115 results about "Perfluoroether" patented technology

The invention provides passivated perfluoroether elastomer rubber as well as a preparation method and application thereof. The passivated perfluoroether elastomer rubber is prepared by sputtering an yttrium oxide passivation layer on the surface of perfluoroether elastomer rubber. The preparation method comprises the following steps: placing the perfluoroether elastomer rubber in a vacuum sputtering cavity, and carrying out sputtering treatment by adopting an yttrium target material to form an yttrium oxide passivation layer with the thickness of 10-100 nm so as to obtain passivated perfluoroether elastomer rubber; and carrying out annealing treatment on the passivated perfluoroether elastomer rubber to eliminate surface stress, and then cleaning and drying for later use. The passivated perfluoroether elastomer rubber is applied to the etching process in the semiconductor manufacturing process, the plasma etching resistance of a perfluoroether elastomer rubber product can be effectively improved by sputtering the yttrium oxide passivation layer, and meanwhile the lubricating performance of the perfluoroether elastomer rubber product is improved.

The invention relates to the technical field of perfluoroether rubber, in particular to a perfluoroether rubber composite material and a preparation method thereof. The perfluoroether rubber composite material provided by the invention comprises modified perfluoroether rubber and a matrix material, a method for obtaining the modified perfluoroether rubber comprises the step of sequentially carrying out plasma activation and surface modification treatment on the perfluoroether rubber, and the surface modification method comprises at least one of coupling agent modification and nanofiller coating. The perfluoroether rubber is treated to obtain the modified perfluoroether rubber, so that the interface energy of the perfluoroether rubber is reduced, and the compatibility of the perfluoroether rubber and a matrix material is effectively improved; uniform nanoscale coarse structures and active sites are formed on the surface of the perfluoroether rubber through plasma activation, and the activated perfluoroether rubber is subjected to surface modification through coupling agent surface modification or nano filler coating, so that the processing stability and the mechanical property of the perfluoroether rubber composite material are improved.

The invention provides a method for decomposing and mineralizing fluorine-containing organic matter wastewater, which is applied to the technical field of treatment of fluorine-containing organic matter wastewater generated in a perfluoroether elastomer emulsion flocculation process, and comprises the following steps: S1, carrying out adsorption and desorption treatment on the fluorine-containing organic matter wastewater to obtain a concentrated solution of the fluorine-containing organic matter wastewater; s2, hydrogen peroxide and ferrous ions are added into a container containing the concentrated solution to obtain a mixed solution, the pH of the mixed solution is adjusted to be 2-4, the concentration mass ratio of the hydrogen peroxide to organic matter contained in the fluorine-containing organic matter wastewater is 1: 1-2, the molar ratio of the hydrogen peroxide to the ferrous ions is 1-6: 1, micro-nano bubbles are introduced into the mixed solution, and ultrasonic treatment is conducted; s3, calcium hydroxide is added into the treated mixed solution, calcium fluoride precipitates are obtained through centrifugal treatment, and the fluorine-containing organic matter in the wastewater can be degraded and mineralized.

The invention discloses perfluoroether rubber as well as a preparation method and application thereof. The perfluoroether rubber has an A1-B1-A2-B2 block structure, and the block A1, the block B1, the block A2 and the block B2 are respectively and independently obtained by polymerizing tetrafluoroethylene and perfluoroalkyl vinyl ether; the molar percentage content of the perfluoroalkyl vinyl ether in the block B1 or the block B2 is higher than the molar percentage content of the perfluoroalkyl vinyl ether in the block A1 and is also higher than the molar percentage content of the perfluoroalkyl vinyl ether in the block A2; the molar percentage content of the perfluoroalkyl vinyl ether in the block B2 is higher than the molar percentage content of the perfluoroalkyl vinyl ether in the block B1. The perfluoroether rubber provided by the invention has an A1-B1-A2-B2 four-block structure, realizes progressive transition of rigidity-flexibility-rigidity-super-flexibility, reduces compression set, prolongs the service life of a plasma environment, has high thermal decomposition temperature, and can be used for a long time at 300 DEG C or above.

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 high-purity plasma-corrosion-resistant perfluoroether rubber material which comprises the following components in parts by mass: 100 parts of perfluoroether rubber; 10-20 parts of an organic polymer filler; 0.5-3 parts of a vulcanizing agent; and 1-4 parts of an assistant vulcanizing agent. The invention also provides a preparation method of the rubber material. The preparation method comprises the following steps: preparing a perfluoroether rubber compound and thermally vulcanizing the perfluoroether rubber. The prepared high-purity perfluoroether rubber material is excellent in high-temperature resistance, good in plasma etching resistance and extremely low in metal ion precipitation amount, and has important guiding significance on development of sealing materials.

The invention discloses a high-temperature-resistant perfluoroether elastomer composition and a preparation method thereof. The preparation method of the high-temperature-resistant perfluoroether elastomer composition comprises the following steps: S1, carrying out emulsion polymerization on tetrafluoroethylene, perfluoromethyl vinyl ether, a non-conjugated fluorine diene vulcanization point monomer, a phenyl-containing perfluorodiene vulcanization point monomer and a peroxide initiator according to a preset proportion to obtain a perfluoroether elastomer emulsion; s2, condensing, washing and drying the perfluoroether elastomer emulsion to obtain perfluoroether elastomer micro powder; s3, mixing and thin-passing the perfluoroether elastomer micro powder with a filler, an acid acceptor and a vulcanizing agent in a preset proportion to obtain perfluoroether elastomer mixed rubber; and S4, carrying out compression molding on the perfluoroether elastomer rubber compound, and carrying out secondary vulcanization to obtain the perfluoroether elastomer composition with high temperature resistance and water vapor resistance. The perfluoroether elastomer composition prepared by the invention has the characteristics of high temperature resistance, water vapor resistance and low compression set.

The invention discloses a functionally gradient perfluoroether rubber material as well as a preparation method and application thereof. The functional gradient perfluoroether rubber material comprises a contact layer, a transition layer and a supporting layer which are tightly connected in sequence, wherein the contact layer is prepared from raw materials including raw perfluoroether rubber, a filling agent, a vulcanizing agent and a plasticizer; the transition layer is prepared from raw materials including raw perfluoroether rubber, a filling agent and a vulcanizing agent; the supporting layer is prepared from raw materials including raw perfluoroether rubber, a filling agent and a vulcanizing agent; the Shore A hardness of the contact layer is smaller than or equal to the Shore A hardness of the transition layer and smaller than or equal to the Shore A hardness of the supporting layer. Through component gradient design and process regulation and control, continuous gradient distribution of mechanical properties such as hardness and viscoelasticity of the material in space is realized, so that the problem of contradiction between the sealing performance of the elastic membrane of the medical micro-flow electromagnetic valve and the pipetting precision is solved.

The invention relates to the technical field of semiconductor processing, and discloses an energy-saving double-furnace-body vacuum sintering furnace for a quartz waste liquid bottle for a semiconductor, which comprises a nested structure of a heat preservation drying furnace and a high-temperature sintering furnace, a rotary drying frame is arranged between the heat preservation drying furnace and the high-temperature sintering furnace, and the opening and closing of furnace doors are controlled through a guide rail driving mechanism respectively; the high-temperature sintering furnace adopts a molybdenum alloy lining; the vacuum pump combination realizes high vacuum, the furnace door adopts perfluoroether rubber triple sealing, the rotary drying frame and the sintering frame are respectively provided with a quartz boat and a lead screw guide rail driving mechanism to guarantee high-precision positioning, and during working, the two furnace bodies operate cooperatively, waste liquid bottles are dried and preheated in the heat preservation drying furnace firstly and then transferred to the high-temperature sintering furnace to be sintered. The vacuum interlayer is used for heat insulation, so that energy consumption is reduced, impurity volatilization rate is increased, and efficient and energy-saving recovery of the quartz waste liquid bottle is effectively realized.

The utility model discloses an optical path adjustable flow cell which comprises a flow cell cavity, two adjusting seats are oppositely arranged in the flow cell cavity, the two adjusting seats are both in threaded connection with the flow cell cavity, lenses are arranged at the opposite ends of the two adjusting seats, compression screws are arranged on the opposite sides, facing the flow cell cavity, of the lenses, and the compression screws are in threaded connection with the flow cell cavity. A connector is arranged at the tail end of the adjusting seat; the optical path adjusting device is simple in structure and reasonable in design, rotary fine adjustment of the optical path is achieved through threaded connection of the adjusting base and the flow cell cavity, the optical path can be adjusted without disassembling and assembling the flow cell, and convenience of experimental operation is improved. The lens and the cavity are directly matched and installed, the parallelism of the lens is ensured, and the detection precision is improved. In addition, a perfluoroether O-shaped sealing ring is adopted, so that the sealing performance is better, the corrosion resistance and the pressure resistance are stronger, and the stability and the reliability of equipment in a complex environment are ensured.

The utility model belongs to the technical field of rubber synthesis processing, and particularly relates to a low-temperature-resistant perfluoroether rubber synthesis device which comprises a reaction kettle main body and a stirring motor, the stirring motor is fixedly mounted at the top of the reaction kettle main body, and a stirring mechanism is arranged in the reaction kettle main body; the stirring mechanism comprises a sleeve, an annular groove, a rotating rod, a sliding column, a convex block, a stirring rod and stirring blades, the sleeve is fixedly connected to the top of the inner wall of the reaction kettle main body, the annular groove is formed in the inner wall of the sleeve, one end of the rotating rod is fixedly connected to the output end of the bottom of the stirring motor, and the other end of the rotating rod penetrates through the interior of the sleeve; the surface of the rotating rod is sleeved with the sliding column. The utility model provides a low-temperature-resistant perfluoroether rubber synthesis device, which can increase the fluidity of raw materials during stirring by moving the stirring rod up and down, ensure that all the raw materials can be effectively stirred, enable the raw materials to be uniformly heated and improve the synthesis rate of the raw materials.

The invention discloses a triazine perfluoroether rubber secondary vulcanization atmosphere control method and a product thereof, the triazine perfluoroether rubber secondary vulcanization atmosphere control method comprises the following steps: S1, triazine perfluoroether rubber subjected to primary vulcanization is subjected to secondary vulcanization in an inert gas atmosphere, the moisture content in the inert gas atmosphere is less than 20 ppmv, and the product is subjected to secondary vulcanization; the vulcanization temperature is 275 to 295 DEG C; and S2, replacement air is introduced, passivation is conducted in the air atmosphere, then the triazine perfluoroether rubber product is obtained, and the passivation temperature ranges from 275 DEG C to 295 DEG C. The method solves the problem of unstable product performance caused by improper atmosphere control in the secondary vulcanization process of the triazine perfluoroether rubber, the compression deformation rate of the perfluoroether rubber product prepared by the method is less than or equal to 10%, and the perfluoroether rubber product can be used in the high-end sealing fields of semiconductors, aerospace and the like.

The invention relates to the technical field of fluororubber foaming compositions, in particular to an environment-friendly fluororubber foaming composition for a heater and a preparation method and application of the environment-friendly fluororubber foaming composition. The environment-friendly fluororubber foaming composition for the heater is prepared from the following raw materials: perfluoroether rubber, an amidine salt compound and metal hydroxide, the obtained environment-friendly fluororubber foaming composition for the heater can be vulcanized and can also be foamed in the heating process, foaming and vulcanization are carried out at the same time, a new cross-linking agent does not need to be added, and the environment-friendly fluororubber foaming composition for the heater is environment-friendly and energy-saving. And the foaming gas generated by foaming is H2O, so that the fluororubber foaming composition is environment-friendly and belongs to the environment-friendly fluororubber foaming composition for the heater.

The invention provides a temperature-resistant anti-corrosion rubber composition for sealing an electrolytic bath, which comprises the following components in parts by weight: 20-40 parts of fluororubber, 50-80 parts of perfluoroether rubber, 7-15 parts of carbon black, 3-7 parts of sulfur, 3-8 parts of plasticizer, 4-6 parts of reinforcing fiber, 10-15 parts of reinforcing supplement, 3-10 parts of anti-aging agent, 1-7 parts of scorch retarder, 1-4 parts of anti-reversion agent and 1-4 parts of accelerant. According to the temperature-resistant and corrosion-resistant rubber composition for sealing the electrolytic cell, disclosed by the invention, the fluororubber and the perfluoroether rubber are mixed, and the carbon black and the sulfur are added for mixing, so that the corrosion resistance of the rubber is greatly enhanced, the temperature resistance is improved, and reinforcing fibers and a nano reinforcing supplement are added in the mixing process; a framework-node-rubber structure is formed in rubber after full mixing at a certain temperature, the strength of the rubber in the using process can be greatly enhanced through microscopic modification, meanwhile, the temperature resistance and corrosion resistance of the rubber are further improved, and the sealing problem in the using process of an electrolytic cell is solved.

The invention discloses an adhesive and a preparation method thereof, the adhesive is used for bonding perfluoroether rubber and metal, and the adhesive is prepared from the following raw materials in parts by weight based on 100 parts of the adhesive: 80-98 parts of absolute ethyl alcohol; 0.2 to 5 parts by weight of a borane ammonia complex; 1 to 10 parts by weight of vinyl silane; and 1-5 parts by weight of silica sol. The adhesive provided by the invention is a combination of a borane ammonia complex, vinyl silane, nano silicon dioxide sol and absolute ethyl alcohol in specific parts; by selecting the combination of the borane ammonia complex, the silane coupling agent KH570 and the nano silicon dioxide sol to replace the existing common perfluoroether rubber / metal adhesive, the perfluoroether rubber / metal adhesive has excellent peel strength and high temperature resistance, and can be used for manufacturing door plates and racket products of semiconductor equipment.

The application discloses an extreme environment stable fatigue fracture self-adhesion ion skin and a preparation method and application thereof. The ion skin is formed by combination of chemically inert low cross-linked polydimethylsiloxane elastomer and perfluoroether rubber respectively with a stretchable ion conductive elastic fiber network through mechanical interlocking technology; wherein the polydimethylsiloxane elastomer is prepared by polymerization and curing of a silicone elastomer base and a PDMS curing agent, the perfluoroether rubber is obtained after solvent volatilization of a perfluoroether rubber solution, and the stretchable ion conductive elastic fiber network is obtained by electrospinning; the strength of the ion skin is greater than or equal to 9.9 MPa, the toughness is greater than or equal to 10 MJm ‑3 , the tensile strain is greater than or equal to 355%, the tensile toughness is greater than or equal to 5.7 MJm ‑3 , and the breaking energy is greater than or equal to 71.6 kJm ‑2 . The application of the ion skin in preparation of a flexible stretchable electronic device in an extreme environment. The application has simple process, excellent mechanical properties, extreme environment tolerance and self-adaptive surface adhesion capacity.

The application discloses a kind of high-temperature-resistant perfluoroether elastomer composition and preparation method, and the preparation method of high-temperature-resistant perfluoroether elastomer composition includes the following steps: S1, predetermined proportion of tetrafluoroethylene, perfluoromethyl vinyl ether, non-conjugated fluorine diene sulfur point monomer and phenyl-containing perfluorodiene sulfur point monomer and peroxide initiator emulsion polymerization obtain perfluoroether elastomer emulsion;S2, perfluoroether elastomer emulsion is condensed, washed, dried, and perfluoroether elastomer micro powder is obtained;S3, perfluoroether elastomer micro powder is mixed with predetermined proportion of filler, acid absorbent, vulcanizing agent and thin passage, and perfluoroether elastomer mixing rubber is obtained;S4, perfluoroether elastomer mixing rubber is molded by mould pressing, and secondary vulcanization obtains high-temperature-resistant, water-vapor-resistant perfluoroether elastomer composition.The perfluoroether elastomer composition prepared by the application has the characteristics of high-temperature resistance, water-vapor resistance and low compression permanent deformation.

The utility model relates to the field of fire hoses, in particular to a composite puncture-resistant fire hose. The technical problem to be solved by the utility model is to provide a high-strength pressure bearing, chemical erosion resistance, efficient heat insulation, long-acting wear resistance and multi-stage puncture resistance; and reliable guarantee is provided for a complex fire scene environment. A composite puncture-resistant fire hose comprises a fire hose body and connecting buckles fixedly connected to the two ends of the fire hose body. The fire hose main body comprises a chemical corrosion resistant layer which is positioned on the innermost side and is made of perfluoroether rubber; a pressure-bearing lining layer is fixedly adhered to the outer side of the chemical corrosion resistant layer; and the pressure-bearing lining layer is made of a thermoplastic polyurethane material. According to the utility model, high-strength pressure bearing, chemical erosion resistance, efficient heat insulation, long-acting wear resistance and multi-stage puncture resistance are achieved; and a reliable guarantee is provided for a complex fire scene environment.

The invention discloses a method for polymerizing a perfluoroether elastomer in supercritical carbon dioxide, the perfluoroether elastomer prepared by the method and a composition, the method comprises the following steps: adding carbon dioxide, a perfluoromethyl vinyl ether monomer and a tetrafluoroethylene monomer into a reactor, the carbon dioxide concentration in the reactor being greater than or equal to 30 mol%; and continuously adding the initiator, the chain transfer agent and the vulcanization point monomer to initiate the polymerization reaction of the perfluoroether elastomer. The reactor adopts a jacketed heat exchanger, combines spraying of a liquid tetrafluoroethylene monomer and perfluoromethyl vinyl ether and carbon dioxide reflux to supplement cold energy, utilizes latent heat of vaporization to absorb heat released by polymerization reaction, and controls the reaction temperature to be 35-125 DEG C. The perfluoroether elastomer prepared by the method has good thermal stability, and is suitable for industrial production. The preparation method has the advantages of simple process, chemical corrosion resistance and low fluorine ion extraction degree, and the temperature in the preparation process is accurately controlled, so that unstable end groups of the obtained perfluoroether elastomer are greatly reduced, and various physical properties of the elastomer are favorably improved.

The utility model relates to the technical field of cable end protective sleeves, and discloses a high-sealing insulated cable end protective sleeve, which comprises fixing rings for contraction and fixation, connecting rings are fixedly connected to the opposite ends of the fixing rings, adjusting rings are rotatably connected to the opposite ends of the connecting rings, and the adjusting rings are rotatably connected to the fixing rings. The inner wall of the adjusting ring is connected with a transmission screw rod through a gear set, the opposite ends of the fixing rings are fixedly connected with a plurality of sliding groove pipes, the outer wall of the transmission screw rod is connected with a supporting plate through a supporting set, the sheath body is used for preventing corrosion, and the outermost layer of the sheath body is provided with a perfluoroether rubber protection layer. And a ceramic silicone rubber flame-retardant layer is arranged on the inner side of the perfluoroether rubber protective layer. According to the utility model, firm fixation of the sheath body between cable ends is ensured, loosening or falling in the use process is prevented, and extreme environment tolerance, uniform stress distribution, heat management optimization and protection reliability improvement are realized.

The invention provides a corrosion-resistant fluoroether rubber polymer material, a preparation method thereof and an application of the corrosion-resistant fluoroether rubber polymer material in an airbag pump. Relates to the technical field of air bag pump component materials. The corrosion-resistant fluoroether rubber polymer material comprises 100-130 parts of a modified perfluoroether rubber polymer, 20-30 parts of a filler, 1-3 parts of a cross-linking agent, 2-5 parts of an accelerant, 3-10 parts of a functional aid and 5-10 parts of an acid acceptor, wherein the modified fluoroether rubber polymer is 6-perfluorobutyl UPy (at) POSS (Polyhedral Oligomeric Silsesquioxane) grafted PPS (Polyphenylene Sulfide) fiber reinforced perfluoroether rubber. The corrosion-resistant fluoroether rubber polymer material disclosed by the invention can be applied to a rubber part of an air bag pump, and the corrosion resistance, the mechanical strength and the wear resistance of the rubber part at high temperature are improved.

This invention belongs to the field of polymer composite materials technology, specifically relating to a self-lubricating polyimide resin based on a perfluoroether bond network and carbon dot reinforcement, its preparation method, and applications. The invention involves mixing carboxyl-functionalized carbon dots, an ether-containing aromatic diamine, and a polar aprotic solvent to obtain a carbon dot-diamine pre-assembled system, which is then polymerized with a perfluoroaromatic dianhydride to obtain a linear polyamic acid solution. This linear polyamic acid solution is then reacted with a phenylacetylene-containing active end-capping agent to obtain a polyamic acid solution with a three-dimensional network structure. Finally, the polyamic acid solution with the three-dimensional network structure is cured in a protective gas atmosphere to obtain a self-lubricating polyimide resin. The self-lubricating polyimide resin provided by this invention achieves a synergistic improvement in load-bearing capacity, wear resistance, and structural stability under high temperature and high load conditions, and can be widely applied in aerospace high-temperature bearings, high-load sealing rings, wear-resistant coatings for extreme conditions, and high-temperature sliding components.

The invention relates to the technical field, and discloses a preparation process of a perfluoroether elastomer, which comprises the perfluoroether elastomer. The perfluoroether elastomer is prepared through ternary polymerization of 1, 1-difluoroethylene (VDF), perfluoromethyl vinyl ether (PMVE) and 3-hydroxy-2-trifluoromethyl propionic acid (MAF-OH), a self-made hydroxyl-containing third monomer MAF-OH is introduced, a polar group is successfully introduced into a fluoroelastomer molecular chain, and the polarity and compatibility of a polymer are effectively improved; the prepared perfluoroether elastomer is white powder, has excellent elasticity, high temperature resistance and chemical medium resistance, and has wide application prospects in the fields of preparation of high-end sealing materials, gaskets, rubber tubes and the like.

In order to overcome the problem that solvent-resistant peroxide-vulcanized perfluoroether rubber products are difficult to be used at high temperature above 310 DEG C for a long time and have poor heat resistance, a method for preparing perfluoroether rubber by soap-free emulsion polymerization is provided, comprising the following steps: mixing deionized water, a first monomer and a pH regulator to obtain a mixed liquid; heating the mixed liquid to a reaction temperature, introducing a second monomer and a third monomer into the mixed liquid to a reaction pressure, adding an initiator into the mixed liquid to carry out a polymerization reaction, and obtaining an emulsion after the reaction, and obtaining perfluoroether rubber through post-treatment of the emulsion; the first monomer is a compound shown in formula 1, CF2=CFO(CF2)nCOOH, formula 1, wherein n is an integer of 1-4; the second monomer is tetrafluoroethylene, and the third monomer is perfluoroalkyl vinyl ether. The perfluoroether rubber prepared by the method provided in the application can be vulcanized by peroxide without using a cross-linking aid, and solvent-resistant perfluoroether rubber products with superior heat resistance are obtained.

The invention discloses an electronic liquid seal flame-retardant material and application thereof, the material comprises a fluorine-containing polymer, a rheology modifier and a functional nano-material in a mass ratio of (70-99.5): (0-20): (0-10); wherein the fluorine-containing compound is one or more of perfluoroether, perfluoroamine, perfluoroketone and hydrofluoroether; the rheology modifier is one or more of polytetrafluoroethylene, fatty acid, fatty acid salt, polyurea and hydrocarbon wax; the functional nano material is one or more of silicon oxide, aluminum oxide, aluminum hydroxide, magnesium hydroxide, hydrotalcite, clay and calcium carbonate. When the electronic liquid seal flame-retardant material is used for liquid seal of electronic devices and systems, flame-retardant and explosion-proof effects can be achieved.

The application provides a processing method of an ultrathin perfluoroether rubber seal, which comprises the following steps: S1, preparing N sets of nested combination molds, cutting and installing a piece of perfluoroether elastomer rubber in one set of nested combination molds, and then placing the nested combination mold in the lower mold of a molding machine mold; S2, heating and molding, and meanwhile, installing perfluoroether elastomer rubber in N-1 sets of nested combination molds; S3, after the molding is completed, taking out the nested combination mold for cooling, and meanwhile, placing one of the N-1 sets of nested combination molds in the lower mold of the molding machine mold, wherein N is an integer greater than or equal to 2; S4, after the taken-out nested combination mold is cooled to be close to the ambient temperature, opening the nested combination mold, and taking out the product; and repeating steps S2-S4. The processing method of the ultrathin perfluoroether rubber seal solves the problem of adhesion between the sealing ring and the mold after the fluorine elastomer is molded, and meanwhile, the production efficiency is improved.

A fluoropolymer is described comprising pendent groups having the formula: —(CF2)a—(OCbF2b)c—(OCeF2e)—SO2—[NX2—SO2(CF2)f—SO2]d—NX1—SO2—Rf wherein Rf is a perfluoroether and X1 and X2 are independently cationic counterions. Also described are various articles including catalyst ink, polymer electrolyte membranes, and membrane electrode assemblies comprising the fluoropolymer described herein; as well as a method of making a fluoropolymer.

The invention relates to a variable temperature Hall effect measuring clamp which comprises a clamp body, a rectangular plate is arranged at one end of the clamp body, four adjusting assemblies are evenly arranged on the rectangular plate, each adjusting assembly comprises a clamping plate, a locking pressing ring, an adjusting groove, adjusting columns and a limiting ring, and the four adjusting columns are rotationally connected to the clamp body. And a locking pressing ring is arranged at the top of the adjusting column. According to the low-temperature compensation mechanism, expansion compensation is achieved at the low temperature through the low-temperature compensation assembly by means of the characteristics of ZrW2O8 low-temperature volume expansion materials and perfluoroether rubber, gaps generated by cold contraction of other assemblies are filled, the locking pressure of the clamping plate and the adjusting column is kept, and the clamping stability is ensured.

The invention relates to a paper deacidification liquid and a preparation method thereof, the paper deacidification liquid comprises a fluorocarbon deacidification liquid and an alkaline deacidification substance, the fluorocarbon deacidification liquid comprises, by volume, 1-10% of perfluoropolyether, 10-30% of a perfluoroether solvent and 60-89% of perfluorohexanone, and the ratio of the mass of the alkaline deacidification substance to the volume of the fluorocarbon solvent is 0.1-10 g / L. According to the fluorine-containing paper deacidification liquid, a synergistic effect is generated by virtue of opposite electrostatic potentials of perfluoroether and perfluoroketone, a steric hindrance effect is formed by virtue of perfluoropolyether with a long molecular chain, and the fluorine-containing paper deacidification liquid with high-stability suspension dispersion is obtained without depending on perfluorocarboxylate and perfluorosilane surfactants. The pH value and the alkali storage capacity of the treated paper are remarkably improved, meanwhile, the paper cannot be wrinkled and adhered, and the color difference, the tensile strength and the handwriting change of the paper are not obvious. The adopted fluorine-containing solvent is high in inertia, rapid in volatilization, low in price and suitable for large-scale paper deacidification treatment.

The present application relates to the technical field of fluororubber foaming composition, in particular to an environment-friendly fluororubber foaming composition for heater, a preparation method and application. The environment-friendly fluororubber foaming composition for heater is prepared from raw materials including perfluoroether rubber, amidine salt compound and metal hydroxide. The obtained environment-friendly fluororubber foaming composition for heater can be vulcanized and foamed during heating, and the foaming and vulcanization are carried out simultaneously, without the need to add new crosslinking agent. The foaming gas generated by foaming is H2O, which is environment-friendly. The present application belongs to the environment-friendly fluororubber foaming composition for heater.