17results about How to "Controllable distribution" patented technology

The invention discloses a preparation method of ultra-high molecular weight polyethylene with consistent particle size distribution, which comprises the following steps: adding hexane into a first reaction kettle as a solvent, and adding a catalyst, raw materials ethylene and hydrogen into the first reaction kettle for prepolymerization reaction; after the pre-polymerization reaction, reaction slurry discharged from the first reaction kettle enters a second reaction kettle for polymerization reaction; and after polymerization is completed, reaction slurry discharged from the second reaction kettle is subjected to post-treatment, and a finished product is obtained. The catalyst comprises a main catalyst, a cocatalyst and an electron donor; the main catalyst is titanium tetrachloride doped with a magnesium compound; the cocatalyst is aluminum oxide loaded triethyl aluminum and / or diethyl aluminum chloride; the electron donor is a siloxane compound. According to the invention, through a prepolymerization process and catalyst optimization, high-quality ultra-high molecular weight polyethylene with super consistent particle size distribution is prepared.

The present invention discloses a microgel assembly material and a preparation method and application thereof. The raw materials for preparing the assembly material include microgels and a phenylboronic acid-modified polymer solution, and the phenylboronic acid-modified polymer solution penetrates between the microgels through the action of capillary force and forms a dynamic chemical bond with the microgels. The microgel assembly material in the present invention utilizes the synergistic effect of capillary penetration and dynamic chemical bonds to achieve rapid self-assembly of microgels, and has the characteristics of microporosity, injectability, self-healing, biocompatibility, and controllable distribution at the injection site, and has good application prospects.

A preparation method of a controllable CNTs@PyC interface layer in carbon / carbon composite material, ZIF-67 with different distribution patterns is carried on the surface of carbon fiber; CNTs are in-situ generated from ZIF-67 through chemical vapor deposition, CNTs are distributed on the surface of carbon fiber in different growth patterns; PyC is deposited on the surface of carbon fiber, different shapes of CNTs@PyC interface layer shape are obtained, by controlling the different growth patterns of ZIF-67 on the surface of carbon fiber, the different distribution states of CNTs derived exist, so as to realize the controllable and adjustable interface layer shape, to meet the application requirements under different conditions: the circular ring shape reduces the stress concentration of CNTs@PyC interface layer, avoids a large number of cracks in the composite material. The wave shape is beneficial to the application of carbon / carbon composite material in the service environment under the tensile condition, prolongs the crack propagation path along the interface layer, effectively relieves the PyC ring cracking phenomenon around the fiber, and is more easy to realize the interlocking effect between the interface layer and the carbon matrix, effectively prevents the interface debonding phenomenon, and greatly improves the mechanical properties of carbon / carbon composite material.

The application relates to a surface enhanced Raman scattering (SERS) substrate, a preparation method and application thereof, and belongs to the technical field of Raman spectrum detection. The substrate comprises, from bottom to top, a substrate layer, a distributed Bragg reflector, a chalcogen phase change material functional layer and a nanoscale metal structure layer. The distributed Bragg reflector is composed of a periodic structure stack of medium materials with different refractive indexes. The distributed Bragg reflector is coupled with the nanoscale metal structure layer to excite a Tamm state. The chalcogen phase change material functional layer can realize reversible regulation of amorphous state and crystalline state under external light excitation, changes the Tamm state resonance wavelength to regulate the SERS enhancement effect. The application realizes high-sensitivity detection through double enhancement of the Tamm state and localized surface plasmon resonance, has the characteristics of non-volatility, reconfigurability, high reproducibility and design flexibility, is convenient to operate, stable in performance, and is suitable for fields of chemical biological sensing, laboratory chip systems and optical encryption.

The utility model relates to the technical field of solid conveying control, and discloses an anti-blocking swing valve for an alternative fuel temporary storage bin, which comprises a temporary storage bin, a driving air cylinder is arranged at the front end of the bottom end of the temporary storage bin, a crank is arranged at the right end of the driving air cylinder, and a mounted bearing is arranged at the rear end of the crank. A valve plate is arranged at the ends, close to each other, of the mounted bearings, and a proximity switch is arranged at the front end of the temporary storage bin. The air cylinder drives the valve plate to swing left and right in the stock bin, most materials can directly fall into the underpants on one side and the feeding reamer on the lower portion of the valve plate along the valve plate, and a small number of strip-shaped materials can be hung on the upper portion of the valve plate but fall into the underpants on the other side along with movement of the valve plate. And the problem that the reamer is blocked due to material clotting is effectively solved. And meanwhile, due to the controllability of the material flow direction caused by the swing valve, the material quantity of the underpants on the left side and the right side can be consistent under the condition of one material, and the material is more uniformly distributed in the external furnace.

The invention discloses a solid-phase composite manufacturing device based on micro-macro wire feeding and a composite material manufacturing method.The solid-phase composite manufacturing device based on micro-macro wire feeding comprises a macro additive manufacturing module and a micro additive manufacturing module, and the macro additive manufacturing module comprises a first wire feeding mechanism and a first stirring head; a first spiral groove is formed in the periphery of one end of the first stirring head, the first wire feeding mechanism is used for conveying a base material towards the first spiral groove, the microscopic additive manufacturing module comprises a second wire feeding mechanism and a second stirring head, and the second stirring head is arranged in the first stirring head and can rotate relative to the first stirring head; a second spiral groove is formed in the periphery of the end, close to the first spiral groove, of the second stirring head. The second wire feeding mechanism is used for conveying reinforcing materials towards the second spiral groove. According to the solid-phase composite manufacturing device based on micro-macro wire feeding, the composite material with the reinforcing material distribution controllable can be manufactured, and the base material and the reinforcing material can be conveyed without shutdown.

The present invention proposes an MPCVD device and method for adjusting the position of a plasma ball online, the device comprises a bottom plate; a shell whose lower end face is fixed to the bottom plate, and an air hole is provided on the top; an inner cavity shell is used to generate a plasma ball and adjust the position of the plasma ball, which is located in the shell, and its lower end face is against the bottom plate and can move along the bottom plate, and the inner cavity shell, the shell and the bottom plate together form a sandwich space for gas flow, which comprises an upper cavity and a middle cavity connected in sequence; the lower cavity is used to feed microwaves into the middle cavity, which is located in the middle cavity and is surrounded by a circular quartz microwave window and a water-cooling platform; an outer cavity adjustment mechanism is used to adjust the position of the inner cavity shell in the shell, which is fixed to the outer wall of the shell, and its output end passes through the shell and is fixed to the inner cavity shell, and its output end can drive the inner cavity shell to move horizontally. The present invention can adjust the central position of the inner cavity at any time so that the plasma ball is located in the middle of the sample stage.

The present invention provides an electrospinning device for preparing a fiber membrane with uniform thickness, which belongs to the field of fuel cell technology and solves the problem in the prior art that the spinneret structure is easily blocked and affects production, and the thickness of the edge of the obtained electrospun fiber membrane is uneven. The device includes a high-voltage electrostatic generator, a solution storage device, an injection device arranged in an inclined array, a receiving device, and a controller. Among them, the output end of the high-voltage electrostatic generator is connected to the electrode of the injection device; the output end of the solution storage device is connected to the liquid supply port of the injection device; and the receiving device is grounded. The controller is used to establish a physical model of each needle solution advancement speed-spinning time-lateral thickness of a multi-needle electrospinning fiber membrane; and, taking the minimum unevenness of the fiber membrane thickness as the optimization target of the above physical model, solving to obtain the optimal solution advancement speed and optimal spinning time of each needle, and then adjusting the state of each needle at the next moment in real time to obtain a fiber membrane with uniform thickness.

The invention discloses a process and a method for preparing a nano material. Specifically, lithium iron phosphate, composite sodium iron phosphate and calcium carbonate are efficiently prepared by adopting a sol-gel method and a precipitation method respectively. When the lithium iron phosphate and the composite sodium iron phosphate are prepared, the reaction process is controllable by regulating and controlling the oscillation condition, the reaction temperature, the pH value and the retention time, and a target product is obtained after the gel is calcined. When calcium carbonate is prepared, nucleation and crystallization are enhanced by controlling the flow rates of a precursor, a precipitator and a surfactant and combining oscillation. According to the method, mixed mass transfer is enhanced by means of periodic oscillatory flow, local supersaturation and concentration gradient are inhibited, reactant deposition and channel blockage are reduced, continuous and stable production is guaranteed, meanwhile, the use amount and cost of a surfactant are reduced, and accurate regulation and control over the particle size, morphology and distribution of the material are achieved. Compared with a traditional process, the preparation period is greatly shortened, the product purity and the reaction efficiency are improved, and the method is suitable for industrial continuous production and has remarkable economic benefits and social benefits.

A bimodal polybutadiene and a molecular weight and microstructure controllable polymerization method and application thereof. The present invention belongs to the field of conjugated diene catalytic polymerization. The purpose of the present invention is to solve the technical problem that the molecular weight distribution of polybutadiene obtained by the existing method is single, which leads to a relatively single performance and cannot take into account excellent mechanical properties and processing performance. The method of the present invention: under anhydrous and oxygen-free conditions, an iron-based catalyst, an alkyl aluminum, butadiene, and a solvent are added to a reactor in any order, and the bimodal polybutadiene is obtained by constant temperature polymerization at 20 to 30°C. The content of trans-1,4 structure in the obtained polymer product is 45-83%, the number average molecular weight range of the low molecular weight part is 0.5-22 million g / mol, the molecular weight distribution is 1.0-2.2, and the number average molecular weight range of the high molecular weight part is 80-4.6 million, and the molecular weight distribution is 1.0-2.0.

The application belongs to the technical field of targeted drug delivery, and particularly relates to a nano-drug for recurrent abortion and a preparation method and application thereof. The nano-drug is prepared by loading baicalin into a transferrin-baitao exosome conjugate, the preparation method is simple, and the nano-drug shows good immunoregulation and anti-embryo resorption effects in an in-vitro immune inflammation model and an in-vivo recurrent abortion model. Safety testing shows that the nano-drug has good compatibility.

The application provides a multi-stimulus response shape memory polyurethane composite material and application thereof. The composite material comprises a shape memory polyurethane material and a nano-functional filler, and the nano-functional filler is uniformly embedded in the shape memory polyurethane material. The provided composite material can realize multi-stimulus response and has excellent performance.

The present application provides a dehydrogenation catalyst, a preparation method and application thereof, and a method for preparing ethylene by oxidatively dehydrogenating ethane and carbon dioxide, the catalyst comprising a carrier and a dehydrogenation active component supported on the carrier, the dehydrogenation active component comprising a first active component and a second active component, the first active component being iron, and the second active component being selected from one or more of cobalt, nickel, copper, zinc and palladium, and the dehydrogenation active component being concentratedly distributed on the surface of the carrier; and / or the reduction peak temperature of the dehydrogenation active component in a hydrogen temperature programmed reduction test is greater than the reduction peak temperature of a sample with a corresponding active component dispersion of 50%. The present application can change the distribution of the multi-metal active component on the surface of the carrier by controlling the synthesis conditions, and further adjust the selectivity of the catalyst to the oxidative dehydrogenation reaction of low-carbon alkanes.

The invention discloses a baking oven applied to copper-clad ceramic substrate production, and belongs to the technical field of baking ovens, the baking oven comprises a foundation bottom plate, four supporting legs are fixedly connected to the foundation bottom plate, an arc-shaped mounting plate is fixedly connected to the supporting legs, two channel steel supports are fixedly connected to the foundation bottom plate, and the arc-shaped mounting plate is fixedly connected to the channel steel supports. The two channel steel supports are fixedly connected with an ethanol steam generator and a linkage type water supply tank respectively. The spiral heating resistance wire and the heating unit are arranged in the baking furnace, heat source distribution is more uniform, it can be ensured that heat is effectively transmitted to all corners, the temperature difference between the center area and the edge area is minimized, airflow distribution in the baking furnace is more controllable by arranging the convection adjusting mechanism, and the baking efficiency is improved. The air flow can be more dispersedly and stably covered in the baking furnace, the cooling rate can be safely controlled by arranging the ethanol steam generator and the linkage type water supply tank, and meanwhile the cooling rate and the temperature uniformity can be guaranteed.

The present invention discloses a baking furnace applied to the production of copper-clad ceramic substrates, belonging to the technical field of baking furnaces, comprising a base plate, four legs fixedly connected to the base plate, an arc-shaped mounting plate fixedly connected to the legs, two channel steel brackets fixedly connected to the base plate, and an ethanol steam generator and a linkage water supply box fixedly connected to the two channel steel brackets. The present invention arranges a spiral heating resistor wire and a heating unit in the baking furnace, so that the heat source is distributed more evenly, which can ensure that the heat is effectively transferred to each corner, so that the temperature difference between the central area and the edge area is minimized, and by arranging a convection regulating mechanism, the airflow distribution in the baking furnace is more controllable, and the airflow can be more dispersed and stably covered in the baking furnace, and by arranging an ethanol steam generator and a linkage water supply box, the cooling rate can be controlled more safely, and the cooling rate and temperature uniformity can also be ensured.

The invention discloses a core-shell structure mineralizer modification-based photocuring 3D printing aluminum-based ceramic core and a preparation method thereof. The aluminum-based ceramic core comprises the following substances in percentage by weight: 65-75% of aluminum-based ceramic powder, 5-15% of a core-shell structure mineralizer component and 15-25% of a photosensitive resin component. The preparation method comprises the following steps: preparing aluminum-based ceramic core slurry, and vacuumizing the aluminum-based ceramic core slurry; injecting the aluminum-based ceramic core slurry into a trough of 3D printing equipment, and printing an aluminum-based ceramic core blank; the aluminum-based ceramic core green body is subjected to ultrasonic cleaning and drying treatment; and the aluminum-based ceramic core blank is subjected to degreasing treatment and sintering treatment, and the photocuring 3D printing aluminum-based ceramic core based on core-shell structure mineralizer modification is prepared. According to the method, the sintering temperature of the 3D printing aluminum-based ceramic core blank can be effectively adjusted, generation of interlayer cracks in the degreasing and sintering process is reduced, and the aluminum-based ceramic core with excellent comprehensive performance is obtained.

The present invention belongs to the field of semiconductor detection, and specifically relates to a solid-state Frisch gate device based on perovskite materials and a preparation method thereof. Based on the inherent defects of the existing virtual Frisch gate structure, the present invention proposes a solid-state Frisch gate device based on perovskite semiconductor materials. The specific preparation method includes methods such as direct growth using a solution method and mechanical processing. The weight potential field distribution of the device is greatly restricted at the position of the grid, indicating that the gate can play a good charge shielding effect. In addition, by comparing the weight potential distribution of different grids, it can be found that the solid-state Frisch gate structure used in the present invention can achieve a more uniform and near-ideal weight potential field distribution by adjusting the grid parameters. In addition, by further analyzing the signals of the anode, cathode, and gate of independent events, more accurate pulse rise time information and ray action position information can be obtained.