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33results about How to "Narrow and uniform particle size distribution" patented technology

Preparation method of microporous ultrafine high activity nickel carbonate

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.
Owner:郑景宜

Biological active microsphere and preparation method thereof

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.
Owner:佛山今兰生物科技有限公司

Long-acting mildew-resistant odor-removing moisture-absorbing polyamide fiber and preparing method thereof

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.
Owner:上海环谷新材料科技发展有限公司 +2

Atractylone lipidosome and preparation method 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.
Owner:SHENZHEN UNIV

Preparation of monodisperse styrene-acrylic composite emulsion nanoparticles

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.
Owner:JIANGSU SHUANGXING COLOR PLASTIC NEW MATERIALS

Preparation method and application of hollow mesoporous bioglass microspheres

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.
Owner:SOUTH CHINA UNIV OF TECH

Preparation method of high-purity antimony trioxide

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.
Owner:HUNAN LOUDI HUAXING ANTIMONY IND

Superfine active silica powder applied to electronic industry and preparation method thereof

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.
Owner:刘绍辉

Preparation of monodisperse styrene-acrylic composite emulsion nanoparticles

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.
Owner:JIANGSU SHUANGXING COLOR PLASTIC NEW MATERIALS
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