A kind of hydrocarbon gas compressor lubricating oil and its preparation method and application

Abstract

The present invention provides a hydrocarbon gas compressor lubricating oil and a preparation method and application thereof, belonging to the technical field of hydrocarbon gas compressor lubrication. The hydrocarbon gas compressor lubricating oil provided by the present invention comprises a base material and an anti-foaming agent, wherein the mass of the anti-foaming agent is 0.001-0.02% of the mass of the base material; the base material comprises the following components in percentage by mass: 88.0-96.1% of water-soluble polyalkylene glycol, 3.0-10.0% of synthetic ester base oil, 0.5-1.0% of antioxidant, 0.05-0.1% of metal passivator, 0.3-0.8% of extreme pressure anti-wear agent, and 0.05-0.1% of rust inhibitor. The hydrocarbon gas compressor lubricating oil provided by the present invention has excellent resistance to hydrocarbon dilution, excellent antioxidant performance, improved sealing material compatibility and additive solubility, and excellent extreme pressure anti-wear performance.

Description

Technical Field

[0001] The invention relates to the technical field of hydrocarbon gas compressor lubrication, and in particular to a hydrocarbon gas compressor lubricating oil and a preparation method and application thereof. Background Art

[0002] In refineries, oil and gas fields, coking plants, mines and other fields, the pressurized transportation, bottling and separation and recovery of hydrocarbon gases such as natural gas, methane, liquefied propane, ethylene and butadiene need to be achieved through gas compressors. Compressor lubricants provide reliable lubrication, cooling, friction reduction and wear reduction for hydrocarbon gas compressors.

[0003] During the operation of the compressor, the lubricating oil in the compressor is mixed and compressed with hydrocarbon gas at 60-80℃ for a long time, the temperature rises to 85-95℃, the pressure rises to 0.8-1.1MPa, and then enters the oil-gas separator for separation and cooling. Since hydrocarbon gas contains more heavy hydrocarbon compounds, especially when the device is urgently emptied, it is more likely to contain condensed oil, water, etc. These water, condensed oil, and especially heavy hydrocarbon compounds are easily soluble in ordinary mineral lubricating oil, causing the viscosity and flash point of the lubricating oil to drop rapidly. Due to the low viscosity of the lubricating oil, the internal lubrication condition of the compressor deteriorates, which directly leads to various faults of the compressor; poor lubrication condition will also cause serious wear of components such as the male and female screws and the oil supply gear pump.

[0004] In order to solve the problem of hydrocarbon gas compressor lubricating oil being diluted by hydrocarbon gas, domestic and foreign researchers have conducted relevant research reports, but there are still some shortcomings. For example, patent CN201510659138.7 discloses a gas-powered natural gas compressor lubricating oil, including 10 to 30 parts of high-viscosity paraffin-based mineral oil base oil, 40 to 63 parts of low-viscosity paraffin-based mineral oil base oil, 6 to 12 parts of gas engine oil composite additives, 0.2 to 0.5 parts of pour point depressant, 0.001 to 0.005 parts of antifoaming agent, 17 to 27 parts of balance promoter (including 35 to 55 parts of ether synthetic oil, 15 to 35 parts of ester synthetic oil, and hydroisomerized mineral oil). Oil 10-30 parts, amine antioxidant 0.5-8.0 parts, aminothioester 0.1-3.6 parts), nano friction modifier 0.1-0.6 parts. This patent uses a lubricating oil to achieve universal lubrication of gas engines and compressors, improves mechanical conversion efficiency and reduces power consumption. However, since the mineral oil content in the lubricating oil exceeds 50%, it is still easy to absorb dissolved hydrocarbon gases during use, causing the viscosity and flash point of the lubricating oil to drop rapidly, thereby greatly shortening the oil change cycle. Patent CN201910972678.9 discloses a compressor lubricating oil, including polyalkylene glycol, antioxidant and corrosion inhibitor. The lubricating oil provides good lubrication, sealing, cooling and other functions for hydrocarbon gas compressors. It also has excellent resistance to hydrocarbon dilution, which can effectively prevent the problem of poor lubrication of the compressor caused by excessive viscosity drop, but the extreme pressure and anti-wear properties of the lubricant still need to be improved. Summary of the invention

[0005] The purpose of the present invention is to provide a hydrocarbon gas compressor lubricating oil and a preparation method and application thereof. The hydrocarbon gas compressor lubricating oil provided by the present invention has excellent resistance to hydrocarbon dilution, excellent antioxidant performance, improved sealing material compatibility and additive solubility, and excellent extreme pressure and wear resistance.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a hydrocarbon gas compressor lubricating oil, comprising a base material and an antifoaming agent, wherein the mass of the antifoaming agent is 0.001 to 0.02% of the mass of the base material;

[0008] The matrix material includes the following components in percentage by mass:

[0009] Water-soluble polyalkylene glycol 88.0-96.1%, synthetic ester base oil 3.0-10.0%, antioxidant 0.5-1.0%, metal passivator 0.05-0.1%, extreme pressure anti-wear agent 0.3-0.8%, rust inhibitor 0.05-0.1%;

[0010] The antioxidant is 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate and 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid alkyl ester.

[0011] Preferably, the mass ratio of the 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate to the 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate is 1 to 3:1.

[0012] Preferably, the water-soluble polyalkylene glycol comprises at least two of synthetic oil SDM-02C, synthetic oil SDM-03C and synthetic oil SDM-08D; the kinematic viscosity of the water-soluble polyalkylene glycol at 40°C is 40 to 2200 mm 2 / s.

[0013] Preferably, the synthetic ester base oil is a saturated neopentyl polyol ester; the kinematic viscosity of the synthetic ester base oil at 40°C is 10 to 100 mm 2 / s.

[0014] Preferably, the extreme pressure anti-wear agent is a condensation product of didodecyl phosphate octylamine salt and 2,5-dimercaptothiadiazole n-octylamine, and the mass ratio of the didodecyl phosphate octylamine salt to the condensation product of 2,5-dimercaptothiadiazole n-octylamine is 1 to 3:1.

[0015] Preferably, the metal deactivator is a benzotriazole derivative.

[0016] Preferably, the rust inhibitor is heptadecenyl imidazoline succinate.

[0017] Preferably, the antifoaming agent is a silicon-based antifoaming agent or a non-silicon-based antifoaming agent.

[0018] The present invention provides a method for preparing the hydrocarbon gas compressor lubricating oil according to the above technical solution, comprising the following steps:

[0019] The hydrocarbon gas compressor lubricating oil is obtained by mixing water-soluble polyalkylene glycol, synthetic ester base oil, antioxidant, metal passivator, extreme pressure anti-wear agent, rust inhibitor and anti-foaming agent.

[0020] The present invention provides the use of the hydrocarbon gas compressor lubricating oil described in the above technical solution or the hydrocarbon gas compressor lubricating oil prepared by the preparation method described in the above technical solution in the lubrication of hydrocarbon gas compressors.

[0021] The invention provides a hydrocarbon gas compressor lubricating oil, comprising a base material and an antifoaming agent, wherein the mass of the antifoaming agent is 0.001-0.02% of the mass of the base material; the base material comprises the following components in percentage by mass: 88.0-96.1% of water-soluble polyalkylene glycol, 3.0-10.0% of synthetic ester base oil, 0.5-1.0% of antioxidant, 0.05-0.1% of metal passivator, 0.3-0.8% of extreme pressure antiwear agent, and 0.05-0.1% of rust inhibitor; the antioxidant is 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate and 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate. The present invention adopts water-soluble polyalkylene glycol and synthetic ester base oil as base oil components, wherein the water-soluble polyalkylene glycol enables the lubricating oil to have excellent resistance to hydrocarbon dilution, effectively preventing the excessive decrease in viscosity from causing poor lubrication of the compressor, and while making full use of the excellent viscosity-temperature performance and tribological performance of the water-soluble polyalkylene glycol, the disadvantages of poor compatibility of sealing materials and poor solubility in other additives when the water-soluble polyalkylene glycol is used alone are improved by introducing the synthetic ester base oil, so that the base oil component maintains good comprehensive performance. The present invention adopts 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate and 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid alkyl ester as antioxidants, and the two have good positive synergistic effects. Compared with the commonly used antioxidants in traditional lubricating oils (such as T501), the anti-oxidation performance of the lubricating oil can be greatly improved, the lubricating oil can be prevented from premature oxidation and decay, and the oil change cycle and service life can be extended. The present invention introduces multiple functional additives such as antioxidants, metal passivators, extreme pressure anti-wear agents, rust inhibitors and anti-foaming agents, and by controlling the ratio of each additive, the lubricating oil has excellent antioxidant and low temperature performance, as well as excellent extreme pressure anti-wear performance, anti-foaming performance and rubber compatibility. DETAILED DESCRIPTION

[0022] The present invention provides a hydrocarbon gas compressor lubricating oil, comprising a base material and an antifoaming agent, wherein the mass of the antifoaming agent is 0.001 to 0.02% of the mass of the base material;

[0023] The matrix material includes the following components in percentage by mass:

[0024] Water-soluble polyalkylene glycol 88.0-96.1%, synthetic ester base oil 3.0-10.0%, antioxidant 0.5-1.0%, metal passivator 0.05-0.1%, extreme pressure anti-wear agent 0.3-0.8%, rust inhibitor 0.05-0.1%;

[0025] The antioxidant is 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate and 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid alkyl ester.

[0026] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art or are prepared by methods well known to those skilled in the art.

[0027] The hydrocarbon gas compressor lubricant provided by the present invention comprises a base material and an antifoaming agent; in terms of mass percentage, the base material in the hydrocarbon gas compressor lubricant of the present invention comprises 88.0 to 96.1% of water-soluble polyalkylene glycol (PAG), preferably 91.0 to 95.0%, and more preferably 92.0 to 93.5%. In the present invention, the kinematic viscosity of the water-soluble polyalkylene glycol at 40°C is preferably 40 to 2200 mm 2 / s, more preferably 50 to 1500 mm 2 / s, more preferably 60 to 1150 mm 2 / s, more preferably 68.45 to 1100 mm 2 / s, and more preferably 75 to 1050 mm 2 / s, and further preferably 99.08 to 1042 mm 2 / s. In the present invention, the raw materials for preparing the water-soluble polyalkylene glycol preferably include ethylene oxide and propylene oxide, and the molar ratio of ethylene oxide to propylene oxide is preferably 50-70:30-50. In the present invention, the water-soluble polyalkylene glycol preferably includes at least two of synthetic oil SDM-02C, synthetic oil SDM-03C and synthetic oil SDM-08D, specifically, it can be synthetic oil SDM-02C and synthetic oil SDM-03C, or it can be synthetic oil SDM-03C and synthetic oil SDM-08D; when the water-soluble polyalkylene glycol is synthetic oil SDM-02C and synthetic oil SDM-03C, the synthetic oil SDM-02C and synthetic oil SDM-03C The mass ratio of is preferably 1: 0.1 to 2.3, more preferably 1: 0.5 to 1.5, and further preferably 1: 0.8 to 1.0; when the water-soluble polyalkylene glycol is synthetic oil SDM-03C and synthetic oil SDM-08D, the mass ratio of synthetic oil SDM-03C to synthetic oil SDM-08D is preferably 1: 0.03 to 4.0, more preferably 1: 0.05 to 3.5, further preferably 1: 0.1 to 2.0, and further preferably 1: 0.2 to 0.7. In an embodiment of the present invention, the synthetic oil SDM-02C, synthetic oil SDM-03C and synthetic oil SDM-08D are purchased from Nanjing Will Chemical Co., Ltd. Mineral base oils, synthetic hydrocarbons, synthetic esters and other base oils have poor resistance to hydrocarbon dilution, and have strong solubility in hydrocarbon gas components. Therefore, when they are used as base oil components of hydrocarbon gas compressor lubricants, the dissolution of hydrocarbon gas heavy components during use will cause the kinematic viscosity and flash point of the compressor lubricant to drop rapidly, thereby reducing safety and causing lubrication failure. In the present invention, water-soluble polyalkylene glycol is used as the main body of the base oil component. Due to the particularity of its molecular structure, it has extremely low solubility in hydrocarbon gas heavy components and has very good resistance to hydrocarbon dilution. Therefore, the kinematic viscosity and flash point of the hydrocarbon gas compressor lubricant provided by the present invention change little during use, and can maintain a stable lubrication effect and high safety.

[0028] In terms of mass percentage, the matrix material in the hydrocarbon gas compressor lubricant of the present invention comprises 3.0-10.0% of synthetic ester base oil, preferably 4.0-8.0%, more preferably 5.0-6.0%. In the present invention, the kinematic viscosity of the synthetic ester base oil at 40°C is preferably 10-100 mm 2 / s, more preferably 15 to 50 mm 2 / s, more preferably 20 to 30 mm 2 / s. In the present invention, the synthetic ester base oil is preferably a saturated neopentyl polyol ester; the saturated neopentyl polyol ester is preferably a synthetic ester Priolube 3970; in the embodiment of the present invention, the synthetic ester Priolube 3970 is purchased from Croda. The present invention uses water-soluble polyalkylene glycol and synthetic ester base oil as base oil components, while fully utilizing the excellent viscosity-temperature performance and tribological properties of water-soluble polyalkylene glycol, while improving the disadvantages of poor compatibility of sealing materials and poor solubility in other additives when using water-soluble polyalkylene glycol alone, so that the base oil component maintains good comprehensive performance.

[0029] In terms of mass percentage, the base material in the hydrocarbon gas compressor lubricant of the present invention includes 0.5-1.0% antioxidant, preferably 0.6-0.9%, and more preferably 0.7-0.8%. In the present invention, the antioxidant is 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate and 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid alkyl ester, and the mass ratio of the 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate to the 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid alkyl ester is preferably 1-3:1, and more preferably 1.5-2:1. In the present invention, the 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid alkyl ester is preferably Irganox L135 of Basf Company. The present invention does not specifically limit the source of the 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate, and can be prepared by a method well known to those skilled in the art, and can be prepared by referring to the method in Chinese patent CN200910117591.X (An antioxidant ionic liquid containing sterically hindered phenols, preparation method and application thereof). The present invention uses 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate and 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate as an antioxidant, which can improve the antioxidant performance of hydrocarbon gas compressor lubricating oil and prevent premature oxidation and decay.

[0030] In terms of mass percentage, the base material in the hydrocarbon gas compressor lubricant of the present invention includes 0.05-0.1% of the metal passivator, preferably 0.06-0.09%, and more preferably 0.07-0.08%. In the present invention, the metal passivator is preferably a benzotriazole derivative, and the benzotriazole derivative is preferably N,N-dibutylaminomethylmethylenebenzotriazole. In the present invention, the N,N-dibutylaminomethylmethylenebenzotriazole is preferably T551 of Changsha Wangcheng Petrochemical Co., Ltd. The present invention preferably uses a benzotriazole derivative as a metal passivator, which can improve the anti-corrosion protection performance of hydrocarbon gas compressors.

[0031] In terms of mass percentage, the base material in the hydrocarbon gas compressor lubricant of the present invention includes 0.3-0.8% of extreme pressure anti-wear agent, preferably 0.4-0.7%, and more preferably 0.5-0.6%. In the present invention, the extreme pressure anti-wear agent is preferably a condensate of didodecyl phosphate octylamine salt and 2,5-dimercaptothiadiazole n-octylamine, and the mass ratio of the didodecyl phosphate octylamine salt to the 2,5-dimercaptothiadiazole n-octylamine condensate is preferably 1-3:1, and more preferably 1.5-2:1. In the present invention, the didodecyl phosphate octylamine salt is preferably prepared by amination reaction of didodecyl phosphate and n-octylamine; the molar ratio of didodecyl phosphate to n-octylamine is preferably 1:1, the temperature of the amination reaction is preferably 60-90°C, and more preferably 80°C; the time is preferably 1-3h, and more preferably 2h. In the present invention, the 2,5-dimercaptothiadiazole n-octylamine condensate is preferably prepared by condensation amination reaction of 2,5-dimercaptothiadiazole and n-octylamine; the molar ratio of the 2,5-dimercaptothiadiazole to n-octylamine is preferably 1:1, the temperature of the condensation amination reaction is preferably 110-130°C, more preferably 120°C; the time is preferably 4-8h, more preferably 6h. The present invention uses didodecyl phosphate octylamine salt and 2,5-dimercaptothiadiazole n-octylamine condensate as an extreme pressure anti-wear agent, which not only solves the problem of poor solubility of traditional lubricating oil extreme pressure anti-wear agents (such as T306 and T308, etc.) in polyether base oil, but also can greatly improve the extreme pressure anti-wear performance of lubricating oil, while avoiding the corrosion and wear problems caused by traditional active sulfur additives, solving the contradiction between extreme pressure and corrosion resistance of hydrocarbon gas compressors, and achieving a balance of overall performance of lubricating oil.

[0032] In terms of mass percentage, the base material in the hydrocarbon gas compressor lubricating oil of the present invention includes 0.05-0.1% of the rust inhibitor, preferably 0.06-0.09%, and more preferably 0.07-0.08%. In the present invention, the rust inhibitor is preferably heptadecenyl imidazoline alkenyl succinate. In the present invention, the heptadecenyl imidazoline alkenyl succinate is preferably T703 of Shanghai Midgard Chemical Co., Ltd. The present invention preferably uses heptadecenyl imidazoline alkenyl succinate as the rust inhibitor, which not only has good rust prevention performance, but also has good compatibility with other additives.

[0033] The hydrocarbon gas compressor lubricating oil of the present invention includes an antifoaming agent, and the mass of the antifoaming agent is 0.001-0.02% of the mass of the base material, preferably 0.005-0.01%. In the present invention, the antifoaming agent is preferably a silicon antifoaming agent and a non-silicon antifoaming agent. In the present invention, the silicon antifoaming agent is preferably polymethyl silicone oil, and the non-silicon antifoaming agent is preferably polyacrylate; the mass ratio of the silicon antifoaming agent and the non-silicon antifoaming agent is preferably 1-3:1-3, more preferably 1-2:1-2. In the present invention, the silicon antifoaming agent polymethyl silicone oil is preferably T901 of Shanghai Shenpu Fine Chemical Plant, and the non-silicon antifoaming agent polyacrylate is preferably T912 of Shanghai Shenpu Fine Chemical Plant. The present invention limits the amount of the antifoaming agent to the above range, which can maintain certain foaming properties and avoid the occurrence of dry friction caused by the destruction of the oil film due to bubbles during the use of the lubricating oil.

[0034] The present invention provides a method for preparing the hydrocarbon gas compressor lubricating oil according to the above technical solution, comprising the following steps:

[0035] The hydrocarbon gas compressor lubricating oil is obtained by mixing water-soluble polyalkylene glycol, synthetic ester base oil, antioxidant, metal passivator, extreme pressure anti-wear agent, rust inhibitor and anti-foaming agent.

[0036] The present invention preferably mixes water-soluble polyalkylene glycol with synthetic ester base oil to obtain a base oil component, adds the antioxidant, metal passivator, extreme pressure anti-wear agent, rust inhibitor and anti-foaming agent to the base oil component at 60-80°C and under stirring conditions, continues to stir for 3-5 hours at 60-80°C after the addition is completed to make the obtained mixture uniform and transparent, and obtains hydrocarbon gas compressor lubricating oil after cooling. In an embodiment of the present invention, the mixing is preferably carried out in a stainless steel blending kettle with a stirrer. The present invention can prepare the hydrocarbon gas compressor lubricating oil in a normal pressure air atmosphere, wherein due to the use of synthetic ester base oil, each component can be well dispersed and dissolved in the water-soluble polyalkylene glycol, so there is no need to stir under vacuum conditions to mix the components evenly, and the operation is simple.

[0037] The present invention provides the use of the hydrocarbon gas compressor lubricating oil described in the above technical solution or the hydrocarbon gas compressor lubricating oil obtained by the preparation method described in the above technical solution in the lubrication of hydrocarbon gas compressors. In the present invention, the hydrocarbon gas compressor lubricating oil is suitable for use in the lubrication of hydrocarbon gas compressors during the pressurized transportation, bottling or separation and recovery of hydrocarbon gases (such as natural gas) in oil and gas fields, petrochemical plants, refineries, liquefied petroleum gas storage and transportation stations or mines.

[0038] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The sources of the raw materials involved in the following examples and comparative examples include:

[0040] The water-soluble polyalkylene glycols include synthetic oil SDM-02C, synthetic oil SDM-03C and synthetic oil SDM-08D, all of which were purchased from Nanjing Well Chemical Co., Ltd. The kinematic viscosity of synthetic oil SDM-02C at 40°C is 68.45 mm 2 / s, the kinematic viscosity of synthetic oil SDM-03C at 40°C is 99.08mm 2 / s, the kinematic viscosity of synthetic oil SDM-08D at 40°C is 1042mm 2 / s;

[0041] The synthetic ester Priolube 3970 was purchased from Croda Company, and the kinematic viscosity at 40°C was 20.31 mm 2 / s;

[0042] Alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate is Irganox L135 from Basf;

[0043] 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate was prepared according to the method of Example 6 in CN200910117591.X;

[0044] N,N-dibutylaminomethylmethylenebenzotriazole is T551 from Changsha Wangcheng Petrochemical Co., Ltd.;

[0045] Heptadecenyl imidazoline succinate is T703 from Shanghai Midgard Chemical Co., Ltd.;

[0046] The silicone antifoaming agent polymethyl silicone oil is T901 from Shanghai Shenpu Fine Chemical Factory;

[0047] The non-silicon antifoaming agent polyacrylate is T912 from Shanghai Shenpu Fine Chemical Factory;

[0048] The preparation method of didodecyl phosphate octylamine salt is as follows: taking equimolar amounts of didodecyl phosphate and n-octylamine in a 100 mL round-bottom flask, heating to 80° C. for reaction for 2 h, and cooling to obtain didodecyl phosphate octylamine salt;

[0049] The preparation method of 2,5-dimercaptothiadiazole n-octylamine condensate is as follows: take equimolar amounts of 2,5-dimercaptothiadiazole and n-octylamine in a 100 mL round-bottom flask, heat to 120° C. for reaction for 6 hours, and cool to obtain 2,5-dimercaptothiadiazole n-octylamine condensate.

[0050] The hydrocarbon gas compressor lubricating oil involved in the following examples and comparative examples is specifically prepared in a stainless steel blending kettle with a stirrer in a normal pressure air atmosphere.

[0051] Example 1

[0052] To 48.5 g of water-soluble polyalkylene glycol synthetic oil SDM-02C, 39.5 g of water-soluble polyalkylene glycol synthetic oil SDM-03C and 10.0 g of synthetic ester Priolube 3970, raise the temperature to 70±5℃ and stir, then add 0.75g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate, 0.25g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate, 0.1g of N,N-dibutylaminomethyl methylene benzotriazole, 0.6g of didodecyl phosphate octylamine salt, 0.2g of 2,5-dimercaptothiadiazole n-octylamine condensate, 0.1g of heptadecenyl imidazoline alkenyl succinate, 0.0133g of silicon-type antifoaming agent polymethyl silicone oil and 0.0067g of non-silicon-type antifoaming agent polyacrylate, stir at 70±5℃ for 3h, cool to room temperature (25℃) to obtain hydrocarbon gas compressor lubricating oil.

[0053] Example 2

[0054] To 88.5 g of water-soluble polyalkylene glycol synthetic oil SDM-03C, 5.0 g of water-soluble polyalkylene glycol synthetic oil SDM-08D and 5.0 g of synthetic ester Priolube 3970, heat to 70±5℃ and stir, then add 0.51g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate, 0.25g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate, 0.07g of N,N-dibutylaminomethyl methylene benzotriazole, 0.4g of didodecyl phosphate octylamine salt, 0.2g of 2,5-dimercaptothiadiazole n-octylamine condensate, 0.07g of heptadecenyl imidazoline alkenyl succinate, 0.005g of silicon-type antifoaming agent polymethyl silicone oil and 0.005g of non-silicon-type antifoaming agent polyacrylate, stir at 70±5℃ for 3h, cool to room temperature (25℃) to obtain hydrocarbon gas compressor lubricating oil.

[0055] Example 3

[0056] To 75.9 g of water-soluble polyalkylene glycol synthetic oil SDM-03C, 20.2 g of water-soluble polyalkylene glycol synthetic oil SDM-08D and 3.0 g of synthetic ester Priolube were added. 3970, heat to 70±5℃ and stir, then add 0.25g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate, 0.25g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate, 0.05g of N,N-dibutylaminomethyl methylene benzotriazole, 0.15g of didodecyl phosphate octylamine salt, 0.15g of 2,5-dimercaptothiadiazole n-octylamine condensate, 0.05g of heptadecenyl imidazoline alkenyl succinate, 0.0003g of silicon-type antifoaming agent polymethyl silicone oil and 0.0007g of non-silicon-type antifoaming agent polyacrylate, stir at 70±5℃ for 3h, cool to room temperature (25℃) to obtain hydrocarbon gas compressor lubricating oil.

[0057] Example 4

[0058] To 57.5 g of water-soluble polyalkylene glycol synthetic oil SDM-03C, 36.0 g of water-soluble polyalkylene glycol synthetic oil SDM-08D and 5.0 g of synthetic ester Priolube were added. 3970, heat to 70±5℃ and stir, then add 0.51g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate, 0.25g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate, 0.07g of N,N-dibutylaminomethyl methylene benzotriazole, 0.4g of didodecyl phosphate octylamine salt, 0.2g of 2,5-dimercaptothiadiazole n-octylamine condensate, 0.07g of heptadecenyl imidazoline alkenyl succinate, 0.005g of silicon-type antifoaming agent polymethyl silicone oil and 0.005g of non-silicon-type antifoaming agent polyacrylate, stir at 70±5℃ for 3h, cool to room temperature (25℃) to obtain hydrocarbon gas compressor lubricating oil.

[0059] Example 5

[0060] To 20.5 g of water-soluble polyalkylene glycol synthetic oil SDM-03C, 73.0 g of water-soluble polyalkylene glycol synthetic oil SDM-08D and 5.0 g of synthetic ester Priolube 3970, heat to 70±5℃ and stir, then add 0.51g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate, 0.25g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate, 0.07g of N,N-dibutylaminomethyl methylene benzotriazole, 0.4g of didodecyl phosphate octylamine salt, 0.2g of 2,5-dimercaptothiadiazole n-octylamine condensate, 0.07g of heptadecenyl imidazoline alkenyl succinate, 0.005g of silicon-type antifoaming agent polymethyl silicone oil and 0.005g of non-silicon-type antifoaming agent polyacrylate, stir at 70±5℃ for 3h, cool to room temperature (25℃) to obtain hydrocarbon gas compressor lubricating oil.

[0061] Comparative Example 1

[0062] A hydrocarbon gas compressor lubricant was prepared according to Example 3, except that 0.25 g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate and 0.25 g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate were replaced with 0.5 g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate.

[0063] Comparative Example 2

[0064] A hydrocarbon gas compressor lubricant was prepared according to Example 3, except that 0.15 g of didodecyl phosphate octylamine salt and 0.15 g of 2,5-dimercaptothiadiazole n-octylamine condensate were replaced with 0.3 g of 2,5-dimercaptothiadiazole n-octylamine condensate.

[0065] The performance tests were conducted on the hydrocarbon gas compressor lubricating oils prepared in the examples and comparative examples. The results are shown in Table 1.

[0066] Table 1 Performance test results of hydrocarbon gas compressor lubricating oils prepared in Examples and Comparative Examples

[0067]

[0068]

[0069] As can be seen from Table 1, the hydrocarbon gas compressor lubricating oil provided by the present invention has outstanding viscosity-temperature performance (viscosity index greater than 210), excellent antioxidant performance (rotating oxygen bomb greater than 850min) and low temperature performance (pour point ≤-45°C without adding pour point depressant), and has excellent extreme pressure anti-wear performance, anti-foaming performance and good rubber compatibility. At the same time, compared with Comparative Example 1, the hydrocarbon gas compressor lubricating oil prepared in Example 3 has excellent antioxidant properties, indicating that the present invention uses 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexyl imidazole hexafluorophosphate and 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate to produce a good positive synergistic effect, which is beneficial to improving the antioxidant performance, oxidation stability and thermal stability of the lubricating oil, preventing sludge formation, and extending the oil change cycle and service life of the oil product; compared with Comparative Example 2, the hydrocarbon gas compressor lubricating oil prepared in Example 3 has excellent extreme pressure and anti-wear properties, indicating that the present invention uses didodecyl phosphate octylamine salt and 2,5-dimercaptothiadiazole n-octylamine condensate to produce a good synergistic effect, which is beneficial to improving the extreme pressure and anti-wear properties of the lubricating oil, and can also improve the corrosion resistance and anti-wear properties when using traditional active sulfur additives.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hydrocarbon gas compressor lubricating oil, comprising a base material and an antifoaming agent, wherein the mass of the antifoaming agent is 0.001-0.02% of the mass of the base material; The matrix material includes the following components in percentage by mass: Water-soluble polyalkylene glycol 88.0~96.1%, synthetic ester base oil 3.0~10.0%, antioxidant 0.5~1.0%, metal passivator 0.05~0.1%, extreme pressure anti-wear agent 0.3~0.8%, rust inhibitor 0.05~0.1%; The antioxidant is 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexylimidazole hexafluorophosphate and 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate, and the mass ratio of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-hexylimidazole hexafluorophosphate to 3-(3,5-di-tert-butyl-4-hydroxyphenyl) alkyl propionate is 1-3:

1.

2. The hydrocarbon gas compressor lubricating oil according to claim 1, characterized in that: The water-soluble polyalkylene glycol comprises at least two of synthetic oil SDM-02C, synthetic oil SDM-03C and synthetic oil SDM-08D; the kinematic viscosity of the water-soluble polyalkylene glycol at 40° C. is 40-2200 mm 2 / s.

3. The hydrocarbon gas compressor lubricating oil according to claim 1, characterized in that: The synthetic ester base oil is a saturated neopentyl polyol ester; the kinematic viscosity of the synthetic ester base oil at 40°C is 10-100 mm 2 / s.

4. The hydrocarbon gas compressor lubricating oil according to claim 1, characterized in that: The extreme pressure anti-wear agent is a condensation product of didodecyl phosphate octylamine salt and 2,5-dimercaptothiadiazole n-octylamine, and the mass ratio of the condensation product of didodecyl phosphate octylamine salt and 2,5-dimercaptothiadiazole n-octylamine is 1-3:

1.

5. The hydrocarbon gas compressor lubricating oil according to claim 1, characterized in that: The metal deactivator is a benzotriazole derivative.

6. The hydrocarbon gas compressor lubricating oil according to claim 1, characterized in that: The rust inhibitor is heptadecenyl imidazoline alkenyl succinate.

7. The hydrocarbon gas compressor lubricating oil according to claim 1, characterized in that: The antifoaming agent is a silicon-based antifoaming agent and a non-silicon-based antifoaming agent.

8. The method for preparing the hydrocarbon gas compressor lubricating oil according to any one of claims 1 to 7, comprising the following steps: The lubricating oil for hydrocarbon gas compressor is obtained by mixing water-soluble polyalkylene glycol, synthetic ester base oil, antioxidant, metal passivator, extreme pressure anti-wear agent, rust inhibitor and anti-foaming agent.

9. Use of the hydrocarbon gas compressor lubricating oil according to any one of claims 1 to 7 or the hydrocarbon gas compressor lubricating oil prepared by the preparation method according to claim 8 in lubricating a hydrocarbon gas compressor.

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