Long-acting energy-saving air compressor oil and preparation method thereof

Abstract

The invention relates to the technical field of air compressor oil, and particularly discloses long-acting energy-saving air compressor oil which comprises base oil and additives, the base oil comprises, by weight, 60-80 parts of PAO base oil, 10-15 parts of synthetic ester oil and 10-15 parts of oil soluble polyether; the additives comprise 0.1 to 1.0 part of an antioxidant, 0.1 to 0.5 part of an anti-rust agent and 0.1 to 0.5 part of a metal corrosion inhibitor; and 0.5-1.5 parts of a pressure response type additive. The air compressor oil system has excellent performance in the aspects of optimizing the lubricating state of the surface of a friction pair, enhancing the stability and durability of an oil film, intelligently responding to pressure change, prolonging the oil change period and the like, and through the combined action of the advantages, the whole air compressor system can achieve higher energy efficiency ratio and lower energy consumption in the running process, and the energy efficiency of the whole air compressor system is improved. Therefore, the long-acting energy-saving effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of air compressor oil, in particular to a long-lasting energy-saving air compressor oil and a preparation method thereof. Background Art

[0002] Air compressor oil, also known as air compressor lubricant, is a liquid lubricant widely used in various types of machinery. Its main functions include reducing friction, protecting machinery and processed parts, cooling, cleaning, rust prevention, sealing and buffering. Air compressor oil forms a protective film on the metal surface to avoid direct contact between metals, buffer the effect of friction, thereby reducing wear and extending the service life of the equipment.

[0003] However, the existing air compressor oils on the market have some defects. First, since the main function of the air compressor is to compress air and the operating environment is a high temperature and high pressure environment, the air compressor will generate a lot of heat during use. If the cooling performance of the lubricating oil is insufficient, it may cause the equipment to overheat and affect normal operation. Secondly, air compressor oil is easily oxidized at high temperatures, producing impurities such as colloid and sludge, causing oil deterioration and coking, thereby reducing the mechanical efficiency of the equipment. In addition, air compressor oil may accelerate aging due to excessive temperature or dust contamination during use, further affecting its performance.

[0004] These problems are mainly caused by the fact that the existing air compressor oil is difficult to maintain stable performance under high temperature, high pressure and high load working environment, and is prone to carbon deposits and sediments, increasing the risk of equipment failure. Therefore, it is particularly important to develop a long-lasting and energy-saving air compressor oil. Summary of the invention

[0005] In view of the problem that air compressor oil in the prior art is difficult to maintain stability under high temperature, high pressure and high load working environment, the present invention provides long-lasting energy-saving air compressor oil and a preparation method thereof.

[0006] To achieve the above objectives, the present invention is implemented through the following technical scheme: a long-lasting energy-saving air compressor oil, including a base oil and additives, wherein the base oil includes 60-80 parts of PAO base oil, 10-15 parts of synthetic ester oil, and 10-15 parts of oil-soluble polyether by weight; the additives include 0.1-1.0 parts of antioxidants, 0.1-0.5 parts of rust inhibitors, and 0.1-0.5 parts of metal corrosion inhibitors; and also includes 0.5-1.5 parts of pressure-responsive additives.

[0007] Furthermore, the PAO base oil is PAO20, PAO30 or a combination of the two.

[0008] The synthetic ester oil is a polyol saturated fatty acid ester.

[0009] The oil-soluble polyether is a water-insoluble polyether.

[0010] The antioxidant is an aromatic amine antioxidant, a shielded phenol antioxidant or a phenol ester antioxidant.

[0011] The rust inhibitor is one or more of long-chain carboxylic acid, alkenyl succinic acid, and sorbitan monooleate.

[0012] The metal corrosion inhibitor is a benzotriazole derivative or a thiadiazole derivative.

[0013] Preferably, the pressure-responsive additive is a modified perfluoropolyether. The present invention provides two modification methods, namely, 3-aminopropyltriethoxysilane-modified perfluoropolyether and 3-aminopropyltriethoxysilane and molybdenum disulfide-modified perfluoropolyether.

[0014] Adding the modified perfluoropolyether into the air compressor oil can optimize the formula ratio of the entire air compressor oil, and even without adding extreme pressure anti-wear agents, still achieve excellent extrusion anti-wear effects. The air compressor oil system of the present invention has excellent performance in energy saving, long-term effectiveness, friction performance, etc.

[0015] The internal reason may be that the molecular structure of the modified perfluoropolyether changes under high pressure, or the chemical bonds within the molecule are reorganized, which enhances the interaction between molecules. With the change of molecular structure, these substances can form a more stable protective film on the metal surface, which can effectively isolate the metal surface, reduce direct contact, and thus reduce wear. Furthermore, the protective film formed has a higher oil film strength, so it remains stable under high load and is not easy to break. It is precisely because of the improved stability and strength of the protective film that the wear resistance of the material is also enhanced, which enables the air compressor oil to maintain a good lubrication effect after long-term operation.

[0016] The first modification method, specifically, when the modified perfluoropolyether is 3-aminopropyltriethoxysilane modified perfluoropolyether, preferably, in the modified perfluoropolyether, the weight ratio of the perfluoropolyether to 3-aminopropyltriethoxysilane is 4-4.5:1.

[0017] Through the above technical scheme, the weight proportion of perfluoropolyether and 3-aminopropyltriethoxysilane is in the range of 4-4.5:1, and the two have good compatibility, which can not only provide excellent lubrication performance and high temperature stability for air compressor oil, but also have excellent improvement effect on the wear resistance and antioxidant performance of the oil.

[0018] Under high pressure, the silane oxygen group (Si-O-C2H5) in the 3-aminopropyltriethoxysilane molecule will undergo a hydrolysis reaction to generate active silanol (Si-OH). The active silanol can undergo a condensation reaction with the hydroxyl group (M-OH) on the metal surface to form a stable silicon oxygen bond (SiOM), thereby forming a dense, chemically bonded protective film on the metal surface. This protective film not only enhances the strength and stability of the oil film, but also improves its wear resistance and corrosion resistance.

[0019] At the same time, the amino group (NH2) in the 3-aminopropyltriethoxysilane molecule also has a certain reactivity and can react with other functional groups on the metal surface to further enhance the bonding force between the oil film and the metal surface.

[0020] Further, the modified perfluoropolyether is prepared by the following steps:

[0021] Dissolve 3-aminopropyltriethoxysilane in a mixed solvent of toluene and methanol, keep the concentration of 3-aminopropyltriethoxysilane in the mixed solution at 0.1-0.3 mol / L, increase the temperature and keep the temperature at 50-60°C; add perfluoropolyether, continue stirring for 6-8 hours, dry at 40-50°C, remove the residual solvent, and obtain 3-aminopropyltriethoxysilane modified perfluoropolyether.

[0022] By selecting the solvent in which 3-aminopropyltriethoxysilane is dissolved, controlling the concentration, and adjusting the temperature during the preparation process, the modification of perfluoropolyether by 3-aminopropyltriethoxysilane is achieved, and the fluidity, permeability and lubrication properties of the modified perfluoropolyether under high-pressure environment are adjusted, ensuring that the oil film can maintain stable performance under different working conditions.

[0023] In addition, the introduction of 3-aminopropyltriethoxysilane can also improve the compatibility of perfluoropolyether with other additives, improve its dispersibility and stability in the air compressor oil system, reduce defects and unevenness in the oil film, and further improve the overall performance of the air compressor oil.

[0024] Specifically, in the mixed solvent of toluene and methanol, the volume ratio of toluene to methanol is 1:1.

[0025] The second modification method, specifically, when the modified perfluoropolyether is 3-aminopropyltriethoxysilane and molybdenum disulfide modified perfluoropolyether, preferably, the weight ratio between the perfluoropolyether and molybdenum disulfide and 3-aminopropyltriethoxysilane is 3-3.5:1-1.5:1.

[0026] As a layered material, molybdenum disulfide has weak van der Waals forces between its layers, making it easy to slip under shear force. When molybdenum disulfide is added to the air compressor oil system, it can form a physical adsorption film on the friction surface, reducing direct contact and wear between metal surfaces. At the same time, molybdenum disulfide also has a certain self-repairing ability, which can release new lubricant molecules at the wear site, further extending the service life of the oil film.

[0027] By compounding a certain amount of molybdenum disulfide, the synergistic effect between molybdenum disulfide, 3-aminopropyltriethoxysilane and perfluoropolyether is enhanced. The physical adsorption film of molybdenum disulfide provides more reaction sites for 3-aminopropyltriethoxysilane, making it easier for 3-aminopropyltriethoxysilane to chemically bond with the metal surface. At the same time, the chemical bonding of 3-aminopropyltriethoxysilane enhances the stability and durability of the physical adsorption film of molybdenum disulfide.

[0028] Furthermore, the particle size of the molybdenum disulfide is 30-40nm.

[0029] The use of molybdenum disulfide of this particle size level to modify perfluoropolyether makes the pressure-responsive additive have higher extreme pressure and anti-wear capabilities as a whole. The molybdenum disulfide of this particle size level has a small size and a large specific surface area. After modification, it is used as an additive and has good suspension stability in the engine oil, which helps to maintain its uniform distribution in the engine oil and reduce the occurrence of precipitation; during the operation inside the air compressor, it can form a more uniform and firmer protective film on the friction surface, thereby providing better lubrication. And it has also been proven by experiments that it has excellent effects in terms of anti-oxidation, which has a qualitative improvement in the mileage of air compressor oil.

[0030] Further, the modified perfluoropolyether is prepared by the following steps:

[0031] First, immerse molybdenum disulfide in 3-aminopropyltriethoxysilane for 4-6 hours;

[0032] Molybdenum disulfide is immersed in 3-aminopropyltriethoxysilane, so that the surface of the molybdenum disulfide powder is covered with 3-aminopropyltriethoxysilane, thereby improving the compatibility and adhesion between the subsequent molybdenum disulfide and the perfluoropolyether matrix.

[0033] 3-aminopropyltriethoxysilane impregnated with molybdenum disulfide is dissolved in a mixed solvent of toluene and methanol, the concentration of 3-aminopropyltriethoxysilane in the mixed solution is maintained at 0.1-0.3 mol / L, the temperature is increased and maintained at 50-60°C; perfluoropolyether is added, stirring is continued for 6-8 hours, and drying is performed at 40-50°C to remove the residual solvent to obtain 3-aminopropyltriethoxysilane and molybdenum disulfide modified perfluoropolyether.

[0034] Here, in the mixed solvent of toluene and methanol, the volume ratio of toluene to methanol is 1:1.

[0035] By adjusting parameters such as the ratio and addition order of molybdenum disulfide and 3-aminopropyltriethoxysilane modified perfluoropolyether, the active ingredients of the modified perfluoropolyether are quickly released and migrate to the friction surface to form an effective protective film under high pressure, thereby giving full play to the role of molybdenum disulfide.

[0036] Preferably, the perfluoropolyether used in the above two modification methods is a Z-type perfluoropolyether with a molecular weight of 2000-5000.

[0037] Perfluoropolyether has various synthesis methods. According to the different monomers and polymerization methods used, four types of perfluoropolyether with different molecular structures, namely K-type, Y-type, Z-type and D-type, are obtained. This patent selects Z-type perfluoropolyether as a pressure-responsive additive in air compressor oil. This is because Z-type perfluoropolyether is a linear polymer formed by photo-oxidation of tetrafluoroethylene under ultraviolet light. Although K-type, Y-type and D-type PFPE also have excellent chemical stability and high temperature resistance, their molecular structures are not suitable for use as pressure-responsive additives, and the same is true after testing.

[0038] Furthermore, the present invention limits the molecular weight of perfluoropolyether to between 2000 and 5000. Within this range, the Z-type perfluoropolyether can maintain good fluidity and permeability while providing sufficient lubrication performance, thereby meeting the use requirements of air compressor oil.

[0039] The invention provides a preparation method of long-acting energy-saving air compressor oil, comprising the following steps: adding PAO base oil, antioxidant, pressure-responsive additive and rust inhibitor into a container, stirring for 20 to 30 minutes until the oil is uniform; after heating to 50 to 60° C., adding synthetic ester oil, oil-soluble polyether and metal corrosion inhibitor in sequence, stirring for 20 to 30 minutes to obtain the long-acting energy-saving air compressor oil.

[0040] Beneficial effects:

[0041] The present invention adopts air compressor oil prepared by pressure-responsive additives. The additives rely on chemical bonding and surface modification, synergistic effects with other substances in the system, and pressure responsive mechanisms in high-pressure environments and other methods to work together. Under high-pressure environments, the active ingredients are released to enhance the strength and stability of the oil film. The friction coefficient is significantly reduced, abnormal wear is reduced, and the accident rate and energy consumption of the equipment are effectively reduced mainly by optimizing the lubrication performance of the friction pair surface.

[0042] Tests have proven that this additive has excellent extreme pressure, anti-wear and antioxidant properties. Under simulated high-temperature oxidation test conditions, the oil can run for up to 12,000 hours without significant oxidative decomposition, far exceeding the 2,000-4,000-hour life of common oils on the market, greatly reducing oil change cycles and maintenance costs.

[0043] The air compressor oil system of the present invention performs well in optimizing the lubrication state of the friction pair surface, enhancing the stability and durability of the oil film, intelligently responding to pressure changes, and extending the oil change cycle. These advantages work together to enable the entire air compressor system to achieve higher energy efficiency and lower energy consumption during operation, thereby achieving long-term energy saving effects. DETAILED DESCRIPTION

[0044] The specific embodiments of the present invention are described in detail below. The present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the disclosed specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used are only for describing specific embodiments and do not limit the present invention.

[0045] A long-lasting energy-saving air compressor oil comprises a base oil and additives. In parts by weight, the base oil comprises 60-80 parts of a PAO base oil, 10-15 parts of a synthetic ester oil, and 10-15 parts of an oil-soluble polyether; the additives comprise 0.1-1.0 parts of an antioxidant, 0.1-0.5 parts of a rust inhibitor, and 0.1-0.5 parts of a metal corrosion inhibitor; and the additive further comprises 0.5-1.5 parts of a pressure-responsive additive.

[0046] Furthermore, the PAO base oil is PAO20, PAO30 or a combination of the two.

[0047] The synthetic ester oil is a polyol saturated fatty acid ester.

[0048] The oil-soluble polyether is selected from RJ-150 or RJ-220 produced by Jilin Ruiji Special Chemicals Co., Ltd.

[0049] The antioxidant is an aromatic amine antioxidant, a shielded phenol antioxidant or a phenol ester antioxidant.

[0050] The rust inhibitor is one or more of long-chain carboxylic acid, alkenyl succinic acid, and sorbitan monooleate.

[0051] The metal corrosion inhibitor is a benzotriazole derivative or a thiadiazole derivative.

[0052] The pressure-responsive additive is a modified perfluoropolyether. The invention provides two modification methods, namely, 3-aminopropyltriethoxysilane modified perfluoropolyether and 3-aminopropyltriethoxysilane and molybdenum disulfide modified perfluoropolyether.

[0053] The following modification processes all require that the raw materials are kept clean to avoid any possible impurities interfering with the subsequent modification and the preparation process of the air compressor oil.

[0054] In the first modification method, when the modified perfluoropolyether is 3-aminopropyltriethoxysilane modified perfluoropolyether, preferably, in the modified perfluoropolyether, the weight ratio of the perfluoropolyether to 3-aminopropyltriethoxysilane is 4-4.5:1. In a specific embodiment, the weight ratio can be 4:1, 4.1:1, 4.2:1, 4.3:1, 4.4:1, or 4.5:1.

[0055] The modified perfluoropolyether is prepared by the following steps:

[0056] Dissolve 3-aminopropyltriethoxysilane in a mixed solvent of toluene and methanol, maintain the concentration of 3-aminopropyltriethoxysilane in the mixed solution at 0.1-0.3 mol / L, in a specific embodiment, the concentration of the mixed solution can be 0.1 mol / L, 0.2 mol / L, 0.3 mol / L, increase the temperature and maintain the temperature within the range of 50-60°C; add perfluoropolyether, continue stirring for 6-8 hours, dry at a temperature range of 40-50°C, remove the residual solvent, and obtain 3-aminopropyltriethoxysilane modified perfluoropolyether.

[0057] Specifically, in the mixed solvent of toluene and methanol, the volume ratio of toluene to methanol is 1:1.

[0058] The second modification method, when the modified perfluoropolyether is 3-aminopropyltriethoxysilane and molybdenum disulfide modified perfluoropolyether, preferably, the weight ratio between the perfluoropolyether and molybdenum disulfide and 3-aminopropyltriethoxysilane is 3-3.5:1-1.5:1. In a specific embodiment, the weight ratio can be 3:1:1, 3.1:1.1:1, 3.2:1.2:1, 3.3:1.3:1, 3.4:1.4:1, 3.5:1.5:1.

[0059] Wherein, the particle size of the molybdenum disulfide is 30-40nm.

[0060] The modified perfluoropolyether is prepared by the following steps:

[0061] First, immerse molybdenum disulfide in 3-aminopropyltriethoxysilane for 4-6 hours;

[0062] Molybdenum disulfide is immersed in 3-aminopropyltriethoxysilane, so that the surface of the molybdenum disulfide powder is covered with 3-aminopropyltriethoxysilane, thereby improving the compatibility and adhesion between the subsequent molybdenum disulfide and the perfluoropolyether matrix.

[0063] 3-aminopropyltriethoxysilane impregnated with molybdenum disulfide is dissolved in a mixed solvent of toluene and methanol, and the concentration of 3-aminopropyltriethoxysilane in the mixed solution is maintained at 0.1-0.3 mol / L. In a specific embodiment, the concentration of the mixed solution can be 0.1 mol / L, 0.2 mol / L, and 0.3 mol / L. The temperature is increased and maintained in the range of 50-60°C; perfluoropolyether is added, and stirring is continued for 6-8 hours, and then dried at 40-50°C to remove the residual solvent to obtain 3-aminopropyltriethoxysilane and molybdenum disulfide modified perfluoropolyether.

[0064] Here, in the mixed solvent of toluene and methanol, the volume ratio of toluene to methanol is 1:1.

[0065] Preferably, the perfluoropolyether used in the above two modification methods is a Z-type perfluoropolyether with a molecular weight of 2000-5000.

[0066] Furthermore, the present invention limits the molecular weight of perfluoropolyether to between 2000 and 5000. Within this range, the Z-type perfluoropolyether can maintain good fluidity and permeability while providing sufficient lubrication performance, thereby meeting the use requirements of air compressor oil.

[0067] The invention provides a preparation method of long-acting energy-saving air compressor oil, comprising the following steps: adding PAO base oil, antioxidant, pressure-responsive additive and rust inhibitor into a container, stirring for 20 to 30 minutes until the oil is uniform; after heating to 50 to 60° C., adding synthetic ester oil, oil-soluble polyether and metal corrosion inhibitor in sequence, stirring for 20 to 30 minutes to obtain the long-acting energy-saving air compressor oil.

[0068] The following is an explanation of the embodiments.

[0069] The raw materials used in the embodiments of the present invention can all be purchased directly from the market.

[0070] Wherein: the perfluoropolyether is a Z-type perfluoropolyether with a molecular weight of 2000-5000; the particle size of molybdenum disulfide is in the range of 30-40nm;

[0071] Preparation example of pressure-responsive additive

[0072] Preparation Example 1

[0073] In this preparation example, the weight ratio of perfluoropolyether to 3-aminopropyltriethoxysilane is 4:1. The preparation method is as follows: 3-aminopropyltriethoxysilane is dissolved in a mixed solvent of toluene and methanol in a volume ratio of 1:1, the concentration of 3-aminopropyltriethoxysilane in the mixed solution is maintained at 0.3 mol / L, the temperature is increased and maintained in the range of 50-60°C; after adding perfluoropolyether, stirring continuously for 6-8 hours, drying at a temperature range of 40-50°C, removing the residual solvent, and obtaining 3-aminopropyltriethoxysilane modified perfluoropolyether.

[0074] Preparation Example 2

[0075] In this preparation example, the weight ratio of perfluoropolyether to 3-aminopropyltriethoxysilane is 4.3:1. The preparation method is as follows: 3-aminopropyltriethoxysilane is dissolved in a mixed solvent of toluene and methanol in a volume ratio of 1:1, the concentration of 3-aminopropyltriethoxysilane in the mixed solution is maintained at 0.2 mol / L, the temperature is increased and maintained in the range of 50-60°C; after adding perfluoropolyether, stirring continuously for 6-8 hours, drying at a temperature range of 40-50°C, removing the residual solvent, and obtaining 3-aminopropyltriethoxysilane modified perfluoropolyether.

[0076] Preparation Example 3

[0077] In this preparation example, the weight ratio of perfluoropolyether to 3-aminopropyltriethoxysilane is 4.5:1. The preparation method is as follows: 3-aminopropyltriethoxysilane is dissolved in a mixed solvent of toluene and methanol in a volume ratio of 1:1, the concentration of 3-aminopropyltriethoxysilane in the mixed solution is maintained at 0.1 mol / L, the temperature is increased and maintained in the range of 50-60°C; after adding perfluoropolyether, stirring continuously for 6-8 hours, drying at a temperature range of 40-50°C, removing the residual solvent, and obtaining 3-aminopropyltriethoxysilane modified perfluoropolyether.

[0078] Preparation Example 5

[0079] In this preparation example, the weight ratio of perfluoropolyether and molybdenum disulfide to 3-aminopropyltriethoxysilane is 3:1:1. The preparation method is as follows: first, completely immerse molybdenum disulfide in 3-aminopropyltriethoxysilane for 4-6 hours; dissolve 3-aminopropyltriethoxysilane impregnated with molybdenum disulfide in a mixed solvent of toluene and methanol in a volume ratio of 1:1, keep the concentration of 3-aminopropyltriethoxysilane in the mixed solution at 0.3 mol / L, increase the temperature and keep the temperature in the range of 50-60°C; add perfluoropolyether, continue stirring for 6-8 hours, dry at a temperature range of 40-50°C, remove the residual solvent, and obtain 3-aminopropyltriethoxysilane and molybdenum disulfide modified perfluoropolyether.

[0080] Preparation Example 6

[0081] In this preparation example, the weight ratio of perfluoropolyether to molybdenum disulfide and 3-aminopropyltriethoxysilane is 3.3:1.3:1. The preparation method is as follows: first, completely immerse molybdenum disulfide in 3-aminopropyltriethoxysilane for 4-6 hours; dissolve 3-aminopropyltriethoxysilane impregnated with molybdenum disulfide in a mixed solvent of toluene and methanol in a volume ratio of 1:1, keep the concentration of 3-aminopropyltriethoxysilane in the mixed solution at 0.2 mol / L, increase the temperature and keep the temperature in the range of 50-60°C; add perfluoropolyether, continue stirring for 6-8 hours, dry at a temperature range of 40-50°C, remove the residual solvent, and obtain 3-aminopropyltriethoxysilane and molybdenum disulfide modified perfluoropolyether.

[0082] Preparation Example 7

[0083] In this preparation example, the weight ratio of perfluoropolyether to molybdenum disulfide and 3-aminopropyltriethoxysilane is 3.5:1.5:1. The preparation method is as follows: first, completely immerse molybdenum disulfide in 3-aminopropyltriethoxysilane for 4-6 hours; dissolve 3-aminopropyltriethoxysilane impregnated with molybdenum disulfide in a mixed solvent of toluene and methanol in a volume ratio of 1:1, keep the concentration of 3-aminopropyltriethoxysilane in the mixed solution at 0.1 mol / L, increase the temperature and keep the temperature in the range of 50-60°C; add perfluoropolyether, continue stirring for 6-8 hours, dry at a temperature range of 40-50°C, remove the residual solvent, and obtain 3-aminopropyltriethoxysilane and molybdenum disulfide modified perfluoropolyether.

[0084] Example 1

[0085] PAO base oil, antioxidant, pressure-responsive additive and rust inhibitor are added into a container, and stirred for 20 to 30 minutes until the oil is uniform; after heating to 50 to 60° C., synthetic ester oil, oil-soluble polyether and metal corrosion inhibitor are added in sequence, and stirred for 20 to 30 minutes to obtain long-lasting energy-saving air compressor oil.

[0086] The weight parts of each component in Example 1 are shown in Table 1.

[0087] Embodiment 2-4

[0088] The preparation methods of Examples 2-4 are the same as those of Example 1, except that different raw materials are used and the weight fractions of each component are different from those of Example 1, as shown in Table 1.

[0089] Embodiment 5-9

[0090] The difference between Example 5-9 and Example 4 is that the preparation examples of the pressure-responsive additives selected in Example 5-9 and Example 4 are different. The corresponding pressure-responsive additives used in Example 5-9 are prepared as 2-6, as shown in Table 1.

[0091] Table 1: Weight percentage of each component in each embodiment of Examples 1-9

[0092]

[0093]

[0094] Comparative Example 1

[0095] Commercially available special air compressor oil for screw air compressors.

[0096] Comparative Example 2

[0097] The difference between this comparative example and Example 1 is that this comparative example uses an equal amount of perfluoropolyether to replace the pressure-responsive additive.

[0098] Comparative Example 3

[0099] The difference between this comparative example and Example 7 is that the particle size of the molybdenum disulfide used in this comparative example is less than 30 nm.

[0100] Comparative Example 4

[0101] The difference between this comparative example and Example 7 is that the particle size of the molybdenum disulfide used in this comparative example is 40-50 nm.

[0102] Comparative Example 5

[0103] The difference between this comparative example and Example 1 is that the molecular weight of the perfluoropolyether used in this comparative example is 5000-8000.

[0104] Comparative Example 6

[0105] The difference between this comparative example and Example 1 is that the molecular weight of the perfluoropolyether used in this comparative example is 1000-2000.

[0106] Comparative Example 7

[0107] The difference between this comparative example and Example 1 is that in the preparation process of this comparative example, the preparation example is slightly different. In the preparation example of this comparative example, 3-aminopropyltriethoxysilane is dissolved in a mixed solvent of toluene and methanol in a volume ratio of 1.5:1.

[0108] Comparative Example 8

[0109] The difference between this comparative example and Example 1 is that in the preparation process of this comparative example, the preparation example is slightly different. In the preparation example of this comparative example, 3-aminopropyltriethoxysilane is dissolved in a mixed solvent of toluene and methanol in a volume ratio of 1:1.5.

[0110] The oil products of Examples 1-9 and Comparative Examples 1-6 were subjected to performance tests, and the test results are shown in Table 2.

[0111] Table 2: Performance test data of oil products of Examples 1-9 and Comparative Examples 1-6

[0112]

[0113] (Continued from the above table)

[0114]

[0115]

[0116] Experimental data show that the air compressor oils prepared in Examples 1-9 have lower kinematic viscosity and better fluidity than the commercially available air compressor oil in Comparative Example 1 under the same working conditions. The oil with a low friction coefficient generates less friction during lubrication, which helps to reduce internal friction and thus reduce overall energy consumption.

[0117] Under simulated high-temperature oxidation test conditions, the air compressor oil prepared in Examples 1-9 can operate for up to 10,000 hours, or even up to 12,000 hours, without significant oxidative decomposition, indicating that the oil has good antioxidant stability and thermal stability, and can maintain its performance for a longer period of time, thereby extending the oil change cycle and the service life of the maintenance equipment. In Comparative Example 1, the oil change cycle is extended by 200% compared with ordinary oil.

[0118] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present invention and do not limit the scope of protection of the patent of the present invention.

Claims

1. A long-lasting energy-saving air compressor oil, comprising a base oil and an additive, characterized in that: In terms of weight, the base oil includes 60-80 parts of PAO base oil, 10-15 parts of synthetic ester oil, and 10-15 parts of oil-soluble polyether; the additives include 0.1-1.0 parts of antioxidants, 0.1-0.5 parts of rust inhibitors, and 0.1-0.5 parts of metal corrosion inhibitors; and also include 0.5-1.5 parts of pressure-responsive additives.

2. The long-lasting energy-saving air compressor oil according to claim 1, characterized in that: The pressure-responsive additive is a modified perfluoropolyether.

3. The long-lasting energy-saving air compressor oil according to claim 2, characterized in that: The modified perfluoropolyether is 3-aminopropyltriethoxysilane modified perfluoropolyether.

4. The long-lasting energy-saving air compressor oil according to claim 3, characterized in that: In the modified perfluoropolyether, the weight ratio of the perfluoropolyether to 3-aminopropyltriethoxysilane is 4-4.5:

1.

5. The long-lasting energy-saving air compressor oil according to claim 4, characterized in that: The modified perfluoropolyether is prepared by the following steps: Dissolve 3-aminopropyltriethoxysilane in a mixed solvent of toluene and methanol, maintain the concentration of 3-aminopropyltriethoxysilane in the mixed solution at 0.1-0.3 mol / L, increase the temperature and maintain the temperature at 50-60°C; add perfluoropolyether, continue stirring for 6-8 hours, dry at 40-50°C, remove the residual solvent, and obtain 3-aminopropyltriethoxysilane modified perfluoropolyether.

6. The long-lasting energy-saving air compressor oil according to claim 2, characterized in that: The modified perfluoropolyether is a perfluoropolyether modified by 3-aminopropyltriethoxysilane and molybdenum disulfide.

7. The long-lasting energy-saving air compressor oil according to claim 6, characterized in that: The weight ratio of the perfluoropolyether, molybdenum disulfide and 3-aminopropyltriethoxysilane is 3-3.5:1-1.5:

1.

8. The long-lasting energy-saving air compressor oil according to claim 7, characterized in that: The modified perfluoropolyether is prepared by the following steps: First, immerse molybdenum disulfide in 3-aminopropyltriethoxysilane for 4-6 hours; The 3-aminopropyltriethoxysilane impregnated with molybdenum disulfide is dissolved in a mixed solvent of toluene and methanol, the concentration of 3-aminopropyltriethoxysilane in the mixed solution is maintained at 0.1-0.3 mol / L, the temperature is increased and maintained at 50-60°C; perfluoropolyether is added, and stirring is continued for 6-8 hours, and then dried at 40-50°C to remove the residual solvent to obtain 3-aminopropyltriethoxysilane and molybdenum disulfide modified perfluoropolyether.

9. The long-lasting energy-saving air compressor oil according to claim 3 or 6, characterized in that: The perfluoropolyether is a Z-type perfluoropolyether with a molecular weight of 2000-5000.

10. The method for preparing a long-lasting energy-saving air compressor oil according to claim 1, characterized in that: The following steps are involved: Add PAO base oil, antioxidant, pressure-responsive additive and rust inhibitor into the container and stir for 20 to 30 minutes until the oil is uniform; After heating to 50-60° C., the synthetic ester oil, oil-soluble polyether and metal corrosion inhibitor are added in sequence, and stirred for 20-30 minutes to obtain a long-lasting energy-saving air compressor oil.

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