Degradable emulsified antirust lubricating oil and preparation method thereof

Abstract

The invention relates to the technical field of lubricating oil, and discloses degradable emulsified antirust lubricating oil and a preparation method thereof.The lubricating oil is prepared from, by weight, 10-20% of cobalt salt antirust component, 8-20% of emulsifier, 5-8% of fungi, 10-20% of lubricant, 0-1% of coupling agent, 0-0.2% of corrosion inhibitor, 3-6% of stabilizer and the balance base oil; the cobalt salt anti-rust component is a metal salt anti-rust component taking cobalt salt as a main component; the fungus is any one or a mixture of several of bacillus pumilus, bacillus subtilis and bacillus cereus; the preparation method comprises the following steps: adding the cobalt salt antirust component, the co-emulsifier, the fungi, the lubricant, the coupling agent, the corrosion inhibitor, the stabilizer and the base oil into a reaction kettle, heating to 45-50 DEG C, and uniformly stirring; and at the temperature of 45-50 DEG C, adding the main emulsifier while stirring until the system is uniform and transparent, thereby obtaining the anti-rust lubricating oil. The problems that existing antirust lubricating oil is large in smell, and water for cleaning metal workpieces pollutes the environment are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of lubricating oils, and particularly relates to a degradable emulsified anti-rust lubricating oil and a preparation method thereof. Background Art

[0002] When machining metals, in order to avoid or reduce the adverse effects caused by the rusting of metal workpieces during storage, which may lead to changes in the appearance, performance, and functionality of the metal workpieces, after machining, a process flow of cleaning-drying-anti-rusting-packaging is generally required for the surface of the machined workpieces. The long processing process not only has high requirements for equipment and sites, increases the labor cost, but also generates a large amount of waste liquid discharge during the cleaning process. The currently used anti-rust lubricating oils generally use main components such as paraffin and petroleum sulfonates, which have a strong odor. The water for cleaning also contains a large amount of surfactant substances, which will also cause environmental pollution and other problems. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a degradable emulsified anti-rust lubricating oil and a preparation method thereof, so as to solve the problems that the existing anti-rust lubricating oils have a strong odor and the water for cleaning metal workpieces causes environmental pollution.

[0004] The present invention solves the above technical problems through the following technical means:

[0005] In the first aspect, the present invention discloses a degradable emulsified anti-rust lubricating oil, which comprises the following components mixed by weight percentage: cobalt salt anti-rust component: 10-20%, emulsifier: 8-20%, fungi: 5-8%, lubricant: 10-20%, coupling agent: 0-1%, corrosion inhibitor: 0-0.2%, stabilizer: 3-6%, and the balance is base oil; the cobalt salt anti-rust component is a metal salt anti-rust component mainly composed of cobalt salt, and the fungi is any one or a mixture of several of Bacillus pumilus, Bacillus subtilis, and Bacillus cereus.

[0006] Further, the emulsifier comprises a main emulsifier and a co-emulsifier. The weight percentage of the main emulsifier in the anti-rust lubricating oil is 3-5%, and the main emulsifier is any one or a mixture of several of SP85, TW80, SP80, and EL20;

[0007] The weight percentage of the co-emulsifier in the anti-rust lubricating oil is 5-15%, and the co-emulsifier is any one or a mixture of several of oleyl alcohol-based glycoside triethylamine quaternary ammonium salt, geranylgeranyl alcohol-based glycoside triethylamine quaternary ammonium salt, coconut oil alcohol-based glycoside trimethylamine quaternary ammonium salt, and lauryl alcohol-based glycoside trimethylamine quaternary ammonium salt.

[0008] Further, the cobalt salt rust preventive component comprises the following components mixed by weight percentage: 35-45% of the main body, 1-2% of the neutralizer, 2-4% of the cosolvent, 0.5-1.0% of the dryer, and the balance is distilled water;

[0009] The main body is a modified acrylic resin, the neutralizer is methyldiisopropanolamine, and the cosolvent is one or a combination of two of ethylene glycol monobutyl ether and propylene glycol monoethyl ether; the dryer is an ionic dryer of polymetallic salts mainly composed of cobalt salts, with a metal content of 6-6.5%, including cobalt naphthenate, manganese naphthenate, and calcium naphthenate.

[0010] Further, the preparation method steps of the cobalt salt rust preventive component include: successively adding the main body, the neutralizer, and the cosolvent into a reaction kettle, stirring at a temperature of 45-55°C for 20-40 minutes, and the stirring speed is 200-300 r / min; after stirring evenly, slowly add the dryer into the reaction kettle, raise the temperature to 55-65°C, keep stirring until all are added, and then add distilled water to be transparent, thus obtaining the cobalt salt rust preventive component.

[0011] Further, the preparation method of the modified acrylic resin includes the following steps: adding an initiator and a chain transfer agent into a solvent, stirring and reacting at 80-90°C for 20-40 minutes to obtain a mixed system; dissolving a monomer in a solvent, dropping it into the mixed system at 90-100°C, and after the dropping is completed, stirring and reacting at 90-100°C for 100-140 minutes to obtain the modified acrylic resin;

[0012] The initiator is benzoyl peroxide; the chain transfer agent is tert-dodecyl mercaptoethanol; the solvent is propylene glycol monobutyl ether; the monomer is a mixture of one or several of 2-hydroxyethyl methacrylate, 4-hydroxybutyl acrylate, and ethyl 2-isopropylacrylate. This modified acrylic resin mainly introduces hydroxyl and carboxyl groups into the acrylic resin to make the resin a dispersion with a core-shell structure; the inner core is completely polymerized from hydrophobic monomers, and the hydrophilic units are all aggregated in the shell layer; due to the introduction of carboxyl-containing monomers in the dropping step in this preparation method, more carboxyl and hydroxyl groups can be exposed on the surface, which can effectively enhance the water dispersibility of the product.

[0013] Further, the coupling agent is any one or a mixture of two of n-octanoic acid, isononanoic acid, and neodecanoic acid; the corrosion inhibitor is any one or a mixture of several of benzotriazole, thiadiazole, tetrahydrobenzotriazole, and isododecylbenzotriazole.

[0014] Further, the lubricant is any one or a mixture of several of trimethylolpropane trioleate, dipentaerythritol ester, pentaerythritol tetrakis(3-mercaptobutyrate), and hydrogenated lard.

[0015] Further, the stabilizer is any one or a mixture of several of sodium carbonate, potassium hydroxide, diisopropanolamine, and monoisopropanolamine.

[0016] Further, the base oil is any one or a mixture of several of rapeseed oil, palm oil, white mineral oil, and hydrogenated lard.

[0017] In a second aspect, the present invention also discloses a preparation method of a degradable emulsified rust preventive lubricating oil, comprising the following steps:

[0018] Add the cobalt salt rust preventive component, co-emulsifier, fungi, lubricant, coupling agent, corrosion inhibitor, stabilizer, and base oil into a reaction kettle, heat up to 45 - 50 °C, and stir evenly; while maintaining the temperature at 45 - 50 °C, add the main emulsifier while stirring until the system becomes homogeneous and transparent to obtain the rust preventive lubricating oil. By adding the main emulsifier later in this solution, the optimal stable amount of the emulsified oil can be adjusted using the emulsifier.

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

[0020] 1. When diluted at a low concentration (5 wt%), the present invention has good metal processing performance and better rust prevention performance. When the dilution concentration reaches a certain level (10 - 30 wt%), the metal protection performance is excellent, avoiding the waste, environmental harm, and safety risks brought by solvents. It can be used in the lubrication processing of ferrous metals and some non-ferrous metals; it can also be used for subsequent rust prevention in metal processing, and generally, the workpiece does not need to be cleaned.

[0021] 2. The present invention introduces Bacillus pumilus, Bacillus subtilis, and Bacillus cereus. When subsequent cleaning is required, the activity of the fungi contained therein is activated, and the active spores form a symbiotic cooperation system. With the synergistic effect of the cobalt salt, the surfactant component can be degraded relatively quickly, the system stability can be destroyed. Through reasonable process control, the waste liquid can be separated into oil and water, and it is easy to be treated to meet the discharge requirements. The generated waste liquid is easy to be treated, and the COD value of the treatment liquid can be quickly reduced to below 2000 ppm through a simple process and can be directly discharged after being diluted with tap water at a certain ratio; however, the existing rust preventive lubricating oil cannot be degraded and will cause pollution and harm to the environment.

[0022] 3. The present invention uses metal salts mainly based on cobalt salts as rust preventive components to replace traditional sulfonate rust preventive substances. Sulfonate substances have a strong odor, while the lubricating oil of the present invention is basically odorless, which can improve the metal processing use environment. Specific Embodiments

[0023] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1

[0025] This embodiment is a preparation method 1 of a degradable emulsified anti-rust lubricating oil, and the steps are as follows:

[0026] First, the preparation of the cobalt salt anti-rust component. The steps include sequentially adding a main body, a neutralizing agent, and a co-solvent to a reaction kettle, stirring at a temperature of 45°C for 20 minutes, and the stirring speed is 200 r / min; after stirring evenly, slowly add a drier to the reaction kettle, raise the temperature to 55°C, keep stirring until all are added, and then add distilled water to make it transparent, thus obtaining the cobalt salt anti-rust component. The cobalt salt anti-rust component includes the following components mixed by weight percentage: 35% of the main body, 1% of the neutralizing agent, 2% of the co-solvent, 0.5% of the drier, and the balance is distilled water; referring to GB / T 1720 Determination Method for Film Adhesion, the adhesion of the prepared finished product is detected as grade 1.

[0027] The main body of this embodiment is a modified acrylic resin, the neutralizing agent is methyldiisopropanolamine, and the co-solvent is ethylene glycol monobutyl ether; the drier is an ionic drier of polymetallic salts mainly based on cobalt salts, with a metal content of 6%, including cobalt naphthenate (metal content 3.5%), manganese naphthenate (metal content 1.5%), and calcium naphthenate (metal content 1%).

[0028] Second, the preparation of the modified acrylic resin includes the following steps

[0029] Add an initiator and a chain transfer agent to a solvent, stir and react at 80°C for 20 minutes to obtain a mixed system; dissolve a monomer in a solvent, and drop it into the mixed system at 90°C. After the dropping is completed, stir and react at 90°C for 100 min to obtain the modified acrylic resin;

[0030] The initiator of this embodiment is benzoyl peroxide; the chain transfer agent is tert-dodecyl mercaptoethanol; the solvent is propylene glycol monobutyl ether; the monomer is 2-hydroxyethyl methacrylate.

[0031] Third, the preparation of the degradable emulsified anti-rust lubricating oil includes the following steps:

[0032] Add cobalt salt rust inhibitor component, co-emulsifier, fungi, lubricant, coupling agent, corrosion inhibitor, stabilizer and base oil into a reaction kettle, heat up to 45 - 50 °C and stir evenly; while maintaining the temperature at 45 - 50 °C, add the main emulsifier while stirring until the system becomes homogeneous and transparent to obtain anti-rust lubricating oil.

[0033] In this example, the coupling agent is n-octanoic acid; the corrosion inhibitor is benzotriazole. The lubricant is trimethylolpropane oleate. The stabilizer is sodium carbonate. The base oil is rapeseed oil.

[0034] The emulsifier in this example includes a main emulsifier and a co-emulsifier. The main emulsifier is SP85; the co-emulsifier is oleyl alcohol glycoside triethylamine quaternary ammonium salt.

[0035] In this example, the cobalt salt rust inhibitor component by mass fraction is 10%, the main emulsifier is 3%, the co-emulsifier is 5%, the fungi is 5%, the lubricant is 10%, the stabilizer is 3 - 6%, and the balance is the base oil; the cobalt salt rust inhibitor component is a metal salt rust inhibitor component mainly composed of cobalt salt, and the fungi is Bacillus pumilus.

[0036] Example 2

[0037] This example is a preparation method of a degradable emulsified anti-rust lubricating oil, and the steps are as follows:

[0038] First, the preparation of the cobalt salt rust inhibitor component, the steps include sequentially adding the main body, neutralizer, co-solvent into a reaction kettle, stirring at 50 °C for 30 min, and the stirring speed is 250 r / min; after stirring evenly, slowly add the dryer into the reaction kettle, heat up to 60 °C, keep stirring until all are added, and then add distilled water to be transparent to obtain the cobalt salt rust inhibitor component. The cobalt salt rust inhibitor component includes the following components mixed by weight percentage: the main body 40%, the neutralizer 1.5%, the co-solvent 3%, the dryer 0.75%, and the balance is distilled water; referring to GB / T 1720 Determination method for adhesion of paint films, the adhesion test of the prepared finished product is grade one.

[0039] The main body in this example is a modified acrylic resin, the neutralizer is methyldiisopropanolamine, the co-solvent is propylene glycol monoethyl ether; the dryer is an ionic dryer of multi-metal salts mainly composed of cobalt salt, with a metal content of 6.5%, including cobalt naphthenate (metal content 3.5%), manganese naphthenate (metal content 1.5%) and calcium naphthenate (metal content 1.5%).

[0040] Third, the preparation of the modified acrylic resin, including the following steps

[0041] The initiator and the chain transfer agent are added to the solvent, and stirred at 85 °C for 30 minutes to obtain a mixed system; the monomer is dissolved in the solvent and added dropwise to the mixed system at 95 °C. After the addition is completed, it is stirred at 95 °C for 120 min to prepare the modified acrylic resin.

[0042] The initiator in this example is benzoyl peroxide; the chain transfer agent is tert-dodecyl mercaptoethanol; the solvent is propylene glycol monobutyl ether; the monomer is an equal-volume mixture of 4-hydroxybutyl acrylate and ethyl 2-isopropylacrylate.

[0043] Third, the preparation of the degradable emulsified anti-rust lubricating oil includes the following steps:

[0044] The cobalt salt anti-rust component, co-emulsifier, fungi, lubricant, coupling agent, corrosion inhibitor, stabilizer and base oil are added to the reaction kettle, and after heating to 48 °C, it is stirred evenly; while maintaining the temperature at 48 °C, the main emulsifier is added while stirring until the system becomes homogeneous and transparent to obtain the anti-rust lubricating oil.

[0045] The coupling agent in this example is an equal-volume mixture of isononanoic acid and neodecanoic acid; the corrosion inhibitor is an equal-volume mixture of thiadiazole, tetrahydrobenzotriazole, and isomeric dodecylbenzotriazole. The lubricant is an equal-volume mixture of ditrimethylolpropane tetraester, pentaerythritol tetra(3-mercaptobutyrate), and hydrogenated lard. The stabilizer is an equal-volume mixture of diisopropanolamine and monoisopropanolamine. The base oil is an equal-volume mixture of white mineral oil and hydrogenated lard.

[0046] The emulsifier in this example includes a main emulsifier and a co-emulsifier. The main emulsifier is an equal-volume mixture of TW80, SP80, and EL20; the co-emulsifier is an equal-volume mixture of Guerbet alcohol-based glycoside triethylamine quaternary ammonium salt, coconut alcohol-based glycoside trimethylamine quaternary ammonium salt, and lauryl alcohol-based glycoside trimethylamine quaternary ammonium salt.

[0047] In this example, the cobalt salt anti-rust component by mass fraction is 15%, the main emulsifier is 4%, the co-emulsifier is 10%, the fungi is 6.5%, the lubricant is 15%, the coupling agent is 0.5%, the corrosion inhibitor is 0.1%, the stabilizer is 4.5%, and the balance is the base oil; the cobalt salt anti-rust component is a metal salt anti-rust component mainly composed of cobalt salt, and the fungi is an equal-volume mixture of Bacillus subtilis and Bacillus cereus.

[0048] Example 3

[0049] This example is a preparation method 1 of the degradable emulsified anti-rust lubricating oil, and the steps are as follows:

[0050] First, the preparation of the cobalt salt rust inhibitor component. The steps include sequentially adding the main body, neutralizing agent, and cosolvent into a reaction kettle, stirring at a temperature of 55°C for 40 minutes, and the stirring speed is 300 r / min. After stirring evenly, slowly add the drier into the reaction kettle, raise the temperature to 65°C, keep stirring until all are added, and then add distilled water to make it transparent, thus obtaining the cobalt salt rust inhibitor component. The cobalt salt rust inhibitor component includes the following components mixed by weight percentage: 45% of the main body, 2% of the neutralizing agent, 4% of the cosolvent, 1.0% of the drier, and the balance is distilled water. The adhesion of the prepared finished product can be detected as grade one with reference to GB / T 1720 Determination Method for Adhesion of Paint Films.

[0051] In this embodiment, the main body is a modified acrylic resin, the neutralizing agent is methyldiisopropanolamine, the cosolvent is an equal-volume mixture of ethylene glycol monobutyl ether and propylene glycol monoethyl ether; the drier is an ionic drier of polymetallic salts mainly composed of cobalt salts, with a metal content of 6.5%, including cobalt naphthenate (metal content about 3.5%), manganese naphthenate (metal content about 1.5%), and calcium naphthenate (metal content about 1.5%).

[0052] Fourth, the preparation of the modified acrylic resin includes the following steps.

[0053] Add the initiator and chain transfer agent into the solvent, stir and react at 90°C for 40 minutes to obtain a mixed system; dissolve the monomer in the solvent, drop it into the mixed system at 100°C, and after the dropping is completed, stir and react at 100°C for 140 minutes to obtain the modified acrylic resin.

[0054] In this embodiment, the initiator is benzoyl peroxide; the chain transfer agent is tert-dodecyl mercaptoethanol; the solvent is propylene glycol monobutyl ether; the monomer is an equal-volume mixture of 2-hydroxyethyl methacrylate, 4-hydroxybutyl acrylate, and ethyl 2-isopropylacrylate.

[0055] Third, the preparation of the degradable emulsified rust preventive lubricating oil includes the following steps:

[0056] Add the cobalt salt rust inhibitor component, co-emulsifier, fungi, lubricant, coupling agent, corrosion inhibitor, stabilizer, and base oil into the reaction kettle, raise the temperature to 50°C and stir evenly; while maintaining the temperature at 50°C, add the main emulsifier while stirring until the system becomes homogeneous and transparent to obtain the rust preventive lubricating oil.

[0057] In this embodiment, the coupling agent is an equal - volume mixture of n - octanoic acid, isononanoic acid, and neodecanoic acid; the corrosion inhibitor is an equal - volume mixture of benzotriazole, thiadiazole, tetrahydrobenzotriazole, and isomeric dodecylbenzotriazole. The lubricant is an equal - volume mixture of trimethylolpropane oleate, ditrimethylolpropane pentaerythritol ester, pentaerythritol tetra(3 - mercaptobutyrate), and hydrogenated lard. The stabilizer is an equal - volume mixture of sodium carbonate, potassium hydroxide, diisopropanolamine, and monoisopropanolamine. The base oil is an equal - volume mixture of rapeseed oil, palm oil, white mineral oil, and hydrogenated lard.

[0058] The emulsifier in this embodiment includes a main emulsifier and a co - emulsifier. The main emulsifier is an equal - volume mixture of SP85, TW80, SP80, and EL20; the co - emulsifier is an equal - volume mixture of oleyl alcohol - based glycoside triethylamine quaternary ammonium salt, guerbet alcohol - based glycoside triethylamine quaternary ammonium salt, coconut alcohol - based glycoside trimethylamine quaternary ammonium salt, and lauryl alcohol - based glycoside trimethylamine quaternary ammonium salt.

[0059] In this embodiment, the mass - fraction of the cobalt - salt rust - prevention component is 20%, the main emulsifier is 5%, the co - emulsifier is 15%, the fungi are 8%, the lubricant is 20%, the coupling agent is 1%, the corrosion inhibitor is 0.2%, the stabilizer is 6%, and the balance is the base oil; the cobalt - salt rust - prevention component is a metal - salt rust - prevention component mainly composed of cobalt salts, and the fungi are an equal - volume mixture of Bacillus pumilus, Bacillus subtilis, and Bacillus cereus.

[0060] Next, the performance indicators of the lubricating oil products prepared in the above Examples 1 - 3 are measured, and the performance indicators are shown in the following table:

[0061]

[0062]

[0063]

[0064] The lubricating oil product of the present invention is used by diluting the stock solution with water and is applicable to different processes or working procedures. The specific liquid - preparation concentration needs to be determined according to customer requirements. The rust - prevention performance of the 5wt% and 20wt% working fluids is equivalent to that of the product containing an equal amount of sulfonate rust - inhibitor in humidity and salt - spray tests. At the same time, since the lubricating oil product prepared by the present invention does not use sulfonate substances, the adverse effects of sulfonate substances on odor and the environment are avoided.

[0065] In the lubricating oil product system of the present invention, a mixed system of Bacillus pumilus, Bacillus subtilis, and Bacillus cereus is used. When it is necessary to remove the residues on the surface after the product is used, water containing 2% molasses can be sprayed on the workpiece surface, the room temperature can be controlled at 35 - 40 °C, and a certain amount of oxygen can be blown. After 4 - 6 hours, the activity of the fungal substances can be fully stimulated to form a symbiotic cooperation system, rapidly degrade the surfactant components, and destroy the stability of the emulsion, so that the COD index of the working fluid system can be rapidly reduced to less than 2000 ppm after simple treatment; however, the existing antirust lubricating oil cannot be degraded and will cause pollution damage to the environment.

[0066] In addition, when the applicant replaces Bacillus pumilus, Bacillus subtilis, and Bacillus cereus in this application with other Pseudomonas, the degradation effects of this application cannot be achieved. This shows that the mixed system of Bacillus pumilus, Bacillus subtilis, and Bacillus cereus used in this application, in combination with the synergistic effect of cobalt salts, can rapidly degrade the surfactant components, destroy the stability of the emulsion, and make the COD index of the working fluid system rapidly drop below 2000 ppm after simple treatment.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention. The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A biodegradable emulsified anti-rust lubricating oil, characterized in that: The invention comprises the following components mixed in weight percentage: 10-20% of cobalt salt antirust component, 8-20% of emulsifier, 5-8% of fungi, 10-20% of lubricant, 0-1% of coupling agent, 0-0.2% of corrosion inhibitor, 3-6% of stabilizer, and the balance is base oil; the cobalt salt antirust component is a metal salt antirust component mainly composed of cobalt salt, and the fungi are any one of Bacillus brevis, Bacillus subtilis and Bacillus cereus, or a mixture of several of them.

2. A biodegradable emulsified anti-rust lubricating oil according to claim 1, characterized in that: The emulsifier includes a main emulsifier and an auxiliary emulsifier, the weight percentage of the main emulsifier in the anti-rust lubricating oil is 3-5%, and the main emulsifier is any one of SP85, TW80, SP80, EL20 or a mixture of several thereof; The weight percentage of the auxiliary emulsifier in the anti-rust lubricating oil is 5-15%, and the auxiliary emulsifier is any one of oleyl glycoside triethylamine quaternary ammonium salt, Guerbet alcohol glycoside triethylamine quaternary ammonium salt, coconut oil alcohol glycoside trimethylamine quaternary ammonium salt, and lauryl alcohol glycoside trimethylamine quaternary ammonium salt, or a mixture of several of them.

3. A biodegradable emulsified anti-rust lubricating oil according to any one of claims 1 or 2, characterized in that: The cobalt salt anti-rust component comprises the following components mixed in weight percentage: 35-45% of the main body, 1-2% of the neutralizer, 2-4% of the cosolvent, 0.5-1.0% of the drying agent, and the balance is distilled water; The main body is modified acrylic resin, the neutralizer is methyl diisopropanolamine, the cosolvent is one or a combination of ethylene glycol butyl ether and propylene glycol ethyl ether; the drying agent is an ionic drying agent of a multi-metal salt mainly composed of cobalt salt, wherein the metal content is 6-6.5%, including cobalt cyclopentaneate, manganese cyclopentaneate and calcium cyclopentaneate.

4. A biodegradable emulsified anti-rust lubricating oil according to claim 3, characterized in that: The preparation method of the cobalt salt anti-rust component comprises the following steps: adding a main body, a neutralizing agent and a cosolvent into a reaction kettle in sequence, stirring at a temperature of 45-55° C. for 20-40 minutes at a stirring speed of 200-300 r / min; after stirring evenly, slowly adding a drying agent into the reaction kettle, heating to 55-65° C., keeping the temperature and stirring until all the ingredients are added, and then adding distilled water until the mixture becomes transparent, thereby obtaining the cobalt salt anti-rust component.

5. The biodegradable emulsified anti-rust lubricating oil according to claim 3, characterized in that: The preparation method of the modified acrylic resin comprises the following steps: adding an initiator and a chain transfer agent into a solvent, stirring and reacting at 80-90° C. for 20-40 minutes to obtain a mixed system; dissolving a monomer in a solvent, dripping it into the mixed system at 90-100° C., and after the dripping is completed, stirring and reacting at 90-100° C. for 100-140 minutes to obtain a modified acrylic resin; The initiator is benzoyl peroxide; the chain transfer agent is tert-dodecylmercaptoethanol; the solvent is propylene glycol butyl ether; and the monomer is one or a mixture of hydroxyethyl methacrylate, 4-hydroxybutyl acrylate, and 2-isopropyl-ethyl acrylate.

6. The biodegradable emulsified anti-rust lubricating oil according to claim 1, characterized in that: The coupling agent is any one of n-octanoic acid, isononanoic acid and neodecanoic acid or a mixture of two of them; the corrosion inhibitor is any one of benzotriazole, thiadiazole, tetrahydrobenzotriazole and isomeric dodecylbenzotriazole or a mixture of several of them.

7. The biodegradable emulsified anti-rust lubricating oil according to claim 1, characterized in that: The lubricant is any one of trimethylolpropane oleate, dipentaerythritol, tetrakis(3-mercaptobutyric acid)pentaerythritol ester and hydrogenated lard or a mixture of several of them.

8. The biodegradable emulsified anti-rust lubricating oil according to claim 1, characterized in that: The stabilizer is any one of sodium carbonate, potassium hydroxide, diisopropanolamine and monoisopropanolamine, or a mixture of several of them.

9. The biodegradable emulsified anti-rust lubricating oil according to claim 1, characterized in that: The base oil is any one of rapeseed oil, palm oil, white mineral oil and hydrogenated lard or a mixture of several of them.

10. A method for preparing a biodegradable emulsified anti-rust lubricating oil, characterized in that: The lubricating oil is the lubricating oil of claim 2, and the preparation method comprises the following steps: Add cobalt salt anti-rust components, emulsifier, fungi, lubricant, coupling agent, corrosion inhibitor, stabilizer and base oil into a reactor, heat to 45-50°C and stir evenly; add the main emulsifier while stirring at 45-50°C until the system becomes uniform and transparent to obtain the anti-rust lubricating oil.

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