4726 results about "Mechanical strength" patented technology

The invention discloses a high-bonding-strength flame-retardant composite current collector base film and a preparation method thereof. The high-bonding-strength flame-retardant composite current collector base film is prepared from the following raw materials in parts by weight: 100 parts of PP resin, 1.5 parts of a lubricant, 0.8 part of an antioxidant and 16 parts of reinforced flame-retardant composite particles, the reinforced flame-retardant composite particles are prepared by the following steps: S1, preparing amidated porous carbon microspheres; s2, compounding the amidated porous carbon microspheres with mica powder to prepare a composite carrier; s3, loading a flame retardant to prepare a flame-retardant compound; s4, in-situ grafting of maleic anhydride grafted polypropylene is carried out, and the reinforced flame-retardant composite particles are obtained. By adding the reinforced flame-retardant composite particles into the PP resin, the flame retardance and mechanical strength of the PP-based composite current collector base film and the interface bonding force between the PP base film and the metal conductive layer can be comprehensively improved.

The invention discloses a preparation method of an interface-modified flame-retardant polypropylene-based bamboo-plastic composite material. According to the method, a modification solution composed of a polyphenol component and a boron-containing component is adopted, bamboo powder is treated under the normal-temperature stirring condition, and the interface modified bamboo powder is successfully prepared. The mechanism is that polyphenol and a boron-containing component are subjected to a coordination reaction on the surface of bamboo powder, and a reversible borate dynamic covalent bond is constructed. The dynamic bond has a temperature response characteristic: reversible dissociation is realized during high-temperature processing, so that the melt viscosity of a composite system is reduced, and the processing fluidity is improved; the interface bonding force between the bamboo powder and the polypropylene matrix and the mechanical strength of the composite material are remarkably enhanced. In addition, the introduced boron element is used as an efficient flame-retardant component and promotes generation of a compact protective carbon layer during combustion, so that the flame-retardant property of the composite material is comprehensively improved.

The invention provides a manufacturing method of an MEMS device and the MEMS device, and the manufacturing method comprises the steps: providing a first wafer which is provided with a groove; a protective layer is arranged in the groove; providing a second wafer, and bonding the second wafer and the first wafer to seal the groove to obtain a first cavity; the second wafer is etched to form a comb tooth structure, and the protection layer is used for protecting the comb tooth structure. According to the embodiment of the invention, the protection layer is arranged in the first cavity of the first wafer as a buffer layer, so that when the second wafer is etched to form the comb tooth structure, the plasma backwash in the over-etching stage can be reduced, the comb tooth structure is further protected, the damage to the bottom of the comb tooth caused by the backwash of etching particles is reduced and solved, and the service life of the comb tooth structure is prolonged. Therefore, the mechanical strength and the anti-failure capability of the device are enhanced.

The invention relates to the technical field of cementing materials, in particular to an early-strength type freeze-thaw cycle-resistant cementing material and a preparation method thereof. The cementing material comprises the following raw materials in parts by mass: 50 parts of steel slag, 32-42 parts of blast furnace slag, 11-17 parts of desulfurized gypsum, 22-30 parts of fly ash, 3-5 parts of calcium chloride, 4-7 parts of a composite alkali activator and 11-17 parts of an interface treating agent. Through the combined action of the composite alkali activator and the interface treating agent, the mechanical strength and the freeze-thaw cycle resistance of the cementing material are improved at the same time, and particularly, the early strength and the freeze-thaw cycle resistance are improved at the same time, so that the cementing material can be applied to high-humidity and cold regions.

The invention discloses a lithium battery diaphragm with a self-repairing function and a preparation method thereof, and belongs to the field of lithium battery diaphragms. The lithium battery diaphragm comprises a polymer base membrane and a ceramic coating, the ceramic coating is coated on one side surface, facing the negative electrode, of the polymer base membrane or two side surfaces of the polymer base membrane; the ceramic coating comprises the following raw materials in parts by mass: 40-50 parts of modified ceramic particles, 4-8 parts of self-repairing microcapsules, 0.5-3 parts of a dispersing agent and 50-60 parts of water; the surfaces of the modified ceramic particles are grafted with amino-phenylboronic acid difunctional silane; chitosan / polyurethane is used as a wall material of the self-repairing microcapsule, and polyisocyanate is used as a core material of the self-repairing microcapsule. When the lithium ion diaphragm is stressed or punctured by dendritic crystals, the polyisocyanate can be released to react and crosslink, the generated cracks are closed, and an ion channel is reconstructed. Through the physical barrier of the ceramic coating and the self-repairing effect of the self-repairing microcapsule, the mechanical strength and the ion transmission performance of the lithium battery diaphragm can be effectively maintained.

The invention relates to a modified chrome corundum ramming material and a preparation and construction process thereof, and belongs to the technical field of chrome corundum ramming materials. The ramming material comprises a material A, a material B and a material C, wherein the material A comprises chrome corundum aggregate, titanium dioxide coated aluminum oxide microspheres, calcium sulfide dehydrate and silicon carbide porous microspheres; the material B comprises chromium oxide-zirconium oxide composite nano powder, sodium thiosulfate pentahydrate, tricalcium phosphate and hexagonal boron nitride flaky crystals; and the material C comprises an aluminum dihydrogen phosphate-magnesium hydroxide compound, a calcium fluoride-aluminum oxide co-melt and a silane coupling agent. The preparation process comprises the steps of pretreatment of all the components, preparation of composite powder and layered preparation. The construction process comprises the steps of pretreatment, wet-process mixing, layered ramming, negative-pressure permeation, medium-temperature reaction, spraying curing, integral firing and the like. Generation of hexavalent chromium can be effectively inhibited, the thermal shock resistance, the mechanical strength and the heat-conducting property of the material are remarkably improved, and the material has the advantages of being good in environment friendliness, long in service life, excellent in construction performance and the like.

The invention discloses a composition based on hollow glass beads and a preparation method thereof, and relates to the technical field of material science. The preparation method comprises the following steps: firstly, constructing a pre-composite functional microsphere with a specific hierarchical structure as a core basic functional unit, then matching with a plurality of components such as a thermosetting resin matrix, a latent curing system, a functional synergistic aid package and a composite solvent system, and matching with a preparation process which has a synergistic effect with the components. The composition based on the hollow glass beads is expected to realize uniform dispersion of the hollow glass beads in a coating system and strong bonding of a microscopic interface on the premise of ensuring the structural integrity of the hollow glass beads. Therefore, the high-performance composite coating material with ultra-light weight, high heat insulation efficiency, excellent mechanical strength and long-term service stability is obtained.

The invention discloses a light telegraph pole cement material and a preparation method thereof, and relates to the technical field of cement concrete. The method comprises the following steps: firstly, carrying out acid pickling, silane coupling agent grafting and nanoparticle vacuum impregnation treatment on shale ceramsite to obtain modified light ceramsite; the preparation method comprises the following steps: ultrasonically dispersing graphene oxide, compounding with Portland cement clinker and modified fly ash, and reacting with epoxy resin emulsion, a curing agent and a silane coupling agent to prepare organic-inorganic composite modified cement; the bamboo skeleton is subjected to silane coupling agent pretreatment to obtain a modified skeleton; then, mixing composite cement, an additive and water into slurry, adding the modified ceramsite and aggregate, and performing high-speed stirring and ultrasonic dispersion to form homogeneous concrete slurry; and finally, putting the modified bamboo skeleton into a mold, injecting the slurry, and performing centrifugal forming, steam curing and natural curing to obtain the cement material. The prepared lightweight telegraph pole cement material has excellent mechanical strength.

The invention discloses an anti-aging flame-retardant polyvinyl chloride material and a preparation method thereof. The anti-aging flame-retardant polyvinyl chloride material comprises the following raw material components in parts by weight: 100 parts of PVC resin, 0.6-2.4 parts of a lubricant, 15-27 parts of a plasticizer and 14-25 parts of a composite flame-retardant anti-aging reinforcing filler, wherein the composite flame-retardant anti-aging reinforcing filler is obtained by sequentially carrying out antioxidant loading and polymer grafting modification on a compound of graphene oxide, basic magnesium sulfate whiskers and mesoporous alumina. The prepared polyvinyl chloride has excellent aging resistance, flame retardance and mechanical strength, is good in thermal stability and excellent in comprehensive performance, and has a wide market application prospect.

The invention provides spin-drying and cleaning integrated equipment and a spin-drying and cleaning method.The spin-drying and cleaning integrated equipment comprises a spin-drying device, the spin-drying device is suitable for spin-drying a printing model, the spin-drying device is loaded with a spin-drying barrel when in a spin-drying state, and the printing model is suitable for being placed in the spin-drying barrel to be spin-dried; the cleaning device is suitable for cleaning the spin-dried printing model, the cleaning device comprises a plurality of cleaning loops, the cleaning device is loaded with a cleaning barrel in a cleaning state, the printing model is suitable for being placed in the cleaning barrel to be cleaned, and the cleaning barrel communicates with the plurality of cleaning loops; the cleaning loops are suitable for injecting cleaning liquid into the cleaning barrel and recycling the cleaning liquid, and the cleaning liquid of at least two cleaning loops is different. According to the spin-drying and cleaning integrated equipment and the spin-drying and cleaning method, the spin-drying and cleaning effect of the printing liquid medicine on the printing model can be greatly improved, and it is ensured that the smoothness, the detail precision and the mechanical strength of the printing model meet the design requirements.

The invention provides an embedded structure energy storage integrated composite material and a preparation method thereof, and belongs to the technical field of composite materials and electric energy storage. A sandwich structure is adopted, an energy storage unit is embedded in an insulation honeycomb / grid core material, and high-strength fiber composite material panels are arranged on the upper side and the lower side of the insulation honeycomb / grid core material. In the aspect of a material system, the panel has both mechanical strength and electrical insulation property; in structural design, gradient thickness and multi-cavity layout are introduced to improve the multi-direction load bearing capacity. Automatic switching, energy management and fault diagnosis among the energy storage units are realized by a flexible circuit and an intelligent chip which are internally integrated; meanwhile, a sensing network is embedded to monitor structural strain, vibration and battery state in real time, and a structural health monitoring function is provided. The obtained composite material has the characteristics of high structural strength, high energy storage efficiency and high safety intelligent degree, can be widely applied to the fields of aerospace, automobiles and the like, realizes the integrated design of the structure and energy storage, and achieves the purposes of reducing weight and improving functions.

The invention belongs to the technical field of radar stealth materials and high-temperature electromagnetic protection, and particularly relates to design and a preparation method of a high-temperature-resistant wave-absorbing material based on alumina fibers. According to the material, a high-temperature-resistant ceramic precursor serves as a base body, a reinforcing phase is formed by alternately stacking alumina fiber cloth and an alumina fiber web tire containing chopped silicon carbide fibers, and a three-dimensional reinforcing structure is formed through a needling technology; the chopped silicon carbide fibers are directionally distributed in the net tire in a non-uniform mode, an enhanced area array with the local geometric regular pattern is constructed, the size and the arrangement period change in a gradient mode in the thickness direction, a vertical dielectric gradient structure is formed in the material, and multi-path propagation, reflection and polarization loss of electromagnetic waves are improved; the surface of alumina fiber cloth is coated with a ceramic interface layer, so that the interface bonding strength and thermal stability are improved; the ceramic matrix is densified for multiple rounds, so that the structure is compact; the material has excellent electromagnetic absorption performance, heat resistance and mechanical strength, and is suitable for high-temperature electromagnetic environments such as aerospace, missile bay sections and the like.

The invention relates to an impact-resistant chlorinated polyvinyl chloride composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material comprises the following components: 100 parts of CPVC resin, 6.5 to 9.5 parts of a modified impact modifier, 2.6 to 3.2 parts of a heat stabilizer, 1.5 to 2 parts of a lubricant, 1.2 to 1.6 parts of a processing aid, 0.2 to 0.25 part of a light stabilizer and 8 to 11 parts of a filler, the modified impact modifier takes a POSS cage structure as a core, a branch chain sequentially contains thioamide-secondary amine-tertiary amine structures, a polarity gradient is formed and fully extends into a macromolecular chain of CPVC to transmit and dissipate impact energy, meanwhile, the amine structure interacts with chlorine groups in a molecular chain of CPVC to form molecular anchoring, expansion of crazes is inhibited, and the impact strength of the CPVC is improved. The continuity and the stability of a bonding interface are maintained, so that the composite material keeps relatively high mechanical strength and thermal stability.

The invention discloses a preparation method of a high-temperature-resistant high-strength polyimide composite material, and relates to the technical field of polyimide composites.The preparation method comprises the following preparation steps that S1, a customized silane coupling agent is prepared; s2, preparing a bionic dynamic interface modified reinforcing filler, wherein the modified reinforcing filler is synergistically modified through a bionic coating and a customized silane coupling agent; and S3, preparing a polyimide precursor solution containing the dynamic network. According to the preparation method of the high-temperature-resistant high-strength polyimide composite material, through the integrated design of'customized silane coupling agent + bionic dynamic interface modification + dynamic network-containing polyimide precursor + gradient hot-pressing curing ', the glass-transition temperature of the prepared composite material is greater than or equal to 335 DEG C, the tensile strength is greater than or equal to 208 MPa, and meanwhile, the thermal repair efficiency at 180-250 DEG C is greater than or equal to 87%; the technical bottleneck that high temperature resistance, mechanical strength and repairing performance of the material are difficult to consider at the same time in the prior art is solved.

The invention relates to the field of current collector membranes, in particular to a modified polypropylene base membrane and a preparation method thereof. The modified polypropylene base film is prepared from the following components in parts by weight: 100 parts of polypropylene resin, 5 to 15 parts of modified boron nitride nanosheets, 3 to 8 parts of an interface compatilizer, 10 to 20 parts of modified benzoxazine, 0.2 to 0.5 part of an antioxidant, 0.1 to 0.3 part of an ultraviolet light absorber and 0.2 to 0.5 part of a slipping agent. The modified polypropylene base film is prepared, polypropylene resin is used as a main material, modified boron nitride nanosheets, modified benzoxazine and other auxiliaries are introduced, a stable multi-phase structure is formed, and all the components have a synergistic enhancement effect; compared with a common polypropylene film, the polypropylene film has the advantages that the high temperature resistance, the mechanical strength, the flame retardance and the comprehensiveness are obviously improved.

The invention discloses a preparation method and application of monolithic BiVO4 photocatalytic foamed ceramic. The method comprises the following steps: 1) preparing composite slurry containing BiVO4 powder, an organic additive and a reinforced phase; (2) uniformly attaching the composite slurry to the organic foam skeleton by adopting an impregnation method; 3) performing drying and heat treatment to remove organic components; and 4) performing high-temperature sintering to form the three-dimensional communicated porous structure. Through the structure-function integrated design, the problems that a traditional powder catalyst is difficult to recover, the activity of an immobilized catalyst is low and a supported catalyst is easy to fall off are solved. The obtained product is high in porosity, the compressive strength is larger than or equal to 0.1 MPa, the specific surface area is larger than or equal to 0.1 m < 2 > / g, visible light can be efficiently utilized for degrading emerging organic pollutants in water, and the degradation rate reaches 20-99%. The material has no nano-particle leakage risk, has excellent mechanical strength, chemical stability and engineering applicability, and provides a feasible scheme for large-scale application of a photocatalytic water treatment technology.

The invention relates to the field of plastic films, and particularly discloses a bio-based antibacterial cool-feeling breathable film and a preparation method thereof. The bio-based antibacterial cool-feeling breathable film is prepared from the following raw materials in percentage by weight: 49 to 66.5 percent of matrix resin, 30 to 40 percent of pore-foaming agent, 1 to 3 percent of silane modified cellulose nanofiber, 1 to 2 percent of antibacterial agent, 1 to 5 percent of composite cool-feeling agent and 0.5 to 1 percent of auxiliary agent, the matrix resin comprises PBAT resin and PLA resin in a mass ratio of (7: 3)-(5: 5); the composite cool feeling agent comprises nano aluminum nitride and graphene in a mass ratio of (5-15): 1. The bio-based antibacterial cool-feeling breathable film can be used for medical dressings, disposable medical supplies, mother and baby products and the like, and has the advantages of being good in breathability and moisture penetrability, high in antibacterial capacity, lasting in antibacterial effect, high in mechanical strength, high in cool-feeling coefficient, comfortable to wear and not prone to stuffiness.

The invention relates to the field of current collector films, in particular to a high-temperature-resistant current collector base film and a preparation method thereof. The current collector base film is prepared from the following components in parts by weight: 75 to 85 parts of PET (Polyethylene Terephthalate) resin, 8 to 12 parts of high-temperature-resistant modifier, 5 to 8 parts of silane modified nano silicon dioxide, 0.5 to 1.5 parts of lubricant, 0.5 to 1.5 parts of stabilizer, 1 to 3 parts of nucleating agent and 0.2 to 1 part of antioxidant. According to the current collector base film, PET resin is used as a main material, a high-temperature-resistant modifier and silane modified nano silicon dioxide are added to serve as reinforcing modifiers, and meanwhile other auxiliaries are added. The prepared current collector base film has excellent high-temperature resistance and good mechanical strength, also has better flame retardance and excellent comprehensive performance, and is particularly suitable for preparing a composite current collector for a lithium battery with high safety and long service life.

The invention provides a sidewalk antiskid terrace material and a construction process thereof, and belongs to the technical field of terrace material manufacturing. The sidewalk antiskid terrace material is prepared from the following components: epoxy resin, polysiloxane elastic resin, fluorocarbon resin, modified covalent organic framework nanosheets, boron nitride nanotubes, nano silicon nitride particles, nano silicon dioxide, nano zinc oxide, a modified flame retardant, attapulgite, a curing agent, an accelerant, a flatting agent, a coupling agent and a dispersing agent. According to the sidewalk antiskid terrace material, various high-performance resins are compounded with the nano filler to form a coating with a compact and uniform structure, so that the mechanical strength and wear resistance of the terrace are remarkably improved. In addition, due to the application of the modified flame retardant, the floor has a good flame-retardant effect, and the safety is improved. The whole formula and the construction process are scientific and reasonable, strong adhesion of the coating is ensured, construction is simple and convenient, curing is sufficient, and the coating is suitable for long-term use of outdoor sidewalks and has attractive appearance and practicability.

The invention provides an aluminum alloy cable conductor preparation device and process, the aluminum alloy cable conductor preparation device comprises a bottom plate, and a turntable, a twisting disc, a threading ring and a winding assembly which are arranged on the bottom plate, and a plurality of aluminum alloy wire coils are rotatably mounted on the circumference of the turntable at equal intervals. Through cooperation of the liquid storage cavity, the conical liquid leakage hole and the plugging block in the lubricating cylinder, dynamic adjustment of line-moving liquid supply and line-stopping liquid sealing is achieved, when an aluminum alloy wire penetrates through, the ball is pushed, the plugging block is driven to move, a gap is formed between the plugging block and the liquid leakage hole, and lubricating liquid leaks to the surface of a wire body according to needs; when the wire body is paused, the spring I drives the stop block to reset and is matched with the sealing ring to realize sealing, so that waste of lubricating liquid is avoided; when the twisting disc rotates, the lubricating cylinder is synchronously driven to rotate, the distribution position of lubricating liquid in the liquid storage cavity is changed, the problem that local lubrication is interrupted due to insufficient liquid storage is effectively solved, it is ensured that multiple strands of aluminum alloy wires are evenly lubricated in the whole process, wire body abrasion is reduced, and the surface quality and mechanical strength of a twisted conductor are improved.

The invention relates to the technical field of packaging materials, in particular to a chip inductor packaging material and a preparation method thereof. The packaging material is prepared from epoxy resin serving as a matrix, composite boron nitride modified hollow glass beads, spherical silica powder, a silane coupling agent, a curing agent, an accelerant and a defoaming agent. Wherein the boron nitride modified hollow glass beads are obtained by constructing a boron nitride functional layer through branched polyamidoamine grafting and a melamine-boric acid in-situ method and carrying out high-temperature calcination. By means of the innovative structural design, efficient bonding of a filler interface and ordered construction of a heat conduction path are achieved, the heat conduction performance and the mechanical strength of the composite material are remarkably improved, and the dielectric constant and the dielectric loss are effectively reduced. The packaging material provided by the invention has excellent electrical, thermal and mechanical comprehensive performance, meets the requirements of light weight and high reliability packaging of a new generation of high-performance chip inductor devices, and has important industrialization and application prospects.

This invention discloses a visible-light-responsive dynamically covalently cross-linked self-healing polyurethane and its preparation method, belonging to the field of self-healing materials technology. The material is prepared by reacting diisocyanate, long-chain diol, butanediol, trimethylolpropane, and a monool containing an azophenylboronic acid structure in a certain proportion at 60°C. This invention achieves visible-light-responsive self-healing of the polyurethane material by introducing a visible-light-responsive azophenylboronic acid structure into the polyurethane and utilizing the photoresponsive cis-trans isomerization of the azo structure to regulate the reversible breakage and recombination of the boron-oxygen hexacyclic ring. The visible-light-responsive dynamically covalently cross-linked self-healing polyurethane material prepared by this invention maintains high mechanical strength (16.47 MPa) while exhibiting a strength self-healing efficiency of 95.8% after 8 hours of visible light irradiation, showing broad application prospects in smart materials, anti-corrosion coatings, and other fields.

This invention relates to the field of photovoltaic module technology and discloses a photovoltaic frame and a photovoltaic module. The photovoltaic frame, comprising multiple steel frame strips connected end-to-end in sequence and corner connectors joining steel frame strips adjacent to each other at a corner; wherein each steel frame strip comprises: a first mounting chamber and second mounting chamber, the second mounting chamber includes a fourth steel wall, the top and bottom of the fourth steel wall are bent to connect to the protruding / recessing portion and one side of the fifth steel wall, respectively, and the free end of the fifth steel wall has a bent section; the corner connector comprises a first connecting part and a second connecting part, joined by a bend; the first connecting part comprises a first connecting wall and a second connecting wall connected by a bend, while the second connecting part comprises a third connecting wall and fourth connecting wall connected by a bend; both the first connecting wall and the third connecting wall are vertical or horizontal steel walls, while the second connecting wall and fourth connecting wall can be horizontal or vertical steel walls; the upper end of the vertical steel wall snaps into the protruding / recessing portion, and the horizontal steel wall snaps into a chamber defined by the lower end of the fourth steel wall, the fifth steel wall, and the bent section on the free end of the fifth steelwall. Thus, the mechanical strength and installation stability of the photovoltaic frame can be improved, and the cost can be reduced.

The invention relates to the technical field of lead-acid batteries, and particularly discloses a graphene-based composite material as well as a preparation method and application thereof. The graphene-based composite material comprises a graphene-CNTs three-dimensional composite skeleton, and tin dioxide and titanium dioxide which are loaded on the graphene-CNTs three-dimensional composite skeleton. In the material provided by the invention, the graphene-CNTs three-dimensional composite skeleton has excellent conductivity and mechanical strength, so that the resistivity of a negative plate is remarkably reduced, structural support is provided, and the binding force of lead powder and a negative electrode metal plate grid is enhanced, thereby reducing the falling of active substances and improving the cycling stability of the battery; meanwhile, tin dioxide and titanium dioxide are introduced into the graphene-based composite material and form a multi-stage synergistic system with the graphene-CNTs three-dimensional composite framework, so that the problems that the negative electrode of the lead-acid battery is easy to separate hydrogen, the conductivity is insufficient and active substances fall off can be effectively solved, and the cycle performance of the battery is remarkably improved.

The invention discloses carbon-based material loaded hydrotalcite synergistically modified composite rubber asphalt which comprises the following components in percentage by mass: asphalt, rubber powder, a dispersing agent, a retarder, carbon-based material loaded hydrotalcite, an antioxidant and a heat stabilizer. The carbon-based material loaded hydrotalcite, the antioxidant and the heat stabilizer are compounded, so that the ultraviolet aging resistance, the oxidation aging resistance and the mechanical strength of the composite rubber asphalt can be remarkably improved, the limitation of a single modified material is effectively overcome, and the service life of an asphalt road is greatly prolonged.

The invention relates to the technical field of carbon black materials, and discloses special carbon black with high specific surface area and a preparation method thereof, and the special carbon black is prepared by pyrolysis and activation treatment of a precursor mixture, a catalyst and a template agent. The precursor mixture contains a biomass refined product, waste polymer pyrolysis oil and a copolymer template agent, and the performance is optimized through a rotating flow field high-temperature reactor and a microwave-assisted activation process. The carbon black has a hierarchical porous structure, the specific surface area reaches 2000-2500m < 2 > / g, the conductivity is improved by 1-2 orders of magnitude, and the chemical properties can be regulated and controlled through surface functionalization. The low-cost and sustainable production is realized, the mechanical strength, the conductivity and the adsorption performance are remarkably improved, and the requirements of the high-end field are met.

The invention relates to the technical field of underground water prevention and control, in particular to a tunnel two-step grouting plugging method for wide crack water gushing, which comprises the following steps of: constructing a grouting hole intersected with a wide crack or a concentrated water gushing channel according to a geological survey result; first rapid plugging slurry is injected into the crack through the grouting hole, and the first rapid plugging slurry can form a temporary water stopping barrier in the flowing water environment; the water outlet amount change and the grouting pressure change of the adjacent observation holes are monitored, and when the water outlet amount is remarkably reduced and / or the grouting pressure stably rises and forms a platform, it is judged that the temporary water stop barrier is formed; and second reinforcing grout is injected into the crack through the grouting holes, and after the second reinforcing grout is solidified, a permanent reinforcing body with mechanical strength is formed. By optimizing the grouting material and the process time sequence, effective combination of rapid plugging and long-term reinforcement is achieved, the grouting reliability is improved, and the engineering cost is reduced.

The invention discloses a method for refining grains of a titanium alloy. According to the method, an original low-oxygen-content titanium alloy plate is subjected to cryogenic pretreatment, the temperature of the core of the original low-oxygen-content titanium alloy plate is reduced to a certain temperature, then the cryogenic low-oxygen-content titanium alloy plate is fed into a rolling mill, the single-pass reduction rate is controlled, cryogenic rolling is completed, high refinement and uniform distribution of crystal grains are achieved, and the low-oxygen-content titanium alloy plate is obtained. And the rolled titanium alloy plate is subjected to subzero treatment again, and the titanium alloy plate of the complex twin crystal structure formed by intersection of {11-22} and {10-11} twin crystals is obtained. The method has the beneficial effects that under the synergistic effect of low oxygen and deep cooling, even under the extremely small deformation amount, the cross effect of various twin crystal systems can be efficiently activated, a high-density and complex twin crystal structure is formed, high refinement and uniform distribution of crystal grains are achieved, then the mechanical strength and low-temperature toughness of the material are remarkably improved, and the service life of the material is prolonged. And the application requirements in a severe low-temperature service environment are met.

The invention discloses a high-transparency PVB intermediate film and a production process and application thereof, and relates to the technical field of PVB intermediate films, the high-transparency PVB intermediate film comprises the following raw materials by weight: 100 parts of PVB resin, 20-30 parts of a composite plasticizer, 0.5-0.9 part of an LDH-based composite antioxidant, 0.5-1 part of an ultraviolet light absorber, 0.1-1.5 parts of nano lanthanum hexaboride, 0.1-1.5 parts of porous hollow nano copper sulphide, and 0.1-2 parts of nano TiO2 / SiO2 core-shell particles. The PVB intermediate film provided by the invention is relatively high in light transmittance, low in haze value, and excellent in oxidation resistance, weather resistance and mechanical strength.

The utility model relates to the technical field of power cables, and provides a three-layer co-extrusion cable, which comprises a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a metal shielding tape, an armor layer and a sheath layer, the conductor shielding layer, the insulation layer and the insulation shielding layer are integrally formed, the conductor shielding layer, the insulation layer and the insulation shielding layer are sequentially arranged outside the conductor in a wrapping mode, the metal shielding belt is arranged outside the insulation shielding layer in a wrapping mode, the armor layer is arranged outside the metal shielding belt in a wrapping mode, and the sheath layer is arranged outside the armor layer in a wrapping mode. According to the three-layer co-extrusion cable provided by the utility model, the conductor shielding layer, the insulating layer and the insulation shielding layer are integrally formed and are sequentially and tightly coated outside the conductor, so that the overall stability and the mechanical strength of the cable are enhanced. The tight combination mode reduces the gaps between the layers, and effectively prevents the problems of conductor extension and insulation shrinkage, thereby improving the reliability and durability of the cable.