1078 results about "Sol-gel" patented technology

The invention belongs to the technical field of catalytic oxidation of carbon-containing industrial waste gas, and particularly relates to a Pd catalyst for catalytic combustion of carbon-containing waste gas as well as a preparation method and application of the Pd catalyst. The invention provides a Pd catalyst for catalytic oxidation of carbon-containing industrial waste gas such as CO and volatile organic pollutants VOCs. The Pd catalyst is obtained by compounding an amorphous CeO2 nano-cluster with a TiO2 substrate (marked as cCeO2 / TiO2) and indirectly regulating the form of Pd through gradient regulation of the content of the amorphous CeO2 nano-cluster by a sol-gel method on the basis of strong interaction of Pd and Ce species. The Pd catalyst prepared by the invention shows excellent low ignition temperature, high performance and certain universality in the catalytic combustion process of carbon-containing industrial waste gases such as CO and low-chain VOCs (Volatile Organic Compounds). In addition, the method for preparing the Pd catalyst is simple to operate and mild in condition, and has great industrial application potential and value.

The invention discloses a preparation method of low-carbon-content high-purity quartz sand, which comprises the following steps: carrying out alkaline hydrolysis and drying on organosilane to obtain alkaline xerogel, putting the alkaline xerogel into a quartz tube of a rotary tube furnace, starting the furnace body, adjusting the rotation rate, heating to a specific low temperature, and introducing nitrogen to replace air; introducing oxygen, controlling the pressure, carrying out oxidation reaction, relieving the pressure to normal pressure after the reaction, pumping and discharging the product, and repeating the oxidation and pumping steps for many times until the tail gas carbon dioxide reaches the standard; raising the temperature, introducing chlorine-containing gas for purification, finally raising the temperature to a sintering temperature, and sintering in an air atmosphere to obtain the low-carbon-content high-purity quartz sand. According to the preparation method, the energy consumption and the equipment cost of the carbon removal procedure are greatly reduced, the specific surface area and the densification performance of the subsequent high-purity quartz sand product can be guaranteed, and a technical path which is low in energy consumption, high in efficiency and capable of giving consideration to the product performance is provided for industrial preparation of the high-purity quartz sand through a sol-gel method.

The invention belongs to the field of photocatalytic material preparation, and particularly relates to a ZnFe2O4 / TiO2 / BC composite material as well as a preparation method and application thereof. The novel photocatalytic material ZnFe2O4 / TiO2 / BC composite material is prepared through a sol-gel method and a coprecipitation method, the photocatalytic performance of titanium dioxide and zinc ferrite is improved, and the application field of titanium dioxide and zinc ferrite is widened. The dopant provided by the invention is relatively low in price, the process is relatively simple, and the photocatalyst with a wider light absorption range can be prepared and can be used for degrading sulfamethoxazole.

The invention provides a preparation method of a metal-based ceramic composite membrane with a catalytic ozone function. The preparation method comprises the following steps: preparing functional powder by taking tetrabutyl titanate as a titanium source and silver nitrate or ferric nitrate as a catalytic active metal source and adopting a sol-gel method; a porous metal pipe is used as a supporting body, metal powder and functional powder which are made of the same material as the supporting body are mixed to prepare functional slurry, the functional slurry is evenly deposited on the inner wall of the supporting body through vacuum filtration, and powder particles which are not firmly combined are removed through back flushing; and finally, the binding force between the functional film layer and the metal matrix is improved through high-temperature heat treatment. Wherein the thermal expansion coefficient difference between the metal supporting body and the functional film layer can be reduced by adding the metal powder, the metal powder is melted and diffused in the high-temperature heat treatment stage, and metallurgical bonding is formed between the functional powder and the metal substrate. The method is simple in process, and the prepared metal-based ceramic composite membrane has the advantages of being high in membrane layer binding force, not prone to falling off, high in catalytic activity, high in anti-pollution capacity, stable in operation and the like.

The invention relates to the technical field of solar cells, in particular to a CZTSSe absorption layer film and a preparation method and application thereof, and the preparation method comprises the following steps: S1, preparing a CZTS precursor solution of a DMF solution system; s2, preparing a CZTS precursor film by adopting a sol-gel method; and S3, coating the CZTS precursor thin film with a NaF solution with the concentration of 0-0.2 mol / L, and then carrying out drying and selenylation treatment to obtain the CZTSSe absorption layer thin film. According to the invention, the CZTS precursor film prepared by using the green and environment-friendly solvent DMF is used for carrying out a NaF solution spin-coating annealing process, so that the improvement of the battery efficiency is successfully realized. The change of CZTSSe film element redistribution, defect chemical environment and grain boundary potential difference after the Na element is doped is avoided.

The invention discloses an anti-oxidation and anti-scouring heat prevention and insulation composite material, a preparation method and application, and belongs to the technical field of high-temperature thermal protection materials. According to the method, a two-step in-situ modification method is adopted, hydrolyzed organosilane reacts with phenolic resin to prepare silicon modified phenolic resin, then the silicon modified phenolic resin is bonded with an organoboron compound to obtain boron-silicon co-modified phenolic resin, a curing agent is added, then the boron-silicon co-modified phenolic resin is injected into a fiber reinforcement mold, and a finished product is obtained through a sol-gel reaction and normal-pressure drying. According to the invention, boron and silicon elements are embedded into phenolic aldehyde molecular chains through covalent bonds to form a boron-silicon-carbon hybrid network, a nano ceramic phase and a compact glassy protective layer are generated at high temperature, and the coating has excellent anti-scouring property, thermal stability and heat insulation property. The preparation process is simple and controllable, is suitable for large-scale production, can accurately regulate and control the performance, and is suitable for thermal protection parts of supersonic aircrafts.

This invention relates to a biomass-based gel electrolyte membrane, its preparation method, and its application. The method includes preparing regenerated cellulose using a sol-gel method, adding sodium alginate and zinc chloride solution, and rapidly constructing a biomass-based composite gel electrolyte with a dual-network structure through metal ion coordination crosslinking. The biomass-based gel electrolyte membrane is obtained by adsorbing an aqueous electrolyte onto a gel membrane with a dual-network structure. This gel electrolyte membrane is then assembled with a zinc anode and a vanadium pentoxide cathode to obtain a zinc-ion battery. This invention features a simple method, readily available and inexpensive raw materials, easy product molding, convenient operation and control, and is conducive to industrial production. The prepared composite gel electrolyte membrane has a dual-network structure, exhibiting good stability, liquid retention capacity, and ionic conductivity, and demonstrates excellent cycle capacity and lifespan when applied to aqueous zinc-ion batteries.

The invention relates to an aerogel-derived ultralow-temperature water-sulfur poisoning-resistant flue gas denitration catalyst and a preparation method thereof, and belongs to the technical field of air pollution control and environment catalytic material frontier. CeMnNiOx composite oxide is used as an active component of the catalyst, a catalyst precursor gel with a three-dimensional network structure is formed through a sol-gel method, and then the hydrophobic aerogel derivative denitration catalyst with a high specific surface area, low density and a three-dimensional porous structure is obtained through aging, freeze drying and high-temperature heat treatment. The denitration efficiency of the catalyst can reach 90% or above at the temperature of 80-270 DEG C in a complex atmosphere containing 5-10% of water vapor and 50-100 ppm of SO2. The method is suitable for deep purification of NOx in ultralow-temperature and high-humidity SO2-containing complex flue gas after industrial desulfurization and dust removal.

The invention discloses an aluminum oxide coated diaphragm and a preparation method thereof in the field of lithium ion battery diaphragms. The diaphragm comprises aluminum oxide particles, a fluorine-containing porous organosilicon compound, a phosphorus heterocyclic covalent organic framework, a binder, a dispersant and deionized water. The fluorine-containing porous organosilicon compound is prepared by mixing methyltrimethoxysilane, perfluorohexyltrimethoxysilane and water, adding ammonia water to adjust the pH value, then reacting to form a sol-gel system, adding amino silane to continue reacting, and then carrying out rotary evaporation, calcination and grinding. The phosphorus heterocycle covalent organic framework is prepared by dissolving cyanuric chloride, triphenylphosphine oxide and anhydrous tetrahydrofuran, adding imidazole bromide to react to form an intermediate, then adding ethylene glycol to continuously react, and performing vacuum drying and grinding to obtain the phosphorus heterocycle covalent organic framework. According to the diaphragm, the interface adhesion and electrolyte wettability are enhanced synergistically through the bifunctional compound, and the thermal stability and the cycle performance are improved.

The invention discloses a preparation method and application of a multifunctional dynamic covalent polymer aerogel material capable of being directly reconstructed. The method comprises the following steps: obtaining a prepolymer with a certain molecular weight by using at least two reaction monomers, completing a sol-gel process by using a compound containing three or more reactive groups as a cross-linking agent, and drying to obtain the dynamic covalent polymer aerogel material. The aerogel material is heated to obtain a polymer solution, a new aerogel material is obtained after cooling, and new dynamic covalent polymer aerogel or aerogel fiber can be prepared in the process by utilizing the sol-gel reversible property; in addition, the aerogel can be placed in an original solvent to be directly reconstructed into new aerogel. According to the method, the problem that traditional aerogel is difficult to reprocess is solved, the material preparation process is simple and economical, the aerogel material can be prepared and reconstructed on a large scale by utilizing a normal-pressure drying technology, and the method is suitable for commercial production.

The invention belongs to the technical field of aerogel, and relates to a method for preparing aerogel by carbon dioxide supercritical drying based on gradient drying control, which comprises the following steps: preparing basic catalytic liquid, preparing silica sol, gelatinizing and aging, performing surface modification, pretreating a drying system, placing and sealing materials, replacing and boosting carbon dioxide, and performing gradient depressurization and material taking. After pressure reduction is completed, aerogel is obtained; by accurately controlling the temperature, the pressure and the pressure increasing and decreasing rate in the carbon dioxide supercritical drying process, skeleton collapse and size shrinkage caused by capillary stress are effectively avoided, and the morphology retentivity and the structural integrity of the aerogel are remarkably improved. The obtained aerogel is light blue and semitransparent, has no cracks on the surface, has the specific surface area of more than or equal to 850m < 2 > / g and the heat conductivity of less than or equal to 0.020 W / (m.K), has excellent heat insulation performance, structural stability and mechanical strength, and is suitable for the fields of building energy conservation, aerospace, microelectronic packaging, flexible heat management and the like.

The invention discloses a process method for preparing aerogel by using gasified slag through a wet process, which realizes high-valued resource utilization of solid wastes, reduces production energy consumption and production cost, and reduces the influence on the environment at the same time. According to the method, the activated silicon-rich waste residues are adopted as raw materials, original crystalline phase silicon in the activated silicon-rich waste residues is converted into active amorphous silicate, the active amorphous silicate can efficiently react with alkali liquor under the low-temperature and normal-pressure conditions to generate a sodium silicate solution, dependence on a high-energy-consumption roasting process is eliminated, energy consumption is reduced by 40% or above, meanwhile, a large number of impurities and metal ions do not exist, and the method is environmentally friendly. The preparation method comprises the following steps: performing alkaline leaching on activated silicon-rich waste residues to obtain a sodium silicate solution which does not need secondary concentration, performing sol-gel reaction, aging reaction, solvent exchange reaction and hydrophobic modification treatment, and finally performing washing and drying to synthesize the hydrophobic silicon dioxide aerogel with high additional value. And the silica aerogel with different densities and specific surface areas is prepared by adjusting parameters such as aging time, aging temperature, modifier concentration and the like.

The invention discloses a doped perovskite catalyst with a noble metal exposed on the surface, a preparation method and application thereof, belongs to the technical field of catalytic materials, and particularly relates to application in catalytic removal of volatile organic compounds. The method comprises the following steps: performing composite molding on rare earth elements / alkaline earth metals, transition metals and noble metals by adopting a sol-gel method, and performing strong acid surface etching and other operations. The surface of the catalyst is provided with a noble metal nanocluster or noble metal nanoparticle structure, so that the surface area is increased, more active sites can be provided, the adsorption of reactant molecules is enhanced, and the conversion rate and selectivity of a catalytic reaction are further improved. Based on the structure and performance advantages, the catalyst disclosed by the invention can be used for efficiently removing volatile organic compounds, can effectively reduce the initial temperature of the catalytic oxidation reaction of the volatile organic compounds, and has a wide application prospect in treating various industrial processes needing high-temperature and efficient catalysis.

The invention discloses a method for preparing high-toughness silicon nitride ceramic from Si3N4 and multi-element rare earth additive core-shell structure powder, multi-element rare earth nitrate, tetraethoxysilane and Si3N4 powder are used as main raw materials, elements of a multi-element rare earth sintering additive system are uniformly distributed through a sol-gel method, and silicon nitride particles are uniformly coated, so that the high-toughness silicon nitride ceramic is prepared. A uniform liquid phase can be provided for dominant development of silicon nitride crystal grains, so that full development of double-peak morphology of the silicon nitride crystal grains is promoted, and the bending strength and fracture toughness of the silicon nitride ceramic are improved.

The invention relates to the field of textiles, and particularly discloses a preparation process of antibacterial fibers, which comprises the following steps: S1, respectively drying and preparing polymer slices and an antibacterial agent; s2, performing melt spinning on the polymer slices and an antibacterial agent, performing air cooling, and then performing traction and winding to obtain antibacterial fibers; wherein the antibacterial agent is prepared by mixing dodecyl trimethyl ammonium chloride, polyvinylpyrrolidone and core-shell type antibacterial particles according to the mass ratio of (0.4-0.5): (0.1-0.2): 1, the core-shell type antibacterial particles are prepared by loading nano-zinc oxide and nano-silver particles on intercalation modified montmorillonite and then forming a silicon dioxide coating layer through a sol-gel method, and the core-shell type antibacterial particles are prepared from the silicon dioxide coating layer through a sol-gel method. And carrying out spray drying to obtain the core-shell antibacterial particles. The preparation method has the characteristic of improving the antibacterial durability and uniformity of the antibacterial fiber.

The invention discloses a preparation method of an iron-doped cerium-based perovskite type high-selectivity Cu ion capture stabilizing agent and application of the stabilizing agent in heavy metal pollution remediation, and the stabilizing agent is prepared through a sol-gel method and comprises the steps that cerous nitrate and citric acid are dissolved in water, and the mixture is heated and stirred to be gel-shaped; standing the gel solution in a drying oven at a constant temperature to obtain a Fe-Ce-PVSK precursor; grinding the precursor into powder, putting the powder into a quartz boat, and calcining in an air atmosphere through a horizontal tube furnace to obtain a product; and finally, washing to be neutral to obtain the iron-doped cerium-based perovskite stabilizing agent. Due to the high oxygen vacancy concentration and rich active sites, the stabilizing agent has high selectivity and high adsorption capacity and has specific capturing capacity on Cu < 2 + >. The preparation method has mild reaction conditions. The stabilizing agent can effectively reduce the bio-availability of heavy metals in a polluted matrix, promote healthy growth of plants, and realize pollution restoration and ecological function recovery at the same time.

The invention discloses a coal mine return air corner CO purification method based on catalytic oxidation, and relates to the technical field of coal mine return air corner CO purification, the coal mine return air corner CO purification method comprises the following steps: mixing manganese salt, cerium salt and a complexing agent by adopting a sol-gel coprecipitation method, stirring to form sol, and sequentially drying and calcining at high temperature to prepare a Mn-Ce-O composite oxide catalyst precursor; loading the Mn-Ce-O composite oxide catalyst precursor on a mesoporous carbon carrier subjected to hydrophobic modification treatment through an impregnation method, and carrying out drying and inert atmosphere heat treatment to obtain the low-temperature adaptive composite catalyst with an oxygen vacancy structure and moisture resistance, forming the low-temperature adaptive composite catalyst into a regular structure unit, filling the regular structure unit into a front end area of a reactor to form a first catalyst layer, filling a downstream area of the reactor with a thermal stability catalyst to form a second catalyst layer, and forming a catalytic reaction structure with an activity gradient along an airflow direction; the catalytic reaction structure with the activity gradient is integrated in a modular shell.

The invention relates to the technical field of preparation of new materials and composite materials, and discloses a ceramifiable aramid nanofiber reinforced phenolic aerogel composite material and a preparation method thereof, the composite material is prepared from a hybrid aramid nanofiber preform and a matrix phenolic resin; wherein the preform is prepared by mixing aramid nano-fiber slurry, a silane coupling agent, a transition metal precursor and water-soluble phenolic resin and freeze-drying the mixture. The preparation method comprises the following steps: dipping a preform into a matrix phenolic resin solution, carrying out sol-gel reaction and drying to obtain the composite material, and further carrying out high-temperature carbonization treatment. Through a multi-scale synergistic enhancement strategy, the silane coupling agent is utilized to reinforce interface bonding, and the transition metal precursor is utilized to realize high-temperature in-situ ceramization, so that the mechanical strength, the structural integrity and the ablation-resistant thermal protection performance of the composite material are improved, and the problems of high brittleness and easy pulverization of the traditional phenolic aerogel are solved.

The invention discloses an anti-aging bronze powder pigment and a preparation method and application thereof in the technical field of bronze powder pigments, and the anti-aging bronze powder pigment takes copper-zinc alloy as a base material, and is sequentially connected with a composite chemical passivation layer, a functionalized organic-inorganic hybrid compact barrier layer and a surface super-hydrophobic layer through chemical bonding from inside to outside; wherein the composite chemical passivation layer is formed by treating a passivation solution containing phytic acid, ammonium metavanadate and sodium tungstate; the functionalized organic-inorganic hybrid compact barrier layer is constructed by a silane mixed solution containing 3-mercaptopropyltriethoxysilane, a reaction type ultraviolet light absorber Si-BP, a reaction type hindered amine light stabilizer Si-HALS and tetraethyl orthosilicate through a sol-gel process. Through the design of a multi-layer composite system, the aging resistance of the bronze powder is improved, and meanwhile, the optical decoration performance can be reserved to the maximum extent, so that the dual strict requirements of high-end outdoor applications such as automobile coatings on durability and visual texture can be met.

The application discloses an amorphous silicon dioxide coating prepared based on micro-arc oxidation, a preparation method and application thereof, and belongs to the technical field of metal surface protection and silicon dioxide coating. In the application, a magnesium alloy, an aluminum alloy, a titanium alloy, a titanium-aluminum base and a nickel-aluminum base are used as anodes and are placed in a micro-arc oxidation tank, a hydrolytic solution of organic silicon is used as an electrolyte, and an amorphous silicon dioxide coating with a thickness of more than 100 mu m can be prepared within 20 minutes through a step-by-step step-incremental constant potential control means. The application utilizes the advantages of the micro-arc oxidation process and the sol-gel process, avoids their shortcomings, and realizes the superimposed synergistic effect of "1+1>2". The process steps of the application are simple, and the application is very suitable for full-automatic operation and processing in industry. The amorphous silicon dioxide coating with the required thickness, wear resistance, corrosion resistance, erosion resistance, oxidation resistance and other characteristics can be prepared by changing the electrolyte concentration, the micro-arc oxidation time and the electric control parameters, or through the conventional micro-arc oxidation constant voltage and constant current control means.

The invention relates to lead-free glass-coated copper powder for an HJT photovoltaic cell, conductive copper paste and a preparation method of the lead-free glass-coated copper powder and the conductive copper paste, the glass-coated copper powder comprises nano-copper powder and a coating layer on the surface of the nano-copper powder, and the coating layer is composed of bismuthate glass. According to the preparation method, a sol-gel method is adopted, the bismuthate glass is coated on the nano copper powder, the glass and the copper powder form a core-shell structure, the glass can be molten into a liquid phase during sintering, the contact between the glass and the copper powder is more uniform, and the oxidation resistance of the copper powder is enhanced. The prepared glass-coated copper powder can effectively isolate the copper powder from being in contact with an external oxidizing agent, excellent anti-oxidation protection is provided, the rapid oxidation point of the copper powder is increased by 100-150 DEG C compared with the rapid oxidation point of the copper powder before coating, and the service life of the copper powder is prolonged; meanwhile, the conductive copper paste has high stability, high reliability, low cost and high conductivity, and meets the environmental protection requirement.

The invention discloses a high-entropy ferric pyrophosphate sodium ion battery positive electrode material and a preparation method thereof, and belongs to the field of battery positive electrode materials. The chemical formula of the positive electrode material is Na4Fe3-aMa (PO4) 2P2O7 (0.05 < = a < = 0.5), M is a metal element and comprises at least five of cobalt, magnesium, zirconium, zinc, aluminum, molybdenum, copper, manganese, nickel, calcium and chromium, the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is spherical, and the surface of the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is coated with an amorphous carbon layer. The preparation method adopts a sol-gel method and comprises the following steps: mixing an iron source, a doped metal source, sodium pyrophosphate, ammonium dihydrogen phosphate and citric acid monohydrate according to a stoichiometric ratio, stirring, gelatinizing and drying to obtain xerogel, and calcining through a two-stage hydrogen-argon mixed gas to obtain the iron-doped metal-doped sodium pyrophosphate / citric acid composite material. The crystal structure is optimized by means of the high-entropy synergistic effect, the electron conductivity and the Na < + > diffusion rate are improved, and the industrial adaptability of the spherical morphology and the structural stability of carbon coating are combined.

The invention relates to the field of composite materials, and discloses a ceramic fiber reinforced composite aerogel material and a preparation method thereof.The ceramic fiber reinforced composite aerogel material is prepared from ceramic fibers, fumed silica, an aerogel precursor, modified aerogel powder and other raw materials through a sol-gel combined special drying technology; the flame-retardant fireproof coating is formed by spraying and curing slurry prepared from potassium silicate, silicone acrylic emulsion, modified ammonium polyphosphate, pentaerythritol, aluminum hydroxide, expanded vermiculite and fumed silica, and modified aerogel powder is prepared by dipping a silicon dioxide precursor solution into reduced graphene oxide aerogel; the modified ammonium polyphosphate is prepared by synergistically assembling activated ammonium polyphosphate and chitosan, combining with mercaptopropyltrimethoxysilane and then grafting octavinyl-POSS (Polyhedral Oligomeric Silsesquioxane). The prepared ceramic fiber reinforced aerogel material has the characteristics of high temperature resistance, light weight and high strength; the flame-retardant fireproof coating improves the antifouling self-cleaning effect, the fire endurance and the heat insulation performance of the material.

The invention discloses a modified PVC (polyvinyl chloride) particle and a preparation method thereof in the field of high polymer material modification, the modified PVC particle takes PVC resin as a matrix, and two brand new modifiers, namely a silicon-boron-nitrogen hybrid epoxy nanosphere and epoxidized soybean oil-maleic anhydride-2-ethylhexyl acrylate random copolymer, and other auxiliaries are added. The silicon-boron-nitrogen hybrid epoxy nanospheres are prepared by the following steps: hydrolyzing tetraethoxysilane and triethyl borate in absolute ethyl alcohol to generate a silicon-boron alcohol intermediate, then carrying out sol-gel reaction on the silicon-boron alcohol intermediate and glycidyl methacrylate to form a hybrid network containing an epoxy group, and finally carrying out ultrasonic dispersion. The epoxidized soybean oil-maleic anhydride-2-ethylhexyl acrylate random copolymer is prepared by carrying out ring opening on epoxidized soybean oil and peracetic acid to generate epoxidized soybean oil acrylate, and then carrying out free radical copolymerization reaction on the epoxidized soybean oil acrylate, maleic anhydride and 2-ethylhexyl acrylate. The method is suitable for the fields of high-end building materials, automotive interiors and the like.

The invention belongs to the field of aerogel composite materials, and discloses a heat insulation and wave absorption integrated aerogel composite material which at least has a three-stage pore network structure, the secondary structure is a continuous carbon network and is loaded in pores of the primary structure; the tertiary structure is silicon oxide aerogel with nano pores, and is polymerized on the surface of the secondary structure and in the pores in situ. The aerogel composite material is low in heat conductivity coefficient, good in heat insulation performance, excellent in wave absorbing performance and high in mechanical strength. The invention further discloses a preparation method of the material, the carbon-silicon dioxide composite material prepared through sol-gel and supercritical fluid drying is low in aerogel density and small in pore diameter and has a good barrier effect on solid heat transfer and gas heat transfer, and the prepared composite material has low heat conductivity and good heat conductivity. The continuous carbon network endows the material with excellent wave-absorbing performance.

The invention belongs to the technical field of ceramic fiber composite material preparation, and provides a ceramic fiber aerogel felt and a preparation method thereof. A ceramic fiber felt is used as a framework, basic sol is prepared through a sol-gel method, and three additives are introduced: the first additive is a borosilicate oligomer solution used for forming a high-temperature-resistant borosilicate network in a final material; the second one is a Ti-POSS solution which is used as an in-situ precursor of a high-temperature infrared opacifying agent and is used for inhibiting radiation heat transfer of the material at high temperature; the third solution is a phosphazene siloxane solution, so that the material is endowed with intrinsic flame retardance and flexibility; then, functional conversion and ceramization processes are completed through solvent replacement, surface hydrophobic modification, normal-pressure drying and heat treatment, and the obtained ceramic fiber aerogel felt has excellent heat insulation performance and high-temperature structural stability and has important application value in the field of thermal safety protection of high-end power batteries.

The invention discloses a hydrogenated butadiene-acrylonitrile rubber composite material for cryogenic heat preservation and a preparation method thereof in the field of polymer composite materials, and the composite material is characterized in that zirconium-silicon composite modified hydroxyapatite and boron-nitrogen co-doped mesoporous alumina are introduced, so that the mechanical property and heat preservation effect of the material in a low-temperature environment are remarkably improved. The zirconium-silicon oxide network is constructed on the surface of hydroxyapatite by adopting a sol-gel method, and the doped mesoporous structure with the high specific surface area is obtained by adopting alkoxide as a precursor through hydrothermal treatment and calcination. When the rubber is mixed, the functional filler is dispersed at a high temperature, and then the plasticizer is added to ensure uniform distribution of the filler. The obtained composite material has excellent tensile strength, elongation at break and low heat conductivity coefficient at the liquid nitrogen temperature, and is suitable for the cryogenic thermal insulation fields of hydrogen energy storage and transportation, aerospace sealing and the like. All the raw materials are commercially available chemicals, the process is controllable, and industrial production is easy.

The invention discloses a monovalent alkali metal ion doped iron-based perovskite type ceramic membrane as well as a preparation method and application thereof, and belongs to the technical field of mixed conductor oxygen permeation ceramic membrane materials. The method comprises the following steps: (1) synthesizing layered rock salt oxide M1 by adopting an EDTA-CA (Ethylene Diamine Tetraacetic Acid-Carboxylic Acid) sol-gel method; (2) mixing the M1 with other metal carbonate or oxide according to the stoichiometric ratio of the target perovskite oxide M2, and preparing a solid precursor M1 + M2 through a solid-phase reaction method; and (3) sintering the precursor into a compact ceramic membrane by using a static pressure-roasting method. According to the invention, the problem that monovalent alkali metal ions are easy to volatilize in a high-temperature solid-phase reaction is effectively solved through a process of stabilizing the alkali metal at a low temperature and then forming a film at a high temperature, and the monovalent alkali metal ions are successfully doped into iron-based perovskite crystal lattices. The prepared ceramic membrane has the advantages that the oxygen permeation flux is obviously improved while the good structural stability is maintained, and the ceramic membrane is particularly suitable for oxygen separation in an oxygen-enriched combustion process.

The invention discloses a water-resistant molybdenum disulfide additive for lubricating grease, and belongs to the technical field of lubricating materials. The water-resistant molybdenum disulfide additive for the lubricating grease is hydrophobic mesoporous silica composite molybdenum disulfide, and a preparation method of the water-resistant molybdenum disulfide additive comprises the following steps: firstly, generating nano mesoporous silica on the surface of a molybdenum disulfide nanosheet in situ through a sol-gel method, namely, forming mesoporous silica composite molybdenum disulfide; then carrying out oleic acid modification on the mesoporous silica composite molybdenum disulfide to obtain hydrophobic mesoporous silica composite molybdenum disulfide; compared with a mixture of molybdenum disulfide, mesoporous silica and molybdenum disulfide, the hydrophobic mesoporous silica composite molybdenum disulfide is added into the composite calcium sulfonate-based lubricating grease, so that the temperature resistance, water spray resistance, extreme pressure property and lubricating property of the composite calcium sulfonate-based lubricating grease can be remarkably improved.

This invention provides an LLATO@ferroelectric phase NBTO solid electrolyte material, its preparation method, and its application, belonging to the field of lithium-ion solid electrolyte technology. This invention employs a sol-gel method for mixing and calcination to synthesize NBTO ferroelectric phase-coated LLATO lithium-ion conductors (Li). 0.33 La 0.457 Ag 0.1 TiO3@ x wt% Na 0.5 Bi 0.5 TiO3 (0< x ≤6). The LLATO@ferroelectric phase NBTO solid electrolyte material of the present invention exhibits excellent comprehensive performance, with a room temperature ionic conductivity of σ=1.08×10⁻⁶. ‑3 S / cm, relative to the room temperature ionic conductivity of the uncoated LLATO solid electrolyte (1.54 × 10⁻⁶). ‑4 The voltage (S / cm) is improved by an order of magnitude. In lithium symmetric battery tests, it maintains stable cycling after 2000 charge-discharge cycles at 0.1 mA and maintains stable voltage output at 1 mA.