9results about How to "Adjustable density" patented technology

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 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 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 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.