13 results about "Expanded PTFE" patented technology

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 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.

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 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.

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.

This invention discloses a method, apparatus, and application for preparing expanded polytetrafluoroethylene (ePTFE) membranes. The method includes preparing an ePTFE preform using a uniaxial stretching method; extruding the preform to obtain a base membrane with an inner wall pore size smaller than the outer wall pore size; immersing the base membrane in an aminoglucosyl solution until fully wetted, then removing it; removing the surface solution, immersing it in an acyl chloride solution, and heating it for reaction; subsequently immersing it in an aqueous solution of aminopolysaccharide quaternary ammonium salt, and allowing it to react fully at a certain temperature; washing and drying to obtain a modified ePTFE membrane. The preparation method of this invention results in an inner wall pore size smaller than the outer wall pore size, enabling the membrane to be used for internal pressure filtration, reducing internal wall fouling and energy consumption. Simultaneously, the membrane possesses good hydrophilicity and antibacterial properties, allowing for internal pressure filtration of oil-water emulsions.

The application provides a directional thrombolytic pro-endothelialization composite small-caliber artificial blood vessel and a preparation method thereof. The method activates and chemically modifies the surface of an expanded polytetrafluoroethylene (ePTFE) artificial blood vessel through plasma treatment, introduces active carboxyl groups and covalently grafts a pro-endothelial adhesion polypeptide REDV; then, by using the strong adhesion of a polydopamine (PDA) coating, nano-hydrogel particles loaded with thrombolytic drugs t-PANPs are fixed on the inner surface of the blood vessel. The application actively recruits endothelial cells by the bottom layer of the REDV polypeptide, and at the same time, realizes on-demand and controlled release of t-PA for thrombolysis by the upper layer of the nano-hydrogel, thereby solving the problems of easy thrombosis and intimal hyperplasia of the small-caliber artificial blood vessel. The preparation process condition is mild, the performance is stable, the synergistic effect of antithrombosis and pro-endothelialization is realized, and the application has a good clinical application prospect.

The utility model discloses a kind of expanded polytetrafluoroethylene functional membrane welded pipeline structures, comprising: tubular main body, by ePTFE expanded polytetrafluoroethylene film bending formation;Main body weld strip, by PFA tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer or FEP fluorinated ethylene propylene copolymer hot melt formation, along the axial extension of tubular main body, and with the interface seal welding of tubular main body. Through the above mode, the utility model can provide more efficient filtering effect, allow fresh air to ventilate flow maximization, satisfy high standard filtering demand;With excellent environmental aging resistance, can adapt to humidity change such as humid and rainy weather, ensure that filtering effect is stable;Pipeline long service life, reduce the demand of frequent replacement, thereby reduce overall cost;Compared with high-priced ePTFE medical or filtering pipeline of foreign monopoly market, the pipeline manufacturing process of the utility model is relatively simple, cost is lower, help to break market monopoly.

This invention discloses an expansion and stretching device for circular diameter expanded polytetrafluoroethylene (ePTFE) monofilament sutures used in medical surgery. The device includes an expansion heating device and a stretching heating device arranged sequentially, with a front air-cooling zone and a rear air-cooling zone between them. The expansion heating device includes a first heating cavity with first guide wheels on both sides and a first heating plate with guide grooves inside. The stretching heating device includes a second heating cavity with a second heating plate inside. This invention can manufacture medical ePTFE sutures with a diameter of 0.05-0.30 mm. The material has good chemical stability, is non-rejecting, does not breed bacteria, and is compatible with human tissues. Furthermore, it prevents suture splitting during use, reducing postoperative residue due to suture twisting, thus improving patient comfort and reducing the risk of bacterial infection.

The application relates to the technical field of medical devices, and provides a negative-pressure gas leakage resistant artificial blood vessel and a preparation method and application thereof. The negative-pressure gas leakage resistant artificial blood vessel is an expanded polytetrafluoroethylene artificial blood vessel provided with a thermoplastic polyurethane coating on the surface; compared with the expanded polytetrafluoroethylene artificial blood vessel, the negative-pressure gas leakage resistant artificial blood vessel has lower porosity. The thermoplastic polyurethane coating realizes continuous and dense coverage on the surface of the expanded polytetrafluoroethylene artificial blood vessel, effectively fills part of the micropore structure of the expanded polytetrafluoroethylene artificial blood vessel, the negative-pressure gas leakage resistant performance is significantly improved, the thermoplastic polyurethane coating has no cytotoxicity, has good biological safety, does not introduce additional hemolysis risk, and has good blood compatibility. The application provides a new technical selection for solving the problem of gas barrier integrity of a mechanical circulation support system pipeline, and is expected to be widely applied in the manufacturing of medical devices.