A centrifugal air compressor lubricating oil composition

Abstract

The application discloses a centrifugal air compressor lubricating oil composition, which comprises the following components in percentage by mass: ionic liquid 0.5-5%; antioxidant 0.1-1%; antirust agent 0.1-1%; metal deactivator 0.05-0.5%; demulsifier 0.01-0.1%; antifoaming agent 0.005-0.05%; and the balance is base oil. The main additive component of the centrifugal air compressor lubricating oil composition is ionic liquid, which not only has good solubility, but also can show excellent compatibility when matched with other components. On the other hand, the centrifugal air compressor lubricating oil composition has relatively excellent oxidation resistance, rust resistance, corrosion resistance, emulsion resistance and antifoaming performance, especially relatively excellent rust resistance. The lubricating oil composition can play an excellent lubricating role, prolong the service life of the centrifugal air compressor and broaden the use range of the centrifugal air compressor.

Description

A centrifugal air compressor lubricating oil composition Technical Field

[0001] This invention belongs to the field of lubricating oil technology, and specifically relates to a lubricating oil composition for centrifugal air compressors. Background Technology

[0002] Centrifugal air compressors are small in size, light in weight, compact in structure, have fewer parts, are easy to maintain, and offer good cooling, high efficiency, and stable gas delivery. Therefore, they are widely used in the compressor equipment field, especially in industries such as food, pharmaceuticals, textiles, and mining, where their market share is showing a significant upward trend. To further improve the working efficiency of centrifugal air compressors, reduce maintenance costs, and expand their application range, centrifugal air compressors have been rapidly developing towards simplification, compactness, and lightweighting in recent years. At the same time, the operating conditions, such as equipment pressure, temperature, stage pressure ratio, and discharge volume, are constantly increasing, making the operating conditions more demanding. Consequently, the requirements for the service life, oxidation resistance, rust prevention, and corrosion resistance of centrifugal air compressor lubricating oils are also becoming increasingly stringent.

[0003] While current centrifugal air compressor lubricants can improve various properties (e.g., oxidation resistance, rust prevention, corrosion resistance, demulsification, and anti-foaming properties) to some extent, the degree of improvement remains limited, leaving room for further enhancement, particularly in rust prevention. Therefore, there is an urgent need to provide a centrifugal air compressor lubricant composition that offers superior oxidation resistance, rust prevention, corrosion resistance, demulsification, and anti-foaming properties. Summary of the Invention

[0004] The purpose of this invention is to provide a centrifugal air compressor lubricating oil composition that has excellent antioxidant, rust-preventive, corrosion-resistant, demulsifying, and anti-foaming properties, and can meet the lubrication requirements of centrifugal air compressors under harsh operating conditions.

[0005] The technical solution adopted in this invention is a centrifugal air compressor lubricating oil composition, comprising the following components by mass percentage: 0.5-5% ionic liquid; 0.1-1% antioxidant; 0.1-1% rust inhibitor; 0.05-0.5% metal passivator; 0.01-0.1% demulsifier; 0.005-0.05% antifoaming agent; and the balance being base oil.

[0006] The invention is further characterized in that,

[0007] The composition comprises the following components by mass percentage: 2-4% ionic liquid; 0.5-1% antioxidant; 0.5-1% rust inhibitor; 0.1-0.3% metal passivator; 0.02-0.05% demulsifier; 0.01-0.03% antifoaming agent; and the balance being base oil.

[0008] The structural formula of ionic liquid is:

[0009]

[0010] The antioxidant is at least one of dioctyl diphenylamine, dinonyl diphenylamine, styryl octyl diphenylamine, octyl butyl diphenylamine, octyl pentyl diphenylamine, nonyl butyl diphenylamine and 4,4'-methylenebis(2,6-di-tert-butylphenol).

[0011] The rust inhibitor is at least one of dinonylnaphthalenesulfonate calcium, dodecenyl succinic acid, isononylphenoxyacetic acid, dodecenyl succinic acid half ester and dodecenyl succinic acid monoester.

[0012] The metal passivating agent is at least one of methylbenzotriazole, N,N'-dialkylaminomethylenetriazole, and N,N'-disaline propylenediamine.

[0013] The demulsifier is oil-soluble polyether DL32; the antifoaming agent is No. 1 composite antifoaming agent; the base oil is hydrogenated mineral oil VHVI 6.

[0014] The beneficial effects of this invention are as follows: The centrifugal air compressor lubricating oil composition of this invention, on the one hand, has an ionic liquid as its main additive component, which not only has good solubility but also exhibits excellent compatibility when combined with other components. On the other hand, this centrifugal air compressor lubricating oil composition possesses superior antioxidant properties (high rotational oxygen bomb properties), rust prevention properties (qualified by liquid phase corrosion B method), corrosion resistance properties (corrosion grade of copper sheet is 1b or higher at 100℃ for 3 hours), demulsification properties (oil-water separation time less than or equal to 10 minutes), and anti-foaming properties (foaming tendency / foaming stability less than or equal to 10 / 0 mL / mL), especially exhibiting superior rust prevention properties. When used in the shaft seals, gears, and bearings of centrifugal air compressors, this centrifugal air compressor lubricating oil composition provides excellent lubrication, extends the service life of the centrifugal air compressor, and broadens its application range. Detailed Implementation

[0015] The present invention will now be described in detail with reference to specific embodiments.

[0016] This invention discloses a centrifugal air compressor lubricating oil composition, comprising the following components by mass percentage: 0.5-5% ionic liquid; 0.1-1% antioxidant; 0.1-1% rust inhibitor; 0.05-0.5% metal passivator; 0.01-0.1% demulsifier; 0.005-0.05% antifoaming agent; the balance being base oil.

[0017] The structural formula of ionic liquid is:

[0018]

[0019] In this invention, the raw materials for antioxidants, rust inhibitors, metal passivators, demulsifiers, antifoaming agents, and base oils can be further selected in order to further improve the compatibility of each raw material and improve the overall performance of the centrifugal air compressor lubricating oil composition.

[0020] Furthermore, the composition comprises, by weight percentage, the following components: 2-4% ionic liquid; 0.5-1% antioxidant; 0.5-1% rust inhibitor; 0.1-0.3% metal passivator; 0.02-0.05% demulsifier; 0.01-0.03% antifoaming agent; the balance being base oil. This centrifugal air compressor lubricating oil composition exhibits superior overall performance (oxidation resistance, rust prevention, corrosion resistance, demulsification, and antifoaming properties).

[0021] The antioxidant is at least one of dioctyl diphenylamine, dinonyl diphenylamine, styryl octyl diphenylamine, octyl butyl diphenylamine, octyl pentyl diphenylamine, nonyl butyl diphenylamine and 4,4'-methylenebis(2,6-di-tert-butylphenol);

[0022] The rust inhibitor is at least one of the following: calcium dinonylnaphthalenesulfonate, dodecenyl succinic acid, isononylphenoxyacetic acid, dodecenyl succinic acid half ester and dodecenyl succinic acid monoester;

[0023] The metal passivating agent is at least one of methylbenzotriazole, N,N'-dialkylaminomethylenetriazole and N,N'-disaline propylenediamine;

[0024] The demulsifier is oil-soluble polyether DL32; the antifoaming agent is No. 1 composite antifoaming agent; the base oil is hydrogenated mineral oil VHVI 6.

[0025] The centrifugal air compressor lubricating oil composition of the present invention can be obtained by uniformly mixing the raw materials according to the above composition. The present invention does not impose any particular limitations on the order of addition of the raw materials, the stirring rate, or the mixing temperature.

[0026] The centrifugal air compressor lubricating oil composition of the present invention not only has excellent comprehensive properties (antioxidant, rust prevention, corrosion resistance, demulsification and anti-foaming properties), but also has a simple preparation process, is easy to operate, and has a wide range of applications.

[0027] Example 1

[0028] The composition of the centrifugal air compressor lubricating oil composition in this embodiment is shown in Table 1. The structural formula of the ionic liquid is:

[0029]

[0030] Table 1. Composition of Lubricating Oil for Centrifugal Air Compressors

[0031]

[0032]

[0033] Example 2

[0034] The composition of the centrifugal air compressor lubricating oil composition in this embodiment is shown in Table 2. The structural formula of the ionic liquid is:

[0035]

[0036] Table 2 Composition of Lubricating Oil for Centrifugal Air Compressors

[0037] Name | Mass Percentage | Ionic Liquid | 2-Dinonyldiphenylamine | 0.5-Octylacetonyldiphenylamine | 0.5-Dodecenylsuccinic Acid Monoester | 1-N,N'-Dialkylaminomethylenetriazole | 0.3-DL32 | 0.02 | 1# Composite Antifoaming Agent | 0.01 | VHVI | 695.67 surface

[0038] Example 3

[0039] The composition of the centrifugal air compressor lubricating oil composition in this embodiment is shown in Table 3. The structural formula of the ionic liquid is:

[0040]

[0041] Table 3 Composition of Lubricating Oil for Centrifugal Air Compressors

[0042] Name | Mass Percentage | Ionic Liquid | 5% Styrene-Octyl Diphenylamine | 0.1% Isononylphenoxyacetic Acid | 0.1% N,N'-Disalicylic Acid Propylene Diamine | 0.5% DL32 | 0.011# Composite Antifoaming Agent | 0.005% VHVI | 694.285% surface

[0043] Example 4

[0044] The composition of the centrifugal air compressor lubricating oil composition in this embodiment is shown in Table 4. The structural formula of the ionic liquid is:

[0045]

[0046] Table 4 Composition of Lubricating Oil for Centrifugal Air Compressors

[0047] Name | Mass Percentage | Ionic Liquid | 0.5% | Nonylbutyldiphenylamine | 1% | Dinonylnaphthalenesulfonate Calcium | 1% | Methylbenzotriazole | 0.05% | DL32 | 0.11# | Composite Antifoaming Agent | 0.05% | VHVI | 697.3% surface

[0048] Comparative Example 1

[0049] The composition of the centrifugal air compressor lubricating oil composition of this comparative example is shown in Table 5.

[0050] Table 5 Composition of Lubricating Oil for Centrifugal Air Compressors

[0051] Name | Mass Percentage | Octylbutyldiphenylamine 0.5 | 4,4'-Methylenebis(2,6-di-tert-butylphenol) 0.5 | Dodecenylsuccinic acid 0.5 | Methylbenzotriazole 0.3 | DL32 0.02 | 1# Composite antifoaming agent 0.01 | VHVI 698.17 surface

[0052] Comparative Example 2

[0053] The composition of the centrifugal air compressor lubricating oil composition in this comparative example is shown in Table 6. The structural formula of the ionic liquid is:

[0054]

[0055] Where n = 2

[0056] Table 6 Composition of Lubricating Oil for Centrifugal Air Compressors

[0057] Name | Mass Percentage | Ionic Liquid | 1 | Dinoyldiphenylamine | 0.5 | Octylpentyldiphenylamine | 0.5 | Dodecenylsuccinic acid monoester | 0.5 | N,N'-Dialkylaminomethylenetriazole | 0.3 | DL32 | 0.02 | 1# Composite Antifoaming Agent | 0.01 | VHVI | 697.17 surface

[0058] Comparative Example 3

[0059] The composition of the centrifugal air compressor lubricating oil composition in this comparative example is shown in Table 7. The structural formula of the ionic liquid is:

[0060]

[0061] Table 7 Composition of Lubricating Oil for Centrifugal Air Compressors

[0062] Name | Mass Percentage | Ionic Liquid | 5.5% | Styrene-Octyl Diphenylamine | 0.08% | Isononylphenoxyacetic Acid | 0.08% | N,N'-Disalicylic Acid Propylene Diamine | 0.55% | DL32 | 0.0051# | Composite Antifoaming Agent | 0.003% | VHVI | 693.785% surface

[0063] Comparative Example 4

[0064] The composition of the centrifugal air compressor lubricating oil composition in this comparative example is shown in Table 8. The structural formula of the ionic liquid is:

[0065]

[0066] Table 8 Composition of Lubricating Oil Composition for Centrifugal Air Compressors

[0067]

[0068]

[0069] Performance Characterization

[0070] 1. Performance tests were conducted on the base oil VHVI 6, and the test results are shown in Table 9.

[0071] Table 9. Base Oil VHVI 6 Performance Test Results

[0072] Project VHVI 6 test method kinematic viscosity (40℃) / (mm 2 / s)31.4 GB / T 265 Viscosity Index 126 GB / T 1995 Pour Point / ℃ -18 GB / T 3535 Flash Point (Open Cup) / ℃ 240 GB / T 3536 surface

[0073] 2. The performance of the centrifugal air compressor lubricating oil compositions in the examples and comparative examples was tested, and the test results are shown in Table 10.

[0074] Table 10 Performance Test Results of Centrifugal Air Compressor Lubricating Oil Composition

[0075]

[0076]

[0077] As can be seen from Table 10, the centrifugal air compressor lubricating oil composition prepared in the embodiments of the present invention has excellent antioxidant, rust-preventive, corrosion-preventive, demulsifying and anti-foaming properties, especially excellent rust-preventive properties.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 centrifugal air compressor lubricating oil composition, characterized in that, The composition comprises, by weight percentage, the following components: 2-4% ionic liquid; 0.5-1% antioxidant; 0.5-1% rust inhibitor; 0.1-0.3% metal passivator; 0.02-0.05% demulsifier; 0.01-0.03% antifoaming agent; the balance being base oil; the structural formula of the ionic liquid is: The antioxidant is at least one of dioctyl diphenylamine, dinonyl diphenylamine, styryl octyl diphenylamine, octyl butyl diphenylamine, octyl pentyl diphenylamine, nonyl butyl diphenylamine, and 4,4'-methylenebis(2,6-di-tert-butylphenol).

2. The centrifugal air compressor lubricating oil composition according to claim 1, characterized in that, The rust inhibitor is at least one of dinonylnaphthalenesulfonate calcium, dodecenyl succinic acid, isononylphenoxyacetic acid, dodecenyl succinic acid half ester and dodecenyl succinic acid monoester.

3. The centrifugal air compressor lubricating oil composition according to claim 1, characterized in that, The metal passivating agent is at least one of methylbenzotriazole, N,N'-dialkylaminomethylenetriazole, and N,N'-disaline propylenediamine.

4. The centrifugal air compressor lubricating oil composition according to claim 1, characterized in that, The demulsifier is oil-soluble polyether DL32; the antifoaming agent is No. 1 composite antifoaming agent; and the base oil is hydrogenated mineral oil VHVI 6.

Images