12results about How to "Block through" patented technology

The invention provides a cast iron sand mold coating and a preparation method thereof, and relates to the field of casting sand mold coatings. The cast iron sand mold coating is composed of the following raw materials: a fireproof filler, a liquid carrier, a suspending agent, a binder and an auxiliary agent. The raw materials comprise, by weight, 65-70% of the fireproof filler, 19-25% of the liquid carrier, 2-4% of the suspending agent, 4.4-5.5% of the binder and 2.4-3% of the auxiliary agent; the refractory filler is composed of magnesia powder, zircon powder and graphite powder; the magnesia powder is composed of light magnesia powder and heavy magnesia powder. According to the cast iron sand mold coating and the preparation method thereof, the problems that an existing shielding type coating is thin in anti-sulfuration coating thickness, poor in anti-sulfuration coating stability, general in anti-sulfuration effect and large in gas forming amount can be effectively solved, poor spheroidization and casting defects of castings are effectively avoided, the production cost is reduced, and the stability of the castings is improved.

The invention provides a middle and far infrared broadband metamaterial absorber and a design method thereof. The middle and far infrared broadband metamaterial absorber comprises metamaterial absorption units which are arranged in a periodic array mode. The whole metamaterial absorption unit is square and comprises a top metal layer, a dielectric layer and a bottom metal layer from top to bottom in sequence. The top metal layer is attached to the upper surface of the dielectric layer and is formed by arranging eight metal sheets according to a certain arrangement mode, namely a circular metal sheet which is arranged at the central position of the upper surface of the dielectric layer, and the center of the circular metal sheet is aligned with the center of the upper surface of the dielectric layer; three annular metal sheets concentric with the circular metal sheet surround the periphery of the circular metal sheet, and gaps exist between the circular metal sheet and the annular metal sheet on the innermost layer and between the annular metal sheets on the adjacent layers from inside to outside. And the four metal square sheets with the same size are respectively arranged at four corners of the upper surface of the dielectric layer. The absorption bandwidth is greatly prolonged, and perfect absorption of a target wave band can be infinitely approached by adjusting geometric parameters of the absorber.

The invention relates to a super-hydrophobic nanofiber composite membrane with a gradient structure and a preparation method and application of the super-hydrophobic nanofiber composite membrane, the super-hydrophobic nanofiber composite membrane comprises a supporting layer and a gradient hydrophobic layer, and the gradient hydrophobic layer is made of zinc oxide nanowires. The nanofiber composite membrane has pollution resistance and high permeability, and has excellent cycle stability in practical application.

The invention discloses an environment-friendly stainless steel passivation liquid and a preparation method and application thereof. The invention firstly uses an epoxy silane coupling agent to treat nano silicon dioxide, and then grafts carboxymethyl chitosan on the surface of the nano silicon dioxide through the cross-linking effect of epoxy groups. The carboxymethyl chitosan has good film-forming performance and forms a film layer on the surface of a metal material. At the same time, hydroxyl groups and amino groups in the carboxymethyl chitosan can react chemically with epoxy groups in an epoxy resin, so that the film layer is more compact and prevents corrosive media from passing through the film layer, thereby improving the corrosion resistance of the metal material. Then, acrylamide and allyloxy polyoxyethylene ether are used to modify sepiolite powder, so that the sepiolite powder can be better dispersed in the epoxy resin. At the same time, the polymer contains amide groups, which can form chemical bonds with hydroxyl groups and amino groups in the carboxymethyl chitosan and epoxy groups in the epoxy resin, further enhancing the physical shielding effect and protecting the metal substrate.

The invention discloses a photocatalytic norbornadiene isomerization reaction device, and relates to the technical field of reaction devices, the photocatalytic norbornadiene isomerization reaction device comprises a transparent reactor, the lower end of the transparent reactor is fixedly provided with a chassis, the upper end of the transparent reactor is provided with a top cover, the transparent reactor is internally provided with a light source assembly, and the top cover is provided with a blanking assembly; the light source assembly comprises a first glass tank, and the mixing tank and the threaded conveying blade are connected with the stirring shaft through the first belt pulley, the second belt pulley and the belt body, so that the device can discharge raw materials while stirring the internal reaction raw materials, the raw materials are discharged when the stirring blade rotates, and the stirring effect is improved. According to the present invention, the newly added norbornadiene and the photocatalyst can be immediately mixed with the existing reaction mixture after entering the reaction device so as to easily maintain the uniformity of the concentration of the reactants and the catalyst in the reaction system, such that the reaction can be stably performed under the ideal condition.

The invention provides a biodegradable graphene / PBAT composite packaging bag and a preparation method thereof. The method comprises the following steps: S1, heating and calcining rice husks in an air furnace to obtain rice husk ash; s2, mixing the rice hull ash with potassium hydroxide, and reacting at 700-900 DEG C; s3, adding a product obtained in the step S2 into lime milk for full reaction, precipitating calcium carbonate among graphene, then filtering, cleaning to be neutral, and drying to obtain a calcium carbonate / graphene composite material; s4, blending the calcium carbonate / graphene composite material with a PBAT master batch, performing melt extrusion by using a double-screw extruder, performing air cooling, and performing pelletizing for standby application to obtain a calcium carbonate / graphene / PBAT composite master batch; and S5, preparing the full-biodegradable graphene-based PBAT film from the calcium carbonate / graphene / PBAT composite master batch by adopting a film blowing method, and then preparing the packaging bag.

The invention provides a display panel and a display device. The display panel comprises a driving substrate and a light-emitting carrier plate. The driving substrate comprises a silicon-based substrate and a driving circuit layer. The light-emitting carrier plate comprises a glass substrate, a light-emitting unit, a color-changing layer and a heating part. The color changing layer is arranged between the adjacent light emitting units, extends along a plane parallel to the glass substrate and is in contact with the edge of one side, close to the glass substrate, of each light emitting unit, and the orthographic projection of the color changing layer on the glass substrate covers the heating through hole in the glass substrate; and the heating part is filled in the heating through hole. When the temperature of the light-emitting unit is smaller than or equal to the threshold temperature, the color-changing layer has first transmissivity, and the heating part is used for heating under irradiation of light penetrating through the color-changing layer; when the temperature of the light-emitting unit is larger than the threshold temperature, the color-changing layer has second transmissivity smaller than the first transmissivity and is used for blocking light. The display panel can improve the influence of low temperature on the luminous efficiency of the luminous unit and reduce light leakage at the edge position of the luminous unit.

The utility model discloses a multilayer composite food packaging film, which relates to the technical field of packaging films and comprises a packaging film main body, a protective layer, a barrier layer, an adding layer and a contact layer are respectively arranged in the packaging film main body, the protective layer is arranged at the top of the barrier layer, the barrier layer is arranged at the top of the adding layer, and the adding layer is arranged at the top of the contact layer. An adhesive is arranged between every two of the protective layer, the barrier layer, the adding layer and the contact layer, and the interior of the protective layer is made of a high-density polyethylene material. According to the multi-layer composite food packaging film disclosed by the utility model, a plurality of functional layers are arranged in the packaging film main body and comprise the protective layer, the barrier layer, the adding layer and the contact layer, and the layers are tightly adhered by adopting the water-based adhesive; by adopting a multi-layer composite structure, multiple functions of physical protection, gas and moisture barrier, antibacterial protection, food safety and the like are realized, and the storage safety and freshness of food are effectively improved.

The invention discloses a membrane casting solution, a raw material composition, a mixed matrix membrane, a preparation method and a wastewater treatment method. The raw material composition of the membrane casting liquid comprises polysiloxane, a cross-linking agent, a solvent, modified polytetrafluoroethylene micropowder and a catalyst, the modified polytetrafluoroethylene micro powder comprises polytetrafluoroethylene micro powder and a silane coupling agent. The preparation method of the mixed matrix membrane comprises the following steps: enabling the raw material composition of the membrane casting solution to react to obtain the membrane casting solution, coating the surface of a base membrane with the membrane casting solution, and curing to obtain the mixed matrix membrane. The mixed matrix membrane can efficiently separate alcohol ether pollutants in the water-based paint waste liquid, compared with a pure PDMS membrane, the investment and operation cost can be greatly reduced, and energy conservation, emission reduction, cost reduction and efficiency improvement are further achieved.

The invention relates to the technical field of positioning instrument image processing, and discloses an image processing method of a positioning instrument, the method adopts an optical filter with an inner and outer ring structure to collect an infrared image, the inner ring is specially designed for a lens, and the outer ring filters an infrared lamp. According to the method, graying processing is carried out on an acquired infrared image, a Sobel operator is used for calculating horizontal and vertical gradients, and then the gradient amplitude and direction are determined. Through comparison with a set threshold value, edge pixel points of the object image are accurately identified, and finally a clear edge image is output. Compared with a traditional method, noise and miscellaneous points are effectively reduced through the inner-ring optical filter and the outer-ring optical filter, the image preprocessing step is simplified, and the calculation complexity is reduced. Meanwhile, due to the clear input image, the Sobel operator does not need to be additionally adjusted during gradient calculation, and the calculation process is further simplified.

This invention belongs to the technical field of chain plate compost turners, and discloses a tracked chain plate compost turner. It includes a base, a main body for turning materials, a tracked walking mechanism for driving the main body, and a lifting mechanism for controlling the angle of the main body. By incorporating a tracked walking mechanism, the main body of the chain plate compost turner can move freely without being restricted by the production site, allowing for adaptability to different locations. Through the inclusion of a crushing component, during the material turning process, the drive shaft of the main body drives a circular plate to rotate via a rotating column. The circular plate, via a T-shaped track, drives blades to reciprocate, continuously cutting and crushing the material. Since the distance between two adjacent scrapers is equal to the arc length between two adjacent grooves, the blades can cut and crush the material between each groove.

The invention discloses a modified lithium manganese iron phosphate positive electrode material and its precursor, preparation method and battery, belonging to the technical field of positive electrode materials. The modified lithium manganese iron phosphate precursor is obtained by coating the surface of the iron manganese phosphate precursor with iron phosphate doped with Sb. The conductivity of the material can be improved by coating the iron phosphate, and the Mn can be suppressed by doping Sb in the iron phosphate coating layer. 2+ The modified lithium manganese iron phosphate positive electrode material prepared from the modified lithium manganese iron phosphate precursor has a lower resistivity and a higher capacity retention rate. The preparation methods of the modified lithium manganese iron phosphate positive electrode material and its precursor are relatively simple and easy to operate.