the composition is in the range of about 0.1 to about 2% by weight of the total composition.

11. A method for reducing brake noise of a tractor, comprising applying the tractor hydraulic fluid composition according to claim 1 to a brake component or system of the tractor and operating the tractor.

12. The method according to claim 11, wherein the tractor is operated in the presence of water or in a humid environment.

13. The hydraulic fluid composition for a tractor according to claim 1, Gearbox, power take-off and clutch(s), rear axle, reduction gear, wet brakes and hydraulic accessories, To apply to one or more components selected from the group consisting of, and operating the tractor, A method for maintaining the friction performance of a tractor, including [specific component].

14. The method according to claim 13, wherein the tractor is operated in the presence of water or in a humid environment.

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