239results about How to "Fine and uniform particle size" patented technology

The invention discloses a metal evaporating device and a method for preparing ultrafine metal powder by using the same. The device comprises a crucible (1), a plasma transferred arc torch (2), a plasma transferred arc (3), a graphite (4), a power supply and a lead, which form an electric loop, wherein an air inlet pipe (2.1) from which air enters, is arranged in the plasma transferred arc torch (2); the plasma transferred arc (3) is arranged between the plasma transferred arc torch (2) and the crucible (1); the graphite (4) is arranged on the bottom of the crucible (1); and a feed pipe (2.2) which is used for feeding metal raw materials is arranged above the plasma transferred arc (3). The structure of the metal evaporating device has the advantages that the energy of the plasma transferred arc is fully utilized, the metal output and the metal evaporating efficiency are increased, the energy consumption is lowered, and the ultrafine metal powder which has uniform particle size and is free from large particle metal residual is acquired.

The invention provides a method for preparing superfine spherical iron nitride powder, and belongs to the technical field of powder preparation. In the method, the superfine spherical iron nitride powder is synthesized and prepared by taking carbonyl iron liquid as a raw material, ammonia (or nitrogen) plasma as nitridation atmosphere and radio frequency (RF) plasma as a heat source for the reaction. The method comprises the following steps of: evaporating the carbonyl iron liquid; feeding the liquid steam into the nitrogen plasma by carrier gas; and reacting decomposed carbonyl iron steam with the nitrogen plasma to obtain the superfine spherical iron nitride powder. The method is characterized in that the nitridation and spheroidization of the carbonyl iron liquid steam are finished in one step by taking the radio frequency (RF) plasma as the heat source so as to prepare the superfine spherical iron nitride powder. The superfine spherical iron nitride powder produced by the method has fine and uniform particle size, high sphericity and high spheroidization rate; the process is simple; and magnetic fluid prepared by the method has high saturation magnetization.

The invention relates to environmental-friendly pigment bismuth yellow and a production method thereof. The production method is characterized by comprising the steps of: firstly placing solid bismuth into a mixed acid solution made of nitric acid and hydrochloric acid for soaking, then taking out for reacting with a nitric acid solution to obtain a bismuth nitrate solution; keeping the nitric acid in an excessive state, then mixing and dissolving ammonium metavanadate or ammonium metavanadate and ammonium molybdate into ammonia water to obtain a vanadium-containing or vanadium and molybdenum-containing ammonia water mixed solution; under the condition of continuously stirring, simultaneously adding the bismuth nitrate solution and the mixed solution into a reactor containing a dispersing agent and a bottom fluid to obtain a light yellow sediment; and washing, drying and pulverizing according to a conventional method, finally, calcining and sieving to obtain the environmental-friendly pigment bismuth yellow with uniform granularity. The invention has the advantages of easy control of process conditions, good product dispersity, fine and uniform granularity, good powder activity, wide source and high utilization ratio of raw materials and better economic feasibility.

The invention discloses a method for preparing a zinc oxide-based sputtering target material. The method comprises the following steps of: performing die pressing on doped zinc oxide nano-powder at the pressure of between 30 and 150 MPa and maintaining the pressure for 30 to 300 seconds; performing isostatic cool pressing on the doped zinc oxide nano-powder at the pressure of between 120 and 300 MPa and maintaining the pressure for 60 to 600 seconds; heating the doped zinc oxide nano-powder to the temperature of between 950 and 1,300 DEG C at a heating rate of between 5 and 10 DEG C per minute, and maintaining the temperature for 1 to 30 minutes; cooling the doped zinc oxide nano-powder to the temperature of between 650 and 1,100 DEG C at a cooling rate of between 10 and 100 DEG C per minute and maintaining the temperature for 2 to 40 hours; and finally, cooling the doped zinc oxide nano-powder to the room temperature at a cooling rate of between 0.5 and 10 DEG C per minute, and performing cutting and polishing on the doped zinc oxide nano-powder to obtain the zinc oxide-based sputtering target material. By adopting specific two-step sintering parameters, the method is used for preparing the target material of which the density is over 98 percent, the grain size is very small and uniform and is between 0.5 and 20 mu m, and the doped components are uniform at a low sintering temperature.

This invention discloses a method for preparing laminated alpha-Ti3(PO4)2, which mixes Ti salt with deionized water in the proportion of 1 :4-10 to get deposit after being hydrolyzed fully to be cleaned and mixed in the proportion of 1 : 20-30 : 3-15, then the concentration of H3PO4 in the mixed solution is 4-12mol/L, then transfers the mixed solution into a high pressure kettle and reacts for 4-24 h under 150-200deg.C to be cooled to room temperature t obe cleaned to 3-7 pH value to be dried to get laminated alpha-Ti3(PO4)2.

A process for preparing nano-class yttrium oxide powder features that under the existance of surfactant, the solution of yttrium ions reacts on the alkaline solution under normal temp. and pressure. Its advantages are fine granularity (10-60 nm), high dispersity and low cost.

The invention provides a preparation method of polyimide foam plastic. The method comprises the steps as follows: firstly, after dianhydride is mixed with low-level aliphatic alcohol, an esterification reaction is performed, and a diacid diester solution is obtained; then the obtained diacid diester solution is mixed with polymerized monomer amine and polyamic acid powder to obtain a mixed solution; and finally, the obtained mixed solution is sequentially subjected to foaming and thermal imidization after concentration to obtain the polyimide foam plastic. The invention further provides the polyimide foam plastic and the preparation method thereof, and the method comprises the step that polyamic acid powder is added when dianhydride and isocyanate are used for preparing the polyimide foam plastic. According to the invention, the polyamide acid powder serves as a nucleating agent, so that a cell of an objected formed by foaming of polyimide is fine and smooth, that is, the size distribution of the cell is improved, the cell uniformity is better, then the flexibility performance and the like of the polyimide foam plastic are improved; meanwhile, the heat resistance is not influenced; and besides, the preparation method of the polyimide foam plastic is concise in processing, and low in energy consumption and production cost.

The invention discloses a novel attapulgite supported palladium hydrogenation catalyst and a preparation method thereof. Acidized attapulgite clay is used as a carrier, potassium borohydride or hydrazine hydrate is used as a reducer, and a soluble palladium salt is reduced to palladium nano particles which are loaded on the acidized attapulgite clay. In the attapulgite loaded palladium hydrogenation catalyst prepared by the method of the invention, the palladium nano particles are fine and uniform and are highly dispersed on the surfaces of carbon nano tubes, and compared with the active carbon or graphite loaded palladium catalyst, the attapulgite loaded palladium hydrogenation catalyst has high activity and selectivity for hydrogenating cinnamyl aldehyde to prepare phenylpropyl aldehyde.

The invention discloses a palladium-cobalt/graphene nano electro-catalyst and a preparation method thereof. According to the palladium-cobalt/graphene nano electro-catalyst, palladium serves as an active ingredient, cobalt serves as a cocatalyst, and graphene serves as a carrier; and in the catalyst, the mass fraction of the palladium is 10-40%, the mass fraction of the cobalt is 5-30%, and the balance is the carrier. According to the preparation method of the catalyst, graphite oxide nanosheets are ultrasonically dispersed into polylol, palladium salt liquid, cobalt salt liquid and sodium acetate liquid are then added and fully mixed uniformly, the mixture is then transferred into a microwave hydrothermal reaction kettle, and the filtering, washing and drying processes are carried out after reaction, thereby obtaining the palladium-cobalt/graphene nano electro-catalyst. The preparation method disclosed by the invention has the advantages of energy saving, high speed, simple process and the like; and the particle sizes of palladium and cobalt nanoparticles in the prepared palladium-cobalt/graphene nano electro-catalyst are uniform. The catalyst has high electro-catalytic activity to the electrooxidation of formic acid and is widely applied to fuel cells.

The invention provides a preparation method of superfine cupper powder, which takes copper slag generated by hydrometallurgy of zinc as a raw material and is characterized by comprising the following steps: soaking the cupper slag in a sulfuric acid solution for pretreatment; filtering and drying; carrying out oxidization roasting to obtain roasted cupper slag; leaching the roasted cupper slag out by the sulfuric acid solution to obtain lixivium i.e. copper-bath; carrying out purification treatment on the copper-bath; and adjusting the pH value of the purified copper-bath; adding glucose in the copper-bath for pre-reduction to obtain the cuprous oxide sediment; adding a hydrazine hydrate solution in the cuprous oxide sediment to carry out reduction reaction to obtain solid reduced copper powder; and filtering the reduced copper powder, washing, drying and carrying out polished finish to obtain the superfine copper powder. The invention has the copper recovering rate as high as over 95% and simple process, produces the superfine cupper powder by hydrometallurgy of zinc with low cost and wide sources, and has the economic feasibility of industrialization production in a large scale.

The invention discloses a fish compound traditional Chinese medicinal preparation prepared from raw materials including rhubarb, acanthopanax, radix astragali, hawthorn and liquorice according a certain weight ratio. A method for preparing fish compound traditional Chinese medicinal preparation comprises the following steps of: A. washing and drying the rhubarb, the acanthopanax, the radix astragali, the hawthorn and the liquorice in the sun; B. respectively crushing and sieving the rhubarb, the acanthopanax, the radix astragali, the hawthorn and the liquorice to ensure the granularity reaches 140-200 mu; and C. weighing up the rhubarb, the acanthopanax, the radix astragali, the hawthorn and the liquorice according to the ratio and mixing and subpackaging after uniformly mixed to obtain the fish compound traditional Chinese medicinal preparation. The method has the advantages of feasibility, convenient operation, reasonable formulation and convenient use; traditional Chinese medicines have wide sources, low price, remarkable effects and no toxic or side effects; various components mutually act; and the invention simultaneously has two properties of nutrition and medicament, not only contains nutrient substances, but also has components with antibacterial activity and other bioactivities, can improve the metabolism of cultivated fishes, promote the growth and the development, improve the immunologic function, prevent and treat diseases and the like.

The invention relates to the technical field of coating grinding millers, in particular to an ultra-fine grinding device for powder coating. The ultra-fine grinding device comprises a fixing frame, agrinding cylinder and a storage bin. The lower end of the grinding cylinder is provided with supporting legs, the supporting legs are connected with the bottom of the fixing frame in a welded manner,the storage bin is arranged at the top end of the fixing frame, the left and right ends of the lower surface of the storage bin are connected with feed hoppers, the feed hoppers communicate with the upper surface of the grinding cylinder, a reduction motor is fixed to the lower surface at the top end of the fixing frame, and an output shaft of the reduction motor penetrates through the lower end at the center of the upper surface of the storage bin to be connected with a reciprocating lead screw. According to the ultra-fine grinding device for the powder coating, the reciprocating lead screw is driven by the reduction motor to rotate so as to realize the up-and-down movement of a movable round table grinding block, and the grinding gap is gradually reduced in the grinding process, so thatextremely fine grinding of the powder coating is realized, and the grinding effect of the ultra-fine grinding device for powder coating is excellent.

The invention provides an organic silicon acrylic acid modified waterborne epoxy emulsion and a preparation method thereof. The core layer consists of low-grade bisphenol A epoxy resin, reactive diluent, epoxy silane, a reactive emulsifier, an initiator, an assistant and an acrylic acid monomer; the shell consists of vinyl siliane, an acrylic acid monomer, a reactive emulsifier, an assistant, an initiator and de-ionized water. The obtained organic silicon acrylic acid modified waterborne epoxy emulsion is small and even in particle size and excellent in stability, is excellent in mechanical strength, environment-friendly and energy-saving after being formed to be films. The dry film matched with modified amine curing agent via the modified waterborne epoxy emulsion can reach the level of close to the film property of solvent-type epoxy resin.

A nanometre-class iron oxide powder with different shapes prepared through the reaction between Fe-ion solution and alkaline solution under the condition of introducing surfactant, and features that the shape of the said nanometre iron oxide particles can be controlled by regulating the proportion mix between the high-molecular and the low-molecular surfactants. Its advantages are fine and uniform granularity (10-30 nm), simple equipment and low cost.

The invention disclose a pine pollen and cyclodextrin composition, a method for preparing the same and application of the same in the preparation of health-care products for resisting fatigue and improving immunity of organisms. The composition consists of extract of wall-broken pine pollen and cyclodextrin, and is characterized in that the mass ratio of the pine pollen or the extract of the pine pollen to the cyclodextrin is 1:0.6-5. The preparation method comprises the following steps of: adding pure water and the cyclodextrin into to the wall-broken pine pollen or the extract of the wall-broken pine pollen in an amount which are two times of that of the wall-broken pine pollen or the extract of the wall-broken pine pollen; uniformly stirring the mixture and grinding the mixture for 0.5 to 3 hours; drying the ground mixture under reduced pressure at a temperature below 50 DEG C; and crushing the mixture and passing the crushed mixture through a sieve to obtain the pine pollen and cyclodextrin composition. The application of the pine pollen and cyclodextrin composition in the preparation of the health-care products for resisting the fatigue and improving the immunity of the organisms has the advantages that: the composition is strong in stability; the preparations have good performance; the stability of active ingredients is obviously improved compared with the wall-broken pine pollen on the market; the products are long in storage time and convenient in transport; and the active ingredients of pine pollen can be absorbed by human bodies.

The invention discloses a preparation method of a supported nano photocatalytic composite material, which comprises the following steps: preparing rare-earth-compound-doped titanium dioxide by a sol-gel process, wherein the rare-earth doping amount is 0.10-0.65%; and carrying out high-temperature calcination to support the titanium dioxide on zeolite, wherein the supporting amount of the zeolite is 10-55%. The wastewater treatment experiment detects that the COD chemical oxygen demand) degradation ratio of the supported nano photocatalytic composite material reaches 91% above.

The invention relates to a production method of battery-grade iron phosphate, comprising the following steps of: dissolving polymeric iron sulfate into a solution with the iron ion concentration of 0.03-0.3 M; then adding a phosphate solution to generate an alkali iron phosphate sizing agent; then carrying out solid-liquid separation on the alkali iron phosphate sizing agent; adding separated alkali iron phosphate to a phosphoric acid solution for processing, and regulating a pH value; and then filtering, washing and drying to obtain the battery-grade iron phosphate. The invention reduces theusing amount of alkali in the producing process by utilizing the polymeric iron sulfate as ferric iron ions and the characteristics of lower acidity of the polymeric iron sulfate compared with iron salt, i.e. iron sulfate and the like, has the advantages of simple process flow, low production cost, high product purity, Fe content higher than 29 percent, purity higher than 99 percent and small anduniform grain diameter and is especially suitable for producing lithium iron phosphate, i.e. a positive pole material, of a lithium ion battery.

The invention relates to a method for preparing color fluorescent nanometer resin particle dispersion liquid and aims at providing a preparation method with the advantages that concrete operation of experiments and scale production is convenient, the technical process is easy to control, the process stability is high, and the prepared color fluorescent nanometer resin particle has the effects that the particle size distribution is uniform, the glossiness is good, and meanwhile, better temperature resistance performance, sun-proof performance and acid-base resistance performance are realized. The method has the technical scheme that the method for preparing the color fluorescent nanometer resin particle dispersion liquid comprises the following steps of (1) polymerization medium initiating system preparation, (2) monomer emulsion system preparation and (3) polymerization reaction. According to the method for preparing the color fluorescent nanometer resin particle dispersion liquid, monomers in the step (2) are mixtures of drainable nonpolarity vinyl monomers, vinyl cyano monomers, polar vinyl monomers and sulfonic vinyl monomers, and the consumption of the monomers accounts for 20 to 50 percent of the weight of a monomer emulsion system.

The invention discloses a palladium/carbon nanotube catalyst for the hydrogenation of cinnamaldehyde and a preparation method thereof. The carrier of the catalyst is carbon nanotubes, and the active ingredient of the catalyst is noble metal palladium nanoparticles with an average particle size of 5 to 6 nanometers. The catalyst contains 0.1 to 5 mass percent of palladium and the balance of the carbon nanotubes. The preparation method of the catalyst comprises: 1) dissolving a palladium salt in deionized water to prepare 0.01 to 0.2 mol/L aqueous solution of the palladium salt, adding the carbon nanotubes into the aqueous solution of the palladium salt and subjecting the solution to ultrasonic dispersion for 0.5 to 1 hour; 2) with magnetic stirring, dripping reducer-containing aqueous solution till the ratio of the reducer and the palladium is 1:1 to 2:1, and continuously stirring for 1 to 2 hours after the dripping is finished; and 3) finally, stirring the solution in an oil bath for 1 to 2 hours, and obtaining the palladium/carbon nanotube catalyst by filtering, washing and drying. Compared with active carbon supported palladium catalyst, the palladium/carbon nanotube catalyst has high selectivity for the preparation of benzenepropana by the hydrogenation of cinnamaldehyde.

The invention discloses a doping modification method of spinel lithium manganate anode material, and belongs to the field of nanotechnology. The method mainly comprises the following steps: respectively adding a saline solution of lithium-ion and doping ion into a citric acid solution, regulating pH values, adding ethylene glycol into the solution, heating and stirring the solution so as to form sol, mixing manganous-manganic oxide with the sol, performing ball milling, and performing microwave dehydration and subsequent heat treatment on products subjected to ball milling so as to obtain the doped spinel lithium manganate anode material. The method has the advantages that the prepared spinel lithium manganate anode material has high specific capacity, good rate capability and excellent cycling performance, meanwhile the technology is simple, the cost is low, the efficiency is high, and the method can be directly applied to industrial production.

The invention discloses a preparation method of an InP quantum dot, relates to the field of quantum dot materials, comprising the following steps: firstly, water and oxygen are removed from a reactionvessel, then a homogeneous precursor solution of indium and zinc is prepared, a phosphorus precursor is added, a synthetic shell material is added, and then, an InP quantum dot structure with a shellstructure is prepared by increasing the shell thickness while raising the temperature. The InP crystal nucleus of the InP quantum dot prepared by the invention are nano-structures, and the shell layer composition comprises one or several of ZnS, ZnSe and ZnSeS; the fluorescence emission peaks range from 450 nm to 700 nm, and the half maximum width is less than 55 nm. The invention can effectivelycontrol crystal nucleus growth and fluorescence emission wavelength, and obtain InP quantum dots with small and uniform crystal nucleus diameter, wide luminous color gamut and narrow half-maximum width. At the same time, it can reduce the surface oxidation of the crystal nucleus, promote the thickness of the shell layer with high quality and low defects, and improve the luminescence efficiency ofInP quantum dot.