Hydraulic oil composition as well as preparation method and application thereof

Abstract

The invention relates to the field of lubricating oil, and discloses a hydraulic oil composition as well as a preparation method and application thereof. The hydraulic oil composition comprises boric acid ester, polyethylene glycol monomethyl ether, polyethylene glycol monobutyl ether, polyethylene glycol, polyethylene oxide polypropylene oxide monobutyl ether and optional auxiliaries. Wherein the weight ratio of the boric acid ester to the polyethylene glycol monomethyl ether to the polyethylene glycol monobutyl ether to the polyglycol to the polyethylene oxide polypropylene oxide monobutyl ether is (10-20): (1-6): (1-5): (0.5-4): 1. The hydraulic oil prepared from the composition provided by the invention has good high and low temperature performance, and also has excellent oxidation corrosion resistance and lubricating performance.

Description

Technical Field

[0001] The invention relates to the field of lubricating oil, and in particular to a hydraulic oil composition and a preparation method and application thereof. Background Art

[0002] The function of the vehicle hydraulic brake system is to stop or slow down the movement of the machine, and hydraulic oil is a functional liquid used to transmit pressure in the hydraulic brake system to stop the wheels from turning. With the development and update of automobile technology, modern brake systems have higher requirements for weight, efficiency, driving force, noise, safety and quick response. In order to meet the needs of modern brake systems, the performance requirements of the hydraulic oil used are also more stringent. For example, the selected hydraulic oil needs to have excellent high temperature performance, good lubrication performance, good corrosion resistance, and excellent high and low temperature performance.

[0003] At present, the hydraulic oil base oils on the market are mainly divided into mineral base oils, synthetic base oils and bio-base oils, and synthetic base oils are mainly divided into two categories: synthetic ester base oils and synthetic hydrocarbon base oils. Ester oils have excellent viscosity-temperature performance, good heat resistance, less coking and good oxidation stability, but poor compatibility with sealing materials and coatings, poor hydrolysis stability, and medium corrosion resistance. Synthetic hydrocarbon base oils have good high temperature resistance, good fluidity, high flash point and ignition point, but unstable viscosity-temperature performance, poor oxidation corrosion resistance and lubrication performance.

[0004] For example, CN109233954A discloses an energy-saving anti-wear hydraulic oil, which includes 100 parts of base oil, 1-10 parts of wear reducer, 0.5-5 parts of antioxidant, 0.1-0.5 parts of anti-foaming agent, 0.1-0.5 parts of anti-emulsifier, and 0.1-0.5 parts of four-arm PEG sulfhydryl group, wherein the base oil is ester synthetic oil and Class III mineral oil. The prepared hydraulic oil has good fluidity under low temperature conditions, a small viscosity difference between low and high temperatures, but poor corrosion resistance.

[0005] CN114763502A discloses a hydraulic oil composition and a preparation method thereof. The hydraulic oil composition is used as a reference and contains the following components in percentage by weight: 0.1-0.3 wt % of an extreme pressure anti-wear agent, 0.1-2 wt % of a demulsifier, 0.1-1.5 wt % of a friction modifier, 0.1-0.3 wt % of a detergent dispersant, 0.1-0.3 wt % of a preservative, 0.1-0.5 wt % of a pour point depressant, 0.005-0.035 wt % of an anti-foaming agent, and the remainder of a composite base oil, wherein the composite base oil is a composition of a coal-based base oil and a natural gas synthetic oil. The prepared hydraulic oil composition has good rubber compatibility, but poor wear resistance and anti-friction performance.

[0006] In summary, hydraulic oil needs to have good anti-oxidation and corrosion performance, lubrication performance, and high and low temperature performance to ensure the normal operation of the vehicle braking system. However, the current commercial synthetic hydraulic oil cannot fully meet the requirements, and a suitable product is urgently needed. Summary of the invention

[0007] The purpose of the present invention is to overcome the problem that the hydraulic oil in the prior art cannot have both anti-oxidation and corrosion performance and lubrication performance, and to provide a hydraulic oil composition and a preparation method thereof. The hydraulic oil prepared from the hydraulic oil composition of the present invention has excellent anti-oxidation and corrosion performance and lubrication performance, and also has good high and low temperature performance.

[0008] In order to achieve the above object, the present invention provides a hydraulic oil composition, characterized in that the hydraulic oil composition comprises: boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether and optional additives;

[0009] Wherein, the weight ratio of the boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyol and polyethylene oxide polypropylene oxide monobutyl ether is 10-20:1-6:1-5:0.5-4:1.

[0010] The second aspect of the present invention provides a method for preparing hydraulic oil, characterized in that the method comprises: mixing boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether and optional additives.

[0011] The third aspect of the present invention provides the use of the aforementioned boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether as base oils in improving the anti-oxidation and corrosion performance, high and low temperature performance and lubrication performance of hydraulic oil compositions.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects:

[0013] (1) The hydraulic oil of the present invention has good high and low temperature performance, good viscosity-temperature performance, and excellent stability, and provides good energy transmission, sealing, heat dissipation, and other functions for the vehicle hydraulic brake system.

[0014] (2) The hydraulic oil of the present invention has particularly excellent anti-oxidation and corrosion performance and lubrication performance, providing better lubrication and anti-corrosion functions for the vehicle hydraulic brake system, better meeting the use requirements of modern vehicle brake systems under harsh conditions, and providing protection for the operation of the brake system. DETAILED DESCRIPTION

[0015] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0016] The first aspect of the present invention provides a hydraulic oil composition, characterized in that the hydraulic oil composition comprises: boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether and optional additives;

[0017] Wherein, the weight ratio of the boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyol and polyethylene oxide polypropylene oxide monobutyl ether is 10-20:1-6:1-5:0.5-4:1.

[0018] Preferably, the weight ratio of the boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyol and polyethylene oxide polypropylene oxide monobutyl ether is 12-17:2-5:1.5-4:1-2:1.

[0019] According to some embodiments of the present invention, based on the total weight of the hydraulic oil composition, the total content of the borate ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether is 90 wt %-98.5 wt %.

[0020] Preferably, based on the total weight of the hydraulic oil composition, the total content of the borate ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether is 94wt%-97.5wt%.

[0021] According to some embodiments of the present invention, the borate ester has the structural formula:

[0022] R1-O-[(CH2CH2-O)] n -B, n is an integer ≥ 2, R1 is a C1-C4 alkyl group, preferably, n is an integer of 2-4, and the borate is selected from at least one of polyethylene glycol methyl ether borate, polyethylene glycol ethyl ether borate and polyethylene glycol butyl ether borate.

[0023] According to some embodiments of the present invention, the structural formula of the polyethylene glycol methyl ether is:

[0024] R2-O-(CH2CH2-O) m -H, m is an integer ≥ 2, R2 is methyl, and preferably, m is an integer of 2-4.

[0025] According to some embodiments of the present invention, the structural formula of the polyethylene glycol butyl ether is:

[0026] R3-O-(CH2CH2-O) p -H, p is an integer ≥ 2, R3 is n-butyl, and preferably, p is an integer of 2-4.

[0027] According to some embodiments of the present invention, the structural formula of the polyethylene glycol is: H-(O-CH2CH2) q -OH, q is an integer ≥ 2, preferably, q is an integer of 2-5, and the polyethylene glycol is at least one selected from diethylene glycol, triethylene glycol, polyethylene glycol 200 and polyethylene glycol 400;

[0028] According to some embodiments of the present invention, the structural formula of the polyethylene oxide polypropylene oxide monobutyl ether is: R4O-(CH2CH2-O) r -[CH2CH(CH3)-O] s -H, r and s are both integers other than 0, R4 is n-butyl, preferably, r is an integer of 3-6, and s is an integer of 4-7.

[0029] In the present invention, when the types and amounts of the boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyol and polyethylene oxide polypropylene oxide monobutyl ether meet the above ranges, the hydraulic oil composition has excellent high and low temperature performance and lubrication performance.

[0030] In the present invention, in order to further improve the anti-oxidation and corrosion performance, high and low temperature performance and lubrication performance of the hydraulic oil composition, the auxiliary agent includes at least one of a corrosion inhibitor, a metal passivator and a pH adjuster. Preferably, the auxiliary agent includes an antioxidant, a corrosion inhibitor, a metal passivator and a pH adjuster.

[0031] More preferably, based on the total weight of the hydraulic oil composition, the content of the antioxidant is 0.2wt%-4wt%, the content of the corrosion inhibitor is 0.03wt%-2.5wt%, the content of the metal passivator is 0.02wt%-1.0wt%, and the content of the pH adjuster is 1.25wt%-2.5wt%.

[0032] According to some embodiments of the present invention, the antioxidant is selected from at least one of organic phenol antioxidants, organic amine antioxidants, phosphite antioxidants and organic sulfur antioxidants. Preferably, the antioxidant is an organic phenol antioxidant and an organic sulfur antioxidant. More preferably, the weight ratio of the organic phenol antioxidant to the organic sulfur antioxidant is 1:1-3.

[0033] According to some embodiments of the present invention, the organic sulfur antioxidant is selected from at least one of dialkyl dithiocarbamate, dithiodipropionic acid and dialkyl thiodipropionic acid ester; the organic phenol antioxidant is selected from at least one of 2,6-di-tert-butyl-4-methylphenol, 2,2-di(4-hydroxyphenyl)propane and p-hydroxyanisole.

[0034] According to some embodiments of the present invention, the corrosion inhibitor is selected from at least one of sulfonates, fatty acids, fatty acid derivatives and complex phosphate compounds. Preferably, the corrosion inhibitor is selected from at least one of sodium dinonylnaphthalene sulfonate, dodecenylsuccinic acid, dodecenylsuccinic acid half ester and polyethylene glycol phosphate.

[0035] According to some embodiments of the present invention, the metal deactivator is selected from at least one of a benzotriazole derivative, a thiadiazole derivative and a purine. Preferably, the metal deactivator is a benzotriazole derivative and a thiadiazole derivative. More preferably, the weight ratio of the benzotriazole derivative to the thiadiazole derivative is 1-5:1.

[0036] According to some embodiments of the present invention, preferably, the benzotriazole derivative is selected from at least one of benzotriazole, methylbenzotriazole, 1,2,4-triazole and 1,2,3-triazole; and the thiadiazole derivative is selected from di(tert-dodecyldisulfide)-1,3,4-thiadiazole and / or dithiothiadiazole sodium salt.

[0037] According to some embodiments of the present invention, the pH adjuster is selected from at least one of organic amines and their derivatives. Preferably, the pH adjuster is selected from at least one of diethanolamine, triethanolamine, n-butylamine, methyldiethanolamine and tri-n-butylamine.

[0038] In the present invention, when the types and amounts of the antioxidant, corrosion inhibitor, metal passivator and pH adjuster meet the above ranges, the hydraulic oil composition has excellent anti-oxidation and corrosion performance.

[0039] The second aspect of the present invention provides a method for preparing hydraulic oil, characterized in that the method comprises: mixing boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether and optional additives.

[0040] In the present invention, there is no particular limitation on the mixing method of the boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol, polyethylene oxide polypropylene oxide monobutyl ether and the auxiliary agent, and any conventional mixing method in the art can be used.

[0041] According to some embodiments of the present invention, the mixing includes: a temperature of 90-130°C, a pressure of -0.099MPa to -0.90MPa, and a time of 0.5-5h. Preferably, the temperature is 100-110°C, the pressure is -0.092MPa to -0.95MPa, and the time is 1-2h.

[0042] The third aspect of the present invention provides the use of the aforementioned boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether as base oils in improving the anti-oxidation and corrosion performance, high and low temperature performance and lubrication performance of hydraulic oil compositions.

[0043] Unless otherwise specified, the pressures involved in the present invention are gauge pressures.

[0044] According to a particularly preferred embodiment of the present invention, the preparation method of the hydraulic oil composition comprises: mixing boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol, polyethylene oxide polypropylene oxide monobutyl ether, antioxidant, corrosion inhibitor, metal passivator and pH value adjuster, and stirring at 100-110° C. and a pressure of -0.092 MPa to -0.95 MPa to obtain the hydraulic oil composition;

[0045] Wherein, the weight ratio of the boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyol and polyethylene oxide polypropylene oxide monobutyl ether is 12-17:2-5:1.5-4:1-2:1.

[0046] The hydraulic oil composition obtained according to this preferred embodiment has good high and low temperature performance, and also has excellent anti-oxidation and corrosion performance and lubrication performance.

[0047] Example

[0048] In order to further illustrate the present invention, the following examples are provided for detailed description.

[0049] In the following examples of the present invention, unless otherwise specified, all raw materials are commercially available.

[0050] Example 1

[0051] This example is used to illustrate the preparation of a hydraulic oil composition using the method described in the present invention, which comprises: mixing boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol, polyethylene oxide polypropylene oxide monobutyl ether, antioxidant, corrosion inhibitor, metal passivator and pH value adjuster, stirring evenly, and dehydrating at 105° C. and -0.095 MPa for 1.5 h to obtain the hydraulic oil composition A1, and the types and amounts of each raw material are shown in Table 1;

[0052] Among them, the structural formulas of the polyethylene glycol methyl ether, polyethylene glycol butyl ether and polyethylene oxide polypropylene oxide monobutyl ether are CH3-O-(CH2CH2-O)3-H, CH3(CH2)3-O-(CH2CH2-O)3-H, and CH3(CH2)3O-(CH2CH2-O)6-[CH2CH(CH3)-O]7-H, respectively.

[0053] Example 2

[0054] This example is used to illustrate the preparation of hydraulic oil by the method described in the present invention, which comprises: mixing boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol, polyethylene oxide polypropylene oxide monobutyl ether, antioxidant, corrosion inhibitor, metal passivator and pH value adjuster, stirring evenly, dehydrating at 100° C. and -0.092 MPa for 1 hour to obtain the hydraulic oil composition A2, and the types and amounts of each raw material are shown in Table 1;

[0055] Among them, the structural formulas of the polyethylene glycol methyl ether, polyethylene glycol butyl ether and polyethylene oxide polypropylene oxide monobutyl ether are CH3-O-(CH2CH2-O)2-H, CH3(CH2)3-O-(CH2CH2-O)2-H, and CH3(CH2)3O-(CH2CH2-O)3-[CH2CH(CH3)-O]7-H, respectively.

[0056] Example 3

[0057] This example is used to illustrate the preparation of hydraulic oil by the method of the present invention, which comprises: mixing boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol, polyethylene oxide polypropylene oxide monobutyl ether, antioxidant, corrosion inhibitor, metal passivator and pH value adjuster, stirring evenly, dehydrating at 110° C. and -0.095 MPa for 2 hours to obtain the hydraulic oil composition A3, and the types and amounts of each raw material are shown in Table 1;

[0058] Among them, the structural formulas of the polyethylene glycol methyl ether, polyethylene glycol butyl ether and polyethylene oxide polypropylene oxide monobutyl ether are CH3-O-(CH2CH2-O)2-H, CH3(CH2)3-O-(CH2CH2-O)4-H, and CH3(CH2)3O-(CH2CH2-O)6-[CH2CH(CH3)-O]4-H, respectively.

[0059] Example 4

[0060] A hydraulic oil composition was prepared according to the method of Example 1, except that the amount of each raw material was as shown in Table 1, to obtain the hydraulic oil composition A4.

[0061] Example 5

[0062] A hydraulic oil composition was prepared according to the method of Example 1, except that the antioxidant was diphenylamine. Other conditions were the same, and a hydraulic oil composition A5 was prepared.

[0063] Example 6

[0064] A hydraulic oil composition was prepared according to the method of Example 1, except that the metal passivator was adenine. Other conditions were the same, and a hydraulic oil composition A6 was prepared.

[0065] Example 7

[0066] A hydraulic oil composition was prepared according to the method of Example 1, except that the weight ratio of the phenolic antioxidant to the organic sulfur antioxidant was 2.5:1. Other conditions were the same, and a hydraulic oil composition A7 was prepared.

[0067] Example 8

[0068] A hydraulic oil composition was prepared according to the method of Example 1, except that the weight ratio of the benzotriazole derivative to the thiadiazole derivative was 9:1. Other conditions were the same, and a hydraulic oil composition A8 was prepared.

[0069] Comparative Example 1-2

[0070] The hydraulic oil composition was prepared according to the method of Example 1, except that the amount of each raw material was as shown in Table 1, to obtain the hydraulic oil composition D1-D2.

[0071] Comparative Example 3

[0072] Hydraulic oil was prepared according to the method of Example 1, except that boric acid ester was replaced by sebacic acid ester. Other conditions were the same, and hydraulic oil composition D3 was prepared.

[0073] Comparative Example 4

[0074] Hydraulic oil was prepared according to the method of Example 1, except that polyethylene oxide polypropylene oxide monobutyl ether was replaced by polyalkylene trihydroxy ether, and other conditions were the same to prepare hydraulic oil composition D4.

[0075] Comparative Example 5

[0076] Hydraulic oil was prepared according to the method of Example 1, except that polyethylene glycol methyl ether was replaced by polyethylene glycol ethyl ether, and other conditions were the same, to prepare a hydraulic oil composition D5.

[0077] Comparative Example 6

[0078] Hydraulic oil was prepared according to the method of Example 1, except that polyethylene glycol butyl ether was replaced by polyethylene glycol glycerol ether. Other conditions were the same, and hydraulic oil composition D6 was prepared.

[0079] Comparative Example 7

[0080] Hydraulic oil was prepared according to the method of Example 1, except that polyethylene glycol was replaced by glycerol. Other conditions were the same, and hydraulic oil composition D7 was prepared.

[0081] Comparative Example 8

[0082] Hydraulic oil was prepared according to the method of Example 1, except that the amounts of borate, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol, and polyethylene oxide polypropylene oxide monobutyl ether were different, specifically 56.8 g borate, 18.4 g polyethylene glycol methyl ether, 13.2 g polyethylene glycol butyl ether, 6.6 g polyethylene glycol, and 2.42 g polyethylene oxide polypropylene oxide monobutyl ether, and the other conditions were the same to prepare a hydraulic oil composition D8.

[0083] Test Case

[0084] Various properties of the hydraulic oil compositions prepared in the examples and comparative examples were tested, and the test results are shown in Tables 1 to 4.

[0085] The low temperature kinematic viscosity of hydraulic oil is measured according to GB / T 265 method, instrument model ST-1506.

[0086] The equilibrium reflux boiling point of hydraulic oil is determined according to SH / T 0430 method, instrument model JF0430.

[0087] The wet equilibrium reflux boiling point of hydraulic oil is determined according to the method in Appendix C of GB 12981, and the instrument model is JF0430.

[0088] The stability test of hydraulic oil is carried out in accordance with SH / T 0091 method, and the instrument model is AT-710B.

[0089] The mass change of different metal sheets after oxidative corrosion of hydraulic oil (100℃×240h, 100mL / min air) was measured according to SH / T 0450 method, and the instrument model was FDH-3001.

[0090] The friction coefficient of hydraulic oil is measured according to ASTM G99 method, instrument model UFW 200.

[0091] Table 1

[0092]

[0093]

[0094] Table 2

[0095]

[0096]

[0097] Table 3

[0098]

[0099]

[0100] Table 4

[0101]

[0102] According to the data in Tables 1-4, it can be seen that, compared with Comparative Examples 1-2, Example 1 changes the amount of each substance in the hydraulic oil composition, the equilibrium reflux boiling point and the wet equilibrium reflux boiling point decrease, the reserve alkalinity change value increases, the mass change of brass and copper after oxidative corrosion increases, and the friction coefficient increases slightly, resulting in the deterioration of the low temperature performance, anti-oxidation corrosion performance and lubrication performance of the hydraulic oil composition; Compared with Comparative Example 3, Example 1 replaces the boric acid ester with sebacic acid ester, the wet equilibrium reflux boiling point decreases, the mass change of brass and copper after oxidative corrosion increases, resulting in the deterioration of the high temperature performance and anti-oxidation corrosion performance of the hydraulic oil composition; Compared with Comparative Example 4, Example 1 replaces polyethylene oxide polypropylene oxide monobutyl ether with polyalkylene trihydroxy ether, the friction coefficient increases, resulting in the deterioration of the lubrication performance of the hydraulic oil composition; Compared with Comparative Example 5, Example 1 replaces polyethylene glycol methyl ether with polyethylene glycol ethyl ether, the reserve alkalinity change value increases, the mass change of brass and copper after oxidative corrosion increases, and the friction coefficient increases slightly. High, resulting in poor oxidation corrosion resistance and lubrication performance of the hydraulic oil composition; compared with comparative example 6, in Example 1, polyethylene glycol butyl ether is replaced by polyethylene glycol glycerol ether, the reserve alkalinity change value is increased, the mass change of brass and copper after oxidative corrosion is increased, and the friction coefficient is slightly increased, resulting in poor oxidation corrosion resistance and lubrication performance of the hydraulic oil composition; compared with comparative example 7, in Example 1, polyethylene glycol is replaced by glycerol, the reserve alkalinity change value is increased, the mass change of brass and copper after oxidative corrosion is increased, and the friction coefficient is slightly increased, resulting in poor oxidation corrosion resistance and lubrication performance of the hydraulic oil composition; compared with comparative example 8, in Example 1, the weight ratio of borate, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol, and polyethylene oxide polypropylene oxide monobutyl ether is not within the range defined by the present invention, the reserve alkalinity change value is increased, the mass change of brass and copper after oxidative corrosion is increased, and the friction coefficient is slightly increased, resulting in poor oxidation corrosion resistance and lubrication performance of the hydraulic oil composition.

[0103] In summary, the hydraulic oil prepared using the composition of the present invention has good high and low temperature performance, as well as excellent anti-oxidation corrosion performance and lubrication performance, providing good heat dissipation, lubrication and anti-corrosion functions for the vehicle hydraulic brake system, better meeting the use requirements of modern vehicle brake systems under harsh conditions, and providing protection for the operation of the brake system.

[0104] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A hydraulic oil composition, characterized in that: The hydraulic oil composition comprises: borate, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether and optional auxiliary agents; Wherein, the weight ratio of the borate ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyol and polyethylene oxide polypropylene oxide monobutyl ether is 10-20:1-6:1-5:0.5-4:1, preferably 12-17:2-5:1.5-4:1-2:

1.

2. The hydraulic oil composition according to claim 1, wherein Based on the total weight of the hydraulic oil composition, the total content of the borate, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether is 90wt%-98.5wt%, preferably 94wt%-97.5wt%.

3. The hydraulic oil composition according to claim 1 or 2, wherein: The structural formula of the boric acid ester is: R1-O-[(CH2CH2-O)] n -B, n is an integer ≥ 2, preferably an integer of 2-4, R1 is a C1-C4 alkyl group, preferably at least one selected from polyethylene glycol methyl ether borate, polyethylene glycol ethyl ether borate and polyethylene glycol butyl ether borate; And / or, the structural formula of the polyethylene glycol methyl ether is: R2-O-(CH2CH2-O) m -H, m is an integer ≥ 2, preferably an integer from 2 to 4, and R2 is a methyl group; And / or, the structural formula of the polyethylene glycol butyl ether is: R3-O-(CH2CH2-O) p -H, p is an integer ≥ 2, preferably an integer from 2 to 4, and R3 is n-butyl; And / or, the structural formula of the polyethylene glycol is: H-(O-CH2CH2) q -OH, q is an integer ≥ 2, preferably an integer of 2-5, preferably at least one selected from diethylene glycol, triethylene glycol, polyethylene glycol 200 and polyethylene glycol 400; And / or, the structural formula of the polyethylene oxide polypropylene oxide monobutyl ether is: R4O-(CH2CH2-O) r -[CH2CH(CH3)-O] s -H, r and s are both integers other than 0, preferably r is an integer of 3-6, s is an integer of 4-7, and R4 is n-butyl.

4. The hydraulic oil composition according to claim 1, wherein: The auxiliary agent includes at least one of an antioxidant, a corrosion inhibitor, a metal passivator and a pH adjuster; Preferably, the additives include antioxidants, corrosion inhibitors, metal passivators and pH regulators; More preferably, based on the total weight of the hydraulic oil composition, the content of the antioxidant is 0.2wt%-4wt%, the content of the corrosion inhibitor is 0.03wt%-2.5wt%, the content of the metal passivator is 0.02wt%-1.0wt%, and the content of the pH adjuster is 1.25wt%-2.5wt%.

5. The hydraulic oil composition according to claim 4, wherein: The antioxidant is selected from at least one of an organic phenol antioxidant, an organic amine antioxidant, a phosphite antioxidant and an organic sulfur antioxidant; and / or, the corrosion inhibitor is selected from at least one of sulfonates, fatty acids, fatty acid derivatives and complex phosphate compounds; and / or, the metal deactivator is selected from at least one of benzotriazole derivatives, thiadiazole derivatives and purine; And / or, the pH adjuster is at least one selected from organic amines and their derivatives.

6. The hydraulic oil composition according to claim 5, wherein: The antioxidants are organic phenol antioxidants and organic sulfur antioxidants; Preferably, the weight ratio of the organic phenol antioxidant to the organic sulfur antioxidant is 1:1-3; and / or, the metal deactivator is a benzotriazole derivative and a thiadiazole derivative; Preferably, the weight ratio of the benzotriazole derivative to the thiadiazole derivative is 1-5:

1.

7. The hydraulic oil composition according to claim 6, wherein: The organic sulfur antioxidant is selected from at least one of dialkyl dithiocarbamate, dithiodipropionic acid and dialkyl thiodipropionic acid; And / or, the organic phenol antioxidant is selected from at least one of 2,6-di-tert-butyl-4-methylphenol, 2,2-bis(4-hydroxyphenyl)propane and p-hydroxyanisole; and / or, the corrosion inhibitor is selected from at least one of sodium dinonylnaphthalene sulfonate, dodecenylsuccinic acid, dodecenylsuccinic acid half ester and polyethylene glycol phosphate; and / or, the benzotriazole derivative is selected from at least one of benzotriazole, methylbenzotriazole, 1,2,4-triazole and 1,2,3-triazole; the thiadiazole derivative is selected from di(tert-dodecyldithio)-1,3,4-thiadiazole and / or dithiothiadiazole sodium salt; And / or, the pH adjuster is at least one selected from diethanolamine, triethanolamine, n-butylamine, methyldiethanolamine and tri-n-butylamine.

8. A method for preparing the hydraulic oil composition according to any one of claims 1 to 7, characterized in that: The method comprises: mixing boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol, polyethylene oxide polypropylene oxide monobutyl ether and optional auxiliary agents.

9. The method according to claim 8, wherein: The mixing includes: a temperature of 90-130° C., a pressure of -0.099 MPa to -0.90 MPa, and a time of 0.5-5 h, and preferably includes: a temperature of 100-110° C., a pressure of -0.092 MPa to -0.95 MPa, and a time of 1-2 h.

10. Use of the boric acid ester, polyethylene glycol methyl ether, polyethylene glycol butyl ether, polyethylene glycol and polyethylene oxide polypropylene oxide monobutyl ether as claimed in any one of claims 1 to 7 as base oil for improving the anti-oxidation and corrosion performance, high and low temperature performance and lubrication performance of a hydraulic oil composition.

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