Environment-friendly heavy-load gear oil and preparation method thereof

Abstract

The invention relates to environment-friendly heavy-load gear oil and a preparation method thereof, and relates to the field of preparation of heavy-load gear oil. The environment-friendly heavy-load gear oil comprises a basic component and a functional additive, the basic component is prepared from the following components in percentage by mass: 70 to 90 percent of isooctyl stearate RJ-1651 and 10 to 30 percent of isooctyl adipate RJ-1422; on the basis of the basic component, the functional additive comprises the following components in percentage by mass: 0.3%-0.7% of molybdenum dialkyl dithiophosphate (MoDTP), 1%-2% of zinc dialkyl dithiophosphate (ZnDDP), 1.5%-2.5% of molybdenum disulfide (MoS2) and 0.3%-0.7% of polytetrafluoroethylene (PTFE). Through compounding of the base oil and the synergistic effect of the four functional additives, the maximum Pb value can reach 1000N, the minimum grinding crack diameter is 0.412 mm, the maximum 28-day biodegradation rate reaches 92%, animal safety tests prove that the gear oil is nontoxic, and the problems that traditional mineral oil gear oil pollutes the environment and is insufficient in bearing capacity are fundamentally solved.

Description

Technical Field

[0001] This invention relates to the field of heavy-duty gear oil preparation, specifically to an environmentally friendly heavy-duty gear oil and its preparation method. Background Technology

[0002] Gear transmission is one of the most important transmission methods in machinery. To prevent gears from wearing out and becoming damaged during operation, lubricants (industrial gear oil) are needed to separate their working surfaces, thus maintaining the efficiency of the gear mechanism and extending its service life. Gear oil is an important type of lubricant, mainly composed of petroleum-based lubricating oils or synthetic lubricating oils, with the addition of extreme pressure anti-wear agents and oiliness agents.

[0003] Gear oil (lubricating oil) is a highly effective and widely used lubricant. Over half a century of development has reduced mechanical failures caused by lubrication problems, thereby extending the lifespan of mechanical equipment. The anti-wear properties of gear oil are crucial to the normal, stable, and safe operation of working parts, and are also key to the smooth operation of automobiles. Therefore, research on gear oil largely focuses on its anti-wear performance. Currently, gear oils have relatively poor friction resistance and load-bearing capacity. Therefore, the development of anti-wear heavy-duty gear oils has become a current research hotspot.

[0004] Furthermore, during use, gear oil inevitably enters the environment through various pathways such as seepage, leakage, spillage, and improper discharge, severely polluting soil and water resources and disrupting the ecological environment and balance. Therefore, developing non-toxic and environmentally friendly gear oils is also one of the current tasks.

[0005] Therefore, traditional techniques need to be improved. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention aims to provide an environmentally friendly heavy-duty gear oil and its preparation method, thereby overcoming the defects of poor load-bearing capacity and poor environmental performance of the aforementioned gear oils.

[0007] To achieve the above objectives, in a first aspect, the present invention provides an environmentally friendly heavy-duty gear oil, the environmentally friendly heavy-duty gear oil comprising basic components and functional additives; the basic components comprising the following components in the indicated mass percentages: isooctyl stearate RJ-1651 70-90%, isooctyl adipic acid RJ-1422 10%-30%; Based on the aforementioned basic components, the functional additives comprise the following components in the indicated mass percentages: molybdenum dialkyl dithiophosphate (MoDTP) 0.3%-0.7%, zinc dialkyl dithiophosphate (ZnDDP) 1%-2%, molybdenum disulfide (MoS2) 1.5%-2.5%, and polytetrafluoroethylene (PTFE) 0.3%-0.7%.

[0008] Furthermore, the environmentally friendly heavy-duty gear oil includes basic components and functional additives; the basic components include the following components in the indicated mass percentages: isooctyl stearate RJ-1651 80%, isooctyl adipic acid RJ-1422 20%; Based on the aforementioned base components, the functional additives comprise the following components in the indicated mass percentages: molybdenum dialkyl dithiophosphate (MoDTP) 0.5%, zinc dialkyl dithiophosphate (ZnDDP) 1.5%, molybdenum disulfide (MoS) 22%, and polytetrafluoroethylene (PTFE) 0.5%.

[0009] Secondly, the present invention provides a method for preparing the aforementioned environmentally friendly heavy-duty gear oil, which is applied to the aforementioned environmentally friendly heavy-duty gear oil, comprising the following process: Weigh each component according to the specified proportions for the environmentally friendly heavy-duty gear oil. Add isooctyl stearate RJ-1422 to isooctyl adipic acid RJ-1651 and stir until homogeneous to obtain a base oil mixture. The base oil mixture is heated to 40-50°C, and the molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) are added under stirring. After complete dissolution, the temperature is raised to 60-70°C, and the molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE) are added under stirring. The mixture is then naturally cooled to room temperature to obtain the environmentally friendly heavy-duty gear oil.

[0010] Furthermore, in the step of adding isooctyl stearate RJ-1651 to isooctyl adipic acid RJ-1422, the stirring speed is 300-500 rpm.

[0011] Furthermore, the steps of adding the molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) under stirring conditions are carried out at a stirring speed of 300-500 rpm.

[0012] Furthermore, the steps of adding the molybdenum disulfide (MoS2) and the polytetrafluoroethylene (PTFE) under stirring conditions are carried out at a stirring speed of 800-1000 rpm.

[0013] Thirdly, the present invention provides the application of the environmentally friendly heavy-duty gear oil described above or the environmentally friendly heavy-duty gear oil prepared by the method described above in improving the load-bearing capacity and environmental performance of gear oil.

[0014] As can be seen from the above technical solution, the technical effects achieved by the present invention are as follows: Significantly improved load-bearing capacity: Through the synergistic effect of base oil compounding and four functional additives, the Pb value can reach up to 1000N and the wear mark diameter is as small as 0.412mm. The load-bearing capacity and anti-wear performance are superior to traditional mineral oil gear oil and commercially available environmentally friendly gear oil, which can meet the requirements of heavy-duty working conditions. Excellent environmental performance: Based on biodegradable RJ-1651 (isooctyl stearate) and RJ-1422 (isooctyl adipate), with the addition of various additives, the biodegradation rate reaches up to 92% in 28 days, and animal toxicity tests have verified that there is no obvious toxicity, thus solving the problem of environmental pollution caused by traditional mineral oil gear oil from the root. Highly economical: Isooctyl stearate RJ-1651 and isooctyl adipate RJ-1422 are inexpensive, 50% cheaper than other base oil components. Therefore, using these two oils as the base components for synthetic oils can greatly reduce production costs, making them highly economical.

[0015] The formulation and preparation process are highly compatible: the preparation process ensures uniform dispersion of solid additives by adding additives in steps and controlling the stirring speed and temperature, avoiding agglomeration, thus guaranteeing the stability of product performance. Moreover, the process is simple and easy to industrialize. Attached Figure Description

[0016] Appendix Figure 1 The image shows the packaging of the purchased isooctyl stearate RJ-1651.

[0017] Appendix Figure 2 The image shows the packaging of the purchased isooctyl adipic acid ester RJ-1422. Detailed Implementation

[0018] The technical solution of the present invention will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on the present invention.

[0019] Existing gear oils have poor load-bearing capacity and poor environmental performance.

[0020] To overcome the above-mentioned defects, in a first aspect, embodiments of the present invention provide an environmentally friendly heavy-duty gear oil, comprising a base component and functional additives; the base component comprises the following components in the indicated mass percentages: isooctyl stearate RJ-1651: 70-90%, isooctyl adipate RJ-1422: 10%-30%; based on the base component, the functional additives comprise the following components in the indicated mass percentages: molybdenum dialkyl dithiophosphate MoDTP: 0.3%-0.7%, zinc dialkyl dithiophosphate ZnDDP: 1%-2%, molybdenum disulfide MoS... 2 ： 1.5%-2.5% and polytetrafluoroethylene (PTFE): 0.3%-0.7%.

[0021] For example, environmentally friendly heavy-duty gear oils include base components and functional additives; the base components include the following components by weight percentage: isooctyl stearate RJ-1651: 80%, isooctyl adipate RJ-1422: 20%; based on the base components, the functional additives include the following components by weight percentage: molybdenum dialkyl dithiophosphate MoDTP: 0.5%, zinc dialkyl dithiophosphate ZnDDP: 1.5%, molybdenum disulfide MoS2: 2% and polytetrafluoroethylene (PTFE): 0.5%.

[0022] For example, the environmentally friendly heavy-duty gear oil includes a base component and functional additives; the base component includes the following components in the following mass percentages: isooctyl stearate RJ-1651: 90%, isooctyl adipate RJ-1422: 10%; based on the base component, the additives include the following components in the following mass percentages: molybdenum dialkyl dithiophosphate MoDTP 0.7%, zinc dialkyl dithiophosphate ZnDDP: 2%, molybdenum disulfide MoS2: 2.5%, and polytetrafluoroethylene PTFE: 0.7%.

[0023] For example, an environmentally friendly heavy-duty gear oil includes base components and functional additives. The base components include the following components in the indicated mass percentages: isooctyl stearate RJ-1651: 70%, isooctyl adipate RJ-1422: 30%. Based on the base components, the additives include the following components in the indicated mass percentages: molybdenum dialkyl dithiophosphate MoDTP: 0.3%, zinc dialkyl dithiophosphate ZnDDP: 1%, molybdenum disulfide MoS2: 1.5% and polytetrafluoroethylene (PTFE): 0.3%.

[0024] Secondly, embodiments of the present invention provide a method for preparing environmentally friendly heavy-duty gear oil, which is applied to the aforementioned environmentally friendly heavy-duty gear oil, comprising the following processes: Weigh each component according to the above-mentioned proportions for environmentally friendly heavy-duty gear oil; Add isooctyl stearate RJ-1422 to isooctyl adipic acid and stir until homogeneous to obtain a base oil mixture; Heat the base oil mixture to 40-50℃, add molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) under stirring. After they are completely dissolved, raise the temperature to 60-70℃, add molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE) under stirring, and let it cool naturally to room temperature to obtain environmentally friendly heavy-duty gear oil.

[0025] For example, the temperature after heating the base oil mixture is a range of values ​​consisting of 40°C, 50°C, 45°C, or any point value.

[0026] For example, after adding molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) under stirring conditions until completely dissolved, the temperature is controlled within a range of 60°C, 65°C, 70°C, or any other value.

[0027] In some embodiments, the step of adding isooctyl stearate RJ-1422 to isooctyl adipic acid is carried out at a stirring speed of 300-500 rpm.

[0028] For example, the stirring speed can be specifically selected as a range of values ​​consisting of 300 rpm, 400 rpm, 500 rpm, or any point value.

[0029] In some embodiments, the steps of adding molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) under stirring conditions are carried out at a stirring speed of 300-500 rpm.

[0030] For example, the stirring speed can be specifically selected as a range of values ​​consisting of 300 rpm, 400 rpm, 500 rpm, or any point value.

[0031] In some embodiments, the steps of adding molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE) under stirring conditions are carried out at a stirring speed of 800-1000 rpm.

[0032] For example, the stirring speed can be specifically selected as a range of values ​​consisting of 800 rpm, 900 rpm, 1000 rpm, or any point value.

[0033] Thirdly, the embodiments of the present invention provide the application of the above-mentioned environmentally friendly heavy-duty gear oil or the environmentally friendly heavy-duty gear oil prepared by the above-mentioned method in improving the load-bearing capacity and environmental performance of gear oil.

[0034] To better illustrate the technical solution of the present invention, the following specific embodiments are provided. It should be understood that, unless otherwise stated, all components used in the embodiments are commercially available.

[0035] The components and formulations in Examples 1-3 are shown in Table 1.

[0036] Table 1 Components and proportions of Examples 1-3

[0037] Example 1 An environmentally friendly heavy-duty gear oil includes a base component and functional additives. The base component includes the following components by weight percentage: isooctyl stearate RJ-1651: 80%, isooctyl adipate RJ-1422: 20%. Based on the base component, the additives include the following components by weight percentage: molybdenum dialkyl dithiophosphate MoDTP: 0.5%, zinc dialkyl dithiophosphate ZnDDP: 1.5%, molybdenum disulfide MoS2: 2%, and polytetrafluoroethylene PTFE: 0.5%.

[0038] The preparation process of the above-mentioned environmentally friendly heavy-duty gear oil is as follows: Weigh each component according to the above-mentioned proportions for environmentally friendly heavy-duty gear oil; Add isooctyl stearate RJ-1651 to isooctyl adipate RJ-1422 and stir evenly at a stirring speed of 300-500 rpm to obtain a base oil mixture. The base oil mixture is heated to 45°C and stirred at 400 rpm. Simultaneously, molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) are added and completely dissolved. The temperature is then raised to 65°C, and molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE) are added while stirring at 900 rpm. The mixture is then allowed to cool naturally to room temperature to obtain the environmentally friendly heavy-duty gear oil.

[0039] Example 2 An environmentally friendly heavy-duty gear oil includes a base component and additives. The base component comprises the following components in the indicated mass percentages: isooctyl stearate RJ-1651: 90%, isooctyl adipate RJ-1422: 10%. Based on the base component, the functional additives comprise the following components in the indicated mass percentages: molybdenum dialkyl dithiophosphate MoDTP: 0.7%, zinc dialkyl dithiophosphate ZnDDP: 2%, molybdenum disulfide MoS2: 2.5%, and polytetrafluoroethylene PTFE: 0.7%.

[0040] The preparation process of the above-mentioned environmentally friendly heavy-duty gear oil is as follows: Weigh each component according to the above-mentioned proportions for environmentally friendly heavy-duty gear oil; Add isooctyl stearate RJ-1422 to isooctyl adipic acid and stir until homogeneous at a stirring speed of 300 rpm to obtain a base oil mixture. The base oil mixture is heated to 40°C and stirred at 300 rpm. Simultaneously, molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) are added and completely dissolved. The temperature is then raised to 60°C, and MoS2 and PTFE are added while stirring at 800 rpm. The mixture is then allowed to cool naturally to room temperature to obtain the environmentally friendly heavy-duty gear oil.

[0041] Example 3 An environmentally friendly heavy-duty gear oil, comprising a base component and functional additives; the base component comprises the following components in the indicated mass percentages: isooctyl stearate RJ-1651: 70%, isooctyl adipate RJ-1422: 30%; based on the base component, the functional additives comprise the following components in the indicated mass percentages: molybdenum dialkyl dithiophosphate MoDTP: 0.3%, zinc dialkyl dithiophosphate ZnDDP: 1%, molybdenum disulfide MoS2: 1.5%, and polytetrafluoroethylene PTFE: 0.3%.

[0042] The preparation process of the above-mentioned environmentally friendly heavy-duty gear oil is as follows: Weigh each component according to the above-mentioned proportions for environmentally friendly heavy-duty gear oil; Add isooctyl stearate RJ-1651 to isooctyl adipic acid RJ-1422 and stir evenly at a stirring speed of 500 rpm to obtain a base oil mixture. The base oil mixture is heated to 40-50℃ and stirred at 500 rpm. Simultaneously, molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) are added and completely dissolved. The temperature is then raised to 70℃, and molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE) are added while stirring at 1000 rpm. The mixture is then allowed to cool naturally to room temperature to obtain the environmentally friendly heavy-duty gear oil.

[0043] Comparative Example 1 Taking Example 1 as an example, the difference from Example 1 is that molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE) are removed.

[0044] Comparative Example 2 Taking Example 1 as an example, the difference from Example 1 is that molybdenum dialkyl dithiophosphate (MoDTP) is replaced with zinc dialkyl dithiophosphate (ZnDDP) in equal amounts.

[0045] Comparative Example 3 Taking Example 1 as an example, the difference from Example 1 is that zinc dialkyl dithiophosphate (ZnDDP) is replaced with molybdenum dialkyl dithiophosphate (MoDTP) in equal amounts.

[0046] Comparative Example 4 Taking Example 1 as an example, the difference from Example 1 is that zinc dialkyl dithiophosphate (ZnDDP) and molybdenum dialkyl dithiophosphate (MoDTP) are removed.

[0047] Performance testing I. Load-bearing capacity test A four-ball friction and wear testing machine was used to test the Pb value (maximum non-seize load) according to GB / T 3142-1982 standard. The higher the Pb value, the stronger the load-bearing capacity. Simultaneously, the wear track diameter (d) was tested under a 392N load for 60 minutes. 392N 60min The smaller the wear mark diameter, the better the wear resistance. The results are shown in Table 2.

[0048] Table 2. Test results of load-bearing capacity of each group of samples

[0049] As shown in Table 2, the environmentally friendly heavy-duty gear oils of Examples 1-3 of the present invention have a load-bearing Pb value as high as 1000N, and the wear mark diameter is as low as 0.412mm under a load of 392N for 60 minutes, indicating that the environmentally friendly heavy-duty gear oils of the present invention have strong load-bearing capacity.

[0050] Comparative Example 1, with the removal of molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE), showed a load capacity as low as 860 N, and a wear track diameter as high as 0.628 mm after 60 minutes under a load of 392 N; indicating that the addition of MoS2 and PTFE can significantly improve the load capacity of gear oil.

[0051] Comparative Examples 2 and 3 showed that replacing molybdenum dialkyl dithiophosphate (MoDTP) with zinc dialkyl dithiophosphate (ZnDDP) and zinc dialkyl dithiophosphate (ZnDDP) with molybdenum dialkyl dithiophosphate (MoDTP) respectively significantly reduced the load-carrying capacity of the gear oils. This indicates that molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) must be used in combination to significantly improve the load-carrying capacity of gear oils, and also verifies their synergistic effect.

[0052] In Comparative Example 4, the removal of zinc dialkyl dithiophosphate (ZnDDP) and molybdenum dialkyl dithiophosphate (MoDTP) resulted in a significant decrease in the load-carrying capacity of the gear oil. This indicates that the addition of molybdenum dialkyl dithiophosphate (MoDTP) and zinc dialkyl dithiophosphate (ZnDDP) can significantly improve the load-carrying capacity of the gear oil.

[0053] II. Safety Performance Testing: Biodegradability: The biodegradability rate after 28 days was tested according to GB / T 21856-2008 standard; Toxicity test: The test animals were 22 SPF-grade, 150-160g, 2-month-old female SD rats from Liaoning Changsheng Biotechnology Co., Ltd., Certificate No.: 210726251100858578. 21 rats were selected for a 48-hour eye drop test and a 14-day back smear test. Before the test, the rats were divided into 7 groups of 3 rats each, and weight changes and allergic reactions (red spots, swelling, etc.) were recorded. The room temperature for the rats was 20℃-22℃. After three days of acclimatization, the eye drop test was conducted. 2ml of Fulinmen sunflower seed oil was instilled into the left eye as a control, and 2ml of sample oil from Examples 1 to Comparative Examples 4 was instilled into the right eye at time intervals of 3 min, 5 min, 10 min, 15 min, 30 min, 1 h, 2 h, 24 h, and 48 h. Observation, recording, and photography were conducted. After rest, 3cm circular areas were cut out on both sides of the rat's back. Three days later, 2ml of sunflower seed oil was dripped into the left back of the rat, and 2ml of the samples from Example 1 to Comparative Example 4 were dripped into the right back. The oil was applied at 24-hour intervals. The skin was then checked for allergies. The rats were observed, recorded, weighed, and photographed. The duration was 14 days.

[0054] Results Table 3.

[0055] Table 3 Environmental performance test results of each sample oil

[0056] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. An environmentally friendly heavy duty gear oil, characterized by, The environment-friendly heavy load gear oil comprises a base component and a functional additive; the base component comprises components with the following mass proportions: isooctyl stearate RJ-1651 70-90%, isooctyl adipate RJ-1422 10%-30%; The functional additive comprises components with the following mass proportions, based on the base component: molybdenum dialkyldithiophosphate MoDTP 0.3%-0.7%, zinc dialkyldithiophosphate ZnDDP 1%-2%, molybdenum disulfide MoS2 1.5%-2.5%, and polytetrafluoroethylene PTFE 0.3%-0.7%.

2. The environmentally friendly heavy duty gear oil according to claim 1, characterized in that, The environment-friendly heavy load gear oil comprises a base component and a functional additive; the base component comprises components with the following mass proportions: isooctyl stearate RJ-1651 70-90%, isooctyl adipate RJ-1422 10%-30%; The functional additive comprises components with the following mass proportions, based on the base component: molybdenum dialkyldithiophosphate MoDTP 0.3%-0.7%, zinc dialkyldithiophosphate ZnDDP 1%-2%, molybdenum disulfide MoS2 1.5%-2.5%, and polytetrafluoroethylene PTFE 0.3%-0.7%.

3. The method of making an environmentally friendly heavy duty gear oil of any of claims 1-2, characterized in that, The environment-friendly heavy load gear oil of any one of claims 1-2 comprises the following process: The components are weighed according to the proportioning of the environment-friendly heavy load gear oil of any one of claims 1-2; The isooctyl adipate RJ-1422 is added to the isooctyl stearate RJ-1651, and stirred uniformly to obtain a base oil mixture; The base oil mixture is heated to 40-50 DEG C, and the molybdenum dialkyldithiophosphate MoDTP and the zinc dialkyldithiophosphate ZnDDP are added under stirring, and after complete dissolution, the temperature is increased to 60-70 DEG C, and the molybdenum disulfide MoS2 and the polytetrafluoroethylene PTFE are added under stirring, and the mixture is naturally cooled to room temperature to obtain the environment-friendly heavy load gear oil.

4. The environmentally friendly heavy duty gear oil according to claim 3, characterized in that, In the step of adding the isooctyl adipate RJ-1422 to the isooctyl stearate RJ-1651, the stirring speed is 300-500 rpm.

5. The environmentally friendly heavy duty gear oil according to claim 3, characterized in that, In the step of adding the molybdenum dialkyldithiophosphate MoDTP and the zinc dialkyldithiophosphate ZnDDP under stirring, the stirring speed is 300-500 rpm.

6. The environmentally friendly heavy duty gear oil according to claim 3, characterized in that, In the step of adding the molybdenum disulfide MoS2 and the polytetrafluoroethylene PTFE under stirring, the stirring speed is 800-1000 rpm.

7. The environment-friendly heavy load gear oil of any one of claims 1-2 or the environment-friendly heavy load gear oil prepared by the method of any one of claims 3-6 is applied to improve the load bearing capacity and environmental performance of the gear oil.

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