1617 results about "Fluoride" patented technology

The invention discloses a corrosion-resistant protective sleeve for an aluminum alloy cable and a preparation method of the corrosion-resistant protective sleeve, and belongs to the field of cable protective sleeves. The corrosion-resistant protective sleeve for the aluminum alloy cable is prepared from the following raw materials in parts by mass: 40 to 50 parts of ethylene propylene diene monomer, 15 to 25 parts of fluorinated silicone rubber, 5 to 10 parts of modified thiolated ethylene-vinyl alcohol copolymer, 8 to 15 parts of metal fluoride nanocrystal, 4 to 8 parts of vulcanizing agent, 3 to 8 parts of plasticizer and 3 to 5 parts of flame retardant. The two rubber matrixes are compounded to form a physical barrier layer to prevent corrosion media and water molecules from permeating, material pores can be filled with the metal fluoride nanocrystals, diffusion channels of the corrosion media are reduced, and hydrophobicity and corrosion resistance are improved through cooperation of the metal fluoride nanocrystals and the fluorinated silicone rubber. The modified thiolated ethylene-vinyl alcohol copolymer can improve the compatibility between rubber matrixes and form coordination with metal ions of the metal fluoride nanocrystals, so that the diffusion path of a corrosive medium is prolonged, and the corrosion of the corrosive medium is synergistically blocked.

The invention discloses a tooth repair composition containing mesoporous hydroxyapatite, a tooth repair product and a preparation method and application of the tooth repair composition and the tooth repair product. The tooth repair composition comprises nano-hydroxyapatite, fluoride and a chelating agent, the logarithm value logK of the stability constant K of the chelating agent to calcium ions is 1 < = logK < = 5, and K is measured in an aqueous solution with the temperature of 25 DEG C, the pH value of 7.0 and the ionic strength of 0.1 M; the nano-hydroxyapatite is prepared from nano-scale mesoporous hydroxyapatite, and the nano-hydroxyapatite contains nano-scale mesoporous hydroxyapatite. By adding the specific chelating agent, dynamic balance is formed in the tooth repairing composition, slow release protection can be formed on free calcium ions, the double inactivation effect possibly occurring when hydroxyapatite and fluoride exist at the same time is effectively avoided, the synergistic repairing effect of hydroxyapatite and fluoride is fully exerted, and the tooth repairing effect is improved. The use of fluorides can be greatly reduced, and safety and reliability are achieved.

The invention discloses a method for preparing an ultrahigh-temperature ceramic coating by an ultrahigh-temperature metal gas source based on a molten salt medium, which comprises the following steps of: mixing low-melting-point salt A, metal fluoride and metal M to obtain a mixture C, putting the mixture C into a first crucible, mixing low-melting-point salt B and metal M to obtain a mixture D, putting the mixture D into a second crucible, putting a carbon base material into a deposition furnace, and performing vacuum drying to obtain the ultrahigh-temperature ceramic coating. Heating the first crucible to melt the mixture C to obtain a melt E, and heating the second crucible to melt the mixture D to obtain a melt F; carrier gas is guided into the first crucible, the carrier gas flow passes through the melt E to form gas flow containing a metal gas source, the gas flow containing the metal gas source is guided into the second crucible, and the gas flow containing the metal gas source is filtered by the melt F in the second crucible to form a pure metal reaction gas source, and finally, a pure metal reaction gas source is introduced into the deposition furnace for deposition of the carbon base material, and the ultra-high-temperature ceramic coating is obtained. The method is easy to operate and low in cost.

The invention discloses a fluoride-salt-free and nitrate-free cast iron enamel zirconium white glaze as well as a preparation method and application thereof, and belongs to the technical field of enamel. The zirconium white glaze is prepared from quartz, borax pentahydrate, magnesium carbonate, potassium carbonate, potassium feldspar, zinc oxide, aluminum hydroxide, calcium carbonate, zirconium silicate, sodium tripolyphosphate and lithium carbonate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The zirconium white glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, and meanwhile, the zirconium white glaze has good porcelain surface, luster and firing adaptability, is suitable for cast iron matrixes, has the firing temperature of 740-760 DEG C and the firing time of 87-87 hours, and can be widely applied to cast iron substrates. The method can be used for producing green and environment-friendly enamel products.

The invention belongs to the technical field of industrial solid waste resource recycling, and discloses a nano composite filling material based on in-situ acid-base mutual modification enhancement and application thereof. According to the nano composite filling material, the alkalinity of the red mud and the acidity of the desulfurized gypsum are used for neutralization, the alkalinity of a system is reduced, a synergistic reaction is excited, a large number of ettringite crystals playing a key enhancing role are generated under the regulation and control of a nano material, and the ettringite crystals and a geopolymer form an interpenetrating network structure. The obtained slurry is low-viscosity and high-fluidity Newtonian fluid (diffusivity gt and 250 mm), the 7-day strength is larger than 2.0 MPa, the pH value is 7-9, and the fluorine ion concentration is lt; and the leaching of heavy metal ions is qualified, and the method is environment-friendly and safe. Efficient resource utilization of the red mud and the desulfurized gypsum is achieved, and the method is simple in process, low in cost and especially suitable for mine filling and engineering backfilling.

The invention discloses fluoride-salt-free and nitrate-free low-temperature pearlescent glaze for steel plate enamel as well as a preparation method and application of the pearlescent glaze, and belongs to the technical field of enamel. The pearlescent glaze is prepared from quartz, anhydrous borax, titanium dioxide, magnesium carbonate, sodium tripolyphosphate, potassium carbonate, lithium carbonate, potassium feldspar, zinc oxide and V-26 according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The pearlescent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the pearlescent glaze has good porcelain surface, luster and low-temperature firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 760-800 DEG C and the firing time of 10-20 minutes, and is suitable for a steel plate. The method can be used for producing green and environment-friendly enamel products.

The invention discloses a fluorine-containing organic matter wastewater treatment method, which comprises: S1, concentrating the fluorine-containing organic matter content in wastewater from 0.01-0.3 wt% to 0.3-3 wt% to obtain primary concentrated wastewater; s2, carrying out centrifugal separation by adopting hydrophilic varnished cloth, and further concentrating the content of fluorine-containing organic matters in the primary concentrated wastewater to 10-30wt% to obtain high-concentration concentrated wastewater; s3, performing high-temperature plasma cracking and incineration on the high-concentration concentrated wastewater in a plasma cracking and incineration furnace; and S4, tail gas discharged after incineration is cooled and absorbed by alkali liquor, inorganic fluoride in the tail gas is recycled, and then the tail gas is discharged. According to the treatment method, the technical bottleneck that the low-concentration fluorine-containing organic matter wastewater is difficult to directly treat by an existing plasma incineration technology is solved, operation is easy and convenient, the treatment efficiency is high, environment friendliness is achieved, and an innovative technical path is provided for harmless treatment of the low-concentration fluorine-containing organic matter wastewater and high-added-value resource recycling.

An article has a body having a protective coating. The protective coating is a thin film that includes a metal oxy-fluoride. The metal oxy-fluoride has an empirical formula of MxOyFz, where M is a metal, y has a value of 0.1 to 1.9 times a value of x and z has a value of 0.1 to 3.9 times the value of x. The protective coating has a thickness of 1 to 30 microns and a porosity of less than 0.1%.

This application belongs to the field of luminescent materials technology, and particularly relates to a Mn 4+ Activated high-entropy fluoride red luminescent materials, their preparation methods, and applications. Including materials with the molecular formula A2X. 1‑y F6:yMn 4+ BX 1‑ y F6:yMn 4+ C3X 1‑y F6:yMn 4+ D2X 1‑y F7:yMn 4+ At least one luminescent material, wherein the A-site, C-site, and D-site are each independently selected from NH4. + Li + Na + K + 、Rb + Cs + (CH3)4N + At least one of the following: B site is selected from Ba and / or Zn; each luminescent material contains at least four metal elements at the X site, with the molar ratio of each metal element ranging from 5% to 35%, and y in each luminescent material independently satisfies 0 < y < 0.5. Through compositional design, the high-entropy fluoride matrix exhibits high disorder and large lattice distortion, which is Mn 4+ It provides a low-symmetry lattice environment, enhances radiative transitions, and significantly improves the luminescence efficiency and optical performance of various luminescent materials.

The invention relates to a high-temperature acidolysis reaction defluorination method, and belongs to the technical field of phosphorus chemical resource recycling. The technical problem to be solved by the invention is to provide a high-temperature acidolysis reaction defluorination method which is simple to operate and high in defluorination rate. According to the method, phosphorite powder / white fertilizer is subjected to high-temperature acidolysis, fluoride in the phosphorite powder / white fertilizer reacts with strong acid, fluorine is separated from a reaction system in a gas form, and hydrofluoric acid is obtained through condensation. The method is simple, is simple and convenient to operate, and is easy to realize technologized large-scale production. Meanwhile, due to the destructive effect of the strong acid on the lattice structure of the phosphorus-calcium compound, citrate-soluble phosphorus can be converted into soluble phosphate, subsequent phosphorus recovery is facilitated, comprehensive utilization of phosphorite and elimination of white fertilizer output are achieved, meanwhile, the problems of material accumulation and resource waste of enterprises are solved, and the method conforms to the circular economy concept of green development.

Provided is a composite active material that is capable of more suppressing deterioration of an active material caused by the moisture of the composite active material than a conventional composite active material by increasing a permissible water content of a layer of the composite active material. The composite active material that is used for solid-state batteries includes: an active material; a first coat layer that contains a fluoride-containing first solid electrolyte, the first coat layer coating at least part of a surface of the active material; and a second coat layer that contains a sulfide-containing second solid electrolyte, and a solvent, the second coat layer coating at least part of the first coat layer, wherein a water content of the composite active material at 200° C. measures at most 823 ppm on a Karl Fischer titrator.

The invention provides a positive electrode active material and a preparation method thereof, a positive plate and a battery. An inner slow-release layer in the positive electrode active material coats at least part of the surface of a positive electrode active material main body, and an outer inhibition layer coats at least part of the surface of the inner slow-release layer; the inner slow-release layer comprises lithium carbonate and M metal oxide, and the outer inhibition layer comprises at least one of nitride, fluoride and oxide of inhibition elements; the inhibiting elements comprise at least two elements in VA, IVA family, IIIA family, IIA family and IVB family. The lithium carbonate in the inner slow-release layer can release non-flammable gas mainly containing CO2, the metal oxide can inhibit release of lattice oxygen in the positive electrode active material main body at high temperature, and the proportion of combustible gas is reduced. The lithium carbonate is provided with a temperature decomposition window, so that the release time of carbon dioxide pressure relief for the first time can be accurately controlled. And the outer inhibition layer can avoid the contact between the positive electrode active material main body and the electrolyte, so that the proportion of the combustible gas is further reduced.

The invention belongs to the technical field of new energy, and particularly relates to a dual-coated ternary positive electrode material as well as a preparation method and application thereof. The dual-coated ternary positive electrode material comprises an inner core, and a first coating layer and a second coating layer which are sequentially attached to the surface of the inner core, the inner core has the following composition LiNixCoyMnzMaO2, x is more than or equal to 0.30 and less than or equal to 0.80, y is more than or equal to 0.10 and less than or equal to 0.30, z is more than or equal to 0.10 and less than or equal to 0.30, x + y + z = 1, a is more than or equal to 0.005 and less than or equal to 0.050, and M comprises at least one of metal elements of group IIIA, group IIA and group IVB; the first coating layer is made of an M metal oxide; the second coating layer is made of carbon and metal fluoride; the double-coated ternary positive electrode material has excellent rate capability and cycling stability.

The invention provides an impurity and oil removal method for a laterite-nickel ore hydrometallurgy filter stick. The impurity and oil removal method comprises the following steps: dynamically cleaning a to-be-treated filter stick by adopting a first cleaning solution so as to remove oil stains on the surface of the filter stick; the first cleaning solution comprises an alkaline reagent and a surfactant; dynamically cleaning the oil-removed filter stick by adopting a second cleaning solution so as to remove metal impurities on the surface of the filter stick; the second cleaning solution comprises an acidic reagent and fluoride. According to the method, a step-by-step strategy of oil removal and impurity removal is adopted, the alkaline reagent and the surfactant cooperate with each other, oil stains on the surface of the filter stick can be efficiently stripped, and a channel is opened for subsequent impurity removal; the acidic reagent and the fluoride cooperate with each other, nickel, cobalt, lead and other impurities on the surface of the filter stick can be efficiently removed, fluorine ions and the metal ions can form a water-soluble complex, the problem of impurity metal residues is thoroughly solved, and deep regeneration of the filter stick is achieved. The strategy is excellent in oil and impurity removal effect and regeneration performance.

The invention relates to the technical field of aluminum oxide preparation, in particular to a method for preparing flaky aluminum oxide by using electrolyte waste liquid and flaky aluminum oxide. The method comprises the following steps: carrying out carbonation reaction on the electrolyte waste liquid by using carbon dioxide to obtain aluminum hydroxide precipitate; washing the aluminum hydroxide precipitate for the first time by using a washing agent to obtain a washed aluminum hydroxide solid-phase substance with a preset sodium content; calcining the washed aluminum hydroxide solid-phase substance to obtain a gamma-type aluminum oxide precursor; carrying out molten salt reaction on the composite molten salt system and the gamma-type aluminum oxide precursor to obtain a flaky aluminum oxide crude product; wherein the composite molten salt system is a mixture of sodium chloride, potassium chloride and sodium sulfate; and carrying out secondary washing on the sheet-shaped aluminum oxide crude product to obtain a sheet-shaped aluminum oxide product. According to the method, the flaky alumina with the high radius-thickness ratio is prepared under fluoride-free and strong acid conditions through a three-step core strategy of resource utilization of waste electrolyte, accurate sodium content control and directional induction of composite molten salt.

The invention provides a scintillator film for a real-time X-ray dosimeter as well as a preparation method and application of the scintillator film. The preparation method comprises the following steps: weighing Eu (NO3) 3.6 H2O, Tb (NO3) 36H2O, Lu (NO3) 36H2O, NaF and NH4F to prepare powder B; preparing a rare earth fluoride material C from the powder B; weighing a polydimethylsiloxane prepolymer and a curing agent, adding the polydimethylsiloxane prepolymer and the curing agent into a cyclohexane solution, and performing ultrasonic dispersion to obtain a mixture D; adding the rare earth fluoride material C and PMMA particles into an ethanol solution, and uniformly dispersing to obtain a mixture E; dropwise adding the mixture E into the stirred mixture D, and performing vacuum mixing to obtain a mixture F; and transferring the mixture F to the surface of a ceramic plate which is respectively cleaned by water, ethanol and acetone and dried, coating to form a thin film, heating and annealing, and cooling to obtain the flexible scintillator thin film NaLuF4: Tb < 3 + > / Eu < 3 + > coated PDMS which is used for a real-time X-ray dosimeter.

The invention relates to the technical field of wastewater treatment, in particular to a multi-stage treatment method and system for lead smelting wastewater. The method comprises the following steps: acquiring water quality data of the multi-source lead-acid storage battery smelting wastewater, and based on the water quality data, analyzing to obtain a battery wastewater multiphase feature set; on the basis, the information of the stabilized intermediate water body is obtained by dynamically adjusting the hydrogen ion concentration, breaking a complexing structure and preferentially separating fluoride; on the basis, the antimony valence state and the antimony concentration are monitored in real time, the oxidizing agent type and the reaction intensity are matched in a self-adaptive mode, oriented efficient conversion of antimony is achieved, and low-antimony pre-sedimentation water outlet information is obtained; on the basis, according to the dynamic proportion of the inlet water hydrogen ion concentration to the lead and antimony ions, a precipitation path control instruction is automatically switched, a purified water body with lead and antimony synchronously and deeply removed is obtained, and a lead smelting wastewater multi-stage treatment log is output. Harmful pollutants in the lead smelting wastewater process are efficiently removed, the method adapts to water quality fluctuation, consumption reduction and cost saving are achieved, compliance treatment of wastewater is achieved, and environment-friendly and economic values are achieved.

The invention discloses an anti-doodling superhard heat-insulating coating as well as a preparation method and application thereof, and relates to the technical field of heat-insulating coatings. The preparation method comprises the following steps: preparing ladder-type polysilsesquioxane from epoxy siloxane, then taking the ladder-type polysilsesquioxane and 2, 5-bis (trifluoromethyl)-3, 6-dioxaundecafluorononanoyl fluoride as raw materials, and successfully synthesizing fluorinated ladder-type polysilsesquioxane through chemical grafting of a fluorine-containing oligomer and the ladder-type polysilsesquioxane, so as to obtain the fluorinated ladder-type polysilsesquioxane. The preparation method comprises the following steps: preparing a fluorinated trapezoid polysilsesquioxane coating, mixing the fluorinated trapezoid polysilsesquioxane coating with a triaryl sulfonium hexafluoroantimonate mixture to prepare a fluorinated trapezoid polysilsesquioxane coating, and sequentially spin-coating a CWO coating and the fluorinated trapezoid polysilsesquioxane coating on a substrate for curing to obtain the anti-doodling superhard heat-insulating coating. The prepared anti-doodling superhard heat insulation coating has excellent anti-doodling performance, high hardness, good heat insulation effect and use stability, can be used for manufacturing energy-saving windows to prolong the service life of the energy-saving windows, and has important scientific research value and commercial application value.

The utility model discloses a high-water-resistance metal composite backboard which comprises a water-resistance layer, two sides of the water-resistance layer are respectively bonded with an insulating layer through a glue layer, and the outer side of the insulating layer is provided with a coating. The utility model also discloses a photovoltaic assembly. According to the utility model, the waterproof layer is made of the metal material with low water permeability and can effectively prevent water vapor from invading, and the two sides of the waterproof layer are respectively bonded with the insulating layers through the glue layers, so that the insulation treatment of the waterproof layer is realized, and the situation of electric leakage is avoided; according to the utility model, the functional coating is arranged, for example, the coating is made of a mixture of fluoride and an anti-ultraviolet additive, so that the weather resistance of the composite backboard body can be improved, and different pigments can be added according to the requirements of the photovoltaic module body on colors, so that the appearance of the composite backboard body is diversified.

The invention discloses a fluorine ion stabilizer, a lithium carbon fluoride battery electrolyte and a lithium carbon fluoride battery, and belongs to the field of lithium batteries. The fluorine ion stabilizer is prepared from a 1-ethyl-3-methylimidazole cation compound and an alcohol compound; the alcohol compound is selected from at least one of ethylene glycol and polyethylene glycol; the molecular weight of the polyethylene glycol is 62 to 3000. The binding energy of the fluorine ion stabilizer and fluorine ions is low, a solvation product can be stabilized, the final discharge product of the Li / CFx battery is changed, and finally the purpose of reducing the heat produced in the discharge process of the battery is achieved.

The invention provides a three-dimensional lithium battery mine visualization system based on digital twinning, and the system comprises a physical sensing layer which is disposed at a lithium battery mine site, and comprises a plurality of sensor networks used for collecting geologic bodies, production equipment, environment parameters, personnel positions, and vehicle states; and the data interaction layer comprises a data integration platform and an edge computing node, and is used for carrying out cleaning, fusion, protocol conversion and edge side preliminary analysis on the multi-source heterogeneous data uploaded by the physical sensing layer, and uploading the multi-source heterogeneous data to a cloud. By integrating the slope monitoring sensor and the professional analysis model, real-time evaluation and advanced early warning of the slope stability and the tailing pond safety are achieved, major accidents such as collapse and dam break are effectively prevented, meanwhile, the harmful element diffusion model is utilized, and the safety of the tailing pond is improved. Migration paths of fluoride dust, radioactive substances and potential leakage pollutants in the atmosphere and the water system are dynamically simulated, accurate decision support is provided for environmental risk emergency response, and the influence on surrounding ecology is reduced to the maximum extent.

A method of coating an article for a process chamber is provided. The method includes performing an ion assisted deposition (IAD) using a dual source include a first source and a second source to deposit a protective layer on at least one surface of the article. The first source includes a metal oxide and the second source includes a metal fluoride. When the IAD is performed, a ratio of the metal oxide to the metal fluoride is controlled, such that a gradient in fluoride content between a bottom of the protective layer and the top of the protective layer occurs.

The application belongs to the field of fine chemical industry and environmental protection, and particularly relates to a method for preparing metal triflate by using high gravity reaction. The method comprises the following steps: 1, using trifluoromethylsulfonyl chloride and anhydrous HF gas as raw materials to generate trifluoromethylsulfonyl fluoride gas; 2, performing gas-liquid contact reaction of the trifluoromethylsulfonyl fluoride gas with an alkali metal solution to obtain a mixed solution; 3, performing solid-liquid separation on the mixed solution by using a filter press, and the liquid phase is a triflate salt solution; 4, drying the triflate salt solution by using a spray dryer to obtain a solid-phase product triflate salt. The method uses trifluoromethylsulfonyl chloride and anhydrous HF as raw materials to replace triflic acid in the traditional method, and utilizes high gravity reaction, so that the production cost is greatly reduced. The process is simple, the obtained product triflate metal salt has low impurity content, is superior to the industry standard, the process is zero emission, and has good economic value and social value.

The invention discloses a cleaning composition as well as a preparation method and application thereof, and relates to the technical field of cleaning fluid. The invention relates to a low-k passivating agent which comprises the following components in percentage by mass: 10%-35% of an alkaline compound, 1%-40% of fluoride, 0.01%-10% of a cyclophosphazene compound, 0.01%-10.00% of a low-k passivating agent, 20%-80% of an organic solvent, 0.0001%-10.00% of a surfactant and the balance of water. By compounding the alkaline compound, the fluoride, the cyclophosphazene compound, the low-k passivator, the organic solvent, the surfactant and the water, various residues generated in the back-end process of semiconductor manufacturing can be effectively removed, and meanwhile, the contacted metal and non-metal materials cannot be obviously corroded. The etching rate on metal materials such as copper, tungsten and tantalum nitride and non-metal materials such as low-dielectric-constant insulating materials (BD) is low, and the operation window is large.

The invention discloses an environment-friendly fluoride-free bio-based paper protective coating easy to recycle as well as preparation and application thereof, and belongs to the technical field of paper-based packaging materials. The composition is mainly prepared by compounding a polyhydroxyalkanoate emulsion and a water-based acrylic polymer with a specific acid value and glass transition temperature. According to the scheme, a unique pH response switch is constructed, and the contradiction that an existing bio-based coating is high in brittleness and water resistance and alkaline repulping are difficult to consider at the same time is effectively solved on the premise of not depending on wax and additionally adding a cross-linking agent or a high-content surfactant. Compared with a traditional multi-component or high-energy-consumption recovery scheme on the market, the method has the advantages that excellent oil-proof and barrier properties and efficient fiber recovery under mild conditions can be realized only by a simple binary system, the formula complexity and the recovery cost are remarkably reduced, and the method has excellent environmental protection benefits and industrial application values.

This invention relates to a method for preparing carbon materials based on in-situ surface fluoride modification, comprising the following steps: ① dissolving carbon material powder, aluminum nitrate, and polyvinyl alcohol in anhydrous ethanol to obtain an aluminum nitrate solution; ② dissolving ammonium fluoride in a mixed solvent to obtain an ammonium fluoride solution; slowly adding the ammonium fluoride solution dropwise to the aluminum nitrate solution to carry out an in-situ AlF3 growth reaction to obtain a composite material precursor; ③ drying the composite material precursor and then calcining it using a programmed temperature rise method to solidify the coating layer, thereby obtaining the AlF3@C composite material. This invention also discloses the application of this carbon material. The preparation method of this invention is simple and low-cost, and can efficiently prepare AlF3@C composite materials. The obtained AlF3@C composite material, as a negative electrode material for potassium-ion or lithium-ion secondary batteries, can significantly improve a series of properties such as the initial coulombic efficiency, rate performance, cycle stability, and potassium ion diffusion kinetics of the battery.

The invention discloses preparation of a CS / BC / MBene composite aerogel material and application of the CS / BC / MBene composite aerogel material in photo-thermal water evaporation. A MoAlB precursor is etched through a fluoride-free hydrothermal method to prepare MoBTxMBene nanosheets, then the MoBTxMBene nanosheets, chitosan (CS) and bacterial cellulose (BC) are assembled through interaction of hydrogen bonds and the like, and the CS / BC / MBene composite aerogel with vertical pore channels is obtained through directional freeze drying. The aerogel has excellent photothermal conversion performance, mechanical strength and hydrophilicity, the maximum surface temperature of the composite aerogel under irradiation of one sunlight reaches 112.3 DEG C, the water evaporation rate of 5.06 kg.m <-2 >. H <-1 > and the photothermal conversion efficiency of 99.76% can be achieved, the composite aerogel is suitable for seawater desalination and sewage purification, the preparation method is environmentally friendly and simple, and the preparation method is suitable for industrial production. And the method has a wide industrial application prospect.

Disclosed are oral care compositions comprising: a tooth ligand mixture comprising a monocarboxylic acid, a dicarboxylic acid, and / or a tetracarboxylic acid; and a stannous ion source and a fluoride ion source, such as stannous fluoride. The oral care compositions show the ability to prevent and / or treat dental erosion and / or dental caries.

The application discloses a preparation method of perfluoroalkyl aryl sulfide, and a structural formula of the perfluoroalkyl aryl sulfide is shown as formula (I); the method comprises the following steps: firstly, obtaining corresponding aryl sulphenyl chloride by chlorination of thiophenol; under the condition that fluoride and crown ether exist, obtaining perfluoro-1,1-dimethylbutyl negative ion by addition of D-2 ‑ And the aryl sulphenyl chloride added is subjected to a nucleophilic substitution reaction to synthesize a product (1,1,1,3,3,4,4,5,5,5-decafluoro-2-trifluoromethylpent-2-yl)(aryl)sulfide. The application adopts a reaction strategy of efficient coupling of thiophenol and perfluoroalkyl, and can be used for preparing various fluorine-containing benzene sulfide compounds.

The invention relates to the technical field of smoke separation, in particular to rare earth electrolytic furnace smoke separation and recovery equipment which comprises a base, a rare earth electrolytic furnace, a hoisting arm, an anode component, a cathode component, a discharging device, a smoke separator, a blowing and material removing mechanism and a dust remover. The rare earth electrolytic furnace and the discharging device are installed on the base, the hoisting arm carries the anode component and is matched with the cathode component to achieve electrolytic reaction, the discharging device conveys rare earth raw materials, the flue gas separator separates fluoride and large-particle impurities in flue gas through a coarse filter screen and a pluggable ceramic fluorine adsorption plate, the blowing and material removing mechanism blows and recycles the fluoride, and the dust remover removes fine dust. The invention solves the problem of separation of fluorides in the flue dust of the electrolytic furnace.