12results about How to "Process is easy to control" patented technology

The application provides a method for microwave-assisted preparation of tetragonal barium titanate powder, comprising the following steps: mixing a barium source and a titanium source to obtain a non-hydrolytic sol; performing a microwave-assisted gelation reaction on the non-hydrolytic sol to obtain a wet gel; drying the wet gel to obtain a dry gel; performing heat treatment on the dry gel in a protective atmosphere to obtain a pre-sintered powder; performing microwave-assisted calcination on the pre-sintered powder to obtain a calcined powder; and performing washing and drying on the calcined powder to obtain the barium titanate powder. The method provided by the application performs a microwave-assisted gelation reaction on a sol, and through the microwave effect in the two steps of gelation and calcination, the gelation time can be shortened and the calcination temperature can be reduced, and the synergistic regulation of high purity, ultra-fine particle size and high tetragonal phase content of the barium titanate powder is realized simultaneously. The method provided by the application is simple and controllable, low in energy consumption, suitable for industrial large-scale production, and the prepared barium titanate powder can be widely applied to the preparation of ceramic capacitors, and the reliability and miniaturization capability of the device are significantly improved.

This invention discloses an infrared camouflage composite yarn, its preparation method, and its application. The preparation process involves first preparing a preform, then dispersing aluminum powder and tin-doped indium oxide powder on a softened film to form an infrared-resistant film. The infrared-resistant film is then coated onto the preform using a layered structure design to prepare a composite preform. Combined with heat treatment, the yarn is then hot-stretched to obtain the improved infrared camouflage composite yarn. The infrared camouflage composite yarn prepared by this invention not only possesses excellent infrared camouflage capability and durability, but the addition of functional particles does not significantly affect the yarn's mechanical properties, such as breaking strength. The functional particles maintain uniform dispersion, improving the uniformity of infrared camouflage performance. This method is suitable for preparing infrared camouflage products, such as military jackets, tents, and backpacks.

The invention discloses a biomass-based electro-adsorption electrode material for heavy metal wastewater treatment as well as a preparation method and application of the biomass-based electro-adsorption electrode material. The preparation method comprises the following steps: (I) by taking wheat straw as a raw material, cooking the wheat straw with sodium sulfite for delignification pretreatment, and drying and grinding the wheat straw to obtain straw fiber powder; (II) adding NH4H2PO4 into the straw fiber powder to carry out NP co-doping, and carrying out high-temperature pyrolysis in an inert protective atmosphere to obtain a porous carbon active substance; and (III) mixing and homogenizing the porous carbon active substance, carbon black and PVDF in proportion, brushing on a current collector, and drying to obtain the electro-adsorption electrode material. The method is simple in process, green and efficient, the obtained electrode does not need chemical elution regeneration, secondary pollution is avoided, the adsorption capacity of heavy metals such as Pb < 2 + >, Cd < 2 + > and Cu < 2 + > is high, and the requirements of deep removal and resource recovery of heavy metal wastewater can be met.

This invention discloses a method for preparing an Au / Pt nanowire catalyst for ammonia oxidation. The method includes: firstly, dissolving chloroauric acid and 1-naphthol in a mixed solvent of ultrapure water and ethanol to obtain a golden solution; reacting the obtained golden solution under constant temperature conditions, and obtaining a black precipitate after centrifugation and washing; adding the black precipitate to n-hexane for ultrasonic dispersion, centrifuging and washing again, and then adding oleylamine and dodecylamine for ultrasonic treatment to obtain a black solution; adding hexadecyltrimethylammonium chloride, 1,2-butanediol, platinum acetylacetonate, and oleylamine to the black solution, and mixing evenly to obtain a light yellow solution; ultrasonicating the light yellow solution and reacting it under constant temperature conditions, followed by centrifugation and washing to obtain the black precipitate, which is the Au / Pt nanowire catalyst. This catalyst has a one-dimensional chain-like Au-supported structure with uniformly grown Pt-based nanodendrons on its surface, forming a typical epitaxial growth structure. This structure not only has high atomic utilization and excellent structural stability, but also abundant active sites and good electron transfer efficiency, which is beneficial to mass transfer and charge transfer during the ammonia oxidation reaction. The Au / Pt nanowire catalyst prepared by this invention not only has significant ammonia oxidation catalytic performance, but also has good stability, a controllable preparation process, and is easy to prepare on a large scale.

The invention discloses a tool and method for controlling the depth of a contaminated layer on the surface of titanium alloy, and the tool comprises a box body which is provided with an opening in the top and is used for accommodating a titanium alloy part to be treated; the top cover assembly is connected with the opening of the box body, the top cover assembly comprises a ceramic matrix composite one-way cover and a one-way exhaust valve, a plurality of vent holes are formed in the ceramic matrix composite one-way cover, and the one-way exhaust valve is installed at the vent holes; the sealing piece is arranged at the joint of the box body and the sealing cover assembly, and the sealing piece is an annular aerogel gasket; the internal bearing mechanism comprises a plurality of internal bearing assemblies, and the plurality of internal bearing assemblies are arranged in the box body; and the pre-vacuumizing valve is arranged on the box body. According to the method, the depth of the surface pollution layer of the titanium alloy subjected to heat treatment can be stably controlled within 0.05 mm and is obviously superior to the upper limit of 0.08 mm required by the existing industrial standard.

The invention discloses a precursor of a ternary positive electrode material, a preparation method of the precursor, the ternary positive electrode material and a battery, and belongs to the technical field of battery materials. The chemical general formula of the precursor is Ni < x > Co < y > Mn < z > (OH) < 2 >, and x is greater than or equal to 0.8 and less than or equal to 1, 0 lt; y is less than or equal to 0.1, 0lt; z < = 0.1, and x + y + z = 1; the profile of the precursor is in a sunflower shape. The positive electrode material obtained after the precursor is mixed with lithium and sintered is small in internal anisotropic stress, low in internal pore zigzag coefficient and short in ion transmission distance, and the petal-shaped shell is high in orderliness, so that the positive electrode material has an ordered and efficient de-intercalation channel, and the problem that the electrical property is degraded due to the fact that a high-nickel material is prone to deformation in electrochemical circulation is effectively solved; meanwhile, the material has a relatively high specific surface area, can be in more sufficient contact and more uniform mixing when being mixed and sintered with a lithium source to prepare a positive electrode material, and has higher reaction activity, so that the capacity and cycle performance of the obtained positive electrode active material can be remarkably improved.

The invention discloses a composite structure of a two-dimensional anisotropic material, and belongs to the technical field of thermal management materials, the composite structure comprises at least two external copper-clad layers, the outer side wall of each external copper-clad layer is sleeved with an internal two-dimensional anisotropic heat conduction layer, and the external copper-clad layers are stacked and compounded at a specific angle; the overall thermal conductivity of the external copper-clad layers tends to be balanced in multiple directions, the specific angle is 90 degrees, and the at least two external copper-clad layers are stacked and compounded after being sequentially rotated by 90 degrees; the at least two external copper-clad layers are stacked and compounded at a specific angle, so that the original two-dimensional anisotropic heat conduction directions of all the layers are mutually crossed and compensated, the limitation of a single-layer material in the heat conduction direction is effectively broken through, and the heat conduction performance of the composite structure in multiple directions tends to be balanced; and the heat conduction uniformity and the heat dissipation efficiency are obviously improved.

The invention discloses a method for green preparation of ammonium persulfate from sodium sulfate solid waste based on a membrane technology, and belongs to the technical field of sodium sulfate solid waste recycling, and the method comprises the following steps: S1, system assembly and electrolyte preparation: assembling a three-chamber electrolytic bath according to the sequence of an anode chamber, a cation exchange membrane, an intermediate chamber, a precise control membrane and a cathode chamber, preparing an anode chamber sulfuric acid electrolyte, an intermediate chamber sodium sulfate raw material solution and a cathode chamber ammonium bicarbonate initial solution; s2, starting the system and establishing a steady state: introducing ammonia gas into the cathode chamber and adjusting the flow of the ammonia gas to dynamically stabilize the pH value of the cathode chamber in a target interval of 9.0-9.5 so as to establish an NH4 < + > storage area in the cathode chamber; s3, continuous operation and dynamic material balance: after the system enters a steady state, extracting an anode chamber mixed solution, and extracting a part of cathode chamber mixed solution in a cathode chamber; supplementing materials in each chamber; s4, crystallizing and purifying ammonium persulfate; according to the invention, the technical problem of direct electro-synthesis of ammonium persulfate from sodium sulfate is solved through the innovation of a precise control membrane design and an ion migration strategy.

The application relates to the technical field of underwater engineering protection, in particular to a rigid framework-flexible filling collaborative scour protection body and a construction method and application thereof. The rigid framework-flexible filling collaborative scour protection body is constructed by using a homologous silt-based solidified soil material system, has close interface combination, high integrity, outstanding scour resistance, can effectively block secondary scouring, is suitable for complex marine hydrodynamic environments, and can meet the actual needs of offshore wind power, cross-sea bridges and other marine engineering structure foundation scour protection and repair. Meanwhile, the preparation method and the construction method of the rigid framework-flexible filling collaborative scour protection body are controllable, feasible, the raw materials are widely sourced and solid waste resource utilization is realized, green low-carbon benefits are remarkable, and the method is suitable for large-scale engineering application.

The application discloses a method for improving cementitious activity of waste glass powder by physical and chemical synergistic activation, and belongs to the field of building materials. The method aims to solve the problems of insufficient cementitious activity, low activation efficiency and unstable activation effect of waste glass powder. The method adopts a segmented feeding strategy to put waste glass and a chemical activator (any one of silica fume, nano-silicon dioxide, nano-titanium dioxide, calcite and alum) into a ball mill, adopts a four-stage matching grinding ball and a variable-speed intermittent process of "high-speed ball milling-stopping-moderate-speed ball milling", and significantly improves the cementitious activity of the waste glass powder through physical and chemical synergistic activation. The method has the characteristics of high activation efficiency, significant activity improvement and controllable process, and can be widely applied to resource utilization of waste glass powder.

The invention relates to a modified boron nitride multi-component heat-insulating composite material as well as a preparation method and application thereof, and belongs to the technical field of heat-insulating composite materials. The composite material comprises the following components in percentage by mass: 30-70% of paraffin, 5-40% of silane coupling agent modified boron nitride and 10-60% of titanium dioxide, the sum of the three components is 100%. The compatibility and dispersity of boron nitride and a paraffin matrix are fundamentally improved through surface modification, and the boron nitride and titanium dioxide cooperate to construct a multi-mechanism coupled slow ablation system, so that the corrosion inhibitor superior to a traditional titanium dioxide-paraffin corrosion inhibitor is obtained. According to the application of the material in slow ablation of the artillery barrel, through the synergistic effect of multiple mechanisms such as phase change heat absorption of paraffin, cold air film heat insulation, a TiO2 heat insulation layer and modified BN high-temperature solid lubrication, the overall ablation reduction performance is improved by 10% or above compared with that of a traditional titanium dioxide-paraffin corrosion inhibitor without BN; and the dispersity and macroscopic uniformity of the inorganic filler in the composite system are obviously improved.

The application discloses a 2,4-dichloro-5-isopropoxyphenylhydrazine hydrochloride continuous flow reaction system and belongs to the technical field of pesticide herbicide technical preparation. The system comprises a raw material feeding pretreatment unit for pretreating raw materials; a diazotization reaction unit connected with the raw material feeding pretreatment unit, a continuous liquid separation unit connected with the diazotization reaction unit; a reduction reaction unit connected with the continuous liquid separation unit and the raw material feeding pretreatment unit respectively; a solid-liquid separation unit connected with the reduction reaction unit; wherein the diazotization reaction unit and the reduction reaction unit are micro-channel reactors, and the units are sequentially connected through pipelines, forming a full-continuous production process from feeding to product centrifugation. The application realizes full-continuous production, significantly shortens the reaction time, improves the efficiency and safety, and enhances the product yield and selectivity.