Grease for slewing bearing of solar tracker, its raw material composition and preparation method

Abstract

This invention relates to the field of lubricating oils, and discloses a grease for the slewing bearing of a solar tracker, its raw material composition, and its preparation method. The raw material composition of the grease for the slewing bearing of the solar tracker of this invention, by weight, contains: 1) 7-15 parts of a urea-based thickener; 2) 85-93 parts of a base oil; 3) 0.3-0.5 parts of an amine-type antioxidant; 4) 0.3-0.5 parts of a corrosion inhibitor; 5) 1-6 parts of an extreme pressure agent; and 6) 1-3 parts of a rust inhibitor. The grease of this invention, used for lubricating the slewing bearing of a solar tracker, exhibits excellent low-temperature start-up performance, rust prevention, leak prevention, and backflow resistance. The grease of this invention also has a long service life and a wide applicable temperature range.

Description

Technical Field

[0001] This invention relates to the field of lubricating oils, and more specifically to a grease for the slewing bearing of a solar tracker, its raw material composition, and its preparation method. Background Technology

[0002] With economic development and social progress, people are placing increasingly higher demands on the cleanliness of energy. Solar energy is a truly inexhaustible energy source, and solar power generation does not produce pollution. Therefore, solar power generation is hailed as an "ideal energy source".

[0003] Solar power generation converts solar energy into electrical energy using the photoelectric effect. A solar tracking controller is a power device that keeps solar panels facing the sun at all times, ensuring that sunlight always hits them perpendicularly. The slewing bearing of a dual-axis solar tracking system, as a core component of the tracker, plays a crucial role in the power generation efficiency of solar photovoltaic modules due to its lubrication performance. Common slewing bearing greases suffer from drawbacks such as poor low-temperature start-up performance, poor rust prevention, poor leakage prevention, poor backflow properties, and short lifespan. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of poor low-temperature start-up performance, poor rust prevention, poor leakage prevention, poor backflow performance, and short service life of existing greases for slewing bearings. This invention provides a grease for slewing bearings of solar trackers, its raw material composition, preparation method, and application. This grease has excellent low-temperature start-up performance, rust prevention, leakage prevention, and backflow performance. The grease of this invention has a long service life and a wide applicable temperature range, including -40℃ to 150℃.

[0005] To achieve the above objectives, the present invention provides a grease composition for a slewing bearing of a solar tracker, the composition comprising, by weight:

[0006] 1) 7-15 parts of urea-based thickener;

[0007] 2) 85-93 parts base oil;

[0008] 3) 0.3 to 0.5 parts selected from amine-type antioxidants;

[0009] 4) 0.3-0.5% preservative;

[0010] 5) 1 to 6 parts of extreme pressure agent;

[0011] 6) 1 to 3 parts of rust inhibitor.

[0012] A second aspect of the present invention provides a grease for a slewing bearing of a solar tracker, the grease being processed from a grease raw material composition comprising the grease described in the present invention;

[0013] A third aspect of the present invention provides a method for preparing the lubricating grease described herein, the method comprising:

[0014] (1) A base grease is prepared by reacting the base oil with the thickener raw material;

[0015] (2) Add the amine antioxidant and the preservative;

[0016] (3) Add the extreme pressure agent and the rust inhibitor.

[0017] Preferably, the conditions for adding antioxidants and corrosion inhibitors include a temperature of 110–120°C; and / or the conditions for adding extreme pressure agents and rust inhibitors include a temperature of 90–100°C.

[0018] The grease of this invention has excellent low-temperature start-up performance, rust prevention, leak prevention, and backflow resistance.

[0019] The grease of this invention has a long service life and is applicable to a wide range of temperatures, including -40℃ to 150℃. Detailed Implementation

[0020] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0021] This invention provides a grease raw material composition for a slewing bearing of a solar tracker, the composition comprising, by weight:

[0022] 1) 7-15 parts of urea-based thickener;

[0023] 2) 85-93 parts base oil;

[0024] 3) 0.3 to 0.5 parts selected from amine-type antioxidants;

[0025] 4) 0.3-0.5% preservative;

[0026] 5) 1 to 6 parts of extreme pressure agent;

[0027] 6) 1 to 3 parts of rust inhibitor.

[0028] In this invention, as long as the purpose of this invention can be achieved, the amine antioxidant can be a conventional choice in the art. According to a preferred embodiment of this invention, the antioxidant is selected from one or more of diphenylamine and N-phenylβ-naphthylamine.

[0029] According to a preferred embodiment of the present invention, the amine-type antioxidant is a mixture of diphenylamine and N-phenylβ-naphthylamine, and the mass ratio of diphenylamine to N-phenylβ-naphthylamine is (0.5-1):1. By adopting the aforementioned preferred embodiment, the antioxidant properties of the grease can be further improved, and the service life of the grease can be extended.

[0030] In this invention, the preservative can be any conventional choice in the art, as long as it achieves the objective of the invention. According to a preferred embodiment of the invention, the preservative is selected from one or more of triazole and benzotriazole derivatives. By employing the aforementioned preferred embodiment, the corrosion resistance can be further improved.

[0031] According to a preferred embodiment of the present invention, the benzotriazole derivative is specifically selected from one or more of T551 and T551B, preferably T551.

[0032] According to a preferred embodiment of the present invention, the corrosion inhibitor is a mixture of benzotriazole and T551, and the mass ratio of benzotriazole to T551 is (0.5-1):1. By adopting the aforementioned preferred embodiment, the corrosion resistance can be further improved.

[0033] In this invention, as long as the objective of this invention can be achieved, the extreme pressure agent can be a conventional choice in the art. According to a preferred embodiment of this invention, the extreme pressure agent is selected from one or more of sulfur-phosphorus zinc salts and triphenyl thiophosphate.

[0034] According to a preferred embodiment of the present invention, the extreme pressure agent, a sulfur-phosphorus type zinc salt, is specifically selected from one or more of T202 and T203, preferably T202; the extreme pressure agent, triphenyl thiophosphate, is specifically selected from T309 or TPPT.

[0035] According to a preferred embodiment of the present invention, the extreme pressure agent is a mixture of a zinc thiophosphate salt and a triphenyl thiophosphate, wherein the mass ratio of the zinc thiophosphate salt to the triphenyl thiophosphate is (0.5-1.0):1. By adopting the aforementioned preferred embodiment, the extreme pressure anti-wear performance can be further improved.

[0036] In this invention, the rust inhibitor can be any conventional choice in the art as long as it can achieve the purpose of this invention. According to a preferred embodiment of this invention, the rust inhibitor is selected from one or more of sulfonates and carboxylic acids.

[0037] According to a preferred embodiment of the present invention, the rust inhibitor is specifically selected from one or more of T705, T701, and T746, preferably a mixture of T746 and T705, and the mass ratio of T746 to T705 is (0.5-1):1. By adopting the aforementioned preferred embodiment, the rust-preventive performance can be further improved.

[0038] The amine-type antioxidant, corrosion inhibitor, extreme pressure agent, and rust inhibitor of this invention, when used together with the urea-based thickener and base oil of this invention, have a synergistic effect, which can improve the oxidation resistance, corrosion resistance, rust prevention and extreme pressure anti-wear properties of the grease, thus giving the grease a longer service life.

[0039] In this invention, the range of base oils that can be selected is relatively wide as long as the objective of this invention can be achieved. According to a preferred embodiment of this invention, the base oil is selected from those with a kinematic viscosity of 100-150 mmHg at 40°C. 2 Polyether oil with a kinematic viscosity of 100-150 mm³ / s at 40°C 2 Synthetic hydrocarbons per second and kinematic viscosity at 40°C from 8 to 10 mm. 2 One or more of the synthetic esters / s.

[0040] In a preferred embodiment of the present invention, the base oil contains synthetic hydrocarbons, polyether oil, and synthetic esters; preferably, the mass ratio of synthetic hydrocarbons, polyether oil, and synthetic esters in the base oil is (1-10):(1-10):1. By adopting the aforementioned preferred embodiment, low-temperature start-up and operation performance, as well as long service life and sealing performance, can be further improved.

[0041] In this invention, the range of urea-based thickeners is relatively wide as long as the objective of this invention can be achieved. According to a preferred embodiment of this invention, the urea-based thickener is selected from one or more of bisurea thickeners and tetraurea thickeners; preferably, the bisurea thickener and tetraurea thickener are each one or more of aliphatic amine type, aromatic amine type and alicyclic amine type.

[0042] According to a preferred embodiment of the present invention, the urea-based thickener is prepared by reacting an amine with an isocyanate.

[0043] In this invention, the types of amines can be selected from a wide range. According to a preferred embodiment of this invention, the amine is selected from one or more of aliphatic amines, alicyclic amines, and aromatic amines, and is preferably one or more of octadecylamine, diamine, and cyclohexylamine.

[0044] According to a preferred embodiment of the present invention, the amine is a mixture of octadecylamine, diamine, and cyclohexylamine, and the mass ratio of octadecylamine, diamine, and cyclohexylamine is (0.5-3.0):(0.2-1.0):1. By employing the aforementioned preferred embodiment, the storage stability of the grease can be improved, thereby improving the grease's reflow performance.

[0045] In this invention, a wide range of isocyanates can be selected. According to a preferred embodiment of the invention, the isocyanate is selected from one or more of TDI and MDI, preferably a mixture of TDI and MDI, with a mass ratio of TDI to MDI of (0.03-0.08):1. By employing the aforementioned preferred embodiment, the mechanical and colloidal stability of the grease can be improved.

[0046] The present invention provides a grease for a slewing bearing of a solar tracker, the grease comprising the raw material composition described in the present invention, preferably, the grease of the present invention is processed from the grease raw material composition described in the present invention.

[0047] The grease of this invention has excellent low-temperature start-up performance, rust prevention, leak prevention, and backflow resistance.

[0048] This invention provides a method for preparing the grease for the slewing bearing of a solar tracker, comprising:

[0049] (1) A base grease is prepared by reacting the base oil with the thickener raw material;

[0050] (2) Add the amine antioxidant and the preservative;

[0051] (3) Add the extreme pressure agent and the rust inhibitor.

[0052] According to a preferred embodiment of the present invention, the conditions for adding antioxidants and preservatives in step (2) include a temperature of 110–120°C. By employing the aforementioned preferred embodiment, the solubility and dispersibility of the additives can be improved, while ensuring minimal loss of the additives.

[0053] According to a preferred embodiment of the present invention, the conditions for adding the extreme pressure agent and rust inhibitor in step (3) include a temperature of 90–100°C. By employing the aforementioned preferred embodiment, the dispersion effect of the additives can be improved while reducing the destructive impact on the colloidal stability of the lubricating grease.

[0054] According to a preferred embodiment of the present invention, after adding the extreme pressure agent and the rust inhibitor in step (3) and mixing them evenly, the mixture is ground 2 to 4 times by a three-roll mill. By adopting the aforementioned preferred embodiment, the appearance uniformity, colloidal stability and mechanical stability can be improved.

[0055] According to a preferred embodiment of the present invention, the preparation method of the base lipid in step (1) includes:

[0056] (a) Mix a portion of the base oil with amine, heat until melted, then add another portion of the base oil and lower the temperature to 40-80°C to obtain material one;

[0057] (b) Mix a portion of the base oil with isocyanate, heat until melted, then add another portion of the base oil and lower the temperature to 40-80°C to obtain material two;

[0058] (c) Add material one to material two for reaction, and stir and heat.

[0059] According to a preferred embodiment of the present invention, the reaction conditions in step (c) include: a reaction temperature of 40-80°C and a reaction time of 1-2 hours.

[0060] According to a preferred embodiment of the present invention, in step (c), after the reaction is completed, the mixture is stirred and heated to 160–180°C, and then held at this temperature for 90–120 minutes. By employing the aforementioned preferred embodiment, the colloidal stability and mechanical stability of the grease can be improved, thereby extending the service life of the grease.

[0061] The grease of this invention has a long service life and is applicable to a wide range of temperatures, including -40℃ to 150℃.

[0062] The present invention will be further described below through specific embodiments. The scope of the present invention is not limited to the scope covered by the embodiments. The specific test methods and raw materials involved are as follows:

[0063] Cone penetration: GB / T269;

[0064] Dropping point: GB / T3498;

[0065] Corrosion: GB / T7326;

[0066] Rust resistance: GB / T5018;

[0067] Leakage resistance (rubber compatibility): SH / T0429;

[0068] Low-temperature start-up performance: SH / T0338;

[0069] Reflux stability (storage stability): GB / T269.

[0070] Base oils (polyether oils, synthetic hydrocarbons, synthetic esters): JM104 (Nanjing Jinling Petrochemical Co., Ltd.), PAO10 (EXXONMOBIL), decyl ester (Sinopec Lubricating Oil Co., Ltd. Synthetic Oils Branch);

[0071] Urea-based thickeners (amines, isocyanates): Octadecylamine (Luzhou Tianhua Co., Ltd.), Dimelamine (Cargill Bio-Industry & Trade Co., Ltd.), Cyclohexylamine (Qingdao Xinhua Xian Chemical Co., Ltd.), MDI (BASF), TDI (Shanghai Maclean Biochemical Technology Co., Ltd.);

[0072] Amine-type antioxidants: diphenylamine (Jiangsu Feiya Chemical Industry Co., Ltd.), T531 (Shanghai Demao Chemical Co., Ltd.);

[0073] Preservatives: T706 (Nanjing Botao Chemical Co., Ltd.), T551 (Nanjing Botao Chemical Co., Ltd.);

[0074] Extreme pressure additives: T202 (Wuxi Southern Petroleum Additives Co., Ltd.), T309 (Wuxi Southern Petroleum Additives Co., Ltd.);

[0075] Rust inhibitors: T705 (Wuxi Southern Petroleum Additives Co., Ltd.), T746 (Jiangsu Jintai Chemical Co., Ltd.).

[0076] Example 1

[0077] By weight, 10 parts of polyether oil (kinematic viscosity of 100 mmHg at 40°C) 2 / s), 69 parts PAO (kinematic viscosity at 40℃ is 150 mm³ / s), 2 / s), 10 parts of decyl resin (kinematic viscosity at 40℃ is 8 mm) 2 Mix thoroughly to obtain 89 parts of base oil.

[0078] A portion of the base oil was mixed with 3.16 parts of octadecylamine and 0.58 parts of diamine, heated until melted, and then a portion of the base oil was added. The temperature was controlled at 60°C, and 1.16 parts of cyclohexylamine were added, and the mixture was stirred until homogeneous to obtain material one. A portion of the base oil was mixed with 2.95 parts of MDI isocyanate, heated until melted, and then a portion of the base oil was added. The temperature was controlled at 60°C, and 0.10 parts of TDI isocyanate were added, and the mixture was stirred until homogeneous to obtain material two. Material one was added to material two for reaction. The reaction temperature was controlled at 60℃, and the reaction was carried out for 1.5 hours. The mixture was then stirred and heated to 170℃, held at that temperature for 100 minutes, and then cooled to 120℃. 0.1 parts diphenylamine, 0.2 parts T531, 0.2 parts T706, and 0.2 parts T551 were added. After the temperature dropped to 100℃, 1 part T202, 2 parts T309, 0.667 parts T705, and 0.333 parts T746 were added. After thorough mixing, the mixture was ground three times using a three-roll mill to obtain the grease for the slewing bearing of the solar tracker. Performance tests were conducted, and the results are shown in Table 1.

[0079] Example 2

[0080] By weight, 37 parts of polyether oil (kinematic viscosity at 40°C 150 mmHg) were added. 2 / s), 38 parts PAO (kinematic viscosity at 40℃ is 100 mm³ / s), 2 / s), 10 parts decyl ester (kinematic viscosity at 40℃ is 10 mm) 2 Mix thoroughly to obtain 85 parts base oil.

[0081] A portion of the base oil was mixed with 2.18 parts of octadecylamine and 0.82 parts of diamine, heated until melted, and then a portion of the base oil was added, maintaining the temperature at 70°C. 2.76 parts of cyclohexylamine were added, and the mixture was thoroughly mixed to obtain material one. A portion of the base oil was mixed with 4.36 parts of MDI isocyanate, heated until melted, and then a portion of the base oil was added, maintaining the temperature at 70°C. 0.25 parts of TDI isocyanate were added, and the mixture was thoroughly mixed to obtain material two. Material one was added to material two for reaction, maintaining the temperature at 70°C. The reaction temperature was 70℃, and the reaction time was 1.5 h. The mixture was then stirred and heated to 170℃, held at that temperature for 100 minutes, and then cooled to 110℃. 0.167 parts of diphenylamine, 0.333 parts of T531, 0.133 parts of T706, and 0.267 parts of T551 were added. After the temperature dropped to 95℃, 2 parts of T202, 4 parts of T309, 1.33 parts of T705, and 0.67 parts of T746 were added. The mixture was thoroughly mixed and then ground four times using a three-roll mill to obtain the grease for the slewing bearing of the solar tracker. Performance tests were conducted, and the results are shown in Table 1.

[0082] Example 3

[0083] By weight, 73 parts of polyether oil (kinematic viscosity at 40°C 130 mmHg) were added. 2 / s), 10 parts PAO (kinematic viscosity at 40℃ is 130 mm³ / s), 2 / s), 10 parts decyl ester (kinematic viscosity at 40℃ is 9 mm) 2 Mix thoroughly ( / s) to obtain 93 parts base oil.

[0084] A portion of the base oil was mixed with 1.96 parts of octadecylamine and 0.36 parts of diamine, heated until melted, and then a portion of the base oil was added. The temperature was controlled at 45°C, and 0.79 parts of cyclohexylamine were added. The mixture was thoroughly mixed to obtain material one. A portion of the base oil was mixed with 1.82 parts of MDI isocyanate, heated until melted, and then a portion of the base oil was added. The temperature was controlled at 45°C, and 0.13 parts of TDI isocyanate were added. Material two was then added to material two for reaction. The reaction temperature was controlled at 60℃, and the reaction was carried out for 2 hours. The mixture was then stirred and heated to 170℃, held at that temperature for 100 minutes, and then cooled to 115℃. 0.133 parts diphenylamine, 0.267 parts T531, 0.15 parts T706, and 0.15 parts T531 were added. When the temperature dropped to 90℃, 1.5 parts T202, 1.5 parts T309, 1 part T705, and 1 part T746 were added. After thorough mixing, the mixture was ground twice using a three-roll mill to obtain the grease for the slewing bearing of the solar tracker. Performance tests were conducted, and the results are shown in Table 1.

[0085] Example 4

[0086] The method of Example 1 was followed, except that the amount of decyl ester added was 0 parts, the amount of polyether added was 20 parts, and the other steps were the same as in Example 1. The results are shown in Table 1.

[0087] Example 5

[0088] The method of Example 1 was followed, except that the amount of decyl ester added was 0 parts and the amount of PAO added was 79 parts, while the other steps were the same as in Example 1. The results are shown in Table 1.

[0089] Example 6

[0090] The method of Example 1 was followed, except that the amount of dimelamine added was 0 parts and the amount of octadecylamine added was 3.47 parts, while the other steps were the same as in Example 1. The results are shown in Table 1.

[0091] Example 7

[0092] The method of Example 1 was followed, except that the amount of dimelamine added was 0 parts and the amount of cyclohexylamine added was 1.27 parts, and the other steps were the same as in Example 1. The results are shown in Table 1.

[0093] Table 1

[0094]

[0095] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A grease raw material composition for a solar tracker rotary bearing, characterized by, The composition is in parts by weight, and is: 1) 7-15 parts of urea-based thickening agent; 2) 85-93 parts of base oil; 3) 0.3-0.5 parts of amine antioxidant; 4) 0.3-0.5 parts of preservative; 5) 1-6 parts of extreme pressure agent; 6) 1-3 parts of anti-rust agent; said base oil is a polyether oil having a kinematic viscosity at 40°C of 100 to 150 mm 2 / s, a synthetic hydrocarbon having a kinematic viscosity at 40°C of 8 to 10 mm 2 / s, and a synthetic ester having a kinematic viscosity at 40°C of 8 to 10 mm 2 / s. The mass ratio of the synthetic hydrocarbon, polyether oil and synthetic ester in the base oil is (1-10):(1-10):1; The urea-based thickening agent is prepared by reacting amine with isocyanate; The amine is a mixture of octadecylamine, dimer amine and cyclohexylamine, and the mass ratio of octadecylamine, dimer amine and cyclohexylamine is (0.5-3.0):(0.2-1.0):

1.

2. The composition of claim 1, wherein, The amine antioxidant is selected from one or more of diphenylamine and N-phenyl-β-naphthylamine.

3. The composition of claim 1, wherein, The preservative is selected from one or more of benzotriazole derivatives and triazoles.

4. The composition of claim 1, wherein, The extreme pressure agent is selected from at least one of sulfur-phosphorus type zinc salt and triphenyl phosphite.

5. The composition of claim 1, wherein, The anti-rust agent is selected from at least one of sulfonate and carboxylic acid.

6. A grease for a solar tracker rotary bearing, characterized by, The grease is processed from a grease raw material composition according to any one of claims 1-5.

7. The method of preparing the grease of claim 6, characterized in that, The method comprises: (1) preparing base grease by reacting the base oil with amine and isocyanate; (2) adding the amine antioxidant and the preservative; (3) adding the extreme pressure agent and the anti-rust agent; The conditions for adding the antioxidant and the preservative include a temperature of 110-120°C; The conditions for adding the extreme pressure agent and the anti-rust agent include a temperature of 90-100°C.

8. The preparation method according to claim 7, wherein, The preparation method of the base grease in step (1) comprises: (a) mixing part of the mass of base oil with amine, heating to melt, then adding part of the mass of base oil to reduce the temperature to 40-80°C to obtain material one; (b) mixing part of the mass of base oil with isocyanate, heating to melt, then adding part of the mass of base oil to reduce the temperature to 40-80°C to obtain material two; (c) adding the material one to the material two for reaction and stirring to increase the temperature.

9. The preparation method according to claim 8, wherein, The reaction conditions in step (c) include a reaction temperature of 40-80°C and a reaction time of 1-2h.

10. The preparation method according to claim 9, wherein, After the reaction in step (c) is completed, the temperature is increased to 160-180°C by stirring, and then kept constant for 90-120 minutes.

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