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

Abstract

The present application relates to the technical field of lubricating oil, in particular to an energy-saving industrial gear lubricating oil composition and a preparation method thereof. The lubricating oil composition is composed of extreme pressure anti-wear agent, friction modifier, corrosion and rust inhibitor, antioxidant, demulsifier, antifoam agent, viscosity index improver and base oil. The extreme pressure anti-wear agent includes one or more of boronized butyl zinc thiocarbamate, calcium pentadecyl borate, calcium pentadecyl thio borate, sulfur phosphorus triester and butyl triphenyl phosphorothioate. The friction modifier includes one or more of alkyl molybdenum thiophosphate, molybdenum amine ester, molybdenum carbamate complex, nitrogen-containing borate, phosphate ester and benzene triazole fatty amine salt. The energy-saving industrial gear lubricating oil composition has outstanding oil film thickness, extremely low friction coefficient and excellent defoaming capacity, which can help industrial gear systems save energy consumption during work and effectively improve the efficiency of the transmission system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lubricating oil, in particular to an energy-saving industrial gear lubricating oil composition and a preparation method thereof. BACKGROUND

[0002] In industry, mechanical wear is one of the three major causes of material failure, one third of energy is consumed to overcome friction, and about 80% of parts are scrapped due to wear. Lubricating oil is used to overcome these friction and wear losses. If fluid lubrication is required, a lubricating oil with low viscosity should be selected, and if boundary lubrication or mixed lubrication is required, an oiliness agent or a friction modifier or an extreme pressure anti-wear agent should be added to the lubricating oil.

[0003] Generally, friction modifiers contain polar groups, because substances containing polar groups have strong affinity for metal surfaces, strongly adsorb on metal surfaces through polar groups, form a protective film similar to a buffer pad to separate the metal, prevent direct contact between the metal, and thus reduce friction and wear. The extreme pressure anti-wear agent is a commonly used additive in industrial gear lubricating oil, which can prevent the sintering, scratching and wear of the sliding metal surface under extreme pressure conditions, and prolong the service life of the gear. However, when the friction modifier and the extreme pressure anti-wear agent are used together in the lubricating oil, there may be synergistic effect or antagonistic effect between the two additives, mainly because the polarity of the friction modifier is usually stronger than that of the extreme pressure anti-wear agent, and the friction modifier has superior competitive adsorption effect, so the friction modifier is preferentially adsorbed, and the effect of the extreme pressure anti-wear agent is not easy to play, thereby causing the extreme pressure performance to decrease. Therefore, it is extremely difficult to combine the friction modifier and the extreme pressure anti-wear agent to improve the lubricating oil.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The present application provides an energy-saving industrial gear lubricating oil composition and a preparation method thereof. By screening the types of additives, especially the lubricating oil made of specific friction modifier and extreme pressure anti-wear agent, the gear transmission device can be in a mixed lubrication state of both elastic fluid lubrication and boundary lubrication, the friction between the contact surfaces can be reduced, the gear surface and bearing protection performance can be improved, thereby reducing friction and wear and energy consumption. This mixed lubrication state has good energy-saving effect. In particular, the lubricating oil prepared by the present application has outstanding oil film thickness, extremely low friction coefficient and excellent defoaming capacity, while having excellent extreme pressure capacity, the extremely low friction coefficient can effectively reduce the friction resistance between parts, achieve the effects of reducing wear, prolonging the service life of the gear box, improving the transmission efficiency and reducing the energy consumption of the equipment.

[0006] Specifically, the present application provides an energy-saving industrial gear lubricating oil composition, which is composed of the following components with mass percentage:

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

[0008] friction modifier 0.01-1%;

[0009] corrosion and rust inhibitor 0.02-0.5%;

[0010] antioxidant 0.05-1.5%;

[0011] demulsifier 0.01-0.03%;

[0012] anti-foaming agent 0.001-0.05%;

[0013] viscosity index improver 0.01-7.5%;

[0014] balance of base oil;

[0015] the extreme pressure anti-wear agent includes one or more of borated butyl zinc thiocarbamate, calcium pentadecyl borate, calcium pentadecyl thioborate, sulfur phosphorus triester, and butyl triphenyl phosphorothioate;

[0016] the friction modifier includes one or more of molybdenum alkyl thiophosphate, molybdenum amine ester, molybdenum carbamate complex, nitrogen-containing borate ester, phosphate ester, and benzotriazole fatty amine salt.

[0017] The present application adopts the discovery through a large number of 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 outstanding oil film thickness, can provide better extreme pressure anti-wear capacity for the gear system, protect the gear surface and prolong the service life of the gear, and greatly reduce the friction coefficient of the gear surface, achieve the effect of reducing wear, improving transmission efficiency, and reducing energy consumption.

[0018] The energy-saving type industrial gear lubricating oil composition provided by the present application, the extreme pressure anti-wear agent is one or more of borated butyl zinc thiocarbamate, calcium pentadecyl borate, calcium pentadecyl thioborate, sulfur phosphorus triester, and butyl triphenyl phosphorothioate;

[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 HVI base oil, the extreme pressure anti-wear agent is sulfur phosphorus triester, and the friction modifier is a mixture of phosphate ester and molybdenum amine ester.

[0021] The energy-saving industrial gear lubricating oil composition provided by the present application, the anticorrosive agent is one or more of dodecenyl succinic acid half ester, dodecenyl succinic acid, liquid N-oleic acid sarcosine, succinic acid amide derivative and thiadiazole and benzene triazole derivative; preferably, the anticorrosive agent is one or more of dodecenyl succinic acid, liquid N-oleic acid sarcosine and succinic acid amide derivative.

[0022] It is found in the test that the lubricating oil composition prepared by using the anticorrosive agent has excellent anticorrosion performance, which can effectively reduce the failure and energy loss of the gear system caused by corrosion and rust.

[0023] The energy-saving industrial gear lubricating oil composition provided by the present application, the antioxidant is one or more of butyl / octyl diphenylamine, dialkyl dithiocarbamate, high alkaline value sulfuration alkyl phenol calcium and polyisobutylene succinimide; preferably, the antioxidant is one or more of butyl / octyl diphenylamine, high alkaline value sulfuration alkyl phenol calcium and polyisobutylene succinimide.

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

[0025] The energy-saving industrial gear lubricating oil composition provided by the present application, the viscosity index improver is one or more of hydrogenated styrene isoprene, random copolymer of ethylene and a-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 and wear resistance and wear reduction performance of the low viscosity oil product, thereby achieving the energy-saving effect.

[0027] The energy-saving industrial gear lubricating oil composition provided by the present application, the demulsifier is one or more of polyethoxylated fatty alcohol, fatty alcohol polyoxyethylene ether carboxylic acid and polyisobutylene succinamide.

[0028] The energy-saving industrial gear lubricating oil composition provided by the present application, the antifoaming agent is one or more of three-dimensional siloxane, polymethylsilicone oil and methyl silicone oil ester. The reason for using the antifoaming agent is that the selected friction improver contains amino group, ester group and other strong adsorption polar groups, which can increase the surface tension of the oil product and affect the defoaming performance. Therefore, the silicon type antifoaming agent is needed. The lubricating oil composition prepared by using the above antifoaming agent has excellent defoaming capacity, which can effectively reduce the poor lubrication effect, accelerated wear, decreased oil pump efficiency, increased energy consumption and increased oil consumption caused by the foam in the gear system.

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

[0030] According to the energy-saving industrial gear lubricating oil composition provided by the present application, the mass percentage of each component is respectively:

[0031] The extreme pressure and wear resistance agent is 0.2% to 3%;

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

[0033] The corrosion 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] The base oil is the rest;

[0039] The person skilled in the art can combine the above preferred schemes to obtain the preferred embodiments of the present application. Preferably, the mass percentage of each component is respectively:

[0040] The extreme pressure and wear resistance agent is 2.5%;

[0041] The friction modifier is 0.5%;

[0042] The corrosion 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] The base oil is the rest.

[0048] The present application also provides a preparation method of the lubricating oil composition as described above, which comprises: mixing each raw material according to the ratio, then adding the antifoaming agent after cooling, and mixing to obtain the lubricating oil composition.

[0049] The preparation method of the lubricating oil composition provided by the application comprises the following steps:

[0050] In addition to the anti-foaming agent, the raw materials are mixed in a proportion at 50-70 DEG C to obtain a premix;

[0051] After the premix is cooled to 40-50 DEG C, the anti-foaming agent is added and mixed to obtain the lubricating oil composition.

[0052] The energy-saving industrial gear lubricating oil composition and the preparation method thereof have the advantages that by screening the types of additives, especially the lubricating oil made of specific friction modifiers and extreme pressure anti-wear agents, the components synergistically work to provide excellent gear protection for the industrial gear system; the lubricating oil composition has outstanding oil film thickness, can provide excellent extreme pressure and anti-wear performance, protects the gear and prolongs the service life of the gear, and also makes the obtained lubricating oil composition have a very low friction coefficient, so that the effects of reducing wear, improving transmission efficiency and reducing energy consumption are achieved.

[0053] The energy-saving industrial gear lubricating oil composition has excellent additive compatibility, can effectively improve the oil film thickness and extreme pressure and anti-wear performance of low-viscosity oil products, by screening the viscosity index improvers.

[0054] The energy-saving industrial gear lubricating oil composition improves the defoaming capacity of the oil product and reduces the influence of foam on the performance of the oil product, by screening the anti-foaming agents.

[0055] The energy-saving industrial gear lubricating oil composition can be used in all industrial gear systems, especially the gear transmission systems in traditional industrial fields such as cement and steel, can completely meet the lubrication requirements of various gearboxes working in harsh environments, and effectively improves the efficiency of the transmission system. DETAILED DESCRIPTION

[0056] To make the purpose, technical solutions and advantages of the application clearer, the technical solutions in the application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0057] If the specific technology or condition is not specified in the embodiments, the technology or condition described in the literature in the art or according to the product manual is used. If the reagent or instrument is not specified by the manufacturer, it is a conventional product that can be purchased through a regular channel.

[0058] The present application tests the energy-saving effect of the energy-saving industrial gear lubricating oil composition when used in a gear transmission device by means of a MTM micro traction force tester. The MTM micro traction force tester is produced by the British PCS Company, which can measure the friction performance of lubricated contact and non-lubricated contact, i.e. the traction coefficient, under a wide range of rolling and sliding conditions. The two friction pairs in contact with each other on the MTM have independent driving mechanisms for control, and independent movement can be achieved. According to the speed of the relative movement of the friction pairs, 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℃, so as to simulate different friction conditions. The lower the traction coefficient measured under the same SRR, load and temperature, the better the anti-friction performance of the lubricating oil. Since the energy-saving industrial gear lubricating oil composition is specially used in the gear transmission system, the SRR is selected as 50%, the test load is 75N, the sliding speed is 1.0m / s, and the experimental temperature is 60℃ during the test.

[0059] The energy-saving performance of the oil product of the present application is evaluated by GB / T 14231 "Gear device efficiency determination method". The transmission efficiency of the gear box is determined by this method to represent the energy-saving performance of the oil product. The GB / T 14231 method includes direct power measurement method and loss power measurement method. Generally, when the input and output axes of the gear device are located on the same side in parallel and the efficiency is higher than or equal to 98%, the loss power measurement method should be preferred to determine the transmission efficiency of the gear; when the loss power measurement method cannot be used, if the design efficiency is not higher than 98% or high-precision test equipment is available, the direct power measurement method can also be used to determine the transmission efficiency of the gear. Since the selected gear device design efficiency is not higher than 98%, the direct power measurement method is used.

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

[0061]

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

[0063] The oil film thickness of the present application is tested by using an EHD2 oil film thickness tester. 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 lubricating oil in the lubrication process. The test piece is a test steel ball made of AISI 52100 special alloy steel and a glass test disc plated with a Cr / SiO2 coating. The surface roughness of the steel ball is 10-12 nm, and the roughness of the glass test disc is 10 nm. During the test, the test steel ball is supported by a support seat with a ball bearing from below, and an upward load is applied to it by a loading mechanism to "compress" the glass test disc. The lower half of the test steel ball is immersed in the test oil, and during the test, the glass test disc is driven to rotate by a driving motor below the test cavity, driving the test steel ball to do pure rolling. The test steel ball brings the test oil into the contact area between the test steel ball and the glass test disc, and the loading mechanism loads the steel ball to form a lubricating contact. During the oil film test, a bundle of complex light is emitted from the upper light source, passes through the microscope and the glass test disc to illuminate the contact area. It is reflected back from the surface of the test steel ball. One monochromatic light does not pass through the Si coating and the lubricating oil film of the contact area, and the other monochromatic light passes through the coating and the oil film. Therefore, there is a path difference between the two beams of light. After the spectrometer receives the reflected light, the oil film thickness is calculated according to the path difference by software. The rolling speed of the steel ball during the test is fixed at 2 m·s -1 , the load is 50 N, the Hertz contact pressure is 0.5 GPa, and the test temperature is 40℃.

[0064] The viscosity grade range of the lubricating oil composition in the present application is ISO VG 150-680.

[0065] Examples 1-4

[0066] A preparation method of an energy-saving industrial gear lubricating oil composition, 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) Except for the anti-foaming agent, each component is stirred at 50-70℃ for 3 hours;

[0069] (2) The temperature is reduced to about 45℃, the anti-foaming agent is added, and the stirring is continued for 2 hours.

[0070] The prepared lubricating oil composition is tested, and the typical physical and chemical indexes are shown in Table 2.

[0071] Table 1

[0072]

[0073]

[0074] Table 2

[0075]

[0076] Comparative Examples 1-4

[0077] A lubricating oil composition was prepared in the same manner as in Example 1, except that the proportions of the components in Example 1 were replaced by the proportions 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] From the above test results, it can be seen that if the raw materials are not properly selected, such as if the extreme pressure anti-wear agent used in combination with the friction modifier is other commonly used substances, even if the amount thereof is adjusted to the optimum amount for the properties of the obtained lubricating oil, i.e. the extreme pressure anti-wear properties of the oil meet the technical index requirements of GB 5903 L-CKC or L-CKD, compared with the lubricating oil compositions in Examples 1-4, there is still a problem of a large difference in oil film thickness and transmission efficiency, and the lubricating oil composition does not have energy-saving effects, and also has an adverse effect on the corrosion and rust prevention and oxidation resistance of the lubricating oil composition.

[0084] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing examples, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy-saving industrial gear lubricating oil composition, characterized by, consists of the following components in the following mass percentages: The extreme pressure anti-wear agent is 0.1% to 5%; The friction modifier is 0.01% to 1%; The corrosion 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%; The base oil is the remainder. The extreme pressure anti-wear agent includes one or more of borated butyl zinc thiopropionate, pentadecyl calcium borate, pentadecyl calcium thioborate, sulfur phosphorus triester, and butyl triphenyl phosphorothioate. The friction modifier includes one or more of molybdenum alkyl thiophosphate, molybdenum amine ester, molybdenum carbamate complex, nitrogen-containing borate ester, phosphate ester, and benzotriazole fatty amine salt. The antioxidant is one or more of butyl / octyl diphenylamine, high alkaline value sulfurized alkyl phenol calcium, and polyisobutylene succinimide. The demulsifier is one or more of polyethoxylated fatty alcohol, fatty alcohol polyoxyethylene ether carboxylic acid, and polyisobutylene succinamide. The antifoaming agent is one or more of three-dimensional siloxane, polymethylsilicone oil, and methyl silicone oil ester. The base oil is one or more of HVI Ia500, HVI 120BS, and PAO40.

2. The energy-saving industrial gear lubricating oil composition according to claim 1, characterized by, The extreme pressure anti-wear agent is one or more of borated butyl zinc thiopropionate, pentadecyl calcium borate, pentadecyl calcium thioborate, sulfur phosphorus triester, and butyl triphenyl phosphorothioate. The friction modifier is one or more of phosphate ester, molybdenum amine ester, and benzotriazole fatty amine salt.

3. The energy-saving industrial gear lubricating oil composition according to claim 1 or 2, characterized by, The corrosion and rust inhibitor is one or more of dodecenyl succinic acid half ester, dodecenyl succinic acid, liquid N-oleoyl sarcosine, succinic acid amide derivative, and thiazole and benzotriazole derivative.

4. The energy-saving industrial gear lubricating oil composition according to claim 3, characterized by The corrosion and rust inhibitor is one or more of dodecenyl succinic acid, liquid N-oleoyl sarcosine, and succinic acid amide derivative.

5. The energy-saving industrial gear lubricating oil composition according to any one of claims 1, 2, 4, characterized by, The viscosity index improver is one or more of hydrogenated styrene isoprene, random copolymer of ethylene and a-olefin, and polymethacrylate.

6. The energy-saving industrial gear lubricating oil composition according to claim 5, characterized by The viscosity index improver is hydrogenated styrene isoprene or polymethacrylate.

7. The energy-saving industrial gear lubricating oil composition according to claim 3, characterized by, The viscosity index improver is one or more of hydrogenated styrene isoprene, random copolymer of ethylene and a-olefin, and polymethacrylate.

8. The energy-saving industrial gear lubricating oil composition according to claim 7, characterized by, The viscosity index improver is hydrogenated styrene isoprene or polymethacrylate.

9. The energy-saving industrial gear lubricating oil composition according to any one of claims 1, 2, 4, 6, 7, 8, characterized by, The mass percentages of the components are respectively: The extreme pressure anti-wear agent is 0.2% to 3%; The friction modifier is 0.2% to 1%; The corrosion 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%; The base oil is the remainder.

10. The energy-saving industrial gear lubricating oil composition according to claim 3, characterized by, The mass percentages of the components are respectively: The extreme pressure anti-wear agent is 0.2% to 3%; The friction modifier is 0.2% to 1%; The corrosion 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 anti-foaming agent is 0.001%-0.05%; The viscosity index improver is 0.01%-7.5%; The base oil is the balance.

11. The energy-saving industrial gear lubricating oil composition according to claim 5, characterized by, The mass percentage of each component is respectively: The extreme pressure anti-wear agent is 0.2%-3%; The friction modifier is 0.2%-1%; The corrosion and rust inhibitor is 0.02%-0.5%; The antioxidant is 0.05%-1.5%; The demulsifier is 0.01%-0.03%; The anti-foaming agent is 0.001%-0.05%; The viscosity index improver is 0.01%-7.5%; The base oil is the balance.

12. The method of producing the energy-saving industrial gear lubricating oil composition according to any one of claims 1 to 11, characterized by, It comprises: Except the anti-foaming agent, each raw material is mixed according to the proportion, then the anti-foaming agent is added after temperature reduction, and the lubricating oil composition is obtained by mixing.

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