Energy-saving industrial gear lubricating oil composition and preparation method thereof

Abstract

The invention relates to the technical field of lubricating oil, in particular to an energy-saving type lubricating oil composition for industrial gears and a preparation method of the energy-saving type lubricating oil composition. The lubricating oil composition is prepared from an extreme pressure anti-wear agent, a friction modifier, an anti-corrosion and anti-rust agent, an antioxidant, a demulsifier, an anti-foaming agent, a viscosity index improver and base oil, the extreme pressure anti-wear agent is prepared from more than one of zinc butyl thiocarbamate boride, calcium pentadecyl borate, calcium pentadecyl thioborate, thiophosphoric triester and butyl triphenyl thiophosphate; the friction modifier comprises more than one of molybdenum alkyl thiophosphate, molybdenum amine ester, a molybdenum carbamate complex, nitrogen-containing boric acid ester, phosphate and benzotriazole fatty amine salt. The energy-saving lubricating oil composition for the industrial gear has outstanding oil film thickness, extremely low friction coefficient and excellent defoaming capability, can help an industrial gear system to save energy consumption during working, and effectively improves the efficiency of a transmission system.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating oils, and in particular to an energy-saving lubricating oil composition for industrial gears and a preparation method thereof. Background Art

[0002] In industry, mechanical wear is one of the three major causes of material failure. One-third of energy is consumed in overcoming friction, and about 80% of parts are scrapped due to wear. Lubricants are used to overcome these friction and wear losses. If fluid lubrication requires the selection of low-viscosity lubricants, if boundary lubrication or mixed lubrication, oiliness agents, friction modifiers, or extreme pressure anti-wear agents should be added to the lubricants.

[0003] Generally speaking, friction modifiers contain polar groups. This is because substances containing polar groups have a strong affinity for metal surfaces. They are strongly adsorbed on the metal surface through polar groups, forming a protective film similar to a cushion to separate the metals and prevent direct contact between the metals, thereby reducing friction and wear. Extreme pressure anti-wear agents are commonly used additives in industrial gear lubricants. They can prevent sintering, abrasion and wear on the sliding metal surface under extreme pressure conditions, thereby extending the service life of the gears. However, in lubricating oils, when friction modifiers and extreme pressure anti-wear agents are used at the same time, there may be a synergistic effect or an antagonistic effect between the two additives. The main reason is that the polarity of friction modifiers is usually stronger than that of extreme pressure anti-wear agents, and they have excellent competitive adsorption effects. The molecules of friction modifiers are preferentially adsorbed, and the role of extreme pressure anti-wear agents is not easy to play, resulting in a decrease in extreme pressure performance. Therefore, it is extremely difficult to use friction modifiers and extreme pressure anti-wear agents together to improve lubricating oils.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The present invention provides an energy-saving lubricating oil composition for industrial gears and a preparation method thereof. By screening the types of additives, especially the lubricating oil made of specific friction modifiers and extreme pressure anti-wear agents, the gear transmission device can be in a mixed lubrication state with both elastic fluid lubrication and boundary lubrication, reducing the friction between contact surfaces, improving the protection performance of tooth surfaces and bearings, thereby reducing friction and wear and energy consumption. This mixed lubrication state has a good energy-saving effect. In particular, the lubricating oil prepared by the present invention has an outstanding oil film thickness, an extremely low friction coefficient and excellent defoaming ability. While having excellent extreme pressure ability, the extremely low friction coefficient can effectively reduce the friction resistance between parts, thereby reducing wear, extending the service life of the gear box, improving transmission efficiency and reducing equipment energy consumption.

[0006] Specifically, the present invention provides an energy-saving lubricating oil composition for industrial gears, which is composed of the following components in percentage by weight:

[0007] The extreme pressure anti-wear agent is 0.1% to 5%;

[0008] Friction modifier is 0.01% to 1%;

[0009] The anticorrosion and rust inhibitor is 0.02% to 0.5%;

[0010] Antioxidant: 0.05% to 1.5%;

[0011] Demulsifier is 0.01% to 0.03%;

[0012] Antifoaming agent: 0.001% to 0.05%;

[0013] The viscosity index improver is 0.01% to 7.5%;

[0014] Base oil balance;

[0015] The extreme pressure anti-wear agent includes one or more of boronated butylthiocarbamate zinc, pentadecyl calcium borate, pentadecyl calcium thioborate, thiophosphate triester and butyl triphenyl thiophosphate;

[0016] The friction modifier includes at least one of alkyl molybdenum thiophosphate, molybdenum amine ester, molybdenum carbamate complex, nitrogen-containing borate ester, phosphoric acid ester and benzotriazole fatty amine salt.

[0017] The present invention has been discovered through extensive research and development that when the above-mentioned extreme pressure anti-wear agent and friction modifier are used together, the prepared lubricating oil composition has an outstanding oil film thickness, can provide better extreme pressure anti-wear ability for the gear system, protect the tooth surface and extend the service life of the gear, and greatly reduce the friction coefficient of the gear surface, thereby achieving the effect of reducing wear, improving transmission efficiency and reducing energy consumption.

[0018] According to the energy-saving lubricating oil composition for industrial gears provided by the present invention, the extreme pressure anti-wear agent is one or more of boronated butylthiocarbamate zinc, pentadecyl calcium borate, pentadecyl calcium thioborate, thiophosphate triester and butyl triphenylthiophosphate;

[0019] And / or, the friction modifier is one or more of phosphate ester, molybdenum amine ester and benzotriazole fatty amine salt.

[0020] Further preferably, when the base oil is an HVI base oil, the extreme pressure anti-wear agent is a sulfur phosphate triester, and the friction modifier is a mixture of a phosphate ester and a molybdenum amine ester.

[0021] According to the energy-saving lubricating oil composition for industrial gears provided by the present invention, the corrosion inhibitor is one or more of dodecenylsuccinic acid half ester, dodecenylsuccinic acid, liquid N-oleyl sarcosine, succinic acid amide derivatives, and thiadiazole and benzotriazole derivatives; preferably, the corrosion inhibitor is one or more of dodecenylsuccinic acid, liquid N-oleyl sarcosine and succinic acid amide derivatives.

[0022] It was found in the experiment that the lubricating oil composition prepared by using the anticorrosion and rust inhibitor has excellent performance in preventing tooth surface corrosion and rust, and can effectively reduce the failure and energy loss of the gear system caused by corrosion and rust.

[0023] According to the energy-saving lubricating oil composition for industrial gears provided by the present invention, the antioxidant is one or more of butyl / octyl diphenylamine, dialkyl dithiocarbamate, high base value sulfurized alkyl phenol calcium and polyisobutylene succinimide; preferably, the antioxidant is one or more of butyl / octyl diphenylamine, high base value sulfurized alkyl phenol calcium and polyisobutylene succinimide.

[0024] The lubricating oil composition prepared by using the antioxidant has excellent antioxidant performance, can effectively improve the oxidation stability of the oil product, reduce sludge generation, thereby reducing the viscosity increase of the oil product caused by oxidation and ensuring transmission efficiency.

[0025] According to the energy-saving lubricating oil composition for industrial gears provided by the present invention, the viscosity index improver is one or more of hydrogenated styrene isoprene, random copolymer of ethylene and α-olefin and polymethacrylate; preferably, the viscosity index improver is hydrogenated styrene isoprene or polymethacrylate.

[0026] When the viscosity index improver is used, the prepared lubricating oil composition can maintain the viscosity-temperature performance, extreme pressure anti-wear and friction reduction performance of a relatively low viscosity oil product, thereby achieving energy-saving effects.

[0027] According to the energy-saving lubricating oil composition for industrial gears provided by the present invention, the demulsifier is one or more of polyethoxylated fatty alcohols, fatty alcohol polyoxyethylene ether carboxylic acids and polyisobutylene succinic acid amide.

[0028] According to the energy-saving lubricating oil composition for industrial gears provided by the present invention, the antifoaming agent is one or more of three-dimensional siloxane, polymethyl silicone oil and methyl silicone oil ester. The reason for using the antifoaming agent is that the selected friction modifier contains polar groups with strong adsorption force such as amino and ester groups, which will increase the surface tension of the oil and affect the defoaming performance. Therefore, it is necessary to cooperate with a silicon-type antifoaming agent. The lubricating oil composition using the above antifoaming agent has excellent defoaming ability, which can effectively reduce the poor lubrication effect, accelerated wear, reduced oil pump efficiency, increased energy consumption and increased oil consumption caused by the generation of foam in the gear system.

[0029] According to the energy-saving lubricating oil composition for industrial gears provided by the present invention, the base oil is a mineral or synthetic base oil; preferably, the base oil is one or more of HVI Ia500, HVI 120BS and PAO40, and the content thereof can be 80% to 97.5%.

[0030] According to the energy-saving lubricating oil composition for industrial gears provided by the present invention, the mass percentages of the components are respectively:

[0031] The extreme pressure anti-wear agent is 0.2% to 3%;

[0032] The friction modifier is 0.2% to 1%;

[0033] The anticorrosion and rust inhibitor is 0.02% to 0.5%;

[0034] The antioxidant is 0.05% to 1.5%;

[0035] The demulsifier is 0.01% to 0.03%;

[0036] The antifoaming agent is 0.001% to 0.05%;

[0037] The viscosity index improver is 0.01% to 7.5%;

[0038] Base oil balance;

[0039] Those skilled in the art can combine the above preferred solutions to obtain preferred embodiments of the present invention. Preferably, the mass percentages of the components are:

[0040] The extreme pressure anti-wear agent is 2.5%;

[0041] The friction modifier is 0.5%;

[0042] The anticorrosion and rust inhibitor is 0.2%;

[0043] The antioxidant is 0.5%;

[0044] The demulsifier is 0.02%;

[0045] The antifoaming agent is 0.03%;

[0046] The viscosity index improver is 5%;

[0047] Base oil balance.

[0048] The present invention also provides a method for preparing the lubricating oil composition as described above, comprising: mixing all raw materials except the antifoaming agent according to a proportion, cooling and adding the antifoaming agent, and mixing to obtain the lubricating oil composition.

[0049] The method for preparing the lubricating oil composition provided by the present invention comprises:

[0050] Except for the antifoaming agent, the raw materials are mixed according to the proportion at 50°C to 70°C to obtain a premix;

[0051] After the premix is ​​cooled to 40-50° C., an antifoaming agent is added and mixed to obtain the lubricating oil composition.

[0052] The energy-saving lubricating oil composition for industrial gears of the present invention and its preparation method can provide excellent gear protection for industrial gear systems by screening the types of additives, especially lubricating oil made of specific friction modifiers and extreme pressure anti-wear agents. The components work synergistically; the lubricating oil composition of the present invention has an outstanding oil film thickness, can provide excellent extreme pressure anti-wear properties, protect gears and extend the service life of gears, and also make the obtained lubricating oil composition have an extremely low friction coefficient, thereby achieving the effects of reducing wear, improving transmission efficiency and reducing energy consumption.

[0053] The energy-saving lubricating oil composition for industrial gears of the present invention has excellent additive compatibility through the screening of viscosity index improvers, and can effectively improve the oil film thickness and extreme pressure and anti-wear performance of low-viscosity oils.

[0054] The energy-saving lubricating oil composition for industrial gears of the present invention improves the defoaming ability of the oil product by screening the antifoaming agent, thereby reducing the influence of foam on the performance of the oil product.

[0055] The energy-saving industrial gear lubricant composition of the present invention can be used in all industrial gear systems, especially gear transmission systems in traditional industrial fields such as cement and steel with harsh conditions and heavy loads. It can fully meet the lubrication requirements of various gear boxes working in harsh environments and effectively improve the efficiency of the transmission system. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased through regular channels.

[0058] The present invention tests the energy-saving effect of the energy-saving industrial gear lubricant composition when used in a gear transmission device by using an MTM micro traction tester. The MTM micro traction tester is produced by the British PCS company, and can measure the friction performance of lubricated contact and non-lubricated contact under a wide range of rolling and sliding conditions, that is, the traction coefficient. The two friction pairs in contact with each other on the MTM are each controlled by an independent driving mechanism, and can achieve independent movement. According to the speed of relative movement of the friction pair, the sliding / rolling ratio (SRR) of the MTM can be adjusted between 0% and 100%, the test load can reach 75N, the maximum average speed can reach 4.0m / s, and the temperature can reach 150°C to simulate different friction conditions. The lower the traction coefficient measured at the same SRR, load and temperature, the better the anti-friction performance of the lubricant. Since the energy-saving industrial gear lubricant composition is specifically used in a gear transmission system, the SRR is selected to be 50%, the test load is 75N, the sliding speed is 1.0m / s, and the experimental temperature is 60°C during the test.

[0059] The energy-saving performance of the oil of the present invention is evaluated by GB / T 14231 "Method for Determining the Efficiency of Gear Devices". The transmission efficiency of the gearbox is measured by this method to show the energy-saving performance of the oil. The GB / T 14231 method includes a direct power measurement method and a power loss method. Generally, when the input and output axes of the gear device are located on the same side and parallel and the efficiency is higher than or equal to 98%, the power loss method should be used to determine the transmission efficiency of the gear; when the power loss method cannot be used, if the design efficiency is not higher than 98%, or if high-precision testing equipment is available, the power direct measurement method can also be used to determine the transmission efficiency of the gear. Since the design efficiency of the selected gear device is not higher than 98%, the power direct measurement method is used.

[0060] The direct power measurement method is to install the gear device between two torque and speed sensors, and then collect the relevant data measured by the sensors to calculate the transmission efficiency of the gear. The calculation formula for the gear device efficiency (η) determined by the direct power measurement method is as follows:

[0061]

[0062] Where T0 is the output shaft torque measured by the output end sensor, in N·m; T i is the input shaft torque measured by the input end sensor, in N·m; n0 is the output shaft speed measured by the output end sensor, in r / min; n i It is the input shaft speed measured by the input end sensor, in r / min.

[0063] The oil film thickness of the present invention is tested using an EHD2 oil film thickness tester. Among them, the EHD2 oil film thickness tester is based on the principle of ultra-thin film light interference and can be used to measure the oil film thickness of the lubricating oil during the lubrication process. The test piece is a test steel ball made of AISI 52100 special alloy steel and a glass test disk coated with Cr / SiO2 coating. The surface roughness of the steel ball is 10-12nm, and the roughness of the glass test disk is 10nm. During the test, the test steel ball is supported by a support seat with a ball bearing below, and an upward load is applied to it by a loading mechanism to "press" the glass test disk. The lower half of the test steel ball is immersed in the test oil. During the test, the glass test disk is driven to rotate by a driving motor below the test cavity, driving the test steel ball to do pure rolling. The steel ball brings the test oil into the contact area between it and the glass test disk, and the loading mechanism loads the steel ball to form a lubricating contact. During the oil film test, a beam of complex color light is emitted from the upper light source, passing through the microscope and the glass test disk to illuminate the contact area. It is reflected back from the surface of the test steel ball. One monochromatic light did not pass through the Si coating and the lubricating oil film in the contact area, but passed through the coating and the oil film. Therefore, there is an optical path difference between the two beams. After the spectrometer receives the reflected light, the software calculates the oil film thickness based on the optical path difference. During the test, the rolling speed of the steel ball is fixed at 2m·s -1 , the load is 50N, the Hertz contact pressure is 0.5GPa, and the test temperature is 40℃.

[0064] The viscosity grade of the compounding in the present invention ranges from ISO VG 150 to 680.

[0065] Embodiments 1 to 4

[0066] A method for preparing an energy-saving lubricating oil composition for industrial gears, the steps of which are as follows:

[0067] Raw material preparation: Each component is prepared according to the mass fraction in Table 1.

[0068] (1) Stir all components except the antifoaming agent at 50°C to 70°C for 3 hours;

[0069] (2) Lower the temperature to about 45°C, add antifoaming agent, and continue stirring for 2 hours.

[0070] The prepared lubricating oil composition was tested, and various typical physical and chemical indicators are shown in Table 2.

[0071] Table 1

[0072]

[0073]

[0074] Table 2

[0075]

[0076] Comparative Examples 1 to 4

[0077] A lubricating oil composition, the preparation method of which is basically the same as that of Example 1, except that the ratio of each component in Example 1 is replaced by the ratio shown in Table 3 below, and the test results of the prepared lubricating oil composition are shown in Table 4.

[0078] Table 3

[0079]

[0080] Table 4

[0081]

[0082]

[0083] It can be seen from the above test results that if the raw materials are not properly selected, for example, when the extreme pressure anti-wear agent used in combination with the friction modifier is other commonly used substances, even if the dosage is adjusted to obtain the best performance of the lubricating oil, that is, the extreme pressure and anti-wear performance of the oil product meets the technical index requirements of GB5903 L-CKC or L-CKD, there is still a problem of large differences in oil film thickness and transmission efficiency compared with the lubricating oil composition in Examples 1 to 4, and there is no energy-saving effect, and the anti-corrosion, anti-rust and antioxidant properties of the lubricating oil composition are also adversely affected.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-saving lubricating oil composition for industrial gears, characterized in that: It is composed of the following components in percentage by mass: The extreme pressure anti-wear agent is 0.1% to 5%; Friction modifier is 0.01% to 1%; The anticorrosion and rust inhibitor is 0.02% to 0.5%; Antioxidant: 0.05% to 1.5%; Demulsifier is 0.01% to 0.03%; Antifoaming agent: 0.001% to 0.05%; The viscosity index improver is 0.01% to 7.5%; Base oil balance; The extreme pressure anti-wear agent includes one or more of boronated butylthiocarbamate zinc, pentadecyl calcium borate, pentadecyl calcium thioborate, thiophosphate triester and butyl triphenyl thiophosphate; The friction modifier includes at least one of alkyl molybdenum thiophosphate, molybdenum amine ester, molybdenum carbamate complex, nitrogen-containing borate ester, phosphoric acid ester and benzotriazole fatty amine salt.

2. The energy-saving lubricating oil composition for industrial gears according to claim 1, characterized in that: The extreme pressure anti-wear agent is one or more of boronated butylthiocarbamate zinc, pentadecyl calcium borate, pentadecyl calcium thioborate, thiophosphate triester and butyl triphenyl thiophosphate; And / or, the friction modifier is one or more of phosphate ester, molybdenum amine ester and benzotriazole fatty amine salt.

3. The energy-saving lubricating oil composition for industrial gears according to claim 1 or 2, characterized in that: The anti-corrosion agent is one or more of dodecenylsuccinic acid half ester, dodecenylsuccinic acid, liquid N-oleyl sarcosine, succinic acid amide derivatives, and thiadiazole and benzotriazole derivatives; preferably, the anti-corrosion agent is one or more of dodecenylsuccinic acid, liquid N-oleyl sarcosine and succinic acid amide derivatives.

4. The energy-saving lubricating oil composition for industrial gears according to any one of claims 1 to 3, characterized in that: The antioxidant is one or more of butyl / octyl diphenylamine, dialkyl dithiocarbamate, high base value sulfurized alkyl phenol calcium and polyisobutylene succinimide; preferably, the antioxidant is one or more of butyl / octyl diphenylamine, high base value sulfurized alkyl phenol calcium and polyisobutylene succinimide.

5. The energy-saving lubricating oil composition for industrial gears according to any one of claims 1 to 4, characterized in that: The viscosity index improver is one or more of hydrogenated styrene isoprene, random copolymer of ethylene and α-olefin, and polymethacrylate; preferably, the viscosity index improver is hydrogenated styrene isoprene or polymethacrylate.

6. The energy-saving lubricating oil composition for industrial gears according to any one of claims 1 to 5, characterized in that: The demulsifier is one or more of polyethoxylated fatty alcohol, fatty alcohol polyoxyethylene ether carboxylic acid and polyisobutylene succinic acid amide.

7. The energy-saving lubricating oil composition for industrial gears according to any one of claims 1 to 6, characterized in that: The anti-foaming agent is one or more of three-dimensional siloxane, polymethyl silicone oil and methyl silicone ester.

8. The energy-saving lubricating oil composition for industrial gears according to any one of claims 1 to 7, characterized in that: The base oil is a mineral or synthetic base oil; preferably, the base oil is one or more of HVIIa500, HVI 120BS and PAO40.

9. The energy-saving lubricating oil composition for industrial gears according to any one of claims 1 to 8, characterized in that: The mass percentage of each component is: The extreme pressure anti-wear agent is 0.2% to 3%; The friction modifier is 0.2% to 1%; The anticorrosion and rust inhibitor is 0.02% to 0.5%; The antioxidant is 0.05% to 1.5%; The demulsifier is 0.01% to 0.03%; The antifoaming agent is 0.001% to 0.05%; The viscosity index improver is 0.01% to 7.5%; Base oil balance.

10. The method for preparing the energy-saving lubricating oil composition for industrial gears according to any one of claims 1 to 9, characterized in that: include: Except for the antifoaming agent, the raw materials are mixed according to the proportion, and then the antifoaming agent is added after cooling, and the lubricating oil composition is obtained by mixing.

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