Preparation method of nanometer phase change capsule fluid for minimum quantity lubrication processing

Abstract

The invention relates to a preparation method of a nano phase change capsule fluid for minimal quantity lubrication processing. The preparation method comprises the following steps: 1) selecting a liquid phase enhancer and a nano phase change capsule core material; 2) selecting a nano phase change capsule shell material, and treating the nano phase change capsule shell material and the nano phase change capsule core material by an in-situ polymerization method to prepare a nano phase change capsule; 3) taking properties of the liquid phase enhancer and the nano phase change capsule shell material into consideration, and selecting basic lubricating oil and a surfactant; and 4) determining the mass ratio of the nano phase change capsule, the liquid phase enhancer, the base lubricating oil and the surfactant, and preparing nano phase change capsule fluid. The prepared nanometer phase change capsule fluid can be used for minimal quantity lubrication in the cutting process of materials difficult to machine. The preparation method is convenient to implement, and the cooling and lubricating effects are obvious in the machining process.

Description

Technical Field

[0001] This invention relates to the field of clean cutting technology, and more specifically to a method for preparing nano-phase change capsule fluid for micro-lubrication processing. Background Technology

[0002] The energy, power, and life sciences sectors widely utilize components made from difficult-to-machine materials. These materials exhibit high hardness and strength, resulting in high cutting forces and temperatures during machining, leading to easy tool wear and difficulty in controlling surface quality. For precision machining of these difficult-to-machine materials, conventional micro-lubrication methods suffer from insufficient lubrication flow, resulting in inadequate cooling and lubrication, and easily causing surface quality defects. Therefore, researching a method for preparing nano-phase change capsule fluids for micro-lubrication machining is of great significance for reducing friction and heat dissipation during the machining process, achieving high-quality machining of difficult-to-machine materials, and promoting the development of high-end equipment manufacturing in the energy, power, and life sciences sectors.

[0003] Nanoparticles have a large specific surface area and good thermal conductivity, thus nanofluid cutting fluids exhibit better heat exchange performance. Some existing technologies have innovated formulations and preparation processes to prepare graphene-based nanofluid cutting fluids using a small amount of organic dispersant, graphene, and a large amount of water. However, cutting fluids prepared by this method still cannot meet the heat dissipation requirements of some difficult-to-machine materials. Some existing technologies use carbon nanotube (CNT) microcapsules (CNTs@T321) filled with sulfurized isobutylene (T321) as additives to prepare nanofluid grinding fluids. The nanocapsules release lubricant into the grinding area, providing self-lubrication and reducing the force and temperature during machining from a lubrication perspective. However, the large amount of broken carbon nanotubes remaining will damage the surface morphology of the machined material. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing nano-phase change capsule fluid for micro-lubrication processing, comprising the following steps:

[0005] 1) Select liquid phase enhancer and nano-phase change capsule core material.

[0006] 2) Select nano-phase change capsule shell materials and process the nano-phase change capsule shell materials and nano-phase change capsule core materials by in-situ polymerization to prepare nano-phase change capsules.

[0007] 3) Consider the properties of the liquid phase enhancer and the nano-phase change capsule shell material, and select the base lubricant and surfactant.

[0008] 4) Determine the mass ratio of nanophase change capsules, liquid phase enhancer, base lubricant and surfactant according to the properties of the required nanophase change capsule fluid, and prepare the nanophase change capsule fluid.

[0009] Furthermore, the step of selecting the liquid phase enhancer and the nano-phase change capsule core material is as follows:

[0010] 1.1) Establish a finite element model of workpiece cutting based on the material properties of the workpiece and the tool, and simulate the cutting temperature.

[0011] 1.2) Three types of solvents with boiling points equal to the cutting temperature were selected as liquid phase reinforcing agents.

[0012] 1.3) Select phase change materials with melting points equal to cutting temperatures as the core materials for nanophase change capsules.

[0013] Furthermore, the liquid phase enhancer includes ethylene glycol carbonate.

[0014] Furthermore, the core material of the nanophase change capsule includes paraffin.

[0015] Furthermore, the nano-phase change capsule shell material includes graphene oxide.

[0016] Furthermore, in step 2), the steps for preparing the nano-phase change capsules are as follows:

[0017] 2.1) Mix the nano-phase change capsule shell material with deionized water and heat it to a preset temperature I.

[0018] 2.2) Use ultrasound to process the heated mixture.

[0019] 2.3) Add a dispersion to the ultrasonically treated liquid and adjust the pH value of the ultrasonically treated liquid. At a preset temperature I, a shell prepolymer is obtained.

[0020] The dispersion includes a silane coupling agent.

[0021] 2.4) The core material of the nano-phase change capsule is mixed with deionized water and stirred at a preset temperature II to prepare the core material emulsion.

[0022] The preset temperature I is less than the preset temperature II.

[0023] 2.5) The shell prepolymer is dropped into the core material emulsion and stirred to obtain the reaction product.

[0024] 2.6) After filtering and washing the reaction product, it was dried to obtain nano-phase change capsules.

[0025] Furthermore, the base lubricant includes pentaerythritol tetraoleate.

[0026] The surfactant includes fluorocarbon-modified polyoxyethylene ether.

[0027] Furthermore, the properties of the required nanophase change capsule fluid include the dispersion stability of the nanophase change capsules and the fluid viscosity.

[0028] Furthermore, during the preparation of the nano-phase change capsule fluid, the liquid phase enhancer and surfactant are compounded to form a microemulsion.

[0029] Furthermore, ultrasonic dispersion of the nanophase change capsule fluid is employed during the preparation of the fluid to ensure its stability.

[0030] The technical effects of this invention are undeniable. This invention analyzes the cutting temperature of difficult-to-machine materials by establishing a finite element model, selects a liquid phase reinforcing agent with high specific heat capacity and a nano-phase change capsule core material, and uses a material with high thermal conductivity as the capsule shell material. Then, nano-phase change capsules are prepared by in-situ polymerization. Considering the polarity of the capsule shell material and the liquid phase reinforcing agent, a base lubricant and activator are selected, and the appropriate mass ratio of each component in the nano-phase change capsule fluid for micro-lubrication is determined, thus preparing the nano-phase change capsule fluid. Finally, the cooling and lubrication effect of the nano-phase change capsule fluid in the micro-lubrication process of difficult-to-machine materials is analyzed using finite element analysis. The prepared nano-phase change capsule fluid can be used for micro-lubrication in the cutting process of difficult-to-machine materials. This method is convenient to implement, and the cooling and lubrication effect during the machining process is significant. Attached Figure Description

[0031] Figure 1 Flowchart for the preparation of nano-phase change capsule fluid for micro-lubrication processing;

[0032] Figure 2 Scanning electron microscope image of nano-phase change capsules;

[0033] Figure 3 Finite element analysis diagram for cutting difficult-to-machine materials using nano-phase change capsule fluid micro-lubrication. Detailed Implementation

[0034] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0035] Example 1:

[0036] See Figures 1 to 3 A method for preparing nano-phase change capsule fluid for micro-lubrication processing includes the following steps:

[0037] 1) Select liquid phase enhancer and nano-phase change capsule core material.

[0038] 2) Select nano-phase change capsule shell materials and process the nano-phase change capsule shell materials and nano-phase change capsule core materials by in-situ polymerization to prepare nano-phase change capsules.

[0039] 3) Consider the properties of the liquid phase enhancer and the nano-phase change capsule shell material, and select the base lubricant and surfactant.

[0040] 4) Determine the mass ratio of nanophase change capsules, liquid phase enhancer, base lubricant and surfactant according to the properties of the required nanophase change capsule fluid, and prepare the nanophase change capsule fluid.

[0041] Example 2:

[0042] A method for preparing nano-phase change capsule fluid for micro-lubrication processing is described in Example 1. Further, the steps for selecting the liquid phase enhancer and the nano-phase change capsule core material are as follows:

[0043] 1.1) Establish a finite element model of workpiece cutting based on the material properties of the workpiece and the tool, and simulate the cutting temperature.

[0044] 1.2) Three types of solvents with boiling points equal to the cutting temperature were selected as liquid phase reinforcing agents.

[0045] 1.3) Select phase change materials with melting points equal to cutting temperatures as the core materials for nanophase change capsules.

[0046] Example 3:

[0047] A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which are described in any one of Examples 1 to 2, further wherein the liquid phase enhancer includes ethylene glycol carbonate.

[0048] Example 4:

[0049] A method for preparing a nano-phase change capsule fluid for micro-lubrication processing is described in any one of Examples 1 to 3. Further, the core material of the nano-phase change capsule includes paraffin.

[0050] Example 5:

[0051] A method for preparing a nano-phase change capsule fluid for micro-lubrication processing is provided, the main technical contents of which are described in any one of Examples 1 to 4. Further, the nano-phase change capsule shell material includes graphene oxide.

[0052] Example 6:

[0053] A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which are described in any one of Examples 1 to 5, further comprising the following steps in step 2):

[0054] 2.1) Mix the nano-phase change capsule shell material with deionized water and heat it to a preset temperature I.

[0055] 2.2) Use ultrasound to process the heated mixture.

[0056] 2.3) Add a dispersion to the ultrasonically treated liquid and adjust the pH value of the ultrasonically treated liquid. At a preset temperature I, a shell prepolymer is obtained.

[0057] The dispersion includes a silane coupling agent.

[0058] 2.4) The core material of the nano-phase change capsule is mixed with deionized water and stirred at a preset temperature II to prepare the core material emulsion.

[0059] The preset temperature I is less than the preset temperature II.

[0060] 2.5) The shell prepolymer is dropped into the core material emulsion and stirred to obtain the reaction product.

[0061] 2.6) After filtering and washing the reaction product, it was dried to obtain nano-phase change capsules.

[0062] Example 7:

[0063] A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which are described in any one of Examples 1 to 6, further wherein the base lubricating oil includes pentaerythritol tetraoleate.

[0064] The surfactant includes fluorocarbon-modified polyoxyethylene ether.

[0065] Example 8:

[0066] A method for preparing nanophase change capsule fluid for micro-lubrication processing, the main technical contents of which are described in any one of Examples 1 to 7. Further, the properties of the nanophase change capsule fluid to be prepared include the dispersion stability of the nanophase change capsules and the fluid viscosity.

[0067] Example 9:

[0068] A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which are described in any one of Examples 1 to 8, further wherein, in the process of preparing nano-phase change capsule fluid, a liquid phase enhancer and a surfactant are compounded to form a microemulsion.

[0069] Example 10:

[0070] A method for preparing nanophase change capsule fluid for micro-lubrication processing is provided. The main technical contents are described in any one of Examples 1 to 9. Furthermore, in the process of preparing nanophase change capsule fluid, ultrasonic dispersion is used to ensure the stability of nanophase change capsule fluid.

[0071] Example 11:

[0072] See Figures 1 to 3A method for preparing nano-phase change capsule fluid for micro-lubrication processing includes the following steps:

[0073] 1) Select liquid phase enhancer and nano-phase change capsule core material.

[0074] 2) Select a nano-phase change capsule shell material with high thermal conductivity, and process the nano-phase change capsule shell material and nano-phase change capsule core material by in-situ polymerization to prepare nano-phase change capsules.

[0075] 3) Consider the properties of the liquid phase enhancer and the nano-phase change capsule shell material, and select the base lubricant and surfactant.

[0076] 4) Determine the mass ratio of nanophase change capsules, liquid phase enhancer, base lubricant and surfactant according to the properties of the required nanophase change capsule fluid, and prepare the nanophase change capsule fluid.

[0077] Example 12:

[0078] A method for preparing nano-phase change capsule fluid for micro-lubrication processing is described in Example 11. Further, the steps for selecting the liquid phase enhancer and the nano-phase change capsule core material are as follows:

[0079] 1.1) Establish a finite element model of workpiece cutting based on the material properties of the workpiece and the tool, set the tool geometry and cutting motion parameters, and simulate the cutting force and cutting temperature during the machining process of difficult-to-machine materials.

[0080] The cutting temperature was obtained through finite element model simulation.

[0081] 1.2) Select three types of solvents with high specific heat capacity and boiling point at the cutting temperature as liquid phase reinforcing agents from the three types of solvents specified by the International Coordination Conference.

[0082] 1.3) Select a high specific heat capacity phase change material with a melting point equal to the cutting temperature as the core material for nano-phase change capsules.

[0083] Example 13:

[0084] A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which are described in any one of Examples 11 to 12, further wherein the liquid phase enhancer includes ethylene glycol carbonate.

[0085] Example 14:

[0086] A method for preparing a nano-phase change capsule fluid for micro-lubrication processing is provided, the main technical contents of which are described in any one of Examples 11 to 13. Further, the core material of the nano-phase change capsule includes paraffin.

[0087] Example 15:

[0088] A method for preparing a nano-phase change capsule fluid for micro-lubrication processing is provided. The main technical contents are described in any one of Examples 11 to 14. Furthermore, in order to ensure the strength of the nano-phase change capsule, the shell material of the nano-phase change capsule includes graphene oxide with high thermal conductivity.

[0089] Example 16:

[0090] A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which are described in any one of Examples 11 to 15, further comprising the following steps in step 2) for preparing nano-phase change capsules:

[0091] 2.1) Mix the nano-phase change capsule shell material with deionized water and heat to 70°C.

[0092] 2.2) Use ultrasound to process the heated mixture.

[0093] 2.3) Add a dispersion to the ultrasonically treated liquid and adjust the pH value of the ultrasonically treated liquid. At 70°C, a shell prepolymer is obtained.

[0094] The dispersion includes a silane coupling agent.

[0095] 2.4) The core material of the nano-phase change capsule was mixed with deionized water and stirred at high speed at 100°C to prepare the core material emulsion.

[0096] 2.5) The shell prepolymer is dropped into the core material emulsion and stirred continuously to obtain the reaction product.

[0097] 2.6) After filtering and washing the reaction product, it was dried to obtain nano-phase change capsules.

[0098] Example 17:

[0099] A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which are described in any one of Examples 11 to 16, further wherein the base lubricating oil includes pentaerythritol tetraoleate.

[0100] The surfactant includes fluorocarbon-modified polyoxyethylene ether.

[0101] Example 18:

[0102] A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which are described in any one of Examples 11 to 17. Further, the properties of the nano-phase change capsule fluid to be prepared include the dispersion stability of the nano-phase change capsules and the fluid viscosity.

[0103] Example 19:

[0104] A method for preparing nanophase change capsule fluid for micro-lubrication processing is provided. The main technical contents are described in any one of Examples 11 to 18. Further, in the process of preparing nanophase change capsule fluid, liquid phase enhancer and surfactant are compounded to form microemulsion, which serves as the main liquid component of nanophase change capsule fluid.

[0105] The liquid phase enhancer contained in the nanocapsule fluid is easily evaporated at cutting temperature, which can enhance the cooling effect of the lubricant.

[0106] Example 20:

[0107] A method for preparing nanophase change capsule fluid for micro-lubrication processing is provided. The main technical contents are described in any one of Examples 11 to 19. Furthermore, in the process of preparing nanophase change capsule fluid, ultrasonic dispersion is used to ensure the stability of nanophase change capsule fluid.

[0108] Example 21:

[0109] See Figures 1 to 3 A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which include:

[0110] This method addresses the problem of insufficient cooling and lubrication during the machining of difficult-to-machine materials. First, based on the temperature of the machining zone simulated by finite element analysis, a liquid phase enhancer and a nano-phase change capsule core material are selected, along with a shell material with high thermal conductivity. Nano-phase change capsules are prepared using an in-situ polymerization method. Second, considering the properties of the liquid phase enhancer and the nano-phase change capsule shell material, a base lubricant is selected, and a suitable surfactant is matched to formulate the nano-phase change capsule fluid. Then, ultrasonic dispersion of the nano-phase change capsules is used to ensure the stability of the nano-phase change capsule fluid. Computational fluid dynamics and finite element analysis are then used to analyze the improvement effect of the nano-phase change capsule fluid on the cooling and lubrication of the machining process. The specific steps of the method are as follows:

[0111] Step 1: Selection of Liquid Phase Enhancers and Nanophase Change Capsule Materials

[0112] A finite element model of workpiece cutting was established based on the material properties of the workpiece and the cutting tool. The tool geometry and cutting motion parameters were set to simulate the cutting force and temperature during the machining process of difficult-to-machine materials. Considering the cutting temperature, three solvents with high specific heat capacity and boiling points matching the cutting temperature were selected from the three categories specified by the International Harmonisation Conference as liquid phase reinforcing agents. A phase change material with high specific heat capacity and melting point matching the cutting temperature was selected as the capsule core material. To ensure the strength of the nano-phase change capsules, graphene oxide with high thermal conductivity was selected as the shell material.

[0113] Step 2: Preparation of Nanophase Change Capsules and Fluid Formulation of Nanocapsules

[0114] Graphene oxide was mixed with deionized water and heated to 70°C. The graphene oxide dispersion was treated with ultrasound, and then the dispersion was added back in to adjust the pH. The reaction solution was then reacted at 70°C to obtain a shell prepolymer. Deionized water was added to a three-necked flask, followed by the addition of the capsule core material. The mixture was stirred at high speed at 100°C to prepare a core material emulsion. The shell prepolymer was then added dropwise to the core material emulsion, stirred, and finally the reaction product was filtered, washed, and dried to obtain nano-phase change capsules.

[0115] Considering the polarity of the liquid phase enhancer and the properties of the shell material, non-polar esters that are liquid at room temperature were selected as the base lubricant. A stable microemulsion needs to be formed by compounding the liquid phase enhancer with an activator. The dispersion stability and fluid viscosity of the nano-phase change capsules were improved through testing, and the appropriate mass ratio of each component in the nano-phase change capsule fluid was determined to formulate the nano-capsule fluid. Ultrasonic dispersion of the nano-phase change capsules ensured the stability of the nano-phase change capsule fluid. The liquid phase enhancer contained in the nano-capsule fluid easily evaporates at cutting temperatures, which can enhance the lubricant's cooling effect. The "bearing-like" effect of the nano-phase change capsules and the endothermic phase change of the core material can improve the friction reduction and heat dissipation efficiency in the micro-lubrication milling area.

[0116] Step 3: Finite element analysis of cutting difficult-to-machine materials using nano-phase change capsule fluid micro-lubrication.

[0117] By combining a finite element model for cutting difficult-to-machine materials, cutting data is transferred to computational fluid dynamics (CFD) analysis. Physical parameters such as the density of the micro-lubricant, as well as atomization parameters such as average droplet size and flow rate, are set. Considering friction and evaporation effects, the heat transfer coefficient and friction coefficient correction values ​​calculated by CFD analysis are fed back to the cutting finite element model. The synergistic effect of nano-phase change capsule fluid on improving the cooling and lubrication performance of micro-lubricants is analyzed.

[0118] Example 22:

[0119] See Figures 1 to 3 A method for preparing nano-phase change capsule fluid for micro-lubrication processing, the main technical contents of which include:

[0120] The machining of difficult-to-machine material parts involves high cutting forces and temperatures. Conventional micro-lubrication methods often fail to provide sufficient cooling and lubrication, hindering the improvement of machining quality for high-end equipment. To enhance the cooling and lubrication effects of micro-lubrication during machining, a method for preparing nano-phase change capsule fluid for micro-lubrication machining has been invented. The overall process is shown in the attached figure. Figure 1 As shown.

[0121] Step 1: Based on the material properties of cobalt-based alloy workpieces and cemented carbide cutting tools, a finite element model for cobalt-based alloy cutting was established using ABAQUS software. The tool rake angle was 0 degrees, clearance angle was 15 degrees, depth of cut was set to 1 mm, and cutting speed was 50 m / min. The finite element simulation of the cutting force and temperature of the cobalt-based alloy was performed, with a cutting force of approximately 100 N and a cutting temperature of approximately 240 °C. Considering the cutting temperature, ethylene glycol carbonate, a high specific heat capacity solvent with a boiling point approximately equal to the cutting temperature, was selected from the three solvents specified by the International Harmonization Conference as a liquid phase reinforcing agent. High-melting-point paraffin wax was selected as the core material for the capsule. To ensure the strength of the nano-phase change capsule, graphene oxide with high thermal conductivity was selected as the shell material.

[0122] Step 2: Graphene oxide was mixed with deionized water and heated to 70°C. The graphene oxide dispersion was treated with ultrasound for 20 minutes, then the dispersion was added, and the pH was adjusted. The reaction solution was reacted at 70°C for 3 hours to obtain the shell prepolymer. Deionized water was added to a three-necked flask, followed by the addition of high-temperature paraffin wax, the core material for the capsule. The mixture was stirred at high speed at 100°C to prepare the core material emulsion. The shell prepolymer was added dropwise to the core material emulsion and stirred for 2 hours. Finally, the reaction product was filtered, washed, and dried to obtain the nano-phase change capsules. A scanning electron microscope image of the capsules is attached. Figure 2 As shown.

[0123] Considering the polarity of the liquid phase reinforcing agent and the properties of the shell material, pentaerythritol tetraoleate, which is liquid at room temperature, was selected as the base lubricant. A stable microemulsion was formed by compounding the liquid phase reinforcing agent with the activator fluorocarbon-modified polyoxyethylene ether FC-4430. The dispersion stability and fluid viscosity of the nano-phase change capsules were improved through testing, and the appropriate mass ratio of each component in the nano-phase change capsule fluid was determined to prepare the fluid. The nano-phase change capsule fluid was ultrasonically dispersed for 30 minutes to ensure its stability.

[0124] Step 3: Using the cobalt-based alloy cutting finite element model, the cutting data is transferred to the computational fluid dynamics (CFD) analysis software. The density of the micro-lubricant, as well as the average droplet size and flow rate, are set. Considering friction and evaporation effects, the heat transfer coefficient and friction coefficient correction values ​​calculated by the CFD analysis are fed back to the cutting finite element model. The cobalt-based alloy micro-lubrication cutting temperature analysis is shown in the attached figure. Figure 3 As shown, the temperature is significantly lower compared to direct cutting.

[0125] The method for preparing nano-phase change capsule fluid for micro-lubrication machining according to the present invention can reduce friction and dissipate heat during micro-lubrication cutting of cobalt-based alloys. The method is convenient to implement and can be applied to micro-lubrication machining of difficult-to-machine material parts in the fields of energy, power and life health.

Claims

1. A method for preparing a nanophase transformation capsule fluid for micro lubrication machining, characterized by, The method comprises the following steps: 1) selecting a liquid phase enhancer and a nano-phase change capsule core material; 2) selecting a nano-phase change capsule shell material, and processing the nano-phase change capsule shell material and the nano-phase change capsule core material by an in-situ polymerization method to prepare a nano-phase change capsule; 3) considering the properties of the liquid phase enhancer and the nano-phase change capsule shell material, selecting a base lubricating oil and a surfactant; 4) determining the mass ratio of the nano-phase change capsule, the liquid phase enhancer, the base lubricating oil and the surfactant according to the properties of the nano-phase change capsule fluid to be prepared, and preparing the nano-phase change capsule fluid.

2. The method for preparing nanophase-change capsule fluid for micro lubrication machining according to claim 1, characterized in that, The step of selecting the liquid phase enhancer and the nano-phase change capsule core material is as follows: 1.1) establishing a workpiece cutting finite element model according to the properties of the workpiece material and the tool material, and simulating to obtain a cutting temperature; 1.2) selecting three types of solvents with a boiling point equal to the cutting temperature as the liquid phase enhancer; 1.3) selecting a phase change material with a melting point equal to the cutting temperature as the nano-phase change capsule core material.

3. The method for preparing nano-phase change capsule fluid for micro-lubrication processing according to claim 2, characterized in that, The liquid phase enhancer comprises ethylene glycol carbonate.

4. The method for preparing nano-phase change capsule fluid for micro-lubrication processing according to claim 2, characterized in that, The nano-phase change capsule core material comprises paraffin.

5. The method for preparing nano-phase change capsule fluid for micro-lubrication processing according to claim 1, characterized in that, The nano-phase change capsule shell material comprises graphene oxide.

6. The method for preparing nano-phase change capsule fluid for micro-lubrication processing according to claim 1, characterized in that, In step 2), the step of preparing the nano-phase change capsule is as follows: 2.1) mixing the nano-phase change capsule shell material with deionized water, and heating to a preset temperature I; 2.2) processing the heated mixed liquid by ultrasonic waves; 2.3) adding a dispersion liquid to the liquid processed by ultrasonic waves, and adjusting the pH value of the liquid processed by ultrasonic waves, to prepare a shell pre-polymer at the preset temperature I; The dispersion liquid comprises a silane coupling agent; 2.4) mixing the nano-phase change capsule core material with deionized water, and stirring at a preset temperature II to prepare a core material emulsion; The preset temperature I is less than the preset temperature II; 2.5) dropping the shell pre-polymer into the core material emulsion, and stirring to obtain a reaction product; 2.6) filtering and washing the reaction product, and drying to obtain the nano-phase change capsule.

7. The method for preparing nano-phase change capsule fluid for micro-lubrication processing according to claim 1, characterized in that, The base lubricating oil comprises pentaerythritol tetraoleate; The surfactant comprises a fluorocarbon modified polyoxyethylene ether.

8. The method for preparing nano-phase change capsule fluid for micro-lubrication processing according to claim 1, characterized in that, The properties of the nano-phase change capsule fluid to be prepared include nano-phase change capsule dispersion stability and fluid viscosity.

9. The method for preparing nano-phase change capsule fluid for micro-lubrication processing according to claim 1, characterized in that, In the process of preparing the nano-phase change capsule fluid, the liquid phase enhancer and the surfactant are compounded to form a microemulsion.

10. The method for preparing nano-phase change capsule fluid for micro-lubrication processing according to claim 1, characterized in that, In the process of preparing the nano-phase change capsule fluid, ultrasonic waves are used to disperse the nano-phase change capsule fluid to ensure the stability of the nano-phase change capsule fluid.

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