Energy-saving and long-life air compressor oil and preparation method thereof

Abstract

The present invention relates to an energy-saving and long-life air compressor oil and a preparation method thereof, and belongs to the technical field of air compressor lubrication. The air compressor oil comprises 15-20 parts of alkyl naphthalene; 50-55 parts of a functional fluid of a low-volatility poly-alpha olefin base material; 10-15 parts of a hydrocarbon polymer fluid containing an ester functional group; 10-15 parts of an aromatic ester base oil; 2-4 parts of an antioxidant; 0.5-3 parts of an extreme pressure anti-wear agent; 0.05-0.2 parts of a corrosion inhibitor; 0.01-0.2 parts of a rust inhibitor; 0.03-0.1 parts of a demulsifier; and 0.01-0.05 parts of a defoamer. The air compressor oil has good high and low temperature performance and energy-saving effects, and can be used with one oil product to be suitable for a variety of machine models and working conditions, thereby minimizing the overall use cost, and is a long-lasting, energy-saving, and green product.

Description

Technical Field

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

[0002] An air compressor is a machine that converts the power energy of a prime mover into gas pressure energy, increases gas pressure, and delivers pressurized gas. It is a general-purpose equipment in the modern equipment manufacturing industry. Screw air compressors are an important branch of compressors and belong to positive displacement compressors. When a screw air compressor is working, air enters the main engine through the air intake filter and enters a pair of parallel meshing yin and yang rotors. The rotors mesh to cause the air in the rotor teeth to continuously change periodically to change the main engine volume, thereby achieving the process of suction, sealing, compression, and exhaust. During the compression process, the air is transmitted from the intake side to the exhaust side along the rotor axis, thereby completing the process of suction, sealing, compression, and exhaust.

[0003] Air compressors are widely used in mining, textile, metallurgy, machinery manufacturing, civil engineering, petrochemical and other industries, and are indispensable key equipment for the production and operation of many enterprises. In the energy storage field that has emerged in recent years, compressed air energy storage is also a direction that the country strongly supports.

[0004] However, the energy consumption problem of air compressors is becoming increasingly prominent. At present, air compressors are one of the key energy-consuming equipment in industrial enterprises. Energy conservation and consumption reduction of air compressors are of great significance. Air compressor manufacturers, various air compressor users and supporting service providers are also paying more and more attention to energy conservation indicators in the design, manufacturing, use and maintenance links, and reducing the energy consumption of air compressors through various means. In the hardware link of air compressors, efforts are made to reduce energy consumption indicators through variable speed drive devices, heat recovery drive systems, and increased power density; in the operation and maintenance link, new operating methods such as emerging air compressor station hosting projects and contract energy management also focus on energy conservation and consumption reduction.

[0005] In the context of energy conservation and consumption reduction in the air compressor industry, the energy conservation and consumption reduction potential of air compressor lubricants has not yet been fully explored. The oil-injected screw air compressor oils on the market include synthetic oils - PAO (polyalphaolefin), PAG (polyether), POE (synthetic ester), etc. For example, the base oils used in Chinese patent applications CN112522015A, CN112522011A, and CN111234906A are all such synthetic oils. Synthetic oils have good high temperature performance and cleaning performance, and a longer oil change period, but their energy-saving indicators are average; there are also a large number of mineral hydrocarbon oil products on the market, the main feature of which is that they are cheap, but the performance and oil change period are unsatisfactory. Summary of the invention

[0006] The present invention aims at the deficiencies in the prior art and provides an energy-saving and long-life air compressor oil and a preparation method thereof. The air compressor oil has good high and low temperature performance and energy-saving effect, and is a long-lasting, energy-saving and green product.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: an energy-saving and long-life air compressor oil, which includes, by weight, 15-20 parts of alkyl naphthalene; 50-55 parts of a functional fluid of a low-volatility poly-alpha olefin base material; 10-15 parts of a hydrocarbon polymer fluid containing an ester functional group; 10-15 parts of an aromatic ester base oil; 2-4 parts of an antioxidant; 0.5-3 parts of an extreme pressure anti-wear agent; 0.05-0.2 parts of a corrosion inhibitor; 0.01-0.2 parts of a rust inhibitor; 0.03-0.1 parts of a demulsifier; 0.01-0.05 parts of a defoaming agent;

[0008] The weight ratio of the total weight of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil to the functional fluid of the low volatility polyalphaolefin base stock is 1:(1.75-2.75).

[0009] Furthermore, the weight ratio of the functional fluid containing the low-viscosity and low-volatility poly-alpha-olefin base material to the alkyl naphthalene is (2.75-3.40):1.

[0010] Furthermore, the weight ratio of the hydrocarbon polymer fluid containing ester functional groups to the aromatic ester base oil is (0.95-1.25):1.

[0011] Further, the functional fluid containing a low-viscosity and low-volatility poly-alpha-olefin base material is oligomeric alpha-olefin MAX3.5;

[0012] The alkyl naphthalene is selected from alkyl naphthalene having a kinematic viscosity of 20-100 cst at 40°C.

[0013] Furthermore, the kinematic viscosity of the hydrocarbon polymer fluid containing ester functional groups at 40° C. is less than 10000 mm 2 / s, pour point is lower than -20℃;

[0014] The aromatic ester base oil is selected from at least one of phthalates and trimellitates.

[0015] Preferably, the hydrocarbon polymer fluid containing ester functional groups is selected from at least one of VBS 5-150, VBS 5-180, VBS 5-188, VISCOBASE11-570, VISCOBASE11-574, and VISCOBASE11-572;

[0016] The aromatic ester base oil is selected from at least one of P61, P81 and PM111.

[0017] Furthermore, the antioxidant is selected from at least one of phenolic antioxidants, amine antioxidants, phosphites, phosphite antioxidants or high molecular weight phenol and amine composite antioxidants; the function of the antioxidant is to improve the antioxidant capacity of the oil, reduce harmful deposits such as sludge and paint film, inhibit viscosity growth, and extend service life.

[0018] The extreme pressure anti-wear agent is selected from at least one of thiophosphonate, phosphate ester extreme pressure anti-wear agent, phosphate extreme pressure anti-wear agent, and amine phosphate extreme pressure anti-wear agent; the function of the extreme pressure anti-wear agent is to reduce equipment wear, improve the extreme pressure and anti-wear capabilities of the oil under low oil film coverage, and reduce equipment friction damage.

[0019] The corrosion inhibitor is selected from at least one of benzotriazole, methylbenzotriazole or their derivatives; the corrosion inhibitor protects non-ferrous metals in the equipment, including copper, aluminum and their alloys, and reduces chemical or electrochemical metal corrosion.

[0020] The rust inhibitor is at least one of organic amines, nitrogen-containing heterocyclic compounds, succinic acid half esters, liquid organic carboxylic acids, and sarcosine; the rust inhibitor functions to form a dense protective film on the metal surface to prevent equipment from rusting.

[0021] The demulsifier is an oil-soluble nonionic surfactant;

[0022] The defoaming agent is at least one of an organosilicon defoaming agent and a non-organosilicon defoaming agent.

[0023] Preferably, the defoamer is a combination of an organosilicon defoamer and a non-organosilicon defoamer. The combination of an organosilicon defoamer and a non-organosilicon defoamer is used as a defoamer in air compressor oil, which is more conducive to achieving a long-term defoaming effect, thereby facilitating the long-life use of the air compressor oil.

[0024] The present invention also discloses a method for preparing energy-saving and long-life air compressor oil, the preparation method comprising:

[0025] S1. Add functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into a blending kettle, and heat and stir evenly;

[0026] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle and mixing evenly;

[0027] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 15 μm to obtain the energy-saving and long-life air compressor oil.

[0028] The beneficial effects of the present invention are:

[0029] The air compressor oil of the present invention can be used as a single oil product to suit a variety of machine models and working conditions, thereby minimizing the overall cost of use. The air compressor oil has better high and low temperature performance and multi-level viscosity characteristics, better oil film retention and sealing capabilities in high temperature environments, good fluidity when starting at low temperatures, and avoids frequent start and stop of the air compressor; the cooling efficiency is higher, the operating temperature is reduced, and the compressor is prevented from overheating; at the same time, the air compressor oil of the present invention can maintain excellent antioxidant capacity and high-clear dispersion capacity, inhibit sludge and carbon deposition, and quickly separate water and gas. The ability of the air compressor oil to adapt to multiple machine models and multiple working conditions can improve the working efficiency of the air compressor, reduce energy consumption, extend the oil change cycle, and obtain considerable electricity savings. At the same time, due to the large amount of materials with high biodegradability used, the oil product of the present invention is a long-lasting, energy-saving, and green product.

[0030] In the air compressor oil of the present invention, alkylnaphthalene has extremely outstanding antioxidant performance, hydrolysis stability, excellent additive solubility and dispersibility. The electron-rich naphthalene ring in the alkylnaphthalene can absorb oxygen, thereby interrupting the transmission of the oxidation chain, preventing the continued oxidation of hydrocarbons, and preventing the occurrence of oxidation. The electron-rich naphthalene ring structure of the alkylnaphthalene has a strong polarity at the same time, and has good solubility and dispersibility for polar additives. The aniline point of the alkylnaphthalene is high, the polarity is weak, and the aniline point is low and the polarity is strong. The special electron-rich naphthalene ring structure of the alkylnaphthalene and the regular saturated hydrocarbon structure will form a mutual synergistic effect, which can not only give play to the high saturation and excellent high-temperature oxidation resistance of the saturated alkane structure, but also have the strong polarity and water resistance of the alkylnaphthalene. The present invention selects alkylnaphthalene and alpha olefin polymers in different polymerization forms as the base oil combination to achieve the best beneficial effect. The electron-rich naphthalene ring structure of alkyl naphthalene also has a synergistic effect with the functional fluid containing low viscosity and low volatility polyalphaolefin base materials, which can not only exert the highly saturated oxidation resistance of saturated hydrocarbons, but also have the strong polarity and water resistance of alkyl naphthalene. The synergistic effect of alkyl naphthalene and the functional fluid containing low viscosity and low volatility polyalphaolefin base materials is shown below, where R is n-butyl, n-hexyl, n-octyl, n-decyl or n-dodecyl.

[0031] .

[0032] In the air compressor oil of the present invention, the appropriate dosage ratio between the hydrocarbon polymer fluid containing ester functional groups, the aromatic ester base oil, and the functional fluid of the low-volatility poly-alpha-olefin base material can make the air compressor oil have better antioxidant performance and good sensitivity to functional additives such as antioxidants, extreme pressure anti-wear agents, corrosion inhibitors, rust inhibitors, demulsifiers, and defoamers. Therefore, the air compressor oil can achieve long service life and have higher energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the test principle diagram of MTM micro traction test machine;

[0034] Figure 2 This is the test result diagram of MTM micro traction test machine. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, 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 specific embodiments disclosed below.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] The invention discloses an energy-saving and long-life air compressor oil, which comprises, by weight, 15-20 parts of alkyl naphthalene; 50-55 parts of a functional fluid of a low-volatile poly-alpha-olefin base material; 10-15 parts of a hydrocarbon polymer fluid containing an ester functional group; 10-15 parts of an aromatic ester base oil; 2-4 parts of an antioxidant; 0.5-3 parts of an extreme pressure anti-wear agent; 0.05-0.2 parts of a corrosion inhibitor; 0.01-0.2 parts of a rust inhibitor; 0.03-0.1 parts of a demulsifier; and 0.01-0.05 parts of a defoaming agent.

[0038] Specifically, the weight ratio of the functional fluid containing the low-viscosity and low-volatility poly-alpha-olefin base material to the alkyl naphthalene is (2.75-3.40):1.

[0039] Specifically, the weight ratio of the hydrocarbon polymer fluid containing ester functional groups to the aromatic ester base oil is (0.95-1.25):1.

[0040] Specifically, the weight ratio of the total weight of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil to the functional fluid of the low volatility poly-alpha-olefin base stock is 1:(1.75-2.75).

[0041] Specifically, the functional fluid containing a low-viscosity and low-volatility poly-alpha olefin base material is oligomeric alpha olefin MAX3.5 produced by ExxonMobil Chemical;

[0042] The alkyl naphthalene is preferably an alkyl naphthalene produced by ExxonMobil Chemical, King's Chemical, and Doppler Chemical, and preferably has a kinematic viscosity of 20-100 cst at 40°C.

[0043] Specifically, the hydrocarbon polymer fluid containing ester functional groups has a kinematic viscosity of less than 10000 mm at 40°C. 2 / s, pour point is lower than -20℃;

[0044] The aromatic ester base oil is selected from at least one of phthalates and trimellitates.

[0045] Specifically, the hydrocarbon polymer fluid containing ester functional groups is selected from at least one of VBS 5-150, VBS 5-180, VBS 5-188, VISCOBASE11-570, VISCOBASE11-574, and VISCOBASE11-572;

[0046] The aromatic ester base oil is selected from at least one of P61, P81 and PM111.

[0047] Specifically, the antioxidant is selected from at least one of phenolic antioxidants, amine antioxidants, phosphites, phosphite antioxidants, or high molecular weight phenol and amine composite antioxidants;

[0048] The extreme pressure anti-wear agent is selected from at least one of a phosphate ester extreme pressure anti-wear agent, a phosphate extreme pressure anti-wear agent, and a phosphate amine extreme pressure anti-wear agent;

[0049] The corrosion inhibitor is selected from at least one of benzotriazole, methylbenzotriazole or their derivatives;

[0050] The rust inhibitor is at least one of an organic amine, a nitrogen-containing heterocyclic compound, a succinic acid half ester, a liquid organic carboxylic acid, and sarcosine;

[0051] The demulsifier is an oil-soluble nonionic surfactant;

[0052] The defoaming agent is at least one of an organosilicon defoaming agent and a non-organosilicon defoaming agent.

[0053] Specifically, the defoaming agent is a combination of an organosilicon defoaming agent and a non-organosilicon defoaming agent.

[0054] More specifically, in an embodiment of the present invention, the antioxidant is at least one of Irganox L 64, Irganox L 135, L 57, L115, and L06.

[0055] The extreme pressure anti-wear agent is at least one of Durad 150B, Irgalube TPPT, Irgalube232, Irgalube 349, and Additin RC3760.

[0056] The corrosion inhibitor is at least one of CUVAN 303, CUVAN 826, and Irgamet39;

[0057] The rust inhibitor is at least one of Sarkosyl O and Amine O;

[0058] The demulsifier is at least one of LZ5957 and PE10100;

[0059] The defoaming agent is a combination of dimethyl silicone oil and polyacrylate.

[0060] A method for preparing energy-saving and long-life air compressor oil, characterized in that the preparation method comprises:

[0061] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, stir and heat at a speed of 60-100 r / min, heat to 40-60° C., and stir for 1-2 hours;

[0062] S2. Add antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintain the temperature at 40-60°C and the stirring speed at 60-100 r / min, and stir for 1-2 hours;

[0063] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm to obtain the energy-saving and long-life air compressor oil.

[0064] Example 1

[0065] The formula composition of the energy-saving and long-life air compressor oil in this embodiment is shown in Table 1 below.

[0066] Table 1 Formula composition of Example 1

[0067]

[0068] The method for preparing the energy-saving and long-life air compressor oil comprises the following steps:

[0069] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0070] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0071] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0072] Example 2

[0073] The formula composition of the energy-saving and long-life air compressor oil in this embodiment is shown in Table 2 below.

[0074] Table 2 Formula composition of Example 2

[0075]

[0076] The method for preparing the energy-saving and long-life air compressor oil comprises the following steps:

[0077] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 2h;

[0078] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0079] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0080] Example 3

[0081] The formula composition of the energy-saving and long-life air compressor oil in this embodiment is shown in Table 3 below.

[0082] Table 3 Formula composition of Example 3

[0083]

[0084] The method for preparing the energy-saving and long-life air compressor oil comprises the following steps:

[0085] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 2h;

[0086] S2. Add antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintain the temperature at 45°C and the stirring speed at 100 r / min, and stir for 2 hours;

[0087] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0088] Example 4

[0089] The formula composition of the energy-saving and long-life air compressor oil in this embodiment is shown in Table 4 below.

[0090] Table 4 Formula composition of Example 4

[0091]

[0092] The method for preparing the energy-saving and long-life air compressor oil comprises the following steps:

[0093] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0094] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0095] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0096] Example 5

[0097] The formula composition of the energy-saving and long-life air compressor oil in this embodiment is shown in Table 5 below.

[0098] Table 5 Formula composition of Example 5

[0099]

[0100] The method for preparing the energy-saving and long-life air compressor oil comprises the following steps:

[0101] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0102] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0103] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0104] Example 6

[0105] The formula composition of the energy-saving and long-life air compressor oil in this embodiment is shown in Table 6 below.

[0106] Table 6 Formula composition of Example 6

[0107]

[0108] The method for preparing the energy-saving and long-life air compressor oil comprises the following steps:

[0109] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0110] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0111] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0112] Comparative Example 1

[0113] The same method as in Example 1 was used to prepare air compressor oil, except that no alkyl naphthalene was added. The formulation composition is shown in Table 7 below.

[0114] Table 7 Formula composition of comparative example 1

[0115]

[0116] The method for preparing the air compressor oil comprises the following steps:

[0117] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0118] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0119] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0120] Comparative Example 2

[0121] Air compressor oil was prepared by the same method as in Example 1, except that no functional fluid containing a low-viscosity, low-volatility poly-alpha-olefin base material was added. The formulation composition is shown in Table 8 below.

[0122] Table 8 Formula composition of comparative example 2

[0123]

[0124] The method for preparing the air compressor oil comprises the following steps:

[0125] S1. Add alkylnaphthalene, hydrocarbon polymer fluid containing ester functional group and aromatic ester base oil into a blending kettle, stir and heat at a speed of 100 r / min, heat to 45°C and stir for 1 hour;

[0126] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0127] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0128] Comparative Example 3

[0129] The air compressor oil was prepared by the same method as in Example 1, except that no hydrocarbon polymer fluid containing ester functional groups was added. The formulation composition is shown in Table 9 below.

[0130] Table 9 Formula composition of comparative example 3

[0131]

[0132] The method for preparing the air compressor oil comprises the following steps:

[0133] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, and aromatic ester base oil into the blending kettle, stir and heat at a speed of 100 r / min, heat to 45° C., and stir for 1 hour;

[0134] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0135] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0136] Comparative Example 4

[0137] The air compressor oil was prepared by the same method as in Example 1, except that no aromatic ester base oil was added. The formulation composition is shown in Table 10 below.

[0138] Table 10 Formula composition of comparative example 4

[0139]

[0140] The method for preparing the air compressor oil comprises the following steps:

[0141] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, and hydrocarbon polymer fluid containing ester functional group into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0142] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0143] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0144] Comparative Example 5

[0145] Air compressor oil was prepared by the same method as in Example 1, except that the dosage ratio of alkyl naphthalene and the functional fluid containing a low-viscosity, low-volatility poly-alpha olefin base stock was adjusted so that the weight ratio of the functional fluid containing a low-viscosity, low-volatility poly-alpha olefin base stock to the alkyl naphthalene was 4.23:1 (not within the ratio range defined in the present invention). The formulation composition is shown in Table 11.

[0146] Table 11 Formula composition of comparative example 5

[0147]

[0148] The method for preparing the air compressor oil comprises the following steps:

[0149] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0150] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0151] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0152] Comparative Example 6

[0153] The air compressor oil was prepared by the same method as in Example 1, except that the weight ratio of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil was adjusted so that the weight ratio of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil was 0.67:1 (not within the ratio range defined in the present invention). The formula composition is shown in Table 12.

[0154] Table 12 Formula composition of comparative example 6

[0155]

[0156] The method for preparing the air compressor oil comprises the following steps:

[0157] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0158] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0159] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0160] Comparative Example 7

[0161] The air compressor oil was prepared by the same method as in Example 1, except that the weight ratio of the total weight of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil to the functional fluid of the low volatility poly-alpha olefin base stock was adjusted. In this comparative example 7, the weight ratio of the total weight of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil to the functional fluid of the low volatility poly-alpha olefin base stock was 1.5:1, and the formula composition was as shown in Table 13.

[0162] Table 13 Formula composition of comparative example 7

[0163]

[0164] The method for preparing the air compressor oil comprises the following steps:

[0165] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0166] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0167] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0168] Comparative Example 8

[0169] The air compressor oil was prepared by the same method as in Example 1, except that the weight ratio of the total weight of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil to the functional fluid of the low volatility poly-alpha olefin base stock was adjusted. In this comparative example 8, the weight ratio of the total weight of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil to the functional fluid of the low volatility poly-alpha olefin base stock was 4:1, and the formulation composition was as shown in Table 14.

[0170] Table 14 Formula composition of comparative example 8

[0171]

[0172] The method for preparing the air compressor oil comprises the following steps:

[0173] S1. Add the functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into the blending kettle, raise the temperature while stirring, the stirring speed is 100r / min, raise the temperature to 45°C, and stir for 1h;

[0174] S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle, maintaining the temperature at 45°C and the stirring speed at 100 r / min, and stirring for 1 hour;

[0175] S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm at a pressure of 0.2 MPa to obtain the energy-saving and long-life air compressor oil.

[0176] The performance tests were conducted on the air compressor oils prepared in the above examples and comparative examples, and the specific test results are shown in Tables 15 and 16. The test methods involved are:

[0177] Kinematic viscosity: ASTM D445;

[0178] Viscosity index: ASTM D2270;

[0179] Open cup flash point: ASTM D92;

[0180] Closed cup flash point: ASTM D93;

[0181] Pour point: ASTM D97;

[0182] Demulsification: ASTM D1401;

[0183] Foam properties: ASTM D892;

[0184] Copper corrosion: ASTM D130;

[0185] Liquid phase corrosion: ASTM D665;

[0186] Maximum no-seizure load: ASTM D2783;

[0187] Wear spot diameter D: ASTM D4172;

[0188] Brookfield viscosity: ASTM D2983;

[0189] Oxidation stability test: DIN 51352-1;

[0190] Rotating oxygen bomb: ASTM D2272.

[0191] Energy saving effect test method: The traction coefficient of air compressor oil is tested using the MTM micro traction tester produced by PCS in the UK. The test principle diagram of the MTM micro traction tester is as follows: Figure 1As shown in the figure, the specific process is: put the oil to be tested into a steel pan, control the temperature of the oil through a heating element, and let the steel ball roll in the oil. During the test, the traction coefficient under different slide-roll ratio conditions at a certain temperature (80°C) is determined by changing the computer program, and a traction coefficient-slide-roll ratio curve is formed.

[0192] Table 15 Performance test data of air compressor oil in Examples 1-6

[0193]

[0194] Table 16 Performance test data of air compressor oil in comparative examples 1-8

[0195]

[0196] It can be seen from the above table data that the air compressor oil prepared by the preparation method of the present invention in Examples 1-6 has better high and low temperature performance and multi-level viscosity characteristics, better high temperature oil film retention ability and anti-wear ability, better low temperature fluidity, and more excellent antioxidant ability, anti-corrosion and anti-rust performance. In addition, it can be seen from the data comparison of Example 1 and Examples 5-6 that when the defoaming agent is a combination of an organosilicon defoaming agent and a non-silicon defoaming agent, it is more conducive to foam control during the operation of the air compressor and is conducive to oil and gas separation.

[0197] From the comparison of the data of Example 1 and Comparative Example 1, it can be seen that if alkyl naphthalene is not added to the formulation, the anti-emulsification performance, anti-corrosion performance, anti-wear ability and high and low temperature performance of the oil product are all reduced.

[0198] From the comparison of the data of Example 1 and Comparative Example 2, it can be seen that if the functional fluid containing a low-viscosity and low-volatility poly-alpha-olefin base material is not added to the formula composition, the anti-emulsification performance, anti-corrosion performance, anti-wear ability and high and low temperature performance of the oil product will all decrease, and the antioxidant performance and low-temperature flow performance will decrease particularly significantly.

[0199] From the comparison of the data of Example 1 and Comparative Example 3, it can be seen that if the hydrocarbon polymer fluid containing ester functional groups is not added to the formula composition, the anti-emulsification performance, anti-corrosion performance, anti-wear ability and high and low temperature performance of the oil product will all decrease, and the decrease in anti-wear ability will be particularly obvious.

[0200] From the comparison of the data of Example 1 and Comparative Example 4, it can be seen that if the aromatic ester base oil is not added to the formula composition, the anti-emulsification performance, anti-corrosion performance, anti-wear ability and high and low temperature performance of the oil product are all reduced.

[0201] From the comparison of the data of Example 1 and Comparative Example 5, it can be seen that if the usage ratio of alkyl naphthalene and the functional fluid containing a low-viscosity and low-volatility poly-alpha olefin base material is not within the range defined by the present invention, the anti-emulsification performance, anti-corrosion performance, anti-wear ability and high and low temperature performance of the oil product will all decrease, because the change in the usage ratio of alkyl naphthalene and the functional fluid containing a low-viscosity and low-volatility poly-alpha olefin base material will affect the synergistic effect between the two. Therefore, adopting the usage ratio defined by the present invention is more conducive to obtaining an air compressor oil with excellent comprehensive performance.

[0202] From the comparison of the data of Example 1 and Comparative Example 6, it can be seen that if the usage ratio of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil is not within the range defined by the present invention, the anti-emulsification performance, anti-corrosion performance, anti-wear ability and high and low temperature performance of the oil product will all decrease, because the change in the usage ratio of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil will affect the synergistic effect between the two. Therefore, adopting the usage ratio defined by the present invention is more conducive to obtaining an air compressor oil with excellent comprehensive performance.

[0203] From the comparison of the data of Example 1 and Comparative Examples 7-8, it can be seen that if the total weight of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil and the functional fluid of the low volatility poly-alpha olefin base stock are not in the range defined by the present invention, the anti-emulsification performance, anti-corrosion performance, anti-wear ability and high and low temperature performance of the oil product are reduced, because the change in the total weight of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil and the functional fluid of the low volatility poly-alpha olefin base stock will affect the synergistic effect between the ester group and the hydrocarbon structure. Therefore, the use of the dosage ratio defined by the present invention is more conducive to obtaining an air compressor oil with excellent comprehensive performance.

[0204] In addition, the present invention uses the MTM micro traction tester produced by PCS in the UK to test the traction coefficients of Example 1 and Comparative Examples 1, 2, 4 and 6. The test principle diagram of the MTM micro traction tester is as follows: Figure 1 As shown in the figure, the specific process is: put the oil to be tested into a steel pan, control the temperature of the oil through a heating element, and let the steel ball roll in the oil. During the test, the traction coefficient under different slide-roll ratio conditions at a certain temperature (80°C) is determined by changing the computer program, and a traction coefficient-slide-roll ratio curve is formed.

[0205] Specific test results are as follows Figure 2 As shown by Figure 2 It can be seen that Example 1 of the lubricating oil of the present invention has the lowest traction coefficient and can provide the best energy efficiency. Compared with Comparative Example 2, the traction coefficient of Example 1 decreases by more than 40%, which can provide an improvement of more than 40% in energy efficiency.

[0206] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0207] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An energy-saving and long-life air compressor oil, characterized in that: The air compressor oil is composed of the following components by weight: 15-20 parts of alkyl naphthalene; 50-55 parts of low volatility polyalphaolefin based functional fluid; 10-15 parts of hydrocarbon polymer fluid containing ester functional group; 10-15 parts of aromatic ester base oil; 2-4 parts of antioxidant; 0.5-3 parts of extreme pressure anti-wear agent; 0.05-0.2 parts of corrosion inhibitor; 0.01-0.2 parts of rust inhibitor; 0.03-0.1 parts of demulsifier; 0.01-0.05 parts of defoamer; The weight ratio of the total weight of the hydrocarbon polymer fluid containing ester functional groups and the aromatic ester base oil to the functional fluid of the low volatility polyalphaolefin base stock is 1:(1.75-2.75); The weight ratio of the functional fluid of the low volatility polyalphaolefin base material and the alkyl naphthalene is (2.75-3.40): 1; The weight ratio of the hydrocarbon polymer fluid containing ester functional groups to the aromatic ester base oil is (0.95-1.25): 1; The functional fluid of the low volatility polyalphaolefin base stock is oligomeric alphaolefin MAX3.

5.

2. The energy-saving and long-life air compressor oil according to claim 1, characterized in that: The alkyl naphthalene is selected from alkyl naphthalene having a kinematic viscosity of 20-100 cst at 40°C.

3. The energy-saving and long-life air compressor oil according to claim 1, characterized in that: The kinematic viscosity of the hydrocarbon polymer fluid containing ester functional groups at 40° C. is less than 10,000 mm 2 / s, pour point is lower than -20℃; The aromatic ester base oil is selected from at least one of phthalates and trimellitates.

4. The energy-saving and long-life air compressor oil according to claim 3, characterized in that: The hydrocarbon polymer fluid containing ester functional groups is selected from at least one of VBS 5-150, VBS 5-180, VBS 5-188, VISCOBASE11-570, VISCOBASE11-574, VISCOBASE11-572, and VISCOBASE8-219; The aromatic ester base oil is selected from at least one of P61 and P81.

5. The energy-saving and long-life air compressor oil according to claim 1, characterized in that: The antioxidant is selected from at least one of phenolic antioxidants, amine antioxidants, phosphites, phosphite antioxidants, or high molecular weight phenol and amine composite antioxidants; The extreme pressure anti-wear agent is selected from at least one of thiophosphonate, phosphate ester extreme pressure anti-wear agent, phosphate extreme pressure anti-wear agent, and amine phosphate extreme pressure anti-wear agent; The corrosion inhibitor is selected from at least one of benzotriazole, methylbenzotriazole or their derivatives; The rust inhibitor is at least one of an organic amine, a nitrogen-containing heterocyclic compound, a succinic acid half ester, a liquid organic carboxylic acid, and sarcosine; The demulsifier is an oil-soluble nonionic surfactant; The defoaming agent is at least one of an organosilicon defoaming agent and a non-organosilicon defoaming agent.

6. The energy-saving and long-life air compressor oil according to claim 5, characterized in that: The defoamer is a combination of an organosilicon defoamer and a non-organosilicon defoamer.

7. A method for preparing an energy-saving and long-life air compressor oil according to any one of claims 1 to 6, characterized in that: The preparation method is: S1. Add functional fluid containing low-viscosity and low-volatility poly-alpha-olefin base material, alkyl naphthalene, hydrocarbon polymer fluid containing ester functional group, and aromatic ester base oil into a blending kettle, and heat and stir evenly; S2, adding antioxidant, extreme pressure anti-wear agent, corrosion inhibitor, rust inhibitor, demulsifier and defoamer into the blending kettle and mixing evenly; S3. After the blending is completed, the oil is filtered using a filter bag with a filter diameter not greater than 5 μm to obtain the energy-saving and long-life air compressor oil.

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