34results about How to "Narrow and uniform particle size distribution" patented technology

The invention relates to a soft magnet ferrite material, in particular to a broad-frequency high-magnet conductive rate low-wastage Mn-Zn soft magnet ferrite material as well as a preparation method for the material. The material consists of the main components of Mn-Zn series ferrite powder and the auxiliary components; the main components of the Mn-Zn series ferrite powder comprise Fe2O3, MnO and ZnO; wherein, Fe2O3 accounts for 68.8 to 70.2 percent of the total weight percentage, MnO accounts for 15 to 16.2 percent of the total weight percentage and ZnO accounts for 14.5 to 15.2 percent of the total weight percentage. The auxiliary components comprise Bi2O3, MoO, V2O5, CaCO3 and SnO2; the auxiliary components account for 0.8 to 1.8 percent of the total weight percentage. The preparation method of the material comprises the three steps of pre-processing, connecting multilevel sand milling in series and thermal processing, and can obtain the Mn-Zn soft magnet ferrite material which has the characteristics of broad frequency, high magnet conductive rate and low wastage.

The invention discloses a preparation method of microporous ultrafine high activity nickel carbonate, comprising the following steps of adopting mixed acid solution prepared from nitric acid, sulfuric acid and hydrochloride to dissolve metal nickel to prepare composite nickel salts used as raw materials; carrying out precipitation reaction with the composite nickel salts by using mixed percipitant of sodium carbonate, ammonium carbonate or ammonium bicarbonate and sodium hydroxide in a sealed drum type reaction pot under the action of high pressure CO2; and preparing the nickel carbonate by crushing and drying precipitates by adopting an integrative machine of crushing and drying after washing the precipitates. Shown through a particle image analyzer, a full-automatic specific surface area voidage analyzer and an SEM (Scanning Electron Microscope) photograph result, the nickel carbonate has fine size, the particle size of D50 can achieve 1-5 microns, the particle size specific surface area can achieve more than 300m2 / g, the content of carbon dioxide is larger than 20 percent, the nickel carbonate has multiple and small micropores, the powder nickel carbonate with the nickel content of 49-51 percent has narrow and uniform particle size distribution, wherein the particle size of D10 is 0.93 microns, the particle size of D50 is 1.81 microns and the particle size of D90 is 2.82 microns, and the dispersion of the powder nickel carbonate is favorable.

The invention discloses a biological active microsphere and a preparation method thereof. Based on molar percentage, the microsphere is composed of 16- 36% of CaO, 4% of P2O5 and 60-80% of SiO2 composition; the particle size of the microsphere 1-5 [mu]m; and the microsphere is in a hollow ball shape. The preparation method of the biological active microsphere comprises the following steps of preparing an acid catalyst polyethylene glycol solution A according to a proportion, adding tetraethoxysilane, triethyl phosphate and calcium nitrate terahydrate into the solution A respectively in order according to a molar ratio of 60-80 : 4 : 16-36 to form a gel B; hydrothermal ageing the gel B at the temperature of 60 DEG C and drying at the temperature of 37 DEG C to obtain a dry gel; grinding the dry gel and performing heat treatment on the grinded dry gel at the temperature of 600 DEG C-800 DEG C to obtain a target product. Compared with a conventional biological active microsphere, the biological active microsphere provided by the invention is in regular sphere shape with a hollow structure and smooth surface; the particle size of the microsphere 1-5 [mu]m; a particle size distribution range is narrow and uniform; and the biological active microsphere has excellent fluidity, syringeability and security and is simple in preparation process.

The invention relates to the technical field of pesticide preparation processing, in particular to a preparation method of a water-containing pesticide preparation. The preparation method at least comprises the following steps an active component is mixed with a wetting agent, a dispersing agent, a defoaming agent and water, the mixture is sanded and filtered, and water concentrated suspension isobtained; an emulgator, a thickener and oil base are mixed to obtain a mixture; and the water concentrated suspension and the mixture are mixed, and the water-containing pesticide preparation is obtained. The water-containing pesticide preparation with the active component grain size being distributed narrowly and uniformly, the median diameter being small and the storage stability being good canbe obtained through the preparation method.

The invention discloses a clean production method for high-purity cobaltosic oxide powder. The method comprises the following steps: using metal cobalt as an electrolytic anode, using soluble cobalt salt as electrolyte main salt and adding additives; adopting an electrochemical method to prepare a cobaltosic oxide precursor sediment; and then, drying and calcining the precursor sediment to obtain the cobaltosic oxide powder. The cobaltosic oxide powder produced by the method and the process can achieve the purity more than 99.7 percent, no additional precipitator is needed in the whole technological process, the added additives are all easy to wash without decomposition, and electrolyte and washing water can be recycled so as to avoid discharging sewage and generating waste gas. The method can adjust and control the appearance and the grain diameter distribution of the cobaltosic oxide powder by controlling the composition of the electrolyte, the cathode current concentration, the electrodeposition time and the calcining temperature and has the advantages of high product quality, simple production procedures, energy saving, environmental protection, and the like.

The invention relates to a long-acting mildew-resistant odor-removing moisture-absorbing polyamide fiber and a preparing method thereof. The preparing method includes steps of: (1) preparing a mildew-resistant odor-removing agent, with the active components of the mildew-resistant odor-removing agent being amine and copper, and a carrier being zirconium phosphate; and (2) adding the mildew-resistant odor-removing agent into polyamide 6, and spinning by a profile spinneret to obtain the long-acting mildew-resistant odor-removing moisture-absorbing polyamide fiber. Compared with the prior art, the long-acting mildew-resistant odor-removing moisture-absorbing polyamide fiber adopts the zirconium phosphate to carry a conjugate of the amine and the copper, has characteristics of high carrying amount and low adding amount. Release of the active components is controlled so that the fiber and fabrics thereof have mildew resistance, odor-removing performance and safety. A moisture-absorbing property brought by fiber profiling and mildew-resistant odor-removing properties are combined, thus promoting dissociation of the amine and the copper, and further improving mildew resistance and odor-removing properties of the fiber and the fabrics thereof.

The invention discloses an atractylone lipidosome containing atractylone and a lipidosome membrane material, wherein the atractylone is an Atractylis ovata extract, and the lipidosome membrane material is phosphatidylcholine or cholesterol. A method for preparing the atractylone lipidosome by adopting a supercritical fluid dispersing precipitation technology comprises the following steps of: (1) dissolving the atractylone and the lipidosome membrane material in a supercritical CO2 / alcohol mixed solvent, then obtaining a supercritical solution; (2) dissolving a surface active agent as a stabilizer in an aqueous medium, then obtaining a stabilizer solution; (3) and rapidly jetting the supercritical solution to the stabilizer solution at a certain pre-swelling pressure and pre-swelling temperature, and then obtaining an atractylone lipidosome mixed suspension by forcible dispersion and precipitation. The preparation process of the lipidosome is completed in the chemically inert CO2 medium; toxic organic solvents are not used, and the envelop rate of the lipidosome is improved, thereby effectively avoiding the agglomeration phenomenon caused by colliding among lipidosome particles, and ensuring the stability of the atractylone lipidosome in the preparation process.

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery cathode material and a preparation method and application thereof. The preparation method ofthe lithium ion battery cathode material comprises the following steps: hydrolyzing metal alkoxide to coat the surface of a nickel-cobalt binary precursor with a pseudo-boehmite layer to obtain a ternary precursor, wherein the chemical formula of the binary precursor is NixCoy (OH) 2, x and y are both greater than 0, and x + y = 1; and uniformly mixing the ternary precursor with a lithium salt, and sintering in an oxygen atmosphere to obtain LiNiaCobAlcO2, in which a, b and c are all greater than 0, and a + b + c = 1. The lithium ion battery cathode material is prepared by adopting the preparation method provided by the invention. The cathode material prepared by the preparation method provided by the invention has the characteristics of stable electrochemical performance, uniform chemicalcomponents, narrow and uniform particle size distribution and the like. The cathode material can be applied to preparation of a lithium ion battery cathode or a lithium ion battery.

The invention discloses an apramycin liposome. The apramycin liposome is a composition with a spherical or ellipsoidal double-film structure, and is formed by encapsulating apramycin with a liposome film. A preparation method comprises the following steps: 1) dissolving the apramycin and the liposome film with ethanol to obtain a mixed solution, and dissolving the mixed solution into supercritical CO2 to obtain a supercritical solution, wherein the mass ratio of the apramycin to the liposome film is (1 : 1) to (1 : 30); the liposome film is phosphatidylcholine, or a mixture of phosphatidylcholine and cholesterol; 2) dissolving a stabilizer into an aqueous medium to obtain a stabilizer solution; 3) spraying the supercritical solution to the stabilizer solution at an expansion pressure of 15-30MPa and a pre-expansion temperature of 323-343K, dispersing and precipitating to obtain an apramycin liposome suspension.

The invention relates to a styrene-acrylic composite emulsion, particularly preparation of silicon-containing styrene-acrylic composite emulsion nanoparticles, which comprises the following steps: 1. pre-emulsification: adding an emulsifier and a seed monomer to carry out pre-emulsification; 2. adding an initiator to carry out seed emulsion polymerization; and 3. adding the rest of monomer, emulsifier, initiator and silane coupling agent into the polymerization system to carry out polymerization, thereby obtaining the silicon-containing nano polyacrylate composite emulsion. The whole preparation process has a definite procedure and is simple to operate. By adopting free radical copolymerization, the silicon-containing acrylates are introduced into the styrene-acrylic polymer emulsion by copolymerization, thereby preparing the monodisperse nano silicon-containing styrene-acrylic emulsion. The product integrates the advantages of silicon and nano styrene-acrylic emulsion. The monodisperse styrene-acrylic composite emulsion has small-size effect, surface effect, quantum size effect, macroscopic tunneling effect and the like. Therefore, related materials have electric, magnetic, thermal and optical sensitivity, and the surface stability is obviously different from that of micron particles. The invention relates to the application fields of chemistry, materials, biology, medicine, textile, paper making and the like, and has high use value.

The invention discloses a preparation method and application of hollow mesoporous bioglass microspheres. The method comprises the steps that hexadecyl trimethyl ammonium bromide is used as a mesoporous template, in an ethanol aqueous solution, ammonium hydroxide is used as hydrolyst, tetraethyl orthosilicate is used as a silicon source, and calcium nitrate terahydrate is used as a calcium source;firstly, nanoscale bioglass microspheres are prepared, then, by using the strength difference of the surfaces of the mesoporous microspheres and internal silicon-oxygen bonds, through hydrothermal selectivity etching, hollow structures are obtained, a residual template agent is removed through high temperature, and finally the submicron-order hollow mesoporous bioglass microspheres are obtained. The preparation technology is simple, the cost is low, and the microspheres are easy to amplify and synthesize. The prepared microspheres of the hollow mesoporous structures have high specific surfacearea and pore volume, mesopores run through a shell layer, the average pore diameter is larger than 10 nm, and the cavity sizes of the microspheres can be adjusted and controlled through the hydrothermal temperature and time. When being used as medical carriers, the microspheres have high medicine carrying amount and a good slow-release effect.

The invention provides glycosyl polyether compound lipidosome as well as a preparation method and a medicine thereof. The glycosyl polyether compound lipidosome comprises a glycosyl polyether compound and a lipidosome, and the lipidosome wraps the glycosyl polyether compound to form a double-layer membrane. The preparation method comprises the following steps: dissolving lipidosome and a glycosyl polyether compound by using an organic solvent; and carrying out suspended evaporation to remove the organic solvent, mixing with a water-phase medium, and carrying out ultrasonic treatment. The provided medicine comprises the glycosyl polyether compound liposome. The glycosyl polyether compound lipidosome provided by the invention is small in particle size and narrow and uniform in particle size distribution, fully ensures the physiological efficacy of the glycosyl polyether compound, and is simple in preparation method.

The invention discloses a preparation method of high-purity antimony trioxide, and belongs to the technical field of antimony trioxide preparation. The preparation method comprises the following steps of: adding crude antimony ore into a hydrochloric acid solution for dipping, introducing chlorine, adding iron powder into an obtained antimony chloride mixed solution, and performing a reaction to obtain an antimony chloride solution; then adding a proper amount of 4 mol / L sodium hydroxide solution with the pH value of 8-9, performing stirring, filtering, washing and drying, and performing roasting in an air atmosphere to obtain antimony trioxide; gasifying the antimony trioxide into liquid, introducing compressed air and a composite lead removal agent, gasifying and quenching prepared antimony trioxide powder, thereby obtaining the high-purity antimony trioxide. According to the method provided by the invention, simplicity in preparation is realized, the usage amount of the composite lead removal agent is small, the cost is relatively low, the composite lead removal agent can be recycled, and no burden is caused to the environment; the purity of the prepared antimony trioxide can reach 99.5% at most, the particle size can reach the nanoscale, and the particle size distribution is uniform.

The invention discloses a method for preparing a nano metal organic framework material by using an internal circulation rotating packed bed, which comprises the following steps: 1) stirring and dissolving a metal salt in a solvent to prepare a metal salt solution; stirring and dissolving an organic ligand in a solvent to prepare an organic ligand solution; 2) preparing a precursor solution; 3) adding the precursor solution into a cavity of the internal circulation rotating packed bed through a feeding hole to serve as a reaction substrate; starting a motor, respectively pumping the metal saltsolution and the organic ligand solution into the internal circulation rotating packed bed for circulation after the motor stably operates, continuously carrying out precipitation and crystallizationreaction for 0.01-5 h, and taking out a reaction material to prepare a suspension; and 4) filtering and washing to obtain a clean filter cake, and drying the filter cake to obtain the product. The particle size of the product prepared by the method is 1-100 nanometers, the particle size distribution is uniform, the morphology is regular, and the product is a nano metal-organic framework material with a determined crystal form structure.

The invention discloses a febrifugine liposome and a preparation method thereof. The preparation method comprises the following steps: dissolving febrifugine and a liposome encapsulating material in a supercritical CO2 / ethanol mixed solvent to obtain a supercritical solution; dissolving a surfactant used as a stabilizer in a water phase medium to obtain a stabilizer solution; and spraying the supercritical solution to the stabilizer solution under 20-30 MPa at 300-350 K, and carrying out dispersion and precipitate precipitation to obtain the febrifugine liposome, wherein the liposome encapsulating material is tricaprylin, and a mass ratio of febrifugine to the liposome encapsulating material is 1:10 to 1:20; a volume ratio of ethanol to CO2 in the supercritical CO2 / ethanol mixed solvent is 1:6 to 1:10; the surfactant is tween80; the water phase medium is a phosphate buffer solution; and the concentration of the stabilizer solution is 1-10 wt%. The method for preparing the febrifugine liposome by adopting a supercritical CO2 fluid technology has the advantages of no toxic organic solvents and mild conditions, and allows the encapsulating rate to be higher than 80%.

The invention discloses a method for preparing nanoliposomes by supercritical CO2 fluid, which comprises the following steps of: (1) dissolving a certain amount of lipid membrane materials and cosurfactant into supercritical CO2 in a supercritical reaction kettle, and solubilizing a certain amount of distilled water to form a supercritical micro-emulsion; (2) pre-expanding the supercritical micro-emulsion under set pressure and temperature and then rapidly jetting into a water phase medium in a supercritical collection kettle through a nozzle at a certain flow velocity, and dispersing and settling out to form liposome mixed suspension liquid; and (3) continuously dissolving CO2 through the supercritical collection kettle and removing residual ethanol in the liposome mixed suspension liquid, metering by a rotor metering gauge and evacuating, and collecting the liposome mixed suspension liquid in the supercritical collection kettle. In the technology, the micro-emulsion of the lipid membrane materials formed in the supercritical CO2 is used as a template for assembling the lipid, and the lipid is collected by using the supercritical rapid expansion technology so as to provide a new path for preparing the nanoliposomes.

The invention provides superfine active silica powder applied to the electronic industry and a preparation method thereof, and the preparation method comprises the following steps: crushing and grading raw material quartz sand to obtain unmodified primary silica powder; adding purified water into the unmodified primary silica powder to prepare slurry; heating the slurry to 110-140 DEG C, and then adding a mixture of a modifier and an activating agent to carry out primary modification reaction; after the primary modification reaction is carried out for 5-8 minutes, adding the mixture of the modifier and the activating agent again, continuously keeping the temperature at 110-140 DEG C, and carrying out secondary modification reaction to obtain a modified material; and drying the modified material to prepare a filter cake, and crushing and grading to obtain the superfine active silica powder. According to the preparation method disclosed by the invention, a twice crushing and grading process and a wet modification process are adopted, so that the prepared superfine active silica powder has the characteristics of being easy to combine with epoxy resin, narrow and uniform in particle size distribution, good in coating effect, low in water content and the like required by the electronic industry, and can be widely applied to various electronic industries as a functional inorganic filler.

The invention relates to a styrene-acrylic composite emulsion, particularly preparation of silicon-containing styrene-acrylic composite emulsion nanoparticles, which comprises the following steps: 1. pre-emulsification: adding an emulsifier and a seed monomer to carry out pre-emulsification; 2. adding an initiator to carry out seed emulsion polymerization; and 3. adding the rest of monomer, emulsifier, initiator and silane coupling agent into the polymerization system to carry out polymerization, thereby obtaining the silicon-containing nano polyacrylate composite emulsion. The whole preparation process has a definite procedure and is simple to operate. By adopting free radical copolymerization, the silicon-containing acrylates are introduced into the styrene-acrylic polymer emulsion by copolymerization, thereby preparing the monodisperse nano silicon-containing styrene-acrylic emulsion. The product integrates the advantages of silicon and nano styrene-acrylic emulsion. The monodisperse styrene-acrylic composite emulsion has small-size effect, surface effect, quantum size effect, macroscopic tunneling effect and the like. Therefore, related materials have electric, magnetic, thermal and optical sensitivity, and the surface stability is obviously different from that of micron particles. The invention relates to the application fields of chemistry, materials, biology, medicine, textile, paper making and the like, and has high use value.

The grinding machine comprises motor drive portion, motor and motor base, abrasive disk, grinding cylinder and moving rollers, bearing seat, main shaft, main column, base , diaphragm pump and condenser which are connected together. The motor drive portion is connected with main shaft by means of bearing seat and fixedly connected on the motor base, the abrasive disk is embedded on the main shaft, feeding tube is connected with diaphragm pump, and cooling water inlet and outlet pipes are connected with condenser, the motor base is fixedly connected on the vertical column, the vertical column is fixedly connected on base, and the grinding cylinder is fixedly connected on the vertical column. It is high in grinding efficienc, short in technological process, narrow and uniform in grain size distribution, high in product quality, low in cost and long in life.

The invention relates to a preparation method of a surface-modified colloidal state silicon nanocrystal. The preparation method comprises the following steps that (1) a mixed liquid of nanometer silicon powder and an organic solvent is subjected to laser cauterization treatment under the stirring state; (2) the mixed liquid after laser cauterization treatment is subjected to separation treatment, and the colloidal state silicon nanocrystal is obtained. The particle size distribution range of the colloidal state silicon nanocrystal prepared with the preparation method is controllable, the dispersity is good, no agglomeration occurs, and oxidation can be avoided.

The invention discloses a preparation method of a high-nickel ternary lithium ion battery positive electrode material and a product thereof, aluminum isopropoxide, an isopropoxy zirconium isopropanol compound or tin isopropoxide is used as a raw material, and the surface of Ni0. 93Co0. 07 (OH) 2 is coated with a layer of hydrolysis product through hydrolysis to obtain a ternary precursor; and uniformly mixing the ternary precursor with a lithium salt, sintering in an oxygen atmosphere to obtain Li [(Ni < 0.93 > Co < 0.07 >) < 0.95 > Al < 0.05 >] < x > Zr < y > O < 2 > or Li [(Ni < 0.93 > Co < 0.07 >) < 0.95 > Al < 0.05 >] < x > Sn < y > O < 2 >, x and y are both greater than 0, and the sum of x and y is equal to 1. According to the preparation method provided by the invention, the crystal structure of the material is stabilized by virtue of doping elements in the shell and the bulk phase, and the dissolution of transition metal ions in the active material in a long-term circulation process is avoided, so that the comprehensive electrochemical performance of the material is improved.

The invention provides a novel polymer microparticles for carrying a physiologically active substance and a method for preparing the same. The polymer microparticles for carrying a physiologically active substance can provide an analytical reagent which has high analytical precision and sensitivity and can be prepared stably; can easily and precisely control the amount of functional groups carrying the physiologically active substance; can introduce, to latex particle surfaces, a hydrophilic compound for suppressing a nonspecific reaction; and can be prepared to have a narrow and uniform particle size distribution. The polymer microparticles for carrying a physiologically active substance are obtained by polymerizing a monomer, a radical polymerization initiator, and an emulsifier, and the emulsifier is an amphiphilic block polymer expressed by general formula (1) below.

The invention relates to a preparation method of a surface-modified colloidal state silicon nanocrystal. The preparation method comprises the following steps that (1) a mixed liquid of nanometer silicon powder and an organic solvent is subjected to laser cauterization treatment under the stirring state; (2) the mixed liquid after laser cauterization treatment is subjected to separation treatment, and the colloidal state silicon nanocrystal is obtained. The particle size distribution range of the colloidal state silicon nanocrystal prepared with the preparation method is controllable, the dispersity is good, no agglomeration occurs, and oxidation can be avoided.

The invention discloses an apramycin liposome. The apramycin liposome is a composition with a spherical or ellipsoidal double-film structure, and is formed by encapsulating apramycin with a liposome film. A preparation method comprises the following steps: 1) dissolving the apramycin and the liposome film with ethanol to obtain a mixed solution, and dissolving the mixed solution into supercritical CO2 to obtain a supercritical solution, wherein the mass ratio of the apramycin to the liposome film is (1 : 1) to (1 : 30); the liposome film is phosphatidylcholine, or a mixture of phosphatidylcholine and cholesterol; 2) dissolving a stabilizer into an aqueous medium to obtain a stabilizer solution; 3) spraying the supercritical solution to the stabilizer solution at an expansion pressure of 15-30MPa and a pre-expansion temperature of 323-343K, dispersing and precipitating to obtain an apramycin liposome suspension.

The invention relates to a technology for crushing a medium material by using high speed airflow. The technology comprises the following steps: 1, adding the medium material into an airflow crusher crushing chamber, and setting a granularity requirement; 2, impacting the medium material by high speed airflows generated by a plurality of nozzles of the airflow crushing chamber to make the medium material mutually bumped and rubbed under the action of the high speed airflows and crushed in order to realize micronization; and 3, separating through a grader, discharging and collecting the medium material with qualified granularity with airflow, returning coarse grains to the crushing chamber, and continuously crushing until the preset granularity requirement is met. Compared with the prior art, the technology has the advantages of fine granularity and narrow and uniform particle size distribution of the crushed material, and no influences on the activity of temperature-sensitive components due to the crushing temperature not exceeding 40DEG C. The particles are fine, so the prepared medium has good dissolvability and good quality. A totally closed self bump crushing mode adopted in the invention reduces the pollution possibility.

A preparation method of carbon quantum dots for penetrant testing of stone cultural relics comprises the following steps: mixing ginkgo leaves serving as a raw material with deionized water, performing high-pressure cooking at 110-125 DEG C and 180-200KPa for 2-3 hours, filtering out filtrate, and removing impurities. The carbon quantum dots prepared by using the ginkgo leaves as the raw material have high fluorescence quantum yield (up to 6.2%), and have excellent fluorescence intensity; the particle size distribution is narrow and uniform and is about 3.1 nm, and the carbon quantum dots are excellent in stability and not prone to sedimentation and aggregation; and very strong fluorescence intensity can still be detected under the ultra-low concentration of 2 ng / L, and the method is suitable for penetrant testing of cultural relics with relatively large volumes and long internal crack paths.