Metal cutting oil and preparation method thereof

Abstract

The invention relates to metal cutting oil and a preparation method thereof. The metal cutting oil is prepared from the following raw materials in parts by weight: 66-85wt% of base oil, 4-15wt% of lubricating grease, 0.3-1wt% of an antioxidant, 1-5wt% of an extreme pressure agent, 0.5-1.5 wt% of a metal corrosion inhibitor, 0.5-1wt% of a coupling agent and 10-20wt% of a functional additive, wherein the functional additive is a core-shell structure particle of which the core contains perfluorohexanone and the shell contains modified silicon dioxide. The core-shell structure particles are prepared through an emulsion method, the core-shell structure particles with the adjustable size can be obtained by controlling corresponding parameters and proportions, a functional auxiliary agent with the appropriate size can be prepared, oil mist is inhibited, the lubricating performance is improved, the situation that a filtering system is affected by too large particle size is avoided, and due to high temperature and friction in the cutting process, the particle size is not too large. The perfluorohexanone is slowly released, the cutting oil has a continuous oil mist inhibition effect, and the service life of the cutting oil is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of metal processing oils, and in particular relates to metal cutting oil and a preparation method thereof. Background Art

[0002] Metal cutting fluid refers to lubricants used in various processing processes such as cutting, milling, stamping, rolling and drawing of metals and alloys. Cutting fluids should have good cooling performance, lubrication performance, rust prevention performance, oil removal and cleaning function, anti-corrosion function and easy dilution characteristics. Cutting fluids are mainly divided into two categories: oil-based metal cutting fluids and water-based metal cutting fluids. Among them, oil-based cutting fluids are made of oil compounds (mineral oil, vegetable oil), added with oily rust inhibitors and other oily additives including extreme pressure agents containing chlorine, phosphorus and sulfur; its advantages are excellent lubricity and rust prevention, but the cooling effect is extremely poor, and it is easy to produce oil mist, oil smoke, and even cause fire. Because water has a large specific heat, high thermal conductivity, and large heat of vaporization in water-based metal cutting fluids, water-based cutting fluids have excellent cooling performance, low cost, and are relatively convenient to clean after processing.

[0003] Although water-based cutting fluid has good cooling performance and is easy to clean, cutting oil is still more often used as a cutting medium in metal deep hole drilling, thread processing, grinding, broaching, boring, high-precision turning, high-precision milling and honing, which require high precision or processing difficulty. However, high-precision processing has high temperatures, and while cutting oil needs to have good lubrication performance, it also needs to reduce its friction coefficient on the processing surface. At the same time, due to high processing precision and high temperature, more oil mist is generated, and reducing oil mist is also an urgent problem to be solved. Therefore, preparing a cutting oil with both low oil mist and low friction coefficient is an urgent problem to be solved in the industry. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a metal cutting oil containing a composite functional additive and a preparation method thereof. The purpose of the present invention is to reduce oil mist while improving lubrication performance, thereby improving the performance of the cutting oil as a whole.

[0005] The first aspect of the present invention provides a metal cutting oil, which is prepared from the following raw materials in parts by weight:

[0006] Base oil: 66-85wt%,

[0007] Grease: 4-15wt%,

[0008] Antioxidant: 0.3-1wt%,

[0009] Extreme pressure agent: 1-5wt%,

[0010] Metal corrosion inhibitor: 0.5-1wt%,

[0011] Coupling agent: 0.5-1wt%,

[0012] and 10-20wt% of functional additives;

[0013] As a further preferred embodiment, the functional auxiliary agent is a core-shell structured particle, the core of the core-shell structured particle comprises perfluorohexanone, and the shell of the core-shell structured particle comprises modified silica.

[0014] As a further preferred embodiment, the particle size of the core-shell structured particles is in the range of 1-10 μm, and the D50 of the core-shell structured particles is in the range of 3-8 μm. Further preferably, the particle size of the core-shell structured particles is in the range of 3-9 μm, and the D50 of the core-shell structured particles is in the range of 6-8 μm.

[0015] As a further preferred embodiment, the base oil includes at least one of mineral oil, hydrogenated oil or synthetic oil.

[0016] As a further preferred embodiment, the grease includes at least one of tall oil, hydrogenated palm oil, oxidized rapeseed oil, tetrapolycastor oil, isopropyl palmitate, diisotridecyl adipate, bis(2-ethylhexyl sebacate) and 2-ethylhexyl oleate.

[0017] As a further preferred embodiment, the extreme pressure agent includes at least one of chlorinated paraffin, sulfurized fatty acid ester, sulfurized triglyceride, phosphate ester, phosphite, polyester and polyether.

[0018] As a further preferred embodiment, the antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol, alkyl diphenylamine or di[3,5-di-(1,1-dimethylethyl)-4-hydroxy-]phenylpropionic acid thiodiglycol ester.

[0019] As a further preferred embodiment, the metal corrosion inhibitor includes at least one of benzotriazole and its derivatives or imidazole derivatives.

[0020] As a further preferred embodiment, the coupling agent includes at least one of isomeric tridecanol, isomeric tetradecanol, C14-C16 Guerbet alcohol, isohexanediol, diethylene glycol monobutyl ether and dipropylene glycol monobutyl ether.

[0021] As a further preferred embodiment, the method for preparing the core-shell structured particles comprises the following steps:

[0022] Step 1, prepare a surfactant solution with a concentration of 0.1-0.5wt%, add perfluorohexanone to the surfactant solution, and stir magnetically for 35-60min at a speed of 1500-2500rpm to form a stable W / O emulsion; wherein the concentration of the surfactant solution can optionally be 0.1wt%, 0.15wt%, 0.2wt%, 0.25wt%, 0.3wt%, 0.35wt%, 0.4wt%, 0.45wt%, 0.5wt%; the magnetic stirring can optionally be 35min, 40min, 45min, 50min, 55min, 60min; the speed of the magnetic stirring is 1500rpm, 1550rpm, 1600rpm, 1650rpm, 1700rpm, 1750rpm, 1800rpm, 1850rpm, 1900rpm, 1950rpm, 2000rpm, 2050rpm, 2100rpm, 2150rpm, 2200rpm, 2250rpm, 2300rpm, 2350rpm, 2400rpm, 2450rpm, 2500rpm.

[0023] Step 2, under the temperature condition of 25-35°C, a certain amount of 0.1M ammonia water is added to the W / O emulsion, and magnetic stirring is performed for 10 minutes at a magnetic stirring speed of 500-1000rpm. The magnetic stirring at a stirring speed of 500-1000rpm is continued, and a certain amount of tetraethyl orthosilicate is added dropwise to the W / O emulsion to which the ammonia water is added, and the dropping time is controlled to be 20-40min. After the dropwise addition is completed, the magnetic stirring at a stirring speed of 500-1000rpm is continued for at least 120min, so that the tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and a silica shell is formed; preferably, the stirring speed in step 2 can be independently selected as 500rpm, 550rpm, 600rpm, 650rpm, 700rpm, 750rpm, 800rpm, 850rpm, 900rpm, 950rpm, 1000rpm.

[0024] Step three, centrifuge the W / O emulsion after the reaction in the step at a speed of 2500-3500rpm for 10min, collect the precipitated solid particles, wash the solid particles with deionized water and ethanol several times respectively to remove residual organic solvent and surfactant; dry the washed solid particles in a vacuum drying oven; the speed of the magnetic stirring can be selected to be 2500rpm, 2550rpm, 2600rpm, 2650rpm, 2700rpm, 2750rpm, 2800rpm, 2850rpm, 2900rpm, 2950rpm, 3000rpm, 3050rpm, 3100rpm, 3150rpm, 3200rpm, 3250rpm, 3300rpm, 3350rpm, 3400rpm, 3450rpm, 3500rpm.

[0025] Step 4: dispersing the dried solid particles in an organic solvent containing a silanization agent to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0026] As a further preferred embodiment, the volume ratio of perfluorohexanone: surfactant solution: ammonia water: tetraethyl orthosilicate is 10:50:1:1.

[0027] As a further preferred embodiment, the surfactant includes cetyltrimethylammonium bromide (CTAB) or polyvinyl alcohol (PVA).

[0028] As a further preferred embodiment, the silanization agent in step 5 is hexadecyltrimethoxysilane (CTMS) or dodecyltrimethoxysilane (DTMS).

[0029] As a further preferred embodiment, the surface modification treatment time is 1-2 hours.

[0030] A second aspect of the present invention provides a method for preparing metal cutting oil, comprising the following steps:

[0031] Step 1: prepare a surfactant solution with a concentration of 0.1-0.5 wt%, add perfluorohexanone to the surfactant solution, and stir magnetically for 35-60 minutes at a speed of 1500-2500 rpm to form a stable W / O emulsion.

[0032] Step 2: Under a temperature condition of 25-35°C, a certain amount of 0.1M ammonia water is added to the W / O emulsion, and magnetic stirring is performed for 10 minutes at a stirring speed of 500-1000rpm. The magnetic stirring at a stirring speed of 500-1000rpm is continued, and a certain amount of tetraethyl orthosilicate is added dropwise to the W / O emulsion to which the ammonia water is added, and the dropping time is controlled to be 20-40min. After the dropwise addition is completed, the magnetic stirring at a stirring speed of 500-1000rpm is continued for at least 120min, so that the tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and a silica shell is formed.

[0033] Step 3: centrifuge the W / O emulsion after the reaction at 2500-3500 rpm for 10 min, collect the precipitated solid particles, wash the solid particles with deionized water and ethanol several times respectively to remove residual organic solvent and surfactant; dry the washed solid particles in a vacuum drying oven.

[0034] Step 4: dispersing the dried solid particles in an organic solvent containing a silanization agent to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0035] Step 5, weighing the raw materials according to the mass percentage of claim 1, adding the base oil and grease into a container and mixing evenly, heating to 30-50° C., adding an antioxidant, an extreme pressure agent and a metal corrosion inhibitor, and magnetically stirring for 100-260 minutes to obtain a mixed solution;

[0036] Step 6: Add the functional additive and coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0037] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0038] 1. The present invention introduces functional additives into cutting oil, wherein the functional additives include core-shell structure particles with perfluorohexanone as the core and modified silica as the shell; perfluorohexanone is an environmentally friendly and pollution-free material. Due to its low vaporization temperature, the core-shell structure particles on the contact surface processed by the cutting oil will vaporize and gradually break the modified silica shell under the action of silica heat conduction. At the same time, the friction on the contact surface also promotes the rupture of the shell, and finally releases perfluorohexanone on the contact surface, which has a good cooling effect. After the temperature is reduced, the oil mist will also be significantly reduced. At the same time, since the shell structure is modified silica, before the shell is broken, the core-shell structure particles as a whole play a lubricating role, effectively protecting the tool and the workpiece surface. With the increase of temperature and the dual effects of friction, the modified silica particles after the core-shell structure is broken can provide effective rolling friction and always maintain a good lubrication effect.

[0039] 2. The size of the core-shell structure particles is limited to 1-10 μm by adjusting the surfactant concentration in step 1 of preparing the core-shell structure particles to 0.1-0.5 wt% and controlling the magnetic stirring speed to 1500-2500 rpm. If the surfactant concentration is too high or the stirring speed is too high, the core-shell structure particles will be too small, and too little perfluorohexanone will be contained, which will cause the core-shell structure particles to be unable to reduce the temperature well. If the surfactant concentration is too low or the stirring speed is too low, it can be ensured that the cutting oil does not affect the filtration system due to the large size of the core-shell structure particles.

[0040] 3. During the use of cutting oil, the core-shell structure particles of the functional additives in the cutting oil that are not in contact with the cutting contact surface or far away from the contact surface are not subjected to high temperature and friction extrusion. When used next time, these unbroken core-shell structure particles will also break when they encounter the cutting contact surface extrusion and contact with high temperature, absorbing heat to reduce the temperature and reduce the oil mist. This plays a role in the slow release of oil mist inhibitors to a certain extent, and prolongs the service life of the cutting oil to a certain extent. DETAILED DESCRIPTION

[0041] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention are further described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] It should be noted that the terms "include" and "have" in the embodiments of the present invention and any variations thereof are intended to cover non-exclusive inclusions.

[0043] Example 1

[0044] Step 1: prepare 500 mL of 0.1 wt% hexadecyltrimethylammonium bromide solution, add 100 mL of perfluorohexanone into the hexadecyltrimethylammonium bromide solution, and stir magnetically for 35 minutes at a speed of 1500 rpm to form a stable W / O emulsion.

[0045] Step 2: At a temperature of 25-35°C, add 10 mL of 0.1 M ammonia water to the W / O emulsion, stir magnetically for 10 min at a stirring speed of 800 rpm, continue to maintain the magnetic stirring at a stirring speed of 800 rpm, and add 10 mL of tetraethyl orthosilicate dropwise to the W / O emulsion to which the ammonia water was added, control the dropping time to be 20 min, and continue to maintain the magnetic stirring at a stirring speed of 800 rpm for 120 min after the dropping is completed, so that tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and forms a silica shell.

[0046] Step 3: Centrifuge the W / O emulsion after the reaction in step 2 at a speed of 2500 rpm for 10 minutes, collect the precipitated solid particles, and wash the solid particles with deionized water and ethanol for several times respectively to remove residual organic solvent and surfactant; dry the washed solid particles in a vacuum drying oven.

[0047] Step 4: Dispersing the dried solid particles in an organic solvent containing hexadecyltrimethoxysilane to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0048] Step 5: Weigh the following components according to the mass ratio:

[0049] Base oil: mineral oil, mass 76g,

[0050] Grease: Hydrogenated palm oil, mass 9g,

[0051] Antioxidant: alkyl diphenylamine, mass 0.5g,

[0052] Extreme pressure agent: sulfurized triglyceride, mass 3g,

[0053] Metal corrosion inhibitor: benzotriazole, mass 0.7g,

[0054] Coupling agent: isomeric tetradecanol, mass 0.8g,

[0055] And the mass of the functional additive is 10g;

[0056] Add the base oil and grease into a container and mix them evenly, then heat to 30-50° C., add antioxidant, extreme pressure agent and metal corrosion inhibitor, and stir magnetically for 100-260 minutes to obtain a mixed solution;

[0057] Step 6: Add the functional additive and coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0058] Example 2

[0059] Step 1: prepare 500 mL of 0.1 wt% hexadecyltrimethylammonium bromide solution, add 100 mL of perfluorohexanone into the hexadecyltrimethylammonium bromide solution, and stir magnetically for 35 minutes at a speed of 1500 rpm to form a stable W / O emulsion.

[0060] Step 2: At a temperature of 25-35°C, add 10 mL of 0.1 M ammonia water to the W / O emulsion, stir magnetically for 10 min at a stirring speed of 800 rpm, continue to maintain the magnetic stirring at a stirring speed of 800 rpm, and add 10 mL of tetraethyl orthosilicate dropwise to the W / O emulsion to which the ammonia water was added, control the dropping time to be 20 min, and continue to maintain the magnetic stirring at a stirring speed of 800 rpm for 120 min after the dropping is completed, so that tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and forms a silica shell.

[0061] Step 3: Centrifuge the W / O emulsion after the reaction in step 2 at a speed of 2500 rpm for 10 minutes, collect the precipitated solid particles, and wash the solid particles with deionized water and ethanol for several times respectively to remove residual organic solvent and surfactant; dry the washed solid particles in a vacuum drying oven.

[0062] Step 4: Dispersing the dried solid particles in an organic solvent containing hexadecyltrimethoxysilane to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0063] Step 5: Weigh the following components according to the mass ratio:

[0064] Base oil: mineral oil, mass 72g,

[0065] Grease: Hydrogenated palm oil, mass 8g,

[0066] Antioxidant: alkyl diphenylamine, mass 0.5g,

[0067] Extreme pressure agent: sulfurized triglyceride, mass 3g,

[0068] Metal corrosion inhibitor: benzotriazole, mass 0.7g,

[0069] Coupling agent: isomeric tetradecanol, mass 0.8g,

[0070] And the mass of the functional additive is 15g;

[0071] Add the base oil and grease into a container and mix them evenly, then heat to 30-50° C., add antioxidant, extreme pressure agent and metal corrosion inhibitor, and stir magnetically for 100-260 minutes to obtain a mixed solution;

[0072] Step 6: Add the functional additive and coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0073] Example 3

[0074] Step 1: prepare 500 mL of 0.1 wt% hexadecyltrimethylammonium bromide solution, add 100 mL of perfluorohexanone into the hexadecyltrimethylammonium bromide solution, and stir magnetically for 35 minutes at a speed of 1500 rpm to form a stable W / O emulsion.

[0075] Step 2: At a temperature of 25-35°C, add 10 mL of 0.1 M ammonia water to the W / O emulsion, stir magnetically for 10 min at a stirring speed of 800 rpm, continue to maintain the magnetic stirring at a stirring speed of 800 rpm, and add 10 mL of tetraethyl orthosilicate dropwise to the W / O emulsion to which the ammonia water was added, control the dropping time to be 20 min, and continue to maintain the magnetic stirring at a stirring speed of 800 rpm for 120 min after the dropping is completed, so that tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and forms a silica shell.

[0076] Step 3: Centrifuge the W / O emulsion after the reaction in step 2 at a speed of 2500 rpm for 10 minutes, collect the precipitated solid particles, and wash the solid particles with deionized water and ethanol for several times respectively to remove residual organic solvent and surfactant; dry the washed solid particles in a vacuum drying oven.

[0077] Step 4: Dispersing the dried solid particles in an organic solvent containing hexadecyltrimethoxysilane to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0078] Step 5: Weigh the following components according to the mass ratio:

[0079] Base oil: mineral oil, mass 68g,

[0080] Grease: Hydrogenated palm oil, mass 6.8g,

[0081] Antioxidant: alkyl diphenylamine, mass 0.5g,

[0082] Extreme pressure agent: sulfurized triglyceride, mass 3g,

[0083] Metal corrosion inhibitor: benzotriazole, mass 0.7g,

[0084] Coupling agent: isomeric tetradecanol, mass 1g,

[0085] And the mass of the functional additive is 20g;

[0086] Add the base oil and grease into a container and mix them evenly, then heat to 30-50° C., add antioxidant, extreme pressure agent and metal corrosion inhibitor, and stir magnetically for 100-260 minutes to obtain a mixed solution;

[0087] Step 6: Add the functional additive and coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0088] Example 4

[0089] Step 1: prepare 500 mL of 0.5 wt% hexadecyltrimethylammonium bromide solution, add 100 mL of perfluorohexanone into the hexadecyltrimethylammonium bromide solution, and stir magnetically for 60 min at a speed of 2500 rpm to form a stable W / O emulsion.

[0090] Step 2: At a temperature of 25-35°C, add 10 mL of 0.1 M ammonia water to the W / O emulsion, stir magnetically for 10 min at a stirring speed of 800 rpm, continue to maintain the magnetic stirring at a stirring speed of 800 rpm, and add 10 mL of tetraethyl orthosilicate dropwise to the W / O emulsion to which the ammonia water was added, control the dropping time to be 20 min, and continue to maintain the magnetic stirring at a stirring speed of 800 rpm for 120 min after the dropping is completed, so that tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and forms a silica shell.

[0091] Step 3: Centrifuge the W / O emulsion after the reaction in step 2 at a speed of 2500 rpm for 10 minutes, collect the precipitated solid particles, and wash the solid particles with deionized water and ethanol for several times respectively to remove residual organic solvent and surfactant; dry the washed solid particles in a vacuum drying oven.

[0092] Step 4: dispersing the dried solid particles in an organic solvent containing a silanization agent to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0093] Step 5: Weigh the following components according to the mass ratio:

[0094] Base oil: mineral oil, mass 72g,

[0095] Grease: Hydrogenated palm oil, mass 8g,

[0096] Antioxidant: alkyl diphenylamine, mass 0.5g,

[0097] Extreme pressure agent: sulfurized triglyceride, mass 3g,

[0098] Metal corrosion inhibitor: benzotriazole, mass 0.7g,

[0099] Coupling agent: isomeric tetradecanol, mass 0.8g,

[0100] And the mass of the functional additive is 15g;

[0101] Add the base oil and grease into a container and mix them evenly, then heat to 30-50° C., add antioxidant, extreme pressure agent and metal corrosion inhibitor, and stir magnetically for 100-260 minutes to obtain a mixed solution;

[0102] Step 6: Add the functional additive and coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0103] Example 5

[0104] Step 1: prepare 500 mL of 0.3 wt% hexadecyltrimethylammonium bromide solution, add 100 mL of perfluorohexanone into the hexadecyltrimethylammonium bromide solution, and stir magnetically for 45 min at a speed of 2000 rpm to form a stable W / O emulsion.

[0105] Step 2: At a temperature of 25-35°C, add 10 mL of 0.1 M ammonia water to the W / O emulsion, stir magnetically for 10 min at a stirring speed of 700 rpm, continue to maintain the magnetic stirring at a stirring speed of 700 rpm, and add 10 mL of tetraethyl orthosilicate dropwise to the W / O emulsion to which the ammonia water was added, control the dropping time to 20 min, and continue to maintain the magnetic stirring at a stirring speed of 700 rpm for 150 min after the dropping is completed, so that the tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and forms a silica shell.

[0106] Step 3: Centrifuge the W / O emulsion after the reaction in step 2 at a speed of 2500 rpm for 10 minutes, collect the precipitated solid particles, and wash the solid particles with deionized water and ethanol for several times respectively to remove residual organic solvent and surfactant; dry the washed solid particles in a vacuum drying oven.

[0107] Step 4: Dispersing the dried solid particles in an organic solvent containing dodecyltrimethoxysilane to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0108] Step 5: Weigh the following components according to the mass ratio:

[0109] Base oil: mineral oil, mass 72g,

[0110] Grease: Hydrogenated palm oil, mass 8g,

[0111] Antioxidant: alkyl diphenylamine, mass 0.5g,

[0112] Extreme pressure agent: sulfurized triglyceride, mass 3g,

[0113] Metal corrosion inhibitor: benzotriazole, mass 0.7g,

[0114] Coupling agent: isomeric tetradecanol, mass 0.8g,

[0115] And the mass of the functional additive is 15g;

[0116] Add the base oil and grease into a container and mix them evenly, then heat to 30-50° C., add antioxidant, extreme pressure agent and metal corrosion inhibitor, and stir magnetically for 100-260 minutes to obtain a mixed solution;

[0117] Step 6: Add the functional additive and coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0118] Example 6

[0119] Step 1: prepare 500 mL of 0.3 wt% hexadecyltrimethylammonium bromide solution, add 100 mL of perfluorohexanone into the hexadecyltrimethylammonium bromide solution, and stir magnetically for 45 min at a speed of 2000 rpm to form a stable W / O emulsion.

[0120] Step 2: At a temperature of 25-35°C, add 10 mL of 0.1 M ammonia water to the W / O emulsion, stir magnetically for 10 min at a stirring speed of 500 rpm, continue to maintain the magnetic stirring at a stirring speed of 500 rpm, and add 10 mL of tetraethyl orthosilicate dropwise to the W / O emulsion to which the ammonia water was added, control the dropping time to be 20 min, and continue to maintain the magnetic stirring at a stirring speed of 500 rpm for 120 min after the dropping is completed, so that tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and forms a silica shell.

[0121] Step 3: Centrifuge the W / O emulsion after the reaction in step 2 at a speed of 2500 rpm for 10 minutes, collect the precipitated solid particles, and wash the solid particles with deionized water and ethanol for several times respectively to remove residual organic solvent and surfactant; dry the washed solid particles in a vacuum drying oven.

[0122] Step 4: dispersing the dried solid particles in an organic solvent containing a silanization agent to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0123] Step 5: Weigh the following components according to the mass ratio:

[0124] Base oil: mineral oil, mass 72g,

[0125] Grease: Hydrogenated palm oil, mass 8g,

[0126] Antioxidant: alkyl diphenylamine, mass 0.5g,

[0127] Extreme pressure agent: sulfurized triglyceride, mass 3g,

[0128] Metal corrosion inhibitor: benzotriazole, mass 0.7g,

[0129] Coupling agent: isomeric tetradecanol, mass 0.8g,

[0130] And the mass of the functional additive is 15g;

[0131] Add the base oil and grease into a container and mix them evenly, then heat to 30-50° C., add antioxidant, extreme pressure agent and metal corrosion inhibitor, and stir magnetically for 100-260 minutes to obtain a mixed solution;

[0132] Step 6: Add the functional additive and coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0133] Example 7

[0134] Step 1: prepare 500 mL of a polyvinyl alcohol solution with a concentration of 0.3 wt%, add 100 mL of perfluorohexanone to the hexadecyltrimethylammonium bromide solution, and stir magnetically for 45 minutes at a speed of 2000 rpm to form a stable W / O emulsion.

[0135] Step 2: At a temperature of 25-35°C, add 10 mL of 0.1 M ammonia water to the W / O emulsion, stir magnetically for 10 min at a stirring speed of 500 rpm, continue to maintain the magnetic stirring at a stirring speed of 500 rpm, and add 10 mL of tetraethyl orthosilicate dropwise to the W / O emulsion to which the ammonia water was added, control the dropping time to 20 min, and continue to maintain the magnetic stirring at a stirring speed of 500 rpm for 200 min after the dropping is completed, so that the tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and forms a silica shell.

[0136] Step 3: Centrifuge the W / O emulsion after the reaction in step 2 at a speed of 2500 rpm for 10 minutes, collect the precipitated solid particles, and wash the solid particles with deionized water and ethanol for several times respectively to remove residual organic solvent and surfactant; dry the washed solid particles in a vacuum drying oven.

[0137] Step 4: Dispersing the dried solid particles in an organic solvent containing dodecyltrimethoxysilane to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0138] Step 5: Weigh the following components according to the mass ratio:

[0139] Base oil: synthetic oil, mass 72g,

[0140] Grease: tetrapoly castor oil, mass 8g,

[0141] Antioxidant: 2,6-di-tert-butyl-p-cresol, mass 0.5g,

[0142] Extreme pressure agent: phosphate ester, mass 3g,

[0143] Metal corrosion inhibitor: benzotriazole, mass 0.7g,

[0144] Coupling agent: isomeric tridecanol, mass 0.8g,

[0145] And the mass of the functional additive is 15g;

[0146] Add the base oil and grease into a container and mix them evenly, then heat to 30-50° C., add antioxidant, extreme pressure agent and metal corrosion inhibitor, and stir magnetically for 100-260 minutes to obtain a mixed solution;

[0147] Step 6: Add the functional additive and coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0148] Comparative Example 1

[0149] Step 1: Dispersing the dried solid particles in an organic solvent containing a silanization agent to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

[0150] Step 2: Weigh the following components according to the mass ratio:

[0151] Base oil: mineral oil, mass 72g,

[0152] Grease: Hydrogenated palm oil, mass 8g,

[0153] Antioxidant: alkyl diphenylamine, mass 0.5g,

[0154] Extreme pressure agent: sulfurized triglyceride, mass 3g,

[0155] Metal corrosion inhibitor: benzotriazole, mass 0.7g,

[0156] Coupling agent: isomeric tetradecanol, mass 0.8g,

[0157] and 15 g of modified silicon dioxide;

[0158] Add the base oil and grease into a container and mix them evenly, then heat to 30-50° C., add antioxidant, extreme pressure agent and metal corrosion inhibitor, and stir magnetically for 100-260 minutes to obtain a mixed solution;

[0159] Step 6: Add the modified silica and the coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0160] Comparative Example 2

[0161] Step 1: Weigh the following components according to the mass ratio:

[0162] Base oil: mineral oil, mass 72g,

[0163] Grease: Hydrogenated palm oil, mass 8g,

[0164] Antioxidant: alkyl diphenylamine, mass 0.5g,

[0165] Extreme pressure agent: sulfurized triglyceride, mass 3g,

[0166] Metal corrosion inhibitor: benzotriazole, mass 0.7g,

[0167] Coupling agent: isomeric tetradecanol, mass 0.8g;

[0168] Add the base oil and grease into a container and mix them evenly, then heat to 30-50° C., add antioxidant, extreme pressure agent and metal corrosion inhibitor, and stir magnetically for 100-260 minutes to obtain a mixed solution;

[0169] Step 6: Add the coupling agent into the mixed solution, heat it to below 40° C., and stir it with magnetic force for 15-35 minutes to obtain the metal cutting oil.

[0170] The above examples 1-7 all obtained transparent and uniform liquid cutting oils. The particle size range and D 50 The cutting oils of Examples 1-7 and Comparative Example 1 in the examples were used to process a titanium alloy workpiece, and the results are shown in Table 1.

[0171] Table 1 Actual processing conditions of alloy parts in Examples 1-7 and Comparative Examples 1-2

[0172]

[0173] According to Table 1, the oil mist of all the examples is low, which shows that the addition of functional additives helps to reduce the oil mist. Comparative Examples 1-3 show that for functional additives of the same size, the greater the amount added to the cutting oil, the longer the service life of the tool. This is because more core-shell structure particles can continue to gradually break and release perfluorohexanone in subsequent multiple workpiece processing to reduce the temperature, which reduces the oil mist on the one hand and prolongs the life of the cutting oil on the other hand. Comparative Examples 2, 4, and 5 show that with the increase in the amount of surfactant used to prepare the core-shell structured particles, the increase in the emulsification time, and the increase in the stirring speed, the particle size range of the core-shell structured particles and D 50 The preparation method can well control the size of the core-shell structure particles. By comparing Examples 1-7 with Comparative Example 1, it can be seen that only adding silicon dioxide as a functional additive can improve the lubrication performance and the qualified rate of the workpiece, but due to the lack of the good oil mist suppression effect of the perfluorohexanone core structure, the service life of the props is short, and when no functional additive is added, both the oil mist suppression and lubrication performance are lower than those of the examples.

[0174] The above is a detailed introduction to a metal cutting oil and a preparation method thereof disclosed in an embodiment of the present invention. The above content is a further detailed description of the present invention in combination with a specific preferred embodiment, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, its architecture can be flexible and can derive a series of products. Just making a few simple deductions or substitutions should be regarded as belonging to the scope of patent protection of the present invention determined by the submitted claims.

Claims

1. A metal cutting oil, characterized in that: The metal cutting oil is prepared from the following raw materials in parts by weight: Base oil: 66-85wt%, Grease: 4-15wt%, Antioxidant: 0.3-1wt%, Extreme pressure agent: 1-5wt%, Metal corrosion inhibitor: 0.5-1.5wt%, Coupling agent: 0.5-1wt%, and 10-20wt% of functional additives; The functional auxiliary agent is a core-shell structured particle, the core of the core-shell structured particle comprises perfluorohexanone, and the shell of the core-shell structured particle comprises modified silicon dioxide.

2. The metal cutting oil according to claim 1, characterized in that: The particle size range of the core-shell structure particles is 1-10 μm, and the D 50 The range is 3-8μm.

3. The metal cutting oil according to claim 2, characterized in that: The base oil comprises at least one of mineral oil, hydrogenated oil or synthetic oil, The lubricating grease comprises at least one of tall oil, hydrogenated palm oil, oxidized rapeseed oil, tetrapolymerized castor oil, isopropyl palmitate, diisotridecyl adipate, bis(2-ethylhexyl sebacate) and 2-ethylhexyl oleate.

4. The metal cutting oil according to claim 2, characterized in that: The extreme pressure agent includes at least one of chlorinated paraffin, sulfurized fatty acid ester, sulfurized triglyceride, phosphate ester, phosphite, polyester and polyether.

5. The metal cutting oil according to claim 2, characterized in that: The antioxidant comprises at least one of 2,6-di-tert-butyl-p-cresol, alkyl diphenylamine or di[3,5-di-(1,1-dimethylethyl)-4-hydroxy-]phenylpropionic acid thiodiglycol ester, The metal corrosion inhibitor includes at least one of benzotriazole and its derivatives or imidazole derivatives. The coupling agent includes at least one of isomeric tridecanol, isomeric tetradecanol, C14-C16 Guerbet alcohol, isohexanediol, diethylene glycol monobutyl ether and dipropylene glycol monobutyl ether.

6. The metal cutting oil according to any one of claims 1 to 5, characterized in that: The method for preparing the core-shell structured particles comprises the following steps: Step 1, preparing a surfactant solution with a concentration of 0.1-0.5wt%, adding perfluorohexanone to the surfactant solution, and magnetically stirring for 35-60min at a speed of 1500-2500rpm to form a stable W / O emulsion; Step 2: Add a certain amount of 0.1M ammonia water to the W / O emulsion at a temperature of 25-35°C, stir magnetically for 10 minutes at a stirring speed of 500-1000rpm, continue to maintain the magnetic stirring at a stirring speed of 500-1000rpm, and drop a certain amount of tetraethyl orthosilicate into the W / O emulsion to which the ammonia water is added, control the dropping time to be 20-40min, and continue to maintain the magnetic stirring at a stirring speed of 500-1000rpm for at least 120min after the dropwise addition is completed, so that the tetraethyl orthosilicate is hydrolyzed on the surface of the emulsion droplets of the W / O emulsion and forms a silica shell layer; Step 3, centrifuging the W / O emulsion after the reaction at 2500-3500 rpm for 10 min, collecting the precipitated solid particles, washing the solid particles with deionized water and ethanol for several times respectively to remove the residual organic solvent and surfactant; drying the washed solid particles in a vacuum drying oven; Step 4: dispersing the dried solid particles in an organic solvent containing a silanization agent to perform surface modification treatment, and washing and drying the modified solid particles again to obtain the core-shell structured particles.

7. The metal cutting oil according to claim 6, characterized in that Calculated by volume ratio, the perfluorohexanone: the surfactant solution: ammonia water: ethyl orthosilicate = 10:50:1:

1.

8. The metal cutting oil according to claim 6, characterized in that: The surfactant includes cetyltrimethylammonium bromide (CTAB) or polyvinyl alcohol (PVA).

9. The metal cutting oil according to any one of claim 6, characterized in that: The silanization agent in step 4 is hexadecyltrimethoxysilane (CTMS) or dodecyltrimethoxysilane (DTMS), and the surface modification treatment time is 1-2 hours.

10. A method for preparing a metal cutting oil according to any one of claims 6 to 9, characterized in that: The following steps are involved: Step 5, weighing the raw materials according to the mass percentage of claim 1, adding the base oil and grease into a container and mixing evenly, heating to 30-50° C., adding an antioxidant, an extreme pressure agent and a metal corrosion inhibitor, and magnetically stirring for 100-260 minutes to obtain a mixed solution; Step 6: Add the functional additive and coupling agent into the mixed solution, heat to below 40° C., and stir with magnetic force for 15-35 minutes to obtain the metal cutting oil.

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