672 results about "Vinyl fluoride" patented technology

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 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 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 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.

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 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 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 relates to the technical field of chemical and biological separation, and discloses a plasma blood cell semi-automatic settling separation device which comprises a device body, the device body is made of polytetrafluoroethylene, polyvinylidene fluoride or polyphenyl sulfone, the device body is of a fusiform structure, the interior of the device body is hollow, a double-layer magnetic suspension head is arranged in the device body, and the double-layer magnetic suspension head is arranged in the device body. The top end and the bottom end of the device body are respectively provided with an energizable electrode magnetic field for adjusting the position of the double-layer magnetic suspension head, and the device body is composed of an upper-layer main body part and a lower-layer main body part which are detachably connected. According to the semi-automatic settling separation device, blood coagulation activation can be avoided; the double-layer magnetic suspension head is designed to monitor the liquid level in real time and change the height of the floating head in time through an external magnetic field, plasma is rapidly and effectively separated, and manpower and material resource investment is reduced; due to multiple interfaces, the injection and collection efficiency of whole blood, plasma and blood cells is higher; the buffer liquid injection pipeline is inclined, so that mechanical damage to blood cells caused by injection is avoided.

A method for separating VdF and acetylene, the method comprising: a step for mixing a first mixture containing VdF and acetylene with an extraction solvent, which is at least one compound selected from the group consisting of methanol, acetone, chloroform, and 1-chloro-2, 3, 3-trifluoro-1-propene, to obtain a mixture for extraction; and a step in which the mixture for extraction is distilled to obtain a distillate having VdF as the main component and a bottom product having an extraction solvent as the main component and further containing acetylene, respectively.

According to the present invention there is provided a composition comprising: (a) 1, 1-difluoroethylene (R-1132a); (b) difluoromethane (R-32); (c) a trans-1, 2-difluoroethylene (R < 11 > 32 (E)); and (d) one or more of trans-1, 3, 3, 3-tetrafluoropropene (R-1234ze (E)), 1, 1-difluoroethane (R-152a), and 2, 3, 3, 3-tetrafluoropropene (R-1234yf), and a process for producing the same.

The invention discloses a steam eyeshade with effects of soothing nerves and helping sleep and a preparation method of the steam eyeshade. The steam eyeshade comprises an eyeshade body, and ear hooks are connected to the two sides of the eyeshade The eyeshade body comprises an inner layer and an outer layer, and a heat insulation layer, a micro-bead massage layer, a double-U-shaped heating unit and a filtering layer are sequentially arranged from the inner layer to the outer layer. And a far infrared ceramic powder coating is arranged on one side, facing the double-U-shaped heating unit, of the filter layer. The inner layer and the outer layer are non-woven fabrics, the heat insulation layer is a polyethylene-polyvinylidene fluoride microporous composite membrane, and the filter layer is a polyethylene microporous membrane. Wherein the micro-bead massage layer is mainly prepared from aluminum oxide micro-beads with the diameter of 0.8-1.2 mm, compound essential oil, natural plant extract liquor and polyvinyl alcohol. The steam eyeshade prepared by the invention is comfortable to wear, safe and environment-friendly, and can keep constant temperature for more than 30 minutes; the eye mask can massage eye skin, relieve fatigue, fade fine lines around eyes and dark circles, soothe the nerves and help sleep.

A composite separator for a lithium secondary battery according to aspects of this disclosure comprises: a porous organic polymer substrate; a porous inorganic heat-resistant layer coated on at least one surface of the organic polymer substrate, the porous inorganic heat-resistant layer comprising inorganic particles and an organic binder polymer holding the inorganic particles together; and an organic polymer adhesive layer coated on the outer surface of the porous inorganic heat-resistant layer, the organic polymer adhesive layer comprising a vinylidene fluoride-based polymer, wherein the organic polymer adhesive layer further comprises a compound having ethylene oxide repeating units and double bonds at the ends.

The invention discloses a multi-component composite negative electrode material of a sodium-ion battery and a preparation method of the multi-component composite negative electrode material, and relates to the technical field of sodium-ion batteries. The preparation method of the negative electrode material comprises the steps of hard carbon pretreatment, in-situ deposition of Sn-Sb nano-particles, preparation of a hard carbon coated Sn-Sb-carbon nanotube compound and preparation of the negative electrode material. The adopted raw materials comprise hard carbon, SnCl2. 2H2O, SbCl3, a NaBH4 solution, a single-walled carbon nanotube, a polyvinylidene fluoride-hexafluoropropylene copolymer, an emulsifier, a defoaming agent, nano aluminum oxide and a copper foil current collector. The battery negative electrode material prepared by the invention has excellent mechanical properties, and can effectively improve the cycling stability and wide temperature range suitability of the sodium ion battery.

The present invention relates to a technique for preparing a vinylidene fluoride polymer and provides a modified vinylidene fluoride polymer, a preparation method therefor, and use thereof. Using the method of the present invention to prepare a modified vinylidene fluoride polymer can further improve the mechanical properties of the obtained polymer and improve the application performance of the polymer as an electrode binder. The preparation method for the modified vinylidene fluoride polymer comprises reacting components including vinylidene fluoride and an acrylic acid raw material to prepare the modified vinylidene fluoride polymer, wherein the mass content of a dimer in the acrylic acid raw material is 0.1-1000 ppm, the mass content of acetic acid is 0.1-2000 ppm, and the mass content of a polymerization inhibitor is 50-200 ppm.

Mechanically and piezoelectrically anisotropic polymer fibers may be formed by spinning a polymer solution or gel that includes a high molecular weight crystallizable polymer and a liquid solvent. The solvent may be configured to interact with the polymer to facilitate chain alignment and, in some examples, create a higher crystalline content within the spun fibers. The polymer solution may also include a low molecular weight additive. The high and low molecular weight polymers may each be characterized by a bimodal molecular weight distribution where the molecular weight of the additive is less than the molecular weight of the crystallizable polymer. The polymer(s) and the additive(s) may be independently selected from vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, hexafluoropropene, vinyl fluoride, etc. The spun fibers may be oriented, annealed, poled, and woven or laminated to form a polymer thin film having a high elastic modulus and a high electromechanical coupling factor.

The present invention relates to the field of fluororubber synthesis, and disclosed is a preparation method for high-fluorine-content low-compression-set peroxide-cured fluororubber. In the method, vinylidene fluoride, tetrafluoroethylene, and hexafluoropropylene are used as mixed monomers to carry out polymerization reaction, wherein during the polymerization reaction, a cure-site monomer is added. By adjusting the composition ratio of the mixed monomers and uniformly and continuously adding the cure-site monomer, peroxide-cured fluororubber having high fluorine content, resistance to new energy battery media, and low compression set is prepared. The peroxide-cured fluororubber prepared by the method provided in the present invention has a fluorine content stably at 70-71%, a compression set stably less than or equal to 20%, a tensile strength of approximately 22 MPa, and an elongation at break greater than 180%. That is, the problem of relatively high compression set of peroxide-cured fluororubber (particularly high-fluorine-content peroxide-cured fluororubber) in new energy battery applications is effectively solved.

The application belongs to the technical field of composite membrane materials, and particularly relates to a preparation method and application of a super-hydrophilic composite membrane capable of removing various pollutants in water bodies; the preparation method comprises the following steps: preparing a bimetallic organic framework material FeZr-MOF through a one-step solvothermal method; dispersing FeZr-MOF powder in a suitable solvent, mixing, adding polyvinylidene fluoride and polyvinylpyrrolidone, stirring under water bath conditions at 30-80 DEG C, obtaining a uniformly mixed casting solution, and then preparing a FeZr-MOF / PVDF composite membrane through a non-solvent induced phase separation method after ultrasonic defoaming treatment; then, a polyaniline coating layer is in-situ polymerized on the surface of the composite membrane to obtain a PANI / FeZr-MOF / PVDF composite membrane. The super-hydrophilic composite membrane capable of removing various pollutants in water bodies has good effects in oil-water separation, removal of antibiotics and chromium ions in water and the like.

Provided are a composition comprising particles of a tetrafluoroethylene-based polymer and inorganic-oxide particles and having excellent dispersion stability and a method for producing the composition.　The composition production method comprises mixing inorganic-oxide particles with particles of a tetrafluoroethylene-based polymer (1) having a carbonylated group and / or a hydroxylated group to give a mixture and mixing the mixture with particles of a tetrafluoroethylene-based polymer (2), which is different from the tetrafluoroethylene-based polymer (1).

The present application belongs to the field of piezoelectric gel materials, and particularly relates to a polyvinylidene fluoride polymer flexible piezoelectric hydrogel with island structure and a preparation method and application thereof. The flexible piezoelectric hydrogel is a three-dimensional continuous network formed by cross-linking of a hydrophilic polymer as a continuous phase, and polymer microspheres with uniform particle size formed by a hydrophobic polyvinylidene fluoride polymer as a uniformly dispersed dispersed phase. The island structure significantly improves the mechanical properties and piezoelectric properties of the gel. The piezoelectric gel material can be used for human sensing, detecting motion signals and pulse signals, and has high industrial production potential and biomedical application prospect.

The application provides a high-flexibility dielectric positive electrode binder and a preparation method thereof and a solid-state battery positive electrode. The high-flexibility dielectric positive electrode binder comprises a fluoropolymer matrix and a fast ion conductor; the fluoropolymer matrix is a copolymer of vinylidene fluoride (VDF) and a fluorine-containing comonomer, the fast ion conductor is in a one-dimensional nanowire shape and is dispersed in the fluoropolymer matrix; and the mass fraction of the fast ion conductor is 1% to 20% based on the fluoropolymer matrix. The application can simultaneously solve three core problems of physical continuity of an ion conduction path in the positive electrode, inhibition of a space charge layer at an interface and mechanical coating of active particles, thereby significantly improving the rate performance, cycle stability and actual energy density of the solid-state battery.

The invention discloses a metal oxide modified fiber material as well as a preparation method and application thereof. The preparation method comprises the following steps: stirring and dissolving tetraethoxysilane, tungsten chloride, ethanol and hydrochloric acid to form a uniform solution; mixing and dissolving polyvinylpyrrolidone, N, N-dimethylformamide and dimethyl sulfoxide to form another solution; mixing the solutions to prepare a spinning solution, and performing electrostatic spinning to obtain fibers; and dissolving a polyvinylidene fluoride-hexafluoropropylene copolymer and lithium bis (fluorosulfonyl) imide in N-methyl pyrrolidone to form a homogeneous solution, adding the fibers, stirring and mixing, casting to form a film, blade-coating the film to a predetermined thickness, and performing vacuum drying to obtain the target composite electrolyte. The method comprises the following steps: preparing a silicon dioxide nanofiber loaded tungsten oxide nanowire with a high length-diameter ratio through electrostatic spinning, and compounding the silicon dioxide nanofiber loaded tungsten oxide nanowire with a polyvinylidene fluoride-hexafluoropropylene copolymer matrix. The method is simple, convenient, efficient and low in cost, the prepared solid electrolyte is high in stability, the long cycle performance of the battery is remarkably improved, and an important basis is provided for optimizing polyvinylidene fluoride-hexafluoropropylene copolymer based electrolyte and developing a high-performance all-solid-state lithium ion battery.

The invention provides novel azeotrope-like compositions and separation processes utilizing the same. An azeotrope-like composition comprising 1,2-difluoroethylene (HFO-1132) and hydrogen fluoride. An azeotrope-like composition comprising 1,1,2-trifluoroethylene (HFO-1123) and hydrogen fluoride. A separation process for a composition comprising at least one member selected from the group consisting of trans-1,2-difluoroethylene (HFO-1132(E)), cis-1,2-difluoroethylene (HFO-1132(Z)), and 1,1,2-trifluoroethylene (HFO-1123) and hydrogen fluoride.

The application provides a perovskite superlattice, a preparation method and application in a nanoscale light emitting diode, and the preparation method comprises the following steps: S1, adding B raw materials, an organic ligand, a cosolvent and an organic polymer C into a solvent, and then heating in a vacuum environment to obtain a precursor 1; S2, adding A raw materials and a cosolvent into a solvent, and then heating in a vacuum to obtain a precursor 2; S3, heating the precursor 1 to a specified temperature in an inert gas atmosphere, mixing the precursor 2 with the precursor 1, and then reducing to room temperature at a set cooling rate, and then standing, centrifuging and cleaning to obtain a nanoscale perovskite superlattice; the organic polymer C is at least one of polymethyl methacrylate, low-density polyethylene, polyethylene, linear low-density polyethylene, polyvinylidene fluoride or isotactic polypropylene. The nanoscale light emitting diode has small size and high light emitting efficiency.

The invention discloses a polymer proppant suitable for supercritical CO2 fracturing, a preparation method comprises the following steps: S1, modifying an inorganic monomer by using a coupling agent to obtain a modified inorganic monomer; s2, taking an organic monomer A, an organic monomer B and a modified inorganic monomer as raw materials, and preparing polymer microspheres through an emulsion polymerization method; the organic monomer A is one of methyl methacrylate, methyl acrylate or styrene; the organic monomer B is vinylidene fluoride or trifluoroethylene; and S3, putting the polymer microspheres prepared in the step S2 into a plasma reaction cavity, filling CF4 gas to carry out plasma reaction, carrying out fluorination treatment on the surfaces of the polymer microspheres, finally cooling to room temperature, and carrying out vacuum drying to obtain the polymer proppant. The polymer proppant is suitable for supercritical CO2 fracturing, through PVDF copolymerization, inorganic monomer filling and fluorination modification, the swelling resistance of the polymer is effectively enhanced, and the swelling effect induced by supercritical CO2 is resisted.

The invention provides a hydrophilic oleophobic fluorinated ethylene propylene resin preparation device which is characterized in that a stirrer (4) is positioned in the middle of a polymerization reaction kettle (1), a heating device is arranged at the bottom of the polymerization reaction kettle (1), the polymerization reaction kettle (1) is connected with a vacuumizing device (6), and the polymerization reaction kettle (1) is communicated with a dryer (9) through a condensation barrel (7), a demulsification device and a rinsing bath (8); the dryer (9) is connected with a powder vibrating screen (10); and the powder vibrating screen (10) is communicated with a finished product storage tank (11). According to the method disclosed by the invention, a functional monomer introduced with a hydrophilic group is added into a polymerization reaction kettle to react, tetrafluoroethylene and hexafluoropropylene are added to participate in copolymerization, and finally the fluororesin powder coating is prepared by the method and the device. The fluorinated ethylene propylene resin powder coating prepared by the method and the device has hydrophilic and oleophobic characteristics, the preparation process is simple and convenient, and the production cost is low.

There is provided an inorganic solid electrolyte-containing composition containing an inorganic solid electrolyte, a polymer binder, and a dispersion medium, in which the polymer binder includes a polymer binder consisting of a fluorine-based copolymer which contains a vinylidene fluoride constitutional component and a hexafluoropropylene constitutional component of 21% to 65% by mole and in which a tensile fracture strain is 500% or more, and the adsorption rate of this polymer binder with respect to the inorganic solid electrolyte is less than 60%. There are also provided a sheet for an all-solid state secondary battery and an all-solid state secondary battery, in which this inorganic solid electrolyte-containing composition is used, and manufacturing methods for a sheet for an all-solid state secondary battery, and an all-solid state secondary battery.

This invention relates to residual impurities, particularly the total amount of oxidizable carbon (TOC) and the amount of fluoride ions F. - The present invention relates to a method for obtaining a vinylidene fluoride polymer composition with reduced [unclear]. Such improvements can be achieved in a cost-effective manner by combining polymer compounding and washing processes, particularly the use of a dewatering extruder. The present invention also relates to the application of such vinylidene fluoride polymers to high-purity applications.

The embodiment of the invention discloses a wide-range dielectric constant standard substance and a traceable valuing method thereof. The standard substance is based on a four-stage material system of high density polyethylene (HDPE), polyvinylidene fluoride (PVDF), aluminum oxide (Al2O3) and barium titanate (BaTiO3), and wide-range coverage of a single-piece dielectric constant epsilon r of 2.3-118 is realized through volume ratio regulation and control. And an annular retaining ring electrode structure (1-3mm unplated area is reserved on the edge) is adopted, so that the edge capacitance is inhibited to be less than 0.03% of the total capacitance, and the traditional edge correction is avoided. According to the constant value method, a sodium chloride solution (0.760 mol.kg <-1 >) is taken as a first-grade standard, and a quantity value is transmitted through a parallel plate clamp constant, so that the calibration requirement of a frequency band of 100Hz-1MHz is met. The uncertainty is less than or equal to 0.6% (k = 2), and the problems of narrow mass range, complex operation and difficult traceability of the existing standard substance are solved.