179 results about "Thiophosphoric acid" patented technology

The invention provides a composite reagent system and a chalcopyrite and sphalerite collecting method, and belongs to the technical field of mineral processing. The composite reagent system comprises a histidine derived functional group collecting agent and a black agent, and the histidine derived functional group collecting agent (containing a total sulfur ester group, a sulfydryl functional group and a side chain imidazole ring) serves as a core and is compounded with the black agent according to a specific proportion to form a target combination-synergistic interaction flotation mechanism. The histidine derivative collecting agent derives high-activity functional groups under the alkaline condition, and after sulfydryl is dissociated, stable chemical bonds are formed by the dissociated sulfydryl and metal ions on the surfaces of the chalcopyrite and the zinc sulfide. The black powder serves as an auxiliary collecting agent, and the collecting capacity of fine-grain or low-activity sulfide minerals is enhanced through chemical adsorption of dithiophosphate radicals and metal ions on the surfaces of the chalcopyrite and the sphalerite. After the two components are compounded, the selective enrichment efficiency of copper-zinc minerals in the flotation process is remarkably improved.

The invention belongs to the technical field of phosphoric acid purification, and particularly relates to a removing agent and a removing method for heavy metal cadmium in phosphoric acid. The removing agent comprises a solvent, a thiophosphoric acid trapping agent A and a thiophosphoric acid trapping agent B, wherein the thiophosphoric acid trapping agent A and the thiophosphoric acid trapping agent B are dispersed in the solvent; the thiophosphoric acid trapping agent A and the thiophosphoric acid trapping agent B are different types of thiophosphoric acid trapping agents and are respectively and independently selected from one of alkyl dithiophosphoric acid or salts thereof, phenolic dithiophosphoric acid or salts thereof and amino dithiophosphoric acid or salts thereof; and at least one hydrocarbyl dithiophosphoric acid or salt thereof is selected; the salt is sodium salt or ammonium salt; the solvent is water or an alkaline aqueous solution. According to the method, a composition of a dithiophosphoric acid trapping agent is used as a removing agent for cadmium in wet-process phosphoric acid, a precipitate which is insoluble in a strongly acidic water phase is generated after reaction, and phosphoric acid cadmium removal is realized after filtration. Compared with a conventional sulfide precipitation method, the method provided by the invention has the advantages of less cadmium residue in phosphoric acid and less pollution.

Provided herein are compositions and methods for removing / recovering heavy metal ions in a phosphoric acid-containing stream by mixing a dialkyldithiophosphate compound having at least one alkyl chain length of C8 to C18, a dialkyldithiophosphate compound having at least one alkyl chain length of C8 to C18, and a dialkyldithiophosphate compound having at least one alkyl chain length of C18 to C18, reagents of at least one dialkyldithiophosphinate compound and at least one surfactant are added to a phosphoric acid solution or slurry to form heavy metal ion complexes, and the heavy metal ion complexes are separated from the solution or slurry.

Disclosed is a method for removing heavy metal ions from a phosphoric acid containing stream, the method may include: adding a diluted solution of a dialkyldithiophosphate compound having an alkyl chain length ranging from 8 to 12 carbon atoms to the phosphoric acid containing stream to form a heavy metal ion complex; and separating the heavy metal ion complexes from the phosphoric acid containing stream.

The invention discloses an epoxy resin-based fireproof heat-insulating coating as well as a preparation method and application thereof, and relates to the technical field of fireproof coatings. The epoxy resin-based fireproof heat-insulating coating prepared by the invention comprises an epoxy resin base material and modified ammonium polyphosphate, the epoxy resin base material is prepared by reacting epoxy resin with a hyperbranched block copolymer; hydroxyl hyperbranched polyethylene is used as an initiator and is subjected to chain extension with dihydroxyl-terminated poly (p-dioxanone) under the action of organic alkali, and thiophosphate triphenyl isocyanate is introduced, so that a hyperbranched block copolymer and epoxy resin form a stable cross-linked structure, the flame retardant property is improved, the thermal stability is ensured, and the flame retardant property is improved. The modified ammonium polyphosphate is prepared by coating the surface of ammonium polyphosphate with polyaldehyde polyester and polyamino polyether, so that the flame retardance and adhesive force of the coating are further improved.

The invention discloses a flame-retardant B1-grade sheath material and application thereof in cables, and relates to the technical field of high polymer materials. Comprising the following raw materials in parts by weight: 40-50 parts of an ethylene-vinyl acetate copolymer, 10-20 parts of an ethylene-vinyl alcohol copolymer, 10-20 parts of a functional hyperbranched polymer, 30-40 parts of a metal organic framework modified composite flame retardant, 3-5 parts of a compatilizer, 0.8-1.2 parts of an antioxidant and 0.4-0.6 part of a lubricant. The functional hyperbranched polymer comprises structural units introduced by the following monomers: triphenyl isocyanate thiophosphate and N-[(4-methyl-1H-benzotriazole-1-yl) methyl] diethanol amine. The material is high in tensile strength, sufficient in thermal shock resistance and excellent in aging resistance and flame retardance.

This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a viscosity KV100 of less than or equal to 12 cSt and included at greater than 50 wt. % of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) an overbased magnesium containing detergent comprising an overbased magnesium salicylate, an overbased magnesium sulfonate, an overbased magnesium phenate, or combinations thereof with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total magnesium; iii) an overbased metal-containing detergent comprising an overbased metal salicylate detergent, an overbased metal phenate detergent, or combinations thereof with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total metal; and wherein the overbased magnesium containing detergent of ii) and the overbased metal-containing detergent of iii) in combination deliver between 0.15 wt. % to 8.0 wt. % of total soap to the composition; iv) at least one zinc dihydrocarbyl dithiophosphate compound included at a treat level to deliver more than 100 ppm by weight of zinc and less than 800 ppm by weight of phosphorus to the composition; v) at least one molybdenum containing compound included at a treat level to deliver between 20 to 2000 ppm by weight of total molybdenum to the composition; vi) at least one silicon containing compound included at a treat level to deliver between 5 to 1000 ppm by weight of total silicon to the composition; and vii) the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt. %, a total phosphorous level of less than or equal to 800 ppm by weight and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are a lubricating oil composition and a concentrate for use in a HICE to reduce the propensity for abnormal combustion events.

This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a viscosity KV100 of less than or equal to 12 cSt and included at greater than 50 wt.% of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) an overbased magnesium containing detergent comprising an overbased magnesium salicylate, an overbased magnesium sulfonate, an overbased magnesium phenate, or combinations thereof with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total magnesium; iii) an overbased metal-containing detergent comprising an overbased metal salicylate detergent, an overbased metal phenate detergent, or combinations thereof with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total metal; and wherein the overbased magnesium containing detergent of ii) and the overbased metal- containing detergent of iii) in combination deliver between 0.15 wt. % to 8.0 wt. % of total soap to the composition; iv) at least one zinc dihydrocarbyl dithiophosphate compound included at a treat level to deliver more than 100 ppm by weight of zinc and less than 800 ppm by weight of phosphorus to the composition; v) at least one molybdenum containing compound included at a treat level to deliver between 20 to 2000 ppm by weight of total molybdenum to the composition; vi) at least one silicon containing compound included at a treat level to deliver between 5 to 1000 ppm by weight of total silicon to the composition; and vii) the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt.%, a total phosphorous level of less than or equal to 800 ppm by weight and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are a lubricating oil composition and a concentrate for use in a HICE to reduce the propensity for abnormal combustion events.

The present invention relates to 5′-morpholino amidite monomers as 5′-CE / 5′-tBu phosphoramidite morpholino monomers (2) and process chemistry for the efficient synthesis of N-Trityl or monomethoxytrityl (MMTr)-protected 5′-morpholino amidite monomers and their use in the synthesis of phosphorodiamidate morpholino oligonucleotides (PMO), thiophosphoramidate morpholino oligonucleotides (TMO) and their chimeras which can be used for antisense technology or in general oligonucleotides related research.

The present application belongs to the technical field of phosphoric acid purification, and particularly relates to a heavy metal cadmium removal agent and a removal method for phosphoric acid. The removal agent comprises a solvent and a thiophosphoric acid type capturing agent A and a thiophosphoric acid type capturing agent B dispersed in the solvent; the thiophosphoric acid type capturing agent A and the thiophosphoric acid type capturing agent B are different types of thiophosphoric acid type capturing agents, the thiophosphoric acid type capturing agent A and the thiophosphoric acid type capturing agent B are independently selected from one of a hydrocarbyl dithiophosphoric acid or a salt thereof, a phenolic dithiophosphoric acid or a salt thereof, and an amine dithiophosphoric acid or a salt thereof, and at least one hydrocarbyl dithiophosphoric acid or a salt thereof is selected; the salt is a sodium salt or an ammonium salt; and the solvent is water or an alkaline aqueous solution. The present application uses a combination of dithiophosphoric acid type capturing agents as a cadmium removal agent for wet-process phosphoric acid, and generates a precipitate that is difficult to dissolve in a strong acidic aqueous phase after reaction, so that the cadmium in the phosphoric acid is removed after filtration. Compared with the conventional sulfide precipitation method, the present application has less cadmium residue and less pollution in the phosphoric acid.

The invention provides a gas engine lubricating oil composition and a preparation method thereof. The gas engine lubricating oil composition of the present invention comprises: (A) an alkyl phosphate compound; (B) alkylated diphenylamine; (C) a polyisobutylene succinic acid pentaerythritol ester dispersing agent; (D) a salicylate and / or sulfonate; (E) zinc dialkyl dithiophosphate; (F) an oil-soluble organic molybdenum friction modifier; (G) a metal corrosion inhibitor; (H) a pour point depressant; (I) a major amount of a lubricating base oil. The gas engine lubricating oil composition disclosed by the invention has excellent high-temperature oxidation resistance, cleaning performance, extreme pressure anti-wear performance and anti-corrosion performance.

The embodiment of the specification provides a modification identification method of a thio-phosphorylated nucleic acid sequence, which comprises: performing enzymolysis on a to-be-identified nucleic acid sequence by using a nucleic acid mixed enzyme to obtain an enzymolysis product; performing secondary mass spectrum analysis on the enzymolysis product based on first mass spectrum information; and determining whether a target sequence fragment exists in the to-be-identified nucleic acid sequence based on the first mass spectrum information and the second mass spectrum information. At least the to-be-identified nucleic acid sequence modified by thio-phosphorylation is actually obtained based on a preset modification rule. The first mass spectrum information comprises a theoretical analysis result generated by analyzing a theoretical sequence fragment, and the theoretical sequence fragment is determined based on the preset modification rule, the to-be-identified nucleic acid sequence and the nucleic acid mixed enzyme. The modification identification method can accurately and efficiently identify the chemical modification of the thio-phosphorylated nucleic acid sequence.

The invention discloses a generalized pustular psoriasis diagnosis marker based on metabonomics and application of the generalized pustular psoriasis diagnosis marker. The diagnostic marker is prepared from one or more of the following 35 compounds: pyruvic acid, alpha-ketoisovaleric acid, 2-hydroxybutyric acid, 3-hydroxybutyric acid, methane thiophosphoric acid, proline, uracil, tranexamic acid, 4-aminobutyric acid, threonine, scopoletin, dodecanol, N-methyl-L-leucine, L-cysteine-glycine and L-kynurenine. The feed additive is prepared from the following raw materials: 3-hydroxybenzoic acid, allantoin, delta-tocopherol, xylofuranose, glucose-1-phosphoric acid, pyrophosphate, taurine, L-asparagine, phthalic acid, 4-(dimethylamino) azobenzene, 5-tert-butyl-1h-indole-2, 3-dione, quinic acid, glucose, histidine, lysine, palmitic acid, 7-methylguanine, oleic acid and whale acid. The marker can be used for accurately distinguishing patients with generalized pustular psoriasis from healthy people.

The disclosed technology relates to a lubricant composition for automotive gears, axles and bearings, the lubricant composition containing an oil of lubricating viscosity and a metal thiophosphate compound, such as zinc dialkyldithiophosphate, as well as a method of obtaining extreme pressure performance in automotive gears, axles and bearings at lower sulfur content than is typical, by lubricating such automotive gears, axles and bearings with a lubricant composition containing a metal thiophosphate compound, such as zinc dialkyldithiophosphate.

This invention belongs to the field of mineral flotation technology, and discloses a flotation collector for non-ferrous metal sulfide ores, its preparation method, and its application. The collector uses O,O-dialkyldithiophosphate as a starting material, and reacts sequentially with a halocarboxylic acid ester, hydrazine hydrate, potassium hydroxide, and carbon disulfide in anhydrous ethanol in a three-step reaction to obtain the target product, O,O-dialkyldithiophosphate hydrazide-N′-dithiocarbamate potassium. Its molecular structure simultaneously contains three active groups: a dithiophosphate group, an hydrazide group, and a dithiocarbamate group. This invention achieves efficient process connection and smooth transition by optimizing the material ratio, temperature, and time of each reaction step, and has advantages such as mild reaction conditions, simple operation, few side reactions, high yield, and stable product. The prepared collector exhibits excellent collecting performance and good selectivity for non-ferrous metal sulfide ores such as chalcopyrite, and is suitable for widespread application in sulfide ore flotation processes.

The invention relates to the technical field of biological medicines, and particularly discloses synthesis and application of oligonucleotide with a spacer group embedded between 5-terminal oxygen and thiophosphoric acid. The chemical modification strategy comprises the following steps: preparing a modified nucleotide phosphoramidite monomer in which a spacer group is embedded between O5'and thiophosphoric acid P (V); performing solid-phase synthesis on the modified nucleotide phosphoramidite monomer to construct a target oligonucleotide molecule; a spacer group is embedded between oxygen at the 5 '-terminal of the oligonucleotide and thiophosphoric acid P (V) to form a 5'-terminal thiophosphoric acid structure; as the terminal modified thiophosphoric acid belongs to a non-phosphatase substrate, the terminal modified thiophosphoric acid can resist exonuclease degradation and improve the biological activity of siRNA after being modified.

The invention relates to the field of lubrication of ball screws, in particular to long-life creep-resistant lubricating grease for a high-precision ball screw, which comprises the following components in parts by weight: 65 parts of polyolefin, 5-10 parts of pentaerythritol ester, 5-10 parts of isocyanate, 2-5 parts of amine chain extender, 5 parts of PTFE (polytetrafluoroethylene), 1.0-1.5 parts of diphenylamine, 0.1-0.5 part of 2, 4-diphenyl-1, 3-pentanediol monoisobutyrate, 0.1-0.5 part of antioxidant, 0.1-0.5 part of antioxidant and 0.1-0.5 part of lubricant. The composite material is prepared from the following components in parts by weight: 0.5 to 1 part of 2, 6-butylated hydroxytoluene, 1.5 to 2 parts of molybdenum isocaprylate, 0.5 to 1 part of molybdenum bis (2-ethylhexyl) dithiocarbamate, 1 to 2 parts of zinc dialkyl dithiophosphate, 3 parts of calcium petroleum sulfonate, 1 to 1.5 parts of polyisobutene, 0.2 to 0.5 part of benzotriazole and 0.1 to 0.3 part of polymethacrylate. The isocyanate comprises HDI and IPDI, and the amine chain extender comprises TETA and TEPA. According to the invention, isocyanate and the amine chain extender react to form a polyurea macromolecular chain, and a high-energy hydrogen bond network is formed, so that the lubricating grease has relatively high creep resistance; the anti-creep performance is further enhanced through cooperation with the PTFE particles; meanwhile, through cooperation with diphenylamine, the oxidation resistance is promoted, the consumption is reduced, and the service life of the lubricating grease is longer.

The invention relates to the field of lubricating oil, in particular to a compressor oil composition which is prepared from the following components in parts by weight: 0.005 to 0.2 part of an anti-rust agent, 0.05 to 1 part of an extreme pressure anti-wear agent, 0.01 to 0.5 part of a friction reducing agent, 3 to 8 parts of synthetic ester, 0.01 to 1 part of an antioxidant, 0.001 to 0.1 part of an anti-foaming agent and 90 to 97 parts of base oil. The anti-friction agent is a trimethylolpropane-triacid ester derivative, the anti-rust agent is formed by mixing an alkenyl succinic acid half-ester derivative and a carboxyl imidazoline derivative, and the anti-wear reagent at extreme pressure is formed by mixing triphenyl phosphate and an alkyl thiophosphate derivative. The antioxidant is formed by mixing any two of alkyl diphenylamine, alkyl phenyl-alpha-naphthylamine and alkyl hindered phenol. The invention further relates to a preparation method of the compressor oil composition. The compressor oil composition provided by the invention has excellent washing resistance and rust resistance.

This invention proposes a composite foaming agent, a foam drilling fluid, its preparation method, and its application. The composite foaming agent of this invention comprises a first foaming agent of zinc dialkyl thiophosphate (ZDDP) and a second foaming agent of alkyl sulfate, and water. The foam drilling fluid of this invention contains 0.3wt% to 0.8wt% composite foaming agent, 0.2wt% to 0.5wt% foam stabilizer, 1.5wt% to 3.0wt% filtration loss reducer, and the balance being water. The foam drilling fluid has a foam half-life of up to 240 min, a temperature resistance of up to 150℃, and an API filtration loss of ≤12 mL, which is significantly higher than the performance of foam drilling fluids prepared with conventional foaming agents.

The application relates to a method for producing polarized smerons by regulating copper indium thiophosphate through an electric field and application thereof, and the method comprises the following steps: preparing copper indium thiophosphate by a chemical vapor transport method, the molecular formula of the copper indium thiophosphate is Cu 1‑ x InP2S6, 0.28 > x >= 0.15, and the copper indium thiophosphate has ferroelectric domains; the copper indinium thiophosphate is prepared into a nanometer film through a mechanical stripping technology; the nanometer film is placed on the surface of a substrate through a dry transfer technology; a piezoelectric response force microscope technology is used, a voltage is applied on the surface of the nanometer film through a needle tip to form an electric field, the ferroelectric domains are converted into polarized smerons, the direction of the electric field is perpendicular to the nanometer film, and the nanometer film points to the needle tip, and the intensity is 20V / mu.m-40V / mu.m. The method can effectively regulate the conversion of the ferroelectric domains into the polarized smerons without affecting the crystal lattice structure and the morphology of the copper indium thiophosphate.

The application belongs to the technical field of cutting oil, and specifically provides a kind of composite cutting oil and a preparation method thereof.A kind of composite cutting oil uses coconut oil, mineral oil, poly-alpha olefin as mixed base oil, adds specific amount of rust preventive, polyethylene glycol, nano molybdenum disulfide, antioxidant, dispersant and composite additive obtained by chemical combination of carboxylated multi-walled carbon nanotube surface and thiophosphate amine salt, etc., through the synergistic effect of multiple components, the prepared cutting oil has excellent lubricity, extreme pressure and wear resistance, and is suitable for severe extreme pressure cutting environment.

A process for removing impurity metal ions from an acidic metal sulfate containing stream by adding an effective amount of a reagent, comprising at least one dialkyldithiophosphate compound with the alkyl chain length of C1 to C8 to the acidic metal sulfate containing stream to form impurity metal ion complexes; and separating the impurity metal ion complexes from the acidic metal sulfate stream.

The invention discloses a zinc thiophosphate material with a yolk double-shell structure as well as a preparation method and application thereof, and relates to the technical field of sodium ion batteries. The preparation method comprises the following steps: firstly, preparing a ZIF-8 precursor template through a zinc source and solvothermal reaction of 2-methylimidazole, and then sequentially carrying out coating, template etching, synchronous carbonization and vulcanization treatment and phosphorus vulcanization treatment on the ZIF-8 precursor template to finally obtain the ZnPS3 / NC-C material with the yolk double-shell structure and excellent electrochemical performance. Compared with a traditional transition metal thiophosphate preparation process, the method is safer in process, and the yolk double-shell morphology of the metal phosphorus sulfide can be accurately regulated and controlled. Compared with pure zinc thiophosphate prepared by a traditional process, the prepared ZnPS3 / NC-C material with the yolk double-shell structure has the characteristics of hollow and porous characteristics, high specific surface area and structural stability, and shows relatively high first charge-discharge efficiency and excellent cycle stability when being used as a sodium-ion battery negative electrode material.

A working oil composition for shock absorbers, which contains the following components (A) and (B): (A) an ester base oil having a pour point of-45 DEG C or less and a 10% distillation temperature of 300 DEG C or more as determined by the gas chromatography distillation test method specified in JIS K 2254: 1998; and (B) zinc dialkyl dithiophosphate.

The invention discloses a generalized pustular psoriasis diagnosis marker based on metabonomics and application of the generalized pustular psoriasis diagnosis marker. The diagnostic marker is prepared from one or more of the following 35 compounds: pyruvic acid, alpha-ketoisovaleric acid, 2-hydroxybutyric acid, 3-hydroxybutyric acid, methane thiophosphoric acid, proline, uracil, tranexamic acid, 4-aminobutyric acid, threonine, scopoletin, dodecanol, N-methyl-L-leucine, L-cysteine-glycine and L-kynurenine. The feed additive is prepared from the following raw materials: 3-hydroxybenzoic acid, allantoin, delta-tocopherol, xylofuranose, glucose-1-phosphoric acid, pyrophosphate, taurine, L-asparagine, phthalic acid, 4-(dimethylamino) azobenzene, 5-tert-butyl-1h-indole-2, 3-dione, quinic acid, glucose, histidine, lysine, palmitic acid, 7-methylguanine, oleic acid and whale acid. The marker can be used for accurately distinguishing patients with generalized pustular psoriasis from healthy people.

The invention belongs to the technical field of organic synthesis, and particularly relates to a beta-carbonyl dithiophosphate compound as well as a preparation method and application thereof. Under electrochemical reaction conditions, styrene, P4S10 and alcohol which are cheap and easy to obtain are used as raw materials, tetrabutylammonium tetrafluoroborate (nBu4NBF4) is used as an electrolyte, acetonitrile (CH3CN) is used as a solvent, and the beta-carbonyl dithiophosphate compound is prepared at room temperature in an air atmosphere. Compared with a previously reported preparation method, the method has the advantages of being green, environmentally friendly, safe, efficient and energy-saving, raw materials are easy to obtain, operation is easy and convenient, and potential industrial application prospects are achieved.

The invention provides a recyclable metal pickling corrosion accelerant and application thereof, and belongs to the technical field of metal corrosion. The O, O '-di (n-propyl) diethylammonium dithiophosphate can be combined with different inorganic acids, has different corrosion effects on low-carbon steel after being combined, can generate different use effects inevitably after being reasonably mixed with different inorganic acids, and can be suitable for scenes with different corrosion requirements. Experiments show that when the O, O '-di (n-propyl) diethylammonium dithiophosphate is combined with hydrochloric acid, the corrosion promotion rate of the O, O'-di (n-propyl) diethylammonium dithiophosphate to low-carbon steel is maximum and can reach 758.42%; and when only the type of the inorganic acid is changed, the corrosion promotion effect on the low-carbon steel is the best after the inorganic acid is combined with sulfuric acid.

The invention belongs to the technical field of protective agents, and particularly relates to a protective agent for a turbocharged engine and a preparation method of the protective agent. The protective agent for the turbocharged engine comprises the following raw materials in parts by mass: 85-90 parts of base oil, 5-8 parts of graphite powder, 0.5-2 parts of oxymolybdenum dialkyldithiophosphate, 3-5 parts of an auxiliary agent, 4-6 parts of a dispersing agent, 1-2 parts of an antioxidant and 2-4 parts of a thickening agent. According to the protective agent for the turbocharged engine, the maximum non-seizure load and the maximum sintering load of engine lubricating oil can be improved, meanwhile, the abrasion resistance is improved, and meanwhile, the stability is high.

The present invention provides a gasoline engine lubricating oil composition comprising the following components: (A) an organophosphorus compound, accounting for 0.05% to 10% of the total mass of the composition; (B) an alkyldiphenylamine, accounting for 0.05% to 5% of the total mass of the composition; (C) polyisobutylene succinimide, accounting for 2% to 30% of the total mass of the composition; (D) a sulfonate and / or a sulfurized alkylphenol, accounting for 0.2% to 10% of the total mass of the composition; (E) a zinc dialkyl dithiophosphate, accounting for 0.2% to 10% of the total mass of the composition; (F) an organomolybdenum, accounting for 0.05% to 5% of the total mass of the composition; (G) an ethylene-propylene copolymer, accounting for 2% to 30% of the total mass of the composition; and (H) a major amount of a lubricating oil base oil. The structure of the organophosphorus compound is described in the specification. The gasoline engine lubricating oil composition of the present invention has excellent anti-wear, friction-reducing, antioxidant, and detergency properties, and can inhibit the formation of deposits in turbochargers.

The invention discloses a graphene composite lubricating additive as well as a preparation method and application thereof, and belongs to the technical field of lubricating additive preparation. Modified graphene, nano molybdenum disulfide, a dispersing agent and thiophosphate amine salt are mixed and react to obtain the graphene composite lubricating additive. According to the invention, a triple synergistic stabilization mechanism of chemical anchoring, physical blocking and steric hindrance is utilized, so that the compatibility of graphene and base oil is improved, and the dispersion stability of the graphene composite lubricating additive is improved. Meanwhile, the prepared graphene composite lubricating additive can reduce the temperature of a friction pair, can form a friction reaction film containing C, Mo, P and O elements on the surface of the friction pair, reduces friction wear, shows good friction reduction and wear resistance, provides a theoretical basis and technical support for development of high-performance lubricating oil additives and application of high-temperature working conditions, and has wide application prospects. And the high-temperature lubrication problem of the marine diesel engine is solved, and remarkable engineering value and application prospects are achieved.