A fully synthetic grinding fluid with cooling and rust prevention functions and a preparation method thereof

Abstract

The application relates to the technical field of full-synthetic grinding fluid, and particularly discloses a full-synthetic grinding fluid with cooling and rust-proof functions and a preparation method thereof. The full-synthetic grinding fluid with cooling and rust-proof functions is prepared from raw materials containing the following components in parts by weight: water 60-85 parts, lubricant 5-15 parts, extreme pressure agent 1-5 parts, surfactant 1-3 parts, defoaming agent 0.1-0.5 parts, preservative 0.1-0.3 parts and microcapsule rust-proof agent 3-8 parts. The preparation method comprises the following steps: uniformly mixing water, the extreme pressure agent, the surfactant, the preservative and the microcapsule rust-proof agent after heating, then adding the lubricant and the defoaming agent, and stirring at normal temperature to obtain the full-synthetic grinding fluid with cooling and rust-proof functions. The application further improves the rust-proof effect under the premise of guaranteeing that the full-synthetic grinding fluid has excellent cooling performance, thereby better protecting workpieces.

Description

Technical Field

[0001] This application relates to the field of fully synthetic grinding fluid technology, and more specifically, to a fully synthetic grinding fluid that combines cooling and rust prevention functions and its preparation method. Background Technology

[0002] Grinding fluid is a crucial component in grinding processes, used for lubrication, cooling, cleaning, and rust prevention. It is an industrial liquid used in metal grinding machines to cool and lubricate the grinding wheel and the workpiece. During grinding, a large amount of heat is generated between the grinding wheel and the workpiece. Excessive temperature in the grinding zone can lead to workpiece deformation, burning, and grinding wheel wear. Grinding fluid effectively reduces the temperature by carrying away heat, thereby improving the workpiece's machining quality, extending the equipment's service life, and reducing grinding wheel wear.

[0003] Grinding fluids are mainly divided into two types: water-soluble grinding fluids and oil-soluble grinding fluids. Water-soluble grinding fluids are further subdivided into emulsions, semi-synthetic fluids, and fully synthetic fluids. Fully synthetic grinding fluids are water-based grinding fluids composed of cleaning agents, penetrants, extreme pressure agents, lubricants, rust inhibitors, etc. They have the characteristics of good extreme pressure properties, excellent cooling and cleaning properties, and do not contain harmful substances such as mineral oil, nitrites, and phenols, thus meeting the requirements of green manufacturing.

[0004] The main function of rust inhibitors used in fully synthetic grinding fluids is to protect workpieces from corrosion and rust during machining and subsequent processes. Rust inhibitors typically include inorganic rust inhibitors such as nitrites, boric acid, benzoates, molybdates, tungstates, and phosphates, as well as organic rust inhibitors such as borate esters, alkanolamines, and amino acid esters. Organic rust inhibitors, in particular, are more environmentally friendly, safer for operators, and require less wastewater treatment. Furthermore, most organic rust inhibitors are biodegradable, making them environmentally friendly and preventing the accumulation of heavy metals or harmful substances with long-term use; therefore, they are widely used.

[0005] Regarding the aforementioned technologies, the inventors believe that, due to the influence of application scenarios, the rust inhibitors in fully synthetic grinding fluids need to withstand the effects of temperature rise and high temperatures, which makes it difficult for them to fully exert their rust-preventive effect in actual operation. If the rust-preventive performance is improved by increasing the amount of organic rust inhibitors added, the heat transfer efficiency of the grinding fluid will be reduced, and the overall cooling effect will be compromised.

[0006] Therefore, there is an urgent need to propose a solution to address the aforementioned technical problems. Summary of the Invention

[0007] In order to further improve the rust prevention effect and thus better protect the workpiece while ensuring that the fully synthetic grinding fluid has excellent cooling performance, this application provides a fully synthetic grinding fluid with both cooling and rust prevention functions and its preparation method.

[0008] In a first aspect, this application provides a fully synthetic grinding fluid that combines cooling and rust prevention functions, employing the following technical solution: A fully synthetic grinding fluid with both cooling and rust-preventing functions is made from raw materials comprising the following parts by weight: 60-85 parts water; 5-15 parts lubricant; Extreme pressure agent 1-5 parts; 1-3 parts surfactant; 0.1-0.5 parts of defoamer; Preservative: 0.1-0.3 parts; 3-8 parts of microcapsule rust inhibitor; The microcapsule rust inhibitor was prepared by the following method: S1. Dissolve the wall material monomer in an organic solvent and add an emulsifier to mix, thus obtaining a wall material solution; simultaneously, mix the protective colloid and water, heat and stir to obtain an aqueous solution; S2. Take the organic rust inhibitor raw material as the core material and add it to the wall material solution obtained in step S1. After stirring and dispersing, add it dropwise to the aqueous phase solution obtained in step S1. During the process, high-speed shearing is carried out to obtain a mixed emulsion. S3. Add an initiator to the mixed emulsion obtained in step S2, heat the mixture and stir during the reaction. After the reaction is complete, cool the mixture and add a demulsifier for sedimentation. Finally, centrifuge, wash, dry and sieve the mixture to obtain the microcapsule rust inhibitor.

[0009] By adopting the above technical solution, water serves as the main component of the fully synthetic grinding fluid, providing excellent thermal conductivity to quickly remove grinding heat. Simultaneously, it acts as a dispersion medium for other components, forming a homogeneous and stable water-based system. The lubricant forms a lubricating film at the interface between the grinding wheel and the workpiece, reducing the coefficient of friction, lowering grinding force and temperature, and preventing workpiece burns and grinding wheel wear. The extreme pressure agent, under the high temperature and pressure conditions of grinding, reacts chemically with the metal surface to generate a high-melting-point extreme pressure film, preventing direct metal-to-metal contact and avoiding workpiece burns and grinding wheel adhesion. The surfactant reduces the surface tension of the liquid, enhances wetting and penetration into the workpiece and grinding wheel, and helps the grinding fluid quickly enter the grinding zone; it also promotes the uniform dispersion of components such as microencapsulated rust inhibitors and lubricants, preventing sedimentation and stratification. The defoamer inhibits and eliminates foam generated during grinding, ensuring machining visibility and preventing foam from affecting cooling and lubrication performance. Preservatives prevent the growth of bacteria and mold in grinding fluid during storage and use, extending the service life of the working fluid and avoiding performance degradation and odor caused by microbial spoilage. Microencapsulated rust inhibitors, through microencapsulation technology, exist as solid particles at room temperature without premature release; when the temperature in the grinding zone rises or is subjected to mechanical shearing, the wall material ruptures, releasing the organic rust inhibitor, achieving "on-demand release." This ensures high-temperature rust prevention while avoiding negative impacts on cooling performance.

[0010] In the preparation of microcapsule rust inhibitors, a stable oil-phase and aqueous-phase system is first established in step S1 to provide a foundation for subsequent interfacial polymerization or in-situ polymerization reactions. Then, in step S2, the core material (organic rust inhibitor) is encapsulated in oil-phase droplets and dispersed in the aqueous phase to form a stable emulsion system. Finally, in step S3, the wall material is polymerized and cured to form a complete microcapsule structure, and a pure, uniformly sized finished product is obtained through post-processing. This achieves effective encapsulation of the organic rust inhibitor. The application of this specially prepared microcapsule rust inhibitor in fully synthetic grinding fluids significantly improves the rust prevention effect while ensuring cooling performance, thus better protecting the workpiece. Simultaneously, the microcapsule rust inhibitor exists as solid particles at room temperature, is insoluble in the aqueous phase, and has minimal impact on the thermal conductivity of the grinding fluid, ensuring cooling efficiency. The organic rust inhibitor is protected within the microcapsules, preventing premature consumption during storage, transportation, and circulation, and is released centrally in the high-temperature grinding zone, significantly improving utilization.

[0011] Preferably, in the preparation of the microcapsule rust inhibitor, the wall material monomer is composed of methyl methacrylate, butyl acrylate and ethylene glycol dimethacrylate, and the weight ratio of methyl methacrylate, butyl acrylate and ethylene glycol dimethacrylate is (13-15):(4.5-5.5):1.

[0012] By adopting the above technical solution, methyl methacrylate provides the rigid skeleton and mechanical strength of the wall material; butyl acrylate provides flexibility and film-forming properties, improving brittleness; ethylene glycol dimethacrylate provides crosslinking points to form a three-dimensional network structure; the combination of the three monomers results in a copolymer with good film-forming properties and compatibility with organic rust inhibitors, which is conducive to forming a dense coating layer and can form a wall material structure that is both rigid and flexible, maintaining its integrity at room temperature and being controllably released when simultaneously subjected to heat and mechanical shearing in the grinding zone.

[0013] Preferably, in the preparation of the microcapsule rust inhibitor, the organic rust inhibitor is composed of triethanolamine borate, oleamide ester and benzotriazole, and the weight ratio of triethanolamine borate, oleamide ester and benzotriazole is (25-35):(18-24):1.

[0014] By adopting the above technical solution, triethanolamine borate ester, a boron- and nitrogen-containing organic ester, can form a dense borate ester protective film on the metal surface, while inhibiting the anodic reaction through nitrogen atom adsorption on the metal surface; oleamide ester, a long-chain fatty acid ester, forms a hydrophobic oil film on the metal surface through the directional arrangement of long carbon chains, isolating moisture and oxygen; benzotriazole, a nitrogen-containing heterocyclic compound, forms a stable complex with copper ions through nitrogen heterocycles, forming a protective film on the copper surface; the combination of the three can simultaneously protect various metal workpieces such as cast iron, carbon steel, copper alloys, and aluminum alloys, achieving broad-spectrum rust prevention protection; at the same time, the above-mentioned organic rust inhibitors have good compatibility with wall materials, which is beneficial to microcapsule encapsulation and core material stability, thus ultimately obtaining a microcapsule rust inhibitor with excellent and stable application performance.

[0015] Preferably, in the microcapsule rust inhibitor, the weight ratio of the core material to the wall material is 1:(2-3).

[0016] By adopting the above technical solution, a sufficient amount of wall material can form a complete and dense coating layer, effectively encapsulating the core material and reducing core material loss during the preparation process. Furthermore, it ensures that each microcapsule contains enough effective rust inhibitor components without compromising the integrity of the wall material due to excessive loading. Simultaneously, the above ratio also allows for the formation of a sufficiently thick shell layer, ensuring storage stability and controllable release in the grinding zone, guaranteeing that the microcapsule rust inhibitor exerts its optimal effect during application.

[0017] Preferably, the microcapsule rust inhibitor has a particle size of 5-10 μm.

[0018] By adopting the above technical solution, the microcapsule rust inhibitor can maintain a good suspension state in the grinding fluid circulation system, avoiding deposition at the bottom of the storage tank. Moreover, with a particle size, the core material diffuses and releases at a moderate rate through the wall material, continuously releasing the rust inhibitor in the grinding zone and forming a uniform rust inhibitor release layer on the workpiece surface, thereby enabling the microcapsule rust inhibitor to achieve a more stable application effect.

[0019] Preferably, the lubricant is one or a combination of several of the following: polyether, diethylene glycol, polyethylene glycol, boric acid, potassium tetraborate, propylene glycol, glycerol, carboxylic acid, amide, fatty acid ester, carbonate, polyvinyl alcohol diester, and isomeric alcohol polyoxyethylene ether.

[0020] By adopting the above technical solutions, different metal materials have different adsorption and reactivity to lubricants, and can be selected and combined according to the needs of actual applications. Moreover, the above combinations of lubricants can meet the basic lubrication requirements of grinding fluids.

[0021] Preferably, the extreme pressure agent is one or a combination of several of isobutylene sulfide, triphenyl phosphite, ammonium phosphate, and phosphite.

[0022] By adopting the above technical solutions, different extreme pressure agents have different activation temperatures. By combining different extreme pressure agents, grinding conditions ranging from light load to heavy load can be covered. Moreover, whether a single extreme pressure agent or a compound combination is used, the above extreme pressure agents can form an effective extreme pressure protective film in the grinding zone.

[0023] Secondly, this application provides a method for preparing a fully synthetic grinding fluid that combines cooling and rust prevention functions, using the following technical solution: A method for preparing a fully synthetic grinding fluid with both cooling and rust-preventing functions includes the following steps: (1) Prepare raw materials containing water, lubricant, extreme pressure agent, surfactant, defoamer, preservative and microcapsule rust inhibitor according to the formula; (2) After heating and mixing the water, extreme pressure agent, surfactant, preservative and microcapsule rust inhibitor in step (1) evenly, add lubricant and defoamer, and stir at room temperature to obtain a fully synthetic grinding fluid with both cooling and rust prevention functions.

[0024] By adopting the above technical solution, the above preparation method is simple to operate. The feeding sequence ensures that the raw materials are evenly dispersed, and the temperature control takes into account the thermal sensitivity of each component, thereby ensuring stable product quality. It is not only suitable for large-scale industrial production, but also can produce a high-quality and stable fully synthetic grinding fluid with cooling and rust prevention functions.

[0025] In summary, this application has the following beneficial effects: This application utilizes a microcapsule rust inhibitor obtained through microencapsulation technology in a fully synthetic grinding fluid. The microcapsule rust inhibitor exists in solid particle form at room temperature, is insoluble in the aqueous phase, and has minimal impact on the thermal conductivity of the grinding fluid, thus ensuring cooling efficiency. The organic rust inhibitor is protected within the microcapsules, preventing premature consumption during storage, transportation, and circulation. When the temperature in the grinding zone rises or is subjected to mechanical shearing, the wall material ruptures, releasing the organic rust inhibitor, achieving "on-demand release." This ensures high-temperature rust prevention while avoiding negative impacts on cooling performance, and significantly improves utilization. Detailed Implementation

[0026] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0027] Unless otherwise specified, all raw materials used in the embodiments and comparative examples of this application are commercially available.

[0028] The lubricant was purchased from Dongguan Heshibi New Materials Co., Ltd. as DS5740 polyether ester fully synthetic lubricant additive. The surfactant was purchased from BASF as Lutensol TO-12 nonionic surfactant; The defoamer was purchased from Dow Corning AFE1247; The preservative was purchased from Nanjing Baiju Technology Co., Ltd. as BIT10 bactericidal preservative.

[0029] Preparation examples of raw materials and / or intermediates Preparation Example 1 A microcapsule rust inhibitor is prepared by the following method: S1. Dissolve the wall material monomer in ethyl acetate at a ratio of 1g:10mL, and add 5% (by weight) of Tween 80 emulsifier to obtain a wall material solution. Simultaneously, mix the protective colloid (polyvinyl alcohol PVA, CAS No.: 9002-89-5) and water at a ratio of 1g:150mL, heat to 45℃ and stir to obtain an aqueous phase solution. When using, the weight ratio of the wall material solution to the aqueous phase solution is 1:3. S2. Take the organic rust inhibitor raw material as the core material and add it to the wall material solution obtained in step S1. Stir and disperse at 350 rpm for 15 min, and then drop it into the aqueous phase solution obtained in step S1. During the process, perform high-speed shearing at 1200 rpm for 15 min to obtain a mixed emulsion. S3. Add potassium persulfate, an initiator accounting for 3% of the weight of the wall material monomer, to the mixed emulsion obtained in step S2. Heat to 65°C and react for 5 hours, stirring at 350 rpm during the process. After the reaction is completed, cool the mixture first, then add sodium chloride, a demulsifier, for sedimentation. Finally, after centrifugation, washing with deionized water, vacuum drying, and sieving, obtain the microcapsule rust inhibitor.

[0030] Note: In the above operations, the wall material monomers consist of methyl methacrylate, butyl acrylate, and ethylene glycol dimethacrylate, with a weight ratio of methyl methacrylate, butyl acrylate, and ethylene glycol dimethacrylate of 14:5:1. The organic rust inhibitor consists of triethanolamine borate, oleamide ester, and benzotriazole, with a weight ratio of triethanolamine borate, oleamide ester, and benzotriazole of 30:21:1. In the resulting microcapsule rust inhibitor, the weight ratio of core material to wall material is 1:2.5. The particle size of the microcapsule rust inhibitor is 7.5 μm.

[0031] Preparation Example 2 A microcapsule rust inhibitor differs from Preparation Example 1 in that the wall material monomer is composed of methyl methacrylate, butyl acrylate and ethylene glycol dimethacrylate, and the weight ratio of methyl methacrylate, butyl acrylate and ethylene glycol dimethacrylate is 13:4.5:1.

[0032] Preparation Example 3 A microcapsule rust inhibitor differs from Preparation Example 1 in that the wall material monomer is composed of methyl methacrylate, butyl acrylate and ethylene glycol dimethacrylate, and the weight ratio of methyl methacrylate, butyl acrylate and ethylene glycol dimethacrylate is 15:5.5:1.

[0033] Preparation Example 4 A microcapsule rust inhibitor, which differs from Preparation Example 1, is an organic rust inhibitor composed of triethanolamine borate, oleamide ester and benzotriazole, wherein the weight ratio of triethanolamine borate, oleamide ester and benzotriazole is 25:18:1.

[0034] Preparation Example 5 A microcapsule rust inhibitor, which differs from Preparation Example 1, is an organic rust inhibitor composed of triethanolamine borate, oleamide ester and benzotriazole, wherein the weight ratio of triethanolamine borate, oleamide ester and benzotriazole is 35:24:1.

[0035] Preparation Example 6 A microcapsule rust inhibitor differs from Preparation Example 1 in that the weight ratio of the core material to the wall material in the obtained microcapsule rust inhibitor is 1:2.

[0036] Preparation Example 7 A microcapsule rust inhibitor differs from Preparation Example 1 in that the weight ratio of the core material to the wall material in the obtained microcapsule rust inhibitor is 1:3.

[0037] Preparation Example 8 A microcapsule rust inhibitor, which differs from Preparation Example 1 in that the microcapsule rust inhibitor has a particle size of 5 μm.

[0038] Preparation Example 9 A microcapsule rust inhibitor, which differs from Preparation Example 1 in that the microcapsule rust inhibitor has a particle size of 10 μm.

[0039] Example 1 A fully synthetic grinding fluid with both cooling and rust-preventing functions is prepared by means of the raw materials and their corresponding weight parts as shown in Table 1, and is obtained through the following steps: (1) Prepare raw materials containing water, lubricant, extreme pressure agent, surfactant, defoamer, preservative and microcapsule rust inhibitor according to the formula; (2) After heating the water, extreme pressure agent, surfactant, preservative and microcapsule rust inhibitor in step (1) to 60°C and mixing them evenly, add lubricant and defoamer and stir at room temperature to obtain a fully synthetic grinding fluid with both cooling and rust prevention functions.

[0040] Note: In the above operation, the extreme pressure agent is composed of isobutylene sulfide, phosphate ester amine salt, and phosphite in a weight ratio of 3:1:1. The microencapsulated rust inhibitor was obtained from Preparation Example 1.

[0041] Example 2-3 A fully synthetic grinding fluid with both cooling and rust prevention functions differs from Example 1 in that the raw materials used in its preparation and their corresponding weight parts are shown in Table 1.

[0042] Table 1. Raw materials used in the preparation of Examples 1-3 and their corresponding weight parts (parts / kg) Example 4 A fully synthetic grinding fluid with both cooling and rust prevention functions, differing from Example 1 in that the microcapsule rust inhibitor was obtained from Preparation Example 2.

[0043] Example 5 A fully synthetic grinding fluid with both cooling and rust prevention functions, which differs from Example 1 in that the microcapsule rust inhibitor is obtained from Preparation Example 3.

[0044] Example 6 A fully synthetic grinding fluid with both cooling and rust prevention functions, differing from Example 1 in that the microcapsule rust inhibitor was obtained from Preparation Example 4.

[0045] Example 7 A fully synthetic grinding fluid with both cooling and rust prevention functions, differing from Example 1 in that the microcapsule rust inhibitor was obtained from Preparation Example 5.

[0046] Example 8 A fully synthetic grinding fluid with both cooling and rust prevention functions, differing from Example 1 in that the microcapsule rust inhibitor was obtained from Preparation Example 6.

[0047] Example 9 A fully synthetic grinding fluid with both cooling and rust prevention functions, which differs from Example 1 in that the microcapsule rust inhibitor is obtained from Preparation Example 7.

[0048] Example 10 A fully synthetic grinding fluid with both cooling and rust prevention functions, which differs from Example 1 in that the microcapsule rust inhibitor is obtained from Preparation Example 8.

[0049] Example 11 A fully synthetic grinding fluid with both cooling and rust prevention functions, which differs from Example 1 in that the microcapsule rust inhibitor is obtained from Preparation Example 9.

[0050] Comparative Example Comparative Example 1 A fully synthetic grinding fluid with both cooling and rust prevention functions differs from Example 1 in that the microcapsule rust inhibitor is replaced with an organic rust inhibitor raw material, and the weight of the organic rust inhibitors in both is the same.

[0051] Performance testing Test samples: The fully synthetic grinding fluid with cooling and rust prevention functions obtained in Examples 1-11 was selected as test samples 1-11, and the fully synthetic grinding fluid with cooling and rust prevention functions obtained in Comparative Example 1 was selected as control sample 1.

[0052] Test method: The fully synthetic grinding fluid with both cooling and rust-preventing functions was diluted to 5% with deionized water for grinding application. The workpiece (45# steel specimen, surface roughness Ra≤0.8μm) was ground using a grinding test machine (using white corundum grinding wheel WA46K5V). During the grinding process, the following settings were used: grinding wheel linear speed 35m / s, grinding depth 0.05mm, grinding fluid flow rate 10L / min, grinding length 50mm, grinding width 10mm, and feed rate 0.5m / min. An infrared thermometer was used to measure the temperature 5mm behind the grinding area immediately after grinding was completed. The temperature rise rate during the grinding process was then calculated. The smaller the temperature rise rate, the better the cooling effect.

[0053] After grinding, the workpiece is blotted with filter paper to remove edge droplets, and then placed in a constant temperature and humidity chamber. The temperature is set at 35±2℃ and the relative humidity at 85%. After 24 hours, the workpiece is removed and the surface of the test piece is observed with a magnifying glass. The score is then determined according to the following criteria: 10 points -- No rust: The surface is bright and free of any rust spots; 7-10 points (inclusive of 7 points, exclusive of 10 points) -- Slight corrosion: 1-3 rust spots (diameter <1mm) or slight corrosion at the edges; 3-7 points (inclusive of 3 points, exclusive of 7 points) -- Obvious rust: Multiple rust spots or flaky rust patches appear; 0-3 points (inclusive of 0 points, exclusive of 3 points) Severe corrosion: large-area corrosion; After performing the above tests on test samples 1-11 and control sample 1, the test results are recorded in Table 2.

[0054] Table 2 Test results of test samples 1-11 and control sample 1 As can be seen from Examples 1-11 and Comparative Example 1, and Table 2, this application, by using microcapsule rust inhibitors obtained through microcapsule encapsulation technology in fully synthetic grinding fluids, can further improve the rust prevention effect while ensuring the excellent cooling performance of the fully synthetic grinding fluids. This ensures high-temperature rust prevention while avoiding negative impacts on cooling performance, thus better protecting the workpiece. As can be seen from the above test results, the measured temperature rise rate and rust prevention function score are significantly improved compared to the case of directly adding organic rust inhibitors.

[0055] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A fully synthetic grinding fluid with both cooling and rust-preventing functions, characterized in that, Made from the following ingredients in parts by weight: 60-85 parts water; 5-15 parts lubricant; Extreme pressure agent 1-5 parts; 1-3 parts surfactant; 0.1-0.5 parts of defoamer; Preservative: 0.1-0.3 parts; 3-8 parts of microcapsule rust inhibitor; The microcapsule rust inhibitor was prepared by the following method: S1. Dissolve the wall material monomer in an organic solvent and add an emulsifier to mix, thus obtaining a wall material solution; simultaneously, mix the protective colloid and water, heat and stir to obtain an aqueous solution; S2. Take the organic rust inhibitor raw material as the core material and add it to the wall material solution obtained in step S1. After stirring and dispersing, add it dropwise to the aqueous phase solution obtained in step S1. During the process, high-speed shearing is carried out to obtain a mixed emulsion. S3. Add an initiator to the mixed emulsion obtained in step S2, heat the mixture and stir during the reaction. After the reaction is complete, cool the mixture and add a demulsifier for sedimentation. Finally, centrifuge, wash, dry and sieve the mixture to obtain the microcapsule rust inhibitor.

2. The fully synthetic grinding fluid with both cooling and rust-preventing functions according to claim 1, characterized in that: In the preparation of the microcapsule rust inhibitor, the wall material monomer is composed of methyl methacrylate, butyl acrylate and ethylene glycol dimethacrylate, and the weight ratio of methyl methacrylate, butyl acrylate and ethylene glycol dimethacrylate is (13-15):(4.5-5.5):

1.

3. The fully synthetic grinding fluid with both cooling and rust-preventing functions according to claim 1, characterized in that: In the preparation of the microcapsule rust inhibitor, the organic rust inhibitor is composed of triethanolamine borate, oleamide ester and benzotriazole, and the weight ratio of triethanolamine borate, oleamide ester and benzotriazole is (25-35):(18-24):

1.

4. The fully synthetic grinding fluid with both cooling and rust-preventing functions according to claim 1, characterized in that: In the microcapsule rust inhibitor, the weight ratio of the core material to the wall material is 1:(2-3).

5. The fully synthetic grinding fluid with both cooling and rust-preventing functions according to claim 1, characterized in that: The microcapsule rust inhibitor has a particle size of 5-10 μm.

6. The fully synthetic grinding fluid with both cooling and rust-preventing functions according to claim 1, characterized in that: The lubricant is one or a combination of several of the following: polyether, diethylene glycol, polyethylene glycol, boric acid, potassium tetraborate, propylene glycol, glycerol, carboxylic acid, amide, fatty acid ester, carbonate, polyvinyl alcohol diester, and isomeric alcohol polyoxyethylene ether.

7. The fully synthetic grinding fluid with both cooling and rust-preventing functions according to claim 1, characterized in that: The extreme pressure agent is one or a combination of several of the following: isobutylene sulfide, triphenyl phosphite, ammonium phosphate, and phosphite.

8. The method for preparing the fully synthetic grinding fluid with both cooling and rust-preventing functions as described in claim 1, characterized in that: Includes the following steps: (1) Prepare raw materials containing water, lubricant, extreme pressure agent, surfactant, defoamer, preservative and microcapsule rust inhibitor according to the formula; (2) After heating and mixing the water, extreme pressure agent, surfactant, preservative and microcapsule rust inhibitor in step (1) evenly, add lubricant and defoamer, and stir at room temperature to obtain a fully synthetic grinding fluid with both cooling and rust prevention functions.

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