1545 results about "Vinyl fluoride" patented technology

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 present invention provides a tetrafluoroethylene polymer aqueous dispersion obtained by carrying out a TFE polymerization in an aqueous medium in the presence of a fluorovinyl group-containing emulsifier, wherein the TFE polymer aqueous dispersion contains a particle comprising a TFE polymer dispersed in the aqueous medium, the fluorovinyl group-containing emulsifier comprises a fluorovinyl group-containing compound, and the TFE polymer aqueous dispersion has a fluorine-containing surfactant content of not higher than 1000 ppm by mass.

In accordance with at least selected embodiments, new or improved ceramic coated separators, membranes, films, or the like for use in lithium batteries, new or improved batteries including such ceramic coated separators, membranes, films, or the like, and methods of making or using such ceramic coated separators, membranes, films or the like are disclosed. In accordance with at least certain embodiments, new or improved aqueous or water-based polymeric coated separators, membranes, films, or the like are disclosed. In accordance with at least particular embodiments, new or improved aqueous or water-based polyvinylidene fluoride (PVDF) or polyvinylidene difluoride (PVDF) homopolymer or co-polymers of PVDF with hexafluoropropylene (HFP or [—CF(CF₃)—CF₂—]), chlorotrifluoroethylene (CTFE), vinylidene fluoride (VF₂.HFP), tetrafluoroethylene (TFE), and/or the like, blends and/or mixtures thereof, coated separators, membranes, films or the like, new or improved porous separators for use in lithium batteries, new or improved coating or application methods for applying a coating or ceramic coating to a separator for use in a lithium battery, new or improved PVDF or PVDF:HFP films or membranes, and/or the like are disclosed.

A method of making a curable fluoroelastomer is disclosed. The method comprises the steps ofpreemulsifying at least one perfluorovinylether in water, andcopolymerizing the preemulsified perfluorovinylether with a gaseous fluorinated monomer in the presence of a cure site monomer. The method provides a fluoroelastomer having a glass transition temperature of less than -10° C. Also disclosed is a fluoroelastomer that consists essentially of a perfluorovinylether of formula (I) as defined below, a cure site component, perfluoromethylvinylether, and tetrafluoroethylene and/or chlorotrifluoroethylene.

The invention relates to a method for the preparation of a polymer electrolyte electrochemical cell using an electrolyte precursor, said precursor comprising one or more solvents, one or more salts and a polymer which dissolves in the solvent at a first temperature (T_dissol) and which is capable of forming a gel on subsequent cooling following heating to a second temperature (T_gel). T_dissol being lower than T_gel, which method comprises: (a) heating the electrolyte precursor to T_dissol; (b) optionally cooling the electrolyte precursor, (c) incorporating the electrolyte precursor into the electrochemical cell; (d) heating the electrochemical cell to T_gel; (e) cooling the polymer electrochemical cell to ambient temperature to bring about gelling of the polymer electrolyte. Preferably the polymer is a homopolymer or copolymer from the group of monomers of vinyl fluoride, vinylidenefluoride, trifluoroethylene, tetrafluoroethylene and hexafluoropropylene.

The invention discloses a polyvinylidene fluoride hollow fiber film and a preparation method thereof. The polyvinylidene fluoride hollow fiber film comprises the following components by weight percent: 20-60% of polyvinylidene fluoride resin, 10-50% of organic pore-forming agent, 1-30% of inorganic pore-forming agent and 5-30% of solvent. The preparation method comprises the following steps: mixing, squeezing, cooling, stretching, extracting the organic pore-forming agent and the inorganic pore-forming agent, and thermally shaping. The obtained polyvinylidene fluoride hollow fiber film has the advantages of high strength, good performance, better hydrophilicity, simple preparation process and energy saving.

The invention belongs to the technical field of composites, and discloses a polyvinylidene fluoride and metal-organic framework composite ultra-filtration membrane and preparation and application. The preparation method comprises the steps that MIL-100 (Fe) prepared through a hydrothermal method is ultrasonically dispersed in solvent, polyvinylidene fluoride and a pore-forming agent are sequentially added, stirring is conducted for 12-24 h to enable the added substances to be dissolved and blended to be uniform, and a membrane casting solution is formed; the membrane casting solution is defoamed and put on a support for membrane coating, staying of a coated membrane in the air is conducted for 30-60 s, the membrane is immersed into a coagulating bath for solvent exchange, and the polyvinylidene fluoride and metal-organic framework composite ultra-filtration membrane is obtained. The metal-organic framework material MIL-100 (Fe) is added to the composite ultra-filtration membrane, the hydrophily of the ultra-filtration membrane is improved, the separating capacity of the membrane is improved, the anti-pollution capacity of the ultra-filtration membrane is improved, the service life of the membrane is prolonged, and a good application prospect is achieved.

A liquid fluoropolymer coating composition and a process for using the composition to make fluoropolymer coated polymeric substrates. The liquid fluoropolymer composition comprises fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride polymer, solvent, and compatible adhesive polymer comprising functional groups selected from carboxylic acid, sulfonic acid, aziridine, amine, isocyanate, melamine, epoxy, hydroxy, anhydride and mixtures thereof. In the process, the composition is applied to a polymeric substrate comprising functional groups on its surface that interact with said compatible adhesive polymer to promote bonding of said fluoropolymer coating to said substrate. The solvent is removed from the coating composition applied to the substrate to form a fluoropolymer coating on the substrate.

The invention provides a polyvinylidene-fluoride-based composite fibrous membrane, which comprises a polyvinylidene fluoride fibrous layer with the thickness ranging from 5 mu m to 120 mu m, wherein the diameters of the fibers range from 80 nm to 1500 nm; the polyvinylidene fluoride fibrous layer comprises the components in percentage by mass as follows: 15%-95% of polyvinylidene fluoride and 5%-85% of a modifier; and the modifier comprises a polymer and/or inorganic oxide. The preparation method is simple and feasible; the used raw materials and equipment are cheap; the prepared composite fibrous membrane has the advantages of high porosity and membrane flux, good mechanical strength and thermal stability, uniform thickness, controllability and the like; and when applied to a lithium ion battery, the composite fibrous membrane can improve the ionic conductivity and the charge-discharge performance of the high current of the battery, and shows good electrochemical performance and circulative performance.

The invention discloses a fluorine-containing polysiloxane release agent and a preparation method thereof. The fluorine-containing polysiloxane release agent is prepared from vinyl fluoride silicone oil with an imide heterocyclic ring as a matrix matched with hydrogen-containing silicone oil, an inhibitor and a catalyst in a mixing manner. The fluorine-containing polysiloxane release agent does not utilize any solvent, so that the damage to the environment and a human body caused by an organic solvent is effectively avoided; the cured release film has a good anti-sticking effect by introducing a fluorine-containing long-chain substituent. Meanwhile, improvement of the adhesive fastness between the release agent and a polyester or polyimide film base material is facilitated by the imide heterocyclic substituent added to the vinyl fluoride silicone oil.

A process for forming a multilayer film includes coating a polymeric substrate film with a liquid fluoropolymer coating. The liquid fluoropolymer coating includes a fluoropolymer, solvent, a compatible cross-linkable adhesive polymer, and a cross-linking agent. The process further includes cross-linking the compatible cross-linkable adhesive polymer to form a cross-linked polymer network in the fluoropolymer coating, removing the solvent from the fluoropolymer coating, and adhering the fluoropolymer coating to the polymeric substrate film. A liquid fluoropolymer coating composition includes a fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride, solvent, a compatible cross-linkable adhesive polymer, and a cross-linking agent. A fluoropolymer coated film includes a polymeric substrate film and a fluoropolymer coating on the polymeric substrate film. The fluoropolymer coating includes a fluoropolymer and a compatible cross-linked adhesive polymer.

The invention discloses a PDMS/PVDF (polydimethylsiloxane/polyvinylidence fluoride) pervaporation composite membrane which comprises a polyvinylidence fluoride supporting layer and a polydimethylsiloxane separating layer with different bore diameters. The composite membrane has high separating capability and separating efficiency when applied to separating acetic acid in an acetic acid water solution. The PDMS/PVDF pervaporation composite membrane comprises a separating layer and a supporting layer, wherein the separating layer is uniformly attached on the supporting layer, the total thickness of the composite membrane is 120-150 micrometers, the thickness of the skin separating layer is 30-40 micrometers, the supporting layer is made of polyvinylidence fluoride microfiltration membranes with bore diameters being respectively 0.1-2.0 micrometers, and the separating layer is made of the polydimethylsiloxane.

The present invention provides a fluorinated polymer excellent in the crosslinking reactivity, crosslinked rubber physical properties and chemical resistance, and its crosslinked rubber.

A fluorinated polymer comprising repeating units (a) based on at least one monomer selected from the group consisting of ethylenic unsaturated compounds each having a hydroxyphenyl group, repeating units (b) based on at least one fluoromonomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, 3,3,3-trifluoropropene, 1,3,3,3-tetrafluoropropene, 1,1,2-trifluoroethylene, vinyl fluoride, 1,2-difluoroethylene and CF₂═CF—O—R^f (wherein R^f is a C_1-8 saturated perfluoroalkyl group or a perfluoro(alkoxyalkyl) group) and, if necessary, repeating units (c) based on at least one hydrocarbon monomer selected from the group consisting of ethylene, propylene and CH₂═CH—O—R¹.

The invention discloses a preparation method of heterogeneous enhanced polyvinylidene fluoride hollow fiber membrane with high bursting strength, wherein a hollow weaved pipe is used as a supporting material, a pre-coating modulated hollow weaved pipe is prepared by the steps of pre-treatment by using alkali and surfactant solution, pre-coating by using polyvinylidene fluoride solution, high-speed centrifugal separation and drying, and then the heterogeneous enhanced polyvinylidene fluoride hollow fiber membrane with high bursting strength is prepared by evenly coating polyvinylidene fluoride membrane forming solution on the surface of the hollow weaved pipe. The preparation method has simple process and low cost, and enables the heterogeneous enhanced polyvinylidene fluoride hollow fiber membrane to have the advantages of high bursting strength, high pass and high tensile strength and to be greatly improved in the shearing resistance and shock resistance.

The invention relates to a preparation method of a P(VDF-HFP) [Poly(Vinyl Fluoride-Hexafluoropropylene)] inorganic compound porous nano fiber lithium ion battery separator. The method comprises the following specific steps of: (1) adding P(VDF-HFP) and PEG (Polyethylene Glycol) into an organic solvent; heating and agitating to dissolve to form a transparent solution; cooling the solution to be at room temperature; and dispersing inorganic nano grains into the solution by agitation and ultrasonic treatment to obtain a spinning solution; (2) statically spinning the obtained spinning solution to obtain a primarily-formed P(VDF-HFP) inorganic compound porous nano fiber membrane; and (3) immersing the primarily-formed P(VDF-HFP) inorganic compound porous nano fiber membrane into distilled water to remove the PEG; and carrying out drying treatment to obtain the P(VDF-HFP) inorganic compound porous nano fiber lithium ion battery separator. The lithium ion battery separator prepared by using the preparation method disclosed by the invention has high liquid absorption rate and good electrochemical stability, and has a good heat-resisting shrinkage performance.

Nitrogen doped TiO₂ (N—TiO₂) is used to fabricate Poly(vinylene fluoride) (PVDF)/N—TiO₂ mixed matrix hollow fiber membranes (HFMs) through a phase inversion method to improve filtration efficiencies and antifouling properties. The membranes performances were evaluated based on the water permeability, humic acid (HA) rejection and antifouling properties. Resulting membranes showed brown color and improved hydrophilicity, especially under light irradiation. When compared to original PVDF and PVDF/P25 membrane, mixed matrix membranes containing N—TiO₂ nanoparticles (NPs) showed clear photocatalytic activities under visible light irradiation. Also, membrane performance assessments indicated that PVDF/N—TiO₂ membranes possessed enhanced water flux, similar HA rejection (e.g., above 96%) and improved fouling resistance with PVDF membranes as a control. The results demonstrate the potential of the suggested methodology for development of membranes with improved water permeability and superior antifouling properties based on photo-degradation processes and photo-induced hydrophilicity enhancement driven by solar light as a renewable energy source.

The invention relates to a preparation method of molecular sieves, in particular to a preparation method of mesoporous-microporous titanium silicalite molecular sieves. The method includes: uniformly mixing tetrapropylammonium hydroxide, tetrabutyl titanate, tetraethyl orthosilicate and deionized water in the mass ratio of 1:20-90:8:1500, reacting at the constant temperature of 35 DEG C prior to mixing with polymethyl vinyl fluoride, and crystallizing for 1 hour at the temperature of 140 DEG C to obtain nano-clusters; and mixing hexadecyl trimethyl ammonium bromide, the deionized water, ammonia water 25% in concentration and the polymethyl vinyl fluoride, crystallizing for 72 hours at the temperature of 120 DEG C to obtain a product, and subjecting the product to suction filtration, washing, drying at the room temperature and roasting for 4 hours at the temperature of 500 DEG C so that the mesoporous-microporous titanium silicalite molecular sieves are obtained. Experimental results show that the mesoporous-microporous titanium silicalite molecular sieves prepared by the method are large in specific surface area, and micropores are reserved in pore walls of mesopores; primary and secondary building units of TS-1 molecular sieves are successfully introduced into the pore walls of the mesoporous molecular sieves; and the mesoporous-microporous titanium silicalite molecular sieves prepared by the method has good selectivity on generation of styrene oxide in epoxidation reaction of styrene.