Metal processing lubricating oil and preparation method thereof

Abstract

The invention relates to the technical field of metal processing preparations, and discloses metal processing lubricating oil and a preparation method thereof, the lubricating oil comprises the following components by weight: 5-12% of an organosilicon lubricant, 2-4% of an antirust agent, 15-25% of an oiliness agent, 0.2-0.5% of an antioxidant, 0.1-0.2% of a corrosion inhibitor, and the balance of base oil; the preparation method comprises the following steps: adding the organic silicon lubricant, the oiliness agent, the antirust agent, the antioxidant and the corrosion inhibitor into the base oil at the temperature of 55-60 DEG C while stirring until the components are completely dissolved, thereby obtaining the lubricating oil. The metal processing lubricating oil solves the problems that the existing metal processing lubricating oil is strong in smell, difficult to clean and easy to cause surface corrosion of workpieces.

Description

Technical Field

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

[0002] Lubricating oil is a lubricating medium used to reduce the friction resistance of the friction pair and slow down its wear. In mechanical processing, it can reduce the friction between the processing surface and the tool surface, and at the same time reduce the friction resistance of the sliding surface, making the workpiece less likely to be roughened or broken during high-speed and high-pressure processing.

[0003] Currently, most metal processing lubricants on the market contain chlorine and other extreme pressure agents. Such lubricants have a strong odor during processing, and the surface of the workpiece is difficult to clean after processing. The generated cleaning water is difficult to handle, which puts great pressure on the environment. In addition, chlorine-containing lubricating ingredients are prone to overflowing chloride ions during high-intensity processing projects, causing problems such as rust on the surface of the workpiece. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a metal processing lubricant and a preparation method thereof, so as to solve the problems that the existing metal processing lubricant has a strong odor, is difficult to clean and easily causes rust on the workpiece surface.

[0005] The present invention solves the above technical problems by the following technical means:

[0006] In a first aspect, the present invention discloses a metal processing lubricant, which comprises the following components by weight percentage: 5-12% of a silicone lubricant, 2-4% of a rust inhibitor, 15-25% of an oiliness agent, 0.2-0.5% of an antioxidant, 0.1-0.2% of a corrosion inhibitor, and the remainder is base oil.

[0007] Furthermore, the organosilicon lubricant comprises the following components in parts by weight: 50 to 100 parts of raw material A, 50 to 100 parts of raw material B, 25 to 50 parts of isobutyl alcohol, 100 to 150 parts of reaction medium and 5 to 8 parts of catalyst;

[0008] The raw material A is one or a combination of tetrabutyl ketoxime silane, methyl tributyl ketoxime silane, and dimethyl dibutyl ketoxime silane; the raw material B is one or a combination of hydroxy silicone oil, amino silicone oil, dimethyl silicone oil, and ethyl silicone oil; the reaction medium is one or a combination of D60 base oil, D80 base oil, D100 base oil, and C12-C16 isomeric alkanol; the raw material of the catalyst is selected from one or a combination of methacryloxypropyl methyldiethoxysilane, 3-methacryloxypropyl methyldimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-ureapropyltrimethoxysilane, and cyclohexylaminopropyltrimethoxysilane.

[0009] Furthermore, the organosilicon lubricant comprises the following components in parts by weight: 60 parts of raw material A, 60 parts of raw material B, 30 parts of isobutyl alcohol, 120 parts of reaction medium and 6 parts of catalyst.

[0010] Furthermore, the preparation method of the organosilicon lubricant comprises the following steps:

[0011] Mix raw material A, raw material B and reaction medium to obtain a mixture; add the mixture and catalyst into a reaction container, seal and stir; after opening the reflux cooling device, heat the reaction container, and after steam reflux occurs, control the material reaction temperature to 80-95°C, and the reaction time to 8-12 hours; after the reaction is completed, cool to below 40°C to obtain a silicone lubricant.

[0012] Furthermore, the raw materials of the catalyst include cyclohexylaminopropyltrimethoxysilane and 3-ureapropyltrimethoxysilane, and the weight ratio of the cyclohexylaminopropyltrimethoxysilane to the 3-ureapropyltrimethoxysilane is 1:1.

[0013] Furthermore, the preparation method of the catalyst comprises the following steps:

[0014] Add catalyst raw materials into a reaction container; heat the reaction container to control the material reaction temperature to 80-100° C. and the reaction time to 4-6 hours; after the reaction is completed, cool to room temperature to obtain a catalyst.

[0015] Furthermore, the reaction temperature of the materials was controlled to be 90° C. and the reaction time was controlled to be 5 hours.

[0016] Furthermore, the rust inhibitor is any one or a combination of barium dinonylnaphthalene sulfonate, barium petroleum sulfonate, and calcium dinonylnaphthalene sulfonate; the oiliness agent is any one or a combination of trimethylolpropane ester, dipentaerythritol ester or tetrakis(3-mercaptobutyric acid)pentaerythritol ester, sulfurized olefins, sulfurized cottonseed oil, and hydrogenated lard.

[0017] Furthermore, the antioxidant is any one of thiocarbamate and zinc thiocarbamate or a combination of two thereof; the corrosion inhibitor is any one of benzotriazole, thiadiazole, tetrahydrobenzotriazole, isomeric dodecylbenzotriazole or a combination thereof; the base oil is any one of poly-α-olefin, isooctanoic acid diester, pentaerythritol ester, methyl oleate, propane oleate or a combination thereof.

[0018] In a second aspect, the present invention also discloses a method for preparing a metal processing lubricant, comprising the following steps: adding silicone lubricant, oiliness agent, rust inhibitor, antioxidant, and corrosion inhibitor components to a base oil while stirring at a temperature of 55 to 60°C until completely dissolved to obtain a lubricant.

[0019] In summary, this application has the following beneficial effects:

[0020] 1. The present invention adds the organic silicon lubricant in a certain proportion, oiliness agent, rust inhibitor, antioxidant and corrosion inhibitor components to the base oil in sequence at a temperature of 55-60°C while stirring until they are completely dissolved to obtain a finished lubricant; the finished lubricant is used in high-speed and high-strength metal processing procedures with good lubricity and good molding; according to experimental comparison, the lubricant product of the present invention is equivalent to or better than the traditional chlorine-containing lubricant product in extreme pressure lubricity, and the oil film is thinner.

[0021] 2. Since the lubricating oil product of the present invention does not use chlorine-containing raw materials, there is no risk of emission of such substances and no impact on the environment; and the preparation process of the present invention does not have tail liquid discharge, so there is no subsequent emission-related treatment work, and the production cost is lower.

[0022] 3. The lubricating oil product of the present invention and the chlorine-containing lubricating oil were subjected to a liquid phase corrosion test (GB / T11143). The test results showed that the lubricating oil product of the present invention could be rust-free for 72 hours, while the chlorine-containing lubricating oil could be rust-free for 54 hours. It can be seen that the lubricating oil product of the present invention is superior to the chlorine-containing lubricating oil in terms of rust prevention performance.

[0023] 4. The workpieces processed by the lubricating oil of the present invention were tested for washing efficiency using a water-based cleaning agent of the same concentration. The washing efficiency of the lubricating oil product of the present invention was 92.1%-92.8%, while the washing efficiency of the workpieces containing chlorine products was 85.8%-86.7%. That is to say, under the same cleaning conditions, the workpieces processed by the lubricating oil product of the present invention are easier to clean.

[0024] 5. The metal processing lubricating oil of the present invention does not contain chlorine element, thus avoiding the occurrence of chlorine corrosion, is easy to clean, and is green and environmentally friendly, thereby greatly improving processing efficiency. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Embodiment 1,

[0027] This embodiment is a preparation method of a catalyst, comprising the following steps:

[0028] 1. Add catalyst raw materials into a dry three-necked flask. The raw materials are 20 g each of methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-ureapropyltrimethoxysilane and cyclohexylaminopropyltrimethoxysilane;

[0029] 2. Turn on the stirring device for closed stirring, then turn on the heating device to control the material reaction temperature to 80°C and the reaction time to 4 hours;

[0030] 3. After the reaction is completed, cool to room temperature to obtain the catalyst.

[0031] Embodiment 2,

[0032] This embodiment is a second preparation of a catalyst, comprising the following steps:

[0033] 1. Add catalyst raw materials into a dry three-necked flask. The raw materials are 50 g each of cyclohexylaminopropyltrimethoxysilane and 3-ureapropyltrimethoxysilane;

[0034] 2. Turn on the stirring device for closed stirring, then turn on the heating device to control the material reaction temperature to 90°C and the reaction time to 5 hours;

[0035] 3. After the reaction is completed, cool to room temperature to obtain the catalyst.

[0036] Embodiment 3,

[0037] This embodiment is the preparation of catalyst three, comprising the following steps:

[0038] 1. Add catalyst raw materials into a dry three-necked flask. The raw materials are 25 g each of methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane and 3-ureapropyltrimethoxysilane;

[0039] 2. Turn on the stirring device for closed stirring, then turn on the heating device to control the material reaction temperature to 100°C and the reaction time to 6 hours;

[0040] 3. After the reaction is completed, cool to room temperature to obtain the catalyst.

[0041] Embodiment 4,

[0042] This example is the preparation of catalyst 4. Compared with Example 2, the only difference is that the catalyst raw materials are 25g each of 3-methacryloxypropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-ureapropyltrimethoxysilane and cyclohexylaminopropyltrimethoxysilane.

[0043] Embodiment 5,

[0044] This embodiment is a preparation method of an organosilicon lubricant, comprising the following steps:

[0045] 30g of raw material A, 30g of raw material B, 15g of isobutanol, and 60g of reaction medium were added to a 500ml dried three-necked flask in sequence, the stirring device was turned on, and the mixture was stirred evenly in a sealed state, then the stirring was stopped, 3g of the catalyst prepared in Example 1 was added, the stirring was turned on again, and the mixture was stirred in a sealed state. After the reflux cooling device was turned on, the three-necked flask was heated, and after steam reflux appeared, the reaction temperature of the materials was controlled to be 80°C, and the reaction time was 8 hours. After the reaction was completed, the mixture was cooled to room temperature and the product was taken out.

[0046] In this embodiment, raw material A is tetrabutyl ketone oxime silane, raw material B is hydroxy silicone oil, and the reaction medium is D80 base oil solvent.

[0047] Embodiment 6,

[0048] This embodiment is the second preparation of the organosilicon lubricant, comprising the following steps:

[0049] 25g of raw material A, 50g of raw material B, 12.5g of isobutanol, and 75g of reaction medium were added to a 500ml dried three-necked flask in sequence, the stirring device was turned on, and the mixture was stirred evenly in a sealed manner, then the stirring was stopped, 3g of the catalyst prepared in Example 2 was added, the stirring was turned on again, and the mixture was stirred in a sealed manner. After the reflux cooling device was turned on, the three-necked flask was heated, and after steam reflux appeared, the material reaction temperature was controlled to be 90°C, the reaction time was 10 hours, and after the reaction was completed, the mixture was cooled to room temperature and the product was taken out.

[0050] In this embodiment, raw material A is methyl tributylidene oxime silane, raw material B is amino silicone oil, and the reaction medium is D60 base oil solvent.

[0051] Embodiment 7,

[0052] This embodiment is the preparation of the silicone lubricant, which includes the following steps:

[0053] 50g of raw material A, 25g of raw material B, 25g of isobutanol, and 75g of reaction medium were added to a 500ml dried three-necked flask in sequence, the stirring device was turned on, and the mixture was stirred evenly in a sealed manner, then the stirring was stopped, 2g of the catalyst prepared in Example 3 was added, the stirring was turned on again, and the mixture was stirred in a sealed manner. After the reflux cooling device was turned on, the three-necked flask was heated, and after steam reflux appeared, the material reaction temperature was controlled to be 95°C, the reaction time was 12 hours, and after the reaction was completed, the mixture was cooled to room temperature and the product was taken out.

[0054] In this embodiment, raw material A is dimethyl dibutyl ketoxime silane, raw material B is a mixture of dimethyl silicone oil and ethyl silicone oil in a mass ratio of 1:1, and the reaction medium is D100 base oil solvent.

[0055] Embodiment 8,

[0056] This embodiment is a fourth preparation of an organosilicon lubricant, comprising the following steps:

[0057] 50g of raw material A, 50g of raw material B, 25g of isobutanol, and 75g of reaction medium were added to a 500ml dried three-necked flask in sequence, the stirring device was turned on, the mixture was stirred evenly in a sealed state, and then the stirring was stopped, 4g of the catalyst prepared in Example 4 was added, the stirring was turned on again, and the mixture was stirred in a sealed state. After the reflux cooling device was turned on, the three-necked flask was heated, and after steam reflux appeared, the reaction temperature of the material was controlled to be 88°C, the reaction time was 10 hours, and after the reaction was completed, the mixture was cooled to room temperature and the product was taken out.

[0058] In this embodiment, raw material A is a mixture of tetrabutyl ketoxime silane, methyl tributyl ketoxime silane, and dimethyl dibutyl ketoxime silane in a mass ratio of 1:1:1, raw material B is a mixture of hydroxy silicone oil, amino silicone oil, dimethyl silicone oil and ethyl silicone oil in a mass ratio of 1:1:1:1, and the reaction medium is an equal mass mixture solvent of C12-C16 isomeric alkanols.

[0059] The following are the quality indicators of the organosilicon lubricants prepared in Examples 4 to 8, as shown below:

[0060] Example Example 5 Example 6 Example 7 Example 8 Appearance Clear oily substance Clear oily substance Clear oily substance Clear oily substance density 0.975 0.975 0.976 0.974 <![CDATA[Kinematic viscosity (mm 2 / s)]]> 600 605 602 603

[0061] Example 9

[0062] This embodiment is a preparation method 1 of metalworking lubricating oil, comprising the following steps: adding silicone lubricant, oiliness agent, rust inhibitor, antioxidant, and corrosion inhibitor components to base oil at a temperature of 55°C while stirring until completely dissolved to obtain lubricating oil. The specific raw materials and parameters are as follows:

[0063] According to the mass percentage, 5% of the organosilicon lubricant prepared in Example 5, 2% of the rust inhibitor, 15% of the oiliness agent, 0.2% of the antioxidant, 0.1% of the corrosion inhibitor, and the balance is the base oil.

[0064] In this embodiment, the rust inhibitor is barium dinonylnaphthalene sulfonate; the oiliness agent is a mixture of trimethylolpropane ester, dipentaerythritol ester or tetrakis(3-mercaptobutyric acid)pentaerythritol ester, sulfided olefins, and the like.

[0065] The antioxidant is thiocarbamate; the corrosion inhibitor is a mixture of benzotriazole and thiadiazole in equal weight; and the base oil is a mixture of polyalphaolefin and isooctanoic acid diester in equal weight.

[0066] Embodiment 10

[0067] This embodiment is a second method for preparing metalworking lubricating oil, comprising the following steps: adding silicone lubricant, oiliness agent, rust inhibitor, antioxidant, and corrosion inhibitor components to base oil at a temperature of 57.5°C while stirring until completely dissolved to prepare lubricating oil. The specific raw materials and parameters are as follows:

[0068] In terms of mass percentage, it is 8.5% silicone lubricant, 3% rust inhibitor, 20% oiliness agent, 0.35% antioxidant, 0.15% corrosion inhibitor, and the remainder is base oil.

[0069] In this embodiment, the rust inhibitor is barium petroleum sulfonate; the oiliness agent is a mixture of sulfided olefins, sulfided cottonseed oil, and hydrogenated lard in equal amounts.

[0070] The antioxidant is zinc thiocarbamate; the corrosion inhibitor is an equal-mass mixture of benzotriazole, thiadiazole, tetrahydrobenzotriazole, and isomeric dodecylbenzotriazole; and the base oil is an equal-mass mixture of pentaerythritol ester, methyl oleate, and propane oleate.

[0071] Embodiment 11,

[0072] This embodiment is a third method for preparing metalworking lubricating oil, comprising the following steps: adding silicone lubricant, oiliness agent, rust inhibitor, antioxidant, and corrosion inhibitor components to base oil at a temperature of 60° C. while stirring until completely dissolved to prepare lubricating oil. The specific raw materials and parameters are as follows:

[0073] In terms of mass percentage, it is 12% silicone lubricant, 4% rust inhibitor, 25% oiliness agent, 0.5% antioxidant, 0.2% corrosion inhibitor, and the remainder is base oil.

[0074] In this embodiment, the rust inhibitor is calcium dinonylnaphthalene sulfonate; the oiliness agent is a mixture of equal weights of trimethylolpropane ester, dipentaerythritol ester or tetrakis(3-mercaptobutyric acid)pentaerythritol ester, sulfided olefins, sulfided cottonseed oil, and hydrogenated lard.

[0075] The antioxidant is a mixture of thiocarbamate and zinc thiocarbamate in equal weight; the corrosion inhibitor is a mixture of benzotriazole, thiadiazole, tetrahydrobenzotriazole, and isomeric dodecylbenzotriazole in equal weight; and the base oil is a mixture of polyalphaolefin, isooctanoic acid diester, pentaerythritol ester, methyl oleate, and propane oleate in equal weight.

[0076] Embodiment 12

[0077] This embodiment is a fourth method for preparing metalworking lubricating oil, comprising the following steps: adding silicone lubricant, oiliness agent, rust inhibitor, antioxidant, and corrosion inhibitor components to base oil at a temperature of 60° C. while stirring until completely dissolved to prepare lubricating oil. The specific raw materials and parameters are as follows:

[0078] In terms of mass percentage, it is 12% silicone lubricant, 3% rust inhibitor, 22% oiliness agent, 0.4% antioxidant, 0.18% corrosion inhibitor, and the remainder is base oil.

[0079] In this embodiment, the rust inhibitor is a mixture of barium dinonylnaphthalene sulfonate, barium petroleum sulfonate, and calcium dinonylnaphthalene sulfonate in equal weight; the oiliness agent is a mixture of sulfurized cottonseed oil and hydrogenated lard in equal weight.

[0080] The antioxidant is a mixture of thiocarbamate and zinc thiocarbamate in a mass ratio of 1:2; the corrosion inhibitor is benzotriazole; and the base oil is a mixture of polyalphaolefin, isooctanoic acid diester, propane oleate, etc.

[0081] The lubricating oils prepared in Examples 9-12 above were compared with the existing commercially available chlorine-containing additive lubricating oils and monitored according to the national standard GB / T3142 testing method. The results are as follows:

[0082]

[0083] According to the national standard GB / T3142 test method, the PD value of the lubricant indicates the minimum load that causes the rotating ball and the three stationary balls to sinter under the test conditions. The larger the value, the higher the lubrication extreme pressure of the oil and the greater the oil film strength. From the above data, it can be seen that the lubricating oil product of the present invention is equivalent to or better than the traditional chlorine-containing lubricating oil product in extreme pressure lubricity, and the oil film is thinner.

[0084] Since the lubricating oil product of the present invention does not use chlorine-containing raw materials, there is no risk of emission of such substances and no impact on the environment. The preparation process of the present invention does not have tail liquid discharge, so there is no subsequent related treatment work for the discharge. The lubricating oil product of the present invention and the chlorine-containing lubricating oil are used to carry out a liquid phase corrosion test (GB / T11143). The test results show that the lubricating oil product of the present invention can achieve 72 hours of no corrosion, and the chlorine-containing lubricating oil is 54 hours of no corrosion. It can be seen that the lubricating oil product of the present invention is superior to the chlorine-containing lubricating oil in rust prevention performance.

[0085] The processed workpieces were tested for washing efficiency using a water-based cleaning agent of the same concentration. The washing efficiency of the lubricant product of the present invention was 92.1%-92.8%, while the washing efficiency of the workpieces containing chlorine was 85.8%-86.7%. That is to say, under the same cleaning conditions, the workpieces processed by the lubricant product of the present invention are easier to clean.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A metalworking lubricant, characterized in that: The composition comprises the following components by weight percentage: 5-12% of organic silicon lubricant, 2-4% of rust inhibitor, 15-25% of oiliness agent, 0.2-0.5% of antioxidant, 0.1-0.2% of corrosion inhibitor, and the balance is base oil.

2. A metalworking lubricant according to claim 1, characterized in that: The organosilicon lubricant comprises the following components by weight: 50-100 parts of raw material A, 50-100 parts of raw material B, 25-50 parts of isobutyl alcohol, 100-150 parts of reaction medium and 5-8 parts of catalyst; The raw material A is one or a combination of tetrabutyl ketoxime silane, methyl tributyl ketoxime silane, and dimethyl dibutyl ketoxime silane; the raw material B is one or a combination of hydroxy silicone oil, amino silicone oil, dimethyl silicone oil, and ethyl silicone oil; the reaction medium is one or a combination of D60 base oil, D80 base oil, D100 base oil, and C12-C16 isomeric alkanol; the raw material of the catalyst is selected from one or a combination of methacryloxypropyl methyldiethoxysilane, 3-methacryloxypropyl methyldimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-ureapropyltrimethoxysilane, and cyclohexylaminopropyltrimethoxysilane.

3. A metalworking lubricant according to any one of claims 1 or 2, characterized in that: The organosilicon lubricant comprises the following components in parts by weight: 60 parts of raw material A, 60 parts of raw material B, 30 parts of isobutyl alcohol, 120 parts of reaction medium and 6 parts of catalyst.

4. A metalworking lubricant according to claim 2, characterized in that: The preparation method of the organosilicon lubricant comprises the following steps: Mix raw material A, raw material B and reaction medium to obtain a mixture; add the mixture and catalyst into a reaction container, seal and stir; after opening the reflux cooling device, heat the reaction container, and after steam reflux occurs, control the material reaction temperature to 80-95°C, and the reaction time to 8-12 hours; after the reaction is completed, cool to below 40°C to obtain a silicone lubricant.

5. A metalworking lubricant according to claim 2, characterized in that: The raw materials of the catalyst include cyclohexylaminopropyltrimethoxysilane and 3-ureapropyltrimethoxysilane, and the weight ratio of the cyclohexylaminopropyltrimethoxysilane to the 3-ureapropyltrimethoxysilane is 1:

1.

6. A metalworking lubricant according to any one of claims 2 or 5, characterized in that: The preparation method of the catalyst comprises the following steps: Add catalyst raw materials into a reaction container; heat the reaction container to control the material reaction temperature to 80-100° C. and the reaction time to 4-6 hours; after the reaction is completed, cool to room temperature to obtain a catalyst.

7. A metalworking lubricant according to claim 6, characterized in that: The reaction temperature of the materials was controlled to be 90°C and the reaction time was 5 hours.

8. A metalworking lubricant according to any one of claims 1 or 2, characterized in that: The rust inhibitor is any one or a combination of barium dinonylnaphthalene sulfonate, barium petroleum sulfonate, and calcium dinonylnaphthalene sulfonate; the oiliness agent is any one or a combination of trimethylolpropane ester, dipentaerythritol ester or tetrakis(3-mercaptobutyric acid)pentaerythritol ester, sulfurized olefins, sulfurized cottonseed oil, and hydrogenated lard.

9. A metalworking lubricant according to any one of claims 1 or 2, characterized in that: The antioxidant is any one of thiocarbamate and zinc thiocarbamate or a combination of two thereof; the corrosion inhibitor is any one of benzotriazole, thiadiazole, tetrahydrobenzotriazole, isomeric dodecylbenzotriazole or a combination thereof; the base oil is any one of polyalphaolefin, isooctanoic acid diester, pentaerythritol ester, methyl oleate, propane oleate or a combination thereof.

10. A method for preparing a metalworking lubricating oil, characterized in that: The method comprises the following steps: adding the organic silicon lubricant, oiliness agent, rust inhibitor, antioxidant and corrosion inhibitor components described in any one of claims 1 to 9 into the base oil while stirring at a temperature of 55 to 60° C. until they are completely dissolved, thereby obtaining a metalworking lubricant.

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