597 results about "Layered double hydroxides" patented technology

The invention belongs to the technical field of catalysts, and relates to a surface-reconstructed heterojunction catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving cobalt salt, ferric salt and praseodymium salt in deionized water, heating and spraying on a carrier to prepare praseodymium-doped ferrocobalt layered double hydroxide; mixing the praseodymium-doped ferrocobalt layered double hydroxide with a phosphorus source, and calcining in an inert atmosphere to prepare praseodymium-doped CoP / Fe2P; and carrying out electrooxidation treatment on the praseodymium doped CoP / Fe2P, so as to prepare the Pr6O11 cluster modified CoFeOOH heterojunction catalyst. Through cooperation of three technologies of spray thermal deposition, phosphating and electrooxidation, stable construction and electrochemical activation of a heterogeneous interface are realized, the corrosion resistance and chlorine evolution resistance competitive capacity of the catalyst in a chlorine-containing alkaline system are remarkably improved, the current density of 100 mA. Cm <-2 > can be achieved only through 223 mV overpotential, and meanwhile, stable operation is performed for 500 h.

This invention discloses a method for preparing a CuZnAlGa-based layered double hydroxide (TLH)-derived catalyst for methanol production from carbon dioxide-rich syngas. Using Cu, Zn, Al, and Ga metal salts as precursors, Na₂CO₃ and NaOH as precipitants, and a mixed alcohol-water solution as an auxiliary solvent, co-precipitation is performed under controlled temperature and pH to obtain a LDH-like catalyst precursor. After high-temperature calcination and in-situ reduction in a hydrogen atmosphere, a layered framework structure of Cu nanoparticles immobilized by oxides is obtained. The LDH-like structure provides lattice confinement, preventing Cu particle aggregation, and the interaction between Cu and the oxides enhances the catalyst surface's adsorption capacity for CO and CO₂, thereby improving the activity and stability of methanol production from carbon dioxide-rich syngas.

The present disclosure pertains to methods for enhancing the properties of conventional Li / Al-LDH by integrating polymers to provide compositions comprising a Li / Al-LDH material and a polymer. The present disclosure further pertains to methods of using such polymer-modified-LDH to improve lithium adsorption and extraction performance. The disclosed methods can comprise incorporating the polymer during the precipitation reaction or by mixing the Li / Al-LDH product with a polymer solution under specific conditions. During the lithium extraction process, the disclosed compositions comprising a Li / Al-LDH material and a polymer can be used as an excellent lithium adsorbent to capture lithium ions from low-concentration lithium resources due to its improved physicochemical properties. The disclosed compositions comprising a Li / Al-LDH material and a polymer provides compositions for lithium extraction from low concentration resources, as well as expands the scope of lithium adsorbent material development.

The invention relates to a sludge biochar modified layered bimetallic oxide, and a preparation method and application thereof. The modified layered bimetallic oxide is prepared from the following main raw materials: domestic sewage aeration tank sludge, NaOH, Na2CO3, FeCl3. 6H2O and MnCl2. 4H2O. The domestic sewage aeration tank sludge is used for preparing dry sludge, the ferric chloride solution and the manganese chloride solution are used for preparing sludge composite layered double hydroxides, and the final layered bimetallic oxide composite sludge biochar catalyst can be prepared by calcining the sludge composite layered double hydroxides. The modified layered bimetallic oxide prepared by the scheme of the invention can effectively degrade bisphenol A, has relatively strong reusability, and still keeps good degradation ability in a relatively wide pH environment.

The invention provides a low-temperature-impact-resistant food packaging material and a preparation method and application thereof.The low-temperature-impact-resistant food packaging material is prepared from, by mass, 100 parts of polylactic acid, 1-10 parts of modified layered double hydroxide and 5-40 parts of hyperbranched polyester; wherein the modified layered double hydroxide is obtained by treating layered double hydroxide with a composite anionic surfactant and then treating the treated layered double hydroxide with an organic cationic compound with a long alkyl chain; the composite anionic surfactant comprises a first anionic surfactant and a second anionic surfactant; wherein the first anionic surfactant comprises sodium dodecyl sulfate; the second anionic surfactant comprises a sulfonate anionic surfactant containing an amido bond and a catechol structure. Through the formula design, the impact toughness of the material at low temperature can be improved while the mechanical property of polylactic acid is maintained, and the material can be suitable for the field of food packaging.

The invention relates to the technical field of electro-catalysis and hydrogen energy, in particular to a modified LDH-based catalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing trimesic acid, water, an organic solvent, a nickel salt, a cobalt salt and an iron salt, carrying out electro-deposition, washing and drying to obtain a NiFeCo-LDH (TA) catalyst; the preparation method comprises the following steps: soaking a NiFeCo-LDH (TA) catalyst in a silver salt solution, washing and drying to obtain the modified LDH-based catalyst. The modified LDH-based catalyst provided by the invention can effectively resist chloride ion corrosion and inhibit dissolution of active metals in layered double hydroxides (LDH) under high current density in seawater, can reach industrial grade current density under relatively low overpotential, and can stably run for more than 1000 hours.

The invention provides a Cu2O-based heterogeneous composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of a Cu2O hollow sphere substrate with a carbon layer, and depositing layered double hydroxides (LDHs) and metal palladium (Pd) nanoparticles on the carbon layer. According to the material, through a Cu2O-carbon layer-LDHs-Pd multistage heterostructure design, space optimization of light absorption, charge transfer and catalytic sites is realized; cu2O-carbon layer-LDHs interface coupling promotes directed migration of photo-induced electron-hole pairs, and the surface plasmon resonance effect of Pd nanoparticles enhances the charge separation efficiency; the LDHs optimizes a charge transfer path through surface oxygen vacancy or metal valence cycle, so that synergistic oxidation of non-free radicals and free radicals is realized, the organic matter degradation efficiency is remarkably improved, the oxidation path is widened, and the performance bottleneck of a single material is broken through.

The invention discloses a compostable and reslurrable mineral-based dual-scale barrier coating as well as preparation and application thereof, and belongs to the technical field of water-based and reslurrable barrier materials. In order to overcome the defects of high coating weight, large color difference or difficulty in recovery in the prior art, a compact barrier is constructed through double-scale collaborative design of interlayer intercalation of layered double hydroxides and interparticle metal micro-networks. The method has the prominent advantage that high-efficiency water-oxygen barrier better than that of a conventional scheme can be realized only by using an extremely low coating amount. Meanwhile, the coating strictly controls color difference to maintain high whiteness of the paper, has pH responsiveness, can be quickly unlapped and dispersed under an acidic condition, and is easy to re-pulp. The coating does not contain PFAS and PVDC, and unification of high barrier, high whiteness and recoverability is achieved.

The invention relates to the technical field of agriculture, in particular to a plant nutrient solution for saline-alkali soil improvement and a preparation method thereof. The invention relates to a preparation method of a plant nutrient solution for improving saline-alkali soil. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides and acid modified calcium-based montmorillonite; preparing humic acid chelated calcium magnesium powder; preparing a binary compound; and preparing the plant nutrient solution. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides from calcium nitrate tetrahydrate and aluminum nitrate nonahydrate, carrying out acid modification on calcium-based montmorillonite by using dilute sulphuric acid, purifying humic acid, and mixing with calcium chloride and magnesium chloride hexahydrate to prepare humic acid chelated calcium magnesium powder. Finally, the three components are added into pig excrement fermentation liquor to prepare a plant nutrient solution, an adsorption-replacement-leaching closed loop can be formed, the desalination and alkali reduction efficiency is remarkably improved, the soil structure is improved, the effect of synergistically improving the saline-alkali soil is achieved, and therefore plant growth is promoted.

The invention belongs to the technical field of anticorrosive coatings, and particularly relates to a high-temperature-resistant hydrophobic anticorrosive coating as well as a preparation method and application thereof. The invention provides a high-temperature-resistant hydrophobic anticorrosive coating, which is prepared from the following raw material components in parts by weight: 100 to 140 parts of epoxy resin; 3 to 7 parts of 2-benzothiazole thiosuccinic acid; 2 to 6 parts of hydrophobically modified ZIF-67 (at) MgAlCeFe-LDH (layered double hydroxide); 4-8 parts of a filler; 2-6 parts of a dispersant; 1-3 parts of a defoaming agent; 2-4 parts of a coalescing agent; 15-35 parts of a curing agent; 20 to 30 parts of water; and 10 to 20 parts of ethanol. The hydrophobic property of the coating can be improved by adding hydrophobic modified ZIF-67 (at) MgAlCeFe-LDH, and the corrosion resistance of the anticorrosive coating is remarkably improved by matching with 2-benzothiazole thiosuccinic acid and utilizing the interaction between the ZIF-67 (at) MgAlCeFe-LDH and the 2-benzothiazole thiosuccinic acid. The anti-corrosion coating prepared by the method has excellent corrosion resistance, hydrophobic performance and high temperature resistance.

The present disclosure relates to ruthenium-based catalysts for ammonia (NH3) synthesis at mild conditions and methods of preparing the ruthenium-based catalysts. The ruthenium-based catalyst includes a MgFeOx support and ruthenium metal loaded onto the support, wherein the catalyst has the chemical formula of MgFeOx—Ru, wherein x is the number of oxygen atoms present. In an example, x is equal to four. The MgFeOx support is prepared from MgFe layered double hydroxide (LDH). An amount of ruthenium present in the ruthenium-based catalyst ranges from about 0.1 to about 1.0 wt %.

The invention relates to the technical field of capacitor electrode materials, in particular to a biomass derived porous carbon and layered double hydroxide (LDH) composite material and a preparation method and application thereof. The invention provides a preparation method of a biomass-derived porous carbon and LDH composite material, which is characterized by comprising the following steps: mixing biomass-derived porous carbon, nickel salt, cobalt salt, ethylene glycol, hexamethylenetetramine and water, and carrying out hydrothermal reaction to obtain the biomass-derived porous carbon and LDH composite material, the pore structure of the biomass derived porous carbon comprises micropores, mesopores and macropores. The biomass derived porous carbon and LDH composite material has good specific capacitance, energy density and cycling stability, and can be used as a high-performance supercapacitor electrode material.

The invention belongs to the technical field of water electrolysis hydrogen production catalysts, and particularly relates to a preparation method and application of a bimetallic phosphide coupling layered double hydroxide electrocatalyst. The preparation method comprises the following steps: by taking a nickel source, an iron source, ammonium fluoride and urea as reactants, carrying out hydrothermal reaction to form a nickel-iron layered double hydroxide nano-catalyst precursor on a conductive substrate; and carrying out phosphating treatment on the nickel-iron layered double hydroxide nano-catalyst precursor by an electrodeposition method to obtain the bimetallic phosphide coupled layered double hydroxide electrocatalyst. Under the 1M potassium hydroxide solution test condition, the overpotential required by the catalyst is 89 mV when the current density in a linear scanning voltammetry curve is 10 mA cm <-2 >, and the catalyst is high in stability, simple in manufacturing process, energy-saving, suitable for industrial application and capable of being used for large-scale water electrolysis hydrogen production.

The invention discloses a high-barrier polyethylene film and a preparation method thereof, and relates to the technical field of high polymer materials. The invention discloses a high-barrier polyethylene film. The high-density polyethylene composite material is prepared from the following raw materials in parts by weight: 25 to 40 parts of high-density polyethylene, 15 to 30 parts of linear low-density polyethylene, 8 to 16 parts of ethylene-vinyl alcohol copolymer, 3 to 8 parts of nano montmorillonite, 5 to 10 parts of modified layered double hydroxide, 2 to 6 parts of nano silicon dioxide aerogel, 0.2 to 0.6 part of antioxidant 1076, 0.1 to 0.4 part of light stabilizer UV-770, 3 to 7 parts of tributyl citrate and 1 to 3 parts of octadecanamide. 1-3 parts of polyethylene wax, 0.6-1.2 parts of a silane coupling agent KH560 and 7-12 parts of a functional additive. According to the high-barrier polyethylene film disclosed by the invention, by using the modified layered double hydroxide and the functional additive, the barrier property and the antibacterial property are enhanced, the mechanical property is improved, the comprehensive performance is excellent, and the application prospect is good.

The invention belongs to the technical field of new materials, and relates to a layered double hydroxide film using polysulfone resin as a binder, and the layered double hydroxide film is obtained by connecting layered double hydroxide particles or layered double hydroxide nanosheets into a continuous film by using the polysulfone resin as the binder. The invention further relates to a preparation method and application of the layered double hydroxide film with the polysulfone resin as the binder. The layered double hydroxide membrane provided by the invention adopts the LDH with anionic conductivity as a main body, and the surface resistance of the layered double hydroxide membrane in an alkaline solution is obviously lower than that of a commodity Zirfon membrane, so that the membrane provided by the invention can show higher electrolysis efficiency when being used for water electrolysis. The membrane forming method is based on the common phase inversion principle in separation membrane preparation in the field of chemical separation, so that large-scale preparation can be conveniently achieved through technological parameter change on the basis of mature industrial equipment for separation membrane phase inversion preparation, and batch preparation is easy to achieve.

There is disclosed a method of constructing a layered double hydroxide (LDH) material comprising selected metal ions, and employing metallic vanadium carbide (V2C) for promoting conductive properties of the LDH material, wherein the layered LDH material is a trimetallic LDH material. The trimetallic LDH material comprises selected Ni2+, Co2+, and A3+ metal ions with its cationic configuration for improving photocatalytic properties of the LDH material, wherein trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C)-based composite is coupled with a graphitic carbon nitride (g-C3N4) nanosheet, to form a hybrid-junction photocatalyst. Also disclosed is a layered structure of vanadium carbide (V2C) MXenes, comprising trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C) coupled with graphitic carbon nitride (g-C3N4), forming a NixCoyAlz LDH / g-C3N4 hybrid-junction photocatalyst.

The application discloses an electrochemiluminescence immunosensor for detecting interleukin-1 beta and a preparation method and application thereof, and comprises a three-electrode system of a working electrode, a reference electrode and a counter electrode; the working electrode is a modified electrode of CoAl layered double hydroxide, is loaded with platinum nanoparticles after being etched by alkali, and is obtained by fixing interleukin-1 beta antibodies and blocking non-specific sites; and a solution containing luminol is used as an electrolyte during detection of the immunosensor. The working electrode of the immunosensor takes oxygen-rich vacancy CoAl layered double hydroxide as a substrate, combines with platinum nanoparticles to realize EMSI effect, significantly enhances the electrochemiluminescence signal of a luminol-dissolved oxygen system, realizes quantitative detection of IL-1 beta by combining with specific antigen-antibody recognition, and has the characteristics of strong anti-interference ability, fast detection speed and good stability.

The invention discloses a cobalt-iron layered double-metal hydroxide water treatment catalyst, which is characterized in that the cobalt-iron layered double-metal hydroxide is doped with europium element. Compared with existing ferrocobalt layered double hydroxides, after europium is doped, europium can generate a synergistic interaction effect with iron and cobalt, so that the catalytic activity of the material is remarkably improved.

Belonging to the technical field of fireproof coatings, the invention relates to a building fire protection coating fireproof material, which is prepared from the following raw materials: 45-55 parts of acrylic emulsion, 20-25 parts of modified intumescent flame retardant, 5-8 parts of pigment filler, 3-5 parts of dispersant, 1-3 parts of defoaming agent and 20-30 parts of deionized water. According to the technical scheme, the flame-retardant material is obtained by combining the flame-retardant compound with the amino silane; the fireproof filler is coated with layered double hydroxides, so that a reinforcing material is obtained; a flame-retardant material is combined with a reinforcing material to obtain a modified intumescent flame retardant; and uniformly mixing the acrylic emulsion, the modified intumescent flame retardant, the pigment filler, the dispersing agent, the defoaming agent and the deionized water to finally obtain the building fire-fighting coating fireproof material. The modified intumescent flame retardant well improves the fireproof performance, the flame retardant performance and the impact resistance of the fireproof coating material, the environment-friendly performance is good, and the comprehensive performance of the building fire-fighting coating fireproof material is integrally improved.

The invention discloses a modified thermoplastic solid-solution anticorrosive coating, a preparation method thereof and application of the modified thermoplastic solid-solution anticorrosive coating on the surface of a pneumatic actuator, and belongs to the field of industrial equipment surface protection materials. Two novel modifiers are designed to construct a multi-protection system. Wherein the layered double hydroxide-silane covalent grafting modifier takes magnesium-aluminum layered double hydroxide as a matrix, and after covalent modification by a silane coupling agent, the matrix is compounded with a quinoline derivative in an intercalation manner, so that the interface bonding and barrier properties are improved; according to the polyaniline-graphene covalent grafting modifier, few layers of graphene and polyaniline are copolymerized and then grafted with a polyurethane prepolymer, so that the toughness and the conductive corrosion resistance of a coating are enhanced. The coating is prepared by taking polyethersulfone as a matrix, compounding the modifier, nano silicon dioxide and other components, mixing, dissolving, dispersing at a high speed and ultrasonically defoaming. The coating has the advantages of high interface adhesion, strong corrosion resistance, dynamic fatigue resistance, environmental protection, no solvent and the like, and is suitable for surface protection of key components such as a pneumatic actuator shell.

The invention discloses a flame-retardant coating and a preparation method thereof, and relates to the technical field of coatings, the flame-retardant coating comprises the following raw materials: 100 parts of epoxy resin, 25-50 parts of hexagonal boron nitride functional modified ammonium polyphosphate, 20-30 parts of cerium-cobalt-iron layered double hydroxide, 10-15 parts of hafnium diboride, 8-16 parts of a fireproof filler, 18-30 parts of a fluxing agent, and 20-25 parts of a curing agent; the hexagonal boron nitride functionalized modified ammonium polyphosphate is prepared from the following raw materials in parts by weight: 1-3 parts of functionalized boron nitride nanosheets, 5-10 parts of ammonium polyphosphate, 70-90 parts of ethanol and 7-9 parts of water. The cerium-cobalt-iron layered double hydroxide comprises the following raw materials: 3-4 parts of cerium nitrate hexahydrate, 2-4 parts of cobalt nitrate hexahydrate, 16-20 parts of iron nitrate nonahydrate, 80-100 parts of deionized water, 20-30 parts of a sodium hydroxide solution and 60-80 parts of a sodium carbonate solution. The flame retardant provided by the invention has excellent flame retardant property.

The invention provides a lime-sand polymerized building material for inhibiting saltpetering and a preparation method thereof, and belongs to the technical field of novel building materials, the material comprises a composite matrix material, a composite alkali activator, a slow-release organic acid microcapsule, a modified layered double-metal hydroxide and an saltpetering inhibiting auxiliary agent; the composite base material is formed by compounding fly ash and slag; the composite alkali activator is compounded by water glass and a NaOH aqueous solution; the slow-release organic acid microcapsule is prepared by coating a compound acid formed by mixing citric acid and tartaric acid with hydroxypropyl-beta-cyclodextrin and sodium alginate; the modified layered double hydroxide is prepared by calcining MgAl-LDH, then carrying out surface modification by a silane coupling agent, and then loading nano SiO2; the saltpetering inhibition auxiliary agent is compounded by phytic acid modified lignin microcapsules and thermal response carbonate; the phytic acid modified lignin microcapsule is prepared by modifying sodium lignin sulfonate with phytic acid and then coating with ethyl cellulose and polyvinyl alcohol; the thermal response carbonate is prepared by coating calcium carbonate with stearic acid.

The invention belongs to the technical field of lithium ion adsorption materials, and relates to a preparation method of a multi-element co-doped lithium-aluminum layered double hydroxide and a lithium extraction adsorbent. The invention discloses a preparation method of a multi-element co-doped lithium-aluminum layered double hydroxide. The preparation method comprises the following steps: (1) dissolving an aluminum salt, a lithium salt and a low-valence metal element salt in water to obtain a precursor solution; (2) slowly adding a bio-based precipitant to adjust the pH value, and heating and stirring for reaction to obtain a precursor colloidal solution; (3) adding a modifier containing a non-metallic element X to adjust the pH value, carrying out ultrasonic dispersion, and transferring to a microwave reaction kettle to carry out a microwave reaction; the lithium-aluminum layered double hydroxide co-doped with the low-valence metal element M and the non-metal surface modification element X is obtained. According to the method, the diffusion rate and the adsorption performance of lithium ions are remarkably improved; according to the lithium extraction adsorbent disclosed by the invention, the adsorption efficiency and selectivity of lithium ions in salt lake brine with a high magnesium-lithium ratio are remarkably improved.

The invention discloses an NF-loaded high-valence metal doped-high-entropy layered double hydroxide / MOF composite material, and belongs to the technical field of high-entropy catalysts. A two-step hydrothermal method is adopted, firstly, a metal organic framework material (MOF) precursor Ni-MOF is prepared through the hydrothermal method, then a metal salt solution containing iron, zinc, cerium, cobalt and the like is prepared at the room temperature, the solution is fully stirred and subjected to ultrasonic uniformization and transferred into a high-pressure kettle, the precursor Ni-MOF is added, and the metal salt solution containing iron, zinc, cerium, cobalt and the like is obtained. And carrying out hydrothermal treatment, washing and drying to obtain the high-valence metal doped high-entropy layered double hydroxide / MOF composite material loaded on foamed nickel (NF). According to the technical scheme, due to the synergistic effect of the MOF and the high-entropy LDH, the MOF / LDHs have excellent electrochemical performance, and the introduction of the high-valence metal can regulate an electronic structure and expose rich active sites, so that the electrocatalytic activity of the MOF / LDHs is improved, and excellent HER, OER and UOR activities are obtained.

The invention discloses a sulfur-doped nickel-cobalt-iron layered double hydroxide nanosheet array catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, nickel foam is subjected to surface modification, a NiCo LDH nanosheet array evenly distributed grows on the surface of the nickel foam, then the nickel foam is soaked in a solution containing iron ions and sodium thiosulfate, and an S-NiCoFe LDH nanosheet array is obtained; and the nickel-cobalt-based self-supporting OER electrocatalyst is prepared. The electrode material has the advantages that the three-dimensional porous self-supporting electrode does not need an organic adhesive or a supporting electrode; the raw materials are non-noble metals, low in price and wide in source. The obtained nickel-cobalt-based self-supporting electrode material shows good OER performance in 1mol / L KOH, the overpotential of the catalyst at 100mA / cm < 2 > is 283mV, and after 48h stability test, the performance of the catalyst is not obviously attenuated.

The invention relates to a nickel-iron layered double hydroxide with flaky nanoflower morphology and a preparation method and application thereof. The preparation method of the nickel-iron layered double hydroxide comprises the following steps: S1, dissolving nickel acetate in an organic solvent or a mixed solvent of the organic solvent and water to prepare a first solution; dissolving ferrite in water to prepare a second solution; and S2, uniformly mixing the first solution and the second solution to obtain a mixed solution, and standing and aging to obtain the ferronickel layered double hydroxide. The method is simple to operate, mild in reaction condition, low in equipment cost and green and environment-friendly in synthesis process; the NiFe-LDH prepared by the method is of a three-dimensional nanoflower structure, is uniform in morphology, has a high specific surface area, can provide more active sites, shows excellent electro-catalytic performance when being used as a catalyst for oxygen evolution by electrolysis of water, and has a wide application prospect in the fields of electrochemical energy storage, electro-catalysis, catalytic oxidation and the like.

The invention relates to the technical field of gel material preparation, in particular to a bio-based gel material for dangerous chemical leakage disposal and a preparation method thereof.The preparation method comprises the steps that gelatin and deionized water are added into a reaction container, a gelatin solution is obtained under the preset dissolution condition, alkaline protease is added into the gelatin solution for an enzymolysis reaction, and a gelatin solution is obtained; a modified gelatin solution is obtained; the preparation method comprises the following steps: adding a phytic acid-chitosan compound and magnesium-aluminum layered double hydroxide into dispersion equipment, and obtaining a composite inorganic matter dispersion liquid under a preset dispersion condition; adding the modified gelatin solution, the composite inorganic substance dispersion liquid, polyethylene glycol and phase change microcapsules into a mixing reactor, and obtaining a premixed solution under a preset mixing condition; sequentially adding an initiator, a cross-linking agent and tetramethylethylenediamine into the premixed liquid, and performing cross-linking reaction under preset cross-linking conditions to obtain a bio-based gel initial product. The plugging efficiency of the bio-based gel material on dangerous chemical leakage is improved.

The invention discloses a bio-based core-shell flame retardant, a preparation method thereof and a preparation method of a composite material. A novel biomass-based polyphosphazene flame-retardant microsphere (PHRB) is prepared based on a condensation reaction of biomass resveratrol and phosphonitrilic chloride trimer, a self-sacrifice template method is further adopted, three-dimensional (3D) cobalt layered double hydroxide (Co-LDH) grows on the surface of the microsphere in situ, and the 3D bio-based Co-LDH-PHR flame retardant with a core-shell structure is successfully constructed. The bio-based core-shell flame retardant obtained in the invention has good thermal stability, high residual carbon content, high flame retardant efficiency and good compatibility with a base material, and the flame-retardant polyurea composite material prepared from the bio-based core-shell flame retardant as a raw material still has excellent mechanical properties. The bio-based core-shell flame retardant disclosed by the invention is wide in raw material source, relatively low in cost, simple in synthesis mode, convenient to operate and easy for large-scale production.

The invention relates to the technical field of food packaging, in particular to a bacteriostatic aluminum foil material for a meal box and a preparation method thereof. The material is subjected to aluminum foil surface activation, then is sequentially impregnated in a sol impregnation liquid and an outer layer coating liquid, is subjected to dip coating, and finally is subjected to ultraviolet curing to obtain a multi-layer composite structure. The middle layer is made of an aminated organic silicon material and is firmly combined with the aluminum base material and the outer layer resin through chemical bonds, so that the adhesive force of the coating is remarkably improved. The outer coating is added with a phenyl triazole modified layered double hydroxide loaded nano-silver antibacterial agent, so that slow release and efficient broad-spectrum antibacterial property of silver ions are realized, the thermal stability is improved, and reliable performance under a high-temperature condition is ensured. The multilayer design and multiple antibacterial mechanisms have a synergistic effect, the problems of poor antibacterial durability, insufficient adhesive force, low heat resistance and the like of a traditional lunch box aluminum foil material are effectively solved, meanwhile, food safety is considered, and the aluminum foil material is suitable for the field of modern high-requirement food packaging.

The invention belongs to the technical field of new materials, and discloses a layered double hydroxide film for alkaline water electrolysis, and the layered double hydroxide film is obtained by connecting layered double hydroxide particles into a continuous film by using polytetrafluoroethylene as an adhesive. According to the invention, polytetrafluoroethylene (PTFE) is used as an adhesive, and layered double hydroxide (LDH) particles are connected into a continuous compact film by a calendering method. The preparation method does not need or rarely needs to use an organic solvent, and is easy for continuous industrial production. When the prepared layered double hydroxide film is used for alkaline water electrolysis, the sheet resistance and hydrogen permeability which are obviously lower than those of a commodity Zirfon film are shown, and the layered double hydroxide film can be widely applied to industrial production and has relatively high ionic conductivity.