Corrosion-resistant cutting fluid and preparation method thereof

Abstract

The invention discloses a corrosion-resistant cutting fluid and a preparation method thereof, and relates to the technical field of metal working fluids. The corrosion-resistant cutting fluid takes the calcium phytate, the modified graphene oxide composite dispersion liquid, the antibacterial agent, the epoxidized soybean oil modified boric acid ester and other environment-friendly components as cores, synergistically exerts rust-proof, antibacterial and lubricating effects, and is especially suitable for high-activity metal processing of 7-series aluminum alloys, magnesium alloys and the like. The preparation process is mild, the steps are simple, and the obtained product is stable in high-temperature storage, not prone to decay and long in service life and has excellent environment compatibility and industrial applicability. The corrosion-resistant cutting fluid is excellent in anti-rust performance, antibacterial performance and high-temperature stability and has a wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal processing fluid, in particular to a corrosion-resistant cutting fluid and a preparation method thereof. BACKGROUND

[0002] In the field of metal processing, cutting fluid is a key auxiliary material to ensure the smooth progress of the processing process. Its main role is to cool and lubricate the tool and workpiece during metal cutting, grinding and other processing, reduce friction and wear, and at the same time, it can also play the role of rust prevention, metal corrosion inhibition and cleaning of processing debris, so as to improve the processing precision, prolong the tool life and protect the workpiece surface quality. However, there are still many problems in the actual application of the existing cutting fluid, which seriously restricts the efficient, green and sustainable development of the metal processing industry, and it is urgent to overcome these problems through technical innovation.

[0003] The rust prevention performance of the existing cutting fluid has obvious deficiencies. Most of the corrosion inhibitors widely used at present are amines, carboxylates, etc. These corrosion inhibitors mainly rely on physical adsorption to form a protective film on the metal surface, but the binding force of the protective film is weak and easy to fall off. Especially when processing high-activity metals such as 7-series aluminum alloy and magnesium alloy, it is difficult for this kind of corrosion inhibitor to effectively prevent the occurrence of electrochemical corrosion, resulting in common pitting corrosion and intergranular corrosion, which seriously affects the service life of precision parts and brings great challenges to the quality control of the metal processing industry.

[0004] The biological stability of the existing water-based cutting fluid is poor. Its formula usually contains organic components such as alcohol amine and ester, which are easy to become a source of nutrition for microorganisms. Under suitable environmental conditions, microorganisms will multiply in large numbers, which will cause the performance of the cutting fluid system to decrease significantly, such as pH value reduction, generation of foul-smelling gas, and the acid substances produced by microbial metabolism will also cause corrosion to the machine tool pipeline, increasing the equipment maintenance cost and production safety hazard, and affecting the normal operation of metal processing production.

[0005] The environmental compatibility of the existing cutting fluid also has many problems. In order to improve the performance of the cutting fluid, the existing technology often uses benzene solvents or toxic isocyanate substances for chemical modification, which greatly increases the difficulty of treatment of cutting fluid waste liquid, keeps the treatment cost high, and causes great burden to the environment. In addition, the preparation process of some cutting fluids is complicated, which has problems such as high energy consumption and harsh reaction conditions, not only increases the production difficulty and cost, but also may produce harmful emissions due to residual substances or reaction process, further aggravating the negative impact on the environment.

[0006] Therefore, according to the limitations of the above-mentioned related technologies, it is urgent to develop a corrosion-resistant cutting fluid and a preparation method thereof. SUMMARY

[0007] Therefore, the present application aims to provide a kind of corrosion-resistant cutting fluid and preparation method thereof, effectively solve the problems of existing cutting fluid in rust prevention performance, biological stability and environmental compatibility.

[0008] To solve the above problems in the prior art, the present application is realized by the following technical solutions: In one aspect, the present application provides a kind of corrosion-resistant cutting fluid, the weight parts of each raw material in the corrosion-resistant cutting fluid are as follows: naphthenic base oil 15-40 parts, paraffin base oil 20-50 parts, calcium phytate 8-12 parts, modified graphene oxide composite dispersion 300-500 parts, lauroyl sarcosine 3-6 parts, antibacterial agent 0.5-0.8 parts, epoxy soybean oil modified boric acid ester 10-18 parts, fatty alcohol polyoxyethylene ether 10-20 parts, monoethanolamine 5-10 parts, triethanolamine 10-15 parts, defoaming agent 1-2 parts, dodecanedioic acid 3-8 parts and phosphate 6-2 parts.

[0009] Further, the naphthenic base oil is at least one of rubber oil KN4006 and rubber oil KN4010.

[0010] Further, the paraffin base oil is at least one of base oil 150SN and base oil 250SN.

[0011] Further, the preparation method of calcium phytate is as follows: after mixing phytic acid and deionized water uniformly, Ca (OH) 2 is added, the temperature is raised to 50-60 DEG C, and the reaction is carried out for 1-2 h, then the temperature is cooled to room temperature, and the product is aged for 3-4 h, centrifuged and dried to obtain calcium phytate.

[0012] Further, the drying condition is 70-80 DEG C for 6-10 h.

[0013] Further, the mass ratio of phytic acid, deionized water and Ca (OH) 2 is 10:24-30:3.3-4.

[0014] Further, the preparation method of the modified graphene oxide composite dispersion is as follows: graphene oxide is added to polyether amine aqueous solution, ultrasonic dispersion is carried out for 30-50 min, silane coupling agent KH-560 is added, and stirring is carried out at 50-60 DEG C for 2-3 h to obtain modified graphene oxide composite dispersion.

[0015] Further, the power of ultrasonic dispersion is 800-1000 watts.

[0016] Further, the preparation method of the modified graphene oxide composite dispersion: graphene oxide, nano zinc oxide is added into polyether amine aqueous solution, ultrasonic dispersion for 30min-50min, silane coupling agent is added, stirring at 50℃-60℃ for 2h-3h, to obtain modified graphene oxide composite dispersion.

[0017] Further, the mass ratio of the graphene oxide, nano zinc oxide, polyether amine aqueous solution and silane coupling agent is 5:1-2:300-500:1-4.

[0018] Further, the mass fraction of the polyether amine aqueous solution is 0.5%-0.1%.

[0019] Further, the preparation method of the epoxy soybean oil modified borate ester: diethanolamine borate ester and epoxy soybean oil are uniformly mixed, nitrogen is introduced to exhaust air, the temperature is increased to 110℃-120℃, the stirring speed is controlled at 300rpm-500rpm, and the reaction is carried out for 3h-5h to obtain the epoxy soybean oil modified borate ester.

[0020] Further, the mass ratio of the diethanolamine borate ester and epoxy soybean oil is 10:7-11.

[0021] In another aspect, the application provides a preparation method of a corrosion-resistant cutting fluid, comprising the following preparation steps: The naphthenic base oil, paraffin base oil, epoxy soybean oil modified borate ester, fatty alcohol polyoxyethylene ether, monoethanolamine, triethanolamine, defoaming agent, dodecanedioic acid, phosphate ester and modified graphene oxide composite dispersion are uniformly mixed, heated to 55℃-60℃, the stirring speed is controlled at 100rpm-200rpm, calcium phytate is added, the temperature is controlled at 60℃-65℃ during the addition of calcium phytate, after the addition of calcium phytate is completed, the temperature is decreased to 40℃-45℃, lauroyl sarcosine is added, stirring for 10min-15min, the temperature is decreased to 20℃-30℃, an antibacterial agent is added, stirring for 20min-40min, filtration, tanking, to obtain the corrosion-resistant cutting fluid.

[0022] Further, the antibacterial agent is at least one of polyhexamethylene biguanide, benzisothiazolinone and chloromethyl isothiazolinone.

[0023] Further, the defoaming agent is at least one of polydimethylsiloxane and polyoxypropylene glycerol ether.

[0024] The application has the following beneficial effects: Significantly improve the rust prevention ability: the abundant hydroxyl groups on the surface of nano zinc oxide can form a multi-coordinate structure with the phosphate groups in calcium phytate and the oxygen-containing functional groups of modified graphene oxide, further densifying the passivation film on the metal surface, enhancing the adhesion and corrosion resistance of the film layer to high-activity metals. At the same time, Zn2+ The ion migration in electrochemical corrosion can be inhibited by filling the defects of the film layer, and the occurrence rate of pitting and intergranular corrosion can be significantly reduced by forming a triple protection with calcium phytate and modified graphene oxide.

[0025] Enhanced antibacterial property: the antibacterial combination of nano zinc oxide, antibacterial agent and modified graphene oxide in the formula forms a multi-dimensional antibacterial system of chemical antibacterial and physical destruction, which can effectively inhibit the reproduction of microorganisms, avoid the corruption, odor and performance degradation of cutting fluid caused by bacterial growth, and reduce the maintenance frequency and cost.

[0026] Improved environmental compatibility: the use of environmentally friendly raw materials such as epoxy soybean oil modified borate ester avoids the use of toxic and harmful ingredients such as benzene or isocyanate, so that the cutting fluid has little impact on the environment during use and waste liquid treatment, and meets the requirements of green manufacturing.

[0027] Simple process and high stability: the preparation process has mild reaction conditions, does not require high temperature and pressure or complex equipment, and the product has no stratification and precipitation under high temperature long-term storage, has good storage and use stability, and is suitable for industrial scale production. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described below. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] In the embodiments of the present application, graphene oxide is purchased from Nanjing Xianfeng Nanometer Material Technology Co., Ltd., model XF002, purity ≥ 99%.

[0030] In the embodiments of the present application, the polyetheramine is polyetheramine D230, which is purchased from Guangzhou Huisheng Chemical Product Co., Ltd.

[0031] In the embodiments of the present application, the epoxy value of the epoxy soybean oil is ≥ 6.0%, and the acid value is ≤ 0.5 mgKOH / g.

[0032] In the embodiments of the present application, nano zinc oxide is purchased from Nanjing Xianfeng Nanometer Material Technology Co., Ltd., model XFI06, purity ≥ 99%.

[0033] Example 1 A preparation method of a corrosion-resistant cutting fluid, comprising the following preparation steps: S1: uniformly mix 10 parts of phytic acid and 27 parts of deionized water, add 3.6 parts of Ca(OH)2, heat to 55℃, react for 1.5h, cool to room temperature, age for 3.5h, centrifuge, and dry at 75℃ for 8h to obtain calcium phytate.

[0034] S2: 5 parts of graphene oxide, 1.5 parts of nano zinc oxide, 400 parts of polyether amine D230 aqueous solution with a mass fraction of 0.8%, ultrasonic power of 900 watts, ultrasonic dispersion for 30 min, 2 parts of silane coupling agent KH-560, stirring at 50°C for 3h, to obtain modified graphene oxide composite dispersion.

[0035] S3: 10 parts of diethanolamine borate and 9 parts of epoxy soybean oil are uniformly mixed, nitrogen is introduced to remove air, the temperature is raised to 115°C, the stirring speed is controlled at 400 rpm, and the reaction is carried out for 4h to obtain an epoxy soybean oil modified borate.

[0036] S4: 28 parts of rubber oil KN4006, 35 parts of base oil 250SN, 14 parts of epoxy soybean oil modified borate, 15 parts of fatty alcohol polyoxyethylene ether, 8 parts of monoethanolamine, 12 parts of triethanolamine, 1.5 parts of polydimethylsiloxane, 6 parts of dodecanedioic acid, 9 parts of phosphate, and 400 parts of modified graphene oxide composite dispersion are uniformly mixed, heated to 58°C, the stirring speed is controlled at 150 rpm, 10 parts of calcium phytate is added, the temperature is controlled at 62.5°C during the addition of calcium phytate, after the addition of calcium phytate is completed, the temperature is lowered to 43°C, 4.5 parts of lauroyl sarcosine is added, stirring for 12 min, the temperature is lowered to 25°C, 0.6 parts of polyhexamethylene biguanide is added, stirring for 30 min, and then filtered through a 0.22 μm ceramic membrane to obtain a corrosion-resistant cutting fluid.

[0037] Example 2 A method for preparing a corrosion-resistant cutting fluid, comprising the following preparation steps: S1: 10 parts of phytic acid and 24 parts of deionized water are uniformly mixed, then 3.6 parts of Ca(OH)2 is added, the temperature is raised to 50°C, the reaction is carried out for 2h, the temperature is cooled to room temperature, and the mixture is aged for 3h, centrifuged, and dried at 70°C for 10h to obtain calcium phytate.

[0038] S2: 5 parts of graphene oxide, 1 part of nano zinc oxide, and 300 parts of polyether amine D230 aqueous solution with a mass fraction of 0.5% are added, the ultrasonic power is 1000 watts, ultrasonic dispersion is carried out for 30 min, 1 part of silane coupling agent KH-560 is added, stirring is carried out at 50°C for 2h to obtain a modified graphene oxide composite dispersion.

[0039] S3: 10 parts of diethanolamine borate and 7 parts of epoxy soybean oil are uniformly mixed, nitrogen is introduced to remove air, the temperature is raised to 110°C, the stirring speed is controlled at 500 rpm, and the reaction is carried out for 5h to obtain an epoxy soybean oil modified borate.

[0040] S4: 15 parts of base oil 150SN, 20 parts of rubber oil KN4006, 10 parts of epoxy soybean oil modified borate, 10 parts of fatty alcohol polyoxyethylene ether, 5 parts of monoethanolamine, 10 parts of triethanolamine, 1 part of polyoxypropylene glycerol ether, 3 parts of dodecanedioic acid, 6 parts of phosphate ester and 300 parts of modified graphene oxide composite dispersion liquid were uniformly mixed, heated to 55°C, the stirring speed was controlled at 200 rpm, 8 parts of calcium phytate was added, during the addition of calcium phytate, the temperature was controlled at 60°C, after the addition of calcium phytate was completed, the temperature was lowered to 40°C, 4.5 parts of lauroyl sarcosine was added, stirred for 10 min, the temperature was lowered to 20°C, 0.5 parts of polyhexamethylene biguanide was added, stirred for 40 min, filtered through a 0.22 μm ceramic membrane, and canned to obtain a corrosion-resistant cutting fluid.

[0041] Example 3 A preparation method of a corrosion-resistant cutting fluid, comprising the following preparation steps: S1: 10 parts of phytic acid and 25 parts of deionized water were uniformly mixed, then 3.5 parts of Ca(OH)2 was added, the temperature was raised to 52°C, reacted for 1.7 h, cooled to room temperature, aged for 3.5 h, centrifuged, and dried at 72°C for 8 h to obtain calcium phytate.

[0042] S2: 5 parts of graphene oxide and 1 part of nano zinc oxide were added to 350 parts of polyetheramine D230 aqueous solution with a mass fraction of 0.6%, ultrasonic dispersion was carried out at an ultrasonic power of 1000 watts for 35 min, 1.5 parts of silane coupling agent KH-560 was added, and stirring was carried out at 52°C for 2.8 h to obtain a modified graphene oxide composite dispersion liquid.

[0043] S3: 10 parts of diethanolamine borate and 8 parts of epoxy soybean oil were uniformly mixed, nitrogen was introduced to remove air, the temperature was raised to 112°C, the stirring speed was controlled at 450 rpm, and reaction was carried out for 4.5 h to obtain an epoxy soybean oil modified borate.

[0044] S4: 20 parts of rubber oil KN4010, 25 parts of base oil 150SN, 12 parts of epoxy soybean oil modified borate, 12 parts of fatty alcohol polyoxyethylene ether, 6 parts of monoethanolamine, 12 parts of triethanolamine, 0.6 parts of polydimethylsiloxane, 0.6 parts of polyoxypropylene glycerol ether, 4 parts of dodecanedioic acid, 8 parts of phosphate ester and 350 parts of modified graphene oxide composite dispersion liquid were uniformly mixed, heated to 56°C, the stirring speed was controlled at 180 rpm, 10 parts of calcium phytate was added, during the addition of calcium phytate, the temperature was controlled at 62°C, after the addition of calcium phytate was completed, the temperature was lowered to 42°C, 4.5 parts of lauroyl sarcosine was added, stirred for 10 min, the temperature was lowered to 23°C, 0.3 parts of polyhexamethylene biguanide and 0.3 parts of benzisothiazolinone were added, stirred for 35 min, filtered through a 0.22 μm ceramic membrane, and canned to obtain a corrosion-resistant cutting fluid.

[0045] Example 4 A preparation method of a corrosion-resistant cutting fluid, comprising the following preparation steps: S1: uniformly mix 10 parts of phytic acid and 29 parts of deionized water, then add 3.9 parts of Ca(OH)2, heat to 58°C, react for 1.2 hours, cool to room temperature, age for 3.6 hours, centrifuge, and dry at 78°C for 7 hours to obtain calcium phytate.

[0046] S2: add 5 parts of graphene oxide and 2 parts of nano zinc oxide to 450 parts of a polyetheramine D230 aqueous solution with a mass fraction of 0.9%, ultrasonic dispersion at a power of 800 watts for 45 minutes, add 2.5 parts of silane coupling agent KH-560, stir at 58°C for 2.2 hours to obtain modified graphene oxide composite dispersion.

[0047] S3: uniformly mix 10 parts of diethanolamine borate and 10 parts of epoxy soybean oil, introduce nitrogen to remove air, heat to 118°C, control the stirring speed at 350 rpm, and react for 3.5 hours to obtain epoxy soybean oil modified borate.

[0048] S4: uniformly mix 30 parts of rubber oil KN4010, 40 parts of base oil 250SN, 16 parts of epoxy soybean oil modified borate, 18 parts of fatty alcohol polyoxyethylene ether, 8 parts of monoethanolamine, 12 parts of triethanolamine, 0.8 parts of polydimethylsiloxane, 0.8 parts of polyoxypropylene glycerol ether, 7 parts of dodecanedioic acid, 10 parts of phosphate ester, and 450 parts of modified graphene oxide composite dispersion, heat to 58°C, control the stirring speed at 120 rpm, add 11 parts of calcium phytate, control the temperature at 64°C during the addition of calcium phytate, after the addition of calcium phytate is completed, cool to 44°C, add 5 parts of lauroyl sarcosine, stir for 15 minutes, cool to 28°C, add 0.4 parts of polyhexamethylene biguanide and 0.3 parts of benzisothiazolinone, stir for 25 minutes, filter through a 0.22 μm ceramic membrane, and then tank to obtain the corrosion-resistant cutting fluid.

[0049] Example 5 A preparation method of a corrosion-resistant cutting fluid, comprising the following preparation steps: S1: uniformly mix 10 parts of phytic acid and 30 parts of deionized water, then add 4 parts of Ca(OH)2, heat to 60°C, react for 1 hour, cool to room temperature, age for 4 hours, centrifuge, and dry at 80°C for 6 hours to obtain calcium phytate.

[0050] S2: add 5 parts of graphene oxide and 2 parts of nano zinc oxide to 500 parts of a polyetheramine D230 aqueous solution with a mass fraction of 1%, ultrasonic dispersion at a power of 800 watts for 50 minutes, add 3 parts of silane coupling agent KH-560, stir at 60°C for 2 hours to obtain modified graphene oxide composite dispersion.

[0051] S3: Mix diethanolamine borate 10 parts and epoxy soybean oil 11 parts evenly, introduce nitrogen to exhaust air, heat to 120℃, control stirring speed at 300 rpm, react for 3h, to obtain epoxy soybean oil modified borate.

[0052] S4: Mix rubber oil KN4006 40 parts, base oil 250SN 50 parts, epoxy soybean oil modified borate 18 parts, fatty alcohol polyoxyethylene ether 20 parts, monoethanolamine 10 parts, triethanolamine 15 parts, dimethicone 2 parts, dodecanedioic acid 8 parts, phosphate ester 12 parts and modified graphene oxide composite dispersion 500 parts evenly, heat to 60℃, control stirring speed at 100 rpm, add calcium phytate 12 parts, control temperature at 65℃ during calcium phytate adding, after calcium phytate adding, cool to 45℃, add lauroyl sarcosine 6 parts, stir for 15 min, cool to 30℃, add benzisothiazolinone 0.4 parts, chloromethylisothiazolinone 0.4 parts, stir for 20 min, filter through 0.22 μm ceramic membrane, to obtain corrosion resistant cutting fluid.

[0053] Comparative Example 1 This comparative example is compared with Example 1, replacing "calcium phytate" with the same mass of "phytic acid", and the rest of the steps and parameters are the same, this comparative example will not be repeated, finally the corrosion resistant cutting fluid is obtained.

[0054] Comparative Example 2 This comparative example is compared with Example 1, replacing "polyether amine D230 aqueous solution with a mass fraction of 0.8%" with the same mass of "deionized water", and the rest of the steps and parameters are the same, this comparative example will not be repeated, finally the corrosion resistant cutting fluid is obtained.

[0055] Comparative Example 3 This comparative example is compared with Example 1, replacing "epoxy soybean oil modified borate" with the same mass of "diethanolamine borate", and the rest of the steps and parameters are the same, this comparative example will not be repeated, finally the corrosion resistant cutting fluid is obtained.

[0056] Comparative Example 4 This comparative example is compared with Example 1, omitting S3 step, replacing "epoxy soybean oil modified borate" with the same mass of "mixture of diethanolamine borate and epoxy soybean oil", and the rest of the steps and parameters are the same, this comparative example will not be repeated, finally the corrosion resistant cutting fluid is obtained.

[0057] The preparation method of the mixture of diethanolamine borate and epoxy soybean oil is as follows: mix diethanolamine borate 10 parts and epoxy soybean oil 9 parts evenly, to obtain the mixture of diethanolamine borate and epoxy soybean oil.

[0058] The corrosion resistant cutting fluids prepared in Examples 1-5 and Comparative Examples 1-4 were subjected to performance testing, and the detailed results are shown in Table 1.

[0059] Rust prevention performance test: 7 series aluminum alloy (7075-T6) test pieces and magnesium alloy (AZ91D) mirror polished (Ra≤0.2 μm) were prepared, and the corrosion resistant cutting fluids prepared in Examples 1-5 and Comparative Examples 1-4 were sucked by a dropper, and were dropped on the test pieces in a quincunx format, five drops were dropped, each drop had a diameter of about 4-5 mm, the test pieces were placed in a 30°C constant temperature box, and after 24 h, the test pieces were taken out and observed, and were graded.

[0060] Rating criteria: Grade A: five drops of no rust Grade B: four drops of no rust Grade C: three drops of no rust Grade D: ≤ two drops of no rust Antibacterial performance test: according to the ISO 8199 standard, mixed bacteria were inoculated into the corrosion resistant cutting fluid stock solution, and were cultured at 28°C for 7 days, the total number of colonies was determined, and the antibacterial rate (%) was calculated.

[0061] Test bacteria: mixed bacteria consisting of Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 15442) and Staphylococcus aureus (ATCC 6538), the initial bacterial amount of the mixed bacteria was 10 6 CFU / mL.

[0062] %.

[0063] High temperature stability test: 100 mL of the corrosion resistant cutting fluid was sealed in a glass bottle, and was stored at 85°C for 30 days, and whether the corrosion resistant cutting fluid was stratified / precipitated was observed by visual observation.

[0064] Table 1 According to the test data analysis, the corrosion resistant cutting fluid prepared in Examples 1-5 of the present application has a comprehensive performance that is comprehensively optimized: it exhibits A-grade rust prevention ability on the surfaces of aluminum alloy and magnesium alloy (Examples 1, 3-5 are A / A, and Example 2 is A / B), the antibacterial rate on mixed bacteria is as high as 99.5%-99.8%, and it remains uniform and stable (without stratification / precipitation) after being stored at 85°C for 30 days. This indicates that the corrosion resistant cutting fluid prepared in the present application solves the three technical problems of high activity metal rust prevention, microbial breeding and high temperature stability.

[0065] Comparative Example 1 and Example 1 can be compared, the rust-proof grade of Comparative Example 1 is reduced from A / A to C / D (aluminum alloy) and D (magnesium alloy), the bacteriostatic rate is reduced to 98.2%, and the free phytic acid cannot form a stable chelate structure. The calcium ion in calcium phytate is combined with phytic acid through a coordination bond, and can form a dense passivation film on the metal surface (especially for active metals), while the free phytic acid is easily hydrolyzed and loses effectiveness, resulting in a significant decrease in rust-proof ability.

[0066] Comparative Example 2 and Example 1 can be compared, the rust-proof grade of Comparative Example 2 is reduced to B / C, and the bacteriostatic rate drops to 85.4%. Because deionized water is used to replace the aqueous polyetheramine solution, the surface modification and dispersion effect of the polyetheramine is lacking, resulting in agglomeration and inactivation of the graphene oxide, and the nanometer zinc oxide is also severely agglomerated due to the loss of surface binding and steric hindrance effect of the polyetheramine, which is affected by van der Waals force. The formation of the passivation film on the metal surface is affected by the synergistic participation of the graphene oxide and the nanometer zinc oxide, and the rust-proof ability is significantly reduced (the rust-proof grade is reduced to B / C). Moreover, the agglomerated particles affect the effective antibacterial synergism of the two components with the antibacterial agent and other components, and the bacteriostatic rate drops to 85.4%. In addition, the agglomerated particles destroy the uniformity of the system, resulting in obvious deterioration of the overall performance of the cutting fluid. In addition, the agglomerated particles destroy the stability of the system, and finally cause stratification and precipitation.

[0067] Comparative Example 3 and Example 1 can be compared, the rust-proof grade of Comparative Example 2 is reduced to B / B. The diethanolamine borate is easily hydrolyzed in a high-temperature / acidic environment to generate boric acid precipitate, and the hydrolysis product destroys the synergistic effect of the corrosion inhibitor, resulting in an incomplete passivation film and weakened protection for high-activity metals.

[0068] Comparative Example 4 and Example 1 can be compared, the diethanolamine borate and the epoxy soybean oil in Comparative Example 4 are simply mixed and do not form a chemical bond, have poor compatibility, are easily precipitated at high temperatures, and cannot form a continuous and stable protective film, resulting in weakened protection for high-activity metals and a decrease in rust-proof grade and stability.

[0069] The above content is only an example and description of the concept of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the concept of the present application or exceed the scope defined by the present claims, and should belong to the protection scope of the present application.

Claims

1. A corrosion-resistant cutting fluid, characterized in that, The corrosion-resistant cutting fluid contains the following raw materials in the following weight proportions: 15-40 parts naphthenic base oil, 20-50 parts paraffinic base oil, 8-12 parts calcium phytate, 300-500 parts modified graphene oxide composite dispersion, 3-6 parts lauroyl sarcosine, 0.5-0.8 parts antibacterial agent, 10-18 parts epoxidized soybean oil modified borate ester, 10-20 parts fatty alcohol polyoxyethylene ether, 5-10 parts monoethanolamine, 10-15 parts triethanolamine, 1-2 parts defoamer, 3-8 parts dodecanoic acid, and 6-12 parts phosphate ester.

2. The corrosion-resistant cutting fluid according to claim 1, characterized in that, The method for preparing calcium phytate is as follows: phytic acid and deionized water are mixed evenly, then Ca(OH)2 is added, the temperature is raised to 50℃-60℃, the reaction is carried out for 1h-2h, the mixture is cooled to room temperature, aged for 3h-4h, centrifuged, and dried to obtain calcium phytate.

3. The corrosion-resistant cutting fluid according to claim 2, characterized in that, The mass ratio of phytic acid, deionized water and Ca(OH)2 is 10:24-30:3.3-4.

4. The corrosion-resistant cutting fluid according to claim 1, characterized in that, The modified graphene oxide composite dispersion is prepared by adding graphene oxide and nano zinc oxide to a polyetheramine aqueous solution, ultrasonically dispersing for 30-50 minutes, adding a silane coupling agent, and stirring at 50℃-60℃ for 2-3 hours to obtain the modified graphene oxide composite dispersion.

5. The corrosion-resistant cutting fluid according to claim 4, characterized in that, The preparation method of the modified graphene oxide composite dispersion is as follows: the mass ratio of graphene oxide, nano zinc oxide, polyetheramine aqueous solution and silane coupling agent is 5:1-2:300-500:1-4.

6. The corrosion-resistant cutting fluid according to claim 5, characterized in that, The mass fraction of the polyetheramine aqueous solution is 0.5%-1%.

7. The corrosion-resistant cutting fluid according to claim 1, characterized in that, The preparation method of the epoxidized soybean oil modified borate ester is as follows: diethanolamine borate ester and epoxidized soybean oil are mixed evenly, nitrogen gas is introduced to purge the air, the temperature is raised to 110℃-120℃, the stirring speed is controlled at 300rpm-500rpm, and the reaction is carried out for 3h-5h to obtain epoxidized soybean oil modified borate ester.

8. The corrosion-resistant cutting fluid according to claim 7, characterized in that, The mass ratio of diethanolamine borate ester to epoxidized soybean oil is 10:7-11.

9. The corrosion-resistant cutting fluid according to claim 7, characterized in that, The antibacterial agent is at least one of polyhexamethylene biguanide, benzisothiazolinone, and chloromethylisothiazolinone; the defoamer is at least one of polydimethylsiloxane and polyoxypropylene glycerol ether.

10. A method for preparing a corrosion-resistant cutting fluid according to any one of claims 1-9, characterized in that, The preparation steps include the following: A composite dispersion of naphthenic base oil, paraffinic base oil, modified soybean oil borate, fatty alcohol polyoxyethylene ether, monoethanolamine, triethanolamine, defoamer, dodecanoic acid, phosphate ester, and modified graphene oxide was mixed evenly and heated to 55℃-60℃. The stirring speed was controlled at 100rpm-200rpm. Calcium phytate was added, and the temperature was controlled at 60℃-65℃ during the addition of calcium phytate. After the addition of calcium phytate was completed, the temperature was cooled to 40℃-45℃, lauroyl sarcosine was added, and the mixture was stirred for 10min-15min. The temperature was then cooled to 20℃-30℃, an antibacterial agent was added, and the mixture was stirred for 20min-40min. The mixture was then filtered and bottled to obtain a corrosion-resistant cutting fluid.

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