1846 results about "Aqueous dispersion" patented technology

The invention belongs to the technical field of separation membrane materials, and provides a covalent organic framework membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an organic phase solution containing a polyaldehyde monomer and a water phase solution containing a polyamine monomer; dropwise adding the organic phase solution to the aqueous phase solution for reaction, and dialyzing the solution after the reaction is finished to obtain a purified aqueous dispersion of the covalent organic framework nanosheet; and dispersing the aqueous dispersion, carrying out suction filtration to a hydrophilic support, and carrying out heat treatment and curing. The invention also discloses the covalent organic framework membrane prepared according to the method and application thereof. The covalent organic framework membrane is used for removing divalent ions in a saline solution. The covalent organic framework membrane disclosed by the invention has an ordered pore structure with a specific size and high ion selectivity; due to the strong covalent bond connection characteristic, the covalent organic framework film is endowed with acid and alkali resistance and high stability; the preparation method disclosed by the invention is simple, mild in condition and wide in application range.

The invention discloses a pure bio-based polyhydroxyalkanoate adhesive as well as preparation and application thereof, and belongs to the technical field of degradable adhesives. According to the adhesive, polyhydroxybutyrate valerate or polyhydroxybutyrate hexanoate is used as a matrix, and the acid value reaches 2-15 mg KOH / g through molten end group activation; a reactive emulsifier with a hydrophilic-lipophilic balance value of 9-12 is introduced into a water phase, and the stable aqueous dispersion is prepared through phase inversion high-shear emulsification. The Z-average particle size of the dispersion is 0.12-0.30 [mu] m, and the content of the free surfactant is not higher than 30wt%. After the tackifying resin, the plasticizer and the vegetable wax are compounded, the bio-based carbon content of the obtained adhesive is not lower than 95%, and the volatile organic compound content is not higher than 100 mg / kg. The paper / paper heat sealing strength of the adhesive is not lower than 7.0 N / 15mm, the 180-degree peel strength is not lower than 7.5 N / 25mm, and the adhesive can pass repulping evaluation.

A production method for an aqueous dispersion according to the present invention comprises polymerizing a first monomer that includes tetrafluoroethylene in the presence of a compound represented by formula (X) and a polymerization initiator under conditions in which an aqueous medium is present but an emulsifier that includes fluorine atoms is substantially absent to produce an aqueous dispersion that includes particles of a first fluorine-containing polymer that has an average particle diameter of no more than 500 nm and does not have a melting point.　Formula (X): C(X1)(X2)=C(X3)-L-Z. In formula (X), X1, X2, and X3 are each independently a hydrogen atom, a fluorine atom, a perfluoromethyl group, or an alkyl group, L is a single bond or a divalent linking group, and Z is an anionic group or a salt of an anionic group.

The present invention relates to the technical field of water-based coatings, and specifically to a PHA water-based coating, a preparation method and application thereof. The PHA water-based coating comprises the following raw materials: a PHA water-based dispersion, an emulsifier, a thickener, a film-forming aid and a leveling agent; wherein the PHA water-based dispersion is obtained by a PHA fermentation broth through a wall-breaking treatment. The present invention directly prepares the PHA water-based coating by using the PHA water-based dispersion obtained by fermentation and wall-breaking treatment upstream, and can prepare a PHA water-based coating that is not easy to settle, has good storage stability, is uniformly dispersed and has a small particle size.

The invention discloses a positive electrode material for a zinc-bromine flow battery and a preparation method and application thereof, and belongs to the technical field of zinc-bromine flow batteries, the preparation method comprises the following steps: crushing and sieving an active carbon source, adding the active carbon source into a graphene oxide aqueous dispersion, stirring, centrifuging, removing supernate, drying, mixing with an activating agent, and activating in an inert atmosphere; washing to be neutral, drying and sieving to obtain a graphene / activated carbon composite material; and attaching the graphene / activated carbon composite material to a carbon-plastic bipolar plate to obtain the positive electrode material for the zinc-bromine flow battery. A graphene / activated carbon composite system is combined with a high-conductivity network, graded holes and surface functional groups, so that the reaction kinetics bottleneck of a traditional carbon material Br2 is broken through.

The invention discloses a SnO2 / SnS2 / AgS nano material with piezoelectric electro-catalytic tooth whitening and sterilizing performance and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dripping a silver nitrate aqueous solution into a prepared SnO2 / SnS2 nano material aqueous dispersion, carrying out hydro-thermal treatment for 2 hours, centrifuging, washing and drying to obtain a SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nano material; (2) food indigo is adopted to simulate tooth surface pigments, piezoelectric electro-catalytic degradation is carried out by using the SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nanomaterial, and the pigment degradation efficiency can reach 95% or above; (3) the SnO2 / SnS2 / Ag2S heterojunction nanomaterial is used for piezoelectric electro-catalysis treatment of the streptococcus mutans pellicle, and the antibacterial rate of the pellicle can reach 90% or above; and (4) compared with a 3% H2O2 aqueous solution for treating the enamel surface structure, the SnO2 / SnS2 / Ag2S nano-material piezoelectric electro-catalysis treatment of teeth has small damage to the enamel surface structure. According to the invention, more nano materials with tooth whitening and sterilizing performance and the preparation method thereof are provided, so that the problems of single variety, single preparation method, low electron-hole separation efficiency and large side effect of the existing tooth whitening and sterilizing nano materials are solved.

The invention discloses a pure bio-based PHA aqueous dispersion as well as a preparation method and application thereof, and belongs to the technical field of pure bio-based polymer aqueous dispersion. According to the dispersion, polyhydroxyalkanoate is used as a unique film forming matter, Pickering solid particles and a natural surfactant are adopted for synergistic stabilization, and a bio-based plasticizer can be selected. The emulsion or slurry with the polyhydroxyalkanoate content of 40-85wt% and the particle size of 0.2-3m is prepared through a melting high-pressure homogenization method, a low-temperature wet grinding method or a solvent replacement method. The coating does not contain petrochemical polymer protective colloid and perfluorinated and polyfluoroalkyl substances, and the bio-based content is greater than or equal to 99%. Due to the excellent stability, rheological property and film-forming property of the modified starch, the modified starch becomes an ideal basic material for constructing a multi-layer programmable controlled release and degradation functional coating system, can be used in the fields of paper-based barrier coatings, adhesives, advanced crop seed coats and the like, realizes excellent barrier, bonding and controlled release properties, meets the industrial compost and repulping property standards, and has wide application prospects. The method has green, environment-friendly and industrial potential.

The invention provides a PHA dispersion emulsion as well as a preparation method and application thereof, and belongs to the field of high polymer materials. The invention aims to solve the technical problem that the prior art cannot simultaneously meet the requirements of the polyhydroxyalkanoate water dispersion system on extremely low temperature natural film-forming property, excellent comprehensive performance after film formation and long-term storage stability. The method is characterized in that a polyhydroxyalkanoate polymer with specific molecular weight and polydispersity index range, a coalescing agent 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate with a specific chemical structure and a specific type of aliphatic polyisocyanate cross-linking agent compatible with water dispersion are strictly limited and combined. Through the synergistic effect generated by the unique ternary combination, the minimum film forming temperature of the prepared emulsion can be reduced to 6-10 DEG C, a film can be naturally formed without hot pressing, and the formed film has excellent mechanical property, water resistance and adhesive force and has excellent storage stability of at least one year.

The invention provides a supramolecular hydrogel packer constructed by interaction of a subject and an object as well as a preparation method and application of the supramolecular hydrogel packer, and belongs to the technical field of drilling fluid packing. The supramolecular hydrogel packer constructed by interaction of the subject and the guest comprises the following raw materials in percentage by mass: 12-36% of a copolymerization monomer, 6-10% of a tannic acid grafted polysaccharide aqueous dispersion, 0.5-1.5% of an initiator, 0.3-0.6% of a cross-linking agent and the balance of water, the total amount of the components is 100%. The raw materials are cheap, easy to obtain, simple in composition, low in cost, green, safe and environment-friendly; the preparation method is simple, mild in condition and easy to implement. After crosslinking, the obtained packer has excellent mechanical properties, temperature and pressure resistance and outstanding pH degradation capability, and can effectively pack a crude oil reservoir to form an integral sealing interlayer, so that heavy oil entering a shaft is reduced; meanwhile, degradation of the hydrogel can be effectively realized, and deblocking is achieved.

Provided are: a multilayer carbon nanotube assembly having high conductivity; a multilayer carbon nanotube dispersion liquid; a conductive material; an electrode; a secondary battery; a planar assembly; a filter; an electromagnetic wave shield; and a pellicle for extreme ultraviolet rays.　Provided are: a multilayer carbon nanotube assembly including a multilayer carbon nanotube that has a median diameter of 80 nm or more in a volume-based particle size distribution obtained by a centrifugal sedimentation method when measured as an aqueous dispersion liquid at a concentration of 0.004% by mass, and has a rate of change in transmittance measured by a centrifugal sedimentation method of 0.3% or less per hour when measured as an aqueous dispersion liquid at a concentration of 0.2% by mass; a multilayer carbon nanotube dispersion liquid; a conductive material; an electrode; a secondary battery; a planar assembly; a filter; an electromagnetic wave shield; and a pellicle for extreme ultraviolet rays.

The invention discloses a preparation method and application of polyvinyl alcohol assisted molded aramid nanofiber aerogel. The preparation method of the aerogel comprises the following steps: pulping aramid pulp, homogenizing and centrifuging to obtain an aramid nanofiber aqueous dispersion; dissolving polyvinyl alcohol in deionized water to obtain a polyvinyl alcohol aqueous solution; and mixing the aramid nanofiber aqueous dispersion and the polyvinyl alcohol aqueous solution, placing the mixture in a container, and carrying out liquid nitrogen unidirectional freezing, freeze drying and low-temperature heat treatment to obtain the aerogel. According to the aerogel prepared by the method, due to the physical winding effect of a polyvinyl alcohol polymer chain and the chemical combination effect of a hydrogen bond, dispersion of the aramid nanofiber in a water-based solvent is synergistically promoted; therefore, the phenomena of agglomeration and adhesion, non-uniform forming, slag and powder falling and the like caused by Van der Waals interaction, hydrophilic and hydrophobic interaction and the like among the adjacent aramid nanofibers in the freezing casting process are avoided; the aramid nanofiber in the aerogel subjected to low-temperature heat treatment is close to single distribution, and a viscous polyvinyl alcohol molecular chain is converted into a conjugated carbon chain, so that the mechanical properties of compression, stretching and the like of the aerogel are remarkably improved. In addition, the aerogel can be used as a wave-absorbing material after being carbonized at a high temperature, has the advantages of thin thickness and light weight, and has the wave-absorbing capability of wide frequency band and strong absorption.

A method for producing a fluoroelastomer is provided by which a fluoropolymer having excellent dispersion stability in water can be efficiently produced using an aqueous medium having a reduced environmental burden and without essentially requiring an emulsifier.　The method for producing a fluoroelastomer comprises polymerizing monomers including TFE and PAVE in an aqueous dispersion that contains substantially no water-soluble emulsifier and comprises an aqueous medium and a first fluoropolymer, which includes TFE units and PAVE units, thereby producing a second fluoropolymer. In the first fluoropolymer, the proportion of the PAVE units to the sum of the TFE units and the PAVE units is 20-95 mol%. In the second fluoropolymer, the proportion of PAVE units to the sum of TFE units and the PAVE units is 20-95 mol%. Before initiation of the polymerization of the monomers, the content of the first fluoropolymer is 0.01-4.0 mass% with respect to the mass of the whole aqueous dispersion.

The invention discloses a gas-sensitive material for monitoring an environment-friendly gas characteristic substance CO as well as a preparation method and application thereof, and relates to the technical field of gas-sensitive materials. The preparation method comprises the following steps: dissolving tin tetrachloride pentahydrate, sodium hydroxide and polyvinylpyrrolidone, adding ammonium fluoride, reacting at 155-165 DEG C, drying the product, and calcining at 295-305 DEG C to obtain SnO2 nanoparticles; the preparation method comprises the following steps: performing ultrasonic mixing on SnO2 deionized water dispersion liquid and MoS2 nanosheet ethylene glycol dispersion liquid, and then drying to obtain the MoS2 / SnO2 composite material with a mesoporous hollow nanotube structure, and the volume ratio of ethylene glycol to deionized water is (0.9-1.1): 1. The MoS2 / SnO2 gas sensitive material has the advantages of low density, high pore volume, large specific surface area, high structural stability and the like. And when applied to a CO resistive sensor, the catalyst has good CO selectivity, high sensitivity and good long-term stability.

The invention discloses a PHA-acrylic acid structural unit water-based dispersion based on interface engineering regulation and control, a preparation method thereof and application of a paper-based barrier coating, and belongs to the technical field of high polymer materials, interface engineering and water-based coatings. The stable interface layer is constructed in situ between the crystalline PHA and the acrylic resin through the amphiphilic polymer, so that the problems of poor compatibility and film forming defects of a bio-based material are effectively solved. The dispersion can realize excellent waterproof, oil-proof and gas barrier effects by only needing a relatively low coating weight, and the material consumption is remarkably reduced. The unique gradient structure of the coating has excellent mechanical adhesive force and efficient re-pulping and recycling characteristics, and the technical defect that a traditional barrier coating is difficult to recycle is overcome. And an ideal solution with high performance and high safety is provided for green packaging.

The invention discloses a bio-based PHA oil-resistant and moisture-permeable coating for hamburger paper, coated paper and a preparation method, and belongs to the technical field of bio-based high polymer materials and paper-based food packaging. The coating is a PHA aqueous dispersion, and mainly comprises a semi-crystalline matrix PHA and a low-crystallinity or amorphous toughening PHA. The core of the coating is that after the coating is dried to form a film, a functional gradient structure can be spontaneously formed in the thickness direction of the coating: an interface layer close to a paper base is rich in toughening PHA so as to enhance toughness and adhesive force; and the surface layer of the coating is rich in matrix PHA so as to maximize the oil resistance. By means of the functional gradient structural design, the packaging material integrates oil resistance, moisture permeability and flexibility of the packaging material, has the degradable environment-friendly characteristic and is suitable for packaging high-grease food.

An aqueous dispersion including a binder resin, a nonionic surfactant, and a wax component, wherein the content of the nonionic surfactant is 0.1 to 200 parts by mass based on 100 parts by mass of the binder resin, and 2 parts by mass or more based on 100 parts by mass of the wax component.

The present invention relates to a composition comprising an aqueous dispersion of biodegradable polymer particles, a method of preparing the composition, and a method of preparing a coated substrate comprising the composition. The composition is useful as a coating applied to a substrate, particularly a paper substrate. The coated paper is useful as a single layered barrier coated paper or paperboard.

Provided is a polyurethane resin composition capable of forming a coating that has high mechanical strength and solvent resistance and that also has scratch resistance and blocking resistance. In a composition containing a polyurethane resin, the polyurethane resin has a structural unit derived from a polyol, a structural unit derived from a polyisocyanate, and a structural unit derived from a polyamine, and the polyol includes a polycarbonate polyol having a structural unit derived from 1,10-decanediol, a polyol compound having an anionic hydrophilic group, a glycol compound represented by HO-(R1-O)n-H, and a polyhydric alcohol having three or more hydroxy groups. The glycol compound has a number-average molecular weight of 500 to 2,500, the polyhydric alcohol is included in an amount of 10% by mass or less relative to a total mass of the polyol, and the glycol compound is included in an amount of 30% by mass or more and 90% by mass or less relative to the total mass of the polyol.

The present invention relates to a composition comprising an aqueous dispersion of polymer encapsulated TiO2 composite particles and an organic matting agent, as well as a method for making the composition. The composition of the present invention is useful for coating compositions to improve mar resistance of coatings.

The invention discloses a cellulose paper-based diaphragm for a zinc-iodine battery as well as a preparation method and application of the cellulose paper-based diaphragm. The diaphragm is of a three-layer composite structure and comprises a matrix layer formed by paper pulp fibers such as softwood pulp, hardwood pulp, bamboo pulp or straw pulp through a wet papermaking technology, and compact functional layers which cover the two sides of the matrix layer and are formed by oxidized nanocellulose (TOCN). The preparation method mainly comprises the following steps: preparing the paper-based diaphragm matrix through wet papermaking, coating the two sides of the paper-based diaphragm matrix with TOCN aqueous dispersion, and finally carrying out hot-pressing drying treatment to enable the three layers to be tightly combined. According to the invention, the nano aperture and the surface negative electricity functional group of the TOCN layer are utilized, so that physical blocking and electrostatic repulsion of polyiodide ions can be realized at the same time, and the shuttle effect is effectively inhibited; and the uniform pore channels can guide zinc ions to uniformly deposit and inhibit dendritic crystal growth. The diaphragm is green in raw material, simple in process and low in cost, and the cycle life and coulombic efficiency of the battery can be remarkably improved when the diaphragm is applied to the zinc-iodine battery.

The present invention provides a highly elastic polyurethane-polyurea aqueous dispersion and a preparation method and application thereof, wherein the polyurethane-polyurea aqueous dispersion comprises a combination of chain extenders such as polyether polyol, polyester polyol and triazole. The soft elastic product prepared based on the polyurethane-polyurea aqueous dispersion provided by the present invention has elasticity and chemical resistance comparable to latex gloves.

The invention discloses an antiskid sewage-resistant waterborne coating and a preparation method thereof, and relates to the technical field of tableware coatings. The water-based paint comprises a liquid A and a liquid B, the liquid A comprises the following components in parts by weight: 35-60 parts of emulsion type organic silicon aqueous dispersion resin; 3 to 10 parts of maleic anhydride grafted polypropylene wax emulsion; 5-10 parts of an elastomer modified acrylic dispersion; 0.5 to 1.2 parts of a dispersant; 1-3 parts of a thickening agent; 3-8 parts of a nanoscale aluminum oxide dispersion liquid; 15-25 parts of a water-based color paste; 0.3-1 part of an emulsifying ripple auxiliary agent; 0.1-1 part of a substrate wetting agent; 0.1 to 1 part of a defoaming agent; 3-5 parts of deionized water; the liquid B comprises the following components in parts by weight: 90-100 parts of a water-based isocyanate curing agent, 0.3-0.8 part of a dehydrating agent, 5-8 parts of an adhesion promoter and 2-5 parts of a coalescing agent. The invention provides an innovative two-component water-based paint system, through the synergistic effect of the components after the liquid A and the liquid B are mixed, the multiple requirements of tableware or catering auxiliary appliances on the skid resistance, stain resistance, adhesive force and environment friendliness of the coating are comprehensively met, and the coating completely meets the high-standard requirements of food contact materials.

The invention relates to an aqueous polyolefin dispersion having a pH value from 8.6-12.5 containing a. from 50 to 100 wt. % of an aqueous dispersion A comprising the following ingredients: i. from 31 to 90 wt. % of A1, a copolymer of ethylene and (meth)acrylic acid having a content of (meth)acrylic based groups of at least 11 wt. % based on the total weight of the copolymer or a mixture of different copolymers of ethylene and (meth)acrylic acid each having a content of (meth)acrylic based groups of at least 11 wt. % based on the total weight of the copolymer, ii. from 10 to 69 wt. % of A2, another olefinic stricture units containing polymer, not being a copolymer of ethylene and (meth)acrylic acid, or a mixture of other olefinic structure units containing polymers not being a copolymers of ethylene and (meth)acrylic acid, and iii. from 0-35 wt. % of additive different from A1 and A2, b. from 0 to 50 wt. % of other ingredient(s) B, where compound B is a material dispersible or soluble in water and different from any of the ingredients of dispersion A wherein—the wt. % of A and B is based on the solid content of the whole aqueous polyolefin dispersion,—the wt. % of the ingredients of dispersion A is based on the solid content of dispersion A.—the sum of the wt. % of ingredients i to iii of dispersion A is 100% and wherein the pH of the dispersion is in the range of 9.5 to 11 and / or the dispersion contains, as an ingredient of B, more than 5 and less than 35 wt. % of PEG, based on the solid content of the whole aqueous dispersion.

The invention discloses a tannic acid modified titanium carbide / silver nanowire / aramid nanofiber electromagnetic shielding composite film and a preparation method and application thereof.The preparation method comprises the steps that titanium aluminum carbide powder is added into a mixed solution of lithium fluoride and hydrochloric acid, stirring reaction is performed, ultrasonic treatment is performed to prepare an MXene aqueous dispersion, tannic acid is added into the MXene aqueous dispersion, stirring reaction is performed, and the tannic acid modified titanium carbide / silver nanowire / aramid nanofiber electromagnetic shielding composite film is obtained. Stirring and reacting at room temperature to prepare an MXene-TA dispersion liquid; the preparation method comprises the following steps: dissolving potassium hydroxide and para-aramid chopped fibers in dimethyl sulfoxide, and stirring to obtain an aramid nanofiber dispersion liquid; and the tannic acid modified titanium carbide / silver nanowire composite electromagnetic shielding composite film is prepared from the MXene-TA dispersion liquid, the AgNWs dispersion liquid and the aramid nanofiber. The electromagnetic shielding composite film prepared through the method is not prone to oxidation and good in mechanical performance, and the use stability of an electromagnetic shielding material is effectively improved.

The invention discloses three-dimensional reticular porous MOFs / MXene cellulose composite aerogel as well as a preparation method and application thereof, and belongs to the technical field of aerogel. The preparation method comprises the following steps: adding divalent metal salt into an MXene aqueous dispersion to obtain a mixed dispersion I; sequentially adding the mixed dispersion liquid I and a borax aqueous solution into the mixed dispersion liquid of cellulose nanofibers and polyvinyl alcohol under a heating condition, stirring and dispersing, cooling, and freeze-drying to obtain double-crosslinked network aerogel; the preparation method comprises the following steps: preparing a bi-crosslinked network aerogel, immersing the bi-crosslinked network aerogel into a solution containing imidazole ligands for an in-situ reaction, and then washing and drying to obtain the three-dimensional network porous MOFs / MXene cellulose composite aerogel which has high MOFs loading capacity and excellent stability, can realize efficient adsorption of antibiotics, and is simple in preparation method and suitable for large-scale production.

The present invention relates to a composition comprising an aqueous dispersion of biodegradable polymer particles, a method of preparing the composition, and a method of preparing a coated substrate comprising the composition. The composition is useful as a coating applied to a substrate, particularly a paper substrate. The coated paper is useful as a single layered barrier coated paper or paperboard.

The invention relates to the technical field of porcelain glaze, and discloses a preparation method for combining porcelain glaze of a carbon nano tube enhanced glass-lined reaction kettle, which comprises the following steps: firstly, preparing a carbon nano tube aqueous dispersion, slowly dropwise adding the carbon nano tube aqueous dispersion into a surfactant solution to obtain a positively charged carbon nano tube aqueous dispersion, adding glaze powder into a negative ion solution, and uniformly stirring to obtain the carbon nano tube enhanced glass-lined reaction kettle porcelain glaze. And fully mixing the glaze particles with negative charges to obtain glaze slip, carrying out centrifugal filtration to obtain preliminarily modified glaze particles, carrying out gradient pre-heating in an aerobic environment to obtain pre-calcined glaze particles, placing the pre-calcined glaze particles in calcination equipment, carrying out oxygen-isolated calcination, and in order to discharge pores in the sintered glaze particles, raising the temperature in the furnace again to enhance the fluidity of the glaze particles. The preparation method comprises the following steps: preparing a glaze block, preparing a vacuum environment by using a vacuum pump, recovering to a normal-pressure environment, stopping heating to obtain the glaze block with tightly combined inside, and finally grinding and crushing the glaze block in grinding equipment with the particle size capable of being adjusted according to downstream application requirements.

The invention provides composite cosmetic powder with water resistance and skin fitness and a preparation method thereof.The composite powder comprises titanium dioxide, amino acid, natural vegetable oil and synthetic grease, the preparation method comprises the steps that firstly, titanium dioxide powder is added into deionized water to be prepared into 40% aqueous dispersion, an amino acid solution is added to form reaction liquid, and the reaction liquid is added into the deionized water; adjusting the pH value of the reaction liquid to 7-8 so as to coat the hard amino acid; aging, filtering, washing, drying and crushing the reaction liquid to obtain composite modified titanium dioxide powder; adding the composite modified titanium dioxide powder into a high-speed mixer, and sequentially adding synthetic grease and natural vegetable oil along with the operation of the mixer; the composite cosmetic powder is obtained through drying and smashing, and the powder prepared through the proportion and the method has excellent adhesive force and spreadability, proper covering power, a good soft coke effect, prominent water resistance and water resistance and a good makeup maintaining effect.

The invention provides an MXene-derived skeleton composite phase-change material with strong electromagnetic shielding performance, which is a composite phase-change material with a stable shape, which is obtained by taking MXene-derived aerogel as a skeleton material and carrying out vacuum impregnation and adsorption on a molten phase-change material. Wherein the MXene-derived aerogel is an aerogel-based framework material obtained by adding chitosan quaternary ammonium salt, polyethyleneimine and carbon nanotubes into an MXene aqueous dispersion, uniformly dispersing to obtain a mixed solution, directionally and rapidly freezing in liquid nitrogen, carrying out vacuum freeze drying and carrying out high-temperature carbonization. The composite phase change material not only has high thermal conductivity and high latent heat, but also has an EMI (Electro-Magnetic Interference) shielding function and electric heating, photo-thermal and magnetic-thermal conversion capabilities, the highest thermal conductivity is 0.64 W / m.K, the EMI shielding effectiveness is up to 38.28 dB, and the composite phase change material has wide application prospects in electric heating, photo-thermal, magnetic heating, energy storage and electronic equipment thermal management.

The invention provides a graphene / oxide composite metal lithium negative electrode with a laminated pore cavity microstructure, zero deformation and full sealing as well as a preparation method and application of the graphene / oxide composite metal lithium negative electrode. The preparation method of the negative electrode comprises the following steps: drying a GO aqueous dispersion to prepare a GO film; carrying out reduction reaction on the GO thin film to obtain an rGO thin film; loading oxides on the surface and in the rGO thin film to obtain an oxide composite rGO thin film; and loading metal lithium on the oxide composite rGO film. The laminated pore cavity microstructure in the negative electrode material is the key for changing the working principle of the metal lithium negative electrode, and lithium is limited in the laminated pore cavity to be deposited and stripped by the structure, so that interface fracture caused by volume change is avoided; the two-dimensional continuous rGO composite inorganic oxide completely prevents electrolyte from permeating and corroding lithium metal; 99.99%-99.999% of lithium deposition stripping efficiency of 2000 circles in the lithium metal battery is realized for the first time, and the method has a great application prospect.