36results about How to "Improve interfacial adhesion" patented technology

This invention provides an antistatic and privacy-protecting polarizing film and its preparation process, belonging to the field of polarizing film preparation technology. The preparation process includes the following steps: preparation of an antistatic agent; preparation of a modified adhesive; preparation of a composite polarizing film; and preparation of the polarizing film. This invention introduces an antistatic agent and POSS-modified graphene oxide into the modified adhesive, making the adhesive layer a conductive medium connecting multiple layers such as the polarizing film (PVA), TAC layer, and privacy film, forming a cross-layer conductive path. This avoids static electricity accumulation at the interface, improving the antistatic effect. Boric acid is first used to crosslink the PVA film, followed by glyoxal crosslinking, achieving long-term reliability of the polarizing film under high temperature and high humidity environments.

The invention discloses a PLA (polylactic acid) laminated composite material as well as a preparation method and application thereof, and belongs to the technical field of laminated paper. 20 to 30 parts of a bio-based toughening component; 15 to 25 parts of cationized filler; 2-4 parts of a heat-resistant compatilizer; 1 part of a nucleating agent TMC-300; the heat-resistant compatibilizer is a terpolymer formed by norbornene imide, 1, 6-hexanediol diacrylate and glycidyl methacrylate, according to the PLA lamination composite material provided by the invention, through the synergistic effect of the heat-resistant compatibilizer and the cationization filler, an organic-inorganic dual-reinforcement system is constructed, the material body performance is enhanced, the heat-resistant compatibilizer and the cationization filler are combined, and the heat-resistant compatibilizer and the cationization filler are combined, so that the heat-resistant compatibilizer and the cationization filler are combined, and the heat-resistant compatibilizer and the cationization filler are combined. And the interface bonding strength of the lamination layer and the paper is improved, and finally, the full-biodegradable lamination material with high heat resistance, excellent flexibility and firm interlayer bonding force is prepared and is suitable for preparing heat-resistant lamination paper products.

The invention provides a modified epoxy resin water permeable brick and a preparation method thereof. The modified epoxy resin water permeable brick is prepared from the following raw materials in parts by weight: 95 to 105 parts of aggregate, 8 to 15 parts of modified epoxy resin, 1 to 3 parts of curing agent, 5 to 8 parts of composite filler, 0.1 to 0.3 part of exciting agent, 2 to 4 parts of self-repairing component and 1 to 3 parts of diluent. According to the water permeable brick, through the synergistic effect of the organic silicon modified epoxy resin and the special curing agent, the anti-aging performance of the material is improved. The introduced Si-O-Si bond can effectively resist the attack of ultraviolet photons; long-chain alkyl in the curing agent forms a compact physical barrier layer, so that oxygen and moisture permeation is greatly slowed down, the water permeable brick can effectively resist pulverization, yellowing and embrittlement in long-term outdoor use, the compressive strength and the water permeability coefficient of the water permeable brick can still keep an extremely high retention rate after long-term use, the service life is remarkably prolonged, and the water permeable brick is suitable for popularization and application. The industrial pain point that a traditional resin-based water permeable brick is easy to age is solved.

The invention provides a carbon fiber reinforced polyether-ether-ketone self-lubricating composite material and a preparation method and application thereof.The preparation method comprises the steps that carbon fiber serves as an anode, voltage is applied to an electrolyte solution, electrochemical oxidation treatment is conducted, hydroxylated carbon fiber is obtained, the hydroxylated carbon fiber and 2-amino-5-nitrobenzothiazole are mixed, and the carbon fiber reinforced polyether-ether-ketone self-lubricating composite material is obtained. Adding an anhydrous modified reaction solvent, and reacting at 25-40 DEG C for 4-10 hours to obtain modified carbon fibers; and melting and granulating the self-lubricating composite material: mixing the modified carbon fiber, polyether-ether-ketone, a lubricant and an auxiliary agent in a high-speed mixer for 10-20 minutes, extruding by using a double-screw extruder, cooling, and granulating to obtain the carbon fiber reinforced polyether-ether-ketone self-lubricating composite material. The carbon fiber reinforced polyether-ether-ketone self-lubricating composite material is applied to self-lubricating mechanical parts. According to the self-lubricating composite material, the self-lubricating performance is improved, the interface bonding energy between the carbon fibers and the polyether-ether-ketone is enhanced, and the self-lubricating composite material has good mechanical performance.

The present application relates to the technical field of road engineering pavement materials, in particular to a composite asphalt regenerant, a preparation method, a use method and an application thereof.The regenerant comprises, by mass percentage, 30-70% of aromatic component oil, 15-50% of hydrogenated base oil, 5-10% of a curing accelerator, 3-10% of a low-temperature stabilizer, 0.5-3.0% of an antioxidant, 0.5-5.0% of a diluent and 1-5% of an ammonium ion stabilizer.The present application significantly reduces the viscosity of the regenerant through multi-component synergy, realizes normal-temperature construction in all seasons, effectively restores the penetration and softening point of aged asphalt, delays secondary aging through the synergy of the antioxidant and the ammonium ion stabilizer, and simultaneously enhances the low-temperature crack resistance and initial strength of the recycled mixture, and is suitable for plant-mixed hot recycling, in-place hot recycling and cold recycling processes.

The present application relates to the technical field of aerated concrete preparation, and particularly relates to a method for preparing electrically conductive aerated concrete by using porous carbonized recycled aggregate and the aerated concrete. The process method first places pre-wetted recycled aggregate in a pressurized carbonization kettle, and industrial waste gas with CO2 concentration greater than or equal to 20% is introduced to react for 2-3 hours at 0.5-0.7 MPa and 60-70 DEG C to produce porous carbonized recycled aggregate. Then the porous carbonized recycled aggregate is dry-mixed with gel material, gypsum, conductive carbon black and reinforcing fibers, and then mixing water containing water reducing agent (water aggregate ratio 55-60%) is added to stir into base mortar. Then aluminum paste suspension is added to the mortar, and after stirring to start aeration, the mortar is poured into a mold. After 2-3 hours of static aeration, the mold is finally autoclaved and dried for 6-8 hours to obtain the electrically conductive aerated concrete. Through aggregate pretreatment strengthening, orderly dispersion of the conductive phase and hierarchical curing control, the present application can effectively solve the contradiction between light weight, high strength, electrical conductivity and durability, and provide a multifunctional green building material solution for airport construction.

The invention belongs to the technical field of road and bridge paving materials, and discloses an anti-rutting epoxy asphalt toughening additive. The formula comprises the following components in parts by weight: 40 parts of solid epoxy resin, 35 parts of a latent polyester curing agent, 5 parts of an ultra-high molecular weight epoxy toughening agent, 20 parts of a water damage resistant improver, 100 parts of hard asphalt particles, 2 parts of an antioxidant, 5.5 parts of a silane coupling agent, 6 parts of nano silicon dioxide, 0.1 part of a curing accelerator, 0.5 part of a light stabilizer and 1 part of a lubricating separant. In the formula, solid epoxy reacts with a latent polyester curing agent to form a three-dimensional rigid structure, and the three-dimensional rigid structure is matched with oxidized asphalt particles and nano silicon dioxide, so that the high-temperature stability and the pressure resistance are remarkably improved, and ruts are inhibited from the source; the ultra-high molecular weight epoxy flexibilizer can prolong the molecular chain segment of a cross-linking point, and is combined with the curing accelerator to regulate and control the reaction rate, so that the low-temperature crack resistance and fatigue resistance are enhanced while the strength is ensured.

This invention relates to the field of reinforcement materials technology, specifically to reactive low-temperature reinforcement materials for mining, their preparation methods, and applications. The reactive low-temperature reinforcement material for mining comprises component A and component B. Component A consists of polyester polyol, polyether polyol, silane coupling agent, and catalyst; component B consists of prepolymer and additives. The prepolymer is obtained by reacting polyether polyol b with polymethylene polyphenyl polyisocyanate. Polyether polyol b has a functionality of 3.1 and a hydroxyl value of 207 mg KOH / g, and is a polyether polyol polymerized with propylene oxide using maltitol, trimethylolpropane, hydroquinone, and triethylene glycol as initiators. The material prepared by this invention is primarily reactive in structure and flame-retardant, avoiding the impact of adding large amounts of additive flame retardants on material strength. The resulting material exhibits high compressive strength, low internal heat of reaction, and good flame-retardant properties.

The present application relates to the technical field of fiber reinforced geopolymer, and particularly discloses a fiber reinforced geopolymer and a drainage pipeline prepared from the same. The fiber reinforced geopolymer comprises mineral powder, fly ash, quartz sand, alkali activator, fiber, latex powder and rubber powder. The mineral powder and the fly ash are sequentially added, stirred at low speed, and mixed uniformly. While stirring, the fiber is slowly added and dry-stirred, then the quartz sand and the rubber powder are added, and water is added to stir uniformly. The latex powder is dissolved in water after being added, forms a coating layer to wrap the surface of the fiber or the geopolymer raw material, changes the interface characteristics of the fiber and the geopolymer matrix, slows down the occurrence of the polymerization reaction, makes the mechanical properties of the EGC material decrease, improves the interface bonding between the fiber and the geopolymer matrix, forms a structure of the synergistic effect of the fiber-latex powder-geopolymer matrix, increases the fracture energy of the fiber reinforced geopolymer, and improves the bending toughness of the fiber reinforced geopolymer.

The application provides a high-performance insulation blanket, which comprises a surface layer, an EVA adhesive layer and a surface layer arranged in sequence, and the surface layer and the EVA adhesive layer are calendered and bonded; the preparation raw materials of the surface layer comprise, in parts by weight, 45-55 parts of ethylene-vinyl acetate copolymer, 10-20 parts of natural rubber, 8-18 parts of PA6 short fiber, 7-10 parts of dopamine modified mica powder, 6-10 parts of MAH-g-EVA, 10-15 parts of flame retardant, 0.2-0.4 parts of antioxidant, 0.8-1.2 parts of lubricant and 2-4 parts of colorant. In the surface layer formula system, the natural rubber, the PA6 short fiber and the dopamine modified mica powder synergistically act, so that the tear resistance and the puncture resistance of the material are greatly improved, and meanwhile, the material has excellent comprehensive performances such as high-temperature resistance, insulation, flame retardation and aging resistance, and is suitable for high-demand insulation protection fields.

The application relates to the technical field of solid waste treatment and building materials, and discloses a modified sludge solidifying agent and a preparation method thereof, the solidifying agent contains modified aggregates 15-28 parts, a composite cementing agent 55-70 parts, an efficient water absorption modifier 6-12 parts, an organic polymer modifier 2-5 parts and early strength additives 1-3 parts in terms of weight fractions, and the components are mixed through proportioning and a segmented preparation process. The modified aggregates construct a framework support, the composite cementing agent provides hydration cementing action, the efficient water absorption modifier realizes rapid dehydration and heavy metal adsorption, the organic polymer modifier optimizes interface combination, and the early strength additives improve early strength. The application takes industrial solid waste as a main raw material, has high solid waste utilization rate, is low-carbon and environment-friendly, can quickly reduce the water content of sludge, significantly improves the mechanical properties and durability of a solidified body, effectively stabilizes heavy metals, and has a wide application prospect.

The invention belongs to the technical field of light building materials, and particularly relates to a preparation method of normal-temperature mixed asphalt concrete. The preparation method of the normal-temperature mixed asphalt concrete comprises the following steps: uniformly mixing 90-100 parts by weight of aggregate, 10-20 parts by weight of limestone mineral powder and 6-12 parts by weight of a fiber material at room temperature, then adding 2-4 parts by weight of a polycarboxylic acid water reducer and 1-5 parts by weight of water, stirring for 20-30 minutes, then adding 20-30 parts by weight of carboxylated cationic emulsified asphalt, and stirring at normal temperature to obtain a mixture; and pouring the mixture to obtain the normal-temperature mixed asphalt concrete. According to the invention, the dynamic stability is effectively improved while good splitting strength is ensured, and the method can be applied to light building materials.

The interface treating agent is prepared from the following components in parts by mass: 500 to 700 parts of cationic acrylic emulsion, 100 to 200 parts of cationic silica sol, 100 to 200 parts of water and 12 to 25 parts of a first auxiliary agent. The interface treating agent is suitable for a ceramic tile and other base materials with negative electricity on the surface in a normal state, the cationic acrylic emulsion is adopted as a film forming substance and has high adhesive force on the surfaces of the base materials, the permeability is improved by matching with the cationic silica sol, and the base materials with gaps and cracks on the surfaces can be filled and reinforced. On the basis, the invention further provides a coating system and a transparent coating for renovating and reinforcing the exterior wall ceramic tile surface, the interface treating agent and matched intermediate coat and finish coat are adopted, and a long-term stable and attractive decoration system can be constructed through the synergistic effect of the three coatings.

The application relates to a modified polyimide pipe and a preparation method and application thereof. The preparation method of the modified polyimide pipe comprises the following steps: modifying graphite oxide powder with an organic amine to obtain graphite oxide powder with amino groups; modifying the graphite oxide powder with amino groups with a silane coupling agent and / or a dianhydride to prepare modified graphite oxide powder; mixing the modified graphite oxide powder with a polyamide acid solution to prepare a mixed solution; coating a core material with the mixed solution, then performing imidization reaction and core extraction to prepare the modified polyimide pipe. The preparation method of the modified polyimide pipe can improve the mechanical properties and lubricating properties of the polyimide, and the outer surface is smooth.

The invention belongs to the field of heat-conducting polymer composite materials, and particularly relates to a high-heat-conductivity PEEK / PEI super-tough composite insulating material as well as a preparation method and application thereof. The high-thermal-conductivity PEEK / PEI super-tough composite insulating material contains polyether-ether-ketone, polyetherimide, a heat conduction agent, a compatilizer, an optional flexibilizer, an optional antioxidant and an optional lubricant. The heat conduction agent contains nano-scale aluminum oxide, micron-scale aluminum oxide and coated carbon fibers, and the coated carbon fibers comprise carbon fibers and hydroxyethyl methylacrylate-dimethylaminoethyl acrylate copolymers coating the surfaces of the carbon fibers. The high-thermal-conductivity PEEK / PEI super-tough composite insulating material provided by the invention has high toughness, thermal conductivity and insulativity at the same time.

The utility model discloses a metro station prefabricated water retaining ridge, an off-wall ditch water retaining ridge structure and a metro station structural slab reserved hole water retaining ridge structure, and belongs to the technical field of metro station drainage. The prefabricated water retaining ridge for the subway station is characterized by comprising a water retaining ridge body which is prefabricated by adopting reinforcing steel bars and concrete and has an L-shaped section, one right-angle side of the water retaining ridge body is a base, the other right-angle side of the water retaining ridge body is a vertical back, the bottom of the base is provided with an inward groove which extends from one end of the base to the other end of the base, and the water retaining ridge body is provided with an opening. The two ends of the base are each provided with a bolt hole, and a grouting hole communicated with the inward groove is formed in the middle of the upper portion of the base. The prefabricated water retaining ridge is simple in structure, good in overall stability, easy to install, convenient to construct and good in adaptability to site construction conditions.

The invention relates to the related technical field of brake friction materials, in particular to a caragana microphylla fiber reinforced light copper-free brake friction material and an operation method thereof. The friction material is composed of caragana microphylla fibers, sepiolite fibers, composite mineral fibers, phenolic resin, crystalline flake graphite, petroleum coke, aluminum oxide, friction powder, calcium carbonate, vermiculite powder, precipitated barium sulphate, zinc stearate and other functional components. Wherein the caragana korshinskii fibers have multiple excellent properties such as low density, high specific strength, environmental friendliness and reproducibility, the economic value of caragana korshinskii crops can be improved while the performance of the friction material is improved and the lightweight requirement is met by introducing the caragana korshinskii fibers into the resin-based brake friction material, and the economic value of the caragana korshinskii crops can be improved by adopting a method of combining alkali treatment and coupling agent treatment. The mechanical strength of the caragana microphylla fiber and the interface bonding strength of the caragana microphylla fiber and a resin matrix are improved, so that the enhancement potential of the caragana microphylla fiber is exerted, and the comprehensive performance of the friction material is optimized.

The application belongs to the technical field of nylon composite materials, and particularly relates to a high-lubrication composite material, a preparation method and a composite gear. A high-lubrication composite material is prepared by in-situ polymerization of carbon nanotubes uniformly dispersed in modified PA6, wherein the carbon nanotubes are double-coated by polyethylene glycol-polypropylene glycol copolymer and polyacrylate, polyethylene glycol is used as a promoter, and caprolactam is used as a monomer, and the modified PA6 is blended with polyphenylene sulfide, SEBS-g-MAH, a heat stabilizer and an antioxidant in proportion to obtain the high-lubrication composite material. The prepared high-lubrication composite material has the characteristics of excellent mechanical properties, strong impact resistance and good friction resistance, and is suitable for preparing a composite gear.

This invention discloses a hydrophobic nano-silica modified basalt fiber and its preparation method. The method includes using basalt fiber as a matrix, introducing silicon-oxygen bonds through hydrolysis and condensation with a silane coupling agent, and then constructing a "micro-nano dual structure" through chemical bonding and physical adsorption of hydrophobic nano-SiO2. The hydrophobic nano-SiO2 is trimethylchlorosilane-modified gas-phase SiO2. The preparation process includes three steps: fiber pretreatment, silanization treatment, and nano-SiO2 grafting. By optimizing parameters such as ultrasonic power, reaction temperature, and dispersion concentration, the surface roughness of the modified basalt fiber is improved, enhancing the interfacial adhesion between the basalt fiber and the asphalt matrix. The method is simple and controllable, suitable for asphalt pavement engineering, and improves its durability.

The invention discloses a high-performance PVC foam adhesive tape and a preparation method thereof, and relates to the field of foam adhesive tapes, and the high-performance PVC foam adhesive tape sequentially comprises a release film layer, an adhesive layer I, a PVC foam layer and an adhesive layer II from bottom to top. Wherein the PVC foam layer is made of a PVC material, and the PVC material comprises the following raw materials in parts by weight: 70-80 parts of PVC resin, 15-20 parts of a plasticizer, 1-2 parts of a stabilizer, 3-5 parts of a foaming agent, 5-7 parts of a filler and 2-3 parts of functional montmorillonite. The raw materials such as the functional montmorillonite, the plasticizer and the stabilizer are used in a combined manner, so that the PVC foam layer has relatively high low-temperature impact resistance and ultraviolet aging resistance, and has relatively high interface adhesiveness with the adhesive layer I and the adhesive layer II. The PVC foam tape prepared by the invention has relatively high stripping force on base materials such as ABS, glass, steel plates and the like, and is high in ultraviolet aging resistance.

The invention discloses a multifunctional battery diaphragm, a preparation method thereof, an electrochemical device and application, and belongs to the technical field of battery diaphragms. The multifunctional battery diaphragm comprises a base membrane and functional coatings coated on the two sides of the base membrane, the functional coatings comprise microsphere binders, inorganic particles and functional auxiliaries, and the microsphere binders are composed of acrylate monomers, divinyl benzene monomers, 4, 4 '-divinyl benzene monomers, 2, 4'-divinyl benzene monomers, 2, 4 '-divinyl benzene monomers, 2, 4'-divinyl benzene monomers and 2, 4 '-divinyl benzene monomers. The polymer is prepared from 4, 4 '-biphenyl diacrylate and 1-(3-sulfo propyl)-2-vinylpyridine inner salt through emulsion copolymerization reaction. The two sides of the base membrane are coated with the functional coatings, the functional coatings comprise the microsphere binder, the inorganic particles and the functional additive, and the quadripolymer serves as the microsphere binder and acts together with the inorganic particles and the functional additive, so that the diaphragm has excellent peel strength, electrolyte wettability and high temperature resistance.

The application discloses a kind of anti-chlorine salt erosion rubber modified asphalt pavement pit slot repair composite process, in view of the interface peeling caused by chlorine salt erosion in traditional repair process, short repair life problem, innovatively proposes the three-stage repair system of "debridement-interface activation-bionic filling": (1) rough interface is formed by using high-pressure cyclone debridement device to remove loose debris;(2) spray anti-chloride bonding layer containing nano-silane coupling agent, the depth of penetration reaches 3-5mm, forms chemical barrier;(3) layered filling rubber modified asphalt mixture, the gradient compaction is implemented in 30-50Hz of adjustable frequency vibrating road roller.The application improves the interface strength by molecular bonding and mechanical interlocking dual action, realizes the dual anchoring of chemical bonding and mechanical engagement effect of repair layer and original pavement, improves the interface bonding strength, prolongs the service life of repair layer, effectively solves the technical problem that pit slot repair layer is easy to debond and fails in chlorine salt environment, and is suitable for the rapid repair of pavement diseases in coastal areas and road sections where deicing agent is used a lot in winter.

The application provides a direct injection type asphalt modifier, a dry modified asphalt mixture and a preparation method thereof, and belongs to the technical field of new road materials, and is used for solving the problems of dust pollution, material segregation, poor mixture uniformity and damaged road performance caused by the "post-added mineral powder" process in the application process of the existing direct injection type asphalt modifier. The direct injection type asphalt modifier is in a granular form, and comprises the following components in parts by weight: 10-20 parts of polyurethane, 1-5 parts of asphalt and 50-80 parts of mineral powder; the polyurethane is obtained by mixing and reacting a polyurethane prepolymer and a polyol component, and the molar ratio of NCO groups to OH groups in the polyurethane is 1.01-1.1:1. The direct injection type asphalt modifier combines the polymer component (polyurethane) for modification and the mineral powder component for filling, can perform the dual functions of "asphalt modification" and "mineral powder filling", and avoids the step of "post-added mineral powder".

The application discloses a high-safety solid-state lithium battery based on an ionic gel interface layer and belongs to the field of solid-state lithium battery preparation, and specifically comprises a pole core, and the positive pole sheet interface, the negative pole sheet interface and the pores of each layer in the pole core are filled with the ionic gel interface layer. The application is synthesized by adding 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to a double bond to end-capped synthesis of fluorine-containing flame-retardant bifunctional polyether crosslinking agent, and the crosslinking agent is injected into a dry battery together with a cyclic carbonate-based methacrylate compound and an electrolyte. After vacuum infiltration, in-situ thermal polymerization is initiated to build a three-dimensional crosslinking network to lock free electrolyte, form a conformal ionic gel interface layer, and significantly improve the safety performance and long-cycle performance of the solid-state lithium battery.

This invention discloses a high-density, high-strength "three-layer structure" carbon-based composite material and its preparation method. The method includes: mixing activated coke with a D50 of 3-6 μm and microcrystalline graphite powder with a D50 of 10-60 μm to obtain a mixed powder; kneading the mixed powder in a kneading pan, removing moisture, heating to 160-240℃, then adding a molten binder or modified binder, and simultaneously adding a modifier, followed by kneading with the lid closed; after kneading, pouring the mixture into a rolling mill for rolling, then crushing and sieving to obtain pressed powder; vacuum-treating the pressed powder, then molding and isostatically pressing to obtain green blocks, and finally calcining to obtain the carbon-based composite material. This invention has a short production cycle and low cost. The carbon-based composite material obtained has a one-layer interface structure, a two-layer brazed structure, and a three-layer steel-concrete structure. The special "three-layer" structure design achieves a dual effect of "reinforced aggregate complementarity + micro-active layer construction," which can effectively improve the bulk density, mechanical strength, homogeneity, and stability of the carbon-based composite material.

The application discloses a boehmite-coated diaphragm and a preparation process thereof in the field of lithium ion battery diaphragms, and the diaphragm raw materials comprise ultrapure water, a dispersing agent, boehmite, a thickening agent, butadiene styrene rubber, lithium acrylate, a wetting agent, a fluorine-siloxane-sulfonic acid group copolymer and a five-arm polyamide-polyphosphate star copolymer. The fluorine-siloxane-sulfonic acid group copolymer is prepared by polymerization of multi-monomers such as trifluoroethyl methacrylate, gamma-(methacryloyloxy) propyl trimethoxysilane and 2-acrylamido-2-methylpropane sulfonic acid. During preparation, the boehmite is mixed and ground with the dispersing agent, the thickening agent and the like to form a slurry, two kinds of modified copolymers and other functional components are added to adjust the performance, and after coating, drying and rolling, the coated diaphragm is formed. The synergistic effect of the two kinds of copolymers significantly improves the thermal stability, electrolyte wettability and interface bonding force of the diaphragm with the base film, effectively solves the comprehensive performance bottleneck of the traditional diaphragm, and is suitable for the field of high-performance lithium ion batteries.

An underwater anti-dispersion ultra-high performance concrete based on reversible network design, its preparation method, and its application. The ultra-high performance concrete comprises cementitious materials, water, polycarboxylate superplasticizer, and a synergistic anti-dispersion composite admixture; wherein the composite admixture consists of a main agent and auxiliary agents. The main agent and auxiliary agents are used to construct a three-dimensional reversible network structure with significant thixotropic properties in situ within the slurry, endowing the slurry with intelligent rheological properties of "shear thinning—static thickening": the yield stress reaches 50–320 Pa at rest to resist underwater erosion, and the plastic viscosity is maintained at 2–8 mPa·s during shearing to ensure pumpability. This invention effectively solves the problem of balancing rheological properties and anti-dispersion properties in ultra-high performance concrete systems, and is particularly suitable for the repair and reinforcement of underwater piers, pile foundations, and tunnel linings.

The application belongs to the technical field of building materials, and relates to low-thermal-conductivity concrete and a preparation method thereof. The application provides a preparation method of low-thermal-conductivity concrete, which comprises the following steps: modifying polypropylene fibers in a tannic acid solution and then modifying the polypropylene fibers in a polydimethylsiloxane solution to obtain modified polypropylene fibers; mixing a foaming agent and water to prepare a foaming solution; uniformly mixing cement, fly ash, the modified polypropylene fibers, an additive and water to obtain a mixture; foaming the foaming solution to generate foam, and then adding the foam into the mixture; and uniformly mixing to obtain the low-thermal-conductivity concrete. The application aims to solve the following technical problem: in the preparation process of foam concrete, although the addition of polypropylene fibers can effectively reduce the thermal conductivity of the foam concrete (to meet the low-thermal-conductivity requirement), the strength of the foam concrete is significantly reduced, and finally the low-thermal-conductivity performance and the high-strength performance of the concrete are difficult to be simultaneously considered.

The invention relates to an antibacterial enhanced PET (Polyethylene Terephthalate) composite material and a preparation method thereof, belongs to the technical field of polymer composite materials, and aims to solve the problems that a PET / PP (Polypropylene) blending system is poor in compatibility, and antibacterial and mechanical properties are difficult to synergistically consider. The composite material is prepared from the following components in parts by weight: 50-90 parts of PET (Polyethylene Terephthalate) resin, 10-50 parts of PP (Polypropylene) resin and 0.1-5.0 parts of a multifunctional modifier, the multifunctional modifier takes nano cellulose whiskers as a rigid framework, and the surface of the nano cellulose whiskers is covalently grafted with a polymer compatible chain segment through a silane connecting arm and is grafted with a long-chain alkyl quaternary ammonium salt antibacterial group. The invention also discloses a preparation process of the multifunctional modifier and the composite material. The composite material has excellent interfacial compatibility, mechanical strength and long-acting antibacterial property.