161 results about "Polymer dissolution" patented technology

The invention provides a perovskite thin film preparation method, a perovskite thin film and a perovskite solar cell. The method comprises the steps of obtaining a substrate for preparing the perovskite thin film; obtaining a perovskite precursor solution, wherein the perovskite precursor solution comprises a first monomer molecule containing sulfydryl and a second monomer molecule containing a carbon-carbon double bond; coating the perovskite precursor solution on the substrate and carrying out annealing treatment to form a perovskite thin film; and photo-initiating a click reaction between sulfydryl in the first monomer molecule and a carbon-carbon double bond in the second monomer molecule to construct a cross-linked polymer network in situ in the perovskite thin film. A first monomer molecule containing sulfydryl and a second monomer molecule containing a carbon-carbon double bond are introduced into a perovskite precursor solution, so that the problem that the doping amount is limited due to poor solubility of a polymer when the polymer is directly added is avoided.

The invention discloses a high-voltage output elastic self-crimping spiral fiber and a preparation method and application thereof, and belongs to the technical field of fiber preparation. The preparation method comprises the following steps: dissolving a thermoplastic piezoelectric polymer in a first solvent dissolved with metal salt to prepare a first spinning solution; a high-elasticity polymer is dissolved in a second solvent to prepare a second spinning solution, the second solvent is different from the first solvent, and the high-elasticity polymer is incompatible with the thermoplastic piezoelectric polymer; taking the first spinning solution as a shell layer solution and the second spinning solution as a core layer solution, and carrying out electrostatic spinning by adopting a two-component core-shell electrostatic spinning process. The preparation method is simple, and the prepared fiber has excellent mechanical property and enhanced piezoelectric effect and can be applied to flexible electronic devices and intelligent wearable equipment.

The invention provides an electrochromic film, an electrochromic device and a preparation method of the electrochromic film, and relates to the technical field of electrochromic materials.The preparation method of the electrochromic film comprises the steps that a conjugated polymer is dissolved in a good solvent, and an electrochromic medium is obtained; preparing the electrochromic medium into an electrochromic film by adopting a spin coating method or a blade coating method; the electrochromic film is placed in a dopant solution to be doped, and the final electrochromic film is obtained. The invention provides a novel color changing mode of the polythiophene-based electrochromic film, and can improve the problem of poor bistable performance of the existing polythiophene-based electrochromic film.

The invention discloses offshore oilfield chemical flooding fully-closed instant curing injection allocation process equipment and a using method. The offshore oilfield chemical flooding fully-closed instant curing injection allocation process equipment comprises an efficient dispersion system, an instant curing system and a high-pressure injection system which are sequentially connected. The efficient dispersing system comprises a feeding mechanism and a dispersing mechanism which are connected with each other; the instant curing system comprises a high-viscosity efficient ager, a supergravity ager, a low-shear feeding pump, a tubular rotational flow ager and a mother liquor duplex filter which are communicated in sequence; the high-pressure injection system comprises a high-pressure polymer injection pump, a high-pressure tubular rotational flow ager, a first high-pressure internal part coupling disperser and a second high-pressure internal part coupling disperser which are connected in sequence. By taking the stator and rotor disperser, the internal part coupling dynamic disperser, the high-viscosity and high-efficiency ager and the supergravity ager as a core, the device has the characteristics of low carbon, high efficiency, miniaturization, modularization, distribution and the like, the polymer dissolving and curing time is shortened, the equipment weight and the occupied area are reduced, and the polymer solution viscosity and the oil displacement efficiency are improved.

The application belongs to the technical field of porous adsorption membrane materials, and discloses a titanium lithium ion porous adsorption membrane material and a self-assembly preparation method and application thereof. The preparation method comprises the following steps: dissolving a film-forming polymer in a dispersion liquid containing MXene nanosheets to form a uniform precursor liquid; the MXene nanosheet is a carbide, nitride or carbonitride of a transition metal with a single-layer structure; dispersing a titanium lithium composite oxide in the precursor liquid to form a casting solution; coating the casting solution on a support, and then performing phase inversion by using pure water to obtain a matrix film; placing the matrix film in a lithium elution liquid for immersion washing, replacing lithium ions in the matrix film, and causing a self-assembly reaction of the titanium lithium composite oxide in the matrix film, so that the titanium lithium ion porous adsorption membrane material is obtained. The application innovatively introduces MXene nanosheets and a polysulfone matrix film, fixes the MXene nanosheets on the polysulfone matrix film as an in-situ growth substrate of the titanium lithium composite oxide, and the obtained membrane material has a high adsorption capacity.

The invention provides a preparation method of a hydrogel film, the hydrogel film and application, the preparation method comprises the following steps: S1, dissolving a polymer in a solvent I, and adding an aldehyde compound to obtain a polymer solution; s2, inorganic salt is dissolved in a solvent II, sulfuric acid is added, and a coagulating bath solution is obtained; s3, extruding and spreading the polymer solution on the surface of the coagulating bath solution to form a film, so as to obtain the hydrogel film. According to the prepared hydrogel film, spreading film forming and curing processes are combined, the preparation time of the hydrogel film is greatly shortened, and the problem that the hydrogel film is difficult to cure and form is solved.

The invention discloses a polymer electrolyte, a preparation method thereof and a battery, and the preparation method of the polymer electrolyte comprises the following steps: dissolving a polymer containing a nucleophilic functional group in a polar solvent to obtain a first polymer solution; dissolving a natural high-molecular polymer in a polar solvent to obtain a second polymer solution; mixing the first polymer solution and the second polymer solution to form a double-polymer solution; adding a cross-linking agent into the double-polymer solution, casting, standing and curing to obtain a polymer film; immersing the polymer membrane in a polar solvent for removing the residual cross-linking agent and the non-cross-linked polymer and carrying out soaking swelling absorption, and then freeze-drying at a temperature of-55 DEG C to-35 DEG C, so that pores are formed in the polymer membrane to form a porous polymer membrane; and soaking the porous polymer membrane to absorb electrolyte containing lithium salt, and standing to obtain the dual-network polymer electrolyte. The ionic conductivity of the polymer electrolyte is effectively improved.

The invention discloses a mixed matrix membrane based on defect MOF and a preparation method and application thereof, and the method comprises the following steps: (1) dissolving a hydroxyl-containing monodentate carboxyl organic ligand and 2-aminoterephthalic acid in a solvent A, stirring at room temperature, and carrying out ultrasonic treatment to obtain a mixed solution; then dropwise adding tetraisopropyl titanate into the mixed solution, and carrying out heating reaction in a reaction kettle; after the reaction is finished and cooling is carried out, a solid product is collected through centrifugation, washed and dried, and DN-MIL-125 is obtained; (2) dispersing DN-MIL-125 in a solvent B to obtain a DN-MIL-125 suspension, dissolving an intrinsic microporous polymer cPIM-1 in a solvent C to obtain a cPIM-1 solution, and then uniformly mixing the cPIM-1 solution with the DN-MIL-125 suspension to obtain a membrane casting solution; and carrying out defoaming treatment on the membrane casting solution, and forming a membrane by adopting a solution casting method to obtain the mixed matrix membrane DN-MIL-125 / cPIM-1. According to the method, the defective metal organic framework material DN-MIL-125 is added into the cPIM-1 intrinsic microporous polymer to prepare the mixed matrix membrane, and the separation performance of CO2 / N2 gas can be remarkably improved.

The invention discloses a preparation method of polymer drug-loaded nanoparticles. According to the method, on the basis of an emulsification method, the controllable continuous preparation of the polymer drug-loaded nanoparticles is realized by utilizing an ultrasonic micro-fluidic technology. The method specifically comprises the following steps: dissolving a drug and a polymer in a water-insoluble organic solvent to serve as an organic phase, taking a surfactant aqueous solution as a water phase, introducing the two phases into ultrasonic microfluidic equipment at a certain flow velocity ratio, and emulsifying under the ultrasonic action to obtain uniform liquid drops; and removing the organic solvent by methods of stirring, rotary evaporation, vacuum centrifugation, ultrafiltration and the like to obtain the cured polymer drug-loaded nanoparticles. The nanoparticles prepared by the method are uniform in particle size and high in drug encapsulation efficiency, and can be continuously produced.

The invention relates to the technical field of oil and gas field development engineering and intelligent control, in particular to a polymer dry powder direct distribution fracturing fluid remote data transmission control system which comprises an environmental parameter acquisition center used for acquiring the conductivity, the fluid temperature, the fluid pH value, the mineralization degree and the dry powder polymer nominal molecular weight of a fracturing operation site. The data is sent to the dynamic reference construction unit; the dynamic reference construction unit is used for obtaining theoretical equilibrium viscosity and a characteristic swelling time constant, and constructing a theoretical reference evolution equation by utilizing the theoretical equilibrium viscosity and the characteristic swelling time constant; the space-time mapping sensing unit collects main path mixed flow to obtain an actually measured dissolution rate signal; the active factor identification unit is used for calculating a polymer dissolution active factor; the cascade feedback control unit generates predicted final value viscosity and a screw feeder frequency conversion control signal, and constructs a semantic feature transmission vector; accurate feedforward control over the performance of the fracturing fluid is achieved, and the hysteresis problem of traditional control is solved.

The invention relates to the technical field of wave-absorbing materials, in particular to a high-entropy nano-alloy fiber wave-absorbing material, a preparation method thereof and wave-absorbing non-woven fabric, and the preparation method comprises the following steps: dissolving a polymer in a mixed solvent of DMF and acetone to form a solution, then adding metal salt, and stirring at 60-80 DEG C to obtain a spinning solution; performing electrostatic spinning on the spinning solution to obtain a high-entropy alloy nanofiber precursor; and pre-oxidizing the high-entropy alloy nano-fiber precursor at 220-240 DEG C under an air condition, and calcining at 800-900 DEG C to obtain the high-entropy nano-alloy fiber wave-absorbing material. The high-entropy nano-alloy fiber with uniform morphology and uniform multi-metal nanoparticle distribution is prepared by adopting a mode of combining electrostatic spinning and high-temperature calcination; according to the high-entropy nano-alloy fiber, through the synergistic enhancement performance of all the elements, the material is endowed with excellent corrosion resistance while the excellent microwave absorption performance is guaranteed.

A method for purifying a regenerated polymer into a higher-purity polymer is disclosed. In embodiments of the present invention, the method comprises obtaining a regenerated polymer, leaching various contaminants using a leaching solvent to produce an leached polymer, and then dissolving the leached polymer in a solvent to produce a first solution containing the dissolved polymer. The first solution is precipitated, filtered, and extracted. A higher-purity polymer is separated from the obtained solution.

The present invention provides organic particles with high solvent resistance, which are made from a polymer having a main skeleton of cis-1,4-polyisoprene, a typical example of which is natural rubber. [Solution] A method for producing organic particles includes the steps of dissolving a polymer having cis-1,4-polyisoprene as a main skeleton in a solvent and carrying out a cyclization reaction to obtain a cyclized rubber having a cyclization rate of 60 to 90%, and suspension polymerizing the cyclized rubber and a vinyl monomer in the presence of water and a suspension stabilizer, wherein the polymer having cis-1,4-polyisoprene as a main skeleton has a Mooney viscosity [ML(1+4)100°C] specified in JIS K 6300 of 18 to 65, and the vinyl monomer contains a monofunctional vinyl monomer having only one vinyl group and a crosslinkable vinyl monomer having multiple vinyl groups.

The invention discloses anti-adhesion hemostatic hydrogel as well as a preparation method and application thereof. The preparation method of the anti-adhesion hemostatic hydrogel comprises the following steps: dissolving an amino high-molecular polymer in a first solvent to obtain a component A; dissolving a cross-linking agent, a reaction active compound and an anti-tissue adhesion drug in a second solvent to obtain a component B; wherein the cross-linking agent is a dialdehyde compound, and the reaction active compound contains an NHS group; before use, the component A and the component B are mixed, and then in-situ crosslinking can be performed to obtain the anti-adhesion hemostatic hydrogel. The anti-adhesion hemostatic hydrogel disclosed by the invention can form a layer of physical barrier at a wound of an organ, so that the effects of stopping bleeding and preventing tissue adhesion are achieved; in addition, the anti-adhesion drugs uniformly dispersed in the gel network enhance the anti-tissue adhesion effect of the adhesive through the effects of inhibiting tissue surface fibroblast proliferation, promoting fibrin degradation, resisting inflammation and oxidation and the like; the hemostatic hydrogel disclosed by the invention has the advantages of biodegradability and good biocompatibility.

The present invention relates to the technical field of luminescent materials, and discloses an organic room-temperature phosphorescent material with controllable afterglow performance, a preparation method thereof, and an application thereof. The method includes the following steps: Step 1, dissolving a terpyridine derivative and a polymer in water to obtain a precursor solution; removing water by volatilization to obtain an organic room-temperature phosphorescent material; Step 2, soaking the organic room-temperature phosphorescent material in an aqueous solution containing lanthanide ions, and removing water by volatilization to obtain the organic room-temperature phosphorescent material with controllable afterglow performance; by regulating the concentration of lanthanide ions in the aqueous solution containing lanthanide ions, the afterglow performance of the organic room-temperature phosphorescent material is regulated, and the prepared material still has the advantage of transparency. On the other hand, the organic room-temperature phosphorescent material with controllable afterglow performance exhibits long-wavelength fluorescence emission and short-wavelength afterglow emission, greatly expanding the scope of practical applications.

The invention relates to the technical field of polymer dissolution, in particular to a polymer dissolution packed bed, a polymer dissolution system and a polymer dissolution method. The packing ring can rotate while revolving, and the contact opportunity and the contact time of the packing ring and a solution can be increased and prolonged by utilizing the rotation of the packing ring, so that the efficiency of a chemical reaction or physical separation process is improved, and a polymer is quickly dissolved. Meanwhile, the design of rotation and revolution of the packing ring is beneficial to more uniformly mixing treated substances, reducing mass transfer or heat transfer resistance and improving the uniformity of the whole process. The revolution mechanism and the rotation mechanism jointly form a multi-shaft type rotation transmission mechanism, revolution is achieved through driving of a single revolution motor, and meanwhile rotation of each packing ring is achieved through the revolution process of each first gear and the meshing relation between each first gear and a static second gear. According to the multi-shaft type rotation transmission mechanism, the kinetic energy of the motor can be more effectively utilized, and the energy consumption of equipment is reduced.

The invention discloses a preparation method and application of an in-situ copolymerized PIM-pillararene composite membrane, a tetrahydroxy-containing compound and a tetrafluoro-containing compound are used as reaction monomers, a precursor matrix is synthesized by adjusting the proportion of the tetrafluoro-containing compound, and then a mixed matrix polymer is obtained by in-situ doping of polyhydroxy pillararene. Dissolving a polymer in an organic solvent to obtain a membrane casting solution; and coating a solvent-resistant substrate with the membrane casting solution, and drying in a drying oven to obtain the composite membrane with high separation performance. Fluorine groups in a PIM matrix and hydroxyl groups on cyclic polyhydroxy aromatic hydrocarbon molecules are subjected to chemical cross-linking reaction to enhance the porosity of the polymer and increase the specific surface area, and column aromatic rings are introduced to promote adsorption of guest molecules, so that rich high-performance transmission channels are formed. On the basis of PIM synthesis, a polyhydroxy pillar arene compound is further introduced, the membrane stability can be improved through a rich net structure, and the separation performance of common organic solvents is remarkably improved.

The application discloses a flexible carbon nanometer net film material and a preparation method thereof, and belongs to the technical field of nanometer fiber electrode materials. The preparation of the flexible carbon nanometer net film material comprises the following steps: dissolving a polymer in a solvent A to obtain a solution B; ultrasonically dispersing the solution B in a solvent C to obtain a spraying net emulsion; wherein the solution B and the solvent C are immiscible; performing electrostatic spraying on the spraying net emulsion to obtain a polymer nanometer net film; performing pre-oxidation on the polymer nanometer net film; applying longitudinal and transverse tension to the polymer nanometer net film under a protective atmosphere; calcining the polymer nanometer net film; and cooling the polymer nanometer net film to obtain the flexible carbon nanometer net film material. The flexible carbon nanometer net film material has an efficient conductive network, exhibits excellent conductive performance and flexibility, and has a wide application in the fields of wearable devices, flexible sensors, energy storage devices and biomedical devices.

The present invention provides a modifier for silicon-based anode materials, a modified silicon-based anode material and its application. The modifier for silicon-based anode materials comprises a combination of a first polymer and a second polymer. The first polymer is a water-soluble polymer, and the second polymer is a water-insoluble polymer. The first polymer and the second polymer are dissolved in the same non-aqueous solvent. The modifier for silicon-based anode materials can uniformly coat the surface of the silicon-based material to obtain a modified silicon-based anode material with a polymer coating layer. In the preparation of the anode slurry, the first polymer dissolves to form a porous network-like coating structure on the surface of the silicon-based material, effectively alleviating the volume expansion of the silicon-based material during charge and discharge, preventing the pulverization and shedding of the material, and having excellent structural stability and cycling performance. At the same time, there are still a large number of conductive channels on the surface of the silicon-based material, which will not cause an increase in the impedance of the material, and has excellent rate performance.

A method for inhibiting the formation of scale in a subterranean geological includes injecting a scale-inhibiting composition into a subterranean geological formation comprising a target zone. The scale inhibiting composition includes water and an amphiphilic polymer selected from the group consisting of S1, S2, and combinations thereof, where the structure of S1 is:the structure of S2 is:where x is in a range from 4 to 20, and n is in a range from 3 to 15, and where the amphiphilic polymer is dissolved in the scale inhibiting composition in an amount such that the concentration of the amphiphilic polymer at the target zone is equal to or greater than 500 ppm.

The invention belongs to the field of composite membranes, and particularly relates to a waterproof breathable membrane based on a micropore-nanofiber composite structure and a preparation method of the waterproof breathable membrane. Comprising the following steps: preparing an ePTFE microporous membrane by adopting a thermally induced phase separation method or a two-way stretching method, and carrying out corona treatment on the ePTFE microporous membrane; dissolving a fiber-forming polymer in an organic solvent to form a uniform spinning solution; the ePTFE microporous membrane obtained after corona treatment is fixed to a receiving roller; carrying out electrostatic spinning by adopting a multi-jet nozzle to obtain a nanofiber / base membrane composite blank; meanwhile, an N, N-dimethylformamide steam treatment cabin is arranged behind the receiving roller, then continuous interface fusion and reinforcement treatment is immediately carried out on the just deposited nanofiber / base membrane composite blank through a hot pressing roller, and the composite membrane is obtained; and drying and rolling the composite film to obtain the waterproof breathable film with the micropore-nanofiber composite structure. The breathable film provided by the invention realizes extremely high hydrostatic pressure and excellent water vapor permeability, and also has good mechanical strength and durability.

The invention discloses a nano-channel based on Pd-Co cyanogen gel nano-enzyme, a preparation method and application of the nano-channel in glucose detection, and belongs to the technical field of biosensors. The nano-channel based on Pd-Co cyanogen glue nano-enzyme is a TiO2 nano-channel (TiNM) with two open ends, the two open ends are a large opening end and a small opening end respectively, metal organic frameworks (MOFs) are grown in situ in the TiNM through a biomimetic mineralization method to immobilize Pd-Co cyanogen glue nano-enzyme molecules, and a metal organic framework composite nano-enzyme structure is formed. Meanwhile, the end face of the small opening end is coated with a pH response polymer to form a gating structure. Glucose generates gluconic acid and hydrogen peroxide under catalysis of Pd-Co cyanogen gel nano-enzyme, the pH change in the channel is triggered, and the pH response polymer is dissolved, so that the gating structure is activated to be opened. The sensor is used for glucose detection, has relatively high selectivity and relatively strong anti-interference capability on glucose, and has good repeatability and operation stability.

The invention belongs to the technical field of oil and gas field development and research, and relates to a method and system for predicting the solubility of a non-Newtonian polymer in a forced stretching device and a readable medium, and the method comprises the following steps: obtaining the viscosity of a target polymer after natural dissolution, and fitting an intrinsic equation according to the viscosity; based on the intrinsic equation and the swelling behavior of the polymer particles, establishing a swelling double-fluid model, and inputting the mass transfer rate of the non-Newtonian polymer into the swelling double-fluid model to generate a liquid phase volume fraction and a solid phase volume fraction; inputting the volume fractions of the liquid phase and the solid phase into a component transport equation to generate the mass fractions of all components in the solid phase so as to obtain the solid density; inputting the liquid-phase and solid-phase volume fractions into the group equilibrium model to generate the average particle size of solid-phase particles; coupling output results in the swelling double-fluid model, the component transport equation and the group balance model to obtain the dissolving property of the non-Newtonian polymer. The method can more accurately predict the behavior characteristics of particles in non-Newtonian complex fluid so as to realize the process optimization of polymer rapid dissolution configuration.

The invention discloses a low-friction, high-sand-carrying, heat-resistant, shear-resistant, and high-viscosity linear adhesive and a preparation method thereof, and belongs to the field of deep / ultra-deep well volume fracturing. The linear adhesive is polymerized by acrylamide, sodium acrylate, a sulfonate ion-containing hydrophobic monomer, a hydrophobic unit microblock regulator, a molecular weight grading agent, and a composite initiator. Through the control of special sulfonate ion-containing hydrophobic monomers, hydrophobic unit microblock regulators, and molecular weight, the polymer solubility and viscosity-increasing properties can be significantly improved; the shear resistance of the linear adhesive is improved; the linear adhesive has excellent sand-carrying and drag-reducing properties; the shortcomings of the existing linear adhesive, such as weak shear resistance, fast drag reduction rate drop, and poor sand-carrying properties, can be overcome, and the special requirements of deep / ultra-deep oil and gas reservoir fracturing on fracturing fluid rheology and "high wellbore drag reduction" can be met, so as to provide key material support for the development of deep / ultra-deep oil and gas resources and ensure the goal of efficient development of deep / ultra-deep oil and gas resources.

The invention relates to a gas separation polymer composite membrane with high pressure resistance as well as a preparation method and application thereof. The method comprises the following steps: dissolving a crystalline polymer in a good solvent, uniformly coating the polymer solution on the surface of a flat substrate, immersing the flat substrate in an ionic liquid with weak interaction with the polymer, and carrying out solvent exchange treatment at a constant temperature. The polymer / ionic liquid composite membrane prepared by the method is used for gas separation. According to the gas separation polymer composite membrane, the high ionic liquid content is maintained, and meanwhile the high mechanical performance of the composite membrane is maintained. The ionic liquid can stably exist in a polymer matrix to improve the continuity of a gas transmission path, and meanwhile, the ionic liquid which weakly interacts with a macromolecular chain can effectively promote a polymer molecular chain to form a microcrystalline structure in the exchange process, so that the mechanical property of the composite membrane in the gas separation process is greatly improved, and the gas separation efficiency is improved. And during gas separation, high pressure resistance, high permeability and high selectivity are shown. The method is simple in process, convenient to operate and mild in condition.

The present application relates to the technical field of fiber surface treatment, in particular to a sizing agent based on a multiple bonding synergistic enhancement mechanism and a preparation method and application thereof, comprising the following steps: dissolving a polymer containing active hydrogen functional groups in a solvent A under a protective atmosphere, stirring and dissolving to obtain a polymer solution; dropping a compound containing covalent crosslinking active sites into the polymer solution, continuously reacting to obtain a homogeneous modified solution; purifying the homogeneous modified solution to obtain a purified product; dissolving the purified product in a solvent B to obtain the sizing agent. The present application solves the technical problems of low physical adsorption bonding strength and poor fatigue resistance caused by the rigidity of a single chemical bonding interface in the existing aramid fiber surface modification technology.

The present application relates to the technical field of zinc metal battery, in particular to a multifunctional composite gel electrolyte, its preparation method and application. The present application provides a composite gel electrolyte, which comprises a polymer gel matrix, a zinc salt and a ZnHA filler; wherein the ZnHA filler is a hydroxyapatite material doped with zinc ions. The electrolyte is prepared by polymer dissolution, zinc salt addition, ZnHA dispersion, three-dimensional printing forming, low-temperature gelation and zinc salt solution activation, and has good shear thinning characteristics, self-supporting property and printability. Further, a three-dimensional printed interdigital structure electrode is constructed, and the electrolyte is covered to form an ion transmission channel, and a flexible zinc metal battery is assembled; multiple monomers can be connected in series to increase the output voltage. The flexible battery has excellent ion transmission, cycle stability, flexibility and safety, and can be used in the fields of flexible electronics, wearable devices and intelligent sensing.

To provide a vinyl chloride-based polymer that has, when dissolved in a solvent, excellent filterability.SOLUTION: A method for producing a vinyl chloride-based polymer comprises a polymerization step of suspension-polymerizing a monomer mixture comprising vinyl chloride monomer and a monomer copolymerizable with vinyl chloride monomer in the presence of an aldehyde, wherein the added amount of the aldehyde is 0.1 wt.% to 4.0 wt.% relative to the weight of the monomer mixture, the whole charged amount of the monomer copolymerizable with vinyl chloride monomer relative to the whole charged amount of vinyl chloride monomer and the monomer copolymerizable with vinyl chloride monomer is 16.0 wt.% to 22.0 wt.%, and the amount of initial charge of vinyl chloride monomer relative to the whole charged amount of vinyl chloride monomer is 28.0 wt.% to 38.0 wt.%.SELECTED DRAWING: None

The present application provides a positive electrode plate and a preparation method thereof, an energy storage device and an electrical equipment. The positive electrode plate provided in the present application includes: a current collector and an active material layer, the active material layer is arranged on the surface of the current collector, the active material layer includes active material particles and a polymer, the polymer is wrapped on the surface of the active material particles, and the polymer is hydrophobic; when the positive electrode plate is applied to an energy storage device, the polymer dissolves in the electrolyte of the energy storage device. The positive electrode plate has low requirements for environmental humidity during production, which reduces the manufacturing cost of the energy storage device. When the positive electrode plate is applied to an energy storage device, it does not affect the shuttling of active ions between the positive electrode plates, nor does it reduce the content of active elements in the active material particles, and does not affect the electrochemical performance of the energy storage device.

The present application relates to the technical field of radiative cooling, and discloses a preparation method for an ultra-high reflectivity radiative cooling fiber membrane. In the present application, a polymer is dissolved in an organic solvent to prepare an electrospinning precursor solution, and by adjusting parameters such as the concentration of the electrospinning precursor solution, a spinning voltage, a spinning distance, a drum rotation speed, a spinning liquid supply rate, and a slide rail reciprocation rate, an ultra-high reflectivity radiative cooling fiber membrane having a porous structure is prepared. The reflectivity of the ultra-high reflectivity radiative cooling fiber membrane is greater than 95% in a solar spectral band of 0.3-2.5 um. The ultra-high reflectivity radiative cooling fiber membrane prepared in the present application has a thickness of 300-500 um. The ultra-high reflectivity radiative cooling fiber membrane of the present application can be prepared in batches, has good flexibility, and can be widely applied to the fields of garments, buildings, equipment, etc.