Lubricating oil as well as preparation method and application thereof

Abstract

The invention relates to the technical field of lubricating oil, and discloses lubricating oil as well as a preparation method and application thereof. The lubricating oil comprises base oil and an additive, wherein on the basis of the total weight of the base oil, the base oil is prepared from the following components in percentage by weight: 30 to 60 percent of boric acid ester, 20 to 40 percent of polyethylene glycol ether and 20 to 30 percent of polyethylene glycol; the additives comprise 0.05 to 5 weight percent of an antioxidant, 0.05 to 2 weight percent of a corrosion inhibitor, 0.05 to 1 weight percent of a copper corrosion inhibitor and 0.05 to 2 weight percent of an anti-wear reagent at extreme pressure. The lubricating oil has excellent high-temperature performance, low-temperature fluidity, aging resistance, wear resistance, corrosion resistance and shear stability, and can meet the use requirements of a hydraulic system with a suspension damping system and a brake system sharing liquid by controlling the cleanliness and the anti-foaming performance; good pressure transmission, anti-corrosion, cooling, lubricating and other effects are provided for the hydraulic system, and safe and effective operation of the system is guaranteed.

Description

Technical Field

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

[0002] The integrated suspension and brake system in the car can save space and improve the utilization rate of the auxiliary device. It is suitable for smart cars, new energy vehicles or traditional cars. By allowing the suspension system and the brake system to share the same hydraulic auxiliary system, the number of auxiliary devices in the whole vehicle can be saved, significantly reducing costs. At the same time, after integrating the suspension system and the brake system, the number of hydraulic pipelines can be reduced, the layout of the brake system and the suspension system can be facilitated, and the space of the chassis can be saved. In addition, the integrated system can be set with only one controller, which is beneficial to the vertical, longitudinal and lateral integrated control of the vehicle and improves the dynamic performance of the vehicle.

[0003] The solution for the suspension and brake system fluid must take into account the requirements of the working conditions. It requires not only good high temperature performance and anti-aging performance, but also shear stability, cleanliness and anti-foaming properties to ensure safe and effective operation of the system. However, the current commercial lubricants cannot fully meet the requirements, and a suitable product is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem that the high temperature performance, low temperature fluidity, anti-aging performance, anti-wear performance, corrosion resistance, shear stability, cleanliness and anti-foaming performance of lubricating oil in the prior art cannot be achieved at the same time, and to provide a lubricating oil and a preparation method and application thereof. The lubricating oil prepared from the base oil and additives has excellent high temperature performance, low temperature fluidity, anti-aging performance, anti-wear performance, corrosion resistance, shear stability, cleanliness and anti-foaming performance.

[0005] In order to achieve the above object, the first aspect of the present invention provides a lubricating oil, wherein the lubricating oil comprises a base oil and an additive; wherein, based on the total weight of the base oil, the base oil comprises: 30-60wt% of borate ester, 20-40wt% of polyethylene glycol ether and 20-30wt% of polyethylene glycol;

[0006] The additives include: 0.05-5wt% antioxidant, 0.05-2wt% corrosion inhibitor, 0.05-1wt% copper corrosion inhibitor and 0.05-2wt% extreme pressure anti-wear agent.

[0007] A second aspect of the present invention provides a method for preparing a lubricating oil, wherein, under heating and vacuum conditions, boric acid ester, polyglycol ether and polyethylene glycol are first blended to obtain a base oil;

[0008] Then, the base oil, antioxidant, corrosion inhibitor, copper corrosion inhibitor and extreme pressure anti-wear agent are blended for the second time and cooled to obtain lubricating oil.

[0009] The third aspect of the present invention provides lubricating oil obtained by the above preparation method.

[0010] A fourth aspect of the present invention provides the use of the above-mentioned lubricating oil in a suspension shock absorbing system and a braking system.

[0011] Compared with the prior art, the present invention has at least the following beneficial effects:

[0012] The lubricating oil of the present invention has excellent high-temperature performance, low-temperature fluidity, anti-aging performance, anti-wear performance, anti-corrosion and shear stability. By controlling the cleanliness and anti-foaming performance, it can meet the use requirements of the hydraulic system of the suspension shock absorption system and the brake system, provide the hydraulic system with good pressure transmission, corrosion protection, cooling, lubrication and other functions, and ensure the safe and effective operation of the system. DETAILED DESCRIPTION

[0013] 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.

[0014] A first aspect of the present invention provides a lubricating oil, wherein the lubricating oil comprises a base oil and an additive; wherein, based on the total weight of the base oil, the base oil comprises: 30-60 wt% of borate ester, 20-40 wt% of polyethylene glycol ether and 20-30 wt% of polyethylene glycol;

[0015] The additives include: 0.05-5wt% antioxidant, 0.05-2wt% corrosion inhibitor, 0.05-1wt% copper corrosion inhibitor and 0.05-2wt% extreme pressure anti-wear agent.

[0016] In the present invention, when the amount of each component in the lubricating oil meets the above range, a better overall interaction can be achieved, so that the lubricating oil has excellent high temperature performance, low temperature fluidity, anti-aging performance, anti-wear performance, anti-corrosion, shear stability, cleanliness and anti-foaming performance.

[0017] Further, based on the total weight of the base oil, the base oil comprises: 38-52 wt% of borate ester, 25-35 wt% of polyethylene glycol ether and 23-27 wt% of polyethylene glycol;

[0018] The additives include: 0.1-3.5 wt% antioxidant, 0.5-1.5 wt% corrosion inhibitor, 0.1-0.7 wt% copper corrosion inhibitor and 0.05-1.5 wt% extreme pressure anti-wear agent.

[0019] According to the present invention, the borate ester is selected from at least one of triethylene glycol methyl ether borate, polyethylene glycol methyl ether borate, triethylene glycol ethyl ether borate, triethylene glycol butyl ether borate and polyethylene glycol butyl ether borate.

[0020] In the present invention, the poly(ethylene glycol) methyl ether borate is a mixture of diethylene glycol methyl ether borate, triethylene glycol methyl ether borate, tetraethylene glycol methyl ether borate and pentaethylene glycol methyl ether borate.

[0021] In the present invention, the poly(ethylene glycol) butyl ether borate is a mixture of di(ethylene glycol) butyl ether borate, tri(ethylene glycol) butyl ether borate, tetra(ethylene glycol) butyl ether borate and penta(ethylene glycol) butyl ether borate.

[0022] Specifically, there is no particular requirement for the ratio between the species in the mixture, as long as the total amount of the species in the mixture meets the definition of the present invention.

[0023] According to the present invention, the antioxidant is selected from at least one of bisphenol A, 2,6-di-tert-butyl-p-cresol (T501) and p-hydroxyanisole.

[0024] According to the present invention, the corrosion inhibitor is selected from at least one of n-butylamine, diethanolamine ether and diisopropanolamine.

[0025] According to the present invention, the copper corrosion inhibitor is at least one selected from tolyltriazole, benzotriazole (T706) and 1,2,4-triazole.

[0026] According to the present invention, the extreme pressure anti-wear agent is selected from at least one of ethyl hexyl ether phosphate (PEG-5), phenol polyoxyethylene ether phosphate and castor oil polyoxyethylene ether (EL-40).

[0027] According to the present invention, the polyethylene glycol ether is at least one selected from triethylene glycol methyl ether, polyethylene glycol methyl ether, triethylene glycol butyl ether and polyethylene glycol butyl ether.

[0028] In the present invention, the polyglycol methyl ether is a mixture of diethylene glycol methyl ether, triethylene glycol methyl ether, tetraethylene glycol methyl ether and pentaethylene glycol methyl ether.

[0029] In the present invention, the polyethylene glycol butyl ether is a mixture of diethylene glycol butyl ether, triethylene glycol butyl ether, tetraethylene glycol butyl ether and pentaethylene glycol butyl ether.

[0030] Specifically, there is no particular requirement for the ratio between the species in the mixture, as long as the total amount of the species in the mixture meets the definition of the present invention.

[0031] According to the present invention, the polyethylene glycol is selected from at least one of triethylene glycol, PEG200 and PEG300.

[0032] A second aspect of the present invention provides a method for preparing a lubricating oil, wherein, under heating and vacuum conditions, boric acid ester, polyglycol ether and polyethylene glycol are first blended to obtain a base oil;

[0033] Then, the base oil, antioxidant, corrosion inhibitor, copper corrosion inhibitor and extreme pressure anti-wear agent are blended for the second time and cooled to obtain lubricating oil.

[0034] According to the present invention, the heating and vacuuming conditions include: a vacuum degree of -0.09 to -0.098 MPa, and a heating temperature of 80-140°C; preferably, a vacuum degree of -0.092 to -0.096 MPa, and a heating temperature of 100-130°C.

[0035] According to the present invention, the conditions for the first blending include: the first blending time is 1-6 hours, and the first blending speed is 200-800 rpm.

[0036] According to the present invention, the conditions for the first blending include: the first blending time is 2-4 hours, and the first blending speed is 300-600 rpm.

[0037] According to the present invention, the conditions for the second blending include: the second blending time is 0.5-2h, the second blending speed is 200-800rpm, and the second blending temperature is 50-100°C.

[0038] According to the present invention, the conditions for the second blending include: the second blending time is 1-1.5h, the second blending speed is 300-600rpm, and the second blending temperature is 60-80°C.

[0039] The third aspect of the present invention provides a lubricating oil prepared by the above preparation method, which has excellent high temperature performance, low temperature fluidity, anti-aging performance, anti-wear performance, anti-corrosion, shear stability, cleanliness and anti-foaming performance.

[0040] A fourth aspect of the present invention provides the use of the above-mentioned lubricating oil in a suspension shock absorbing system and a braking system.

[0041] The present invention will be described in detail below by way of examples. In the following examples,

[0042] The equilibrium reflux boiling point of lubricating oil is determined according to the NB / SH / T 0430 method;

[0043] The wet boiling point of lubricating oil is determined according to the method in Appendix C of GB12981;

[0044] The kinematic viscosity of lubricating oil is measured according to GB / T 265 method;

[0045] The anti-oxidation property of lubricating oil is determined according to the method in Appendix J of GB12981;

[0046] The maximum non-seizure load PB of lubricating oil is measured according to GB / T 3142 method;

[0047] The wear spot diameter of lubricating oil is measured according to SH / T 0189 method;

[0048] The corrosiveness of lubricating oil is determined according to the method in Appendix F of GB12981;

[0049] The shear resistance of lubricating oil is measured according to SH / T 0505 method;

[0050] The cleanliness of lubricating oil is determined according to DL / T 432 method;

[0051] The anti-foaming performance of lubricating oil is determined according to the GB / T 12579 method;

[0052] The raw materials used in the examples and comparative examples are all commercially available.

[0053] Example 1

[0054] Under heating and vacuum conditions, the boric acid ester, the polyglycol ether and the polyglycol are first blended to obtain a base oil;

[0055] Then, the base oil, antioxidant, corrosion inhibitor, copper corrosion inhibitor and extreme pressure anti-wear agent are blended for the second time and cooled to obtain lubricating oil.

[0056] Among them, the borate is 45wt%, the polyethylene glycol ether is 30wt%, the polyethylene glycol is 25wt%, the antioxidant is 2wt%, the corrosion inhibitor is 1wt%, the copper corrosion inhibitor is 0.5wt% and the extreme pressure anti-wear agent is 1wt%, at a temperature of 120°C and a vacuum degree of -0.094MPa, the first blending rate is 365rpm, the first blending time is 3h, the second blending rate is 365rpm, the second blending time is 1.2h, and the second blending temperature is 70°C, to obtain lubricating oil A1.

[0057] Embodiment 2-5

[0058] Lubricating oil was prepared according to the method of Example 1, except that: the types and amounts of the raw materials in the lubricating oil were different from those in Example 1, as shown in Table 1; the heating temperature, vacuum degree of evacuation and blending conditions were different from those in Example 1, as shown in Table 1. Lubricating oils A2-A5 were prepared respectively.

[0059] Comparative Examples 1-3

[0060] Lubricating oil was prepared according to the method of Example 1, except that: the types and amounts of the raw materials in the lubricating oil were different from those in Example 1, as shown in Table 1; the heating temperature, vacuum degree of evacuation and blending conditions were different from those in Example 1, as shown in Table 1. Lubricating oils D1-D3 were prepared respectively.

[0061] The various properties of the lubricating oils prepared in the examples and comparative examples were tested, and the test results are shown in Table 2.

[0062] Table 1

[0063]

[0064]

[0065] Table 1 (continued)

[0066]

[0067]

[0068] Table 2

[0069]

[0070]

[0071]

[0072] Table 2 (continued)

[0073]

[0074]

[0075] From the above examples, comparative examples and the data in Tables 1-2, it can be seen that the lubricating oil prepared by the present invention has an equilibrium reflux boiling point of 282-295°C, a wet boiling point of 183-190°C, and a kinematic viscosity of 2.796-3.048 mm at 100°C. 2 / s, -40℃ kinematic viscosity 1435-1460mm 2 / s, maximum non-seizure load 552-569N, wear spot diameter 0.55-0.58mm, 40℃ kinematic viscosity decrease rate 1.54-1.83%, cleanliness level 7-8, foaming property 0 / 0-10 / 0, excellent oxidation resistance, corrosion resistance and anti-foaming performance.

[0076] In summary, the lubricating oil of the present invention has excellent high-temperature performance, low-temperature fluidity, anti-aging performance, anti-wear performance, anti-corrosion and shear stability. By controlling the cleanliness and anti-foaming performance, it can meet the use requirements of the hydraulic system of the suspension shock absorption system and the braking system, and provide the hydraulic system with good pressure transmission, anti-corrosion, cooling, lubrication and other functions, thereby ensuring the safe and efficient operation of the system.

[0077] 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 lubricating oil, characterized in that: The lubricating oil comprises a base oil and an additive; wherein, based on the total weight of the base oil, the base oil comprises: 30-60 wt % of borate ester, 20-40 wt % of polyethylene glycol ether and 20-30 wt % of polyethylene glycol; The additives include: 0.05-5wt% antioxidant, 0.05-2wt% corrosion inhibitor, 0.05-1wt% copper corrosion inhibitor and 0.05-2wt% extreme pressure anti-wear agent.

2. The lubricating oil according to claim 1, characterized in that Based on the total weight of the base oil, the base oil comprises: 38-52 wt % of borate ester, 25-35 wt % of polyethylene glycol ether and 23-27 wt % of polyethylene glycol; The additives include: 0.1-3.5 wt% antioxidant, 0.5-1.5 wt% corrosion inhibitor, 0.1-0.7 wt% copper corrosion inhibitor and 0.05-1.5 wt% extreme pressure anti-wear agent.

3. The lubricating oil according to claim 1 or 2, characterized in that: The borate ester is selected from at least one of triethylene glycol methyl ether borate, polyethylene glycol methyl ether borate, triethylene glycol ethyl ether borate, triethylene glycol butyl ether borate and polyethylene glycol butyl ether borate; Preferably, the antioxidant is selected from at least one of bisphenol A, 2,6-di-tert-butyl-p-cresol and p-hydroxyanisole; Preferably, the corrosion inhibitor is selected from at least one of n-butylamine, diethanolamine ether and diisopropanolamine; Preferably, the copper corrosion inhibitor is selected from at least one of tolyltriazole, benzotriazole and 1,2,4-triazole; Preferably, the extreme pressure anti-wear agent is selected from at least one of ethyl hexyl ether phosphate, phenol polyoxyethylene ether phosphate and castor oil polyoxyethylene ether.

4. The lubricating oil according to any one of claims 1 to 3, characterized in that: The polyethylene glycol ether is selected from at least one of triethylene glycol methyl ether, polyethylene glycol methyl ether, triethylene glycol butyl ether and polyethylene glycol butyl ether; Preferably, the polyethylene glycol is selected from at least one of triethylene glycol, PEG200 and PEG300.

5. A method for preparing lubricating oil, characterized in that: The method comprises the following steps: Under heating and vacuum conditions, the boric acid ester, the polyethylene glycol ether and the polyethylene glycol are first blended to obtain a base oil; Then, the base oil, antioxidant, corrosion inhibitor, copper corrosion inhibitor and extreme pressure anti-wear agent are blended for the second time and cooled to obtain lubricating oil.

6. The preparation method according to claim 5, characterized in that: Based on the total weight of the base oil, 30-60wt% of borate, 20-40wt% of polyethylene glycol ether and 20-30wt% of polyethylene glycol; The antioxidant comprises 0.05-5 wt %, the corrosion inhibitor comprises 0.05-2 wt %, the copper corrosion inhibitor comprises 0.05-1.0 wt % and the extreme pressure anti-wear agent comprises 0.05-2.0 wt %.

7. The preparation method according to claim 5 or 6, characterized in that: The heating and vacuuming conditions include: a vacuum degree of -0.09 to -0.098 MPa, and a heating temperature of 80-140°C; preferably, a vacuum degree of -0.092 to -0.096 MPa, and a heating temperature of 100-130°C.

8. The preparation method according to any one of claims 5 to 7, characterized in that: The conditions for the first blending include: the first blending time is 1-6 hours, and the first blending speed is 200-800 rpm; Preferably, the conditions for the first blending include: the first blending time is 2-4h, and the first blending rate is 300-600rpm; Preferably, the conditions for the second blending include: the second blending time is 0.5-2h, the second blending rate is 200-800rpm, and the second blending temperature is 50-100°C; More preferably, the conditions for the second blending include: the second blending time is 1-1.5 h, the second blending rate is 300-600 rpm, and the second blending temperature is 60-80°C.

9. A lubricating oil obtained by the preparation method according to any one of claims 5 to 8.

10. Use of the lubricating oil according to any one of claims 1 to 4 and 9 in a suspension damping system and a braking system.

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