4results about How to "With large-scale production" patented technology

The invention discloses a nano porous nickel electrocatalyst material as well as a preparation method and application thereof. Belongs to the technical field of electrolyzed water hydrogen production catalysts. According to the method, a nickel net substrate is subjected to pretreatment, electrogalvanizing, high-temperature alloying and chemical dealloying, and finally the nano-porous nickel electrocatalyst material growing on the nickel net is obtained. The electrocatalyst material prepared by the method has a uniform three-dimensional nano porous structure, the thickness of a porous layer is 10-70 [mu] m, and the aperture is 100-500 nm. As an alkaline electrolytic water hydrogen evolution reaction cathode catalyst, the material has high specific surface area and rich active sites, and shows lower overpotential and excellent long-term stability. The method is simple in technological process, raw materials are easy to obtain, and the method has large-scale production potential and has wide application prospects in the field of hydrogen production through water electrolysis.

The invention discloses a Fe-doped K0. 5Mn4O8 nano crystal whisker material and a preparation method thereof, and belongs to the field of inorganic materials. The preparation method comprises the following steps: dissolving iron nitrate nonahydrate, urea, a manganous nitrate aqueous solution and potassium permanganate in purified water, and carrying out constant-temperature reaction in a hydrothermal reaction kettle; and filtering the reaction product, drying in a drying oven, calcining in a muffle furnace, and cooling to obtain the Fe-doped K0. 5Mn4O8 nano whisker material. According to the method, the electrochemical performance of the K0. 5Mn4O8 nano whisker material is improved through Fe doping, a one-dimensional nano whisker structure is observed microcosmically, part of whiskers are mutually wound to form a fluffy interwoven network, the specific surface area of the material is remarkably increased, rich active sites are provided, and interface charge transfer kinetics is accelerated. Due to optimization of the electronic structure of the material and the unique microstructure of the material by Fe doping, the material shows good electrochemical stability when being used as the positive electrode of the zinc ion battery.

This invention relates to a method for preparing recycled polyesteramide based on an ester-amide exchange reaction. The invention first involves ester-amide exchange of waste polyamide to obtain polyamide esters, then purifying the polyamide esters to remove color and impurities, and finally obtaining recycled polyesteramide through vacuum polycondensation and de-alcoholization. Compared with existing technologies, this invention eliminates the need to depolymerize waste polyamide into caprolactam monomers, resulting in lower energy consumption, relatively mild reaction conditions, and simple operation. It can be completed using conventional reaction equipment and has the potential for large-scale production. This invention achieves efficient recycling of waste polyamide and high-value-added regeneration of polyesteramide, providing technical support for the recycling of waste polyamide textiles.

The invention provides SiC-ZrC ceramic fiber aerogel with high flexibility and low thermal conductivity and a preparation method of the SiC-ZrC ceramic fiber aerogel, and relates to the field of aerogel materials. The method comprises the following steps: preparing a spinning solution containing a silicon precursor, a zirconium precursor and polyvinylpyrrolidone, and carrying out electrostatic spinning, pre-oxidation and heat treatment to finish ceramic treatment of SiC and ZrC fibers in one step, so as to prepare SiC-ZrC ceramic fiber aerogel with a three-dimensional fiber network structure; the diameter of fibers in the aerogel is nanoscale, and the microstructure comprises a SiC nanofiber matrix and ZrC nanoparticles which are uniformly distributed. The SiC-ZrC ceramic fiber aerogel integrating excellent mechanical property and heat insulation property is finally prepared by regulating and controlling the content of the zirconium precursor, spinning parameters and heat treatment parameters and accurately controlling the fiber morphology and aerogel performance; the method is simple in process, good in controllability, high in repeatability and suitable for large-scale production.