Flame-resistant hydraulic oil composition as well as preparation method and application thereof

Abstract

The invention relates to the technical field of lubricating oil, in particular to a fire-resistant hydraulic oil composition as well as a preparation method and application thereof. The flame-resistant hydraulic oil composition provided by the invention is prepared from the following components in percentage by weight: 97.25 to 99.09 percent of trimethylolpropane oleate synthetic oil, 0.5 to 1.5 percent of an antioxidant, 0.05 to 0.1 percent of a metal deactivator, 0.3 to 1.0 percent of an extreme pressure anti-wear agent, 0.05 to 0.1 percent of an anti-rust agent and 0.01 to 0.05 percent of an anti-foaming agent. According to the invention, a mixture of 1-(3, 5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkylphenol is used as an antioxidant, so that the oxidation resistance is improved; a mixture of dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate is adopted as an extreme pressure anti-wear agent, so that the extreme pressure anti-wear property is improved, and the lubricating oil has the characteristics of non-flammability and small additive dosage.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils, and in particular to a fire-resistant hydraulic oil composition and a preparation method and application thereof. Background Art

[0002] Hydraulic oil is the most widely used type of industrial lubricant, accounting for 40-50% of industrial lubricants. Hydraulic oil is an important component of hydraulic technology, playing the role of lubrication and energy transmission. Hydraulic machinery is widely used in industries such as steel, coal, machinery, and mining. Hydraulic oil, as a power medium, is a key material in hydraulic transmission technology and one of the three most important oil products in industrial lubricant consumption. There are many hydraulic systems in the industry that are adjacent to high-temperature equipment. If the pipeline or hydraulic parts in the hydraulic system suddenly fail and cause hydraulic fluid leakage, the leaked hydraulic fluid will hit high-temperature parts or open flames, and there is a risk of combustion, resulting in a fire. In order to reduce the possibility of the above-mentioned fire, many measures are needed, one of which is to use flame-resistant hydraulic fluid.

[0003] Fire-resistant hydraulic fluids are mainly divided into mineral oil type, synthetic ester type, and water-based type according to their composition. Depending on their composition, the specific application conditions are also different. Mineral oil type is prone to ignition and safety accidents, and is recommended for use in places where the temperature is low and there is no open flame. Although water-based fire-resistant fluids can be used in open flames, their lubrication and rust prevention properties are poor, and they cause greater wear on the pump. They are not suitable for hydraulic systems with system working pressures higher than 16MPa. Synthetic ester type is the fastest-growing fire-resistant hydraulic oil, which is mainly divided into phosphate ester type and fatty acid ester type; among them, phosphate ester type fire-resistant fluids have the best flame retardant and wear resistance, and are widely used in most heavy-duty gas turbine (thermal) power plants and steel mills, but their hydrolysis products are highly toxic and pose a great threat to the environment.

[0004] The flame retardant performance of fatty acid ester type fire resistant hydraulic fluid is slightly inferior to that of phosphate ester, but it is environmentally friendly and has excellent comprehensive performance. Compared with general mineral oil type hydraulic fluid and water-ethylene glycol type fire resistant hydraulic fluid, fatty acid ester type fire resistant hydraulic fluid has excellent lubricity, wear resistance, high and low temperature stability, good flame resistance, good material compatibility, biodegradability and long service life, which can fully meet the requirements of ordinary hydraulic systems. However, when used in hydraulic systems operating under high temperature and long-term harsh working conditions such as power plants and steel plants, it is still difficult to meet the requirements of oxidation resistance and wear resistance. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a fire-resistant hydraulic oil composition and its preparation method and application. The fire-resistant hydraulic oil composition provided by the present invention is non-flammable, has good antioxidant performance and extreme pressure and anti-wear performance, and can meet the lubrication requirements of hydraulic systems in high-temperature, long-cycle and harsh working conditions such as power plants and steel plants.

[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 fire-resistant hydraulic oil composition, which comprises the following components by weight percentage: 97.25-99.09% of trimethylolpropane oleate synthetic oil, 0.5-1.5% of antioxidant, 0.05-0.1% of metal passivator, 0.3-1.0% of extreme pressure anti-wear agent, 0.05-0.1% of rust inhibitor, and 0.01-0.05% of anti-foaming agent;

[0008] The antioxidant includes 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol;

[0009] The extreme pressure anti-wear agent comprises dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate.

[0010] Preferably, the mass ratio of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol is (2-5):(1-3):(2-7).

[0011] Preferably, the alkyl diphenylamine comprises butyl octyl diphenylamine and / or p-2-diisooctyl diphenylamine;

[0012] The alkylphenol includes 2,6-di-tert-butyl-p-cresol and / or 4,4'-methylenebis(2,6-di-tert-butylphenol).

[0013] Preferably, the kinematic viscosity of the trimethylolpropane oleate synthetic oil at 40°C is 20 to 200 mm 2 / s.

[0014] Preferably, the metal deactivator comprises benzotriazole derivatives and / or thiadiazole derivatives.

[0015] Preferably, the mass ratio of the dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate is (1-2): (1-5): (1-3).

[0016] Preferably, the rust inhibitor comprises calcium dinonylnaphthalenesulfonate.

[0017] Preferably, the antifoaming agent is a mixture of a silicon-based antifoaming agent and a non-silicon-based antifoaming agent, and the mass ratio of the silicon-based antifoaming agent to the non-silicon-based antifoaming agent is (1-2): (1-2).

[0018] The present invention provides a method for preparing the fire-resistant hydraulic oil composition described in the above scheme, comprising the following steps: mixing trimethylolpropane oleate synthetic oil, an antioxidant, a metal passivator, an extreme pressure anti-wear agent, a rust inhibitor and an anti-foaming agent to obtain the fire-resistant hydraulic oil composition.

[0019] The present invention provides the use of the fire-resistant hydraulic oil composition described in the above scheme or the fire-resistant hydraulic oil composition prepared by the preparation method described in the above scheme in lubrication of a hydraulic system.

[0020] The invention provides a fire-resistant hydraulic oil, which comprises the following components in percentage by weight: 97.25-99.09% of trimethylolpropane oleate synthetic oil, 0.5-1.5% of antioxidant, 0.05-0.1% of metal passivator, 0.3-1.0% of extreme pressure anti-wear agent, 0.05-0.1% of rust inhibitor and 0.01-0.05% of anti-foam agent; the antioxidant comprises 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol; the extreme pressure anti-wear agent comprises dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate.

[0021] The invention adopts trimethylolpropane oleate synthetic oil as a base oil component. The synthetic oil has good viscosity-temperature performance and tribological performance, and also has excellent high-temperature performance and flame retardancy. The invention adopts 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol as antioxidants. The components have good positive synergistic effects with each other. Compared with commonly used antioxidants in traditional lubricating oils (such as 2,6-di-tert-butyl-p-cresol), the invention can greatly improve the antioxidant performance of the lubricating oil, solve the problem of insufficient natural antioxidant performance of trimethylolpropane oleate base oil, avoid premature oxidation and decay of the lubricating oil, and extend the oil change cycle and service life. The invention adopts a compound of dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate as an extreme pressure anti-wear agent, which can produce a good synergistic effect. On the basis of being conducive to improving the extreme pressure performance of the lubricating oil, the invention can also improve the corrosion resistance and anti-wear performance when using traditional active sulfur additives. The present invention introduces antioxidants, metal passivators, extreme pressure anti-wear agents, rust inhibitors and anti-foaming agents, and various functional additives. There are extremely complex interactions between different additives. The present invention controls the type and amount of each additive, so that the lubricating oil composition has excellent viscosity-temperature performance (viscosity index greater than 180), high temperature performance (autoignition point greater than 400°C) and low temperature performance (in the absence of pour point depressants, the pour point is lower than -39°C), and has good extreme pressure anti-wear performance and anti-foaming performance, and good anti-emulsification. The lubricating oil composition provided by the present invention can be used for lubrication of hydraulic systems with anti-flammability requirements, has reasonable raw material compatibility, simple preparation method, and wide application range.

[0022] In addition, the fire-resistant hydraulic oil composition provided by the present invention also has the characteristic of requiring a small amount of additives, which is beneficial for reducing oil costs. DETAILED DESCRIPTION

[0023] The invention provides a fire-resistant hydraulic oil, which comprises the following components in percentage by weight: 97.25-99.09% of trimethylolpropane oleate synthetic oil, 0.5-1.5% of antioxidant, 0.05-0.1% of metal passivator, 0.3-1.0% of extreme pressure anti-wear agent, 0.05-0.1% of rust inhibitor and 0.01-0.05% of anti-foam agent; the antioxidant comprises 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol; the extreme pressure anti-wear agent comprises dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate.

[0024] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0025] The fire-resistant hydraulic oil composition provided by the present invention comprises 97.25% to 99.09% of trimethylolpropane oleate synthetic oil by weight percentage, and in specific embodiments, it can be 97.25%, 97.5%, 98%, 98.5%, 99% or 99.09%. In the present invention, the kinematic viscosity of the trimethylolpropane oleate synthetic oil at 40°C is preferably 20 to 200 mm 2 / s, more preferably 30 to 100 mm 2 / s, more preferably 41.4 to 74.8 mm 2 / s; the trimethylolpropane oleate synthetic oil is preferably synthetic oil SDYZ-1 or synthetic oil SDYZ-2. In the embodiment of the present invention, the synthetic oil SDYZ-1 and synthetic oil SDYZ-2 are purchased from Nanjing Well Chemical Co., Ltd.

[0026] The fire-resistant hydraulic oil composition provided by the present invention includes 0.5-1.5% of antioxidant in terms of weight percentage, and in specific embodiments, it can be 0.5%, 0.6%, 0.8%, 1%, 1.2% or 1.5%. In the present invention, the antioxidant includes 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol; the mass ratio of the 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol is preferably (2-5):(1-3):(2-7), and in specific embodiments, the mass ratio of the 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol can be 2:1:2, 5:3:7 or 3:2:3.7.

[0027] In the present invention, the alkyl diphenylamine preferably includes butyl octyl diphenylamine and / or p-2-diisooctyl diphenylamine; the alkyl phenol preferably includes 2,6-di-tert-butyl-p-cresol and / or 4,4'-methylenebis(2,6-di-tert-butylphenol). In the present invention, the butyl octyl diphenylamine is preferably IRGANOXL57 of BASF, and the 2,6-di-tert-butyl-p-cresol is preferably T501 of Liaohe Petroleum Exploration Bureau Petrochemical General Plant. The present invention does not specifically limit the source of the 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, and it can be prepared by a method well known to those skilled in the art (such as the preparation method of Example 2 in CN200910117591.X A kind of antioxidant ionic liquid containing sterically hindered phenol and its preparation method and application). In the present invention, the structural formula of the 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate is as shown in Formula 1:

[0028]

[0029] The present invention adopts 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, butyloctyl diphenylamine and 2,6-di-tert-butyl-p-cresol as antioxidants, which can solve the problem of insufficient natural antioxidant performance of trimethylolpropane oleate synthetic base oil and prevent premature oxidation and decay of lubricating oil.

[0030] In terms of weight percentage, the fire-resistant hydraulic oil composition provided by the present invention includes 0.05-0.1% of a metal passivator, and in specific embodiments, it can be 0.05%, 0.06%, 0.07%, 0.08%, 0.09% or 0.1%. In the present invention, the metal passivator preferably includes a benzotriazole derivative and / or a thiadiazole derivative, more 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 the hydraulic system.

[0031] The fire-resistant hydraulic oil composition provided by the present invention comprises 0.3-1.0% of an extreme pressure anti-wear agent in terms of weight percentage, and in specific embodiments, it may be 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1.0%. In the present invention, the extreme pressure anti-wear agent comprises dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate; the mass ratio of the dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate is preferably (1-2): (1-5): (1-3), and in specific embodiments, it may be 1:1:1, 2:5:3, 1:1:2 or 2:3:2.

[0032] The present invention does not specifically limit the source of the dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, and can be prepared by a method well known to those skilled in the art (for details, please refer to Fan Mingjin, Yang Desuo, Wang Xiaoling, et al. DOSS-Based QAILs: As Both Neat Lubricants and Lubricant Additives with Excellent Tribological Properties and Good Detergency. Industrial & Engineering Chemistry Research, 2014, 53 (46): 17952-17960). The structural formula of the dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid is shown in Formula 2:

[0033]

[0034] In the present invention, the tricresyl phosphate is preferably T306 from Zibo Huihua Petroleum Additive Co., Ltd., and the tri-n-butyl thiophosphate is preferably JA89 from Taiyuan Anrun Petroleum Lubricant Additive Co., Ltd. The present invention adopts dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate as an extreme pressure anti-wear agent, and the components have a good positive synergistic effect with each other. Compared with sulfided isobutylene in traditional lubricating oil, the extreme pressure anti-wear performance of lubricating oil can be greatly improved, and the corrosion and wear problem caused by active sulfur is avoided, the contradiction between extreme pressure and corrosion resistance is solved, and the overall performance of lubricating oil is balanced; at the same time, the load-bearing capacity of lubricating oil can be improved, and the irritating odor problem is eliminated.

[0035] The fire-resistant hydraulic oil composition provided by the present invention includes 0.05-0.1% of a rust inhibitor in terms of weight percentage, and in specific embodiments, it may be 0.05%, 0.06%, 0.07%, 0.08%, 0.09% or 0.1%. In the present invention, the rust inhibitor preferably includes calcium dinonylnaphthalenesulfonate. In the present invention, the calcium dinonylnaphthalenesulfonate is preferably NA-SUL 729 from King Company. The present invention preferably uses calcium dinonylnaphthalenesulfonate as a rust inhibitor, which not only has good rust prevention performance, but also has a certain auxiliary anti-emulsification effect, and has good compatibility with other additives.

[0036] In terms of weight percentage, the fire-resistant hydraulic oil composition provided by the present invention includes 0.01-0.05% antifoaming agent, which may be 0.01%, 0.02%, 0.03%, 0.04% or 0.05% in a specific embodiment. In the present invention, the antifoaming agent is preferably a mixture of a silicon-type antifoaming agent and a non-silicon-type antifoaming agent, and the mass ratio of the silicon-type antifoaming agent and the non-silicon-type antifoaming agent is preferably (1-2): (1-2). In a specific embodiment, the mass ratio of the silicon-type antifoaming agent and the non-silicon-type antifoaming agent may be 1:1, 1:2 or 2:1. In the present invention, the silicon-type antifoaming agent is preferably polymethyl silicone oil; the non-silicon-type antifoaming agent is preferably polyacrylate. In the present invention, the silicon-type antifoaming agent polymethyl silicone oil is preferably T901 of Shanghai Shenpu Fine Chemical Factory, and the non-silicon-type antifoaming agent polyacrylate is preferably T912 of Shanghai Shenpu Fine Chemical Factory. The present invention limits the amount of the antifoaming agent to the above range, which can maintain certain foam properties and avoid dry friction caused by oil film destruction due to bubbles during use. At the same time, it can also avoid adding too much to affect the air release characteristics of the product.

[0037] The present invention provides a method for preparing the fire-resistant hydraulic oil composition described in the above scheme, comprising the following steps: mixing trimethylolpropane oleate synthetic oil, an antioxidant, a metal passivator, an extreme pressure anti-wear agent, a rust inhibitor and an anti-foaming agent to obtain the fire-resistant hydraulic oil composition.

[0038] The present invention preferably heats the trimethylolpropane oleate synthetic oil to 60-80° C., adds the antioxidant, metal passivator, extreme pressure anti-wear agent, rust inhibitor and anti-foaming agent to the trimethylolpropane oleate synthetic oil at 60-80° C. with stirring, continues stirring at 60-80° C. for 3-5 hours after the addition is completed, until the obtained mixture is uniform and transparent, and obtains the fire-resistant hydraulic oil composition after cooling.

[0039] The present invention provides the use of the fire-resistant hydraulic oil composition described in the above scheme or the fire-resistant hydraulic oil composition prepared by the preparation method described in the above scheme in lubrication of a hydraulic system.

[0040] The fire-resistant hydraulic oil composition provided by the present invention, its preparation method and application are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0041] Some of the raw materials involved in the following examples and comparative examples include:

[0042] Trimethylolpropane oleate synthetic oil SDYZ-1 was purchased from Nanjing Well Chemical Co., Ltd., with a kinematic viscosity of 47.61 mm at 40 °C. 2 / s;

[0043] Trimethylolpropane oleate synthetic oil SDYZ-2 was purchased from Nanjing Well Chemical Co., Ltd., with a kinematic viscosity of 68.55 mm at 40 °C. 2 / s;

[0044] Butyl octyl diphenylamine is IRGANO XL57 from BASF;

[0045] 2,6-di-tert-butyl-p-cresol was T501 from the Liaohe Petroleum Exploration Bureau Petrochemical General Plant;

[0046] N,N-dibutylaminomethylmethylenebenzotriazole is T551 from Changsha Wangcheng Petrochemical Co., Ltd.;

[0047] Tricresol phosphate was T306 from Zibo Huihua Petroleum Additives Co., Ltd.;

[0048] Tri-n-butyl thiophosphate is JA89 from Taiyuan Anrun Petroleum Additives Company;

[0049] Calcium dinonylnaphthalenesulfonate is NA-SUL 729 from King Company;

[0050] The silicone antifoaming agent polymethyl silicone oil is T901 from Shanghai Shenpu Fine Chemical Factory;

[0051] The non-silicone antifoaming agent polyacrylate is T912 from Shanghai Shenpu Fine Chemical Factory.

[0052] Example 1

[0053] Weigh 99.09g of trimethylolpropane oleate synthetic oil SDYZ-1, heat to 70±5°C and stir, then add 0.2g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, 0.1g of butyloctyl diphenylamine, 0.2g of 2,6-di-tert-butyl-p-cresol, 0.05g of N,N-dibutylaminomethylmethylenebenzotriazole, 0.1g of dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, 0.1g of tricresyl phosphate, 0.1g of tri-n-butylthiophosphate, 0.05g of calcium dinonylnaphthalenesulfonate, 0.005g of anti-foaming agent polymethyl silicone oil and 0.005g of anti-foaming agent polyacrylate, stir at 70±5°C for 3h, and cool to room temperature (25°C) to obtain a fire-resistant hydraulic oil composition.

[0054] Example 2

[0055] Weigh 97.25g of trimethylolpropane oleate synthetic oil SDYZ-1, heat to 70±5°C and stir, then add 0.5g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, 0.3g of butyloctyl diphenylamine, 0.7g of 2,6-di-tert-butyl-p-cresol, 0.1g of N,N-dibutylaminomethylmethylenebenzotriazole, 0.2g of dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, 0.5g of tricresyl phosphate, 0.3g of tri-n-butylthiophosphate, 0.1g of calcium dinonylnaphthalenesulfonate, 0.033g of anti-foaming agent polymethyl silicone oil and 0.017g of anti-foaming agent polyacrylate, stir at 70±5°C for 3h, and cool to room temperature (25°C) to obtain a fire-resistant hydraulic oil composition.

[0056] Example 3

[0057] Weigh 98.5g of trimethylolpropane oleate synthetic oil SDYZ-2, heat to 70±5℃ and stir, then add 0.3g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazole tetrafluoroborate, 0.2g of butyloctyl diphenylamine, 0.37g of 2,6-di-tert-butyl-p-cresol, 0.07g of N,N-dibutylaminomethylmethylenebenzotriazole, 0.15g of dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, 0.15g of tricresyl phosphate, 0.15g of tri-n-butylthiophosphate, 0.08g of calcium dinonylnaphthalenesulfonate, 0.02g of anti-foaming agent polymethyl silicone oil and 0.01g of anti-foaming agent polyacrylate, stir at 70±5℃ for 3h, and cool to room temperature (25℃) to obtain a fire-resistant hydraulic oil composition.

[0058] Comparative Example 1

[0059] A fire-resistant hydraulic oil composition was prepared according to Example 3, except that 0.3 g of 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, 0.2 g of butyloctyl diphenylamine and 0.37 g of 2,6-di-tert-butyl-p-cresol were replaced with 0.35 g of butyloctyl diphenylamine and 0.52 g of 2,6-di-tert-butyl-p-cresol.

[0060] Comparative Example 2

[0061] A fire-resistant hydraulic oil composition was prepared according to Example 3, except that 0.15 g of dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, 0.15 g of tricresyl phosphate and 0.15 g of tri-n-butyl thiophosphate were replaced with 0.23 g of tricresyl phosphate and 0.22 g of tri-n-butyl thiophosphate.

[0062] The performance of the fire-resistant hydraulic oils prepared in the examples and comparative examples was tested, and the results are shown in Table 1.

[0063] Table 1 Performance test results of the fire-resistant hydraulic oil compositions prepared in the examples and comparative examples

[0064]

[0065] As can be seen from Table 1, the fire-resistant hydraulic oil provided by the present invention has outstanding viscosity-temperature performance (viscosity index greater than 180), high temperature performance (autoignition point higher than 400°C) and low temperature performance (pour point lower than -39°C without adding pour point depressant), and has good anti-emulsification performance, extreme pressure anti-wear performance and anti-foaming performance. At the same time, compared with Comparative Example 1, the fire-resistant hydraulic oil prepared in Example 3 has excellent antioxidant properties, indicating that the present invention uses 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazole tetrafluoroborate, butyl octyl diphenylamine and 2,6-di-tert-butyl-p-cresol to produce a good positive synergistic effect, which is beneficial to improving the antioxidant properties of the lubricating oil, solving the problem of insufficient natural antioxidant properties of trimethylolpropane oleate synthetic base oil, and avoiding premature oxidation and decay of the lubricating oil; compared with Comparative Example 2, the fire-resistant hydraulic oil prepared in Example 3 has excellent extreme pressure and anti-wear properties, indicating that the present invention uses dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate to produce a good synergistic effect. On the basis of being beneficial to improving the extreme pressure performance of the lubricating oil, it can also improve the corrosion resistance and anti-wear properties when using traditional active sulfur additives.

[0066] 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 fire-resistant hydraulic oil composition, characterized in that: The composition comprises the following components by weight percentage: 97.25-99.09% of trimethylolpropane oleate synthetic oil, 0.5-1.5% of antioxidant, 0.05-0.1% of metal passivator, 0.3-1.0% of extreme pressure anti-wear agent, 0.05-0.1% of rust inhibitor, and 0.01-0.05% of anti-foaming agent; The antioxidant includes 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol; The extreme pressure anti-wear agent comprises dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate.

2. The fire-resistant hydraulic oil composition according to claim 1, characterized in that: The mass ratio of the 1-(3,5-di-tert-butyl-4-hydroxybenzyl)-3-methylimidazolium tetrafluoroborate, alkyl diphenylamine and alkyl phenol is (2-5): (1-3): (2-7).

3. The fire-resistant hydraulic oil composition according to claim 1 or 2, characterized in that: The alkyl diphenylamine includes butyl octyl diphenylamine and / or p-2-diisooctyl diphenylamine; The alkylphenol includes 2,6-di-tert-butyl-p-cresol and / or 4,4'-methylenebis(2,6-di-tert-butylphenol).

4. The fire-resistant hydraulic oil composition according to claim 1, characterized in that: The kinematic viscosity of the trimethylolpropane oleate synthetic oil at 40°C is 20 to 200 mm 2 / s.

5. The fire-resistant hydraulic oil composition according to claim 1, characterized in that: The metal deactivator includes benzotriazole derivatives and / or thiadiazole derivatives.

6. The fire-resistant hydraulic oil composition according to claim 1, characterized in that: The mass ratio of the dimethyl hexadecyl quaternary ammonium salt docusate ionic liquid, tricresyl phosphate and tri-n-butyl thiophosphate is (1-2): (1-5): (1-3).

7. The fire-resistant hydraulic oil composition according to claim 1, characterized in that: The rust inhibitor includes calcium dinonylnaphthalenesulfonate.

8. The fire-resistant hydraulic oil composition according to claim 1, characterized in that: The antifoaming agent is a mixture of a silicon-based antifoaming agent and a non-silicon-based antifoaming agent, and the mass ratio of the silicon-based antifoaming agent to the non-silicon-based antifoaming agent is (1-2): (1-2).

9. The method for preparing the fire-resistant hydraulic oil composition according to any one of claims 1 to 8, comprising the following steps: The fire-resistant hydraulic oil composition is obtained by mixing trimethylolpropane oleate synthetic oil, an antioxidant, a metal passivator, an extreme pressure anti-wear agent, a rust inhibitor and an anti-foaming agent.

10. Use of the fire-resistant hydraulic oil composition according to any one of claims 1 to 8 or the fire-resistant hydraulic oil composition prepared by the preparation method according to claim 9 in lubrication of hydraulic systems.

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