72 results about "Membrane porosity" patented technology

The invention belongs to the technical field of porous ceramic materials and their preparation and especially discloses a pure silicon carbide filtering membrane and a preparation method thereof. The pure silicon carbide filtering membrane has a high porosity, a low pressure drop, high strength, good thermal shock resistance and a high use temperature. The preparation method can be realized easily and can guarantee product performances. The pure silicon carbide filtering membrane comprises pure SiC, is a surface membrane layer obtained by pile-up and binding of fine SiC particles and has aperture sizes of 0.1 to 20 microns and membrane porosity of 25 to 50%. Fine SiC particles, silicon powder, a pore-forming additive and one or more organic resins as raw materials are prepared into a surface membrane layer by spraying or dipping and the surface membrane layer is dried and sintered to form the pure silicon carbide filtering membrane. The pure silicon carbide filtering membrane can be used in an oxidation atmosphere and in a reducing atmosphere, has strong acid corrosion and alkaline corrosion resistance, and can be used for various high / low temperature fluid filtering purification fields such as coal gasification chemical engineering, integrated gasification combined cycle (IGCC) and pressurized fluidized bed combustion (PFBC) coal gasification power generation, and high temperature flue gas, automobile exhaust and water purification.

The invention provides a method for preparing a lithium battery separator by coaxial electrospinning, belonging to the technical field of lithium battery separators. The lithium battery separator is a composite fiber membrane with a core / shell structure prepared by coaxial electrospinning technology. The core and shell layers of the composite fiber membrane are concentric, and the core layer is made of polyarylether sulfone ketone nanofibers with high melting point. Composition, the shell layer is composed of polyvinylidene fluoride nanofibers with low melting point, especially the coaxial composite film is hot-pressed at a certain temperature and pressure, and the shell layer fibers are micro-melted or melted to make the bonding between the fibers The tensile strength of the composite film in all directions is greatly improved. The lithium battery separator has a porosity of more than 75%, an electrolyte absorption rate of more than 550%, and can withstand high temperatures of 180°C. Therefore, the separator prepared by this method has good electrochemical properties and thermal and mechanical properties. And electric vehicles and other fields have high application value.