45results about How to "Prevent extension" patented technology

The utility model discloses a self-adhesive agricultural mulching film, which relates to the technical field of agricultural mulching films, and comprises a middle film, two sides of the middle film are fixedly connected with side films, the mulching film is in cohesive connection with ground soil through a cohesive layer at the bottom of a cohesive weed suppression layer, and the design of ensuring the cohesive gradient ensures that the cohesive of a central area is larger. After the sticky protrusions are combined with the soil, the laying efficiency of workers is improved, fixing through U-shaped nails is not needed, physical loss is reduced, the labor intensity of the workers is reduced, the sticky strength of the edges is small, film uncovering is facilitated, the film uncovering speed is increased, and the waste film recycling speed is increased. A plurality of groups of dividing holes are arranged in sequence to realize temperature adjustment and promote plant growth, the directional flow guide grooves adopt the design of V-shaped grooves, namely the design of inclination angles, so that the rainwater diversion efficiency is improved, drainage can be helped, and waterlogging damage to roots can be effectively prevented; and the problem that the mulching film is lifted due to overlarge wind force is effectively prevented.

The application discloses a gradient cemented carbide with solid solution change distribution and a preparation method thereof. The gradient cemented carbide comprises a poor-FCC high-toughness area, a rich-FCC high-hardness area and a core area from outside to inside. The thickness of the poor-FCC high-toughness area is denoted as L1, the thickness of the rich-FCC high-hardness area is denoted as L2, the ratio of L2 to L1 is 1.1-5:1, and the ratio of the EBSD calibration area of the rich-FCC high-hardness area to the core area is 1.1-3:1. The preparation method comprises preparing raw materials according to the elements and proportions of the gradient cemented carbide, pressing forming and alloy sintering. The gradient cemented carbide can realize the double high characteristics of the high-toughness surface layer and the high-hardness subsurface layer at the same time without changing the alloy matrix component system and the hard phase particle size system, thereby significantly improving the high-temperature plastic deformation resistance of the cutter.

The utility model discloses a root-resistant waterproof basement roof landscape planting roof structure which comprises a structural layer, a supporting frame is placed at the upper end of a filtering layer, the interior and the exterior of the supporting frame are filled with vegetation soil layers, the inner wall of the supporting frame is fixedly connected with a threaded installation groove, and a planting bin is installed on the inner wall of the threaded installation groove in an inserted mode. According to the root-puncture-resistant waterproof basement roof landscape planting roof structure, the planting pool can be reinforced and mounted through the reinforcing blocks and the cement mounting layer, the planting pool is an integrally-formed steel mechanism and is good in stability, the vegetation soil layer can be supported through the supporting frame, soil is prevented from being too compact, growth is not affected, and the service life of the planting pool is prolonged. Cultivation can be facilitated through the planting bin, root extension can be effectively prevented through the planting bin and the supporting frame, the planting bin can be rapidly and independently disassembled and assembled through the threaded mounting groove, the root puncture resistant waterproof roll is conveniently and stably adhered through the adhesion fixing block, replacement and use are convenient, and the use effect is good.

The present application relates to the technical field of road engineering, and particularly relates to a bridge-head cover plate combined fiber anti-cracking flexible splicing structure and a preparation method thereof, which comprises a base layer with an asphalt pavement part on the top and an abutment; the base layer, the abutment and the asphalt pavement part form a groove, the side wall of the groove is formed by the asphalt pavement part, the bottom wall of the groove is formed by the base layer and the abutment; the inner wall of the groove is coated with a two-component high-viscosity high-elasticity interface adhesive; from bottom to top, the groove is sequentially filled with a high polymer elastic body and a reinforced anti-cracking asphalt mixture; a basalt fiber bar anchoring member is pre-buried in the inner wall of the groove, and the high polymer elastic body and the reinforced anti-cracking asphalt mixture wrap the basalt fiber bar anchoring member; through the stress diffusion of the interface adhesive layer, the deformation buffer of the flexible bottom layer and the anti-cracking cooperation of the rigid surface layer, the road surface longitudinal slope mutation caused by the differential settlement of the abutment and the base layer is effectively relieved, the vehicle jumping impact force is reduced, the road surface longitudinal corner is reduced, and the driving smoothness and the structural durability are significantly improved.

A water-reducing agent for coal-based solid waste concrete and its preparation method are disclosed. The water-reducing agent comprises 40-60 parts of a polycarboxylate-based main agent, 15-25 parts of a slump retainer, 10-20 parts of a crack-resistant reinforcing agent, 5-10 parts of a dispersing agent, 2-5 parts of a stabilizer, and 10-20 parts of deionized water. The slump retainer is a modified polyetheramine prepared by block copolymerization of ethylenediamine with ethylene oxide and propylene oxide; the crack-resistant reinforcing agent is a composite of nano-calcium carbonate and modified lignin sulfonate. This invention reduces the adsorption loss of the water-reducing agent by coal-based solid waste particles through the synergistic effect of the polycarboxylate-based main agent and the modified polyetheramine slump retainer, achieving a slump loss rate of ≤15% after 2 hours. The nano-calcium carbonate fills interfacial voids, and the modified lignin sulfonate alleviates hydration thermal stress, resulting in a lower 28-day drying shrinkage rate and higher crack resistance of the concrete. This invention solves the problems of poor adaptability, short slump retention time, and insufficient crack resistance of traditional water-reducing agents in high-volume coal-based solid waste concrete.

A compact-structure pin assembly with a plugging position retracted comprises a support arranged in a conversion socket and a pin unit connected to the support in a sliding mode, the pin unit comprises at least a first pin assembly, a second pin assembly and a third pin assembly which are arranged side by side, and the support comprises a bottom plate. The support is further provided with two pieces of conductive hardware corresponding to the L pole and the N pole respectively. Each of the first pin assembly, the second pin assembly and the third pin assembly comprises a sliding part, a pin and a plug connector, and the conductive hardware is further provided with a plug-in position in mutual plug-in connection with the plug connector; and the plugging positions are positioned in the orthographic projection range of the two sliding parts at the two ends of the pin unit towards the bottom plate. According to the technical scheme, the overall size of the conversion socket can be effectively reduced, and the conversion socket can be miniaturized and portable.

The present application relates to the technical field of silicone rubber material, in particular to a sericite modified silicone rubber material and a preparation method thereof.The present application overcomes the problems of poor dispersion of sericite in the organic silicon matrix and poor compatibility of fluorosilicon and common silicon.The silicone rubber material is prepared from polysiloxane hybrid base glue prepared by in-situ polymerization of fluorine-containing / ethenyl double modified sericite, fluorosilicon raw rubber, methylphenylvinyl silicone rubber, MQ silicone resin, hydrogen-containing silicone oil and vulcanizing agent;the preparation process involves double functional group grafting on the surface of sericite, monomer in-situ ring-opening polymerization coating, multiphase blending to build interpenetrating network and hydrogen-containing silicone oil chain extension to cooperate with gradient vulcanization, through building a rigid-flexible stereo enhanced network, the material is endowed with excellent oil resistance, heat resistance and high mechanical strength, and can be used in the field of automobile manufacturing.

The invention relates to a pole-mounted single-phase transformer, and relates to the technical field of intelligent power grids, the pole-mounted single-phase transformer comprises a cylindrical main body, and the cylindrical main body is provided with a low-voltage bushing and a high-voltage bushing; a plurality of supporting frames are fixedly arranged on the peripheral face, away from the low-voltage sleeve, of the cylindrical body, connecting plates are rotationally installed on the outer edges of the top face and the bottom face of the cylindrical body, and protection plates are vertically and fixedly arranged on the side face edges, away from the cylindrical body, of the connecting plates. The two connecting plates can rotate back to back to a mounting state parallel to the axis of the cylindrical main body and are fixed when equipment is mounted and applied, and the protective plates rotate to a protective state parallel to the end surface of the cylindrical main body at the same time; a scraping plate is rotationally mounted on the side face, away from the protective plate, of the connecting plate, and a driving part for driving the scraping plate to rotate is fixedly arranged on the side face, facing the protective plate, of the connecting plate; the driving piece drives the scraper to rotate, the scraper can specifically clean plants attached to the outer side face of the connecting plate, and the plants are prevented from further extending to cover the equipment.

The invention discloses a preparation method of a wear-resistant and stretch-resistant biaxial fiber fabric, belongs to the technical field of fiber fabric processing, and is used for solving the technical problem that the wear resistance and stretch resistance of the biaxial fiber fabric in the prior art need to be further improved. Then weaving, coating the surface, and finally curing and drying to obtain the wear-resistant stretch-resistant biaxial fiber fabric. The modified fiber disclosed by the invention is subjected to surface epoxy grafting modification, so that the wear resistance of the modified fiber is kept, the compatibility with other components is improved, and a wear-resistant basic framework is provided for a fabric; the modified coating agent forms a cross-linked network with the curing agent through the polyester polyol, a high-hardness wear-resistant coating is formed on the surface of the fabric in combination with the reinforcing effect of the modified filler, and the wear-resistant and tensile properties of the fabric are jointly improved through chemical compatibility and structural synergy of the polyester polyol and the curing agent.

The application discloses a kind of high fire endurance closed-cell foam ceramic material and its preparation method, and the weight percentage of the ceramic material raw material formula is as follows: white ceramic tailings 20-40%, tea crystal stone 15-30%, burned soil 5-15%, high-alumina sand 5-10%, desert sand 15-25%, light-burned magnesium 5-15%, plus foaming agent 0.1-3%.According to the weight percentage of the ceramic material raw material formula, normal foam ceramic A material, high-density foam ceramic B material or low-density foam ceramic C material is configured respectively, and the closed-cell foam ceramic material is obtained by ball milling, spray granulation, mixing and loading box sintering.The technical scheme of the application not only has simple process, low cost and superior performance, but also improves the fire endurance of the material, meets the use requirements of wall materials, widens the application field of closed-cell foam ceramic, and has broad market prospect.

The invention provides a silicon-carbon composite material as well as an appearance evaluation standard and application thereof, and relates to the technical field of battery negative electrode materials. The silicon-carbon composite material comprises sphere-like silicon-carbon particles, and each sphere-like silicon-carbon particle comprises a silicon-carbon plane and a silicon-carbon transition cambered surface adjacent to the silicon-carbon plane; and the minimum value of the curvature of the cambered surface infinitesimal element of the silicon-carbon transition cambered surface at the joint of the silicon-carbon transition cambered surface and the silicon-carbon plane is 0. The material is of a sphere-like structure containing a plane and an adjacent transition cambered surface, the structure and a base body can form three-dimensional interlocking, mechanical binding force is enhanced, interface crack propagation is restrained, particles can be promoted to be directionally arranged to form regular and uniform slit-shaped channels / pores, the compression resistance and abrasion resistance of the material are improved, the stacking density is increased, and the contact area is increased. And the silicon-carbon composite material has excellent electrochemical performance. The shape evaluation standard represented by the polyhedron degree Q (0-1, the closer to 1, the closer to an ideal polyhedron) is provided, the problem that the shape of an existing polyhedral material lacks a unified evaluation standard is solved, a scheme is provided for similar polyhedral material evaluation, and material design, screening and application are promoted.

This invention discloses a method for preparing abrasive wheel mesh that can improve the strength of a coating. S1: Fabrication of fiberglass cloth; S2: Fabrication of adhesive, using the following materials: 60-100 parts of thermoplastic phenolic resin solid, 6-10 parts of curing agent, 5-8 parts of defoamer, 5-8 parts of reinforcing filler, 30-50 parts of thermosetting phenolic resin liquid, 0.5-2 parts of coupling agent, and 80-140 parts of alcohol; S3: Coating; S4: Coating. This invention adds a curing agent and a reinforcing filler to the adhesive. The addition of both reduces the coefficient of thermal expansion and curing shrinkage of the cured material, thus reducing internal stress. When cracks appear under overload, the filler-containing adhesive layer can prevent crack propagation, thereby improving the bonding strength. Simultaneously, by strictly controlling the coating amount and the relative humidity of the coating during the coating process, the bonding strength and coating strength are further improved.

This invention discloses a barium sulfate@aluminum borate-MXene composite powder and its preparation method, belonging to the technical field of high-performance inorganic composite functional materials. The composite powder possesses a unique core-shell-lamellar structure: barium sulfate nanospheres form the core, coated with a uniform aluminum borate layer to form the core-shell nanospheres. These barium sulfate@aluminum borate core-shell nanospheres are further loaded onto the surface of two-dimensional MXene nanosheets. The preparation method includes: synthesizing barium sulfate nanospheres via precipitation; in-situ coating of aluminum borate onto their surface using a hydrothermal method to form a barium sulfate@aluminum borate core-shell structure; preparing MXene nanosheets via liquid-phase exfoliation; and finally mixing and assembling the two to obtain the final product. The core advantage of this invention lies in achieving a triple synergy of high-temperature flame retardancy of aluminum borate, rigid support of barium sulfate, and interface enhancement and barrier effect of MXene through the above-mentioned multi-level structural design.

This utility model relates to the field of pipe jacking construction technology, specifically a support structure for a large-diameter sewage pipe at the bottom of a pipe jacking system. It includes a launching well and a receiving well positioned opposite each other on either side of the sewage pipe. A pipe jacking channel spanning the sewage pipe is provided between the launching well and the receiving well. Several guide pipes penetrating the well wall are pre-embedded in either the launching well or the receiving well. Interlocking piles are arranged parallel to each other on both sides of the sewage pipe. Pipe roofs are fixed inside the guide pipes and connected to the interlocking piles. This support structure forms a pipe jacking channel system spanning the sewage pipe through the coordinated arrangement of the launching well and the receiving well. The pre-embedded guide pipes on the side of the well closer to the sewage pipe enable precise positioning and installation of the pipe roofs. Combined with the interlocking piles, a three-dimensional support system is formed, effectively dispersing the concentrated stress of the jacking load on the sewage pipe below.

The application discloses a preparation method and application of low-carbon magnesite-carbon brick, relates to the technical field of low-carbon magnesite-carbon brick preparation, and comprises the following component materials: 69-73 parts of fused magnesite, 3-7 parts of zirconia, 3.5-7.5 parts of graphite powder, 2.8-3.4 parts of phenolic resin, 2.5-4 parts of a functional additive and 1-2 parts of nanometer materials; the nanometer materials can be added to enhance the strength and toughness of the matrix, can also fill the pores of the fused magnesite and the zirconia, realize the close packing of particles, and reduce the apparent porosity of the material; the zirconia can be added to provide a solid, stable and non-shrinking skeleton support for the brick body, and guarantee the high-temperature stability; the functional additive can be added to optimize the phase composition under high temperature, enhance the thermal shock resistance and wear resistance of the brick body, and ensure that the low-carbon magnesite-carbon brick can still maintain good structural integrity and use reliability under high temperature and complex working conditions.

The utility model provides a copper foil surface roughening treatment device, which relates to the technical field of copper foil production and processing, and comprises a base, the top of the base is provided with a recovery tank, and the bottom of the base is fixedly connected with a recovery box; according to the copper foil surface roughening treatment device, the distance between the flow stopping rings adapts to the size of a copper foil, a passivation solution in the liquid storage tank flows to the surface of the passivation roller, the flow stopping rings can prevent the passivation solution from extending to other positions of the passivation roller, the driving motor is started to drive the conveying roller to rotate, the copper foil is conveyed, and the copper foil surface roughening treatment efficiency is improved. The passivation roller is driven to rotate in the copper foil conveying process, passivation liquid is smeared to the surface of the copper foil through the passivation roller, after machining is completed, the two-way screw is rotated to drive the arc-shaped baffle to shield the liquid storage box, the passivation liquid is prevented from flowing out continuously, the area of the passivation liquid on the surface of the passivation roller can be adjusted according to the size of the copper foil, and therefore waste of the passivation liquid is prevented. And the processing cost is reduced.

The invention discloses an organic-inorganic hybrid composite dust suppressant with rolling compaction resistance and a preparation method thereof. The organic-inorganic hybrid composite dust suppressant comprises the following raw material components in percentage by weight: (A) 10-20% of an organic-inorganic hybrid polymer; (B) 1%-3% of an inorganic nano material; (C) 1%-3% of a humectant; (D) 0.15%-0.45% of a wetting penetrant; (E) 0.75%-3% of a stable dispersion system; and (F) water: the balance being water, wherein the total percentage is 100%. Comprising the following steps: preparing a water-phase base solution, preparing an oil-phase pre-emulsion, carrying out in-situ hybridization polymerization, and carrying out functional compounding. A cured layer formed after the prepared composite dust suppressant is applied to mine road dust control can lock moisture for a long time and prevent a cured shell layer from shrinking and embrittling due to excessive drying, the composite dust suppressant has enough mechanical strength and excellent toughness, and organic-inorganic components of the composite dust suppressant must have a strong interface chemical binding force, so that the composite dust suppressant has a very good application prospect. And rolling impact and shearing of heavy-load vehicles can be effectively resisted.

The invention relates to an oil-cooled motor iron core structure, an oil-cooled motor and a rotary vane welding combination determining method. The oil-cooled motor iron core structure comprises a first assembly, a second assembly and a third assembly. The component I is laminated by a first punching sheet and a rotary sheet, a boss group is arranged on the outer circle side of the component I, and the boss group comprises a first type of boss with a welding groove and a second type of boss without a welding groove; in the first assembly, a first welding bead communicated with the cooling oil channel is formed through the interval between the boss sets, and an end butt welding bead isolated from the cooling oil channel is formed through welding grooves in the first type of bosses at the two axial ends of the first assembly. The assembly II and the assembly III are laminated by a second punching sheet and a rotary sheet, and an oil injection port and another welding groove are respectively formed in the assembly II and the assembly III; the other welding groove of the second assembly is aligned and communicated with the butt welding bead at the head end of the first assembly to form a second welding bead; the other welding groove of the third assembly is aligned and communicated with the butt welding bead at the end part of the tail end of the first assembly to form a third welding bead; the radial inner sides of the second welding bead and the third welding bead are blocked by the second type of bosses so that the second welding bead and the third welding bead can be isolated from the cooling oil channel.

This invention belongs to the technical field of graphene and functional rubber composites, specifically a simplified preparation process for high tear strength graphene-modified natural rubber based on an interpenetrating double crosslinked network structure constructed with two vulcanizing agents. This invention uses two vulcanizing agents: sulfur and peroxide. Sulfur rapidly forms a high-density carbon-sulfur crosslinked network (-C-Sx-C-) in the natural rubber composite, constituting the mechanical load-bearing skeleton between the natural rubber main chains, imparting high tear strength and fatigue resistance. Peroxide has a relatively slow vulcanization rate, and it slowly decomposes at lower temperatures to generate free radicals, constructing a stable -C-C- secondary crosslinked network between the terminal segments of the carbon-sulfur main network outside the sulfur vulcanization skeleton network. This improves the three-dimensional structural integrity of the vulcanization network, reduces the loss modulus of the rubber, and thus reduces heat generation during dynamic compression. This invention effectively improves the tear strength of natural rubber vulcanizates through the synergistic effect of nanofiller reinforcement and the interpenetrating double crosslinked network structure.

The application relates to the technical field of building materials, and discloses a mortar containing nanomaterials and a preparation method thereof, the mortar being composed of 70-80 parts by weight of cement, 8-12 parts by weight of fly ash, 0.4-0.5 parts by weight of a polycarboxylate water reducing agent, 0.4-0.6 parts by weight of hydroxypropyl methylcellulose, 1-2 parts by weight of nanomaterials, 2-3 parts by weight of modified silk fibroin and 40-50 parts by weight of water. The modified nanosilica is modified by gamma-aminopropyl triethoxysilane, the modified cubic nanometer calcium carbonate is modified by fumaric acid, sodium stearate and palmitic acid, and the modified silk fibroin is prepared by being grafted and modified by a double-aminopropyl-terminated polysiloxane. The mortar is treated by optimizing component collocation, modifying the nanomaterials and the silk fibroin, the mechanical properties, the durability and the crack resistance of the mortar are remarkably improved, and the cost is controllable.

This invention relates to the field of composite coating technology, and more particularly to a graphene-enhanced plasma electrolytic oxidation composite coating, its preparation method, and its application. The preparation method of the graphene-enhanced plasma electrolytic oxidation composite coating provided by this invention includes the following steps: mixing a graphene dispersion and a basic electrolyte to obtain a graphene-enhanced PEO composite electrolyte; using AlSi... 10 Using a Mg alloy substrate as the anode and a stainless steel electrolytic cell as the cathode, plasma electrolytic oxidation treatment is performed in the graphene-reinforced PEO composite electrolyte to obtain a graphene-reinforced plasma electrolytic oxidation composite coating. The graphene-reinforced plasma electrolytic oxidation composite coating prepared by this method exhibits excellent comprehensive properties, including mechanical properties, abrasion resistance, and corrosion resistance.

This invention discloses a UV-curable raw lacquer hybrid prepolymer coating and its preparation method, comprising: rosin acid, hydroxyethyl acrylate, p-toluenesulfonic acid, polymerization inhibitor, 4-acryloyloxybenzophenone, polyethylene glycol methyl ether acrylate, azobisisobutyronitrile, refined raw lacquer, trimethylolpropane triacrylate, leveling agent, and defoamer. The coating uses rosin acid as a rigid framework, forming a macromolecular photoinitiator by side-linking benzophenone photoinitiator groups and flexible polyether segments. Then, through a controllable UV pre-irradiation process, it undergoes free radical grafting with lacquer urushiol to construct a "rigid-tough tunable" hybrid network. This invention solves the problems of slow curing of raw lacquer, easy migration of small-molecule photoinitiators, and high coating brittleness in existing technologies. The coating uses a macromolecular photoinitiator design, with the initiating groups fixed to the rosin framework through chemical bonds, fundamentally solving the migration problem. Furthermore, the "pre-grafting" process improves compatibility, endowing the coating with excellent comprehensive properties.

The application discloses a welding fume purification and collection device based on high negative pressure and relates to the technical field of welding equipment. The device comprises a main body structure, a welding machine body, a shell fixedly connected to one side of the welding machine body, a negative pressure pipe communicated with the top of the shell, a dust hopper communicated with the bottom of the shell, a collecting pipe communicated with one side of the dust hopper, a mounting plate arranged in the inner cavity of the shell, a mounting hole formed in the top of the mounting plate, a hoop ring clamped in the inner cavity of the mounting hole and a filter bag fixedly connected to the inner cavity of the hoop ring. When the performance of the filter bag is affected by dust accumulation, the device automatically starts the cleaning process without manual intervention, thereby greatly saving the maintenance time and labor cost, ensuring the continuity of the welding operation, avoiding the extension of the construction period caused by maintenance and reducing the production cost of enterprises.

The invention belongs to the technical field of aerogel materials in colloidal chemistry, and particularly relates to an aerogel-based composite heat dissipation coating and a preparation method thereof. The preparation method comprises the following steps: S1, preparing silica sol by using sodium metasilicate and hydrochloric acid as raw materials, preparing aluminum oxide sol by using aluminum chloride hexahydrate, deionized water and absolute ethyl alcohol as raw materials, then mixing the silica sol, the aluminum oxide sol, a carbon nanocage and epoxypropane, and then performing supercritical drying treatment to obtain a carbon nanocage catalyst; a composite aerogel base material is obtained; and S2, preparing silver-containing graphene from graphene nanosheets and silver nitrate as raw materials, compounding the silver-containing graphene with carbon nanotubes to obtain a high-thermal-conductivity filler, mixing the high-thermal-conductivity filler with a binder to obtain coating slurry, coating the surface of a composite aerogel base material with the coating slurry, and carrying out heat treatment and vacuum drying to obtain the aerogel-based composite heat dissipation coating. According to the invention, light weight and high heat conductivity are realized, and the mechanical properties of the material are effectively improved.

The invention discloses a high-performance polyphenyl ether material and a preparation method thereof.The preparation method comprises the steps that modified polyphenyl ether reacts with a modified additive, bromine atom sites on the modified polyphenyl ether react with phenolic hydroxyl groups on the modified additive, then the product is mixed with modified carbon nanotubes, a cross-linking agent and benzophenone, a mixture is prepared, the mixture is subjected to vacuum drying, and the high-performance polyphenyl ether material is obtained. The preparation method comprises the following steps: modifying carbon nanotubes and modified polyphenyl ether, reacting under the condition of ultraviolet irradiation to prepare the high-performance polyphenyl ether material, reacting double bonds on the modified carbon nanotubes and double bonds on the modified polyphenyl ether with sulfydryl on a cross-linking agent during ultraviolet irradiation to further form dynamic cross-linking, dissipating energy through dynamic bond exchange, actively relaxing stress and passivating cracks, and preparing the high-performance polyphenyl ether material. The modified polyphenyl ether reacts with the modified additive to form a cross-linked network, and the modified additive is an organic silicon elastomer and can serve as a stress concentration point to induce a matrix to generate a large amount of crazing and shear bands, so that a large amount of energy is absorbed, and cracks are prevented from further expanding.

The invention relates to a flame-retardant smoke-suppression anticorrosive fiber material, a coating, a preparation method of the flame-retardant smoke-suppression anticorrosive fiber material and the coating containing the fiber material, and belongs to the technical field of functional coating materials. The preparation method of the fiber material comprises the following steps: (1) mixing and stirring a flame retardant, an organic solvent and a surfactant to obtain a core layer solution; (2) dispersing polyvinylidene fluoride-trifluoroethylene and inorganic nanoparticles in an organic solvent, and stirring to obtain a shell solution; and (3) simultaneously spinning the core layer solution and the shell layer solution to obtain the fiber material. After the coating of the fiber material is cured on the surface of a base material, a formed coating is a continuous fiber reinforced composite material and has flame-retardant, smoke-suppression, self-repairing and anti-corrosion properties at the same time. The inorganic nanoparticles are introduced into the shell layer and the thermal response type flame retardant is encapsulated in the core layer, so that the chemical activity or toxicity of harmful chemical substances is reduced through chemical adsorption, coordination binding and / or catalytic conversion under a fire or corrosion induction condition, and the flame-retardant smoke suppression, self-repairing and corrosion-resistant properties are synergistically realized.

This invention discloses a polylactic acid (PLA) fiber, its preparation method, and its applications, belonging to the field of polymer materials technology. Through a three-step continuous chemical modification process involving ring-opening polymerization, silanization, amylation, and Schiff base grafting onto stereocomposite PLA, with modified MXene as the core functional modifier, the fiber is endowed with multiple functions including nano-reinforcement, interfacial compatibility, dynamic self-healing, and stereocomposite heat resistance. The prepared PLA fiber exhibits a tensile strength of 80-95 MPa, an elongation at break of 800-1000%, a melting point of 180-190℃, a strength retention rate of >92% after 180 days at 40℃ / 50% RH, and a scratch self-healing rate of >80% after 1 hour of heating at 80℃, while maintaining complete biodegradability. The process of this invention uses traditional melt spinning equipment, is suitable for large-scale production, and can be applied to high-end textiles, medical, filtration, and packaging fields.

This invention relates to the technical field of silt reinforcement, and discloses a method for preparing a fiber-reinforced composite curing agent for silt reinforcement, comprising the following preparation steps: 1) drying carbide slag and desulfurized gypsum separately; 2) grinding and mixing the dried carbide slag and desulfurized gypsum to form a grinding material; 3) mixing the grinding material with slag, fly ash and glass fiber to form a fiber-reinforced composite curing agent; after being incorporated into the silt, the glass fiber randomly interweaves in the solidified soil to form a three-dimensional network, and the excellent tensile and pull-out properties of the glass fiber itself hinder or delay the deformation and failure of the soil; when the soil is deformed by external force, the glass fiber prevents the development and extension of cracks by exerting interfacial friction, enhances the soil's resistance to deformation, and thus changes the failure mode, solving the problem of brittle failure of silt-reinforced soil.

The invention belongs to the technical field of cementing materials, and particularly relates to an organic-inorganic composite alkali-activated cementing material and a preparation method thereof. The modified wollastonite added into the organic-inorganic composite alkali-activated cementing material has a large amount of silicon hydroxyl (Si-OH), and the groups are high in activity, so that the compatibility and binding force of the wollastonite and the styrene butadiene rubber emulsion can be greatly improved. The modified wollastonite provides CaO and SiO2 at the same time, a hybridization system composed of N-A-S-H gel, C-A-S-H gel and unreacted wollastonite needle-shaped particles is formed, the hybridization system can force cracks to deflect, bypass and branch in the expansion process, more fracture energy is consumed, and therefore the fracture toughness and toughness of the material are improved.