9results about How to "Generate uniform" patented technology

This invention discloses a wide-interlayer-spacing molybdenum disulfide catalyst, its preparation method, and its application, belonging to the field of water electrolysis for hydrogen production energy conversion technology. The preparation method includes the following steps: preparing a molybdenum disulfide precursor solution using a molybdenum source and a sulfur source; then subjecting the molybdenum disulfide precursor solution to a hydrothermal reaction with a carbon-containing interlayer-spacing regulator; and obtaining the wide-interlayer-spacing molybdenum disulfide catalyst after centrifugation and washing. The carbon-containing interlayer-spacing regulator is used to insert into the interlayer of molybdenum disulfide during the hydrothermal reaction, increasing the interlayer spacing of the (002) crystal planes of the obtained molybdenum disulfide catalyst. The wide-interlayer-spacing molybdenum disulfide catalyst of this invention facilitates electrolyte penetration and hydrogen bubble release, effectively avoids active site blockage, enhances the intrinsic conductivity of the catalyst, accelerates internal charge transport, increases active sites for hydrogen evolution reaction, and improves the intrinsic hydrogen evolution catalytic activity of the catalyst.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a process for preparing nano calcium carbonate by a wet method. A process for preparing nano calcium carbonate by a wet method comprises the following steps: polymerizing N-isopropylacrylamide and vinyl imidazole to generate a copolymer, then adding the copolymer into a calcium hydroxide suspension to form a crystal nucleus, dispersing the crystal nucleus, introducing carbon dioxide gas to carry out carbonization reaction, introducing nitrogen after the reaction is completed, and carrying out vacuum drying to obtain the nano calcium carbonate. Recovering the copolymer to be neutral and desorbing from the crystal surface; and finally, carrying out centrifugal separation, collecting a solid product, and carrying out vacuum drying to obtain the nano calcium carbonate. The nano calcium carbonate prepared by the process is uniform in particle size and good in dispersity. No toxic or harmful auxiliary agent needs to be introduced in the nano calcium carbonate production process, and the production purity is high.

The application discloses a low-density corrosion-resistant thin-gauge high-aluminum medium-manganese steel, and chemical components and mass percentages of the low-density corrosion-resistant thin-gauge high-aluminum medium-manganese steel include the following: C: 0.1-0.4%, Mn: 3-12%, Al: 2-5%, and the balance of Fe and inevitable impurities. The application has the advantages that a stirring friction processing method is used to introduce a microstructure feature of a phase and a grain size in a matrix in a gradient distribution into the medium-manganese steel, so that the surface modification purpose is achieved, and then the corrosion resistance is effectively improved.

The utility model discloses a fruit and vegetable sectional type fermentation device, which relates to the technical field of fruit and vegetable processing, and comprises an upper cabin body, the top of the upper cabin body is fixedly communicated with a feed hopper, a main material turning assembly is arranged in the upper cabin body, a group of side material turning assemblies is arranged in the upper cabin body, and a lower cabin body is fixedly arranged at the bottom of the upper cabin body. A feeding port is formed in the top of the upper cabin body, a scraping assembly is arranged in the lower cabin body, a sucking pump is fixedly installed on the outer surface of the lower cabin body, and one end of the sucking pump fixedly communicates with an exhaust pipe. The main material turning assembly, the side material turning assembly, the suction pump, the suction pipe and the exhaust pipe are matched for use, so that a sectional treatment mode of aerobic fermentation, anaerobic fermentation and dynamic conveying in the same cabin is realized, and the defect that a traditional single-screw device cannot meet environmental requirements at different stages is overcome; further, the microbial activity can be improved, the fermentation period is shortened, uniform generation of flavor substances is ensured, and the consistency of fermentation products is improved.

The invention relates to the technical field of aluminum-based composite material preparation, in particular to a ceramic reinforced aluminum-based workpiece and a preparation method. The ceramic reinforced aluminum-based workpiece is prepared by the method. The method comprises the steps that a forming die is assembled and filled with aluminum-based composite powder; sintering the forming die filled with the aluminum-based composite powder in an inert atmosphere to obtain a sintered green body; performing die forging treatment on the sintered green body to obtain a prefabricated green body; and after the prefabricated blank is machined to the size of a finished product, the prefabricated blank is sequentially subjected to solution treatment and aging treatment, and the ceramic reinforced aluminum-based workpiece is obtained. By means of the method, the ceramic reinforced aluminum-based workpiece with the large length-diameter ratio can be prepared, and the problems that cracks are generated when a formed blank is not separated from the female die, and layering and fragmentation are generated in the demolding process are solved.

This invention discloses a CO2-cured concrete and its preparation method, belonging to the field of building materials technology. The concrete comprises the following raw materials: cement 350-380 kg / m³. 3 Coarse aggregate 1000-1100 kg / m³ 3 Water 100-110 kg / m³ 3 Fine aggregate 850-880 kg / m³ 3 Water-reducing agent 4-6 kg / m³ 3 The method involves incorporating a specially formulated CO2 adsorbent as a functional component into concrete raw materials. This adsorbent is pre-loaded with CO2. During the concrete forming and curing stage, the CO2 inside the adsorbent is slowly released, promoting carbonation from within. This synergistic internal and external curing mechanism overcomes the shortcomings of traditional single external carbonation, which easily leads to surface densification and hinders internal reactions, achieving uniform action and deep sequestration of CO2 within the concrete.

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 embodiment of the invention discloses an aerosol generating substrate section and an aerosol generating product, the aerosol generating substrate section comprises a flaky substrate, the aerosol generating substrate section is of a winding structure formed by winding the flaky substrate, and the flaky substrate can be heated to generate aerosol. The flaky substrate comprises a substrate layer and substrate strips, and the substrate strips are arranged on at least one side of the substrate layer in the thickness direction of the flaky substrate. According to the aerosol generating substrate section, a stable air channel can be formed by adjusting the size of the substrate strips, and therefore the stability of suction resistance is improved; and after the substrate strips are laid on the substrate layer, displacement caused by factors such as vibration in the transportation, storage or use process can be reduced, so that the suction resistance stability can be further improved. In addition, the matrix strip is a homogeneous system, so that aerosol can be continuously and uniformly generated.

The invention discloses a positive active material for a power battery and a production process thereof, the positive active material for the power battery comprises major materials and auxiliary additives, the major materials comprise 80-85% of lead powder; 4%-9% of sulfuric acid; 7.5%-11.5% of pure water; the auxiliary additive comprises the following components in percentage by weight: 0.1%-0.20% of graphite; 0.08%-0.12% of short fibers; 0.08% to 0.1% of antimony trioxide; 0.09% to 0.14% of stannous mono-sulphate; 0.3%-0.7% of glass fiber; and 0.2%-0.5% of lithium hydroxide. Medium-long glass fibers are arranged to construct a macroscopic framework to provide millimeter-level support, the overall deformation resistance of the lead plaster is effectively improved, microcosmic pores of the lead plaster are accurately filled with superfine short fibers, microcosmic bonding among particles is effectively enhanced, the superfine short fibers and the microcosmic pores are combined to form a continuous'micro-medium-macro 'three-level reinforced network, and the microcosmic bonding is effectively enhanced. The contradiction that traditional fibers are difficult to disperse if being long and weak in support if being short is solved, so that the bonding force between the adjusted lead paste and the grid is greatly improved, the falling rate of active substances is reduced, and the lead paste is more suitable for being used in a high-frequency vibration scene.