55 results about "Hexafluoropropylene" patented technology

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 invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.

This invention relates to "an efficient and safe method for synthesizing perfluoropentanone," belonging to the field of organic chemical synthesis. The method for synthesizing perfluoropentanone is characterized by the following steps: under the action of hexafluoropropylene CF2=CF-CF3, fluorophosgene CF2O, and trifluorobromomethane CF3Br, perfluoropentanone (C5F) is generated in the gas phase. 10 O. The raw materials of this invention are inexpensive and readily available; the product separation and purification are simple; it is easy to industrialize; and it produces less industrial waste.

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.

To provide a method for producing hexafluoropropene in which the formation of octafluorocyclobutane, a by-product, is suppressed, and a composition obtained by the said production method. [Solution] A method for producing hexafluoropropene, comprising preheating trifluoromethane at a first preheating temperature of 350 to 700°C, then contacting it with tetrafluoroethylene to obtain a product containing hexafluoropropene.

The present application relates to the technical field of fluorinated chemical industry, and particularly relates to a method for removing perfluoroisobutene in mixed gas, comprising the following steps: passing the mixed gas containing perfluoroisobutene through a perfluoroisobutene absorption membrane to remove perfluoroisobutene therein; wherein the perfluoroisobutene absorption membrane comprises a perfluoroisobutene absorbent, the perfluoroisobutene absorbent comprises solid alcohol and solid acid, and the mass ratio of the solid alcohol to the solid acid is (70-95):(5-30). The method can completely absorb perfluoroisobutene in the mixed gas, the crude cracking gas generated in the process of producing hexafluoropropylene by thermal cracking is treated by the method, the perfluoroisobutene removal effect is good, the cracking gas is not polluted, no additional purification operation is needed, the utilization rate of the absorbent is more than 90%, and the method has good popularization and application value.

The invention relates to the technical field of fluororubber processing, in particular to a fluororubber sealing element resistant to electrolyte corrosion and a preparation method of the fluororubber sealing element. The fluororubber is prepared from the following raw materials in parts by weight: 100 parts of fluororubber, 10-15 parts of polytetrafluoroethylene micro powder, 4-8 parts of an acid acceptor, 5-7 parts of magnesium-aluminum hydrotalcite, 3-5 parts of polyhedral oligomeric silsesquioxane, 35-40 parts of inorganic filler, 30-35 parts of carbon black, 8-10 parts of an active agent, 2-5 parts of a peroxide vulcanizing agent and 2-5 parts of a cross-linking agent. The fluororubber is composed of low-fluorine-content binary fluororubber and a polyvinylidene fluoride-hexafluoropropylene copolymer, through the synergistic effect of all the components, the volume swelling rate of the sealing element is controlled to be 8% or below under the condition that the sealing element is soaked in an electrolyte at the temperature of 85 DEG C, and the compression set is reduced to be within 15%; and after accelerated aging for 1000 hours, excellent elastic recovery capability and interface sealing pressure are still maintained. The sealing element has the wide temperature range adaptability of-20 DEG C to 200 DEG C and good mechanical strength, and the problem of size instability caused by swelling and softening of traditional fluororubber is effectively solved.

The present application relates to the technical field of solid-state battery materials, and particularly relates to a preparation method of a nontronite-coated LLZTO-based composite solid-state electrolyte film and application thereof. The preparation method comprises the following steps: 1) mixing nontronite and LLZTO in the presence of a dispersion medium, ball milling, drying, and obtaining a composite filler coated with nontronite on the surface; 2) mixing the composite filler in step 1) and polyvinylidene fluoride-hexafluoropropylene and lithium bis-trifluoromethanesulfonimide in the presence of a solvent, and obtaining an electrolyte slurry; 3) solution casting the electrolyte slurry in step 2), and vacuum drying to obtain a composite solid-state electrolyte film. The P-CPE electrolyte film of the present application is used in a solid-state lithium battery, can construct a continuous and stable ion transmission channel, homogenize lithium ion flux, inhibit dendrite growth, and exhibit excellent cycle stability and rate performance.

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.

Disclosed is a separator for an electrochemical device, an electrochemical device comprising the same, and a method for manufacturing the same. The separator for the electrochemical device can improve resistance and maintain porosity after lamination by including a polyvinylidene-containing binder containing a low content of hexafluoropropylene and / or a polyolefin-containing binder.

A method of separating perfluorotripropylamine from a mixture B, the mixture B containing perfluorotripropylamine and a mixture A containing at least one selected from the group consisting of a hexafluoropropene trimer represented by C9F18, a perfluoroalkene ether, and a perfluoropolyether, where a coagulation point of the mixture A is a temperature equal to or less than a coagulation point of the perfluorotripropylamine, and separating the perfluorotripropylamine from the mixture A is carried out at a temperature equal to or less than the coagulation point of the perfluorotripropylamine.

This invention belongs to the field of perfluoropentanone preparation technology, specifically relating to a continuous production process for perfluoropentanone. The continuous production process for perfluoropentanone includes the following steps: a fluorination catalyst is loaded into a reaction tube, purged with nitrogen, and a preheated mixture of hexafluoropropylene and trifluoroacetyl fluoride is introduced into the reaction tube for continuous reaction. Part of the reacted gas is condensed to obtain the target product, perfluoropentanone, while the other part is recycled back to the mixing and preheating stage. This continuous production process for perfluoropentanone uses hexafluoropropylene and trifluoroacetyl fluoride as raw materials, and employs a one-step gas-phase continuous flow method to rapidly synthesize perfluoropentanone under the action of a MgF2-based fluorination catalyst. No solvent is required, and the trifluoroacetyl fluoride raw material is a byproduct of the preparation of hexafluoropropylene oxide, making the raw materials readily available. The process route is simple, with high conversion rate and high selectivity, facilitating large-scale industrial production.

The present disclosure relates to an organic-inorganic composite membrane for a secondary battery including: a porous matrix containing a fluorine-based copolymer and lithium-lanthanum-zirconium-based oxide particles; and a crosslinked network polymer electrolyte filling one or more pores of the porous matrix, wherein the fluorine-based copolymer contains 10 to 25 wt % of a hexafluoropropylene-derived repeating unit, a method for manufacturing the same, and a lithium secondary battery including the same.

This invention relates to the field of polymer composite materials technology, specifically to a high wear-resistant cable material based on carbon fiber reinforcement and its preparation method. The material comprises the following raw materials in parts by weight: 40-60 parts impact-resistant copolymer polypropylene, 15-20 parts carbon fiber, 8-15 parts additive A, 8-12 parts additive B, 4-6 parts plasticizer, and 1.5-2 parts antioxidant. In this invention, additive A, through a carbon sphere precursor and modified bismuth selenide, constructs a reinforced wear-resistant structure, inhibiting interfacial debonding and particle shedding during friction, while simultaneously improving the overall rigidity and scratch resistance of the material. This structurally enhances the wear life and mechanical stability of the cable material. Additive B, prepared by combining tungsten disulfide and polyvinylidene fluoride-hexafluoropropylene copolymer-based additives, forms a self-lubricating wear-resistant network, improving the wear resistance, aging resistance, and dimensional stability of the cable material under dynamic friction and complex working conditions.

The present application relates to the technical field of polyethylene production, in particular to an additive for inhibiting black particles generated in the polyethylene granulation process and a preparation method thereof. The additive comprises the following components: vinylidene fluoride and hexafluoropropylene; the fluorine content in the additive is 30-60% by mass fraction. The additive preparation method comprises the following steps: taking vinylidene fluoride material and hexafluoropropylene material, preparing an oil by an emulsion polymerization method or a free radical solution polymerization method, cleaning the oil with pentane, and drying until the mass is constant to obtain the additive. The additive effectively reduces the number of black particles generated in the polyethylene granulation process, can improve the tensile strength and light transmittance of film products, delays the melt rupture, improves the energy utilization efficiency, and reduces the production cost, energy consumption and material consumption.

The application discloses a lead acid battery negative lead paste, a preparation method and a negative electrode, and belongs to the technical field of storage batteries. The negative lead paste comprises, in parts by mass, lead powder 1000 parts, sulfuric acid 80-100 parts, water 100-120 parts, short fibers 0.5-1 part, acetylene black 2-3 parts, barium sulfate 10-12 parts and a hybrid expansion agent 0.3-1 part. The hybrid expansion agent comprises modified lignin and core-shell ceramic microbeads. The modified lignin is prepared from sodium lignosulfonate through maleic anhydride-acrylamide binary graft copolymerization; and the core-shell ceramic microbead takes hollow ceramic microbead as a core and is coated with a polyvinylidene fluoride-hexafluoropropylene copolymer shell layer with grafted sulfonic acid groups. The application introduces the hybrid expansion agent with a specific structure, solves the problems of easy elution of traditional organic expansion agents and poor compatibility of inorganic expansion agents, and significantly improves the durability of the lead paste and the cycle life of the battery.

A tetrafluoroethylene-propylene copolymer with a solidification point monomer is mixed with a five-membered copolymer of vinylidene fluoride (VDF), hexafluoropropylene (HFP), tetrafluoroethylene (TFE), perfluorinated methyl vinyl ether (PMVE), and ethylene (PE), using a peroxide as an initiator and an aid TAIC as a crosslinking agent, and the resulting co-solidified fluoroelastomer shows improved curing performance, improved mechanical properties, and improved compression set. The co-solidified fluoroelastomer shows improved chemical resistance to solvent aging systems, and better retention of mechanical properties after high temperature aging in solvent systems.

Disclosed herein are artificial solid electrolyte interphase (ASEI) or protective film compositions that include: one or more polymers, where the one or more polymers are selected from poly vinylidene fluoride (PVDF), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF- HFP), polyaniline (PAN), PEG-based polymers, poly(ethylene glycol) methyl ether acrylate polymers, poly(ethylene oxide) (PEO), and poly(ethylene glycol) methyl ether acrylate; one or more inorganic lithium salts, where the one or more inorganic lithium salts are selected from LiTFSI, LiFSI, LiCIO4, LiF, and LiNO3; one or more initiators, where the initiators are selected from photo initiators, thermal initiators, and mixtures thereof; one or more particles, where the one or more particles are selected from Li6.4La3Zr1.4Ta0.6O12 and Li6.4+xAxLa3Zr16O12, where A is selected from Ga, Al, and Fe, and where x is a real number from 0 to 1; and one or more additives.

A simple, safe, and industrially feasible method for manufacturing trifluoroacetyl fluoride (TFAF) and carbonyl fluoride (COF2) is provided. One method for manufacturing trifluoroacetyl fluoride and carbonyl fluoride comprises the following steps: introducing at least one reactant selected from hexafluoropropylene and hexafluoropropylene oxide with oxygen and a diluent compound into a reactor to obtain a product gas containing trifluoroacetyl fluoride and carbonyl fluoride.

This invention relates to the field of lithium-ion battery technology, specifically to an adhesive for coated separators, its preparation method, and its application. The adhesive for coated separators includes a main agent and additives, wherein the weight ratio of the main agent to the additives is (1-2):(8-9). The main agent is one or more of the following: cross-linked acrylate copolymer, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride-trifluorochloroethylene copolymer, polyethylene oxide, polyethylene wax, polypropylene oxide, polyetherimide, polyacrylonitrile, and polyaniline. The additives include the following components in parts by weight: 0.1-5 parts of dispersant, 0.05-1 part of surfactant, 0.05-3 parts of thickener, and 91-95 parts of ceramic particles. Through a dispersant-PMMA pretreatment process, ultra-uniform dispersion and strong interfacial bonding of ceramic particles in the polymer are achieved, eliminating the risk of coating cracking and peeling. The uniformly distributed ceramic particles form a robust heat-resistant skeleton, ensuring that the diaphragm experiences almost no thermal shrinkage at temperatures above 180°C, effectively preventing thermal runaway.

This invention provides a filter membrane and its preparation method. The preparation method includes the following steps: placing a porous filter membrane substrate in an environment containing plasma and a precursor, and performing plasma treatment to obtain the filter membrane; wherein the precursor includes at least one selected from hexamethyldisiloxane, perfluorooctyltriethoxysilane, pentane, ethylene, toluene, perfluorohexane, styrene, divinylbenzene, hexamethyldisiloxane, tetramethylsilane, tetraethoxysilane, tetrafluoroethylene, and hexafluoropropylene. The filter membrane obtained by this preparation method can significantly reduce the swelling rate and simultaneously increase the permeation flux in organic solvents, achieving precise molecular weight cutoff.

The application belongs to the technical field of energy conversion and storage devices, and discloses a full-solid-state light energy storage integrated device and a preparation method thereof. The full-solid-state light energy storage integrated device comprises, from bottom to top, an energy storage electrode, an energy storage gel electrolyte, a compatible electrode, a photoelectric conversion gel electrolyte and a photoanode; the energy storage electrode, the energy storage gel electrolyte and the compatible electrode constitute a supercapacitor module; the compatible electrode, the photoelectric conversion gel electrolyte and the photoanode constitute a dye-sensitized solar cell module; components of the photoelectric conversion gel electrolyte include polyvinylidene fluoride-hexafluoropropylene and 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid; components of the energy storage gel electrolyte include polyvinylidene fluoride-hexafluoropropylene, 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid and tetrabutylammonium tetrafluoroborate. The application adopts double gel electrolytes to replace liquid electrolytes, and has good energy conversion efficiency and cycle stability.

The application relates to the technical field of electrochemical energy storage, and discloses a low-negative-pressure sodium battery which comprises a negative electrode material, a positive electrode material, an electrolyte and a diaphragm, wherein the negative electrode material is hard carbon particles which are pre-lithiated and have a particle size of 5-10 mu m and are coated with a polyvinylidene fluoride-hexafluoropropylene functional layer; and a preparation method of the low-negative-pressure sodium battery is also disclosed, and the method comprises the following steps: S1, negative electrode material preparation: hard carbon particles and lithium metal sheets are mixed at a mass ratio of 1:0.4-0.6, and are heat-treated at 400-450 DEG C for 2-3 h. By adopting the pre-lithiated hard carbon negative electrode material, the stability of the battery under high-rate and long-cycle conditions is remarkably improved; by adopting the core-shell structure positive electrode material design, the structural stability and capacity retention rate of the battery in a high-temperature environment are enhanced; and by optimizing the electrolyte formula, the ion conductivity and decomposition resistance of the battery are improved.

This invention relates to the field of battery interface modifier technology, specifically a lead-free tin-based perovskite solar cell interface modifier; it comprises maleic anhydride-modified polyvinylidene fluoride-hexafluoropropylene copolymer, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-butyl-3-methylimidazolium tetrafluoroborate, and aminated graphene oxide; the modifier combines the modified copolymer with a dual ionic liquid to construct a protective layer that combines ionic conductivity and hydrophobicity with antioxidant properties; its core is to utilize the modified copolymer to improve the chemical compatibility with the perovskite absorber layer, and to compound two ionic liquids to provide efficient transport channels and enhance hydrophobicity respectively; this invention overcomes the defects of poor compatibility of traditional polymers and low protection efficiency of single materials, and achieves the best balance between ionic conductivity and interfacial hydrophobicity through multi-component synergy, effectively improving the overall protection performance.

Disclosed is a method for producing hexafluoropropene, with which a product containing hexafluoropropene is obtained by bringing a compound (A) represented by formula (A) into contact with at least one compound (B) that is selected from the group consisting of octafluorocyclobutane, pentafluoroethane, octafluoro-1-butene, and octafluoro-2-butene, and subsequently heating the resultant mixture at a reaction temperature of 780°C or higher in a reactor. In formula (A), X is a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom.　(A): CHF2-X

The present application relates to the technical field of energy storage battery pole piece bonding, and discloses a preparation method of a modified polymer composition for high-compaction energy storage battery pole piece bonding, comprising: dissolving a vinylidene fluoride-hexafluoropropylene copolymer to prepare a basic glue solution; adding an acrylate mixed monomer and an initiator to the basic glue solution for in-situ grafting; monitoring the viscosity and monomer conversion rate of the system, and uniformly dropping a phosphate ester monomer containing a flexible spacer when the monomer conversion rate reaches a threshold value, so that the polar group is bonded to the active branched chain end and a surfactant is added; the present application implants a polar anchoring point into the flexible branched chain end through kinetic control, and utilizes the component polarity difference to drive the migration of the polar group to the substrate interface during the film forming process; on this basis, the methylene chain segment conformation transformation is combined to dissipate the interfacial shear stress and inhibit the brittle drop of the peeling strength under the high-compaction working condition.

The application provides a secondary battery and an electronic device. The secondary battery comprises an electrode assembly, the electrode assembly is in a winding structure, the electrode assembly comprises a positive electrode sheet, a negative electrode sheet, a first separator and a second separator, the negative electrode sheet is located between the first separator and the second separator, the first separator comprises a first base film and a first adhesive layer, the second separator comprises a second base film and a second adhesive layer, the first adhesive layer comprises a first adhesive, and the second adhesive layer comprises a second adhesive. The first base film is a non-woven fabric film, the first adhesive comprises at least one of polyvinylidene fluoride or polyvinylidene fluoride-hexafluoropropylene copolymer. The second base film is a microporous film, and the second adhesive comprises at least one of polyimide, polyvinyl alcohol or sodium carboxymethyl cellulose. Through the above arrangement, the adhesion between the separator and the positive electrode sheet and the adhesion between the separator and the negative electrode sheet can be improved, the cycle performance and high-temperature hot box performance of the secondary battery are improved, and the secondary battery also has a high energy density.

An electrolytic composition is provided comprising one or two or more polymers, oxide particles, at least one electrolytic salt selected from the group consisting of a lithium salt, a sodium salt, a calcium salt, and a magnesium salt, and a solvent, wherein the structural units constituting the polymers comprise a first structural unit selected from the group consisting of tetrafluoroethylene and vinylidene fluoride, and a second structural unit selected from the group consisting of hexafluoropropylene, acrylic acid, maleic acid, ethyl methacrylate, and methyl methacrylate, the polymer content being more than 90% by mass based on the total amount of polymers in the electrolytic composition, and a mass ratio of the content of the first structural unit to the content of the second structural unit in the polymers being 50 / 50 or more.