Megawatt-class wind power gear lubricating oil composition and preparation method thereof

Abstract

The invention discloses a megawatt-class wind power gear lubricating oil composition, which is composed of the following components according to mass fraction: phosphorus-containing antiwear agent: 0.5% to 2.5%; anti-micropitting additive: 0.1% to 1%; deposit control agent: 0.2% to 1.5%; antioxidant: 0.4% to 2%; metal deactivator: 0.03% to 0.5%; rust inhibitor: 0.05% to 1%; composite antifoaming agent: 0.003% to 0.2%; synthetic base oil: 91.3% to 98.15%; the sum of the mass percentages of the above components is 100%; the invention also discloses a preparation method thereof, which comprises adding the above components at one time in a blending kettle according to the mass fraction, stirring until the mixture is uniform and transparent, and then cooling and filtering. The composition of the invention has excellent anti-scratch, anti-micropitting and deposit control performance, excellent anti-foaming performance after precision filtration during long-term use, and especially excellent bearing protection performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of lubricating oils, and relates to a megawatt-class wind turbine gear lubricating oil composition; the present invention also relates to a method for preparing the megawatt-class wind turbine gear lubricating oil composition. Background Art

[0002] With the increasing consumption of traditional energy, the global energy supply is becoming increasingly tight. Wind energy, as a green energy, has become one of the renewable energy sources with the lowest development cost and the best development prospects. Wind power gear oil has very strict requirements in terms of anti-micropitting, bearing protection and oil cleanliness, especially the main gearbox. The gear oil used plays a very important role in ensuring the stable operation of wind power equipment. Since 2015, wind turbine manufacturing technology has made rapid progress, and wind turbines have achieved a leap from kilowatt level to megawatt level. High-power wind turbines of 1.5 megawatts and above have become mainstream models and need to adapt to complex domestic environmental conditions. This puts forward more stringent requirements on the anti-scratch performance, bearing protection performance and sediment control performance of wind turbine gear oil under long-term operating conditions of more than 5 years, especially the anti-foaming performance of the oil after filtration during use.

[0003] CN102041148A reported a synthetic gear oil for wind power generation, which uses imported compounding agents and ester-based fully synthetic base oils to improve the poor compatibility and non-biodegradability of existing synthetic hydrocarbon gear oil sealing materials. CN105567402B reported a long-life anti-micropitting wind power gear oil and its preparation method, which uses 3-6% industrial gear oil compounding agent, 0.1-0.3% antioxidant, 0.1-1% anti-wear agent, and the balance as base oil. CN106967487 B reported a low-friction coefficient wind power gear oil composition and its preparation method, which uses polyalphaolefins and ester base oils of special structural formulas, and sulfur-containing extreme pressure agents to effectively reduce the friction coefficient of the oil. The above reports on wind power gear oils focus on 320 viscosity, and pay more attention to the compatibility of oils with sealing materials, long-life anti-micropitting, and reduced friction coefficient, but do not mention the power of applicable wind turbines. In fact, the lubrication parts of wind turbine gear oil include the main gearbox, yaw reduction box and pitch reduction box, covering three viscosities of 150, 220 and 320. Compared with kilowatt-level wind turbines, high-power wind turbines of 1.5 megawatts and above have higher requirements for the oil's ability to resist abrasion; during the long-term operation of wind turbines, there are often problems such as insufficient anti-foaming properties of the oil after precise filtration, resulting in oil overflow, which puts higher requirements on the oil's anti-foaming stability. Wind turbine gear oil not only lubricates gears, but also lubricates bearings, which puts higher requirements on the oil's bearing protection performance. In addition, wind turbine gear oil is generally required to be used for more than 5 years, which also puts higher requirements on the oil's anti-oxidation and sediment control.

[0004] Compared with the prior art, the present invention uses a phosphorus-containing anti-wear agent with a special structure to significantly reduce bearing wear of oil products and greatly extend the service life of bearings. The anti-micropitting additive and deposit control agent used in the present invention are used in synergy to effectively improve the anti-micropitting fatigue wear performance and deposit control performance of oil products under extreme working conditions such as low-speed heavy load and ultra-long cycle operation, and greatly extend the service life of oil products. The composite anti-foaming agent in the present invention is a mixture of a certain proportion of polyacrylate with a molecular weight of 20,000 and a perfluoropolyether condensate with a number average molecular weight of 50,000. It is the result of comparative tests with various structural anti-foaming agents, which reduces the adsorption of anti-foaming agents by filtering equipment, so that the oil products still have excellent anti-foaming properties after long-term use and precision filtration. Summary of the invention

[0005] The purpose of the present invention is to provide a megawatt-class wind turbine gear lubricant composition, which has the characteristic of improving the performance of the wind turbine gear lubricant.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned megawatt-class wind turbine gear lubricating oil composition.

[0007] The technical solution adopted by the present invention is a megawatt-class wind power gear lubricant composition, which is composed of the following raw material components in terms of mass percentage:

[0008] Phosphorus-containing antiwear agent: 0.5% to 2.5%; anti-micropitting additive: 0.1% to 1%; deposit control agent: 0.2% to 1.5%; antioxidant: 0.4% to 2%; metal deactivator: 0.03% to 0.5%; rust inhibitor: 0.05% to 1%; composite antifoaming agent: 0.003% to 0.2%; synthetic base oil: 91.3% to 98.15%; the sum of the mass percentages of the above components is 100%.

[0009] The present invention is also characterized in that:

[0010] The megawatt-class wind turbine gear lubricant composition is composed of the following components in terms of mass fraction: phosphorus-containing antiwear agent: 0.85% to 1.75%; anti-micropitting additive: 0.1% to 0.8%; deposit control agent: 0.2% to 1%; antioxidant: 0.7% to 1.4%; metal deactivator: 0.06% to 0.5%; rust inhibitor: 0.05% to 1%; composite antifoaming agent: 0.003% to 0.15%; synthetic base oil: 91.3% to 97.24%; the sum of the mass percentages of the above components is 100%.

[0011] The phosphorus-containing anti-wear agent is at least one of phosphate amine salt, triphenyl phosphate, and alkyl thiophosphate.

[0012] The structural formula of phosphate amine salt is:

[0013]

[0014] Among them, R1 is a straight chain or branched C4~C8 hydrocarbon group, R2 is a hydrogen atom or a straight chain or branched C4~C8 hydrocarbon group; R3 is a straight chain or branched C8~C18 hydrocarbon group.

[0015] The structural formula of triphenyl phosphate is:

[0016]

[0017] Among them, R4, R5 and R6 are the same, and are straight-chain or branched C1-C20 hydrocarbon groups.

[0018] The structural formula of alkyl thiophosphate is:

[0019]

[0020] Wherein, R7 is a hydrogen atom or a linear or branched C4-C8 hydrocarbon group.

[0021] The anti-micropitting additive is at least one of alkyl salicylate and sulphurized alkyl phenol.

[0022] The structural formula of alkyl salicylate is:

[0023]

[0024] In the formula, R8 is an alkyl group containing 8 to 18 carbon atoms, M is K or Mg or Ca or Na, and the total base number is 300 to 350 mg / g in terms of KOH.

[0025] The structural formula of sulphurized alkyl phenol salt is:

[0026]

[0027] In the formula, R9 is an alkyl group containing 8 to 18 carbon atoms, x is a positive integer, N is K or Mg or Ca or Na, and the total base number is 210 to 230 mg / g in terms of KOH.

[0028] The deposit control agent is at least one of polyisobutylene succinimide and boronized polymer polyisobutylene succinimide.

[0029] The structural formula of polyisobutylene succinimide is:

[0030]

[0031] Wherein PIB is polyisobutylene with a molecular weight of 2500 to 4000, and n is a positive integer.

[0032] The structural formula of boronated polymer polyisobutylene succinimide is:

[0033]

[0034] Wherein PIB is polyisobutylene with a molecular weight of 2500 to 4000, and n is a positive integer.

[0035] The antioxidant is a composition of 2,6-di-tert-butyl-p-cresol and an aromatic amine antioxidant, and the mass ratio of the composition of 2,6-di-tert-butyl-p-cresol and the aromatic amine antioxidant is 1:4-3:4.

[0036] 2. The mass ratio of the composition of 6-di-tert-butyl-p-cresol and aromatic amine antioxidant is 3:4.

[0037] The structural formula of aromatic amine antioxidants is:

[0038]

[0039] Where R 10 and R 11 are the same or different, and represent a linear or branched C4-C18 hydrocarbon group, R 12 and R 13 The same represents a hydrogen atom or a methyl group.

[0040] The metal deactivator is at least one of alkylthiadiazole dimer, N,N-dinonylaminomethylenebenzotriazole and N,N-dioctylaminomethylenebenzotriazole.

[0041] The structural formula of alkylthiadiazole dimer is:

[0042]

[0043] Where R 14 and R 15 The same refers to a tertiary alkyl group of C9, C12, C16 or C18.

[0044] The rust inhibitor is diisooctyl phosphate octadecene amine salt.

[0045] The composite antifoaming agent is a mixture of a polyacrylate with a molecular weight of 20,000 and a perfluoropolyether condensate with a number average molecular weight of 50,000 and a diluent oil which is No. 2 industrial white oil with a boiling point of 200°C; the mass ratio of the mixture of the polyacrylate with a molecular weight of 20,000 and the perfluoropolyether condensate with a number average molecular weight of 50,000 and the diluent oil which is No. 2 industrial white oil with a boiling point of 200°C is 1:9.

[0046] The mass ratio of polyacrylate to the perfluoropolyether condensate is 1:1 to 2:1.

[0047] The mass ratio of polyacrylate to the perfluoropolyether condensate is 1:1.

[0048] The synthetic base oil is a composition of poly-α-olefin and ester base oil, wherein the poly-α-olefin accounts for 65% to 85% of the mass of the composition of the poly-α-olefin and ester base oil.

[0049] The poly α-olefin is a poly α-olefin mPAO base oil prepared by a metallocene catalytic polymerization process; the ester base oil is at least one of diisooctyl azelate, isotridecyl sebacate, diisodecyl sebacate, di(2-ethylhexyl) sebacate, pentaerythritol tetraisooctanoate, pentaerythritol tetrapelargonate, and pentaerythritol tetracaprylate.

[0050] Another technical scheme adopted by the present invention is a method for preparing a megawatt-class wind turbine gear lubricant composition, wherein the following components are added at one time in a blending kettle according to mass fraction: phosphorus-containing antiwear agent: 0.5% to 2.5%; anti-micropitting additive: 0.1% to 1%; deposit control agent: 0.2% to 1.5%; antioxidant: 0.4% to 2%; metal deactivator: 0.03% to 0.5%; rust inhibitor: 0.05% to 1%; composite antifoaming agent: 0.003% to 0.2%; synthetic base oil: 91.3% to 98.15%; the sum of the mass percentages of the above components is 100%; the mixture is fully stirred in a blending kettle at 55 to 65° C. for 2 to 3 hours, cooled and filtered until the mixture is transparent, and the filtrate is taken as the megawatt-class wind turbine gear lubricant composition.

[0051] The beneficial effects of the present invention are:

[0052] 1) The present invention uses a phosphorus-containing anti-wear agent with a special structure to significantly reduce bearing wear of oil products and greatly extend the service life of bearings.

[0053] 2) The anti-micropitting additive and the deposit control agent used in the present invention are used in conjunction to effectively improve the anti-micropitting fatigue wear performance and low deposit performance of the oil product under extreme working conditions such as low speed and heavy load and ultra-long cycle operation, thereby greatly extending the service life of the oil product.

[0054] 3) The composite antifoaming agent in the present invention is a mixture of a certain proportion of polyacrylate with a molecular weight of 20,000 and a perfluoropolyether condensate with a number average molecular weight of 50,000, which is the result of comparative tests with various antifoaming agents. It reduces the adsorption of antifoaming agents by filtering equipment, so that the oil product still has excellent antifoaming performance after long-term use and precision filtration.

[0055] 4) The poly-α-olefin mPAO base oil and the synthetic ester base oil of special structure prepared by the special process adopted in the present invention ensure good compatibility with various additives, so that the oil product has a longer service life. DETAILED DESCRIPTION

[0056] The present invention is described in detail below in conjunction with specific implementation modes.

[0057] The present invention discloses a megawatt-class wind power gear lubricating oil composition, which is composed of the following raw material components in terms of mass percentage:

[0058] Phosphorus-containing antiwear agent: 0.5% to 2.5%; anti-micropitting additive: 0.1% to 1%; deposit control agent: 0.2% to 1.5%; antioxidant: 0.4% to 2%; metal deactivator: 0.03% to 0.5%; rust inhibitor: 0.05% to 1%; composite antifoaming agent: 0.003% to 0.2%; synthetic base oil: 91.3% to 98.15%; the sum of the mass percentages of the above components is 100%.

[0059] Preferably, the megawatt-class wind turbine gear lubricant composition is composed of the following raw material components in terms of mass percentage:

[0060] Phosphorus-containing antiwear agent: 0.85% to 1.75%; anti-micropitting additive: 0.1% to 0.8%; deposit control agent: 0.2% to 1%; antioxidant: 0.7% to 1.4%; metal deactivator: 0.06% to 0.5%; rust inhibitor: 0.05% to 1%; composite antifoaming agent: 0.003% to 0.15%; synthetic base oil: 91.3% to 97.24%. The sum of the mass percentages of the above components is 100%.

[0061] Preferably, the phosphorus-containing antiwear agent is at least one of phosphate amine salts, triphenyl phosphate, and alkyl thiophosphate.

[0062] Preferably, the structural formula of the phosphate amine salt is:

[0063]

[0064] Among them, R1 is a straight chain or branched C4~C8 hydrocarbon group, R2 is a hydrogen atom or a straight chain or branched C4~C8 hydrocarbon group; R3 is a straight chain or branched C8~C18 hydrocarbon group.

[0065] Preferably, R2 is a hydrogen atom.

[0066] Preferably, the structural formula of triphenyl phosphate is:

[0067]

[0068] In the formula, R4, R5 and R6 are the same and are straight-chain or branched C1-C20 hydrocarbon groups.

[0069] Preferably, R4, R5 and R6 are each a linear or branched C4-C16 hydrocarbon group.

[0070] Preferably, the structural formula of alkyl thiophosphate is:

[0071]

[0072] Wherein, R7 is a hydrogen atom or a linear or branched C4-C8 hydrocarbon group.

[0073] Preferably, R7 is a hydrogen atom.

[0074] Preferably, the anti-micropitting additive is at least one of alkyl salicylate and sulphurized alkyl phenol.

[0075] Preferably, the structural formula of alkyl salicylate is:

[0076]

[0077] In the formula, R8 is an alkyl group containing 8 to 18 carbon atoms, M is K or Mg or Ca or Na, and the total base number is 300 to 350 mg / g in terms of KOH.

[0078] Preferably, the structural formula of the sulphurized alkyl phenol salt is:

[0079]

[0080] In the formula, R9 is an alkyl group containing 8 to 18 carbon atoms, x is a positive integer, N is K or Mg or Ca or Na, and the total base number is 210 to 230 mg / g in terms of KOH.

[0081] Preferably, the deposit control agent is at least one of polyisobutylene succinimide and boronated polymer polyisobutylene succinimide.

[0082] Preferably, the structural formula of polyisobutylene succinimide is:

[0083]

[0084] Wherein PIB is polyisobutylene with a molecular weight of 2500 to 4000, and n is a positive integer.

[0085] Preferably, the structural formula of the boronated polymer polyisobutylene succinimide is:

[0086]

[0087] Wherein PIB is polyisobutylene with a molecular weight of 2500 to 4000, and n is a positive integer.

[0088] Preferably, the antioxidant is a combination of 2,6-di-tert-butyl-p-cresol and an aromatic amine antioxidant, and the mass ratio of the combination of 2,6-di-tert-butyl-p-cresol and an aromatic amine antioxidant is 1:4 to 3:4.

[0089] Preferably, the mass ratio of the composition of 2,6-di-tert-butyl-p-cresol and aromatic amine antioxidant is 3:4.

[0090] Preferably, the structural formula of the aromatic amine antioxidant is:

[0091]

[0092] Where R 10 and R 11 are the same or different, and represent a linear or branched C4-C18 hydrocarbon group, R 12 and R 13 The same represents a hydrogen atom or a methyl group.

[0093] Preferably, R 10 and R 11 It is a straight-chain or branched C12-C16 hydrocarbon group.

[0094] Preferably, the metal deactivator is at least one of alkylthiadiazole dimer, N,N-dinonylaminomethylenebenzotriazole, and N,N-dioctylaminomethylenebenzotriazole.

[0095] Preferably, the structural formula of the alkylthiadiazole dimer is:

[0096]

[0097] Where R 14 and R 15 The same refers to a tertiary alkyl group of C9, C12, C16 or C18.

[0098] Preferably, R 14 It is a C9 or C12 tertiary alkyl group.

[0099] Preferably, the rust inhibitor is diisooctyl phosphate octadecylamine salt.

[0100] Preferably, the composite antifoaming agent is a mixture of a polyacrylate with a molecular weight of 20,000 and a perfluoropolyether condensate with a number average molecular weight of 50,000 and a diluent oil which is No. 2 industrial white oil with a boiling point of 200°C; the mass ratio of the mixture of the polyacrylate with a molecular weight of 20,000 and the perfluoropolyether condensate with a number average molecular weight of 50,000 to the diluent oil which is No. 2 industrial white oil with a boiling point of 200°C is 1:9.

[0101] Preferably, the mass ratio of polyacrylate to the perfluoropolyether condensate is 1:1 to 2:1.

[0102] Preferably, the mass ratio of polyacrylate to the perfluoropolyether condensate is 1:1.

[0103] Preferably, the synthetic base oil is a composition of poly-α-olefin and ester base oil, and the poly-α-olefin accounts for 65% to 85% of the mass of the composition of poly-α-olefin and ester base oil.

[0104] Preferably, the poly α-olefin is a poly α-olefin mPAO base oil prepared by a metallocene catalytic polymerization process; the ester base oil is at least one of diisooctyl azelate, isotridecyl sebacate, diisodecyl sebacate, di(2-ethylhexyl) sebacate, pentaerythritol tetraisooctanoate, pentaerythritol tetrapelargonate, and pentaerythritol tetracaprylate.

[0105] Another technical scheme adopted by the present invention is a method for preparing a megawatt-class wind turbine gear lubricant composition, wherein the following components are added at one time in a blending kettle according to mass fraction: phosphorus-containing antiwear agent: 0.5% to 2.5%; anti-micropitting additive: 0.1% to 1%; deposit control agent: 0.2% to 1.5%; antioxidant: 0.4% to 2%; metal deactivator: 0.03% to 0.5%; rust inhibitor: 0.05% to 1%; composite antifoaming agent: 0.003% to 0.2%; synthetic base oil: 91.3% to 98.15%; the sum of the mass percentages of the above components is 100%; the mixture is fully stirred in a blending kettle at 55 to 65° C. for 2 to 3 hours, cooled and filtered until the mixture is transparent, and the filtrate is taken as the megawatt-class wind turbine gear lubricant composition.

[0106] The main formula of the megawatt-class wind power gear lubricating oil composition of the present invention plays the following roles:

[0107] Phosphorus-containing anti-wear agent: can significantly reduce bearing wear of oil products and greatly extend the service life of bearings.

[0108] Anti-micropitting additives and deposit control agents are used in conjunction with each other to effectively improve the oil's anti-micropitting fatigue wear performance and low deposit performance under extreme operating conditions such as low speed, heavy load and ultra-long cycle operation, greatly extending the oil's service life.

[0109] Composite anti-foaming agent: A mixture of a certain proportion of polyacrylate with a molecular weight of 20,000 and a perfluoropolyether condensate with a number average molecular weight of 50,000 is selected to reduce the adsorption of the anti-foaming agent by the filtering equipment, so that the oil still has excellent anti-foaming performance after long-term use and precision filtration.

[0110] Synthetic base oil: Poly-a-olefin mPAO base oil and synthetic ester base oil ensure good compatibility with various additives, making the oil have a longer service life.

[0111] The present invention provides a megawatt-class wind turbine gear lubricant composition, which includes three viscosity grades of 150, 220, and 320, and has passed the lubricant anti-foaming performance determination method (GB / T 12579 or ASTM D892), FLENDER anti-foaming test (ISO / 12152), FZG gear machine test method (ASTM D5182 or DIN 51354), FAG roller bearing test (FE8 DIN51819-3) and FZG micropitting test (FVA 54). Among them, the FAG roller bearing test (DIN 51819-3, stage 1-4) mainly tests the weight loss of the bearing roller and retainer before and after the test of the oil product, thereby reflecting the protective performance of the oil product on the bearing. The test includes four stages, and the total test time is 2180 hours. The specific steps are as follows:

[0112] Procedure 1: Test the wear of the bearing under boundary lubrication conditions using a cylindrical thrust roller thrust bearing test. The test conditions are: bearing speed 7.5 RPM, test time 80 h, test temperature 80 ° C, load 100 kN.

[0113] Procedure 2: Test the fatigue characteristics of the bearing under mixed friction conditions using a cylindrical roller thrust bearing test. The test conditions are: bearing speed 75 RPM, test time 800 h, test temperature 70 ° C, load 100 kN.

[0114] Procedure 3: Test the fatigue characteristics of the bearing under elastic fluid dynamic lubrication conditions, using L11 deep groove ball bearings for testing. The test conditions are: bearing speed 9000RPM, test time 700h, test temperature 80℃, load 8.5kN.

[0115] Procedure 4: Test the fatigue characteristics and deposit tendency of the bearing under the condition of oil containing water, using a cylindrical roller thrust bearing test. The test conditions are: bearing speed 750RPM, test time 600h, test temperature 100℃, load 60kN, and water injection rate of 1 drop / 120 seconds.

[0116] The Flender foam test method is recognized by the industry as the closest test bench to evaluate the anti-foaming performance of lubricating oil and the actual working conditions of wind turbine gears. This test can highly simulate the actual working conditions of gearbox foaming, and is adopted in the Flender gear oil specification and IEC61400-4. The general requirement is that the volume increase after shutdown for 1 minute is not more than 15%, and the oil-gas mixture increase after 5 minutes is not more than 10%.

[0117] Embodiment 1:

[0118] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0119] Phosphorus-containing antiwear agent: 0.5% triphenyl phosphate;

[0120] Anti-micropitting additive: 0.1% sodium alkyl phenol sulfide with a total base number of 230;

[0121] Sediment control agent: 0.2% of boronized high molecular weight polyisobutylene succinimide with a molecular weight of 2500 to 4000;

[0122] Antioxidant: 0.2% 2,6-di-tert-butyl-p-cresol, 0.2% dodecyl diphenylamine;

[0123] Metal deactivator: 0.2% N,N-dioctylaminomethylenebenzotriazole, 0.33% N,N-dinonylaminomethylenebenzotriazole;

[0124] Rust inhibitor: 0.05% diisooctyl phosphate octadecylamine salt;

[0125] Composite antifoaming agent: a mixture of 0.005% polyacrylate with a molecular weight of 20,000 and 0.005% perfluoropolyether condensate with a molecular weight of 50,000; 0.09% diluent oil is No. 2 industrial white oil with a boiling point of 200°C;

[0126] Synthetic base oil: 63.7975% of mPAO 65 prepared by metallocene catalytic polymerization process, 34.3525wt% of di(2-ethylhexyl) sebacate base oil.

[0127] Embodiment 2:

[0128] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0129] Phosphorus antiwear agent: 2.5% phosphate amine salt;

[0130] Anti-micropitting additive: 1% sodium alkyl phenol sulfide with a total base number of 230;

[0131] Sediment control agent: 1.5% of boronized high molecular weight polyisobutylene succinimide with a molecular weight of 2500 to 4000;

[0132] Antioxidant: 1% 2,6-di-tert-butyl-p-cresol, 1% dodecyl diphenylamine;

[0133] Metal deactivator: 0.2% N,N-dioctylaminomethylenebenzotriazole, 0.3% N,N-dinonylaminomethylenebenzotriazole;

[0134] Rust inhibitor: 1% diisooctyl phosphate octadecylamine salt;

[0135] Composite antifoaming agent: a mixture of 0.012% polyacrylate with a molecular weight of 20,000 and 0.008% perfluoropolyether condensate with a molecular weight of 50,000; 0.18% diluent oil is No. 2 industrial white oil with a boiling point of 200°C;

[0136] Synthetic base oil: 77.605% of mPAO 65 prepared by metallocene catalytic polymerization process, 13.695wt% of di(2-ethylhexyl) sebacate base oil.

[0137] Embodiment 3:

[0138] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0139] Phosphorus-containing antiwear agent: 2.5% alkyl thiophosphate;

[0140] Anti-micropitting additives: 0.5% sodium alkylphenol sulfide with a total base number of 230 and 0.5% calcium alkyl salicylate with a total base number of 350;

[0141] Sediment control agent: 1% of boronized high molecular weight polyisobutylene succinimide with a molecular weight of 2500 to 4000;

[0142] Antioxidant: 0.2% 2,6-di-tert-butyl-p-cresol, 0.8% dodecyl diphenylamine;

[0143] Metal deactivator: 0.01% N,N-dioctylaminomethylenebenzotriazole, 0.02% N,N-dinonylaminomethylenebenzotriazole;

[0144] Rust inhibitor: 0.05% diisooctyl phosphate octadecylamine salt;

[0145] Composite antifoaming agent: a mixture of 0.01% polyacrylate with a molecular weight of 20,000 and 0.01% perfluoropolyether condensate with a molecular weight of 50,000; 0.18% diluent oil is No. 2 industrial white oil with a boiling point of 200°C;

[0146] Synthetic base oil: 70.8% of mPAO 65 prepared by metallocene catalytic polymerization process, 23.6wt% of di(2-ethylhexyl) sebacate base oil.

[0147] Embodiment 4:

[0148] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0149] Phosphorus-containing antiwear agent: 0.2% phosphate amine salt, 0.5% triphenyl phosphate, 0.15% alkyl dithiophosphate;

[0150] Anti-micropitting additive: 0.2% sodium alkyl phenol sulfide with a total base number of 230;

[0151] Sediment control agent: 0.4% of boronized high molecular weight polyisobutylene succinimide with a molecular weight of 2500 to 4000;

[0152] Antioxidant: 0.3% 2,6-di-tert-butyl-p-cresol, 0.4% dodecyl diphenylamine;

[0153] Metal deactivator: 0.01% N,N-dioctylaminomethylenebenzotriazole, 0.05% N,N-dinonylaminomethylenebenzotriazole;

[0154] Rust inhibitor: 0.4% diisooctyl phosphate octadecylamine salt;

[0155] Composite antifoaming agent: a mixture of 0.0075% polyacrylate with a molecular weight of 20,000 and 0.0075% perfluoropolyether condensate with a molecular weight of 50,000; 0.135% diluent oil is No. 2 industrial white oil with a boiling point of 200°C;

[0156] Synthetic base oil: 65.39% of mPAO 65 prepared by metallocene catalytic polymerization process, 31.85wt% of di(2-ethylhexyl) sebacate base oil.

[0157] Embodiment 5:

[0158] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0159] Phosphorus-containing antiwear agent: 0.2% phosphate amine salt, 0.5% triphenyl phosphate, 0.15% alkyl dithiophosphate;

[0160] Anti-micropitting additive: 0.2% sodium alkyl phenol sulfide with a total base number of 230;

[0161] Sediment control agent: 0.4% of boronized high molecular weight polyisobutylene succinimide with a molecular weight of 2500 to 4000;

[0162] Antioxidant: 0.3% 2,6-di-tert-butyl-p-cresol, 0.4% dodecyl diphenylamine;

[0163] Metal deactivator: 0.01% N,N-dioctylaminomethylenebenzotriazole, 0.05% N,N-dinonylaminomethylenebenzotriazole;

[0164] Rust inhibitor: 0.4% diisooctyl phosphate octadecylamine salt;

[0165] Composite antifoaming agent: 0.01% of a mixture of polyacrylate with a molecular weight of 20,000 and 0.005% of a perfluoropolyether condensate with a molecular weight of 50,000; 0.135% of the diluent oil is No. 2 industrial white oil with a boiling point of 200°C;

[0166] Synthetic base oil: 65.39% of mPAO 65 prepared by metallocene catalytic polymerization process, 31.85wt% of di(2-ethylhexyl) sebacate base oil.

[0167] Embodiment 6:

[0168] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0169] Phosphorus-containing antiwear agent: 0.2% phosphate amine salt, 0.5% triphenyl phosphate, 0.15% alkyl dithiophosphate;

[0170] Anti-micropitting additive: 0.2% sodium alkyl phenol sulfide with a total base number of 230;

[0171] Sediment control agent: 0.4% of boronized high molecular weight polyisobutylene succinimide with a molecular weight of 2500 to 4000;

[0172] Antioxidant: 0.3% 2,6-di-tert-butyl-p-cresol, 0.4% dodecyl diphenylamine;

[0173] Metal deactivator: 0.01% N,N-dioctylaminomethylenebenzotriazole, 0.05% N,N-dinonylaminomethylenebenzotriazole;

[0174] Rust inhibitor: 0.4% diisooctyl phosphate octadecylamine salt;

[0175] Composite antifoaming agent: 0.01% of polyacrylate with a molecular weight of 20,000, 0.005% of a mixture of perfluoropolyether condensates with a molecular weight of 50,000; 0.135% of the diluent oil is No. 2 industrial white oil with a boiling point of 200°C;

[0176] Synthetic base oil: 65.39% of mPAO 65 prepared by metallocene catalytic polymerization process, 31.85wt% of di(2-ethylhexyl) sebacate base oil.

[0177] Table 1 Composition and properties of No. 150 base oil

[0178]

[0179] Example 4, Example 5 and Example 6 use the lubricating oil anti-foaming performance determination method GB / T 12579 or ASTM D892, Flender anti-foaming test ISO / 12152 to test the anti-foaming performance of new oil and oil after artificial aging. The test results are shown in Table 2.

[0180] Table 2 Test results of the compositions of Examples 4, 5 and 6

[0181]

[0182]

[0183] Note: Artificially aged oil refers to oil samples that have been placed in copper and steel sheets and oxidized in an oven at 110°C for 200 hours.

[0184] The results in Table 2 show that (1) the type and proportion of antifoaming agents have a great influence on the antifoaming properties of oil products, especially the antifoaming properties of aged oil products; (2) the product of the present invention uses antifoaming agents of special structure and proper proportions to make new oil, especially aged oil, have good antifoaming properties.

[0185] Embodiment 7:

[0186] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0187] Phosphorus-containing antiwear agent: 0.1% phosphate amine salt, 1.05% triphenyl phosphate, 0.6% alkyl dithiophosphate;

[0188] Anti-micropitting additive: 0.8% calcium alkyl salicylate with a total base number of 350;

[0189] The sediment control agent 0.2% has a molecular weight of 2500 to 4000 polyisobutylene succinimide;

[0190] Antioxidant: 0.3% 2,6-di-tert-butyl-p-cresol, 0.4% tetradecyl diphenylamine;

[0191] Metal deactivator: 0.497% 2,5-di(tert-dodecyldisulfide)-thiadiazole dimer;

[0192] Rust inhibitor: 0.05% di-n-butyl phosphate octadecylamine salt;

[0193] Composite antifoaming agent: a mixture of 0.0002% polyacrylate with a molecular weight of 20,000 and 0.0001% perfluoropolyether condensate with a molecular weight of 50,000; 0.0027% diluent oil is No. 2 industrial white oil with a boiling point of 200°C;

[0194] Synthetic base oil: 68.0% mPAO 65 prepared by metallocene catalytic polymerization process, 14.0wt% diisodecyl sebacate, 14.0wt% pentaerythritol tetracaprylate base oil.

[0195] Embodiment 8:

[0196] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0197] Phosphorus-containing antiwear agent: 1.15% triphenyl phosphate, 0.6% alkyl dithiophosphate;

[0198] Anti-micropitting additive: 0.8% calcium alkyl salicylate with a total base number of 350;

[0199] The sediment control agent 0.2% has a molecular weight of 2500 to 4000 polyisobutylene succinimide;

[0200] Antioxidant: 0.3% 2,6-di-tert-butyl-p-cresol, 0.4% tetradecyl diphenylamine;

[0201] Metal deactivator: 0.497% 2,5-di(tert-dodecyldisulfide)-thiadiazole dimer;

[0202] Rust inhibitor: 0.05% di-n-butyl phosphate octadecylamine salt;

[0203] Composite antifoaming agent: a mixture of 0.0002% polyacrylate with a molecular weight of 20,000 and 0.0001% perfluoropolyether condensate with a molecular weight of 50,000; 0.0027% diluent oil is No. 2 industrial white oil with a boiling point of 200°C;

[0204] Synthetic base oil: 68.0% mPAO 65 prepared by metallocene catalytic polymerization process, 14.0wt% diisodecyl sebacate, 14.0wt% pentaerythritol tetracaprylate base oil.

[0205] Embodiment 9:

[0206] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0207] Phosphorus-containing antiwear agent: 1.75% triphenyl phosphate;

[0208] Anti-micropitting additive: 0.8% calcium alkyl salicylate with a total base number of 350;

[0209] The sediment control agent 0.2% has a molecular weight of 2500 to 4000 polyisobutylene succinimide;

[0210] Antioxidant: 0.3% 2,6-di-tert-butyl-p-cresol, 0.4% tetradecyl diphenylamine;

[0211] Metal deactivator: 0.497% 2,5-di(tert-dodecyldisulfide)-thiadiazole dimer;

[0212] Rust inhibitor: 0.05% di-n-butyl phosphate octadecylamine salt;

[0213] Composite antifoaming agent: a mixture of 0.0002% of polyacrylate with a molecular weight of 20,000 and 0.0001% of perfluoropolyether condensate with a molecular weight of 50,000; 0.0027% of diluent oil is No. 2 industrial white oil with a boiling point of 200°C.

[0214] Synthetic base oil: 68.0% mPAO 65 prepared by metallocene catalytic polymerization process, 14.0wt% diisodecyl sebacate, 14.0wt% pentaerythritol tetracaprylate base oil.

[0215] Table 3 Composition and properties of No. 220 base oil

[0216]

[0217] Table 4 Test results of bearing protection performance of the compositions of Example 7, Example 8 and Example 9 (DIN51819-3, stage 1) 注

[0218]

[0219] Note: DIN51819-3 contains four test phases, and this part of the test only conducts the first phase test.

[0220] The results in Table 4 show that phosphorus-containing antiwear agents with different structural formulas can have a significant impact on the bearing protection performance of oil products:

[0221] The bearing protection performance of the mixture of phosphate amine salt and triphenyl phosphate, or the mixture of phosphate amine salt, triphenyl phosphate and alkyl thiophosphate is better than that of the oil product using triphenyl phosphate alone. The phosphorus-containing anti-wear agent with a special structure used in the present invention can significantly reduce the bearing wear of the oil product and greatly extend the service life of the bearing.

[0222] Embodiment 10:

[0223] Based on the total mass of the megawatt-class wind turbine gear lubricant composition, the composition is prepared according to the following percentages:

[0224] Phosphorus-containing antiwear agent: 0.4% phosphate amine salt, 0.5% triphenyl phosphate, 0.1% alkyl dithiophosphate;

[0225] Anti-micropitting additive: 0.1% alkyl phenol magnesium sulphide with a total base number of 212;

[0226] Sediment control agent: 0.8% of polyisobutylene succinimide with a molecular weight of 2500-4000, and 0.2% of boronized high molecular weight polyisobutylene succinimide with a molecular weight of 2500-4000;

[0227] Antioxidant: 0.6% 2,6-di-tert-butyl-p-cresol, 0.8% hexadecyl diphenylamine;

[0228] Metal deactivator: 0.05% 2.5-di(tert-nonyldithio)-thiadiazole dimer, 0.01% N,N-dioctylaminomethylenebenzotriazole, 0.04% N,N-dinonylaminomethylenebenzotriazole;

[0229] Rust inhibitor: 0.08% n-butyl isooctyl phosphate octadecylamine salt;

[0230] Composite antifoaming agent: a mixture of 0.001% polyacrylate with a molecular weight of 20,000 and 0.001% perfluoropolyether condensate with a molecular weight of 50,000; 0.018% diluent oil is No. 2 industrial white oil with a boiling point of 200°C.

[0231] Synthetic base oil: 84.3% mPAO65 prepared by metallocene catalytic polymerization process, 4.0wt% diisooctyl azelate, 4.0wt% isotridecyl sebacate, 4.0wt% pentaerythritol tetrapelargonate base oil.

[0232] Table 5 Composition and properties of No. 320 base oil

[0233]

[0234] Table 6 Evaluation results of Example 10

[0235]

[0236]

[0237]

[0238] The results show that the MW wind turbine gear lubricant composition of Example 7 passed the lubricant anti-foam test, Flender anti-foam test, FZG gear machine test, FAG roller bearing test and FZG anti-micropitting test. It has excellent anti-scratch, anti-micropitting and sediment control performance, and still has good anti-foam performance after precision filtration during long-term use. The outstanding feature is that it has excellent bearing protection performance. It can meet the lubrication of the surface-hardened main gearbox, yaw reduction box and pitch reduction box in the gear transmission system of wind turbines above 1.5 megawatts.

Claims

1. A megawatt-class wind turbine gear lubricant composition, characterized in that: According to the mass fraction, it is composed of the following components: phosphorus-containing antiwear agent: 0.85% to 1.75%; anti-micropitting additive: 0.1% to 0.8%; deposit control agent: 0.2% to 1%; antioxidant: 0.7% to 1.4%; metal deactivator: 0.06% to 0.5%; rust inhibitor: 0.05% to 1%; composite antifoaming agent: 0.003% to 0.15%; synthetic base oil: 91.3% to 97.24%; the sum of the mass percentages of the above components is 100%; The phosphorus-containing antiwear agent is at least one of phosphate amine salt, triphenyl phosphate, and alkyl thiophosphate; The anti-micropitting additive is at least one of an alkyl salicylate and a sulphurised alkyl phenol; The deposit control agent is at least one of polyisobutylene succinimide and boronized polymer polyisobutylene succinimide; The metal deactivator is at least one of alkylthiadiazole dimer, N,N-dinonylaminomethylenebenzotriazole, and N,N-dioctylaminomethylenebenzotriazole; The composite antifoaming agent is a mixture of a polyacrylate with a molecular weight of 20,000 and a perfluoropolyether condensate with a number average molecular weight of 50,000 and a diluent oil of No. 2 industrial white oil with a boiling point of 200°C; the mass ratio of the mixture of the polyacrylate with a molecular weight of 20,000 and the perfluoropolyether condensate with a number average molecular weight of 50,000 to the diluent oil of No. 2 industrial white oil with a boiling point of 200°C is 1:9; The mass ratio of the polyacrylate to the perfluoropolyether condensate is 1:1 to 2:

1. The structural formula of the alkyl salicylate is: Wherein R8 is an alkyl group containing 8 to 18 carbon atoms, M is K or Mg or Ca or Na, and the total base number is 300 to 350 mg / g in terms of KOH; The structural formula of the sulphurized alkyl phenol salt is: Wherein R9 is an alkyl group containing 8 to 18 carbon atoms, x is a positive integer, N is K or Mg or Ca or Na, and the total base number is 210 to 230 mg / g in terms of KOH; The rust inhibitor is diisooctyl phosphate octadecene amine salt; The synthetic base oil is a composition of poly α-olefin and ester base oil, and the poly α-olefin accounts for 65% to 85% of the mass of the composition of poly α-olefin and ester base oil; The poly α-olefin is a poly α-olefin mPAO base oil prepared by a metallocene catalytic polymerization process; the ester base oil is at least one of diisooctyl azelate, isotridecyl sebacate, diisodecyl sebacate, di(2-ethylhexyl) sebacate, pentaerythritol tetraisooctanoate, pentaerythritol tetrapelargonate, and pentaerythritol tetradecanoate.

2. The megawatt-class wind turbine gear lubricating oil composition according to claim 1, characterized in that: The structural formula of the phosphate amine salt is: Among them, R1 is a straight chain or branched C4~C8 hydrocarbon group, R2 is a hydrogen atom or a straight chain or branched C4~C8 hydrocarbon group; R3 is a straight chain or branched C8~C18 hydrocarbon group.

3. The megawatt-class wind turbine gear lubricating oil composition according to claim 1, characterized in that: The structural formula of the triphenyl phosphate is: In the formula, R4, R5 and R6 are the same and are straight-chain or branched C1-C20 hydrocarbon groups.

4. The megawatt-class wind turbine gear lubricating oil composition according to claim 1, characterized in that: The structural formula of the alkyl thiophosphate is: Wherein, R7 is a hydrogen atom or a linear or branched C4-C8 hydrocarbon group.

5. The megawatt-class wind turbine gear lubricating oil composition according to claim 1, characterized in that: The structural formula of the polyisobutylene succinimide is: Wherein PIB is polyisobutylene with a molecular weight of 2500 to 4000, and n is a positive integer.

6. The megawatt-class wind turbine gear lubricating oil composition according to claim 1, characterized in that: The structural formula of the boronated polymer polyisobutylene succinimide is: Wherein PIB is polyisobutylene with a molecular weight of 2500 to 4000, and n is a positive integer.

7. The megawatt-class wind turbine gear lubricating oil composition according to claim 1, characterized in that: The antioxidant is a composition of 2,6-di-tert-butyl-p-cresol and an aromatic amine antioxidant, and the mass ratio of the composition of 2,6-di-tert-butyl-p-cresol and an aromatic amine antioxidant is 1:4-3:

4.

8. The megawatt-class wind turbine gear lubricating oil composition according to claim 6, characterized in that: The mass ratio of the composition of 2,6-di-tert-butyl-p-cresol and aromatic amine antioxidant is 3:

4.

9. The megawatt-class wind turbine gear lubricating oil composition according to claim 6, characterized in that: The structural formula of the aromatic amine antioxidant is: Where R 10 and R 11 are the same or different, and represent a linear or branched C4-C18 hydrocarbon group, R 12 and R 13 The same represents a hydrogen atom or a methyl group.

10. The megawatt-class wind turbine gear lubricating oil composition according to claim 1, characterized in that: The structural formula of the alkylthiadiazole dimer is: Where R 14 and R 15 The same refers to a tertiary alkyl group of C9, C12, C16 or C18.

11. The megawatt-class wind turbine gear lubricant composition according to claim 1, characterized in that: The mass ratio of the polyacrylate to the perfluoropolyether condensate is 1:

1.

12. The method for preparing the megawatt-class wind turbine gear lubricant composition according to claim 1, characterized in that: Add all components into the blending kettle at once according to the mass fraction, stir them fully for 2 to 3 hours at 55 to 65° C., cool and filter the mixture until it becomes transparent, and take the filtrate as the megawatt-class wind turbine gear lubricating oil composition.

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