114 results about "Vinyl fluoride" patented technology

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 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 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.

Production of HFO-1132 and, in particular, HFO-1132E, may be produced from 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) or CTFE. The present disclosure provides a non-catalytic method for producing trans-1,2-difluoroethylene (HFO-1132(E)), comprising: providing a reactant composition comprising cis-1,2-difluoroethylene (HFO-1132(Z)); and isomerizing the HFO-1132(Z) in an electric heater reactor or a tubular reactor at a temperature of from about 350°C to about 600°C to produce a product composition comprising HFO-1132(E).

A composite separator for a lithium secondary battery according to one aspect of the present invention comprises an inorganic heat-resistant layer and an organic polymer adhesive layer sequentially provided on at least one surface of a porous organic polymer substrate, wherein organic binder polymer particles included in the organic polymer adhesive layer are a mixture of acrylic polymer particles and vinylidene fluoride-based polymer particles, the average particle diameter (D50) of the acrylic polymer particles is 2500nm or more larger than the average particle diameter (D50) of the vinylidene fluoride-based polymer particles, the average particle diameter (D50) of the acrylic polymer particles is 3000nm or more, the average particle diameter (D50) of the vinylidene fluoride-based polymer particles is 100nm to 500nm, and the weight ratio of the acrylic polymer particles to the vinylidene fluoride-based polymer particles is 3.5:6.5 to 4.5:5.5.

The application discloses a high-beta-crystal-phase polyvinylidene fluoride fiber piezoelectric film and a preparation method thereof, wherein the preparation method comprises the following steps: step one: polyvinylidene fluoride resin with a weight average molecular weight of 500,000-800,000, a long branched chain content of 1.2‰-5‰, and a 7% mass fraction NMP solution rotary viscosity of 5000-8000 mpa.s at 25 DEG C is prepared by emulsion polymerization of polyvinylidene fluoride monomer and difluoro-monochloroethane; and step two: the polyvinylidene fluoride resin obtained in step one is made into an electrostatic spinning precursor solution, and the electrostatic spinning precursor solution is spun and film-formed by an electrostatic spinning method. The polyvinylidene fluoride nanofiber film with finer and higher beta-crystal-phase content can be prepared by adjusting the content of the long branched chain and the viscosity of the electrostatic spinning solution.

The application belongs to the technical field of composite micro / nano fiber materials, and particularly relates to a polyimide and polymer composite micro / nano fiber nonwoven fabric, a preparation method and application thereof. The nonwoven fabric is a three-dimensional porous network composed of composite micro / nano fibers with a skin-core structure; the skin layer material of the composite micro / nano fiber is polyimide, and the core layer material is a polymer; the polymer is at least one of polyacrylonitrile, polyvinylidene fluoride and polyarylene ether. The preparation method is to prepare polyimide spinning solution and polymer spinning solution respectively, then perform coaxial electrospinning, and then perform post-processing. The polyimide and polymer composite micro / nano fiber nonwoven fabric has excellent chemical corrosion resistance, excellent mechanical properties, excellent thermal stability, low cost, uniform material compounding, high porosity and high efficient cyclic adsorption performance, can efficiently remove heavy metal ions and organic dyes in water, and has a wide application prospect in the field of water treatment.

The application discloses an array material and a method for detecting VOCs components in gas, and the array material is obtained through the following steps: step 1: each dye is respectively dissolved in an ethanol solution to obtain a dye reagent; the concentration of the ethanol solution is 50%; step 2: polyvinylidene fluoride film is selected as a substrate, the dye reagent obtained in step 1 is separately and individually added on the polyvinylidene fluoride film to form a plurality of dye detection points and form a detection array; then a sealing film is covered above and below the polyvinylidene fluoride film, the polyvinylidene fluoride film is sealed, and an air inlet hole and an air outlet hole are respectively formed above and below the sealing film and correspond to the positions of each dye detection point; nitrogen is slowly blown to the polyvinylidene fluoride film to obtain the array material. According to the method, the array material constructed in the application can clearly distinguish a plurality of volatile organic compounds through visual results or pattern recognition, and the recognition accuracy is high.

This application relates to a copolymer comprising repeating units derived from vinylidene fluoride and repeating units derived from fluorinated monomer M1, having a melting temperature Tm defined by the following relationship: (154.45 - 1.9472*x) - 3 < Tm (°C) < (154.45 - 1.9472*x) + 3 (where x is the weight content of the fluorinated monomer M1 expressed as a percentage based on the total weight of the copolymer, and the melting temperature is measured by DSC according to the ASTM E794-06 standard test method). This application also relates to the use of the composition in various technical fields.

A multilayer Janus membrane with directional wettability includes a polyvinylidene fluoride (PVDF) layer, a polyetherimide (PEI) layer and an intermediate layer of copper oxide nanoparticles and vinylidene fluoride and hexafluoropropylene copolymer (PVDF-HFP) or polyacrylonitrile (PAN). The intermediate layer is in contact between the PVDF layer and the PEI layer, and the PEI fibers interlock between the granular particles of the intermediate layer.

The present application relates to the technical field of high polymer compound composition, and discloses a kind of fluorine-containing rubber's rat bite prevention termite cable sheath material composition, comprising vinylidene fluoride base fluorine-containing rubber matrix and modified mesoporous calcium fluoride powder, by filling repellent component to mesoporous calcium fluoride carrier nanopore, and in orifice enrichment accelerator and on surface grafting functional group preparation, accelerator induces local crosslinking of matrix in carrier orifice when composition vulcanization, form dense crosslinking layer, the present application utilizes dense crosslinking layer to physically lock repellent component at room temperature, and with temperature increase adjustment network gap realizes controlled permeation, solve fluorine-containing rubber matrix small molecule additive blooming problem, maintain long-term biological repellent efficiency, and synergistically enhance the fatigue resistance of sheath material.

The present application relates to a kind of hyperbranched polyvinyl fluoride resin prepared by suspension polymerization with chain transfer agent and its preparation and application, the preparation method of the resin includes: under the condition of using at least one initiator, at least one chain transfer agent, at least one dispersing agent, make polyvinyl fluoride occur polymerization reaction;The chain transfer agent is at least one chain transfer agent of multiple chain transfer sites (≥2) or the combination of liquid phase transfer agent and gas phase transfer agent forms multiple chain transfer sites.Compared with prior art, the polyvinyl fluoride resin of the present application has hyperbranched configuration, and high mechanical strength and good processing performance are considered, the resin is especially suitable for being used as the inner lining material of marine non-adhesive flexible riser, submarine cable packaging layer and other fields, its excellent chemical corrosion resistance, gas permeation resistance and heat aging performance can effectively block the erosion of external corrosive medium to internal tensile armor layer.

A heat-shrinkable tube of the present disclosure is a heat-shrinkable tube comprising a crosslinked product of a fluororesin composition, wherein the fluororesin composition contains a vinylidene fluoride-hexafluoropropylene copolymer as a main component and a crosslinking aid, and when the fluororesin composition is heated from 0°C to a crystal melting temperature at a heating rate of 20°C / min and then cooled from the crystal melting temperature to 0°C at a cooling rate of 20°C / min, the difference between the crystal melting temperature and the temperature at which the elastic modulus of the fluororesin composition reaches 1.0×107 Pa upon cooling from the crystal melting temperature is 82°C or less.

In this method for producing tetrafluoroethylene and octafluorocyclobutane, 1,1,1,2,2-pentafluoroethane is converted into tetrafluoroethylene and octafluorocyclobutane in a gas phase in the presence of silicon oxide. In this conversion, no diluent is used, or 60 vol% or less of a diluent is used relative to the total amount of 1,1,1,2,2-pentafluoroethane and the diluent.

The present invention relates to a method for producing polyvinylidene fluoride with polymerization of vinylidene fluoride, in particularly using a polymerization reactor that comprises a membrane.

This invention relates to a triboelectric nanogenerator and its preparation method, belonging to the technical field of triboelectric nanogenerators. The preparation method includes the following steps: S1, dispersing styrene-ethylene-butene-styrene block copolymer, polyvinylidene fluoride, and MXene nanomaterials in a mixed solvent to obtain a negative friction layer spinning solution; S2, using dynamic pattern-induced multi-material nanofiber electrospinning technology, forming a negative friction layer from the negative friction layer spinning solution; S3, dispersing thermoplastic starch, sodium carboxymethyl cellulose, plasticizer, bis(2-hydroxyethyl) disulfide, and dithiothreitol in water to obtain a positive friction layer film-forming solution; S4, forming a positive friction layer from the positive friction layer film-forming solution; S5, bonding the micro-nano structures of the positive and negative friction layers face-to-face to obtain the triboelectric nanogenerator. This generator combines high output, long lifespan, and flexibility, and can be adapted to diverse scenarios such as wearable electronics, industrial high-temperature sensing, and environmental mechanical energy harvesting.

Provided in the present invention are a leather material, and a preparation method therefor and the use thereof. The leather material comprises a base material and a surface layer present on at least one side of the surface of the base material, wherein the surface layer comprises a cross-linked product of a first polymer. The first polymer comprises a fluorine-containing polymer, and the fluorine-containing polymer comprises one or more of a first fluorine-containing copolymer, polyvinylidene fluoride, polyperfluorinated ethylene propylene and a second fluorine-containing copolymer, wherein the first fluorine-containing copolymer is a copolymer formed by copolymerizing chlorotrifluoroethylene and vinyl ether; and the second fluorine-containing copolymer is a copolymer formed by copolymerizing at least two monomers of tetrafluoroethylene, chlorotrifluoroethylene and vinylidene fluoride. The present invention can improve properties, such as stain resistance, wear resistance and weather resistance, of a leather material.

The present invention relates to a binder composition for a sulfide-based solid electrolyte comprising: a binder including a repeating unit derived from vinylidene fluoride, a repeating unit derived from trifluoroethylene, and a repeating unit derived from chlorotrifluoroethylene; and a non-aqueous solvent.

The application relates to the technical field of water treatment, in particular to an iron-based photocatalytic composite membrane and a preparation method thereof. co AA co VI) copolymer and polyvinylidene fluoride are mixed uniformly in an organic solvent, defoamed, prepared into a porous membrane through a phase inversion method, then coordinated in an acidic aqueous solution of iron ions, and hydrothermally converted to obtain the iron-based photocatalytic composite membrane. The iron-based photocatalytic composite membrane has the beneficial effects that PVDF is used as a film-forming matrix, polymers are used as ligands, nano-iron oxides are generated in situ through hydrothermal reaction, iron ions are uniformly anchored, the introduction of g-C3N4 expands the visible light response, a heterojunction is formed with the iron oxides, the photocatalytic efficiency is improved, halloysite provides adsorption enrichment, cooperates with photocatalysis, the treatment efficiency is improved, the composite membrane has good stability, is convenient to recycle and reuse, and has a long service life.

This invention discloses a method for preparing lithium iron phosphate cathode material and the lithium iron phosphate cathode material itself, belonging to the field of lithium battery technology. The preparation method includes the following steps: adding lithium source, iron source, and phosphorus source to a solvent to obtain a lithium iron phosphate precursor solution; adding epoxidized polyvinylidene fluoride and polyacrylonitrile to the lithium iron phosphate precursor solution, and electrospinning to obtain precursor fibers; adding hydroxylamine hydrochloride to deionized water and adjusting the pH to 7.0 with sodium carbonate to obtain a treatment solution; adding the precursor fibers to the treatment solution and stirring at 65-75℃ for 4-6 hours to obtain a amine-oxime precursor fiber; S4, adding the amine-oxime precursor fiber to a silver nitrate solution, stirring for 1.5-2 hours, removing, drying, heat-treating, and calcining to obtain the lithium iron phosphate cathode material. The lithium iron phosphate cathode material of this invention exhibits significantly enhanced conductivity and excellent capacity and cycle stability.

This invention discloses a composite binder comprising a vinylidene fluoride copolymer and its application. The composite binder includes a first copolymer and a second copolymer. The first copolymer is formed by copolymerizing a vinylidene fluoride monomer and a first monomer shown in Formula I, and the second copolymer is formed by copolymerizing a vinylidene fluoride monomer and a second monomer shown in Formula (II). Specific structures and limitations are detailed in the specification. The weight-average molecular weight of the first copolymer is 800,000 to 3,500,000, and the weight-average molecular weight of the second copolymer is ≤500,000. The mass ratio of the first copolymer to the second copolymer is 100:(0.2 to 10). When applied to the preparation of alkali metal battery electrode slurries, this composite binder not only exhibits excellent resistance to chemical gelation of the slurry and improves slurry stability, but also further enhances the adhesion of the electrode.

This invention discloses a polyvinylidene fluoride (PVDF) resin, its preparation method, and its application. The preparation method includes the following steps: (1) preparing PVDF resin emulsion particles by emulsion polymerization of PVDF monomer; (2) adding a reducing agent and a fluorinated solvent to the obtained PVDF resin emulsion particles; (3) adding PVDF monomer, a dispersant, and an oil-soluble initiator to the emulsion obtained in step (2), and then heating to carry out a suspension polymerization reaction; (4) separating the product after the suspension polymerization is completed to obtain the PVDF resin. The PVDF resin of this invention has high flexibility, high product purity, and high adhesion.

Provided is a production method for chlorotrifluoroethylene and trifluoroethylene, which does not use freon and uses inexpensive raw materials that are by-products of Ishikawa reagent, and which can easily produce the chlorotrifluoroethylene and trifluoroethylene. Provided is a production method for chlorotrifluoroethylene, which includes: (A3) a process A3 of decarboxylating 2,3,3,3-tetrafluoro-2-chloropropionic acid in an anhydrous state in the presence of a base to obtain the above-described chlorotrifluoroethylene; or (B3) a process B3 of chlorinating trifluoroethylene to obtain the above-described chlorotrifluoroethylene.

Disclosed are a dry negative electrode plate for a rechargeable lithium battery and a rechargeable lithium battery including the same. The dry negative electrode plate for a rechargeable lithium battery includes a negative electrode active material and a binder, and the negative electrode active material includes a mixture of a first negative electrode active material, a second negative electrode active material, and a third negative electrode active material, the first negative electrode active material including natural graphite including secondary particles arranged of primary particles, and a coating including amorphous carbon and surrounding the secondary particles, the first negative electrode active material having an orientation degree of 90 or less and a d002 of 3.356 Å to 3.360 Å, the second negative electrode active material including artificial graphite, and the binder including polytetrafluoroethylene, polyvinylidene fluoride, polyolefin, or a mixture thereof.

This invention relates to the field of carbon dioxide capture technology, specifically to a hydrophobic coating, a hydrophobic filler, a method for preparing the same, and the application of the hydrophobic filler. The hydrophobic coating comprises: 1 part by weight of an adhesive, 0.08-0.25 parts by weight of a curing agent, 0.1-0.5 parts by weight of an alkali-modified vinylidene fluoride copolymer, 0.001-0.15 parts by weight of a fluorinated inorganic filler, and 2-8 parts by weight of a coating solvent. The hydrophobic coating provided by this invention, through the combined action of the adhesive, curing agent, alkali-modified vinylidene fluoride copolymer, and fluorinated inorganic filler, not only significantly improves the hydrophobic properties of the coating formed by the hydrophobic coating, but also substantially improves the adsorption properties, wear resistance, corrosion resistance, and thermal stability of the coating formed by the hydrophobic coating.