60 results about "Dispersit" patented technology

The invention belongs to the technical field of heat-conducting silica gel gaskets, and particularly relates to a rebounding heat-conducting silica gel gasket and a preparation method thereof.The rebounding heat-conducting silica gel gasket is prepared from, by weight, 100 parts of vinyl silicone oil; 600 to 1000 parts of a treated heat-conducting filler with a large particle size; 100 to 300 parts of small particle size spherical alumina; 10 to 30 parts of graphene slurry; 5-10 parts of hydrogen-containing silicone oil; and 0.2 to 0.5 part of a catalyst. A high-efficiency heat-conducting network is constructed through graphene, and a combination of a mixture of large-particle-size spherical aluminum nitride and spherical aluminum oxide and small-particle-size spherical aluminum oxide is combined; meanwhile, the gasket is endowed with excellent resilience through a chelating dispersant enhanced cross-linked network, surface elastic coating treatment of the large-particle-size heat-conducting filler and a synergistic effect of graphene, and excellent balance of high heat conductivity and high resilience is realized.

The invention discloses a novel mixed water-based fuel and a processing method thereof, and belongs to the technical field of fuel preparation. The novel mixed water-based fuel is prepared from the following components in percentage by weight: 30% of water, 25% of heavy aromatics, 20% of base oil, 10% of a catalyst, 10% of a dispersing agent, 3% of an environment-friendly detergent and 2% of a combustion improver. The processing method comprises the following steps: putting the purified water into a stirring container, sequentially adding the heavy aromatics, the base oil and the catalyst, and uniformly stirring; heating to 40 + / -5 DEG C, adding a dispersing agent, and stirring; and cooling, adding the combustion improver and the environment-friendly detergent, and uniformly stirring. The formula is scientific and reasonable, the synergistic effect of all the components is remarkable, and the prepared fuel system is stable, full in combustion, low in pollutant emission and outstanding in energy-saving and environment-friendly effect; the processing method is simple and easy to implement, controllable in operation and high in safety, production conditions are easy to realize, dual requirements of laboratory preparation and large-scale industrial production can be met, and the method has a good application prospect.

The application discloses a solid waste-based self-compacting super-waterproof backfill material and a preparation method thereof, and the solid waste-based self-compacting super-waterproof backfill material is formed by mixing and stirring slag and a solid waste-based high-impervious curing agent and water; the solid waste-based high-impervious curing agent comprises steel slag powder, granulated blast furnace slag, fly ash, red mud, industrial by-product gypsum, hydrophobic organic acid salt, alkali metal lactate, high-performance polycarboxylate water reducer and dispersant. Physical-chemical reactions occur in the mixing and stirring, a large amount of cementing bodies are generated in the curing process, the inter-particle pores of soil are filled, the structure is compacted, the strength is high, and the imperviousness is good; the application focuses on the solid waste resource utilization demand, has the advantages of high solid waste utilization rate, low economic cost, high fluidity, good waterproof performance and the like; and the application changes the need of adding cement clinker in traditional backfill materials, and is more economical and environment-friendly.

The present invention belongs to the field of metal surface treatment and relates to a composite boronizing agent and a solid boronizing method for oil pipes. The composite boronizing agent comprises a boronizing agent and graphite. Calculated on the basis of mass percentage, the graphite is 10-14% of the mass of the boronizing agent. The boronizing agent comprises the following raw materials in mass percentages: boron source: 10-15%, catalyst: 12-20%, activator: 8-10%, dispersant: 4-6%, filler: 50-55%, and flow aid: 8-12%, and the dispersant is triethanolamine borate. In the composite boronizing agent of the present invention, the triethanolamine borate can remove impurities from an inner surface of an oil pipe, improve the boronizing effect and boronized layer quality, and form a protective film to prevent carburization, promote boronizing, and enhance boronized layer bonding strength. In addition, through the combined action of triethanolamine borate and graphite, the boronizing agent can be prevented from agglomerating or adhering to the inner surface of the oil pipe after boronizing treatment, and the uniformity of boronizing can further be improved.

The invention discloses carboxyalkylated lignin as well as a preparation method and application thereof in coal gasification wastewater coal slurry, and belongs to the technical field of coal water slurry. The carboxyalkylated lignin with a three-dimensional structure is obtained by introducing a carboxyalkyl branched chain into a lignin structure through a graft copolymerization method. The preparation method comprises the following steps: dissolving lignin in deionized water or isopropanol, adjusting the pH value to 11-12, adding a reaction reagent with a carboxyl functional group and an alkyl chain, and reacting in a water bath at 60-80 DEG C for 2-4 hours; then adjusting the pH value to 6-7; and washing, centrifuging and purifying to obtain the carboxyalkylated lignin. Carboxyalkylated lignin is used as a dispersing agent to be applied to a system for preparing coal water slurry from coal gasification wastewater, coal particles can be fully dispersed and stabilized in a complex coal gasification wastewater system by using fewer adsorption sites, and the carboxyalkylated lignin can be used as the dispersing agent to remarkably improve the slurrying performance and long-term stability of coal gasification wastewater coal slurry.

The invention relates to the field of engine oil, in particular to long-life high-efficiency dynamic equilibrium air compressor oil and a preparation method thereof. The invention relates to long-life high-efficiency dynamic equilibrium air compressor oil, which is prepared from the following raw materials in parts by mass: 90 to 120 parts of base oil system, 1 to 2 parts of antioxidant, 2 to 6 parts of extreme pressure anti-wear agent, 0.3 to 0.6 part of metal deactivator, 0.5 to 1.5 parts of anti-rusting agent, 0.2 to 0.3 part of defoaming agent, 0.5 to 1.2 parts of purification dispersant and 3 to 8 parts of functional auxiliary agent. The finally prepared air compressor oil not only has the effects of long service life, high energy efficiency and the like, but also can keep comprehensive properties such as oxidation resistance, detergency and anti-foaming property at the same time so as to meet the increasing application requirements of air compressors.

The invention discloses a fifth-generation gasoline detergent and a preparation method and application thereof.The detergent is prepared from, by mass, 5.1%-16% of azole polynitrogen compounds with the carbon atom number being 6-12 and the nitrogen atom number being 3-6, 40.1%-48% of Mannich base detergent dispersants with the number containing C8-14, 5.1%-12% of organic acid R6-12 hydrazine catalytic auxiliaries, 1.4%-3% of antioxidants and 30%-49.5% of C8-12 straight-chain alkane. The preparation method comprises the following steps: mixing the components according to the proportion, and filtering through a 1-1.5 mu m filter screen. The additive amount of the cleaning agent is 200-220 mL / m < 3 >, sufficient combustion of gasoline can be promoted, the emission amounts of CO, HC and NOx in tail gas are reduced by 30%, 33% and 19% respectively, the fuel saving rate reaches 10.24-14.01%, the power of an engine can be improved, and an automobile is assisted to meet the strict emission standard.

The invention discloses a tin-zinc-copper powder ultrafine powder batch preparation process, and relates to the technical field of metal powder preparation, and the tin-zinc-copper powder ultrafine powder batch preparation process comprises the following steps: dissolving tin salt, zinc salt and copper salt in deionized water, adding a complexing agent, and uniformly mixing to obtain a mixed metal salt aqueous solution; dissolving a rosin-based polyamine hyperbranched dispersant in an organic solvent to serve as an oil phase; slowly adding a mixed metal salt aqueous solution into the oil phase, and uniformly dispersing to obtain a water-in-oil microemulsion system; dropwise adding a reducing agent solution, and continuously carrying out heat preservation reaction for 0.5-3 hours after dropwise adding is finished, so as to obtain slurry containing alloy particles; and carrying out demulsification treatment, centrifugal separation, repeated washing and drying to obtain the surface-modified tin-zinc-copper superfine powder. Superfining of particles is achieved through confinement growth, synchronous co-deposition of multi-component elements is guaranteed, a homogeneous alloy phase is formed, component segregation is avoided, and a protective layer formed on the surface of the powder in situ endows the material with excellent oxidation resistance and good weld-aid wettability.

The invention discloses a preparation method of modified hydrotalcite lubricating oil with high dispersion performance, and relates to the technical field of lubricating oil, the method comprises the following steps: dropwise adding an alkali solution into a salt solution to obtain a suspension; aging and separating the suspension to obtain a reaction product; the reaction product is washed, dried, ground and sieved, and the ZnMgAl LDH nanosheet is obtained; the preparation method comprises the following steps: modifying a ZnMgAl LDH nanosheet to obtain modified hydrotalcite; and adding the modified hydrotalcite into the base oil to prepare the modified hydrotalcite lubricating oil. The calcium-magnesium-aluminum hydrotalcite is subjected to surface modification through the dispersing agent, on one hand, the compatibility of the hydrotalcite and the lubricating oil base oil is enhanced through the long-chain alkane structure of oleic acid, and the dispersion problem caused by hydrophilicity of the hydrotalcite is solved; on the other hand, by means of a hexagonal layered crystal structure of hydrotalcite, a low-shear-force lubricating film is formed on a friction interface, so that the lubricating performance of the lubricating oil is synergistically improved; in addition, the modified hydrotalcite has good thermal stability at the temperature of about 230 DEG C or below, and is suitable for high-temperature use scenes of the lubricating oil.

To provide a dispersant capable of enhancing dispersibility of a carbonate-blended cement composition.SOLUTION: The present invention provides a dispersant for carbonate-blended cement compositions, such as calcium carbonate, comprising a polycarboxylic acid copolymer containing 1 to 99 wt.% of a composition unit (I) derived from a monomer represented by a general formula (1) and 1 to 99 wt.% of a composition unit (II) derived from a monomer represented by a general formula (2). It is preferable that an average particle size of the carbonate be 1.0 to 100 μm. It is preferable that a weight average molecular weight of the polycarboxylic acid copolymer be 5,000 to 100,000.SELECTED DRAWING: None

The present application relates to the field of oil and gas well cementing engineering, and particularly relates to an oil-based drilling debris cementing slurry system, a preparation method and application thereof. The oil-based drilling debris cementing slurry system includes, in terms of weight parts, cement 100 parts, oil-containing drilling debris 25-45 parts, anti-pollution agent 0.5-5 parts, density adjusting agent 0-40 parts, expansion agent 0-5 parts, early strength agent 0-5 parts, dispersing agent 0-3 parts, suspending agent 0-3 parts, fluid loss reducer 1-10 parts, and water 50-70 parts. The oil-containing drilling debris is selected from oil-extracted drilling debris with a particle size of 0.3-20 microns, and more than 90% of the particles have a particle size of less than or equal to 9.44 microns. The oil-based drilling debris cementing slurry system provided by the present application can adjust the density of the oil-based drilling debris cementing slurry system, prolong the thickening time and increase the compressive strength, thereby ensuring the long-term integrity of the cement sheath. Meanwhile, the problem of oil-containing drilling debris waste treatment is solved, and the waste oil-containing drilling debris is reused.

The invention relates to the technical field of petrochemical engineering, and particularly discloses an asphalt inhibitor and a preparation method and application thereof.According to the asphalt inhibitor, strong pi-pi conjugate interaction can be generated between aromatic rings in molecules and asphaltene aromatic lamellas, so that the molecules of a dispersing agent can be like an'anchor '; the particles are firmly adsorbed on the surfaces of asphaltene particles; a long alkyl chain of octadecyl methacrylate is a strong hydrophobic group and can be further inserted into a hydrophobic region of asphaltene through strong hydrophobic interaction, so that the asphalt inhibitor can be firmly adsorbed on the surface of the asphaltene and is not easy to desorb; a polyethylene glycol chain of polyethylene glycol methacrylate is a polar flexible long chain, after the dispersing agent is anchored on the surface of asphaltene, the flexible long chain can fully extend into a surrounding oil phase medium, asphaltene particles are effectively prevented from approaching through a steric hindrance effect, the dispersity of asphaltene is improved, and the dispersion of asphaltene is improved. The purpose of reducing the viscosity of the high-condensation-point thick oil is achieved.

The invention discloses an alcohol-soluble demulsifier and a preparation method thereof. The demulsifier is composed of a polyether polymer, an organic dispersant, a stabilizer, an auxiliary flocculant, an alcohol solvent, a surfactant and deionized water, and has excellent oil-water separation performance and storage stability. All the components are fully mixed through stirring and ultrasonic-assisted dispersion to form a uniform transparent liquid; experiments show that the stabilizer significantly prolongs the storage period of the agent, and the auxiliary flocculant effectively shortens the oil-water separation time, reduces the effluent turbidity and improves the oil sludge sedimentation rate; when the optimal formula is applied to marine oily sludge wastewater treatment, the oil-water separation time can be shortened to about 12 minutes, the effluent turbidity is lower than 50 NTU, the separated oily sludge can be directly recycled, the water is clear and transparent, and the discharge or cyclic utilization standard is met; the preparation process is simple, environment-friendly, efficient and suitable for the field of industrial wastewater treatment.

The invention belongs to the technical field of coatings, and discloses an oily matte silica gel hand feeling coating and a preparation method thereof.The coating is composed of a component A, a component B and a diluent, the component A is prepared from the following raw materials in parts by weight: 40 to 50 parts of polysiloxane, 5 to 6 parts of a curing agent, 0.1 to 0.2 part of a dispersing agent, 0.1 to 0.2 part of a silane coupling agent, 30.3 to 46.7 parts of heptane, 3 to 5 parts of a matting agent, 5 to 8 parts of particle powder and 0.1 to 0.3 part of an inhibitor; the component B is prepared from the following raw materials in parts by weight: 30-35 parts of a platinum catalyst and 65-70 parts of analytically pure ethyl acetate; the diluent is prepared from the following raw materials in parts by weight: 20 to 30 parts of heptane and 70 to 80 parts of n-butane. According to the invention, the raw materials are combined according to a proper ratio, the particle powder adopts spherical silicon dioxide ATA-60 and has the characteristics of good transparency and high hardness, and the appearance, hand feeling and weather resistance of a paint film can be considered by adding a proper amount of particle powder.

This invention discloses an oil-based phase change microcapsule suspension, comprising: base oil, dispersant, antioxidant, and phase change microcapsules. The phase change microcapsules are controlled at a preset particle size and uniformly dispersed in the base oil. Each phase change microcapsule includes at least a phase change core material and a wall material, with the wall material coating the phase change core material. The phase change core material is a material that undergoes a solid-liquid phase change at a preset critical temperature. The wall material can exchange heat with the phase change core material and also with the base oil. This invention can improve the heat exchange performance of immersed liquid cooling fluids.

The invention relates to the technical field of water-based radiation refrigeration coatings, and discloses a water-based radiation refrigeration coating composition and a preparation process thereof, the water-based radiation refrigeration coating composition comprises a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 10 to 15 parts of a water-based substrate, 8 to 12 parts of a multi-effect cosolvent, 55 to 65 parts of radiation refrigeration functional filler, 10 to 20 parts of emulsion, 0.1 to 0.8 part of a hydrophobic auxiliary agent, 0.1 to 0.8 part of a wetting agent and 0.3 to 1 part of a thickening agent, and the multi-effect cosolvent is prepared from a dispersing agent, a defoaming agent and a first solvent; and the component B comprises the following raw materials in parts by weight: 65-75 parts of a curing agent and 25-35 parts of a second solvent. The water-based radiation refrigeration coating composition has good cooling performance, weather resistance and protection performance.

The application discloses a high-temperature release agent and a preparation method thereof, and relates to the field of metal forming auxiliary materials. The release agent is composed of pure water, nano aluminum sol powder, boron nitride powder, zirconium oxide powder, water-soluble silicone oil and special additives (dispersants, wetting agents and suspending agents) and is prepared through a specific process. The release agent has a Brookfield viscosity of 900-1100 cps, a pH of 2-5, and a total proportion of boron nitride and zirconium oxide of greater than or equal to 82% after combustion, and the boron nitride and the zirconium oxide are nano-level superfine powder. The release agent is stable at a high temperature of 1300 DEG C or above, does not produce toxic by-products, is easy to wash with water, is suitable for full atmosphere, solves the problem of metal high-temperature forming demolding, improves production efficiency and quality, has environmental protection and economic value, and is suitable for forming of complex metal parts such as engine pistons.

The application discloses a kind of low temperature heat conducting oil based on ionic liquid and preparation method, including: ionic liquid eutectic component 90-98 parts by weight, cleaning dispersant 2-10 parts;Ionic liquid eutectic component is the eutectic of binary or multi-ion liquid mixture.Formed.The application has higher safety, product toxicity is small, can obtain raw material is wide, low in price;Prepared heat conducting oil thermal stability is good, freezing temperature can be as low as-100 DEG C, low temperature viscosity is small, vapor pressure is extremely low, thermal efficiency is high, and cold quantity transmission efficiency is excellent, and low temperature performance is excellent.In addition to the above performance advantages, it also has the advantages of more than 10 years of service life, not easy to coke, and can reduce pollutant emissions, energy saving and environmental protection, widely used, can also be used as ultra-low temperature electrolyte and other low temperature working fluid, etc..

The invention relates to the field of scale inhibitors, in particular to an oil slurry scale inhibitor for a catalytic cracking unit and a production process of the oil slurry scale inhibitor, which are used for solving the problems that the existing scale inhibitor is poor in scale inhibition effect and poor in high-temperature stability, and is often difficult to meet the prevention and control requirements of the oil slurry scaling problem in a high-temperature environment. The dispersing agent in the oil slurry scale inhibitor adsorbs insoluble solid particles in oil slurry to prevent the insoluble solid particles from gathering and precipitating, efficient operation of a catalytic cracking device is guaranteed, the anti-aging agent can resist free radicals generated by the oil slurry under high-temperature and oxidation conditions, the aging process of the oil slurry is slowed down, the service life of equipment is prolonged, and the oil slurry scale inhibitor is suitable for industrial production. The polycarboxylic sulfonic acid pyridine compound can form a stable chelate with inorganic salt ions in the oil slurry due to a plurality of carboxylic acid groups and sulfonic acid groups, the oil slurry scaling is effectively inhibited, the organic phosphorus silicon compound has good thermal stability under a high temperature condition, and the effect of the oil slurry scale inhibitor under an extreme working condition is enhanced.

The present application belongs to the technical field of coal chemical industry, and relates to a method for preparing needle coke by adopting a two-stage extraction process, comprising the following steps: 1) cutting the washing oil of a 230-300 DEG C fraction section and the coal tar pitch component of a >350 DEG C fraction section of a medium-low temperature coal tar by a conventional pressure reduction cutting; 2) obtaining hydrogenated tail oil by hydrogenating the medium-low temperature coal tar; and then cutting to obtain fraction oil of 230-350 DEG C; 3) two-stage extraction refining, compounding the product after the first-stage extraction of the coal tar pitch component with the fraction oil, and then performing the second-stage extraction by using the washing oil to obtain refined pitch, and cutting to obtain a >300 DEG C fraction section; and 4) thermal nucleation of the >300 DEG C fraction section and a naphthalene-based interfacial dispersant, and then performing a two-stage temperature and pressure process, calcining and cooling to obtain needle coke. By the two-stage extraction and compounding, the present application can fully remove heteroatoms and improve the efficiency of the refined pitch; and the large-basin mesophase pitch with high anisotropy content is obtained, and the needle coke with high fiber structure content is prepared.

The invention relates to the technical field of gas reservoir exploitation, and discloses a high-temperature-resistant fracturing composite capsule gel breaker and a preparation method thereof.The high-temperature-resistant fracturing composite capsule gel breaker comprises a capsule core and a capsule coating wrapping the surface of the capsule core; the capsule core is prepared from the following raw materials in parts by weight: 20-30 parts of a peroxide chemical gel breaker, 1-3 parts of a dispersing agent, 1-3 parts of an initiator and 58-78 parts of deionized water, and the capsule dressing is at least one of a capsule dressing A, a capsule dressing B or a capsule dressing C; the capsule gel breaker is uniform in particle and good in roundness, and the selected membrane material has delayed degradation and temperature resistance and water repellency; according to the slow-release gel breaker, the gel breaking time is obviously prolonged, the residue amount after gel breaking of the fracturing fluid is relatively small, gel breaking of a guanidine gel fracturing fluid system can be delayed, the method has important significance for effectively reducing damage to a low-permeability oil reservoir, and the method is simple in preparation process, high in operability and suitable for industrial production.

The application discloses a kind of flow state filling materials and preparation method thereof, flow state filling material includes the following weight parts of raw material components: argillaceous siltstone shield muck is 80-95 parts by dry weight, recycled micro powder is 5-20 parts, granulated blast furnace slag is 3-20 parts, fly ash is 1-10 parts, cement clinker is 1-10 parts, industrial byproduct gypsum is 0.2-2 parts, silica fume is 0.5-2 parts, tung oil is 1-6 parts, cellulose ether is 0.1-0.4 parts, water reducing agent is 0.1-0.7 parts, dispersing agent is 0.1-0.7, activator is 0.5-2 parts, the flow state filling material not only realizes argillaceous siltstone shield muck, recycled micro powder and other solid waste high-mixing amount resource utilization, but also has the advantages of good fluidity, low bleeding rate, short setting time, high early strength, low shrinkage and not easy to crack.

The invention discloses a shale oil reservoir integrated blocking remover and a blocking removal method, and relates to the technical field of oil exploitation. The blocking remover is prepared from the following components in parts by weight: 30-50 parts of inorganic blocking removal liquid, 10-30 parts of organic blocking removal liquid, 10-30 parts of degradable suspended gel balls and 3-10 parts of an oil-water dispersing agent. The blocking removal method comprises the steps that the inorganic blocking removal liquid serves as an agent A, the oil-water dispersing agent and the organic blocking removal liquid are evenly stirred to serve as an agent B, the degradable suspended gel balls serve as an agent C, and the agent A, the agent B and the agent C are mixed, evenly stirred and then injected into the stratum. The device has the characteristic of integrating temporary plugging, inorganic plugging removal and organic plugging removal, has the effect of plugging a crack opening during operation, does not need to consider the influence of fracturing heterogeneity of a long well section, and can also avoid the waste of plugging removal liquid of the long well section, so that the plugging removal procedure can be effectively simplified, the plugging removal efficiency can be effectively improved, and the cost is reduced. The technical problem that an existing acidification blockage removal measure is not suitable for shale oil reservoir blockage removal is solved.

The present application belongs to the field of gasoline additives for vehicles, and particularly relates to a high-efficiency composite gasoline additive and a preparation method thereof. The high-efficiency composite gasoline additive comprises the following components: a detergent 30-60%, a dispersant 10-20%, a demulsifier 1-5%, a corrosion and rust inhibitor 1-5%, and solvent oil in a residual amount. The detergent comprises Mannich base and polyether amine, and the mass ratio of the two substances is 8:9-7:5. The additive has a small injection amount, and has a good cleaning effect on both simulated intake valves and combustion chamber deposits. The additive can significantly reduce the emission of environmental gas pollutants.

The invention discloses a preparation method of a gradient pore ceramic membrane for oil-water emulsion separation, and belongs to the technical field of inorganic nonmetallic materials. According to the method, industrial solid waste red mud is used as a main raw material, bentonite is used as an auxiliary material, polyvinylpyrrolidone is added as a dispersing agent, polyvinyl alcohol is added as a binder, and the ceramic membrane with a directional gradient pore structure is prepared through the working procedures of ball-milling mixing, directional freeze-drying, solid-phase reaction sintering and the like, so that resource utilization of the red mud is effectively realized. Meanwhile, aiming at the technical bottleneck that the existing oil-water separation ceramic membrane is difficult to give consideration to high permeation flux and high oil interception rate, the directional freeze-drying process is systematically adopted for the first time, and a directional gradient pore structure suitable for oil-water emulsion separation is constructed by reasonably regulating and controlling each process parameter; the small-hole separation layer can accurately intercept oil drops, and the small-hole separation layer and the small-hole separation layer have a synergistic effect, so that an excellent oil interception effect is ensured while flux is improved. The method is environment-friendly, low in energy consumption and easy for large-scale production.

This invention discloses a composite unblocking agent for oil and gas fields and its preparation method, belonging to the field of chemical unblocking agent production technology in petrochemicals. This method aims to solve the technical problem of large batch-to-batch variations in product performance caused by the crude control of key parameters and reliance on manual experience in traditional preparation processes. The key to its technical solution lies in achieving precise preparation through step-by-step dynamic control: firstly, the chelating agent is pretreated with alkali in a first reactor while simultaneously controlling the temperature and stirring speed; then, the pretreated mixture is transferred to a second reactor, and a penetrant is added sequentially under controlled conditions to obtain a first mixture; next, a scale inhibitor and dispersant is added under controlled weight loss balance to obtain a second mixture; finally, a programmed segmented heating reaction is performed to obtain the final product. This method is mainly used for the efficient and stable preparation of a composite unblocking agent for removing inorganic scale from pipelines and equipment in oil and gas fields.

The invention provides an additive composition for gear oil of a crane reducer and a preparation method of the additive composition, and belongs to the technical field of lubricating oil. The invention aims to solve the problems of insufficient antifriction and antiwear performance, low friction film bearing capacity and poor stability of the existing gear oil under the working condition of high and low temperature wide temperature range. The composition is prepared from 0.5%-1.5% of metal xanthate, 0.5%-1.5% of ionic liquid, 0.15%-0.25% of an antioxidant, 0.1%-0.20% of an anti-rust agent, 0.015%-0.025% of an anti-foaming agent, 0.04%-0.05% of a demulsifying agent, 0.2%-0.4% of a dispersing agent and the balance of synthetic base oil with excellent high and low temperature performance. The strong adsorption characteristic of the ionic liquid in a wide temperature range is utilized, and the ionic liquid cooperates with the metal xanthate, so that a stable double-layer adsorption structure is formed on the metal surface; under the friction action, xanthate in the structure is converted into high-activity metal sulfide in situ to form a high-strength and thermal-stability nano friction reaction film with the ionic liquid, so that the lubricating property and the bearing capacity of the gear oil under extreme working conditions are remarkably improved.

The application relates to the technical field of lubricating oil additives, and discloses a diesel engine oil additive with cleaning and dispersing effects and a preparation method thereof.The diesel engine oil additive comprises the following components in parts by weight: polyisobutylene succinic anhydride-based ashless dispersant 40-60, alkyl calcium salicylate detergent 20-30, organic molybdenum anti-wear agent 5-10, antioxidant 2-5, metal deactivator 1-3, and the like.The diesel engine oil additive is prepared by compounding the polyisobutylene succinic anhydride-based ashless dispersant and the alkyl calcium salicylate detergent, and combining the organic molybdenum anti-wear agent, the antioxidant and other additives, so that the soot, the carbon deposit and the oil sludge in the diesel engine can be efficiently cleaned and dispersed, the diesel engine oil has excellent antioxidant and anti-wear properties, the service performance of the diesel engine oil can be remarkably improved, and the service life of the engine is prolonged.The preparation method is simple in process, mild in reaction condition, does not need complicated equipment and harsh reaction condition, the production cost is controllable, and the method is suitable for industrial large-scale production.