Environmentally friendly hydraulic support emulsified oil concentrate and preparation method thereof

Abstract

The invention discloses an environmentally friendly hydraulic support emulsified oil concentrate and a preparation method thereof, and belongs to the technical field of liquid lubricating oil for mechanical equipment. The invention comprises the following raw materials by weight: 43-68 parts of modified base oil, 0.1-4.4 parts of silicon-oxygen bond-containing emulsifier, 0.12-0.31 parts of antiwear agent, 0.001-0.003 parts of defoamer, 0.16-0.29 parts of rust inhibitor and 5-11 parts of water. The invention uses vegetable oil as base oil, obtains a modified base oil with a high-temperature resistant imine bond by ester exchange modification, and then mixes and emulsifies with an emulsifier, an antiwear agent, a defoamer, a rust inhibitor and water to obtain an environmentally friendly hydraulic support emulsified oil concentrate.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid lubricating oil for mechanical equipment, and in particular relates to an environmentally friendly hydraulic support emulsified oil concentrate and a preparation method thereof. Background Art

[0002] Coal is the main energy source in my country and has an important strategic position in the national economic construction. Before the large-scale utilization of new energy in the future, coal is an important variety to support energy supply. To build my country into a "resource-saving and environmentally friendly" society, the coal industry faces historic challenges and opportunities and is undergoing a critical transformation. The support equipment for underground coal mining is mainly realized by hydraulic supports, and the hydraulic oil used is required to have excellent functions such as flame retardancy, rust resistance and wear resistance. Most of the time, the environment of the coal mining face is harsh, with high concentrations of dust and gas, which is very easy to cause explosions and safety accidents of varying degrees. Therefore, it is very important to select explosion-proof and flame-retardant working media for coal mine safety production, and emulsion can play such a role. There are a large number of hydraulic supports used in the coal mining face. One working face requires hundreds of hydraulic supports, and the hydraulic supports are mobile devices, which are easily damaged and leaked during mobile work, resulting in a large loss of liquid. When the work is completed, it is also very difficult to recover all the liquid in the pipeline and the oil cylinder, so coal mines generally rarely recycle and directly discharge them underground. Since hydraulic oil uses more mineral oil, and the degradation rate of mineral oil is very slow, and due to the effect of emulsifier, the oil-water mixture produced when the hydraulic oil is cooled with water is difficult to separate. The waste emulsion of hydraulic support obtained after use is discharged underground at a depth of several hundred meters, which inevitably pollutes the groundwater. For many years, people have not paid attention to this water pollution problem. The "Environmental Monitoring Method Standard Machine Testing Specification" issued by the State Environmental Protection Agency has listed petroleum as one of the items that must be measured for surface water and wastewater discharged by related industries. For the requirements of environmental protection and energy saving, it is of great significance to accelerate the research and development of an environmentally friendly hydraulic oil.

[0003] Patent CN115895767A discloses an environmentally friendly corrosion-inhibiting emulsified oil for hydraulic supports. The invention uses base oil, phosphate, polyoxyethylene sorbitan monostearate, propylene glycol 3, vinyl acetate-fumarate copolymer, polydimethylsiloxane, water-based rust inhibitor, sodium molybdate and water as raw materials, white oil as base oil, polyoxyethylene sorbitan monostearate and propylene glycol as emulsifiers to improve the surface tension between base oil and water, so as to form a uniform and stable dispersion system, so that the base oil molecules have both hydrophilic and lipophilic groups, and the metal is protected by the anticorrosive agent to avoid the eutrophication of water bodies caused by the reproduction of microorganisms, thereby achieving environmental protection. However, since white oil belongs to mineral oil, mineral oil mainly contains more hydrocarbon compounds, has a slow degradation rate, and direct discharge is harmful to the environment, so environmental protection needs to be discussed.

[0004] Patent CN105462673A discloses an environmentally friendly hydraulic support emulsified oil and a preparation method thereof. The patent uses Taiko oil, sodium hydroxide, emulsifier, sodium benzoate, cyclohexane acid, sodium nitrite, EDTA, triethanolamine, borax, benzotriazole and water as raw materials, and obtains the environmentally friendly hydraulic support emulsified oil by mixing, stirring and emulsifying.

[0005] Patent CN10485711A discloses an environmentally friendly anti-wear hydraulic oil and its preparation process. The invention uses linseed oil, castor oil and sunflower oil as base oils, and prepares environmentally friendly anti-wear hydraulic oil by mixing with auxiliary agents such as emulsifiers and anti-wear agents.

[0006] The base oils used in the above two inventions are both vegetable oils, which contain a large amount of fatty acid esters and are easily degraded, and are more environmentally friendly than hydrocarbon mineral oils. However, due to the presence of emulsifiers, the oil-water mixture in the used hydraulic oil waste liquid is difficult to separate and recycle.

[0007] Therefore, it is of great significance to design an environmentally friendly hydraulic support emulsified oil that is easy to separate oil-water mixture. Summary of the invention

[0008] In view of the deficiencies of the prior art, the present invention uses vegetable oil as the base oil, obtains a modified base oil with a high temperature resistant imine bond by ester exchange modification, and then mixes and emulsifies with an emulsifier, an anti-wear agent, a defoamer, a rust inhibitor and water to obtain an environmentally friendly hydraulic support emulsified oil concentrate, which solves the technical problems raised in the background technology. Specifically, the technical solution of the present invention includes the following contents:

[0009] Environmentally friendly hydraulic support emulsified oil concentrate, the emulsified oil concentrate comprises the following raw materials in parts by weight:

[0010] 43-68 parts of modified base oil, 0.1-4.4 parts of silicon-oxygen bond emulsifier, 0.12-0.31 parts of anti-wear agent, 0.001-0.003 parts of defoaming agent, 0.16-0.29 parts of rust inhibitor and 5-11 parts of water by weight.

[0011] Furthermore, the preparation method of the modified base oil comprises the following steps:

[0012] The alcohol derivative and the water-soluble aldehyde are mixed in a molar ratio of 1:1-2, heated to 45°C-55°C, and reacted for 2h-3h to obtain a modified alcohol derivative;

[0013] The modified alcohol derivative and the base oil are dried with anhydrous sodium sulfate and then mixed to form a reaction liquid. The reaction liquid is subjected to a strong base catalytic reaction to obtain the modified base oil.

[0014] Furthermore, the alcohol derivative includes ethanolamine or DL-aminopropanol, and the structure of the alcohol derivative needs to contain at least one hydroxyl group and one amino group, the hydroxyl group is used for subsequent ester exchange with the base oil, and the amino group is used to form an imine bond with a water-soluble aldehyde, and the imine bond is introduced into the modified base oil.

[0015] Furthermore, the water-soluble aldehyde includes acetaldehyde or propionaldehyde.

[0016] Furthermore, the base oil includes soybean oil, rapeseed oil, cottonseed oil or linseed oil. The base oil needs to be a vegetable oil containing relatively low saturated fatty acids. Saturated fatty acids have a relatively tight molecular structure, a high melting point, and poor fluidity, and are not conducive to lubricating after modification.

[0017] Furthermore, the mass ratio of the modified alcohol derivative to the base oil is 5-8:1.

[0018] Furthermore, the conditions for the strong base catalytic reaction include a strong base dosage of 0.5% to 2% of the total mass of the reaction solution, a reaction temperature of 60° C. to 70° C., and a reaction time of 70 min to 100 min.

[0019] Furthermore, the strong base includes sodium hydroxide or potassium hydroxide.

[0020] Furthermore, the silicon-oxygen bond-containing emulsifier includes PEG-10 polydimethylsiloxane or PEG-12 polydimethylsiloxane.

[0021] Further, the anti-wear agent includes T 304, T 307 or T 323, the defoaming agent includes KT 903A, KT991 or KT 992, and the rust inhibitor includes T 702, KT Z04 or BD C010.

[0022] A method for preparing an environmentally friendly hydraulic support emulsified oil concentrate, the preparation method comprising the following steps:

[0023] The silicon-oxygen bond emulsifier, anti-wear agent, rust inhibitor and water are mixed and heated to 40°C-45°C and stirred for 15min-20min. After stirring, the temperature is lowered to 25°C±2°C, and the modified base oil and defoamer are added and mixed and stirred for 20min-30min to obtain the emulsified oil concentrate.

[0024] Application of emulsified oil concentrate in the field of liquid lubricants.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention uses vegetable oil as the base oil, because vegetable oil has good environmental degradability compared with mineral oil. However, since vegetable oil is not resistant to high temperature, it is easy to be degraded and lose its lubricating effect due to high temperature in the environment where the hydraulic support is used. By designing the structure of alcohol derivatives, an imine bond with high temperature resistance is introduced, and then the glycerol structure of the fatty acid ester in the vegetable oil is replaced by the ester exchange principle, so that the modified alcohol derivative with the imine bond is connected with the fatty acid through a condensation reaction, thereby obtaining a modified base oil with high temperature resistance, and the imine bond is a polar chemical bond, which has a certain effect on improving the water solubility of the vegetable oil, thereby reducing the use amount of the emulsifier. Then, it is mixed and emulsified with an emulsifier having a silicon-oxygen bond, an anti-wear agent, a defoamer, an anti-rust agent and water to obtain an environmentally friendly hydraulic support emulsified oil concentrate. The emulsifier with a silicon-oxygen bond can break the silicon-oxygen bond in an acidic environment to form a silicon hydroxyl group, thereby losing the emulsification effect. Therefore, when the hydraulic support emulsified oil concentrate is recovered, the silicon-oxygen bond structure is broken by acid treatment, and the emulsifier containing the silicon-oxygen bond is degraded and loses its emulsification performance. The silicon hydroxyl structure obtained after degradation has good hydrophilicity, which promotes oil-water separation. In an acidic environment, the imine bond is also prone to hydrolysis and cleavage, which prompts the modified base oil to release hydrophobic substances such as long-chain fatty acids that are difficult to dissolve in water, further increasing the degree of oil-water separation in the mixed system, thereby promoting oil-water separation. The synergistic effect of the hydrolysis of the emulsifier containing the silicon-oxygen bond and the hydrolysis and cleavage of the imine bond improves the effect of oil-water separation. Oil-water separation has the advantage of reducing resource waste for recycling the hydraulic support emulsified oil concentrate for reuse. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below through the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] Unless otherwise specified, the raw materials and reagents used in the present invention are commercially available or can be prepared by known methods.

[0029] PEG-10 polydimethylsiloxane and PEG-12 polydimethylsiloxane were purchased from Zhejiang Zhenghe Silicon Materials Co., Ltd.;

[0030] T 304, T 307, T 323, KT 903A, KT 991, KT 992, T 702, KT Z04 and BD C010 were all purchased from Kangtai Lubricant Additives Co., Ltd.

[0031] Preparation Example 1:

[0032] The preparation of modified soybean oil specifically includes the following processes:

[0033] 2 mol of ethanolamine and 2 mol of acetaldehyde were mixed in a reaction bottle, and then 500 mL of anhydrous ethanol was added and stirred evenly, and then the reaction bottle was heated to 45°C and reacted for 2 hours. After the reaction was completed, the solvent anhydrous ethanol was removed by reduced pressure distillation to obtain a modified alcohol derivative.

[0034] Add 0.1g of anhydrous sodium sulfate per gram of modified alcohol derivatives and soybean oil, dry overnight, and then filter to remove the anhydrous sodium sulfate. Then take 100g of the dried modified alcohol derivatives and 20g of the dried soybean oil, mix them and place them in a reaction bottle, stir to form a reaction solution, add 0.6g of sodium hydroxide to the reaction solution, heat it to 60°C and stir to react for 70min. After the reaction is completed, add dilute hydrochloric acid to neutralize it to neutrality, then add deionized water, mix, stir and stand. Take the upper organic oil phase layer, rinse it with deionized water and dry it to obtain modified soybean oil.

[0035] Preparation Example 2:

[0036] The preparation of modified rapeseed oil specifically includes the following processes:

[0037] 2 mol of ethanolamine and 3 mol of acetaldehyde were mixed in a reaction bottle, and then 500 mL of anhydrous ethanol was added and stirred evenly, and then the reaction bottle was heated to 50°C and reacted for 2.5 hours. After the reaction was completed, the solvent anhydrous ethanol was removed by vacuum distillation to obtain a modified alcohol derivative.

[0038] The modified alcohol derivative and rapeseed oil were dried overnight with 0.1g of anhydrous sodium sulfate added per gram, and then filtered to remove the anhydrous sodium sulfate. Then 120g of the dried modified alcohol derivative and 20g of the dried rapeseed oil were mixed and placed in a reaction bottle and stirred to form a reaction solution. 1.4g of sodium hydroxide was added to the reaction solution, and the temperature was raised to 65°C and stirred for 80 minutes. After the reaction was completed, dilute hydrochloric acid was added to neutralize to neutrality, and then deionized water was added to mix and stir and stand. The upper organic oil phase layer was rinsed with deionized water and dried to obtain modified rapeseed oil.

[0039] Preparation Example 3:

[0040] The preparation of modified cottonseed oil specifically includes the following processes:

[0041] 2 mol of DL-aminopropanol and 4 mol of propionaldehyde were mixed in a reaction bottle, and then 500 mL of anhydrous ethanol was added and stirred evenly, and then the reaction bottle was heated to 55°C and reacted for 3 hours. After the reaction was completed, the solvent anhydrous ethanol was removed by reduced pressure distillation to obtain a modified alcohol derivative.

[0042] The modified alcohol derivative and cottonseed oil were dried overnight with 0.1 g of anhydrous sodium sulfate added per gram, and then filtered to remove the anhydrous sodium sulfate. Then 140 g of the dried modified alcohol derivative and 20 g of the dried cottonseed oil were mixed and placed in a reaction bottle and stirred to form a reaction solution. 2.4 g of potassium hydroxide was added to the reaction solution, and the temperature was raised to 70 ° C and stirred for 90 minutes. After the reaction was completed, dilute hydrochloric acid was added to neutralize to neutrality, and then deionized water was added to mix and stir and stand. The upper organic oil phase layer was rinsed with deionized water and dried to obtain modified cottonseed oil.

[0043] Preparation Example 4:

[0044] The preparation of modified linseed oil specifically includes the following processes:

[0045] 2 mol of DL-aminopropanol and 4 mol of propionaldehyde were mixed in a reaction bottle, and then 500 mL of anhydrous ethanol was added and stirred evenly, and then the reaction bottle was heated to 55°C and reacted for 3 hours. After the reaction was completed, the solvent anhydrous ethanol was removed by reduced pressure distillation to obtain a modified alcohol derivative.

[0046] The modified alcohol derivative and cottonseed oil were dried overnight with 0.1 g of anhydrous sodium sulfate added per gram, and then filtered to remove the anhydrous sodium sulfate. Then 160 g of the dried modified alcohol derivative and 20 g of the dried cottonseed oil were mixed and placed in a reaction bottle and stirred to form a reaction solution. 3.6 g of potassium hydroxide was added to the reaction solution, and the temperature was raised to 70 ° C and stirred for 100 minutes. After the reaction was completed, dilute hydrochloric acid was added to neutralize to neutrality, and then deionized water was added to mix and stir and stand. The upper organic oil phase layer was rinsed with deionized water and dried to obtain modified linseed oil.

[0047] Preparation Example 5:

[0048] The preparation of modified coconut oil specifically includes the following processes:

[0049] 2 mol of DL-aminopropanol and 4 mol of propionaldehyde were mixed in a reaction bottle, and then 500 mL of anhydrous ethanol was added and stirred evenly, and then the reaction bottle was heated to 55°C and reacted for 3 hours. After the reaction was completed, the solvent anhydrous ethanol was removed by reduced pressure distillation to obtain a modified alcohol derivative.

[0050] The modified alcohol derivative and coconut oil were dried overnight with 0.1 g of anhydrous sodium sulfate added per gram, and then filtered to remove the anhydrous sodium sulfate. Then 160 g of the dried modified alcohol derivative and 20 g of dried coconut oil were mixed and placed in a reaction bottle and stirred to form a reaction solution. 3.6 g of potassium hydroxide was added to the reaction solution, and the temperature was raised to 70 ° C and stirred for 100 min. After the reaction was completed, dilute hydrochloric acid was added to neutralize to neutrality, and then deionized water was added to mix and stir and stand. The upper organic oil phase layer was rinsed with deionized water and dried to obtain modified sub-coconut oil.

[0051] Example 1

[0052] The preparation of environmentally friendly hydraulic support emulsified oil concentrate specifically includes the following processes:

[0053] 4.4 parts by weight of PEG-10 polydimethylsiloxane, 0.12 parts by weight of anti-wear agent T 304, 0.16 parts by weight of rust inhibitor T 702 and 5 parts by weight of water were mixed, heated to 40°C and stirred for 15 minutes. After stirring, the temperature was lowered to a temperature range of 25°C ± 2°C, and 43 parts by weight of modified soybean oil obtained in Preparation Example 1 and 0.001 parts by weight of defoamer KT 903A were added and mixed and stirred for 20 minutes to obtain an emulsified oil concentrate.

[0054] Example 2

[0055] The preparation of environmentally friendly hydraulic support emulsified oil concentrate specifically includes the following processes:

[0056] 3.2 parts by weight of PEG-10 polydimethylsiloxane, 0.19 parts by weight of antiwear agent T 307, 0.21 parts by weight of rust inhibitor KT Z04 and 8 parts by weight of water were mixed, heated to 42°C and stirred for 17 minutes. After stirring, the temperature was lowered to a temperature range of 25°C ± 2°C, and 52 parts by weight of the modified rapeseed oil obtained in Preparation Example 2 and 0.002 parts by weight of defoamer KT 991 were added and stirred for 25 minutes to obtain an emulsified oil concentrate.

[0057] Example 3

[0058] The preparation of environmentally friendly hydraulic support emulsified oil concentrate specifically includes the following processes:

[0059] 1.9 parts by weight of PEG-12 polydimethylsiloxane, 0.25 parts by weight of anti-wear agent T 307, 0.26 parts by weight of rust inhibitor KT Z04 and 9 parts by weight of water were mixed, heated to 42°C and stirred for 17 minutes. After stirring, the temperature was lowered to a temperature range of 25°C ± 2°C, and 60 parts by weight of modified cottonseed oil obtained in Preparation Example 3 and 0.003 parts by weight of defoamer KT 991 were added and stirred for 25 minutes to obtain an emulsified oil concentrate.

[0060] Example 4

[0061] The preparation of environmentally friendly hydraulic support emulsified oil concentrate specifically includes the following processes:

[0062] 0.1 parts by weight of PEG-12 polydimethylsiloxane, 0.31 parts by weight of anti-wear agent T 323, 0.29 parts by weight of rust inhibitor BD C010 and 11 parts by weight of water were mixed, heated to 45°C and stirred for 20 minutes. After stirring, the temperature was lowered to a temperature range of 25°C±2°C, and 68 parts by weight of the modified linseed oil obtained in Preparation Example 4 and 0.003 parts by weight of defoamer KT 992 were added and stirred for 30 minutes to obtain an emulsified oil concentrate.

[0063] Comparative Example 1:

[0064] The preparation of environmentally friendly hydraulic support emulsified oil concentrate specifically includes the following processes:

[0065] The modified linseed oil in Example 4 was replaced by the modified coconut oil obtained in Preparation Example 5, and the other conditions were the same as in Example 4.

[0066] Comparative Example 2:

[0067] The preparation of environmentally friendly hydraulic support emulsified oil concentrate specifically includes the following processes:

[0068] The PEG-12 polydimethylsiloxane in Example 4 was replaced with emulsifier AEO-9, and the other conditions remained the same as in Example 4.

[0069] Comparative Example 3:

[0070] The preparation of environmentally friendly hydraulic support emulsified oil concentrate specifically includes the following processes:

[0071] The modified linseed oil in Example 4 was replaced by linseed oil, and the other conditions remained the same as in Example 4.

[0072] According to the standard "MT 76-2011 Emulsified oil, concentrated liquid and high water content hydraulic oil for hydraulic support", the performance indicators such as the congealing point, pH value, kinematic viscosity and water dispersibility of the emulsified oil concentrated liquid obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were measured. The results are shown in Table 1 below:

[0073] Table 1

[0074]

[0075] From the above results, it can be seen that;

[0076] (1) The emulsified oil concentrate obtained by modifying the vegetable oil instead of the mineral oil in the present invention meets the test standard value and has good lubrication and dispersion properties.

[0077] (2) It can be seen from Comparative Example 1 that the saturated fatty acid content of coconut oil is relatively high. Saturated fatty acids have a relatively tight molecular structure, a high melting point, and poor fluidity, which is not conducive to exerting a lubricating effect.

[0078] (3) It can be seen from Comparative Example 3 that under the formulation conditions of the present invention, the lubrication and dispersion properties of the emulsion concentrate prepared directly using vegetable oil are relatively poor.

[0079] According to the standard "GB / T 5538-2005 Determination of Peroxide Value of Animal and Vegetable Oils and Fats", the peroxide value of the emulsified oil concentrates obtained in Examples 1 to 4 and Comparative Examples 1 to 3 was tested, and the results are shown in Table 2 below:

[0080] Table 2

[0081]

[0082] It can be found from the data in Table 2 that the emulsified oil concentrates obtained in Examples 1 to 4 of the present invention have good antioxidant properties.

[0083] The emulsified oil concentrates obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were respectively mixed with an equal amount of water to form an oil-water mixture, and then diluted hydrochloric acid was added to adjust the pH to a range of 4±0.5, and then heated to 50° C. and stirred for 10 hours. After the heating and stirring were completed, the mixture was allowed to stand for 30 minutes to observe the oil-water separation. The structure is shown in Table 3:

[0084] Table 3

[0085]

[0086] It can be seen from the acid treatment heating oil-water separation test results in Table 3 that the imine bond constructed by the present invention and the silicon-oxygen bond-containing emulsifier used have a good effect on the oil-water separation of the emulsified oil concentrate after use, which helps to recycle the waste liquid of the emulsified oil concentrate after use and reduce pollution to the environment.

[0087] The above-described embodiments provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected.

Claims

1. An environmentally friendly hydraulic support emulsified oil concentrate, characterized in that: The emulsified oil concentrate comprises the following raw materials in parts by weight: 43-68 parts of modified base oil, 0.1-4.4 parts of silicone-oxygen bond emulsifier, 0.12-0.31 parts of antiwear agent, 0.001-0.003 parts of defoaming agent, 0.16-0.29 parts of rust inhibitor and 5-11 parts by weight of water; The preparation method of the modified base oil comprises the following steps: The alcohol derivative and the water-soluble aldehyde are mixed in a molar ratio of 1:1-2, heated to 45°C-55°C, and reacted for 2h-3h to obtain a modified alcohol derivative; The modified alcohol derivative and the base oil are dried with anhydrous sodium sulfate and then mixed to form a reaction liquid, and the reaction liquid is subjected to a strong base catalytic reaction to obtain the modified base oil; The base oil is soybean oil, rapeseed oil, cottonseed oil or linseed oil; The silicon-oxygen bond-containing emulsifier is PEG-10 polydimethylsiloxane or PEG-12 polydimethylsiloxane.

2. The environmentally friendly hydraulic support emulsified oil concentrate according to claim 1, characterized in that: The alcohol derivatives include ethanolamine or DL-aminopropanol.

3. The environmentally friendly hydraulic support emulsified oil concentrate according to claim 1, characterized in that: The water-soluble aldehyde includes acetaldehyde or propionaldehyde.

4. The environmentally friendly hydraulic support emulsified oil concentrate according to claim 1, characterized in that: The mass ratio of the modified alcohol derivative to the base oil is 5-8:

1.

5. The environmentally friendly hydraulic support emulsified oil concentrate according to claim 1, characterized in that: The conditions for the strong base catalytic reaction include the amount of the strong base being 0.5% to 2% of the total mass of the reaction solution, the reaction temperature being 60° C. to 70° C., and the reaction time being 70 min to 100 min.

6. A method for preparing an environmentally friendly hydraulic support emulsified oil concentrate as claimed in any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: The silicon-oxygen bond emulsifier, anti-wear agent, rust inhibitor and water are mixed and heated to 40°C-45°C and stirred for 15min-20min. After stirring, the temperature is lowered to 25°C±2°C, and the modified base oil and defoamer are added and mixed and stirred for 20min-30min to obtain the emulsified oil concentrate.

7. Use of the environmentally friendly hydraulic support emulsified oil concentrate according to any one of claims 1 to 5 or the emulsified oil concentrate prepared by the preparation method of the environmentally friendly hydraulic support emulsified oil concentrate according to claim 6 in the field of liquid lubricating oil.

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