610 results about "Viton" patented technology

The invention relates to the technical field of cables, and discloses a multi-layer composite wrapped high-temperature-resistant anti-aging cable which sequentially comprises a conductor, an insulating cable core, a shielding layer, an outer insulating layer, a fireproof layer, a heat insulation layer, a buffer cushion layer, an armor layer, an anti-aging layer and an outer sheath layer from inside to outside. The fireproof layer is formed by alternately laminating synthetic mica tapes and ceramic boron silicone rubber tapes, a reliable fireproof barrier is formed, and the heat insulation layer is arranged to achieve efficient heat insulation and stable structure through cooperation of gradient pore nano aerogel, ceramic silicone rubber round rods and phase change capsules. The buffering cushion layer is combined with the composite layer, the aluminum oxide hollow ball array and the composite capsule, so that the mechanical buffering and auxiliary heat insulation functions are achieved; the armor layer is woven by stainless steel fibers, the mechanical protection capability is improved, and the anti-aging layer is of a double-layer structure composed of montmorillonite composite fluororubber and an anti-oxidation layer, so that thermal oxidation aging is delayed.

The invention relates to a composite cable, and relates to the technical field of cables, the composite cable comprises a conductor layer, a composite insulating layer, a waterproof layer, a weather-proof sheath layer and an armor layer from inside to outside in sequence, the conductor layer comprises at least six tinned copper conductors, the tinned copper conductors are symmetrically arranged in a regular hexagon shape, dielectric elastomers are filled among the conductors, and the dielectric elastomers are arranged between the tinned copper conductors. The composite insulating layer comprises an inner shielding layer, a main insulating layer and an outer shielding layer from inside to outside, the waterproof layer is a fluororubber extruded layer, the weather-proof sheath layer comprises a bonding transition layer and a weather-proof functional layer, and the armor layer is of a stainless steel band spiral wrapping structure. The composite cable can meet the requirement for high performance in a harsh environment and can show excellent performance under the extreme conditions of low voltage, large day and night temperature difference, strong ultraviolet rays, sand and dust abrasion, acid rain corrosion and the like.

The invention provides a fluororesin fluororubber composite material with high fracture work and a preparation method thereof, and the fluororesin fluororubber composite material comprises the following raw materials by weight: 100-120 parts of fluororubber; 20 to 40 parts of fluororesin micro powder; 1-8 parts of a cross-linking agent; and 0.1-6 parts of an assistant cross-linking agent. The fluororesin and fluororubber composite material disclosed by the invention not only can improve the fracture energy, but also can improve the cleanliness, and also can improve the etching gas resistance.

The invention discloses a polymer sealing ring and a preparation method thereof, and relates to the technical field of polymer materials. The high-temperature-resistant fluororubber sealing gasket is prepared from the following raw materials in percentage by mass: 30 to 50 percent of fluorinated modified silicone rubber, 15 to 25 percent of fluororubber, 7.2 to 16.4 percent of hybrid white carbon black, 2.5 to 6 percent of hydroxyl silicone oil, 8 to 11 percent of plasma fluorinated modified aluminum oxide, 4 to 8 percent of carbon black, 0.8 to 1.4 percent of palm wax, 0.8 to 1.4 percent of internal release agent, 1 to 2 percent of vulcanizing agent, 3 to 5 percent of triallyl isocyanurate and 0.5 to 1 percent of anti-aging agent. The fluorinated modified silicone rubber is prepared by grafting C2-18-perfluoroalkyl iodoethane on a silicone rubber side chain, so that the low temperature resistance of the silicone rubber is effectively improved, and the phenomenon that methyl vinyl silicone rubber is easy to crystallize at low temperature is successfully inhibited; the sealing ring material has good performance at high and low temperatures, and the use temperature range of the sealing ring material is effectively improved.

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 relates to a sealing structure of a flexible waterproof FFC wire harness and a forming process, and belongs to the technical field of automobile electronic wire harness manufacturing, the sealing structure comprises an FFC wire, a connector shell, a sealing ring and a blanking cap, the sealing ring is made of a fluororubber and hydrogenated butadiene-acrylonitrile rubber composite modified material, the connector shell is made of a glass fiber reinforced PP or PA66 material, and the blanking cap is made of a glass fiber reinforced PP or PA66 material. Under the cooperation of a vulcanizing agent system and an anti-aging agent system, double-material injection molding is adopted for integral forming, and double sealing is achieved through interference fit of the blanking cap and the sealing ring. The waterproof grade of the FFC wire harness reaches IP67, the weight is reduced, the size is reduced, the production efficiency is improved, and the FFC wire harness can be widely applied to wet area scenes such as automobile door lines, ceilings and seats, has the cost advantage and the environmental protection benefit, and has remarkable industrial application value.

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 sealing gasket for an energy storage hydrogen production electrolytic cell and a preparation method of the sealing gasket, and belongs to the technical field of sealing gasket production. Comprising the following steps: carrying out surface treatment on glass fibers, and carrying out hot-pressing mixing with a polyimide block copolymer to obtain a supporting layer; glass fibers are subjected to surface treatment and then hot-pressed and mixed with the polyimide block copolymer to obtain a supporting layer; the polytetrafluoroethylene, the triallyl isocyanurate and the nano silicon dioxide are mixed and stirred, and the sealing layer is obtained through injection molding after radiation crosslinking; the epoxy resin matrix, the modified fluororubber and the anti-aging agent are subjected to banburying and vulcanization to obtain the protective layer; and the supporting layer, the sealing layer and the protective layer are sequentially stacked, hot-pressed and compounded to obtain the sealing gasket. The sealing gasket for the energy storage and hydrogen production electrolytic cell is improved in structural stability and has good creep resistance and chemical resistance.

The invention relates to a sealing rubber ring, and belongs to the technical field of sealing materials. The problems that a traditional sealing rubber ring is narrow in temperature resistance range, poor in medium corrosion resistance, unbalanced in mechanics and elasticity, short in anti-aging service life and prone to precipitation and pollution are solved. The material is composed of a base material, a composite anti-precipitation filler and auxiliary components, the base material contains four components including modified fluororubber and the like, the composite anti-precipitation filler contains modified nano calcium carbonate and the like, and the auxiliary components contain vulcanizing systems, reinforcing systems and the like. The modified fluororubber is prepared by a specific process. The preparation method comprises the following steps: banburying, standing, vulcanizing, cooling and removing flash. The rubber ring has the advantages of wide temperature-resistant range, medium corrosion resistance, aging resistance, balanced mechanical properties and no precipitation pollution, and is suitable for industrial scenes with extreme temperature difference, strong corrosion and the like.

The invention provides a colorless and transparent fluororubber intelligent wearable material as well as a preparation method and application thereof, and belongs to the field of rubber materials. By screening the filler added with the fluororubber and compounding the fluorine-containing resin micro-powder with different sizes, the dispersity of the fluororubber is improved, a better reinforcing effect is achieved, the transparency of the fluororubber is ensured, meanwhile, the fluororubber can have high and good mechanical properties, and more diversified requirements in the field of intelligent wearing are met. The fluororubber is simple and efficient in preparation process and suitable for large-scale industrial production, and the market vacancy in the field of transparent fluororubber can be effectively filled.

The invention discloses a corrosion-resistant oil seal and a surface treatment process thereof, and relates to the technical field of sealing elements. The invention comprises the following components: an outer corrosion-resistant layer: fluororubber or hydrogenated nitrile rubber, the total content of which is 40-60%; the total content of the polytetrafluoroethylene nano-particles is 10 to 20 percent; the total content of silicon carbide or aluminum oxide micro powder is 5-15%; and a graphene dispersion liquid. Through a multi-protection system of the fluororubber (FKM) and polytetrafluoroethylene (PTFE) nano-particle composite outer layer, the chemical nickel-phosphorus plating (Ni-P) alloy plating layer and the silicon dioxide / titanium dioxide nano-coating, super-strong corrosion resistance is achieved, corrosion medium permeation is blocked by the chemical inertness of PTFE, the Ni-P plating layer forms a passive film in an acid environment to inhibit electrochemical corrosion, and the corrosion resistance is good. The compact structure of the silicon dioxide / titanium dioxide coating further blocks erosion, compared with a traditional oil seal (swelling fracture), the corrosion resistance is remarkably improved, the surface coating can be self-repaired through the silicon dioxide reaction when being slightly scratched, and the service life under the harsh working condition is prolonged.

The invention discloses a high-strength wear-resistant protective material for a power cable and a preparation method of the high-strength wear-resistant protective material, and relates to the technical field of preparation of wear-resistant materials. The composite material is prepared from 40-60 parts of polyether-ether-ketone resin, 15-25 parts of silicon carbide whiskers, 10-20 parts of basalt fibers, 5-10 parts of a silane coupling agent, 3-8 parts of a lubricant, 2-6 parts of an antioxidant, 1-3 parts of nano titanium dioxide, 0.5-2 parts of a rare earth compound, 1-3 parts of boron nitride nanotubes, 0.5-2 parts of graphene nanoplatelets and 1-2 parts of fluororubber micro powder. The length-diameter ratio of the silicon carbide whiskers is 50-100, the diameter of the basalt fibers is 5-15 microns, the pipe diameter of the boron nitride nanotubes is 5-20 nm, the length of the boron nitride nanotubes is 100-500 nm, the thickness of the graphene microchips is 1-5 nm, and the sheet diameter of the graphene microchips is 1-10 microns. The tensile strength of the material is not lower than 150 MPa, the shore hardness is not lower than D85, the abrasion loss is low, the insulativity is good, the weather resistance and the chemical corrosion resistance are good, a special preparation process is adopted, and the performance is optimized; the cable sheath can be used for protecting various power cables and prolonging the service life of the cables.

The invention discloses a low-dielectric-constant polyamide material, and relates to the technical field of high polymer materials. The invention discloses a low-dielectric-constant polyamide material. The composite material is prepared from the following raw materials in parts by weight: 35 to 45 parts of polyamide 66, 5 to 10 parts of polytetrafluoroethylene micro powder, 8 to 12 parts of modified porous siloxane microspheres, 3 to 7 parts of modified nano zinc oxide, 10 to 15 parts of glass fibers, 4 to 8 parts of polyether-ether-ketone, 1 to 3 parts of graphene nanosheets, 3 to 5 parts of fluororubber, 1 to 2 parts of a titanate coupling agent, 0.3 to 0.7 part of an antioxidant 1010, 0.5 to 1.0 part of ethylene bis stearamide and 0.1 to 0.3 part of an ultraviolet absorbent UV-531. The low-dielectric-constant polyamide material has the remarkable advantages that the raw materials are scientifically proportioned, and various modified components are contained to enhance the performance; all the components are subjected to special treatment, so that the compatibility is good; the preparation process is rigorous, and the material has excellent dielectric properties; and the material also has good heat resistance and weather resistance and strong mechanical properties, and is suitable for various scenes with high dielectric constant requirements.

The invention discloses a corrosion-resistant double-suction type chemical pump. The corrosion-resistant double-suction type chemical pump comprises a pump body, an impeller assembly, a sealing device and a driving mechanism. The sealing device adopts a fluororubber elastic compensation piece and is provided with a cooling system, a shock pad and a drainage groove are arranged at the bottom of the supporting frame, and a convenient access hole is formed in the top of the supporting frame. By optimizing the material and structural design, the corrosion resistance and maintenance convenience are remarkably improved, the problems that under the strong corrosion working condition, aging is likely to happen, and sealing fails are effectively solved, and the high practicability and popularization value are achieved.

The invention discloses an ethylene-propylene-diene monomer rubber working at a high temperature of 180 DEG C. The ethylene-propylene-diene monomer rubber has the characteristics of excellent insulativity, high and low temperature resistance, acid and alkali resistance, weather resistance, high elasticity and flexibility, has more excellent thermal stability and ultraviolet resistance, and has lower wet permeability than natural rubber, butyronitrile rubber and silica gel; the invention also provides a preparation process aiming at the formula, the process is adopted for control, and a two-stage method is adopted for rubber mixing, so that the advantages of each component in the formula are further exerted, and the temperature resistance, the sealing property and the strength of the ethylene propylene diene monomer are improved; the ethylene propylene diene monomer provided by the invention can be widely applied to static sealing products and can be used within the range of 180 DEG C or below, the technical problem that fluororubber with higher cost has to be adopted when the temperature exceeds 165 DEG C is solved, and the ethylene propylene diene monomer has a wide application prospect. The invention belongs to the technical field of rubber processing.

The application relates to the field of chemical-proof fabrics, and particularly discloses a flame-retardant chemical-proof fabric and a preparation process thereof. The flame-retardant chemical-proof fabric comprises, from outside to inside, an outer layer, a bonding layer, a framework layer, a bonding layer and an inner layer which are sequentially contacted, the outer layer is a barrier layer, the inner layer is a barrier layer or an adsorption layer, the framework layer is selected from at least one of a composite fabric of aramid fiber / polyimide fiber, a basalt fiber cloth, a glass fiber cloth, a flame-retardant polyester cloth and a flame-retardant acrylic fiber cloth, the barrier layer is selected from at least one of a PVC / TPU composite film, a PVC film, a PTFE film, a PE film, silicone rubber, fluororubber, butyl rubber, chloroprene rubber and natural rubber, and the adsorption layer comprises a mixed fabric layer formed by nylon fiber and polyester fiber containing an adsorption material. The flame-retardant protective fabric has the advantages of high flame-retardant capacity, good chemical-proof effect, excellent puncture resistance and tensile resistance, can absorb moisture and sweat, and is comfortable to wear.

The invention relates to the technical field of rubber materials, and discloses fluororubber for a high-temperature oxygen sensor and a processing technology of the fluororubber. The processing technology comprises the following steps: S1, preparing fluorinated modified methyl vinyl silicone rubber from methyl vinyl silicone rubber and 1H, 1H, 2H, 2H-perfluorodecanethiol; s2, preparing glycerol modified silicone rubber from methyl vinyl silicone rubber and 1-thioglycerol; taking glycerol modified silicone rubber, adding into a mixed solvent of tetrahydrofuran and water, uniformly stirring, adding urea, heating, dropwise adding phosphoric acid, carrying out heat preservation reaction, removing the solvent, and drying to obtain phosphate modified methyl vinyl silicone rubber; and S3, adding the broken fluororubber, the fluorinated modified methyl vinyl silicone rubber and the phosphate modified methyl vinyl silicone rubber into an open mill, uniformly mixing, adding the composite filler and magnesium oxide, mixing, adding the vulcanizing agent and the assistant crosslinking agent, uniformly mixing, and vulcanizing to obtain the fluororubber for the high-temperature oxygen sensor.

The invention belongs to the field of polymer elastomer materials. The invention provides a modified fluorine-containing rubber and a preparation method thereof, the modified fluorine-containing rubber is obtained by modifying matrix rubber by a compound modified inorganic filler with a linear or branched polyether structure, a main chain connected with hydroxyl and a side chain containing a sulfydryl group, and the surface of the inorganic filler has hydroxyl. The dispersity and precipitation resistance of the modified fluorine-containing rubber and the inorganic filler in the fluorine-containing rubber are remarkably improved, the modified fluorine-containing rubber and the inorganic filler are kept stable in a long-term high-temperature and strong-corrosion medium, a hydrogen bond and covalent bond dual-interface bonding mechanism is adopted, a high-stability interface is constructed in a low-polarity system through the synergistic effect of hydrogen bond adsorption and covalent bonding, and the high-stability fluorine-containing rubber is obtained. The super-uniform dispersion and interface enhancement of the inorganic filler in a low-polarity fluorine-containing rubber system are realized, and the inorganic filler can be widely applied to the fields of semiconductor high-cleanliness sealing elements, high-temperature chemical corrosion-resistant elastomers and the like.

The invention relates to the field of rubber, in particular to high-strength fluororubber and a preparation method thereof. The fluororubber comprises the following components in parts by weight: 100 parts of raw fluororubber, 20-30 parts of a reinforcing agent, 10-20 parts of a filling agent, 7-16 parts of an acid acceptor, 0.1-0.5 part of a coupling agent, 0.1-1 part of a release agent, 2-5 parts of a vulcanizing agent and 1.2-2 parts of a vulcanization accelerator. The fluororubber material prepared by the invention not only has the advantages of high temperature resistance, oil resistance and corrosion resistance, but also has excellent strength and toughness, is suitable for being used as a material for sealing washers and liners of chemical equipment, can be kept stable in various chemical and solvent environments, and ensures long-term normal operation of the equipment.

The invention relates to the technical field of chemical coatings, in particular to a far infrared invisible fluororubber coating. The coating is prepared from 40-60 parts of fluororubber, 10-20 parts of modified core-shell hydroxylated flaky aluminum, 5-10 parts of carbon black and auxiliaries. A three-stage modification process is innovatively adopted, specifically, firstly, an aluminum sheet is subjected to hydroxylation treatment through triethanolamine to enhance the surface activity, then, a conductive polymer coating layer is formed through in-situ polymerization of 3, 4-ethylenedioxythiophene, and finally, fluorination modification is conducted through heptadecafluorooctane sulfonic acid. The gradient interface structure realizes a chemical bonding-conductive network-polarity matching synergistic effect, so that the coating still keeps high adhesive force and high impact resistance when the emissivity of the coating at the wave band of 8-14 microns is less than or equal to 0.3. The coating provided by the invention is particularly suitable for infrared stealth protection of military equipment, and solves the technical problem that the content of the high-reflection filler and the mechanical property are difficult to consider at the same time.

The utility model relates to the technical field of rubber sealing ring performance detection devices, in particular to a material toughness detection device for preparing a fluororubber sealing ring, which comprises a device body, a first support and a second support are sequentially fixed on the device body from top to bottom, a cylinder is fixed on the first support, and a piston rod is mounted at the output end of the cylinder. A pressing plate is fixed to the bottom end of the piston rod, an outer fixing ring is fixed to the second support, a rotating disc is rotationally arranged in the outer fixing ring, a plurality of arc-shaped grooves are formed in the rotating disc, a plurality of first I-shaped clamping grooves are formed in the outer fixing ring, movable rods penetrating through the arc-shaped grooves are slidably clamped in the first I-shaped clamping grooves, and first clamping plates are fixed to the movable rods; according to the multi-directional tensile strength detection device for the fluororubber sealing ring, the multi-directional tensile strength detection test of the fluororubber sealing ring can be realized at one time, and the working efficiency of the tensile strength detection of the fluororubber sealing ring is greatly improved.

The invention relates to the field of power cables, and particularly discloses an acid and alkali resistant waterproof power cable. The acid and alkali resistant waterproof power cable comprises a conductor layer, an insulating layer and a sheath layer which are sequentially arranged from inside to outside, the preparation method comprises the following steps: S1, preparing the conductor layer: smelting electrolytic copper, tin, silver and rare earth elements, and then performing wire drawing, and controlling the wire drawing speed to be 10-15m / s to obtain a conductor wire core; s2, extrusion of an insulating layer: mixing fluororubber, epichlorohydrin rubber, nano-silica and a flame retardant, and extruding the mixture at 70-90 DEG C by a twin-screw extruder to coat the conductor layer; s3, extruding a sheath layer: mixing the raw materials, and coating the raw materials outside the insulating layer at 60-85 DEG C by a single screw extruder; s4, irradiation crosslinking: carrying out electron beam irradiation on the coated cable; and S5, cooling and rolling. The cable can be used in a highly corrosive environment, and has the advantage of avoiding premature failure of the sheath layer of the power cable in the highly corrosive environment.

The invention relates to the field of friction materials, and discloses an electromagnetic brake friction material used for an ultra-long time working condition and a preparation method of the electromagnetic brake friction material. The modified polyimide is a polyimide-silicon rubber interpenetrating complex, and the preparation method of the modified polyimide comprises the following steps: blending a silicon rubber prepolymer with a polyimide precursor and a silicon rubber prepolymer curing agent, and curing to obtain the interpenetrating complex; the reinforcing material comprises aramid pulp, copper fibers, potassium magnesium titanate lamellas, tetrapod-like zinc oxide whiskers and modified aluminum titanate fibers; the friction increasing material comprises nano aluminum hydroxide, fluororubber powder, barite, silicon carbide, feldspar powder, modified white carbon black and cashew nut shell oil friction powder; the antifriction material comprises halloysite nanotubes coated with redox graphene, molybdenum carbon phosphate and graphite fluoride. The friction material provided by the invention can meet the requirements of strength, heat resistance and wear resistance under an ultra-long working condition, and meanwhile, the thermal expansion at high temperature can also be reduced.

The invention discloses a high-wear-resistance oil seal and a preparation method thereof, and relates to the technical field of sealing element manufacturing. The fluororubber-silicone rubber composite material comprises the following components: a matrix material: fluororubber and silicone rubber are blended according to a mass ratio of 1: 1, and the total content is 60-80%; through the synergistic effect of the fluororubber and silicone rubber composite matrix, the carbon fiber and glass fiber reinforcement system and the molybdenum disulfide and graphite filler, the mechanical property of the oil seal is remarkably improved: the high-temperature resistance of fluororubber is combined with the low-temperature elasticity of silicone rubber, so that the oil seal keeps stable physical properties; a composite reinforcing system of the carbon fibers and the glass fibers remarkably improves the binding force of the material and a matrix, nano-scale compounding of the molybdenum disulfide and the graphite utilizes the self-lubricating property and the high-hardness characteristic of the molybdenum disulfide and the graphite, the friction coefficient is greatly reduced, and the synergistic effect of the antioxidant and the anti-ultraviolet agent effectively delays the aging process of the material in long-term use, so that the service life of the material is prolonged. And the long-term stability in a complex environment is ensured.

The utility model relates to the field of rubber processing, in particular to a forming and demolding device for fluororubber production. The utility model relates to a forming and demolding device for fluororubber production, which is capable of automatically demolding. According to the technical scheme, the forming and demolding device for fluororubber production comprises a base, a supporting base, an air cylinder, a material receiving plate, a fluororubber forming machine and a demolding assembly. A supporting seat is fixedly connected to the base, sliding grooves A are formed in the supporting seat, the sliding grooves A are symmetrically formed in the right side of the supporting seat, an air cylinder is fixedly connected to the supporting seat, a push rod of the air cylinder is fixedly connected to the left side of a material receiving plate, and a plurality of through holes are formed in the material receiving plate; the demolding assembly is installed on the right side of the top of the supporting base. The demolding block is pushed by the pushing and pressing machine to move downwards and is matched with the material receiving plate which is pushed rightwards to the interior of the supporting frame by the air cylinder, so that cooled finished fluororubber on the material receiving plate can be effectively and quickly pushed out.

The application relates to the technical field of rubber sealing materials, and discloses a high and low temperature resistant fluororubber sealing element and a preparation method thereof. The high and low temperature resistant fluororubber sealing element is prepared from fluororubber raw rubber, reinforcing fillers, inorganic fillers, acid absorbents, processing aids and vulcanizing agents, wherein the acid absorbents are prepared from metal hydroxides and metal oxides in a mass ratio of (2-5):(1-3), and the processing aids are prepared from amide flow aids, polyethylene wax and fatty acid metal salts in a mass ratio of (1-2.5):(0.8-2):(0.5-1). The prepared high and low temperature resistant fluororubber sealing element has excellent mechanical properties, high temperature resistance, low temperature resistance and compression permanent deformation performance, and effectively solves the technical problems of easy aging of existing fluororubber sealing elements at high temperatures, large compression permanent deformation and easy brittle cracking at low temperatures. The preparation method adopts a mixing and vulcanization process, the preparation method is simple, and the method is suitable for large-scale production.

A clearing head 10 includes annular scraper edge 12 and rows of openings 14, 16. A clearing tool 100 has a one-piece combined shaft 24 and clearing head 10. Wiper ring 49 includes inner first material 49a around an opening 49c for the shaft 24. The first material may have molybdenum / molybdenum disulphide. A resilient second material 49b is provided around the first material. The resilient second material is or includes FKM. In a ram 38, the resilient second material can exert inward radial pressure to the first material by reacting against a ram interior wall 39. The ram can incline from horizontal and vertical by an angle a e.g. between at least 10° and 80°, or between at least 20° and 70°, or between at least 30° and 60°, or between at least 25° and 45°, or around 30°.

The utility model discloses a kind of flexible inner container pressure-bearing hot water storage tank, belong to the technical field of hot water storage equipment, including water storage tank main body, water inlet pipe is installed on water storage tank main body upper end, water outlet pipe is installed on water storage tank main body lower end, flexible inner container is fixedly connected in water storage tank main body, multiple evenly distributed pressure-bearing rings are arranged between flexible inner container and water storage tank main body inner wall, pressure-bearing ring includes the connecting ring being connected with water storage tank main body inner wall, multiple evenly distributed elastic contact rods are embedded and arranged in connecting ring, flexible connecting rod is connected between each elastic contact rod and flexible inner container, the flexible inner container is made of fluorine rubber, silicon rubber or temperature-resistant polyurethane material, elastic contact rod is made of elastic metal material, and rubber layer is covered on the surface of elastic contact rod, can be realized through setting pressure-bearing ring, can promote its inner flexible inner container when storing water has stronger buffering effect, improve the pressure-bearing performance of flexible inner container.

The present invention discloses a fluororubber-in-cloth material for large oil cylinder V-group seals and its preparation method. The fluororubber-in-cloth material comprises a polyester cloth as a skeleton material and a fluororubber compounded onto the polyester cloth surface via a treatment agent; the treatment agent is a dopamine-grafted silane coupling agent, KH-550; and the fluororubber is a vinylidene fluoride-hexafluoropropylene co-fluororubber. This invention solves the bonding problem between the fluororubber and the polyester cloth. The resulting fluororubber-in-cloth material exhibits excellent water and salt spray resistance in marine environments, meeting the high reliability requirements of large oil cylinder V-group seals over a 20-year service life.

The invention discloses an antistatic teflon sleeve and a preparation method thereof. The antistatic teflon sleeve is prepared from the following components in parts by weight: 80-95 parts of teflon resin, 5-20 parts of a core-shell structure conductive filler, 1-3 parts of a compatilizer, 0.5-2 parts of a flexibilizer and 0.1-0.5 part of an antioxidant. The outer protective layer is prepared from the following components in parts by weight: 70 to 85 parts of ethylene-tetrafluoroethylene copolymer, 5 to 15 parts of modified nano silicon dioxide, 5 to 10 parts of fluororubber, 1 to 3 parts of antistatic aid and 0.1 to 0.5 part of ultraviolet absorbent. Through the design of the core-shell structure conductive filler, the core layer nano copper powder provides high conductivity, the shell layer PVDF has good compatibility with the Teflon base material, the surface modification layer further enhances the interface bonding force, the volume resistivity of the inner layer base material is reduced, and the antistatic requirement is met; the conductive filler is uniformly dispersed in the base material instead of a surface coating, so that the antistatic performance failure caused by friction or bending is avoided, and the antistatic performance is lasting and stable.