1600 results about "Vinyl fluoride" patented technology

A non-glare film 10 is composed of a non-glare layer 18 formed by coating a transparent base film 12 of TAC or the like with a coating material obtained by mixing a light transmissive diffusing material 14 of resin beads and the like in a light transmissive resin 16, and a low refractive index layer 20 composed of a silicon-containing vinylidene fluoride copolymer, said low refractive index layer 20 being laminated onto the surface of the non-glare layer, in which the haze value on the surface of the non-glare layer 18 is 7 to 30 and the haze value inside the non-glare layer 18 is 1 to 15, and when the non-glare film is attached onto the surface of a display panel, it suppresses degradation in contrast and furthermore prevents face-glare, reflecting-in and whitening.

Provided are: a working medium for a heat cycle, said working medium containing 1,2-difluoroethylene and exhibiting high stability, reduced environmental impact, and cycle performance that can replace that of R410A (a pseudo-azeotropic mixed refrigerant including difluoromethane and pentafluoroethane at a mass ratio of 1:1) and 1,1,1,2-tetrafluoroethane; a composition for heat cycle system, said composition using the medium; and a heat cycle system using the composition. The working medium for a heat cycle is characterized by the inclusion of 1,2-difluoroethylene and at least two types of hydrofluorocarbon selected from the group of hydrofluorocarbons that include a carbon-carbon double bond other than a saturated hydrofluorocarbon and 1,2-difluoroethylene.

A silicone-modified fluoropolymer is formed by first dissolving a fluoropolymer in an organic solvent, the fluoropolymer having at least one monomer of vinylidene fluoride coupled to a hexafluoropropylene monomer unit, and subsequently reacting the mixture with an amino silane coupling agent to form an aminosilane-modified fluoropolymer. The aminosilane fluoropolymer is subsequently heated and partially condensed with an oligomer of a silane compound including alkoxy silane. The resultant composition is suitable for use as a low refractive index layer in an antireflection coating on an optical substrate.

A fluoropolymer coated film comprising polymeric substrate film and fluoropolymer coating on the polymeric substrate film. The fluoropolymer coating comprises fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride polymer blended with compatible adhesive polymer comprising functional groups selected from carboxylic acid, sulfonic acid, aziridine, anhydride, amine, isocyanate, melamine, epoxy, hydroxy, anhydride and mixtures thereof. The polymeric substrate film comprises functional groups on its surface that interact with the compatible adhesive polymer to promote bonding of the fluoropolymer coating to the substrate film.

The invention discloses a preparation method for a homogeneously-enhanced polyvinylidene fluoride hollow fiber membrane. The preparation method comprises the following process steps of: firstly, preparing a reinforced body base membrane and taking a polyvinylidene fluoride hollow fiber membrane as the reinforced body base membrane; secondly, preparing a polyvinylidene fluoride membrane casting solution comprising the following components in percentage by mass: 6-20 percent of polyvinylidene fluoride, 0.6-2 percent of hydrophilic polymer or hydrophilic inorganic particle, 6-10 percent of pore-forming agent and 68-87.4 percent of solvent; mixing various components in a water bath of 70-90 DEG C, stirring the components for 3-4 hours and dissolving; and vacuum defoaming to obtain the membrane casting solution; and thirdly, preparing a homogeneously-enhanced membrane; uniformly coating the membrane casting solution to the surface of the reinforced body base membrane through a spinneret for spinning; then spinning the reinforced body base membrane to form a membrane under the traction of a silk guide roller; and solidifying the membrane with ultrafiltration water through an air gap with the length being 5-20cm to obtain the homogeneously-enhanced membrane, wherein the traction speed is 5-25cm / min.

The invention relates to a polyvinylidene fluoride microporous film preparation method by thermally induced phase separation, particular to a polyvinylidene fluoride microporous film preparation method by mixing the high temperature solvent and nonsolvent of the polyvinylidene fluoride in certain proportion to form a compound thinner. The method includes the following steps: polyvinylidene fluoride with the mass percentage of 20-60% and a corresponding compound thinner with the mass percentage of 80-40% are added into a stirring kettle, high-temperature digestion and standing deaeration are carried out in sequence to obtain homogeneous casting solution; the casting solution is directly coated on a supporting net by direct knifing to be planar or is spun by a spinneret to be hollow fibrillar, then the casting solution is dipped into cooling fluid for split phase solidification; and the thinner contained in solidification products is extracted, thus obtaining the polyvinylidene fluoride microporous film. The polyvinylidene fluoride microporous film prepared by the invention is high in film strength and large in water flux with the sections which have a uniform and run-through spongelike structure.

A rechargeable lithium cell comprising a cathode, an anode, an optional ion-permeable membrane disposed between the anode and the cathode, a non-flammable salt-retained liquefied gas electrolyte in contact with the cathode and the anode, wherein the electrolyte contains a lithium salt dissolved in or mixed with a liquefied gas solvent having a lithium salt concentration greater than 1.0 M so that the electrolyte exhibits a vapor pressure less than 1 kPa when measured at 20° C., a vapor pressure less than 60% of the vapor pressure of the liquefied gas solvent alone, a flash point at least 20 degrees Celsius higher than a flash point of the liquefied gas solvent alone, a flash point higher than 150° C., or no flash point, wherein the liquefied gas solvent is selected from methane, fluoromethane, difluoromethane, chloromethane, dichloromethane, ethane, fluoroethane, difluoroethane, tetrafluoroethane, chloroethane, dichloroethane, tetrachloroethane, propane, fluoropropane, chloropropane, ethylene, fluoroethylene, chloroethylene, or a combination thereof.

This invention concerns a process for production of copolymers, especially functionalized, or, at least partially fluorinated copolymers by means of a polymerization process comprising: co-polymerizing, in aqueous emulsion, one or more monomers selected from the group consisting of tetrafluoroethylene, trifluoroethylene, vinylidene fluoride, vinyl fluoride, ethylene, chorotrifluoroethylene, hexafluoropropylene, perfluoromethyl vinyl ether, and perfluoroethyl vinyl ether with a fluorinated co-monomer having limited water solubility, said comonomer being dispersed in the form of droplets of certain sizes.

The invention relates to a composite polymer electrolyte for a lithium ion battery and a preparation method thereof. The electrolyte takes a polymer as a matrix, and an organic-inorganic composite polymer electrolyte formed by modified nano fillers is uniformly dispersed in the matrix; the modified nano fillers comprise nano oxides, ferroelectric powder or lithium-containing compounds, and the mass of the modified nano fillers accounts for 0.5%-30% of that of the polymers; and the polymers comprise polyoxyethylene, polyacrylonitrile, polymethylmethacrylate, polyvinylidene fluoride and polyvinylidene fluoride-hexafluoropropylene copolymer and a blending and copolymerization system thereof. In the invention, methoxylpolyethylene glycol acrylate is adopted to modify the nano fillers, and the surface modification improves the dispersing performance of a polymer system, therefore, the aggregation of nano particles in the polymer system is restrained, the function of the nano particles for promoting the dissociation of lithium salt in the polymer electrolyte is better exerted, a fast ion conduction channel of the fillers / polymer interface is formed and forms dispersive stress of a three-dimensional network with the polymeric matrix. Therefore, the mechanical property of the whole polymer system is improved.

The invention discloses a high-dielectric-constant three-phase composite material containing modified graphene and a preparation method thereof, belonging to the field of dielectric medium materials. For realizing a high dielectric constant for the conventional polymer-based dielectric medium composite material, a large quantity of ceramic particles are required to be added into the composite material, resulting in damages to the mechanical property and electrical property of the composite material. The polymer-based dielectric medium composite material provided by the invention consists of three phases, i.e., polymer substrate polyvinylidene fluoride, filler particle barium titanate and eigen state polyaniline-modified graphene particles respectively. By introducing modified graphene particles into the composite material, the content of ceramic particles is reduced. A polymer is compounded with inorganic particles with a solution method, and the composite material is processed and molded by adopting a hot pressing process, so that an inorganic-polymer three-phase composite material is obtained finally. The composite material provided by the invention has the advantages of high dielectric constant, high adhesive property, simple preparation process and the like.

A process for making a PVDF-based powder coating compositions using a co-coagulation process and compositions comprising co-coagulated PVDF, co-coagulated PVDF-based powder coating compositions and substances coated with these compositions. Vinylidene fluoride polymer latex compositions are mixed with compatible thermoplastic polymer latex, such as acrylic polymer latex, and a coagulant is added. The coagulant precipitates the vinylidene fluoride and polymer, and the precipitant is filtered and dried forming the powder coating. The powder coating is homogenous. The coating comprises no solvents and can be applied to a number of substrates.