54 results about "Expanded PTFE" patented technology

The utility model discloses a graphene carbon heat-conducting fin and reversible desiccant membrane combined membrane component for demisting an automobile lamp, a graphene carbon heat-conducting fin layer comprises a heat absorption area and a heat conduction area, the heat absorption area is arranged towards a heating element in the automobile lamp and is used for absorbing infrared heat, the heat conduction area is formed by extending from the heat absorption area to a cold area which is easy to fog, and the reversible desiccant membrane is arranged in the heat conduction area. The heat is exported for demisting; the reversible drying agent diaphragm layer is arranged in the heat conduction area and comprises a supporting framework layer, a functional layer and active filler; the support framework layer is an expanded polytetrafluoroethylene membrane with a microporous structure, the fog absorbent slurry forms a functional layer on the surface of the expanded polytetrafluoroethylene membrane, and the fog absorbent slurry is embedded into the microporous structure to form active filling. According to the utility model, heat generated by electrical elements in the automobile lamp is utilized to realize moisture absorption and desorption circulation of the reversible drying agent diaphragm, so that the fogging problem of a novel flat and long and narrow belt type automobile lamp is effectively solved, the structure is simple, and the cost is low.

The utility model discloses a getter film with high initial outbreak rate and lasting moisture absorption rate for a perovskite battery, a support framework layer is an expanded polytetrafluoroethylene microporous film layer, and an active layer is a getter active layer formed by infiltrating a getter into a pore structure of the expanded polytetrafluoroethylene microporous film layer. The composite layer is a getter composite layer formed on at least one side surface of the expanded polytetrafluoroethylene microporous membrane layer through a getter. Through the above mode, the periphery of the active material layer of the perovskite cell in a service environment can be kept in a vacuum state for a long time, and the perovskite cell is ensured to be in a high photoelectric conversion efficiency and a stable state for a long time; the getter film is coated with a back adhesive layer and is non-corrosive, and the getter film can be directly pasted on a glass cover plate of a perovskite cell or on silver, aluminum and copper electrodes for packaging after the release film is uncovered during use; and the initial explosion rate is high, and moisture and oxygen can be quickly absorbed in the packaging cavity within two hours, so that a vacuum state is achieved.

The invention discloses a negative-pressure-resistant enhanced PFA (Polyfluoroalkoxy) lining pipeline material and a manufacturing process thereof. The material comprises the following components in parts by weight: 100 parts of PFA resin, 1-10 parts of fluorinated nanofiller, 5-15 parts of perfluorinated sulfonic acid resin and 8-35 parts of an expanded polytetrafluoroethylene fiber skeleton. The material has a multi-scale reinforced structure: an expanded polytetrafluoroethylene skeleton is embedded into a PFA matrix to form a macroscopic reinforced structure, the perfluorinated sulfonic acid resin is attached to the surface of the skeleton to form an interface compatibilization layer, and the fluorinated nano filler is dispersed in the matrix to form a nano reinforced phase. The process comprises the steps of skeleton plasma activation and interface compatibilization treatment, nano filler and PFA melt blending, pressure forming, heat treatment and the like. The mechanical strength, creep resistance and negative pressure resistance of the PFA lining material are remarkably improved, and the PFA lining material is suitable for the fields of chemical engineering, pharmacy, semiconductors and the like.

This invention relates to the field of polytetrafluoroethylene (ePTFE) membrane technology. Addressing the problem that existing expanded PTFE films cannot meet the high-performance standards of superhydrophobicity and superoleophobicity, this invention specifically discloses an expanded PTFE composite membrane and its preparation method. The expanded PTFE composite membrane includes an ePTFE base membrane and an fPTFE / SiO2 particle composite layer disposed on the surface of the ePTFE base membrane. The fPTFE / SiO2 particle composite layer includes a PTFE composite and SiO2 particles. The PTFE composite comprises polyethylene oxide and PTFE in a dry weight ratio of 1:10-30, and the SiO2 particles have a particle size of 100-1000 nm. By coating the ePTFE base membrane with PTFE and SiO2 particles to construct the fPTFE / SiO2 particle composite layer, and then modifying the membrane surface with silica-fluorination, the distribution of SiO2 particles can be specifically controlled to impart superhydrophobic and superoleophobic properties to the expanded PTFE composite membrane, with both water and oil contact angles >150°.

The utility model discloses a standard metric thread waterproof and breathable pressure balance valve, include: upper cover, surface circumferential even distribution several U shape through -hole, be used for air exchange and block foreign matter and enter, base, with upper cover cooperation and connection, constitute valve body main part, inner cover, be located on the channel of inside air exchange of base, waterproof and breathable membrane, make by the modification treatment of the surface hydrophobic oleophobic of expanded polytetrafluoroethylene ePTFE microporous membrane, micropore diameter is 0.01~15um, fixed in the air intake side of inner cover, form waterproof and breathable barrier, through above -mentioned mode, the utility model can effectively solve the sealing problem of new energy automobile battery package in the use process because of the internal and external pressure difference, prevent the invasion of water vapor, dust and chemical liquid simultaneously, guarantee the safe operation of battery package, prolong the battery life, improve the reliability and safety of new energy automobile.

The invention relates to a preparation method of an artificial blood vessel, the artificial blood vessel is composed of a porous support layer, a biodegradation layer and an antithrombotic layer, and the method comprises the following steps: soaking an expanded polytetrafluoroethylene substrate with silver nitrate doped polyvinyl pyrrolidone-poly-N-isopropylacrylamide to obtain the porous support layer; and then assembling a biodegradable material and an antithrombotic material as a biodegradable layer and an antithrombotic layer. The invention also relates to the artificial blood vessel prepared by the method.

The invention relates to the technical field of polytetrafluoroethylene films, and particularly discloses an expanded polytetrafluoroethylene composite film and a preparation method thereof in order to solve the problem that an existing expanded polytetrafluoroethylene film is difficult to meet the super-hydrophobic and super-oleophobic high-performance standard. The expanded polytetrafluoroethylene composite membrane comprises an ePTFE base membrane and an fPTFE / SiO2 particle composite layer arranged on the surface of the ePTFE base membrane, the fPTFE / SiO2 particle composite layer comprises a polytetrafluoroethylene compound and SiO2 particles, the polytetrafluoroethylene compound comprises polyethylene oxide and polytetrafluoroethylene in a dry weight ratio of 1: (10-30), and the particle size of the SiO2 particles is 100-1000nm. The preparation method comprises the following steps: coating an ePTFE base membrane with polytetrafluoroethylene and SiO2 particles, constructing an fPTFE / SiO2 particle composite layer, and then carrying out silicon dioxide-fluoridation modification on the surface of the membrane, so that specific regulation and control on SiO2 particle distribution and the like can be realized, and the expanded polytetrafluoroethylene composite membrane is endowed with super-hydrophobic and super-oleophobic characteristics that the water-oil contact angle is greater than 150 degrees.

The utility model relates to the technical field of soles, in particular to a multi-layer composite EVA (ethylene-vinyl acetate) insole structure, which comprises an EVA insole main body and a surface layer, the bottom of the surface layer is connected with the top of the EVA insole main body in a bonding manner through an adhesive, a breathable structure is arranged between the surface layer and the EVA insole main body, the breathable structure comprises through holes arranged on two sides of the top of the surface layer, and the bottom of the surface layer is connected with the top of the EVA insole main body. A reserved cavity is formed in the top of an inner cavity of the eva insole body and communicated with the outside through through holes, nine air vents are formed in one end of the front side and one end of the rear side of the eva insole body respectively, expanded polytetrafluoroethylene nets are arranged on the inner sides of the nine air vents respectively, and the expanded polytetrafluoroethylene nets are arranged on the inner sides of the nine air vents respectively. The interior of the reserved cavity is also communicated with the outside through the ventilation opening, and the interior of the reserved cavity is filled with bamboo charcoal fibers, so that the foot can be kept dry and comfortable, peculiar smell generated by long-time wearing can be effectively reduced, and cleanliness and comfort in the shoe are improved.

The invention discloses an expanded polytetrafluoroethylene-based hybrid film, application and a preparation method thereof, the hybrid film comprises a porous structure skeleton layer and a functional active filler, the skeleton layer is an expanded polytetrafluoroethylene film with a porous structure, the functional active filler is ceramic / boron nitride functional particles, and the functional active filler is an expanded polytetrafluoroethylene film with a porous structure. Ceramic / boron nitride functional particles are introduced in the expanded polytetrafluoroethylene film forming process, and the ceramic / boron nitride-expanded polytetrafluoroethylene-based hybrid film with a three-dimensional network structure is formed. Through the mode, the three-dimensional network micro-nano pore structure is combined with the synergistic filling of the ceramic / multi-particle-size interworking boron nitride, so that the thin film shows extremely low dielectric constant and dielectric loss under a high-frequency condition, and the high-frequency and high-speed signal transmission requirements of 5G / 6G communication and the like are met; the composite material has excellent thermal conductivity, super-strong bending resistance and low thermal expansion coefficient, and the heat dissipation capability and long-term reliability of an electronic device are improved.

The application belongs to the technical field of medical biomaterials, and provides a natural polysaccharide-polyphenol network polytetrafluoroethylene artificial blood vessel and a preparation method, wherein the natural polysaccharide-polyphenol network polytetrafluoroethylene artificial blood vessel comprises an expanded polytetrafluoroethylene artificial blood vessel base body, further comprises a polydopamine-acetone copolymerization intermediate layer attached to the whole surface of the base body, and a natural polysaccharide-polyphenol network coating layer covalently crosslinked to the inner surface of the intermediate layer; the natural polysaccharide-polyphenol network coating layer is formed by tannic acid as a natural crosslinking agent and sulfonated carboxymethyl chitosan through covalent bonds, hydrogen bonds and hydrophobic interaction; the outer surface of the base body is rich in methyl propionyl groups and retains hydrophobicity; the application has excellent anticoagulant properties, good biological safety, selective functionalization of the inner and outer surfaces, excellent anti-protein adsorption properties and good coating stability, and has a simple preparation process and low cost.

The invention discloses a medical expanded PTFE processing method which comprises the following steps: S1, raw material treatment; s2, primary extrusion; s3, carrying out secondary extrusion; s4, heating and deoiling; s5, segmental calcining and drafting: continuously feeding the oil-removed linear material into a calcining station, calcining to a molten state, and dividing into two stages: stage I (heating and calcining): feeding the linear material into a first heating device, arranging a groove body in the first heating device, enabling the linear material to pass through the groove body, supporting and protecting the material by the groove body, and feeding the linear material into a second heating device; deformation or deviation of the material during high-temperature calcination is avoided; and a second stage (heating drafting): the linear material treated in the first stage enters a second heating device, a supporting plate with radian is arranged in the second heating device, and the linear material is attached to the surface of the supporting plate and passes through the second heating device. The problems that according to an existing processing method, mixing is uneven, the line breaking rate is high, additive recycling is poor, and the biocompatibility of a finished product is difficult to guarantee are solved.

An expanded polytetrafluoroethylene-based film-type mist absorber film and a preparation method therefor. A support framework layer (2) of the film is an expanded polytetrafluoroethylene film having a microporous structure; a mist absorber paste forms a mist absorbing functional layer (1) on the surface of the expanded polytetrafluoroethylene film; the mist absorber paste is embedded in the microporous structure to form active filling. During preparation, a solvent, a coupling agent and mist absorber powder are added to organic binder resin, which is then applied to an expanded polytetrafluoroethylene film by using a high-precision surface controllable coating composite technology, so as to prepare a film.

The invention discloses a standard meter thread pressure balance valve for moisture resistance, water resistance and air permeability and a membrane assembly thereof. The membrane assembly comprises a waterproof and air-permeable membrane which is prepared by performing surface hydrophobic and oleophobic modification treatment on an ePTFE (expanded polytetrafluoroethylene) microporous membrane; the elastic composite body is arranged between the waterproof breathable membrane and the valve plate; the elastic valve plate is of a thin-wall structure and is provided with a dynamic opening and closing seam; the membrane assembly is arranged on an airflow channel of the pressure balance valve body, the waterproof breathable membrane is arranged at the outer side end of the airflow channel and used for blocking external liquid and dust, and the valve plate is arranged at the inner side end of the airflow channel and used for dynamically adjusting internal air pressure balance. By means of the mode, the waterproof breathable pressure-adjusting breathable film has the dual functions of water resistance, breathability and pressure adjustment, external liquid and particulate matter are prevented from entering, and the breathability can be automatically adjusted according to the pressure difference; the water vapor is controlled from the source to enter the battery pack, the internal and external pressure balance of the power battery pack is effectively solved, and the internal fogging and condensation phenomena are eliminated.

The invention belongs to the technical field of medical supplies, and particularly relates to an implant restoration screw channel sealing material and a preparation method thereof.The preparation method comprises the following steps that S1, a polytetrafluoroethylene belt is prepared, and an expanded polytetrafluoroethylene film is obtained; s2, sodium-naphthalene complex surface modification: soaking the expanded polytetrafluoroethylene film in a sodium-naphthalene complex treatment solution to defluorinate the surface and form a carbonized layer, and then cleaning with ethanol and deionized water; s3, chitosan-chlorhexidine acetate modification: spraying a chitosan / chlorhexidine acetate stable solution on the surface of the expanded polytetrafluoroethylene film treated in S2 to form a chitosan-chlorhexidine acetate modified coating; and S4, preparing the expanded polytetrafluoroethylene film treated in S3 into a columnar solid, and performing high-temperature steam sterilization to obtain the implant restoration screw channel sealing material.

The invention relates to the field of fuel cells, in particular to a high-performance membrane electrode for electrolyzed water as well as a preparation method and application of the high-performance membrane electrode. The membrane electrode comprises a proton exchange membrane and catalyst layers coating the two sides of the proton exchange membrane, and the proton exchange membrane comprises a sulfonated polyethersulfone base membrane, a reinforcing layer covering the sulfonated polyethersulfone base membrane and a sulfonated polyethersulfone top layer membrane covering the reinforcing layer; the enhancement layer is an expanded polytetrafluoroethylene porous membrane; and the catalyst layer contains sulfonated polyethersulfone. Meanwhile, an integrated thermal crosslinking strategy is adopted in the preparation method, and the ionomer layer and the membrane substrate are jointly crosslinked, so that the body proton conductivity is remarkably improved, and the interface contact resistance is reduced.

The invention provides a flexible sensing film and a preparation method thereof, and relates to the technical field of functional materials.The preparation method of the flexible sensing film comprises the steps that S1, an expanded polytetrafluoroethylene film is polarized so that the surface of the expanded polytetrafluoroethylene film can carry charges, and a polarized expanded polytetrafluoroethylene film is obtained; s2, placing the polarized expanded polytetrafluoroethylene film in liquid silicone rubber, and performing curing treatment to enable the cured silicone rubber to wrap the polarized expanded polytetrafluoroethylene film to form a flexible composite film; s3, preparing a flexible conductive electrode on the upper surface of the flexible composite film to obtain a flexible sensing film; the flexible conductive electrode comprises a silver nanowire. By adopting the method disclosed by the invention, the flexible sensing film with a contact and non-contact dual-mode sensing function can be prepared, and the flexible sensing film has relatively strong capability of resisting the influence of an external environment.

The present application provides a kind of expanded polytetrafluoroethylene conductive sealing film, including expanded polytetrafluoroethylene film and carbon fiber conductive layer, and the expanded polytetrafluoroethylene film has porosity;Carbon fiber conductive layer and expanded polytetrafluoroethylene film are compounded together by rolling, and carbon fiber conductive layer includes mutually connected surface layer and filling part, surface layer is arranged on the surface of at least one side of expanded polytetrafluoroethylene film, and filling part is filled in the porosity of expanded polytetrafluoroethylene film;The composition of carbon fiber conductive layer includes carbon-based fiber material, conductive powder and binder, and carbon-based fiber material is carbon fiber and / or carbon whisker.The expanded polytetrafluoroethylene conductive sealing film provided by the present application not only has the advantages of light weight, high and low temperature resistance, good sealing performance, etc., but also has good conductivity, and the bonding force between carbon fiber conductive layer and expanded polytetrafluoroethylene film is strong, and carbon fiber conductive layer is not easy to fall off.

Expanded polytetrafluoroethylene (ePTFE) tubing has a thermoplastic bond coat coating on its outer surface for use as, for example, a flexible liner for a catheter. The thermoplastic bond coat coating can be anchored into the pores of the ePTFE, but advantageously not permeate into the inner surface of the tubing. In this manner, the outer surface of the tubing may adhere to the outer sheath material while the inner surface of the tubing remains lubricity.

The utility model discloses a waste incineration flue gas treatment system which comprises a waste incinerator, a waste heat boiler, a baking soda dry deacidification tower, an SCR denitration bag type dust collector, a waste heat utilization device, an induced draft fan and a chimney which are sequentially arranged in the flue gas flowing direction. An SNCR system is arranged on the garbage incinerator, an ejector of the SNCR system sprays a denitration agent into the garbage incinerator, and the denitration agent reacts with NOx to be reduced into N2; the dry-process deacidification tower is provided with a storage, preparation and injection system of baking soda dry powder and is used for injecting baking soda powder into the dry-process deacidification tower to absorb acid gas in flue gas; the SCR denitration bag type dust collector comprises a dust collector body and an SCR denitration filter bag arranged in the dust collector body; the outermost layer of the SCR denitration filter bag is an expanded polytetrafluoroethylene film, and the inner layer of the SCR denitration filter bag is a composite catalytic felt loaded with a catalyst. The flue gas temperature is fully utilized, additional heating is not needed, and operation energy consumption is remarkably reduced. And the waste incineration flue gas treatment device is convenient to transform and suitable for waste incineration flue gas treatment.

The utility model discloses an outerwear structure of anti -falling clothes, including outerwear body (1), outerwear body (1) front side is equipped with safety zipper (2), and safety zipper (2) both sides are equipped with safety buckle (3), and outerwear body (1) back side is equipped with the vertical strip -shaped opening (4) of setting, and outerwear body (1) front and back two sides are equipped with the head -tail joint reflection strip (5), outerwear body (1) includes base layer (1.1), and the outer side of base layer (1.1) is equipped with the expanded polytetrafluoroethylene film layer (1.3), and the outer side of expanded polytetrafluoroethylene film layer (1.3) is equipped with the air -permeable layer (1.5), and the outer side of air -permeable layer (1.5) is equipped with wear -resisting layer (1.4), and the inner side of base layer (1.1) is equipped with the adhering layer (1.2). It can reduce the wear and tear of anti -falling clothes outerwear, and convenient and clean.

The invention discloses a preparation method of an expanded polytetrafluoroethylene (ePTFE) small-caliber artificial blood vessel based on directly grafted heparin of polydopamine nanoparticles. The method comprises the following steps: performing plasma treatment on a cleaned ePTFE small-caliber artificial blood vessel, grafting PDA-NPs on the treated artificial blood vessel, activating heparin by using EDCHCl and NHS, and reacting the ePTFE / PDA / HEP small-caliber artificial blood vessel grafted with the PDA-NPs with an activated heparin solution to obtain the heparin-grafted ePTFE / PDA / HEP small-caliber artificial blood vessel. And finally, washing and freeze-drying to obtain the artificial blood vessel. By utilizing the synergistic effect of plasma treatment and PDA-NPs modification, the loading capacity and stability of heparin are remarkably improved, the prepared artificial blood vessel has excellent anti-platelet adhesion performance, extremely low hemolysis rate and good biocompatibility, no toxic coupling agent needs to be added in the whole process, the safety is high, the process is stable, and the preparation method is suitable for industrial production. The method has a wide application prospect in the field of clinical transformation of small-caliber artificial blood vessels.

A type of under-eye implant includes two mirror-symmetrical implant units. Each implant unit is arc-shaped, tapering at both ends and thickening in the middle along its length. All edges and surfaces are smoothly transitioned through rounded surfaces. The arc trajectory of the implant unit matches the natural contour of the lower eyelid from the inner corner to the outer corner, with the radius of curvature of the inner segment near the inner corner being larger than that of the outer segment near the outer corner. Each implant unit has a through-hole at each end. The implant is made of expanded polytetrafluoroethylene (ePTFE), whose microporous structure induces tissue cell ingrowth after implantation, preventing implant displacement and light transmission, and demonstrating good biocompatibility.

The invention belongs to the technical field of functional polymer membrane materials, and discloses a method for improving the mechanical stability of an anion exchange membrane. According to the method, two-way stretched porous polytetrafluoroethylene is used as a supporting and reinforcing framework, interface compounding of polytetrafluoroethylene fibers and anion exchange resin is improved, and from OH <-> ion conduction, water diffusion and interface failure of a composite membrane, quaternization modification is carried out on perfluorinated sulfonic acid resin, so that the composite membrane is obtained. Performing impregnation regulation on the interface of the expanded polytetrafluoroethylene film; performing impregnation by using solvents with different proportions to regulate the shrinkage stress of the polytetrafluoroethylene microporous film; and adding a surfactant into anion exchange resin to enhance the wettability of the solution. The preparation of the perfluoro-structure composite reinforced membrane is realized, the mechanical stability of the anion exchange membrane for water electrolysis in a high-temperature and alkali application environment is effectively improved, and the service life of the anion exchange membrane in an alkaline electrolytic bath is prolonged.

The utility model discloses a waste incineration flue gas treatment device which comprises a waste incinerator, a waste heat boiler, a baking soda dry deacidification flue, an SCR denitration bag type dust collector, a waste heat utilization device, an induced draft fan and a chimney which are sequentially arranged in the flowing direction of flue gas. An SNCR system is arranged on the garbage incinerator, an ejector of the SNCR system sprays a denitration agent into the garbage incinerator, and the denitration agent reacts with NOx to be reduced into N2; the system is provided with a storage, preparation and injection system of baking soda dry powder and is used for injecting baking soda powder into the dry-process deacidification flue to absorb acid gas in flue gas; the SCR denitration bag type dust collector comprises a dust collector body and an SCR denitration filter bag arranged in the dust collector body; the outermost layer of the SCR denitration filter bag is an expanded polytetrafluoroethylene film, and the inner layer of the SCR denitration filter bag is a composite catalytic felt loaded with a catalyst. The flue gas temperature is fully utilized, additional heating is not needed, and operation energy consumption is remarkably reduced. And the method is suitable for waste incineration flue gas treatment.

The invention relates to an intervertebral disc fibrous ring tissue engineering repair material and application thereof, and aims to solve the problems of difficult fibrous ring repair, high recurrence rate, complicated operation and the like in the prior art. The repair material provided by the invention has excellent biocompatibility, superelasticity and shape memory effect, and can effectively promote regeneration and repair of the annulus fibrosus, significantly improve the surgical effect and reduce postoperative recurrence. The repairing material comprises one or more compounds of collagen, acellular matrix protein, gelatin polylactic acid and expanded polytetrafluoroethylene. The materials act together to support the growth of a plurality of cells such as chondrocytes, fibroblasts and mesenchymal stem cells, provide extremely high mechanical stability and biological activity, and are suitable for being used in a complex living body environment. Through specific chemical and physical treatment processes, the composite materials are assembled into the intervertebral disc fibrous ring tissue engineering repair material capable of supporting and repairing damaged intervertebral discs. The repair material and method provide a new solution for treatment of intervertebral disc degenerative diseases, and have wide application prospects and clinical values.

The invention discloses an expanded polytetrafluoroethylene functional membrane welding pipeline structure, which comprises a tubular main body formed by bending an ePTFE (expanded polytetrafluoroethylene) membrane; and the main body welding strip is formed by hot melting of a PFA tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer or an FEP fluorinated ethylene propylene copolymer, extends along the axial direction of the tubular main body, and is hermetically welded with the connector of the tubular main body. By means of the mode, a more efficient filtering effect can be provided, the ventilation flow of fresh air is allowed to be maximized, and the high-standard filtering requirement is met; the filter material has excellent environmental aging resistance, can adapt to humidity changes such as humid and cloudy and rainy weather, and ensures a stable filtering effect; the service life of the pipeline is long, and the requirement for frequent replacement is reduced, so that the overall cost is reduced; compared with a high-price ePTFE medical or filtering pipeline in a foreign monopoly market, the pipeline disclosed by the invention is relatively simple in manufacturing process, relatively low in cost and beneficial to breaking the market monopoly.

The application discloses a DMF chip, a rapid PCR system and a PCR method, and relates to the technical field of polymerase chain reaction. The DMF chip comprises a bottom plate, electrodes, a dielectric layer and a hydrophobic layer. The dielectric layer is arranged on the bottom plate with the electrodes fixed on one side of the bottom plate. The hydrophobic layer covers the surface of the dielectric layer. The dielectric layer is made of raw material polydimethylsiloxane. The hydrophobic layer is made of raw material expanded PTFE film. The DMF chip and the rapid PCR system are developed on the digital microfluidic platform based on dielectric wetting. The chip or the system improves the robustness of droplet movement at high temperature by adopting PDMS as the dielectric and expanded PTFE film as the hydrophobic layer. The PDMS can protect the electrodes in the high-temperature area above 90 DEG C from being broken down and will not hinder the shuttle movement of the droplets between the high-temperature area and the low-temperature area. The PCR reaction on the chip can be completed in 4 minutes through the above measures.

The utility model discloses a building external wall thermal insulation structure which comprises a modularized thermal insulation layer and a waterproof composite layer, the modularized thermal insulation layer comprises a plurality of thermal insulation base plates which are riveted with one another, each thermal insulation base plate is connected with an anchoring assembly, and the anchoring assemblies are used for being fixedly connected with a wall body; the waterproof composite layer comprises an expanded polytetrafluoroethylene layer, a gridding cloth layer and a coating layer, the expanded polytetrafluoroethylene layer is arranged on the outer wall of the modular heat preservation layer, and the gridding cloth layer is arranged on the expanded polytetrafluoroethylene layer; the coating layer is coated on the gridding cloth layer and permeates into pores of the gridding cloth layer to form an anti-crack layer. The problems of heat loss, structure damp and low construction efficiency can be solved.

This invention discloses a highly flexible flat cable for cleanroom and vacuum environments and its manufacturing method, comprising: several conductors, each conductor having an insulation layer formed by winding an expanded polytetrafluoroethylene (ePTFE) microporous film around its surface; the several conductors being arranged in parallel at a predetermined insulation spacing to form a wire group; the outer surface of the wire group being covered with an ePTFE microporous film outer layer; the insulation layer on the surface of each conductor and the ePTFE microporous film outer layer being hot-pressed and sintered together to form an integrated flat cable structure. Through this method, the integrated structure of this invention significantly improves the cable's mechanical strength, bending resistance, and long-term reliability, enabling it to withstand high-frequency, high-acceleration reciprocating motion; the overall weight of the cable is significantly reduced, achieving orderly wiring, while ensuring low signal attenuation and stable impedance during high-frequency signal transmission, thereby ensuring high signal integrity.

The invention belongs to the technical field of proton exchange membrane fuel cells, and particularly relates to a preparation method of an expanded polytetrafluoroethylene (ePTFE) reinforced fluorine-containing copolymer proton exchange membrane. According to the preparation method, ePTFE is taken as a reinforcing phase, in-situ polymerization is carried out on a perfluorovinyl sulfonyl fluoride monomer, fluoroolefin and a vinyl ether monomer, the polymer membrane is prepared through free radical polymerization reaction under the heating or illumination condition, and the polymer membrane subjected to hydrolytic acidification can be directly used as a proton exchange membrane. The method has the advantages of simplicity and convenience in operation, mild reaction conditions, low cost and the like, the prepared proton exchange membrane is good in mechanical property, high in proton conductivity and good in stability, and a new way is provided for synthesis of the proton exchange membrane.