A water-based lubricant for hydraulic support and preparation method thereof

Abstract

The present invention discloses a water-based lubricant for hydraulic support and a preparation method thereof. The water-based lubricant is prepared from 1 to 1.3 parts by weight of fatty alcohol block polyether carboxylic acid, 0.1 to 0.3 parts by weight of glycerol, 0.1 to 0.5 parts by weight of polyethylene glycol, 0.05 to 0.1 parts by weight of boric acid and 1 to 1.2 parts by weight of triethanolamine. The water-based lubricant for hydraulic support in the present invention has good lubricity and stability, does not react with calcium and magnesium ions in mine water, can avoid blockage caused by precipitation of fatty acid soap, does not cause the problem of frequent seal damage caused by insufficient local lubrication, makes the hydraulic support liquid supply more reliable, and the lubricant preparation method has a simple process, is easy to operate and has a low cost.

Description

Technical Field

[0001] The invention belongs to the field of transmission media for coal mine hydraulic supports, and in particular, the invention relates to a water-based lubricant for hydraulic supports and a preparation method thereof. Background Art

[0002] Coal mine hydraulic supports mainly rely on aqueous hydraulic fluid, columns and jacks to achieve four basic actions: raising, lowering, pushing and moving. With the continuous improvement of automation and intelligence of coal mining working faces, the hydraulic support system is required to operate more safely, reliably and efficiently. The filtration accuracy of hydraulic systems in various links is getting higher and higher (the current filtration accuracy is 25μm), so the lubricity, stability and corrosion resistance of aqueous hydraulic fluids are required to be higher. The key to achieving technical improvement of aqueous hydraulic fluids lies in the development of core additives such as lubrication and rust prevention, as well as the multifunctionality of core additives, that is, the same additive has the functions of lubrication, rust prevention, emulsification, etc.

[0003] The water-based lubricating additives reported and used at home and abroad include sulfonated castor oil, fatty acid esters, modified oleic acid, oleic acid amide, long-chain carboxylates, etc. Aqueous hydraulic fluids are generally prepared directly from mine water and related functional additive complexes (including lubricating additives) in mining areas. 2+ Mg 2+ Isocation, SO4 2- , Cl - 、HCO3 - When the mine water quality changes suddenly and the concentration of the prepared liquid is too low, the stability and reliability of the aqueous hydraulic fluid system will be insufficient. Conventional lubricants use anionic surfactants. 2+ Mg 2+ Fatty acid soap will be formed. In the case of high hardness or low concentration of the prepared liquid, 1) fatty acid soap will precipitate, resulting in insufficient local lubricity, cylinder wear, and frequent seal replacement; 2) fatty acid soap will precipitate, adsorb coal dust and aggregate, causing clogging of the filter element and rust of the hydraulic support cylinder. Therefore, it is necessary to develop a water-based lubricant for hydraulic supports that can resist Ca in mine water. 2+ Mg 2+ Fluctuations can be prevented to avoid the precipitation of fatty acid soaps, ensuring the accuracy of the hydraulic support movements and contributing to the automation and intelligence of the coal mining face. Summary of the invention

[0004] The present invention is based on the inventor's discovery and understanding of the following facts and problems: the quality of mine water fluctuates greatly, especially when the hardness is high or the liquid concentration is low. When a conventional carboxylate-type anion lubricant is used, the lubricant combines with calcium and magnesium ions to precipitate, resulting in insufficient local lubricity, cylinder wear, and frequent seal replacement; the precipitate adsorbs coal dust and aggregates, causing blockage of the filter element and rust of the hydraulic support cylinder, triggering malfunction of the solenoid valve components, resulting in insufficient fluid supply flow in the hydraulic system, failure to reach the rated working pressure, and slow movement of the hydraulic support, affecting the safety, efficiency and high yield of the coal mine, and being unfavorable to the automation and intelligence of the coal mining face.

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the present invention provides a water-based lubricant for a hydraulic support and a preparation method thereof.

[0006] On the one hand, an embodiment of the present invention provides a water-based lubricant for a hydraulic support, which is prepared from 1 to 1.3 parts by weight of a fatty alcohol block polyether carboxylic acid, 0.1 to 0.3 parts by weight of propylene glycol, 0.1 to 0.5 parts by weight of polyethylene glycol, 0.05 to 0.1 parts by weight of boric acid, and 1 to 1.2 parts by weight of triethanolamine.

[0007] The water-based lubricant for the hydraulic support of the embodiment of the present invention is prepared by reasonably selecting fatty alcohol block polyether carboxylic acid and triethanolamine as reaction raw materials and using a mixture of propylene glycol, polyethylene glycol and boric acid as a catalyst. The lubricant is a non-ionic surfactant and does not react with calcium and magnesium ions in mine water. It can adapt well to fluctuations in mine water quality and concentration of the prepared liquid, can significantly improve the stability of the aqueous hydraulic fluid itself, can avoid blockage caused by the precipitation of fatty acid soaps, and will not cause the problem of frequent seal damage caused by insufficient local lubrication, so that the hydraulic support fluid supply is more reliable.

[0008] In some embodiments of the present invention, the water-based lubricant for the hydraulic support is preferably prepared from 1 part by weight of fatty alcohol block polyether carboxylic acid, 0.1 part by weight of propylene glycol, 0.1 part by weight of polyethylene glycol, 0.05 to 0.1 part by weight of boric acid, and 1 to 1.2 parts by weight of triethanolamine.

[0009] In some embodiments of the present invention, the structural formula of the fatty alcohol block polyether carboxylic acid is RO(C2H4O) m (C3H6O) n CH2COOH, wherein: m = 6 to 14, preferably m = 8; n = 0 to 6, preferably n = 3; R is C 12 -C 18 Alkyl, preferably R is C 16 alkyl.

[0010] In some embodiments of the present invention, the average molecular weight of the fatty alcohol block polyether carboxylic acid is 600-800.

[0011] In some embodiments of the present invention, the water-based lubricant for the hydraulic support is prepared by a method comprising the following steps: (1) stirring and mixing fatty alcohol block polyether carboxylic acid with propylene glycol, polyethylene glycol, and boric acid until the mixed solution is uniform and transparent; (2) adding triethanolamine to the mixed solution and mixing evenly, and stirring and reacting at 120-140° C. for 1.5-2 hours to obtain the water-based lubricant for the hydraulic support.

[0012] Another aspect of the present invention is to provide a method for preparing the water-based lubricant for the hydraulic support, comprising the following steps:

[0013] (1) Stir and mix the fatty alcohol block polyether carboxylic acid, glycerol, polyethylene glycol, and boric acid until the mixture is uniform and transparent;

[0014] (2) Add triethanolamine to the mixed solution and mix evenly, heat and stir to react, so as to obtain the water-based lubricant for the hydraulic support.

[0015] The preparation method of the water-based lubricant for the hydraulic support of the embodiment of the present invention is to use fatty alcohol block polyether carboxylic acid and triethanolamine as reaction raw materials, use a mixture of propylene glycol, polyethylene glycol and boric acid as a catalyst, and heat and stir the reaction to obtain the water-based lubricant for the hydraulic support. The preparation method has a simple process, normal pressure, no need for further purification, and is easy to operate. Moreover, by reasonably designing the order of adding raw materials, it can ensure that the capacity expansion of each raw material is better, which is conducive to the reaction.

[0016] In some embodiments of the present invention, in step (2), the reaction temperature of the heating and stirring reaction is 120-140° C., and the reaction time is 1.5-2 h.

[0017] In some embodiments of the present invention, in step (2), the stirring speed of the heating and stirring reaction is 60 to 90 r / min.

[0018] The advantages and beneficial effects of the present invention are:

[0019] (1) The water-based lubricant for the hydraulic support of the embodiment of the present invention is prepared by using fatty alcohol block polyether carboxylic acid and triethanolamine as reaction raw materials and a mixture of propylene glycol, polyethylene glycol and boric acid as a catalyst. The obtained water-based lubricant for the hydraulic support has good lubricity and stability, does not react with calcium and magnesium ions in mine water, has good resistance to calcium and magnesium ion fluctuations, can adapt well to fluctuations in mine water quality and concentration of the prepared solution, and can avoid blockage caused by the precipitation of fatty acid soaps, resulting in problems such as insufficient local lubricity.

[0020] (2) The method for preparing the water-based lubricant for the hydraulic support of the embodiment of the present invention overcomes the problem of limited solubility and slow dispersion of fatty alcohol block polyether carboxylic acid in water, so that it can be well dissolved in mine water. In addition, the preparation method is operated at normal pressure, and the product does not need further purification. The process is simple, easy to operate, and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the infrared spectrum of the fatty alcohol block polyether carboxylic acid in Example 1 of the present invention and the water-based lubricant No. 1 for hydraulic support.

[0022] Figure 2 It is a schematic diagram of the test of the four-ball friction and wear testing machine; among them, 1 is a fixed steel ball, 2 is a test cup, 3 is a moving steel ball, and 4 is a chuck.

[0023] Figure 3 This is a photograph of the wear spots of the water-based lubricant No. 1 prepared in Example 1 of the present invention at 392N.

[0024] Figure 4 This is a photograph of the wear spots of the water-based lubricant No. 1 prepared in Example 1 of the present invention under 471N.

[0025] Figure 5 This is a photo of the wear spots of the water-based lubricant No. 1 prepared in Example 1 of the present invention under 510N.

[0026] Figure 6 This is a photograph of the wear spots of the water-based lubricant No. 1 prepared in Example 1 of the present invention at 549N.

[0027] Figure 7 This is a photo of the wear spots of lubricant No. IV prepared in comparative example 1 under 392N.

[0028] Figure 8 This is a photo of the wear spots of lubricant No. IV prepared in comparative example 1 under 431N. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0030] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by those having ordinary skills in the field to which the present invention belongs.

[0031] On the one hand, an embodiment of the present invention provides a water-based lubricant for a hydraulic support, which is prepared from 1 to 1.3 parts by weight of fatty alcohol block polyether carboxylic acid, 0.1 to 0.3 parts by weight of propylene glycol, 0.1 to 0.5 parts by weight of polyethylene glycol, 0.05 to 0.1 parts by weight of boric acid and 1 to 1.2 parts by weight of triethanolamine.

[0032] The water-based lubricant for the hydraulic support of the embodiment of the present invention preferably uses fatty alcohol block polyether carboxylic acid and triethanolamine as reaction raw materials, and uses a mixture of propylene glycol, polyethylene glycol and boric acid as a catalyst. The water-based lubricant for the hydraulic support has the following advantages: good resistance to calcium and magnesium ion fluctuations, which can avoid the precipitation problem of aqueous hydraulic fluid due to fluctuations in mine water quality, high hardness or low liquid concentration, and has good lubricity and stability.

[0033] In some embodiments of the present invention, the water-based lubricant for the hydraulic support is preferably prepared from 1 part by weight of fatty alcohol block polyether carboxylic acid, 0.1 part of propylene glycol, 0.1 part of polyethylene glycol, 0.05-0.1 parts of boric acid and 1-1.2 parts of triethanolamine; wherein, the saponification of boric acid and propylene glycol can improve the original ionization of the product, assist in improving the product's resistance to hard water, and can also improve the product's lubricity; in addition to playing the role of esterification reaction in the formula, triethanolamine also has the functions of adjusting pH value, buffering and corrosion inhibition.

[0034] In some embodiments of the present invention, the structural formula of the fatty alcohol block polyether carboxylic acid is RO(C2H4O) m (C3H6O) n CH2COOH, wherein: m = 6 to 14, preferably m = 8; n = 0 to 6, preferably n = 3; R is C 12 -C 18 Alkyl, preferably R is C 16 alkyl.

[0035] In some embodiments of the present invention, the average molecular weight of the fatty alcohol block polyether carboxylic acid is 600-800.

[0036] In some embodiments of the present invention, a water-based lubricant for a hydraulic support is prepared by a method comprising the following steps: (1) stirring and mixing a fatty alcohol block polyether carboxylic acid with propylene glycol, polyethylene glycol, and boric acid until the mixed solution is uniform and transparent; (2) adding triethanolamine to the mixed solution and mixing the mixture evenly, and stirring and reacting at 120 to 140° C. for 1.5 to 2 hours to obtain a water-based lubricant for a hydraulic support.

[0037] The embodiment of the present invention selects fatty alcohol block polyether carboxylic acid and triethanolamine as the reaction raw materials of the water-based lubricant, mainly because: first, the fatty alcohol part in the fatty alcohol block polyether carboxylic acid has a certain lubricity; second, the hydrophilicity and hydrophobicity of the lubricant can be adjusted by adjusting the amount of ethylene oxide (C2H4O) and propylene oxide (C3H6O) in the block polyether part to ensure its solubility in water, and this part has the performance of a non-ionic surfactant; third, the carboxylic acid part in the fatty alcohol block polyether carboxylic acid is an active group, which can undergo acid-base reaction or esterification reaction, and at the same time has the performance of anionic surfactant; the fatty alcohol block polyether carboxylic acid has the comprehensive performance of anionic and non-ionic surfactants, has a certain dispersibility and self-emulsification, and encounters Ca in mine water 2+ Mg 2+ The fluctuation of the temperature can effectively avoid the precipitation of fatty acid soaps; triethanolamine has active alcohol hydroxyl groups, which can undergo esterification and other reactions, and is also a good buffer.

[0038] Another aspect of the present invention is to provide a method for preparing the water-based lubricant for the hydraulic support, comprising the following steps:

[0039] (1) Stir and mix the fatty alcohol block polyether carboxylic acid, glycerol, polyethylene glycol, and boric acid until the mixture is uniform and transparent;

[0040] (2) Add triethanolamine to the mixed solution and mix evenly, heat and stir to react, and prepare a water-based lubricant for the hydraulic support.

[0041] The preparation method of the water-based lubricant for the hydraulic support in the embodiment of the present invention is to use fatty alcohol block polyether carboxylic acid and triethanolamine as reaction raw materials, use a mixture of propylene glycol, polyethylene glycol and boric acid as a catalyst, and heat and stir the reaction to obtain the water-based lubricant for the hydraulic support. The preparation method has a simple process, normal pressure, no need for further purification, and is easy to operate. In addition, by reasonably designing the order of adding raw materials, the catalyst is evenly dispersed in the mixed liquid in advance, which helps to timely adsorb water generated by the reaction and promote the reaction to move to the target product.

[0042] In some embodiments of the present invention, in step (2), the reaction temperature of the heated stirring reaction is 120-140°C, for example, 120°C, 125°C, 130°C, 140°C, etc.; the reaction time is 1.5-2h, for example, 1.5h, 1.8h, 2h, etc.

[0043] In some embodiments of the present invention, in step (2), the stirring speed of the heated stirring reaction is 60 to 90 r / min, for example, 60 r / min, 75 r / min, 80 r / min, 85 r / min, 90 r / min, etc.

[0044] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments.

[0045] Example 1

[0046] This embodiment provides a water-based lubricant for a hydraulic support, which is prepared from 1 part by weight of a fatty alcohol block polyether carboxylic acid, 0.1 part by weight of propylene glycol, 0.1 part by weight of polyethylene glycol, 0.1 part by weight of boric acid, and 1 part by weight of triethanolamine;

[0047] The method for preparing the water-based lubricant for the hydraulic support comprises the following steps:

[0048] (1) adding a fatty alcohol block polyether carboxylic acid having an average molecular weight of 638, glycerol, polyethylene glycol and boric acid into a reaction kettle, and stirring and mixing until the mixed solution becomes uniform and transparent;

[0049] (2) Add triethanolamine to the mixed solution and mix well, and heat and stir at 120° C. and 90 r / min for 2 hours. After the reaction is completed, cool and lower the temperature to obtain water-based lubricant No. 1 for hydraulic support.

[0050] Figure 1 The infrared spectra of the fatty alcohol block polyether carboxylic acid used as the reaction raw material in this example and the water-based lubricant No. Ⅰ for the hydraulic support prepared are shown in FIG. Figure 1 It can be seen that the hydraulic support water-based lubricant No. Ⅰ is at 3350cm -1 There is a broad absorption peak at 1595cm -1 There is also an absorption peak, indicating the presence of an amide bond; -1 ~1033cm -1 The absorption peak indicates the presence of fatty ether bonds.

[0051] Example 2

[0052] This embodiment provides a water-based lubricant for a hydraulic support, which is prepared from 1 part by weight of a fatty alcohol block polyether carboxylic acid, 0.1 part by weight of glycerol, 0.1 part by weight of polyethylene glycol, 0.08 part by weight of boric acid, and 1.1 part by weight of triethanolamine;

[0053] The method for preparing the water-based lubricant for the hydraulic support comprises the following steps:

[0054] (1) adding a fatty alcohol block polyether carboxylic acid having an average molecular weight of 696, glycerol, polyethylene glycol and boric acid into a reaction kettle, and stirring and mixing until the mixed solution becomes uniform and transparent;

[0055] (2) Add triethanolamine to the mixed solution and mix well, and heat and stir at 130°C and 80 r / min for 1.5 hours. After the reaction is completed, cool and obtain water-based lubricant No. 2 for hydraulic support.

[0056] Example 3

[0057] This embodiment provides a water-based lubricant for a hydraulic support, which is prepared from 1 part by weight of a fatty alcohol block polyether carboxylic acid, 0.1 part by weight of glycerol, 0.1 part by weight of polyethylene glycol, 0.05 part by weight of boric acid, and 1.2 parts by weight of triethanolamine;

[0058] The method for preparing the water-based lubricant for the hydraulic support comprises the following steps:

[0059] (1) adding a fatty alcohol block polyether carboxylic acid having an average molecular weight of 768, glycerol, polyethylene glycol and boric acid into a reaction kettle, and stirring and mixing until the mixed solution becomes uniform and transparent;

[0060] (2) Add triethanolamine to the mixed solution and mix well, and heat and stir at 140°C and 60 r / min for 1.5 hours. After the reaction is completed, cool and obtain water-based lubricant No. III for hydraulic support.

[0061] Comparative Example 1

[0062] This comparative example provides a lubricant for a hydraulic support, which is prepared from 1 part by mass of a fatty alcohol block polyether carboxylic acid, 0.1 part by mass of glycerol, 0.1 part by mass of polyethylene glycol, 0.08 part by mass of boric acid, and 1.1 parts by mass of triethanolamine;

[0063] The method for preparing the lubricant for the hydraulic support comprises the following steps:

[0064] (1) adding a fatty alcohol block polyether carboxylic acid having an average molecular weight of 696, glycerol, polyethylene glycol and boric acid into a reaction kettle, and stirring and mixing until the mixed solution becomes uniform and transparent;

[0065] (2) Add triethanolamine to the mixed solution and mix well. Stir the mixture at room temperature at a speed of 80 r / min for 1.5 hours. After the reaction is completed, lubricant No. IV is obtained.

[0066] The water-based lubricants (No. Ⅰ, No. Ⅱ and No. Ⅲ) prepared in the above Examples 1-3, the lubricant No. Ⅳ prepared in Comparative Example 1, and 8 substances, namely, castor oil salt, oleic acid triethanolamine soap, Taigu oil triethanolamine soap and fatty alcohol block polyether carboxylic acid, were prepared into 0.5% solutions with deionized water, and the lubricity was tested according to GB / T 3142 "Determination of load-bearing capacity of lubricants - Four-ball method"; with reference to MT 76-2011 "Emulsified oil, concentrate and high water content hydraulic fluid for hydraulic support", 500 mg / L of artificial hard water was used to prepare 0.3%, 0.5%, 0.8%, 1% and 2% dilutions of the above 8 additives respectively; 1000 mg / L, 1500 mg / L and 2000 mg / L of artificial hard water were used to prepare 2% dilutions of the above 8 substances respectively, and the stability of the above dilutions was tested under (70±2)°C and 168h conditions. The test data are shown in Table 1.

[0067] Table 1 Performance test data

[0068]

[0069] Note: "√" represents a uniform and transparent solution, indicating that the additive does not produce soap in water of different concentrations and different hardnesses, and the additive is relatively stable; "×" represents the presence of flocs, indicating that the additive produces soap in water of different concentrations and different hardnesses, and the additive is unstable. If used, there is a risk of causing filter element clogging; "※" represents debris-like precipitates, indicating that the additive produces soap in water of different concentrations and different hardnesses, and the additive is unstable. If used, there is a risk of causing filter element clogging; "↓" represents incomplete dissolution, indicating that the additive has limited solubility in water of different concentrations and different hardnesses, and its water solubility needs to be changed before it can be used.

[0070] Compared with Example 1, Example 2 of the present invention has the same raw material ratio and reaction time. The only difference is that Lubricant No. II in Example 2 of the present invention is prepared by reaction at 130°C, while Lubricant No. IV in Comparative Example 1 is prepared by reaction at room temperature. As shown in Table 1, after testing the lubricity of the two lubricants, it is found that Lubricant No. II prepared in Example 2 has a P B The value is 510N; while the lubricant No. IV in Comparative Example 1 has a P BThe value is only 392N. In comparison, the water-based lubricant prepared by the preparation method of Example 2 of the present invention has a lubricating ability improved by more than 20%, and has stronger lubricity. It can also be found that when a fatty alcohol block polyether carboxylic acid is used as a lubricant, it is difficult to completely dissolve in water, while the water-based lubricant synthesized by the present invention overcomes the problem of limited solubility and slow dispersion of fatty alcohol block polyether carboxylic acid in water, and can be well dissolved in mine water. In addition, by comparing the stability of ricinoleate, oleic acid triethanolamine soap, and Taiko oil triethanolamine soap in hard water, it can be seen that the water-based lubricant for hydraulic support prepared by the embodiment of the present invention has better resistance to calcium and magnesium ion fluctuations and water solubility.

[0071] Lubricity test:

[0072] The lubricity test is evaluated using a four-ball testing machine. The additive and water are mixed into a test solution according to the set concentration, and the maximum no-seizure load P of the test solution is determined according to the test method and steps of GB / T3142. B The test piece of the four-ball machine is 4 grade II bearing steel balls (diameter Φ12.7mm, material GCr15) with the same diameter, arranged in an equilateral tetrahedron. The three lower steel balls are fixed together with an oil box and covered with test fluid. The hydraulic system applies load to the steel balls from bottom to top. The upper ball rotates at a speed of 1450r / min±50r / min. There is sliding friction between the upper and lower balls. The test diagram of the four-ball friction and wear tester is as follows: Figure 2 The four-ball machine is set to apply different loads (such as 392N, 431N, 471N, 510N, 549N, etc.) to the steel balls. The running time is set to 10 seconds. After the running is completed, the wear spot diameter of the steel ball is measured. By looking up the table, the highest load without seizure under the test conditions can be obtained, that is, the maximum no-seizure load P B Value, which represents the oil film strength and reflects the degree of lubricity.

[0073] The water-based lubricant No. Ⅰ prepared in Example 1 of the present invention was prepared into a 0.5% solution and added to the four-ball machine with a load of 392N and a running time of 10 seconds. The wear spot photo is as follows: Figure 3 The results show that the longitudinal wear scar diameter of the steel ball is 0.326 mm, and the transverse wear scar diameter is 0.305 mm, which is smaller than the 0.35 mm required by GB / T 3142, indicating that the solution P B The value is not less than 392N.

[0074] The water-based lubricant No. Ⅰ prepared in Example 1 of the present invention was prepared into a 0.5% solution and added to the four-ball machine with a load of 471N and a running time of 10 seconds. The wear spot photo is as follows: Figure 4The results show that the longitudinal wear scar diameter of the steel ball is 0.354 mm, and the transverse wear scar diameter is 0.313 mm, which is smaller than the 0.37 mm required by GB / T 3142, indicating that the solution P B The value is not less than 471N.

[0075] The water-based lubricant No. Ⅰ prepared in Example 1 of the present invention was prepared into a 0.5% solution and added to the four-ball machine with a load of 510N and a running time of 10 seconds. The wear spot photo is as follows: Figure 5 The results show that the longitudinal wear scar diameter of the steel ball is 0.379 mm, and the transverse wear scar diameter is 0.345 mm, which is smaller than the 0.38 mm required by GB / T 3142, indicating that the solution P B The value shall not be less than 510N.

[0076] The water-based lubricant No. Ⅰ prepared in Example 1 of the present invention was prepared into a 0.5% solution and added to the four-ball machine with a load of 549N and a running time of 10 seconds. The wear spot photo is as follows: Figure 6 The results show that the longitudinal wear scar diameter of the steel ball is 0.494 mm, which is larger than the 0.39 mm required by GB / T 3142, indicating that the solution P B The value is less than 549N.

[0077] The water-based lubricant No. IV prepared in Comparative Example 1 was prepared into a 0.5% solution and added to the four-ball machine with a load of 392N and a running time of 10 seconds. The wear spot photo is shown in FIG. Figure 7 The results show that the longitudinal wear scar diameter of the steel ball is 0.341 mm, and the transverse wear scar diameter is 0.335 mm, which is smaller than the 0.35 mm required by GB / T 3142, indicating that the solution P B The value is not less than 392N.

[0078] The water-based lubricant No. IV prepared in Comparative Example 1 was prepared into a 0.5% solution and added to the four-ball machine with a load of 431N and a running time of 10 seconds. The wear spot photo is shown in FIG. Figure 8 The results show that the longitudinal wear scar diameter of the steel ball is 0.471 mm, and the transverse wear scar diameter is 0.346 mm, which is larger than the 0.36 mm required by GB / T 3142, indicating that the solution P B The value is less than 431N.

[0079] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A water-based lubricant for a hydraulic support, characterized in that: The water-based lubricant for the hydraulic support is prepared from 1 to 1.3 parts by mass of fatty alcohol block polyether carboxylic acid, 0.1 to 0.3 parts by mass of glycerol, 0.1 to 0.5 parts by mass of polyethylene glycol, 0.05 to 0.1 parts by mass of boric acid and 1 to 1.2 parts by mass of triethanolamine; The structural formula of the fatty alcohol block polyether carboxylic acid is RO(C2H4O) m (C3H6O) n CH2COOH, where: m = 6 to 14; n = 0 to 6; R is C 12 -C 18 alkyl; The average molecular weight of the fatty alcohol block polyether carboxylic acid is 600 to 800; The water-based lubricant for the hydraulic support is prepared by a method comprising the following steps: (1) stirring and mixing fatty alcohol block polyether carboxylic acid with propylene glycol, polyethylene glycol, and boric acid until the mixed solution is uniform and transparent; (2) adding triethanolamine to the mixed solution and mixing evenly, and stirring and reacting at 120 to 140° C. for 1.5 to 2 hours to obtain the water-based lubricant for the hydraulic support.

2. The water-based lubricant for hydraulic support according to claim 1, characterized in that: The water-based lubricant for the hydraulic support is prepared from 1 part by mass of fatty alcohol block polyether carboxylic acid, 0.1 part by mass of glycerol, 0.1 part by mass of polyethylene glycol, 0.05 to 0.1 part by mass of boric acid and 1 to 1.2 parts by mass of triethanolamine.

3. The water-based lubricant for hydraulic support according to claim 1, characterized in that: The structural formula of the fatty alcohol block polyether carboxylic acid is RO(C2H4O) m (C3H6O) n CH2COOH, where: m=8; n=3; R is C 16 alkyl.

4. The method for preparing the water-based lubricant for hydraulic support according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Stir and mix the fatty alcohol block polyether carboxylic acid, glycerol, polyethylene glycol and boric acid until the mixture is uniform and transparent; (2) Add triethanolamine to the mixed solution and mix evenly, heat and stir to react, and obtain the water-based lubricant for the hydraulic support; the reaction temperature of the heating and stirring reaction is 120 to 140° C., and the reaction time is 1.5 to 2 hours.

5. The method for preparing a water-based lubricant for a hydraulic support according to claim 4, characterized in that: In step (2), the stirring speed of the heating and stirring reaction is 60 to 90 r / min.

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