345results about How to "Uniform pore structure" patented technology

The invention relates to a preparation method of foamed aluminum, in particular to a method for preparing the foamed aluminum by primarily foaming a melt, which can prepare a foamed aluminum product by primarily foaming aluminum. The method comprises the following steps of: starting a thermoelectric furnace for heating to 800 DEG C until the aluminum is fully molten; lowering the temperature to 680 DEG C, adding metal calcium into aluminum liquid and stirring so as to increase the surface viscosity of the melt; pretreating titanium hydride, adding pretreated titanium hydride into the melt and stirring to uniformly distribute the titanium hydride in the melt for full decomposing; and heating a mold, putting the melt into the thermally-treated mold, preserving heat and foaming at the temperature of 650 DEG C, taking a prefabricated member out, performing air cooling to shape the high-temperature foam melt in the mold and taking the prefabricated member out for water cooling so as to obtain the foamed aluminum product. When applied to a filling piece of a regular cavity, the method simplifies a process, greatly lowers production cost, is suitable for diversified development of industrial production and brings convenience to the research of specific technology.

The invention discloses lithium ion battery negative pole size which consist of graphdiyne, Super-p, CMC, SBR, NMP and deionized water, wherein the mass ratio of the graphdiyne to the Super-p to the CMC to the SBR solution (the solid content is 50%) to the NMP to the deionized water is 95: (0.8-2): (1.0-2): (4-7): (5-8): (110-120). The preparation method of the lithium ion battery negative pole size comprises the following steps: mixing the CMC and the NMP at a low speed; adding the deionized water to evenly mix at a high speed; screening the CMC solution through a 200-mesh screen to stand for 8-12h; evenly mixing the Super-p and the CMC xolution at a high speed; adding the graphdiyne and the SBR in sequence to evenly mixing at a high speed; and finally adjusting the viscosity and screening through a 150-200-mesh screen to obtain the lithium ion battery negative pole size which is good in performance.

The invention discloses a high-strength polyimide nano fiber porous membrane. The porosity of the polyimide nano fiber porous membrane is 70-85%, the average pore diameter is 100-250 nm, the glass transition temperature is 260-400 DEG C, the tensile strength is 8-70 MPa, and the dimensional shrinkage after high-temperature 200 DEG C heat treatment for 1 hour is less than 0.3%. The chemical composition of the polyimide nano fiber porous membrane is copolymerized polyimide or blended polyimide. The invention also discloses a preparation method and application of the polyimide nano fiber porous membrane. The polyimide nano fibrous membrane disclosed by the invention is a membrane material having the advantages of high strength, low dimensional change rate, high porosity and favorable thermal properties.

The invention relates to a metal-doped carbon/sulfur compound, and preparation and application thereof. The metal-doped carbon/sulfur compound is prepared through the following steps: blending a carbon-containing organic substance and a metal salt solution, then adding a template agent, roasting at high temperature, and performing hot melt sulfur filling. In the preparation process, the metal element is simultaneously doped in the carbonization process, so that more abundant pore structures are formed in the carbon material, the pore volume and specific area of the carbon material are improved in the carbonization process, the reaction zone of the active substance sulfur is increased, the graphitization temperature of the carbon material is lowered, and the own stability of the carbon material is enhanced while the loading capacity of the active substance sulfur is improved.

The invention provides a method for the preparation of the composite chromatographic stuffing of the polymer carbon nanometer tube, comprising: taking polystyrene-divinylbenzene and carbon nanometer tube as the base material, adopting the dispersion polymerization method to prepare monodispersity linear polystyrene microsphere seed, activating the feed, taking uni-step seed swell method to prepare the polystyrene-divinylbenzene and carbon nanometer tube composite microsphere, extracting to remove the pore-foaming agent to obtain the chromatographic stuffing, packing column by the uniform method. The stuffing prepared by the method has uniform granularity without screening and enhanced hardness compared with the traditional polymer chromatographic stuffing, can bear bigger pressure and is suitable for the new UPLC. The obtained polystyrene-divinylbenzene and carbon nanometer tube liquid phase chromatographic column can be stably used for the ion-pair chromatograph for along time and better performs the simultaneous separation of over ten organic acids.

The invention provides a liquefied petroleum gas dechlorination adsorbent and an application method thereof. The technical scheme of the invention is as follows: the adsorbent comprises a molecular sieve and metallic oxides with a chlorine adsorption function, wherein the mol ratio of silicon atom to aluminum atom in the molecular sieve is 1 to 45; the specific surface area of the molecular sieve is 300 to 650 m2/g; the weight ratio of the molecular sieve to the metallic oxides with the chlorine adsorption function is 45-98: 25-50; the molecular sieve is one or more selected from the group consisting of X type, Y type, A type and ZSM-5 type molecular sieves; and the metallic oxides with the chlorine absorption function comprise two metallic oxides, i.e., magnesium oxide, and one selected from the group consisting of zinc oxide, nickel oxide, copper oxide, platinum oxide, alumina, iron oxide or copper-based metal oxide. The adsorbent provided by the invention has the advantages of large specific surface, uniform pore structure, great dechlorination adsorption capacity, good stability, capability of maintaining high adsorption and dechlorination activities through multiple regeneration, and high adsorption and dechlorination efficiencies.

The invention belongs to the fields of building materials and construction technology. Light-weight concrete consists of a concrete base layer and waterproof surface layers, wherein the concrete base layer comprises the following components in parts by weight: 100 parts of cement, 0.1-10 parts of chrysotile fibers, 0.01-2 parts of water repellent, 10-30 parts of pulverized fuel ash, 0.1-6 parts of water reducer, 50-200 parts of water, and 1-20 parts of foaming agent or air entraining agent; the upper side and the lower side of the concrete base layer are coated with the waterproof surface layers which comprise the following components in parts by weight: 100 parts of penetrating type organosilicon waterproofing agent, 0.1-20 parts of nano TiO2, 0-2 parts of activity enhancer, 0.01-5 parts of dispersion stabilizer, and 50-200 parts of solvent. Correspondingly, the microporous structure of the foam concrete or air-entrained concrete is uniform, and the mechanical performance is improved.

The invention discloses a method for using blast furnace slag to produce a micro-crystalline light brick. The light brick uses the blast furnace slag as main raw material. The method for using the blast furnace slag to produce the micro-crystalline light brick includes that tempering and clearing the blast furnace slag to obtain slag with qualified ingredients, feeding to a water quenching pool to form micro-crystalline particles through water quenching, grinding and sieving the micro-crystalline particles to obtain micro-crystalline particles with proper granularity, uniformly mixing with foaming agent, putting the mixture in a casting mould, and sintering to form the micro-crystalline light brick with uniform air bubbles and stable ingredients. Compared with the traditional clay brick, the micro-crystalline light brick has lower density and higher intensity, so that the micro-crystalline light brick has better bearing ability, and moreover, the micro-crystalline light brick has good heat preservation effect and sound insulation effect due to the uniform air hole structure, so that the micro-crystalline light brick can replace the clay brick or ordinary light brick in a certain degree to serve as novel building material.

A ZIF-9-based porou carbon/carbon fiber composite material and preparation method thereof belongs to the technical field of a preparation method of a metal nanoparticle doped porous carbon/carbon fiber conductive composite material, can solve the problems of poor conductivity and poor stability of the existing composite carbon material, wherein the carbon fiber of a carbon fiber fabric is taken asa growth substrate, and high-density arranged ZIF is grown on the growth substrate; 9, carbonize at high temperature in an inert gas atmosphere to generate porous carbon/carbon fib composite material, and that invention realizes a ZIF-9-based porous carbon and conductive substrate integrated conductive network structure, lithium sulfide batteries, sodium sulfide batteries, lithium-air batteries and fuel cells, electrocatalysis and other fields have a wide range of applications.

The invention relates to high-strength and high-toughness foam aluminum and a preparation method thereof. The density of the foam aluminum is 0.4-1 g/cm3; the average size of foam holes is 2-5 mm; the hole walls consist of aluminum basal bodies and reinforcing particles dispersed therein; and the reinforcing particles and the aluminum basal bodies form high-strength-bonded metallurgy interfaces. Firstly, aluminum basal body powder, the reinforcing particles and foaming agent particles are uniformly mixed and coldly pressed to prepare a rough blank; and the rough blank is thermally deformed to prepare a foamable prefabricated body after vacuum heat degassing, and is heated and foamed to prepare the foam aluminum. The product has the characteristics of high strength, high toughness and high energy absorption, and can be applied to light support structural parts or high-damping vibration reduction and energy absorption parts in the fields of vehicles, rail traffic and spaceflight war industry; and the preparation method is flexible, strong in designability, nearly suitable for preparation of all alloy system foam aluminum, can randomly add matched reinforcing particles according to the alloy performance, and can be used for customizing the foam aluminum with different mechanical performances to satisfy the demands in all fields.

The invention discloses a preparation method of silicon dioxide aerogel, and belongs to the technical field of a nano-porous material. The preparation method includes steps of performing hydrolytic polymerization on methyl trimethoxy silane to obtain a wet gel; staying the wet gel under a certain temperature and acquiring a contracted wet gel; sealing and aging the contracted wet gel through solvent; drying the aged wet gel and acquiring the aerogel. Through applying the methyl trimethoxy silane and the surface active agent to prepare the wet gel, the wet gel can bear heavy contraction and deformation; through staying, fluid in the wet gel hole is volatilized, and the wet gel is contracted; under the condition of low addition of the methyl trimethoxy silane, the aerogel with high density can be acquired; meanwhile, the aerogel grain has small dimension, the hole structure is more uniform, and the contact area between grains is bigger; thus the optical transparency and the mechanical performance of the aerogel are promoted.

The present invention provides a preparation method for a high temperature resistant macroporous cation exchange resin catalyst. According to the preparation method, a linear chain saturated acid with carbon atoms of 4-25, any one component selected from a unsaturatcd fatty acid glyceride, or a mixture is adopted as a pore-foaming agent to prepare styrene-divinylbenzene copolymer containing the pore-foaming agent, wherein the mixture comprises two or more components selected from the unsaturatcd fatty acid glyceride; an organic solvent is adopted to extract the pore-foaming agent and low molecular weight impurities in the copolymer; the macroporous polymer is subjected to a halogenating reaction in the presence of a catalyst; the resulting halogenated product is subjected to a sulfonationreaction. According to the present invention, the polarity of the used pore-foaming agent by the preparation method of the present invention is similar to the polarity of the monomer, such that uniform porous channels can be formed during the polymerization process; the used materials by the preparation method of the present invention have characteristics of environmental protection, no toxicity,cheap price and easy availability; during the preparation process of the present invention, only a hydrocarbon solvent with low boiling point and low toxicity is adopted to clean the pore structure, such that the operation is simple and three wastes are not discharged; the pore structure-cleaned styrene-divinylbenzene copolymer is subjected to the halogenation and the sulfonation to obtain the resin catalyst with uniform pore structure, good high temperature resistance and high catalytic activity.

The present invention relates to a preparation method of a monolithic BEA molecular sieve catalyst for direct N2O catalysis decomposition. According to the monolithic BEA molecular sieve catalyst, cordierite is adopted as a carrier, a Fe and Co metal ion modified BEA molecular sieve is adopted as an active component, and a silica sol and an alumina sol are adopted to load the modified BEA molecular sieve on the cordierite to prepare the monolithic catalyst, wherein a ratio of the silica sol to the alumina sol is adjusted and the silica sol, the alumina sol and the modified molecular sieve are subjected to the optimal activity matching during the preparation process so as to prepare the high activity monolithic catalyst. Research results show that under reaction conditions of an airspeed of 4000 hour<-1> and a ratio of He to N2O of 65:35, the monolithic catalyst formed by matching the Co-BEA and 5% silica sol has the optimal activity, and the monolithic catalyst formed by matching the Fe-BEA and 5% alumina sol has the inferior activity. The monolithic BEA molecular sieve catalyst prepared by the preparation method has good catalytic activity and thermal stability, wherein a N2O conversion rate is 100% at a temperature of 500 DEG C.

The invention provides a preparation method of a nano porous high-efficiency heat insulation board, belonging to the field of nano porous heat insulation materials. The preparation method comprises the following processes: uniformly mixing nano powder with fiber, a bonding agent, an opacifier, a plasticizer, a drying control agent, a dispersant and a right amount of dry-and-wet degree regulating reagent in a mechanical and chemical dispersion combined method; moulding in a manner of dry pressing moulding, curtain coating moulding or extrusion moulding and the like; and controlling drying conditions, drying a moulded sample, and then coating a reflecting layer with certain thickness and material quality, thus obtaining the nano porous high-efficiency heat insulation board. The invention has the advantages that the preparation method is simple and feasible, the prepared nano porous heat insulation board has high strength, uniform hole structure and good heat insulation performance.

The invention carried out a process to produce foamed aluminium alloy with the secondary foaming. The process is: first to melt the aluminium alloy and add the Ca into the molten, then adding into the titanium hydride to get the first foamed aluminium alloy, next to heat the first alloy and make it preformed unit, last to foam the preformed unit and cool to get the secondary foamed aluminium alloy.

The invention belongs to the field of medicine technology, and relates to a preparation method of mesoporous titanium dioxide with high biological compatibility and a controllable structure and application of the mesoporous titanium dioxide as a hard soluble drug carrier. The method adopts a soft template method, namely, adopts a surfactant as a structure guiding agent, isopropyl titanate as titanium source, and double distilled water as a reaction rate modifier to prepare the mesoporous titanium dioxide having different mesoporous passage structures. The prepared mesoporous titanium dioxide is of large specific surface area, chemical stability, non-toxic effect, no side effect and good biocompatibility, and is suitable for being used as the hard soluble drug carrier. The application of the titanium dioxide as the hard soluble drug carrier can lay a theoretical foundation for uses of multivariant functional carriers. The method adopts a solvent method and a fusion method to perform embedding and adsorption on a drug so as to uniformly disperse the drug inside the mesoporous or on surface of the carrier. The drug carrier system can assist in significantly enhancing water solubility of a hard soluble drug and improving dissolution rate in vitro and oral bioavailability.

The invention discloses a preparation method of high-temperature resistant SiC aerogel, relates to a preparation method of aerogel, and aims to solve the technical problems of low yield and easily damaged microstructure of the existing method for preparing the SiC aerogel. The method comprises the following steps: 1, preparing liquid A and liquid B and mixing the liquid A and the liquid B to obtain hydrolysate; (2) preparing wet gel; (3) preparing aerogel; (4) reacting the aerogel with magnesium powder, cleaning and drying to obtain the SiC aerogel. The method adopts magnesium thermal reduction to reduce an aerogel precursor into the SiC aerogel under the protection of an inert gas. The production of SiO gas during the reduction of R1SiO1.5 is successfully avoided, and the morphology of the product is kept intact to the greatest extent. The silicone aerogel with uniform pore structure and complete shape is prepared by supercritical drying, and belongs to the field of aerogel preparation.

The invention relates to a non-autoclaved foam concrete material and a preparation method of the material. The non-autoclaved foam concrete material is characterized by comprising the following raw material ingredients in parts by weight: 85-96 parts of cement, 2-8 parts of fine sand, 2-10 parts of slag powder, 1.4-2.2 parts of chemical foaming agent, 0.7-1.5 parts of additive, 0.5-1.0 part of fiber and 1-1.5 parts of assistant, wherein the additive is a foam stabilizer, a water reducer and an early strength agent, and a water-material mass ratio is 0.55-0.6. The prepared foam concrete material can reach various performance indexes (foam concrete JG/T 266-2011); various performance is excellent; and the method is simple and practicable, low in cost, obvious in energy conservation effect and appropriate for large-scale popularization and application.

A Raney nickel catalyst used for low-pressure hydrogenation of dinitrotoluenem. The catalyst is characterized by comprising, by mass, 80-90 wt% of nickel, 5-10 wt% of aluminium and 1.65-10 wt% of an auxiliary agent metal, wherein the nickel is in the form of a simple substance, the aluminium is in the form of the simple substance of an oxide and the auxiliary agent metal is in the form of the oxide. The catalyst is low in price and has an excellent performance of catalytic hydrogenation of the dinitrotoluenem (DNT) without an additional solvent and under a low-pressure condition of 1Mpa.