9results about How to "Strong structural design" patented technology

The invention discloses a PRP combined carboxymethyl chitosan scaffold and a preparation method and application thereof, and belongs to the technical field of biomaterials.The preparation method comprises the following steps that carboxymethyl chitosan powder and hydroxyapatite powder are mixed, genipin powder is added, the mixture is mixed to be uniform, and a mixture is obtained; the preparation method comprises the following steps: unfreezing frozen PRP, and mixing the unfrozen PRP with ddH2O to obtain a mixed solution; adding the mixture into the mixed solution, uniformly stirring, and eliminating bubbles to obtain ink; and printing the ink by using a 3D printer, and then placing the ink in a CaCl2 solution for deformation treatment to obtain the PRP combined carboxymethyl chitosan scaffold. Through a 4D printing technology, PPR is changed into a part of printing ink in a stirring manner, and slow release of growth factors in PRP is realized by using a microporous structure of the stent and slow degradation of the stent.

The application discloses a fibrous nitrogen-doped carbon metal mesh composite membrane for water treatment, which utilizes a metal mesh as a base film and a metal source, uses amino acids as a nitrogen source and a carbon source, and forms a stable nitrogen-doped carbon layer through a calcination process and uniformly distributes the nitrogen-doped carbon layer on the surface of the metal mesh. The application utilizes abundant amino and carboxyl functional groups in amino acid molecules, forms a stable chemical chelate structure with metal ions of the metal mesh base through coordination bonding, and effectively enhances the interfacial bonding strength between the nitrogen-doped carbon and the metal mesh base film in the carbonization process through the bonding mechanism at the molecular level.

This invention discloses an inorganic multimetallic hydroxide@organic material core-shell structure explosion suppression material, belonging to the field of explosive safety protection technology. The explosion suppression material comprises a core layer and an outer shell layer; the core layer is an inorganic suppression phase with a multimetallic hydroxide framework and variable-valence metal centers, while the outer shell layer is an organic material shell layer with controllable softening temperature and thermal buffering capacity. The preparation method involves preparing multimetallic inorganic core layer powder using a co-precipitation method, and then coating the organic material onto the surface of the core particles using a melt-coating method. When applied to suppressing combustion and explosion accidents of solid propellants, the outer shell layer protects the particles from completely penetrating the flame layer and entering the combustion and explosion center region. Subsequently, it rapidly softens or destabilizes at high temperatures, releasing the core. Through multiple mechanisms such as heat absorption, capture of combustion free radicals, and formation of inert residue, it achieves rapid cooling and chemical suppression, effectively hindering combustion propagation and the transition from deflagration to detonation. Compared with existing explosion suppressants, this invention has a significant spatiotemporal synergistic explosion suppression effect and is suitable for the safety protection of high-energy solid propellants.

The invention provides a water-soluble engineering plastic reinforced cationic waterborne polyurethane material and a preparation method thereof, and belongs to the field of high-performance polyurethane materials. The preparation method comprises the following steps: firstly, mixing a water-soluble engineering plastic solution with a cationic waterborne polyurethane emulsion; secondly, adjusting the pH value of the solution until the system generates precipitate; and finally, carrying out precipitation treatment and hot-pressing film formation to obtain the waterborne polyurethane material. The water-soluble engineering plastic reinforced waterborne polyurethane material prepared by the invention has the characteristics of high strength, good ductility and good thermal stability, and can greatly meet the requirements of people on high-performance waterborne polyurethane materials; the breaking strength gt of the waterborne polyurethane material; the pressure is 45 MPa, and the tearing energy is gt; and 70 KJ m <-2 >. And the preparation method is simple and efficient, is easy to realize repeatedly and prepare on a large scale, and has a good industrial application prospect.

A cross-scale manufacturing method of a porous flexible piezoresistive sensor with a designable structure comprises the following steps: dispersing a conductive filler in a flexible polymer, and mixing the flexible polymer with water to form an emulsion for later use; preparing a soluble photosensitive resin mold, pouring paraffin, removing the soluble photosensitive resin to prepare a paraffin mold, pouring the prepared emulsion into the paraffin mold, removing the paraffin mold after the flexible polymer is cured, and generating micron-sized pores in the structured flexible polymer through high temperature; electrodes are manufactured on the two sides of the prepared structured porous flexible polymer, and the porous flexible piezoresistive sensor with the designable structure is obtained; the porous flexible piezoresistive sensor prepared by the invention has the characteristics of flexibility, light weight, hyperelasticity, high sensitivity, wide response range and the like, and the sensing performance and application scene adaptability of the flexible piezoresistive sensor as wearable equipment are greatly improved.

The invention discloses a high temperature resistant and infrared radiation resistant alumina fiber static sealing material and a preparation method thereof, belonging to the fields of sealing material technology and thermal protection material technology. Alumina twisted yarn is made by twisting alumina fiber and controlling the twist; alumina twisted yarn is made by plying multiple strands; alumina ceramic powder, sunscreen component, adhesive and diluent are stirred evenly to prepare a composite impregnation liquid; the composite impregnation liquid is used to impregnate and compound the alumina twisted yarn, and then dried to make an alumina composite wire; the alumina composite wire is used to weave the alumina fiber static sealing material. The material has the functions of high temperature resistance, infrared radiation resistance, sealing filling and heat insulation and heat resistance.

The invention discloses a mid-motor with an improved harmonic reducer, belongs to the technical field of motors, and mainly solves the problem that a harmonic reducer of an existing mid-motor is fixed in reduction ratio and cannot adapt to multiple working conditions. The motor comprises an end cover, a motor stator assembly, a motor rotor, a wave generator, a flexible gear, a rigid gear, an adjusting motor, a controller and the like, and is characterized in that the inner ring of a rigid gear ring is totally provided with 60 teeth, the number of fixed teeth and the number of telescopic teeth are equal, the fixed teeth and the telescopic teeth are alternately distributed, and the telescopic teeth are in transmission connection with a gear set through a rack bar; and the gear set is linked with an adjusting motor through a gear ring and a worm. When the adjusting motor is started, the telescopic teeth can be driven by the transmission link to stretch out and draw back in the tooth grooves, the meshing tooth number of the rigid gear and the flexible gear is changed, and therefore the reduction ratio of the harmonic reducer is flexibly adjusted. According to the invention, the motor outputs large torque during climbing and heavy load, the efficiency is improved during high-speed driving, the motor is suitable for various electric vehicles such as electric bicycles, the structure is stable, and the adaptability is high.

This invention discloses a graphene-coated silicon nanocomposite material, its preparation method, and its application, belonging to the field of battery materials technology. The preparation method of this composite material includes: firstly, removing the oxide layer on the surface of the silicon nanocomposite and performing plasma activation to obtain silicon nanocomposite with active sites and functional groups on the surface; dispersing it in a carbon source precursor solution, mixing it evenly, and then centrifuging and drying it at low temperature to obtain a silicon-coated precursor; under inert gas protection, carbonizing the silicon-coated precursor at 500-700℃ and simultaneously introducing it into a catalyst precursor, then introducing a carrier gas containing hydrogen and carbon, and heat-treating it at 800-950℃; finally, acid washing, water washing, and drying to obtain the target material. This invention achieves low-temperature controllable growth of graphene by optimizing process parameters. In the prepared core-shell composite material, 1-30 few-layer graphene shells are tightly bonded to the silicon nanocomposite core. When used as a negative electrode active material for lithium-ion batteries, it exhibits high specific capacity, excellent cycle stability, and rate performance. The process is easily scalable and has promising application prospects.