126 results about "Dimethylammonium chloride" patented technology

The invention relates to the technical field of hydrometallurgy, and provides a preparation method for extracting metal hafnium from hafnium-containing waste, which comprises the following steps: S1, dissolving the hafnium-containing waste to obtain a dissolved solution; s2, an organic phase is added into the dissolving solution for extraction, a hafnium-containing organic phase is taken for back extraction and precipitation, and hafnium oxide is obtained; the organic phase comprises an extraction agent; the extracting agent comprises dioctadecyl dimethyl ammonium chloride and trioctyl methyl ammonium chloride in a mass ratio of (1: 9)-(9: 1). According to the technical scheme, the problems of low yield and purity of metal hafnium extracted from hafnium-containing waste materials in related technologies are solved.

The invention discloses a preparation method of a composite flocculant based on efficient water treatment, belongs to the technical field of flocculant processing, and aims to solve the technical problem that the flocculation performance and the settling performance of a flocculant need to be further improved in the prior art. The preparation method specifically comprises the following steps: putting acrylamide, diallyldimethylammonium chloride, 2-hydroxypropyl methacrylate and deionized water into a reaction kettle, and uniformly mixing to obtain a mixed monomer; according to the preparation method, citric acid monohydrate and iron nitrate nonahydrate react under a mild acidic condition to form a Fe < 3 + >-citric acid complex, and then 2-hydroxyethylamine is introduced to further participate in complexing to obtain a citric acid complexing solution, so that not only is the flocculation performance of the composite flocculant improved, but also the settling performance of the composite flocculant is improved.

The invention relates to organic modified magnetic bentonite as well as a preparation method and application thereof, and the organic modified magnetic bentonite is a ternary composite material which takes bentonite as a carrier to load gamma-Fe2O3 magnetic particles and is subjected to surface modification by using an organic modifier 3-(trimethoxysilyl) propyl-N-octadecyl dimethyl ammonium chloride (TPODAC). Compared with the prior art, the organic modified magnetic bentonite disclosed by the invention not only can improve the adsorption performance of pretilachlor, but also can realize rapid magnetic separation of an adsorbent under the condition of an external magnetic field, so that the adsorbent can be recycled for multiple times. The adsorbent organic modified magnetic bentonite has the advantages of efficient adsorption and rapid recovery, the preparation method is simple and easy to implement, and the adsorbent organic modified magnetic bentonite shows great application potential in treatment of pretilachlor wastewater.

The invention relates to the field of adhesives, and discloses a modified starch-based adhesive and a preparation method thereof, the modified starch-based adhesive comprises modified starch, adipic dihydrazide and borax; the modified starch is prepared by graft copolymerization of modified nano zinc oxide, diacetone acrylamide, diallyldimethylammonium chloride and starch; the modified nano-zinc oxide is prepared by grafting a modified silane coupling agent on the surface of nano-zinc oxide, and the modified silane coupling agent is prepared by performing dehydration condensation on an intermediate prepared by reacting itaconic anhydride and phenyltris (dimethyl siloxane) silane and allylamine to prepare a double-bond grafted intermediate; then, 2-mercaptobenzothiazole, 3-mercaptopropyltriethoxysilane and the double-bond grafted intermediate are subjected to a thiol-ene click reaction, and the adhesive is prepared. According to the invention, the modified starch, the adipic dihydrazide and the borax are added, so that the adhesive is endowed with good adhesive performance, water resistance, heat resistance, antibacterial performance and flame retardant performance.

The invention belongs to the technical field of daily chemical products, and particularly relates to a granular composition with easy-to-flush, soothing and oil-controlling effects and application. The granular composition is prepared from the following components in parts by weight: 21 to 73 parts of a composite surfactant, 2.1 to 21 parts of a humectant, 1 to 4.9 parts of a soothing component, 10 to 20 parts of a filling agent, 1 to 5 parts of an anti-caking agent and 0.1 to 1 part of a thickening agent, the composite surfactant is a compound of distearyl dimethyl ammonium chloride, C14-16 sodium olefin sulfonate, sodium cocoyl isethionate and sodium lauroyl glutamate. According to the invention, a specific composite surfactant is matched with other components to develop the solid washing and caring particle, the solid washing and caring particle can play multiple soothing and cleaning effects, can effectively reduce the use requirements of preservatives, ensures the long-term stability and use effect of the product, is easy to rinse, free of residues, easy to transport or carry, and has a good application prospect. The liquid shampoo can be widely applied to personal care products for washing hair, face or bathing and the like.

The invention belongs to the field of nano material preparation, and discloses a nickel-molybdenum-iron compound growing on foamed nickel and a preparation method and application of an anion exchange membrane. The difunctional electrocatalyst Ni2P / MoOx / Fe2P with an amorphous MoOx and crystal Ni2P / Fe2P heterogeneous structure is prepared through a hydrothermal-etching-phosphating method. Ni2P / MoOx / Fe2P is used as a cathode and an anode, an overall water decomposition (OWS) performance test is carried out in an electrolyte containing 1M of KOH, and the required voltage is only 1.815 V when the current density reaches the large current density of 250mA cm < 2 >. This is attributed to sufficient active sites, abundant phase interfaces and a unique nanorod array structure in the nickel-molybdenum-iron compound. The material still has excellent stability under the ultrahigh constant current density of 500 mA cm < 2 >. The PVA / PDDA-OH <-> membrane with anion selectivity is prepared through physical crosslinking of PVA and PDDA, and the PVA / PDDA-OH <-> membrane has good OH <-> conductivity. The anion exchange membrane water electrolyzer assembled by using the Ni2P / MoOx / Fe2P catalyst and PVA / PDDA-OH <-> stably operates for 250 hours under the current density of 1 A cm <-2 >, the hydrogen production Faraday efficiency is about 94.8% through calculation, and the potential of the anion exchange membrane water electrolyzer in the actual application of large-current hydrogen production is highlighted.

The invention relates to the technical field of oil-gas field development, in particular to a salt-tolerant associated emulsion type fracturing fluid thickener as well as a preparation method and application thereof, and the salt-tolerant associated emulsion type fracturing fluid thickener is prepared by polymerizing a water-phase mixed solution and an oil-phase mixed solution; wherein the water-phase mixed solution is prepared by mixing the following components in parts by weight: 10 to 15 parts of acrylamide, 8 to 12 parts of 2-acrylamido-2-methylpropanesulfonic acid, 6 to 10 parts of methacryloyloxyethyl (4-sulfo) benzyl dimethyl ammonium chloride, 4 to 8 parts of 2-acrylic acid-2-(2-hexadecyl piperazine) ethyl ester and 50 parts of water; the oil-phase mixed solution is prepared by mixing 4-6 parts by weight of an emulsifier and 30-50 parts by weight of white oil; the preparation method comprises the following steps: uniformly mixing an oil-phase mixed solution and a water-phase mixed solution, and reacting at 45-70 DEG C for 2-4 hours under the initiation of azodiisobutyronitrile, the salt-tolerant association emulsion type fracturing fluid thickener can realize hydrophobic association tackifying in water, has the functions of salt tolerance, resistance reduction, sand carrying and the like, is low in residue, small in damage and good in temperature resistance and shear resistance, and meets the construction requirements.

The invention relates to a composition with effects of controlling oil and removing dandruff and application of the composition. The composition with the effects of controlling oil and removing dandruff comprises sophorolipid, myristicamidopropyl PG-dimethyl ammonium chloride phosphate, creatine, a phellinus linteus extract, a hop extract and sodium chloride. According to the composition, the sophorolipid, the myristicamidopropyl PG-dimethyl ammonium chloride phosphate, the creatine, the phellinus linteus extract, the humulus lupulus extract and the sodium chloride are matched for use, the synergistic interaction effect is achieved, the hair cleaning effect can be achieved, meanwhile, healthy water-oil balance is provided for scalp, and the hair care effect is achieved. The completeness of the scalp barrier is favorably kept, so that the sebum secretion of the scalp is better reduced, and the formation of dandruff is reduced.

The invention belongs to the technical field of pesticide carrier preparation, and particularly relates to a preparation method and application of a multifunctional pesticide carrier. The carrier is formed by carrying out cationization and hydrophobic modification on gamma-polyglutamic acid (gamma-PGA) through didecyl dimethyl ammonium chloride (DDAC) and methylene diphenyl diisocyanate (MDI) and carrying out electrostatic self-assembly on the modified gamma-PGA and sodium lignin sulfonate (SL). The carrier can be simultaneously applied to the fields of insecticides and bactericides.

The invention belongs to the technical field of daily chemical products, and particularly relates to an anti-dandruff composition as well as a preparation method and application thereof. The anti-dandruff composition comprises a plant composition, piroctone olamine and a conditioner, the plant composition comprises at least one of aster, garden burnet, Chinese pulsatilla root, cockscomb and myrobalan and sarcandra glabra, and the conditioner comprises PCA zinc or myristicamidopropyl PG-dimethyl ammonium chloride phosphate. According to the plant composition disclosed by the invention, the plant composition and the chemical reagent are matched with each other while the plant composition plays a synergistic antibacterial and antioxidant role, so that the use amount of the chemical reagent can be effectively reduced through the synergistic effect, the antibacterial effect equivalent to that of the chemical reagent can be achieved, and the antioxidant capability of the chemical reagent is improved; the anti-dandruff composition can realize scientific anti-dandruff starting from an integral balance idea of'micro-ecology-barrier function-sebum secretion '.

The described invention is a disinfectant that has a bactericidal and fungicidal effect. Optimally, the agent is diluted more than 70 times before use, thereby achieving pH neutrality of the solution. The agent is also effective, bactericidal and fungicidal, and when diluting the final formulation up to 200 times. The improvement of the disinfectant is based on the presence of the active substance didecyldimethylammonium chloride. The agent also contains sodium chlorite. In this invention, polyethylene glycol, in addition to the function of a polymer carrier, also has the function of a stabilizer of the solution of the active substance, a non-ionic surfactant.

The invention discloses an alcohol-free washing-free bacteriostatic hand washing gel and a preparation method thereof. The alcohol-free washing-free bacteriostatic hand washing gel is prepared from the following components in percentage by weight: 0.05%-0.1% of chitosan quaternary ammonium salt, 0.03%-0.05% of polyhexamethylene biguanide hydrochloride, 0.1%-0.3% of didecyl dimethyl ammonium chloride, 0.1%-2.0% of a gel matrix, 0.1%-25% of a humectant and the balance of purified water. The product has good sterilizing and moisturizing effects.

The application discloses an active oxygen response type bacteriostatic and repair promoting hydrogel and a preparation method and application thereof, the hydrogel is formed by disulfide bond cross-linked hydrogel in response to active oxygen free radicals in the vagina of vaginitis patients through thiol modified hyaluronic acid (HASH), and can enhance in-vivo retention by thiol and vaginal tissue interaction. Cationic surfactant such as didecyldimethylammonium chloride (DDAC) as the bacteriostatic component of the hydrogel, efficiently killing pathogenic bacteria while having good biocompatibility, and is not prone to cause bacterial drug resistance. As a natural immune regulator, beta-glucan regulates the vaginal microenvironment, promotes the polarization of macrophages into anti-inflammatory M2 type and promotes cell migration, etc., to promote the repair of the vaginal immune barrier, regulate the vaginal flora, and reduce the probability of vaginitis recurrence. The HASH hydrogel provides an efficient, convenient and highly transformative potential strategy to provide more choices for the treatment of vaginitis.

The invention belongs to the technical field of photovoltaic cell processing materials, and relates to an RCA cleaning additive for a TOPCon cell POLY FINGER process and a preparation method of the RCA cleaning additive. The invention relates to an RCA cleaning additive for a TOPCon battery POLY FINGER process. The RCA cleaning additive comprises the following substances in parts by weight: 0.5-5 parts of a protective agent; 0.1 to 2.0 parts of a catalyst; 0.2 to 3.0 parts of a stabilizing agent; 0.3 to 2.5 parts of a selective adsorbent; 0.1 to 3.0 parts of a surfactant; 0.05 to 1.0 part of a defoaming agent; the protective agent is prepared from at least two of sodium 3-carboxybenzenesulfonate, tetraethyl ammonium acetate, methyl tributyl ammonium chloride, benzyl trimethyl ammonium chloride and bis (2-ethoxyl) dimethyl ammonium chloride. The selection range of the core component and the protective agent of the RCA cleaning additive is defined, and a multi-component synergistic effect system is constructed through reasonable matching. According to the present invention, the problems of single protection and non-uniform corrosion of the existing additive are effectively solved, the corrosion requirement of the laser region can be met, the POLY layer can be comprehensively protected, the foundation is laid for the subsequent battery passivation and the performance improvement, and the core cleaning requirement of the TOPCon battery POLY FINGER process can be met.

The invention provides an MgAl2O4 carrier as well as a preparation method and application thereof, and relates to the technical field of catalysts. The preparation method comprises the following steps: mixing urea, soluble aluminum salt, soluble magnesium salt, polydiene dimethyl ammonium chloride and water, and carrying out a hydrothermal reaction to obtain a precipitate; the molar ratio of the urea to the aluminum element in the soluble aluminum salt to the magnesium element in the soluble magnesium salt to the polydiene dimethyl ammonium chloride is 4.5: 2: 1: (1-2); and sequentially drying and calcining the precipitate, so as to obtain the MgAl2O4 carrier. The prepared MgAl2O4 carrier is used as a catalyst carrier to be used in a high-temperature and high-pressure methane and carbon dioxide dry reforming reaction, excellent stability is shown, and the MgAl2O4 carrier is evaluated for 230 h under the high-temperature and high-pressure conditions of 850 DEG C and 2 MPa, has no obvious difference in morphology before and after the reaction, has small change in specific surface area, and shows excellent mechanical strength and chemical stability.

The invention discloses a sludge-based flocculation-nutrition multifunctional agent, a preparation method and application of the sludge-based flocculation-nutrition multifunctional agent in muck mud recycling, and belongs to the technical field of solid waste recycling. The invention relates to a preparation method of a sludge-based flocculation-nutrition multifunctional agent. The preparation method comprises the following steps: carrying out hydrothermal carbonization reaction on sludge under the condition of adding NaOH to obtain and separate hydrothermal carbon and nitrogen-rich water phase residues; leaching the hydrothermal carbon in HCl to obtain and separate acid-soaked hydrothermal carbon and a phosphorus-rich leaching solution; mixing the nitrogen-rich water phase residues and the phosphorus-rich leaching liquor, and standing to obtain humic acid precipitate; after sufficient precipitation, NaOH and MgCl2 are added into the mixture, and struvite precipitation is obtained; and putting the acid-soaked hot charcoal, the humic acid precipitate and the struvite precipitate into a polydiene dimethyl ammonium chloride solution, stirring, and separating to obtain the humic acid / struvite composite material. The multifunctional agent can be used for realizing deep resource utilization of the sludge and fully recovering organic matters, nitrogen, phosphorus and the like contained in the sludge.

The invention belongs to the technical field of energy materials, and particularly relates to a Mo2N-C hybrid nanosheet and a preparation method and application thereof. According to the preparation method disclosed by the invention, an organic-inorganic hybrid poly dimethyl diallyl ammonium chloride (PDDA) intercalated MoS2 (MoS2 / PDDA) nanosheet is used as a precursor, and the Mo2N nanoparticle hybrid material (Mo2N-C) coated with the graphene nanosheet is prepared through one-step nitridation. The preparation method provided by the invention can effectively improve the utilization rate of the material, and is simple to operate and high in universality. The small-size Mo2N nanoparticles formed by the method not only can provide abundant electrochemical energy storage sites, but also can be used as supporting points among carbon layers to form abundant channels, and the existence of the graphene carbon layer can increase the uniform dispersion degree of the Mo2N nanoparticles, so that the Mo2N structure is stabilized, and the specific capacitance is further improved.

The invention discloses a compound washing preservative as well as a preparation method and application thereof, and the compound washing preservative comprises the following components or consists of the following components: a group: phenoxyethanol; group b: one or more of ethylhexylglycerin, benzethonium chloride, didecyl dimethyl ammonium chloride, benzoic acid, benzyl alcohol and dichlorobenzyl alcohol; and the group c comprises at least one or more of deionized water, ethylene glycol, propylene glycol and butanediol. The preservative composition provided by the invention has the characteristics of mildness, no irritation, moisture retention, no residue and environmental friendliness, the preservative effect is better than that of single use of phenoxyethanol under the condition of lower dosage, and the purposes of composite synergism, additive amount reduction and application cost control are achieved by exerting the respective characteristics of various preservatives.

Provided herein is a mild, natural, sustainable, silicon-free, waterless, solid hair color protection and UV protection composition comprising of p-methoxy cinnamidopropyl behenyl dimethyl ammonium chloride, one or more structuring agent like fatty alcohol, natural conditioning agents like butters, natural vegetable / fruit / nut oil and its corresponding esters. The pH of the solid hair color protection composition is 3.5 to 5.5.

The application provides a MgAl2O4 carrier and a preparation method and application thereof, and relates to the technical field of catalysts. Urea, a soluble aluminum salt, a soluble magnesium salt, polydiallyldimethylammonium chloride and water are mixed to carry out a hydrothermal reaction to obtain a precipitate; the molar ratio of the urea, aluminum elements in the soluble aluminum salt, magnesium elements in the soluble magnesium salt and the polydiallyldimethylammonium chloride is 4.5:2:1:(1-2); the precipitate is sequentially dried and calcined to obtain the MgAl2O4 carrier. The prepared MgAl2O4 carrier is used as a catalyst carrier in a high-temperature and high-pressure dry reforming reaction of methane and carbon dioxide, and excellent stability is exhibited; under high-temperature and high-pressure conditions of 850 DEG C and 2 MPa, the MgAl2O4 carrier is evaluated for 230 hours, and the morphology of the MgAl2O4 carrier before and after the reaction has no obvious difference, the specific surface area changes little, and excellent mechanical strength and chemical stability are shown.

This invention relates to the field of chemical additives for oil and gas field development. It discloses an oil and gas field bactericide and its preparation method, comprising the following components by mass percentage: glutaraldehyde 8%-18%; quaternary ammonium salt 12%-22%; disodium ethylenediaminetetraacetate 2%-6%; polyethylene glycol 400 1%-3%; and the balance being water. The quaternary ammonium salt is a mixture of dodecyl dimethyl benzyl ammonium chloride and disedecyl dimethyl ammonium chloride in a mass ratio of 1.5:1-2.5:1. This invention, through synergistic compounding of multiple components, significantly improves the stability of the bactericide under high temperature, high mineralization, and weakly alkaline environments, achieving an active substance retention rate of ≥92% after 72 hours. This solves the problems of easy degradation of glutaraldehyde and poor stability of conventional formulations. The product has a broad bactericidal spectrum and good long-lasting effect, with low concentrations effective against three key types of bacteria, inhibiting microbial corrosion and blockage. The compounded system is less prone to drug resistance, and the preparation process is mild and simple, suitable for industrial production, and can meet the long-term stable bactericidal requirements of oil and gas fields.

The invention relates to cleansing mousse and a preparation method thereof. The cleansing mousse comprises the following components: a composition with oil-control and anti-inflammatory effects, a chelating agent, a skin conditioner, a surfactant and water, the composition with the oil control and anti-inflammatory effects is prepared from sophorolipid, myristicamidopropyl PG-dimethyl ammonium chloride phosphate, creatine, a phellinus linteus extract, a hop extract and sodium chloride. The cleansing mousse provided by the invention not only has an excellent oil control effect, but also has an anti-inflammatory effect to a certain extent, has water locking and moisturizing effects, can achieve the moisturizing and oil control effects from multiple aspects of improving the water content of cuticle, repairing inflammatory response and the like, and has a targeted regulation effect on oily skin.

This invention belongs to the technical field of rubber hoses, specifically relating to an antibacterial hose for conveying food and its manufacturing process. It comprises an inner rubber layer coated with a quaternary ammonium salt antibacterial agent, a reinforcing layer treated with the antibacterial agent, and an outer rubber layer treated with antifungal agents. The quaternary ammonium salt antibacterial agent is a compound of food-grade alkyl dimethyl benzyl ammonium chloride and disdecyl dimethyl ammonium chloride. The reinforcing layer is prepared by impregnating / spraying polyester fibers with the quaternary ammonium salt antibacterial agent, followed by drying and curing, and then simultaneously winding and laminating it with food-grade low-density polyethylene. The outer rubber layer is uniformly distributed with a pre-dispersed antifungal agent, effectively inhibiting the growth of mold in the high-temperature and high-humidity environment of food processing. The antibacterial hose is manufactured through a process of spraying the inner rubber layer with the antibacterial agent, impregnating the reinforcing layer with the antifungal agent, pre-dispersing the antifungal agent, and mixing. This process achieves beneficial effects such as a >99.99% inhibition rate against common pathogenic bacteria, long-lasting antibacterial performance, zero-mold growth on the outer rubber layer (grade 0), stable mechanical properties, and excellent anti-aging properties.

The invention belongs to an important constituent part in the field of circular economy and environmental protection, and particularly relates to a compound deodorizing and sterilizing agent for a waste incineration plant and a preparation method of the compound deodorizing and sterilizing agent. The compound deodorizing and sterilizing agent is prepared from the following raw materials: natural cedar wood alcohol dew, eucalyptus oil, polyhexamethylene biguanide, alkyl dimethyl benzyl ammonium chloride, didecyl dimethyl ammonium chloride, nano polymerized quaternary ammonium salt, propylene glycol and a solubilizer. The main raw materials of the compound deodorizing and sterilizing agent are positively charged, and viruses and bacteria are carried on negatively charged dust for drifting; when air is disinfected, the positive charges actively adsorb viruses and bacteria; the compound deodorizing and sterilizing agent is sprayed on the surface of an object in a mist form to form a layer of film, and the film tightly wraps the adsorbed viruses and bacteria to inactivate the viruses and bacteria. The natural cedar wood alcohol dew is organically combined with the high-molecular polymer polyhexamethylene biguanide, the nano polymeric quaternary ammonium salt and other components, so that the odor of organic matters can be continuously and effectively fused and removed, and the purpose of purifying soil, water sources and air is achieved.

The invention relates to a surfactant for shampoo and a preparation method of the surfactant, and belongs to the technical field of surfactants. The surfactant for shampoo comprises a compound amino acid surfactant and a synergistic surfactant, the composite amino acid surfactant is prepared by taking corn oil, coconut oil and L-alanine as raw materials on the basis of an existing process, and the synergistic surfactant comprises sodium cocoyl isethionate, cocamidopropyl PG-sodium dimethyl ammonium chloride phosphate and potassium cocoyl hydrolyzed oat protein. After the sebum removing agent is added into the shampoo, the sebum removing effect can be better than that of SLES without high proportion and 4% mass content, the substitution effect is excellent, and the performance and the cost are both considered.

The invention relates to the technical field of hygienic products, and particularly discloses a special wet tissue for barbecue and a preparation method thereof. The special wet tissue for barbecue comprises a wet tissue carrier and wet tissue compound liquid, the wet tissue compound liquid takes an ethanol water solution as a solvent; a solute of the wet tissue compound liquid mainly comprises the following raw materials: fatty alcohol-polyoxyethylene ether, glyceryl triacetate, sodium cocoyl aminopropionate, lauramidopropyl betaine, dodecyl maltoside, polyvinylpyrrolidone, polyethylene glycol, didecyl dimethyl ammonium chloride, benzalkonium chloride, iodopropynyl butylcarbamate, a chelating agent and a foam inhibitor. The special wet tissue for barbecue has the advantages of being good in sterilization effect, high in dirt-removing power and good in cleaning effect, is suitable for cleaning the surfaces of barbecue tools such as a barbecue tray, a barbecue grill and a barbecue cover, and meets market requirements.

An object of the present invention is to provide a hair cosmetic which has an appropriate viscosity and can continuously provide a feeling effect such as hair manageability, finger combability, and softness.SOLUTION: (A) contains (a1) a highly polymerized silicone having a mean polymerization degree of 2000 to 20000 and a silicone having a mean polymerization degree of less than 2000, and (B) contains (b1) a dicocoyldimethylammonium chloride or a three chain-type quaternary ammonium salt-type cationic surfactant, the (C) higher alcohols include (c1) higher alcohols that are liquid at 25 °C and have a branched structure, and higher alcohols other than the (c1) components.SELECTED DRAWING: None

The invention provides a manganese zinc ferrite magnetic core and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing Fe (OH) 3, MnO and ZnO, and pre-sintering to obtain a pre-sintered material; (2) grinding the pre-sintered material, and adding an auxiliary material and a dioctadecyl dimethyl ammonium chloride additive to obtain a mixed material; (3) granulating the mixed material, and pressing to obtain a blank; and (4) sintering the blank to obtain the manganese-zinc ferrite magnetic core. Ferric hydroxide is used as an iron source, and a dioctadecyl dimethyl ammonium chloride additive is added to prepare manganese-zinc ferrite, so that the Bs of the material can be improved, and meanwhile, the loss is reduced.

The invention relates to the technical field of high-purity noble metal catalysts, in particular to a preparation method of high-purity iridium powder, which comprises the following steps: iridium dissolution and liquid preparation: adding chloroiridic acid into deionized water, stirring and dissolving, and filtering to remove insoluble substances to obtain an iridium solution A; complexing and precipitating iridium: adding didecyl dimethyl ammonium chloride into the iridium solution A, heating to 80-90 DEG C, separating out a large amount of yellow precipitate, and filtering when the solution becomes colorless from orange red to obtain iridium-containing precipitate B; recrystallization: adding the iridium-containing precipitate B into deionized water for recrystallization, and filtering to obtain an iridium-containing precipitate C; dissolving the iridium-containing precipitate C to prepare a solution, namely adding the iridium-containing precipitate C into dilute ammonia water with the pH value of 8-9 to be dissolved to obtain an iridium solution D, and filtering to remove trace insoluble impurities; and reducing to obtain high-purity iridium powder: adding hydrazine hydrate into the iridium solution D under a micro-boiling condition for reaction, filtering after reduction to obtain iridium powder, boiling and washing with aqua regia, filtering, washing with deionized water, and drying in vacuum to obtain the high-purity iridium powder.

The invention relates to the technical field of welding, and particularly discloses a water-soluble soldering flux and a preparation method thereof. The water-soluble soldering flux comprises the following raw materials in parts by weight: 6-12 parts of a borate covalent activator; 3 to 8 parts of cucurbituril hydrate; 0.01 to 2 parts of a corrosion inhibitor; 1-3 parts of a modified graphene quantum dot solution; 1-5 parts of a cyclic ether solvent; 0.5 to 2 parts of a metal organic framework material containing sulfydryl; 68 to 88.5 parts of deionized water; the modified graphene quantum dot solution is obtained by modifying graphene quantum dots through dioctadecyl dimethyl ammonium chloride. According to the soldering flux, the water-soluble soldering flux is combined with the cyclic ether solvent, so that the problem of later-stage water residue after decomposition and volatilization of an activating agent in the early stage of welding can be effectively solved, the problems of pseudo soldering, bubble defects and the like of welding spots are reduced, and the strength and reliability of the welding spots are effectively improved.