Metal cutting fluid and preparation method thereof

Abstract

The invention discloses a metal cutting fluid and a preparation method thereof.The metal cutting fluid is prepared from base oil, sucrose fatty acid ester, deionized water, glycerin, a lubricant, an antirust agent, a penetrant, modified molybdenum disulfide and phase-change heat storage microcapsules, the phase-change heat storage microcapsules can absorb heat and reduce temperature, heat generated in the cutting machining process can be taken away in time, and the cutting efficiency is improved. Compared with the existing base oil, the metal cutting fluid has the advantages that the temperature rise is obviously reduced, the metal cutting fluid cannot be decomposed due to high temperature, the volatilization is not easy, the service life of the cutting fluid is prolonged, the use amount of the cutting fluid can be reduced, the metal cutting fluid has good lubricity, rust resistance, corrosion resistance and stability, and the cutting quality can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cutting fluid, more particularly to a metal cutting fluid and a preparation method thereof. BACKGROUND

[0002] The cutting fluid is an industrial liquid used for cooling and lubricating the tool and workpiece in the process of metal cutting, wherein the cutting fluid on the market is mainly divided into two types of oil-based cutting fluid and water-based cutting fluid, however, the above two types of cutting fluid generally have the following problems: poor wear resistance, poor rust resistance, the lubricating effect and the cooling effect cannot be simultaneously achieved, the service life of the cutting fluid is short, and in order to achieve good cooling effect, a large amount of cutting fluid must be used, which greatly increases the cost. SUMMARY

[0003] The present application aims to overcome the above-mentioned defects in the prior art, and provides a metal cutting fluid with good lubricity, rust resistance, corrosion resistance and stability, good cooling effect, and improved cutting quality, and a preparation method thereof.

[0004] To achieve the above-mentioned purpose, the first aspect of the present application provides a preparation method of a metal cutting fluid, comprising the following steps: (1) dispersing 8-10 parts of nano-graphite powder into 10-30 parts of anhydrous ethanol and performing ultrasonic treatment, then adding 2-4 parts of 3-aminopropyltrimethoxysilane for modification treatment, and then obtaining supermolecular structure nano-graphite powder after washing and drying, mixing the supermolecular structure nano-graphite powder with 1-3 parts of ammonium bicarbonate, and then performing ball milling in liquid carbon dioxide by using a ball milling method, and grinding to a particle size of 0.1-0.4 mm to obtain modified supermolecular structure nano-graphite powder; (2) adding 2-4 parts of a cationic dispersant to 10-15 parts of a trimethylol aminomethane hydrochloride solution, stirring uniformly to obtain a dispersant solution, then adding the modified supermolecular structure nano-graphite powder prepared in step (1) into the dispersant solution, stirring and performing ultrasonic dispersion treatment, then adding 3-5 parts of polyether sulfone, 4-8 parts of methyl methacrylate and 5-7 parts of an emulsifier, emulsifying and ultrasonic dispersing under high-speed stirring at 800-1000 r / min to obtain a phase change microcapsule emulsion, and then drying at a temperature of 70-80℃ for 6-12 hours to obtain a phase change heat storage microcapsule; (3) under the condition of 70-90℃, 60-80 parts of base oil, 2-4 parts of sucrose fatty acid ester, 5-8 parts of glycerol, 3-5 parts of lubricant, 2-4 parts of anti-rust agent, 6-8 parts of penetrant, 3-5 parts of modified molybdenum disulfide and the phase change heat storage microcapsule prepared in step (2) are all mixed and stirred uniformly, the stirring speed is set to 1800-4000 r / min, then 1-5 parts of pH adjuster is added, mixed uniformly and cooled to room temperature to obtain the metal cutting fluid.

[0005] Preferably, the cationic dispersant is set to dodecyl trimethyl ammonium bromide or hexadecyl trimethyl ammonium chloride.

[0006] Preferably, the emulsifier is set to long-chain fatty alcohol polyoxyethylene propylene ether or alkyl phenol polyoxyethylene ether.

[0007] Preferably, the base oil is set to at least one of mineral base oil, synthetic base oil or vegetable base oil.

[0008] Preferably, the lubricant is set to polyoxyethylene alkyl acyl alcohol amine.

[0009] Preferably, the anti-rust agent is set to benzotriazole or N, N'-methylene bis morpholine.

[0010] Preferably, the preparation method of the penetrant is as follows: The acrylic acid copolymer emulsion, 2-ethylhexyl sodium sulfate, tannic acid and propylene glycol butyl ether are stirred under the condition of below 60℃ to obtain the penetrant. Preferably, the mass ratio of the acrylic acid copolymer emulsion, 2-ethylhexyl sodium sulfate, tannic acid and propylene glycol butyl ether is 10:2:1:3.

[0011] Preferably, the preparation method of the modified molybdenum disulfide is as follows: The nano molybdenum disulfide is placed in a heating furnace and calcined under the condition of 200-230℃ for 1-2 hours, then cooled to room temperature, then the nano molybdenum disulfide is placed in ethanol, then hexadecyl trimethyl ammonium bromide and polytetrafluoroethylene are added, stirred under the condition of 80-90℃ for 10-12 hours, then placed, filtered, washed with deionized water, dried to obtain the modified molybdenum disulfide.

[0012] Preferably, the mass ratio of the nano molybdenum disulfide, ethanol, hexadecyl trimethyl ammonium bromide and polytetrafluoroethylene is 30:60:5:1.

[0013] Preferably, the pH adjuster is set to at least one of isopropyl alcohol amine, cyclohexylamine or fatty alcohol acyl.

[0014] The second aspect of the present application provides a metal cutting fluid prepared by the preparation method of the metal cutting fluid.

[0015] Compared with the prior art, the present application has the following advantages: 1、The metal cutting fluid is made of base oil, sucrose fatty acid ester, deionized water, glycerol, lubricant, antirust agent, penetrant, modified molybdenum disulfide and phase change heat storage microcapsule, the phase change heat storage microcapsule can absorb heat and cool down, can timely take away the heat generated in the cutting process, compared with the existing base oil, the temperature rise is significantly reduced, and it will not be decomposed due to high temperature, not easy to volatilize, prolong the service life of the cutting fluid, can reduce the amount of cutting fluid, the metal cutting fluid has good lubricity, rust resistance, corrosion resistance and stability, can improve the cutting quality.

[0016] 2、The present application uses 3-aminopropyltrimethoxysilane to modify the supramolecular structure of nano graphite powder, introduces amino functional groups on the surface of the nano graphite powder carrier, improves the thermal conductivity of the nano graphite powder, and the phase change heat storage microcapsule has small particle size, large specific surface area and large heat conduction area.

[0017] 3、The coating shell of the phase change heat storage microcapsule is made of polyether sulfone+methyl methacrylate dual material, has good thermal stability, corrosion resistance and mechanical strength, is not easy to break, and because the cationic dispersant is added during the preparation of the phase change heat storage microcapsule, the phase change heat storage microcapsule can be uniformly dispersed in the base oil, and the phase change heat storage microcapsule will not sink and is not easy to agglomerate.

[0018] 4、The present application adds modified molybdenum disulfide, which is modified by hexadecyl trimethyl ammonium bromide and polytetrafluoroethylene, can improve the dispersity and compatibility of the modified molybdenum disulfide in the cutting fluid, make the thermal stability and chemical stability of the modified molybdenum disulfide more fully expressed in the cutting fluid, and enhance the lubricity and pressure resistance and wear resistance of the cutting fluid.

[0019] In addition, after the nano molybdenum disulfide is put into a heating furnace for pretreatment, the internal structure of the nano molybdenum disulfide can be loosened and dispersed, improving its dispersity and stability in the cutting fluid.

[0020] 5、The present application also adds sucrose fatty acid ester, which has the effect of heat absorption and cooling. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0022] Figure 1 is a structural schematic diagram of the phase change heat storage microcapsule provided by the embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. EMBODIMENT

[0024] A preparation method of a metal cutting fluid, comprising the following steps: (1) 10 parts of nano graphite powder are dispersed into 30 parts of anhydrous ethanol and ultrasonic treatment is performed, then 4 parts of 3-aminopropyltrimethoxysilane is added for modification treatment, and after washing and drying, supermolecular structure nano graphite powder is obtained. The supermolecular structure nano graphite powder is mixed with 1 part of ammonium bicarbonate, and then ball milling is performed in liquid carbon dioxide by using a ball milling method, and the particle size is ground to 0.1 mm to obtain modified supermolecular structure nano graphite powder; (2) 4 parts of a cationic dispersant is added into 15 parts of a trimethylol aminomethane hydrochloride solution, and after stirring uniformly, a dispersant solution is obtained. Then the modified supermolecular structure nano graphite powder prepared in step (1) is added into the dispersant solution, and after stirring, ultrasonic dispersion treatment is performed. Then 5 parts of polyether sulfone, 8 parts of methyl methacrylate and 7 parts of an emulsifier are added, and emulsification and ultrasonic dispersion are performed under high-speed stirring at 1000 r / min to obtain a phase change microcapsule emulsion. Then drying is performed at a temperature of 80℃ for 12 hours to obtain phase change heat storage microcapsules; (3) 80 parts of base oil, 4 parts of sucrose fatty acid ester, 8 parts of glycerol, 5 parts of lubricant, 4 parts of anti-rust agent, 8 parts of penetrant, 5 parts of modified molybdenum disulfide and the phase change heat storage microcapsules prepared in step (2) are all mixed and stirred uniformly under the condition that the temperature is 70-90℃. The stirring speed is set to 4000 r / min. Then 2 parts of a pH adjuster is added, and after mixing uniformly, cooling is performed to room temperature to obtain a metal cutting fluid.

[0025] The cationic dispersant is set as dodecyl trimethyl ammonium bromide, the emulsifier is set as long-chain fatty alcohol polyoxyethylene propylene ether, the base oil is set as mineral base oil, the lubricant is set as polyoxyethylene alkyl acyl alcohol amine, the anti-rust agent is set as benzotriazole, and the pH regulator is set as isopropyl alcohol amine.

[0026] The preparation method of the penetrant is as follows: The acrylic copolymer emulsion, sodium 2-ethylhexyl sulfate, tannic acid and propylene glycol butyl ether are stirred under the condition of below 60℃ to obtain the penetrant. The mass ratio of the acrylic copolymer emulsion, sodium 2-ethylhexyl sulfate, tannic acid and propylene glycol butyl ether is 10:2:1:3.

[0027] The preparation method of the modified molybdenum disulfide is as follows: The nano molybdenum disulfide is placed in a heating furnace and calcined at 230℃ for 1 hour, then cooled to room temperature, and then placed in ethanol, followed by the addition of cetyl trimethyl ammonium bromide and polytetrafluoroethylene, stirred at 90°C for 12 hours, then placed, filtered, washed with deionized water, and dried to obtain the modified molybdenum disulfide.

[0028] The mass ratio of the nano molybdenum disulfide, ethanol, cetyl trimethyl ammonium bromide and polytetrafluoroethylene is 30:60:5:1. Embodiment

[0029] A preparation method of a metal cutting fluid, comprising the following steps: (1) 8 parts of nano graphite powder are dispersed in 10 parts of anhydrous ethanol and ultrasonically treated, then 2 parts of 3-aminopropyl trimethoxysilane is added for modification treatment, and then the supermolecular structure nano graphite powder is obtained after washing and drying, and the supermolecular structure nano graphite powder is mixed with 1 part of ammonium bicarbonate, and then ball milling is performed in liquid carbon dioxide by using a ball milling method to grind to a particle size of 0.2 mm to obtain modified supermolecular structure nano graphite powder; (2) 2 parts of a cationic dispersant is added to 10 parts of a trimethylol aminomethane hydrochloride solution, stirred uniformly to obtain a dispersant solution, then the modified supermolecular structure nano graphite powder prepared in step (1) is added to the dispersant solution, stirred and ultrasonically dispersed, then 3 parts of polyether sulfone, 4 parts of methyl methacrylate and 5 parts of an emulsifier are added, emulsified and ultrasonically dispersed at a high speed of 800 r / min to obtain a phase change microcapsule emulsion, and then dried at 70℃ for 6 hours to obtain phase change heat storage microcapsules. (3) under the condition of 70℃, mix 60 parts of base oil, 2 parts of sucrose fatty acid ester, 5 parts of glycerol, 3 parts of lubricant, 2 parts of anti-rust agent, 6 parts of penetrant, 3 parts of modified molybdenum disulfide and the phase change heat storage microcapsules prepared in step (2) uniformly, the stirring speed is set to 1800r / min, then add 1 part of pH adjuster, mix uniformly and cool to room temperature to obtain the metal cutting fluid.

[0030] The cationic dispersant is set as cetyltrimethylammonium chloride, the emulsifier is set as alkylphenol polyoxyethylene ether, the base oil is set as synthetic base oil, the lubricant is set as polyoxyethylene alkylacyl alcohol amine, the anti-rust agent is set as N, N'-methylene bis morpholine, and the pH adjuster is set as cyclohexylamine.

[0031] The preparation method of the penetrant is as follows: The acrylic acid copolymer emulsion, 2-ethylhexyl sodium sulfate, tannic acid and propylene glycol butyl ether are stirred under the condition of below 60℃ to obtain the penetrant. The mass ratio of the acrylic acid copolymer emulsion, 2-ethylhexyl sodium sulfate, tannic acid and propylene glycol butyl ether is 10:2:1:3.

[0032] The preparation method of the modified molybdenum disulfide is as follows: The nano molybdenum disulfide is placed in a heating furnace and calcined at 200℃ for 1 hour, then cooled to room temperature, then the nano molybdenum disulfide is placed in ethanol, then cetyltrimethylammonium bromide and polytetrafluoroethylene are added, stirred at 80°C for 10 hours, then placed, filtered, washed with deionized water, dried to obtain the modified molybdenum disulfide.

[0033] The mass ratio of the nano molybdenum disulfide, ethanol, cetyltrimethylammonium bromide and polytetrafluoroethylene is 30:60:5:1. Embodiment

[0034] A preparation method of a metal cutting fluid, comprising the following steps: (1) disperse 9 parts of nano graphite powder into 20 parts of anhydrous ethanol and perform ultrasonic treatment, then add 3 parts of 3-aminopropyltrimethoxysilane for modification treatment, then wash and dry to obtain supermolecular structure nano graphite powder, mix the supermolecular structure nano graphite powder with 2 parts of ammonium bicarbonate, then perform ball milling in liquid carbon dioxide by using a ball milling method, and mill to a particle size of 0.3mm to obtain modified supermolecular structure nano graphite powder; (2) 3 parts of cationic dispersant is added into 12 parts of trimethylol aminomethane hydrochloride solution, after stirring to be uniform, a dispersant solution is obtained, then the modified supramolecular structure nano graphite powder prepared in step (1) is added into the dispersant solution, after stirring, ultrasonic dispersion treatment is carried out, then 4 parts of polyether sulfone, 6 parts of methyl methacrylate and 6 parts of emulsifier are added, emulsification and ultrasonic dispersion are carried out under the condition of high speed stirring at 900 r / min, a phase change microcapsule emulsion is obtained, then drying is carried out under the condition of temperature of 78℃ for 10 hours, phase change heat storage microcapsules are obtained; (3) under the condition of temperature of 80℃, 70 parts of base oil, 3 parts of sucrose fatty acid ester, 6 parts of glycerol, 4 parts of lubricant, 3 parts of antirust agent, 7 parts of penetrant, 4 parts of modified molybdenum disulfide and the phase change heat storage microcapsules prepared in step (2) are all mixed and stirred uniformly, the stirring speed is set to 3000 r / min, then 3 parts of pH adjuster is added, after mixing uniformly, cooling to room temperature, metal cutting fluid is obtained.

[0035] The cationic dispersant is set to dodecyl trimethyl ammonium bromide, the emulsifier is set to long chain fatty alcohol polyoxyethylene propylene ether, the base oil is set to vegetable base oil, the lubricant is set to polyoxyethylene alkyl acyl alcohol amine, the antirust agent is set to benzotriazole, and the pH adjuster is set to fatty alcohol acyl.

[0036] The preparation method of the penetrant is as follows: The acrylic acid copolymer emulsion, 2-ethylhexyl sodium sulfate, tannic acid and propylene glycol butyl ether are stirred under the condition of temperature below 60℃ to obtain the penetrant. The mass ratio of the acrylic acid copolymer emulsion, 2-ethylhexyl sodium sulfate, tannic acid and propylene glycol butyl ether is 10:2:1:3.

[0037] The preparation method of the modified molybdenum disulfide is as follows: The nano molybdenum disulfide is placed into a heating furnace, calcination is carried out under the condition of temperature of 200℃ for 1.5 hours, then the temperature is reduced to room temperature, then the nano molybdenum disulfide is placed in ethanol, then cetyl trimethyl ammonium bromide and polytetrafluoroethylene are added, after stirring under the condition of temperature of 85℃ for 10 hours, standing, filtration, washing with deionized water, drying, the modified molybdenum disulfide is prepared.

[0038] The mass ratio of the nano molybdenum disulfide, ethanol, cetyl trimethyl ammonium bromide and polytetrafluoroethylene is 30:60:5:1.

[0039] Comparative example 1 At 70 DEG C, 60 parts of base oil, 5 parts of glycerol, 3 parts of lubricant, 2 parts of antirust agent, 6 parts of penetrant are mixed and stirred uniformly, the stirring speed is set at 1800r / min, then 1 part of pH regulator is added, mixed uniformly, and cooled to room temperature to obtain the metal cutting fluid.

[0040] Experimental test According to GB / T6144-2010 "synthetic cutting fluid", the performance test of corrosion resistance, lubricity and rust resistance is carried out, the cutting fluid temperature is increased from 40 DEG C to 80 DEG C, the heat absorption is measured, and the test results are shown in table 1.

[0041]

[0042] From the above results, it can be seen that the present application has good lubricity, rust resistance, corrosion resistance and stability, and good cooling effect.

[0043] The above examples are the preferred embodiments of the present application, but the embodiments of the present application are not limited by the above examples, any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application are equivalent replacement methods, and are all included in the protection scope of the present application.

Claims

1. A method for preparing a metal cutting fluid, characterized in that, Includes the following steps: (1) Disperse 8-10 parts of nano-graphite powder into 10-30 parts of anhydrous ethanol and sonicate it. Then add 2-4 parts of 3-aminopropyltrimethoxysilane for modification. After washing and drying, obtain supramolecular nano-graphite powder. Mix supramolecular nano-graphite powder with 1-3 parts of ammonium bicarbonate and then ball mill it in liquid carbon dioxide to grind it to a particle size of 0.1-0.4 mm to obtain modified supramolecular nano-graphite powder. (2) Add 2-4 parts of cationic dispersant to 10-15 parts of tris(hydroxymethyl)aminomethane hydrochloride solution, stir evenly to obtain dispersant solution, then add all the modified supramolecular structure nano-graphite powder obtained in step (1) to dispersant solution, stir and then perform ultrasonic dispersion treatment, then add 3-5 parts of polyethersulfone, 4-8 parts of methyl methacrylate and 5-7 parts of emulsifier, emulsify and ultrasonically disperse under high speed stirring at 800-1000r / min to obtain phase change microcapsule emulsion, then dry at 70-80℃ for 6-12 hours to obtain phase change heat storage microcapsules; (3) At a temperature of 70-90℃, 60-80 parts of base oil, 2-4 parts of sucrose fatty acid ester, 5-8 parts of glycerin, 3-5 parts of lubricant, 2-4 parts of rust inhibitor, 6-8 parts of penetrant, 3-5 parts of modified molybdenum disulfide and the phase change heat storage microcapsules prepared in step (2) are mixed and stirred evenly. The stirring speed is set to 1800-4000 r / min. Then, 1-5 parts of pH adjuster are added, mixed evenly and cooled to room temperature to obtain metal cutting fluid.

2. The method for preparing metal cutting fluid according to claim 1, characterized in that, The cationic dispersant is set as dodecyltrimethylammonium bromide or hexadecyltrimethylammonium chloride.

3. The method for preparing metal cutting fluid according to claim 1, characterized in that, The emulsifier is configured as long-chain fatty alcohol polyoxyethylene propylene ether or alkylphenol polyoxyethylene ether.

4. The method for preparing metal cutting fluid according to claim 1, characterized in that, The base oil is selected from at least one of mineral base oil, synthetic base oil, or vegetable base oil.

5. The method for preparing metal cutting fluid according to claim 1, characterized in that, The lubricant is a polyoxyethylene alkyl amide.

6. The method for preparing metal cutting fluid according to claim 1, characterized in that, The rust inhibitor is set as benzotriazole or N,N'-methylenebismorpholine.

7. The method for preparing metal cutting fluid according to claim 1, characterized in that, The preparation method of the penetrant is as follows: The penetrant was obtained by stirring an acrylic copolymer emulsion, sodium 2-ethylhexyl sulfate, tannic acid, and propylene glycol butyl ether at a temperature below 60°C. The mass ratio of the acrylic copolymer emulsion, sodium 2-ethylhexyl sulfate, tannic acid, and propylene glycol butyl ether is 10:2:1:

3.

8. The method for preparing metal cutting fluid according to claim 1, characterized in that, The modified molybdenum disulfide is prepared as follows: Nano-molybdenum disulfide was placed in a heating furnace and calcined at 200-230°C for 1-2 hours, then cooled to room temperature. The nano-molybdenum disulfide was then placed in ethanol, followed by the addition of hexadecyltrimethylammonium bromide and polytetrafluoroethylene (PTFE). The mixture was stirred at 80-90°C for 10-12 hours, allowed to stand, filtered, washed with deionized water, and dried to obtain modified molybdenum disulfide. The mass ratio of nano-molybdenum disulfide, ethanol, hexadecyltrimethylammonium bromide, and PTFE was 30:60:5:

1.

9. The method for preparing metal cutting fluid according to claim 1, characterized in that, The pH adjuster is set to at least one of isopropanolamine, cyclohexylamine, or fatty alcohol acyl.

10. A metal cutting fluid, characterized in that, It is prepared using the metal cutting fluid preparation method according to any one of claims 1-9.

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