Compressor oil composition and preparation method thereof

Abstract

The invention relates to the field of lubricating oil, in particular to a compressor oil composition which is prepared from the following components in parts by weight: 0.005 to 0.2 part of an anti-rust agent, 0.05 to 1 part of an extreme pressure anti-wear agent, 0.01 to 0.5 part of a friction reducing agent, 3 to 8 parts of synthetic ester, 0.01 to 1 part of an antioxidant, 0.001 to 0.1 part of an anti-foaming agent and 90 to 97 parts of base oil. The anti-friction agent is a trimethylolpropane-triacid ester derivative, the anti-rust agent is formed by mixing an alkenyl succinic acid half-ester derivative and a carboxyl imidazoline derivative, and the anti-wear reagent at extreme pressure is formed by mixing triphenyl phosphate and an alkyl thiophosphate derivative. The antioxidant is formed by mixing any two of alkyl diphenylamine, alkyl phenyl-alpha-naphthylamine and alkyl hindered phenol. The invention further relates to a preparation method of the compressor oil composition. The compressor oil composition provided by the invention has excellent washing resistance and rust resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lubricating oil, in particular to a compressor oil composition and a preparation method thereof. BACKGROUND

[0002] On a diesel engine ship, an air compressor is an important marine auxiliary machine. Compressor oil is an important component of the air compressor and plays a role in lubrication, cooling, etc. Since the marine air compressor is used in a humid environment for a long time, the equipment is mainly used in marine or very humid working conditions, so that the equipment lubrication system is prone to water ingress. Under such harsh environmental conditions, the compressor oil not only needs to have excellent wear resistance, but also needs to have excellent water washing rust prevention performance.

[0003] Currently, the commonly used rust inhibitor is mainly for ordinary working environments and has not been improved for the special working conditions of marine compressors, so the water washing rust prevention performance of the compressor oil is not obviously improved. SUMMARY

[0004] In order to improve the water washing rust resistance of the compressor oil, the present application provides a compressor oil composition and a preparation method thereof. The present application adopts the following technical scheme:

[0005] In a first aspect, the present application relates to a compressor oil composition, which comprises 0.005-0.2 parts by weight of a rust inhibitor, 0.05-1 parts by weight of an extreme pressure anti-wear agent, 0.01-0.5 parts by weight of a friction-reducing agent, 3-8 parts by weight of a synthetic ester, 0.01-1 parts by weight of an antioxidant, 0.001-0.1 parts by weight of an antifoaming agent, and 90-97 parts by weight of a base oil.

[0006] The friction-reducing agent is a trimethylolpropane-trioic acid ester derivative, and the molecular structure formula of the trimethylolpropane-trioic acid ester derivative is:

[0007] wherein n = 1 or 2.

[0008] In a specific embodiment, as an option, the rust inhibitor is formed by mixing an alkenyl succinic acid half-ester derivative and a carboxy imidazoline derivative;

[0009] In the rust inhibitor, the weight ratio of the alkenyl succinic acid half-ester derivative to the carboxy imidazoline derivative is 1:1-1:5.

[0010] In a specific embodiment, as an option, the extreme pressure anti-wear agent is formed by mixing triphenyl phosphate and an alkyl thiophosphate derivative;

[0011] In the extreme pressure anti-wear agent, the weight ratio of triphenyl phosphate to the alkyl thiophosphate derivative is 1:1-5:1.

[0012] In the specific embodiment, as an option, the antioxidant is mixed from any two of the alkyl diphenylamine, the alkyl phenyl-alpha-naphthylamine and the alkyl hindered phenol.

[0013] In the specific embodiment, as an option, the antioxidant is mixed from the alkyl diphenylamine and the alkyl phenyl-alpha-naphthylamine in a ratio of 1:0.5-1:2; or

[0014] the alkyl diphenylamine and the alkyl hindered phenol in a ratio of 1:1-5:1; or

[0015] the alkyl phenyl-alpha-naphthylamine and the alkyl hindered phenol in a ratio of 1:1-5:1.

[0016] In the specific embodiment, as an option, the synthetic ester is dioctyl adipate or dioctyl phthalate.

[0017] In the specific embodiment, as an option, the anti-foaming agent is methyl siloxane and / or polymethacrylate.

[0018] In the specific embodiment, as an option, the anti-foaming agent is methyl siloxane and / or polymethacrylate.

[0019] In the specific embodiment, as an option, the base oil is a product obtained by first subjecting paraffin-based crude oil, intermediate-based crude oil or naphthenic-based crude oil to vacuum distillation and then to a hydrogenation process.

[0020] In the second aspect, the present application relates to a preparation method of the compressor oil composition, comprising:

[0021] The base oil is first heated to 60-70°C, and then the synthetic ester, the antioxidant, the extreme pressure anti-wear agent, the friction-reducing agent, the anti-rust agent and the anti-foaming agent are sequentially added to the base oil, stirred uniformly, and kept at 60-70°C for 1-2 hours to obtain a semi-finished product of the compressor oil, which is then cooled to 40-45°C, filtered, and finally naturally cooled to obtain the compressor oil composition.

[0022] In summary, the present application has the following advantages over the prior art:

[0023] The present application adopts trimethylolpropane-trioic acid ester derivative as a friction reducer, reasonably collocates the friction reducer with extreme pressure anti-wear agent and rust inhibitor, improves the anti-wear property while maintaining excellent water washing rust resistance, and solves the problem of the antagonism of the extreme pressure anti-wear agent, the friction reducer and the rust inhibitor. The compressor oil composition prepared in the present application has a wear scar diameter of not more than 0.6 mm tested by a four-ball wear tester, a total weight loss of not more than 100 mg tested by a Vickers 104C vane pump, and a corrosion test rating of not more than 1, and the water washing rust test results are all qualified. DETAILED DESCRIPTION

[0024] The inventor prepared a compressor lubricating oil according to the Chinese patent with publication number CN1982423A, mixed the compressor lubricating oil with distilled water, stirred for 0.5 h to fully mix the two, and then separated the water. Then, the water-washed compressor lubricating oil was subjected to a liquid phase rust test according to GB / T11143, synthetic seawater was added to the compressor lubricating oil and stirred for 24 h to investigate the rusting of the steel rod immersed in the oil. It was found through the test that the steel rod rusted, and the water washing rust test result of the compressor lubricating oil was unqualified.

[0025] The inventor further prepared a compressor lubricating oil composition according to the Chinese patent with publication number CN202210960203A. First, the compressor lubricating oil was subjected to a liquid phase rust test according to GB / T11143, and the test result was qualified. Then, the inventor subjected the compressor lubricating oil to a water washing rust test. It was found through the test that the steel rod rusted, and the water washing rust test result of the compressor lubricating oil composition was unqualified.

[0026] In summary, the inventor found that in air compressors for ships, the compressor oil needs to have excellent anti-wear property as well as excellent water washing rust resistance. However, the current compressor oil compositions usually have poor water washing rust resistance.

[0027] Based on the above findings, the inventor further developed the present application.

[0028] The present application is described in detail below through specific examples:

[0029] (1) Preparation of the compressor oil composition

[0030] Example 1

[0031] The compressor oil composition in this example includes the following components in parts by weight: 96.4 parts of base oil, 3 parts of synthetic ester, 0.08 parts of rust inhibitor, 0.2 parts of extreme pressure anti-wear agent, 0.01 parts of friction reducer, 0.3 parts of antioxidant and 0.01 parts of antifoaming agent.

[0032] The base oil in the embodiment is a product obtained by first subjecting paraffin-based crude oil to vacuum distillation and then subjecting the product to a hydrogenation process. The base oil has a kinematic viscosity of 120 mm 2 / s~185 mm 2 / s at 40℃, an acid value of 0.001 mgKOH / g~0.01 mgKOH / g, a pour point of not higher than -9℃, and an open flash point of not lower than 170℃.

[0033] In the embodiment, the synthetic ester is dioctyl phthalate, the rust inhibitor is a mixture of an alkenyl succinic acid half-ester derivative and a carboxy imidazoline derivative at a weight ratio of 1:3, the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and an alkyl thiophosphate derivative at a weight ratio of 1:1, the friction-reducing agent is a trimethylolpropane-trioic acid ester derivative, the antioxidant is a mixture of an alkyl diphenylamine and an alkyl phenyl-α-naphthylamine at a weight ratio of 2:1, and the antifoaming agent is a polymethacrylate.

[0034] In the embodiment, the trimethylolpropane-trioic acid ester derivative has the following molecular structure:

[0035] In the embodiment, n=1.

[0036] The compressor oil composition in the embodiment is prepared according to the following process:

[0037] The base oil is added into a reaction kettle, the reaction kettle is heated to 60℃~70℃, and then the synthetic ester, the antioxidant, the extreme pressure anti-wear agent, the friction-reducing agent, the rust inhibitor, and the antifoaming agent are sequentially added into the reaction kettle, the mixture is stirred for 2 hours by pulse stirring, and the mixture is kept at 60℃~70℃ for 1~2 hours to obtain a semi-finished product of the compressor oil. The semi-finished product of the compressor oil is cooled to 40℃~45℃, filtered, and then naturally cooled to room temperature to obtain the compressor oil composition.

[0038] Example 2

[0039] The difference between the embodiment and Example 1 is that the composition of the compressor oil composition is different, and the preparation process is the same.

[0040] The compressor oil composition in the embodiment includes the following components in parts by weight: 95.21 parts of the base oil, 4 parts of the synthetic ester, 0.06 parts of the rust inhibitor, 0.3 parts of the extreme pressure anti-wear agent, 0.02 parts of the friction-reducing agent, 0.4 parts of the antioxidant, and 0.01 parts of the antifoaming agent.

[0041] The base oil in the embodiment is a product obtained by first subjecting intermediate-based crude oil to vacuum distillation and then subjecting the product to a hydrogenation process.

[0042] In this embodiment, the synthetic ester is dioctyl adipate; the rust inhibitor is a mixture of alkenyl succinic acid half-ester derivative and carboxy imidazoline derivative in a weight ratio of 1:5; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative in a weight ratio of 2:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl diphenylamine and alkyl hindered phenol in a weight ratio of 3:1; and the antifoam agent is methyl silicane.

[0043] In this embodiment, the trimethylolpropane-trioic acid ester derivative has the following molecular structure:

[0044] wherein n = 2.

[0045] Example 3

[0046] This embodiment differs from Example 1 in that the composition of the compressor oil composition is different, and the preparation process is the same.

[0047] The compressor oil composition in this embodiment includes, in parts by weight, the following components: 93.68 parts of base oil, 5 parts of synthetic ester, 0.06 parts of rust inhibitor, 0.6 parts of extreme pressure anti-wear agent, 0.2 parts of friction-reducing agent, 0.45 parts of antioxidant, and 0.01 parts of antifoam agent.

[0048] The base oil in this embodiment is a product obtained by first subjecting naphthenic base crude oil to vacuum distillation and then subjecting the product to a hydrogenation process.

[0049] In this embodiment, the synthetic ester is dioctyl adipate; the rust inhibitor is a mixture of alkenyl succinic acid half-ester derivative and carboxy imidazoline derivative in a weight ratio of 1:1; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative in a weight ratio of 5:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl diphenylamine and alkyl phenyl-α-naphthylamine in a weight ratio of 2:1; and the antifoam agent is polymethacrylate.

[0050] In this embodiment, the trimethylolpropane-trioic acid ester derivative has the following molecular structure:

[0051] wherein n = 1.

[0052] Example 4

[0053] This embodiment differs from Example 1 in that the composition of the compressor oil composition is different, and the preparation process is the same.

[0054] The compressor oil composition in the embodiment comprises the following components in parts by weight: 91.41 parts of base oil, 8 parts of synthetic ester, 0.05 parts of anti-rust agent, 0.4 parts of extreme pressure anti-wear agent, 0.01 parts of friction-reducing agent, 0.12 parts of antioxidant, and 0.01 parts of anti-foaming agent.

[0055] In the embodiment, the synthetic ester is dioctyl adipate; the anti-rust agent is a mixture of alkenyl succinic acid half-ester derivative and carboxy imidazoline derivative at a weight ratio of 1:4; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative at a weight ratio of 3:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl diphenylamine and alkyl hindered phenol at a weight ratio of 5:1; and the anti-foaming agent is polymethyl acrylate.

[0056] In the embodiment, the trimethylolpropane-trioic acid ester derivative has the following molecular structural formula:

[0057] wherein n = 1.

[0058] Example 5

[0059] The embodiment differs from Example 1 in that the composition of the compressor oil composition is different, and the preparation process is the same.

[0060] The compressor oil composition in the embodiment comprises the following components in parts by weight: 94.02 parts of base oil, 5 parts of synthetic ester, 0.06 parts of anti-rust agent, 0.3 parts of extreme pressure anti-wear agent, 0.01 parts of friction-reducing agent, 0.6 parts of antioxidant, and 0.01 parts of anti-foaming agent.

[0061] In the embodiment, the synthetic ester is dioctyl phthalate; the anti-rust agent is a mixture of alkenyl succinic acid half-ester derivative and carboxy imidazoline derivative at a weight ratio of 1:2; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative at a weight ratio of 5:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl phenyl-α-naphthylamine and alkyl hindered phenol at a weight ratio of 5:1; and the anti-foaming agent is methyl siloxane.

[0062] In the embodiment, the trimethylolpropane-trioic acid ester derivative has the following molecular structural formula:

[0063] wherein n = 2.

[0064] Example 6

[0065] The embodiment differs from Example 1 in that the composition of the compressor oil composition is different, and the preparation process is the same.

[0066] The compressor oil composition in the embodiment comprises the following components in parts by weight: 92.84 parts of base oil, 6 parts of synthetic ester, 0.15 parts of anti-rust agent, 0.65 parts of extreme pressure anti-wear agent, 0.05 parts of friction-reducing agent, 0.3 parts of antioxidant, and 0.01 parts of anti-foaming agent.

[0067] In the embodiment, the synthetic ester is dioctyl adipate; the anti-rust agent is a mixture of alkenyl succinic half-ester derivative and carboxy imidazoline derivative at a weight ratio of 1:2; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative at a weight ratio of 4:2.5; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl diphenylamine and alkyl phenyl-α-naphthylamine at a weight ratio of 1:2; and the anti-foaming agent is polymethacrylate.

[0068] In the embodiment, the trimethylolpropane-trioic acid ester derivative has the following molecular structural formula:

[0069] In the embodiment, n = 2.

[0070] Example 7

[0071] The difference between the embodiment and Example 1 is that the composition of the compressor oil composition is different, and the preparation process is the same.

[0072] The compressor oil composition in the embodiment comprises the following components in parts by weight: 94.299 parts of base oil, 3 parts of synthetic ester, 0.2 parts of anti-rust agent, 1 part of extreme pressure anti-wear agent, 0.5 parts of friction-reducing agent, 1 part of antioxidant, and 0.001 parts of anti-foaming agent.

[0073] In the embodiment, the synthetic ester is dioctyl adipate; the anti-rust agent is a mixture of alkenyl succinic half-ester derivative and carboxy imidazoline derivative at a weight ratio of 1:3; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative at a weight ratio of 5:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl diphenylamine and alkyl phenyl-α-naphthylamine at a weight ratio of 1:0.5; and the anti-foaming agent is polymethacrylate.

[0074] In the embodiment, the trimethylolpropane-trioic acid ester derivative has the following molecular structural formula:

[0075] In the embodiment, n = 1.

[0076] Example 8

[0077] The difference between the embodiment and Example 1 is that the composition of the compressor oil composition is different, and the preparation process is the same.

[0078] The compressor oil composition in the embodiment comprises the following components in parts by weight: 91.63 parts of base oil, 8 parts of synthetic ester, 0.005 parts of anti-rust agent, 0.05 parts of extreme pressure anti-wear agent, 0.3 parts of friction-reducing agent, 0.01 parts of antioxidant, and 0.005 parts of anti-foaming agent.

[0079] In the embodiment, the synthetic ester is dioctyl phthalate; the anti-rust agent is a mixture of alkenyl succinic acid half-ester derivative and carboxy imidazoline derivative at a weight ratio of 1:4; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative at a weight ratio of 4:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl hindered phenol and alkyl diphenylamine at a weight ratio of 1:4; and the anti-foaming agent is polymethacrylate.

[0080] In the embodiment, the molecular structural formula of the trimethylolpropane-trioic acid ester derivative is as follows:

[0081] wherein n = 1.

[0082] Comparative Example 1

[0083] The difference between the comparative example and Example 1 is that the compositions of the compressor oil compositions are different, and the preparation processes are the same.

[0084] The compressor oil composition in the comparative example comprises the following components in parts by weight: 95.435 parts of base oil, 4 parts of synthetic ester, 0.06 parts of anti-rust agent, 0.35 parts of extreme pressure anti-wear agent, 0.005 parts of friction-reducing agent, 0.14 parts of antioxidant, and 0.01 parts of anti-foaming agent.

[0085] In the comparative example, the synthetic ester is dioctyl phthalate; the anti-rust agent is a mixture of alkenyl succinic acid half-ester derivative and carboxy imidazoline derivative at a weight ratio of 1:1; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative at a weight ratio of 2.5:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl diphenylamine and alkyl phenyl-α-naphthylamine at a weight ratio of 1:2.5; and the anti-foaming agent is polymethacrylate.

[0086] In the comparative example, the molecular structural formula of the trimethylolpropane-trioic acid ester derivative is as follows:

[0087] wherein n = 1.

[0088] Comparative Example 2

[0089] The difference between the comparative example and Example 1 is that the compositions of the compressor oil compositions are different, and the preparation processes are the same.

[0090] The compressor oil composition in the present comparative example comprises the following components in parts by weight: 95.44 parts of base oil, 3 parts of synthetic ester, 0.05 parts of anti-rust agent, 0.4 parts of extreme pressure anti-wear agent, 0.6 parts of friction-reducing agent, 0.5 parts of antioxidant, and 0.01 parts of anti-foaming agent.

[0091] In the present comparative example, the synthetic ester is dioctyl adipate; the anti-rust agent is a mixture of alkenyl succinic half-ester derivative and carboxy imidazoline derivative at a weight ratio of 1:4; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative at a weight ratio of 3:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl diphenylamine and alkyl hindered phenol at a weight ratio of 4:1; and the anti-foaming agent is methyl silicone.

[0092] In the present comparative example, the molecular structural formula of the trimethylolpropane-trioic acid ester derivative is as follows:

[0093] wherein n = 2.

[0094] Comparative Example 3

[0095] The present comparative example differs from Example 1 in that the composition of the compressor oil composition is different, and the preparation process is the same.

[0096] The compressor oil composition in the present comparative example comprises the following components in parts by weight: 93.59 parts of base oil, 4 parts of synthetic ester, 0.004 parts of anti-rust agent, 1.2 parts of extreme pressure anti-wear agent, 0.4 parts of friction-reducing agent, 0.8 parts of antioxidant, and 0.006 parts of anti-foaming agent.

[0097] In the present comparative example, the synthetic ester is dioctyl adipate; the anti-rust agent is a mixture of alkenyl succinic half-ester derivative and carboxy imidazoline derivative at a weight ratio of 1:3; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative at a weight ratio of 5:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl diphenylamine and alkyl hindered phenol at a weight ratio of 3:1; and the anti-foaming agent is methyl silicone.

[0098] In the present comparative example, the molecular structural formula of the trimethylolpropane-trioic acid ester derivative is as follows:

[0099] wherein n = 2.

[0100] Comparative Example 4

[0101] The present comparative example differs from Example 1 in that the composition of the compressor oil composition is different, and the preparation process is the same.

[0102] The compressor oil composition in the present comparative example comprises the following components in parts by weight: 94.1 parts of base oil, 5 parts of synthetic ester, 0.3 parts of anti-rust agent, 0.04 parts of extreme pressure anti-wear agent, 0.5 parts of friction-reducing agent, 0.05 parts of antioxidant, and 0.01 parts of anti-foaming agent.

[0103] In the present comparative example, the synthetic ester is dioctyl phthalate; the anti-rust agent is a mixture of alkenyl succinic half ester derivative and carboxy imidazoline derivative in a weight ratio of 1:2; the extreme pressure anti-wear agent is a mixture of triphenyl phosphate and alkyl thiophosphate derivative in a weight ratio of 1:1; the friction-reducing agent is trimethylolpropane-trioic acid ester derivative; the antioxidant is a mixture of alkyl diphenylamine and alkyl hindered phenol in a weight ratio of 4:1; and the anti-foaming agent is methyl silicone.

[0104] In the present comparative example, the trimethylolpropane-trioic acid ester derivative has the following molecular structure:

[0105] wherein n = 2.

[0106] (2) Performance test of the compressor oil composition

[0107] Anti-wear test: the anti-wear ability of the compressor oil compositions in Examples 1-8 and Comparative Examples 1-4 was tested according to SH / T 0189-92 at 392 N, 60 min, 75°C, 1200 r / min, and the size of the wear scar diameter was determined.

[0108] Wear test: the wear test of the compressor oil compositions in Examples 1-8 and Comparative Examples 1-4 was carried out according to JB / T 7040-1993, and the total weight loss was determined after 100 h of testing.

[0109] Corrosion test: the corrosion test of the compressor oil compositions in Examples 1-8 and Comparative Examples 1-4 was carried out according to GB / T 19291-2003, and the rating was determined after 24 h at 70±2°C.

[0110] Water-washing rust test: the compressor oil compositions in Examples 1-8 and Comparative Examples 1-4 were mixed with distilled water and stirred for 0.5 h to fully mix the two, and then the water was separated. The water-washed compressor oil composition was then added with synthetic seawater and stirred for 24 h according to the liquid rust test method, and the rusting of the steel rod immersed in the oil was observed.

[0111] The test results are shown in the following table.

[0112] Table 1 Test results of the compressor oil compositions in Examples 1-8 and Comparative Examples 1-4

[0113]

[0114] As can be seen from Table 1, the compressor oil compositions prepared in Examples 1-8 can meet the requirements of GB / T12691-2021, and the wear scar diameters tested by the four-ball wear tester are not greater than 0.6 mm, the total weight loss tested by the Vickers 104C vane pump is not greater than 100 mg, and the corrosion test rating is not greater than 1, and the water washing rust test results are all qualified.

[0115] Further, as can be seen from Table 1, the wear scar diameter and total weight loss of the compressor oil composition in Example 3 are the smallest, and the corrosion test rating reaches 1a, which is further superior to other examples.

[0116] As can be seen from Comparative Example 1, when the weight fraction of the friction-reducing agent in the compressor oil composition is less than 0.01 parts, the wear scar diameter tested by the four-ball wear tester will increase to more than 0.6 mm, and the total weight loss tested by the Vickers 104C vane pump will also be more than 100 mg, and the water washing rust test is unqualified, which cannot achieve the expected effect. As can be seen from Comparative Example 2, when the weight fraction of the friction-reducing agent in the compressor oil composition is greater than 0.5 parts, although the wear scar diameter and total weight loss can meet the requirements, the water washing rust test is still unqualified. Therefore, the inventors determine the weight fraction of the friction-reducing agent to be 0.01-0.5 parts.

[0117] As can be seen from Comparative Example 3 and Comparative Example 4, when the weight fraction of the extreme pressure anti-wear agent in the compressor oil composition is less than 0.05 parts, and the weight fraction of the rust inhibitor is greater than 0.2 parts, or the weight fraction of the extreme pressure anti-wear agent is greater than 1 part, and the weight fraction of the rust inhibitor is less than 0.005 parts, the water washing rust test is unqualified, and the wear scar diameter and total weight loss will exceed the target value. Therefore, the inventors determine the weight fraction of the extreme pressure anti-wear agent to be 0.05-1 parts, and the weight fraction of the rust inhibitor to be 0.005-0.2 parts.

[0118] In summary, the inventors reasonably match the friction-reducing agent, the extreme pressure anti-wear agent, and the rust inhibitor, reduce the friction of the parts, improve the anti-wear property of the compressor oil composition, and at the same time, maintain excellent water washing rust resistance.

[0119] The above description includes examples of one or more embodiments. Of course, not all possible combinations of components or methods described above can be claimed as an embodiment, but one of ordinary skill in the art will recognize that further combinations and permutations of the embodiments described herein are possible. Therefore, the description herein is intended to cover all such modification and variations as are within the scope of the appended claims. Further, the use of the term "comprising" in the description or claims is not intended to exclude any embodiments except those claimed in the claims. In addition, the use of the term "or" is intended to mean "and / or" unless otherwise indicated.

Claims

1. A compressor oil composition characterized in that, 0.005-0.2 parts of a rust inhibitor, 0.05-1 parts of an extreme pressure anti-wear agent, 0.01-0.5 parts of a friction-reducing agent, 3-8 parts of a synthetic ester, 0.01-1 parts of an antioxidant, 0.001-0.1 parts of an antifoaming agent and 90-97 parts of a base oil, by weight; The friction-reducing agent is a trimethylolpropane-trioic acid ester derivative, and the molecular structural formula of the trimethylolpropane-trioic acid ester derivative is: wherein n = 1 or 2.

2. The compressor oil composition of claim 1, wherein The rust inhibitor is a mixture of an alkenyl succinic acid half ester derivative and a carboxy imidazoline derivative. In the rust inhibitor, the weight ratio of the alkenyl succinic acid half ester derivative to the carboxy imidazoline derivative is 1:1-1:

5.

3. The compressor oil composition of claim 1, wherein The extreme pressure anti-wear agent is a mixture of triphenyl phosphate and an alkyl thiophosphate derivative. In the extreme pressure anti-wear agent, the weight ratio of triphenyl phosphate to the alkyl thiophosphate derivative is 1:1-5:

1.

4. The compressor oil composition of claim 1, wherein The antioxidant is a mixture of any two of an alkyl diphenylamine, an alkyl phenyl-alpha-naphthylamine and an alkyl hindered phenol.

5. The compressor oil composition of claim 4, wherein The antioxidant is a mixture of the alkyl diphenylamine and the alkyl phenyl-alpha-naphthylamine in a ratio of 1:0.5-1:2; or The antioxidant is a mixture of the alkyl diphenylamine and the alkyl hindered phenol in a ratio of 1:1-5:1; or The antioxidant is a mixture of the alkyl phenyl-alpha-naphthylamine and the alkyl hindered phenol in a ratio of 1:1-5:

1.

6. The compressor oil composition of claim 1, wherein The synthetic ester is dioctyl adipate or dioctyl phthalate.

7. The compressor oil composition of claim 1, wherein The antifoaming agent is methyl siloxane and / or polymethacrylate.

8. The compressor oil composition of claim 1, wherein 0.05-0.06 parts of a rust inhibitor, 0.4-0.6 parts of an extreme pressure anti-wear agent, 0.01-0.2 parts of a friction-reducing agent, 5-8 parts of a synthetic ester, 0.12-0.45 parts of an antioxidant, 0.01 parts of an antifoaming agent and 91.41-93.68 parts of a base oil, by weight.

9. The compressor oil composition of claim 1, wherein, The base oil is a product obtained by first subjecting paraffin-based crude oil, intermediate-based crude oil or naphthenic-based crude oil to vacuum distillation and then subjecting the product to a hydrogenation process.

10. The method of producing the compressor oil composition according to any one of claims 1 to 9, characterized by, The method comprises the following steps: The base oil is first heated to 60-70 DEG C, and then the synthetic ester, the antioxidant, the extreme pressure anti-wear agent, the friction-reducing agent, the rust inhibitor and the antifoaming agent are sequentially added to the base oil, stirred uniformly, and kept at 60-70 DEG C for 1-2 hours to obtain a semi-finished compressor oil, which is then cooled to 40-45 DEG C, filtered and naturally cooled to obtain the compressor oil composition.

Images