Ionic liquid, preparation method and application thereof, hydraulic support fluid

Abstract

The present invention provides an ionic liquid, a preparation method, and applications thereof, as well as a hydraulic support fluid, relating to the technical field of hydraulic fluids. The ionic liquid provided herein is environmentally friendly and can be evenly dispersed in water to form a hydraulic support fluid. It then forms a high-strength physical adsorption film with the metal on the friction surface, thereby enhancing the extreme pressure and anti-wear properties of the hydraulic support fluid and improving its friction reduction effect. The ionic liquid also significantly improves the hydraulic support fluid's anti-corrosion properties. Furthermore, the hydraulic support fluid provided herein has low water quality requirements and is suitable for use in areas with high hardness levels, thus having a wide range of applications.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic fluids, and in particular to an ionic liquid, a preparation method and application thereof, and a hydraulic support fluid. Background Art

[0002] Coal mine hydraulic support systems are key equipment installed at the coal mining face and are a critical component of modern coal mining. They provide essential support, lifting, movement, and overload protection for coal mining operations. These functions are achieved through hydraulic support fluid, which is often referred to as the "blood" of the hydraulic support system.

[0003] Due to the high volume of hydraulic support fluids used and their rapid replacement, leaks or unpurified discharges can easily contaminate groundwater and pose a threat to human health. Therefore, environmentally friendly hydraulic support fluids are becoming a growing research priority. Currently, there are few reports on the application of environmentally friendly ionic liquids as lubricating and rust-preventing additives in hydraulic support fluids. Summary of the Invention

[0004] The present invention aims to provide an ionic liquid, a preparation method and application thereof, and a hydraulic support fluid. The ionic liquid provided by the present invention is environmentally friendly, and the hydraulic support fluid prepared using the ionic liquid can significantly improve tribological properties and has good anti-corrosion properties and excellent friction reduction properties.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides an ionic liquid having a structure shown in Formula 1:

[0007]

[0008] The present invention provides a method for preparing the ionic liquid of the above scheme, comprising the following steps: mixing an alcohol solution of dimer acid and an aqueous solution of choline hydroxide, and performing an esterification reaction to obtain the ionic liquid.

[0009] Preferably, the molar ratio of the dimer acid to choline hydroxide is 1:2.

[0010] Preferably, the alcohol solution of dimer acid comprises an ethanol solution of dimer acid; and the concentration of dimer acid in the alcohol solution of dimer acid is 95-98 wt %.

[0011] Preferably, the concentration of choline hydroxide in the aqueous solution of choline hydroxide is 95-98 wt %.

[0012] Preferably, the esterification reaction temperature is 20-35° C., and the reaction time is 12-24 hours.

[0013] Preferably, after the esterification reaction is completed, the obtained product liquid is subjected to reduced pressure distillation and vacuum drying.

[0014] The present invention provides the use of the ionic liquid described in the above scheme or the ionic liquid prepared by the preparation method described in the above scheme in a hydraulic support fluid.

[0015] The present invention provides a hydraulic support fluid, which comprises 0.1 to 1.5% of ionic liquid and the balance of water, calculated by mass percentage.

[0016] The ionic liquid is the ionic liquid described in the above scheme or the ionic liquid prepared by the preparation method described in the above scheme.

[0017] Preferably, the hydraulic support fluid further comprises 0.01-0.1% of an anti-foaming agent and 0.01-0.02% of a dye.

[0018] The ionic liquid provided in this application is environmentally friendly and can be evenly dispersed in water to form a hydraulic support fluid. It then forms a high-strength physical adsorption film with the metal on the friction surface, thereby enhancing the hydraulic support fluid's extreme pressure and anti-wear properties and friction reduction. The ionic liquid also significantly improves the hydraulic support fluid's anti-corrosion properties. Furthermore, the hydraulic support fluid provided in this application has low water quality requirements and is suitable for use in areas with high hardness levels, thus having a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FTIR spectra of dimer acid, choline hydroxide and ionic liquid [cho][dimer];

[0020] Figure 2 The storage stability test diagrams of Example 3 (left) and Comparative Example 5 (right) are shown. DETAILED DESCRIPTION

[0021] The present invention provides an ionic liquid having a structure shown in Formula 1:

[0022]

[0023] The present invention provides a method for preparing the ionic liquid of the above scheme, comprising the following steps: mixing an alcohol solution of dimer acid and an aqueous solution of choline hydroxide, and performing an esterification reaction to obtain the ionic liquid.

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

[0025] In the present invention, the alcoholic solution of dimer acid preferably includes an ethanol solution of dimer acid; the concentration of dimer acid in the alcoholic solution of dimer acid is preferably 95-98 wt%; in a specific embodiment of the present invention, the concentration of dimer acid in the alcoholic solution of dimer acid can be 95 wt%, 96 wt%, 97 wt% or 98 wt%.

[0026] In the present invention, the concentration of the aqueous solution of choline hydroxide is preferably 95-98 wt %. In a specific embodiment of the present invention, the concentration of the aqueous solution of choline hydroxide may be 95 wt %, 96 wt %, 97 wt % or 98 wt %.

[0027] In the present invention, the molar ratio of the dimer acid to choline hydroxide is preferably 1:2.

[0028] In the present invention, the temperature of the esterification reaction is preferably 20-35° C. (i.e., room temperature), and the time of the esterification reaction is preferably 12-24 h; in a specific embodiment, the time of the esterification reaction can be 12 h, 15 h, 18 h, 20 h, or 24 h.

[0029] In the present invention, the esterification reaction is preferably carried out under stirring conditions.

[0030] In the present invention, the equation of the esterification reaction is as follows:

[0031]

[0032] After the esterification reaction is completed, the present invention preferably further comprises subjecting the obtained product liquid to reduced pressure distillation and vacuum drying to obtain the ionic liquid.

[0033] In the present invention, the temperature of the reduced pressure distillation is preferably 30-80°C; in a specific embodiment, the temperature of the reduced pressure distillation can be 30°C, 50°C, 60°C, 70°C or 80°C.

[0034] In the present invention, the vacuum drying temperature is preferably 50-100°C, and the time is preferably 24-48 hours. In specific embodiments, the vacuum drying temperature can be 50°C, 60°C, 80°C, or 100°C, and the vacuum drying time can be 24 hours, 30 hours, 36 hours, or 48 hours. The present invention has no special requirements for the vacuum degree of the vacuum drying.

[0035] The present invention provides the use of the ionic liquid described in the above scheme or the ionic liquid prepared by the preparation method described in the above scheme in a hydraulic support fluid.

[0036] The present invention provides a hydraulic support fluid, which comprises 0.1-1.5% of the above-mentioned ionic liquid and the remainder of water in terms of mass percentage.

[0037] The hydraulic support fluid provided by the present invention includes 0.1 to 1.5% of an ionic liquid by weight. In specific embodiments, the ionic liquid content can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, or 1.2%. By controlling the ionic liquid content within the above range, the present invention avoids turbidity in the hydraulic support fluid due to solubility limitations caused by excessive content, while also imparting excellent extrusion anti-wear, friction reduction, and demulsification properties to the hydraulic support fluid.

[0038] The hydraulic support fluid provided herein preferably includes an antifoaming agent in an amount of 0.01-0.1% by weight. In specific embodiments, the antifoaming agent content may be 0.01%, 0.02%, 0.04%, 0.06%, 0.08%, or 0.1%. In the present invention, the antifoaming agent is preferably one or more of a silicone antifoaming agent and a polyether antifoaming agent. The present invention does not impose any particular requirements on the specific type of silicone antifoaming agent or polyether antifoaming agent; any silicone antifoaming agent or polyether antifoaming agent known in the art may be used. In the embodiments of the present invention, the antifoaming agent MS 575 is specifically used.

[0039] The hydraulic support fluid provided by the present invention preferably includes 0.01 to 0.02% of a dye in terms of mass percentage. In the present invention, the dye preferably includes toluidine.

[0040] The hydraulic support fluid provided by the present invention also includes a water balance. The present invention has no particular requirements for the water; any water known in the art can be used, such as deionized water, tap water, or one or more of the eight grades of artificial hard water prepared according to the MT 76-2011 standard. In the present invention, the eight grades of artificial hard water prepared according to the MT 76-2011 standard are 5, 10, 15, 20, 25, 30, 35, and 40, respectively (based on the concentration of anions and cations in the water; the higher the grade, the higher the hardness and the higher the ion concentration).

[0041] This application utilizes a specific ionic liquid that disperses evenly in water to form a hydraulic support fluid. This liquid forms a high-strength physical adsorption film with the metal on the friction surface, thereby enhancing the hydraulic support fluid's extreme pressure and anti-wear properties and reducing friction. The ionic liquid also significantly improves the fluid's anti-corrosion properties. Furthermore, the hydraulic support fluid provided by this invention has low water quality requirements and is suitable for use in areas with high hardness levels, thus broadening its application range.

[0042] The present invention has no special requirements for the preparation method of the hydraulic support fluid. The components are directly mixed and stirred at room temperature for 30 to 40 minutes at a stirring speed of 300 to 400 rpm to obtain the hydraulic support fluid.

[0043] The ionic liquid, preparation method and application thereof, and hydraulic support fluid provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0044] The preparation of the ionic liquids in the following examples is as follows:

[0045] To a 98 wt % dimer acid (10 mmol) ethanol solution was added an equal amount of a 98 wt % aqueous solution of choline hydroxide (20 mmol), and the resulting mixture was magnetically stirred at room temperature for 12 h, then distilled under reduced pressure at 50° C., and finally dried in vacuo at 70° C. for 48 h to obtain the ionic liquid [cho][dimer].

[0046] Figure 1 FTIR spectra of dimer acid, choline hydroxide and ionic liquid [cho][dimer] are shown in Figure 1. Figure 1 It can be seen that dimer acid has a peak at 1760 cm -1 The absorption peak at is attributed to its carbonyl stretching; after one-step synthesis, due to the COO-N + The effect of bond formation, the carbonyl stretching of ionic liquid [cho][dimer] is from 1709cm -1 becomes 1573cm -1 ; The above results indicate that dimer acid anions exist in the ionic liquid, that is, the target ionic liquid [cho][dimer] is successfully synthesized after the dimer acid reacts with choline hydroxide.

[0047] Example 1

[0048] The hydraulic support fluid is composed of the following raw materials and their mass percentages: 0.5% ionic liquid [cho][dimer], 0.02% antifoaming agent (specifically MS 575), 0.01% dye (specifically toluidine), and the balance hard water with a hardness level of 15 prepared according to the MT 76-2011 standard; the above components are added to a container in sequence, mechanical stirring is started, and stirring is continued for 30 minutes to obtain a hydraulic support fluid.

[0049] Example 2

[0050] The hydraulic support fluid is composed of the following raw materials and their mass percentages: 1% ionic liquid [cho][dimer], 0.02% antifoaming agent (specifically MS 575), 0.01% dye (specifically toluidine), and the balance hard water with a hardness level of 15 prepared according to the MT 76-2011 standard; the above components are added to a container in sequence, mechanical stirring is started, and stirring is continued for 30 minutes to obtain a hydraulic support fluid.

[0051] Example 3

[0052] The hydraulic support fluid is composed of the following raw materials and their mass percentages: 1% ionic liquid [cho][dimer], 0.02% antifoaming agent (specifically MS 575), 0.01% dye (specifically toluidine), and the balance hard water with a hardness level of 20 prepared according to the MT 76-2011 standard; the above components are added to a container in sequence, mechanical stirring is started, and stirring is continued for 30 minutes to obtain a hydraulic support fluid.

[0053] Comparative Example 1

[0054] The preparation method of Comparative Example 1 is the same as that of Example 2, except that the ionic liquid prepared in this application is not added.

[0055] Comparative Example 2

[0056] The preparation method of Comparative Example 2 is the same as that of Example 2, except that the ionic liquid prepared in this application is not added, and the same mass fraction of a commonly used water-based hydraulic fluid compounding agent on the market - RM9707 (a water-based hydraulic fluid compounding agent produced by Zhongke Runmei (Qingdao) Materials Technology Co., Ltd.) is added.

[0057] Comparative Example 3

[0058] The preparation method of Comparative Example 3 is the same as that of Example 2, except that the ionic liquid is LP104 (alkyl imidazole hexafluorophosphate).

[0059] Comparative Example 4

[0060] The preparation method of Comparative Example 4 is the same as that of Example 2, except that the ionic liquid is a ricinoleic acid-based ionic liquid having the structure shown in Formula 2:

[0061]

[0062] Comparative Example 5

[0063] The preparation method of Comparative Example 5 is the same as that of Example 3, except that the ionic liquid prepared in the present application is not added, and the same mass fraction of a commonly used water-based hydraulic fluid compounding agent - RM9707 on the market is added.

[0064] The anti-rust performance of hydraulic support fluid was tested according to JB / T 9189-2016 "Test Method for Anti-Rust of Water-Based Materials - Cast Iron Chips Test"; the lubricity of hydraulic support fluid (P B ) puts forward clear requirements (>392N), according to GB / T 3142-2019 on the lubricity of hydraulic support fluid (P B) was tested; the tribological properties of the prepared hydraulic support fluid were evaluated using the friction coefficient obtained experimentally according to NB / SHVT0882-2014, Determination of Extreme Pressure Properties of Lubricating Materials - SRV Testing Machine Method. The test conditions were 25°C (temperature), 100N (load), 25Hz (frequency), 30min (run time), and 1mm (stroke). The storage stability test was a custom-built method, specifically: a 200mL sample was placed at -20°C for 21 days, then placed at room temperature. After the sample temperature returned to room temperature, the sample was observed for precipitation or precipitation.

[0065] The hydraulic support fluids prepared in the examples and comparative examples are in a fluid state, and typical test performance data thereof are shown in Tables 1 and 2.

[0066] Table 1 Liquid phase corrosion performance and P of hydraulic support fluids prepared in Examples and Comparative Examples B Performance data

[0067]

[0068] Table 2 Friction performance data of hydraulic support fluids prepared in Examples and Comparative Examples under SRV conditions

[0069] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Friction coefficient 0.13 0.11 0.14 0.4 0.24 0.31 0.15

[0070] As can be seen from Tables 1 and 2, the introduction of ionic liquids in this application can significantly improve the anti-corrosion performance, lubrication performance and anti-wear performance of the hydraulic support fluid (the smaller the SRV friction coefficient in Table 2, the better the anti-wear performance).

[0071] Figure 2 The storage stability test diagrams of Example 3 (left) and Comparative Example 5 (right) are shown. Figure 2 It can be seen that the introduction of ionic liquid in the present application can significantly improve the storage stability of the hydraulic support fluid. Even in the hard water level of 20 prepared according to the MT 76-2011 standard, it can still remain stable without precipitation; while the hydraulic support fluid of Comparative Example 5 is turbid and the system is unstable.

[0072] 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 principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An ionic liquid, characterized in that It has the structure shown in formula 1:

2. The method for preparing the ionic liquid according to claim 1, characterized in that: The method comprises the following steps: mixing an alcohol solution of dimer acid and an aqueous solution of choline hydroxide, and performing an esterification reaction to obtain the ionic liquid.

3. The preparation method according to claim 2, characterized in that The molar ratio of the dimer acid to choline hydroxide is 1:

2.

4. The preparation method according to claim 2, characterized in that The alcohol solution of dimer acid comprises an ethanol solution of dimer acid; the concentration of dimer acid in the alcohol solution of dimer acid is 95-98 wt %.

5. The preparation method according to claim 2, characterized in that The concentration of choline hydroxide in the aqueous solution of choline hydroxide is 95-98 wt %.

6. The preparation method according to any one of claims 2 to 5, characterized in that: The temperature of the esterification reaction is 20-35° C., and the time is 12-24 hours.

7. The preparation method according to claim 2, characterized in that After the esterification reaction is completed, the obtained product liquid is subjected to reduced pressure distillation and vacuum drying.

8. Use of the ionic liquid according to claim 1 or the ionic liquid prepared by the preparation method according to any one of claims 2 to 7 in hydraulic support fluid.

9. A hydraulic support fluid, characterized in that: Calculated by mass percentage, it includes 0.1 to 1.5% of ionic liquid and the balance of water; The ionic liquid is the ionic liquid according to claim 1 or the ionic liquid prepared by the preparation method according to any one of claims 2 to 7.

10. The hydraulic support fluid according to claim 9, characterized in that: The hydraulic support fluid also includes 0.01-0.1% of anti-foaming agent and 0.01-0.02% of dye.

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