115results about How to "Valid package" patented technology

The invention discloses a preparation method and application of a microencapsulation modified efficient intumescent flame-retardant system.The preparation method specifically comprises the following steps that ammonium polyphosphate and an emulsifier are added into a silicon dioxide capsule material solution, an in-situ polymerization reaction is conducted, and the microencapsulation efficient flame-retardant system with ammonium polyphosphate as a core material and silicon dioxide as a capsule material is obtained; the microencapsulated ammonium polyphosphate is obtained; melamine cyanurate, calcium gluconate and prepared microencapsulated ammonium polyphosphate are compounded to form an intumescent flame retardant system; the application method comprises the following steps: adding the microencapsulated ammonium polyphosphate, the melamine cyanurate and the calcium gluconate according to a certain proportion, dissolving in the epoxy resin a glue, and uniformly stirring and dispersing. And adding epoxy resin b glue according to the mass ratio of a: b of 3: 1 to obtain the flame-retardant EP composite material. Ammonium polyphosphate is subjected to microcapsule wrapping modification, silicon dioxide is adopted as a capsule wall material, ammonium polyphosphate can be effectively wrapped, the compatibility of a base material is improved, and the flame retardant effect of the base material is further improved.

The invention relates to the field of marine food manufacturing, in particular to high-protein-content soy sauce and a preparation method thereof, and the high-protein-content soy sauce comprises the following raw materials: laminarin, modified anthocyanin, compound protein, docosahexaenoic acid, astaxanthin, taurine, carrageenan, beta-amylase, soybeans, salt and purified water. The laminarin, the modified anthocyanin and the compound protein play a role through a synergistic effect, the compound protein in the soy sauce is wrapped by the modified anthocyanin to form a compound, a laminarin film is tightly attached to the outer layer of the compound formed by the modified anthocyanin, and the wrapping capacity and the structural stability of the compound are further enhanced; meanwhile, the oxidation process of fat and protein in the soy sauce is slowed down, the modified anthocyanin and a laminarin film interact to maintain the protein content in the soy sauce, laminarin, the modified anthocyanin and compound protein form a dynamic balance system, the nutritional value and quality of the soy sauce are improved, and the soy sauce with high protein content is provided.

The utility model discloses 3d honeycomb packing paper and box packing paper thereof, and relates to the field of packing paper design, the 3d honeycomb packing paper comprises a plurality of paper strips, and the plurality of paper strips are arranged with the same length and the same width; a plurality of adhesive layers are arranged on the two sides of the paper strip respectively, the adhesive layers are arranged in an equidistant array mode, and the adhesive layers on the two sides of the paper strip are arranged in a staggered mode. When the multiple paper strips are stretched in the vertical direction of the side faces, the paper strips and the adhesive layers on the two sides are stretched to form a honeycomb-shaped structure. When the paper tape is stretched, the paper tape can be stretched and deformed from the adhesive layers which are arranged in a staggered mode, the paper tape can form a honeycomb-shaped structure after being completely stretched, and due to the fact that the honeycomb-shaped structure is high in stability, the paper tape can be stretched in the stretching direction and does not deform in other directions; compared with kraft paper, the paper strip is lower in preparation cost, the strength of the 3d honeycomb packaging paper can be guaranteed by setting the corresponding width of the paper strip, and the protection effect is better.

The invention relates to the technical field of batteries, and discloses a pole piece, an electrode assembly and an electrochemical device. A current collector of the pole piece comprises a supporting layer, and a first conductive layer and a second conductive layer which are arranged on two sides of the supporting layer, and the current collector comprises a first main body part and a first convex part; the active material layer is arranged on the first main body part; the first tab unit is locally welded on the first conductive layer of the first convex part through a first welding mark; the second tab unit is locally welded on the second conductive layer of the first convex part through a second welding mark; the insulating part is arranged on the first convex part and covers the first welding mark and the second welding mark, the width of the insulating part in the third direction is larger than that of the first tab unit, and the width of the insulating part in the third direction is larger than that of the second tab unit. And the insulating part can cover the first tab unit and the second tab unit in the third direction, so that short circuit in the pole piece caused by exposure of the first tab unit and the second tab unit due to heat shrinkage of the insulating part is avoided, and the safety performance of the electrochemical device is improved.

The invention discloses hectorite composite antibacterial and antioxidant hydrogel and a preparation method and application thereof.The preparation method comprises the steps that hectorite is dispersed in deionized water to obtain dispersion liquid, zwitterionic monomers are added, the dispersion liquid is adsorbed on the surface of hectorite through the interaction between ions, and a zwitterionic monomer-hectorite compound is prepared; adding the zwitterionic monomer-hectorite compound, a main monomer, a cross-linking agent, an initiator and a catalyst into water, fully stirring to obtain a precursor solution, and cross-linking and curing to obtain double-cross-linked hectorite composite hydrogel; the preparation method comprises the following steps: preparing a functional polymer deionized water solution, adding inorganic copper salt, carrying out ultrasonic dispersion, adding EGCG, carrying out a reaction, carrying out centrifugal separation on a final product, washing, and carrying out freeze drying to prepare an EGCG-Cu nano complex; and immersing the bi-crosslinked hectorite composite hydrogel into a deionized water solution of an EGCG-Cu nano complex to fully swell the hydrogel layer, taking out the hydrogel layer, and carrying out vacuum drying to obtain the EGCG-Cu nano hydrogel. The hydrogel material provided by the invention can realize the wound dressing with antibacterial and antioxidant properties at the same time.

The invention discloses humic acid-based coated slow-release potassium chloride and a preparation method thereof, and belongs to the technical field of biological slow-release organic and inorganic fertilizers. The fertilizer comprises the following raw materials in parts by weight: 40-55 parts of potassium chloride, 6-8 parts of humic acid, 6-9 parts of urea, 0.5-0.8 part of trace elements and 3.5-5.5 parts of a slow-release porous coating material. According to the invention, ethylenediamine and maleic anhydride are used as raw materials to prepare a functional monomer containing carboxyl and amino groups at the same time, an effective coating material enables the potassium fertilizer to release potassium ions in soil more slowly and uniformly, and the utilization efficiency of potassium is improved. The sustained-release potassium chloride disclosed by the invention has an extremely strong potassium chloride sustained-release effect on one hand, provides sufficient potassium for crops, and can effectively regulate the ecological activity of soil and improve the utilization rate of the potassium on the other hand.

The invention discloses a fast-assembled shared forming die frame, and belongs to the technical field of dies, the fast-assembled shared forming die frame comprises a lower die base and an upper die base movably arranged right above the lower die base, and six guide blocks distributed along the side edge of a die core are fixed to the corresponding faces of the lower die base and the upper die base correspondingly; according to the die, the six guide blocks distributed along the side edge of the die core and the six screws guide and position the die core from the front faces of the X-axis and the Y-axis and fix the die core from the Z-axis, the vibration absorption hole plate and the two filling blocks are turned over to fasten the die core from the outer side, meanwhile, the two grooves in the side edge of the die core are filled with the two filling blocks, and the die core is fixed through the two filling blocks. The lower mold core is effectively wrapped and reinforced from the outer side, the mold pushing pore plate turns over along with the vibration absorption pore plate and is fastened on the upper mold core on the surface of the lower mold core from the outer side, the two complementing blocks are clamped and filled in corresponding grooves in the side edges of the upper mold core, the position of the upper mold core is effectively adjusted, and the upper mold core and the lower mold core are rapidly combined in a butt joint mode.

The invention discloses a multi-layer steel structure connecting frame. The multi-layer steel structure connecting frame sequentially comprises a bottom-layer frame, a top-layer frame and at least one middle-layer frame between the bottom-layer frame and the top-layer frame from bottom to top. The frames comprise stand columns, and every two adjacent stand columns are connected through a cross beam. The adjacent frames are connected up and down through connecting assemblies; the connecting assembly comprises a first connecting piece and a second connecting piece. The first connecting piece comprises a first rectangular frame and a first sleeve. The second connecting piece comprises a second rectangular frame and a second sleeve, and the opening end of the second sleeve is opposite to the opening end of the first sleeve. The connecting rib is connected with the first connecting piece and the second connecting piece. The first connecting piece and the second connecting piece are connected in an anchoring mode through the mutual inserting design of the connecting ribs and the sleeves, so that the connecting ribs and grouting materials are combined more firmly, the strength and stability of the structural connecting portion are improved, and structural potential safety hazards caused by dislocation or looseness of the connecting ribs are avoided.

The present invention provides a multi-medium mixing device for an ultra-high voltage converter transformer, comprising a composite venturi tube and a mixing pipe connected in sequence, wherein the composite venturi tube comprises an inner venturi tube connected to a dry powder pipe and an outer venturi tube connected to a foam pipe, the inner venturi tube is nested in the outer venturi tube, the outer venturi tube is connected to the mixing pipe, and the outlet of the inner venturi tube is located before the outer throat of the outer venturi tube. The present invention also provides a fire fighting system using the mixing device. The advantages of the present invention are that after the ultra-fine dry powder enters the inner venturi tube and passes through the inner throat, the cross-sectional area of ​​the pipe is reduced, thereby accelerating the ultra-fine dry powder, and the ultra-fine dry powder can be accelerated and mixed with the compressed air foam, and then accelerated through the outer throat, promoting uniform mixing of the two media, so that the compressed air foam can effectively wrap the ultra-fine dry powder without the phenomenon of dispersed distribution.

The utility model discloses a mineral insulated cable, including wear-resistant layer, spring, flame-proof layer, shielding layer, waterproof layer, packing layer, cable core and isolation frame, spring is wrapped in the wear-resistant layer, flame-proof layer is located inside the wear-resistant layer, shielding layer is located inside the flame-proof layer, waterproof layer is located inside the shielding layer, packing layer is located inside the waterproof layer, the packing layer is located inside the waterproof layer, and the packing layer is located inside the packing layer. The filling layer is located on the inner side of the waterproof layer, the wire core penetrates through the filling layer, and the isolation frame is located on one side of the wire core. According to the utility model, through the arrangement of the spring, the toughness of the cable can be increased, the cable can be prevented from being broken due to folding, and through the arrangement of the filling layer and the isolation frame, the filling layer is made of mineral substances and can effectively wrap the cable cores and cooperate with the isolation frame to separate the cable cores, thereby achieving the mineral isolation and insulation effects.

The invention discloses a valsartan-silicon dioxide micro-capsule orally disintegrating tablet and a preparation method thereof, and relates to the technical field of medicines. The invention relates to a preparation method of a valsartan-silicon dioxide micro-capsule orally disintegrating tablet. The preparation method comprises the following steps: S11, preparing an aqueous solution of a cationic surface active agent; s12, valsartan is added and stirred, so that the surface of valsartan is positively charged; s13, continuing to add silicon dioxide and stirring to enable a silicon dioxide monomer to be adsorbed on the surface of valsartan; and S14, continuously adding the cationic polymer and carrying out high-speed shearing, so that the cationic polymer is encapsulated on the surface of the silicon dioxide. The valsartan-silicon dioxide micro-capsule orally disintegrating tablet prepared by the invention has a medicine taste masking effect, and the taste masking effect is excellent; meanwhile, the problems of poor compressibility and flowability of materials caused by hygroscopicity and viscosity of valsartan are solved; a sweetening agent and a flavoring agent are not needed in the formula, so that the formula is simplified, impurities are prevented from being introduced into the essence, and the stability is effectively improved.

This invention belongs to the field of biomedical technology, specifically relating to a pharmaceutical composition formulation containing ertapenem and its preparation method. The ertapenem-containing pharmaceutical composition formulation comprises the following raw materials: 10-20 parts ertapenem, 40-60 parts choline-leucine ionic liquid, 30-50 parts polyethylene glycol-polylactic acid-glycolic acid copolymer, 2-5 parts gluconolactone, 2-3 parts antioxidant, 40-50 parts deionized water, 3-5 parts surfactant, and 20-30 parts mannitol. This invention utilizes choline-leucine ionic liquid to enhance the solubility and stability of the polyethylene glycol-polylactic acid-glycolic acid copolymer with ertapenem, forming uniform micelles to protect the drug from hydrolysis. Liquid nitrogen freezing technology is used to improve preparation efficiency and product quality, ensuring biocompatibility.

The utility model provides a novel electric test tube brush which comprises a grab handle, a servo motor is installed in the grab handle, the rotating shaft end of the servo motor penetrates through the front end of the grab handle and is fixedly connected with an installation head, and a clamping groove is formed in the front end of the installation head. A unique connector and clamping groove structure is utilized, a quick locking mechanism of the threaded sleeve is matched, stable connection of the brush head and the servo motor is ensured, quick disassembly, assembly and replacement are facilitated, the protective sleeve arranged on the threaded sleeve can effectively wrap the end of a test tube, the cleaning stability is improved, the test tube is prevented from being damaged in the cleaning process, and the service life of the test tube is prolonged. In addition, the soft contact technology is adopted to enable the protective sleeve to be tightly attached to the test tube through the first rubber ring, and the efficient rotating action of the brush head is combined, so that the cleaning effect is optimized, the protection requirement of the test tube is also considered, and the service life of the test tube is prolonged. And the operation experience and the cleaning efficiency of the electric test tube brush are remarkably improved on the whole.

The invention relates to the field of LED chip preparation methods, and particularly discloses a flip LED chip and a grinding method and a grinding system thereof. The grinding method comprises the steps that a wafer is loaded to a first carrier, the wafer comprises a first side and a second side which are opposite, a flip LED chip is arranged on the first side, metal protruding points are formed on the flip LED chip, and the second side of the wafer makes contact with the first carrier; waxing on the first side; during waxing, the first carrier is driven to be static for a first preset time and then rotate for a second preset time, so that wax is diffused on the first side, the cross sectional area of the diffused wax is smaller than that of the wafer, and a waxed wafer is obtained; loading the waxed wafer to a second carrier, and applying a preset pressure at a preset temperature, so that gaps between the metal bumps are filled with wax, the wax exceeds the outer edge of the wafer by a preset distance, and a to-be-ground wafer is obtained; and grinding the wafer to be ground. According to the invention, the fragment rate of the ground flip LED chip can be greatly reduced.

The utility model discloses an eight-edge sealing bag which comprises kraft paper with at least one surface coated with a water-based heat-sealing adhesive layer, the kraft paper comprises a front side, a back side, a left side, a right side and a bottom side which are integrally formed, the front side, the back side, the left side and the right side are coaxially arranged, the bottom side is connected to the lower portion of the back side, and the bottom side is connected to the lower portion of the back side. The front side, the left side and the right side are folded relative to the back side and are in heat-seal connection with the bottom side, the front side, the back side, the left side and the right side are in heat-seal connection, and the upper ends of the front side and the back side are folded inwards and then are in heat-seal connection. By means of the mode, the eight-edge sealing bag is made of the kraft paper, the kraft paper is high in strength, can be turned over to form a larger three-dimensional packaging space, is not prone to damage, is convenient to form, and can replace a traditional plastic packaging bag.

The invention relates to a novel double-sided same-color hot rolling pipe embroidery sheet and a production process thereof, and relates to the field of hot rolling pipes, and the novel double-sided same-color hot rolling pipe embroidery sheet comprises a high-temperature thermosetting resin color layer, a vacuum aluminum plating layer, an aluminum layer connecting resin color layer, a PET layer, an adhesive layer and a shrinkage layer which are arranged in sequence. The production process comprises the following steps: sequentially preparing an aluminum layer connecting resin color layer, a vacuum aluminum plating layer and a high-temperature thermosetting resin color layer on the surface of a PET layer to obtain a layer I; carrying out corona treatment on one side, far away from the color layer, of the I layer and one side, far away from the contraction layer, of the I layer, coating a polyurethane adhesive on the surface of the corona layer of the I layer to obtain an adhesive layer, attaching the surface of the corona layer of the contraction layer to the adhesive layer, and curing to obtain the novel double-sided same-color hot reel pipe embroidery sheet. The double-sided same-color embroidery sheet has the effect of improving the hot rolling performance and the interlayer bonding strength of the hot rolling pipe embroidery sheet, the defective rate can be effectively reduced through the double-sided same-color design, the production process is simplified, and the production efficiency is improved.

The utility model provides a phosphogypsum-based self-compacting flow-state soil on-site mixing production system which comprises a phosphogypsum crushing device, a building spoil primary crushing device, a phosphogypsum wet grinding device, a powder feeding device and a flow-state soil mixing device, a discharge port of the phosphogypsum crushing device is communicated with a feed port of the phosphogypsum wet grinding device, and a discharge port of the powder feeding device is communicated with a discharge port of the flow-state soil mixing device. A discharging port of the phosphogypsum wet grinding device is communicated with a first feeding port of the flow-state soil mixing device, the building spoil primary breaking device is communicated with a second feeding port of the flow-state soil mixing device, and the powder feeding device is communicated with a third feeding port of the flow-state soil mixing device. According to the phosphogypsum-based self-compacting fluid soil on-site mixing production system provided by the utility model, the phosphogypsum is subjected to a primary crushing and wet grinding process, so that compared with a screening technology in the prior art, 100% comprehensive utilization of the phosphogypsum can be realized, and in addition, a cementing material formed after primary crushing and wet grinding is stable in curing performance and can effectively wrap clay, so that the utilization rate of the phosphogypsum is improved. And the formed self-compacting fluid soil is stable in performance.

The invention relates to the technical field of agricultural equipment, and discloses an auxiliary soil drill soil sample rapid collection device which comprises a bottom plate, the bottom plate is of an L-shaped structure, a soil drill bit is placed at the top end of the bottom plate, a notch is formed in one side of the soil drill bit, and an electric push rod is installed on the side, away from the notch, of the top end of the bottom plate. An output shaft of the electric push rod is fixedly connected with a clamping mechanism connected with a soil drill bit, a fixing plate is fixedly connected to the top of one side of the bottom plate, a fixing block is installed at the bottom end of the fixing plate, a stabilizing shaft is fixedly connected to the bottom end of the fixing block, a marking ruler is arranged on one side of the stabilizing shaft, and a mounting base located on one side of the notch is arranged at the top end of the bottom plate and is of a U-shaped structure. According to the auxiliary soil sampler, the lifting height of the auxiliary soil sampler can be conveniently and visually known, it can be avoided that a tape measure or a ruler is adopted to measure the height of a soil layer, the problem that the soil collection process is tedious when the tape measure or the ruler is firstly used for measuring the soil layer and then collection is conducted in a soil drill bit is solved, and then the soil collection convenience is effectively improved.

This invention provides a solar cell, its fabrication process, a tandem solar cell, and a photovoltaic module. The fabrication process of the solar cell includes: providing a cell substrate; printing a conductive material onto the cell substrate; and curing the conductive material to form initial grid lines. The conductive material includes bismuth-based lead-free glass; the conductive material also includes copper powder and nickel powder; the mass ratio of copper powder to nickel powder is 80~99.5:0.5~20, and the copper powder includes flake-shaped copper powder and spherical copper powder. In the fabrication process of this invention, the conductive material, through a ternary synergistic system of "copper-nickel-glass" and a dual-morphology copper powder composite design, achieves multiple effects such as suppressing copper diffusion and oxidation and improving adhesion under an air-sintering atmosphere, thereby improving the fill factor and photoelectric conversion efficiency of the solar cell.

The invention discloses a preparation process of an ivermectin waste liquid liquid fertilizer, and relates to the technical field of liquid fertilizers. When the ivermectin waste liquid liquid fertilizer is prepared, nitric acid, urea and tetrabutyl titanate react to prepare nano titanium dioxide; performing ultrasonic treatment on nano titanium dioxide and lanthanum nitrate to obtain a waste liquid treatment agent; the preparation method comprises the following steps: reacting cellulose with pentenedioic acid and N, N-methylene bisacrylamide to prepare modified cellulose; treating the ivermectin waste liquid by using a flocculating agent to obtain pretreated ivermectin waste liquid, treating the pretreated ivermectin waste liquid by using a waste liquid treating agent, and adding the modified cellulose to obtain the ivermectin waste liquid liquid fertilizer. The ivermectin waste liquid liquid fertilizer disclosed by the invention has good water retention and slow release effects and has a good degradation rate.

The utility model discloses a height-adjustable efficient sugarcane leaf peeling device which comprises a telescopic supporting rod, a fixed sleeve and a combined type cutting tool bit, one end of the fixed sleeve is connected with the combined type cutting tool bit, and the other end of the fixed sleeve is connected with the telescopic supporting rod; the combined type cutting tool bit comprises a U-shaped girdling knife, the U-shaped girdling knife is composed of a U-shaped annular knife hook with an upward opening, the bottom of the U-shaped girdling knife is connected with the fixing sleeve, the width of the upper opening of the knife hook is larger than that of the bottom of the knife hook, the knife hook can adapt to different sugarcane stems, and a blade on the side edge of the knife hook is parallel to the length direction of the sugarcane and is arranged downwards. The efficient sugarcane leaf stripping device can rapidly and efficiently cut leaves needing to be stripped on sugarcane stems, is suitable for stripping leaves of sugarcanes with different plant heights, effectively reduces the number of times of manual arm swing leaf stripping, improves working efficiency and reduces labor intensity.

The application relates to the technical field of fresh-keeping materials, in particular to a glucosan-water-soluble cellulose antibacterial material and a preparation method and a fresh-keeping film thereof. The preparation method comprises the following steps: preparing a water-phase solution by using glucosan and water-soluble cellulose, wherein the mass concentration of the glucosan is 1.5-3.5%, and the mass concentration of the water-soluble cellulose is 1.0-2.5%; preparing an oil-phase solution by using an antibacterial agent and an emulsifier; adding the oil-phase solution into the water-phase solution and performing high-speed shearing emulsification to form a nano-emulsion; adding a crosslinking agent into the nano-emulsion to form a crosslinked emulsion with a reticular structure; and preparing the crosslinked emulsion into a slow-release capsule. The preparation method effectively wraps the antibacterial agent by using the mixed system of the glucosan and the water-soluble cellulose, and ensures that the antibacterial agent can be stably released.

The invention discloses an organic silicon dispersing agent for an oil suspending agent and a synthesis method of the organic silicon dispersing agent, and relates to the field of organic silicon. Organic silicon groups in molecules prepared by the method can well wet the surface of a pesticide raw medicine, meanwhile, macromolecules can effectively wrap and anchor the pesticide raw medicine, and a traditional surfactant part in the macromolecules can play a role in emulsifying an oil phase.

The utility model relates to the technical field of pipe benders, in particular to a multi-angle pipe bender. A multi-angle pipe bender comprises a rack and a forming block arranged on the rack, and a forming groove for containing a pipe is formed in the side wall of the forming block; the pressing assembly is located on one side of the forming block and used for abutting the pipe against the interior of the forming groove; and the driving piece is arranged on the pressing and holding assembly and used for driving the pressing and holding assembly abutting against the pipe to move along the path of the forming groove, so that the pipe presents the outline consistent with the path of the forming groove. The pipe bending device has the advantages that the pipe is effectively limited through combined application of the forming groove, the pressing and holding assembly and the driving piece, it is guaranteed that the pipe cannot move in the bending process, accurate bending machining is achieved, pipe movement can be reduced through effective pipe limiting and deformation control, and the pipe bending efficiency is improved. Therefore, the reject ratio of products is greatly reduced, and the product quality and the working efficiency are improved.

The invention discloses an ankle fixing corrective shoe, and relates to the technical field of corrective shoes. Each shoe comprises a vamp, a sole, a supporting piece, a containing cavity and a cleaning assembly, the vamp is bonded with the sole, the containing cavity used for containing the supporting piece is formed in the vamp, the supporting piece is arranged in the containing cavity to provide lateral supporting force for the foot in the vamp, and the cleaning assembly is arranged in the sole and comprises a cleaning channel, a hollow cavity, an air outlet channel and a one-way valve. A plurality of hollow cavities and a plurality of air outlet channels are arranged, one-way valves are arranged on the air outlet channels, and the air outlet channels are communicated with the cleaning channel. Pebbles entering the shoes are efficiently cleaned through the cleaning assembly, and the pebbles are firstly transferred into the cleaning channel from the cleaning opening and finally discharged from the discharging opening; and through cooperation of the hollow cavity, the air outlet channel and the one-way valve, air flow formed by air is generated for pebbles near the through position, efficient discharging of the pebbles in the cleaning channel is facilitated, and the possibility that the pebbles are blocked in the cleaning channel is reduced.

A coronary stent recovery catheter belongs to the field of medical devices, and discloses a catheter for recovering a coronary stent after it is unloaded, including a recovery tube and a connecting tube, one end of the recovery tube and the connecting tube are fixedly connected, and the other end of the recovery tube is a head end, which is arranged as a bell mouth, and the small end of the bell mouth is integrally connected with the recovery tube, and a fold from the edge to the center is arranged on the bell mouth, so that the bell mouth can be folded and contracted along the fold; the other end of the connecting tube is connected to a handle. The present invention has a simple structure and a novel concept, and can effectively wrap the unloaded stent to pull it back into the guiding catheter, has a high success rate, has low requirements on the operator, and can prevent the stent steel beam from scratching and damaging the inner wall of the head end of the guiding catheter.

The invention relates to the technical field of material science and surface engineering, and discloses a modified covalent organic framework material as well as a preparation method and application thereof. The modified covalent organic framework material comprises a covalent organic framework material as well as tannic acid and cerium ions which are loaded on the covalent organic framework material. The preparation method comprises the following steps: (1) reacting an aldehyde group-containing organic monomer with an amino group-containing organic monomer to obtain a covalent organic framework material; (2) reacting the covalent organic framework material with tannic acid to obtain a tannic acid modified covalent organic framework material; and (3) mixing an aqueous solution containing cerium salt with the tannic acid modified covalent organic framework material. The modified covalent organic framework material provided by the invention has obviously better cerium ion adsorption performance and controllable release performance, and the prepared anticorrosive coating has obviously better corrosion resistance.

The invention relates to the technical field of biology, and particularly discloses yeast composite powder capable of enhancing immunity and a preparation method of the yeast composite powder. The invention discloses yeast composite powder for enhancing immunity. Comprising the following raw materials in parts by weight: 2.5-3.5 parts of casein phosphopeptides, 700-800 parts of whey protein concentrate, 25-35 parts of Epicor yeast powder, 20-30 parts of elderberry concentrate powder, 20-30 parts of acerola cherry concentrate powder, 20-25 parts of yeast beta glucan, 5-15 parts of whey protein isolate, 5-10 parts of stachyose, 5-10 parts of spirulina platensis, 4-6 parts of sialic acid, 4-6 parts of fructo-oligosaccharide, 2-3 parts of taurine and 2-3 parts of L-lysine. And 2-3 parts of vitamin C. The composition provided by the invention can be used for enhancing immunity, and has good anti-oxidation and anti-inflammatory capacities.

The invention relates to the technical field of bacteriostatic agents, in particular to a plant extract with a bacteriostatic effect and a preparation method thereof. The preparation method comprises the following steps: S1, mixing roxburgh rose roots, burdock, fructus forsythiae fruits, liquorice, cinnamon and papaya leaves, and crushing into mixed powder; s2, preparing an extraction auxiliary agent from carboxymethyl cellulose, lactoferrin and Tween-20; s3, adding the mixed powder into water, dipping, extracting and filtering to obtain a water extract and filter residues; s4, adding the filter residues into 95% ethanol, then adding an extraction aid, and extracting at 50-60 DEG C for 1-2 hours to obtain an alcohol extract; and S5, uniformly mixing the water extract and the alcohol extract, carrying out vacuum concentration, adding modified cyclodextrin, uniformly mixing, and carrying out spray drying to obtain the plant extract with the antibacterial effect. The plant extract is prepared by combining various plant components and the modified cyclodextrin, so that the antibacterial effect of the plant extract is remarkably improved, and the antibacterial durability of the plant extract is greatly prolonged.