36results about How to "Maintain porous structure" patented technology

The invention belongs to the technical field of inorganic powder surface modification, and in particular relates to modified fly ash with surface coated with SiO2 and a preparation method and use thereof, the method is as follows: Step 1) fly ash iron removal, step 2) capillary adsorption paraffin, step 3) coating of the surface with SiO2, the water absorption rate of the modified fly ash prepared by the method is 20%-22%, the whiteness is 20-30, the near infrared reflectivity is 60-80%, the coefficient of thermal conductivity is less than 0.25W / M.K; and the modified fly ash prepared by the method has good barrier thermal insulation and reflective thermal insulation performances. A thermal insulation coating prepared from the modified fly ash has excellent thermal insulating property, can be used in epoxy floor coatings, acrylic coatings for exterior wall, casting coatings and the like, and is free of the color and the construction problems, and high in added value.

The invention relates to a cathode material of a lithium sulfur battery and a preparation method of the cathode material. The cathode material is characterized by comprising the following raw material composition in parts by mass: 7 to 10 parts of steady-state lithium powder, 3 to 8 parts of a carbon material and a solvent. A mixture formed by mixing the steady-state lithium powder, a vertical array carbon nano tube (VACNT) and mesoporous carbon according to the mass ratio of 10:1 is specially adopted to serve as a carbon material in a cathode to prepare a cathode mixing slurry; therefore, use of an adhesive in the cathode slurry is avoided, and the cathode material of the lithium sulfur battery is better in performance. Meanwhile, the battery which is matched with an optimally selected anode material and is prepared by the preparation method disclosed by the invention is lower in impedance; the shuttle effect and dendritic crystal growth in the continuous charging and discharging processes can be effectively weakened; compared with a conventional metal lithium foil, the cathode material is higher in circulation performance and rate capability.

The invention relates to a negative electrode material of a lithium-sulfur battery and a preparation method of the negative electrode material. The negative electrode material comprises the following compositions based on mass: 5-10 parts of steady-state lithium powder, 3-7 parts of carbon material, 1 part of binding agent and a solvent. According to the preparation method, a mixture mixed by the steady-state lithium powder, carbon nanosphere / carbon nanotube and mesoporous carbon according to mass ratios of 5:2:1 is particularly selected as the carbon material in a negative electrode to prepare a negative electrode mixed paste, so that the negative electrode material of the lithium-sulfur battery has more excellent performance; the prepared battery according to the method is endowed with relatively small impedance, a shuttle effect and dendrite growth during the continuous charging / discharging process can be effectively reduced, and the battery shows batter cycle performance and rate performance than those of a conventional metal lithium foil.

The invention discloses a diatom-ooze decorative material and a preparation method thereof. The diatom-ooze decorative material is prepared from the following raw materials in parts by weight: 40-60 parts of diatomite, 1.0-1.5 parts of palygorskite, 3.0-3.5 parts of magnesium silicate, 1.5-2 parts of cellulose, 50-60 parts of heavy calcium carbonate, 20-25 parts of coarse sand, 4-5 parts of ash calcium powder, 2.0-2.5 parts of nano titanium dioxide, 1-3 parts of antibacterial agent and 0.2-0.4 part of defoaming agent. The diatom-ooze decorative material prepared by the method has the advantages that because of no need of adding chemical adhesive and no-adhesive wall decoration, the environment-friendly effect is achieved; because of better water absorptivity and insulating-oxygenating effects and a better adsorbing effect and wall-surface texture, the environment-friendly effect is achieved and the comprehensive effect is good.

The invention provides a reagent for enhancing the mechanical performance of an electrostatic spinning film. The regent is prepared from a solvent and a nonsolvent for a film material in a mixed mode; the solvent is a substance capable of dissolving the electrostatic spinning film or a mixture of two substances capable of dissolving the electrostatic spinning film, and the nonsolvent is a substance incapable of dissolving the electrostatic spinning film or a mixture of two substances incapable of dissolving the electrostatic spinning film; as for the mixed ratio of the solvent to the nonsolvent, the quantity of the solvent can be continuously increased in a certain quantity of the nonsolvent till the material of the electrostatic spinning film is swelled; after contact parts between fibers are swelled, combining is tighter, and after the solvent is volatilized, the mechanical performance of the film can be greatly improved. According to the reagent and method for enhancing the mechanical performance of the electrostatic spinning film, the elasticity modulus, the breaking strength and the toughness of the electrostatic spinning film can be enhanced at the same time.

The invention relates to a negative electrode material of a lithium-sulfur battery and a preparation method of the negative electrode material. The negative electrode material comprises the following compositions based on mass: 5-10 parts of steady-state lithium powder, 3-7 parts of carbon material, 1 part of binding agent and a solvent. According to the preparation method, a mixture mixed by the steady-state lithium powder, carbon nanosphere / carbon nanotube and mesoporous carbon according to mass ratios of 5:2:1 is particularly selected as the carbon material in a negative electrode to prepare a negative electrode mixed paste, so that the negative electrode material of the lithium-sulfur battery has more excellent performance; the prepared battery according to the method is endowed with relatively small impedance, a shuttle effect and dendrite growth during the continuous charging / discharging process can be effectively reduced, and the battery shows batter cycle performance and rate performance than those of a conventional metal lithium foil.

The invention provides modified fumed silica with a flat structure and high tap density as well as a preparation method and application of the modified fumed silica. By utilizing a rotary vacuum reaction kettle, under the action of a structured modification additive and the gravity action of the fumed silica in the rotary process, the fumed silica is directionally gathered to form a flat structure, so that the tap density of the modified fumed silica is improved, and the fumed silica is endowed with good low-thickening characteristic; the viscosity in a rubber compound of the rubber is reduced; and meanwhile, the porous structure of the fumed silica can be kept, it is ensured that the fumed silica has the high specific surface area, and the high reinforcing characteristic of the fumed silica in rubber is achieved.

The invention provides hydrogel gauze capable of preventing blood adhesion, and belongs to the technical field of biochemical engineering. The preparation method of the hydrogel gauze comprises the following steps: S1, adding a monomer and hydroxyl silicone oil into a solvent, and fully stirring and emulsifying to obtain a uniform emulsified solution; and adding a photoinitiator and N-aminoethyl-3-aminopropyl methyl dimethoxy silane, and fully stirring and mixing, so as to obtain a gel precursor solution, wherein the monomer is composed of a first monomer and a second monomer, the first monomer comprises acrylamide, and the second monomer comprises a silane coupling agent containing double bonds; S2, soaking gauze in the gel precursor solution, and enabling the soaked gauze to be subjected to light curing treatment to prepare the hydrogel gauze capable of preventing blood adhesion. The hydrogel gauze retains the softness and air permeability of original gauze, and meanwhile has a good anti-adhesion effect on solutions such as water, protein and blood.

The invention belongs to the technical field of solar photo-thermal conversion, and discloses a composite photo-thermal conversion material based on shaddock peel and preparation and application of the composite photo-thermal conversion material. The method comprises the following steps of: (1) removing yellow outer skins of shaddock peels to obtain white shaddock sacs; and (2) soaking the shaddock sacs in an aqueous solution of manganese carbonate, and carrying out adsorption treatment, drying and carbonization treatment to obtain the composite photo-thermal conversion material based on shaddock peel. The method disclosed by the invention is simple, wide in raw material source and low in cost, and meanwhile, the prepared composite photo-thermal conversion material based on shaddock peel is good in photo-thermal conversion effect and excellent in salt-resistant effect. The composite photo-thermal conversion material based on shaddock peel is used for the field of solar seawater desalination and the field of purification of printing and dyeing wastewater and / or heavy metal ion wastewater, and the purification effect is good.

The invention belongs to the technical field of nano material preparation, and particularly relates to a method for enhancing the mechanical property of an electrospun fibrous membrane by adding a bonding layer, which is characterized in that a low-volatility solvent is added in a bonding layer spinning solution, and the receiving distance is reduced in the electrostatic spinning process, so that the mechanical property of the electrospun fibrous membrane is enhanced. Due to the low-volatility solvent, the fibers still have certain fluidity when reaching the receiving plate, and are adhered to the compact layer interfibrous membrane under the action of gravity; in addition, the contact parts of the bonding layer and other layers are also adhered, so that the fiber layers are tighter; and finally, the non-woven layer is bound on the bonding layer to form the electrospun fiber membrane with a three-layer structure. The method is easy to operate, high in controllability and good in reinforcing effect, and the porous structure on the surface of the electrospun fiber membrane can be kept; and the porosity of the adhesive layer and the cocrystallization degree during stretching can be adjusted only by adjusting the receiving distance and the content of the low-volatility solvent. The mechanical property of the electrospun fibrous membrane is greatly improved under the condition that the structure is not damaged, so that the electrospun fibrous membrane with the thickness of 200 mu m can bear tension greater than 32 N.

The invention discloses a catalytic oxidation catalyst and a preparation method thereof. The catalytic oxidation catalyst is based on the weight of the catalyst, and its composition includes: the content of clay is 20%-50%, the content of activated carbon is 20%-55%, and the content of ferromanganese slag is 10%-45% , the rare earth content is 0.2%-5%. The preparation method comprises: mixing clay, activated carbon, ferromanganese slag, and rare earth sources, molding, drying, and high-temperature roasting in an oxygen-free atmosphere. The catalytic oxidation catalyst not only turns waste catalysts into valuables, but also has good activity and stability, and is especially suitable for the catalytic oxidation process of wastewater ozone.

The invention discloses a method for removing cesium ions based on bentonite-chitosan composite microspheres, which is characterized in that: adding magnetic porous bentonite-chitosan composite microspheres into waste water containing radionuclide cesium ions, and then shaking at a constant temperature. The invention has excellent adsorption performance for cesium ions, large adsorption capacity, insensitive to pH, strong anti-interference ability for coexisting ions, wide application range, and can be recovered by magnetic field after wastewater treatment, simple solid-liquid separation, and environment-friendly; The entire removal method has simple steps, and low cost and energy consumption.

The invention relates to a preparation method of a lithium-sulfur battery, which is characterized by comprising: in parts by mass, consisting of the following raw material composition: 7-10 parts of steady-state lithium powder, 3-8 parts of carbon material and solvent. In the present invention, a mixture of stable lithium powder and vertically arrayed carbon nanotubes (VACNT) and mesoporous carbon is specially selected as the carbon material in the negative electrode to prepare the negative electrode mixed slurry according to the mass ratio of 10:1. The use of the binder in the slurry makes the lithium-sulfur battery negative electrode material have more excellent performance. At the same time, with the optimally selected positive electrode material, the battery prepared by the preparation method of the present invention shows a small impedance, which can effectively weaken the shuttle effect and dendrite growth in the continuous charge and discharge process, and shows a better cycle than conventional metal lithium foil. performance and rate performance.

The invention discloses a MOF-derived gas separation membrane and its preparation method and application. The preparation method of the MOF-derived gas separation membrane is as follows: H 3 BTC and Al(NO 3 ) 3 9H 2 Dissolve O in deionized water, adjust the pH of the system to 1.9-2.0, and add additives, the reaction is complete to obtain MIL-100Al and tri-block copolymer Dissolve in alcohol at room temperature and under ultrasonic conditions, and then add 37%wt hydrochloric acid solution In the process, ultrasonically mix at room temperature for 24 hours, and then copolymerize at 100°C to 120°C for 24 hours. After the reaction is complete, a solid mixture is obtained, which is carbonized at a high temperature to obtain a MIL‑100Al porous carbon material, which is then dissolved in NMP solution, mixed and stirred A clear and uniform viscous solution was obtained, which was then casted to obtain a MOF-derived gas separation membrane. The prepared membrane structure is rich in micropores, and the CO 2 Excellent capture ability, and CO 2 and CH 4 It has good separation selectivity and good recycling ability, which provides a valuable reference for the application of MOF derived materials in the field of membrane materials.

The invention relates to the technical field of catalysts, and provides a method for preparing a modified alumina carrier, the method comprising: preparing alumina colloid; mixing the alumina colloid and silica sol to make a spherical carrier; Aging, drying, and roasting are carried out in sequence to obtain a modified alumina carrier; this method does not need to prepare pseudo-boehmite, and the aluminum source can be formed directly after gelling, filtering, and acid-dissolving, which greatly shortens the production process and reduces equipment costs. Industrialized production; the prepared carrier has the advantages of many acidic active sites, large pore size, high strength and large specific surface area. Provided is a palladium catalyst comprising the above-mentioned carrier and a preparation method thereof, in which the metal reduction process does not require high-temperature roasting and hydrogen reduction treatment, and has the advantages of safety, high efficiency, and low energy consumption; the prepared catalyst has palladium nanoparticles Small particle size, large specific surface area, moderate pore size, high hydrogenation efficiency and selectivity.

A weavable seawater uranium extraction material and its flexible control preparation method relate to the technical field of adsorption materials, in particular a weavable seawater uranium extraction material and its flexible control preparation method. After sonicating bamboo strips with acetone, ethanol, and deionized water, select H 2 o 2 As a solvent, hydrothermal method is used to carry out hydroxylation treatment on it, and finally NH 2 Amidoximation reaction was carried out in alkaline solution of OH·HCl to prepare amidoximated bamboo strips. The method is simple in preparation and operation, low in cost, and can be built into a macroscopic large-area shaped adsorption material. In addition, the oxime nitrogen, amino nitrogen and oxime oxygen in the amidoxime functional group can be chemically coordinated with uranyl ions, which can effectively improve the selectivity of bamboo sticks to uranyl ions and achieve the effect of specifically capturing uranyl ions.

The invention belongs to the technical field of inorganic powder surface modification, and in particular relates to modified fly ash with surface coated with SiO2 and a preparation method and use thereof, the method is as follows: Step 1) fly ash iron removal, step 2) capillary adsorption paraffin, step 3) coating of the surface with SiO2, the water absorption rate of the modified fly ash prepared by the method is 20%-22%, the whiteness is 20-30, the near infrared reflectivity is 60-80%, the coefficient of thermal conductivity is less than 0.25W / M.K; and the modified fly ash prepared by the method has good barrier thermal insulation and reflective thermal insulation performances. A thermal insulation coating prepared from the modified fly ash has excellent thermal insulating property, can be used in epoxy floor coatings, acrylic coatings for exterior wall, casting coatings and the like, and is free of the color and the construction problems, and high in added value.

The invention provides an electrode material of a nanometer porous film capacitor and a preparation method thereof. The method comprises the following steps of: taking nanometer porous gold as a substrate material, putting the nanometer porous gold into a plating solution with nickel nitrate as a main component, and loading nickel on a nanometer porous gold surface by using a chemical plating method; and keeping the nanometer porous gold loaded with the nickel in the air for a certain time. The nanometer porous gold is taken as a substrate, and the metal Ni is modified on the surface of the nanometer porous gold by the interface chemical plating method. The Ni is contacted with oxygen in the air to form NiO, and a nanometer porous nickel oxide film material is obtained. SEM and EDS tests show that the prepared NiO material keeps the porous structure of the substrate and improves the electrical conductivity and ion conductivity of the electrode material. The prepared porous nickel oxide is good super capacitor electrode material with exploitation potential.

The invention relates to a lithium-sulfur battery negative electrode material and a preparation method thereof, which is characterized in that it comprises: in parts by mass, composed of the following raw material composition: 7-10 parts of steady-state lithium powder, 3-8 parts of carbon material and solvent . In the present invention, a mixture of stable lithium powder and vertically arrayed carbon nanotubes (VACNT) and mesoporous carbon is specially selected as the carbon material in the negative electrode to prepare the negative electrode mixed slurry according to the mass ratio of 10:1. The use of the binder in the slurry makes the lithium-sulfur battery negative electrode material have more excellent performance. At the same time, with the optimally selected positive electrode material, the battery prepared by the preparation method of the present invention shows a small impedance, which can effectively weaken the shuttle effect and dendrite growth in the continuous charge and discharge process, and shows a better cycle than conventional metal lithium foil. performance and rate performance.

The invention provides a high tap density modified fumed silica with a flattened structure, a preparation method and application thereof. The present invention utilizes a rotary vacuum reactor, under the action of structural modification additives, and utilizes the self-gravity of gas-phase silica during the rotation process, so that the gas-phase silica is oriented and aggregated to form a flat structure, which improves the efficiency of the modified gas phase. The tap density of silica endows fumed silica with good low-thickening properties and reduces the viscosity of its mixed rubber with rubber; at the same time, the present invention can maintain the porous structure of fumed silica and ensure that fumed silica With a high specific surface area, it realizes the high reinforcing properties of fumed silica in rubber.

The invention relates to a lithium sulfur battery electrode material and a method for manufacturing a lithium sulfur battery by using the electrode material. A negative electrode material includes the following raw materials, by mass, 5-10 parts of stable lithium powder, 3-7 parts of carbon materials, I part of a binder, and a solvent. The stable lithium powder and the carbon materials which are mixture of carbon nano balls, carbon nano tubes, and mesoporous carbons according to the mass ratio of 5:2:1 are used to prepare negative mixed slurry, and then the kithium sulfur battery negative electrode material has excellent performance. The battery manufactured by the method is small in impedance, can effectively weaken the shuttle effect and dendritic growth in a continuous charging / discharging process, and has more excellent circulation performance and rate performance than metal lithium foils.

The invention provides ecological concrete. The ecological concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 0.01-1.0 part of a powdery mixture, 1-10 parts of a cellulosic material, 0-5 parts of an enhanced polymer agent, 400-550 parts of coarse aggregate, 0-100 parts of fine aggregate, 0.01-0.5 part of a water reducing agent and 20-40 parts of water. According to the ecological concrete provided by the invention, with the addition of a curing accelerator of a calcium silicate carrier, the cellulosic material and the enhanced polymer agent, the bond strength, the tensile performance, the anti-fracture performance and the flexural performance of the ecological concrete are improved, and the paving application of the ecological concrete in the fields including building exterior structures, parking lots, footways, squares, parks, roads, river banks, greening templates and the like with high strength requirements is expanded.