A kind of lubricating grease used for the gear of the yaw system of wind power generation equipment and its preparation method

Abstract

The present invention provides a grease applied to the gear of the yaw system of a wind power generation device and a preparation method thereof. The grease applied to the gear of the yaw system of a wind power generation device according to the present invention comprises the following components in parts by weight: 50 to 80 parts of PAO base oil, 40 to 60 parts of hydrogenated base oil, 0.5 to 5 parts of nano-lubricating composition, 5-10 parts of thickener, 1 to 3 parts of rust inhibitor, 1 to 3 parts of antioxidant, and 0.5 to 1 of pour point depressant. The grease prepared by the present invention has obvious extreme pressure resistance and wear resistance at high and low temperatures; even if it works under a large temperature difference for a long time, its performance will not be significantly reduced, which significantly increases the lifespan in extreme working environments and greatly reduces the cost of replacing lubricating oil and device wear; and the grease preparation method is simple, suitable for industrial production, and can be widely promoted and applied.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating grease, and in particular relates to a lubricating grease applied to a gear of a yaw system of a wind power generation device and a preparation method thereof. Background Art

[0002] Wind turbines can generally be divided into horizontal axis and vertical axis types. Horizontal axis wind turbines include gearbox wind turbines and direct drive wind turbines, while vertical axis wind turbines only have direct drive. Relatively speaking, gearbox wind turbines are more complex, have more complete functions, and are more widely used. At the same time, maintenance is more troublesome, and lubrication is one of the maintenance measures. In the past 20 years, wind power technology has become increasingly mature, the scale of application has become larger, and the installed capacity has continued to grow. The development of renewable energy represented by wind power has become a long-term strategy for countries around the world to cope with future energy and climate change pressures. Therefore, conducting research on improving the performance of wind power lubrication systems and increasing the life of wind power equipment has good economic and social benefits.

[0003] Wind turbine yaw system gear grease is mainly used for the lubrication of yaw system gears of large wind power generation equipment. The performance requirements of wind turbine yaw system gear grease are determined by the specific working conditions and lubrication characteristics of the yaw system gears of wind power generation equipment. The working principle of wind turbine generator is to convert the kinetic energy of air flow into mechanical energy through the action of the kinetic energy of air flow on the impeller, thereby driving the impeller to rotate. The shaft of the impeller is connected to the shaft of the generator through a gearbox, thereby driving the generator to generate electricity. The main parts of the wind turbine include blade bearings, main bearings, gearboxes, generator bearings, yaw system bearings and gears. The function of the yaw system is to make the swept area of ​​the wind rotor always perpendicular to the main wind direction. Although the speed is not high, the load that the yaw bearings and gears can bear is large. Therefore, the yaw system gears usually need to be lubricated with grease.

[0004] The yaw system is greatly affected by the climate and environment. Considering the high cost of wind power equipment, many equipment are located in remote areas with relatively harsh working environments. The ambient temperature can reach -20 to -40°C and 40 to 50°C, so the grease needs to have strong resistance to temperature changes. Currently, the extreme pressure resistant materials and lubricating materials in the grease will lose some of their performance when the temperature difference range is large.

[0005] Therefore, there is an urgent need for a lubricating grease that is both resistant to low temperatures and high temperatures. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a lubricating grease for use in the gears of the yaw system of a wind power generation equipment. The lubricating grease of the present invention has obvious extreme pressure resistance and wear resistance at high and low temperatures and has a long service life.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a lubricating grease for use in a yaw system gear of a wind power generation device, comprising the following components in parts by weight:

[0009]

[0010] Preferably, the kinematic viscosity of the PAO base oil at 40°C is 3200-3500 mm 2 / s, pour point not higher than -30℃.

[0011] Further preferably, the PAO base oil is mPAO 300.

[0012] Preferably, the kinematic viscosity of the hydrogenated base oil at 40°C is 4000-4200 mm 2 / s, pour point not higher than -40℃.

[0013] By adopting the above technical solution, the present invention uses a base oil with high kinematic viscosity and low pour point to improve the high temperature / low temperature resistance of the matrix, so that it can ensure the most basic working performance.

[0014] Preferably, the preparation method of the nano-lubricating composition is:

[0015] (1) preparing porous nanoparticles;

[0016] (2) sodium molybdate, thiourea and deionized water are mixed in a mass ratio of (3-10):(5-15):100 to obtain a mixed solution A;

[0017] (3) mixing the porous nanoparticles with the mixed solution A in a mass ratio of 1:(1-10) and reacting the mixture at 180-220° C. for 12-24 hours to obtain first modified particles;

[0018] (4) mixing silver nitrate, polyvinyl pyrrolidone and anhydrous ethanol in a mass ratio of (1-10):(5-15):100 to obtain a mixed solution B;

[0019] (5) mixing the first modified particles with the mixed solution B in a mass ratio of 1:(1-10) and reacting at 180-220° C. for 12-24 h to obtain second modified particles;

[0020] (6) The second modified particles and 1-(4-ethylphenyl)nonane-1,3-dione are mixed in a mass ratio of 1:(1-10) and subjected to vacuum assisted adsorption to obtain a nano-lubricating composition.

[0021] By adopting the above technical scheme, the present invention loads a coating containing Mo and Ag with self-lubricating properties on ceramic particles, and the two have good lubrication ability at low temperatures; when the temperature rises, the silver molybdate produced due to friction and other reasons obviously helps to further reduce the friction coefficient; thereby overcoming the problem of increased friction caused by high temperature; further, the present invention adsorbs 1-(4-ethylphenyl) nonane-1,3-dione on the porous particles of the load coating, which can achieve super-slippery on the metal surface by slowly releasing it, and generates a tribochemical reaction with the steel surface at high temperature to generate a chelate soluble in β-diketone itself, and gradually eliminates solid contact, converting the mechanical friction between the solid surfaces (i.e., external friction) into collision and entanglement (i.e., internal friction) between the lubricating oil β-diketone molecules. Therefore, the nano-lubricating composition improves the high temperature / low temperature resistance of the grease.

[0022] Preferably, the porous nanoparticles are porous carbon or porous metal ceramics; the particle size of the porous nanoparticles is 40 to 200 nm.

[0023] Preferably, the thickener is a fatty acid complex metal soap.

[0024] Preferably, the rust inhibitor is any one or more of alkenyl succinic acid T746, barium dinonylnaphthalenesulfonate T705, barium petroleum sulfonate, barium nonylnaphthalenesulfonate, and neutral barium dinonylnaphthalenesulfonate.

[0025] Preferably, the antioxidant is any one or more of diphenylamine, p-phenylenediamine and 2,6-di-tert-butyl-4-methylphenol.

[0026] Preferably, the pour point depressant is polymethacrylate C14-16 alkyl ester.

[0027] The present invention also provides a method for preparing the above-mentioned grease, comprising the following steps:

[0028] Weigh the raw materials according to the weight parts;

[0029] After heating PAO base oil and hydrogenated base oil to 100°C, a nano-lubricating composition and a thickener are added, and then the temperature is raised to 220°C for refining for 10 minutes. After the temperature drops to 80°C, a rust inhibitor, an antioxidant and a pour point depressant are added and mixed evenly to obtain a grease for the yaw system gear of a wind power generation equipment.

[0030] Contains at least the following beneficial technical effects:

[0031] The lubricating grease prepared by the present invention has obvious extreme pressure resistance and wear resistance at high and low temperatures; even if it works under a large temperature difference for a long time, its performance will not be significantly reduced, which significantly increases the service life in extreme working environments and greatly reduces the cost of replacing lubricating oil and device wear;

[0032] Moreover, the grease preparation method is simple, suitable for industrial production, and can be widely promoted and applied. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0034] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0035] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0036] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present application description and examples are exemplary only.

[0037] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0038] The "room temperature" and "normal temperature" mentioned in the present invention are all calculated as 25±2°C unless otherwise specified.

[0039] The raw materials used in the following examples of the present invention are commercially available unless otherwise specified.

[0040] Example 1

[0041] (1) Preparation of nano-lubricating composition:

[0042] Sodium molybdate, thiourea and deionized water are mixed in a mass ratio of 6:8:100 to obtain a mixed solution A;

[0043] The porous ceramic particles with a particle size of 100 nm and the mixed solution A were mixed in a mass ratio of 1:2 and reacted at 200° C. for 18 h to obtain the first modified particles;

[0044] Silver nitrate, polyvinyl pyrrolidone and anhydrous ethanol are mixed in a mass ratio of 6:8:100 to obtain a mixed solution B;

[0045] The first modified particles and the mixed solution B are mixed in a mass ratio of 1:2 and reacted at 180-220° C. for 18 hours to obtain second modified particles;

[0046] The second modified particles and 1-(4-ethylphenyl)nonane-1,3-dione are mixed in a mass ratio of 1:1 and vacuum-assisted adsorption is performed to obtain a nano-lubricating composition.

[0047] (2) Weigh 60 parts of mPAO 300 base oil, 50 parts of hydrogenated base oil, 2 parts of nano-lubricating composition, 8 parts of thickener, 2 parts of rust inhibitor, 2 parts of antioxidant, and 0.5 parts of pour point depressant by weight;

[0048] The kinematic viscosity of mPAO 300 base oil at 40°C is 3300 mm 2 / s, pour point not higher than -30℃;

[0049] The kinematic viscosity of the hydrogenated base oil at 40°C is 4100 mm 2 / s, pour point not higher than -40℃;

[0050] The thickener is fatty acid composite metal soap; the rust inhibitor is ethylene succinic acid T746; the antioxidant is diphenylamine; and the pour point depressant is polymethacrylate C14-16 alkyl ester.

[0051] (3) After the mPAO 300 base oil and the hydrogenated base oil are heated to 100°C, the nano-lubricating composition and the thickener are added, and then the temperature is raised to 220°C for refining for 10 minutes. After the temperature is reduced to 80°C, a rust inhibitor, an antioxidant, and a pour point depressant are added and mixed evenly to obtain a grease for the yaw system gear of a wind power generation equipment.

[0052] Example 2

[0053] (1) Preparation of nano-lubricating composition:

[0054] Sodium molybdate, thiourea and deionized water are mixed in a mass ratio of 3:5:100 to obtain a mixed solution A;

[0055] The porous ceramic particles with a particle size of 40 nm and the mixed solution A were mixed in a mass ratio of 1:1 and reacted at 180° C. for 12 h to obtain the first modified particles;

[0056] Silver nitrate, polyvinyl pyrrolidone and anhydrous ethanol are mixed in a mass ratio of 1:5:100 to obtain a mixed solution B;

[0057] The first modified particles and the mixed solution B were mixed at a mass ratio of 1:5 and reacted at 180° C. for 12 h to obtain second modified particles;

[0058] The second modified particles and 1-(4-ethylphenyl)nonane-1,3-dione were mixed at a mass ratio of 1:5 and vacuum-assisted adsorption was performed to obtain a nano-lubricating composition.

[0059] (2) Weigh 50 parts of mPAO 300 base oil, 40 parts of hydrogenated base oil, 0.5 parts of nano-lubricating composition, 5 parts of thickener, 1 part of rust inhibitor, 1 part of antioxidant, and 0.5 parts of pour point depressant by weight;

[0060] The kinematic viscosity of mPAO 300 base oil at 40°C is 3200 mm 2 / s, pour point not higher than -30℃;

[0061] The kinematic viscosity of the hydrogenated base oil at 40°C is 4000 mm 2 / s, pour point not higher than -40℃;

[0062] The thickener is fatty acid composite metal soap; the rust inhibitor is petroleum barium sulfonate; the antioxidant is 2,6-di-tert-butyl-4-methylphenol; and the pour point depressant is polymethacrylate C14-16 alkyl ester.

[0063] (3) After the mPAO 300 base oil and the hydrogenated base oil are heated to 100°C, the nano-lubricating composition and the thickener are added, and then the temperature is raised to 220°C for refining for 10 minutes. After the temperature is reduced to 80°C, a rust inhibitor, an antioxidant, and a pour point depressant are added and mixed evenly to obtain a grease for the yaw system gear of a wind power generation equipment.

[0064] Example 3

[0065] (1) Preparation of nano-lubricating composition:

[0066] Sodium molybdate, thiourea and deionized water are mixed in a mass ratio of 10:15:100 to obtain a mixed solution A;

[0067] The porous ceramic particles with a particle size of 200 nm and the mixed solution A were mixed in a mass ratio of 1:10 and reacted at 220° C. for 24 hours to obtain the first modified particles;

[0068] Silver nitrate, polyvinyl pyrrolidone and anhydrous ethanol are mixed in a mass ratio of 10:15:100 to obtain a mixed solution B;

[0069] The first modified particles and the mixed solution B were mixed at a mass ratio of 1:10 and reacted at 220° C. for 24 hours to obtain second modified particles;

[0070] The second modified particles and 1-(4-ethylphenyl)nonane-1,3-dione were mixed at a mass ratio of 1:10 and vacuum-assisted adsorption was performed to obtain a nano-lubricating composition.

[0071] (2) Weigh 80 parts of mPAO 300 base oil, 60 parts of hydrogenated base oil, 5 parts of nano-lubricating composition, 10 parts of thickener, 3 parts of rust inhibitor, 3 parts of antioxidant, and 1 part of pour point depressant by weight;

[0072] The kinematic viscosity of mPAO 300 base oil at 40°C is 3500 mm 2 / s, pour point not higher than -30℃;

[0073] The kinematic viscosity of the hydrogenated base oil at 40°C is 4200 mm 2 / s, pour point not higher than -40℃;

[0074] The thickener is fatty acid composite metal soap; the rust inhibitor is neutral barium dinonylnaphthalenesulfonate; the antioxidant is p-phenylenediamine; and the pour point depressant is polymethacrylate C14-16 alkyl ester.

[0075] (3) After the mPAO 300 base oil and the hydrogenated base oil are heated to 100°C, the nano-lubricating composition and the thickener are added, and then the temperature is raised to 220°C for refining for 10 minutes. After the temperature is reduced to 80°C, a rust inhibitor, an antioxidant, and a pour point depressant are added and mixed evenly to obtain a grease for the yaw system gear of a wind power generation equipment.

[0076] Comparative Example 1

[0077] The preparation method of this comparative example is the same as that of Example 1, except that no nano-lubricating composition is added.

[0078] Comparative Example 2

[0079] The preparation method of this comparative example is the same as that of Example 1, except that the method for preparing the nano-lubricating composition is:

[0080] Sodium molybdate, thiourea and deionized water are mixed in a mass ratio of 10:15:100 to obtain a mixed solution A;

[0081] The porous ceramic particles with a particle size of 200 nm and the mixed solution A were mixed in a mass ratio of 1:10 and reacted at 220° C. for 24 hours to obtain the first modified particles;

[0082] Silver nitrate, polyvinyl pyrrolidone and anhydrous ethanol are mixed in a mass ratio of 10:15:100 to obtain a mixed solution B;

[0083] The first modified particles and the mixed solution B were mixed in a mass ratio of 1:10 and reacted at 220° C. for 24 hours to obtain a nano-lubricating composition;

[0084] The second modified particles and the PAO base oil were mixed in a mass ratio of 1:10 and vacuum-assisted adsorption was performed to obtain a nano-lubricating composition.

[0085] Comparative Example 3

[0086] The preparation method of this comparative example is the same as that of Example 1, except that the nano-lubricating composition is prepared by mixing 400 nm porous ceramic particles and PAO base oil in a mass ratio of 1:10 and performing vacuum assisted adsorption to obtain the nano-lubricating composition.

[0087] Experimental example

[0088] The properties of the grease tested are shown in Table 1.

[0089] Table 1

[0090]

[0091]

[0092] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A grease for use in a yaw system gear of a wind power generation device, characterized in that: The composition comprises the following components in parts by weight:

2. The lubricating grease according to claim 1, characterized in that The kinematic viscosity of the PAO base oil at 40°C is 3200-3500 mm 2 / s, pour point not higher than -30℃.

3. The lubricating grease according to claim 1, characterized in that: The kinematic viscosity of the hydrogenated base oil at 40°C is 4000-4200 mm 2 / s, pour point not higher than -40℃.

4. The lubricating grease according to claim 1, characterized in that: The preparation method of the nano-lubricating composition is: (1) preparing porous nanoparticles; (2) sodium molybdate, thiourea and deionized water are mixed in a mass ratio of (3-10):(5-15):100 to obtain a mixed solution A; (3) mixing the porous nanoparticles with the mixed solution A in a mass ratio of 1:(1-10) and reacting the mixture at 180-220° C. for 12-24 hours to obtain first modified particles; (4) mixing silver nitrate, polyvinyl pyrrolidone and anhydrous ethanol in a mass ratio of (1-10):(5-15):100 to obtain a mixed solution B; (5) mixing the first modified particles with the mixed solution B in a mass ratio of 1:(1-10) and reacting at 180-220° C. for 12-24 h to obtain second modified particles; (6) The second modified particles and 1-(4-ethylphenyl)nonane-1,3-dione are mixed in a mass ratio of 1:(1-10) and subjected to vacuum assisted adsorption to obtain a nano-lubricating composition.

5. The lubricating grease according to claim 1, characterized in that: The porous nanoparticles are porous carbon or porous metal ceramics; the particle size of the porous nanoparticles is 40-200 nm.

6. The lubricating grease according to claim 1, characterized in that: The thickener is a fatty acid composite metal soap.

7. The lubricating grease according to claim 1, characterized in that The rust inhibitor is any one or more of alkenyl succinic acid T746, dinonylnaphthalene sulfonic acid barium salt T705, barium petroleum sulfonate, barium nonylnaphthalene sulfonate, and neutral dinonylnaphthalene sulfonate.

8. The lubricating grease according to claim 1, characterized in that The antioxidant is any one or more of diphenylamine, p-phenylenediamine and 2,6-di-tert-butyl-4-methylphenol.

9. The lubricating grease according to claim 1, characterized in that: The pour point depressant is polymethacrylate C14-16 alkyl ester.

10. The method for preparing the lubricating grease according to any one of claims 1 to 9, characterized in that: The following steps are involved: Weigh the raw materials according to the weight parts; After heating PAO base oil and hydrogenated base oil to 100°C, a nano-lubricating composition and a thickener are added, and then the temperature is raised to 220°C for refining for 10 minutes. After the temperature drops to 80°C, a rust inhibitor, an antioxidant and a pour point depressant are added and mixed evenly to obtain a grease for the yaw system gear of a wind power generation equipment.

Images