11results about How to "Reduce Shrinkage Problems" patented technology

The utility model provides a concrete crack prevention curing device which comprises a roller, the two ends of the roller are rotationally connected with fixing shafts, and the side walls of the fixing shafts are fixedly connected with supporting rods. The top end of the supporting rod is rotationally connected with a spraying pipe, and a plurality of atomizing nozzles are mounted on the side wall of the spraying pipe; the top end of the supporting rod is in threaded connection with the screw rod, and the supporting rod abuts against the side wall of the spraying pipe; fixing rods are symmetrically arranged on the side wall of the supporting rod, and the bottom ends of the fixing rods are connected with a plastic cloth layer. The curing device for concrete crack prevention has the advantages that the plastic film is convenient to lay, and the interior of the plastic film is kept moist.

The utility model discloses a kind of drying setting devices, including drying mechanism, moving mechanism and rotating mechanism, drying mechanism is equipped with drying chamber, moving mechanism can enter and exit drying chamber, rotating mechanism includes driving part, clamping piece and first support, driving part is installed on moving mechanism, the output end of driving part is connected with clamping piece, and clamping piece can be driven to rotate, clamping piece can fix the one end of the cylinder body coated with carbon fiber, first support is movably installed on moving mechanism, and first support is used to support the other end of cylinder body. It solves the problem that the cylinder body coated with carbon fiber is directly placed in the drying oven for drying in the prior art, and uneven heating of carbon fiber is prone to occur.

The invention relates to the technical field of lithium ion batteries, in particular to a battery diaphragm, a preparation method of the battery diaphragm and a lithium ion battery, and the battery diaphragm comprises a flexible film substrate, and a ceramic coating and a polydopamine coating which are sequentially arranged on the surface of the film substrate from inside to outside. According to the technical scheme, the ceramic coating and the polydopamine coating are compounded on the membrane substrate, so that the electrolyte affinity and the thermal stability of the battery diaphragm can be effectively improved, and the electrochemical performance and the use safety of a battery can be improved.

The present application relates to the technical field of 3D printing concrete, and discloses a preparation method of 3D printing concrete mixed with plant fibers, which comprises the following steps: step 1, soaking and drying the plant fibers treated with water glass in saturated limewater; step 2, blending the plant fibers with sulphoaluminate cement; step 3, preparing alkali-activated 3D printing concrete and pumping it by taking 30-50 parts of water glass, 20-40 parts of sodium hydroxide, 100-200 parts of limestone powder, 1000-1200 parts of sand, 100-200 parts of extra-fine sand, 400-500 parts of mineral powder, 50-150 parts of rice husk ash, 20-40 parts of hydroxypropyl methyl cellulose, 220-300 parts of water and 5-10 parts of water reducing agent according to mass fraction; step 4, forcibly stirring the concrete and adding the product obtained in step 2; and step 5, printing the concrete and spraying a setting agent between the concrete layers. The present application helps to improve the constructability of 3D printing concrete and reduce its shrinkage.

This application relates to the field of activated carbon fiber technology, specifically disclosing a method for preparing highly adsorbent activated carbon fibers. This application uses oxidized modified viscose fiber as a precursor, which is then activated by plasma and subsequently seeded with nanocrystals to form a carbon-silicon composite intermediate. After carbonization, the silica is removed by hydrofluoric acid etching, resulting in a relatively continuous hierarchical porous structure. Plasma post-treatment is then used to adjust the surface properties of the activated carbon fiber surface and the pores. Compared to activated carbon fibers prepared using conventional phosphoric acid activation methods currently available on the market, the activated carbon fibers obtained in this application improve the mass transfer efficiency of macromolecular pollutants through their hierarchical porous structure. Furthermore, the pores, after plasma post-treatment, can fully utilize their adsorption and binding capacity for polycyclic aromatic hydrocarbons (PAHs). Therefore, the activated carbon fibers obtained in this application have a higher adsorption capacity for PAHs.

This invention relates to a multipath adaptive full-focus ultrasound imaging method for corner areas of composite materials. The method includes: acquiring full-matrix ultrasound data of the corner area of ​​the composite material; constructing a quasi-P-wave group velocity sound velocity model based on the characteristic parameters of the composite material; constructing a surface-layered discrete model with a local coordinate system, and abstracting it into a directed graph G based on the quasi-P-wave group velocity sound velocity model; searching for a set of candidate propagation paths from array elements to arbitrary nodes in the directed graph G, and constructing multiple full-focus imaging TFM images based on the candidate propagation paths and the full-matrix ultrasound data; calculating path score factors based on the multiple full-focus imaging TFM images, and performing pixel-by-pixel weighted fusion of the multiple full-focus imaging TFM images based on the path score factors to obtain a fused imaging result. Compared with existing technologies, this invention has advantages such as strong adaptability and improved focusing stability and imaging reliability in corner areas.

The application relates to a preparation method of a high-reliability MLCC, and belongs to the technical field of electronic ceramic original devices. The MLCC after glue removal is subjected to heat treatment, the inner electrode layer is partially oxidized, and then sintering is performed; the oxidation layer on the surface of the inner electrode can improve the sintering shrinkage temperature, delays the shrinkage of the inner electrode layer, and through limiting the temperature and holding time and other parameters in the heat treatment process, the continuity and flatness of the inner electrode layer are improved, and the product performance of the MLCC is improved; the method does not need to modify the MLCC raw materials and manufacturing equipment, and can realize higher capacity and pressure resistance of the MLCC product by adopting a traditional sintering mode, and has a wide application prospect in the preparation of electronic materials.

The application belongs to the technical field of silicon carbide ceramic preparation, and particularly relates to a silicon carbide ceramic slurry based on DIW-3D printing, a silicon carbide ceramic product and a preparation method. The silicon carbide ceramic slurry is prepared from raw materials including the following components and weight contents: silicon carbide mixed powder 60-100 parts, thermosetting resin 10-40 parts, dispersing agent 5-15 parts and thermal initiator 0.01-1 part. The application realizes the application of DIW-3D printing in the preparation of silicon carbide ceramic through the synergistic effect of double-particle-size SiC grading, introduction of B4C sintering aid, special resin and dispersant system, thermal initiation and solidification, DIW rheological design and gas pressure sintering, saves the material cost in the manufacturing process, prepares a silicon carbide sample with excellent mechanical properties, and further widens the development of silicon carbide ceramic.

The utility model relates to the technical field of injection molding, and discloses an injection mold structure for umbrella-rib-shaped products made of PP (polypropylene) materials, which comprises a lower mold and an upper mold arranged on the right side of the lower mold. According to the injection mold structure for the umbrella-rib-shaped product made of the PP material, a segmented injection technology is adopted, two groups of hot runners are arranged in each group of independent cavities, the injection process is divided into a plurality of stages, the injection speed and pressure are adjusted according to filling requirements of different areas, uniform flowing of the PP material in a complex umbrella rib structure can be ensured, and the production efficiency is improved. A plurality of small runners are arranged in the mold, and particularly the tiny runner design is adopted at the detail part of the umbrella rib, so that the PP material can uniformly flow in a complex cavity, and the phenomenon of unsmooth flow or incomplete injection molding is avoided; the problems that a traditional mold is poor in fluidity, incomplete in filling, long in forming period and prone to buckling deformation in the injection molding process are solved.

This invention proposes a low-shrinkage photocurable elastic resin composition based on synergistic compensation and its application. The resin composition has low viscosity and excellent photocurable printing properties. During molding, the non-reactive diluent is volatilized first by a simple stepwise heating of the printed model, and then the temperature is raised to the foaming temperature to cause the thermally expanding microspheres to expand and foam. At this temperature, the chain extender is further condensed. Through the synergistic effect of the non-reactive volatile diluent and the thermally expanding microspheres, physical compensation for curing shrinkage is achieved, which can meet the requirements of both low shrinkage and high elasticity. The method is simple and easy to implement and suitable for industrial applications.

The application discloses a kind of conformal heat-conducting insulating composite material and its preparation method and application method, it is related to semiconductor packaging and thermal management technical field.The composite material includes: organic polysilazane resin 40-60 parts, toughening agent 4-10 parts, crosslinking agent 0.1-3 parts, low dielectric heat-conducting filler 35-85 parts, heat-conducting filler dispersant 0.3-2 parts, low volume shrinkage modifier 5-10 parts, catalyst 0.1-1 part, polymerization inhibitor 0.01-0.06 parts, solvent 5-90 parts;Wherein low dielectric heat-conducting filler is hexagonal boron nitride nanosheet, spherical silicon powder and the complex of undefined aluminum nitride, low volume shrinkage modifier is cage-type silsesquioxane.The composite material of the application can perfectly fill micron chip gap, volume shrinkage rate is low after solidification, interface thermal resistance is small, has excellent temperature resistance and high insulation, can satisfy the requirement of high-end equipment manufacturing field such as aerospace, high-performance computing to thermal management material.