1824 results about "Fluoropolymer" patented technology

A production method for an aqueous dispersion according to the present invention comprises polymerizing a first monomer that includes tetrafluoroethylene in the presence of a compound represented by formula (X) and a polymerization initiator under conditions in which an aqueous medium is present but an emulsifier that includes fluorine atoms is substantially absent to produce an aqueous dispersion that includes particles of a first fluorine-containing polymer that has an average particle diameter of no more than 500 nm and does not have a melting point.　Formula (X): C(X1)(X2)=C(X3)-L-Z. In formula (X), X1, X2, and X3 are each independently a hydrogen atom, a fluorine atom, a perfluoromethyl group, or an alkyl group, L is a single bond or a divalent linking group, and Z is an anionic group or a salt of an anionic group.

An antenna assembly may include a housing including a radome having at least an outer layer made of a melt-processable fluoropolymer material. The antenna assembly may further include an antenna system disposed within the housing.

The invention discloses a scratch repair coating and a preparation method thereof, and relates to the technical field of high polymer materials. When the scratch repair coating is prepared, hydroxylated boron nitride reacts with 1-(3-triethoxysilylpropyl)-2-imidazoline to prepare pre-modified boron nitride, and then the pre-modified boron nitride and 4-chloro-1-butene are subjected to quaternization to prepare modified boron nitride; the preparation method comprises the following steps: reacting styryl phosphonic dichloride with 4, 4, 5, 5, 6, 6, 7, 7, 7-nonafluoro-1, 2-heptanediol to prepare a hydroxyl-terminated phosphorus-fluorine-containing polymer; the preparation method comprises the following steps: reacting isophorone diisocyanate with a hydroxyl-terminated phosphorus and fluorine-containing polymer to prepare a polyurethane prepolymer; reacting the polyurethane prepolymer with hydroxyl-terminated coumarin to generate modified polyurethane; and uniformly mixing the modified polyurethane, the modified boron nitride and a photoinitiator to prepare the scratch repair coating. The scratch repairing coating prepared by the invention has good self-repairing performance, flame retardant property, corrosion resistance and mechanical property.

The present invention provides a slurry composition comprising (a) an electrochemically active material and / or an electrically conductive agent; and (b) a binder comprising (i) a polymer comprising a fluoropolymer dispersed in a liquid medium; and (ii) a polymer comprising an addition polymer comprising constitutional units comprising the residue of a heterocyclic group-containing ethylenically unsaturated monomer. The present invention also provides electrodes and electrical storage devices.

The invention relates to an in-situ polymerized flame-retardant perfluorogel electrolyte, a lithium metal battery and a preparation method, the in-situ polymerized flame-retardant perfluorogel electrolyte is prepared from a fluorinated organic solvent, a lithium salt, a fluorine-containing polymer precursor and a thermal initiator, and the fluorine-containing polymer precursor further comprises a fluorine-containing polymer and a cross-linking agent. Compared with the prior art, the composite material has a high electrochemical window and excellent flame retardant property, and can realize matching with a high-voltage high-nickel positive electrode at room temperature and stable circulation of a high-voltage lithium metal battery; the preparation method is simple, the interface performance is optimized, and large-scale preparation is easy to realize.

The invention discloses a method for preparing low-viscosity vinyl fluorine-containing hyperbranched organic silicon resin, and belongs to the technical field of organic polymer materials. The low-viscosity vinyl fluorine-containing hyperbranched organic silicon resin is prepared by taking a vinyl-containing siloxane monomer, an alkyl-containing siloxane monomer and a fluorine-containing siloxane monomer as raw materials through hydrolysis nucleation, condensation growth, end capping and purification treatment. Wherein the content of vinyl is not lower than 3 wt%, the content of fluorine is not lower than 15 wt%, and the viscosity is not higher than 1000 mPa.s. The vinyl fluorine-containing hyperbranched organic silicon resin disclosed by the invention is used as a material with excellent characteristics of both vinyl organic silicon resin and a fluorine-containing polymer, the existence of vinyl can be suitable for various reaction conditions, the existence of a fluorine-containing group enables the vinyl fluorine-containing hyperbranched organic silicon resin to have excellent hydrophobic and oleophobic properties, and meanwhile, the fluorine-containing polymer material is relatively small in friction coefficient, so that the vinyl fluorine-containing hyperbranched organic silicon resin can be applied to various reaction conditions. The method has great application potential in the fields of oil-resistant sealing, anti-corrosion coatings, electronic materials, medical apparatuses and instruments and the like.

The present invention provides a method for manufacturing a dried ion exchange membrane that can manufacture a water electrolysis device having suppressed liquid leakage.　The method for producing a dried ion exchange membrane according to the present invention is a method in which a wet ion exchange membrane, which was obtained as a result of an ion exchange membrane that includes a fluoropolymer having ion exchange groups being wetted using a liquid medium, is dried to remove the liquid medium, thereby obtaining a dried ion exchange membrane, wherein the wet ion exchange membrane is dried from a state where the amount of the liquid medium adhering to the surface of the wet ion exchange membrane is 40 g / m2 to 600 g / m2.

The invention discloses a method for preparing a polymer anti-pollution membrane, which is characterized in that a'fluorine-containing polymer / styrene-maleic anhydride 'porous membrane is prepared by taking a styrene-maleic anhydride copolymer and a fluorine-containing polymer as base materials and adopting a thermally induced phase separation technology. And loading chitosan on the surface of the porous membrane by utilizing a chemical reaction between anhydride on the surface of the membrane and a small part of amino groups in a chitosan chain. The chitosan molecular chain with pH responsiveness not only improves the hydrophilicity of the membrane and slows down the deposition of inorganic scales on the surface of the membrane, but also has the conformation subjected to'curl-stretch 'reversible transformation (similar to'curl-stretch' motion of earthworms in soil so as to soften the soil) in the'acid washing-alkali washing 'cleaning process of the membrane; hardened inorganic scale deposited on the surface of the membrane becomes loose, the binding force between the inorganic scale and the surface of the membrane becomes weak, and the inorganic scale can be effectively removed through surface water cleaning in the follow-up process. The prepared cleaning agent has the advantages of being high in pollution resistance, good in inorganic dirt removal effect after cleaning and the like.

The invention belongs to the technical field of paint coatings, and particularly relates to a hydrophobic heat-conducting self-repairing coating and a preparation method thereof. The preparation method of the hydrophobic heat-conducting self-repairing coating comprises the following steps: ultrasonically dispersing a heat-conducting filler and polyethylene glycol in an organic solvent, dropwise adding into a water-borne epoxy resin solution, and stirring to obtain a heat-conducting coating solution; the method comprises the following steps: dropwise adding a liquid A containing polysiloxane and a fluorine-containing monomer into a liquid B containing polyethylene glycol, stirring, carrying out centrifugal suction filtration, and drying to obtain the self-repairing microcapsule. Then adding the self-repairing microcapsules and silicon dioxide into the fluorine-containing polymer solution and / or the hydrophobic resin solution, and carrying out ultrasonic dispersion to prepare a self-repairing hydrophobic coating solution; the heat-conducting coating liquid and the self-repairing hydrophobic coating liquid are uniformly sprayed or spin-coated on the surface of a metal base material in sequence and then are subjected to UV curing, and the hydrophobic heat-conducting self-repairing coating is prepared. According to the method, the process and raw materials are simple, and the prepared coating has heat conduction and self-repairing performance and is excellent in anti-aging performance.

The invention provides a diaphragm and a battery, the diaphragm comprises a base material layer and a coating layer located on one side surface or two side surfaces of the base material layer, the coating layer comprises a first coating layer and a second coating layer, the first coating layer comprises first particles with the component of an organic compound, and the second coating layer comprises second particles with the component of an organic compound. The unit molecular structure of the organic compound comprises at least one of a carbon-carbon double bond, a phosphorus-oxygen double bond, a carbon-nitrogen double bond, a carbon-sulfur double bond and a carbon-oxygen double bond; the second coating is of a porous structure formed by taking a fluorine-containing polymer as a continuous phase, through holes are formed in the surface of the second coating, and in the 100 [mu] m * 100 [mu] m area of the surface of the second coating, the orthographic projection area of the through holes on the base material layer and / or the first coating accounts for 10%-90% of the surface area of the diaphragm. According to the diaphragm and the battery, the stability of the CEI membrane at high temperature can be improved, the rupture of the CEI membrane is reduced or even avoided, and the high-temperature intermittent cycle capacity retention rate and the recovery capacity retention rate after high-temperature storage of the battery are improved.

The invention belongs to the technical field of polymer composite materials, and particularly relates to an oil-resistant interior material. The material comprises a porous base material layer, a fluorine-containing polymer and organic silicon resin blended oil-resistant functional layer and a micro-nano structure layer with a periodic micro-bulge array, surface modified nanoparticles are distributed in the functional layer in a gradient manner, and the micro-bulge surface is covered with a perfluoropolyether / fluorinated silicon dioxide composite coating; through a synergistic effect of a low-surface-energy oleophobic interface formed through chemical bonding and curing and a micro-structure capillary lifting effect, anti-permeation barrier of high-viscosity grease is realized, and meanwhile, mechanical wear resistance and thermal stability are improved by virtue of a nano-particle enhanced cross-linked network; and continuous imprinting and an ultraviolet-thermal dual-curing process are combined to achieve high-efficiency manufacturing with zero solvent residue, and finally the interior material with long-acting oil resistance, high environmental tolerance and industrial mass production feasibility is obtained.

The invention relates to the field of sewage purification, in particular to a fluorine-containing polymer chemical sewage environment-friendly purification device which comprises a fixed seat, a box body, a cover plate, a water inlet pipe, a water outlet pipe and the like, the fixed seat is fixedly connected with a box body made of a toughened glass material; the box body communicates with a water inlet pipe; the box body communicates with a water outlet pipe; the system further comprises an illumination sensor and the like. An annular groove is formed in the box body; the cover plate is fixedly connected with an illumination sensor. When sunlight is strong in daytime, the lamp tube is turned off, the electromagnet is powered on, the electromagnet and the magnetic attraction block attract each other under the action of magnetic force, then the electric guide rail I is controlled to enable the moving block I to drive the lamp tube to rotate, and then the lamp tube enables the electromagnet and the magnetic attraction block to pull the filter film which is in a folded state initially till the filter film is in an unfolded state; furthermore, strong sunlight is filtered through the light filtering film, so that the intensity of light entering the box body is reduced, and the situation that algae organisms are damaged by too strong sunlight and the activity of the algae is reduced is avoided.

A method for producing a fluoroelastomer is provided by which a fluoropolymer having excellent dispersion stability in water can be efficiently produced using an aqueous medium having a reduced environmental burden and without essentially requiring an emulsifier.　The method for producing a fluoroelastomer comprises polymerizing monomers including TFE and PAVE in an aqueous dispersion that contains substantially no water-soluble emulsifier and comprises an aqueous medium and a first fluoropolymer, which includes TFE units and PAVE units, thereby producing a second fluoropolymer. In the first fluoropolymer, the proportion of the PAVE units to the sum of the TFE units and the PAVE units is 20-95 mol%. In the second fluoropolymer, the proportion of PAVE units to the sum of TFE units and the PAVE units is 20-95 mol%. Before initiation of the polymerization of the monomers, the content of the first fluoropolymer is 0.01-4.0 mass% with respect to the mass of the whole aqueous dispersion.

The invention relates to a preparation method of a hydrophobic and oleophobic PTFE membrane, and belongs to the technical field of PTFE membrane preparation. Aiming at the problems that an existing PTFE membrane is difficult to construct a micro-nano multi-stage coarse structure and has a synergistic effect with low chemical surface energy, the hydrophobic and oleophobic properties are insufficient and the structural stability is poor, the key points of the technical scheme provided by the invention are as follows: firstly, carrying out ethanol ultrasonic cleaning on a PTFE base membrane of 20-30 microns, and carrying out vacuum plasma treatment to form a nano coarse structure and oxygen-containing polar group active sites; then, under the protection of nitrogen, immersing into an ethanol solution containing perfluorodecyltriethoxysilane, dibutyltin dilaurate and nano cellulose whiskers, carrying out hot-pressing compounding with PET non-woven fabric, carrying out heat treatment, and finally, coating with a fluorine-containing polymer nano fiber layer through an electrostatic spinning process; the composite hydrophobic layer with the synergistic effect of a micro-nano multistage coarse structure and chemical low surface energy is formed, the water contact angle is larger than or equal to 155 degrees, and the oil contact angle is larger than or equal to 130 degrees. The PTFE film prepared by the preparation method can be used in the fields of waterproof breathable materials, self-cleaning surfaces, oil-resistant packaging and the like.

The invention provides a single battery, a battery device and a power utilization device, the single battery comprises a laminated electrode assembly, the laminated electrode assembly comprises a positive pole piece, an isolating membrane and a negative pole piece which are laminated, the negative pole piece comprises a negative current collector and a negative membrane layer arranged on at least one side of the negative current collector, the positive pole piece comprises a positive pole current collector and a positive pole film layer arranged on at least one side of the positive pole current collector, the positive pole film layer comprises a positive pole active material, the positive pole active material comprises lithium-containing transition metal phosphate particles, the compaction density of the positive pole piece is 2.25-2.65 g / cm < 3 >, and the lithium-containing transition metal phosphate particles are uniformly distributed on the positive pole piece. In a sphericity-like area cumulative distribution curve of particles obtained by a tangent plane of the positive electrode film layer along the thickness direction of the pole piece, the sphericity-like degree LA50 is 0.70-0.75, the isolation film comprises a base film and coatings arranged on two sides of the base film, and a bonding layer in each coating is a porous structure continuous layer and comprises a fluorine-containing polymer. The battery monomer disclosed by the invention can give consideration to both energy density and cycle performance.

The invention discloses a preparation method of a weather-resistant toughened nylon 66 material, and relates to the technical field of high polymer material preparation. The method is realized through the following steps: A, preparing modified titanium dioxide powder with a coating structure; b, weighing and mixing; and C, melt extrusion. According to the invention, the modified titanium dioxide powder which takes nano titanium dioxide as a matrix, is coated with the fluorine-containing polymer on the surface and improves the stability of the coating structure by means of gamma ray irradiation is added into the nylon 66 material, so that the long-term weather resistance and toughness of the nylon 66 material are improved at the same time; according to the nylon 66 material, the advantages of long-term weather resistance and toughness of the nylon 66 material coexist successfully, weather-resistant toughening modification of the nylon 66 material is smoothly realized, meanwhile, the rigidity is not obviously reduced, good rigidity and toughness can still be kept after long-term use, the comprehensive performance is excellent, and the high requirement of emerging industries for long-term use performance of the nylon 66 material is met; and development of emerging industries in China is promoted.

The invention relates to the field of waste polymer material recovery and resource utilization, and particularly discloses a method for realizing ultra-fast recovery of fluorine-containing organic waste through a self-propagating reaction. According to the method, liquid sodium-potassium alloy (NaK) is used as a reaction medium, under the protection of inert atmosphere, fluorine-containing organic solid waste is in contact with NaK, electron transfer is induced through mechanical friction, C-F bond breakage is catalyzed and induced, a defluorination reaction is triggered, reaction heat is released, a self-propagating combustion reaction is initiated, and finally, carbon materials and metal fluoride products are recycled. The method is rapid in reaction, does not need external heating, can efficiently recover fluorine-containing waste and prepare high-added-value materials, and is suitable for green large-scale treatment of waste fluoropolymers and preparation of functional materials.

The invention discloses a nuclear radiation resistant heat-insulating protective coating for steam pipelines and a preparation method thereof. The coating comprises a surface layer and a bottom layer; the surface layer comprises 30 to 50 parts of a surface layer base, 10 to 30 parts of pigments and fillers, 5-10 parts of metal powder, 18 to 20 parts of a curing agent and 18 to 20 parts of a diluent; the bottom layer comprises 10 to 30 parts of a bottom layer base, 30 to 50 parts of pigments and fillers, 5-10 parts of metal powder, 18 to 20 parts of a curing agent and 18 to 20 parts of a diluent; wherein the surface layer base comprises acrylic modified organic silicon resin; the bottom layer base comprises water glass; the pigments and fillers comprise enamel powder, ceramics and auxiliary fillers; the auxiliary fillers comprise one or more of mica, iron oxide, zinc titanate, fluoropolymer and borosilicate; the coating of the invention can effectively insulate and protect the steam pipeline in a high temperature and nuclear radiation environment, thereby extending the service life of the steam pipeline and improving the safety and reliability of the nuclear power plant.

Provided is a fluorine-containing polymer having water repellency and photosensitivity equivalent to those of a conventional fluorine-containing polymer and capable of being decomposed at a lower temperature.　A fluorine-containing polymer according to the present disclosure contains a repeating unit represented by general formula (1) or (1)'. (In general formula (1), R1 is a hydrogen atom, a fluorine atom, a chlorine atom, or a C1-10 straight-chain or C3-10 branched alkyl group. Some or all of hydrogen atoms bonded to carbon atoms in the alkyl group may be substituted with fluorine atoms. In general formula (1), R2 is a single bond, an alkylene group which may have a straight-chain, branched, or cyclic structure, an aromatic ring, an ester, a carbonyl, an ether, an amide, an amine, or a composite substituent thereof, and a part thereof may be fluorinated and / or chlorinated. In general formula (1)', R1a is a C1-10 straight-chain or C3-10 branched alkyl group. Some or all of hydrogen atoms bonded to carbon atoms in the alkyl group may be substituted with fluorine atoms and / or chlorine atoms. In general formula (1)', R2a is an alkylene group which may have a straight-chain, branched, or cyclic structure, an aromatic ring, an ester, a carbonyl, an ether, an amide, an amine, or a composite substituent thereof, and a part thereof may be fluorinated and / or chlorinated. In general formula (1)', R2b is an alkylene group which may have a straight-chain, branched, or cyclic structure, an aromatic ring, an ester, a carbonyl, an ether, an amide, an amine, or a composite substituent thereof, and a part thereof may be fluorinated and / or chlorinated. In general formulae (1) and (1)', X is a hydroxyl group, an alkoxy group, an oxycarbonyl group, an oxysulfonyl group, an oxycarboxy group, or a hydrogen atom. In general formulae (1) and (1)', n is a natural number of 1-3.)

The invention discloses a step-by-step polymerization preparation method of fluorinated ethylene propylene, and relates to the technical field of fluorine-containing polymers. According to the method adopted by the invention, ternary polymerization and ternary polymerization are divided into two steps, the first step is copolymerization of tetrafluoroethylene (TFE) and a perfluorovinyl ether monomer, the reaction can be carried out under lower pressure, the concentration of the TFE monomer is lower at the moment, and the polymerization reaction can be carried out according to a preset proportion only by a small amount of the perfluorovinyl ether monomer; the polymer emulsion with very small particle size is obtained. And 2, adding a certain amount of hexafluoropropylene (HFP) into the polymer emulsion, and continuously carrying out polymerization reaction to obtain the final fluorinated ethylene-propylene emulsion. A step-by-step polymerization process is adopted, so that the loss of a perfluorovinyl ether monomer in a fluorinated ethylene propylene ternary polymerization process is reduced, and the production cost is effectively reduced; the step-by-step polymerization can shorten the time of the second-step polymerization reaction and improve the production efficiency.

The invention relates to a solid-state electrolyte membrane, a preparation method thereof and a solid-state battery, and belongs to the technical field of solid-state electrolyte materials. The solid electrolyte membrane is provided with a honeycomb structure framework, and the honeycomb structure framework is filled with a lithium-conducting copolymer and a lithium salt; the honeycomb structure framework is prepared from the following raw materials: a fluorine-containing polymer, an inorganic nano filler and a lithium-conducting polymer. The solid electrolyte membrane prepared by the embodiment of the invention meets at least one of the following indexes: the thickness of the solid electrolyte is 1-30 [mu] m, and the conductivity at room temperature is gt; 5.0 * 10 <-4 > S.cm <-1 >, and the ion transference number is gt; and 0.80, so that an ultrathin solid electrolyte structure which has rapid lithium ion transmission, high mechanical strength and a stable interface is obtained.

An anti-icing coating having a continuous phase and a discrete phase. The continuous phase includes a fluorine-containing polymer formed from a fluorine-containing precursor having a functionality greater than 2. The discrete phase includes a plurality of domains having a fluoride-free hygroscopic and / or hydrophilic material. The plurality of domains are dispersed within and immersible in the continuous phase. At least a portion of the fluorine-free material is bonded to the fluorine-containing polymer via an isocyanate-containing moiety. The fluorine-containing polymer is crosslinked with a crosslinking molecule having at least four functional groups. The fluorine-free material is poly (ethylene glycol).

The invention relates to the technical field of electric wires and cables, and discloses a fluoroplastic insulating high-temperature-resistant fireproof cable and a preparation method thereof.The cable comprises a conductor layer, the conductor layer is formed by twisting multiple strands of copper wires, the periphery of the conductor layer is coated with a fluoroplastic insulating layer, the periphery of the fluoroplastic insulating layer is coated with a shielding layer, and the shielding layer is arranged on the periphery of the conductor layer. The shielding layer is of a copper strip braided structure, the periphery of the shielding layer is coated with an armor layer, the armor layer is braided by stainless steel wires, the periphery of the armor layer is coated with a sheath layer, and the sheath layer comprises the following components in parts by mass: 50-70 parts of functionalized ethylene-tetrafluoroethylene copolymer. According to the invention, an interpenetrating polymer network formed by in-situ crosslinking of the functionalized fluoropolymer and the organosilicon elastomer is constructed in the sheath layer, and an energy field gradient response vulcanization process is adopted, so that the prepared cable sheath maintains the inherent high temperature resistance of fluoroplastic, and the flexibility and mechanical strength of the material are improved at the same time.

The invention belongs to the technical field of coatings, and provides an environment-friendly solvent-free coating composition for a metal surface and a preparation method of the environment-friendly solvent-free coating composition. According to the coating composition, through the synergistic effect of the fluorine-containing polymer, the fluorinated polyester and the modified polyurethane, the corrosion resistance and the environmental stability of a coating are improved. Firstly, perfluoromethyl vinyl ether and triethanolamine react under the action of a catalyst to prepare a fluorine-containing polymer, and a three-dimensional cross-linked network structure of the fluorine-containing polymer endows a coating with hydrophobicity and chemical inertness; secondly, fluorinated polyester is prepared through free radical polymerization, and the surface energy is reduced through a perfluorinated chain segment; finally, modified polyurethane is prepared through polycaprolactone glycol, single-terminal dihydroxyl polydimethylsiloxane and the like, the surface energy is reduced through a silicon-oxygen chain segment of the modified polyurethane, and the oxidation resistance is improved through a thioether bond. The coating composition shows excellent water resistance, oxidation resistance and chemical corrosion resistance, has excellent mechanical property and adhesive force, and is suitable for protecting a metal substrate in a severe environment for a long time.

The invention provides a bamboo-based hard carbon material for a sodium ion battery and a preparation method of the bamboo-based hard carbon material. The bamboo-based hard carbon material is prepared from raw materials as follows: bamboo fibers, a pore forming agent and a fluorine-containing polymer, wherein the mass ratio of the natural bamboo fibers to the pore-forming agent is (0.8-1.2): 1. The bamboo-based hard carbon material is prepared by using the raw bamboo fibers as raw materials, pretreating the raw bamboo fibers and then performing pyrolysis treatment; the prepared bamboo-based hard carbon material is characterized in that the carbon layer spacing d002 is 0.376 to 0.399 nm. According to the preparation method disclosed by the invention, the bamboo-based hard carbon material prepared by selecting specific natural bamboo fibers and controlling preparation conditions such as temperature, time, heating rate and atmosphere in pyrolysis treatment has proper specific surface area, carbon layer spacing, pore structure and closed pore content. The bamboo-based hard carbon material disclosed by the invention is applied to a sodium ion battery and has excellent electrochemical properties such as reversible capacity, first-circle coulombic efficiency and rate capability.

The application discloses a method for preparing a low-viscosity vinyl fluorine-containing hyperbranched silicone resin and belongs to the technical field of organic polymer materials. The low-viscosity vinyl fluorine-containing hyperbranched silicone resin is prepared from a vinyl-containing siloxane monomer, an alkyl-containing siloxane monomer and a fluorine-containing siloxane monomer as raw materials through hydrolysis nucleation, condensation growth, end capping and purification treatment, wherein the vinyl content is not less than 3 wt%, the fluorine content is not less than 15 wt% and the viscosity is not higher than 1000 mPa.s. The vinyl fluorine-containing hyperbranched silicone resin has excellent properties of both a vinyl silicone resin and a fluorine-containing polymer, the existence of the vinyl group can be suitable for various reaction conditions, the existence of the fluorine-containing group makes the hydrophobic and oleophobic properties excellent, and the friction coefficient of the fluorine-containing polymer material is small, so that the vinyl fluorine-containing hyperbranched silicone resin has great application potential in the fields of oil-resistant sealing, anticorrosion coating, electronic materials, medical devices and the like.

A composition includes (A) a propylene-based polymer, (B) a flame retardant composition and (C) an anti-drip agent in the form of particles comprising a fluoropolymer and having an average particle size as determined in accordance with ISO13320:2020 of 0.1 to 50 μm.

The invention relates to an electrode plate, a battery and an electric device. The electrode pole piece comprises a current collector and a film layer arranged on at least one side of the current collector, the film layer comprises an active substance and multiple fluorinated polymers, the crystallinity of one of the multiple fluorinated polymers is marked as Xc < 1 >%, the cold crystallization temperature is marked as Tc < 1 > DEG C, the crystallinity of the other one of the multiple fluorinated polymers is marked as Xc < 2 >%, and the cold crystallization temperature is marked as Tc < 1 > DEG C. The cold crystallization temperature is recorded as Tc2 DEG C, and the various fluorinated polymers meet the following conditions: (Xc2-Xc1) / Xc1 is more than or equal to 20% and less than 400%, and (Tc2-Tc1) / Tc1 is more than or equal to 30% and less than 250%.

The invention provides a fluorine-containing polymer wetting reversal agent suitable for shale reservoir protection as well as a preparation method and application of the fluorine-containing polymer wetting reversal agent. The preparation method of the reverse wetting agent comprises the following steps: adding ethylamine, triethylamine and deionized water into a reaction flask, and adding perfluorooctanoyl chloride into the system for reaction; after the reaction is completed, potassium hydroxide and 2-chloroethanol are continuously added for reaction; and after the reaction is completed, obtaining the N-ethyl-N-hydroxyethyl perfluorooctanamide. Adding nanoparticles, a silane coupling agent and ammonia water into the dispersant solution, and carrying out a modification reaction to obtain a modified nanoparticle solution; and adjusting the pH value of the obtained modified nanoparticle solution to 5-9, adding N-ethyl-N-hydroxyethyl perfluorooctanamide, introducing nitrogen to remove oxygen, adding an initiator, and carrying out thermal initiation polymerization reaction to obtain the composite material. The wetting reversal agent disclosed by the invention has excellent wetting reversal performance and a certain filtration reduction effect, and provides innovative thinking for development of a high-performance water-based drilling fluid technology.

A method for producing a fluoropolymer aqueous dispersion, including a step A of subjecting a pre-treatment aqueous dispersion containing a fluoropolymer obtained by polymerization in the presence of a hydrocarbon surfactant to ultrafiltration, microfiltration, or dialysis membrane treatment, or a combination thereof. The ultrafiltration is performed using an ultrafiltration membrane having a molecular weight cutoff of 0.3×104 Da or more.