727results about How to "Improve dispersion" patented technology

The invention discloses a method for preparing a silicon carbide alloy negative electrode material for a lithium ion battery; and a technical problem to be solved is to increase the circulation performance and the specific capacity of a silicon carbide composite negative electrode material. The method comprises the following steps of: dispersing nanometer silica powder in an organic solution to form a uniform nanometer silicon suspending liquid, then adding a silane coupling agent to the nanometer silicon suspending liquid, and finally carrying out carbon coating and thermal treatment. Compared with the prior art, the method has the advantages of increasing the dispersiveness of nanometer silicon particles in a silicon carbide composite material and inhibiting the volume effect caused by the conglobation of silicon in a lithium intercalation and deintercalation process by adding the silane coupling agent, thereby increasing the circulation performance and the specific capacity of the silicon carbide composite negative electrode material, wherein the capacity of the silicon carbide composite negative electrode material is larger than 500mAh/g, and the capacity retention rate is above 97% when the silicon carbide composite negative electrode material is circulated for 50 times; and according to the preparing method, the preparation cost is low, the technology is simple and controllable, and the silicon carbide alloy negative electrode materials with different capacities can be easily prepared by adjusting a weight proportion of Si powder, graphite and an organic matter.

The present invention provides a process for simply and easily producing fine metal particles or fine metal oxide particles in the form of a dry powder which can be used as extremely fine particles in a good dispersion state without causing coagulation for a long time even if not stored in a dispersion solvent. Fine metal particles or fine metal oxide particles in the form of a dry powder are prepared using a dispersion in which fine metal particles or fine oxide metal particles having a surface oxidation film are dispersed in an organic solvent in a stable state, while once covering the particle surface with covering agent molecules containing, at a terminal, a functional group having an oxygen atom, a nitrogen atom, or a sulfur atom as a group capable of forming a coordinative bond with metal, and by removing the dispersion solvent, washing and removing excess covering agent molecules with a polar solvent without damaging the covering agent molecule layer covering the fine particle surface, finally evaporating the polar solvent used for washing and drying.

The invention discloses a preparation method of a viscosity-reduction type polycarboxylate water reducer, which belongs to the field of concrete admixtures. The water reducer is prepared from random polyoxyalkyl ether unsaturated acid ester, unsaturated modified polyoxyethylene ether, unsaturated acid alkyl ester, and (methyl) acrylic acid, by means of copolymerization with an aqueous solution and then adding alkali for neutralization, under the presence of an initiator and a molecular weight regulator. By a certain quantity of hydrophobic units and hydrophobic groups which are introduced into and controlled in carboxylic acid copolymer molecule structures, the viscosity of a cement-based material is reduced under the presence of the water reducer. The water reducer prepared by the method has the advantages of high viscosity reducing effect, high dispersibility, good adaptability to cement, and the like; the water reducer is especially applicable to preparation of high-strength concrete, self-compacting concrete, low-water-binder-ratio high-dosage mineral admixture concrete, and the like.

The invention discloses a preparation method of nanometer modified corona-tolerant enamel of enameled wire which comprises the steps of, taking 1-20 parts of inorganic oxide nano particles, charging 3-100 organic solvent, dispersing the inorganic oxide into uniform nano dispersed state at room temperature, charging 0.1-1.0 part of modifier for reacting 1-3 hours at 50-140 deg. C, obtaining modified nano material slurry, charging 60-100 parts of insulating resin into modified nano material slurry for reacting 3-6 hours at 70-120 deg. C.

The invention provides a hydrogenation catalyst and a preparation method thereof. The preparation method uses metal active components of group VIB and VIII for step load, wherein metal of group VIB is molybdenum, metal of group VIII is cobalt or nickel, and a carrier is porous oxide. Load of group VIB metal uses a corresponding soluble salt as a raw material, inorganic acid is used as an acidifying agent, and a long-chain alkyl quaternary ammonium cation is used as a precipitating agent; and Mo-based single-component loaded catalyst is prepared by firstly synthesizing an organic-inorganic hybrid material suspension, performing aqueous phase diffusion and tunnel deposition, filtering, washing, drying, and roasting. Load of group VIII metal uses a corresponding soluble salt as a raw material, and the metal is loaded onto the carried through a normal-temperature isopyknic dipping technology. The method can effectively improve load capacity of the active components and dispersiveness of the active components in the tunnels; and the prepared hydrotreating catalysts is excellent in hydrodesulfurization activity.

A nanoparticle thin film, a method for dispersing nanoparticles and a method for producing nanoparticle thin film using the same. The method for dispersing nanoparticles may include modifying the surface of nanoparticles with a charged material, drying the surface-modified nanoparticles under vacuum and/or dispersing the dried nanoparticles in a solvent. According to the methods provided, the nanoparticle thin film may exhibit more stability, lesser defects and/or lesser aggregation of nanoparticles. In addition, 2-dimensional and/or 3-dimensional nanoparticle thin films may be produced in which nanoparticles may be more uniformly applied over larger areas. The nanoparticle thin films produced by the methods may be more effectively used for a variety of applications (e.g., flash memory devices, DRAMs, hard disks, luminescent devices, organic light-emitting diodes (OLEDs) or the like).

The invention relates to a spectrum light splitting imaging system light path based on volume hologram grating component light splitting. Volume hologram grating is adopted as a light splitting component by the spectrum light splitting imaging system light path. Parallel lights which pass through a front imaging lens, a slit and a collimating lens are conducted with diffraction light splitting, after the being split, the lights coalescent, form an image on an image plane through the imaging lens and received by a charge coupled device (CCD) detector. The whole system is small in size and compact in structure, the lights can pass in and out straightly, the utilization rate of light energy is high, and the light splitting performance is good.

The invention discloses a CeO2-ZrO2 based SCR (selective catalytic reduction) catalyst used for denitration and a preparation thereof and belongs to the field of nitric oxide post-processing purification. The catalyst has a three-layer structure, wherein cordierite honeycomb ceramic is used as a carrier; an active coating is loaded on the carrier; a modifying coating is loaded on the active coating; the cordierite carrier has a skeleton carrying function; the active coating of the catalyst mainly has a function of activating NOx and NH3; and the modifying coating mainly has functions of storing NH3, avoiding deep oxidation of NH3 on the surface of the catalyst when the catalyst is used at a high temperature and increasing the sulfur poisoning resistance of the catalyst. The preparation process of the catalyst is simple and can be easily industrialized. A working temperature window of the optimized catalyst can reach 250-450 DEG C, and denitration efficiency is above 80%. The catalyst has the significant advantage of being nontoxic and has excellent heat stability and excellent SO2 poisoning resisting property.

The invention provides a surface-modified graphene, comprising a graphene powder and at least one surface-modified layer, wherein the least one surface-modified layer comprises a surface modification agent and at least two functional groups disposed at two ends of the surface modification agent respectively; one functional group of the at least two functional groups can generate a chemical bond with an organic functional group on the surface of the surface-modified graphene powder; and the other functional group of the at least two functional groups forms a surface characteristic of the surface-modified graphene, wherein the surface modification agent comprises at least one of a coupling agent, aliphatic acid and a resin. Therefore, the surface-modified graphene powder can increase the dispersibility of the graphene powder in a solvent, enhance the endophilicity between the graphene powder and an organic polymer, and make the composite material to be more durable and to have wider applications.

The invention discloses an activation method of a catalyst which includes VIB group metal component and VIII group metal component. The metal components exist as the form of oxidation state. The catalyst contacts with alkaline matter containing solution and organic additive solution. At last, activated catalysts is obtained by thermal treatment. Compared with the existing technologies, the method provided by the invention can effectively enhance activity of catalyst.

The invention discloses a preparation method of nano-grade calcium carbonate. The invention belongs to the technical field of compound preparation. The method comprises steps that: S1, lime is digested; S2, a slurry obtained through digestion is sieved, and is then aged; S3, the aged slurry is carbonized; S4, the carbonized slurry is processed through primary cladding; S5, the slurry processed through primary cladding is subject to press-filtrating, drying, crushing, grading, and packaging, such that an intermediate product is obtained; S6, the intermediate product is subject to secondary cladding, such that a nano-grade calcium carbonate finished product is obtained. When the nano-grade calcium carbonate prepared with the method is used in RTV silicon rubber, the nano-grade calcium carbonate has both high dispersity and high reinforcing property.

The invention discloses plant composite engine oil containing graphene, which includes the following raw materials: castor oil, liquid graphene, modified castor oil, an antioxidant, an anti-corrosion agent, an anti-foam agent, an extreme pressure anti-wear agent, a pour point depressant, an anti-rust agent, a viscosity index improver, a dispersing agent, a cleaning agent, a lubrication modifier, an organic anti-aging agent, and modified nano cerium vanadate. By adding the liquid graphene to the plant composite engine oil, lubricating property of the engine oil is improved, wherein the mechanism of lubrication of the graphene is not same as that of an additive in the prior art. Because the molecular particle size of the graphene is very small, the graphene can generate a roll-ball effect during friction between a cylinder wall and a piston, thereby turning sliding friction into rolling friction, and also can flattening the uneven parts on the cylinder wall just like putty. The graphene, as an anti-wear agent, can promote low-viscosity engine oil better, and enables automobiles to be more energy-saving and environment-friendly.

A process for preparing amino phenylmether from nitro phenylmether mixture by catalytic hydrogenating includes such steps as catalytic hydroreducing reaction between methanol, nitro phenylmether mixture and catalyst, recovering catalyst, decoloring, removing impurities, filtering to obtain liquid phase (the solution of amino phenylmether, methanol and water), separation and refining.

The invention relates to a modified attapulgite heavy metal ion adsorbing agent. The modified attapulgite heavy metal ion adsorbing agent is prepared from the following raw materials in parts by weight: 1 to 2 parts of ammonium sulfate, 2 to 3 parts of water glass, 2 to 3 parts of malonic acid, 6 to 9 parts of layering expanded vermiculite, 0.2 to 0.4 part of citronellol, 1 to 2 parts of a silane coupling agent with amino group, 1 to 2 parts of sodium carboxymethylcellulose, 100 to 120 parts of attapulgite, an appropriate amount of water, 5 to 10 parts of assistants and 20 to 30 parts of a 2% to 3% sodium hydroxide solution. The dispersibility, suspension property, adsorption property and thickening performance of the attapulgite are improved, and the attapulgite is endowed with acid resistance and salt resistance as well as a toxic-free property; the attapulgite modification agent is uniform in modification and unlikely to drop, can be used as an adsorbing agent or a flocculating agent and can remove heavy metal ions, such as copper, in water.

The invention discloses a detachable solid fuel suspension combustion experiment testing device and a detachable solid fuel suspension combustion experiment testing method, belonging to the technical field of a solid fuel combustion experiment. The testing device comprises a suspension combustion mechanism, a combustion data acquisition mechanism, a gas supply mechanism and an ignition mechanism; a base is arranged on a base bracket; the lower end hole of a primary combustion pipe is communicated and in detachable connection with the upper end hole of an inner pipe of the base; the lower end hole of a secondary combustion pipe is communicated and in detachable connection with the upper end hole of the primary combustion pipe; two porous metal plates are respectively arranged at the upper end hole of the inner pipe of the base and the upper end hole of the primary combustion pipe. The testing method comprises the steps of placing fuel; enabling the fuel to suspend; burning; acquiring combustion data; finishing the experiment. The device and the method mainly have the functions of realizing visualization of a combustion state, realizing uniform combustion at a suspended state, carrying out a combustion test on multiple samples for once and enabling the large-particle samples to be easily ignited.

The invention discloses a preparation method of a conductive macromolecule non-covalent functionalized graphene modified electrokinetic energy conversion polymer material. according to the method, conductive macromolecules are non-covalent functionalized onto the surface of nano-graphene; and then, the conductive macromolecule non-covalent functionalized graphene nano-material undergoes ultrasonic-assisted dispersion into an electrokinetic energy conversion polymer solution so as to finally obtain a conductive macromolecule non-covalent functionalized graphene/electrokinetic energy conversion polymer composite material. The electro-stimulate response intelligent polymer composite material obtained by the method has high dielectric constant and high electrodeformation value. When content of poly(3,4-ethylenedioxythiophene): polystyrolsulfon acid non-covalent functionalized graphene nanofiller is 3%, dielectric constant of the modified polyurethane dielectric elastomer intelligent material reaches up to 350 at room temperature and at the frequency of 1000 Hz, dielectric loss is 0.20, and loss modulus is 200 MPa. Under the action of a 32.2 MV/m electric field, electrodeformation value in the thickness direction reaches 162%. Performance of the material provided by the invention is far more excellent than performance of a regular nano-ceramic or nano-conductive filler modified intelligent polymer composite material.

The invention discloses a composite nanotube composed of a molybdenum disulfide-carbon-carbon nanotube and a preparation method thereof. The method comprises the following steps: firstly, orderly dissolving ammonium tetrathiomolybdate and a carbon high-molecular polymer with surface activity into water; then adding a multiwalled carbon nanotube; centrifuging, drying and burning after carrying out ultrasonic dispersing, so as to prepare MoS2-C/CNTs. By using the surface activity of a carbon high-molecular polymer, the molybdenum disulfide is more evenly dispersed on the surface of the carbon nanotube; on the other hand, the conductivity of a compound is improved through the compound of amorphous carbon and molybdenum disulfide left on the surface of the carbon nanotube when a mixture is burnt at high temperature.

The invention relates to a nano composite cold galvanized coating and a preparation method thereof and belongs to the field of nano coatings. The nano composite cold galvanized coating is prepared from the following raw materials in parts by weight: 2-25 parts of acrylic resin, 0.1-5 parts of an assistant, 75-98 parts of zinc powder and 1-70 parts of a solvent, wherein the zinc powder is a mixture of micro-scale zinc powder and nano-scale zinc powder modified by a fluorosilane coupling agent, so that the dispersity of the zinc powder is increased; the compatibility with resin is improved; the coat made of the nano composite cold galvanized coating has high hydrophobic property; the water contact angle is greater than or equal to 135 degrees; the porosity of the cold galvanized coating is significantly reduced; the corrosion resistance of the coating is improved; the nano composite cold galvanized coating disclosed by the invention can be widely applied to anti-corrosion engineering with a novel steel structure, old and new hot-dip galvanizing structures and an electric galvanized steel structure; and the difficulty in corrosion maintenance of transmission and substation facilities and substation equipments can be conveniently and rapidly solved.

The invention belongs to the field of biological sensor technique, in particular to a glucolase electrode and a preparation method thereof on the basis of a magnetic carbon nano-tube. The preparation method of the invention disperses the carbon nano-tube ultrasonic into a chitosan acid aqueous solution containing ferric ions and ferrous ions so as to prepare the three-composition nanometer magnetic composite material which consists of the carbon nano-tube, ferroferric oxide and chitosan; the three-composition nanometer magnetic composite material is dispersed into glucose oxidase aqueous solution, adsorbs the glucolase and is dispersed into glutaraldehyde aqueous solution; by primary amino-group reaction crosslinking, the glucose oxidase is fixed on the surface of the magnetic composite material, thus obtaining the updatable glucolase electrode based on the magnetic carbon nano-tube; the glucolase electrode provided by the invention has high response speed, wide detection consistency range, simple and convenient electrode processing and simple and convenient preparation of the immobilized enzyme magnetic material; when the enzyme is deactivated, the electrode is regenerated by updating the enzyme material of the electrode surface based on the magnetic carbon nano-tube, therefore, the consumption of the electrode material is greatly reduced, the resource is saved and the cost of enzymatic determination is reduced.

The present invention relates to an inferior coker gas oil hydrotreatment method. The catalyst is prepared by successively loaded a protection agent, a demetallization agent, a desulfurization agent and a denitrification agent from top to bottom with a volume ratio of 0.1-10:0.5-20:0.5-20:5-60. The catalyst is in accordance with grain size distribution and activity distribution. A magnesium aluminate spinel-macropore alumina carrier is modified by organosilicone in surface, and loaded with Mo and Ni to obtain the protection agent. The alumina-macropore alumina-zeolite carrier is pretreated by organosilicone and at least one selected from the group consisting of ethanol, propanol, and butanol, loaded with Mo and Ni to obtain the demetallization agent, loaded with W-Mo-Ni to obtain the denitrification agent, and loaded with Co-Mo -Ni to obtain the desulfurization agent. The method helps to improve the dispersion state of active metal components and the interaction thereof with the carrier, and improve the utilization efficiency of the active components thereby enhancing the activity of the catalyst. The raw material after hydrotreatment can be directly used as FCC or hydrocracking raw materials.

The invention discloses a preparation method and application of a magnetic graphene oxide adsorbent material. The preparation method comprises the steps that chitosan reacts with ferrous ions and ferric ions to synthesize magnetic chitosan nanoparticles; the magnetic chitosan nanoparticles are subjected to reduction and acidification by carbon disulfide, then connect onto the surface of graphene oxide by an amidation reaction, thus a new magnetic graphene oxide adsorbent material capable of adsorbing metal ions, especially copper ions is obtained. The graphene oxide has unique two-dimension monoatomic layer structures, so that the surface area of the graphene oxide is large, then a large number of oxygen-containing groups distributed on the surface of the graphene oxide are capable of well adsorbing the metal ions in wastewater, and the magnetic chitosan modified by CS2 is added, not only are the adsorbability and the dispersibility in water improved, but also the separation is easier under the action of an applied magnetic field. The defects of low adsorbing capacity, difficult recovery and reuse, long separating time, low adsorption efficiency and the like in a process that a traditional adsorption material adsorbs the copper ions are overcome.

The invention relates to a waste polymer modified asphalt composition. The waste polymer modified asphalt composition comprises following components in parts by weight; 60-85 parts of petroleum asphalt, 6-20 parts of a waste polymer material, 1-8 parts of a compatilizer, 1-1.5 parts of SBS, 0.01-0.5 parts of a stabilizing agent, and 1-10 parts of one or more of native asphalt, coal pitch or biological asphalt. The waste polymer modified asphalt composition can well increase high-temperature storage stability of waste polymer material modified asphalt; pre-swelling performance of the polymer material and similar compatibility with asphalt are improved as the compatilizer is added; storage stability of the waste polymer material in asphalt can be improved extremely as a small quantity of SBS and a small quantity of the stabilizing agent are added; producing cost of the composition can be decreased as the native asphalt, coal pitch or biological asphalt replaces a portion of the petroleum asphalt; the prepared modified asphalt is excellent in high-temperature performance and low-temperature ductility; and the preparation method is simple, safe, and convenient for industrial application.

An improved throat (2) for transmitting acoustic energy from a source driver unit (7) to a feeder section (3) of a directivity controlling acoustic horn is disclosed. The throat (2) comprises: a circular throat entrance (2i) connectable to the source driver unit (7); a rectangular throat exit (2e) connectable to or integral with the feeder section (3); and a circular cross-section to rectangular cross-section transition portion (2a) extending between the throat entrance (2i) and the throat exit (2e). The throat (2) is shaped such that its profiles initially diverge from an axis longitudinal to the throat (14) at the same angle in a direction from the throat entrance (2i) towards the throat exit (2e). Such a throat, when fitted in an appropriate acoustic horn with a source driver unit having a taper matching the aforesaid profile angles, provides a smooth transition for sound waves propagating out from the source driver unit into the horn.

The invention relates to a flame retardant conducting polymer composition with positive temperature coefficient (PTC) effect or characteristic. The composition is prepared by the following steps: placing a raw material mixture consisting of a crystalline thermoplastic polymer, a conductive filler, an adjuvant, a phosphorus flame retardant, a nitrogen flame retardant, a metal hydroxide and a polar polyolefin copolymer into a mixing device for mixing at the mixing temperature which is at least 20 DEG C higher than melting point of the crystalline thermoplastic polymer for 10-30 minutes; irradiating and crosslinking the mixed mixture with electron beams or gamma rays to obtain the composition. The PTC strength of the prepared target composition is more than 10<3>, resistivity is 10<3>omega.cm-10<5>omega.cm at the room temperature (25 DEG C), and oxygen index is larger than 27. The prepared composition also has the advantages of even joule heat distribution, excellent self-temperature conditioning property, low smoke and non-toxicity, and can be used for preparing environment-friendly self-temperature control electric heating devices with higher safety and reliability.

The invention relates to the technical field of concrete admixtures, in particular to a clay-resisting slow-release slump-retaining type polycarboxylate superplasticizer and a preparation method thereof. With polyether macromonomers, unsaturated carboxylic acid, unsaturated carboxylic ester, dibasic acid anhydride, a crosslinking agent, amide monomers, unsaturated phosphate ester, phosphate, an oxidizing agent , a reducing agent, a chain transfer agent, a neutralizing agent and water as raw materials, the clay-resisting slow-release slump-retaining type polycarboxylate superplasticizer is synthesized at normal temperature. Ester groups, amide groups and phosphate ester are introduced into the molecular structure of the polycarboxylate superplasticizer, and light crosslinking of the polycarboxylate superplasticizer is realized through the long-chain ester crosslinking agent, so that the superplasticizer has a good clay-resisting and slump-retaining effect and has the advantages of low mixing amount, high water reducing rate, high adaptability to clay-containing sand, good slump retaining performance and the like; besides, only normal-temperature polymerization is needed, the processis simple, the production cost is low, and the superplasticizer is suitable for industrial production.