Self-repairing lubricating additive for gearbox of wind turbine generator

Abstract

The invention discloses a self-repairing lubricating additive for a gearbox of a wind turbine generator, and relates to the technical field of lubricating additives, the self-repairing lubricating additive for the gearbox of the wind turbine generator comprises layered silicate particles; layered silicate particles are used as a main component of the additive, a proper amount of the obtained additive is added into wind turbine generator gearbox lubricating oil, the lubricating oil can be endowed with the wear self-repairing capacity, the lubricating performance of the lubricating oil can be improved, the friction force of the surfaces of a gear and a bearing is reduced, and the service life of the lubricating oil is prolonged. Abrasion on the surfaces of the gear and the bearing is repaired immediately, the abrasion speed of the gear and the bearing is reduced, and the service life of the gearbox is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating additives, and in particular to a self-repairing lubricating additive for a gearbox of a wind turbine generator set. Background Art

[0002] Unplanned failures are the main challenge faced by the wind turbine industry. Design defects, environmental conditions, lack of or even incorrect maintenance may lead to unforeseen failures. At present, typical damage to wind turbine gearboxes includes micropitting, friction corrosion, corrosion indentation, chemical corrosion, electrical damage, etching, peeling, etc. If these damages are not treated, the service life of the gearbox will be seriously affected.

[0003] Currently, gearbox damage is mitigated through the following three approaches: (1) reducing or controlling the conditions that cause gear and bearing damage; (2) improving the wear resistance and corrosion resistance of gears and bearings; and (3) allowing gears and bearings to form a new compensation layer during the wear process to compensate for the wear, i.e., self-repairing wear. Self-repairing lubricant is a lubricant with self-repairing damage function. It contains special additives that can quickly gather in the wear area when damage occurs and form a protective film to repair the wear. This immediate response mechanism effectively slows down the wear rate of the gearbox, thereby significantly extending the service life of the gearbox. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a self-repairing lubricating additive for a wind turbine gearbox, which has layered silicate particles as the main component. Adding an appropriate amount of the self-repairing lubricating additive to the lubricating oil can not only give the lubricating oil the ability to self-repair wear, but also improve the lubricating performance of the lubricating oil.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0006] The invention provides a self-repairing lubricating additive for a gearbox of a wind turbine generator set, comprising layered silicate particles.

[0007] Furthermore, the layered silicate particles are obtained by drying, crushing and grinding layered silicate.

[0008] Furthermore, the layered silicate includes, but is not limited to, one or more of montmorillonite, bentonite, kaolin, talc, zeolite, vermiculite, and mica.

[0009] Furthermore, the drying is atmospheric pressure drying or vacuum drying. Free water and other low-boiling impurities in the layered silicate are removed by drying.

[0010] Furthermore, the grinding is carried out in a ball mill, which has the advantages of low energy consumption, high efficiency, zero pollution, etc. in production and can meet the needs of large-scale production.

[0011] Furthermore, the self-repairing lubricant additive also includes an antioxidant. During use, the lubricating oil will inevitably come into contact with air and oxidize, causing the lubricating oil to deteriorate and shorten the service life of the lubricating oil. The role of the antioxidant is to slow down the oxidation process of the lubricating oil and extend the service life of the lubricating oil.

[0012] Furthermore, the antioxidant is one or more of phenolic antioxidants and amine antioxidants.

[0013] Furthermore, the self-repairing lubricating additive also includes an extreme pressure anti-wear agent. An extreme pressure anti-wear agent is a heavy-duty additive that forms an extreme pressure lubricating film with the friction pair surface under extremely harsh conditions such as high temperature and high pressure. When the contact pressure of the friction surface is high, the extreme pressure anti-wear agent chemically reacts with the metal surface to form a protective film to prevent wear and sintering of the metal surface.

[0014] Furthermore, the extreme pressure anti-wear agent is one or more of organic chlorides, organic sulfides, organic phosphides, organic metal salts, and borates.

[0015] The self-repairing lubricating additive may also include a viscosity index improver, a foam inhibitor, a corrosion and rust inhibitor, a dispersant, etc. commonly used in the art.

[0016] Furthermore, the self-repairing lubricant additive is added to the lubricant in an amount of 0.5 to 5 wt%. Additives are an indispensable component of lubricants, which can improve the performance of lubricants and enhance their anti-wear, anti-oxidation, anti-corrosion and other properties. The self-repairing lubricant additive is insoluble in lubricants and does not chemically react with lubricants. It can give lubricants significant self-repairing wear capabilities, effectively slowing down the wear rate of gears and bearings, thereby extending the service life of the gearbox.

[0017] The present invention also provides another layered silicate particle, which is prepared from layered silicate, dibutyltin dilaurate and 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane.

[0018] Furthermore, the reaction of dibutyltin dilaurate and 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane is carried out in the presence of a catalyst, and the catalyst is p-toluenesulfonic acid.

[0019] Furthermore, the molar ratio of the dibutyltin dilaurate to 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and the catalyst is 1:1:(0.05-0.2).

[0020] Furthermore, the mass ratio of the layered silicate to dibutyltin dilaurate is 1:(0.2-1).

[0021] In the present invention, under the catalytic effect of p-toluenesulfonic acid, dibutyltin dilaurate and 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane undergo an ester exchange reaction, and organic tin siloxane is in situ generated in the layered structure of silicate, thereby achieving organic modification of layered silicate, and the purpose is to improve the addition effect of layered silicate in lubricating oil.

[0022] The layered silicate particles prepared from layered silicate, dibutyltin dilaurate, and 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane are also subjected to crushing and grinding steps to control the particle size within the range specified for lubricating oil.

[0023] The preparation method of the layered silicate particles comprises the following steps: drying, crushing and grinding the layered silicate, mixing it with dibutyltin dilaurate, 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and p-toluenesulfonic acid, heating it to 70-75° C., stirring it under reflux, stopping heating after the viscosity of the system becomes stable, cooling it to room temperature, crushing it and grinding it to obtain the layered silicate particles.

[0024] The beneficial effects of the present invention are as follows: the present invention uses layered silicate particles as the main component of the additive, and the layered silicate is widely available and easy to obtain, which can greatly reduce the preparation cost of the additive; adding an appropriate amount of the obtained additive to the lubricating oil of the wind turbine gearbox can not only give the lubricating oil the ability to self-repair wear, but also improve the lubricating performance of the lubricating oil, reduce the friction of the gear and bearing surfaces, instantly repair the wear of the gear and bearing surfaces, delay the wear rate of the gear and bearing, and extend the service life of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Comparison photos of the fan main shaft bearing before and after repair. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and diagrams.

[0027] Example 1

[0028] The montmorillonite was dried at 110° C. under normal pressure to constant weight, crushed, ground in a ball mill, and passed through a 100-mesh sieve to obtain layered silicate particles.

[0029] Example 2

[0030] The kaolin was dried at 110° C. under normal pressure to constant weight, crushed, ground in a ball mill, and passed through a 100-mesh sieve to obtain layered silicate particles.

[0031] Example 3

[0032] The talc was dried at 110° C. under normal pressure to constant weight, crushed, ground in a ball mill, and passed through a 100-mesh sieve to obtain layered silicate particles.

[0033] Example 4

[0034] The montmorillonite and mica were dried at 110° C. under normal pressure to constant weight, crushed, mixed in a mass ratio of 1:1, ground in a ball mill, and passed through a 100-mesh sieve to obtain layered silicate particles.

[0035] Example 5

[0036] The montmorillonite is dried at 110°C under normal pressure to constant weight, crushed, ground in a ball mill, passed through a 100-mesh sieve, and then mixed with dibutyltin dilaurate, 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and p-toluenesulfonic acid, heated to 70-75°C, stirred under reflux, and stopped heating after the viscosity of the system is stable, cooled to room temperature, crushed, ground in a ball mill, passed through a 100-mesh sieve, and layered silicate particles are obtained. The molar ratio of dibutyltin dilaurate to 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and p-toluenesulfonic acid is 1:1:0.05; the mass ratio of layered silicate to dibutyltin dilaurate is 1:0.2, based on the mass of the layered silicate after drying, crushing, grinding and sieving.

[0037] Example 6

[0038] The montmorillonite is dried at 110°C under normal pressure to constant weight, crushed, ground in a ball mill, sieved through a 100-mesh sieve, and then mixed with dibutyltin dilaurate, 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and p-toluenesulfonic acid, heated to 70-75°C, stirred under reflux, and stopped heating after the viscosity of the system is stable, cooled to room temperature, crushed, ground in a ball mill, sieved through a 100-mesh sieve, and layered silicate particles are obtained. The molar ratio of dibutyltin dilaurate to 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and p-toluenesulfonic acid is 1:1:0.1; the mass ratio of layered silicate to dibutyltin dilaurate is 1:0.5, based on the mass of the layered silicate after drying, crushing, grinding and sieving.

[0039] Example 7

[0040] The montmorillonite is dried at 110°C under normal pressure to constant weight, crushed, ground in a ball mill, sieved through a 100-mesh sieve, and then mixed with dibutyltin dilaurate, 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and p-toluenesulfonic acid, heated to 70-75°C, stirred under reflux, and stopped heating after the viscosity of the system is stable, cooled to room temperature, crushed, ground in a ball mill, sieved through a 100-mesh sieve, and layered silicate particles are obtained. The molar ratio of dibutyltin dilaurate to 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and p-toluenesulfonic acid is 1:1:0.2; the mass ratio of layered silicate to dibutyltin dilaurate is 1:1, based on the mass of the layered silicate after drying, crushing, grinding and sieving.

[0041] Example 8

[0042] The kaolin is dried at 110°C under normal pressure to constant weight, crushed, ground in a ball mill, passed through a 100-mesh sieve, and then mixed with dibutyltin dilaurate, 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and p-toluenesulfonic acid, heated to 70-75°C, stirred under reflux, and stopped heating after the viscosity of the system is stable, cooled to room temperature, crushed, ground in a ball mill, passed through a 100-mesh sieve, and layered silicate particles are obtained. The molar ratio of dibutyltin dilaurate to 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane and p-toluenesulfonic acid is 1:1:0.1; the mass ratio of layered silicate to dibutyltin dilaurate is 1:0.5, based on the mass of the layered silicate after drying, crushing, grinding and sieving.

[0043] The layered silicate particles prepared in Examples 1 to 8 were mixed with 2,6-di-tert-butyl-p-cresol and isobutylene sulfide and then added to SpectraSyn Elite TM The mPAO base oil was fully mixed to obtain lubricating oil (corresponding to samples 1 to 8). The addition ratio of layered silicate particles was 1wt%, the addition ratio of 2,6-di-tert-butyl-p-cresol was 0.5wt%, and the addition ratio of isobutylene sulfide was 0.5wt%. The blank control was to add only 2,6-di-tert-butyl-p-cresol and isobutylene sulfide without adding layered silicate particles.

[0044] The wear spot diameter was measured according to SH / T 0189-1992 "Determination of Anti-wear Performance of Lubricating Oil (Four-ball Machine Method)"; the test conditions were: 75°C, 1200 r / min, 40 kgf, 60 min. The measurement results are shown in Table 1.

[0045] Table 1 Test results of anti-wear properties of lubricating oil

[0046]

[0047]

[0048] Comparative analysis of the data in Table 1 shows that the layered silicate particles prepared in the examples can improve the anti-wear performance of lubricating oil.

[0049] Figure 1 Comparison photos of the fan main shaft bearing before and after repair. Figure 1 It can be seen that there is obvious pitting and spalling on the spindle bearing, and the damaged area begins to expand. After 2 months of repair with sample 5, it can be clearly seen that the damage is frozen and no longer expands. At the same time, the place where the damage just started to appear on the surface is repaired, and the original pitting and spalling are weakened.

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A self-repairing lubricating additive for a wind turbine gearbox, characterized in that: Includes layered silicate particles.

2. The wind turbine gearbox self-repairing lubricating additive according to claim 1, characterized in that: The layered silicate particles are obtained by drying, crushing and grinding layered silicate.

3. The wind turbine gearbox self-repairing lubricating additive according to claim 2, characterized in that: The layered silicate is one or more of montmorillonite, bentonite, kaolin, talc, zeolite, vermiculite and mica.

4. The wind turbine gearbox self-repairing lubricating additive according to claim 2, characterized in that: The drying is normal pressure drying or vacuum drying.

5. The wind turbine gearbox self-repairing lubricating additive according to claim 2, characterized in that: The grinding is carried out in a ball mill.

6. The wind turbine gearbox self-repairing lubricating additive according to claim 1, characterized in that: The self-repairing lubricant additive also includes an antioxidant.

7. The wind turbine gearbox self-repairing lubricating additive according to claim 6, characterized in that: The antioxidant is one or more of phenolic antioxidants and amine antioxidants.

8. The wind turbine gearbox self-repairing lubricating additive according to claim 1, characterized in that: The self-repairing lubricating additive also includes an extreme pressure anti-wear agent.

9. The wind turbine gearbox self-repairing lubricating additive according to claim 8, characterized in that: The extreme pressure anti-wear agent is one or more of organic chlorides, organic sulfides, organic phosphides, organic metal salts and borates.

10. The wind turbine gearbox self-repairing lubricating additive according to any one of claims 1 to 9, characterized in that: The self-repairing lubricating additive is added to the lubricating oil in a proportion of 0.5 to 5 wt %.

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