84results about How to "Control dispersion" patented technology

The invention relates to a water-based primer-topcoat braking paint and a preparation method thereof. The braking paint comprises the following materials by weight percentage: 30-40 of water-based acrylic resin, 2-10 of amino resin, 1-3 of neutralizing agent, 2-5 of compound rustproofing pigment, 1-3 of tinting pigment, 10-20 of filling agent, 0.1-0.5 of defoaming agent, 0.1-0.5 of flatting agent and 25-40 of deionized water, wherein the water-based acrylic resin is a free radical polymerization resultant which comprises the following materials by weight percentage: 10-30 of monomer containing hydroxy acrylic acid, 5-20 of monomer containing carboxyl acrylic acid, 2-8 of internal crosslinking monomer, 20-40 of other acrylic acid monomer, 15-30 of phenyl ethylene monomer, 1-5 of evocating agent and 40-50 of alcohol ether latent solvent. When the paint is prepared, the dispersion and the abrading condition of the pigments and the filling agents are reasonably controlled to ensure that each component of the paint fully plays the respective function. The paint ensures the corrosion prevention effect and the decoration of a coating and realizes the combination of a primer and a topcoat.

The invention belongs to the technical field of lithium-ion battery, and in particular relates to a method for supplementing lithium powder to a lithium-ion battery negative plate. The method comprises the following steps: a first step, putting the cold-pressed negative plate on an unwinding and rewinding mechanism, and putting lithium powder to a feeding mechanism above the negative plate; a second step, adding electric fields and opening the feeding mechanism, so that the lithium powder is adsorbed on the surface of the negative plate under the action of the electric fields; and a third step, rolling the negative plate adsorbed with the lithium powder. Compared with the prior art, the method can control the movement of the lithium powder to overcome the flotation of metal lithium powder in air through electrostatic effect provided by the electric fields, and can simultaneously control the addition of the lithium powder and the dispersion degree of the lithium powder on the negative plate, thereby uniformly, quantitatively and precisely dispersing the lithium powder on the surface of the negative plate. Besides, the whole process provided in the invention is only needed to be carried out in a drying environment without adding the lithium powder in a process of preparing slurry, has a simple manufacture process and low cost, and is suitable for large-scale production.

The invention belongs to the technical field of environmental catalytic materials and specifically relates to a preparation method of a silver-carrying titanium dioxide anti-bacterial agent. The anti-bacterial agent comprises titanium dioxide microspheres as carriers with a high length-diameter ratio and silver particles distributed on surfaces or interiors of the titanium dioxide microspheres. The preparation method comprises a titanium dioxide microsphere preparation method and a silver particle carrying method, wherein the silver particle carrying method adopts the following three methods of a complex reaction and photo-reduction combined method, a direct photo-reduction method and an excessive immersion method. The operation of the present preparation method is simple. Titanium dioxide carriers prepared by the present preparation method has a high length-diameter ratio, a high crystallinity and thus can reduce effectively recombination of electrons and holes and enhance titanium dioxide photocatalytical and anti-bacterial effects, and the silver particle carrying method can effectively control a dispersibility of silver and make silver be distributed on surfaces or interiors of titanium dioxide microspheres to realize a slow release of silver, avoid color change, and enhance anti-bacterial effects simultaneously.

The invention relates to nitrogen-doped porous carbon nanosheet-supported non-noble metal catalyst and a preparation method thereof. The catalyst is made by embedding metal and metal oxide nanoparticles into nitrogen-doped porous carbon nanosheets or supporting them to the surfaces of the nitrogen-doped porous carbon nanosheets; the preparation method comprises: 1), synthesizing a polymerizable ionic liquid monomer; 2), reacting the obtained ionic liquid with a metal salt precursor, and drying to obtain an intermediate product, solid powder; 3), placing the obtained solid powder in a magnetic boat, placing in a tubular furnace fitted with a quartz tube, charging an inertial gas at a certain flow rate, heating to 600-1000 DEG, holding the temperature for 0.5-5 h, and naturally cooling to room temperature to obtain the catalyst. The poly-ionic liquid is used as the precursor, metal supporting capacity is high, the cost is low, oxygen reduction and oxygen evolution catalytic activity is high, the prepared product has stable performance, and the preparation method is simple and is easy to scale up and industrially apply.

The invention discloses a preparation method for a metal organic framework-derived tricobalt tetroxide-modified titanium dioxide nanotube array. The method comprises the following steps: firstly performing pretreatment on a titanium sheet substrate material; performing electrochemical treatment on the treated titanium substrate material by using an ethylene glycol solution containing ammonium fluoride and water as an electrolyte, and performing calcination by using a muffle furnace to change a titanium dioxide crystal form; secondly, performing cobalt hydroxide electrodeposition by means of athree-electrode electrochemical workstation and by using cobalt nitrate hexahydrate as an electrolyte, a titanium dioxide nanotube array as a working electrode, a platinum sheet as a negative electrode and silver / silver chloride as a reference electrode; performing hydrothermal treatment on the titanium dioxide nanotube array to form ZIF-67 in situ; and finally, performing secondary calcination byusing a muffle furnace to obtain the ZIF-67-derived porous tricobalt tetroxide-modified titanium dioxide nanotube array. The method disclosed by the invention can effectively improve absorption capacity of TiO2 on visible light, promote separation of electron hole pairs, and improve photocatalytic degradation efficiency of organic pollutants.

The invention relates to an inner support hollow fibrous membrane which adopts a hollow braided rope as an inner supporting material. A base body polymer, a metal organic framework material and a pore forming agent are mixed together to be dissolved with a solvent, a membrane casting solution is obtained, the membrane casting solution coats the hollow braided rope, and solidification forming is performed to obtain the inner support hollow fibrous membrane. The metal organic framework material is adopted for improving the porosity and water flux of the inner support membrane; the proper proportion of the metal organic framework material to the pore forming agent in the membrane casting solution, organic coordination and synergism of the components are utilized, the interface wettability of the membrane casting solution and a coagulating bath can be effectively controlled, a coagulator and solvents in the membrane casting solution are easily dispersed and penetrate into the interface, effective combination of the membrane casting solution formula and the pore forming conditions is utilized, and the inner support hollow fibrous membrane of different pore diameters and different rejection performances can be spun; the obtained inner support hollow fibrous membrane can be used for an MBR and an immersed ultrafiltration assembly, the probability of broken yarn and sewage plugging is lowered, and the service life of the membrane is prolonged.

The invention belongs to an on-line aggregate monitoring device. The on-line aggregate monitoring device comprises a sampling module, a sample injection module, a dispersion module and an image acquisition and analysis module, wherein the sampling module is arranged on a feeding conveyor belt, performs sampling at a preset frequency and feeds samples to the sample injection module; the samples reach an image acquisition area of the image acquisition and analysis module through the dispersion module; and the image acquisition and analysis performs feature extraction on acquired images to obtainparameters of aggregate. The machine vision and digital image processing combined technology is adopted to realize rapid on-line detection of the granularity and the grain shape of aggregate, the aggregate grading situation of an aggregate production line can be reflected in time, and economic loss caused by unqualified granularity and quality of fine aggregate is avoided.

The invention discloses a preparation method of nanometer magnesia. The method comprises the following steps: (1) dissolving soluble magnesium salt into a polyhydric alcohol solution, and continuously stirring to form a transparent solution; (2) adding a precipitant to the transparent solution according to the mass ratio of the soluble magnesium salt to the precipitant being (1:2) to (1:8), stirring and completely dissolving the precipitant to obtain a mixed solution; (3) refluxing and heating the mixed solution, controlling the reaction temperature at 100-140 DEG C, and controlling the reaction time for 4-12 hours; (4) ending the reaction, cooling, standing and ageing for 0-10 hours; and (5) diluting the solution obtained from the step (4), filtering, washing a filter cake, drying and calcining to obtain the nanometer magnesia. The nanometer magnesia prepared by the method is good in dispersibility, and high in purity; the performance of a magnesia material is improved; and application and popularization of the nanometer magnesia material towards sophisticated industries are facilitated.

The invention relates to a ternary positive electrode material of a high-capacity lithium ion battery and a preparation method thereof. The ternary positive electrode material contains lithium, manganese, cobalt, nickel and other elements. The preparation method comprises the steps of preparing mixed salt solution of manganese salt, cobalt salt and nickel salt and adding polymer organic matters into the mixed salt solution, adding a precipitate complexing agent and a lithium compound into the solution to prepare a precursor sizing agent, stirring the sizing agent uniformly, preparing precursor particles through a spraying drying method, and roasting in air to obtain the high-capacity positive electrode material, namely LixNiyCozMn(1-y-z)O2, wherein x is more than or equal to 1.2 and less than 1.5, y is more than 0 and less than or equal to 0.5, z is more than 0 and less than or equal to 0.5, and y plus Z is less than 1. The LixNiyCozMn(1-y-z)O2 ternary positive electrode material has high capacity, stable electrochemical performance and simple technique process, is easy to operate, is environmentally friendly, and is suitable for large-scale industrial production and application.

The invention discloses a narrow-bandwidth Brillouin optical timedomain reflectometer (OTDR) based on a sensing optical fiber of a three-layer structure. The OTDR comprises a light pulse generating unit (200), wherein light pulses generated by the light pulse generating unit (200) enter into a first port of a circulator (207) after passing through a polarization scrambler (206), and enter into the sensing optical fiber (208) through a second port of the circulator; and backward scattered light of pulsed light in the sensing optical fiber (208) enter into a filter unit (209) through a third port of the circulator; light output by the filter unit and light output by a local oscillation light unit (210) are coupled into a detection and signal processing unit (217) through a coupler (216); and a pulse generator is used for driving a modulator to generate pulse and clock control. The sensing optical fiber in the OTDR can not only increase Brillouin threshold, but also reduce Brillouin frequency shift and bandwidth of a detector; and as a Brillouin ring-shaped cavity laser is designed to serve as local oscillation light concerned with detection, the bandwidth of the detector is greatly reduced, and the measuring accuracy of the Brillouin OTDR is improved.

The invention provides a preparation method for a PtCu / C catalyst, and belongs to the field of preparation methods for noble metal catalysts. The method comprises the following steps of mixing a copper source and a carbon support in a solution to obtain a suspension; mixing the suspension and sodium borohydride, and adding a citric acid solution to obtain a mixed solution; and mixing the obtained mixed solution and a platinum source to obtain the PtCu / C catalyst. According to the method, the citric acid solution is added in the reaction process to prevent the aggregation of nanoparticles, and the concentration of nitric acid is controlled to control the degree of wrapping of the citric acid on the surfaces of the nanoparticles, so that the degree of dispersion of the PtCu nanoparticles is controlled, and the methanol electro-oxidation catalysis performance is improved; the PtCu nanoparticles are uniformly dispersed, and are free of the aggregation, and the cyclic voltammetry curve of the PtCu / C catalyst in a methanol solution shows that the peak current density reaches 1,211mAmg<-1>.

The invention relates to a preparation method of a nanometer Fe3O4 which adopts a self-propagating combustion reaction method of a citric acid-nitrate sol gel including the following steps: a. the analytically pure Fe(NO3)3 9H2O and the analytically pure C6H8O7 H2O are dissolved into deionized water; b. the mixed water solution configured is placed into a water bath box for stirring by a supersonic wave and then is evaporated in the water bath until the solution turns into a transparent iron citric acid complex gel; c. the obtained wet gel is placed into a baking oven for a further drying to remove the moisture. The gel without moisture is heated by the resistance furnace until the gel becomes a natural state; d. after a self-propagating combustion, the precursor fluffy substance of the obtained Fe3O4 is ground for obtaining a power body which is sintered in an inert gas atmosphere furnace. At last, the temperature is naturally reduced to the room temperature; therefore to obtain nanometer Fe3O4 power body. The preparation method prepares Fe3O4 power body with high purity and non-pollution, which achieves the purpose of green synthesis.

The invention belongs to the technical field of advanced nanocomposites, and particularly discloses a high-dispersity hollow anti-bell ringing type copper / silicon dioxide core-shell nanoparticle and a preparation method thereof. The preparation method comprises the following steps: synthesizing a copper nanoparticle with uniform morphology and size by adopting a high-temperature decomposition method; coating a layer of uniform silicon dioxide on the surface of the nanoparticle by using a cyclohexane / ammonia water reversed-phase micro-emulsion method so as to form a copper / silicon dioxide core-shell structure; and finally carrying out processing under an alkaline condition by utilizing a hydrothermal method so as to obtain the high-dispersity hollow anti-bell ringing type copper / silicon dioxide core-shell nanoparticle. The hollow anti-bell ringing type nanoparticle has the advantages of being high in copper metal dispersity, uniform in morphology and high in specific surface area, and has important application prospect in the fields of adsorptive separation and catalysis. According to a synthesis method provided by the invention, the control carried out on the specific surface area and copper dispersity of the hollow anti-bell ringing type core-shell nanoparticle can be realized. The synthesis raw materials are easy to get and the method is simple and rapid, so that large-batch synthesis can be realized.

The invention relates to a treating agent for a zwitter-ion inorganic-organic monomer polymer drilling fluid and a preparation method of the treating agent, and belongs to the technical field of synthesis and preparation of a water-soluble polymer material. The preparation method comprises the following steps: adopting carboxylic acid monomers A, sulfonic acid monomers B, nonionic monomers C, cationic monomers D and inorganic material monomers E as raw materials; feeding the raw materials, wherein the ratio of the amounts of substances of the carboxylic acid monomers A to the sulfonic acid monomers B to the nonionic monomers C to the cationic monomers D is (5-40):(25-10):(65-35):(5-15), and the dosage of inorganic material monomers E is 5%-25% of the total mass of the carboxylic acid monomers A, the sulfonic acid monomers B, the nonionic monomers C, the cationic monomers D and the inorganic material monomers E; adopting water as a solvent, and initiating polymerization through an oxidation-reduction initiation system to obtain the treating agent. The treating agent has higher anti-collapse ability, can effectively control hydration and dispersion of clay shale and mud making of clay, has a better hydrocarbon reservoir protection effect, and is high in permeability recovering value, simple in production technology, extensive in raw material sources and wide in popularization prospects.

This invention discloses a method for preparing uniform nanoscale Fe3O4. The method comprises: adjusting the pH value of ferrous salt solution to 9-11 with NaOH, adding trace amount of complexone, and oxidizing in air under the induction of visible light to obtain spherical Fe3O4 nanopowder. The particle sizes of the Fe3O4 nanopowder are 10-50 nm, and can be artificially controlled. The Fe3O4 nanopowder has such advantages as uniform particle size distribution, good dispersibility, high purity and high yield. The method is simple and economic.

The invention relates to a gel material for efficient treatment of tumors and a preparation method thereof. The gel material is composed of a micro organic-inorganic hybrid nano-gel carrier and a bio-enzyme component loaded on the micro organic-inorganic hybrid nano-gel carrier. The micro organic-inorganic hybrid nano-gel carrier comprises an inorganic nanoparticle core and an organic gel layer compounded on the surface of the inorganic nanoparticle core, wherein the organic gel layer is formed by deposition and self-assembly of a gelling factor on the surface of the inorganic nanoparticle core, and the gelling factor is Fmoc- or Nap- functionalized small molecular polypeptide with an aromatic substituent group. Compared with the prior art, the micro organic-inorganic hybrid nano-gel carrier adopted by the invention provides natural protection for loading and immobilization of bio-enzyme, glucose responsive and reactive oxygen species responsive efficient and tandem enzyme-catalyzed reaction is carried out at a tumor site, tumor lesion site or other lesion sites to generate singlet oxygen, thus realizing efficient and safe treatment.

The invention discloses a method for preparing a green tire by combining graft-modified carbon black and TPI (trans-1,4-polyisoprener) and improving properties of natural rubber (or synthetic rubber). The preparation method comprises the following steps: adding the natural rubber ( or synthetic rubber), TPI, graft-modified carbon black and other small materials into an open mill or Banbury mixer, compounding uniformly, and vulcanizing the compounded rubber by pressurization and heating to obtain the product. The method is characterized by integrating low rolling resistance and low dynamic heat generation of the graft-modified carbon black in rubber with high wear resistance and high flexing resistance of the TPI in rubber. The rubber composite material prepared by the method can obtain favorable comprehensive properties. The tensile strength of the vulcanized rubber is greater than 27.0 MPa; the 300% stress at definite elongation is greater than 9.8 MPa; the tearing strength is greater than 65.3 kN / m; the elongation at break is greater than 609%; and the Grade 2 and Grade 6 flexing resistance respectively reach 53 thousand and 127 thousand times.

The invention belongs to the field of compound preparation, and discloses a silver-loaded nanometer titanium dioxide sol, a preparation method and applications thereof. The preparation method comprises: (1) carrying out mixing hydrolysis on an alkoxy titanium compound, hydrogen peroxide, a complexing agent and water, uniformly mixing the obtained titanium dioxide precursor solution and a nucleating agent, and carrying out hydrothermal treatment to obtain a titanium dioxide water dispersion liquid; (2) cooling the titanium dioxide water dispersion liquid to a room temperature, washing with water to achieve neutrality, and concentrating to obtain a concentrated titanium oxide sol; and (3) uniformly mixing the concentrated titanium oxide sol and a silver nitrate aqueous solution, and irradiating the obtained titanium-silver mixed solution with ultraviolet light. According to the present invention, with the method, the silver-loaded nanometer titanium dioxide sol with characteristics of small particle size, large specific surface area, good stability and high titanium dioxide concentration can be obtained, and the dispersibility of silver can be effectively controlled, such that silver is uniformly dispersed on the surface of the carrier titanium dioxide so as to enhance the antibacterial effect.

The invention relates to a spherical styrene-butadiene rubber material for 3D printing. The material is characterized in that a structural core is polystyrene microspheres; the material is prepared from, by weight, 5-20 parts of polystyrene microspheres, 60-80 parts of butadiene monomers, 20-30 parts of styrene monomers, 0.2-1 part of an emulsifying agent, 0.02-0.5 part of an initiator, 0.02-0.1 part of a terminating agent and 80-120 parts of a filling material. Styrene-butadiene rubber latex is prepared through a seeding emulsion polymerization method in which the polystyrene microspheres serve as the core and the polystyrene microspheres, the butadiene monomers and the styrene monomers are grafted and copolymerized, the styrene-butadiene rubber latex and the filling materials are coagulated into powder, the particle size is 10-100 micrometers, particle size distribution is narrow, performance is uniform and stable, and the spherical styrene-butadiene rubber material can be directly applied as a 3D printing material.

The invention discloses a stirring device which comprises a stirring cylinder, an inner stirring shaft, an outer stirring shaft, a rotation driving mechanism and a linear driving mechanism, wherein stirring blades are arranged at the lower end of the outer stirring shaft; the outer stirring shaft is connected with the linear driving mechanism; the linear driving mechanism drives the outer stirringshaft to move up and down; a circumferential fixing mechanism is arranged between the outer stirring shaft and the inner stirring shaft; the rotation driving mechanism drives the inner stirring shaftto rotate; and at the same time, the inner stirring shaft drives the stirring blades of the outer stirring shaft to rotate and agitate through the circumferential fixing mechanism. The stirring blades of the device can move up and down during rotation; an agitation amplitude is large; the inner circulating of materials is facilitated; material layering under a laminar condition is avoided; the device is large in heat exchange area and high in heat exchange efficiency; the stirring cylinder is internally provided with a heating device and temperature induction devices, so that a temperature during material stirring can be controlled; a controller controls a heating temperature of the heating device, a rotating rate of the rotation driving mechanism and a moving rate of the linear driving mechanism; and therefore, a stirring status of the stirring materials can be controlled precisely.

The invention relates to a clay stabilizer and a preparation method thereof. Epichlorohydrin, dimethylamine, allyltrimethylammonium chloride and gamma-(methacryloyloxy)propyltrimethoxysilane undergo a reaction under action of an initiator and a hydrolysis inhibitor for hydrolysis inhibition to produce the clay stabilizer. The clay stabilizer is injected into a stratum and then undergoes a hydrolysis reaction to produce a silicon hydroxyl group for a condensation reaction with stratum clay so that clay hydration expansion and dispersion transfer are controlled, anti-swelling effects are good and molecular weight is low. The clay stabilizer is suitable for a low permeability reservoir.

The invention provides a novel method of preparing nano zirconium oxide powder for dentistry.The novel method includes: selecting soluble zirconium oxide as a raw material, soluble yttrium salt as a stabilizer and ammonia water as a precipitator, and adopting a quick co-precipitation method to generate a zirconium oxide precursor under vigorous stirring; immediately using a lot of deionized water for dilution without aging, suction-filtering, washing, dehydrating, drying, and calcining to obtain zirconium oxide powder.Crystal shape of nano zirconium oxide is square-phase zirconium oxide particles, average particle size of primary particles is 2-3 nm, and particle size is 10 nm and 25 nm after the particles are treated at 800 DEG C for 2 h.The method is simple and convenient in preparation process, low in cost, short in period, high in repeatability and suitable for batch production, and the powder is uniform in granularity and is nanoscale.

The invention discloses graphene / organic-matter composite particles and a preparation method thereof. The graphene / organic-matter composite particles are prepared from organic-matter particles 1, a graphene powder layer 2 and a shell protective layer 3, wherein the graphene powder layer 2 is coated on the surfaces of the organic-matter particles 1, and is wrapped by the shell protective layer 3. The graphene / organic-matter composite particles are prepared by the following process steps of: pretreating the organic-matter particles, compounding organic-matter particles / graphene powder, sieving and spraying for coating and the like. The preparation method is simple in process, convenient in implementation and low in production cost. The size of the prepared graphene / organic-matter composite particles and the thickness of the graphene powder layer are controllable, and the graphene / organic-matter composite particles can be used as micropowder for jet-printing and forming raw materials andcan be used for producing graphene-modified composite materials or devices.

The invention provides a method for preparing CuCrO2 powder. The method comprises the following steps: (1) preparing a water solution with equal mole number and the total mass concentration of 5-20%; (2) adding a composite combustion agent water solution into the solution obtained in (1), wherein the composite combustion agent water solution is a glycine and citric acid mixture; (3) adding an inorganic salt solution into the solution obtained in (2); (4) adding ammonium hydroxide to regulate the pH value of the solution obtained in (3) to be 2.5-5.5; (5) heating up the solution obtained in (4) for combustion, and after finish of combustion, collecting grey powder; and (6) grinding and roasting to obtain CuCrO2 powder. The obtained CuCrO2 powder is small in granularity, uniform in dispersion, high in purity and good in crystalline perfection, and represents favorable water-splitting activity for hydrogen production after being compounded with WO3.

The invention discloses palladium-silver slurry for a chip varistor. The palladium-silver slurry contains metal powder, wherein the metal power is palladium-silver powder; in the palladium-silver slurry, the mass percentage of the palladium-silver powder is 45 to 65 percent. The palladium-silver slurry is used in the chip varistor, and has the advantages of environment protection, good dispersionperformance, high stability, high reliability, good printing performance and the like; the obtained chip varistor has good performance. Compared with imported palladium-silver slurry, the palladium-silver slurry has the advantages that the green and environmental-friendly effects are achieved; the stability is good; the cost is low; relatively good application prospects are realized.

The invention discloses battery paste and a lithium ion secondary battery made of the battery paste. The battery paste comprises positive electrode paste and negative electrode paste. The fineness of the positive electrode paste is smaller than 20 microns, and the viscosity range of the positive electrode paste is 6500 mPa.s-7500 mPa.s. The fineness of the negative electrode paste is smaller than 5 microns, and the viscosity range of the negative electrode paste is 3800 mPa.s-4200 mPa.s. The positive electrode paste includes positive electrode electro-active substances, conductive agents, adhesion agents and solvents. The negative electrode paste includes negative electrode electro-active substances, conductive agents, adhesion agents and solvents. The invention further provides the lithium ion secondary battery made of the battery paste. The battery paste is good in dispersity, the lithium ion secondary battery made of the battery paste is excellent in high-rate cycling performance, and long-time high-rate charging of a lithium ion battery with lithium titanate as a negative electrode is achieved, and long-time high-rate cycling charging and discharging stability is high.

The invention discloses an arsenic-removing adsorbent with IB group metal nanoparticles loaded on a zinc zirconium composite oxide and a preparation method thereof. The method comprises the followingsteps: firstly, preparing an IB group metal salt solution, a zinc salt solution and a zirconium salt solution into a mixed metal salt solution; with the deionized water with pre-regulated pH value asa base solution, adding the mixed metal salt solution and a precipitant solution for co-precipitating and controlling an end point pH value within a range of 7-10; ending the dropwise adding, continuously stirring, heating and hydrolyzing the precipitate; centrifugally separating, thereby acquiring a hydrolysis product; washing, centrifuging, drying and baking, thus obtaining the arsenic-removingadsorbent. The arsenic-removing adsorbent prepared according to the invention is high in specific surface area and narrow in pore size distribution; the metal nanoparticles are highly dispersed and loaded onto an amorphous composite oxide carrier, so that the arsenic-removing adsorbent has the characteristics of high removal rate, high adsorption capacity, less dosage, high adsorption rate, and the like; the arsenic-removing adsorbent can be used for deeply treating the low-concentration arsenic pollutants in underground water and surface water and the low-concentration arsenic-bearing industrial wastewater.

The invention provides a manufacture process for optimizing electromagnetic composite absorption materials. Soft magnetic ferrite particles and soft magnetic metals are made into micrometer level mixtures to be used as electromagnetic interference absorption particles, the electromagnetic interference absorption particles are mixed with organic covering agents, the mixtures are dried and dispersed, absorption agent particles after the insulation covering treatment are obtained, bonding agents are added into the absorption agent particles subjected to the insulation covering treatment, in addition, the materials are uniformly mixed, the composite electromagnetic shielding absorption raw materials are obtained, the composite electromagnetic shielding absorption raw materials are made into various electromagnetic composite absorption material products in various modes including thickness film screen printing or rolling process preparation, extrusion process, compression and forming process and the like according to requirements. The manufacture process provided by the invention has the advantages that the bonding performance between the electromagnetic interference absorption agents and the bonding agents can be improved, the dispersion degree and the space of the electromagnetic interference absorption agent particles in the whole system are controlled, and the communication unsmoothness caused by impedance change when metal anti-metal electronic labels are attached onto metal type back plates can be avoided.

The invention discloses a method for preparing silver powder by a space confinement method, which is characterized by using a spiral reactor, adding double reducing agents, stirring is not needed, andthe silver powder is prepared by an ultrasonic parallel flow mode. and filtering, washing, emulsifying, drying and crushing the obtained silver slurry to obtain the silver powder. The temperature ofthe reduction reaction does not need to be controlled in the whole reaction process, and a new thought is provided for silver powder preparation. The silver powder prepared through the method has extremely high dispersity, single-particle dispersion of the silver powder can be achieved, the tap density is larger than 6.0g / cm<3>, the apparent density is larger than 3.3g / cm<3>, and wide market popularization prospects are achieved. The dispersity of the silver powder can be improved by replacing stirring with ultrasonic waves, the soft agglomerated silver powder is dispersed in the reaction process, the wall sticking phenomenon of the silver powder in a reaction kettle can be reduced through the spiral reactor, and in the use process, the reactor is convenient to clean and is not prone to blockage.

The invention provides an oxidation catalyst for purifying the exhaust gas of a diesel engine and a preparation method thereof, belonging to the technical field of treatment of automobile exhaust. The catalyst is composed of iolite cellular ceramic or metal used as a carrier and an active coating containing active alumina, composite oxide, a molecular sieve and a precious metal. The preparation method comprises the following steps: subjecting pseudo-boehmite, alumina and composite oxide to mixing in deionized water under stirring and then carrying out ball milling; adding solutions of the molecular sieve and the precious metal so as to prepare a liquid coating material; and coating the carrier with the liquid coating material and carrying out drying and roasting. The diesel oil oxidation catalyst provided by the invention has good purifying effect on CO, HC and SOF; and the catalyst has good low-temperature oxidation performance through addition of composite oxide containing Mn and reduction in the oxidation temperature of NO.