948 results about "Vinyl fluoride" patented technology

The invention discloses a glue solution for a copper-clad plate and a preparation method of the glue solution, and relates to the technical field of copper-clad plates. According to the prepared glue solution for the copper-clad plate, the composite epoxy resin, the curing agent, the accelerant, the solvent, the flexibilizer and the inorganic filler, the composite epoxy resin comprises bisphenol A epoxy resin, epoxy phenyl polysiloxane, itaconic acid polyaryletherketone and hydroxyl-terminated fluorine-containing vinyl polysiloxane, so that the interface bonding force with the copper plate is enhanced; the dielectric constant and the dielectric loss are effectively reduced, the peel strength and the toughness of the material are also remarkably improved, and the toughening agent is modified polyether sulfone microspheres; the modified polyethersulfone microspheres are prepared by coating polyethersulfone microspheres with hexamethylenediamine tetrapropionamide diamine, the hexamethylenediamine tetrapropionamide diamine is prepared by carrying out acylation condensation reaction on hexamethylenediamine tetramethyl propionate and ethylenediamine, and the polyethersulfone microspheres are prepared by carrying out electrostatic spinning on a spinning solution of polyethersulfone and vinylpyridine, so that the peel strength of the glue solution is remarkably improved.

The invention belongs to the technical field of refrigerants, and provides a mixed refrigerant for replacing R290 and a preparation method and application thereof, the mixed refrigerant comprises a first component, a second component and a third component; the first component is trans-1, 2-difluoroethylene, the second component is 2, 3, 3, 3-tetrafluoropropene, and the third component is trifluoromethyl methyl ether; compared with R290 refrigerants in the prior art, the mixed refrigerant has the advantages that flammable and explosive components do not exist, and high-risk combustible gas clusters cannot be formed due to density layering after leakage, so that the mixed refrigerant has high safety performance, and the safety level can be not lower than A2L; the mixed refrigerant has the environment-friendly characteristic of low GWP, the GWP is smaller than or equal to 150, and the environment-friendly requirement is met; the thermophysical property and the refrigeration and / or heating cycle performance of the mixed refrigerant are similar to or better than those of R290; the mixed refrigerant can be used for directly replacing an R290 refrigerant.

The invention relates to the field of electromagnetic functional composite materials, and particularly discloses a multi-layer composite structure flexible frequency selective surface material and a preparation method thereof. The ultra-high molecular weight polymer fiber-reinforced polymer-based composite material thin-film mechanical enhanced band-pass frequency selection array sequentially comprises an acrylic acid polyvinylidene fluoride organic polymer coating environment-resistant layer, a metal oxide organic film isolation layer, an ultra-high molecular weight polymer fiber-reinforced polymer-based composite material thin-film mechanical enhanced layer, a band-pass frequency selection layer and a packaging protection layer from top to bottom, and the band-pass frequency selection layer is a hexagonal / circular ring nested band-pass frequency selection pattern array. The packaging protection layer is formed by printing a conductive coating composed of conductive filler / polymer resin matrix, and the packaging protection layer is an ink coating. The flexible frequency selective surface material has the characteristics of light weight, high strength, salt fog / rain / ultraviolet and other severe environments, frequency selective wave transmission and multiple functions, has good gas barrier property, is beneficial to maintaining the shape of an inflatable hangar made of a skin and ensuring normal operation of radar equipment, and has good practical engineering application value.

The invention provides a diaphragm and a preparation method thereof and a lithium ion battery, the diaphragm comprises a base membrane layer and a composite functional layer, the composite functional layer comprises hydrophobic SiO2 aerogel modified by a hydrophobic agent, a conductive ion polymer and a solid electrolyte, and the composite functional layer respectively accounts for 3-12wt%, 0.5-1.0 wt% and 0.5-1.5 wt% of the total mass of the diaphragm; the hydrophobic agent comprises trimethylchlorosilane, hexamethyldisilazane, perfluorooctyltriethoxysilane, polyvinylidene fluoride, polydimethylsiloxane and the like, the conductive ionic polymer comprises polyvinylpyrrolidone, lithium polymethacrylate, lithium polystyrene sulfonate, polyacrylamide and the like, and the solid electrolyte comprises lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide and the like. The wettability is improved by the high porosity of the hydrophobic SiO2 aerogel, the stability and strong conductivity of a physical conductive network of the solid electrolyte and the ion affinity and amphoteric binding capacity of the conductive ion polymer are optimized, the electrochemical performance and thermal stability of the interface are optimized, and comprehensive optimization of the thermal-electric-interface performance of the diaphragm is realized through combination.

The invention relates to the technical field of architectural glass coatings, and discloses a functional coating for architectural glass and a preparation method of the functional coating. Comprising the following raw materials in parts by weight: 40-60 parts of water-based acrylic resin emulsion, 0.4-0.6 part of a defoaming agent, 5-15 parts of modified nano zinc oxide, 0.3-0.5 part of a flatting agent, 1.5-2.5 parts of a coalescing agent, 3-5 parts of a curing agent, 2-4 parts of a dispersing agent, 30-45 parts of deionized water and 3-5 parts of a thickening agent. An alternating structure formed by copolymerization of alkenyl ether (ester) and fluorine-containing ethylene is grafted on the surface of nano-zinc oxide, so that the surface of the nano-zinc oxide has fluorine-containing chain segments, and the excellent hydrophobic property of the chain segments and the antistatic capacity of the nano-zinc oxide cooperate with each other, so that the coating has super-hydrophobic property and self-cleaning capacity; the compatibility of the modified nano-zinc oxide and the coating is remarkably improved, and meanwhile, the nano-zinc oxide has a shielding effect on ultraviolet rays in long and medium wave bands, so that a coating film formed by curing the coating has excellent anti-ultraviolet performance.

The invention belongs to the field of flexible piezoelectric polymer materials, and discloses a polyvinylidene fluoride based ferroelectric polymer and a preparation method thereof. The preparation method comprises the following steps: (1) adding an inorganic alkaline reagent into a polyvinylidene fluoride-trifluoroethylene ferroelectric polymer solution, carrying out dehydrofluorination and nucleophilic addition-elimination reaction to generate a polymer with an enol structure, and then washing, precipitating and purifying a reaction product; and (2) re-dissolving by using an organic solvent, then forming a film by using a tape casting method, and carrying out ketone-enol tautomerization reaction in the film forming process of the tape casting method to finally prepare the polyvinylidene fluoride based ferroelectric polymer film. According to the effective modification and preparation method disclosed by the invention, an enol structure is promoted to be converted into a more stable ketone structure through a ketone-enol tautomerization reaction by utilizing a high-temperature environment in a film forming process, so that C = O double bonds are introduced into a polymer chain, and the piezoelectric property of the polymer is remarkably enhanced.

The invention belongs to the field of water treatment, and particularly relates to a graphene-based quinone mediator membrane as well as a preparation method and application thereof. The graphene-based quinone mediator membrane comprises a membrane matrix, and graphene, amino imidazopyridine and humus which are dispersed in the membrane matrix, the membrane substrate is made of polyvinylidene fluoride / butadiene, the polyvinylidene fluoride / butadiene is a random copolymer of polyvinylidene fluoride and butadiene, and an anthraquinone modification unit is bonded on a butadiene structural unit of the random copolymer. The graphene-based quinone mediator membrane provided by the invention has very high initial denitrification rate and over-time denitrification rate.

The embodiment of the invention provides a polymer binder, a preparation method thereof and an all-solid-state sulfide lithium battery. The polymer binder is a modified polyvinylidene fluoride-trifluorochlor oethylene copolymer, and chlorine in the modified polyvinylidene fluoride-trifluorochlor oethylene copolymer is partially or completely substituted by bromine and / or iodine; in the modified polyvinylidene fluoride-trifluorochlor oethylene copolymer, the molar ratio of a corresponding repeating unit of polyvinylidene fluoride to a corresponding repeating unit of trifluorochlor oethylene is (1-9): (9-1); in the modified polyvinylidene fluoride-trifluorochlor oethylene copolymer, the weight of chlorine is a, the weight of bromine and / or iodine is b, and b / (a + b) * 100% is equal to 1%-100%. The technical effect of improving the cycling stability and safety of the battery is achieved, and then the technical problems that when a traditional binder is applied to the all-solid-state sulfide lithium battery, the interface is unstable, the binding power is insufficient, and the traditional binder reacts with electrolyte are solved.

The invention discloses a fluororubber cloth clamping material for a V-group sealing element of a large oil cylinder and a preparation method of the fluororubber cloth clamping material. The fluororubber cloth clamping material comprises polyester cloth serving as a framework material and fluororubber compounded on the surface of the polyester cloth through a treating agent, the treating agent is a dopamine-grafted silane coupling agent KH-550, and the curing agent is a curing agent; and the fluororubber is vinylidene fluoride-hexafluoropropylene co-fluororubber. According to the invention, the problem of bonding of fluororubber and polyester cloth is solved, and the obtained fluororubber cloth clamping material has excellent water resistance and salt spray resistance in a marine environment, and can meet the high reliability requirement of a large-scale oil cylinder V-group sealing element within the service life of 20 years.

The invention belongs to the technical field of fire-extinguishing building materials, and discloses a microencapsulated efficient automatic fire-extinguishing patch and a preparation method thereof.The fire-extinguishing patch contains a fire-extinguishing microcapsule, the fire-extinguishing microcapsule is of a double-layer structure, the inner layer contains gelatin, kaolin, perfluorohexanone, sodium hexametaphosphate, resorcinol and glutaraldehyde, and the outer layer contains gelatin, kaolin, perfluorohexanone, sodium hexametaphosphate, resorcinol and glutaraldehyde; and the outer layer comprises a vinylidene fluoride-acrylic acid copolymer and glutaraldehyde. According to the invention, the flaky kaolin is used for enhancing the formaldehyde-free phenolic aldehyde inner layer and the vinylidene fluoride-acrylic acid copolymer outer layer to form a double-layer shell layer with high air tightness, so that the compactness and long-term stability of the shell layer of the microcapsule are greatly improved.

The application belongs to the field of separation and specifically relates to a cellulose / PVDF electrostatic spinning oil-water separation membrane and a preparation method thereof. The preparation method comprises the following steps: S1: preparing cellulose stearate; S2: mixing cellulose stearate obtained in step S1 and polyvinylidene fluoride (PVDF) prepared into solutions respectively to obtain a spinning solution; and S3: defoaming the spinning solution obtained in step S2 and then electrostatic spinning to obtain a cellulose stearate / polyvinylidene fluoride (PVDF) hydrophobic oleophilic oil-water separation membrane. The mixed electrostatic spinning nanofiber membrane has better mechanical properties, and due to the addition of modified cellulose, the nanofiber membrane has greater separation flux, higher separation efficiency and greater porosity.

The invention relates to the technical field of battery diaphragm preparation, in particular to a lithium ion battery diaphragm and a preparation method thereof.The lithium ion battery diaphragm comprises a diaphragm base material and modified slurry coating the surface of the diaphragm base material; a preparation method of the modified slurry comprises the following steps: adding the modified conductive polymer, the modified graphene and the vinylidene fluoride polymer into N-methyl pyrrolidone, uniformly stirring, adding vinylene carbonate, and fully stirring to obtain the modified slurry. The preparation method of the lithium ion battery diaphragm comprises the following steps: coating the modified slurry on the surface of the diaphragm base material, and flattening and curing to obtain the lithium ion battery diaphragm. The lithium ion battery diaphragm prepared in the invention has good thermal stability, can keep a stable structure in a normal working temperature range of a battery, has excellent air permeability, good diaphragm electrolyte wettability, reduced resistance, improved ionic conductivity, good capacity retention rate after long-term use, and is more durable.

The present disclosure provides a method for more efficiently obtaining HFO-1132(E) and / or HFO-1132(Z) than in conventional methods.The present disclosure specifically provides a method for producing a composition comprising trans-1,2-difluoroethylene (HFO-1132(E)) and / or cis-1,2-difluoroethylene (HFO-1132 (Z)), the method comprising:(x) supplying a starting material gas comprising 1,1,2-trifluoroethane (HFC-143), HFO-1132(E) and / or HFO-1132(Z), and a diluent gas to a reactor containing a catalyst to perform a dehydrofluorination reaction of HFC-143 and an isomerization reaction between HFO-1132(E) and HFO-1132(Z), thereby obtaining a reaction product comprising HFO-1132(E) and HFO-1132(Z), wherein the content of the diluent gas in the starting material gas is 1 to 80 mol %.

The invention discloses a self-suspension ultrahigh-intensity pressure activated phase change sealing capsule for micro-leakage control and a preparation method thereof, and belongs to the technical field of leaking stoppage materials. The preparation raw materials comprise the following components in parts by weight: 50-100 parts of latex, 50-150 parts of water, 5-20 parts of an activating agent, 5-20 parts of a crystal phase change nano reinforcing agent, 5-20 parts of a defoaming agent, 1-10 parts of nano metal oxide, 0.5-5 parts of an anti-scorching agent, 0.5-5 parts of an accelerant and 50-150 parts of a terminating agent. The crystal phase change type nano reinforcing agent comprises at least one of polytetrafluoroethylene, polyvinylidene fluoride and a copolymer of the polytetrafluoroethylene and the polyvinylidene fluoride. The obtained phase-change sealing capsule is high in plugging speed, easy and convenient to construct, low in cost and high in plugging strength, can be applied to rapid repair and control of underground tubular column micron-scale to millimeter-scale crack leakage, and solves the problems that the plugging and repairing work flow is complex, the period is long, the cost is high, the risk is large, the one-time plugging success rate is low, and hidden dangers are difficult to eradicate.

Disclosed are a separator for a secondary battery, and a secondary battery including the same, the separator including a porous substrate, an inorganic layer located on at least one side of the porous substrate, and an adhesive layer located on the inorganic layer, wherein the adhesive layer includes first vinylidene fluoride-based polymer particles and second vinylidene fluoride-based polymer particles, having different solation temperatures.

The invention relates to the technical field of sodium batteries, and discloses a preparation method of a sodium-ion battery diaphragm, the sodium-ion battery diaphragm and application, the preparation method comprises the following steps: dissolving triaminoguanidine hydrochloride in 1, 4-dioxane, and carrying out condensation reaction with hydrazine hydrate to generate triaminoguanidine chloride; performing Schiff base condensation reaction on the triaminoguanidine chloride and 2, 5-dihydroxy terephthalaldehyde to obtain a chlorine-containing covalent organic framework, and performing ion exchange on the chlorine-containing covalent organic framework to generate a fluorine-containing covalent organic framework; mixing raw materials containing the fluorine-containing covalent organic framework, polyvinylidene fluoride and N-methyl pyrrolidone, uniformly coating two sides of polypropylene with the mixture, and performing vacuum drying to obtain the sodium-ion battery diaphragm. According to the technical scheme provided by the invention, the diaphragm material capable of uniformly adjusting sodium ion transmission, reducing a desolvation potential barrier and promoting formation of a stable SEI layer can be obtained.

The invention belongs to the technical field of fluorine chemical high-purity polymer synthesis, and particularly relates to high-purity polyvinylidene fluoride resin and a preparation method and application thereof.The preparation method comprises the following steps that ultrapure water and a reactive emulsifier are added into a reaction kettle, and vacuumizing and deoxygenization are conducted till the oxygen content is smaller than or equal to 20 ppm; the preparation method comprises the following steps: heating a reaction kettle to 60-100 DEG C, introducing vinylidene fluoride until the kettle pressure is 2.0-3.0 MPa, stirring, adding an inorganic peroxide initiator, starting a polymerization reaction, after reacting for 10-20 minutes, supplementing the inorganic peroxide initiator at a constant speed, and simultaneously adding a low-boiling-point chain transfer agent at a constant speed; keeping the kettle temperature and the kettle pressure constant, and stopping the reaction when the monomer reaction dose reaches a preset weight; unreacted monomers are recycled, polyvinylidene fluoride emulsion prepared through the reaction is put into washing, drying and pelleting integrated aftertreatment equipment to be treated, and the high-purity polyvinylidene fluoride resin is obtained. The anion content, the metal ion content and the TOC content of the prepared high-purity polyvinylidene fluoride resin all meet the SEMI F57 standard requirements.

The invention discloses lithium ion diaphragm coating slurry and a preparation method and application thereof.The lithium ion battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises a dispersing agent, potassium carboxymethyl cellulose and side-chain modified polyvinylidene fluoride, and the method for preparing the side-chain modified polyvinylidene fluoride comprises the steps that vinylidene fluoride, hexafluoropropylene, (S)-4-pentene-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 3-triazole-1, 3-triazole-1, 2-triazole-1, the preparation method comprises the following steps: uniformly mixing 1, 2-diol, (S)-3-(trifluoromethyl) adipyl dichloride, an initiator, an auxiliary agent and a solvent, and reacting for 9-12 hours in an inert gas atmosphere at 75-80 DEG C under a stirring condition to obtain a reaction solution; and carrying out spray drying on the reaction liquid to obtain the side chain modified polyvinylidene fluoride. The coating slurry provided by the invention can realize firm bonding between the diaphragm and a pole piece at room temperature, improves the stability and safety of a battery structure, and remarkably reduces the internal resistance of the battery diaphragm at the same time.

The invention discloses an ultrathin battery diaphragm with high cohesiveness and safety as well as a preparation method and application of the ultrathin battery diaphragm. The battery diaphragm comprises a polyolefin base material and polyvinylidene fluoride coatings arranged on the two sides of the polyolefin base material, wherein each polyvinylidene fluoride coating comprises aluminum oxide particles, a first polyvinylidene fluoride copolymer and a second polyvinylidene fluoride copolymer; the particle size of the aluminum oxide particles is below 0.4 micron; both the first polyvinylidene fluoride copolymer and the second polyvinylidene fluoride copolymer contain vinylidene fluoride and hexafluoropropylene monomer units, and the molar percentage of the hexafluoropropylene monomer unit in the first polyvinylidene fluoride copolymer is lower than that of the hexafluoropropylene monomer unit in the second polyvinylidene fluoride copolymer. The battery diaphragm has ultra-thin thickness, has high binding power with a metal electrode plate, and is high in battery safety when being used for a battery.

The present invention relates to a composite boron powder and a preparation method thereof. The composite boron powder is prepared by a secondary condensation method using a vinylidene fluoride / propylene alcohol copolymer as a compounding agent, a polyethylene glycol monobutyl ether acrylate / acrylonitrile / allylamine / hydroxyethyl acrylate copolymer as an auxiliary compounding agent, an epoxy resin as a high-strength composite adhesive, and diethylenetriamine as a curing agent. The amounts of the components are based on the mass of the boron powder: the mass of the vinylidene fluoride / propylene alcohol copolymer is 1-2% of the mass of the boron powder, the mass of the polyethylene glycol monobutyl ether acrylate / acrylonitrile / allylamine / hydroxyethyl acrylate copolymer is 0.3-1% of the mass of the boron powder, the mass of the epoxy resin is 2-3% of the mass of the boron powder, and the mass of the diethylenetriamine is 0.15-0.4% of the mass of the boron powder.

The invention provides a core-shell structured gel polymer electrolyte and a preparation method and application thereof.The core-shell structured gel polymer electrolyte comprises a core-shell structured nanofiber, the core-shell structured nanofiber comprises a core layer and a shell layer, the core layer comprises a polyvinylidene fluoride-hexafluoropropylene copolymer and inorganic nanoparticles, and the shell layer comprises a shell layer and a polyvinylidene fluoride-hexafluoropropylene copolymer; the polyvinylidene fluoride-hexafluoropropylene copolymer and the inorganic nanoparticles are connected through a silane coupling agent; the shell layer comprises a polyacrylate polymer. The gel polymer electrolyte based on the core-shell structure solves the technical problem that the gel polymer electrolyte in the prior art is difficult to consider ionic conductivity, mechanical strength and interfacial compatibility between the electrolyte and an electrode material at the same time.

The invention discloses a polyethylene diaphragm for a lithium battery and a preparation method of the polyethylene diaphragm, and belongs to the technical field of key materials of lithium ion batteries. 8 to 12% of a polyvinylidene fluoride-hexafluoropropylene copolymer; 8-12% of a boron nitride nanotube; 5-8% of lithium lanthanum zirconium oxide; 3-5% of temperature-sensitive polymer microspheres; 2-4% of an ionic liquid; wherein the boron nitride nanotubes are BNNTs (boron nitride nanotubes), and the BNNTs are modified by a silane coupling agent KH-550, so that amino groups are introduced into the surfaces of the BNNTs. The diaphragm has temperature response closed pore protection and a three-dimensional heat conduction network, and is relatively small in thermal shrinkage rate and high in ionic conductivity; through the synergistic effect of material components and optimization of process parameters, the heat stability, mechanical strength, ionic conductivity and safety protection performance are comprehensively improved while the light and thin characteristics of a traditional polyolefin diaphragm are kept, and a key material support is provided for a high-energy-density lithium battery.

The invention provides an MXene-based binder, a tungsten-based delay powder and a preparation method, and the preparation method of the MXene-based binder specifically comprises the following steps: mixing a vinyl chloride-vinyl acetate resin solution, a polyvinylidene fluoride-hexafluoropropylene solution and an MXene suspension to obtain a mixed solution; and adding a plasticizer into the mixed solution, stirring, drying, freezing and crushing to obtain the Mxene-based binder. The preparation method of the binder system is simple, large-scale production is facilitated, and the binder system is stable in combustion, high in combustion efficiency, good in mechanical property and low in gas yield when applied to the tungsten delay powder.

The invention discloses an ultra-high molecular weight polyvinylidene fluoride-based polymer and a preparation method thereof, and belongs to the technical field of fluorine chemical industry. An emulsifier (a series of anionic fluorinated surfactants such as perfluoroalkyl carboxylic acid and salt thereof, perfluoroalkyl sulfonic acid and salt thereof, perfluoroalkyl polyether fluorocarbonic acid and salt thereof) used for fluorine-containing olefin emulsion polymerization is used as a protecting group for generating metal nanoparticles through in-situ reduction; in the emulsion polymerization reaction process, a silver salt precursor is subjected to in-situ reduction to synthesize silver nanoparticles, and then the silver nanoparticles interact with an initiator to initiate fluorine-containing olefin monomer polymerization. Through in-situ reduction, the problem that the efficiency of catalytic initiation polymerization reaction is reduced due to the fact that monodisperse metal nanoparticles are prone to aggregation for a long time is solved.

The invention discloses a coplanar parallel capacitance-piezoelectric multi-mode tactile sensor and a preparation method thereof. The coplanar parallel capacitance-piezoelectric multi-mode tactile sensor comprises a substrate, a lower electrode, a middle functional layer, an upper electrode and a packaging protection layer which are sequentially arranged from bottom to top, the middle functional layer is a high-molecular polyvinylidene fluoride (PVDF) polymer film layer; the middle functional layer is divided into a capacitance functional area and a piezoelectric functional area which are coplanar and parallel, the piezoelectric functional area is located in the middle area of the polymer film layer, and the capacitance functional area surrounds the periphery of the piezoelectric functional area; the packaging protection layer is arranged at the top of the upper electrode; different functional areas of a capacitance functional area and a piezoelectric functional area are arranged on the same film layer surface, so that a capacitance dielectric film layer and a piezoelectric functional film layer are designed to be the same film layer, in combination with an in-situ plasma polarization process, directional high-voltage polarization processing is carried out on film surfaces of different areas of the same film layer, the overall thickness of the sensor after packaging can be effectively reduced, and the packaging cost is reduced. The sensor precision is improved.

The invention discloses a preparation method of a heat-resistant, flame-retardant and electric-breakdown-resistant modified polypropylene capacitor base film. The preparation method comprises the following steps: S1, preparing composite intercalation organic montmorillonite and microcapsule type reinforced particles; s2, preparing a modified polypropylene master batch: mixing the polypropylene master batch, the composite intercalated organic montmorillonite, the microcapsule type reinforced particles, an initiator and an auxiliary agent, heating and stirring to obtain the modified polypropylene master batch; s3, adding polyvinylidene fluoride into the premix, heating and stirring, and carrying out melt extrusion on the obtained mixture; s3, cooling the casting piece; s4, biaxial stretching, heat setting, cooling and corona treatment are carried out, and the heat-resistant, flame-retardant and electric-breakdown-resistant modified polypropylene capacitor base film is obtained. The polypropylene is filled and modified through the composite intercalation organic montmorillonite and the microcapsule type reinforced particles, and the polyvinylidene fluoride is compounded and added, so that the heat resistance, flame retardance, electric breakdown resistance and mechanical strength of the polypropylene capacitor base film can be comprehensively improved.

The invention discloses a coating diaphragm and a preparation method thereof, the coating diaphragm comprises a base film, a first coating and a second coating, the first coating and the second coating are respectively located on two sides of the base film; the first coating comprises sodium carboxymethyl cellulose, a metal organic framework, a modified solid electrolyte and a first pressure-sensitive adhesive, and the modified solid electrolyte is obtained by modifying a solid electrolyte with silicon resin; and the second coating comprises sodium carboxymethyl cellulose, a polyvinylidene fluoride-hexafluoropropylene copolymer, an emulsion type binder and a second pressure-sensitive binder. The solid electrolyte has a rigid framework to provide a rapid conduction channel, and the metal organic framework has a high specific surface area and can cooperate with the solid electrolyte to construct a three-dimensional network, so that the stable performance of the coating diaphragm is guaranteed.

The invention discloses an application of a PVDF (Polyvinylidene Fluoride) terpolymer as a negative electrode binder of a semi-solid battery, and the PVDF terpolymer is prepared from a unit derived from vinylidene fluoride accounting for 93.5-98.9% of the molar percentage of the terpolymer, a unit derived from hexafluoropropylene accounting for 1.0-5.0% of the molar percentage of the terpolymer, and a unit derived from hexafluoropropylene accounting for 1.0-5.0% of the molar percentage of the terpolymer. The unit derived from acrylic acid accounts for 0.1%-1.5% of the mole percent of the terpolymer; in the first repeating unit, the molecular weight of the PVDF terpolymer is greater than 1.5 million, in the second repeating unit, the randomly distributed second monomer unit part is 22%-40%, and the molecular weight of vinylidene fluoride VDF, hexafluoropropylene HFP, acrylic acid AA and the PVDF terpolymer is greater than 1.5 million, so that the electrolyte and the PVDF terpolymer form a strong gel-state substance through the synergistic effect, the random flow of the electrolyte among solid particles is limited, and the electrolyte can be used for the lithium ion battery. The long-term uniformity and stability of the electrolyte in the electrode are ensured, the cycle retention rate of the prepared semi-solid battery is high, and the cycle life of the semi-solid battery is prolonged.

The invention discloses an organic-inorganic composite solid electrolyte and a preparation method and application thereof, the organic-inorganic composite solid electrolyte comprises an inorganic ceramic filler, a polymer substrate and a sodium salt; the inorganic ceramic filler is a filler formed by grafting a diamino polyethylene glycol short chain after coating sodium zirconium silicon phosphorus oxide with polydopamine; the polymer substrate is a mixture of polyethylene glycol and polyvinylidene fluoride. The preparation method comprises the following steps: dissolving the polyethylene glycol, the polyvinylidene fluoride, the inorganic ceramic filler and the sodium salt in a solvent to obtain a mixed solution, coating a base material with the mixed solution, and then performing vacuum drying to obtain the organic-inorganic composite solid electrolyte. The organic-inorganic composite solid electrolyte disclosed by the invention has relatively high ionic conductivity, good mechanical property and relatively good interface stability.

The invention belongs to the technical field of high polymer materials, and particularly discloses a polyvinylidene fluoride (PVDF) microporous filter membrane and a preparation method thereof. The PVDF microfiltration membrane comprises the following components: PVDF and has a spherical bouquet-shaped membrane structure; a two-step vapor induced phase separation (VIPS) method is adopted to induce film formation, and the two-step VIPS method comprises low-temperature and low-humidity induction and high-temperature and high-humidity induction treatment. According to the preparation method disclosed by the invention, the membrane forming process is controlled by controlling the formula of the membrane casting solution, adopting a two-step VIPS method to induce membrane forming and controlling key process conditions such as temperature, relative humidity and time in the membrane forming process, so that the PVDF microporous filter membrane with a special spherical bouquet-shaped membrane structure and relatively high flux is prepared; meanwhile, the membrane is simple in preparation process and easy to industrialize.