Environmentally friendly high-pressure piston compressor oil and preparation method thereof

Abstract

The invention relates to the technical field of high-pressure piston compressor oil, and in particular to an environmentally friendly high-pressure piston compressor oil and a preparation method thereof. The compressor oil comprises, by weight, 45-65 parts of trimethylolpropane stearate, 30-45 parts of alkylnaphthalene base oil, 1.5-5 parts of antioxidant, 0.1-3 parts of antiwear agent, 0.02-0.1 parts of non-ferrous metal corrosion inhibitor, 1.0-2.0 parts of oil mist inhibitor, 0.01-0.03 parts of defoamer, and 0.01-0.02 parts of demulsifier. The weight ratio of the trimethylolpropane stearate to the alkylnaphthalene base oil is (1-2.5):1. The compressor oil has the characteristics of high flash point, high autoignition temperature, good detergency, high safety, strong lubrication ability, long oil change cycle, user-friendly and environmentally friendly, and can maintain excellent high temperature performance even under high pressure conditions.

Description

Technical Field

[0001] The invention relates to an environmentally friendly high-pressure piston compressor oil and a preparation method thereof, belonging to the technical field of high-pressure piston compressor oil. Background Art

[0002] An air compressor is a machine that converts the power energy of a prime mover into gas pressure energy, increases the gas pressure and delivers pressurized gas. Air compressors can be divided into several types according to their structure and working mode, and high-pressure piston compressors are a relatively special type. The gas pressure after compression by a high-pressure piston compressor ranges from 20-500 bar. It is widely used in automobile and parts manufacturing, oil and gas, chemical industry, aerospace, shipping, food packaging and other industries; some special gas use areas, such as diving breathing air supply systems, fire fighting air supply systems, marine fire fighting systems, mine rescue air supply systems, medical air, hyperbaric chambers, shooting, car racing, PET bottle blowing, special chemicals, military high-pressure air supply systems, etc., are inseparable from high-pressure piston compressors.

[0003] Since many high-pressure piston compressors are used in special working environments, they require high-quality special compressor oils with high flash point, high auto-ignition temperature, good cleanliness, high safety, strong lubrication ability, long oil change cycle, user-friendly and environmentally friendly. Currently, the piston compressor oils available on the market include mineral type, PAO (polyalphaolefin), PAG (polyether), diester type, partial phenyl ester type, etc. The high-temperature performance, cleaning performance and safety of mineral products are unsatisfactory. They are prone to coking and have a short oil change period, so they can only be used in low-pressure piston compressors. The high-temperature performance of PAO piston compressor oils has been improved, but there are obvious deficiencies in coking control and biodegradability. The high-temperature volatility of polyether products is difficult to control and they are generally less used in high-pressure piston compressors. There are many types of synthetic esters. Currently, compressor oils use polyol esters, diesters, and phenyl esters. Polyol esters are mostly used in screw and centrifugal compressor oils. The biodegradability rate of phenyl esters is not good, and coking control is not ideal. The flash point and auto-ignition temperature of diester products under high-pressure environments cannot meet the special application environment. Under high-temperature, high-pressure and high-shear environments, the degradation and deterioration of oil products are accelerated. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an environmentally friendly high-pressure piston compressor oil and a preparation method thereof. The compressor oil has the characteristics of high flash point, high auto-ignition temperature, good detergency, high safety, strong lubrication ability, long oil change cycle, user-friendliness and environmental friendliness, and can maintain excellent high-temperature performance even under high-pressure working conditions.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: an environmentally friendly high-pressure piston compressor oil, the compressor oil comprising trimethylolpropane stearate, alkyl naphthalene base oil, antioxidant, antiwear agent, non-ferrous metal corrosion inhibitor, oil mist inhibitor, defoamer and demulsifier.

[0006] Furthermore, in parts by weight, the compressor oil includes 45-65 parts of trimethylolpropane stearate, 30-45 parts of alkyl naphthalene base oil, 1.5-5 parts of antioxidant, 0.1-3 parts of antiwear agent, 0.02-0.1 parts of non-ferrous metal corrosion inhibitor, 1.0-2.0 parts of oil mist suppressant, 0.01-0.03 parts of defoaming agent, and 0.01-0.02 parts of demulsifier.

[0007] Furthermore, the weight ratio of the trimethylolpropane stearate to the alkyl naphthalene base oil is (1-2.5):1; the weight ratio of the trimethylolpropane stearate to the oil mist inhibitor is (22-55):1.

[0008] Furthermore, the trimethylolpropane stearate is at least one of trimethylolpropane triisostearate, trimethylolpropane diisostearate monooleate and trimethylolpropane monoisostearate dioleate.

[0009] Furthermore, the alkyl naphthalene base oil is an alkyl naphthalene base oil with an open flash point greater than 250°C.

[0010] Furthermore, the antioxidant is at least one of a high molecular weight phenol antioxidant, an alkylated naphthylamine antioxidant, an alkylated aniline antioxidant, a phosphite antioxidant, an amine antioxidant and a mixed solution of a high molecular weight phenol antioxidant.

[0011] Furthermore, the anti-wear agent is at least one of a phosphate friction reducer, a thiophosphate friction reducer, a polymer polyester friction reducer, and a phosphate amine friction reducer;

[0012] The non-ferrous metal corrosion inhibitor is at least one of a benzotriazole corrosion inhibitor, a methylbenzotriazole corrosion inhibitor, a thiadiazole corrosion inhibitor, and a succinic acid half ester corrosion inhibitor.

[0013] Furthermore, the oil mist suppressant is a polyisobutylene polymer or a derivative thereof with a molecular weight not exceeding 1000.

[0014] Furthermore, the demulsifier is at least one of polyethylene glycol fatty acid ester and ethylene oxide-propylene oxide block copolymer;

[0015] The defoaming agent is at least one of an organic silicon defoaming agent and a non-silicon defoaming agent.

[0016] The present invention also discloses a method for preparing an environmentally friendly high-pressure piston compressor oil, the preparation method comprising:

[0017] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, oil mist inhibitor into the blending kettle, control the temperature at 40-60°C, and stir evenly;

[0018] S2, continue stirring, keep the temperature at 40-60 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0019] S3, continue stirring, keep the temperature at 40-60 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0020] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0021] The beneficial effects of the present invention are:

[0022] Based on the special operating environment of high pressure and high temperature of high pressure piston compressor and the requirement of ensuring direct and safe use by operators, the present invention develops a high-quality compressor oil for high pressure piston compressor with high flash point, high spontaneous combustion temperature, good cleanliness, high safety, strong lubrication ability, long oil change cycle, user-friendly and environmentally friendly. The compressor oil can maintain excellent high temperature performance even under high pressure conditions, provide long-term and reliable lubrication protection for piston compressors under high pressure conditions, and prevent the risk of oil spontaneous combustion and explosion under high pressure.

[0023] In the piston compressor oil of the present invention, trimethylolpropane stearate has the characteristics of good low temperature performance, strong antioxidant ability and good lubrication performance, and there is a strong hydrogen bond in the isostearic acid molecule, so that its saturated vapor pressure is very low, and the corresponding boiling point is very high. The boiling point of isostearic acid under normal pressure is above 300°C, so its high temperature performance is also very outstanding. The trimethylolpropane isostearate synthesized with isostearic acid as the main raw material has low pour point and condensation point, wide use temperature range, strong thermal stability and antioxidant ability, low evaporation loss, high viscosity index, strong viscosity-temperature characteristic, high biodegradability and the like. Alkyl naphthalene base oil has excellent thermal oxidation stability and excellent hydrolytic stability, and the stable structure of the naphthalene ring makes it not have surface competition with other additives. The characteristics of high flash point and low volatility are particularly suitable for high temperature and high pressure occasions. They can greatly reduce the possibility of oil being brought out by air under ultra-high pressure compression conditions, thereby ensuring air purity. The present invention selects trimethylolpropane stearate and alkyl naphthalene as a base oil combination. The two are used in combination to give full play to the high temperature characteristics of the two compounds, which can maximize the low volatility performance under high temperature and high pressure, and greatly improve the purity of the air. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is described in detail below. The present invention can be implemented in many other ways than 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.

[0025] 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 are not intended to limit the present invention.

[0026] The invention discloses an environmentally friendly high-pressure piston compressor oil, which comprises trimethylolpropane stearate, alkyl naphthalene base oil, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, oil mist inhibitor, defoamer and demulsifier.

[0027] Specifically, in parts by weight, the compressor oil includes 45-65 parts of trimethylolpropane stearate, 30-45 parts of alkyl naphthalene base oil, 1.5-5 parts of antioxidant, 0.1-3 parts of antiwear agent, 0.02-0.1 parts of non-ferrous metal corrosion inhibitor, 1.0-2.0 parts of oil mist suppressant, 0.01-0.03 parts of defoaming agent, and 0.01-0.02 parts of demulsifier.

[0028] Specifically, the weight ratio of the trimethylolpropane stearate to the alkyl naphthalene base oil is (1-2.5):1; under this ratio, the piston compressor oil can have high flash point, low volatility and biodegradability at the same time.

[0029] The weight ratio of the trimethylolpropane stearate to the oil mist inhibitor is (22-55):1. Under this ratio, it is more conducive to enabling the piston compressor oil to achieve a good oil mist inhibition effect under high temperature and high pressure conditions.

[0030] Specifically, the trimethylolpropane stearate is at least one of trimethylolpropane triisostearate, trimethylolpropane diisostearate monooleate and trimethylolpropane monoisostearate dioleate.

[0031] Preferably, the trimethylolpropane stearate is trimethylolpropane triisostearate.

[0032] Specifically, the alkyl naphthalene base oil is an alkyl naphthalene base oil with an open flash point greater than 250°C.

[0033] Preferably, the alkylnaphthalene base oil is selected from KR-015, KR-019, KR-023, KF-015FG, KF-029FG produced by King's Company or AN12 produced by ExxonMobil Chemical.

[0034] Specifically, the antioxidant is at least one of a high molecular weight phenol antioxidant, an alkylated naphthylamine antioxidant, an alkylated aniline antioxidant, a phosphite antioxidant, an amine antioxidant and a mixed solution of a high molecular weight phenol antioxidant.

[0035] Preferably, the antioxidant is selected from at least one of Irganox L06, Irganox L57, Irganox L67, Irganox L135, Irganox L64, Irganox L115, BHT, Irganox L168, VANLUBE961, VANLUBE 407, and VANLUBE BHC.

[0036] Specifically, the anti-wear agent is at least one of a phosphate friction reducer, a thiophosphate friction reducer, a polymer polyester friction reducer, and a phosphate amine friction reducer;

[0037] The non-ferrous metal corrosion inhibitor is at least one of a benzotriazole corrosion inhibitor, a methylbenzotriazole corrosion inhibitor, a thiadiazole corrosion inhibitor, and a succinic acid half ester corrosion inhibitor.

[0038] Preferably, the antiwear agent is selected from at least one of Irganox TPPT, Irganox 232, Irganox 349, VANLUBE 829, Synative ES 1200, Synative ES 3100, and Synative ES 3103.

[0039] Preferably, the non-ferrous metal corrosion inhibitor is selected from at least one of Irgacor L 12, Irgamet 39, Sarkosyl O, AmineO, CUVAN484, and CUVAN 826.

[0040] Specifically, the oil mist suppressant is a polyisobutylene polymer or a derivative thereof with a molecular weight not exceeding 1000.

[0041] Preferably, the oil mist suppressant is ADDTAC produced by Lubrizol Corporation.

[0042] Specifically, the demulsifier is at least one of polyethylene glycol fatty acid ester and ethylene oxide-propylene oxide block copolymer;

[0043] The defoaming agent is at least one of an organic silicon defoaming agent and a non-silicon defoaming agent.

[0044] A method for preparing an environmentally friendly high-pressure piston compressor oil, characterized in that the preparation method comprises:

[0045] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, oil mist inhibitor into the blending kettle, control the temperature at 40-60°C, and stir evenly;

[0046] S2, continue stirring, keep the temperature at 40-60 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0047] S3, continue stirring, keep the temperature at 40-60 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0048] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0049] Example 1

[0050] Piston compressor oil was prepared according to the formulation in Table 1.

[0051] Table 1 Formula composition of Example 1

[0052]

[0053] The preparation method is:

[0054] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, and oil mist inhibitor into a blending kettle, control the temperature at 40°C, and stir evenly;

[0055] S2, continue stirring, keep the temperature at 40 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0056] S3, continue stirring, keep the temperature at 40 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0057] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0058] Example 2

[0059] Piston compressor oil was prepared according to the formulation in Table 2.

[0060] Table 2 Formula composition of Example 2

[0061]

[0062] The preparation method is:

[0063] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, and oil mist inhibitor into a blending kettle, control the temperature at 60°C, and stir evenly;

[0064] S2, continue stirring, keep the temperature at 60 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0065] S3, continue stirring, keep the temperature at 60 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0066] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0067] Example 3

[0068] Piston compressor oil was prepared according to the formulation in Table 3.

[0069] Table 3 Formula composition of Example 3

[0070]

[0071] The preparation method is:

[0072] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, oil mist inhibitor into the blending kettle, control the temperature at 50°C, and stir evenly;

[0073] S2, continue stirring, keep the temperature at 50 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0074] S3, continue stirring, keep the temperature at 50 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0075] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0076] Example 4

[0077] Piston compressor oil was prepared according to the formulation in Table 4.

[0078] Table 4 Formula composition of Example 4

[0079]

[0080] The preparation method is:

[0081] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, and oil mist inhibitor into a blending kettle, control the temperature at 40°C, and stir evenly;

[0082] S2, continue stirring, keep the temperature at 40 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0083] S3, continue stirring, keep the temperature at 40 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0084] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0085] Example 5

[0086] Piston compressor oil was prepared according to the formulation in Table 5.

[0087] Table 5 Formula composition of Example 5

[0088]

[0089] The preparation method is:

[0090] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, and oil mist inhibitor into a blending kettle, control the temperature at 40°C, and stir evenly;

[0091] S2, continue stirring, keep the temperature at 40 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0092] S3, continue stirring, keep the temperature at 40 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0093] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0094] Comparative Example 1

[0095] The piston compressor oil was prepared by the same method as in Example 1, except that trimethylolpropane stearate was not added. The specific formula composition is shown in Table 6 below.

[0096] Table 6 Formula composition of comparative example 1

[0097]

[0098] The preparation method is:

[0099] S1. Add alkyl naphthalene base oil, antioxidant, antiwear agent, non-ferrous metal corrosion inhibitor, oil mist inhibitor into the blending kettle, control the temperature at 40°C, and stir evenly;

[0100] S2. Continue stirring, keep the temperature at 40°C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0101] S3. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0102] Comparative Example 2

[0103] The piston compressor oil was prepared by the same method as in Example 1, except that no alkyl naphthalene base oil was added. The specific formula composition is shown in Table 7 below.

[0104] Table 7 Formula composition of comparative example 2

[0105]

[0106] The preparation method is:

[0107] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, and oil mist inhibitor into a blending kettle, control the temperature at 40°C, and stir evenly;

[0108] S2. Continue stirring, keep the temperature at 40°C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0109] S3. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0110] Comparative Example 3

[0111] The piston compressor oil was prepared by the same method as in Example 1, except that the addition amounts of trimethylolpropane stearate and alkyl naphthalene were adjusted so that the weight ratio of trimethylolpropane stearate to alkyl naphthalene base oil was 3.5:1 (not within the scope of the present invention). The specific formula composition is shown in Table 8 below.

[0112] Table 8 Formula composition of comparative example 3

[0113]

[0114] The preparation method is:

[0115] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, and oil mist inhibitor into a blending kettle, control the temperature at 40°C, and stir evenly;

[0116] S2, continue stirring, keep the temperature at 40 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0117] S3, continue stirring, keep the temperature at 40 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0118] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0119] Comparative Example 4

[0120] The piston compressor oil was prepared by the same method as in Example 1, except that the addition amounts of trimethylolpropane stearate and alkyl naphthalene were adjusted so that the weight ratio of trimethylolpropane stearate to alkyl naphthalene base oil was 0.64:1 (not within the scope of the present invention). The specific formula composition is shown in Table 9 below.

[0121] Table 9 Formula composition of comparative example 4

[0122]

[0123] The preparation method is:

[0124] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, and oil mist inhibitor into a blending kettle, control the temperature at 40°C, and stir evenly;

[0125] S2, continue stirring, keep the temperature at 40 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0126] S3, continue stirring, keep the temperature at 40 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0127] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0128] Comparative Example 5

[0129] The piston compressor oil was prepared by the same method as in Example 1, except that the dosage ratio of trimethylolpropane stearate and the oil mist suppressant was changed so that the weight ratio of trimethylolpropane stearate and the oil mist suppressant was 60:1 (not within the formula range defined by the present invention). The specific formula composition is shown in Table 10 below.

[0130] Table 10 Formula composition of comparative example 5

[0131]

[0132] The preparation method is:

[0133] S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, and oil mist inhibitor into a blending kettle, control the temperature at 40°C, and stir evenly;

[0134] S2, continue stirring, keep the temperature at 40 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform;

[0135] S3, continue stirring, keep the temperature at 40 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform;

[0136] S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

[0137] The piston compressor oils prepared in the above examples and comparative examples were subjected to performance tests, and the specific test results are shown in Tables 11 and 12. The test methods involved are:

[0138] Kinematic viscosity: ASTM D445;

[0139] Viscosity index: ASTM D2270;

[0140] Open cup flash point: ASTM D92;

[0141] Closed cup flash point: ASTM D93;

[0142] Pour point: ASTM D97;

[0143] Demulsification: ASTM D1401;

[0144] Foam properties: ASTM D892;

[0145] Copper corrosion: ASTM D130;

[0146] Liquid phase corrosion: ASTM D665;

[0147] Maximum no-seizure load PB: ASTM D2783;

[0148] Wear spot diameter D: ASTM D4172;

[0149] Oxidation stability test: DIN 51352-1;

[0150] Rotating oxygen bomb: ASTM D2272;

[0151] Evaporation loss: refer to SH / T 0059, the test time is 1h, 3h and 10h respectively;

[0152] Coking experiment (crankcase simulation experiment method): refer to SH / T 0300, oil temperature 180℃, plate temperature 320℃, time 3h.

[0153] Table 11 Performance test data of piston compressor oil in Examples 1-5

[0154]

[0155] Table 12 Performance test data of piston compressor oil in comparative examples 1-5

[0156]

[0157] It can be seen from the above table data that the piston compressor oils prepared by the preparation method of the present invention in Examples 1-7 have high flash point, high auto-ignition temperature, good detergency, high safety, strong lubrication ability, long oil change cycle, user-friendly, and environmentally friendly characteristics, and can maintain excellent high-temperature performance even under high-pressure conditions. The compressor oil can maintain excellent high-temperature performance even under high-pressure conditions, providing long-term and reliable lubrication protection for piston compressors under high-pressure conditions, and preventing the risk of oil spontaneous combustion and explosion under high pressure.

[0158] From the data comparison of Example 1 and Comparative Example 1, it can be seen that if trimethylolpropane stearate is not added to the formula composition, the viscosity-temperature characteristics and high-temperature performance will decrease significantly, and the volatility will increase significantly, which will increase the amount of oil carried out in the compressed gas, affect the purity of the compressed gas, and have adverse effects on users and the environment.

[0159] From the comparison of the data of Example 1 and Comparative Example 2, it can be seen that if the alkyl naphthalene base oil is not added to the formula composition, the water resistance and rust resistance will be reduced, and the antioxidant and anti-coking properties will also be reduced to a certain extent, which will reduce the service life of the oil and increase the risk of equipment coking.

[0160] From the comparison of the data of Example 1 and Comparative Examples 3-4, it can be seen that if the usage ratio of alkyl naphthalene base oil to alkyl naphthalene base oil in the formula composition is not within the specified range of the present invention, various properties will be damaged to varying degrees, including viscosity-temperature characteristics, high temperature performance, volatility, water resistance, rust resistance, oxidation resistance and anti-coking performance, etc. Therefore, the combination of alkyl naphthalene and trimethylolpropane stearate in a suitable ratio is more conducive to obtaining a piston compressor oil with excellent performance.

[0161] From the comparison of the data of Example 1 and Comparative Example 5, it can be seen that if the ratio of the amount of oil mist inhibitor to the alkyl naphthalene base oil in the formula composition is not within the specified range of the present invention, it will lead to a significant increase in the amount of volatility. Therefore, the combination of oil mist inhibitor and trimethylolpropane stearate in a suitable ratio is more conducive to obtaining a piston compressor oil with excellent performance.

[0162] 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 exhaustively listed. 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.

[0163] For those skilled in the art, several modifications and improvements may be made without departing from the concept of the present invention, all of which belong to the protection scope of the present invention. The protection scope of the present invention shall be based on the attached claims.

Claims

1. An environmentally friendly high-pressure piston compressor oil, characterized in that: The compressor oil comprises trimethylolpropane stearate, alkyl naphthalene base oil, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, oil mist inhibitor, defoamer and demulsifier; According to the weight percentage, the compressor oil includes 45-65 parts of trimethylolpropane stearate, 30-45 parts of alkyl naphthalene base oil, 1.5-5 parts of antioxidant, 0.1-3 parts of anti-wear agent, 0.02-0.1 parts of non-ferrous metal corrosion inhibitor, 1.0-2.0 parts of oil mist inhibitor, 0.01-0.03 parts of defoamer, and 0.01-0.02 parts of demulsifier; The weight ratio of the trimethylolpropane stearate to the oil mist inhibitor is (22-55): 1; The oil mist suppressant is a polyisobutylene polymer or a derivative thereof with a molecular weight not exceeding 1000.

2. The environmentally friendly high-pressure piston compressor oil according to claim 1, characterized in that: The trimethylolpropane stearate is at least one of trimethylolpropane triisostearate, trimethylolpropane diisostearate monooleate and trimethylolpropane monoisostearate dioleate.

3. The environmentally friendly high-pressure piston compressor oil according to claim 1, characterized in that: The alkyl naphthalene base oil is an alkyl naphthalene base oil with an open flash point greater than 250°C.

4. The environmentally friendly high-pressure piston compressor oil according to claim 1, characterized in that: The antioxidant is at least one of a high molecular weight phenol antioxidant, an alkylated naphthylamine antioxidant, an alkylated aniline antioxidant, a phosphite antioxidant, an amine antioxidant and a mixed solution of a high molecular weight phenol antioxidant.

5. The environmentally friendly high-pressure piston compressor oil according to claim 1, characterized in that: The anti-wear agent is at least one of a phosphate friction reducer, a thiophosphate friction reducer, a polymer polyester friction reducer, and a phosphate amine friction reducer; The non-ferrous metal corrosion inhibitor is at least one of a benzotriazole corrosion inhibitor, a methylbenzotriazole corrosion inhibitor, a thiadiazole corrosion inhibitor, and a succinic acid half ester corrosion inhibitor.

6. The environmentally friendly high-pressure piston compressor oil according to claim 1, characterized in that: The demulsifier is at least one of polyethylene glycol fatty acid ester and ethylene oxide-propylene oxide block copolymer; The defoaming agent is at least one of an organic silicon defoaming agent and a non-silicon defoaming agent.

7. A method for preparing an environmentally friendly high-pressure piston compressor oil according to any one of claims 1 to 6, characterized in that: The preparation method is: S1. Add trimethylolpropane stearate, antioxidant, anti-wear agent, non-ferrous metal corrosion inhibitor, oil mist inhibitor into the blending kettle, control the temperature at 40-60°C, and stir evenly; S2, continue stirring, keep the temperature at 40-60 ° C, add alkyl naphthalene base oil, and continue stirring until the mixture is uniform; S3, continue stirring, keep the temperature at 40-60 ° C, add defoamer and demulsifier, and continue stirring until the mixture is uniform; S4. After stirring and cooling to room temperature, filtering is performed using a filter bag with a filtration pore size of no more than 5 μm to obtain the high-pressure piston compressor oil.

Images