230 results about "Oil additive" patented technology

The invention relates to the technical field of marine fuel oil additives, and particularly provides a marine fuel oil purification synergist and a preparation method thereof. The marine fuel oil purification synergist comprises the following components in percentage by mass: 8%-12% of a sulfur capturing agent, 15%-20% of a core-shell dispersing agent, 5%-8% of a lubricating agent, 0.5%-1% of an antioxidant, 1%-2% of a pour point depressant and the balance of a solvent. The marine fuel oil purification synergist has the advantages of high flash point, sulfur inhibition, combustion enhancement and dispersion stability. The multi-component synergistic system not only greatly improves the combustion efficiency of the marine fuel oil, but also effectively inhibits the emission of harmful substances, obviously reduces the carbon deposition and wear of an engine, and keeps the cleanliness of a fuel oil system. In practical application, the synergist shows excellent environment-friendly benefits and economic benefits, and a green fuel solution which can meet increasingly strict requirements of environment-friendly laws and regulations and can reduce the operation cost is provided for the ship industry.

The utility model belongs to the technical field of lubricating oil additive filling, and particularly relates to a lubricating oil additive finished product filling device which comprises a base, supporting legs are arranged at the four corners of the bottom of the base, a filling mechanism is installed on the top of the base, and the rear end of the filling mechanism is communicated with a stirring mechanism. And a conveying mechanism is arranged below the filling mechanism. According to the filling mechanism disclosed by the utility model, the lubricating oil additive can be quickly filled through the cooperative operation of the liquid pump, the hose, the connecting pipe and the filling head. The electric telescopic rod can adjust the height of the filling head to adapt to filling containers of different specifications, and the universality of the equipment is improved; the electromagnetic valve can accurately control opening and closing of each filling head, and the accuracy of the filling amount is ensured.

The application provides an acid ester composite diesel anti-wear agent and a preparation method thereof, and belongs to the technical field of diesel additives, and comprises the following steps: S1, preparing a silanized solid acid catalyst; S2, preparing C18 polyol ester; S3, mixing an acid type anti-wear component and the C18 polyol ester, and then stirring after heating, and then adding tetrahydropyrazole pyridine derivatives and a diluent to continue stirring, and then cooling and filtering to obtain the acid ester composite diesel anti-wear agent. The application can improve the lubricity and anti-wear performance of low-sulfur diesel at a lower additive dosage, and has low corrosion and good oxidation stability.

The invention provides a diesel oil anti-wear agent and a preparation process thereof, and belongs to the technical field of diesel oil additives, and the preparation process comprises the following steps: mixing and stirring diisooctyl maleate and xylene, adding diethylenetriamine and deionized water, carrying out heating reaction, adding toluene, 4-(aminomethyl) pyridine and ethylene oxide, carrying out mixing reaction, filtering, washing, and drying to obtain the diesel oil anti-wear agent. The pyridinium-based polyester hollow capsule is prepared; the preparation method comprises the following steps: mixing xylene, catechol, ethylene phosphonic acid, ammonium persulfate and deionized water, heating, dispersing in cyclohexane, adding polyvinyl alcohol, octadecyl methacrylate and azodiisobutyronitrile, mixing and reacting to obtain catechol phosphonate nano colloidal particles; mixing and stirring the fatty acid ester solution, the oleoyl fluorocarbon copolymer and the pyridinium-based polyester hollow capsule, adding the catechol phosphonate nano colloidal particles, continuously stirring, performing ultrasonic treatment, and degassing to obtain the diesel oil anti-wear agent. The diesel oil antiwear agent can improve the antiwear property and demulsibility of the diesel oil antiwear agent.

The invention provides a nitrogen-containing boric acid ester-nano hybrid composite anti-wear additive as well as a preparation method and application thereof, and belongs to the technical field of lubricating oil additives. The nitrogen-containing boric acid ester, the functionalized nanoparticles, the ionic liquid, the auxiliary anti-wear agent and the dispersion stabilizer are subjected to nano-scale hybrid compounding, and the nitrogen-containing boric acid ester, the functionalized nanoparticles, the ionic liquid, the auxiliary anti-wear agent and the dispersion stabilizer have a synergistic effect on four aspects of physical bearing, chemical adsorption, interface modification and extreme pressure enhancement; a multi-synergistic lubrication and protection system of an adsorption film, a physical isolation layer, an extreme pressure reaction layer and rolling lubrication microspheres is constructed, efficient wear resistance, friction reduction, bearing and stability improvement are jointly achieved, and the lubricating oil is suitable for insoluble base oil.

The invention addresses the instability and toxicity of organometallic compounds used as fuel additives, which can pose environmental and health risks during handling. While these additives improve fuel combustion, efficiency, and reduce emissions by increasing octane, their handling exposes humans and the environment. This invention provides a formulation, coating process (spraying, immersion, extrusion, powder coating), and testing method to prevent direct contact. Coatings, comprising organic hydrocarbons, do not hinder octane enhancement, ensure deposit-free release in fuel tanks, and clean the fuel system. The coating also prevents sublimation during storage. Performance is evaluated by measuring weight loss under vacuum.

The application belongs to the technical field of lubricating oil additives, and particularly relates to a polyisobutylene succinimide dispersant as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing polyisobutylene maleic anhydride, base oil and aromatic hydrocarbon solvent, then adding aminobenzene boronic acid, and performing reaction by increasing temperature to reflux temperature, and obtaining the polyisobutylene succinimide dispersant after filtration. The polyisobutylene succinimide dispersant is prepared by using polyisobutylene maleic anhydride and aminobenzene boronic acid, the molecular structure of the polyisobutylene succinimide dispersant contains not only an aromatic ring but also an oxygen-containing benzene boronic acid group, the aromatic ring and the benzene boronic acid group both have a good adsorption effect on soot particles, and the ability of the polyisobutylene succinimide dispersant to disperse soot is improved. The performance test results show that the oil product prepared by using the polyisobutylene succinimide dispersant of the application not only improves the soot dispersion performance of the oil product, but also improves the high-temperature detergency of the oil product, and the preparation process is simple and easy to implement.

The utility model relates to the technical field of reaction kettles, in particular to a reaction kettle for purifying lubricating oil additives, which comprises a lifting and storing tank, a feeding pipe, a discharging component and stirring blades, an air pressure balance tank is mounted on the upper side of the lifting and storing tank, and a first exhaust pipe is arranged at one end of the upper side of the lifting and storing tank; a first air pump is installed at one end of the first air suction pipe, a first air outlet pipe is installed at one end of the lower side of the air pressure balance tank, a second air outlet pipe is arranged at the other end of the upper side of the lifting and storing tank, and a second air pump is installed at one end of the second air outlet pipe. The discharging component is detachable, the reaction kettle is convenient to clean after the purification reaction, the detachable filtering structure is arranged, the use convenience is improved, the air pressure in the extraction and storage tank is adjusted through the air pressure balance tank, the flatness and stability of the air pressure in the extraction and storage tank in the working process are improved, and the purification reaction efficiency is improved.

The utility model relates to the technical field of lubricating oil additive proportioning, and discloses a lubricating oil additive proportioning device which comprises a supporting plate, a circular plate, a proportioning box and a lifting mechanism, a material box is arranged on the supporting plate, and according to the lubricating oil additive proportioning device, the circular plate is arranged at the bottom end of a branch pipe body of a material guide pipe; a matching box rotationally connected with the circular plate is arranged below the supporting plate, a discharging control mechanism is arranged at the bottom of a material cavity of the matching box, a plurality of connecting rods are arranged on the lifting mechanism, a discharging barrel is arranged at one end of each connecting rod, and additives in a material box are guided into the multiple material cavities of the matching box through a material guiding pipe. When an additive with a required amount is needed, only the proportioning box needs to be rotated to be switched to the material cavities with the corresponding required amount, then the additive is guided out through cooperation of the discharging barrel and the discharging control mechanism, after the proportioning box is rotated, the empty material cavities can be automatically filled through the material guiding pipe, repeated weighing by workers is not needed, time is greatly saved, and the working efficiency is improved.

The present invention provides a thiadiazole compound containing a hindered phenol group, a preparation method thereof and its use in the field of lubricating oil additives. The preparation method of the thiadiazole compound containing a hindered phenol group comprises the following steps: mixing a carboxylic acid compound containing a hindered phenol group with thionyl chloride, removing impurities under reduced pressure to obtain an acyl chloride compound containing hindered phenol; stirring and mixing 2-mercapto-5-amino-1,3,4-thiadiazole with a halogenated hydrocarbon compound, filtering, washing and drying to obtain a 2-mercapto-5-amino-1,3,4-thiadiazole derivative; adding a hindered phenol acyl chloride compound, 2-mercapto-5-amino-1,3,4-thiadiazole derivative and an alkaline additive to an organic solvent, washing, drying and purifying to obtain a thiadiazole compound containing a hindered phenol group. The thiadiazole compound containing a hindered phenol group is an antioxidant, extreme pressure and anti-wear additive, which can be applied to synthetic ester lubricants and has a good antioxidant, extreme pressure and anti-wear effect.

The invention discloses an oil-soluble Mo-functionalized graphene composite material as well as a preparation method and application thereof, and belongs to the field of lubricating oil additives. The preparation method comprises the following steps: (1) mixing a Mo-functionalized graphene composite material with an organic solvent, and performing ultrasonic treatment to form a solution A; (2) adding an amine reducing agent into the solution A, carrying out reduction reaction, filtering and washing to obtain a filter cake; and (3) mixing a long-chain organic compound, a coupling agent and a surfactant, performing ultrasonic treatment to form a mixed solution B, performing ultrasonic dispersion on the filter cake into the mixed solution B, and performing heating treatment, cooling, filtering, washing and drying to obtain the oil-soluble Mo-functionalized graphene composite material. Through partial reduction and chemical grafting processes, the Mo-functionalized graphene composite material is subjected to selective reduction firstly, then a coupling agent is utilized to graft a long-chain organic compound to the surface of the composite material, and an oil-soluble group is introduced, so that the dispersion stability and the anti-wear and anti-friction performance in lubricating oil are remarkably improved.

The present invention discloses an anti-wear and anti-oxidation lubricating oil additive, its preparation method, and its application. This invention relates to the field of lubricating materials technology and addresses the problem of unsatisfactory thermal oxidation stability of existing lubricating oil additives. The anti-wear and anti-oxidation lubricating oil additive comprises a compound represented by Formula I: #imgabs0#, where R is an alkali metal or alkaline earth metal. The additive provided by the present invention exhibits excellent thermal oxidation stability.

The invention belongs to the technical field of lubricating oil additives, and particularly relates to an anti-foaming agent and a preparation method and application thereof. The anti-foaming agent provided by the invention is a copolymer of a monomer 1 and a monomer 2, the monomer 1 comprises 2-ethylhexyl acrylate, and the monomer 2 comprises one or two of ethyl acrylate, styrene and butyl acrylate. The anti-foaming agent provided by the invention has good thermal stability and can adapt to long-term use in a higher-temperature environment; meanwhile, the anti-foaming agent provided by the invention has good compatibility with mineral oil, synthetic oil and other oil substances, and can be uniformly dispersed in lubricating oil. The anti-foaming agent provided by the invention has an excellent anti-foaming effect when being used in high-viscosity lubricating oil.

The utility model provides a dust recovery mechanism for producing a lubricating oil additive, and belongs to the technical field of dust recovery mechanisms. Comprising a dust suction box and a dust suction frame fixed to the bottom end of the side wall of the dust suction box, a filter plate is fixedly embedded in the top end of the dust suction box, a baffle is fixed to the center of the bottom wall of the dust suction box, a conveying frame is fixed to the top end of the baffle, and a flow guide plate of an arc-shaped structure is installed at the top end of the conveying frame; a water conveying mechanism connected with the conveying frame is arranged at the center position of the baffle. The water pump enables water flow to flow along the conveying frame, the water outlet groove and the top wall of the flow guide plate through the conveying pipe, water curtains are formed on the two sides of the baffle, the draught fan in the dust collection frame enables air to enter the dust collection box after being started, dust carried in the air is adsorbed by the water curtains and flows downwards, the dust in the air is conveniently adsorbed, and the dust collection efficiency is improved. Dust needing to be filtered by the filter plate is greatly reduced, and the situation that the filter plate is blocked by the dust is reduced.

The embodiment of the invention provides a method for preparing high-performance heavy alkyl benzene sulfonic acid barium salt by modifying a heavy alkyl benzene raw material, and relates to the technical field of synthesis of lubricating oil additives. The method for preparing the high-performance heavy alkyl benzene sulfonic acid barium salt by modifying the heavy alkyl benzene raw material comprises the following steps: S1, selecting narrow-fraction long-straight-chain alpha-olefin with the carbon number range of C10-C14 as an alkylating agent, and carrying out Friedel-Crafts alkylation reaction on the alkylating agent and benzene in the presence of a Lewis acid catalyst at the reaction temperature of 30-70 DEG C according to the molar ratio of the benzene to the alpha-olefin of 3: 1-8: 1; the reaction time is 1-4 hours, and after the reaction is completed, carrying out hydrolysis, layering and distillation purification; by physically mixing the narrow-fraction long-straight-chain alpha-olefin synthesized heavy alkylbenzene with regular structure and low branching degree with commercially available heavy alkylbenzene, the molecular homogeneity of the raw material is optimized, the reaction consistency and the salifying stability are improved on the premise of not changing the existing process, and the barium heavy alkylbenzene sulfonate product with better damp-heat and salt spray performance is prepared.

A lubricating oil additive composition including: (i) a Broensted acid salt of at least one first amide compound, the Broensted acid salt being a salt of the first amide compound and a Broensted acid, the first amide compound being a monoamide of at least one fatty acid (a1), and at least one amine compound (a2), the amine compound (a2) being an oligomer of at least one alkanolamine (a3) represented by the general formula (1):in the formula, n is 1 or 2; R1 is C1-4 linear chain alkylene or C3-10 branched chain alkylene, the C3-10 branched chain alkylene having a main chain, the main chain having a carbon number of 2; and when n is 2, a plurality of R1's may be the same, and may be different from each other.

The utility model relates to the field of petroleum additive production equipment, in particular to an oil-based petroleum additive diluting device which comprises a diluting tank, a lower liquid inlet pipe extending into the diluting tank is arranged at the lower end of the diluting tank, a liquid distribution disc is arranged at the upper end of the lower liquid inlet pipe, a plurality of liquid outlets are formed in the side face of the liquid distribution disc, and a conical flow guide block is arranged at the upper end of the liquid distribution disc. An upper liquid inlet pipe extending to the upper part of the diluting tank is vertically arranged above the conical flow guide block; and a liquid outlet valve is arranged at the lower end of the diluting tank. The device has the advantage of uniform dilution.

The utility model relates to the technical field of feed production, and discloses grease adding equipment for livestock and poultry feed production, which comprises a support column and a bottom block, and the bottom block is fixedly arranged above the support column; a supporting mechanism is fixedly installed above the bottom block, a hollow frame is fixedly installed above the supporting mechanism, and a first sealing ring is movably installed in one end of the hollow frame. According to the device, grease is placed in the material storage barrel after the first valve is closed, the first valve is opened to enable the grease to flow into the feeding hopper, the feeding hopper moves downwards due to weight increment and drives the downward pressing frame and the first sealing ring to move downwards, and the grease in the feeding hopper is discharged into the material receiving box. The bottom of the valve I is gradually closed, so that the cost increase caused by the damage of the electronic scale can be avoided, the working efficiency of the device is improved, and the use cost of the device is reduced. Through the technical scheme, the problems of high cost and solidification in the prior art are solved.

The application discloses a kind of quaternary ammonium mannich base, quaternary ammonium mannich base multifunctional fuel additive and its preparation method and application.The quaternary ammonium mannich base, its structural formula is as shown below:Wherein, m=10~90, preferably m=15~80;N=0~20, preferably n=2~10;R1, R2, R3 same or not same, respectively independently H or C1-C4 alkyl;R4 is H, CH3 Or C2H5;R5 is C3-C8 alkyl or aryl, preferably C3-C8 alkyl;R6 is CH3 Or C2H5;X is SO4 Or CO3.The multifunctional fuel additive comprising quaternary ammonium mannich base of the application not only has good dispersibility, has the effect of reducing the accumulation amount of vehicle engine carbon deposit, but also can effectively reduce the balance point temperature, solve diesel engine particulate filter (DPF) passive regeneration failure, reduce the number of active regeneration, prolong regeneration mileage.

The application discloses a combustion-supporting and corrosion-preventing type colloidal magnesium-based heavy oil additive and a preparation method thereof. The heavy oil additive is prepared from the following components in parts by weight: magnesium oxide 50-80 parts, bentonite 10-15 parts, lime powder 5-10 parts, nano silicon dioxide 10-15 parts, basic copper chloride 5-10 parts, diaspore powder 10-15 parts, sodium dodecyl benzene sulfonate 2-8 parts, hydrocarbon solvent 2-8 parts, combustion-supporting dispersant 2-8 parts, and water 80-100 parts. The additive can inhibit the combustion of sulfur in the heavy oil to generate sulfur oxides, low-temperature sulfur corrosion and the synergistic corrosion of HCl. In the low-temperature section, the basic components such as lime powder react with HCl to generate salt compounds, neutralize the acidic substances in the flue gas, and significantly increase the pH value to above 8, thereby preventing the low-temperature dew point corrosion of the tail heating surface.

The invention discloses a fuel additive filling device based on unpowered mechanical mixing. The fuel additive filling device comprises a base frame body, and a fuel additive storage tank is arranged on the base frame body; and a mixer is also arranged on the base frame body. The mixer comprises a main cylinder, quick coupling structures are arranged at the two ends of the main cylinder, one end serves as a fuel oil inlet and is used for being connected with an output pipeline of an oil discharging well, and the other end serves as a discharging opening and is used for being connected with an input pipeline of a storage tank for storing a fuel oil and additive mixture. A fuel additive inlet is formed in the cylinder wall of the main cylinder body, a multi-branch liquid injection pipe is arranged in the main cylinder body, and the multi-branch liquid injection pipe is communicated with the fuel additive inlet; a spiral shifting piece structure is arranged in the main barrel and located on one side of a fuel oil inlet of the multi-branch liquid injection pipe, after fuel oil enters the mixer, spiral fuel oil flow is formed under the action of the spiral shifting piece structure, and then the spiral fuel oil flow is spirally mixed with a fuel oil additive output by the multi-branch liquid injection pipe.

The invention belongs to the technical field of fuel additives and clean energy. The invention provides a fuel oil additive, which is prepared from 40 to 60 parts of fatty acid ester, 10 to 20 parts of alcohol ether compounds, 1 to 3 parts of nanometer oxides, 2 to 4 parts of surfactants, 1 to 2 parts of oxidation stabilizers, 2 to 3 parts of sodium benzoate, 1 to 2 parts of 2, 6-dimethyl pyridine, 0.5 to 1 part of metal organic catalytic combustion improvers and 20 to 30 parts of solvent oil. The fuel additive can significantly improve the fuel combustion efficiency, reduce the fuel consumption, reduce the emission of CO, HC, NOx and soot, and improve the combustion stability and storage performance. The additive selects part of bio-based raw materials, has the characteristics of energy conservation, emission reduction, greenness and low carbon, is suitable for the field of combustion-supporting modification of gasoline, diesel oil and biofuel, and has good environmental benefits and application prospects.

The present invention belongs to the field of chemical catalysis technology, and discloses a method for preparing m-methylbenzyl alcohol. The present invention provides a route and corresponding catalyst for directly producing m-methylbenzyl alcohol from low-carbon alcohol aldehydes through hydrogen transfer or dehydrogenation-coupling-aromatization reaction. The selectivity of m-methylbenzyl alcohol is as high as 47.7%, and the selectivity of m-methylbenzaldehyde is 4.6%. m-methylbenzaldehyde can be converted into m-methylbenzyl alcohol by simple hydrogenation. Mild reaction conditions avoid the generation of excessive oxidation products. The reaction route produces hydrogen as a by-product, which is a clean energy source. The route also generates high-carbon chain alcohols, which are easy to separate by distillation and can be used as fuels or oil additives. In addition, the route also generates o- and p-methylbenzyl alcohols and methylbenzaldehyde, which can be used in the fields of spices, medicine, cosmetics, pesticides, etc.

The invention relates to the technical field of lubricating oil additives, and discloses an environment-friendly additive for replacing a phosphorus-chlorine antiwear agent.The preparation method comprises the following steps that base oil is added into a reaction kettle, stirring is conducted for 15-20 min at the temperature of 50-70 DEG C at the speed of 300-600 rpm, then molybdenum oleate, modified hydrotalcite, modified eugenol and octyl dimethylbenzene are sequentially added under continuous stirring, uniform mixing is conducted, and the additive is obtained. The environment-friendly additive for replacing the phosphorus-chlorine anti-wear agent is obtained. Under high temperature and high pressure generated by friction, molybdenum oleate can be decomposed to form a molybdenum disulfide solid lubricating film with low shear strength, so that the wear resistance of the additive is enhanced; stearic acid is used for modifying hydrotalcite, so that the anti-wear effect is synergistically enhanced; an organic silicon chain segment in the modified eugenol can provide auxiliary lubrication, and polar groups are adsorbed on the metal surface, so that the corrosion resistance of the additive is improved; and the additive does not contain phosphorus, chlorine and other harmful elements, and accords with the development direction of modern green manufacturing and environment-friendly lubrication.

The invention relates to the field of lubricating oil additives, in particular to a sulfur-phosphorus-free non-toxic ester polymer lubricating oil extreme pressure anti-wear additive, which is prepared from the following components in parts by mass: 18 to 22 parts of modified epsilon-caprolactone monomer, 3.5 to 4.5 parts of 5-carboxybenzotriazole, 0.3 to 0.4 part of catalyst 4-dimethylaminopyridine and the like. According to the invention, a stable organic-inorganic hybrid system is constructed by innovatively performing molecular modification and compounding on a functional ester polymer, a heterocyclic compound and a two-dimensional nano material. Compared with the prior art, the additive has the advantages that harmful elements such as sulfur and phosphorus are completely abandoned, synergistic improvement of multiple properties such as extreme pressure antiwear, friction reduction and corrosion resistance is realized, the service life of equipment is effectively prolonged, the environmental burden is reduced, and the additive has a wide application prospect in the fields of high-end equipment manufacturing, new energy automobiles and the like with strict requirements on lubricating materials.

The invention discloses a preparation method of a ferroferric oxide nano lubricating oil additive, and belongs to the technical field of lubricating oil additives. The method comprises the following steps: firstly, dispersing ferroferric oxide nanoparticles in a solvent ethanol, and ultrasonically dispersing uniformly; secondly, adding a modifier silane coupling agent, heating and uniformly stirring; then, centrifugal washing is carried out, the unreacted modifier is removed, and lipophilic particles are obtained after drying; then mixing the modified ferroferric oxide nanoparticles with base oil and a dispersing agent, and uniformly dispersing to obtain a mixed solution; and finally, drying the mixed solution, and dispersing a solvent-removed product into base oil to obtain the nano lubricating additive. The preparation method provided by the invention has the advantages of simplicity and convenience in operation, low cost and short period. After the prepared nano lubricating additive is added into base oil, the friction coefficient can be remarkably reduced, and excellent lubricating performance is shown.

The invention relates to the technical field of diesel additives, and particularly discloses a multi-effect composite diesel additive and a preparation method thereof. The additive comprises the following components in parts by weight: 7-11 parts of an anti-wear agent, 5-8 parts of a cetane number improver, 4-6 parts of a clearing agent, 2-3 parts of an antioxidant, 3-4 parts of a solubilizer, 3-4 parts of a pour point depressant, 1-2 parts of a preservative and 4-7 parts of a multifunctional additive. The invention also provides a preparation method of the composition. All the components act together to achieve the multiple effects of improving the combustion quality, reducing emission, strengthening lubrication and the like, in addition, the prepared auxiliary agent integrates multiple functions, and the oil phase adaptability and the functional strength can be guaranteed.

This utility model belongs to the technical field of lubricating oil additive production equipment. Specifically, it discloses a reaction device for producing lubricating oil additives. The reaction tank is equipped with a stirring shaft, and the stirring shaft is fixedly connected from top to bottom with a paddle stirring blade, a double spiral stirring blade, and a turbine stirring blade. A processing box is fixedly connected to the top of the condenser, and a condenser tube is installed inside. A water pipe is sleeved on the outside of the straight part of the condenser tube, and a spiral guide plate is installed on the straight part inside. A vertically arranged reaction layer is fixedly connected in the second chamber, and several horizontally arranged activated carbon layers are fixedly connected in the first chamber. A liquid outlet pipe is fixedly connected to the bend at the lower end of the condenser tube. This utility model makes the reaction more uniform by setting three different stirring blades. By setting the condenser tube, reaction layer, and activated carbon layer, harmful gases can be purified multiple times to avoid environmental pollution.

The invention belongs to the field of lubricating oil, and particularly relates to an oil additive composition for a screw air compressor with an ultra-long oil change period and application of the oil additive composition. The additive composition comprises the following raw materials in parts by weight: 50-80 parts of an antioxidant, 1-10 parts of an anti-rust agent, 1-10 parts of an anti-wear reagent at extreme pressure, 1-10 parts of a metal deactivator and 1-3 parts of an anti-foaming agent, the antioxidant is selected from an amine type antioxidant or a mixture of the amine type antioxidant and a phenol type antioxidant. The additive composition provided by the invention shows excellent oxidation resistance, provides good anti-corrosion protection for metals, and reduces the generation of oil sludge paint films. The composition is stable and excellent in performance, provides excellent protection for continuous operation (the exhaust temperature reaches up to 200 DEG C) under severe conditions and at high temperature, has an ultra-long oil change period which is up to 24,000 hours and is three times that of conventional synthetic screw air compressor oil, and can meet the lubrication requirements of vane type and rotary screw air compressor systems.

The invention provides a graphene-based lubricating oil additive as well as a preparation method and application thereof, and belongs to the technical field of industrial pump lubrication. The graphene-based lubricating oil additive provided by the invention comprises the following components in percentage by mass: 0.6-5% of a hydroxylated graphene-nano tungsten disulfide composite material, and hydroxylated graphene and nano tungsten disulfide in the hydroxylated graphene-nano tungsten disulfide composite material form an interlayer intercalation structure; 2-8% of nano magnesium aluminum silicate; 0.3%-1.2% of porous silicon dioxide elastic particles; 1%-5% of fluorinated carbon nanotubes; 0.5-2% of a corrosion inhibitor; and the balance of base oil. The graphene-based lubricating oil additive provided by the invention is used for lubricating a water pump, has an excellent cavitation damage repairing effect, is excellent in wear resistance and friction reduction performance, is beneficial to reducing the load current of a motor and improving the energy efficiency, and also has an excellent noise reduction effect.