25results about How to "Inhibit expansion" patented technology

The utility model belongs to bridge building technical field discloses a kind of bridge high bearing capacity node optimization structure, including H-shaped steel, H-shaped steel is connected with link steel by reinforcing bolt and reinforcing nut, first hinged seat is equipped on link steel, transverse I-beam is installed on link steel, second hinged seat is equipped on transverse I-beam;Link member is connected between first hinged seat and second hinged seat, link member includes core energy consumption section, transition section and elastic connecting section, first hinged seat, second hinged seat and link member form triangular force transmission mechanism, core energy consumption section is equal cross section steel plate, two end elastic connecting sections are connected with first hinged seat and second hinged seat, top angle angle of triangular force transmission mechanism is 45 °-60 °, and the axis of first hinged seat and H-shaped steel web center line present 10 °-15 ° angle of inclusion.The utility model not only can realize the multidirectional transmission of node area force, but also can avoid the stiffness mutation problem caused by traditional welding, and can inhibit the expansion of microcrack.

The present application relates to the technical field of bamboo fiber composite material, in particular to a purification preparation method of bamboo fiber reinforced natural polymer composite material. The bamboo raw material is crushed and treated by steam explosion to obtain primary bamboo fiber; the primary bamboo fiber is sequentially subjected to organic solvent dewaxing treatment and oxidation system selective delignification treatment to obtain purified bamboo fiber; the purified bamboo fiber is treated in a tannin acid solution to form a polyphenol interface layer on the surface thereof; and a solution containing polyvalent metal ions is added to the treated bamboo fiber to form a coordination cross-linking interface layer on the surface of the bamboo fiber. The present application constructs a stable interface layer between the fiber and the natural polymer matrix. The interface layer can effectively transfer stress, significantly improve the tensile strength, bending strength and shear strength of the composite material, and solve the problem of weak interface and easy delamination of traditional natural composite materials.

This invention discloses a method for improving the resistance to postharvest black spot disease in sweet potato tubers and maintaining their quality, belonging to the field of postharvest preservation technology for agricultural products. The method includes: selecting undamaged sweet potato tubers for callus treatment at room temperature for 48 hours, disinfecting with 1% sodium hypochlorite, rinsing with sterile water and air-drying, then soaking them in a 9.0 mmol / L benzothiadiazole (BTH) solution (containing 0.05% Tween 80) at room temperature for 60 minutes, removing them and air-drying them to complete the treatment. This invention induces the activation of the sweet potato tuber's own defense system through BTH, increasing the activity of key enzymes in phenylpropane metabolism, chitinase and other disease-resistant enzymes, promoting the accumulation of total phenols and lignin, maintaining cell membrane integrity, inhibiting starch degradation and abnormal increase in soluble sugars. Under storage conditions of 28±1℃ and 80-85%RH, it can significantly inhibit the expansion of black spot disease lesions and extend the storage period to more than 25 days. This method has no pesticide residues, is unlikely to cause pathogen resistance, is environmentally friendly, simple to operate, and cost-controllable, and is suitable for large-scale postharvest preservation of sweet potato tubers.

This invention discloses a high-performance vitrified microsphere composite polystyrene particle insulation board and its preparation method, comprising the following steps: premixing hydrophobic vitrified microspheres and expandable polystyrene particles coated with expanded graphite at a mass ratio of (2.5~4):1 to obtain composite lightweight aggregate. The insulation board prepared by this invention, with a dry density of only 184-193 kg / m³, exhibits a compressive strength as high as 0.275-0.302 MPa, significantly superior to traditional inorganic insulation boards (0.15-0.25 MPa) and organic insulation boards (0.10-0.15 MPa); its thermal conductivity is as low as 0.034-0.041 W / (m·K), and its insulation efficiency is more than 40% higher than that of traditional inorganic materials, while also possessing Class A fire safety performance; furthermore, the process is simple and controllable, with an industrial solid waste utilization rate of up to 70%, demonstrating significant economic benefits and environmental value, and possessing broad prospects for widespread application.

The application belongs to the technical field of polymer preparation, and particularly relates to a high-strength self-supporting polypyrrole nano array and a preparation method and application thereof. The preparation method comprises the following steps: (1) first, dispersing a hydroxypropyl-beta-cyclodextrin and polyethylene glycol aqueous solution onto an ice surface, and then adding a pyrrole monomer to form a dispersion liquid; (2) adding an acid solution containing an oxidizing agent to the dispersion liquid, and obtaining the high-strength self-supporting polypyrrole nano array after reaction. The application directly uses a macroscopic ice block as a hard template for polypyrrole preparation, and introduces a cyclic molecule hydroxypropyl-beta-cyclodextrin with hydrophilic and hydrophobic dual functions and polyethylene glycol with a linear polymer chain as an array growth aid, so that a high-strength polypyrrole nano sheet array with a self-supporting structure is prepared through a one-step polymerization method. The high-strength polypyrrole nano sheet array can be used as a conductive filler of polyurethane in the field of 3D printing technology, and greatly improves the mechanical properties and antistatic ability of products.

The application discloses a kind of high-performance outdoor full package imitation wood composite board and preparation method thereof, relate to polyurethane composite board technical field, the full package imitation wood composite board includes base board, and the polyurethane material of setting in the lower surface and the four around of base board, and the resin material of setting in upper surface.Its preparation method includes the following steps: pouring polyurethane material in the silica gel mould after surface treatment, place base board, mould pressing, make the polyurethane material with wood texture around and lower surface of base board composite, obtain intermediate product A;Resin material is rolled on the upper surface of intermediate product A, and is dried, to obtain full package imitation wood composite board;The silica gel mould after surface treatment is prepared by transferring real solid wood board texture.

This invention discloses a five-layer electrodeposited high-sealing corrugated pipe based on ultrasound assistance and its preparation method, belonging to the technical field of metal corrugated pipe manufacturing. It aims to solve the problem that in multi-layer electrodeposited corrugated pipes, it is difficult to effectively coordinate current density, surface quality, and interfacial bonding strength, leading to insufficient densification of the deposited layer, unstable interlayer bonding, poor wall thickness uniformity, and failure to meet airtightness standards, ultimately resulting in poor overall performance stability. This invention includes a five-layer composite structure in which the pipe wall is composed of alternating nickel-cobalt alloy and copper layers. Each layer of the five-layer composite structure undergoes ultrasonic vibration treatment during deposition. The corrugated pipe prepared by this invention has a uniform and dense deposited layer with good interlayer bonding. The five-layer alternating deposition layer composite structure not only achieves uniform stress transmission and dispersion, effectively delaying crack propagation and interfacial penetration, but also improves the uniformity of wall thickness distribution, enabling the corrugated pipe to exhibit higher structural stability and long-term reliability in a sealed environment.

The application discloses a high-pressure die-casting motor rotor casting aluminum alloy and a preparation method thereof, and belongs to the technical field of motor rotor materials. The high-pressure die-casting motor rotor casting aluminum alloy comprises the following components in percentage by mass: Mg 0.75-0.85 wt%, Fe 0.15-0.25 wt%, Ti≤0.03 wt%, Ga≤0.03 wt%, Zn≤0.03 wt%, Cu≤0.03 wt%, Mn≤0.01 wt%, Si≤0.01 wt%, other impurities≤0.35 wt%, and the balance of Al. The type of elements and the percentage by mass of each element are specifically limited, the percentage by mass of Si is reduced, the influence of Si on the electrical conductivity of the aluminum alloy is reduced, the electrical conductivity of the aluminum alloy is improved to a certain extent, the percentage by mass of Mg and Fe is limited, Mg forms a solid solution in Al, Fe interacts with Al to form phases such as Al3Fe, and the strength and hardness of the aluminum alloy are improved, so that the balance between the mechanical properties and the electrical conductivity of the motor rotor casting aluminum alloy is achieved.

The application provides a polymethyl methacrylate product and a preparation method thereof. The preparation method of the polymethyl methacrylate product comprises the following steps: S1. mixing a resin matrix, a toughening agent, an antioxidant and a light stabilizer to obtain a mixture; the resin matrix comprises a polymethyl methacrylate resin; the toughening agent comprises a core-shell structure toughening agent and a polyester-based toughening agent; the core-shell structure toughening agent comprises a core and a shell layer; the core comprises polybutyl acrylate, and the shell layer comprises polymethyl methacrylate; S2. melt blending, extruding and granulating the mixture, and drying, injection molding, cooling and annealing. In the application, the core-shell structure toughening agent and the polyester-based toughening agent can synergistically improve the toughening effect.

This invention relates to the field of power cable technology, and proposes a high-toughness steel strand and its preparation method. The high-toughness steel strand includes bare stranded wire and an epoxy coating sprayed onto the surface of the bare stranded wire. The epoxy coating raw materials include the following components in parts by weight: 100 parts epoxy resin, 25-30 parts carboxylated ternary chloroform resin, 20-50 parts polyphenylene ether, 30-40 parts nano-calcium carbonate, 2-4 parts curing agent, and 1-3 parts degassing agent. This technical solution solves the problem of poor toughness of epoxy coatings on steel strands in related technologies.

This invention discloses a layered concrete structure with anti-penetration and filtering properties and its preparation method. It solves the problem in existing technologies where only the composition of the concrete layers is changed without improving the overall filtering performance. This invention has the beneficial effects of improving filtering performance and preventing further crack development. The specific solution is as follows: A layered concrete structure with anti-penetration and filtering properties includes a fiber-reinforced concrete layer and an intermediate composite material layer. The intermediate composite material layer is placed between two fiber-reinforced concrete layers. The fiber-reinforced concrete layer and the intermediate composite material layer are periodically arranged to form a layered concrete structure to enhance the filtering performance and improve the anti-penetration performance. The fiber-reinforced concrete layer contains steel fiber reinforcement to enhance the anti-penetration performance of the layered concrete structure. The wave transmittance in the intermediate composite material layer is different from that in the fiber-reinforced concrete layer, and the intermediate composite material layer is bonded to the fiber-reinforced concrete layer.

This invention discloses a welding method for fabricating a three-dimensional reinforced steel / aluminum welded joint on a steel surface, belonging to the field of dissimilar metal welding technology. This invention employs laser selective melting to fabricate a three-dimensional geometric structure on the surface of a steel substrate, forming a surface with a high aspect ratio and high specific surface area. By using brazing or fusion brazing methods, the bonding area between the liquid aluminum and the steel plate and the three-dimensional geometric structure is greatly increased, effectively suppressing crack propagation and achieving a dual enhancement of the strength and toughness of the steel / aluminum dissimilar metal joint. This method increases the specific surface area of ​​the steel / aluminum joint interface, improving sliding resistance under external loads, while the three-dimensional geometric structure itself bears some of the stress. Simultaneously, the three-dimensional geometric interface structure can alleviate joint interface stress and improve stress distribution, which is beneficial for obtaining a welded joint with good performance.

This utility model discloses a road surface widening and reinforcement structure, relating to the field of highway construction technology. It includes a vertical stepped structure, a longitudinal cast-in-place layer, a longitudinal cast-in-place top layer, and crack-resistant components. The vertical stepped structure is formed by cutting the old road surface base layer with a longitudinal cutting machine to create a stepped overlapping interface, with the cutting depth consistent with the thickness of the corresponding structural layer. The longitudinal cast-in-place layer is placed at the joint between the old and new road surfaces in the cement-stabilized crushed stone lower base layer, and the longitudinal cast-in-place top layer is placed at the joint of the upper base layer with its top surface flush. The crack-resistant components include ribbed steel bars transversely embedded in the middle of the upper base layer, crack-resistant wire mesh laid at the bottom of the lower base layer, and crack-resistant tape covering the joint of the upper base layer. This utility model achieves a seamless connection between the old and new road surfaces, forming an integrated load-bearing system and significantly improving the road surface's load transfer capacity and deformation resistance.

This invention relates to the field of multilayer curable base film technology, specifically to the online coating of polyester optically curable base films and its preparation method. This invention overcomes the problem in existing technologies where the adhesion and optical performance of the curable base film cannot be simultaneously achieved. First, this invention obtains core-shell structured functional particles by modifying in-situ polymethyl methacrylate with nano-silica; second, it obtains modified PET by melt blending optical-grade PET chips; finally, it melts the functional particles and modified PET to obtain an anti-adhesion masterbatch, prepares a composite base film through three-layer co-extrusion and biaxial stretching, coats it with a functional coating liquid, cures it stepwise to form a curing layer, and then heat-sets it to obtain the optically curable base film. Through base film modification, functional particle core-shell design, three-layer co-extrusion structure, and the synergistic effect of coating and process, this invention produces a polyester optically curable base film that combines high optical performance and good coating adhesion, applicable to release protection in the electronics field, decoration in the home appliance field, and other fields.

This invention discloses a high-toughness crack-resistant concrete and its preparation method, relating to the field of building materials technology. The high-toughness crack-resistant concrete includes cementitious materials, aggregates, water, admixtures, and reinforcing components. The reinforcing components include a multi-scale hybrid fiber system and a time-compensated shrinkage system. The multi-scale hybrid fiber system includes micro-scale high-modulus fibers and macro-scale crack-resistant fibers. The micro-scale high-modulus fibers are used to inhibit the initiation of cracks in the concrete matrix and induce crack refinement. In this invention, by setting up a multi-scale hybrid fiber system and utilizing the synergistic effect of micro-scale high-modulus fibers and macro-scale crack-resistant fibers, the entire process of concrete cracking is controlled. Due to their small diameter and large specific surface area, the micro-scale high-modulus fibers can be uniformly distributed in the concrete matrix, effectively inhibiting crack initiation and inducing crack refinement after crack formation.

The utility model provides a kind of concrete anti-cracking cutoff wall structure, including inner layer, embedded bar, fixed plate, frame, the inside embedded bar is embedded in the inner layer, the root of the embedded bar is fixedly connected with fixed plate, fixedly connected with frame between the fixed plate, the frame is connected head to tail by several diamond pieces, several intersection places of the frame are fixedly connected with node, the node is fixedly connected with reinforcing bar between, the reinforcing bar is transversely arranged;The outer surface of the inner layer is wrapped with a middle layer.The utility model has the advantages that: the wall body mechanical property is promoted: fractal network realizes stress multistage dissipation, and maximum deformation under 10kPa uneven load is reduced;The anti-cracking cutoff optimization of the wall body: outer layer C40 concrete and carbon fiber cable cooperate to inhibit crack propagation, and leakage risk is greatly reduced;The wall body realizes multifunctional integration: gradient design of inner layer heat preservation, middle layer load bearing, outer layer waterproof, and comprehensive performance is better than single material structure.

This invention discloses a field control agent for loquat branch and trunk brown rot, composed of one or more of the following: thiamethoxam, difenoconazole, tebuconazole, chlorfluazuron-pyraclostrobin, pyraclostrobin-azoxystrobin, cymoxanil acetate, fluoxastrobin, azoxystrobin, 24-hydroxybrassinolide, and amino acid foliar fertilizer. This invention, through single-agent or combined application, can effectively inhibit the spread of loquat branch and trunk brown rot, with control efficacy exceeding 60%, filling the gap in drug treatment for loquat branch and trunk brown rot.

The application discloses a kind of film coating of metal surface of electric tricycle and its preparation method and application, belong to electric vehicle coating coating processing technical field, including the following weight fraction components:70~75 parts single-component acrylic acid epoxy hybrid emulsion, 12~15 parts polydopamine modified curcumin loaded LDH, 8~11 parts double-end amino polydimethylsiloxane modified ZIF-8 / ferroferric oxide nanocomposite, 10~12 parts attapulgite, 5~6 parts sericite powder, 5~6 parts rutile titanium dioxide, 0.8~1 parts dispersing agent, 0.2~0.3 parts defoaming agent, 0.2~0.3 parts leveling agent, 0.5~0.6 parts film forming agent, 20~25 parts deionized water.In the present application, polydopamine modified curcumin loaded LDH, double-end amino polydimethylsiloxane modified ZIF-8 / ferroferric oxide nanocomposite, attapulgite three main components have synergistic effect, if coating crack appears, compared with prior art, corrosion propagation is obviously inhibited.

This invention discloses a magnesium-aluminum alloy for seat brackets, its preparation method, a seat bracket, and a vehicle, belonging to the field of automotive technology. Based on the total weight of the magnesium-aluminum alloy, its chemical composition, calculated by mass percentage, includes: aluminum: 2.5%-4.0%; zinc: 2.0%-3.5%; tin: 0.8%-1.5%; calcium: 0.3%-0.6%; cerium: 0.05%-0.2%; manganese: 0.2%-0.4%; with the remainder being magnesium and unavoidable impurities. By controlling the aluminum content to a low range, the coarse, brittle network phase β−Mg is suppressed at its source. 17 Al 12 The introduced calcium element preferentially reacts to form the Al2Ca phase, thereby maximally suppressing the formation of β−Mg. 17 Al 12 The formation of the phase, along with the introduction of tin, results in the formation of the high-hardness Mg2Sn phase with magnesium, which serves as the main precipitation strengthening phase. Trace amounts of cerium act as a synergistic phase morphology regulator, influencing the morphology of the Al2Ca and Mg2Sn phases during solidification and pinning them to the grain boundaries. Through this multi-phase regulation, the alloy achieves high strength while avoiding the toughness loss caused by the presence of a large number of brittle phases in traditional magnesium alloys.

This invention discloses a device and method for monitoring cracks in new and old road surfaces. The device includes a first reinforcing bar, a hollow sleeve, and a second reinforcing bar arranged coaxially. The first reinforcing bar is connected to one end of the hollow sleeve in the form of a piston, and the other end of the hollow sleeve is connected to the second reinforcing bar via a rotating shaft. A laser displacement sensor is installed at the end of the first reinforcing bar, and a liquid sensing device is installed inside the hollow sleeve. By processing the data collected by the laser displacement sensor and the liquid sensing device, crack information is obtained for real-time monitoring of cracks. This invention can be directly buried in the new and old roadbeds to monitor the new and old road surfaces in real time, thereby accurately obtaining road surface crack information and automatically providing crack monitoring information for road maintenance. This allows road surface cracks to be repaired effectively in the early stages, extending the service life of the road surface and ensuring the comfort and safety of road use.

This invention relates to a high-wear-resistant modified phenolic resin material for guide rings and its preparation process. The high-wear-resistant modified phenolic resin material for guide rings is prepared from the following raw materials in parts by weight: 100 parts linear phenolic resin, 20-35 parts polyimide prepolymer, 20-45 parts reinforcement, 10-25 parts wear-resistant filler, 1-3 parts silane coupling agent, and 8-12 parts curing agent; the polyimide prepolymer is prepared by reacting pyromellitic dianhydride with 4,4'-diaminodiphenyl ether; the high-wear-resistant modified phenolic resin material for guide rings prepared by this invention exhibits excellent high-temperature wear resistance.

This invention relates to the field of soft-light tile technology, and in particular to an environmentally friendly and wear-resistant soft-light tile and its preparation method. The components, by weight, include 20-40 parts quartz, 30-60 parts waste slag powder, 10-25 parts feldspar, 10-20 parts kaolin, 5-15 parts clay, 5-15 parts talc, 5-15 parts lamellar alumina, 1-5 parts sintering aid, and 0.5-3 parts binder. This invention employs the aforementioned environmentally friendly and wear-resistant soft-light tile and its preparation method, combining waste slag powder and lamellar alumina with other components. This breaks through the traditional single-aggregate reinforcement mechanism. The preparation process uses a two-stage sintering process, resulting in a stronger bond between the glaze and the body, a more uniform surface texture, and greater controllability of the soft-light effect.

This invention belongs to the field of biomedical technology and discloses a methylene blue-fingolimod prodrug based on hypochlorous acid activation, its preparation method, and its application. Fingolimod and methylene blue, which has hypochlorous acid scavenging and neuroprotective functions, are bonded together via a hypochlorous acid-sensitive thioether bridge. This design cleverly utilizes the abnormally high concentration of hypochlorous acid within the lesion as "molecular scissors," achieving precise activation of the prodrug at the target site and synergistic release of both drugs. This not only endows fingolimod with targeted noise reduction and enhanced efficacy but also simultaneously implements a combined attack of "detoxification" and "anti-inflammation," thereby more thoroughly breaking the damage cascade and providing a novel synergistic solution for stroke treatment.

The application provides a preparation method of nanocellulose-based composite thermal insulation material and application thereof. The method first prepares a GO-NC-Ce hybrid dispersion liquid through ultrasonic-assisted self-assembly; then, a flexible polymer is used as a matrix, carbon nanotubes, pre-dispersed aerogel particles, phase change microcapsules, a phase change energy storage framework and a composite foaming system are added, and a multifunctional composite slurry is prepared through high-speed shearing and vacuum degassing; subsequently, a gradient ice crystal template is formed through a freeze-drying technology by controlling a freezing rate, and a foaming body with a gradient pore structure of a bottom layer, a main body layer and a surface layer is obtained after sublimation of the ice crystal; finally, a surface layer slurry containing sepiolite fibers, nanometer titanium dioxide and a hydrophobic agent is sprayed on the surface of the foaming body and solidified to obtain the composite thermal insulation material. The obtained material has controllable porosity and excellent heat insulation performance, and is suitable for the field of wearable textile thermal insulation.