274results about How to "Guaranteed mechanical properties" patented technology

The invention relates to a steel bar for an automobile transmission shaft based on an ecological electric furnace and a production method. The steel bar for the automobile transmission shaft comprises the following chemical components: 0.18-0.22% of C, 0.22-0.33% of Si, 0.85-1.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 1.05-1.20% of Cr, less than or equal to 0.25% of Ni, less than or equal to 0.10% of Mo, 0.05-0.09% of Ti and less than or equal to 0.15% of Cu. And the balance of Fe and impurities. The production process comprises the steps of ecological electric furnace smelting, LF refining, RH refining, continuous casting, casting blank heating, rolling, heat preservation and heat treatment. According to the invention, a smelting continuous casting process of'ecological electric furnace + LF + RH + continuous casting 'is adopted, and is matched with a proper rolling process, so that the steel bar for the automobile transmission shaft, which is high in steel purity and excellent in mechanical property and surface quality, is produced, and the requirements of high-end products can be met.

The invention belongs to the technical field of civil engineering materials, and particularly relates to a coal gangue-based solid waste cementing material as well as a preparation method and application thereof. The coal gangue-based solid waste cementing material is prepared from the following raw materials in percentage by mass: 60-80% of activated coal gangue powder, 5-20% of an exciting agent, 5-15% of superfine slag powder, 2-5% of silica fume, 1-3% of gypsum and 1-3% of fan blade short fibers. According to the invention, solid waste resources (coal gangue and superfine slag powder) are recycled, and on the basis of consumption of the solid waste resources, the coal gangue-based solid waste cementing material obtained by using the solid waste resources has good mechanical properties and durability, and can meet the use requirements of highway engineering base layers.

The invention relates to the technical field of photovoltaic packaging materials, and discloses a black high-reflection infrared integrated packaging material and a preparation method thereof, and the black high-reflection infrared integrated packaging material comprises a bonding packaging layer, a light management layer, a mechanical transition layer and an insulating supporting layer which are arranged from top to bottom; all the layers are subjected to integrated melting and co-extrusion to obtain the packaging material; the first melting point of the bonding packaging layer is 70-100 DEG C, the second melting point of the bonding packaging layer is 110-130 DEG C, and the content of the cross-linked gel after irradiation is 5-30%; the melting point of the light management layer is 70-130 DEG C, the light management layer comprises a perylene black surface layer and a white light reflecting layer which are sequentially arranged, the visible light absorptivity of the perylene black surface layer is larger than or equal to 90%, and the infrared light transmittance of the perylene black surface layer is larger than or equal to 50%; the melting point of the mechanical transition layer is 90-130 DEG C; and the melting point of the insulating support layer is 120-180 DEG C. According to the invention, the high transmittance of infrared light is maintained while the deep black appearance is realized, the secondary absorption of the infrared light can be realized, and the overall efficiency of the assembly is improved.

A composite material combined layer wall plate structure suitable for combined connection of wings comprises a main box section skin and a plurality of reinforcing ribs which are integrally cured and formed, the front edge and the rear edge of the main box section skin are sequentially provided with recesses, and a front sunken edge for lap joint of the front edge skin and a rear sunken edge for lap joint of the rear edge skin are formed; a front beam reinforcing rib used for being connected with a front spar web is fixedly arranged at the bottom of the transition area of the front sunken edge and the main box section skin body, and a rear beam reinforcing rib used for being connected with a rear spar web is fixedly arranged at the bottom of the transition area of the rear sunken edge and the main box section skin body. The connecting mode of the wall plate and a related structure is simplified, the number of parts is reduced, the assembling efficiency can be improved, and dismounting, replacing and maintaining of an airplane in the using and maintaining process are facilitated.

The invention relates to the technical field of advertisement display, decorative materials and environment-friendly materials, in particular to a degradable advertisement inkjet film and a preparation method thereof.The degradable advertisement inkjet film comprises a glittering ink absorption layer, a degradation starting layer and a main body layer arranged between the glittering ink absorption layer and the degradation starting layer; 1%-2% of an ultraviolet light absorber; and the like. According to the degradable advertisement jet drawing film, by means of the three-layer structural design, the perfect combination of the advertisement effect and environment-friendly degradation is achieved, the flash ink absorption layer provides the unique visual effect, meanwhile, the graphene nanosheet modified titanium oxide photocatalytic layer can catalyze the degradation process under illumination, the main body layer guarantees the mechanical and printing performance of the film, and the degradable advertisement jet drawing film has the good application prospect. And the degradation starting layer realizes rapid degradation through a microbial enzyme complex, and particularly, the graphene nanosheet modified titanium oxide photocatalytic layer is used as a key technology, so that the degradation rate of the advertisement film is remarkably improved.

The invention provides an antistatic polypropylene material as well as a preparation method and application thereof, and belongs to the technical field of polypropylene materials. The preparation method comprises the following steps: modifying graphene, preparing a graphene / titanium dioxide compound, reacting, and performing extrusion molding. The method comprises the following reaction steps: putting a functionalized graphene / titanium dioxide compound into a reaction container, introducing N, N-dimethylformamide, uniformly stirring, adding modified graphene, dicyclohexylcarbodiimide and 4-dimethylaminopyridine, heating to 73-77 DEG C, carrying out ultrasonic treatment, and after ultrasonic treatment is finished, carrying out heat preservation stirring for 1.8-2.2 hours to obtain the graphene / titanium dioxide composite material. Then heating to 116-123 DEG C at the speed of 1.7-2.3 DEG C / min, stirring for 1.8-2.2 hours while keeping the temperature, after stirring is finished, filtering, washing, freeze-drying, and naturally recovering to room temperature, so as to obtain a graphene-graphene / titanium dioxide compound; the antistatic polypropylene material prepared by the invention is good in antistatic property, excellent in mechanical property and good in aging resistance.

The invention belongs to the technical field of power supply cable design and processing, and particularly relates to a high-thermal-conductivity multi-layer structure cable which comprises an insulation shielding wire core, and the insulation shielding wire core comprises a conductor wire core, an insulation layer tightly wrapping the conductor wire core and a shielding layer tightly wrapping the insulation layer. The cable further comprises an outer sheath layer tightly wrapping the insulation shielding wire cores. Wherein modified heat-conducting carbon fibers are dispersed and doped in the outer sheath layer, and stable chemical connection exists between the heat-conducting carbon fibers, so that improvement of the heat conduction effect of the sheath is facilitated; and the insulating layer and the outer sheath layer are formed by melting a resin mixture, directly extruding the resin mixture on the surface of the inner layer and then cooling, so that the contact tightness between the layers is ensured, and the continuity of heat conduction is ensured.

The invention discloses a production and preparation method of a high-temperature-resistant steel bar for an automobile axle, and the high-temperature-resistant steel bar comprises the following chemical components in percentage by mass: 0.39-0.42% of C, 0.22-0.30% of Si, 1.45-1.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.006% of S, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Ni, less than or equal to 0.05% of Mo, less than or equal to 0.10% of Cu and the balance of iron and inevitable impurities. Comprising the steps of ecological electric furnace smelting, LF refining, RH refining, continuous casting, annealing process, heating process, rolling process and heat preservation process. The quality requirement of the steel bar for the automobile axle is met, and the indexes such as the mechanical property and the high steel purity can also meet the standard requirement.

The invention discloses a modified asphalt composition, a preparation method thereof and a modified asphalt waterproof coiled material. The modified asphalt composition comprises the following raw material components in parts by weight: 40-50 parts of composite asphalt; 8 to 10 parts of softening oil; 5 to 7 parts of SBS (Styrene Butadiene Styrene); 1 to 1.5 parts of carbon fiber; 10 to 15 parts of rubber powder; 1-2 parts of an auxiliary agent; 15 to 25 parts of a filling material; wherein the carbon fibers and the SBS are interwoven to form a modified network, and the mass ratio of the carbon fibers to the SBS is 1: (4-6); the mass ratio of the carbon fibers to the composite asphalt is 1: (27-40); the mass ratio of the carbon fiber to the auxiliary agent is 1: (0.7-2). According to the modified asphalt composition, through the synergistic effect of the composite asphalt, the carbon fibers and the SBS, the mechanical property of the modified asphalt composition is guaranteed, meanwhile, the high-temperature stability of the modified asphalt composition is improved, and the influence on a waterproof material during thermal pavement of a pavement or a bridge deck can be effectively resisted.

The invention provides a locomotive battery replacement protection system and a battery replacement method. The protection system comprises a battery replacement control switch, a battery locking mechanism and a locomotive parking brake mechanism. The battery replacement control switch controls the on and off of the replacement operation of the battery, and the battery replacement control switch is mechanically interlocked with a power system switch of the locomotive. And the battery locking mechanism can be switched between a locking position and an unlocking position, and the battery changing control switch controls switching of the battery locking mechanism. The locomotive parking brake mechanism is connected with the battery locking mechanism and can be switched between a parking brake releasing position and a parking brake implementing position, and when the battery locking mechanism is located at the locking position, the locomotive parking brake mechanism is located at the parking brake releasing position; and when the battery locking mechanism is in the unlocking position, the locomotive parking brake mechanism is in the parking brake implementation position.

The invention discloses an anti-aging and anti-yellowing foaming polyester material and a preparation method thereof, and relates to the technical field of polyester materials. The anti-aging and yellowing-resistant foamed polyester material is prepared from the following raw material components in parts by weight: 3 to 5 parts of anti-ultraviolet SEBS (Styrene-Ethylene-Butylene-Styrene), 3.6 to 7 parts of triethylamine, 4 to 6 parts of flame-retardant and wear-resistant filler, 100 parts of TPEE (Thermoplastic Polyether Ester Ether), 0.9 to 1.1 parts of polymer wax and 0.6 to 0.8 part of foaming agent, the anti-ultraviolet SEBS is obtained by copolymerizing and grafting an unsaturated benzophenone ultraviolet absorbent, SEBS and maleic anhydride; the flame-retardant and wear-resistant filler is obtained by mixing and reacting carboxylated nano silicon dioxide, pentaerythritol and phosphorus oxychloride; the polymer wax adopts EVA (Ethylene Vinyl Acetate) wax; azodicarbonamide is adopted as the foaming agent; the anti-aging and anti-yellowing foaming polyester material disclosed by the invention is relatively good in mechanical property, anti-aging property, flame retardant property and compression resistance.

The invention relates to an integrated carbon / carbon composite material crucible containing a pyrolytic carbon transition coating, and belongs to the technical field of thermal field parts for monocrystalline silicon. The crucible comprises a carbon / carbon composite material crucible body, a glassy carbon coating, a pyrolytic carbon transition coating and an yttrium oxide coating, wherein the glassy carbon coating not only has a good combination effect with the carbon / carbon composite material crucible body, but also can prevent carbon from escaping; the thermal expansion coefficient of the pyrolytic carbon transition coating is close to that of the glassy carbon coating, and the combination effect of the pyrolytic carbon transition coating and the yttrium oxide coating is good; the yttrium oxide coating has excellent thermal stability and excellent silicon erosion resistance, and can ensure the purity of molten silicon in the single crystal drawing process; the carbon / carbon composite material crucible body is formed by densifying a carbon fiber prefabricated body which is formed by needling and laying a pure net tire sprayed with resin, and the inner surface of the carbon / carbon composite material crucible body is a net tire which is wholly approximately isotropic, so that the overall mechanical strength of the crucible can be ensured, and a good combination effect of the crucible and a subsequent functional coating can also be ensured.

An electrical connector includes a body having a plurality of terminal holes and a plurality of terminals housed within corresponding terminal holes. The body has an upper surface and a lower surface, with the terminal holes penetrating both surfaces. Each terminal includes a first terminal piece and a second terminal piece, independent of each other. The first terminal piece includes a first fixing portion fixed to the body and a first elastic arm extending upward from the upper surface of the body. The first elastic arm has a chip contact portion and a first overlapping portion extending downward. The second terminal piece includes a second fixing portion fixed to the body and a second overlapping portion extending upward. When the first elastic arm is forced to move downward, it causes the first overlapping portion to move until the first overlapping portion contacts the second overlapping portion, forming a conductive path. The terminal of the present invention is composed of two independent terminal pieces and can form two conductive paths, improving high-frequency performance while ensuring mechanical performance.

The invention discloses cation modified polyimide resin and a preparation method thereof, and the preparation method comprises the following steps: S1, mixing a dianhydride monomer with a polar solvent, adding a cation diamine monomer, and stirring to obtain a polyamide acid solution; and S2, adding an organic alkali and a dehydrating agent into the polyamide acid solution, heating, stirring, adding the reaction solution into an alcohol solvent to separate out a precipitate, collecting the precipitate, washing, and drying to obtain the cation modified polyimide resin, the side chain of which contains an imidazole cation modified group, and the cation modified polyimide resin has good hydrophilic performance and mechanical property.

The invention relates to a ceramic-based composite material / environmental barrier coating bonding layer integrated preparation method, which is characterized in that an EBC bonding layer is introduced in the preparation process of a composite material through dipping-curing-cracking process treatment, so that the composite material is prevented from being subjected to high temperature again, the mechanical property of the composite material is ensured, and the preparation efficiency of a coating is improved; a SiBCX ceramic coating is prepared on the surface of a composite material by adopting a ceramic precursor containing silicon and boron, and an EBC coating bonding layer with the thermal expansion coefficient close to that of the composite material is formed. The bonding layer is prepared from the ceramic precursor, so that thermal mismatching of the bonding layer can be effectively avoided, the temperature resistance level of the environmental barrier coating is improved, and meanwhile, the preparation efficiency of the environmental barrier coating can also be improved.

The invention relates to the technical field of composite material modification, and discloses a flame-retardant epoxy resin composite material with a low candlewick effect and a preparation method thereof.The flame-retardant epoxy resin composite material is prepared by mixing flame-retardant modified glass fibers and a resin component according to the mass ratio of 7.5-8: 2-2.5; the resin component comprises the following raw materials in parts by mass: 90.4-97.4 parts of epoxy resin, 0.6 part of a curing agent, 2 parts of a release agent and 0-7 parts of a flame retardant; the flame-retardant modified glass fiber is obtained by sequentially carrying out amination modification and flame-retardant modification on glass fiber. The glass fiber is subjected to amination modification and then subjected to flame retardant modification, a flame retardant DOPO-PH is applied to modification of the glass fiber for the first time, and DOPO-PH can be self-crosslinked to form carbon at a relatively low temperature and is crosslinked with pyrolysis micromolecules of a polymer material at a high temperature to generate a carbon layer with high thermal stability; the glass fiber material modified by the technical scheme has a good candlewick effect inhibiting effect, the use amount of the flame retardant can be further reduced, the production efficiency is improved, and the mechanical property is kept.

The invention relates to the field of environment-friendly building materials, and particularly discloses a construction waste regenerated insulating brick and a preparation method thereof. The construction waste regenerated insulating brick is prepared from the following raw material components in parts by mass: 80 to 95 parts of construction waste regenerated filler, 60 to 65 parts of composite insulating carbon fiber material, 15 to 35 parts of waste ceramic aggregate, 5 to 10 parts of mica modified rubber particles, 5 to 30 parts of binder and 30 to 40 parts of water. According to the invention, the composite thermal insulation carbon fiber material is used as a skeleton, and the construction waste regenerated filler, the waste ceramic aggregate and the mica modified rubber particles are used as filling materials to fill the skeleton, so that the regenerated thermal insulation brick which has thermal insulation performance and can guarantee mechanical properties is prepared. The problems that in the prior art, construction waste regenerated building materials are weak in mechanical property and poor in compatibility with functional materials, and the requirements of the functional building materials cannot be met are effectively solved.

The invention relates to the technical field of epoxy adhesives, in particular to a room-temperature-curing high-temperature-resistant heat-conducting epoxy adhesive and a preparation method thereof. Comprising a component A and a component B. The component A comprises, by weight, 60-135 parts of epoxy resin, 10-30 parts of a flexibilizer, 30-85 parts of a filler and 2-15 parts of an auxiliary agent, and the component B comprises, by weight, 40-90 parts of an amine curing agent, 10-30 parts of high-temperature-resistant resin, 30-60 parts of a filler and 2-12 parts of an additive. The epoxy resin comprises bisphenol A epoxy resin, novolac epoxy resin, polyurethane modified resin and multifunctional epoxy resin. The product has good mechanical properties and excellent temperature resistance, and the toughening agent and the resin powder are reasonably matched to ensure that the product has excellent impact resistance and temperature resistance. A plurality of amine curing agents are reasonably matched, so that the product can be cured at room temperature and used at high temperature, and meanwhile, the temperature resistance of the product is further improved by adding the high-temperature-resistant resin.

The invention belongs to the technical field of metal pipe machining, and particularly relates to a preparation method of a large-size high-purity molybdenum-rhenium alloy pipe. According to the method, the large-size high-purity molybdenum-rhenium alloy pipe is prepared through the steps of (1) molybdenum-rhenium alloy ingot blank high-purity preparation, (2) surface turning, (3) molybdenum-rhenium alloy pipe blank high-speed near-isothermal extrusion, (4) high-temperature spinning forming, (5) recrystallization annealing treatment, (6) surface finish machining treatment and the like. According to the large-size molybdenum-rhenium alloy pipe prepared through the method, the mode of controlling the electron beam scanning track is adopted, the electron beam power during raw material melting and refining is reasonably distributed, the ingot casting specification of molybdenum-rhenium alloy is improved, a high-purity ingot blank is obtained, the mode of combining high-speed near-isothermal extrusion and high-temperature spinning is adopted, and the large-size molybdenum-rhenium alloy pipe is obtained. And the deformation uniformity of the molybdenum-rhenium alloy pipe is improved, the comprehensive performance of the molybdenum-rhenium alloy pipe is improved, and good application prospects and economic benefits are achieved.

The invention discloses a preparation method of an ultra-smooth nanocrystalline tungsten coating on the surface of an emitter, the tungsten coating is prepared by adopting a magnetron sputtering method, and the specific process is as follows: pretreating an emitter workpiece, then placing the emitter workpiece in a vacuum chamber, pre-vacuumizing, then introducing inert gas, cleaning the surface of the emitter workpiece by utilizing gas ion reverse sputtering, and finally removing the surface of the emitter workpiece. And then adjusting the gas pressure, bombarding and cleaning the surface of the emitter workpiece by using metal ions, and finally sputtering and depositing to form the tungsten coating. The tungsten coating is prepared through the magnetron sputtering technology, the tungsten coating has the characteristics of being compact in structure, good in combination and uniform and smooth in surface, the mechanical property and structural stability of the tungsten coating in the high-temperature service environment can be guaranteed, the deposition technology is simple, the preparation efficiency is high, and the tungsten coating is green and free of pollution, in addition, preparation of the tungsten coating composed of different phases can be achieved, and the application prospect is wide. The application requirements in the fields of electronic industry, nuclear industry and the like are met.

The invention belongs to the technical field of alumina ceramic preparation, and particularly relates to microcrystalline wear-resistant alumina ceramic and a preparation method thereof. The microcrystal wear-resistant aluminum oxide ceramic is prepared from the following raw materials: fused corundum powder, gibbsite, diopside, calcium fluosilicate, neodymium oxide, nickel aluminate, strontium oxide and sodium tripolyphosphate. According to the microcrystal wear-resistant aluminum oxide ceramic disclosed by the invention, the fused corundum powder and the gibbsite are used as main raw materials, so that the mechanical property of the prepared aluminum oxide ceramic is fundamentally ensured; diopside and calcium fluosilicate are used as fluxing agents, so that the firing temperature of the aluminum oxide ceramic is reduced, and the compactness is improved; neodymium trioxide, nickel aluminate and strontium oxide are used as wear-resistant assistants, and the wear resistance of the aluminum oxide ceramic is improved by improving the microstructure of the aluminum oxide ceramic, avoiding stress concentration at a grain boundary and generating a second reinforcement phase under the synergistic effect of the three assistants. Therefore, it is ensured that the prepared aluminum oxide ceramic has excellent wear resistance.

The invention discloses a composite current collector, and belongs to the technical field of current collectors, and the composite current collector comprises a supporting layer which is a porous supporting layer and is internally provided with a plurality of holes; the conductive layer is attached to the surface layer of the supporting layer; the filling layer comprises a phase change layer and a sealing layer arranged on the outer side of the phase change layer; an expansion buffer area exists on the side face of the phase change layer so that a buffer area can be provided during solid-liquid phase change. The composite current collector can improve the problem of volume expansion caused by phase change.

The invention relates to the technical field of flame-retardant nylon materials, and provides a halogen-free flame-retardant nylon material and a preparation method thereof, the halogen-free flame-retardant nylon material comprises the following components by mass: 80-120 parts of nylon, 30-40 parts of modified polyacrylate, 1-10 parts of modified nylon, 20-40 parts of a halogen-free flame retardant, and 0.1-5 parts of an auxiliary agent; the modified polyacrylate is a copolymer of phosphorus pentoxide, hydroxyl acrylate, acrylic acid, acrylate, glass fiber and antimony trioxide; the modified nylon is a copolymer of nylon and acrylate. The components have good affinity, a uniform and stable mixed system can be formed, the mechanical strength and flame retardant property of the nylon composite material can be obviously improved by introducing the components, the product is endowed with more excellent comprehensive performance, harm to the environment and human bodies can be avoided, the ecological friendliness is higher, and the nylon composite material is suitable for industrial production. The problems existing in the prior art are solved, and the method has important significance on development and further popularization of nylon products.

The utility model discloses a novel photovoltaic assembly end portion pressing block assembly, comprising an upper portion pressing block and a lower portion pressing block, at least part of the end portion of the upper portion pressing block is contacted with the outer side end face of the top of a purline, and the lower portion pressing block is provided with a first contact portion contacted with the inner side end face of the top of the purline. Connecting holes are formed in the upper pressing block and the lower pressing block, the upper pressing block and the lower pressing block are locked to the top of the purline through connecting bolts, after the upper pressing block and the lower pressing block are locked, the ends, away from the purline, of the upper pressing block and the lower pressing block abut against each other, and a connecting part connected with a photovoltaic module is further arranged on the upper pressing block; different from a traditional photovoltaic module end portion pressing block, the novel photovoltaic module end portion pressing block is additionally provided with the lower pressing block, the photovoltaic module can be clamped on the photovoltaic support purline without forming holes in the photovoltaic support purline again, and the novel photovoltaic module end portion pressing block is particularly suitable for a built module needing to be reinforced.

The application relates to the technical field of zirconium-niobium alloy material processing, in particular to a preparation method of a large-diameter zirconium-niobium alloy pipe for nuclear industry, which comprises the following steps: S1, mixing nuclear-grade sponge zirconium and niobium scraps, or mixing zirconium-niobium alloy, zirconium dioxide and iron; melting the mixture and preparing a zirconium-niobium alloy ingot; S2, sequentially performing large deformation forging in a beta single-phase zone and an alpha+beta two-phase zone; S3, drilling a central hole in the axial direction of a round-forging blank; quenching in the beta single-phase zone; S4, coating an anti-galling agent on the surface of the central hole and heating to prepare a pipe blank in the mode of cross piercing; S5, performing periodic forging and rolling on the pipe blank; S6, annealing the hot-rolled pipe twice; and straightening the hot-rolled pipe after the second-stage annealing. The zirconium-niobium alloy pipe has uniform microstructure, good mechanical properties and corrosion resistance, the production direction of the brittle hydride is nearly parallel to the circumferential direction of the pipe, and brittle damage of the pipe wall thickness caused by the crack propagation of the hydride is avoided.

The invention belongs to the technical field of grinding wheel abrasives, and particularly relates to a diamond porous microsphere, a grinding wheel abrasive and a preparation method and application thereof. The preparation raw materials of the diamond porous microspheres comprise mixed powder, a binder and water, the mixed powder comprises a first ceramic bond, diamond and a pore forming agent. The first ceramic bond, the diamond and the pore forming agent are used as raw materials for preparing the diamond porous microspheres, the diamond porous microspheres have natural pores and prefabricated spherical pores, the porosity is high, and the self-sharpening performance of the grinding wheel grinding material can be improved; the grinding wheel abrasive material is prepared through secondary air degreasing sintering of the diamond porous microspheres, a new three-dimensional pore structure is formed among the naturally stacked diamond porous microspheres, the grinding wheel abrasive material with a'natural pore + prefabricated spherical pore + stacked pore 'multi-stage pore structure is obtained, the cooling, lubricating and chip removal effects of a grinding wheel can be greatly improved, and the service life of the grinding wheel is prolonged. Therefore, the grinding performance and the service life of the grinding wheel are improved.

This invention relates to the field of ultra-high performance concrete (UHVPC) curing technology, and more particularly to an intelligent temperature-controlled curing method for UHVPC. The method includes the following steps: generating preliminary temperature-controlled curing data for concrete based on UHVPC mix proportion parameters and temperature-controlled curing requirements data; analyzing the distributed temperature field characteristics of the pouring nodes using UHVPC pouring node data to generate distributed temperature field characteristic data for the pouring nodes; analyzing the temperature evolution and hydration state of the pouring node temperature field based on the distributed temperature field characteristic data and the preliminary temperature-controlled curing data to generate temperature evolution and hydration regulation state data; and performing dynamic temperature-controlled curing analysis on the preliminary temperature-controlled curing data to generate dynamic temperature-controlled curing data for the concrete. This invention achieves intelligent temperature-controlled curing by combining the application of UHVPC.

The invention relates to the technical field of composite materials, in particular to a breathable TPU non-woven fabric composite material and a preparation method and application thereof.The breathable TPU non-woven fabric composite material comprises a surface layer and a TPU hot melt adhesive net film layer arranged on the surface layer, and the TPU hot melt adhesive net film layer is formed by conducting velvet spraying on composite TPU hot melt adhesive particles through a velvet spraying technology; the composite TPU hot melt adhesive particles comprise the following raw materials in parts by weight: 70-100 parts of TPU hot melt adhesive particles, 3-7 parts of an antibacterial agent, 0-10 parts of color master batches, 1-5 parts of an anti-ultraviolet additive and 4-10 parts of a foaming agent. The breathable TPU non-woven fabric composite material has good breathability and antibacterial performance, meanwhile, the skin-friendly performance of the composite material is effectively improved, the mechanical performance, breathability and degradable effect of the composite material are guaranteed, and the environmental protection performance is improved.

This utility model relates to the field of construction, specifically a steel plate connection structure for primary and secondary beams. The secondary steel-concrete composite beams are symmetrically arranged on both sides of the primary steel-concrete composite beam, forming a cross-shaped arrangement. The primary steel-concrete composite beam is horizontally fitted with upper and lower flange connecting plates, corresponding to the heights of the upper and lower pipe walls of the secondary steel-concrete composite beams, respectively. The two end faces of the upper and lower flange connecting plates support the upper and lower pipe walls of the secondary steel-concrete composite beams from bottom to top. This utility model significantly improves the construction efficiency of connecting primary and secondary beams and has a simple structure.

The invention discloses a halogen-free flame-retardant ABS (Acrylonitrile Butadiene Styrene) material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The halogen-free flame-retardant ABS material comprises ABS resin, SAN (Styrene Acrylonitrile Butadiene Styrene) resin, a halogen-free flame retardant and a laser marking agent, the melt flow rate of the ABS resin under the conditions of 220 DEG C and 10 kg is 15-40 g / 10 min, and the impact strength is 15-27 KJ / m < 2 >; the melt flow rate of the SAN resin under the conditions of 220 DEG C and 10kg is less than or equal to 40g / 10min. Under the synergistic effect of all the raw material components, the material has high pencil hardness and high glossiness and has a good laser marking effect, and marks are not prone to being abraded and can be kept for a long time.