A wind power gear oil, its preparation method and application

Abstract

The present invention relates to the technical field of wind power gear oils, and discloses a wind power gear oil, a preparation method thereof and an application. Based on the total weight of the wind power gear oil, the wind power gear oil comprises: 80-86% of wind power regenerated base oil, 10-15% of alkylnaphthalene, and 3-6% of additives; wherein, the wind power regenerated base oil is obtained by regenerating waste wind power gear oil, and the regeneration process includes: filtering, hydrofining and distilling the waste wind power gear oil. The present invention uses the wind power regenerated base oil after regenerating the waste wind power gear oil as a raw material component, reducing the production cost of the wind power gear oil; on the other hand, the waste wind power oil has a low degree of deterioration and a high resource recovery value, and the recovery and regeneration of the waste wind power gear oil into the base oil can realize the high-value and resource utilization of hazardous waste, can fully utilize the PAO in the waste wind power gear oil, and reduce the waste caused by the excessive use of new PAO; at the same time, the wind power gear oil prepared by using the wind power regenerated base oil fully meets the technical index requirements of GB / T 33540.3-2017.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power gear oil, and particularly relates to a wind power gear oil, a preparation method thereof and an application thereof. Background Art

[0002] In recent years, the installed capacity of wind power in China has increased rapidly. It is estimated that by 2025, the cumulative installed capacity across the country will reach more than 550 million kilowatts. The stable operation of wind turbines is closely related to gear oil. Different from traditional mineral-based lubricating oils, wind turbine gear oil is mainly composed of synthetic base oil polyalphaolefin (PAO) and various additives. PAO determines the basic properties, and additives make up for and improve the deficiencies in performance.

[0003] The existing oil change cycle of wind power gearboxes is generally 5 to 8 years, and the design life of wind turbines is generally 25 years. Therefore, each wind turbine is expected to change oil 2 to 3 times during its life cycle. The purchase price of new oil is about 80,000 to 120,000 yuan per ton. On the other hand, waste wind power gear oil belongs to hazardous waste of HW08 category, and the hazardous waste disposal cost ranges from about 3,000 to 5,000 yuan per ton. At present, the recycling rate of waste wind power gear oil is less than 30% of the total amount. Therefore, it is very meaningful and has significant economic benefits to develop a wind power gear oil with equivalent performance using the regenerated base oil after regenerating waste wind power gear oil. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problems in the prior art that the disposal cost of waste wind power gear oil is high and the price of new wind power gear oil is high, and to provide a wind power gear oil and its application. This wind power gear oil uses the regenerated base oil after regenerating waste wind power gear oil as the raw material, realizes the high-value and resource utilization of waste wind power gear oil after recycling, and reduces the waste caused by excessive use of new PAO.

[0005] To achieve the above purpose, on the one hand, the present invention provides a wind power gear oil. Based on the total weight of the wind power gear oil, the wind power gear oil contains: 80-86% of wind power regenerated base oil, 10-15% of alkylnaphthalene, and 3-6% of additives;

[0006] Among them, the wind power regenerated base oil is obtained by regenerating waste wind power gear oil, and the regeneration process includes: filtering, hydrofining and distilling the waste wind power gear oil.

[0007] Preferably, the additives contain a gear oil compound additive, an antifoaming agent, an antioxidant and an extreme pressure antiwear agent;

[0008] Based on the total weight of the wind power gear oil, the content of the gear oil compound additive is 2-3%, the content of the antifoaming agent is 0.01-0.05%, the content of the antioxidant is 0.1-0.8%, and the content of the extreme pressure antiwear agent is 1.2-2%.

[0009] Preferably, the antioxidant is octyl / butyldiphenylamine and / or dinonyldiphenylamine.

[0010] Preferably, the extreme pressure and anti-wear agent is isobutene sulfide and / or triphenyl thiophosphate.

[0011] Preferably, the gear oil composite additive is HiTEC 307 and / or KT 44310.

[0012] Preferably, the filtration is carried out by a vibrating membrane device, the pore size of the filter membrane is 1-5 μm, and the pressure is 0.4-0.6 MPa;

[0013] Preferably, the conditions for hydrofining include: the hydrogen-oil ratio is 600-800, the temperature is 300-350 °C, and the mass space velocity is 1-1.5 h -1 ;

[0014] Preferably, the conditions for distillation include: the pressure is 200-400 Pa, and the temperature is 170-190 °C.

[0015] Preferably, the kinematic viscosity of the wind power regenerated base oil at 40 °C is 360-400 cSt, and the viscosity index is 160-190.

[0016] The second aspect of the present invention provides a method for preparing a wind power gear oil, which includes: mixing a wind power regenerated base oil, alkylnaphthalene and an additive.

[0017] Preferably, the method includes the following steps:

[0018] (1) Mix the wind power regenerated base oil and alkylnaphthalene to obtain mixture A;

[0019] (2) Mix the mixture A with the gear oil composite additive to obtain mixture B;

[0020] (3) Mix the mixture B with an antioxidant, an extreme pressure and anti-wear agent and an antifoaming agent, and then filter.

[0021] Preferably, in step (1), the mixing is carried out under stirring, wherein the mixing conditions include: the temperature is 55-65 °C, the time is 30-60 min, and the rotation speed is 350-450 r / min;

[0022] Preferably, in step (3), the pore size of the filter membrane used for filtration is not greater than 5 μm.

[0023] The third aspect of the present invention provides an application of the wind power gear oil as described above or the wind power gear oil prepared by the method as described above in a wind turbine generator.

[0024] In the present invention, the regenerated wind power base oil after regenerating waste wind power gear oil is used as a raw material component, reducing the production cost of wind power gear oil; on the other hand, the waste wind power oil has a low degree of deterioration and a high resource recovery value. The recycled base oil of waste wind power gear oil can achieve high-value and resource utilization of hazardous waste, and can make full use of PAO in waste wind power gear oil, reducing the waste caused by excessive use of new PAO. At the same time, the wind power gear oil prepared using the regenerated wind power base oil has excellent performance and fully meets the technical index requirements of GB / T 33540.3-2017. Detailed Embodiments

[0025] The following provides a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0026] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0027] Waste wind power gear oil belongs to hazardous waste of HW08 class, and the hazardous waste disposal cost is about 3,000 - 5,000 yuan per ton. Currently, the recycling rate of waste wind power oil is less than 30% of the total amount; at the same time, mainly new PAO is used as the base oil to develop wind power gear oil, and more attention is paid to the optimization of new oil formulations and the improvement of certain performances. However, through research, it is found in the present invention that waste wind power gear oil with a certain service life has a low degree of deterioration, mainly due to the loss of additives and the introduction of moisture and impurities, and the base oil itself still has a high resource recovery value.

[0028] In view of this, the present invention provides a wind power gear oil that uses the regenerated wind power base oil after regenerating waste wind power gear oil as the base oil. In the present invention, based on the total weight of the wind power gear oil, the wind power gear oil comprises: 80 - 86% of the regenerated wind power base oil, 10 - 15% of alkylnaphthalene, and 3 - 6% of additives;

[0029] Among them, the regenerated wind power base oil is obtained by subjecting waste wind power gear oil to a regeneration treatment, and the process of the regeneration treatment includes: filtering, hydrofining, and distilling the waste wind power gear oil.

[0030] In the present invention, by filtering, hydrofining, and distilling the waste wind power gear oil, particulate impurities, additive elements, moisture, and light hydrocarbon components in the waste wind power gear oil are removed, thereby improving the quality of the waste wind power gear oil so that it can be used as a base oil.

[0031] In a preferred embodiment, the filtration is carried out using a vibrating membrane device, the pore size of the filter membrane is 1-5 μm, the pressure is 0.4-0.6 MPa, and by adopting the above filtration method to remove particulate impurities in the waste wind power gear oil, the impurity content can be controlled to ≤0.50 wt%.

[0032] In a preferred embodiment, the conditions for hydrofining include: the hydrogen-oil ratio is 600-800, the temperature is 300-350 °C, and the mass space velocity is 1-1.5 h -1 The present invention does not limit the specific type of catalyst used for the hydrofining, and it can be a catalyst commonly used in the art. In a preferred embodiment, the catalyst used for the hydrofining is a silica-alumina catalyst loaded with active components such as tungsten and nickel.

[0033] In a preferred embodiment, the conditions for distillation include: the pressure is 200-400 Pa, and the temperature is 170-190 °C.

[0034] In a preferred embodiment, the kinematic viscosity of the wind power regenerated base oil at 40 °C is 360-400 cSt, and the viscosity index is 160-190.

[0035] In a specific embodiment, the wind power regenerated base oil is prepared according to the following process:

[0036] A1. After heating the waste wind power gear oil to 55-65 °C, pump it to a vibrating membrane device for cross-flow filtration (a polymer membrane module, the pore size of the filter membrane is 1-5 μm, and the pressure is 0.5 MPa);

[0037] A2. Pump the waste gear oil obtained in step A1 into a hydrofining system, control the hydrogen-oil ratio at 600-800, the temperature at 300-350 °C, and the mass space velocity at 1-1.5 h -1 , and use a silica-alumina catalyst loaded with active components such as tungsten and nickel;

[0038] A3. Send the waste gear oil obtained in step A2 to a thin-film evaporator, control the pressure at 200-400 Pa, the temperature at 170-190 °C, and the evaporator area is 0.1 m 2 .

[0039] Furthermore, the hydrofining system is composed of a preheater, a fixed-bed reactor, a high-temperature separator, and a low-temperature separator.

[0040] The present invention does not limit the specific types of the additives, which may be common additives in the art. Specifically, for example, they may be defoamers, extreme pressure and anti-wear agents, antioxidants, pour point depressants, rust inhibitors, etc. In a preferred embodiment, the additives include a gear oil compound additive, a defoamer, an antioxidant, and an extreme pressure and anti-wear agent; based on the total weight of the wind power gear oil, the content of the gear oil compound additive is 2-3%, the content of the defoamer is 0.01-0.05%, the content of the antioxidant is 0.1-0.8%, and the content of the extreme pressure and anti-wear agent is 1.2-2%. By selecting the above types of additives and designing the dosages of each additive, the performance of the obtained wind power gear oil is better.

[0041] In a preferred embodiment, based on the total weight of the wind power gear oil, the wind power gear oil comprises: 80-86% wind power recycled base oil, 10-15% alkylnaphthalene, 2-3% gear oil compound additive, 0.01-0.05% defoamer, 0.1-0.8% antioxidant, and 1.2-2% extreme pressure and anti-wear agent.

[0042] Further preferably, based on the total weight of the wind power gear oil, the wind power gear oil comprises: 80-85% wind power recycled base oil, 10-15% alkylnaphthalene, 2-3% gear oil compound additive, 0.01-0.03% defoamer, 0.2-0.5% antioxidant, and 1.5-2% extreme pressure and anti-wear agent.

[0043] In a preferred embodiment, the antioxidant is octyl / butyldiphenylamine and / or dinonyldiphenylamine.

[0044] In a preferred embodiment, the extreme pressure and anti-wear agent is sulfurized isobutene and / or triphenyl thiophosphate. More preferably, the extreme pressure and anti-wear agent is a mixture of sulfurized isobutene and triphenyl thiophosphate. By selecting the above extreme pressure and anti-wear agent, the anti-wear performance of the obtained wind power gear oil is better. When the extreme pressure and anti-wear agent is a mixture of sulfurized isobutene and triphenyl thiophosphate, the present invention does not limit the specific dosage relationship between the two, which can be designed according to actual needs. Preferably, the weight ratio of sulfurized isobutene to triphenyl thiophosphate is 1:0.5-4, more preferably 1:1.5-2.5.

[0045] The present invention does not limit the specific selection of the gear oil compound additive, which may be a common gear oil compound additive in the art. In a preferred embodiment, the gear oil compound additive is HiTEC 307 of Afton Company and / or KT 44310 of Kangtai Company. Thus, the comprehensive performance of the obtained wind power gear oil is better.

[0046] For the specific selection of the defoamer, the present invention does not make any restrictions, and it can be a commonly used defoamer in the art. In a preferred embodiment, the defoamer is the non-silicon defoamer HiTEC 2030 of Afton Company or the composite defoamer KT 992 of Kangtai Company. By selecting the above specific defoamer, the defoaming ability of the obtained wind power gear oil is better.

[0047] The wind power gear oil provided by the present invention improves the problems of large polarity difference and poor solubility between the wind power recycled base oil and the gear oil composite additive through the addition of the solubilizer alkylnaphthalene, and improves the stability of the gear oil. Alkylnaphthalene has good adsorption to metals and can form a stable oil film on the gear surface, reducing the friction and wear between metals; the new defoamer provides good defoaming ability, reduces the foaming caused by the local temperature rise during the tooth surface meshing process, and at the same time can avoid being filtered out and affecting its defoaming effect on the wind power gear oil; the amine antioxidant provides good antioxidant properties during the high-temperature operation of the gear, and cooperates with the gear oil composite additive to enhance the oxidation stability of the oil product; the extreme pressure and anti-wear agent can react with the gear metal surface to form a chemical reaction film, and will not be damaged by high heat during the high-load operation of the gear, effectively preventing the metal surface from being scratched.

[0048] The present invention also proposes a preparation method of the wind power gear oil as described above, and the method includes: mixing the wind power recycled base oil, alkylnaphthalene and additives.

[0049] In a preferred embodiment, the method includes the following steps:

[0050] (1) Mix the wind power recycled base oil and alkylnaphthalene to obtain mixture A;

[0051] (2) Mix the mixture A with the gear oil composite additive to obtain mixture B;

[0052] (3) Mix the mixture B with the antioxidant, extreme pressure and anti-wear agent and defoamer, and then filter.

[0053] By mixing the components in the above order, the mixing effect is better, so that the comprehensive performance of the prepared wind power gear oil is better.

[0054] The present invention does not limit the specific parameters of the mixing in step (1), as long as the wind power recycled base oil and alkylnaphthalene can be mixed evenly. In a specific embodiment, in step (1), the mixing is carried out under stirring conditions, and the mixing conditions include: the temperature is 55-65°C, the time is 30-60 min, and the rotation speed is 350-450 r / min.

[0055] The present invention also does not limit the specific parameters of the mixing in step (2), as long as the mixture A and the gear oil compound additive can be mixed evenly. In a specific embodiment, in step (2), the mixing is carried out under stirring conditions, where the mixing conditions include: temperature of 59 - 61 °C, time of 60 - 90 min, and rotation speed of 300 - 400 r / min.

[0056] In a specific embodiment, in step (3), the mixing is carried out under stirring conditions, where the mixing conditions include: temperature of 59 - 61 °C, time of 60 - 90 min, and rotation speed of 300 - 400 r / min. Under the above conditions, each raw material component can be mixed evenly.

[0057] In a preferred embodiment, in step (3), the pore size of the filter membrane used for filtration is not greater than 5 μm, preferably 1 - 5 μm.

[0058] The present invention also proposes the application of the above-mentioned wind power gear oil or the wind power gear oil prepared by the above-mentioned method in a wind turbine. Since the above-mentioned wind power gear oil has a high viscosity index, good shear resistance and low-temperature fluidity, it can be well applied in a wind turbine.

[0059] The present invention will be described in detail below through examples, but the protection scope of the present invention is not limited thereto. The experimental methods in the following examples are all conventional methods in the art unless otherwise specified. The experimental materials used in the following examples can all be obtained commercially unless otherwise specified.

[0060] In the following examples and comparative examples, the raw materials used include the following:

[0061] The alkyl naphthalene selected is Synesstic 5, produced by Mobil.

[0062] The gear oil compound additive selected is HiTEC 307 (produced by Afton) or KT 44310 (produced by Kangtai).

[0063] The defoamer selected is the non-silicon defoamer HiTEC 2030 (produced by Afton) or the compound defoamer KT 992 (produced by Kangtai).

[0064] The antioxidant selected is octyl / butyl diphenylamine T557 or dinonyl diphenylamine T558.

[0065] The extreme pressure and anti-wear agent is a compound of sulfurized isobutene T321 and triphenyl thiophosphate T309.

[0066] In the following preparation examples, the waste wind power gear oil selected is Mobil waste wind power gear oil.

[0067] Preparation Example 1

[0068] A1. After heating the waste wind power gear oil to 60 °C, pump it to a vibrating membrane device for cross-flow filtration (a polymer membrane module with a filter membrane pore size of 2.5 μm and a pressure of 0.5 MPa) to remove particulate impurities in the waste lubricating oil;

[0069] A2. Pump the gear oil obtained in step A1 into a hydrofining system (consisting of a preheater, a fixed-bed reactor, a high-temperature separator, and a low-temperature separator), control the hydrogen-oil ratio at 750, the temperature at 320 °C, and the mass space velocity at 1.45 h -1 , and use a silica-alumina catalyst (in the silica-alumina catalyst, the active components are tungsten and nickel, and the carrier is Al2O3 / SiO2; based on the total weight of the silica-alumina catalyst, the content of the active component tungsten is 16.8 wt%, and the content of nickel is 4.7 wt%);

[0070] A3. Send the gear oil obtained in step A2 to a thin-film evaporator, control the pressure at 200 Pa, the temperature at 175 °C, and the evaporator area at 0.1 m 2 , to obtain the wind power regenerated base oil S1.

[0071] After testing, the performance parameters of the wind power regenerated base oil S1 are shown in Table 1 below.

[0072] Table 1

[0073]

[0074]

[0075] Preparation Example 2

[0076] Carry out the method according to Preparation Example 1, except that in step A2, control the hydrogen-oil ratio of the hydrofining system at 650, the temperature at 345 °C, and the mass space velocity at 1.1 h -1 .

[0077] In this example, the wind power regenerated base oil S2 is prepared, and its performance parameters are shown in Table 2 below.

[0078] Table 2

[0079] Performance Parameters Wind Power Recycled Base Oil Appearance Colorless Kinematic Viscosity (40°C), cSt 370.2 Viscosity Index 177 Acid Value, mgKOH / g 0.1 Water Content, ppm 45 Fe, ppm 0 P, ppm 5 S, ppm 110 Zn, ppm 0

[0080] Preparation Example 3

[0081] Carry out the method according to Preparation Example 1, except that in step A3, control the pressure of the thin-film evaporator at 400 Pa and the temperature at 190 °C.

[0082] In this example, the wind power regenerated base oil S3 is prepared, and its performance parameters are shown in Table 3 below.

[0083] Table 3

[0084] Performance Parameters Wind Power Recycled Base Oil Appearance Colorless Kinematic Viscosity (40°C), cSt 393.1 Viscosity Index 179 Acid Value, mgKOH / g 0.15 Water Content, ppm 35 Fe, ppm 0 P, ppm 0 S, ppm 102 Zn, ppm 0

[0085] Preparation Example 4

[0086] During the regeneration process of the wind power regenerated base oil, the hydrofining step was not carried out, that is:

[0087] A1. After heating the waste wind power gear oil to 60 °C, it was pumped to a vibrating membrane device for cross-flow filtration (a polymer membrane module with a filter membrane pore size of 2.5 μm and a pressure of 0.5 MPa) to remove particulate impurities in the waste lubricating oil;

[0088] A2. The gear oil obtained in step A1 was sent to a thin-film evaporator, with the pressure controlled at 200 Pa and the temperature controlled at 175 °C, and the evaporator area was 0.1 m 2 , to obtain the wind power regenerated base oil S4.

[0089] After testing, the performance parameters of the wind power regenerated base oil S4 are shown in Table 4 below.

[0090] Table 4

[0091]

[0092]

[0093] Example 1

[0094] This example is used to illustrate the wind power gear oil and its preparation method described in the present invention.

[0095] A wind power gear oil, by weight fraction, comprises the following raw material components: 83.32% of the wind power regenerated base oil S1 (i.e., prepared in Preparation Example 1), 12% of alkylnaphthalene Synesstic 5, 2.65% of the gear oil compound additive HiTEC307, 0.5% of the antioxidant T557, 1.5% of the extreme pressure and anti-wear agent, 0.03% of the defoaming agent HiTEC 2030; wherein, the extreme pressure and anti-wear agent is composed of 0.5% of T321 and 1% of T309 compounded.

[0096] The preparation method of the wind power gear oil comprises the following steps:

[0097] (1) The wind power regenerated base oil S1 and alkylnaphthalene Synesstic 5 were added to a blending kettle in sequence, the temperature was raised and the temperature of the mixture was maintained at 65 °C, the stirring time was 60 min, and the rotation speed was 400 r / min to obtain a mixture A;

[0098] (2) Add the gear oil compound HiTEC 307 to the mixture A, control the temperature of the system at 60 °C (with an upper and lower deviation not exceeding ±1 °C), stir for 60 min at a rotation speed of 400 r / min to obtain mixture B;

[0099] (3) Add antioxidant T557, extreme pressure and anti-wear agent, and defoamer HiTEC 2030 to the mixture B in sequence, control the temperature of the system at 60 °C (with an upper and lower deviation not exceeding ±1 °C), stir for 90 min at a rotation speed of 400 r / min to obtain mixture C;

[0100] (4) Filter the above mixture C using a filter with a pore size of 2.5 μm to obtain wind power gear oil.

[0101] Example 2

[0102] A kind of wind power gear oil, by weight fraction, comprises the following raw material components: 80.5% of wind power recycled base oil S1 (i.e., prepared in Preparation Example 1), 15% of alkylnaphthalene Synesstic 5, 2.38% of gear oil compound additive KT 44310, 0.3% of antioxidant T558, 1.8% of extreme pressure and anti-wear agent, 0.02% of defoamer KT 992; wherein, the extreme pressure and anti-wear agent is composed of 0.6% of T321 and 1.2% of T309 by compounding.

[0103] The preparation method of the wind power gear oil comprises the following steps:

[0104] (1) Add wind power recycled base oil S1 and alkylnaphthalene Synesstic 5 to the blending kettle in sequence, heat up and keep the temperature of the mixture at 60 °C, stir for 45 min at a rotation speed of 450 r / min to obtain mixture A;

[0105] (2) Add the gear oil compound additive KT 44310 to the mixture A, control the temperature of the system at 60 °C (with an upper and lower deviation not exceeding ±1 °C), stir for 90 min at a rotation speed of 300 r / min to obtain mixture B;

[0106] (3) Add antioxidant T558, extreme pressure and anti-wear agent, and defoamer KT 992 to the mixture B in sequence, control the temperature of the system at 60 °C (with an upper and lower deviation not exceeding ±1 °C), stir for 60 min at a rotation speed of 350 r / min to obtain mixture C;

[0107] (4) Filter the above mixture C using a filter with a pore size of 5 μm to obtain wind power gear oil.

[0108] Example 3

[0109] The method described in Example 1 was implemented, except that the wind power gear oil contained the following raw material components by weight fraction: 84.83% of the wind power recycled base oil S2 prepared in Preparation Example 2, 10.5% of alkylnaphthalene Synesstic 5, 2.65% of the gear oil compound additive HiTEC 307, 0.5% of antioxidant T557, 1.5% of extreme pressure and anti-wear agent, 0.02% of defoamer HiTEC 2030; wherein, the extreme pressure and anti-wear agent was compounded from 0.6% of T321 and 0.9% of T309.

[0110] Example 4

[0111] The method described in Example 1 was implemented, except that the wind power gear oil contained the following raw material components by weight fraction: 80.32% of the wind power recycled base oil S3 in Preparation Example 3, 14.5% of alkylnaphthalene Synesstic 5, 2.65% of the gear oil compound additive HiTEC 307, 0.5% of antioxidant T557, 2% of extreme pressure and anti-wear agent, 0.03% of defoamer HiTEC 2030; wherein, the extreme pressure and anti-wear agent was compounded from 0.6% of T321 and 1.4% of T309.

[0112] Comparative Example 1

[0113] The method described in Example 1 was implemented, except that the wind power gear oil contained the following raw material components by weight fraction: 89.32% of the wind power recycled base oil S1, 6% of alkylnaphthalene Synesstic5, 2.65% of the gear oil compound additive HiTEC 307, 0.5% of antioxidant T557, 1.5% of extreme pressure and anti-wear agent, 0.03% of defoamer HiTEC 2030; wherein, the extreme pressure and anti-wear agent was compounded from 0.5% of T321 and 1% of T309.

[0114] Comparative Example 2

[0115] The method described in Example 1 was implemented, except that the wind power recycled base oil S4 prepared in Preparation Example 4 was used, and the amounts of the wind power recycled base oil S4 and alkylnaphthalene were adjusted adaptively according to its viscosity data;

[0116] Specifically, the wind power gear oil contained the following raw material components by weight fraction: 85.12% of the wind power recycled base oil S4 prepared in Preparation Example 4, 10.2% of alkylnaphthalene Synesstic 5, 2.65% of the gear oil compound additive HiTEC 307, 0.5% of antioxidant T557, 1.5% of extreme pressure and anti-wear agent, 0.03% of defoamer HiTEC 2030; wherein, the extreme pressure and anti-wear agent was compounded from 0.5% of T321 and 1% of T309.

[0117] Test Example

[0118] Perform performance tests on the wind power gear oils prepared in Examples 1-4 and Comparative Examples 1-2, as well as a certain brand of synthetic gear oil on the market, and the results are shown in Tables 5-6 below.

[0119] Table 5

[0120]

[0121] Table 6

[0122]

[0123] It can be seen from Tables 5-6 that the wind power gear oils prepared in Examples 1-4 fully meet the technical index requirements of GB / T33540.3-2017 and are comparable in performance to the oil of a certain brand, indicating that the solution provided by the present invention can produce a new wind power gear oil with excellent performance from waste wind power gear oil, which can be reused in wind turbine units.

[0124] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A wind power gear oil, characterized in that, Based on the total weight of the wind power gear oil, the wind power gear oil comprises: 80-86% of wind power recycled base oil, 10-15% of alkylnaphthalene, and 3-6% of additives; Among them, the wind power recycled base oil is obtained by regenerating waste wind power gear oil, and the process of the regeneration treatment includes: filtering, hydrofining, and distilling the waste wind power gear oil; The filtering is carried out by using a vibrating membrane device, the pore size of the filter membrane is 1-5 μm, and the pressure is 0.4-0.6 MPa; The conditions for hydrofining include: a hydrogen-oil ratio of 600 to 800, a temperature of 300 to 350 °C, and a mass space velocity of 1 to 1.5 h -1 ; The conditions of the distillation include: the pressure is 200-400 Pa, and the temperature is 170-190 °C.

2. The wind power gear oil according to claim 1, wherein The additives contain a gear oil compound additive, an antifoaming agent, an antioxidant, and an extreme pressure antiwear agent; Based on the total weight of the wind power gear oil, the content of the gear oil compound additive is 2-3%, the content of the antifoaming agent is 0.01-0.05%, the content of the antioxidant is 0.1-0.8%, and the content of the extreme pressure antiwear agent is 1.2-2%.

3. The wind power gear oil according to claim 2, wherein The antioxidant is octyl / butyldiphenylamine and / or dinonyldiphenylamine; And / or, the extreme pressure antiwear agent is sulfurized isobutene and / or triphenyl thiophosphate.

4. The wind power gear oil according to claim 2, wherein The gear oil compound additive is HiTEC307 and / or KT 44310.

5. The wind power gear oil according to claim 1, wherein The kinematic viscosity of the wind power recycled base oil at 40 °C is 360-400 cSt, and the viscosity index is 160-190.

6. The preparation method of the wind power gear oil according to any one of claims 1-5, characterized in that, The method includes: mixing the wind power recycled base oil, alkylnaphthalene, and additives.

7. The method according to claim 6, characterized in that, The method includes the following steps: (1) Mix the wind power recycled base oil and alkylnaphthalene to obtain mixture A; (2) Mix the mixture A with the gear oil compound additive to obtain mixture B; (3) Mix the mixture B with the antioxidant, extreme pressure antiwear agent, and antifoaming agent, and then filter.

8. The method according to claim 6, characterized in that, In step (1), the mixing is carried out under a stirring state, and the conditions of the mixing include: the temperature is 55-65 °C, the time is 30-60 min, and the rotation speed is 350-450 r / min; And / or, in step (3), the pore size of the filter membrane used for filtering is not greater than 5 μm.

9. Application of the wind power gear oil according to any one of claims 1-5 or the wind power gear oil prepared by the method according to any one of claims 6-8 in a wind turbine generator.

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