1319 results about "Mesoporous silica" patented technology

The invention belongs to the technical field of composite coatings, and particularly relates to a corrosion-resistant and ultraviolet-resistant protective coating for wind power generation equipment and a preparation method thereof.The corrosion-resistant and ultraviolet-resistant protective coating for the wind power generation equipment is prepared from, by mass, 40-60 parts of gradient fluorosilicone modified polyurethane resin, 5-12 parts of core-shell type ZnO-coated MOFs composite particles, 1-3 parts of a curing agent, 1-3 parts of a curing agent and 1-3 parts of a curing agent. According to the invention, the problems of poor ultraviolet resistance, poor weather resistance, poor corrosion resistance, poor corrosion resistance, poor corrosion resistance, poor corrosion resistance, poor corrosion resistance and the like in the existing coating and the preparation process thereof are well solved; the shielding layer is single and incapable and has a poor self-repairing effect; and the coating toughness of an epoxy resin system is insufficient and cannot adapt to fatigue deformation of equipment under a vibration working condition.

The invention provides a high-temperature-resistant and high-salt-resistant nano imbibition agent as well as a preparation method and application thereof. The high-temperature-resistant and high-salt-resistant nano imbibition agent is prepared from amination modified mesoporous silica nanoparticles, nano cellulose, rhamnolipid, an anionic surfactant, citrate modified sodium zirconium phosphate, polyethylene glycol-b-polycaprolactone and a sulfydryl-carboxyl imidazoline derivative, therefore, the composite carrier formed by the aminated mesoporous silica nanoparticles and the nanocellulose has high mechanical strength and uniform dispersity, the oil-water interfacial tension is reduced through the synergistic effect of the rhamnolipid and the anionic surfactant, and the crude oil stripping efficiency is remarkably improved; the citrate modified sodium zirconium phosphate enables the salt resistance of the system to be greatly improved, and in a high-temperature and high-salt oil reservoir environment, the nano imbibition agent can remarkably improve the crude oil recovery rate and reduce the injection pressure and dosage; meanwhile, good adsorption resistance is achieved, and reservoir blockage is prevented; in addition, low-toxicity corrosion inhibition components protect equipment, and the service life of an oil well is prolonged.

The invention relates to the field of coatings, in particular to an industrial anticorrosive coating and a preparation method thereof. The coating comprises film-forming resin, a curing agent, a solvent and an anti-corrosion composite nanofiller. The anti-corrosion composite nanofiller has a three-layer structure, wherein an inner core is mesoporous silica loaded with an organic corrosion inhibitor; the middle shell layer is an amino-functionalized metal organic framework material grown in situ; and the outer layer is a low-surface-energy layer formed by modification of a hydrophobic modifier.

The invention relates to a concrete anti-cracking self-repairing agent in the technical field of building materials, and aims to solve the problem that concrete cracks are difficult to self-repair. According to the technical scheme, the self-repairing agent is characterized by comprising a microbial repairing unit formed by ZSM-5 type zeolite molecular sieve loaded bacillus pasteurii spores, mesoporous silica particles loaded with L-calcium aspartate and Fe3O4 (at) SiO2 core-shell nanoparticles which are fixed through an in-situ polymerization coating layer to form a magnetic thermal response capsule layer coating the surface of the microbial repairing unit, pLGA microspheres containing yeast extract are positioned on an interface of zeolite and hydrogel, and a trehalose-anhydrous calcium chloride eutectic compound is used as a directional mineralization accelerant. The concrete anti-cracking self-repairing agent provided by the invention is mainly used for intelligent identification and self-repairing of concrete cracks, and efficient repairing is realized through a microbial mineralization, calcium ion slow release and magnetic thermal response synergistic mechanism.

The invention discloses an antibacterial corrosion-resistant coating and a preparation method thereof, and relates to the field of coating materials. The coating is prepared from the following components in percentage by mass: 2 to 5 percent of nano silver ion loaded mesoporous silicon dioxide nano particle antibacterial aid, 5 to 10 percent of zinc powder-containing corrosion inhibitor, 3 to 8 percent of nano montmorillonite, 30 to 40 percent of modified epoxy resin, 20 to 30 percent of polyurethane prepolymer and other aids. The nano silver ion antibacterial auxiliary agent is loaded in mesoporous silica nanoparticles through an ion exchange method, the zinc powder corrosion inhibitor is prepared through stirring and ball milling dispersion, and the modified epoxy resin is modified by adopting a silane coupling agent. The preparation process of the coating comprises the stages of premixing, grinding and refining, initiating polymerization and post-treatment, wherein a grinding medium is zirconium oxide beads with the diameter of 0.5-2 mm. The coating has excellent antibacterial and corrosion-resistant performance, is suitable for metal surface protection, and can effectively solve the problems that an existing coating is not lasting in antibacterial effect, insufficient in corrosion-resistant performance and not ideal in comprehensive performance.

The invention relates to the field of anticorrosive paint, in particular to anticorrosive paint containing lanthanum cerium oxide and a preparation method of the anticorrosive paint. The invention relates to an anticorrosive coating containing lanthanum cerium oxide. The anticorrosive coating is prepared from the following raw materials: 28 to 45 parts of ultraviolet stable composite film forming matter, 5 to 10 parts of composite rare earth filler, 6 to 12 parts of supported synergistic antirust agent, 18 to 30 parts of mixed solvent, 0.8 to 2.5 parts of dispersing agent, 2.7 to 5.3 parts of functional additive and 0.5 to 1.2 parts of nano montmorillonite, the composite rare earth filler is lanthanum cerium oxide-hydroxyapatite composite powder with a core-shell structure, wherein lanthanum cerium oxide is used as a core, hydroxyapatite is used as a shell, and the thickness of the shell layer is 10-20 nm; the ultraviolet stable composite film forming substance comprises epoxy resin and ultraviolet grafting modified polyurethane in a weight ratio of 1: (0.6-2.2); the supported synergistic antirust agent is a mixture of mesoporous silica supported benzotriazole and zinc molybdate. And the obtained coating is high in adhesive force and long in service life.

The invention relates to the technical field of medical dressings, in particular to a perianal drug dressing of a multi-layer flow guide composite fabric and a preparation method and application of the perianal drug dressing of the multi-layer flow guide composite fabric. The perianal drug dressing is of a four-layer structure, a wet tissue adhesion layer is made of polydopamine modified chitosan / oxidized hyaluronic acid hydrogel, and wet-state adhesion is achieved; the drug sustained-release layer is used for dispersing mesoporous silica loaded with ciprofloxacin hydrochloride / defensin and chitosan microspheres loaded with epidermal growth factors / lonicera japonica into a polycaprolactone fiber membrane to achieve synergistic antibacterial and healing promotion; the directional flow guide layer is of a gradient wettability sandwich structure with a bionic micro-channel, and one-way rapid drainage can be achieved; the high-absorption outer layer is carboxymethyl cellulose / sodium polyacrylate composite sponge, liquid is locked efficiently, the wound surface is kept dry and comfortable, the clinical problem in perianal infection wound treatment can be effectively solved, and the treatment effect and the patient comfort are remarkably improved.

The invention relates to the technical field of catalyst materials, and particularly discloses a high-stability hydrogenation catalyst and a preparation method thereof. The invention relates to a preparation method of a high-stability hydrogenation catalyst, which comprises the following steps: preparing a hollow porous microsphere as an inner core from amino-terminated hyperbranched polyaryletherketone and polyvinyl alcohol, and then coating the porous microsphere with a mesoporous silicon dioxide intermediate layer by a sol-gel method; and finally, forming an Mg-Al hydrotalcite layer on the outermost side through a coprecipitation method, dipping and modifying with La (NO3) 3 and Ce (NO3) 3 solutions to obtain a catalyst carrier, dipping the catalyst carrier in an active metal dipping solution, and drying to obtain the catalyst. The high-stability hydrogenation catalyst provided by the invention has excellent mechanical properties and more reaction active sites, has high catalytic activity and catalytic efficiency, and is relatively long in catalytic life.

The invention relates to the field of caprolactam production, and discloses a green and efficient production process and device. The process comprises the following steps: continuously oximating cyclohexanone and hydroxylamine in a microreactor under the catalysis of mesoporous silica solid acid; carrying out gas phase rearrangement on cyclohexanone-oxime in the presence of a ZSM-5 molecular sieve under the assistance of microwaves; coupling, rectifying and purifying the crude product through a four-stage molecular sieve membrane; and performing catalytic cracking on the by-product to obtain N2 / H2O and recycling. The device comprises a micro-reaction unit, a microwave-radial reactor, a membrane coupling rectifying tower group and a tail gas cracking unit. Zero emission of ammonium sulfate is achieved, the product purity is larger than or equal to 99.95%, and energy consumption is reduced by 45%.

This invention belongs to the field of polymer material reinforcement and toughening, specifically relating to a spiked-mesoporous silica nanosphere, its preparation method, and its application in polymer material reinforcement and toughening. The basic steps for synthesizing this spiked-mesoporous silica nanosphere include: firstly, synthesizing low-crosslinked, smooth-surfaced mesoporous silica nanospheres through an oil-water two-phase reaction system; subsequently, inducing normal shrinkage of the pore walls through secondary deep crosslinking to form a rigid nanospike surface structure while maintaining the original mesoporous structure. This spiked-mesoporous silica nanosphere exhibits good monodispersity, high particle size uniformity (50-100 nm adjustable), centrally divergent mesopores with high pore size uniformity (6-8 nm adjustable), highly open pores on the sphere surface, and spike height adjustable from 3-5 nm. This material is suitable for reinforcing and toughening various elastomers, resins, and other polymer materials, effectively overcoming the "strength-toughness mutual exclusion" problem and synergistically enhancing existing mechanical property reinforcement systems.

The invention discloses an M2M-SeMSN-coated C176 nano-particle, a preparation method and application thereof, the nano-particle comprises an STING inhibitor C176 and a carrier, and the carrier is based on an M2 macrophage membrane and a selenium-bridged mesoporous silica nano-particle. Specifically, the M2M-SeMSN-coated C176 nano-particles are obtained by loading an STING inhibitor C176 by using a selenium-bridged mesoporous silica nano-particle SeMSN and M2 macrophage cell membrane. The invention further discloses a preparation method of the M2M-SeMSN-coated C176 nano-particles. The M2M-SeMSN-coated C176 nanoparticles can be used for preparing a medicine for treating acute kidney injury.

The invention discloses a method for preparing 12-mercaptan through solid organic acid catalysis, belongs to the technical field of 12-mercaptan preparation, and aims to solve the problems of low catalyst activity, harsh reaction conditions, serious pollution, high cost and dependence on import in the prior art. N-dodecanol and hydrogen sulfide are used as raw materials and are mixed according to the molar ratio of 1: 1.2-1: 1.3; the method comprises the following steps: gasifying n-dodecanol, mixing with purified hydrogen sulfide, preheating to 210-240 DEG C, introducing into a fixed bed reactor filled with a solid organic acid catalyst, and reacting at-0.08-3.0 MPa for 3.5-4 hours; and cooling and condensing the reaction product, carrying out gas-liquid separation, rectifying and purifying the liquid product to obtain 12-mercaptan with the purity of more than or equal to 99.5%, and recycling unreacted hydrogen sulfide. The solid organic acid can be a catalyst of p-toluenesulfonic acid and the like or mesoporous silica loaded nickel, cobalt and molybdenum metal oxides. The method has the advantages of high catalytic activity, mild reaction conditions, high product yield (the conversion rate of n-dodecanol is greater than or equal to 94.5%), environmental protection and low cost, can realize the domestic mass production of 12-mercaptan, and meets the market demand.

The invention discloses a preparation method and application of washable tin-based perovskite quantum dots, and the preparation method comprises the following steps: mixing cesium iodide powder, tin iodide powder and mesoporous silica powder, and then placing the mixture in a plasma ball mill for ball-milling diffusion, cesium iodide and tin iodide react in a confinement space of mesoporous silica to generate a CsSn I < 3 >-coated SiO2 composite structure, CsSn I < 3 > quantum dots are dispersed and coated in the mesoporous silica, and the application of the tin-based perovskite quantum dots in the anti-ultraviolet textile fabric is provided. The method has the following beneficial effects that the purpose of remarkably improving the stability of the tin-based perovskite quantum dots and the washing resistance of the textile is achieved.

The invention discloses a high-strength modified polyethylene composite fiber and a preparation method thereof, and belongs to the technical field of fiber materials, carboxylated mesoporous silica microspheres are used as a matrix, the surface of the matrix is coated with a graphene sheet layer, then hydroxyethyl methylacrylate is grafted, functionalized graphene / mesoporous silica microspheres are obtained, the functionalized graphene / mesoporous silica microspheres are used as a filler, and the high-strength modified polyethylene composite fiber is prepared. When the polyethylene composite fiber is applied to a ship cable, the overall weight of the ship cable can be reduced, and relative slippage can be generated between graphene lamellas and mesoporous silica microspheres, so that stress is dispersed, and the strength of the polyethylene composite fiber is improved; a hydrophobic alkane long chain is introduced through esterification of the graphene / mesoporous silica microspheres and hydroxyethyl methylacrylate and graft modification of hydroxyethyl methylacrylate, so that the hydrophobic alkane long chain has good compatibility with white oil, and the microspheres are prevented from approaching and gathering by a steric hindrance effect, so that the hydrophobic alkane long chain is more uniformly and stably dispersed in the white oil.

The present invention discloses a method for controlling rice brown planthopper based on sustained-release nano-matrine, belonging to the field of nano-pesticides. In the present invention, matrine is loaded into the mesoporous structure of mesoporous silica, and then encapsulated with chitosan to obtain sustained-release nano-matrine. Then, the sustained-release nano-matrine is formulated into a sustained-release nano-matrine solution, which is then applied as a pesticide to the leaves of rice seedlings to control rice brown planthopper. The sustained-release nano-matrine adopted in the present invention can induce rice seedlings to produce the plant defense hormone jasmonic acid precursor 12-oxophytodienoic acid and the brown planthopper-resistant substances luteolin and cis-aconitine. These substances have a targeted toxic effect and can inhibit the reproduction of offspring, thereby better controlling rice brown planthopper.

The invention provides a nano-drug based on atomic layer deposition and a preparation method of the nano-drug, mesoporous silica is taken as a carrier, bimetallic nanoparticles are precisely deposited through ALD, and chemotherapeutic drugs and antibacterial components are loaded by combining amination and targeted PEG modification, so that the following functions are realized: (1) H2O2 in a tumor microenvironment is catalyzed to generate reactive oxygen species (ROS); removing fusobacterium nucleatum and damaging a biological membrane of the fusobacterium nucleatum; (2) GSH is consumed through Fenton reaction, and tumor drug resistance is reversed; and (3) the drug is released in pH response, and tumor cells are accurately killed. The invention further provides application of the nano-drug based on atomic layer deposition in treatment of related drug-resistant colorectal cancer induced by fusobacterium nucleatum, the process is controllable, the biocompatibility is excellent, the treatment effect on the drug-resistant colorectal cancer is remarkably improved, and the nano-drug has wide clinical application prospects.

According to the high-thermal-conductivity flame-retardant copper-clad laminate and the preparation method thereof, the thermal conductivity and the limit oxygen index of a copper-clad plate can be effectively improved, so that the high-thermal-conductivity flame-retardant property of the copper-clad plate is effectively improved; modified aluminum nitride and phosphoric acid modified aluminum nitride powder in the heat-conducting filler can keep good hydrolysis resistance in the ball milling process; polyvinyl butyral and polyethylene glycol are compounded as a binder, so that the modified aluminum nitride has good sphericity and surface smoothness, and the spherical aluminum nitride prepared by water-based spray granulation is suitable for being used as a heat-conducting filler of a thermal interface material; modified silicon dioxide in the heat-conducting filler adopts cerium-doped hollow mesoporous silicon dioxide nanospheres coated with polydopamine, and a corrosion inhibitor MBT (2-mercaptobenzothiazole) is loaded by the cerium-doped hollow mesoporous silicon dioxide nanospheres; controllable release of the corrosion inhibitor MBT and rare earth cerium ions is achieved, the process of corroding the cathode and the anode can be inhibited at the same time, and the corrosion resistance and the corrosion self-repairing performance of the copper-clad plate can be effectively improved.

The invention belongs to the field of reinforcing and toughening of high polymer materials, and particularly relates to spike-mesoporous silica nanospheres, a preparation method thereof and application of the spike-mesoporous silica nanospheres in reinforcing and toughening of high polymer materials. The method for synthesizing the spur-mesoporous silica nanosphere comprises the following basic steps: synthesizing a smooth-surface mesoporous silica nanosphere with low crosslinking degree through an oil-water two-phase reaction system, and inducing normal shrinkage of a pore wall by utilizing secondary deep crosslinking to form a rigid nano spur surface structure and maintain an original mesoporous structure. The spur-mesoporous silica nanosphere is good in monodispersity, high in particle size uniformity and adjustable in 50-100 nm, has center divergent mesopores, high in pore diameter uniformity and adjustable in 6-8 nm, the pore opening height of the surface of the sphere is open, and the spur height is adjustable in 3-5 nm. The material is suitable for reinforcing and toughening high polymer materials such as various elastomers and resins, can effectively overcome the problem of'toughness mutual exclusion ', and can achieve synergistic interaction with an existing mechanical property reinforcing system.

The invention discloses a waterproof long-lasting oil-control gel composition and a preparation method thereof, and belongs to the technical field of cosmetics. The composition comprises 4-6 parts of an oil absorption compound A, 9-13 parts of an oil absorption compound B and 70-95 parts of a gel matrix, wherein the oil absorption compound A is prepared from mesoporous silica and poloxamer 407, and the aperture of the oil absorption compound A is 5-10 nm; the oil absorption compound B is prepared from polymethyl methacrylate microspheres, isododecane and polyglycerol-3 diisostearate, and the pore diameter of the oil absorption compound B is 150 to 300 nm. According to the invention, through dual mechanisms of temperature response and volatilization driving, a dynamic gradient structure of bottom layer small aperture-surface layer large aperture is formed at skin temperature, and directional migration of grease is realized; meanwhile, the surface property transformation of the material after oil absorption is creatively utilized, a hydrophobic membrane is formed on the surface of the polymethyl methacrylate microsphere, a self-enhanced waterproof barrier is constructed, the unique effect that the more oil is absorbed, the more water is resisted is achieved, the problem of makeup removal caused by sebum and sweat can be effectively solved, and the makeup lasting time is remarkably prolonged.

The invention relates to the technical field of rubber, and relates to a wear-resistant rubber composite material and a preparation method thereof. The wear-resistant rubber composite material is prepared from the following components in parts by weight: 100 parts of a rubber matrix, 30 to 60 parts of multi-stage core-shell structure composite filler, 10 to 15 parts of carbon black, 1.0 to 2.5 parts of a vulcanizing agent, 0.5 to 2.0 parts of an accelerant, 3 to 6 parts of an active agent and 1 to 3 parts of an anti-aging agent, the multi-stage core-shell structure composite filler sequentially comprises a rigid inorganic nano-particle core, a rigid inorganic nano-particle core and a rigid inorganic nano-particle core from inside to outside, the core is coated with the first shell layer, the first shell layer is a mesoporous silica layer, and a silane coupling agent containing sulfur groups is modified in the mesoporous silica layer; and the second shell layer is coated outside the first shell layer and is a hyperbranched polymer layer. According to the wear-resistant rubber composite material provided by the invention, the comprehensive mechanical property and wear resistance of the rubber composite material are improved.

The invention discloses a preparation method and application of a sophocarpidine nano-pesticide, dendritic mesoporous silica nanoparticles are ultrasonically dispersed in a methanol solution of sophocarpidine, the mixture is stirred for 45-50 h in a dark place at 10-30 DEG C for a reaction, after the reaction, precipitates are centrifugally collected, washed and freeze-dried, and the sophocarpidine nano-biopesticide is obtained. The sophocarpidine nano biopesticide is prepared by taking dendritic mesoporous silica nanoparticles as a carrier, and dendritic mesoporous silica is of a dendritic mesoporous structure and has the characteristics of larger porosity, uniform particle size, high drug loading rate, slow control effect and the like. The dendritic mesoporous silica has the advantages that the dendritic mesoporous silica can be used for preventing and treating trunk-boring, basal and root-eating pests, the matrine as a biological pesticide can avoid the problems of photolysis and the like after being loaded into the dendritic mesoporous silica, the prevention and treatment effect is improved, the drug resistance of the pests is reduced, the goals of reduction and synergism are achieved, and a new thought is provided for sustainable prevention and treatment.

The invention relates to a method for packaging perovskite quantum dots by photon sintering. The preparation method comprises the following steps: firstly, preparing turbid liquid of mesoporous silica nanoparticles; coating the surface of a substrate with the obtained turbid liquid, and drying to form a layer of uniform mesoporous silica nanoparticle array on the surface of the substrate; immersing the obtained substrate into a perovskite precursor solution, and carrying out ultrasonic treatment and crystallization to obtain a quantum dot crystallized substrate; and carrying out photon sintering packaging to obtain the perovskite quantum dots. According to the invention, mesoporous silica nanoparticles are used as a packaging material, a porous structure is used for confinement growth, quantum dots are uniformly dispersed in a submicron scale, accurate size control is realized, and quantum dot agglomeration is avoided. A photon sintering process is used, and packaging of quantum dots is realized through rapid energy transfer. According to the process, sintering can be completed at the millisecond level, surface traps and oxidation reactions possibly introduced in the traditional thermal annealing process are reduced, and the optical performance and stability of the quantum dots are further improved.

The invention discloses an antihypertensive material for subcutaneous implantation and a preparation method of the antihypertensive material, and belongs to the technical field of biomedical materials. The antihypertensive material comprises a carrier material and a drug mixture loaded on the carrier material according to a mass ratio of (10-15): (5-8), and the carrier material comprises the following raw materials: polylactic acid-glycolic acid copolymer, citric acid-chitosan ester, genipin and a silicon dioxide active material. The silicon dioxide active material is obtained by compounding mesoporous silicon dioxide nanoparticles and a collagen coating on the surface of the mesoporous silicon dioxide nanoparticles. According to the antihypertensive material disclosed by the invention, a degradable skeleton is provided by the polylactic acid-glycolic acid copolymer, citric acid-chitosan ester is used as a toughening agent and an antibacterial material, genipin is used as a cross-linking agent, and a mesoporous structure of a silicon dioxide active material is used for loading a medicine; the problems that an existing subcutaneous implant material is high in burst release rate, poor in mechanical property, insufficient in biocompatibility and the like are solved.

The invention relates to the technical field of biological separation materials, and discloses an amine-functionalized magnetic nano composite material and application thereof in protein separation and purification. The material has a core-shell structure and comprises a magnetic ferroferric oxide nano core, an ordered mesoporous silicon dioxide intermediate layer and a covalent grafted polyethyleneimine functional layer. By controlling the matching relationship between the pore diameter of mesopores and the molecular size of the polymer and adopting a crosslinking strategy, the material has high magnetic responsiveness, rapid mass transfer performance and high-density surface amino groups. The material shows high adsorption capacity, rapid adsorption kinetics and good cycle stability in the protein separation process, and is suitable for enrichment purification and metal chelating affinity separation of protein in a biological sample. According to the invention, the technical problems of low protein adsorption capacity, slow dynamics and poor cycling stability caused by compact shell layer, non-uniform amino distribution and limited mass transfer of the existing amine functionalized magnetic material are solved.

The invention provides a viscose aerogel fiber with a skin-core structure and a preparation method and application thereof.The viscose aerogel fiber comprises a skin layer and a core layer, the raw materials of the core layer comprise mesoporous silica, a two-dimensional nano material and viscose A. The raw materials of the skin layer comprise a silane coupling agent and viscose B, through the design of the components of the skin layer and the core layer and the regulation and control of the structures, on the premise that the flexibility and the spinnability of the viscose fiber are kept, the obtained viscose aerogel fiber can have both high heat insulation property and excellent mechanical stability.

The invention relates to the technical field of concrete crack repairing agents, in particular to a triggered precipitation type concrete crack repairing agent as well as a preparation method and application thereof. The repairing agent is prepared from the following raw materials: sulphoaluminate cement, nano anhydrite with a core-shell structure, fluorine-phosphorus composite seed crystal, magnesium oxide, metakaolin and a water reducing agent, wherein the core-shell structure nano anhydrite is prepared by coating mesoporous silica with nano anhydrite, and the fluorine-phosphorus composite seed crystal is prepared from calcium fluoride and monocalcium phosphate through a hydrothermal reaction. According to the trigger precipitation type concrete crack repairing agent prepared by the invention, sulfate ions are slowly released through the core-shell structure nano anhydrite, the crystal form of ettringite is regulated and controlled through the fluorine-phosphorus composite seed crystal, the problems that a traditional repairing agent shrinks and falls off in the later period, the high-temperature strength is suddenly reduced, and the binding power is insufficient are solved, and the trigger precipitation type concrete crack repairing agent is suitable for concrete structure crack repairing and high-temperature environment engineering.

The invention relates to the technical field of carbon dioxide capture, and discloses a carbon dioxide absorbent and a preparation method thereof, and the carbon dioxide absorbent comprises the following components by weight: 10-15 parts of diethylenetriamine and 2-3 parts of modified mesoporous silica. According to the invention, through a synergistic adsorption mechanism of diethylenetriamine and modified mesoporous silica, a relatively good CO2 capture capability is realized; the cage-shaped structure of the modified mesoporous silica has a high specific surface area and ordered pore channels, and provides sufficient loading sites and diffusion channels for diethylenetriamine; meanwhile, an amino auxiliary (containing a plurality of primary amine and secondary amine groups) introduced in the modification process and a polyamine structure of diethylenetriamine form an amino cluster, and a better adsorption effect is achieved.

The invention discloses a moisture-absorbing and sweat-guiding polyester fabric and a preparation method thereof, and relates to the technical field of high-performance fiber fabrics. The invention discloses a moisture-absorbing and sweat-guiding polyester fabric which comprises moisture-absorbing and sweat-guiding polyester fibers. The moisture-absorbing and sweat-guiding polyester fiber contains 5-12wt% of cool-feeling particles; the preparation method comprises the following steps: firstly, depositing mesoporous silica on the surface of a base material by using a pretreated mica sheet to obtain modified particles; coating the modified particles with a binary phase change material to obtain core-shell particles; and finally, carrying out hydrophilic treatment on the surfaces of the core-shell particles to obtain the cool-feeling particles. The cool particles are added into polyester, so that the polyester material is endowed with instantaneous cool performance, and the polyester is endowed with moisture absorption and sweat guide performance. The polyester fabric prepared by weaving the moisture-absorbing and sweat-guiding polyester fibers has good wearability.

The invention discloses high-barrier waterproof and oil-proof meal package paper and a preparation method thereof, and relates to the technical field of food packaging materials. The invention discloses a preparation method of high-barrier waterproof and oil-proof meal package paper, which comprises the following steps: coating raw paper with waterproof and oil-proof glue to obtain the high-barrier waterproof and oil-proof meal package paper, the waterproof and oil-proof glue comprises the following raw materials in percentage by weight: 1-2% of modified chitosan, 4-5% of carboxymethyl cellulose, 0.3-0.5% of nano cellulose, 0.15-0.25% of modified nano mesoporous silica, 0.3-0.42% of a bio-based cross-linking agent and the balance of a solvent, and the sum of the weight percentages of the raw materials is 100%. The prepared meal package paper is good in waterproof and oil-proof effects, and the folding strength of the coating is high.

The invention provides a mesoporous silicon-aluminum molecular sieve catalyst, a preparation method and application thereof, and a polyolefin plastic catalytic hydrogenolysis method. The mesoporous silicon-aluminum molecular sieve catalyst comprises a carrier and an active component loaded on the carrier, the carrier comprises a mesoporous silicon-aluminum molecular sieve, and the active component comprises at least one of ruthenium, rhodium and platinum; the total mass of the mesoporous silicon-aluminum molecular sieve catalyst is 100%, the mass content of the active component is 3-7%, and the mass content of SiO2 in the mesoporous silicon-aluminum molecular sieve is 5-28%; the mass ratio of SiO2 to Al2O3 in the mesoporous silicon-aluminum molecular sieve is 0.06 to 0.4. The catalyst can realize high-activity and high-selectivity catalytic hydrogenolysis of polyolefin plastic under mild conditions.