Screw compressor lubricating oil and screw compressor

Abstract

The present invention provides a screw compressor lubricant and a screw compressor. The screw compressor lubricant of the present invention comprises, by mass percentage, 0.1-3% of ionic liquid; 0.1-3% of antioxidant; 0.01-0.5% of metal deactivator; 0.01-0.5% of rust inhibitor; 0.001-0.05% of demulsifier; 0.001-0.05% of antifoaming agent; the balance is base oil; wherein the ionic liquid comprises a structure of formula 1. The screw compressor lubricant of the present invention has relatively excellent antioxidant, wear resistance, rust resistance, corrosion resistance, demulsification resistance, antifoaming resistance and environmental friendliness.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating oils, and in particular to a screw compressor lubricating oil and a screw compressor. Background Art

[0002] Screw compressors have the characteristics of good energy saving, high degree of automation and good dynamic balance. They are widely used in the field of compressor equipment, and the market share of screw compressors is increasing year by year. In order to further improve the working efficiency of screw compressors, in recent years, screw compressors have been developed in the direction of simplification, compactness and lightweight, and the corresponding requirements for the service life, anti-oxidation, anti-wear, anti-rust and anti-corrosion performance of screw compressor lubricants are getting higher and higher.

[0003] Although the current screw compressor lubricating oil can improve the various properties of the screw compressor lubricating oil to a certain extent (for example, oxidation resistance, wear resistance, rust resistance, corrosion resistance, emulsification resistance and foam resistance), the degree of improvement of the various properties of the screw compressor lubricating oil is still limited, so that there is room for further improvement in the various properties of the screw compressor lubricating oil, especially the oxidation resistance of the screw compressor lubricating oil. In addition, the environmental friendliness of the screw compressor lubricating oil in the prior art is poor. Therefore, it is urgent to provide a screw compressor lubricating oil with more excellent oxidation resistance, wear resistance, rust resistance, corrosion resistance, emulsification resistance, foam resistance and environmental friendliness. Summary of the invention

[0004] The invention provides a screw compressor lubricating oil, which has relatively excellent oxidation resistance, wear resistance, rust resistance, corrosion resistance, emulsification resistance, foam resistance and environmental friendliness.

[0005] The present invention provides a screw compressor. Since the screw compressor includes the above-mentioned screw compressor lubricating oil, the anti-oxidation, anti-wear, anti-rust and anti-corrosion properties of the rotor, shaft seal, gear, bearing and other parts of the screw compressor are good. The screw compressor has a long service life and a wide range of applications.

[0006] The present invention provides a screw compressor lubricating oil, which comprises, by mass percentage:

[0007]

[0008] The balance is base oil;

[0009] Wherein, the ionic liquid comprises the following structure:

[0010]

[0011] Wherein, n is a positive integer selected from 8-12.

[0012] The screw compressor lubricating oil as described above, wherein the content by mass percentage includes:

[0013]

[0014] The balance is base oil.

[0015] The screw compressor lubricating oil as described above, wherein the mass ratio of the antioxidant to the ionic liquid is 1:(0.5-1).

[0016] The screw compressor lubricating oil as described above, wherein the metal deactivator is selected from at least one of N,N'-dialkylaminomethylenebenzotriazole, toluenetriazole and N,N'-disalicylidenepropylenediamine.

[0017] The screw compressor lubricating oil as described above, wherein the antioxidant is selected from at least one of dioctyldiphenylamine, dinonyldiphenylamine, octylbutyldiphenylamine, nonylbutyldiphenylamine, phenyl-α-naphthylamine, octylated phenyl-α-naphthylamine, 2,6-di-tert-butyl-p-cresol and 4,4'-methylenebis(2,6-di-tert-butylphenol).

[0018] The screw compressor lubricating oil as described above, wherein the rust inhibitor is selected from at least one of isononylphenoxyacetic acid, sorbitan monooleate and alkenylsuccinic acid.

[0019] The screw compressor lubricating oil as described above, wherein the demulsifier is selected from at least one of oil-soluble polyethers and condensates of amines and ethylene oxide.

[0020] The screw compressor lubricating oil as described above, wherein the anti-foaming agent is selected from at least one of dimethyl silicone oil, polymethyl silicone oil and polyacrylate.

[0021] The screw compressor lubricating oil as described above, wherein the base oil is pentaerythritol ester.

[0022] The present invention also provides a screw compressor, which comprises the screw compressor lubricating oil as described above.

[0023] The present invention provides a screw compressor lubricant, which includes a specific content of ionic liquid, an antioxidant, a metal deactivator, a rust inhibitor, a demulsifier, an antifoaming agent and a base oil, wherein the ionic liquid includes a structure shown in Formula 1. Since the ionic liquid constituting the screw compressor lubricant includes the structure shown in Formula 1, the screw compressor lubricant has relatively excellent comprehensive performance. It is worth mentioning that the screw compressor lubricant prepared using the ionic liquid also has relatively excellent environmental friendliness and has a relatively broad application prospect.

[0024] The screw compressor of the present invention includes the above-mentioned screw compressor lubricating oil, so the anti-oxidation, anti-wear, anti-rust and anti-corrosion properties of its rotor, shaft seal, gear, bearing and other parts are good, and the screw compressor has a long service life and a wide range of applications. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only 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.

[0026] The first aspect of the present invention provides a screw compressor lubricating oil, comprising, by mass percentage:

[0027]

[0028] The balance is base oil;

[0029] Among them, ionic liquids include the following structures:

[0030]

[0031] Wherein, n is a positive integer selected from 8-12.

[0032] The present invention does not limit the specific source of the ionic liquid. The ionic liquid can be prepared by a preparation method commonly used in the art, or it can be purchased commercially.

[0033] The antioxidant, metal deactivator, rust inhibitor, demulsifier, antifoaming agent and base oil of the present invention are not particularly limited and can be selected from antioxidants, metal deactivators, rust inhibitors, demulsifiers, antifoaming agents and base oils commonly used in the art.

[0034] In the present invention, the screw compressor lubricant includes the structure of formula 1. On the one hand, the main component of the screw compressor lubricant is the ionic liquid shown in formula 1, which not only has good solubility, but also can show excellent compatibility when matched with other components. On the other hand, the screw compressor lubricant has relatively excellent antioxidant properties (high rotating oxygen bomb), wear resistance (FZG gear machine failure level is 8 and above), rust resistance (liquid phase rust qualified), corrosion resistance (100°C, 3h copper sheet corrosion level is 1b and above), anti-emulsification (oil-water separation time is less than or equal to 10min) and anti-foaming performance (foam tendency / foam stability is less than or equal to 10 / 0mL / mL), especially has relatively excellent antioxidant and wear resistance. The screw compressor lubricant of the present invention is used for the rotor, shaft seal, gear and bearing of the screw compressor, etc., and can play an excellent lubricating role, prolong the service life of the screw compressor, and broaden the scope of use of the screw compressor.

[0035] It is worth mentioning that the ionic liquid does not contain sulfur and phosphorus elements. When the ionic liquid is used to prepare screw compressor lubricating oil, the content of phosphorus and sulfur elements in the screw compressor lubricating oil can be reduced as much as possible. Therefore, the screw compressor lubricating oil also has relatively excellent environmental friendliness and is convenient for industrial application.

[0036] Furthermore, when the screw compressor lubricant oil comprises, by mass percentage:

[0037]

[0038] When the residual amount is taken as the basis, the screw compressor lubricant has more excellent comprehensive properties (anti-oxidation, anti-wear, anti-rust, anti-corrosion, anti-emulsification and anti-foaming).

[0039] In some embodiments of the present invention, in order to further improve the comprehensive performance of the screw compressor lubricant, the mass ratio of the antioxidant to the ionic liquid is 1:(0.5-1).

[0040] In the present invention, the raw materials of antioxidant, metal deactivator, rust inhibitor, demulsifier, antifoaming agent and base oil can be further selected to further improve the compatibility of each raw material and improve the comprehensive performance and environmental performance of the screw compressor lubricant.

[0041] In some embodiments of the present invention, the metal deactivator is selected from at least one of N,N'-dialkylaminomethylenebenzotriazole, toluenetriazole and N,N'-disalicylidenepropylenediamine.

[0042] In some embodiments of the present invention, the antioxidant is selected from at least one of dioctyldiphenylamine, dinonyldiphenylamine, octylbutyldiphenylamine, nonylbutyldiphenylamine, phenyl-α-naphthylamine, octylated phenyl-α-naphthylamine, 2,6-di-tert-butyl-p-cresol and 4,4'-methylenebis(2,6-di-tert-butylphenol).

[0043] In some embodiments of the present invention, the rust inhibitor is selected from at least one of isononylphenoxyacetic acid, sorbitol monooleate and alkenyl succinic acid. When the rust inhibitor is alkenyl succinic acid, the number of carbon atoms in the alkenyl group is 8-16.

[0044] In some embodiments of the present invention, the demulsifier is selected from at least one of an oil-soluble polyether and a condensate of an amine and ethylene oxide.

[0045] The present invention does not particularly limit the oil-soluble polyether, and the oil-soluble polyether commonly used in the art can be selected.

[0046] In the present invention, the condensate of amine and ethylene oxide refers to a compound formed by a condensation reaction between an amino group in an amino compound and an epoxy group in ethylene oxide. The present invention does not limit the amount of the compound participating in the condensation reaction, nor does it specifically limit the specific conditions of the condensation reaction, as long as the above-mentioned condensation reaction can occur.

[0047] In the present invention, the condensate can also be obtained through commercial purchase.

[0048] In some embodiments of the present invention, the anti-foaming agent is selected from at least one of dimethyl silicone oil, polymethyl silicone oil and polyacrylate.

[0049] The present invention does not impose any particular limitation on the molecular weight of the above polymer.

[0050] In some embodiments of the present invention, the base oil is a pentaerythritol ester.

[0051] The screw compressor lubricant in some embodiments of the present invention can be obtained by uniformly mixing the raw materials according to the above composition. The present invention does not specifically limit the order of adding the raw materials, the stirring rate, and the mixing temperature.

[0052] The screw compressor lubricating oil of the present invention not only has relatively excellent comprehensive performance (anti-oxidation, anti-wear, anti-rust, anti-corrosion, anti-emulsification and anti-foaming) and environmental friendliness, but also has a simple preparation process, is easy to operate and has a wide range of applications.

[0053] A second aspect of the present invention provides a screw compressor, comprising the above-mentioned screw compressor lubricating oil.

[0054] In the present invention, since the rotor, shaft seal, gear and bearing of the screw compressor contain the above-mentioned screw compressor lubricating oil, the screw compressor has a long service life and is widely used in industry.

[0055] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0056] The structural formula of the ionic liquid in each embodiment and comparative example is Formula 1, which is obtained through commercial purchase;

[0057]

[0058] Wherein n is a positive integer selected from 8-12.

[0059] The alkenyl succinic acid in each embodiment and comparative example is T746;

[0060] The oil-soluble polyether in each embodiment and comparative example is DL32;

[0061] The condensate of amine and ethylene oxide in each embodiment and comparative example is T1001; the polymethyl silicone oil in each embodiment and comparative example is T901;

[0062] The polyacrylate in each embodiment and comparative example is T912.

[0063] Example 1

[0064] The composition of the screw compressor lubricating oil of this embodiment is shown in Table 1.

[0065] Table 1

[0066] name Mass percentage / % Ionic liquid (n=9) 3 Dioctyldiphenylamine 1.5 2,6-Di-tert-butyl-p-cresol 1.5 N,N'-Dialkylaminomethylenebenzotriazole 0.3 Succinic acid 0.3 Oil soluble polyether 0.03 Dimethicone 0.015 Polyacrylate 0.015 Pentaerythritol ester 93.34

[0067] Example 2

[0068] The composition of the screw compressor lubricating oil of this embodiment is shown in Table 2.

[0069] Table 2

[0070]

[0071]

[0072] Example 3

[0073] The composition of the screw compressor lubricating oil of this embodiment is shown in Table 3.

[0074] Table 3

[0075] name Mass percentage / % Ionic liquid (n=8) 3 Octylated phenyl-α-naphthylamine 0.05 2,6-Di-tert-butyl-p-cresol 0.05 N,N'-Di-salicylidenepropylenediamine 0.05 Isononylphenoxyacetic acid 0.05 Amine and ethylene oxide condensation product 0.001 Polyacrylate 0.001 Pentaerythritol ester 96.798

[0076] Example 4

[0077] The composition of the screw compressor lubricating oil of this embodiment is shown in Table 4.

[0078] Table 4

[0079] name quality% Ionic liquid (n=12) 0.1 Octylbutyldiphenylamine 0.1 N,N'-Dialkylaminomethylenebenzotriazole 0.1 Succinic acid 0.1 Oil soluble polyether 0.005 Dimethicone 0.005 Polyacrylate 0.005 Pentaerythritol ester 99.585

[0080] Example 5

[0081] The composition of the screw compressor lubricating oil of this embodiment is shown in Table 5.

[0082] Table 5

[0083] name Mass percentage / % Ionic liquid (n=9) 2 Dioctyldiphenylamine 0.5 2,6-Di-tert-butyl-p-cresol 0.5 N,N'-Dialkylaminomethylenebenzotriazole 0.1 Succinic acid 0.1 Oil soluble polyether 0.01 Dimethicone 0.005 Polyacrylate 0.005 Pentaerythritol ester 96.78

[0084] Example 6

[0085] The composition of the screw compressor lubricating oil of this embodiment is shown in Table 6.

[0086] Table 6

[0087] name Mass percentage / % Ionic liquid (n=9) 2 Dioctyldiphenylamine 1 2,6-Di-tert-butyl-p-cresol 1 N,N'-Dialkylaminomethylenebenzotriazole 0.1 Succinic acid 0.1 Oil soluble polyether 0.01 Dimethicone 0.005 Polyacrylate 0.005 Pentaerythritol ester 95.78

[0088] Comparative Example 1

[0089] The composition of the screw compressor lubricating oil of this comparative example is shown in Table 7.

[0090] Table 7

[0091] name Mass percentage / % Dioctyldiphenylamine 1.5 2,6-Di-tert-butyl-p-cresol 1.5 N,N'-Dialkylaminomethylenebenzotriazole 0.3 Succinic acid 0.3 Oil soluble polyether 0.03 Dimethicone 0.015 Polyacrylate 0.015 Pentaerythritol ester 96.34

[0092] Comparative Example 2

[0093] The composition of the screw compressor lubricating oil of this comparative example is shown in Table 8.

[0094] Table 8

[0095] name Mass percentage / % Ionic liquid (n=12) 5 Nonylbutyldiphenylamine 2 4,4'-Methylenebis(2,6-di-tert-butylphenol) 2 Tolyltriazole 1 Isononylphenoxyacetic acid 1 Amine and ethylene oxide condensation product 0.1 Polymethyl silicone oil 0.05 Polyacrylate 0.05 Pentaerythritol ester 88.8

[0096] Comparative Example 3

[0097] The composition of the screw compressor lubricating oil of this comparative example is shown in Table 9.

[0098] Table 9

[0099]

[0100]

[0101] Performance Characterization

[0102] 1. The performance of base oil pentaerythritol ester was tested. The test results are shown in Table 10.

[0103] Table 10

[0104] project Pentaerythritol ester Test methods <![CDATA[Kinematic viscosity (40 °C) / (mm 2 / s)]]> 46.12 GB / T 265 Viscosity Index 110 GB / T 2541 Pour point / ℃ -45 GB / T 3535 Flash point (open) / ℃ 282 GB / T 3536 Acid value / (mgKOH / g) 0.01 GB / T 4945 Moisture / % trace GB / T 260

[0105] 2. The performance of the screw compressor lubricating oils in the embodiments and comparative examples was tested. The test results are shown in Table 11.

[0106] Table 11

[0107]

[0108]

[0109] It can be seen from Table 11 that the screw compressor lubricating oil prepared in the embodiment of the present invention has relatively excellent antioxidant, anti-wear, anti-rust, anti-corrosion, anti-emulsification and anti-foaming properties, especially has relatively excellent antioxidant and anti-wear properties.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A screw compressor lubricating oil, characterized in that: According to the mass percentage, it includes: The balance is base oil; Wherein, the ionic liquid comprises the following structure: Wherein, n is a positive integer selected from 8 to 12; The mass ratio of the antioxidant to the ionic liquid is 1:(0.5-1); The metal deactivator is selected from at least one of N,N'-dialkylaminomethylenebenzotriazole, toluenetriazole and N,N'-disalicylidenepropylenediamine; The antioxidant is selected from at least one of dioctyldiphenylamine, dinonyldiphenylamine, octylbutyldiphenylamine, nonylbutyldiphenylamine, phenyl-α-naphthylamine, octylated phenyl-α-naphthylamine, 2,6-di-tert-butyl-p-cresol and 4,4'-methylenebis(2,6-di-tert-butylphenol).

2. The screw compressor lubricating oil according to claim 1, characterized in that: According to the mass percentage, it includes: The balance is base oil.

3. The screw compressor lubricating oil according to claim 1, characterized in that: The rust inhibitor is selected from at least one of isononylphenoxyacetic acid, sorbitan monooleate and alkenylsuccinic acid.

4. The screw compressor lubricating oil according to claim 1, characterized in that: The demulsifier is selected from at least one of oil-soluble polyethers and condensates of amines and ethylene oxide.

5. The screw compressor lubricating oil according to claim 1, characterized in that: The anti-foaming agent is selected from at least one of dimethyl silicone oil, polymethyl silicone oil and polyacrylate.

6. The screw compressor lubricating oil according to claim 1, characterized in that: The base oil is pentaerythritol ester.

7. A screw compressor, characterized in that: The invention comprises the screw compressor lubricating oil according to any one of claims 1 to 6.

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