19 results about "Fibre dispersion" patented technology

1. Name of the design product: Fiber dispersion metering machine (for large-volume UHPC). 2. Use of the design product: It belongs to a concrete fiber dispersion device with automatic metering and feeding. 3. Design key points of the design product: Lies in the shape. 4. Picture or photo that best shows the design key points: Perspective view 1.

The present invention discloses a method for preparing a multilayer gradient absorbing material. The preparation method comprises the following steps: 1) preparing a quartz fiber dispersion; 2) preparing quartz fibers; 3) preparing a quartz fiber composite aerogel; 4) preparing a carbon fiber composite aerogel; and 5) assembling the material. The present invention proposes a green, convenient, and low-cost process for preparing a multilayer gradient absorbing material with excellent absorbing properties. Flexible quartz fiber aerogel, quartz fiber composite aerogel, and carbon fiber composite aerogel are prepared separately. By combining these materials, a gradient impedance design is achieved, thereby enhancing the material's absorbing properties. This solves the problem of poor absorbing performance of a single material or structure. The proposed method for preparing an ultra-light, flexible multilayer absorbing material has low production costs, short processing time, and strong operability, making it suitable for mass production. Importantly, this material exhibits excellent flexibility, electromagnetic wave absorption, and thermal insulation properties, and is expected to be used in various fields, including next-generation stealth aircraft and portable electronic devices.

The application provides a silk fibroin nanofiber composite film and a preparation method and application thereof. The preparation method comprises the following steps: preparing a self-supporting film with an ordered and continuous fiber network framework from a silk fibroin nanofiber dispersion liquid, wherein the fiber network framework serves as a reinforcing phase; contacting the self-supporting film with a solution containing a matrix phase and / or a functional phase, so that the matrix phase and / or the functional phase is filled into the fiber network framework of the self-supporting film to obtain a composite precursor film; and extruding the composite precursor film, or extruding and cross-linking the composite precursor film to obtain the silk fibroin nanofiber composite film. The method of the application adopts a time sequence separation strategy of 'first making a framework and then filling', and the self-assembly ordered structure of the silk fibroin nanofiber is completely reserved. The reinforcing phase, the matrix phase and the functional phase in the obtained composite film synergistically act, and the composite film has high mechanical strength, low swelling rate and functional integrability, and can be applied to the fields of implantable medical devices or biosensors.

A system and method for providing a plurality of fibers from a spinneret; subjecting the fibers to quench air; attenuating the fibers through a closed stretching unit; reducing a velocity of the plurality of fibers in a diffuser that is spaced apart from an exit of the closed stretching unit in a direction of travel of the fibers, the diffuser having opposed diverging sidewalls; and subjecting the fibers to an applied electrostatic charge before the fibers enter the diffuser, wherein the electrostatic charge is applied by one or more electrostatic charging units. In one aspect, the electrostatic charging units are configured to apply a relatively high current, such as greater than 1 mA.

The present invention discloses an ultralight, compressible covalent organic framework aerogel, a preparation method, and an application thereof. The method comprises: (1) electrospinning a DMF solution of a urea-based ligand and polyacrylonitrile to obtain a UL / PAN film, crushing and freeze-drying the UL / PAN fiber film to obtain a UL / PAN fiber; (2) dispersing the UL / PAN fiber in a (Diox / TMB mixed solution containing Tp, using acetic acid as a catalyst, to obtain a Tp-COFs / PAN wet gel; and (3) removing PAN by extraction, and after solvent exchange, freeze-drying or supercritical drying to obtain a Tp-COFs fiber aerogel. The Tp-COFs fiber aerogel prepared by the present invention has a large specific surface area, good crystallinity, ultra-low density, excellent mechanical properties, and ultra-high organic solvent adsorption capacity, and shows good prospects in the molding and practical application of COFs materials.

The method for manufacturing a fiber mat includes a step of dispersing fine fibers having thermoplasticity in a dispersion medium, and a step of matting the dispersed fine fibers on a support. The step of matting includes a step of forming a fiber mat (30) by picking up the fine fibers on the support, and a step of irradiating light to a first main surface (31) of the fiber mat (30) on the side opposite to the side on which the support is present. In the step of irradiating light to the first main surface (31) of the fiber mat (30), the fine fibers on the first main surface (31) side are fused.

The invention provides a full-automatic low-carbon UHPC mixing production line and a gradient fiber dispersion method, and relates to the technical field of ultra-high performance concrete production equipment.The production line comprises a raw material premixing bin, a fiber gradient dispersion tower, a planetary vacuum mixer and a low-temperature curing tunnel; dynamic correction of the aggregate proportion is achieved through the microwave drying module, the laser particle size analyzer and the AI proportioning system interface which are arranged in the raw material premixing bin, and the aggregate particle size data collected by the laser particle size analyzer in real time and the water content data collected by the microwave drying module are utilized by the AI proportioning system, and the aggregate proportion is obtained through a dynamic correction algorithm of the aggregate proportion. The aggregate proportioning precision is improved to + / -0.5% from + / -3% of traditional experience proportioning, meanwhile, the raw material utilization rate is improved by 6%, UHPC strength fluctuation caused by proportioning deviation is effectively avoided through the improvement, and the problems that traditional production line raw material proportioning depends on artificial experience and is poor in adaptability are solved.

The invention discloses a fiber dispersing and distributing device for a vertical shaft type planetary mixer, which comprises a support frame and a fiber dispersing sub-device, the fiber dispersing sub-device is arranged on the support frame, the fiber dispersing sub-device is used for carrying out multi-stage dispersing treatment on fiber materials, and a vibration mechanism is also arranged on the outer wall of the fiber dispersing sub-device; wherein the fiber dispersing sub-device comprises a first charging barrel, and an upper-layer grating and a lower-layer grating which are sequentially arranged along the flowing direction of a fiber material, and the aperture of the upper-layer grating is larger than that of the lower-layer grating; and the fiber cloth sub-device is also installed on the supporting frame, and a feeding port of the fiber cloth sub-device is communicated with an outlet of the fiber dispersion sub-device. Through the excitation of the vibration mechanism and the synergistic effect of the two stages of grids with different pore diameters, efficient crushing and graded screening of fiber materials are achieved, and the multiple requirements for characteristic adaptation of high-tensile grouting materials, uniform fiber dispersion and agglomeration prevention, offshore construction adaptation and no damage to the performance of the grouting materials can be met at the same time.

The utility model discloses a kind of fiber solidified soil preparation devices based on density adjustment and semi-suspension dispersion, including density adjustment and fiber dispersion system, dehydration system and mixing system sequentially arranged according to material conveying direction;Density adjustment and fiber dispersion system include density adjustment bin and support device, agitator and on-line densimeter are equipped in bin, on-line densimeter is connected with PLC controller signal, and PLC controller receives the signal of on-line densimeter and controls water inlet valve opening and closing;Density adjustment bin is connected with dehydration system by slurry pump, fiber slurry is handled into mud cake after dehydration system, then, it is sent into mixing system and solidified agent mixes again.By adjusting slurry density to be similar to fiber density, it fundamentally eliminates the density difference and surface tension that cause fiber to form group, so that fiber is easily dispersed in liquid environment, and creates favorable conditions for subsequent uniform mixing.

A calibration method of an analysis instrument (1) for analysing the direction of wood fibres of a piece of wood operating by detecting structured light scattering, wherein a calibration sample (3) is used having a working surface (5) and comprising fibres (17) which can be at least partly illuminated with structured light at the working surface, and wherein a detecting step is carried out, in which a detected trend of the fibres is detected, and a processing step is carried out in which said detected trend of the fibres is processed, and wherein moreover the calibration sample used has the working surface constituted of a composite material (13), which is an anisotropic light diffusion material and which comprises a matrix (15) and said fibres, which are dispersed in the matrix and which have a known trend of the fibres at the working surface.

The invention discloses a concrete mixing monitoring and fiber dispersibility evaluation method based on data fusion. According to the method, the scene adaptability and the evaluation accuracy of the whole monitoring method are remarkably improved by adaptively adjusting the contribution weight of the video dynamic flow value and the power fluctuation variance in the whole stirring period. According to the algorithm, feature weights are dynamically distributed innovatively according to the stirring process, a higher weight is given to a dynamic flow value reflecting macroscopic fluidity in the material mixing stage at the initial stirring stage, and the flow features of preliminary fusion of fibers and a matrix are mainly captured; and entering a stable period along with stirring, automatically transitioning to evaluation logic dominated by power fluctuation variance, and accurately identifying the microscopic stable state after the fibers are uniformly dispersed. The dynamic adjustment mechanism effectively solves the problem of evaluation deviation of traditional fixed weight fusion in different stirring stages, and further enhances the evaluation robustness under complex working conditions.

This utility model discloses a crack-resistant mortar fiber dispersion uniformity tester, comprising a tester body and a metal sample plate containing test specimens. The tester body is equipped with a positioning mechanism and a bending mechanism. The fixing mechanism includes a placement groove and a positioning structure, the positioning structure including a positioning roller one and a positioning roller two. The bending mechanism includes an arc-shaped bending component. The tester body also includes an adjustment mechanism, comprising a turntable and a drive motor. The tester body is equipped with a central control terminal. This utility model, by setting multiple sets of arc-shaped bending components with different curvatures on the turntable, allows for rapid switching by controlling the turntable rotation via the drive motor, meeting diverse testing needs. It can test crack-resistant mortars of different specifications and application scenarios, expanding the tester's applicability and solving the problem of limited testing scenarios in traditional testing methods. It is particularly suitable for scenarios requiring frequent switching of testing conditions or large-scale batch testing.

The present invention relates to the field of concrete fiber dispersion technology, and specifically to a multi-scale fiber dispersion device and working method. The method is as follows: fibers are divided into three scales: microscopic, mesoscopic, and macroscopic, and dispersed in their corresponding dispersion channels according to their respective characteristics. After the dispersion is completed, the opening and closing knobs are controlled to guide the fibers through the guide bin into the feed channel, and finally, a high-pressure blower is used to blow the dispersed fibers through the feed channel into the concrete mixer. The device of the present invention integrates microscopic, mesoscopic, and macroscopic fiber dispersion functions, has a simple structure, strong practicality, and is flexible and convenient to use. It is applicable to all fiber concretes, can achieve the maximum uniform distribution of fibers in concrete, and significantly improve the performance of fiber concrete.

The application provides a silk fibroin nanofiber composite film and a preparation method and application thereof. The preparation method comprises the following steps: preparing a self-supporting film with an ordered and continuous fiber network framework from a silk fibroin nanofiber dispersion liquid, wherein the fiber network framework serves as a reinforcing phase; contacting the self-supporting film with a solution containing a matrix phase and / or a functional phase, so that the matrix phase and / or the functional phase is filled into the fiber network framework of the self-supporting film to obtain a composite precursor film; and extruding the composite precursor film, or extruding and cross-linking the composite precursor film to obtain the silk fibroin nanofiber composite film. The method of the application adopts a time sequence separation strategy of 'first making a framework and then filling', and the self-assembly ordered structure of the silk fibroin nanofiber is completely reserved. The reinforcing phase, the matrix phase and the functional phase in the obtained composite film synergistically act, and the composite film has high mechanical strength, low swelling rate and functional integrability, and can be applied to the fields of implantable medical devices or biosensors.

The invention discloses conductive MOF (Metal Organic Framework) wave-absorbing aerogel with a fractal microstructure as well as a preparation method and application of the conductive MOF wave-absorbing aerogel, and belongs to the technical field of aerogel preparation. The preparation method provided by the invention comprises the following steps: carrying out deacetylation treatment on cellulose acetate fibers containing blocked isocyanate, and then preparing a fiber suspension; adding hexaaminotriphenylene hexahydrochloride and nickel salt into the fiber suspension, mixing and dissolving, adding alkali liquor, heating to 50-90 DEG C, stirring for a set time, and reacting in a sealed manner to obtain composite fibers; and dispersing the composite fiber in water, and sequentially performing freeze-shaping, freeze-drying and thermal crosslinking to obtain the composite fiber. The obtained conductive MOF wave-absorbing aerogel shows excellent electromagnetic wave absorption performance, the reflection loss can reach-61 dB at the frequency of 13.84 GHz, the optimal effective absorption bandwidth reaches 8 GHz or above, and the conductive MOF wave-absorbing aerogel has the characteristics of light weight and broadband absorption and has good application prospects in the field of electromagnetic wave absorption.

A support member including at least one first layer and a second layer that are stacked along a thickness direction of the support member. Each of the at least one first layer and the second layer includes a matrix and fibers. The fibers in the matrix are dispersed in the matrix. On a plane parallel to a surface of the support member, an angle α formed between an extending direction of the fiber in the first layer and an extending direction of the fiber in the second layer satisfies α>0°.

This invention provides a method and apparatus for characterizing and evaluating the uniformity of fiber pulp dispersion. The method includes: obtaining the actual dimensions of a pulping device and constructing a three-dimensional geometric model based on the actual dimensions; determining the flow physics model, boundary conditions, and initial conditions of the fluid within the three-dimensional geometric model based on the actual operating conditions of the pulping device; then performing flow field simulation to obtain flow field parameters; constructing filling units based on the actual operating conditions and determining the target size of the particles used to simulate fibers; the number of particles of the target size included in the filling unit is used to characterize the fiber concentration; performing simulation calculations based on the flow field parameters and the particles in the filling unit to obtain a converged solution; and extracting and analyzing the converged solution to obtain the coefficient of variation used to characterize the uniformity of fiber dispersion under actual operating conditions. The fiber pulp dispersion uniformity characterization and evaluation method provided by this solution is applicable to engineering-scale applications and is more universal and reliable.

The application discloses a high-strength composite fiber plugging system which is composed of flexible fiber, rigid fiber, suspended viscosity increasing agent, fiber dispersing agent and water. The application also discloses a preparation method of the high-strength composite fiber plugging system, and the steps are as follows: (1) adding formula amount of water into a container, then adding formula amount of flexible fiber, formula amount of rigid fiber and formula amount of fiber dispersing agent into the container in sequence, and mixing uniformly to obtain a mixed solution; (2) stirring the mixed solution obtained in the step (1) at a certain stirring speed, slowly adding formula amount of suspended viscosity increasing agent into the container while stirring, and then stirring uniformly. The application has the advantages of uniform dispersion time less than 120 minutes, viscosity less than 350 mPa·s, suspension stability time more than 1 day, plugging pressure gradient more than 10 MPa / m, plugging rate more than 95%, and thermal stability time of the system at 130 DEG C more than 6 months.