Cylinder oil composition of polyether high-pressure natural gas compressor

Abstract

The polyether cylinder oil composition for the high-pressure natural gas compressor is characterized by comprising the following components in percentage by mass: 96.0 to 98.5 percent of polyether base oil, 1.5 to 3.5 percent of an antioxidant, 0.03 to 0.1 percent of a metal deactivator, 0.05 to 0.12 percent of an ashless extreme pressure anti-wear agent, 0.08 to 0.15 percent of an anti-rust agent and 0.005 to 0.03 percent of an anti-foaming agent, and the sum of the mass percent of the components is 100 percent. According to the polyether cylinder oil composition for the high-pressure natural gas compressor, the polyether base oil is adopted, so that the alkane flushing resistance is excellent, and the oil film stability is high; the composition also has the characteristics of high-temperature stability, lubricity, good compatibility with other additives and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of compressor lubricating oil, and in particular relates to a polyether high-pressure natural gas compressor cylinder oil composition. Background Art

[0002] Underground natural gas storage has become the main strategic energy storage model for my country's future civil and military use. It usually uses high-power reciprocating compressors to compress natural gas into underground cavities for storage through the work of the terminal compression cylinder, and then reduces the pressure and outputs it during the use phase.

[0003] Compared with ordinary reciprocating compressors, high-power reciprocating compressors use independent lubrication systems at the power end and the terminal compression cylinder. The lubrication stroke at the compression end only includes the sealing box and the compression piston cylinder. The lubrication stroke is short and the temperature is high. The lubricating oil will come into contact with high-pressure natural gas at the compression end. Due to the strong flushing and dilution ability of alkanes, the lubricating oil film will be flushed, causing mechanical hazards. Summary of the invention

[0004] The object of the present invention is to provide a polyether high-pressure natural gas compressor cylinder oil composition, which has the characteristics of anti-alkane flushing ability and high oil film stability.

[0005] The technical solution adopted by the present invention is a polyether high-pressure natural gas compressor cylinder oil composition, which is characterized in that it includes the following components in terms of mass percentage: 96.0%-98.5% of polyether base oil, 1.5%-3.5% of antioxidant, 0.03%-0.1% of metal passivator, 0.05%-0.12% of ashless extreme pressure anti-wear agent, 0.08%-0.15% of rust inhibitor, and 0.005%-0.03% of anti-foaming agent, and the sum of the mass percentages of the above components is 100%.

[0006] The present invention is also characterized in that:

[0007] The polyether base oil is composed of a mixture of ethylene oxide and propylene oxide, and the molar ratio of the ethylene oxide chain segment is 70% to 75%.

[0008] The antioxidant is prepared by mixing one or two components of alkyl diphenylamine and naphthylamine in any proportion.

[0009] The metal passivator is a liquid methylbenzotriazole derivative.

[0010] The ashless extreme pressure anti-wear agent is an ashless liquid dithiophosphate.

[0011] The rust inhibitor is liquid alkenyl succinic acid half fat.

[0012] The antifoaming agent is a composite antifoaming agent.

[0013] The beneficial effects of the present invention are:

[0014] The polyether high-pressure natural gas compressor cylinder oil composition of the present invention adopts polyether base oil, has excellent anti-alkane flushing ability and high oil film stability; the composition also has the characteristics of high temperature stability, lubricity, good compatibility with other additives, etc. DETAILED DESCRIPTION

[0015] The present invention is described in detail below with reference to specific embodiments.

[0016] The polyether high-pressure natural gas compressor cylinder oil composition of the present invention comprises the following components in percentage by mass: 96.0%-98.5% of polyether base oil, 1.5%-3.5% of antioxidant, 0.03%-0.1% of metal passivator, 0.05%-0.12% of ashless extreme pressure anti-wear agent, 0.08%-0.15% of rust inhibitor, and 0.005%-0.03% of anti-foaming agent, and the sum of the percentages by mass of the above components is 100%.

[0017] The polyether base oil is composed of a mixture of ethylene oxide and propylene oxide, and the molar ratio of the ethylene oxide chain segment is 70% to 75%. It has good resistance to natural gas dilution and flushing, can meet product performance requirements, and has excellent oil film stability, high temperature stability, lubricity, etc.

[0018] The antioxidant is a mixture of one or two components of alkyl diphenylamine and naphthylamine in any proportion, has good antioxidant performance, and can reduce the generation of piston ring deposits.

[0019] Metal passivator is a liquid methylbenzotriazole derivative that can form a protective film on the metal surface to prevent rust and corrosion, and also has certain wear reduction and anti-wear properties.

[0020] The ashless extreme pressure anti-wear agent is an ashless liquid dithiophosphate, which can exert better thermal stability in the polyether system, provide long-lasting anti-wear performance, is not easily decomposed and consumed, and exhibits good toughness.

[0021] The rust inhibitor is liquid alkenyl succinic acid half fat, which has good anti-rust and moisture-proof properties and can protect the alloy surface.

[0022] The antifoaming agent is a composite antifoaming agent that can take into account antifoaming properties, oil solubility, stability, etc., and has good compatibility with other additives.

[0023] The polyether high-pressure natural gas compressor cylinder oil composition of the present invention has the following specific embodiments:

[0024] Example 1

[0025] The polyether high-pressure natural gas compressor cylinder oil composition of the present invention has the following raw material proportions in Table 1:

[0026] Table 1 Raw material ratio of polyether high pressure natural gas compressor cylinder oil composition of Example 1

[0027] name quality% Polyether base oil 97.0 Alkyl diphenylamine 2.5 Liquid methylbenzotriazole derivatives 0.08 Ashless liquid dithiophosphate 0.1 Liquid alkenyl succinate hemiester 0.30 Composite antifoaming agent 0.02

[0028] Example 2

[0029] The polyether high-pressure natural gas compressor cylinder oil composition of the present invention has the following raw material proportions in Table 4:

[0030] Table 2 Raw material ratio of polyether high pressure natural gas compressor cylinder oil composition of Example 2

[0031]

[0032]

[0033] Example 3

[0034] The polyether high-pressure natural gas compressor cylinder oil composition of the present invention has the following raw material proportions in Table 1:

[0035] Table 3 Raw material ratio of polyether high pressure natural gas compressor cylinder oil composition of Example 3

[0036] name quality% Polyether base oil 98.5 Naphthylamine 1.0 Liquid methylbenzotriazole derivatives 0.05 Ashless liquid dithiophosphate 0.06 Liquid alkenyl succinate hemiester 0.37 Composite antifoaming agent 0.02

[0037] The performance test of the polyether high-pressure natural gas compressor cylinder oil composition prepared in this Example 3 is shown in Table 4 below.

[0038] Table 4 Performance data of polyether high pressure natural gas compressor cylinder oil composition of Example 1

[0039]

[0040]

[0041]

[0042] From the comparison of the data in Table 4, it can be seen that the polyether high-pressure natural gas compressor cylinder oil composition of the present invention has good viscosity-temperature properties, excellent antioxidant performance, a rotating oxygen bomb of more than 700 minutes, and outstanding anti-wear performance. Through quantitative comparison in the evaluation of the key performance "anti-alkane flushing ability", the polyether high-pressure natural gas compressor cylinder oil composition of the present invention is 13.8% higher than that of the competing products in this performance, and has excellent performance, which can meet the lubrication needs of the high-pressure natural gas compressor cylinder.

[0043] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A polyether high-pressure natural gas compressor cylinder oil composition, characterized in that: The composition includes the following components in terms of mass percentage: 96.0%-98.5% of polyether base oil, 1.5%-3.5% of antioxidant, 0.03%-0.1% of metal passivator, 0.05%-0.12% of ashless extreme pressure anti-wear agent, 0.08%-0.15% of rust inhibitor, and 0.005%-0.03% of anti-foaming agent. The sum of the mass percentages of the above components is 100%.

2. The polyether high-pressure natural gas compressor cylinder oil composition according to claim 1, characterized in that: The polyether base oil is composed of a mixture of ethylene oxide and propylene oxide, and the molar ratio of the ethylene oxide chain segments is 70% to 75%.

3. The polyether high-pressure natural gas compressor cylinder oil composition according to claim 1, characterized in that: The antioxidant is a mixture of one or two components of alkyl diphenylamine and naphthylamine in any proportion.

4. The polyether high-pressure natural gas compressor cylinder oil composition according to claim 1, characterized in that: The metal passivator is a liquid methylbenzotriazole derivative.

5. The polyether high-pressure natural gas compressor cylinder oil composition according to claim 1, characterized in that: The ashless extreme pressure anti-wear agent is an ashless liquid dithiophosphate.

6. The polyether high-pressure natural gas compressor cylinder oil composition according to claim 1, characterized in that: The rust inhibitor is liquid alkenyl succinic acid half fat.

7. The polyether high-pressure natural gas compressor cylinder oil composition according to claim 1, characterized in that: The antifoaming agent is a composite antifoaming agent.

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