30results about How to "Huge potential application prospects" patented technology

The invention relates to a grain boundary diffusion method for improving properties of sintered NdFeB magnets. The grain boundary diffusion method comprises the following steps of stacking sintered NdFeB magnets and diffusion alloy sheets together and placing in a hot-pressing furnace; vacuumizing the hot-pressing furnace until the vacuum degree reaches a set value, heating the hot-pressing furnace, and when the temperature of the hot-pressing furnace reaches a set value, beginning to exert a pressure and maintaining the pressure and putting the diffused sample into a high-vacuum furnace for annealing, wherein the diffusion alloy sheets are low-melting-point eutectic diffusion alloys and are represented by R-TM, R is one or more of Sc, Y, La, Ce, Pr or Nd and TM is one or more of Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn. Compared with the prior art, the sintered NdFeB magnets modified by the pressure diffusion method, which is provided by the invention, have the advantages of large diffusion depth of a diffusion agent, uniform distribution of grain boundary phases, high coercivity and the like, especially, low-melting-point diffusion alloys designed by the invention are free of expensive heavy rare earth element dysprosium and thus the cost of the raw materials is relatively low, the diffusion temperature is low and the energy consumption in the diffusion process is small.

The invention provides a lac wax nano emulsion and a preparation method thereof. The lac wax emulsion comprises lac wax, Tween-80, Span-80, triethanolamine and water. The preparation method comprises the following steps: 1) evenly mixing the Tween-80, Span-80 and triethanolamine to obtain a compound emulsifying agent; 2) adding the compound emulsifying agent to the molten lac wax, and evenly stirring; and 3) adding water, and stirring to obtain the lac wax emulsion. The lac wax emulsion provided by the invention has a small particle diameter, and the dispersibility, storage stability, centrifugal stability and freezing and thawing stability are satisfactory and can meet the Level 1 national standards. The preparation method of the emulsion is simple, and is suitable for large-scale popularization and application.

The invention relates to a method for identifying a white spirit flavor type by using an electronic tongue system. The method comprises the following steps that firstly, the electronic tongue system is established, wherein the electronic tongue system comprises an array sensor and a detection system; then white spirit array difference diagrams of known flavor types are obtained by the electronic tongue system, wherein the white spirit array difference diagrams of white spirit with the same flavor type are used as a white spirit standard flavor type database; and finally a detection array difference diagram of a white spirit sample to be detected is obtained by the electronic tongue system and one array difference diagram matched with the array difference diagram of the white spirit sample to be detected is found so that the flavor type of the white spirit sample to be detected is as the same as that of a standard sample corresponding to the matched array difference diagram. According to the method for identifying the white spirit flavor type by using the electronic tongue system, the change of colors of the array sensor can be directly observed; the array difference diagrams only need to be compared in the detection process and the detection is simple, convenient and rapid; furthermore, components of selected sensing substances are common chemical substances and the cost is very low.

The invention discloses a photochromic ternary copolyester as well as a preparation method and application thereof. The photochromic ternary copolyester has the following structure: R m and R n Selected from H, F, Cl, Br, I, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, nitro, methoxy, etc., m is an integer of 1 to 4, n is An integer from 5 to 8, R a It is a residue of fatty dibasic acid, p is 20-200, q is 20-200, and x is an integer of 2-10. The preparation method comprises: preparing photochromic ternary copolyester through copolymerization of aliphatic dibasic acid compound or its esterified product, azobenzene compound and other diols. The photochromic ternary copolyester of the present invention has a photochromic response speed of less than 20 seconds and has good biodegradability and mechanical properties. The material has potential applications.

The invention provides a complex window material and a preparation method thereof. The method includes the steps: preparing an aluminum oxynitride ceramic; heating vanadium pentoxide to be melted, pouring deionized water, and stirring and filtering the materials to obtain vanadium pentoxide sol; cleaning the aluminum oxynitride ceramic and performing hydrophilic treatment to hydroxylate the surface of the aluminum oxynitride ceramic; depositing the vanadium pentoxide sol on the surface of the aluminum oxynitride ceramic combined with hydroxy or coating the surface of the aluminum oxynitride ceramic combined with hydroxy with the vanadium pentoxide sol, drying the vanadium pentoxide sol, and performing annealing reduction in vacuum to obtain the complex window material with the surface of the aluminum oxynitride ceramic deposited / coated with a vanadium dioxide film. The complex window material comprises the transparent aluminum oxynitride ceramic and the vanadium dioxide film, wherein the transparent aluminum oxynitride ceramic serves as a substrate, and the surface of the transparent aluminum oxynitride ceramic is deposited / coated with the vanadium dioxide film. The preparation method is simple, and the complex window material displays remarkable tunable switching characteristics within infrared and terahertz ranges and has excellent phase transition properties and an effectiveswitch ratio.

The invention discloses a preparation method of a highly hydrophobic carbon fluoride nanotube / polyimide composite material, relates to the preparation method of the polyimide composite material, and aims to reduce high dielectric constant of pure polyimide, improve the mechanical properties, reduce the hygroscopicity in engineering application, improve the service life, and solve the problem that special application in electrical insulation and power electronics is limited. The method comprises the steps: firstly, preparing carbon fluoride nanotubes; and secondly, obtaining the highly hydrophobic carbon fluoride nanotube / polyimide composite material through an in-situ polymerization method. The highly hydrophobic carbon fluoride nanotube / polyimide composite material disclosed by the invention can be industrialized in amplification, has great potential application prospects in electrical insulation, power electronics and other fields in future, and has great significance to new application prospects of polyimide. The preparation method of the highly hydrophobic carbon fluoride nanotube / polyimide composite material can be obtained.

The invention discloses an acrylate-type poly-chain transfer agent as well as a preparation method and an application of the poly-chain transfer agent in the preparation of a columnar polymer brush. The acrylate-type poly-chain transfer agent is prepared by synthesizing a main chain containing bromine (or chlorine) functional groups by virtue of RAFT and then introducing disulfide ester functional fragments by virtue of a one-step method. The columnar polymer brush is synthesized from the obtained acrylate-type poly-chain transfer agent by adopting a synthesis strategy of 'grafting from main chain' through the RAFT method, homopolymer and block copolymer containing multifunctional branched monomers can be obtained, namely, a brush-shaped homopolymer and a copolymer are obtained. The main chain of the polymer molecular brush is a (meth) acrylate polymer and the side chain of the polymer molecular brush is polystyrene, poly(meth)acrylate and poly(meth)acrylamide or a copolymer thereof. By the preparation method, the tedious steps used in the synthesis of a complex chain transfer reagent are avoided, the pollution caused by the tedious steps is decreased, the synthesized columnar polymer brush has a controllable structure and the preparation method provides a more simple and efficient method to synthesize the functional columnar polymer brush.