A low-odor, environmentally friendly industrial gear oil composition and its application

Abstract

The present invention relates to lubricating oil, and specifically to a low-odor, environmentally friendly industrial gear oil composition and its application. The industrial gear oil composition provided by the present invention contains additives and base oil; the additives include: low-odor extreme pressure agents, low-odor anti-wear agents, sealing expansion agents, antioxidants, and friction modifiers. The low-odor, environmentally friendly industrial gear oil composition described in the present invention has low odor, good extreme pressure and anti-wear properties, excellent compatibility with rubber sealing materials and antioxidant properties; it can be used to protect the gearbox tooth surface in a sealed environment and improve the equipment operating environment. It is particularly suitable for industries such as hydropower, shipping, and manufacturing that have high requirements for odor, sealing, and environmental protection.

Description

Technical Field

[0001] The invention relates to lubricating oil, in particular to a low-odor, environment-friendly industrial gear oil composition and application thereof. Background Art

[0002] During the operation of the gearbox, industrial gear oil reduces friction and wear by forming a sufficient oil film between the gear surfaces, and has the functions of buffering, shock resistance, rust prevention, and heat dissipation.

[0003] The formation of oil film is related to the base oil and additive type of the oil. Industrial gear oils mostly use sulfided olefins and thiophosphate amine derivatives as extreme pressure anti-wear agents. Such extreme pressure anti-wear agents can react chemically with the metal surface to form a metal protective film; however, the thioketone components contained in sulfided olefin products and the thiophosphate amine derivatives themselves have a strong odor, which restricts the use of oil in closed environments.

[0004] To this end, researchers have tried to use extreme pressure agents and anti-wear agents with lower odor to replace sulfided olefins and thiophosphate amine derivatives. For example, CN1085938A discloses a variety of low-odor extreme pressure agents and anti-wear agents. However, in actual research, it was found that not any selection of these additives can be compounded with mineral or synthetic base oils to obtain ideal extreme pressure and anti-wear properties.

[0005] In addition, in order to prevent the leakage of liquid, gaseous working media and lubricants in the gearbox, and to prevent external dust, water, gas and other impurities from entering the lubrication parts, the gearbox must use seals. However, in actual use, the gear oil will be in direct contact with the sealing rubber material in the gearbox. If the sealing performance of the gearbox is not good, it will lead to oil leakage, reduced lubrication effect and other problems; similarly, if the gear oil is not compatible with the sealing rubber material, it will also lead to a variety of adverse consequences. For example, excessive expansion or contraction of the sealing rubber material during use will cause abnormal vibration, wear or oil leakage of the gear; in addition, the accelerated aging of the sealing rubber material and lubricating oil will also affect the service life of the gearbox. Therefore, the industry's demand for environmentally friendly oils with excellent compatibility with rubber materials is becoming more and more urgent.

[0006] To this end, researchers have tried to add seal expansion agents and friction modifiers to existing industrial gear oils in order to improve the compatibility of industrial gear oils with rubber materials. However, in actual experiments, it was found that although the prior art has disclosed seal expansion agents and friction modifiers that can be used in lubricating oils, as shown in CN109477021A, there is also the problem that arbitrarily selecting these additives cannot make industrial gear oils have more ideal compatibility with rubber materials. Summary of the invention

[0007] In view of the problems of heavy odor and poor compatibility with rubber materials in existing industrial gear oils, the present invention provides a low-odor and environmentally friendly industrial gear oil composition, which has good extreme pressure, anti-wear and antioxidant properties and also has a low odor, and is suitable for use in a closed environment; at the same time, the composition has good compatibility with rubber materials, and can effectively avoid problems such as abnormal vibration, wear or oil leakage of gears.

[0008] In the first aspect, the industrial gear oil composition provided by the present invention contains additives and base oil; the base oil is a mineral or synthetic base oil; the additives include a low-odor extreme pressure agent and a low-odor anti-wear agent; wherein: the low-odor extreme pressure agent is a mixture of sulfurized fatty acid esters and alkyl polysulfides; the low-odor anti-wear agent is a mixture of thiadiazole derivatives, phosphoamines and thiophosphates.

[0009] The present invention screens existing low-odor extreme pressure agents and anti-wear agents, determines that a mixture of fatty acid esters and alkyl polysulfides is used as the extreme pressure agent of the above-mentioned base oil, and a mixture of thiadiazole derivatives, amine phosphates and thiophosphates is used as the anti-wear agent of the above-mentioned base oil. By compounding the above-mentioned specific extreme pressure agent and anti-wear agent, the industrial gear oil composition using the above-mentioned base oil can have lower odor and ideal extreme pressure and anti-wear performance, and can be used for reducing box tooth surface protection in a sealed environment to improve the equipment operating environment.

[0010] Preferably, the mass ratio of the fatty acid ester to the alkyl polysulfide is 0.1-10:1, preferably 0.5-7:1. The mass ratio of the thiadiazole derivative, the phosphoamine and the thiophosphate is 0.2-5:0.1-5:1, preferably 0.5-2:0.1-2:1. Studies have shown that by controlling the extreme pressure agent and the anti-wear agent within this mass ratio range, the extreme pressure and anti-wear properties of the oil can be improved.

[0011] Further, based on the mass of the industrial gear oil composition, the content of the low-odor extreme pressure agent is 0.05-3.5%; the content of the low-odor anti-wear agent is 0.05-2.5%. Preferably, based on the mass of the industrial gear oil composition, the content of the low-odor extreme pressure agent is 0.05-2.4%; the content of the low-odor anti-wear agent is 0.05-1.3%. Studies have shown that by controlling the extreme pressure agent and the anti-wear agent within this content range, the odor and extreme pressure and anti-wear properties are balanced.

[0012] Furthermore, the industrial gear oil composition also includes a sealing expansion agent and an antioxidant; the sealing expansion agent is selected from any one or a mixture of sulfonyl anilides, saturated fats, aromatic hydrocarbon esters, hydrocarbon phenols, hydrocarbon formates or polyesters; the antioxidant is any one or a mixture of dialkyl dithiophosphates, dialkyl dithioformates, cyclopentane derivatives, alkylated diphenylamines and alkyl pentaerythritol esters.

[0013] The present invention has found that although many sealing expansion agents and antioxidants with good effects have been disclosed in the prior art, when most of these additives are mixed with the above-mentioned specific extreme pressure agents and anti-wear agents, the sealing expansion agents will reduce the extreme pressure and anti-wear properties of the oil products. At the same time, since the extreme pressure and anti-wear agents are mostly active components, they affect the effect of antioxidants, and ordinary antioxidants cannot improve the antioxidant properties of the oil products. The present invention avoids the above problems by screening suitable sealing expansion agents and antioxidants, and produces synergistic effects with extreme pressure agents and anti-wear agents, so that the obtained industrial gear oil composition has excellent compatibility with rubber sealing materials and antioxidant properties, which can effectively reduce the risk of equipment oil leakage.

[0014] Preferably, the sealing expansion agent is a mixture of polyesters and hydrocarbon formate; the mass ratio of the polyesters to the aromatic hydrocarbon esters is 0.2-6:1, preferably 0.5-5:1. The antioxidant is a mixture of alkylated diphenylamine and alkyl pentaerythritol ester compounds; the mass ratio of the alkylated diphenylamine to the alkyl pentaerythritol ester compounds is 0.3-6:1, preferably 0.5-4:1. Studies have shown that by controlling the composition of the sealing expansion agent and the antioxidant within this mass ratio range, the compatibility of the oil with various rubber materials can be improved.

[0015] Furthermore, based on the mass of the industrial gear oil composition, the content of the sealing expansion agent is 0-5.0%; the content of the antioxidant is 0.05-2.0%; preferably, the content of the sealing expansion agent is 0-4.5%; the content of the antioxidant is 0.06-1.8%. Studies have shown that by controlling the sealing expansion agent and the anti-wear agent within this content range, the anti-wear performance of the oil is balanced.

[0016] In addition, the industrial gear oil composition of the present invention further comprises a friction modifier; the friction modifier is any one or a mixture of benzotriazole and its derivatives, sulfurized cottonseed oil, oleic acid, dimer acid, organic boric acid ester and boric acid salt; preferably, the friction modifier is a mixture of benzotriazole fatty amine salt and organic boric acid ester; the mass ratio of the benzotriazole fatty amine salt to the organic boric acid ester is 0.1-8:1, preferably 0.25-5:1. Studies have shown that compared with other conventional friction modifiers, the above friction modifier plays a role in reducing the friction coefficient of the oil.

[0017] Furthermore, the content of the friction modifier is 0.02-2.0% based on the mass of the industrial gear oil composition; preferably, the content of the friction modifier is 0.03-1.0%. Studies have shown that by controlling the friction modifier within this content range, the friction reduction performance and the extreme pressure and anti-wear performance are balanced.

[0018] In a second aspect, the present invention provides the use of the low-odor, environmentally friendly industrial gear oil composition in industrial gear box equipment.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The low-odor, environmentally friendly industrial gear oil composition provided by the present invention has excellent comprehensive performance, and all performance indicators meet the technical requirements of GB5903.

[0021] 2. The present invention screens existing low-odor extreme pressure agents and anti-wear agents and optimizes the combination of extreme pressure agents and anti-wear agents. The obtained industrial gear oil composition has low odor and good extreme pressure and anti-wear properties. It can be used to protect the gear box tooth surface in a sealed environment and improve the equipment operating environment.

[0022] 3. The present invention selects existing sealing expansion agents and antioxidants, and cooperates with the above-mentioned extreme pressure agents and anti-wear agents to make the obtained industrial gear oil composition have excellent compatibility with rubber sealing materials and antioxidant properties, which can effectively reduce the risk of equipment oil leakage, extend the oil change cycle, and prevent environmental pollution caused by oil leakage. It is an environmentally friendly product.

[0023] 4. The industrial gear oil composition obtained by the present invention can be used in various standard gear boxes and large gear boxes, and is particularly suitable for industries such as hydropower, shipping, and manufacturing that have high requirements on odor, sealing, and environmental protection. DETAILED DESCRIPTION

[0024] The first aspect of the present invention provides a low-odor environmentally friendly industrial gear oil composition, which contains additives and base oil; the additives include: low-odor extreme pressure agent, low-odor anti-wear agent, sealing expansion agent, antioxidant, friction modifier.

[0025] According to the present invention, the base oil is a mineral or synthetic base oil.

[0026] According to the present invention, by mass, the content of the low-odor extreme pressure agent is 0.05-3.5%; the content of the low-odor anti-wear agent is 0.05-2.5%; the content of the sealing expansion agent is 0-5.0%; the content of the antioxidant is 0.05-2.0%; the content of the friction modifier is 0.02-2.0%; and the base oil is the balance.

[0027] According to the present invention, by mass, the content of the low-odor extreme pressure agent is 0.05-2.4%; the content of the low-odor anti-wear agent is 0.05-1.3%; the content of the sealing expansion agent is 0-4.5%; the content of the antioxidant is 0.06-1.8%; the content of the friction modifier is 0.03-1.0%; and the mineral or synthetic base oil is the balance.

[0028] In the present invention, the base oil is used in the composition to make up to 100% of the total amount.

[0029] According to the present invention, the low-odor extreme pressure agent is any one or a mixture of several of sulfided fatty acid esters, sulfided triglycerides and alkyl polysulfides;

[0030] Preferably, the low-odor extreme pressure agent is a mixture of fatty acid esters and alkyl polysulfides; the mass ratio of the fatty acid esters to the alkyl polysulfides is 0.1-10:1, preferably 0.5-7:1.

[0031] According to the present invention, the low-odor anti-wear agent is any one or a mixture of several of thiadiazole derivatives, phenylthiophosphate, amine phosphate mixture and thiophosphate;

[0032] Preferably, the low-odor anti-wear agent is a mixture of thiadiazole derivatives, amine phosphate mixed solution and thiophosphate; the mass ratio of the thiadiazole derivatives, amine phosphate mixed solution and the thiophosphate is 0.2-5:0.1-5:1, preferably 0.5-2:0.1-2:1.

[0033] According to the present invention, the sealing expansion agent is any one or a mixture of several of sulfonylanilides, saturated fats, aromatic hydrocarbon esters, hydrocarbon substituted phenols, hydrocarbon substituted formates and polyesters;

[0034] Preferably, the sealing expansion agent is a mixture of polyesters and hydrocarbon formates; the mass ratio of the polyesters to the aromatic hydrocarbon esters is 0.2-6:1, preferably 0.5-5:1.

[0035] According to the present invention, the antioxidant is any one or a mixture of dialkyl dithiophosphates, dialkyl dithioformates, sulfolane derivatives, alkylated diphenylamines and alkyl pentaerythritol esters;

[0036] Preferably, the antioxidant is a mixture of alkylated diphenylamine and alkyl pentaerythritol ester compounds; the mass ratio of the alkylated diphenylamine to the alkyl pentaerythritol ester compound is 0.3-6:1, preferably 0.5-4:1.

[0037] According to the present invention, the friction modifier is any one of benzotriazole and its derivatives, sulfurized cottonseed oil, oleic acid, dimer acid, organic boric acid ester and boric acid salt, or a mixture of several thereof; preferably, the friction modifier is a mixture of benzotriazole fatty amine salt and organic boric acid ester; the mass ratio of the benzotriazole fatty amine salt to the organic boric acid ester is 0.1-8:1, preferably 0.25-5:1.

[0038] In the present invention, the low-odor and environmentally friendly industrial gear oil composition can be prepared by conventional methods in the art by mixing the components according to the proportions. The specific conditions include: the temperature is 45-75° C., a pulse blending process is used, and the pulse blending is performed for 1 hour.

[0039] The second aspect of the present invention provides use of the low-odor, environmentally friendly industrial gear oil composition described in the first aspect in industrial gear box equipment.

[0040] The present invention is further illustrated by the following examples, but the present invention is not limited thereto.

[0041] The components and manufacturers used in the following examples are shown in Table 1.

[0042] Table 1

[0043] Component name Purchasing manufacturers Fatty acid esters RC2315 Rhine Alkyl polysulfide RC2542 Rhine Thiadiazole derivative POUPC6002A Pacific Ocean Ammonium phosphate mixture Irgalube349 BASF Thiophosphate Irgalube353 BASF Polyester KL240 Italmatch Ethyl Hexyl Sebamate Zhengzhou Aikemu Alkylated diphenylamine RF5057 Xinxiang Ruifeng Alkyl Pentaerythritol Ester RC7201 Rhine Benzotriazole fatty amine salt T406E Shenyang Hualun Organic borate Vanlube 289HD Vanderbilt Mineral base oil HVI Ia500+120BS Sinopec Synthetic base oil PAO8+PAO40 Sinopec Sulfurized isobutylene T321 Zibo Huihua Alkyl phosphate amine salt Mobilad C-423 Mobil Antimony dithiocarboxylate Vanlube 73 Vanderbilt Amine Phosphate Vanlube 672 Vanderbilt Amine and high molecular weight phenol mixture Irganox L150 BASF Alkyl phosphite Mobilad G-205 Mobil

[0044] Examples 1-4

[0045] The low-odor, environment-friendly industrial gear oil composition of the present invention can be formulated into a viscosity grade range of ISOVG100-680 as required. The ISOVG220 viscosity grade is used as an example of the low-odor, environment-friendly industrial gear oil composition. The specific components are shown in Table 2, and the typical physical and chemical indicators are shown in Table 3.

[0046] Table 2

[0047]

[0048] Table 3

[0049]

[0050]

[0051] Comparative Examples 1-3

[0052] According to the formula in Table 4 below, the viscosity grade range is ISOVG100-680, and the comparative examples 1-3 of the oil composition with a viscosity grade of ISOVG320 are prepared, and their typical physical and chemical indicators are shown in Table 5. The preparation method of the composition is basically the same as that of the embodiment.

[0053] Table 4

[0054]

[0055]

[0056] Table 5

[0057]

[0058] It can be seen from the data in Table 3 that the industrial gear oil composition of the present invention has low odor, strong compatibility with rubber sealing materials, and good extreme pressure anti-wear performance and antioxidant performance.

[0059] At the same time, according to the test data of Examples 1-4 in Table 3, it can be seen that even if the same extreme pressure agent, anti-wear agent, seal expansion agent, and antioxidant are selected, the performance of the obtained industrial gear oil composition still shows certain differences due to different addition ratios, among which Example 4 has the best comprehensive performance.

[0060] The results in Table 5 show that if the extreme pressure agent, anti-wear agent, seal expansion agent and antioxidant are not properly selected, the prepared industrial gear oil composition has a strong odor irritation and poor sealing compatibility, and there is a risk of oil leakage due to poor compatibility.

[0061] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. An industrial gear oil composition comprising a base oil, a low-odor extreme pressure agent, and a low-odor anti-wear agent, characterized in that: The base oil is a mineral or synthetic base oil; The low odor extreme pressure agent is a mixture of sulfided fatty acid esters and alkyl polysulfides, and the mass ratio of the sulfided fatty acid esters to the alkyl polysulfides is 0.1-10:1; The low-odor anti-wear agent is a mixture of thiadiazole derivatives, phosphate amines and thiophosphates, and the mass ratio of the thiadiazole derivatives, phosphate amines and thiophosphates is 0.2-5:0.1-5:1; The industrial gear oil composition also includes a seal expansion agent and an antioxidant; The sealing expansion agent is a mixture of polyester and ethyl hexyl sebum ester, and the mass ratio of the polyester to ethyl hexyl sebum ester is 1:1-6:1; The antioxidant is a mixture of alkylated diphenylamine and alkyl pentaerythritol ester compounds, and the mass ratio of the alkylated diphenylamine to the alkyl pentaerythritol ester compounds is 0.3-6:

1.

2. The industrial gear oil composition according to claim 1, characterized in that The mass ratio of the sulfided fatty acid esters to the alkyl polysulfide is 0.5-7:1; The mass ratio of the thiadiazole derivative, the phosphoamine and the thiophosphate is 0.5-2:0.1-2:

1.

3. The industrial gear oil composition according to claim 2, characterized in that: Based on the mass of the industrial gear oil composition, the content of the low-odor extreme pressure agent is 0.05-3.5%; the content of the low-odor anti-wear agent is 0.05-2.5%.

4. The industrial gear oil composition according to claim 3, characterized in that Based on the mass of the industrial gear oil composition, the content of the low-odor extreme pressure agent is 0.05-2.4%; the content of the low-odor anti-wear agent is 0.05-1.3%.

5. The industrial gear oil composition according to claim 4, characterized in that The mass ratio of the polyester to the ethyl hexyl sebacic acid ester is 1:1-5:

1.

6. The industrial gear oil composition according to claim 5, characterized in that The mass ratio of the alkylated diphenylamine to the alkyl pentaerythritol ester compound is 0.5-4:

1.

7. The industrial gear oil composition according to claim 6, characterized in that Calculated by the mass of the industrial gear oil composition, the content of the sealing expansion agent is 0.1-5.0%; the content of the antioxidant is 0.05-2.0%.

8. The industrial gear oil composition according to claim 7, characterized in that Calculated by the mass of the industrial gear oil composition, the content of the sealing expansion agent is 0.1-4.5%; the content of the antioxidant is 0.06-1.8%.

9. The industrial gear oil composition according to claim 8, characterized in that The industrial gear oil composition also includes a friction modifier; the friction modifier is any one or a mixture of several of benzotriazole and its derivatives, sulfurized cottonseed oil, oleic acid, dimer acid, organic boric acid ester and boric acid salt.

10. The industrial gear oil composition according to claim 9, characterized in that The friction modifier is a mixture of benzotriazole fatty amine salt and organic boric acid ester; the mass ratio of the benzotriazole fatty amine salt to the organic boric acid ester is 0.1-8:

1.

11. The industrial gear oil composition according to claim 10, characterized in that The mass ratio of the benzotriazole fatty amine salt to the organic borate ester is 0.25-5:

1.

12. The industrial gear oil composition according to claim 11, characterized in that Based on the mass of the industrial gear oil composition, the content of the friction modifier is 0.02-2.0%.

13. The industrial gear oil composition according to claim 12, characterized in that Based on the mass of the industrial gear oil composition, the content of the friction modifier is 0.03-1.0%.

14. Use of the industrial gear oil composition according to any one of claims 1 to 13 in industrial gear box equipment.

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