199 results about "Fluoroelastomer" patented technology

A fluoroelastomer production method including a step in which monomers A comprising a compound represented by CX1X2=CX3-L-Z, a cyano-group-containing monomer, and at least one compound selected from the group consisting of tetrafluoroethylene, fluorine-containing vinyl ethers, and fluorine-containing allyl ethers are polymerized in an aqueous medium under conditions that substantially no fluorine-atom-containing emulsifier is present.

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 an oil-resistant and corrosion-resistant cable sheath material for a robot as well as a preparation method and application thereof. The oil-resistant and corrosion-resistant cable sheath material is particularly suitable for harsh environments such as underwater robots. According to the cable material, ultra-high molecular weight polypropylene, nitrile rubber, a fluorine-containing elastomer, a compatilizer, a filler and the like are used as main raw materials, and the ratio and performance of all the components are optimized, so that the oil resistance, acid and alkali corrosion resistance, salt penetration resistance and wear resistance of the cable material are remarkably improved, and meanwhile, the mechanical properties such as high tensile strength and elongation at break are maintained. According to the invention, the EPDM-g-MAH, the EPDM-g-MMA or the EPDM-g-GMA is selected as the compatilizer, so that the problem of compatibility between the polypropylene and the nitrile rubber is effectively solved. In addition, montmorillonite and talcum powder in a specific particle size range are adopted as a filler combination, so that the performance of the cable material is further optimized. The cable sheath material has remarkable advantages in the aspects of oil resistance, corrosion resistance, salt resistance and the like, the stability of the cable sheath material in severe environments is improved, and the cable sheath material is suitable for harsh environments such as underwater robots.

The invention provides a metal plate frame and fluororubber sealing assembly and a preparation method thereof, and the preparation method is applied to the technical field of semiconductor sealing and comprises the steps that S1, a metal plate frame is coated with an adhesive, dried and then cooled, and the adhesive is a trithiocyanuric acid derivative solution; s2, a cross-linking agent and an addition agent are added in the thin-passing mixing process of the perfluoroether elastomer, a mixed rubber compound is obtained, the addition agent comprises fluorinated silicon dioxide, fluorinated titanium dioxide or PFA micro powder, and the mass of the addition agent is 2-10% of the mass of the perfluoroether elastomer; and S3, the mixed rubber sheet is placed in a metal plate frame, the metal plate frame with the mixed rubber sheet is placed in a mold to be subjected to hot pressing vulcanization forming, then secondary vulcanization is conducted, then radiation vulcanization is conducted, and the assembly is obtained. The assembly prepared through the method is resistant to plasma etching and high in cleanliness, the bonding performance of the perfluoroether rubber and the metal plate frame is good, and the rate of finished products is high.

The invention discloses a flame-retardant cable and a preparation method thereof. The cable comprises conductor wire cores, a fireproof layer, an insulating layer, a shielding layer, a filling layer and a sheath layer from inside to outside. According to the cable sheath layer, 100 parts of high density polyethylene (HDPE), 5-15 parts of ethylene-vinyl acetate rubber and 3-10 parts of fluororubber are used as main materials, triallyl isocyanurate and bisphenol A diallyl ether are introduced for synergistic crosslinking, and nano montmorillonite is used as an auxiliary material, so that a compact interpenetrating network is constructed. The tensile strength of the sheath layer composite material is greater than or equal to 26.5 MPa, the elongation at break is greater than or equal to 387%, the performance retention rate is greater than 92% after the sheath layer composite material is soaked in slurry for 28 days, the limit oxygen index is greater than 38%, the water vapor transmission coefficient is less than or equal to 1.5 * 10 <-4 > g.mm / (m < 2 >. D.Pa), and the sheath layer composite material has excellent flame retardance, barrier property and slurry resistance and is suitable for harsh outdoor environments such as rail transit.

The invention discloses a high-temperature-resistant nylon composite material and a production process thereof, and belongs to the technical field of nylon composite material preparation. The high-temperature-resistant nylon composite material is prepared from the following components in parts by weight: 35-48 parts of nylon resin, 7-12 parts of a heat-resistant agent, 3-8 parts of a modified anticorrosive agent, 1-3 parts of calcium stearate, 1-3 parts of a flame retardant and 2-10 parts of glass fibers, and the heat-resistant agent is prepared from 2, 4-dinitrophenol, hydrazine hydrate, p-nitrobenzoic acid, triethylamine, polyphosphoric acid and 2, 4-dinitrophenol. The nylon composite material is prepared from 2, 2 '-bis (3, 4-dicarboxylic acid) hexafluoropropane dianhydride, and the modified anticorrosive agent is prepared from fluororubber, benzyltriethylammonium chloride, lithium aluminum hydride and isophorone diisocyanate. The nylon composite material prepared by the method has excellent high temperature resistance and corrosion resistance.

The invention discloses carbon nanotube modified conductive fluororubber and a preparation method thereof, and belongs to the technical field of conductive rubbers, the carbon nanotube modified conductive fluororubber comprises the following raw materials: fluororubber, carbon nanotubes, metal oxide powder, carbon black, a silane coupling agent, an anti-aging agent, a plasticizer, stearic acid, a vulcanizing agent and an accelerant. The preparation method comprises the following steps: cutting the fluororubber into blocks, removing impurities, uniformly mixing with the plasticizer, the anti-aging agent and the accelerant, then feeding together with the remaining raw materials, and carrying out mixing, plastication, vulcanization, cutting and molding to obtain the carbon nanotube modified conductive fluororubber. The fluororubber is modified by using the carbon nanotubes, so that the conductivity is improved, and the problem of insufficient conductivity in the prior art can be solved. Meanwhile, the method can maintain the excellent mechanical performance of the conductive fluororubber, and the practicability and reliability of the conductive fluororubber are further enhanced.

The present invention relates to a method for manufacturing fluoroelastomers having iodinated / brominated chain ends, in emulsion polymerization whereas no addition of fluorosurfactants or hydrogenated surfactants is required. The resulting elastomer provides for cured articles having improved c-set and low polydispersity.

The invention discloses a firework propellant containing a fluorine binder and a preparation method of the firework propellant, and belongs to the technical field of firework propellant composite materials. The preparation method comprises the following steps: dissolving Fe3O4, CuO and polyvinylpyrrolidone into a mixed solution; dissolving the RDX in an acetone solution, and adding the mixed solution to recrystallize and separate out the RDX to obtain a modified RDX explosive; under the protection of inert atmosphere, mixing aluminum powder, magnesium powder and boron powder to obtain active metal powder; adding polytetrafluoroethylene powder, modified RDX explosive and active metal powder to obtain premixed composite powder; and adding a binder fluororubber and polyvinylidene fluoride into ethyl acetate, mixing, adding the premixed composite powder, mixing, and granulating. According to the fluorine-containing binder, the burning speed of a firework propellant system can be controlled, the fluorine-containing binder has good compatibility with an energetic material system, and the product has the advantages of being free of sulfur and nitrogen, slight in smoke, resistant to high temperature, high in safety and the like.

The invention provides a fluororubber recovery system of an open mill and a fluororubber recovery method, and belongs to the field of fluoroelastomer processing, the fluororubber recovery system specifically comprises an open mill and a roller built-in cooler, to-be-recovered fluororubber is cooled and preliminarily crushed; the constant temperature system is used for controlling the refrigerant temperature and the refrigerant flow rate of the cooler; the low-temperature freezing and crushing system is used for performing low-temperature freezing and crushing on the primarily crushed fluororubber to obtain fluororubber particles; the screening system is used for screening the crushed fluororubber particles conforming to the preset size; the washing system is used for washing the additive powder released by removing the fluororubber particles in the freezing and crushing process; and the high-gradient magnetic field separator is used for removing ferromagnetic particles generated in the freezing and crushing process from the cleaned fluororubber particles by adopting a high-gradient magnetic field so as to obtain recycled fluororubber particles. By means of the treatment scheme, the fluororubber particles are efficiently recycled, and the performance of rubber products is not affected.

Provided is a fluoroelastomer composition comprising a fluoroelastomer (a), a cross-linking agent (b), and an organic acid (c), wherein the organic acid (c) is at least one selected from the group consisting of an organic acid having 3 to 10 carbon atoms and having one acid group in a molecule, and an organic acid having 2 to 10 carbon atoms and having two or more acid groups in a molecule.

Provided is a composition containing: a polymer (I) having a polymerization unit (I) based on a monomer (I) represented by general formula (I); and a fluoroelastomer, wherein a content of the polymer (I) is 0.0001 to 1.0% by mass based on the fluoroelastomer:         CX1X3=CX2R(-CZ1Z2-A0)m     (I) wherein X1 and X3 are each independently F, Cl, H, or CF3; X2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A0 is an anionic group; R is a linking group; Z1 and Z2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.

The invention discloses an acid-alkali resistant fluororubber and a preparation method and application thereof, belonging to the technical field of fluororubber. The method comprises the following raw materials by mass: 100-120 parts of fluororubber, 10-20 parts of tetrapropylene fluororubber, 4-6 parts of benzoyl peroxide and 20-25 parts of modified composite filler. After mixing the fluororubber and tetrapropylene fluororubber on an open mill, the modified composite filler is added for mixing, and then the benzoyl peroxide is added for mixing to obtain a mixed rubber. The mixed rubber is sheeted and vulcanized to obtain the acid-alkali resistant fluororubber. The acid-alkali resistant fluororubber prepared by the invention is vulcanized by peroxide, and the alkaline modified composite filler is uniformly dispersed in the fluororubber, thereby improving the physical properties and mechanical properties of the fluororubber. The alkaline modified composite filler not only reduces the aging effect on the fluororubber during the vulcanization process, but also improves the acid resistance of the fluororubber after vulcanization, and can be well applied in the field of sealing rubber for electric vehicle batteries.

Provided is a crosslinkable composition including a fluoroelastomer and a solid solution of aluminum oxide and magnesium oxide.

A cleaning device for processing regenerated fluororubber belongs to the technical field of cleaning, and aims to solve the problem that some dirt in a fluororubber reclaimed material cannot be completely removed, the cleaning device comprises a cleaning barrel and a mounting barrel mounted in the cleaning barrel in a penetrating manner, and a drain pipe is fixedly mounted on the side wall of the cleaning barrel; under the cooperation of a pushing block, a trapezoidal block, a first spring, a first mounting groove and a handle, the situation that when a material frame rotates, a material door is opened through powerful rotation, and fluororubber is scattered can be avoided, under the cooperation of a mounting barrel, a cleaning barrel, a screw and a nut, the mounting barrel and the cleaning barrel are fixed well, and the cleaning effect is improved. According to the fluororubber cleaning device, the fluororubber is extruded and rubbed while being swung under the cooperation of the motor, the second telescopic air cylinder, the rotating shaft, the U-shaped rod, the material frame and the rolling disc, the cleaning efficiency of the fluororubber can be improved, the fluororubber is spin-dried under the cooperation of the second telescopic air cylinder, the motor and the rolling disc, and the cleaning speed is further improved.

The invention discloses a device and a method for producing peroxide vulcanized fluororubber, belongs to the technical field of production of peroxide vulcanized fluororubber, and aims to solve the problem that a material adsorbed on the inner wall of an internal mixing box cannot be internally mixed, so that the mix proportion is unbalanced. A production device of peroxide vulcanized fluororubber comprises a workbench, a supporting rod and a heating box, the supporting rod and the heating box are fixedly installed on the workbench, and under cooperation of a second telescopic air cylinder, a baffle, a protection cover, a conveying opening and an internal mixing box, the whole internal mixing box is in a closed state; under the cooperation of a driving motor, a first rotating shaft, a second rotating shaft, a gear, a rotor and a heating box, materials are internally mixed, under the cooperation of a controller, an electromagnet, a magnet, a vibrating plate, a first sliding groove and a first spring, a large amount of materials adsorbed on the vibrating plate are bounced to the rotor, and the situation that the powdery materials are reduced, and consequently the mixing ratio is unbalanced is avoided; therefore, the quality of the mixed fluororubber cannot reach the factory standard, and the waste of materials is indirectly avoided.

The invention belongs to the technical field of sports equipment, and particularly relates to a modified polyethylene anaerobic biodegradable material as well as a preparation method and application thereof. Comprising the following components in parts by weight: 70-100 parts of polyethylene, 0-5 parts of probiotic anaerobic degradable plastic master batch, 0-5 parts of anaerobic enzyme accelerant, 5-15 parts of ethylene-vinyl acetate copolymer, 1-15 parts of corn starch, 0.1-5 parts of compatibilizer, 0.01-0.06 part of fluoroelastomer, 2-8 parts of coupling agent and 1-5 parts of dispersing agent. According to the invention, polyethylene is used as a matrix, and through directional modification of a degradation trigger and synergistic enhancement of a trace of functional aids, the controllable anaerobic biodegradation capability is given to polyethylene for the first time on the premise of retaining excellent processability and mechanical properties of polyethylene, and the long-standing technical bottleneck that performance and environmental protection cannot be achieved at the same time in the field of sports equipment is broken through; and an industrialization feasible path is provided for green upgrading of sports equipment.

An apparatus for use in applying TTFields includes an electrode subassembly. The electrode subassembly includes at least one electrode element having a skin-facing side and a skin-facing surface and a dielectric layer on the skin-facing side of the at least one electrode element. The dielectric layer includes at least one fluoroelastomer. The electrode subassembly includes a skin-facing surface and the dielectric layer provides the skin-facing surface of the electrode subassembly. A skin contact subassembly is coupled to the electrode subassembly. The skin contact subassembly includes a skin contact conductive adhesive or gel configured to contact skin of a subject. The skin contact conductive adhesive or gel is electrically coupled to the at least one electrode element when the skin contact subassembly is disposed against the skin-facing surface of the electrode subassembly. The skin contact subassembly is releasably coupled to the electrode subassembly.

The present disclosure provides a conductive diaphragm and a speaker using same. The conductive diaphragm includes a main portion made of polymer material and a conductive portion located on the main portion. The conductive portion includes a substrate with a film layer and conductive material dispersed in the substrate, the film layer is solidified from at least one material of thermoplastic elastomer, phenyl silicone, isoprene rubber, or fluoroelastomer. Compared with the related technologies, the conductive diaphragm disclosed by the present disclosure has excellent atigue-resistant property and could maintain good adhesive strength and toughness.

Anti-slip components are made from a polymeric composition that comprises a fluoroelastomer doped with a transition metal ceramic. The fluoroelastomer has excellent chemical resistance and thermal resistance, and the transition metal ceramic increases the static coefficient of friction for the polymeric composition. The anti-slip components are especially suitable for material handling systems that may be exposed to harsh environments in a photolithographic patterning system.

The present invention relates to a solid composite electrolyte comprising a) at least one fluoroelastomer and b) at least one sulfide-based solid ionic conducting inorganic particles that differs from a lithium salt, wherein a) the fluoroelastomer comprises recurring units derived from i) vinylidene difluorides and ii) from 15.0 to 80.0 mol % of at least one C2-C8 chloro and / or bromo and / or iodo fluoroolefin, the mol % being relative to the total moles of recurring units, wherein the solid composite electrolyte does not contain a lithium salt; to a slurry for manufacturing a solid composite electrolyte comprising a) a fluoroelastomer and b) a sulfide-based solid ionic conducting inorganic particle that differs from a lithium salt, and c) at least one non-aqueous solvent, wherein the slurry does not contain a lithium salt; and to a solid-state battery comprising a positive electrode, a negative electrode and a membrane, at least one among which comprises a solid composite electrolyte according to the present invention. The present invention also relates to a binder solution for a solid-state battery comprising a) at least one fluoroelastomer and c) at least one non-aqueous solvent.

The present invention relates to a novel fluoroelastomer and to a curable composition comprising the fluoroelastomer and at least one curing agent. The present invention also relates to a method for manufacturing a shaped article comprising curing the curable composition and to cured articles obtainable from the composition.

Provided is a method for producing an aqueous dispersion of a fluorine-containing elastomer by polymerizing a fluorine-containing monomer in the presence of an aqueous medium and a polymerization initiator to produce an aqueous dispersion containing the fluorine-containing elastomer, wherein the amount of generated radicals is adjusted.

Provided is a method for producing a fluorine-containing elastomer aqueous dispersion, which polymerizes a fluorine-containing monomer in the presence of a compound (1) having an aromatic ring, a hydrophilic group, and an unsaturated double bond, and an aqueous medium, thereby producing an aqueous dispersion of a fluorine-containing elastomer having -CH2- in the main chain.

A crosslinkable elastomer composition including a crosslinkable elastomer and a surface-oxidized non-oxide ceramic. Also disclosed is a fluoroelastomer molded article having a weight reduction percentage of 2.5% by mass or less and an amount of particles generated of 0.05% by mass or less after O2 plasma irradiation, a weight reduction percentage of 1.8% by mass or less, an amount of particles generated of 0.05% by mass or less after NF3 plasma irradiation, and a compression set of 50% or less after aging at 300° C. for 70 hours.

The invention relates to a curable fluoroelastomer composition having low swelling tendency, comprising: A) a curable fluoroelastomer; B) a curing system; and C) 0.1 wt.-% to 30 wt.-% of a nitrogen-containing polymer, selected from polyimide, polyimide, mixtures and / or copolymers thereof, each relative to the total weight of fluoroelastomer and nitrogen-containing polymer, the nitrogen-containing polymer being present in particulate form of an average particle size in the range of 0.15 to 70 μm and / or in fiber form having an average fiber diameter in the range of 0.15 to 70 μm.

An air management system component containing a crosslinked fluoroelastomer layer obtained by crosslinking a fluoroelastomer composition that contains a peroxide-crosslinkable fluoroelastomer and a hydrotalcite compound. Also disclosed is the fluoroelastomer composition.

The present invention provides a uniquely designed crosslinking system for fluoroelastomers, which a bisphenol free, safe crosslinking system for fluoroelastomers comprising the components: a) a phase transfer catalyst selected from quaternary ammonium or phosphonium salt; b) a non-bisphenol curative agent; c) a dispersing agent; d) a processing aid; and e) at least one additive. Said uniquely designed crosslinking system shall be useful in making commercially available fluoroelastomers / fluoropolymers exhibiting high thermal, chemical, ageing and weather resistance, excellent inertness to solvents, hydrocarbons, acids and alkalis, low dielectric constants, low flammability, low refractive index, low surface energy and low moisture absorption.

Fluoroelastomer compounds containing a particular type of carbon black are disclosed, along with cured articles formed from these compounds. These compounds show numerous characteristics useful for cured fluoroelastomer articles.

A curable fluoroelastomer composition comprises a curable fluoroelastomer, a dehydrohalogenating agent, an acid acceptor comprising bismuth oxide present in the curable fluoroelastomer composition in an amount of at least 3 parts per hundred parts by weight of the curable fluoroelastomer, and at least one silicon-containing chemical present in the curable fluoroelastomer composition in an amount of at least 0.2 parts per hundred parts by weight of the curable fluoroelastomer. A cured fluoroelastomer cured from the curable fluoroelastomer composition has a static coefficient of friction and a dynamic coefficient of friction of less than 1.