Flame retardant hydraulic fluid and method of making same

Abstract

The application discloses a kind of fire-resistant hydraulic fluid and preparation method thereof, the mass percentage of each raw material component of the hydraulic fluid is as follows: ethylene glycol 42-45%, extreme pressure lubricant 0.15-2%, extreme pressure antiwear agent 0.2-3%, antioxidant 0.1-2%, metal passivator 0.05-0.1%, defoaming agent 0.005-0.01%, tackifier 8-12%, and the balance is deionized water;Among them, the extreme pressure lubricant is triazine derivative, the triazine derivative is 6-ethyl sulfonamide acid group-2,4-bis (sodium sulfonate group) -1,3,5-triazine;The extreme pressure antiwear agent is the ionic liquid of 1-acetic acid ethyl ester group-3-methyl imidazole lactic acid salt.The application is compounded by extreme pressure antiwear agent, extreme pressure lubricant, antioxidant, defoaming agent, tackifier and ethylene glycol, deionized water, to form fire-resistant hydraulic fluid with excellent wear resistance, lubricity, antifoaming property, antioxidant property and oxidation stability, when high heat or open flame is generated in the friction process of the hydraulic fluid, deionized water is evaporated to isolate air, and excellent fire-retardant effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hydraulic fluid, and particularly relates to a fire-resistant hydraulic fluid and a preparation method thereof. BACKGROUND

[0002] Hydraulic machinery has been widely used in metallurgy, coal, machinery and mining industries, as a power transmission carrier of hydraulic fluid is the key material of hydraulic transmission technology, and is one of the three important oil products with the largest consumption of industrial lubricating oil. The hydraulic fluid is generally based on mineral oil, but in the high temperature, high pressure or near open flame of the hydraulic equipment in the metallurgy, hot processing, coal mining and other industries, if the mineral oil type hydraulic fluid is used, the fire may be caused due to the oil leakage, in order to prevent the oil leakage to cause the fire, the fire-resistant hydraulic medium, i.e. the fire-resistant hydraulic fluid, is required to be used in the hydraulic equipment in these occasions.

[0003] Water-glycol type fire resistant hydraulic fluid (HFC type fire resistant hydraulic fluid) is a kind of fire resistant hydraulic fluid, and is a water-containing type fire resistant hydraulic fluid, which has the advantages of low price, low toxicity, more environmental protection, easy to match with non-metallic materials, better stability than water-in-oil and oil-in-water emulsions, easy storage and long service life, and is widely valued. A water-based hydraulic fluid and a preparation method thereof are disclosed in Chinese Patent No. CN112592757A, the components and weight percentage contents of which are as follows: deionized water 35-45%, water-soluble random polyether 8-16%, a composite extreme pressure anti-wear agent composed of water-soluble molybdenum and zinc dialkyldithiophosphate (ZDDP) 0.5-3.5%, a composite rust inhibitor composed of triethanolamine borate and neodecanoic acid 0.5-2.0%, diethanolamine 0.5-2.0%, benzotriazole sodium salt 0.1-0.5%, polyether modified silicon defoaming agent 0.01-0.05%, preservative 1-3%, ethylenediaminetetraacetic acid disodium 0.005-0.015%, and the balance of ethylene glycol. The water-based hydraulic fluid prepared in the patent has excellent fire resistance, low temperature resistance, wear resistance, rust resistance, low foam property, and long service life, and can meet the needs of equipment in many industries such as metallurgy, mining, machinery, chemical industry and casting under high temperature, high pressure, high speed and large capacity. Chinese Patent No. CN112375608A discloses an economical synthetic fire resistant hydraulic fluid composition and a preparation method thereof. The hydraulic fluid composition includes 0.1-2 parts of an antioxidant, 0.01-1 part of an anticorrosive agent, 0.01-3 parts of an anti-wear agent, 0.001-1 part of an anti-foaming agent, and 93-100 parts of base oil. The base oil is selected from two or more of trimethylolpropane oleate, pentaerythritol oleate, glycerol oleate, hydrogenated base oil and vegetable oil. The hydraulic fluid composition uses at least two of trimethylolpropane oleate, pentaerythritol oleate, glycerol oleate, hydrogenated base oil and vegetable oil as base oil, and its anti-wear agent is selected from one or more of organic chloride type, organic sulfide type, organic phosphide type, organic sulfur phosphide type and organic metal salt type anti-wear agents, supplemented with other components, so that it has high high-temperature fire resistance, and also has good oil-water separation performance, foam performance and rust resistance.

[0004] Most of the anti-wear agents used in the prior art hydraulic fluid contain sulfur, phosphorus, chlorine, fluorine and other organic matters, which may cause corrosion to the metal friction surface of mechanical parts, further deepen the friction loss caused by the operation of mechanical parts, reduce the corrosion resistance of the hydraulic fluid, and the durability of these anti-wear agents in anti-wear and friction reduction is relatively short. The main reason is that these anti-wear agents mainly rely on the generation of a layer of iron sulfide, iron phosphide, iron phosphate and other extreme pressure films on the friction metal surface to achieve the effect of anti-wear and friction reduction. These extreme pressure films will be gradually destroyed with the continuous friction of the metal surface, and these anti-wear agents cannot be self-repaired, resulting in the gradual weakening of the anti-wear and friction reduction function of the anti-wear agent, and even the disappearance, which leads to the short duration of the anti-wear and friction reduction effect of these anti-wear agents, thereby shortening the service life of the hydraulic fluid. In addition, sulfur, phosphorus, chlorine and other elements are toxic to the human body and pollute the environment, and are not suitable for long-term use in hydraulic fluid. Therefore, it is an urgent technical problem to develop a hydraulic fluid with good anti-wear property, good lubricity and long service life. SUMMARY

[0005] In order to solve the problems in the prior art, the purpose of the present application is to provide a fire-resistant hydraulic fluid and a preparation method thereof. The present application uses triazine derivatives and 1-ethyl acetate-3-methyl imidazole lactate ionic liquid as extreme pressure lubricant and extreme pressure anti-wear agent of the hydraulic fluid respectively, which synergistically act to effectively improve the anti-wear and friction reduction and lubrication performance of the hydraulic fluid, and prolong the service life of the hydraulic fluid.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A fire-resistant hydraulic fluid, the mass percentage of each raw material component of the hydraulic fluid is as follows: ethylene glycol 42-45%, extreme pressure lubricant 0.15-2%, extreme pressure anti-wear agent 0.2-3%, antioxidant 0.1-2%, metal deactivator 0.05-0.1%, defoaming agent 0.005-0.01%, tackifier 8-12%, and the balance is deionized water; wherein the extreme pressure lubricant is triazine derivative, the triazine derivative is 6-ethyl sulfanilic acid-2, 4-bis (sodium sulfonate)-1, 3, 5-triazine; the extreme pressure anti-wear agent is 1-ethyl acetate-3-methyl imidazole lactate ionic liquid.

[0008] Preferably, the preparation method of the 1-ethyl acetate-3-methyl imidazole lactate ionic liquid is as follows:

[0009] The equal molar amount of 1-ethyl acetate group-3-methyl imidazole cation halide and the salt compound with lactic acid anion are mixed in dry acetone, then after magnetic stirring at room temperature for 6-24 hours, the solid is filtered out, and the acetone is removed under reduced pressure to obtain the colorless ionic liquid of 1-ethyl acetate group-3-methyl imidazole lactic acid salt, whose structural formula is as follows:

[0010]

[0011] Specifically, in the friction process, the ionic liquid of 1-ethyl acetate group-3-methyl imidazole lactic acid salt is first positively charged on the metal surface due to the friction between the metals, and the negatively charged lactic acid anion in the ionic liquid is combined with the positive charge on the metal surface to form a stable anion adsorption layer on the surface of the friction pair, while the positively charged ions in the ionic liquid repel each other due to the same charge, which separates the upper and lower surfaces of the friction pair and effectively reduces the direct contact between the friction pairs, thereby reducing friction. This repulsive force also helps to improve the load-carrying capacity of the ionic liquid. At the same time, the structure of the ionic liquid contains hydroxyl and carbon-oxygen double bonds, which helps to form hydrogen bonds within the ionic liquid molecules, inhibits the hydrolysis of the ester functional group, and makes the ionic liquid have stronger polarity. In addition, the ionic liquid is an ester group functionalized ionic liquid, which makes the ionic liquid have greater viscosity, and thus the adsorption of the ionic liquid on the surface of the friction pair is stronger, i.e. a more stable and firm physical adsorption film is formed, which is less likely to be damaged during the friction process. Moreover, heat is generated during the friction process, and the temperature of the ionic liquid rises, causing the active elements N and O in the ionic liquid to chemically react with the metal friction pair to form a nitride and oxide extreme pressure tribochemical reaction film. The formation of the firm and stable physical adsorption film and the extreme pressure tribochemical reaction film can prevent direct contact between the friction pairs, thereby reducing friction and wear, improving the load-carrying capacity of the ionic liquid, and promoting lubrication. In addition, the extreme pressure tribochemical reaction film of nitride and oxide has little corrosive effect on the metal surface and does not pollute the environment, and can improve the corrosion resistance and environmental friendliness of the hydraulic fluid.

[0012] At the same time, the ionic liquid of 1-ethyl acetate group-3-methyl imidazole lactic acid salt contains hydroxyl and carbon-oxygen double bonds, which can promote the formation of hydrogen bonds within the 1-ethyl acetate group-3-methyl imidazole lactic acid salt molecules. When the 1-ethyl acetate group-3-methyl imidazole lactic acid salt molecules are damaged or injured during the friction process, the hydrogen bonds can automatically repair the 1-ethyl acetate group-3-methyl imidazole lactic acid salt molecules to restore their integrity and continue to maintain the anti-wear and friction-reducing effect, greatly improving the duration of the anti-wear and friction-reducing effect of the 1-ethyl acetate group-3-methyl imidazole lactic acid salt molecules, thereby prolonging the service life of the hydraulic fluid.

[0013] The triazine derivative 6-ethylsulfonamidyl-2,4-bis(sodium sulfonate)-1,3,5-triazine is used as an extreme pressure lubricant. The sulfonate group in the 6-ethylsulfonamidyl-2,4-bis(sodium sulfonate)-1,3,5-triazine is both an anion and a hydrophilic group, which can significantly improve the water solubility, thickening property, adsorption property and rust resistance of the lubricant. The 6-ethylsulfonamidyl-2,4-bis(sodium sulfonate)-1,3,5-triazine can form a composite boundary lubricating film containing inorganic sulfides, organic nitrides and the like on the surface of a metal friction pair by chemical adsorption, so as to achieve good lubricating effect and extreme pressure and wear resistance, and can also prevent water, oxygen and the like from contacting the metal surface to form an electrode potential and corrode the metal surface, thereby achieving the effects of rust and corrosion resistance.

[0014] Preferably, the antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, mixed liquid shielding phenol, sulfurized alkyl phenol specialty antioxidant and phenolic ester type antioxidant.

[0015] Preferably, the metal deactivator is at least one of benzotriazole, methyl benzotriazole and methyl benzotriazole derivative.

[0016] Preferably, the defoaming agent is at least one of modified organosilicon defoaming agent or ester, ether type defoaming agent; the defoaming agent is preferably a polydimethylsiloxane, organosilicon polyacrylate and methyl-terminated trifluoropropyl modified polysiloxane three-component composite.

[0017] Specifically, the polydimethylsiloxane, organosilicon polyacrylate and methyl-terminated trifluoropropyl modified polysiloxane three-component composite has a synergistic effect. The polydimethylsiloxane has good solubility and stability for the organosilicon polyacrylate and methyl-terminated trifluoropropyl modified polysiloxane two components, and the three-component composite has good dispersibility in the hydraulic fluid. The system with the specific composition of the three components can produce excellent anti-foaming property.

[0018] Preferably, the stickiness agent is polyalkylene glycol; the polyalkylene glycol is polymerized from ethylene oxide and propylene oxide; the structural formula of the polyalkylene glycol is as follows:

[0019]

[0020] Wherein, R represents alkyl, aryl or H; by adjusting the value of m / n, the polyalkylene glycol has different properties; when m≠0, the polyalkylene glycol is used as a tackifier in the fire-resistant hydraulic fluid, the polyalkylene glycol used as a tackifier can provide good lubricity, reduce steam corrosion and air release, and by adjusting the value of m / n, the shear stability, oxidation stability and rheological properties can be improved; when the polyalkylene glycol is used in the water-glycol hydraulic fluid system, the polyalkylene glycol is water-soluble, and the water-solubility can be changed by adjusting the ratio of m / n, which is beneficial to adjust the viscosity of the water-glycol hydraulic fluid system, so that the lubricity of the water-glycol hydraulic fluid system is more excellent.

[0021] Preferably, a method for preparing the fire-resistant hydraulic fluid comprises the following steps:

[0022] Step S1, based on the total mass of the fire-resistant hydraulic fluid, the antioxidant is added to part of the deionized water, stirred uniformly, and then the temperature is controlled at 30-70℃, the extreme pressure anti-wear agent is added at a certain temperature, stirred until clear, and mixture 1 is obtained;

[0023] Step 2, the metal deactivator and extreme pressure lubricant are added to the mixture 1 obtained in step S1, stirred until clear, and mixture 2 is obtained;

[0024] Step 3, the defoaming agent, tackifier, ethylene glycol and the remaining deionized water are added to the mixture 2 obtained in step S2, stirred until clear, and the fire-resistant hydraulic fluid is obtained.

[0025] Preferably, the amount of deionized water added in step S1 is 10-15%.

[0026] Preferably, the addition temperature of the extreme pressure anti-wear agent in step S1 is 30-70℃.

[0027] Compared with the prior art, the present application has the following positive and beneficial effects:

[0028] (1) The ionic liquid has good non-volatility, non-combustion and high thermal stability, and has very low friction coefficient and extreme pressure and wear resistance. The application uses ionic liquid 1-ethyl acetate group-3-methyl imidazole lactate as an extreme pressure and wear resistant agent, which improves the friction reducing and wear resistance of the hydraulic fluid, and also improves the carrying capacity and promotes the lubrication effect of the hydraulic fluid. Moreover, the structure of 1-ethyl acetate group-3-methyl imidazole lactate contains hydroxyl and carbon-oxygen double bond, which can promote the formation of hydrogen bonds in the 1-ethyl acetate group-3-methyl imidazole lactate molecule. When the 1-ethyl acetate group-3-methyl imidazole lactate molecule is damaged or injured during friction, the hydrogen bond can promote its automatic repair, so that the 1-ethyl acetate group-3-methyl imidazole lactate molecule can restore its integrity and continue to maintain the anti-wear and wear-reducing effect, greatly improving the duration of the anti-wear and wear-reducing effect of the 1-ethyl acetate group-3-methyl imidazole lactate molecule, and making the hydraulic fluid of the application have long-term anti-wear and wear resistance. At the same time, due to the high temperature stability of the ionic liquid, the ionic liquid in the non-combustible hydraulic fluid can still maintain excellent anti-wear and wear-reducing performance at high temperature, and has excellent lubrication effect, and the oxide and nitride chemical reaction lubrication film generated during friction is harmless to human body and environment.

[0029] (2) 6-ethyl sulfonamide acid group-2,4-bis (sodium sulfonate group)-1,3,5-triazine forms a composite boundary lubrication film containing inorganic sulfide, organic nitride and other components on the surface of metal friction pair by chemical adsorption, which achieves good lubrication effect and also plays an extreme pressure and wear resistant role. Therefore, the mixture of 1-ethyl acetate group-3-methyl imidazole lactate and triazine derivative 6-ethyl sulfonamide acid group-2,4-bis (sodium sulfonate group)-1,3,5-triazine can prolong the service time of the anti-wear agent and further improve the extreme pressure and wear resistance, lubrication performance of the hydraulic fluid, so that the service life of the hydraulic fluid is more long.

[0030] (3) The application forms a non-combustible hydraulic fluid with excellent wear resistance, lubricity, anti-foaming property, oxidation resistance and oxidation stability by compounding extreme pressure and wear resistant agent, extreme pressure lubricant, antioxidant, defoaming agent, tackifier with ethylene glycol and deionized water. When high heat or open flame is generated during friction, the deionized water evaporates to isolate air, achieving excellent fire-retardant effect. DETAILED DESCRIPTION

[0031] The technical solutions of the application will be described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0032] The following examples are not specified conditions, in accordance with conventional conditions or manufacturer's recommended conditions. The reagents or instruments used are not specified manufacturer, are conventional products that can be obtained by the market.

[0033] The preparation method of the ionic liquid 1-ethoxycarbonyl-3-methylimidazolium lactate is as follows:

[0034] Mixing equal molar amounts of 1-ethoxycarbonyl-3-methylimidazolium halide and salt compound with lactate anion in dry acetone, then stirring the reaction at room temperature for 6-24 h, filtering off the solid, removing acetone under reduced pressure, to obtain colorless ionic liquid of 1-ethoxycarbonyl-3-methylimidazolium lactate; the structural formula of 1-ethoxycarbonyl-3-methylimidazolium lactate is as follows:

[0035]

[0036] Example 1

[0037] A kind of fire-resistant hydraulic fluid, the mass percentage of each raw material component of the hydraulic fluid is as follows: 42% of ethylene glycol, 0.5% of extreme pressure lubricant 6-ethyldithiocarbamic acid-2, 4-bis (sodium sulfonate) -1, 3, 5-triazine, 0.5% of extreme pressure anti-wear agent ionic liquid 1-ethoxycarbonyl-3-methylimidazolium lactate, 0.8% of antioxidant 2, 6-di-tert-butyl-p-cresol, 0.05% of metal deactivator benzotriazole, 0.006% of defoaming agent polydimethylsiloxane, silicone polyacrylate and methyl-terminated trifluoropropyl modified polysiloxane complex, 10% of tackifier polyalkylene glycol polymerized from ethylene oxide and propylene oxide, and the balance is deionized water.

[0038] A kind of fire-resistant hydraulic fluid, the mass percentage of each raw material component of the hydraulic fluid is as follows: 42% of ethylene glycol, 0.5% of extreme pressure lubricant 6-ethyldithiocarbamic acid-2, 4-bis (sodium sulfonate) -1, 3, 5-triazine, 0.5% of extreme pressure anti-wear agent ionic liquid 1-ethoxycarbonyl-3-methylimidazolium lactate, 0.8% of antioxidant 2, 6-di-tert-butyl-p-cresol, 0.05% of metal deactivator benzotriazole, 0.006% of defoaming agent polydimethylsiloxane, silicone polyacrylate and methyl-terminated trifluoropropyl modified polysiloxane complex, 10% of tackifier polyalkylene glycol polymerized from ethylene oxide and propylene oxide, and the balance is deionized water.

[0039] Step S1, according to the above mass percentage, add each raw material in the fire-resistant hydraulic fluid based on the total mass of the fire-resistant hydraulic fluid, add antioxidant 2, 6-di-tert-butyl-p-cresol to 10% deionized water, stir uniformly, then control the temperature at 30℃, add extreme pressure anti-wear agent 1-ethoxycarbonyl-3-methylimidazolium lactate, stir until clear, to obtain mixture 1;

[0040] Step 2, add metal deactivator benzotriazole and extreme pressure lubricant 6-ethyldithiocarbamic acid-2, 4-bis (sodium sulfonate) -1, 3, 5-triazine to the mixture 1 obtained in step S1, stir until clear, to obtain mixture 2;

[0041] Step 3, to the mixture 2 obtained in step S2, add the antifoaming agent dimethylsiloxane, the complex of organosilicon polyacrylate and methyl-terminated trifluoropropyl modified polysiloxane, the polyalkylene glycol obtained by polymerization of ethylene oxide and propylene oxide, ethylene glycol and the remaining deionized water, stir until clear, to obtain the fire-resistant hydraulic fluid.

[0042] Example 2

[0043] A fire-resistant hydraulic fluid, the mass percentage of each raw material component of the hydraulic fluid is as follows: ethylene glycol 44%, extreme pressure lubricant 6-ethylsulfanilic acid-2,4-bis(sodium sulfonate)-1,3,5-triazine 2%, extreme pressure anti-wear agent 1-ethyl acetate-3-methyl imidazole lactate 1.8%, antioxidant mixed liquid shielding phenol 1.5%, metal deactivator methyl benzotriazole 0.1%, antifoaming agent polydimethylsiloxane, organosilicon polyacrylate and methyl-terminated trifluoropropyl modified polysiloxane complex 0.008%, polyalkylene glycol obtained by polymerization of ethylene oxide and propylene oxide 12%, and the balance is deionized water.

[0044] A method for preparing a fire-resistant hydraulic fluid, comprising the following steps:

[0045] Step S1, based on the total mass of the fire-resistant hydraulic fluid, add each raw material in the fire-resistant hydraulic fluid according to the above mass percentage, add the antioxidant mixed liquid shielding phenol to the deionized water with a mass percentage of 12%, stir uniformly, then control the temperature at 50°C to add the extreme pressure anti-wear agent 1-ethyl acetate-3-methyl imidazole lactate, stir until clear, to obtain mixture 1;

[0046] Step 2, add the metal deactivator methyl benzotriazole and the extreme pressure lubricant 6-ethylsulfanilic acid-2,4-bis(sodium sulfonate)-1,3,5-triazine to the mixture 1 obtained in step S1, stir until clear, to obtain mixture 2;

[0047] Step 3, to the mixture 2 obtained in step S2, add the antifoaming agent dimethylsiloxane, the complex of organosilicon polyacrylate and methyl-terminated trifluoropropyl modified polysiloxane, the polyalkylene glycol obtained by polymerization of ethylene oxide and propylene oxide, ethylene glycol and the remaining deionized water, stir until clear, to obtain the fire-resistant hydraulic fluid.

[0048] Example 3

[0049] A kind of fire-resistant hydraulic fluid, the mass percentage of each raw material component of the hydraulic fluid is as follows: glycol 45%, extreme pressure lubricant 6-ethyl sulfanilic acid base-2,4-bis (sodium sulfonate base)-1,3,5-triazine 1%, extreme pressure antiwear agent ionic liquid 1-ethyl acetate base-3-methyl imidazole lactate 3%, phenolic antioxidant 2%, metal deactivator methyl benzotriazole derivative 0.08%, defoaming agent polydimethylsiloxane, silicone polyacrylate and methyl end-capped trifluoropropyl modified polysiloxane three compound 0.01%, tackifier polyalkylene glycol polymerized from ethylene oxide and propylene oxide 8%, and the balance is deionized water.

[0050] A kind of fire-resistant hydraulic fluid preparation method, comprising the following steps:

[0051] Step S1, according to the above mass percentage, each raw material in the fire-resistant hydraulic fluid is added, the phenolic antioxidant is added in 15% deionized water, after stirring uniformly, the temperature is controlled at 70 DEG C, the extreme pressure antiwear agent 1-ethyl acetate base-3-methyl imidazole lactate is added, stirring is carried out until clear, and mixture 1 is obtained;

[0052] Step 2, metal deactivator methyl benzotriazole derivative and extreme pressure lubricant 6-ethyl sulfanilic acid base-2,4-bis (sodium sulfonate base)-1,3,5-triazine are added to the mixture 1 obtained in step S1, stirring is carried out until clear, and mixture 2 is obtained;

[0053] Step 3, defoaming agent dimethylsiloxane, silicone polyacrylate and methyl end-capped trifluoropropyl modified polysiloxane three compound, tackifier polyalkylene glycol polymerized from ethylene oxide and propylene oxide, glycol and the remaining deionized water are added to the mixture 2 obtained in step S2, stirring is carried out until clear, and the fire-resistant hydraulic fluid is obtained.

[0054] Comparative example 1

[0055] In the fire-resistant hydraulic fluid of comparative example 1, the extreme pressure antiwear agent is 1-ethyl acetate base-3-methyl imidazole tetrafluoroborate, and other raw material components and preparation methods are the same as example 1.

[0056] Comparative example 2

[0057] In the fire-resistant hydraulic fluid of comparative example 1, the extreme pressure lubricant is sodium petroleum sulfonate, and other raw material components and preparation methods are the same as example 1.

[0058] The performance of the fire-resistant hydraulic fluid provided by example 1-3 and comparative example 1-2 is tested, and the specific results are shown in table 1.

[0059] Table 1 performance test results of fire-resistant hydraulic fluid of example 1-3 and comparative example 1-2

[0060]

[0061] As can be seen from the data in Table 1, the performance data of the hydraulic fluids in Examples 1-3 of the present application are superior to those of Comparative Examples 1 and 2, especially the service life (rotary oxygen bomb), extreme pressure anti-wear and friction-reducing properties (wear scar diameter and maximum non-seizure load), extreme pressure lubricity (FZG gear test / invalid stage and total weight loss in vane pump test), and corrosion resistance (corrosion resistance, liquid phase rusting), all of which are significantly superior to those of Comparative Examples 1 and 2. This is probably because the ionic liquid 1-ethoxylate-3-methylimidazolium lactate is used as the extreme pressure anti-wear agent in the present application, and the structure of 1-ethoxylate-3-methylimidazolium lactate contains a hydroxyl group and a carbon-oxygen double bond, which can promote the formation of hydrogen bonds within the 1-ethoxylate-3-methylimidazolium lactate molecule. When the 1-ethoxylate-3-methylimidazolium lactate molecule is damaged or injured during friction, the hydrogen bonds can promote its self-repair, allowing the 1-ethoxylate-3-methylimidazolium lactate molecule to regain its integrity and continue to maintain its anti-wear and friction-reducing effect, greatly improving the duration of the anti-wear and friction-reducing effect of the 1-ethoxylate-3-methylimidazolium lactate molecule, thereby enabling the hydraulic fluid of the present application to have a longer service life. Moreover, the ionic liquid 1-ethoxylate-3-methylimidazolium lactate can form a firm and stable physical adsorption film and an extreme pressure friction chemical reaction film on the metal friction surface, which can prevent direct contact between the friction pairs and thereby play a friction-reducing and anti-wear role. At the same time, the 6-ethylsulfanilic acid group-2,4-bis(sodium sulfonate group)-1,3,5-triazine forms a composite boundary lubrication film containing inorganic sulfides and organic nitrides on the metal friction pair surface by chemical adsorption, achieving good lubrication effect while also playing an extreme pressure anti-wear role. Therefore, the combination of 1-ethoxylate-3-methylimidazolium lactate and the triazine derivative 6-ethylsulfanilic acid group-2,4-bis(sodium sulfonate group)-1,3,5-triazine can have a synergistic effect, further improving the extreme pressure anti-wear and lubrication properties of the hydraulic fluid, thereby prolonging the service life of the hydraulic fluid. At the same time, the extreme pressure friction chemical reaction film produced on the metal surface by the ionic liquid 1-ethoxylate-3-methylimidazolium lactate as the extreme pressure anti-wear agent is an oxide or nitride, which has little corrosive effect on the metal surface and can improve the corrosion resistance of the hydraulic fluid.

[0062] It is to be understood that the terminology used herein such as first and second, and the like, is only used to distinguish one entity or action from another entity or action, and does not necessarily require or imply any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0063] While embodiments of the present application have been shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application. The scope of the application is thus defined by the appended claims and their equivalents.

Claims

1. A fire resistant hydraulic fluid, characterized in that, The mass percentage of each raw material component of the hydraulic fluid is as follows: ethylene glycol 42-45%, extreme pressure lubricant 0.15-2%, extreme pressure anti-wear agent 0.2-3%, antioxidant 0.1-2%, metal passivator 0.05-0.1%, defoaming agent 0.005-0.01%, tackifier 8-12%, and the balance is deionized water; wherein the extreme pressure lubricant is a triazine derivative, the triazine derivative is 6-ethylsulfonamide-2,4-bis (sodium sulfonate) -1,3,5-triazine; the extreme pressure anti-wear agent is an ionic liquid of 1-ethyl acetate-3-methyl imidazole lactate; The preparation method of the ionic liquid of 1-ethyl acetate-3-methyl imidazole lactate is as follows: Mixing equal molar amounts of 1-ethyl acetate-3-methyl imidazole cation halide and salt compound of lactic acid anion in dry acetone, then stirring the reaction under room temperature for 6-24h, removing the solid by filtration, and removing acetone under reduced pressure to obtain colorless ionic liquid of 1-ethyl acetate-3-methyl imidazole lactate; The preparation method of the fire-resistant hydraulic fluid comprises the following steps: Step S1, based on the total mass of the fire-resistant hydraulic fluid, adding the antioxidant to part of the deionized water, stirring uniformly, then adding the extreme pressure anti-wear agent at a certain temperature, stirring until clear, to obtain mixture 1; Step 2, adding the metal passivator and the extreme pressure lubricant to the mixture 1 obtained in step S1, stirring until clear, to obtain mixture 2; Step 3, adding the defoaming agent, the tackifier, the ethylene glycol and the remaining deionized water to the mixture 2 obtained in step S2, stirring until clear, to obtain the fire-resistant hydraulic fluid.

2. The fire resistant hydraulic fluid of claim 1, wherein, The antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, mixed liquid shielding phenol and phenolic ester type antioxidant.

3. The fire resistant hydraulic fluid of claim 1 wherein, The metal passivator is at least one of benzotriazole, methyl benzotriazole and methyl benzotriazole derivative.

4. The fire resistant hydraulic fluid of claim 1 wherein, The defoaming agent is at least one of silicone defoaming agent or ester, ether defoaming agent.

5. The fire resistant hydraulic fluid of claim 1 wherein, The tackifier is polyalkylene glycol, which is polymerized from ethylene oxide and propylene oxide.

6. The fire resistant hydraulic fluid of claim 1 wherein, The amount of deionized water added in step S1 is 10-15%.

7. The fire resistant hydraulic fluid of claim 1 wherein, The addition temperature of the extreme pressure anti-wear agent in step S1 is 30-70°C.

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