1160 results about "Vinyl fluoride" patented technology

A fluoroelastomer production method including a step in which monomers A comprising a compound represented by CX1X2=CX3-L-Z, a cyano-group-containing monomer, and at least one compound selected from the group consisting of tetrafluoroethylene, fluorine-containing vinyl ethers, and fluorine-containing allyl ethers are polymerized in an aqueous medium under conditions that substantially no fluorine-atom-containing emulsifier is present.

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 discloses a polyion liquid / polyvinylidene fluoride-hexafluoropropylene-based solid electrolyte with a microscopic liquid phase and a preparation method and application thereof, and the preparation method comprises the following steps: adding a lithium salt into N-methyl-2-pyrrolidone, and stirring until the lithium salt is completely dissolved; then adding imidazolyl polyion liquid to prepare a solution A; adding polyvinylidene fluoride-hexafluoropropylene into N-methyl-2-pyrrolidone to prepare a solution, adding the solution into the solution A, continuously stirring until the solution is fully dissolved to obtain a precursor solution of the solid electrolyte, casting the precursor solution onto a polytetrafluoroethylene mold, and carrying out vacuum drying to obtain the solid electrolyte. And the polyvinylidene fluoride-hexafluoropropylene polymer-based solid electrolyte added with the imidazolyl polyion liquid is prepared by adding the imidazolyl polyion liquid into the polyvinylidene fluoride-hexafluoropropylene polymer-based solid electrolyte. The polymer-based solid electrolyte with a microscopic liquid phase is obtained through an electrolyte preparation process which is mild in condition, simple to operate and easy for large-scale production, and the solid electrolyte has good conductivity and mechanical properties.

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 discloses lithium ion battery slurry and a coating process thereof, and belongs to the technical field of battery diaphragms. The lithium ion battery slurry comprises the following raw materials in parts by weight: 40-50 parts of ceramic powder, 10-15 parts of bio-based semi-aromatic polyamide, 10-15 parts of polyvinylidene fluoride, 35-45 parts of a solvent and 1-4 parts of a dispersing agent. The coating process comprises the following steps: A1, sequentially adding a solvent and a dispersing agent into a stirring tank, then adding ceramic powder, bio-based semi-aromatic polyamide and polyvinylidene fluoride, and uniformly stirring and mixing to obtain bio-based coating slurry; a2, feeding a polyethylene-based membrane into a coating device, coating by using the bio-based coating slurry prepared in the step A1, coating at least one side of a battery diaphragm by adopting a micro-concave roller coating mode, and drying and rolling the coated battery diaphragm to obtain a finished product of the ceramic-coated lithium battery composite diaphragm. The dispersing agent is used in the process of preparing the coating slurry, so that the mechanical property, the heat resistance and the adhesion property of the diaphragm can be improved.

The invention relates to a fluorine-containing binder for a sulfide all-solid-state battery and a preparation method and application thereof.The binder is formed by copolymerizing isoprene and lithium perfluorovinyl ether sulfonate, specifically, the lithium perfluorovinyl ether sulfonate, a chelating agent, an emulsifying agent, ferrous sulfate, a reducing agent and an acid-base buffering agent are dissolved in water, cooling is conducted in the inert atmosphere, and the fluorine-containing binder for the sulfide all-solid-state battery is obtained. And adding isoprene, an initiator and a molecular weight regulator, and carrying out polymerization reaction to obtain the fluorine-containing binder. The isoprene can enhance the solubility of the lithium perfluorovinyl ether sulfonate fragment in the non-polar solvent, so that the whole polymer is dissolved in the non-polar solvent; the perfluorovinyl ether lithium sulfonate has a large space proportion of fluorocarbon groups, and has a shielding effect on hydrocarbon groups on isoprene, so that the stability of the whole polymer can be improved. The fluorine-containing binder prepared by the preparation method disclosed by the invention is a binder with high elasticity, high ionic conductivity and high stability.

The present invention relates to a binder composition for a positive electrode comprising a polymer P1 containing repeating units derived from vinylidene fluoride and a hydrophilic polymer P2 containing repeating units derived from at least one monomer of formula R1R2C = C (R3) C (O) R (I) wherein R1, R2 and R3 are independently selected from H and C1-C5 alkyl; r is selected from-NHC (CH3) 2CH2C (O) CH3,-NR 'R "or-OR', where R 'and R" are independently selected from H and C1-C18 alkyl optionally substituted by one or more hydroxyl, thiol or amino functional groups or five to six membered heterocycles comprising at least one nitrogen atom in the ring, characterized in that the hydrophilic polymer P2 has a weight average molecular weight greater than 30000 g / mol, advantageously greater than 50000 g / mol, preferably greater than 65000 g / mol, more preferably greater than 80000 g / mol.

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 present invention relates to the technical field of modification of lithium battery current collector materials, and provides a coating material and a preparation method for preventing PET film degradation. The coating material is a film-forming substance made of vinyl pyrrolidone / methyl acrylate / fluorinated ethylene copolymer and a graphene nanosheet as a filler. The main component of the film-forming substance is a polyvinyl pyrrolidone segment, and the relative content of the methyl acrylate segment and the fluorinated ethylene segment is small. In addition, the vinyl pyrrolidone / methyl acrylate / fluorinated ethylene copolymer forms a three-dimensional network structure through cross-linking, and the graphene nanosheet forms a chemical connection with the polymer network through a surface active group. The coating can effectively prevent the lithium battery electrolyte and the catalyst alkoxy lithium from contacting with the PET substrate, thereby preventing the PET substrate from degrading.

The invention relates to the technical field of chemical production equipment, and discloses polyvinylidene fluoride powder wet powder purification equipment and a use method.The polyvinylidene fluoride powder wet powder purification equipment comprises a main body, the inner top wall of the main body is fixedly connected with a telescopic linkage assembly capable of stretching out and drawing back, and the outer wall of the telescopic linkage assembly is connected with an overturning assembly capable of overturning in the main body in a meshed mode; a filter pressing assembly capable of sliding up and down in the main body is fixedly connected to the bottom end of the telescopic linkage assembly, a cleaning assembly is fixedly connected to the inner wall of the end, located outside the main body, of the filter pressing assembly through a hose, and an output assembly capable of rotating in the main body is fixedly connected to the inner top wall of the cleaning assembly; the hydraulic telescopic machine drives the overturning gear to rotate through the linkage toothed plate, the polyvinylidene fluoride powder wet powder obtained after filter pressing of the water distribution table and the ultrafiltration plate can be overturned into the discharging bin, a worker does not need to open the device to take out the polyvinylidene fluoride powder wet powder, and the interior of the device is prevented from being polluted.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a preparation method of a polyvinylidene fluoride-hexafluoropropylene-based solid-state lithium battery, and the preparation method comprises the steps of preparing a composite solid electrolyte membrane and assembling the battery. Polyvinylidene fluoride hexafluoropropylene, lithium salt and nitrogen-methyl pyrrolidone are used as raw materials, and the plasticizer and the dendritic mesoporous nano silicon dioxide are added to prepare the composite solid electrolyte membrane, so that more conductive channels are provided for migration of lithium ions, and the electric capacity of the electrolyte is improved; according to the preparation method, the interface compatibility between the PVDF-HFP and the dendritic mesoporous nano silicon dioxide is improved, the electrochemical performance is improved, the crystallinity of the PVDF-HFP is reduced, and short circuit and explosion caused by the fact that dendritic crystals pierce the diaphragm are avoided; the invention solves the potential safety hazards caused by the traditional liquid electrolyte, such as leakage, combustion, explosion and the like, and has the advantages of simple preparation method and low cost, and is suitable for industrial large-scale production.

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 relates to the technical field of nano-generators, in particular to a triboelectric material of nano-porous composite fibers and a preparation method and application of the triboelectric material of the nano-porous composite fibers, and the preparation method comprises the following steps: adding polyvinylidene fluoride and perfluoroethylene propylene copolymer nanoparticles into a mixed solvent of N, N-dimethylacetamide / acetone; uniformly mixing to obtain a polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion; and carrying out electrostatic spinning on the polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion to obtain the triboelectric material. The triboelectric material prepared through the method is a high-charge-density super-hydrophobic nano-generator material based on electrostatic spinning, the electrostatic spinning porous composite fiber material is used as a friction medium layer, high surface charge, hydrophobicity and fouling resistance are achieved, and the performance of a flexible solid-liquid interface nano-generator is improved.

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 invention discloses a phase-change heat-storage fluffy fiber and a preparation method thereof. According to the method, polyethylene glycol, microcapsules, fatty acid, paraffin or alkane and the like are used as phase change heat storage materials, elastic polymers such as polystyrene, polyurethane, polyamide and the like are used as elastic spinning materials, and hydrophobic polymers such as polyacrylonitrile, polysulfone, polytetrafluoroethylene, polyvinylidene fluoride and the like are used as hydrophobic spinning materials; the phase-change heat-storage fluffy fiber is prepared in a high-humidity environment through an electrostatic spinning method. The phase-change heat-storage fluffy fiber synthesized by the method is in a flexible fluffy form and has the advantages of good phase-change stability, low heat conductivity coefficient and the like, and the environmental temperature is kept stable through an accompanying heat absorption or heat release effect when phase change occurs at the phase-change temperature; the material can be used as a thermal insulation filling material and has wide application prospects in human body and environment thermal management and other aspects.

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 a preparation method of a double-layer photo-thermal membrane distillation material, and belongs to the technical field of membrane distillation. According to the double-layer film, a polyvinylidene fluoride super-hydrophobic film serves as a hydrophobic base layer, a carbon nano tube / nano semiconductor material composite nano film serves as a photo-thermal layer, and the photo-thermal layer is attached to the hydrophobic base layer through polyurethane. The preparation method is characterized by comprising the following steps: (1) preparing an electrostatic spinning polyvinylidene fluoride super-hydrophobic membrane; and (2) preparing the electrostatic spinning carbon nano tube / nano semiconductor material composite nano film. Meanwhile, the invention provides a photo-thermal driving membrane distillation device. The double-layer photo-thermal membrane distillation material prepared by adopting the method has good photo-thermal conversion capacity, relatively high water vapor flux and long-term stability, and has a wide application prospect in the aspect of fresh water treatment.

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 invention discloses a polyvinylidene fluoride (PVDF) super-hydrophobic membrane and a preparation method thereof.The preparation method comprises the steps that firstly, methyl sodium silicate, perfluorodecyl triethoxysilane (PFDTES) and tetraethoxysilane (TEOS) serve as catalysts / reactants, fluorinated hydrophobic modification is conducted on hydrophilic silicon dioxide (SiO2) nanoparticles, a nanoparticle non-solvent composite spraying synergistic phase inversion method is provided, and the polyvinylidene fluoride (PVDF) super-hydrophobic membrane is prepared. F-SiO2 is successfully introduced into the surface of the membrane, a multi-scale micro-nano structure is formed on the surface of the membrane, and the hydrophobicity and the surface roughness of the membrane are greatly improved. The prepared membrane is applied to vacuum membrane distillation testing, the flux and the salt rejection rate are very excellent, the maximum salt rejection rate reaches 99.99%, the flux is kept at 18.21 kg.m <-2 >. H <-1 > or above, the performance of the super-hydrophobic membrane is superior to that of a base membrane and a membrane prepared through a traditional non-solvent induced phase separation method, and the super-hydrophobic membrane has good anti-pollution performance and is very good in recovery effect after being washed with water.

The invention relates to the technical field of lithium ion batteries, and provides ultrathin high-adhesion diaphragm coating slurry as well as a preparation method, a coating mode and application thereof. The ultrathin high-adhesion diaphragm coating slurry is prepared from the following components in parts by weight: 10 to 20 parts of nano polyvinylidene fluoride particles, 2 to 3 parts of nano polymethyl methacrylate particles, 0.1 to 0.3 part of flatting agent, 0.1 to 0.3 part of pore forming agent, 0.1 to 0.3 part of lithium salt, 2.5 to 3 parts of thickening dispersant and 100 parts of water. According to the technical scheme, the problems that a lithium ion battery diaphragm coating is thick and the adhesive property of diaphragm coating slurry is poor in the prior art are solved.

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 3D printing multilayer composite all-solid-state electrolyte membrane and a preparation method thereof, and belongs to the technical field of all-solid-state electrolyte. The preparation method comprises the following steps: (1) solution premixing: mixing photosensitive resin, an aprotic polar solution, an inorganic filler, a photoinitiator and a lithium salt to obtain a mixed solution; (2) preparing a slurry A and a slurry B: taking the mixed solution, respectively adding polyvinylidene fluoride and polyoxyethylene, carrying out ultrasonic treatment, and then carrying out oil bath heating to respectively obtain the slurry A and the slurry B; and (3) preparing an electrolyte membrane: sequentially pouring the slurry A and the slurry B into a printing groove of a 3D printer for printing, taking a membrane printed by the slurry A as a middle interlayer membrane, taking a membrane printed by the slurry B as a top layer membrane and a bottom layer membrane, and after printing is completed, washing and drying to obtain the 3D printed multi-layer composite all-solid-state electrolyte membrane. According to the preparation method, penetration of lithium dendrites is effectively inhibited, and the overall stability and durability of the membrane are enhanced.

The invention belongs to the field of flexible sensors, and particularly relates to a flexible sensor prepared from a self-powered piezoelectric nanofiber membrane, and in addition, the prepared sensor also has a human physiological signal acquisition function. The sensor is composed of silicone rubber (Ecoflex 00-30), a polyvinylidene fluoride (PVDF) nanofiber membrane and a copper electrode. As the polyvinylidene fluoride nanofiber membrane prepared by the electrostatic spinning technology is nanoscale, certain surface roughness can be increased when the polyvinylidene fluoride nanofiber membrane is attached to the surface of the silicone rubber, the output performance of the sensor is improved, and meanwhile, due to the hydrophobic property of the polyvinylidene fluoride nanofiber membrane, the sensor can be used for detecting the surface roughness of the silicon rubber. When external energy is collected, the friction loss between a solid friction surface and external liquid is greatly reduced, so that the service life of the sensor is prolonged; finally, by testing the sensor, it is found that the sensor has huge potential in the application field of external energy collection and human physiological signal collection.

The invention belongs to the field of polymer films, and discloses a polyvinylidene fluoride film based on cross-linking reaction and a preparation method and application thereof, and the preparation method comprises the following steps: mixing cyclohexanone, polyvinylidene fluoride and polyoxyethylene diamine to obtain a mixed solution; curing the mixed solution into a film to obtain a blended polyvinylidene fluoride film; and carrying out cross-linking reaction on the blended polyvinylidene fluoride film to obtain a cross-linked polyvinylidene fluoride film, and culturing the cross-linked polyvinylidene fluoride film at 150-165 DEG C to obtain the polyvinylidene fluoride film with high gamma crystal form content. Through detection and comparison, in the polyvinylidene fluoride film based on the cross-linking reaction, the gamma-phase crystal content is obviously increased, and the alpha-phase crystal content is obviously reduced. The method is simple in process and convenient to operate, polyvinylidene fluoride is endowed with the capacity of obtaining gamma crystals at a low temperature in a short time, and the method can be widely applied to the fields of pressure sensors, lithium ion batteries, automobile motors, high-temperature-resistant thermistor devices and the like.

The invention discloses a medium-voltage power cable material which comprises a modified cable base material, and relates to the technical field of preparation of medium-voltage power cable materials. The high polymer material subjected to nanocrystallization treatment is produced by modifying PTFE (polytetrafluoroethylene), and in the modification process, unsaturated chemical bonds in PTFE (polytetrafluoroethylene) molecules are filled by adding a part of fullerene material; therefore, vinyl fluoride and fluoropropylene can be firstly subjected to graft polymerization with functional groups of PTFE (polytetrafluoroethylene), then fullerene is fused into PTFE (polytetrafluoroethylene), and C-F single bonds of vinyl fluoride and fluoropropylene are intervened and replaced by Cn (n is equal to 20, 60, 70, 76, 80 and the like), so that more stable Cn-F functional groups are formed, and the Cn-F functional groups can be formed. The functional group uniformly disperses charges accumulated in electron holes in the cable to the surface of the modified base material based on the excellent conductivity of fullerene, so that the hole injection problem of electrons formed in the cable material is avoided.