130 results about "Mercapto Compounds" patented technology

The invention discloses a photoelectric device, a preparation method thereof and a display device, and relates to the technical field of display. The photoelectric device comprises an anode, a functional layer and a cathode which are stacked. The material of the functional layer comprises a doped corrosion inhibitor, and / or a first corrosion inhibition layer is arranged between the anode and the functional layer, and the material of the first corrosion inhibition layer comprises a first interface corrosion inhibitor; the doping corrosion inhibitor and the first interface corrosion inhibitor respectively comprise one or more of a thiazole compound and a cyclic sulfydryl compound. The photoelectric device provided by the invention is good in corrosion resistance.

The present invention discloses a class of imide ring-containing dimercapto monomers, imide ring-containing diene monomers and preparation methods thereof, a light-responsive polyimide material and preparation method thereof, and relates to the technical field of light-driven materials. The present invention uses a dibasic acid anhydride as the basic monomer unit, and prepares a dimercapto monomer containing an imide structure and a monomer containing an imide ring-containing diene monomer by reacting with a monothiol compound and a monoalkyne compound, respectively. The two monomers are subjected to a thiol-alkyne click reaction to finally obtain a high molecular weight polyimide. The polyimide obtained by the present invention has excellent solubility, high tensile strength, good heat resistance and light transmittance; the polyimide material is placed under an ultraviolet lamp for uneven photocrosslinking to quickly obtain a light driver with excellent reversible driving performance.

The invention discloses a gamma-polyglutamic acid and hydrophilic polysiloxane composite material and application thereof, and belongs to the technical field of medical antibacterial coating materials. The gamma-polyglutamic acid and hydrophilic polysiloxane composite material is prepared from a hydrophilic polysiloxane aqueous solution and a gamma-polyglutamic acid aqueous solution through an ionic cross-linking reaction, the hydrophilic polysiloxane is prepared by sequentially carrying out click chemical reaction and ionization modification on polysiloxane with a side chain containing vinyl and a sulfydryl-containing compound; the sulfydryl-containing compound also contains a carboxylic acid group or an amino-terminated group; when the sulfydryl-containing compound further contains carboxylic acid groups, the raw materials of the ionic cross-linking reaction further comprise an aqueous solution containing divalent metal cations. The composite material has low swelling rate and good antibacterial performance, and can be used for long-acting stable antibacterial. As an antibacterial coating, the composite material is suitable for the surfaces of medical apparatuses and instruments made of different materials, and has a wide application prospect.

The application provides a preparation method of ergothioneine and application of a mercapto compound in the method. The method comprises the following steps: in the presence of a catalyst system, a sulfur oxide is reacted to generate ergothioneine. The catalyst system comprises a first catalyst and a second catalyst. The first catalyst is ergothioneine synthase, and the second catalyst is one or more of a mercapto-containing amino acid and a mercapto-containing polypeptide. The preparation method of ergothioneine provided by the application does not need to use a large amount of a chemical mercaptan reagent with a foul smell, has the advantages of high efficiency, green environmental protection, and friendly production scene, and is beneficial to industrial production of ergothioneine.

The invention discloses a sulfur-containing organic silicon gel material and a preparation method and application thereof, and the preparation method comprises the following steps: in the presence of a solvent, a sulfhydryl compound and an epoxy group of an epoxy group-containing silane coupling agent are subjected to a ring-opening reaction, and meanwhile, an alkoxy group of the epoxy group-containing silane coupling agent is subjected to a hydrolytic condensation reaction to obtain the sulfur-containing organic silicon gel material. And freeze-drying to obtain the sulfur-containing organic silicon gel material. The organic silicon material is prepared through hydrolytic condensation of the silane coupling agent, meanwhile, the sulfhydryl-containing compound and an epoxy group of the epoxy group-containing silane coupling agent are subjected to a ring-opening reaction, a large number of sulfur-containing groups are introduced into the organic silicon material in a covalent bond mode, lone pair electrons of sulfur serve as adsorption sites of iodine, and the adsorption capacity of the material to iodine is improved; the silicon substrate ensures that the material has high irradiation resistance and acid resistance, so that efficient adsorption and enrichment of volatile iodine isotopes are realized; the sulfur-containing organosilicon gel material is rapidly prepared through a one-step method, the preparation method is simple, and the cost is low.

The present invention provides a water-based dispersion comprising (a) nitrogen compound selected from 3a,4,7,7a-Tetrahydro-1H-isoindole-1,3(2H)-dione and 1,3- Dihydro-2H-isoindole-1,3-dione and (b) sulfonate-based dispersant, and further provides a process for producing phthalimide based fungicide which comprises (1) preparing a water-based dispersion comprising (a) nitrogen compound such as 3 a, 4, 7,7a- Tetrahydro- 1H-isoindole-1,3 (2H)-dione and 1, 3 -Dihydro-2H-i soindole-1,3- dione and (b) sulfonate-based dispersant, (2) reacting the dispersion of step (1) with aqueous alkaline solution, (3) reacting the resulting salt with mercapto-based compound selected from perchloromethyl mercaptan (PCMM) and pentachloro ethyl mercaptan (PCEM) to obtain phthalimide based fungicide such as folpet, captan and / or captafol.

The invention discloses a method for low-alkalinity flotation of lead-zinc (silver-containing) polymetallic ore based on a heterocyclic sulfydryl coordination polymer, which comprises the following steps of: adjusting the pH value of ore pulp to 7.5 + / -0.3, and sequentially carrying out roughing, scavenging and concentration by adopting a composite collecting agent according to a gradient flotation procedure; wherein the mass concentration of the ore pulp is 20-40%; the adding amount of the composite collecting agent is 150-300g / t of ore pulp; the composite collecting agent is composed of a modified heterocyclic sulfhydryl compound, C12-C18 alkylamine polyoxyethylene ether and a star-shaped branched nonionic surfactant according to the mass ratio of 1: (1-3): (0.5-2). According to the method, the complex silver polymetallic ore is subjected to efficient flotation under the low-alkalinity condition by applying the composite collecting agent based on the heterocyclic sulfydryl coordination polymer. Through deep exploration and optimization of a flotation reagent system, process parameters and a microcosmic action mechanism, the recovery rate of metal such as silver, copper and lead is remarkably increased, and the ore dressing cost is greatly reduced.

The invention discloses a thin film, a preparation method thereof and a photoelectric device, and relates to the technical field of photoelectricity. Materials of the thin film comprise a lead-containing quantum dot material and a sulfhydryl-containing compound which are crosslinked with each other, and a crosslinking bond between the lead-containing quantum dot material and the sulfhydryl-containing compound comprises a monosulfur bond. The film provided by the invention can effectively reduce the possibility that lead in the lead-containing quantum dots leaks into a water system in the environment, reduce the solubility of lead in the lead-containing quantum dot material in water, and improve the stability of the film.

The invention discloses a surfactant with a branched structure as well as a preparation method and application of the surfactant. The preparation method comprises the following steps: carrying out Michael addition reaction on an amphiphilic branched polymer and polyfluorinated organic amine in an organic solvent in the presence of a catalyst to obtain the surfactant with the branched structure, the amphiphilic branched polymer has a hydrophilic chain segment and a hydrophobic chain segment, and the tail end of a branched molecular chain has double bonds. The amphiphilic branched polymer is obtained by copolymerization of polyethylene glycol di (methyl) acrylate and polypropylene glycol di (methyl) acrylate through active free radicals, or is prepared by Michael addition polymerization of a di (methyl) acrylate compound and a dimercapto compound or a diamine compound in an organic solvent in the presence of a catalyst. The surfactant can quickly reduce the surface tension and prolong the retention time of pesticide liquid, and is green, environment-friendly and degradable.

An alkoxysilyl-containing polyurethane polymer composition is prepared using a urethane-forming organometallic catalyst which is then stabilized to moisture exposure by the addition of a mercapto-containing compound. The stabilized moisture-curable alkoxsilyl-containing polyurethane polymer composition is activated to moisture curing by the addition of a hydrolysis and condensation catalysts. The stabilized moisture-curable alkoxsilyl-containing polyurethane polymer composition is useful as a component in the preparation of coatings, adhesives, sealants, consumer goods and industrial goods.

The invention discloses a tellurium-based nano material capable of efficiently inducing copper death as well as a preparation method and application of the tellurium-based nano material. The preparation method comprises the following steps: by taking water as a medium, mixing soluble copper salt and a sulfydryl-containing compound, and stirring to react, so as to obtain a Cu-S2 solution; dropwise adding the Cu-S2 solution into the TeO2 nano-carrier solution, and carrying out stirring reaction; and after the reaction is finished, carrying out solid-liquid separation, taking the solid, and resuspending with methanol to obtain the TeO2 coated Cu-S2 nano material. The preparation method is simple and rapid, large-scale production can be achieved, and the obtained TeO2 coated Cu-S2 nano material can efficiently induce cancer cells to generate copper death, is effective to various cancer cells and has potential clinical transformation application prospects.

The invention discloses an electrically-assisted passivation solution and a preparation method and a passivation method thereof.The electrically-assisted passivation solution is prepared from 0.1 wt%-1 wt% of an alkali-soluble sulfhydryl compound, 0.1 wt%-1 wt% of amphoteric oxide, 1 wt%-5 wt% of inorganic alkali, 0.5 wt%-1.5 wt% of a nonionic surfactant and the balance water, the components do not contain toxic substances, and the passivation solution is suitable for an electrically-assisted passivation technology. And the film forming process on the copper piece is very fast, the formed film layer is compact and uniform, and the copper piece is good in corrosion resistance effect, high in protection effect and environmentally friendly.

The application discloses a kind of based on fluorine-free organic small molecule ultra-thin super-hydrophobic coating and preparation method thereof, specific steps are as follows: 20 portions-40 portions of amine compound, 20 portions-40 portions of epoxy compound and 20 portions-40 portions of solvent are mixed, and mixed solution is obtained.After substrate is soaked in mixed solution 1h-24h, pretreated substrate is obtained.1 portion-30 portions of olefin compound, 1 portion-25 portions of polydimethylsiloxane, 1 portion-25 portions of initiator, 1 portion-40 portions of mercapto compound, 1 portion-40 portions of solvent are mixed, and mixed coating is obtained.Mixed coating is evenly covered on the surface of pretreated substrate, and after standing 1h-7h, it is dried, and ultra-thin super-hydrophobic coating is obtained.The ultra-hydrophobic coating prepared by the method has excellent stability, durability, self-cleaning property and oil-water separation performance, and can be widely used for separating immiscible oil-water mixture.

The application provides a preparation method of super-hydrophobic cotton cloth with self-cleaning and oil-water separation functions, and belongs to the technical field of functional materials. The preparation method is characterized by the following steps: modifying a commercial cotton cloth by using a silane surfactant to modify a mercapto group, in-situ grafting polybutadiene on the modified cotton cloth by using a photosensitizer in a n-hexane solution, and grafting hydrophobic particles to the cotton cloth by using a bis-mercapto compound. The super-hydrophobic cotton cloth prepared by the application has good super-hydrophobic performance and oil-water separation selectivity, and has a super-high continuous adsorption efficiency of oil in an oil-water mixture, which can reach 99.9%. The application has a simple process and is suitable for industrial production. The super-hydrophobic cotton cloth prepared by the application has high stability, can be recycled, and can be used for repairing water bodies such as marine oil spills and oil-containing industrial wastewater treatment.

The invention belongs to the technical field of optical materials, and particularly relates to a sulfur-containing oligomer, application thereof and an optical material composition. According to the invention, the dimercapto compound or the dimercapto compound reacts with the monomer containing the unsaturated group at the tail end, the high-refraction oligomer is obtained by adopting the click chemical reaction between the mercapto group and the double bond, the S element is retained on the main chain after the reaction is finished, and the content of the S element in the finally obtained oligomer is very high, so that the refractive index is greatly improved. Moreover, the monomer containing the unsaturated group contains an alkyl chain, so that the flexibility of the oligomer is improved, and the obtained optical resin has good flowability and mechanical property.

The application discloses a method for preparing a disulfide at low temperature, which comprises the following steps: coupling reaction of m-dihalobenzene and a mercapto compound in the presence of sodium hydride and lithium iodide to prepare the disulfide. At present, the existing methods for synthesizing a disulfide have some problems to a greater or lesser extent. Either noble metal catalysis is needed, the cost is high, and there is a risk of heavy metal residue in the product; or the reaction operation is complex and complicated, and the reaction condition is harsh. The application develops a new method, which can start from cheap and readily available raw materials, use cheap initiators, and simply and effectively synthesize a disulfide under mild reaction conditions, so as to meet the needs of research and development and actual production.

The invention discloses a sulfur-containing gem-difluoroallyl compound as well as a preparation method and application thereof. The invention provides a preparation method of a compound as shown in a formula C. The preparation method comprises the following step: in a solvent, in the presence of alkali, carrying out gem-difluoroallylation reaction on a compound as shown in a formula A and a compound as shown in a formula B to obtain the compound as shown in the formula C. According to the method, the sulfydryl in the sulfydryl-containing compound can be mildly and efficiently gem-difluoroallylated, metal catalysis is not needed, the reaction can be performed in a water phase, the operation is simple, and the method is suitable for performing rapid fluoroalkylation modification and further functional modification on polypeptide, protein, complex bioactive molecules and the like; the method has very important application prospects in the fields of medicine, life science and the like.

This application is a divisional application of 202110626296.8. This application belongs to the field of medicine and discloses β-lactamase inhibitors. The present invention discloses for the first time that thiol-containing compounds (3-thio-1-hexanol) or their derivatives have a good inhibitory effect on β-lactamase (metallo-β-lactamase and / or serine β-lactamase), can protect antibiotics from being degraded by bacteria, increase bacterial sensitivity to antibiotics, and reverse bacterial resistance to antibiotics; at the same time, thiol-containing compounds (3-thio-1-hexanol) and / or their derivatives are used in combination with antibiotics to have a good synergistic effect and can be used as a composite drug to inhibit bacteria.

The invention provides naphthyl high-refractive-index optical resin as well as a preparation method and application thereof, the structural formula of the naphthyl high-refractive-index optical resin is as shown in formula (1), and the refractive index of the naphthyl high-refractive-index optical resin is 1.685-1.778; the weight-average molecular weight of the naphthyl high-refractive-index optical resin is 2.24 * 10 < 4 >-8.92 * 10 < 4 > g / mol; the invention relates to a method for preparing naphthyl high-refractive-index optical resin, which comprises the following steps: dissolving a dimercapto compound and binaphthol fluorene diacrylate in a solvent A, adding a catalyst under the protection of nitrogen, uniformly stirring, and carrying out Michael addition polymerization reaction under the conditions of normal pressure, polymerization temperature of 0-120 DEG C and polymerization time of 1-24 hours to obtain a mixed solution; then adding the mixed solution into a solvent B, regenerating, separating out blocks, and washing and purifying to obtain the naphthyl high-refractive-index optical resin. The material has the beneficial effects of high refractive index and high thermal stability, can meet the use requirements of higher refractive index, lighter weight and thinner weight of optical products, and is suitable for the technical field of optical materials.

This invention discloses an electro-assisted passivation solution and its preparation and passivation methods. The raw materials of the electro-assisted passivation solution include the following components: 0.1-1 wt.% alkali-soluble mercapto compound, 0.1-1 wt.% amphoteric oxide, 1-5 wt.% inorganic alkali, 0.5-1.5 wt.% nonionic surfactant, and the balance being water. The components do not contain toxic substances. The passivation solution is suitable for electro-assisted passivation processes. The film formation process on copper parts is very fast, and the formed film layer is dense and uniform, resulting in good corrosion resistance, high protection effect, and environmental friendliness for the copper parts.

The present invention discloses a biosynthetic injectable adhesive and a preparation method thereof and an application thereof in intestinal fistula repair. The biosynthetic injectable adhesive comprises a copolymer of 3-hydroxybutyric acid and medium-chain unsaturated hydroxy fatty acid monomers, a dithiol compound, a photoinitiator, and a solvent. Through ultraviolet light irradiation, it can achieve rapid in-situ cross-linking with tissues to form a firm and tough liquid seal, and combined with the biological effect of the degradation product of the copolymer material of 3-hydroxybutyric acid and medium-chain unsaturated hydroxy fatty acid monomers to promote cell proliferation, it achieves effective blocking and repair of wounds in the dynamic wet environment of the intestine.

The application relates to the technical field of compound synthesis, and discloses an aromatic dipeptide functionalized mercapto compound, 3,5-di(triphenylmethylthio)benzoic acid is obtained by adding 3,5-di(methylmercapto)benzoic acid and pyridine into a solution of chloromethyl triphenylphosphonium, purifying after sufficient reaction; then the 3,5-di(triphenylmethylthio)benzoic acid is mixed with N-hydroxysuccinimide and dissolved in an organic solvent, EDC.HCl is added, purifying after sufficient reaction; then 2,5-dioxopyrrolidin-1-yl 3,5-bis(triphenylmethylthiomethyl)benzoate is obtained; then phenylalanine-tryptophan and triethylamine are added, purifying after sufficient reaction; then (3,5-bis(triphenylmethylthiomethyl)benzoyl)tryptophylphenylalanine is obtained; then trifluoroacetic acid and triethylsilane are added, purifying after sufficient reaction; and finally the aromatic dipeptide functionalized mercapto compound is obtained. The aromatic dipeptide functionalized mercapto compound can quickly and effectively identify sodium and potassium ions, and has relatively low detection limit and relatively loose detection condition.

The invention relates to the technical field of papermaking, in particular to a preparation method of ultrathin high-strength paper-based adhesive tape base paper. The preparation method comprises the following steps: mixing softwood pulp and hardwood pulp, forming base paper by adopting a double-net dehydration process, and forming a covalent cross-linked network in a paper sheet by adopting a cellulose reactive coupling agent with an o-benzoquinone structure and a multi-sulfydryl compound based on a sulfydryl-benzoquinone click chemistry and interface supramolecular assembly multi-bonding enhancement system; meanwhile, a dual intelligent enhancement system based on a biomacromolecule self-assembly body and a dynamic metal coordination network is established, and dynamic reversible crosslinking is constructed through a polyelectrolyte compound and a Fe < 3 + >-tannic acid coordination network; a multifunctional surface treatment technology combining a zwitterionic polymer brush and bionic in-situ mineralization is developed, a sulphobetaine methacrylate polymer brush grows through a surface-initiated atom transfer radical polymerization method, amorphous silicon dioxide is induced to be mineralized, and the adhesive tape body paper prepared through the method is high in strength.

The application provides a photosensitive resin composition, a resist ink, a resist laminated body and application thereof. The photosensitive resin composition comprises, in parts by weight, 50-70 parts of an alkali-soluble resin, 30-50 parts of a photopolymerizable monomer and 0.1-4.0 parts of a photoinitiator; wherein the photopolymerizable monomer comprises an allyl compound and a mercapto compound, and the mass content of the mercapto compound in the photopolymerizable monomer is 7wt%-22wt%. The application introduces the allyl compound and the mercapto compound into the photosensitive resin composition, the alkyl group in the allyl compound can add polymerize with the mercapto group in the mercapto compound, which helps to make the prepared photosensitive resin have relatively uniform crosslinking after exposure, and obtain a photosensitive resin with low polymerization shrinkage stress, which shows good adhesion in the bonding process of a copper substrate.

The invention discloses an application of a phenolic anti-aging agent with thermal oxidation resistance and ozone aging resistance in a diene rubber composite material. The phenolic anti-aging agent is obtained by reacting a natural antioxidant containing a phenolic hydroxyl group and unsaturated double bonds with a sulfhydryl compound. According to the invention, the natural antioxidant is modified by adopting click chemical reaction, and the obtained product has excellent performance in the aspects of thermo-oxidative aging resistance and ozone aging resistance, so that the thermo-oxidative aging process of the rubber composite material can be obviously slowed down, and cracks generated on the surface of the material due to uniform cracking of ozone can be effectively reduced.

The invention discloses an injectable self-healing hydrogel based on thiohemiketal as well as a preparation method and application thereof, and the injectable self-healing hydrogel is prepared according to the following steps: (1) preparation of a water-soluble trifluoroacetophenone monomer: adding 1-(4-(bromomethyl) phenyl)-2, 2, 4-triazole-1-yl)-1, 2, 4-triazole-1-yl)-2, 2, 4-triazole-1-yl)-2, 2, 4- The preparation method comprises the following steps: carrying out quaternization reaction on 2, 2-trifluoroethyl-1-ketone and a quaternization reagent containing double bonds to obtain a water-soluble trifluoroacetophenone monomer; (2) carrying out free radical copolymerization on a water-soluble trifluoroacetophenone monomer and a hydrophilic monomer to obtain a trifluoroacetophenone functionalized linear polymer; and (3) mixing the trifluoroacetophenone functionalized linear polymer with the aqueous solution of the multi-sulfhydryl compound to obtain the injectable self-healing hydrogel based on the thiohemiketal. According to the method, a linear polymer functionalized by trifluoroacetophenone reacts with a multi-sulfhydryl compound to form the thiohemiketal dynamic cross-linked injectable self-healing hydrogel, so that the problems that part of dynamic covalent hydrogel is insufficient in self-healing performance and limited in pH use range are solved.

The invention discloses an efficient collecting agent applied to iron ore reverse flotation desulfurization and a preparation method and application of the efficient collecting agent, and particularly relates to the technical field of beneficiation reagents. The efficient collecting agent is a dimercapto compound, sulfur atoms in molecules of the dimercapto compound show high electron donating capacity, and when the sulfur atoms react with metal ions, the sulfur atoms in the molecules of the dimercapto compound show high electron donating capacity; sulfur atoms form coordinate bonds with metal ions by means of lone pair electrons, and the dissociation tendency of the metal ions is remarkably reduced in the process, so that the overall stability of the formed complex is improved. The disulfhydryl compound can generate insoluble black complex precipitates with Fe < 2 + > ions in ore pulp, but cannot generate precipitates with Fe < 3 + > ions, so that the disulfhydryl agent has very strong collecting capacity on pyrite and cannot react with hematite, ether bonds are introduced into the disulfhydryl compound, the solubility, surface tension and molecular activity of the disulfhydryl compound can be increased, and the disulfhydryl compound can be used for collecting the hematite. The collecting capacity is enhanced, and effective separation of pyrite and hematite can be achieved by using dimercapto ether as the collecting agent.

The embodiment of the invention relates to the field of catalytic synthesis of sulfhydryl compounds, in particular to a method for preparing 3-mercaptopropionic acid by efficiently catalyzing an acrylic acid-hydrogen sulfide addition reaction through organic phosphorus. Uniformly mixing acrylic acid, a polymerization inhibitor and part of a solvent, and transferring the mixture into a constant-pressure titrator; uniformly mixing an organic phosphine catalyst with the residual solvent, and transferring the mixture into a high-pressure kettle; the method comprises the following steps: connecting a constant-pressure titrator with a high-pressure kettle, firstly introducing inert gas to purge a reactor, then sequentially introducing reducing gas and hydrogen sulfide gas, and maintaining the pressure for a certain period of time; starting a constant-pressure titrator and dropwise adding a raw material mixed solution containing acrylic acid at a certain rate; and after the raw material mixed solution is dropwise added, introducing hydrogen sulfide gas again, and carrying out an acrylic acid-hydrogen sulfide addition reaction. The reaction conditions for preparing the 3-mercaptopropionic acid provided by the invention are mild, the generation amount of three wastes is small, the high reaction yield of the 3-mercaptopropionic acid can be realized under the conditions of low reaction temperature and pressure, and the 3-mercaptopropionic acid product with the purity of more than 99.8% can be obtained from the reaction liquid through a vacuum distillation process.

The invention discloses a sulfhydryl compound activated chemiluminescence probe as well as a synthesis method and application thereof, and belongs to the technical field of biological probes. The preparation method comprises the following steps: uniformly mixing prop-2-ene-1-yl N-[4-(hydroxymethyl) phenyl] carbamate with an acetonitrile mixture of NaI, then adding trimethylchlorosilane, stirring at room temperature in a dark place, diluting, washing and drying to obtain prop-2-ene-1-yl N-[4-(iodomethyl) phenyl] carbamate; and then adding 3-[2-hydroxy-4-(4-methoxy spiro [1, 2-dioxocyclobutane-3, 2 '-tricyclo [3.3. 1.13, 7] decyl]) phenyl]-2-acrylonitrile, mixing, reacting in a dark place, and purifying to obtain the sulfydryl compound activated chemiluminescent probe. The probe can detect a target spot in real time in a complex biological environment under the catalysis of a Ru catalyst, is used for detecting the activity of sulfhydryl-containing compounds, albumin, clinical blood copper ions and sulfhydryl-containing compounds in living cells, and is beneficial to the development of the BCR probe in the fields of biological application and optical imaging.

The invention relates to a method for extracting cashmere and wool keratin by using a disulfydryl reducing agent. The method comprises the following steps: (1) pretreating cashmere and wool fibers; preparing a disulfydryl reducing agent solution, then adding urea and lauryl sodium sulfate, and adjusting the pH value to obtain an extraction solution; adding pretreated cashmere and wool fibers, introducing nitrogen for protection, heating and stirring to obtain a cashmere and wool keratin extracting solution; and (2) centrifuging the cashmere and wool keratin extracting solution to obtain a supernatant, dialyzing the supernatant, taking out a protein solution in a dialysis bag after dialysis, adjusting the pH value of the solution to an isoelectric point, separating out keratin in the solution, centrifuging to obtain a precipitate, and freeze-drying the precipitate to obtain the cashmere and wool keratin. The keratin powder prepared by the preparation method disclosed by the invention is large in density, high in strength and uniform in pores, meanwhile, the relative molecular weight is relatively high and is 15-25KDa, the price of the extract is low, and the keratin powder has a good market application prospect.