Air compressor oils based on coal-based oils and their applications

Abstract

This invention provides an air compressor oil based on coal-derived base oil and its application. By weight, the air compressor oil comprises 63-83 parts coal-derived base oil, 8-16 parts oiliness agent, and 0.5-1.5 parts antioxidant; wherein the coal-derived base oil is a fraction with a distillation range of 500-530°C obtained by sequentially hydroisomerizing dewaxing, hydrorefining, and trimming of Fischer-Tropsch wax. Compared to using polyalphaolefin-type base oil as the base oil, using the aforementioned specific fraction of coal-derived base oil as the base oil can significantly reduce the preparation cost while leveraging the excellent properties of the coal-derived base oil itself. Compared to other ranges, limiting the weight percentages of the above components within the specified range is beneficial for better utilizing the solubilizing effect of the oiliness agent and the antioxidant effect of the antioxidant, thereby improving the overall performance of the air compressor oil, such as lubrication performance and oxidation stability, while also reducing the preparation cost of the air compressor oil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum chemical industry, in particular to an air compressor oil based on coal-derived base oil and application thereof. BACKGROUND

[0002] An air compressor is a kind of gas compression equipment and is widely used. According to the lubrication mode, the air compressor can be divided into an oil-free air compressor and an oil-lubricated air compressor. When the air compressor is driven, the relative sliding speed between the parts is large, which often causes large friction loss and serious wear of the parts. Moreover, long-time movement often causes heating problems. At present, the wear and heating problems are mainly alleviated by using air compressor oil.

[0003] The function of the air compressor oil is to form a protective film between two friction pairs (friction systems) to avoid direct contact between metals, so as to buffer the friction and play a lubricating role to reduce wear and protect the normal operation of the machine. The existing air compressor oil can only achieve one or a few of the multiple performance requirements such as lubricity, wear resistance, rust and corrosion resistance, oxidation stability, etc., and the service life is still difficult to meet the working condition needs in severe environments.

[0004] The existing document (publication No. CN106590877A) discloses a fully synthetic heavy load screw air compressor oil, which comprises: synthetic base oil, high-temperature antioxidant, friction modifier, extreme pressure anti-wear agent, viscosity index improver, pour point depressant, and rust inhibitor. The synthetic base oil component comprises PAO4, PAO8 and diester. The fully synthetic heavy load screw air compressor oil provided by the above technical solution has extremely high oxidation stability and thermal stability, can effectively resist the rise of oil viscosity, greatly reduces the generation of carbon deposits and paint film and the blockage of the oil-gas separator, can meet the lubrication of the screw air compressor under extreme load and extreme temperature, and effectively prolongs the oil change period.

[0005] The existing document (publication No. CN107304380A) discloses an air compressor oil composition. Based on the weight of the lubricating oil composition, the lubricating oil composition contains the following components: 85-99 wt% of lubricating oil base oil, 0.01-10 wt% of anti-oxidation and anti-wear multi-effect additive, 0.01-5 wt% of thio-phenolic ester type antioxidant, 0.02-5 wt% of zinc oxide nanoparticles, 0.01-5 wt% of pour point depressant, and anti-oxidation and anti-wear multi-effect additive. The present application also provides a preparation method of the air compressor oil composition. The air compressor oil composition of the present application has excellent anti-wear and anti-oxidation properties and can be widely applied in the field of air compressor lubrication.

[0006] However, the PAO4, PAO8 and diester used as base oil in the above-mentioned documents, or the mineral oil and / or synthetic oil as base oil, result in high cost of the oil.

[0007] Therefore, it is necessary to study and develop an air compressor oil based on coal-made base oil, which is of great significance to improve the lubricity and oxidation stability of the air compressor oil while reducing the cost. SUMMARY

[0008] The main purpose of the present application is to provide an air compressor oil based on coal-made base oil and its application, so as to solve the problem that the air compressor oil in the prior art is difficult to have excellent lubricity and oxidation stability and low cost.

[0009] In order to achieve the above-mentioned purpose, the present application provides an air compressor oil based on coal-made base oil, which comprises 63-83 parts by weight of coal-made base oil, 8-16 parts by weight of oil agent and 0.5-1.5 parts by weight of antioxidant; wherein the coal-made base oil is a fraction with a distillation range of 500-530℃ obtained by sequentially subjecting Fischer-Tropsch wax to a hydroisomerization dewaxing reaction, a hydrofinishing reaction and cutting.

[0010] Further, the coal-made base oil is CTL8 base oil or the coal-made base oil has a kinematic viscosity of 41.4-50.6mm 2 / s at 40℃ and a viscosity index ≥ 150.

[0011] Further, the oil agent is saturated polyol ester, such as Priolube 3970 of British Cargill Company, Synative ES TMTC of German BASF Company and Synative ES2934 of German BASF Company.

[0012] Further, the antioxidant is selected from one or more of the group consisting of phenyl-α-naphthylamine, p,p'-diisooctyl diphenylamine, 2,6-di-tert-butyl-p-cresol, and 2,6-di-tert-butylphenol; preferably, the antioxidant is selected from a mixture of phenyl-α-naphthylamine and 2,6-di-tert-butyl-p-cresol, a mixture of phenyl-α-naphthylamine and 2,6-di-tert-butylphenol, a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butyl-p-cresol, or a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butylphenol. The mixture is further preferably a mixture of phenyl-α-naphthylamine and 2,6-di-tert-butyl-p-cresol in a weight ratio of (1-2):(2-1), a mixture of phenyl-α-naphthylamine and 2,6-di-tert-butylphenol in a weight ratio of (1-2):(2-1), a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butyl-p-cresol in a weight ratio of (1-2):(2-1), or a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butylphenol in a weight ratio of (1-2):(2-1).

[0013] Furthermore, the air compressor oil also includes an extreme pressure anti-wear agent; preferably, the air compressor oil further includes 0.5 to 5 parts by weight of extreme pressure anti-wear agent; preferably, the extreme pressure anti-wear agent is selected from one or more of the group consisting of dimethyl hydrogen phosphite, dioleate hydrogen phosphite and trilauryl phosphite; more preferably, the weight ratio of extreme pressure anti-wear agent to coal-based oil is (0.012 to 0.048):1.

[0014] Furthermore, the air compressor oil also includes a friction modifier; preferably, by weight, the air compressor oil further includes 6 to 12 parts of friction modifier; preferably, the friction modifier is a polyether compound; preferably, the friction modifier has an average molecular weight of 1000 to 5000 g / mol and a kinematic viscosity of 30 to 100 mm at 40°C. 2 / s of polyalkylene glycol.

[0015] Furthermore, the air compressor oil also includes a rust inhibitor; preferably, the air compressor oil also includes 1 to 3 parts by weight of rust inhibitor; preferably, the rust inhibitor is selected from calcium sulfonate with an alkalinity of ≤400mgKOH / g; more preferably, the rust inhibitor is selected from calcium sulfonate with a calcium content of 1.4 to 2.0%.

[0016] Furthermore, the air compressor oil also includes a metal deactivator; preferably, the air compressor oil further includes 0.5 to 1.5 parts by weight of the metal deactivator; preferably, the metal deactivator is selected from methylbenzotriazole and / or dimercaptothiadiazole by weight.

[0017] Furthermore, by weight, the air compressor oil comprises 63-75 parts coal-based base oil, 10-16 parts oiliness agent, 1-1.5 parts antioxidant, 2-3 parts extreme pressure anti-wear agent, 10-12 parts friction modifier, 2-3 parts rust inhibitor and 1-1.5 parts metal deactivator.

[0018] To achieve the above objectives, another aspect of the present invention provides an application of the coal-based air compressor oil provided in this application in the field of screw air compressors.

[0019] By applying the technical solution of the present invention, compared with the traditional air compressor oil which uses polyalphaolefin (PAO) type base oil as the base oil, the air compressor oil provided in this application uses coal-derived base oil of the specific distillation fraction as the base oil, which can significantly reduce the preparation cost of air compressor oil while giving full play to the excellent performance of coal-derived base oil (such as better lubrication performance).

[0020] The aforementioned specific types of coal-based base oils, combined with oiliness agents and antioxidants, can fully leverage the solubilizing effect of the oiliness agents, resulting in better compatibility between the coal-based base oils and additives such as antioxidants. This allows the antioxidants to fully exert their antioxidant properties, inhibiting the oxidative deterioration of the air compressor oil and giving it better oxidation stability. Compared to other ranges, limiting the weight proportions of coal-based base oils, oiliness agents, and antioxidants to the range described above in this application is beneficial for improving the synergistic effect between the components, better leveraging the solubilizing effect of the oiliness agents and the antioxidant effects of the antioxidants, thereby improving the overall performance of the air compressor oil described above, including its lubrication performance and oxidation stability. Simultaneously, it also helps reduce the manufacturing cost of the air compressor oil, thus facilitating its application in the air compressor field. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the embodiments.

[0022] As described in the background section, existing air compressor oils suffer from the problem of simultaneously possessing excellent lubricity, oxidation stability, and low cost. To address these technical issues, this application provides an air compressor oil based on coal-derived base oil. By weight, the air compressor oil comprises 63-83 parts coal-derived base oil, 8-16 parts oiliness agent, and 0.5-1.5 parts antioxidant; wherein the coal-derived base oil is a fraction with a distillation range of 500-530°C obtained by sequentially hydroisomerizing dewaxing of Fischer-Tropsch wax, followed by hydrogenation supplementary refining, and fractionation.

[0023] Compared to traditional air compressor oils that use polyalphaolefin (PAO) type base oils, the air compressor oil provided in this application uses coal-derived base oil from the aforementioned specific distillation fraction as its base oil. This allows for significant reduction in the production cost of air compressor oils while leveraging the superior properties of coal-derived base oils (such as better lubrication performance).

[0024] The aforementioned specific types of coal-based base oils, combined with oiliness agents and antioxidants, can fully leverage the solubilizing effect of the oiliness agents, resulting in better compatibility between the coal-based base oils and additives such as antioxidants. This allows the antioxidants to fully exert their antioxidant properties, inhibiting the oxidative deterioration of the air compressor oil and giving it better oxidation stability. Compared to other ranges, limiting the weight proportions of coal-based base oils, oiliness agents, and antioxidants to the range described above in this application is beneficial for improving the synergistic effect between the components, better leveraging the solubilizing effect of the oiliness agents and the antioxidant effects of the antioxidants, thereby improving the overall performance of the air compressor oil described above, including its lubrication performance and oxidation stability. Simultaneously, it also helps reduce the manufacturing cost of the air compressor oil, thus facilitating its application in the air compressor field.

[0025] It should be noted that in this application, Pt / ZSM-48 molecular sieve is used as a catalyst in the isomerization treatment of Fischer-Tropsch wax, and an intermittent feeding method is adopted. First, a hydroisomerization dewaxing reaction is carried out, followed by a hydrorefining reaction. The product obtained after the hydrorefining reaction is subjected to atmospheric distillation and vacuum distillation, and the 500-530℃ fraction is taken to obtain the above-mentioned coal-based base oil.

[0026] In a preferred embodiment, the coal-based base oil is CTL8 base oil or has a kinematic viscosity of 41.4–50.6 mm at 40°C. 2 / s, and a viscosity index ≥150. Compared to other types of coal-based base oils, using CTL8 base oil as the base oil component of air compressor oil is beneficial to improving the viscosity-temperature performance, oxidation resistance, and lubrication performance of air compressor oil.

[0027] In a preferred embodiment, the oiling agent is a saturated polyol ester, such as Cargill Priolube 3970, BASF Synative ES TMTC, and BASF Synative ES2934. Compared to other types, using a saturated polyol ester as an oiling agent is beneficial for further exerting its solubilizing effect and improving the compatibility between the components; it also helps to enhance the adsorption between the ester groups in the saturated polyol ester and the friction surface, thereby improving the anti-wear and friction-reducing properties of the air compressor oil.

[0028] In a preferred embodiment, the antioxidant includes, but is not limited to, one or more of the group consisting of phenyl-α-naphthylamine, p,p'-diisooctyl diphenylamine, 2,6-di-tert-butyl-p-cresol, and 2,6-di-tert-butylphenol. Compared to other types of antioxidants, using the above-mentioned antioxidants is beneficial for further inhibiting the oxidative deterioration of air compressor oil, thereby further improving the oxidative stability of air compressor oil.

[0029] To further improve the oxidation stability of air compressor oil, preferably, the antioxidant includes, but is not limited to, a mixture of phenyl-α-naphthylamine and 2,6-di-tert-butyl-p-cresol, a mixture of phenyl-α-naphthylamine and 2,6-di-tert-butylphenol, a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butyl-p-cresol, or a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butylphenol, and more preferably, a weight ratio of (1-2):(2 A mixture of phenyl-α-naphthylamine and 2,6-di-tert-butyl-p-cresol in a weight ratio of (1-2):(2-1), a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butyl-p-cresol in a weight ratio of (1-2):(2-1), or a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butyl-p-cresol in a weight ratio of (1-2):(2-1).

[0030] In a preferred embodiment, the air compressor oil further includes an extreme pressure anti-wear agent. The introduction of the extreme pressure anti-wear agent can inhibit the scratching or wear of metal parts during the operation of the air compressor, thus protecting the metal parts.

[0031] In a preferred embodiment, the air compressor oil further includes 0.5 to 5 parts by weight of extreme pressure anti-wear agent. The weight percentage of the extreme pressure anti-wear agent includes, but is not limited to, the above range. Limiting it within this range is beneficial for improving the protective effect of the air compressor oil on metal components and for extending the service life of the air compressor.

[0032] To further enhance the protective effect of air compressor oil on metal parts and extend the service life of air compressors, the extreme pressure anti-wear agent preferably includes, but is not limited to, one or more of the group consisting of dimethyl hydrogen phosphite, dioleate hydrogen phosphite, and trilauroyl phosphite (such as Dapraphos TLP from Italco, Italy).

[0033] To further enhance the protective effect of air compressor oil on metal parts and extend the service life of air compressors, more preferably, the weight ratio of extreme pressure anti-wear agent to coal-based oil is (0.012~0.048):1.

[0034] In a preferred embodiment, the air compressor oil further includes a friction modifier. The introduction of the friction modifier enables it to form a lubricating protective film on the surface of the metal parts, thereby improving the coefficient of friction of the air compressor oil.

[0035] In a preferred embodiment, the air compressor oil further comprises 6 to 12 parts by weight of a friction modifier. The weight percentage of the friction modifier includes, but is not limited to, the range described above, and limiting it within this range is beneficial for improving the coefficient of friction of the air compressor oil.

[0036] In a preferred embodiment, the friction modifier is a polyether compound. Compared to other types, using polyether compounds as friction modifiers is beneficial for further improving the coefficient of friction of the air compressor oil and further enhancing the protection of metal components in the air compressor.

[0037] To further improve the friction coefficient of air compressor oil and enhance its protective effect on metal components in the air compressor, the friction modifier preferably has an average molecular weight of 1000–5000 g / mol and a kinematic viscosity of 30–100 mmHg at 40°C. 2 / s of polyalkylene glycol, such as Dow Chemical's oil-soluble polyalkylene glycol OSP.

[0038] In a preferred embodiment, the air compressor oil also includes a rust inhibitor. The introduction of the rust inhibitor can inhibit the corrosion of the air compressor oil by external salts, thereby helping to inhibit discoloration and rust, and thus helping to extend the service life of the air compressor.

[0039] In a preferred embodiment, the air compressor oil further includes 1 to 3 parts by weight of rust inhibitor. The weight percentage of the rust inhibitor includes, but is not limited to, the range described above. Limiting it to this range is beneficial for further improving the corrosion resistance of the air compressor oil and for further extending the service life of the air compressor.

[0040] To further improve the corrosion resistance of air compressor oil, preferably, the rust inhibitor includes, but is not limited to, calcium sulfonate with an alkalinity of ≤400mgKOH / g.

[0041] To further improve the corrosion resistance of air compressor oil, preferably, the rust inhibitor includes, but is not limited to, calcium sulfonate with a calcium content of 1.4 to 2.0%.

[0042] In a preferred embodiment, the air compressor oil further includes a metal deactivator. The introduction of the metal deactivator can inhibit the catalytic oxidation of metal components in the air compressor, improve the oxidation resistance of the air compressor oil, and thus extend its service life.

[0043] In a preferred embodiment, the air compressor oil further includes 0.5 to 1.5 parts by weight of a metal deactivator. The weight percentage of the metal deactivator includes, but is not limited to, the above range. Limiting it within this range is beneficial for improving the oxidation resistance of the air compressor oil, thereby extending its service life.

[0044] To further improve the oxidation resistance of air compressor oil and thus further extend its service life, preferably, by weight, the metal deactivator includes, but is not limited to, methylbenzotriazole and / or dimercaptothiadiazole.

[0045] In a preferred embodiment, the air compressor oil, by weight, comprises 63-75 parts coal-based base oil, 10-16 parts oiliness agent, 1-1.5 parts antioxidant, 2-3 parts extreme pressure anti-wear agent, 10-12 parts friction modifier, 2-3 parts rust inhibitor, and 1-1.5 parts metal deactivator. Compared to other types and ranges, air compressor oils with the above-mentioned compound components and amounts exhibit superior lubricity, oxidation stability, wear resistance, corrosion resistance, and extreme pressure properties, and have a longer service life.

[0046] The second aspect of this application also provides a method for preparing the above-mentioned coal-based air compressor oil, comprising: step S1, mixing coal-based oil with an oiliness agent and an antioxidant under heating and stirring conditions to obtain a mixture; wherein the amounts of coal-based oil, oiliness agent and antioxidant, and the type of coal-based oil are defined as described above; step S2, allowing the mixture obtained above to stand, filtering it to obtain air compressor oil.

[0047] The above mixing method can fully mix the components and improve their compatibility; allowing the mixture to stand can make the mixture stable and uniform, thus obtaining air compressor oil.

[0048] In a preferred embodiment, step S1 further includes one or more of the following groups: extreme pressure anti-wear agent, friction modifier, rust inhibitor, and metal deactivator, to obtain a mixture.

[0049] In a preferred embodiment, the heating temperature is 45–65°C, the stirring rate is 1000–2000 r / min, and the stirring time is 2–3 h. The heating temperature, stirring rate, and time include, but are not limited to, the above ranges. Limiting them to these ranges is beneficial for maximizing the lubricity of the coal-based oil, the compatibility of the oiliness agent, and the antioxidant properties of the antioxidant, thereby enhancing the synergistic effect of the components and ultimately improving the overall performance of the resulting air compressor oil.

[0050] In a preferred embodiment, the settling time is 2 to 3 hours. The settling time includes, but is not limited to, the above range, and limiting it within the above range is beneficial to obtaining air compressor oil with more uniform and stable properties.

[0051] A third aspect of this application also provides an application of the aforementioned coal-based air compressor oil in the field of screw air compressors. Compared to traditional air compressor oils that use polyalphaolefin (PAO) type base oils, the air compressor oil provided in this application uses coal-based oil from a specific distillation fraction as its base oil. This significantly reduces the production cost of the air compressor oil while leveraging the excellent properties of the coal-based oil itself (such as better lubrication performance). The specific type of coal-based oil, when combined with oiliness agents and antioxidants, fully utilizes the solubilizing effect of the oiliness agents, ensuring good compatibility between the coal-based oil and additives such as antioxidants. This allows the antioxidants to fully exert their antioxidant effect, resulting in better oxidation stability of the air compressor oil. Compared to other ranges, limiting the weight proportions of coal-based base oil, oiliness agent, and antioxidant to the range described above in this application is beneficial to improving the synergistic effect between the components, better leveraging the solubilizing effect of the oiliness agent and the antioxidant effect of the antioxidant, thereby improving the overall performance of the air compressor oil described above in this application, such as lubrication performance and oxidation stability. At the same time, it is also beneficial to reduce the preparation cost of the air compressor oil, thus facilitating its application in the field of air compressors.

[0052] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0053] Example 1

[0054] The components and dosages of the air compressor oil are shown in Table 1. Among them, the oil-soluble polyalkylene glycol (OSP) has an average molecular weight of 3000 g / mol and a kinematic viscosity of 46 mmHg at 40°C. 2 / s, the total weight of each component is 100 parts.

[0055] A method for preparing air compressor oil based on coal-derived base oil, comprising:

[0056] At 60℃, while stirring at 1000 r / min, coal-based oil, oiliness agent, antioxidant, extreme pressure anti-wear agent, friction modifier, rust inhibitor and metal deactivator of the types and amounts shown in Table 1 were added to CTL8 coal-based oil. After stirring for 2 hours, the mixture was allowed to stand for 2 hours, filtered and packaged to obtain air compressor oil.

[0057] Table 1

[0058]

[0059] Example 2

[0060] Air compressor oil based on coal-derived base oil was prepared using the same preparation method as in Example 1.

[0061] The components and dosages of the air compressor oil are shown in Table 2. Among them, the oil-soluble polyalkylene glycol (OSP) has an average molecular weight of 3000 g / mol and a kinematic viscosity of 46 mmHg at 40°C. 2 / s, the total weight of each component is 100 parts.

[0062] Table 2

[0063]

[0064] Example 3

[0065] Air compressor oil based on coal-derived base oil was prepared using the same preparation method as in Example 1.

[0066] The components and dosages of the air compressor oil are shown in Table 3. Among them, the oil-soluble polyalkylene glycol (OSP) has an average molecular weight of 3000 g / mol and a kinematic viscosity of 46 mmHg at 40°C. 2 / s, the total weight of each component is 100 parts.

[0067] Table 3

[0068]

[0069] Example 4

[0070] Air compressor oil based on coal-derived base oil was prepared using the same preparation method as in Example 1.

[0071] The components and dosages of the air compressor oil are shown in Table 4. Among them, the oil-soluble polyalkylene glycol (OSP) has an average molecular weight of 3000 g / mol and a kinematic viscosity of 46 mmHg at 40°C. 2 / s, the total weight of each component is 100 parts.

[0072] Table 4

[0073]

[0074] Example 5

[0075] Air compressor oil based on coal-derived base oil was prepared using the same preparation method as in Example 1.

[0076] Table 5 shows the components and dosage of each component in the air compressor oil. Among them, the oil-soluble polyalkylene glycol (OSP) has an average molecular weight of 3000 g / mol and a kinematic viscosity of 46 mmHg at 40°C. 2 / s, the total weight of each component is 100 parts.

[0077] Table 5

[0078]

[0079] Example 6

[0080] The total weight of antioxidants is the same as in Example 1, which is 1.5 parts by weight.

[0081] The difference from Example 1 is that the weight ratio of phenyl-α-naphthylamine to 2,6-di-tert-butyl-p-cresol is 1:2.

[0082] Example 7

[0083] The total weight percentage of the base oil and extreme pressure anti-wear agent is the same as in Example 1, which is 66 parts by weight.

[0084] The difference from Example 1 is that the amount of base oil and extreme pressure anti-wear agent added is changed so that the weight ratio of dimethyl hydrogen phosphite to CTL8 base oil is 0.012:1.

[0085] Example 8

[0086] The difference from Example 1 is that the amount of base oil and extreme pressure anti-wear agent added is changed so that the weight ratio of dimethyl hydrogen phosphite to CTL8 base oil is 0.005:1.

[0087] Example 9

[0088] The difference from Example 1 is that the average molecular weight of the polyalkylene glycol is 1000 g / mol, and the kinematic viscosity at 40°C is 32 mm. 2 / s.

[0089] Example 10

[0090] The difference from Example 1 is that the average molecular weight of the polyalkylene glycol is 5000 g / mol, and the kinematic viscosity at 40°C is 68 mm. 2 / s.

[0091] Example 11

[0092] The difference from Example 1 is that the average molecular weight of the polyalkylene glycol is 6000 g / mol, and the kinematic viscosity at 40°C is 125 mm. 2 / s.

[0093] Example 12

[0094] The difference from Example 1 is that the rust inhibitor is calcium alkylbenzene sulfonate (XP106D) with an alkalinity value >400mgKOH / g.

[0095] Example 13

[0096] The difference from Example 1 is that the components do not contain rust inhibitors, and are replaced with an equal amount of CTL8 base oil.

[0097] Example 14

[0098] The difference from Example 1 is that the metal deactivator is a mixture of methylbenzotriazole and dimercaptothiadiazole, and the weight ratio of methylbenzotriazole to dimercaptothiadiazole is 1:1.

[0099] Comparative Example 1

[0100] The difference from Example 1 is that CTL8 base oil was replaced with 250N base oil (SsangYong, Korea) of the same viscosity grade. Sample 1 was obtained by using the same air compressor oil preparation method as in Example 1.

[0101] Comparative Example 2

[0102] The difference from Example 1 is that the composition does not contain oiliness agents and friction modifiers, and is replaced with an equal amount of CTL8 base oil. Sample 2 was obtained by using the same air compressor oil preparation method as in Example 1.

[0103] Comparative Example 3

[0104] The difference from Example 1 is that the components do not contain antioxidants and metal deactivators, and are replaced with an equal amount of CTL8 base oil. Sample 3 was obtained by using the same air compressor oil preparation method as in Example 1.

[0105] Comparative Example 4

[0106] The difference from Example 1 is that an equal amount of CTL6 base oil was used instead of CTL8 base oil. Sample 4 was obtained using the same air compressor oil preparation method as in Example 1.

[0107] Comparative Example 5

[0108] The difference from Example 1 is that an equal amount of CTL10 base oil was used instead of CTL8 base oil. Sample 5 was obtained using the same air compressor oil preparation method as in Example 1.

[0109] Comparative Example 6

[0110] The difference from Example 1 is that the weight parts of coal-based base oil, oiliness agent, and antioxidant were changed so that the weight parts of the three were 60 parts by weight, 20.2 parts by weight, and 0.3 parts by weight, respectively. Sample 6 was obtained by using the same air compressor oil preparation method as in Example 1.

[0111] The following tests were performed on all the embodiments and comparative examples described above in this application:

[0112] (1) The viscosity grade of air compressor oil was tested in accordance with GB / T 265 "Determination of Kinematic Viscosity of Petroleum Products" and GB / T 1995 "Calculation Method of Viscosity Index of Petroleum Products";

[0113] (2) The maximum non-seize load P of the air compressor oil was tested according to GB / T 3142-2019 "Determination of Lubricant Load Capacity - Four-Ball Method". B and sintering load P D Through the maximum non-seize load P B and sintering load P D Evaluate the extreme pressure properties of air compressor oils;

[0114] (3) Test the wear scar diameter WSD of the air compressor oil according to SH / T 0189 "Determination of Anti-wear Performance of Lubricating Oil" and evaluate the anti-wear performance of the air compressor oil;

[0115] (4) The rust and corrosion resistance of air compressor oil was tested according to GB / T 5096 "Petroleum Products Copper Strip Corrosion Test Method" (corrosion test conditions: 100℃±2℃, 3h). The corrosion of copper strips was observed to evaluate the rust and corrosion resistance of air compressor oil. The order of superiority and inferiority was 1A>1B>2A>2B>3A>3B.

[0116] (5) The oxidation resistance of air compressor oil was evaluated according to SH / T 0193 "Determination of Oxidation Stability of Lubricating Oils - Rotary Bomb Oxygen Method".

[0117] The test results are summarized in Tables 6 to 8. Table 6

[0118] Example 1 2 3 4 5 6 7 40 °C kinematic viscosity, mm 2 / s]]> 45.4 46.2 46.8 47.2 48.5 45.7 45.5 Viscosity index 158 154 155 156 158 158 156 Flash point (open cup), °C 262 254 255 256 258 262 262 Maximum load without card grip P B , N 647 647 647 647 490 647 618 Sintering load P D , N]] 2453 2453 2453 2453 1896 2453 2347 Wear scar diameter WSD, mm 0.58 0.62 0.68 0.69 0.72 0.58 0.60 Corrosion test 1A 1A 1A 1A 1A 1A 1A Rotating oxygen bomb, min 1550 758 822 588 512 1480 1470

[0119] Table 7

[0120] Example 8 9 10 11 12 13 14 40 °C kinematic viscosity, mm 2 / s]]> 45.6 42.5 47.9 48.2 45.6 45.8 45.8 Viscosity index 156 149 154 141 158 156 158 Flash point (open cup), °C 262 263 263 265 262 254 262 Maximum pullout load P B , N 392 647 647 647 647 647 647 Sintering load P D , N]] 1431 2453 2453 2347 2453 2543 2453 Wear scar diameter WSD, mm 0.80 0.59 0.59 0.66 0.58 0.68 0.58 Corrosion test 1A 1A 1A 1A 1B 1B 1B Rotating oxygen bomb, min 1482 1540 1520 1450 1320 1220 1422

[0121] Table 8

[0122] Comparative example 1 2 3 4 5 6 40 °C kinematic viscosity, mm 2 / s]]> 44.2 45.8 43.7 35.5 61.2 38.5 Viscosity index 125 152 153 148 155 148 Flash point (open cup), °C 235 252 253 255 264 255 Maximum load without card grip P B , N 647 392 647 647 647 392 Sintering load P D , N]] 2543 1962 2543 2543 2543 1271 Wear scar diameter WSD, mm 0.68 0.88 0.60 0.68 0.62 0.80 Corrosion test 1A 2A Pass Pass Pass Pass Rotating oxygen bomb, min 875 455 155 1280 1320 1380

[0123] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0124] (1) Comparing the test data of Examples 1 to 14 with those of Comparative Examples 1 to 6, it can be seen that the air compressor oil prepared based on CTL8 coal-based oil has a higher viscosity index and flash point, and excellent lubricity, extreme pressure properties, anti-wear properties, rust and corrosion prevention properties, and oxidation stability, resulting in superior overall performance. Compared to other ranges, limiting the weight proportions of coal-based oil, oiliness agent, and antioxidant to the range described above in this application is beneficial to improving the synergistic effect between the components, better leveraging the solubilizing effect of the oiliness agent and the antioxidant effect of the antioxidant, thereby improving the overall performance of the air compressor oil described above in this application, such as lubrication performance and oxidation stability. At the same time, it is also beneficial to reduce the preparation cost of the air compressor oil, thus facilitating its application in the field of air compressors.

[0125] (2) Comparing Example 1 and Comparative Example 1, it can be seen that CTL8 base oil has a higher viscosity index, flash point and oxidation stability than conventional base oils of the same viscosity grade. It has a better effect in preparing air compressor oil and can significantly improve the service life of air compressor oil.

[0126] (3) Comparing Example 1 and Comparative Example 2, it can be seen that the introduction of Priolube 3970 saturated polyol ester and oil-soluble polyether compound can improve the lubrication extreme pressure and anti-wear and friction reduction performance of air compressor oil.

[0127] (4) Comparing Example 1 and Comparative Example 3, it can be seen that the introduction of antioxidants can improve the antioxidant properties of air compressor oil.

[0128] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those described herein.

[0129] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air compressor oil based on coal-derived base oil, characterized by, The air compressor oil comprises, by weight parts, 63-83 parts of coal-based base oil, 8-16 parts of oiliness agent, 0.5-1.5 parts of antioxidant, 0.5-5 parts of extreme pressure anti-wear agent, 6-12 parts of friction modifier, 1-3 parts of anti-rust agent and 0.5-1.5 parts of metal deactivator; wherein the coal-based base oil is CTL8 base oil; the oiliness agent is saturated polyol ester; the antioxidant is selected from phenyl-alpha-naphthylamine, 2,6-di-tert-butyl phenol, a mixture of phenyl-alpha-naphthylamine and 2,6-di-tert-butyl-p-cresol, a mixture of phenyl-alpha-naphthylamine and 2,6-di-tert-butyl phenol, or a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butyl phenol; the extreme pressure anti-wear agent is selected from one or more of dimethyl hydrogen phosphite, dioctyl hydrogen phosphite and trilauryl phosphite; and the friction modifier is a polyether compound.

2. The coal-to-baseline-oil-based air compressor oil of claim 1, wherein, The saturated polyol ester is selected from Priolube 3970 of British Cargill Company, Synative ES TMTC of German BASF Company and Synative ES 2934 of German BASF Company.

3. The coal-to-baseline-oil-based air compressor oil according to claim 1 or 2, characterized by, The antioxidant is selected from a mixture of phenyl-alpha-naphthylamine and 2,6-di-tert-butyl-p-cresol with a weight ratio of (1-2):(2-1), a mixture of phenyl-alpha-naphthylamine and 2,6-di-tert-butyl phenol with a weight ratio of (1-2):(2-1), or a mixture of p,p'-diisooctyl diphenylamine and 2,6-di-tert-butyl phenol with a weight ratio of (1-2):(2-1).

4. The coal-to-baseline-oil-based air compressor oil of claim 1, wherein, The weight ratio of the extreme pressure anti-wear agent to the coal-based base oil is (0.012-0.048):

1.

5. The coal-to-baseline-oil-based air compressor oil of claim 1, wherein, The friction modifier is a polyalkylene glycol having an average molecular weight of 1000 to 5000 g / mol and a kinematic viscosity at 40°C of 30 to 100 mm 2 / s.

6. The coal-to-baseline-oil-based air compressor oil of claim 1, wherein, The anti-rust agent is selected from calcium sulfonate with an alkalinity of ≤400 mgKOH / g.

7. The coal-to-baseline-oil-based air compressor oil of claim 1, wherein, The anti-rust agent is selected from calcium sulfonate with a calcium content of 1.4-2.0%.

8. The coal-to-baseline-oil-based air compressor oil of claim 1, wherein, The metal deactivator is selected from methyl benzotriazole and / or dimercaptothiadiazole, by weight parts.

9. The coal-to-baseline-oil-based air compressor oil of claim 8, wherein, The air compressor oil comprises, by weight parts, 63-75 parts of the coal-based base oil, 10-16 parts of the oiliness agent, 1-1.5 parts of the antioxidant, 2-3 parts of the extreme pressure anti-wear agent, 10-12 parts of the friction modifier, 2-3 parts of the anti-rust agent and 1-1.5 parts of the metal deactivator.

10. Use of the coal-based base oil-based air compressor oil according to any one of claims 1-9 in the field of screw air compressors.

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