19results about How to "Adjustable density" patented technology

The invention provides a polyvinylidene fluoride-based nanofiber yarn wave-absorbing fabric as well as a preparation method and application thereof, and belongs to the technical field of preparation of wave-absorbing composite materials. The preparation method comprises the following steps: preparing nanofiber yarns or nanofiber core-spun yarns by adopting a conjugate electrostatic spinning technology, directly adding a conductive substance into a spinning solution to form conductive nanofibers, and further coating the nanofiber yarns or the nanofiber core-spun yarns with a PDA shell layer to improve the wear resistance and reduce silver nanoparticles in situ; finally, the yarns are woven into fabric through a weaving or knitting technology, and the fabric is applied to the fields of buildings, electromagnetic protective clothing, flexible electronics and the like. Compared with an existing microwave absorbing material, the fabric-based material is light in weight and good in mechanical flexibility and processability. Fabrics formed of nanofiber yarns or nanofiber core spun yarns facilitate the induction of interfacial polarization and multiple reflections, and can deeply design material properties. The material provided by the invention has better wear resistance, wearability and microwave absorption performance, and is suitable for actual production and application.

The invention discloses a method for preparing a concrete early strength nucleating agent through partial depolymerization and modification regeneration of waste PET, and particularly relates to the technical field of concrete admixture preparation. A part of degradation products obtained after waste PET polyester is treated in dihydric alcohol and polyfunctional silane are subjected to chemical reaction to achieve construction of the high-specific-surface-area active spherical structure. The method for preparing the early strength nucleating agent has the advantages of simple steps, greenness, mildness, low cost, obvious early strength enhancing effect, no influence on or even improvement of the later strength, and effective reduction of the carbon emission in the waste consumption process, and the waste utilization rate is close to 100%. The surface of the prepared early-strength nucleating agent is rich in a large amount of active hydroxyl groups, the early-strength nucleating agent is easily complexed with calcium ions in concrete to form a calcium silicate hydrate gelling product, more nucleating sites are provided, the hydration rate and the early strength are effectively improved, and the early-strength nucleating agent has application prospects in the fields of road rescue, plateau construction and the like.

The invention discloses a solid-waste-based mine filling material as well as a preparation method and a use method thereof, and relates to the field of mine filling. The solid waste-based mine filling material comprises the following components in percentage by weight: 20-50% of tailings, 10-30% of slag, 10-30% of modified fly ash, 5-15% of phosphogypsum, 5-10% of sodium carbonate, 5-10% of cement and 1-10% of a foaming agent. Wherein a copolymer of PVA, polyacrylate or vinyl acetate and acrylate is formed on the surface of the modified fly ash. By implementing the method disclosed by the invention, bleeding of the solid-waste-based mine filling material can be greatly reduced, free adjustment of the density of the solid-waste-based mine filling material can be realized, and the consumption of cement and other components is reduced. Meanwhile, the dry shrinkage resistance and the freezing and thawing resistance of a filling body formed by the solid waste-based mine filling material are also improved.

The utility model discloses a kind of metal composite material walkway plates, comprising: footpath cantilever support, footpath cantilever support is spacedly arranged multiple along the length direction of prefabricated beam, the fixed end of multiple footpath cantilever support is fixedly connected with prefabricated beam;Steel grating frame, steel grating frame is multiple, the length direction of each steel grating frame Two ends are respectively overlapped and fixed on adjacent two footpath cantilever supports;Continuous no-alkali glass fiber felt reinforced polyurethane rigid foam plate, polyurethane rigid foam plate is multiple, and it is flatly fixed on multiple steel grating frames;Guardrail, guardrail is fixed on the cantilever end of footpath cantilever support.The footpath step plate is combined use by steel grating frame and polyurethane rigid foam plate, can greatly improve the durability of footpath step plate, and has the advantages of light weight, high strength.

This invention discloses a method for preparing and applying an antibacterial composite coating based on quaternized zinc oxide nanoparticles. The preparation method includes: grafting quaternary ammonium salt compounds onto the surface of zinc oxide nanoparticles to prepare synergistic antibacterial nanoparticles; modifying the substrate surface by co-deposition of dopamine and polyethyleneimine to introduce active functional groups; and spraying or dipping the quaternized zinc oxide nanoparticles onto the modified substrate surface to obtain the antibacterial composite coating. This novel antibacterial material preparation scheme can integrate the advantages of zinc oxide nanoparticles and quaternary ammonium salts, while solving key technical problems such as nanoparticle aggregation, weak interfacial bonding, and limited antibacterial efficiency. It is of great significance for promoting the upgrading of hygiene and safety in the fields of medicine, food, and building materials.

The invention discloses an Mxene / CNT / metal oxide aerogel packaging and reinforcing material and a preparation method and application thereof, and belongs to the technical field of anti-radiation packaging and reinforcing materials for electronic devices and preparation of the anti-radiation packaging and reinforcing materials. The problem that the shielding performance of an existing anti-radiation packaging reinforcing material for the electronic device is limited is solved. According to the invention, MXene is adopted as a matrix, carbon nanotubes are adopted as a structural reinforcement to serve as a matrix material for constructing aerogel, a porous structure and a large surface area of the matrix material are modified with a radiation shielding functional material, PVA is adopted as a cross-linking agent to improve the mechanical property of aerogel, and finally, a freeze-drying technology is adopted to prepare the radiation shielding aerogel. The MXene / CNT / metal oxide aerogel packaging material with multiple functions and adjustable performance is prepared. Compared with a polymer-based composite material, the aerogel framework can improve the loading capacity of functional particles to the maximum extent, performance improvement is achieved, and then design and development of the light efficient anti-radiation packaging and reinforcing material are achieved.

The application provides a preparation method of 1,2-pentanediol and belongs to the technical field of fine chemical synthesis. The 1,2-pentanediol is prepared by the following steps: furaldehyde, a solvent and a catalyst are loaded into a reaction kettle, nitrogen in the kettle is replaced by nitrogen gas, hydrogen in the kettle is replaced by hydrogen gas after the nitrogen replacement, and then the reaction is carried out by heating and hydrogen charging to obtain the 1,2-pentanediol; the catalyst uses hydrotalcite as a carrier, active components Ni and Cu are dispersed in the carrier, the loading amount of the active components is 5wt%-20wt%, the mass ratio of the Ni and the Cu is 1:2-3:1, and the specific surface area of the hydrotalcite carrier is 10-20m 2 / g. The method provided by the application is simple in process, high in yield, small in smell of prepared 1,2-pentanediol and suitable for daily chemical products.

The invention belongs to the technical field of spraying equipment, and particularly relates to an aluminum profile surface spraying device and a self-adaptive adjusting device.The aluminum profile surface spraying device comprises a spraying room, a suspended ceiling and an aluminum profile, the suspended ceiling penetrates through the spraying room, and a hanging rail is laid on the lower surface of the suspended ceiling through a hanging rod; the aluminum material spraying device further comprises an adjustable hoisting assembly, the adjustable hoisting assembly and the hoisting rail are hoisted in a sliding mode, strip devices are distributed at the two ends of the adjustable hoisting assembly in an array mode at an adjustable interval, and the two strip devices at the same height are used for clamping the two ends of an aluminum material and driving the aluminum material to rotate during spraying operation. And the paint suction assembly and the spraying machine are symmetrically distributed on the two sides of the spraying area, the paint suction assembly internally comprises a suction channel outer body arranged in a lifting mode, and the suction channel outer body moves up and down along with the spraying head and is used for increasing the spraying area while recycling paint. The problems that in a horizontal spraying mode, decoration face covering is uneven, the space utilization rate is low, and raw material loss is large are solved.

This invention discloses a slow-release granule formulation of sodium alginate-biochar loaded with thiamethoxam, its preparation method, and its application. The slow-release granule uses biochar as the adsorbent carrier to adsorb thiamethoxam and sodium alginate as the encapsulating material, which is then cross-linked and solidified by dripping calcium chloride solution. The mass ratio of biochar to thiamethoxam is (10~30):1, the mass-to-volume ratio of sodium alginate to water is 1.5~2.0 g:100 mL, and the concentration of the calcium chloride solution is 1.5%~3.0%. The prepared slow-release granule has a cumulative release time of over 90 hours in distilled water, with no obvious burst release phenomenon. Pot experiments show that it maintains a continuous control effect on eggplant thrips for 7 days after application, which is superior to conventional spraying treatment. This invention has a simple preparation process, is environmentally friendly, and has excellent slow-release performance, making it suitable for green control of agricultural pests.

This invention belongs to the field of petroleum extraction technology, specifically relating to a high-temperature, high-pressure kill fluid, its preparation method, and its application. The composition and mass fraction (total 100 parts) of the kill fluid are as follows: potassium formate 10-40 parts; barium sulfate 1-3 parts; polyacrylamide 0.05-0.1 parts; amphoteric guar gum 2-5 parts; the remainder is tap water; the molecular structure of the amphoteric guar gum is as follows: [Insert molecular structure formula here]. The kill fluid of this invention has the advantages of adjustable density, low corrosion rate, low API water loss, good anti-swelling effect, and low formation damage.

The utility model discloses a handheld agricultural liquid mulching film sprayer, which belongs to the technical field of agricultural equipment and comprises a sprayer body, a telescopic component is arranged in the sprayer body, spraying components are arranged on two sides of the sprayer body, the bottom of the sprayer body is connected with a handheld handle, and one side of the handheld handle is connected with a rubber hose. According to the handheld agricultural liquid mulching film spray head, the influence of liquid mulching film spraying on stems and leaves of plant seedlings is reduced, meanwhile, the spray head can be automatically adjusted according to the density and height of rhizomes of different crops and the actual width of each field, and the spraying efficiency can be effectively improved.

The invention discloses a supported nickel catalyst for preparing 1, 3-propylene glycol by hydrogenation of a 3-hydroxypropionaldehyde fixed bed, and a preparation method and application thereof, and relates to the technical field of catalysts. The catalyst provided by the invention takes a carrier with a large specific surface area and a large aperture as a matrix, and an active component nickel is uniformly loaded to the surface of the carrier in a highly dispersed manner by adopting a precipitation-deposition method; in the catalyst forming stage, a neutral or alkaline binder is selected, so that a pre-roasting step of a precipitation product is avoided, and the finally prepared catalyst not only has higher hydrogenation activity, but also has a certain cost advantage. The supported nickel catalyst prepared by the invention has high catalytic activity and selectivity in the process of preparing 1, 3-propylene glycol by hydrogenation of a 3-hydroxypropionaldehyde fixed bed, and is suitable for industrial continuous production of 1, 3-propylene glycol.

The invention relates to the technical field of oil and gas field development, in particular to an underground in-situ cured foam flow regulating system and a preparation method and application thereof.The foam flow regulating system is characterized in that a foaming agent, a foam stabilizer, a curing material and formation water form a foam system solution, and the curing material is composed of a curing main agent and a curing auxiliary agent; in the foam system solution, the mass fraction of the foaming agent is 0.1 wt%-1.2 wt%, the mass fraction of the foam stabilizer is 5 wt%-20 wt%, the mass fraction of the curing main agent is 10 wt%-40 wt%, the mass fraction of the curing auxiliary agent is 5 wt%-20 wt%, and the balance is formation water. According to the foam flow regulating system provided by the invention, the curing material is added into the foam system, and the high-strength porous plugging material is formed after the foam system is injected into the stratum, so that the plugging of cracks and holes is realized, and a porous structure can also be used for providing shear regeneration conditions for the subsequent foam migration process.

The present invention belongs to biomedical technology, and specifically relates to a FLT3 and BCL-2 dual inhibitor micelle and its preparation method and application. b ‑P(A‑ What ‑DTC), peptide amphiphilic polymers T‑PEG‑ b ‑P(A‑ What ‑DTC), FLT3 inhibitor and BCL‑2 inhibitor are mixed in a solution to obtain the FLT3 and BCL‑2 dual inhibitor micelles. The present invention designs and prepares two multifunctional biodegradable micelles to efficiently load and deliver two small molecule targeted drug combinations to AML cells at an optimal synergistic ratio. The nanocarriers with excellent performance have the advantages of stable drug loading, long circulation, and targeting tumor cells. It is expected that the drug combination at the optimal synergistic ratio and dosage can be specifically targeted to tumor cells, greatly reducing the toxic and side effects of the drugs, and efficiently achieving drug efficacy, so as to improve the therapeutic effect on AML.

The invention relates to the technical field of foamed cement paste, in particular to a foaming agent composition for oil field well cementation and a preparation method thereof, and further discloses foamed cement paste and a preparation method thereof. The foaming agent composition is composed of alkyl diphenyl ether disulfonate, alkyl glycoside, cocamidopropyl betaine, alkylolamide, octylphenol polyoxyethylene ether and water, and has the characteristics of good water solubility, good compatibility, dense and lasting generated foam, low interfacial tension, high foaming amount and long half-life period, and meanwhile, the foaming agent composition can be used for well cementation in oil fields. Foamed cement paste prepared by taking the foaming agent composition for well cementation in the oil field as a raw material is adjustable in density, the strength of foamed cement coagulum is not reduced, the permeability of set cement is effectively reduced, the compactness of the set cement is improved, and the cementing construction requirement can be met.

The invention discloses a three-dimensional continuous graphite network structure material and a preparation method and device thereof. The preparation method comprises the following steps: S1, introducing carbon source gas into a reactor filled with a carbon fiber skeleton, carrying out pyrolytic reaction on the carbon source gas at 1100-1500 DEG C, and growing pyrolytic carbon generated by the reaction on the carbon fiber skeleton to obtain a pyrolytic carbon coated carbon fiber structure; s2, in an inert atmosphere, performing graphitization treatment on the carbon fiber structure to form a three-dimensional continuous graphite network structure material; the graphitization treatment temperature is greater than or equal to 2500 DEG C. Different from a traditional CVI densification process, the preparation method has the advantages that a carbon fiber skeleton with a low volume fraction is used as a growth template instead of a reinforced phase, the isotropic (quasi-isotropic), high-thermal-conductivity, high-electric-conductivity and density-adjustable continuous graphite network material is obtained by accurately controlling growth space and conditions, and the preparation method is suitable for the fields of thermal management, electrodes and the like.

The invention discloses high-strength electrical epoxy resin and a preparation method thereof in the technical field of epoxy resin. The high-strength electrical epoxy resin comprises the following components in parts by weight: 30-50 parts of bisphenol F epoxy resin, 50-70 parts of bisphenol A epoxy resin, 15-25 parts of a functionalized epoxy monomer, 30-40 parts of a hyperbranched curing agent, 5-8 parts of a reactive diluent, 0.5-1 part of an antioxidant, 10-15 parts of aluminum hydroxide and 1-2 parts of a silane coupling reagent. By introducing the functionalized epoxy monomer and the hyperbranched curing agent, the technical effects of remarkably improving the tensile strength of the epoxy resin, improving the interfacial compatibility of the inorganic filler and the resin matrix, increasing the volume resistivity and reducing the dielectric loss are achieved.

The invention relates to the field of oil and gas well cementing engineering, and discloses a cement strength stabilizing material, an oil well cementing cement slurry system and application thereof. The cement strength stabilizing material comprises 30-80 parts by weight of a first strength stabilizing material and 20-70 parts by weight of a second strength stabilizing material, wherein the first strength stabilizing material is a mixture of quartz sand and glass powder; and the second strength stabilizing material is a mixture of at least two of spodumene, andalusite, olivine, leucite, garnet, grandalite, granite, garnet, nepheline, cross stone, spinel and graphite, and the second strength stabilizing material is a mixture of at least two of the spodumene, the andalusite, the olivine, the leucite, the garnet, the granite, the beryl, the nepheline, the cross stone, the spinel and the graphite. A cement slurry system containing the cement strength stabilizing material is suitable for working conditions of high-temperature direct forming such as deep wells and ultra-deep wells, is also suitable for working conditions of low-temperature forming and high-temperature service such as heavy oil steam exploitation, has good comprehensive performance and has a wide market application prospect.

The invention discloses a metal net and a preparation method thereof, the metal net is of a grid structure formed by metal lines in a closed mode, the aperture ratio of the metal net is larger than or equal to 95%, the average area of all holes of the metal net is smaller than 45 mm < 2 >, and the width of the metal lines larger than or equal to 50% in the metal net is smaller than 0.05 mm. The corresponding concave grids are designed on the female die, and the electroplating process is adopted, so that metal is deposited in the concave grids to obtain the metal net; different metal nets can be obtained by adjusting the line width and the line number density of the concave grids of the female die and replacing corresponding main body metal electroplating liquid, meanwhile, a plurality of different kinds of metal can be electroplated on the metal nets through a plurality of coating metal electroplating tanks, operation is flexible, and preparation is easy.