7results about How to "Maintain permeability" patented technology

In a separator for an aluminum electrolytic capacitor having a conductive polymer, short circuit resistance is improved. The constitution of an aluminum electrolytic capacitor separator for an aluminum electrolytic capacitor having a conductive polymer as a cathode material, which is sandwiched between a pair of electrodes, is characterized in that it contains synthetic fibers and a binder, and has a breaking strength of 40 to 180 kPa, a breaking resistance index of 3.5 to 7.5 kPa / (g / m 2 ).

The application discloses an impact self-cleaning sand prevention device, which comprises a coupling, a sand filter pipe, a variable-diameter piston assembly, a central pipe and an impact vibrator. The top end of the coupling is connected with a sucker rod string, the bottom end of the coupling is connected with the top end of the sand filter pipe, the bottom end of the sand filter pipe is connected with the top end of the central pipe, and the bottom end of the central pipe is connected with the top end of the impact vibrator. The variable-diameter piston assembly is connected to the outer wall of the central pipe. The impact self-cleaning sand prevention device can continuously and timely remove the blockage of the sand filter pipe during the extension and retraction of the sucker rod string in the upstroke and downstroke of the oil pump, so that the permeability of the sand filter pipe is maintained.

The application relates to the field of preparation of liquid flow battery electrode materials, and discloses a graphite felt electrode loaded with nano bismuth particles and a preparation method thereof. The method comprises the following steps: pretreating a graphite felt electrode to obtain a hydrophilic graphite felt electrode; immersing the hydrophilic graphite felt electrode into a solution containing bismuth ions, taking out and drying to obtain a graphite felt loaded with reduced bismuth precursor crystals; and treating the graphite felt loaded with the reduced bismuth precursor crystals by using plasma to obtain the graphite felt electrode loaded with nano bismuth particles. By using the plasma reduction technology, the bismuth ions adsorbed on the surface of the graphite felt fibers are directly reduced into nano bismuth metal particles. The method can avoid high temperature and a complex process flow in the traditional method, realizes a simple and efficient preparation process, and is suitable for large-scale electrode modification.

The application discloses an ion cage connected covalent organic framework compound and a preparation method and application thereof. The preparation method comprises the following steps: mixing an iron source, an oxime base derivative, a boric acid base derivative, a first solvent and a second solvent, and performing a liquid nitrogen freezing-pump air extraction-freezing cycle degassing treatment, then sealing and performing a condensation reaction to prepare a metal chelate connected covalent organic framework compound; and performing acid treatment on the metal chelate connected covalent organic framework compound to prepare the ion cage connected covalent organic framework compound. The preparation method provided by the application has the advantages of easy raw material, mild conditions, simple operation, and the like, and the prepared covalent organic framework compound has a clear cavity structure and a periodic arrangement of coordination sites, exhibits excellent chemical stability and regular channel characteristics, and has a wide application prospect in the fields of ion adsorption separation, heterogeneous catalysis and the like.

This utility model discloses an MMF filtration device for semiconductor water treatment, relating to the field of waste liquid treatment technology. Its key technical features include: a multi-media filter with an inlet pipe and an outlet pipe installed at its inlet and outlet, respectively. Both the inlet and outlet pipes are equipped with liquid pumps capable of forward and reverse flow. The inlet pipe is connected to a connecting pipe and a waste discharge pipe via a first three-way valve, and the outlet pipe is connected to a drain pipe and a cleaning pipe via a second three-way valve. The connecting pipe is connected to a container holding semiconductor waste liquid, and the cleaning pipe is connected to a tank containing cleaning fluid. This utility model, combined with MMF filtration technology, further enhances filtration capacity.

The application discloses a kind of water conservancy construction geotechnical sampling device and method, it is related to soil detection sampling technical field, including base, lifting mechanism, sampling execution mechanism;Sampling execution mechanism includes sampling column, drive assembly and inlay strip, sampling jaw;Drive assembly is used to drive sampling jaw swing;Inlay strip can be moved to outside relative to sampling jaw, to extrude soil at the edge of sampling jaw to outside displacement.The application in the process of jaw convergence, adjacent permanent magnet on inlay strip attract each other, drive inlay strip to move to outside.This action will be extruded soil at the edge of jaw to outside shear, displacement, so that disturbed soil is located at the outside of sampling jaw.Finally, the sample left in the inside of sampling jaw is substantially not subjected to lateral extrusion force, so as to maintain the original density, porosity and permeability of soil, ensure the reliability of detection data, reduce edge soil extrusion, maintain the physical properties of sample as is.