94results about How to "Increase the aperture" patented technology

The invention provides a binder for a catalytic cracking catalyst and a preparation method thereof, the binder comprises a sizing material, a curing agent and a modifier, and the curing agent is prepared from a gamma-alumina precursor, an acid and an alkyl ammonium salt through a hydrothermal reaction; the modifier is prepared by reaction of a polymeshed chelating ligand, a metal center ligand, ethanol and organic acid; the sizing material comprises a phosphorus-containing compound and an aluminum-containing compound. In the adhesive of the catalytic cracking catalyst provided by the invention, a metal center ligand composed of a multi-metal chelating ligand and a plurality of metals is introduced, under the promotion of organic acid and ethanol, a multi-metal chelate modifier can be prepared in situ in the process of preparing the adhesive, and compared with the direct use of a commercially available metal chelate, the preparation method has the advantages that the cost is low, and the efficiency is high. The in-situ prepared multi-metal chelate modifier has better water solubility, can promote the combination of the modifier and the phosphorus-aluminum sol, and has a better modification effect.

The invention relates to a preparation method of a water-based environment-friendly coating, in particular to a preparation method of a multi-layer alternating type super-hydrophobic self-cleaning water-based environment-friendly coating, which is characterized in that TiO2 / ZIF-8 micro-nano structure particles with photocatalytic performance are prepared by growing ZIF-8 on the surface of carboxylated modified TiO2 in situ. Perfluorodecyl trimethoxy silane (PFDTES) is used as a main substance with a hydrophobic function, and water-borne epoxy resin (EP) is introduced to hybridize water-borne fluorocarbon resin (FEVE) to serve as a bonding layer. The preparation method comprises the following steps: chemically bonding TiO2 / ZIF-8 / PFDTES and hybrid resin by gamma-aminopropyltriethoxysilane (KH550) carrying activation sites through a site regulation and control technology, so as to form the synergistically functionalized super-hydrophobic self-cleaning water-based environment-friendly emulsion. And the coating isolates the adhesion effect of most bacteria and the harm of domestic sewage. The photocatalytic function can degrade an oil film formed by pollutants such as organic substances and oil stains on the surface of the material. The multi-layer alternate functional coating greatly enhances the corrosion resistance of the substrate material, and prolongs the service life of the material.

The invention discloses a method for preparing a core-shell structure phase hydrorefining catalyst, comprising the following contents: (1) gelling, aging and filtering a first precipitant, a sodium molybdate solution and a solution containing Ni and Si to obtain a filter cake of a first slurry, and then treating it with a mixed aqueous solution of aluminum salt and organic alcohol to obtain a mixed slurry; (2) adding a Ni-containing solution, a sodium tungstate solution, a second precipitant and the mixed slurry obtained in step (1) to a reactor containing water and an oily liquid to gel and age them to generate a second slurry; (3) filtering, drying and molding the slurry to obtain a molded product; (4) soaking the molded product in an organic acid solution, and desalting the soaked molded product to obtain a catalyst. The preparation process of the method is clean and pollution-free, and the prepared catalyst has a core-shell structure, a large pore volume and a large pore size, and is used in processes such as distillate hydrodesulfurization and denitrogenation, and has high hydrodesulfurization and hydrodenitrogenation reaction performance.

The present invention relates to the technical field of nanomaterials, and in particular to a drug-loaded mesoporous silica sustained-release system and a preparation method thereof. Firstly, mesoporous silica is prepared by a soft template method, and then the drug is loaded on the mesoporous silica by an impregnation method. Then, the drug-loaded mesoporous silica is coated with chitosan. The prepared drug-loaded mesoporous silica sustained-release system has pH responsiveness, can achieve long-term sustained-release of drugs, and can maximize the therapeutic effect of the drugs.

The invention relates to the technical field of rubber foaming materials, and discloses a preparation method and application of a microporous EPDM rubber foaming material. The anti-aging co-crosslinking agent structure contains a multi-maleimide group, which can generate chemical crosslinking with the EPDM rubber, and the crosslinking activity of the molecular chain is enhanced, so that the carbon dioxide dissolved in the matrix is ​​not easy to diffuse out of the matrix, and the nucleation sites are gradually increased, which can support the formation of the pore structure and maintain the integrity of the pore structure, so as to form a dense microporous structure; the imide heterocycle, triazine ring and benzene ring in the anti-aging co-crosslinking agent have strong high temperature resistance. In the rubber vulcanization process, the double bonds are opened to participate in the crosslinking reaction, and free radical active species are formed, which undergo a co-crosslinking reaction with the EPDM rubber, improve the crosslinking network structure, improve the heat air aging resistance and salt spray aging resistance of the EPDM rubber, and enhance the elastic recovery ability of the rubber.

The invention provides a thermal insulation material and a battery pack. The thermal insulation material comprises cellulose aerogel and an organic phase change material dispersed in the cellulose aerogel; wherein the cellulose aerogel is obtained by reacting bacterial cellulose with a cross-linking agent. According to the thermal insulation material provided by the invention, the cross-linking agent is used for modifying the bacterial cellulose aerogel, the pore diameter of the cellulose aerogel is greatly improved, the cellulose aerogel is used as a supporting material of an organic phase change material, the thermal insulation material with ultrahigh energy storage efficiency is prepared, and the thermal insulation material can be applied between battery cells when the heat generated by a monomer battery cell is too high. Heat is effectively absorbed, and heat spreading of the battery cells caused by direct heat conduction between the battery cells between the modules is prevented.

The invention belongs to the technical field of catalysts, and particularly relates to a novel full-fraction waste mineral oil hydrogenation catalyst and a preparation method thereof. According to the invention, polyethylene glycol is adopted as a surfactant, and a catalyst carrier with a high specific surface area is prepared through a coprecipitation process. And on the basis of the Mo-Co catalyst, a certain amount of metal manganese and cerium are added. Dispersion of active components in the catalyst is promoted through the pre-deposited cerium oxide auxiliary agent, interaction between metal and the carrier is weakened, and increase of the specific surface area of the catalyst is promoted. The addition of manganese can enhance the interaction of the components of the catalyst, and especially the formation of manganese oxide can effectively promote the dispersion of active components and prevent excessive sintering of the catalyst, thereby effectively improving the activity of the catalyst. The catalyst has the advantages of high specific surface area and pore size, high catalytic activity, effective improvement of the desulfurization and denitrification rate of the waste mineral oil, and wide application prospect.

The invention relates to the technical field of modified biochar, in particular to application and method of transient electromagnetic pulse and Fe modified biochar, and the method comprises the following steps: S1, biochar is put into a transient electromagnetic pulse field for treatment for 0.5-3.5 h, the voltage is 5-25 kV, and the frequency is 10-80 Hz; s2, adding the biochar obtained in the step S1 into a FeCl3 solution, adjusting the pH value of the solution to 9-11 by using 1mol / L NaOH, and controlling the reaction temperature on a shaking table at 25 DEG C for 24 hours; and S3, after the reaction in the step S2 is finished, filtering, washing with distilled water until the pH value of the filtrate is neutral, and then drying in a drying oven at 70 DEG C for 24 hours to obtain the transient electromagnetic pulse combined Fe modified charcoal. The surface structure and the pore structure of the biochar are improved through treatment of a transient electromagnetic pulse technology, and the specific surface area and the porosity of the biochar are remarkably increased, so that more favorable conditions are provided for Fe loading, and phosphate in water is effectively adsorbed.

The present application relates to the technical field of biomedicine, and specifically discloses a sodium alginate embolic particle and its preparation method and application. The preparation method of the sodium alginate embolic particle disclosed in the present application comprises the following steps: dissolution, primary freeze drying, infiltration, cross-linking, secondary freeze drying, crushing and screening, and sterilization; dissolution is: preparing a 1.7-2.3wt% sodium alginate aqueous solution, adding a freeze-drying protective agent, stirring at 55-65°C, and cooling to 0-5°C; infiltration is: infiltrating the sodium alginate sponge obtained by primary freeze drying in a sodium alginate aqueous solution with a mass concentration of 0.1-0.8wt% to reach saturation, and obtaining a sodium alginate infiltrate; cross-linking is: immersing the sodium alginate infiltrate in a cross-linking liquid for cross-linking reaction. Using the technical solution provided by the present application, sodium alginate embolic particles with high porosity, uniform particle size, small average pore size, suitable water absorption, excellent suspension performance, and excellent catheter passing performance can be obtained.

The invention discloses a biomass-based activated carbon material, and relates to the technical field of activated carbon material preparation, and the biomass-based activated carbon material comprises the following components by weight: 1 part of peony seed meal; 1-2 parts of cedar bark; the preparation method of the biomass-based activated carbon material specifically comprises the following steps: S1, drying, crushing and mixing peony seed meal and cedar bark to obtain a mixed raw material A; s2, putting the mixed raw material A into an evaporator, and performing low-temperature evaporation to obtain a mixed raw material A with high sulfate content; s3, performing ultrasonic impregnation and drying on the mixed raw material A with high sulfate content; carbonizing and activating to obtain a mixed carbon material B; s4, mixing the mixed carbon material B with sodium amide, and activating while isolating air to obtain a biomass-based activated carbon material; the problem of unstable quality of the biomass-based activated carbon material caused by unstable quality of the desulfurization waste liquid in the prior art is solved, the biomass-based activated carbon material with stable quality is prepared, the pore structure of the biomass-based activated carbon material is further optimized, and the adsorption performance is improved.

The present application relates to complex stratum pile foundation construction technology field, disclose a kind of riprapping stratum full casing rotary and rotary drilling combined hole construction method, comprising the following steps: leveling construction ground;Pile position lofting is carried out, and guiding positioning structure is set;First section casing with grouting passage is installed on full casing rotary drilling machine, grouting passage is used for grouting;Through full casing rotary drilling machine clamping casing, drive casing press into riprapping stratum, while rotary drilling carries out soil taking;Slurry is injected by grouting passage, and riprapping body outside casing is consolidated to form annular consolidated body;The elevation difference between the soil taking surface of rotary drilling and the bottom end of casing is controlled to be within the preset range, and the following protection wall is formed;Lengthen next section casing, and connect adjacent grouting passage;Until casing penetrates riprapping layer and main sand layer and enters lower stable layer.The present application can solve the problems of difficult riprapping stratum hole forming, easy hole collapse, easy grouting leakage and easy drill sticking.

The invention discloses a shaped charge liner capable of increasing the penetration depth and the hole diameter and a perforating bullet. The shaped charge liner comprises a liner body formed by connecting a liner top and a liner wall into a whole. The cover top is an arc top, and the cover wall is an arc wall. The arc top and the arc-shaped wall are smoothly connected at the joint in a tangent manner; the problems that an existing shaped charge cover is limited by an original design structure, and the penetration depth and the aperture of a perforating bullet are difficult to effectively increase are solved.

This invention discloses a carbon-coated iron porous aerogel, its preparation method, and its application in lithium metal anodes, belonging to the field of lithium metal anode material preparation. The carbon-coated iron porous aerogel of this invention constructs a continuously conductive and highly stable carbon-based porous three-dimensional framework through the synergistic effect of two-dimensional graphene oxide, one-dimensional carbon nanotubes, and carbon-coated iron units. The NaCl hard template effectively amplifies the macropore size and increases the number of pores, providing interconnected channels for the rapid wetting and spontaneous climbing of molten lithium. The carbon-coated iron interface serves as a stable lithiophilic site, inducing uniform nucleation of lithium metal and restricting disordered growth, thereby achieving stable confinement of lithium metal in the composite electrode.

The invention provides starch-based dual-network antibacterial hydrogel loaded with aloe extract as well as a preparation method and application of the starch-based dual-network antibacterial hydrogel, and belongs to the field of hydrogel. The aloe extract is prepared by adopting an ultrasonic-assisted alcohol extraction method, and the aloe extract is embedded into a physicochemical dual-network of the amylose-polyvinyl alcohol-borax hydrogel prepared by adopting a retrogradation freeze-thawing method; the starch-based dual-network antibacterial hydrogel loaded with the aloe extract, which is strong in antibacterial ability, high in biological safety and compatibility and good in mechanical property, is obtained. The hydrogel has the advantages of simple preparation method and low cost, and is widely applicable to the fields of biomedicine and daily chemicals with the requirements of hemostasis, antibiosis, drug administration and the like.

The present invention relates to the technical field of nano calcium carbonate, and in particular to a single-component dealcoholized nano calcium carbonate for silicone adhesive and a preparation method thereof. The preparation method comprises the following steps: S1, carbonizing Ca(OH)2 refined slurry to obtain a carbonized liquid; S2, heating the carbonized liquid to 55-75°C, adding a modifier I for modification, obtaining a nano calcium carbonate slurry, and obtaining a nano calcium carbonate powder after filter pressing and drying; S3, modifying the nano calcium carbonate powder with a modifier II to obtain a dealcoholized nano calcium carbonate for silicone adhesive; the modifier I is composed of C 16 ‑C 20 One of fatty acid and its salt, sulfonate and its ester, and advanced phosphate is mixed with chelated titanate coupling agent in a mass ratio of 2-4:1; modifier II is mixed with titanate coupling agent and silane coupling agent. The one-component dealcoholized silicone adhesive prepared from nano calcium carbonate has excellent properties of low modulus, high elongation, high adhesion and high storage stability.

The application discloses a high-strength, large-pore-volume phosphorus-containing binder, characterized in that the binder comprises a glue, a curing agent and a modifier; the glue comprises a phosphorus-containing compound and an aluminum-containing compound; the curing agent comprises a gamma-aluminum oxide precursor, an acid and an alkylammonium salt, and the modifier is a metal chelate; wherein the colloidal solubility index of the gamma-aluminum oxide precursor is less than or equal to 50%; and the modifier is reacted with the glue in a high-shear dispersion emulsifier. The phosphorus-containing binder provided by the application, in combination with a conventional method, can obtain a catalytic cracking catalyst which, on the basis of high molecular sieve content and large pore volume, still has high wear resistance.

The invention discloses a front end framework left and right mounting support stamping system which comprises a progressive die, the progressive die comprises an upper die and a lower die, the upper die is located at the top of the lower die, a floating material guide block is arranged at one end of the upper die, and a material belt guide ruler used in cooperation with the floating material guide block is arranged at the corresponding position of the lower die. The other end of the lower die is provided with a product sliding groove and a waste sliding groove. By integrating floating material guiding and multi-station continuous stamping, automatic feeding, accurate positioning, multi-procedure synchronous machining and automatic separation of finished waste are integrated, a floating material guiding block of the upper die and a material belt guiding ruler of the lower die are matched at the feeding end to achieve lifting and transverse guiding of a material belt, and the automatic feeding, accurate positioning, multi-procedure synchronous machining and automatic separation of the finished waste are achieved. In the punching process, a guide hole used for accurate positioning in the whole process is punched at first, then a guide pin is used for hole pin inserting and positioning before feeding in each subsequent step, and therefore the accumulated feeding error is effectively restrained.

The present invention provides a MOR molecular sieve membrane and a preparation method thereof, wherein the preparation method of the MOR molecular sieve membrane comprises the following steps: S1, mixing an aluminum source, an alkali solution, a silicon source, a fluoride salt, an organic alcohol and water to obtain a synthetic sol; S2, coating a seed solution on the surface of a porous carrier to obtain a seed layer; S3, coating the synthetic sol on the surface of the seed layer, and performing three temperature-variable crystallizations to obtain a MOR molecular sieve membrane; in step S1, the molar ratio of SiO2, Na2O, Al2O3, ROH, NaF and H2O is 1: (0.1-0.35): (0.03-0.15): (0.2-2): (0.1-0.5): (10-100). The present invention adds an organic alcohol to improve the crystallinity and overall structural integrity of the MOR molecular sieve membrane structure.

The invention discloses a matrix filling-based co-prime array coherent DOA (direction of arrival) estimation method, which specifically comprises the following steps of: 1, constructing a co-prime array coherent signal array model to obtain a covariance matrix of a signal; 2, selecting a first row of the covariance matrix to construct a Toeplitz matrix; step 3, filling a zero part in the Toeplitz matrix through a nuclear norm minimization method to obtain a covariance matrix required by DOA estimation; and 4, solving the covariance matrix obtained in the step 3 by using a MUSIC method to obtain a DOA estimation result. According to the method, the array aperture can be effectively increased, higher spatial freedom and positioning precision are achieved, more targets can be estimated, the calculation complexity is reduced while the estimation performance is ensured, and real-time processing is easy.

The present invention discloses a bulk hydrorefining catalyst and a preparation method thereof. The bulk hydrorefining catalyst of the present invention has a core phase of an amorphous composite oxide containing molybdenum, nickel and silicon, and a shell phase of an amorphous composite oxide containing tungsten, nickel and aluminum. The preparation method is as follows: (1) a first precipitant, a sodium molybdate solution and a solution containing Ni and Si are subjected to a first gelling reaction and a first aging to obtain a first slurry containing Ni, Si and Mo; (2) water and an oily liquid are added to a reactor, and then a solution containing Ni and Al, a sodium tungstate solution, a second precipitant and the first slurry are subjected to a second gelling reaction and a second aging to generate a second slurry; (3) the second slurry is aged and molded; (4) the molded product is subjected to a desalting treatment to obtain a catalyst. The catalyst prepared by the present invention has a large pore volume and pore diameter, has a high hydrodesulfurization and hydrodenitrogenation reaction performance, can avoid excessive cracking of diesel fractions, and has good raw material adaptability, and can process inferior distillate oil raw materials.

The invention discloses a preparation method of a super-hydrophobic microporous separation membrane, which comprises the following steps: introducing nanoparticles into a membrane casting solution system to form a multielement membrane casting solution system consisting of polymer / solvent / additive / nanoparticles, and preparing the separation membrane through a non-solvent induced phase separation process. The nanoparticles are particles subjected to hydrophobic modification by using perfluoro and polyfluoroalkyl compounds, and have through pore structures and rich hydroxyl groups on the surfaces. A hydrophobic fluorine-containing long chain modified on the surface of a hydrophobic / hydrophilic pore channel particle obviously enhances the compatibility and dispersity of the hydrophobic / hydrophilic pore channel particle in a PVDF casting membrane solution, and richer hydrophilic hydroxyl groups on the surface of the uniformly distributed particle promote the exchange of a water phase and a polymer-rich phase during phase separation; the through pore channel structure can also be used as a mass transfer channel of water coagulating bath during phase inversion and water vapor during membrane distillation, through the interaction, the membrane pore diameter is increased, the porosity is improved, meanwhile, polymer crystallization is induced to form a rough spherical particle structure, and a super-hydrophobic surface is constructed.

The application discloses a kind of sparse array amplitude-phase error correction-based meshless parameter estimation method, and its implementation steps are: receiving end is laid out sparse array;The received signal of sparse array with array element gain phase error is modeled;Sample covariance matrix is constructed;The output signal of virtual differential common array is calculated by vectorization;Define the atom norm of introducing amplitude-phase error parameter, and construct the optimization model for target direction estimation;By dual atom norm, the original optimization problem is converted into its dual problem;The semi-positive definite programming form of dual problem is deduced;Dual polynomial is constructed, and the wave direction estimation result is obtained by spectral peak search.In addition, the application fully utilizes the virtual differential common array of sparse array to provide extended degrees of freedom and all information, and suppresses the influence of array element amplitude-phase error by defining new atom norm, solves the mesh mismatch problem caused by parameter domain discretization, and obtains high-precision meshless direction estimation result.

The invention belongs to the technical field of catalysts, and particularly relates to a bifunctional catalyst for hydro-conversion and deoxidation of organic sulfur in feed gas and a preparation method of the bifunctional catalyst. The catalyst comprises a carrier, an active component I, an active component II, an active aid, a release agent and a pore forming agent. The carrier is modified in a coprecipitation mode, and the negative effects of high-temperature sintering, structural damage and the like are inhibited. The acid and the active auxiliary agent which can interact with the active component are added, so that activity reduction caused by relatively strong acting force between the active component and the carrier and embedding of the active component into a carrier crystal lattice is avoided, and the hydrodesulfurization and deoxidation performance of the catalyst is improved. The pore-forming agent is introduced in the preparation process, so that a rich pore structure can be constructed, the reaction active sites and the diffusion rate of macromolecular organic sulfur on the surface of the catalyst are increased, and the technical problems of pore blockage, catalyst deactivation and the like caused by carbon deposit are effectively solved.

The utility model relates to the field of bras, and discloses a breathable traceless chest pad which comprises a chest pad body, the side, close to the chest of a user, of the chest pad body is an inner surface, and the side, away from the chest of the user, of the chest pad body is an outer surface; a plurality of air holes are formed in the inner surface of the chest pad body and extend towards the direction of the outer surface to form an air-permeable unit, and the air holes are of a hexagonal structure; a plurality of connecting holes are formed in the outer surface of the chest pad body and extend in the direction of the inner surface to form a connecting unit, the connecting holes are of a conical structure, and at least part of the connecting holes of the connecting unit are communicated with the air holes; at least one magnetic therapy position is arranged on the inner surface of the chest pad body along the circumferential side of the chest pad body, an opening is formed in the upper portion of the magnetic therapy position, and a magnetic therapy body is placed in the magnetic therapy position through the opening. According to the scheme, through the honeycomb-shaped ventilation units, the hole diameter of the ventilation holes is increased, the chest pad body is lighter and thinner, the ventilation effect of the chest pad is better, and perspiration is facilitated.

The invention provides an MOR molecular sieve membrane and a preparation method thereof.The preparation method of the MOR molecular sieve membrane comprises the following steps that S1, an aluminum source, alkali liquor, a silicon source, villiaumite, organic alcohol and water are mixed, and synthetic sol is obtained; s2, coating the surface of the porous carrier with a seed crystal liquid to obtain a seed crystal layer; s3, coating the synthetic sol on the surface of a seed crystal layer, and carrying out three times of variable-temperature crystallization to obtain an MOR molecular sieve membrane; in the step S1, the molar ratio of the SiO2 to the Na2O to the Al2O3 to the ROH to the NaF to the H2O is 1 to (0.1 to 0.35) to (0.03 to 0.15) to (0.2 to 2) to (0.1 to 0.5) to (10 to 100). The organic alcohol is added, so that the crystallinity of the MOR molecular sieve membrane structure and the integrity of the whole structure are improved.

The invention relates to a preparation method of a low-carbon alcohol adsorbent, and belongs to the technical field of adsorbents. The preparation method comprises the following steps: (1) preparing an alkaline solution, wherein the mass ratio of inorganic base to acid salt to water in the solution is 1: (0.1-10): (10-300); (2) mixing a high-silicon ZSM-5 molecular sieve with the alkaline solution prepared in the step (1) according to a solid-to-liquid ratio of 1: (1-15), and stirring at 25-95 DEG C for 0.5-5 hours; filtering and washing with water to obtain a product 1; (3) adding the product 1 into a vulcanizing solution, stirring and reacting at 25-115 DEG C for 0.5-5 hours, washing with water, and filtering to obtain a product 2; (4) adding a binder, an acidic solution and water into the product 2, and carrying out extrusion molding to obtain a product 3; and (5) roasting the product 3 at 500-1000 DEG C for 0.5-5 hours to obtain the low-carbon alcohol adsorbent. According to the invention, the pore volume and the pore diameter are increased, so that the low-carbon alcohol adsorption capacity is improved; through vulcanization, the hydrophobic capacity of the molecular sieve is enhanced, and the lipophilicity of the molecular sieve is improved; the problem that the ZSM-5 type molecular sieve is poor in adsorption is solved.

The invention discloses an underwater buried target electrical imaging method, and belongs to the field of underwater buried target detection imaging. The method comprises the following steps: firstly, preparing a detection device which comprises two rows of receiving and generating electrodes, then obtaining an array flow pattern and a flow pattern matrix, and then carrying out matrix scanning on a detection area where a buried target object is located by using the detection device to obtain a received signal matrix; and then obtaining a target width value and a position corresponding to each row of the received signal matrix through spatial spectrum estimation and sliding window scanning, and finally performing inversion imaging based on the width values and the positions. According to the invention, a virtual electrode array is formed based on two pairs of mobile receiving and generating electrodes, and the system has the advantages of low system complexity, low cost, high imaging speed, high accuracy and the like.

The invention discloses a silicon oxide microsphere as well as a preparation method and application thereof. The silicon oxide microspheres are large-aperture silicon oxide microspheres, the specific surface area is 395-750m < 2 > / g, the pore volume is 1.0-3.5 ml / g, and the average aperture is 17-50nm. The silicon oxide microspheres have the characteristics of large specific surface area, large pore volume and large pore diameter, and the catalyst prepared by using the silicon oxide microspheres as the carrier has the advantage that the activity is remarkably improved when the catalyst is applied to olefin polymerization reaction.

The present invention relates to the technical field of metal organic framework materials, and discloses a metal organic framework material having a sulfonyl benzene ring structure, a preparation method and application thereof, and a method for esterification of carboxylic acids. The ligand of the metal organic framework material is provided by a substance having a structure as shown in formula (1), and the coordination metal M is selected from one of Zr, Cr and Al; in formula (1), M' is selected from one of H, Li, Na, K, Cs, Ca and Mg. The metal organic framework material provided by the present invention has excellent specific surface area, pore volume, pore diameter and acid density, and when used in esterification reactions, especially esterification reactions of carboxylic acids and alcohols, it can effectively improve the esterification rate of carboxylic acid esterification reactions. It has broad application prospects.

The application belongs to the technical field of lithium batteries, and relates to a preparation method of a double-coated silicon-carbon composite material, an electrode and a lithium battery.The method comprises the following steps: placing a lithium dopant and a MOF material in a first organic solvent, adding a template agent and a catalyst, reacting, filtering, freeze-drying and obtaining a gel composite; in an inert atmosphere, the gel composite is heated to a first preset temperature, carbon dioxide is introduced at a preset flow rate, the temperature is lowered, the gel composite is soaked in mixed acid, pickling is performed, vacuum drying is performed, and a porous carbon composite material is obtained; liquid silane, a phosphine derivative, a dispersing agent, the porous carbon composite material and a silane coupling agent are added to a second organic solvent, spray drying is performed, primary carbonization is performed, and a silicon-carbon precursor material is obtained; resin is dissolved in a third organic solvent, a fast ion conductor and the silicon-carbon precursor material are added, secondary carbonization is performed, the temperature is lowered to a second preset temperature, a reducing gas is introduced, and a double-coated silicon-carbon composite material is obtained; the conductivity is improved, the interface stability is improved, and the full charge swelling is reduced.