38 results about "Diphenyl sulfide" patented technology

The invention discloses a 4, 4 '-bis (omega-alkenyl thioether) diphenyl sulfide monomer and a preparation method, the structural general formula of the 4, 4'-bis (omega-alkenyl thioether) diphenyl sulfide monomer is shown in the specification, n represents the number of methylene and is a positive integer, n = 1-10, the refractive index of a polymer obtained after the monomer and 4 '4-dimercapto diphenyl sulfide are polymerized is larger than 1.65 and smaller than 1.8, diffraction efficiency is remarkably improved, the preparation method is easy to operate, and the preparation method is suitable for industrial production. The invention further provides a photopolymer type holographic recording medium containing the monomer and a preparation method of the photopolymer type holographic recording medium, the sensitivity of the holographic recording medium is larger than 100 cm / mJ, the diffraction efficiency of a recording grating is larger than 95%, the refractive index modulation degree is larger than 0.1, the shrinkage rate is lower than 1%, and the preparation method is simple, controllable and suitable for industrial production. The invention also provides a volume holographic grating containing the holographic recording medium, a holographic optical element and an optical device.

The invention belongs to the technical field of pesticides, and relates to a pesticide composition containing a diphenyl sulfide compound and application of the pesticide composition. The pesticide composition containing the diphenyl sulfide compound comprises an active component A and an active component B, the active component A is a diphenyl sulfide compound, and the active component B is any one or more insecticidal and acaricidal agents: B1 heterocycles, B2 tetronic acids, B3 benzoylacetonitrile, B4 oxazoles, B5 pyrazole amides and the like. The pesticide composition can effectively prevent and control multiple phytophagous pest mites, has a synergistic effect in a certain proportion range, and can enlarge the mite killing spectrum, reduce the use cost, reduce the dosage, prolong the lasting period and delay the development of drug resistance.

This invention discloses a method for preparing diphenyl sulfide compounds from arylsulfonyl chlorides, comprising the following steps: using a sulfonyl chloride compound as shown in formula (I) as a raw material, adding a catalyst, ligand, additive, base, and solvent to a reactor, and reacting under a nitrogen atmosphere to obtain a diphenyl sulfide compound as shown in formula (II). The reaction equation is as follows: wherein the H on the benzene ring is substituted or not substituted by a substituent R, and when substituted, R is fluorine, chlorine, bromine, methyl, tert-butyl, or trifluoromethyl. This invention provides mild reaction conditions, uses inexpensive and readily available raw materials, and efficiently promotes the preparation of sulfide compounds.

The invention belongs to the field of agricultural acaricides. In particular to a biphenyl thioether (sulfoxide) compound and application thereof. The structure is shown as a general formula I, wherein each substituent group in the formula is defined in the specification. The compound as shown in the general formula I has excellent acaricidal activity and can be used for preventing and treating various pest mites.

The invention discloses a synthesis method of a high-abundance C-13 ethylene oxide compound, which comprises the following steps: (1) carrying out reaction on 13CH3I and diphenyl sulfide to obtain [13C] diphenylmethyl iodide; and (2) reacting the [13C] diphenylmethyl iodide with a carbonyl compound to obtain the high-abundance [13C] ethylene oxide compound. Diphenyl sulfide is adopted to replace dimethyl sulfide, the obtained [13C] methyl diphenyl sulfonium iodide avoids C-13 loss in the subsequent reaction process, and the abundance of C-13 is effectively improved.

The present invention provides a phosphite bidentate phosphine ligand having the following structure: wherein X 1 is oxygen or sulfur, R 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 、R 8 、R 9 、R 10 、R 11 、R 12 、R 13 、R 14 、R 15 、R 16 、R 17 、R 18 、R 19 、R 20 、R 21 、R 22 、R 23 and R 24 Each is independently selected from hydrogen, halogen, substituted or unsubstituted C1-C30 alkyl, and substituted or unsubstituted C6-C30 aryl. The above-mentioned phosphite bidentate phosphine ligand provided by the present invention has a special structural fragment of diphenyl ether or diphenyl sulfide, in which the unique oxygen or sulfur can enhance the catalytic activity of the bidentate phosphine ligand and also make the coordination between it and the catalytically active metal more stable, thereby improving the structural stability of the catalyst system including the ligand and enhancing the catalytic effect.

The application discloses a battery pack fireproof and heat-insulating coating and a preparation method thereof, and relates to the technical field of fireproof coatings. The battery pack fireproof and heat-insulating coating prepared by the application comprises a composite flame-retardant charring agent, modified phenolic resin, fillers, a silane coupling agent and a defoaming agent. The modified phenolic resin is prepared by the reaction of double-end hydroxyl polyphenyl ether, amino-phenolic resin and polythioacetal. The double-end hydroxyl polyphenyl ether is prepared by the reaction of 2,6-dimethylphenol and tetramethyl bisphenol A. The polythioacetal is prepared by the polymerization of 1,3-dimercapto-2-propanol and cinnamaldehyde. The thermal stability is improved, and the coating has the ability of self-repairing. The composite flame-retardant charring agent is prepared by the reaction of a sulfonamide piperazine compound, 4,4'-dimercaptodiphenyl sulfide and diamino diphenyl methane modified ammonium polyphosphate. The sulfonamide piperazine compound is prepared by the reaction of chlorosulfonyl isocyanate and piperazine, and then the reaction with chloroacetyl chloride. The carbonization property and thermal stability of the coating are improved.

The invention belongs to the field of agricultural acaricides. In particular to a biphenyl thioether (sulfoxide) compound and application thereof. The structure is shown as a general formula I, wherein each substituent group in the formula is defined in the specification. The compound as shown in the general formula I has excellent acaricidal activity and can be used for preventing and treating various pest mites.

The embodiment of the application provides a sulfur-containing polymer electrolyte and a preparation method thereof, relates to the technical field of supercapacitors, and the preparation method comprises the following steps: mixing double-hydroxyl-terminated polyether sulfone, 4,4'-dimercaptodiphenyl sulfide and an N,N-dimethylformamide solution, the N,N-dimethylformamide solution comprising an electrolyte salt and N,N-dimethylformamide, and stirring at a constant temperature under the protection of an inert atmosphere to generate a monomer mixture; adding terephthaloyl chloride to the monomer mixture to perform a polycondensation reaction, so as to obtain a prepolymer solution; heating the prepolymer solution to perform a post-polymerization reaction, cooling the prepolymer solution to room temperature, adding trimethylolpropane triacrylate and a photoinitiator and uniformly dispersing, so as to obtain a mixed system; performing a cross-linking reaction on the mixed system under ultraviolet light irradiation, so as to form a three-dimensionally cross-linked sulfur-containing polymer electrolyte film; and performing drying treatment on the sulfur-containing polymer electrolyte film, so as to remove residual solvents and obtain a target sulfur-containing polymer electrolyte.

The invention relates to the technical field of polymer synthesis, in particular to polyarylether containing pyridine groups and thioether groups as well as a preparation method and application of the polyarylether. A pyridine-containing bisphenol monomer, a 4, 4 '-dihydroxy diphenyl sulfide monomer and a dihalo monomer X-Ar-X are used as raw materials, alkali, alkali metal or salt of alkaline earth metal is used as a catalyst, and solution polycondensation is carried out in an aprotic polar solvent to prepare the pyridine-containing dihydroxy diphenyl sulfide. The diphenyl sulfide structure in the molecular chain of the obtained polymer endows the molecular chain with flexibility, the regularity of the molecular chain can be improved, crystallization is more facilitated to obtain a partially crystallized polymer, the limitation of pyridyl-containing agglomerated arylether on application is overcome, swelling of water or a solvent and the like on a membrane can be effectively inhibited, and the polymer has good application prospects. Particularly, the adverse effect of poor membrane stability caused by high swelling of the membrane due to water when the membrane serves as an ion exchange membrane to be applied to a flow battery is avoided. And the polyarylether containing the pyridine group and the thioether group can provide potential thioether crosslinking points with accurate and controllable quantity, so that the swelling resistance and the chemical stability of the membrane material are improved.

The present application relates to the technical field of epoxy encapsulation material, and particularly relates to a low-stress and low-hygroscopicity epoxy resin composition and application thereof. The low-stress and low-hygroscopicity epoxy resin composition is prepared from the following components: epoxy resin, phenolic resin, inorganic filler, colorant, release agent, curing accelerator, ion capture agent and coupling agent; the epoxy resin is composed of o-cresol formaldehyde type epoxy resin and branched diphenyl sulfide epoxy resin, wherein the branched diphenyl sulfide epoxy resin is obtained by crosslinking 4,4'-dihydroxydiphenyl sulfide, inositol and epichlorohydrin; by adding the branched diphenyl sulfide epoxy resin in the epoxy resin composition, the mechanical properties and water absorption of the epoxy resin composition are significantly improved, thereby improving the stability and reliability of the product, and the epoxy resin composition can be used for packaging of small and thin integrated circuits.

The invention relates to a method for preparing fenbendazole by taking m-dichlorobenzene as a raw material. The method comprises the following steps: nitrating m-dichlorobenzene to obtain 1, 3-dichloro-4-nitrobenzene; the 4-chloro-3-nitrodiphenyl sulfide reacts with thiophenol salt to obtain 4-chloro-3-nitrodiphenyl sulfide; reacting with ammonia to obtain 4-amino-3-nitrodiphenyl sulfide; reducing to obtain 3, 4-diaminodiphenyl sulfide; and finally, cyclizing with methyl cyanate to obtain benthioimidazole. The method has the advantages that cheap m-dichlorobenzene is used as a starting raw material, benzenethiol is efficiently synthesized through nitration, thiophenol substitution, ammoniation, reduction and cyclization reaction, the defect that expensive or difficult-to-obtain raw materials are used in the prior art is avoided, and the method is novel in route, simple and convenient to operate, mild in reaction condition, high in total yield and suitable for industrial production.

The invention belongs to the technical field of pesticides, and relates to a pyridaben-containing acaricidal composition and application thereof, the acaricidal composition comprises an active component A and an active component B, the active component A is pyridaben, and the active component B is a biphenyl sulfide compound. The acaricidal composition can prevent and treat various pest mites, has a synergistic effect in a certain proportion range, and can enlarge the acaricidal spectrum, reduce the use cost, reduce the dosage, prolong the lasting period and delay the development of drug resistance.

The application discloses a kind of high durability, flame-retardant building template material and its preparation method and building template, belong to polycarbonate building template material technical field.The material is by weight fraction, including: polycarbonate 100 parts, ABS 20-25 parts, dispersing agent 8-10 parts, epoxidized silicone rubber 12-15 parts, amino halogen-containing compound 3-5 parts, 4, 4 '-diamino diphenyl sulfide 1-2 parts, flame retardant 0.5-1 part, compatible aid 5-8 parts, antioxidant 0.5-0.6 parts, light stabilizer 0.5-0.6 parts, anti-dripping agent 0.2-0.3 parts.The addition of epoxidized silicone rubber, amino halogen-containing compound, 4, 4 '-diamino diphenyl sulfide added in the material can improve durability, flame retardancy and performance uniformity simultaneously, prolong the service life and use safety of material.

As described herein, the dark count rate (DCR) of perovskite photon-counting detectors (PCDs) was dominated by charge de-trapping from shallow traps located at the grain boundaries and surface, and the ultra-low DCR was achieved by suppressing the shallow traps by enhancing grain size and passivating film surface with diphenyl sulfide. The suppression of shallow traps made the perovskite PCDs have 100-1000 times lower DCR and much better response linearity to weak light than SiPMs. and the DCR was not sensitive to temperature due to small activation energy of charge traps. The zero-bias operating perovskite PCDs were demonstrated as γ-ray spectrum detectors with better energy resolution under 57Co source than commercial SiPMs at room temperature. At higher temperature up to 85° C. the perovskite PCDs are much superior to SiPMs by maintaining the energy resolution, showing their potential of working in harsh environment. This study discovered regular surface passivation also dramatically impact shallow charge traps, which should have implication of perovskite stability and doping.

Electrolyte systems for lithium-based batteries address challenges including polysulfide shuttling, lithium dendrite formation, and strict electrolyte composition requirements through improved solvents, electron withdrawing compounds, lithium ion-transporting compounds, and performance enhancing additives. The electrolyte systems further incorporate phenyl-based chalcogenide compounds, including Diphenyl sulfide, Diphenyl diselenide, and Diphenyl ditelluride, as redox mediators having redox potentials proximate to the Li-S redox potential. The redox mediators undergo reduction at the cathode surface and diffuse through the electrolyte to mediate electron transfer to lithium polysulfides not in direct contact with conductive surfaces, facilitating conversion to Li2S and improving active material utilization. Diphenyl ditelluride demonstrates superior capacity enhancement across discharge rates from 0.1 C to 1 C. These developments provide synergistic benefits including improved charge / discharge capacity, Coulombic efficiency, cycle life, and sulfur utilization while reducing polysulfide shuttling and lithium dendrite formation.

The invention relates to the technical field of compound preparation, in particular to a preparation process of 2, 2, 2-trifluoroethyl diphenyl sulfonium trifluoromethanesulfonate. Comprising the following steps: reacting 2, 2, 2-trifluoroethanol, formic acid and acetic anhydride, rectifying the reaction liquid, and collecting a target fraction to obtain 2, 2, 2-trifluoroethyl formate; according to the method, 2, 2, 2-trifluoroethyl formate, diphenyl sulfide and trifluoromethanesulfonic acid are subjected to a reaction, reaction liquid is cooled, solids are separated out, organic solvent washing is carried out, 2, 2, 2-trifluoroethyl diphenyl sulfonium trifluoromethanesulfonate is obtained, the purity can reach 99.7%, and the total reaction yield can reach 78.93%. The preparation process provided by the invention has the advantages of cheap and easily available raw materials, simple operation, high reaction yield, mild reaction conditions, high safety and simple reaction post-treatment, and is suitable for industrial large-scale production.

The invention discloses an all-solid-state polymer electrolyte membrane for a lithium battery as well as a preparation method and application of the all-solid-state polymer electrolyte membrane, and belongs to the technical field of polymer electrolyte. The preparation method of the all-solid-state polymer electrolyte membrane provided by the invention comprises the following steps: reacting sulfur powder with pentafluorodiphenyl sulfide to obtain a polymer solid; dissolving the polymer solid in N, N-dimethylformamide to obtain a mixed solution, adding lithium bis (trifluoromethanesulfonyl) imide into the mixed solution, and uniformly mixing to obtain a precursor solution; and casting the precursor solution into a mold, and carrying out vacuum drying to obtain the all-solid-state polymer electrolyte membrane. The all-solid-state polymer electrolyte membrane provided by the invention perfectly solves the problems of low ionic conductivity, poor interfacial compatibility, narrow electrochemical window and low cycle retention rate of solid electrolyte through a three-in-one mechanism. And meanwhile, the lithium metal battery assembled by the all-solid-state polymer electrolyte membrane has excellent electrochemical performance and cycle performance.

The application discloses a kind of full solid-state polymer electrolyte membrane for lithium battery and its preparation method and application, belong to polymer electrolyte technical field.The preparation method of full solid-state polymer electrolyte membrane provided by the application includes the reaction of sulfur powder and pentafluorodiphenyl sulfide to obtain polymer solid;Polymer solid is dissolved in N, N-dimethylformamide to obtain a mixed solution, lithium bis-trifluoromethanesulfonimide is added to the mixed solution and mixed uniformly to obtain a precursor solution;The precursor solution is cast in a mold, and the full solid-state polymer electrolyte membrane is obtained after vacuum drying.The full solid-state polymer electrolyte membrane provided by the application perfectly solves the problems of low ionic conductivity of solid-state electrolyte, poor interface compatibility, narrow electrochemical window and low cycle retention rate through a three-in-one mechanism.Meanwhile, the lithium metal battery assembled with the full solid-state polymer electrolyte membrane has excellent electrochemical performance and cycle performance.

The present invention relates to the field of environmental protection, and specifically relates to a toughened vinyl ester resin formulation, its preparation method and application. The present invention uses epoxy resin, inhibitor, catalyst, acrylic acid, and diluent as raw materials to synthesize vinyl ester resin. The present invention uses diphenylmethane diisocyanate, polypropylene glycol, 2-hydroxyethyl methacrylate, and catalyst as raw materials to synthesize polyurethane acrylate. The vinyl ester resin, polyurethane acrylate, and diaminodiphenyl sulfide, 1,1'-diaminodiferrocene undergo an amino-ene Michael addition reaction to obtain a toughened vinyl ester resin. The product has good stability, a simple operation process, and the toughness of the resin is significantly improved.

The invention belongs to the technical field of high polymer materials, and discloses a modified phenolic resin composition, a preparation method thereof, a cured film and application. The modified phenolic resin composition provided by the invention takes modified phenolic resin with a specific structure as film-forming resin, and the structure of the modified phenolic resin composition comprises a structural unit I consisting of a diphenyl sulfide structure and a fluorene structure and a structural unit II consisting of the diphenyl sulfide structure and a phenol structure; a diphenyl sulfide structure and a fluorene structure are introduced into a modified phenolic resin structure in a special arrangement mode, an organic whole is formed through synergistic cooperation between the diphenyl sulfide structure and the fluorene structure, and the modified phenolic resin composition obtained by compounding the diphenyl sulfide structure with a photosensitizer and a cross-linking agent has excellent heat resistance and mechanical strength after film forming. The method can well meet the requirements of preparation of circuit devices with higher resolution, and has a good application prospect in preparation of semiconductor elements.

The invention provides a diphenyl sulfide compound with a symmetrical structure as well as a preparation method and application thereof, and belongs to the technical field of resource recovery. The invention provides a diphenyl sulfide compound (ES and EO) with a symmetrical (pincerlike) structure and a paired complexing strategy taking the diphenyl sulfide compound as an extracting agent for example, and the diphenyl sulfide compound is used for effectively and selectively recovering Au (III) and Pd (II) from secondary resources. The main active sites of the pincer-like extractant are located on the two sides of the structure of the diphenyl sulfide compound and can form a pairing structure with Au (III) and Pd (II) in PMs, the middle S atom only has an extraction effect on Pd, and Au (III) and Pd (II) can be effectively and selectively recycled from secondary resources.

The invention belongs to the field of functional macromolecules, and particularly relates to a detachable and repairable epoxy vitrimer based on a dynamic carbon-sulfur bond and a preparation method of the detachable and repairable epoxy vitrimer based on the dynamic carbon-sulfur bond, and the detachable and repairable epoxy vitrimer is prepared by taking diphenylmethane bismaleimide, trimethylolpropane triglycidyl ether, dimercaptodiphenyl sulfide or octyldithiol and triethylamine as raw materials, and carrying out curing reaction at 50-150 DEG C for more than 4 hours. After complete curing, the epoxy vitrimer has good solvent resistance, can be completely disassembled in a specific sulfydryl solvent at the same time, and in addition, can realize hot-pressing recovery and remolding at a high temperature.

The invention relates to an electrostatic spraying process for a flame-retardant electrical cabinet metal plate, and belongs to the technical field of electrical cabinet surface treatment. The electrical cabinet sheet metal part is sequentially subjected to degreasing, acid pickling, phosphating, water washing and drying treatment; the preparation method comprises the following steps: putting epoxy resin, a modified aliphatic amine curing agent, 4-ferrocenyl butyl methacrylate, 4, 4 '-dimercaptodiphenyl sulfide, benzoyl peroxide, a composite flame retardant, a pigment filler, a carboxyl-terminated nitrile rubber flexibilizer, an acrylate leveling agent, an antioxidant and a diluent into a mixing machine, and mixing to obtain plastic spraying powder; the pretreated sheet metal part is placed in a spraying room, electrostatic spraying, curing forming and aftertreatment are conducted on the surface of the sheet metal part, and the flame-retardant electrical cabinet sheet metal part is obtained; the prepared plastic spraying coating is high in oxygen index, the vertical combustion grade reaches the V-0 grade, the flame retardant effect is excellent, and combustion accidents caused by high temperature and electric sparks of an electrical cabinet can be effectively prevented.

The application relates to the technical field of synthesis of photoresist initiators, and provides a synthesis method of diphenyl[4-(phenylthio)phenyl] perfluorobutyl sulfonium sulfonate, which comprises the following steps: using diphenyl sulfide, diphenyl sulfoxide and potassium perfluorobutyl sulfonate as raw materials, and performing reaction under the catalysis of anhydride and a strong inorganic acid; after the reaction is completed, the product is extracted by using an organic solvent; then aromatic solvent recrystallization is performed to obtain the diphenyl[4-(phenylthio)phenyl] perfluorobutyl sulfonium sulfonate, and the purity can reach more than 99%.

The embodiment of the invention provides a sulfur-containing polymer electrolyte and a preparation method thereof, and relates to the technical field of supercapacitors. The method comprises the following steps: mixing 4, 4 '-dimercaptodiphenyl sulfide with an N, N-dimethylformamide solution which comprises an electrolyte salt and N, N-dimethylformamide, and stirring at a constant temperature under the protection of an inert atmosphere to generate a monomer mixture; paraphthaloyl chloride is added into the monomer mixture for condensation polymerization, and a pre-polymerization solution is obtained; heating the pre-polymerized liquid to carry out post-polymerization reaction, cooling the pre-polymerized liquid to room temperature, adding trimethylolpropane triacrylate and a photoinitiator, and uniformly dispersing to obtain a mixed system; the mixed system is subjected to a cross-linking reaction under ultraviolet irradiation, and a three-dimensional cross-linked sulfur-containing polymer electrolyte membrane is formed; and drying the sulfur-containing polymer electrolyte membrane, and removing the residual solvent to obtain the target sulfur-containing polymer electrolyte.

The invention discloses a fireproof heat-insulating coating for a battery pack and a preparation method of the fireproof heat-insulating coating, and relates to the technical field of fireproof coatings. The fireproof heat-insulating coating for the battery pack prepared by the invention comprises a composite flame-retardant charring agent, modified phenolic resin, a filler, a silane coupling agent and a defoaming agent, the modified phenolic resin is prepared by reacting dihydroxyl-terminated polyphenyl ether, amino phenolic resin and polythioacetal, the dihydroxyl-terminated polyphenyl ether is prepared by reacting 2, 6-dimethylphenol and tetramethyl bisphenol A, and the polythioacetal is prepared by polymerizing 1, 3-dimercapto-2-propanol and cinnamyl aldehyde, so that the thermal stability is improved, and the self-repairing capability of the coating is improved; the composite flame-retardant charring agent is prepared by reacting a sulfonyl piperazine compound, 4, 4 '-dimercaptodiphenyl sulfide and diaminodiphenylmethane modified ammonium polyphosphate, and the sulfonyl piperazine compound is prepared by reacting chlorosulfonyl isocyanate with piperazine and then reacting with chloroacetyl chloride, so that the charring property and thermal stability of the coating are improved.

The invention provides 4-methoxy naphthol-1-yl diphenyl sulfonium trifluoromethanesulfonate as well as a preparation method and application thereof, and belongs to the technical field of organic chemical synthesis. The method comprises the following steps: uniformly mixing 1-methoxyl naphthol, diphenyl sulfide and an organic solvent under protective gas, dropwise adding trifluoromethanesulfonic anhydride at controlled temperature, carrying out heat preservation reaction, and after the reaction is finished, carrying out post-treatment to obtain the 4-methoxyl naphthol-1-yl diphenyl sulfonium trifluoromethanesulfonate. The preparation method disclosed by the invention is simple, the reaction system is green and environment-friendly, the selectivity is good, the total preparation cost is low, and the yield is high.

The invention relates to the technical field of preparation of photoacid generators, in particular to a preparation method and application of (4-fluorophenyl) diphenyl sulfonium trifluoromethanesulfonic acid. The preparation method comprises the following steps: mixing p-iodofluorobenzene, fluorobenzene and m-chloroperoxybenzoic acid to obtain a mixed raw material; carrying out substitution reaction on trifluoromethanesulfonic acid and the mixed raw material to obtain an intermediate product; wherein the intermediate product has a structural formula shown as a formula 1, and in the formula 1, TfO is a trifluoromethanesulfonic acid anion; under the condition that copper acetylacetonate is used as a catalyst, diphenyl sulfide and the intermediate product are subjected to a catalytic reaction, and the (4-fluorophenyl) diphenyl sulfonium trifluoromethanesulfonic acid is obtained. The preparation method can effectively and synchronously improve the yield of the (4-fluorophenyl) diphenylsulfonium trifluoromethanesulfonic acid to 70% or above and the purity of the (4-fluorophenyl) diphenylsulfonium trifluoromethanesulfonic acid to 99.0% or above based on coordination of reaction step-by-step refinement, electronic effect, structural stability and catalytic action.

The invention discloses an exosome based on a stem cell source for tissue repair, and belongs to the technical field of biological materials. Aiming at the limitation of the traditional skin tissue repair means and the problems of poor stability, low delivery efficiency and the like of stem cell-derived exosomes in application, the human umbilical cord mesenchymal stem cells are extracted through a tissue block adherence method and are cultured and subcultured, and the exosomes are extracted through multi-step centrifugation; the preparation method comprises the following steps: preparing methyl diphenyl sulfide functionalized polycysteine modified polyethylene glycol-fucoidin gel by adopting a multi-step chemical reaction, and compounding the methyl diphenyl sulfide functionalized polycysteine modified polyethylene glycol-fucoidin gel with exosome to form a gel-loaded mesenchymal stem cell exosome composite material; the composite material is applied to skin wound repair. The gel carrier protects the exosome through interaction of physical embedding and chemical, regulates and controls the release rate of the exosome, and reduces the administration frequency; the fucoidin, polyethylene glycol and other components in the gel carrier have a synergistic effect, so that the compatibility of the material and tissues is enhanced, the inflammatory reaction is relieved, and the exosome structure is protected.