51 results about "N-n-propylacrylamide" patented technology

The invention belongs to the technical field of thermoelectric materials and functional polymer materials, and particularly relates to thermoelectric hydrogel based on synergistic enhancement of zwitterions and a polar solvent as well as a method and application of the thermoelectric hydrogel. The thermoelectric hydrogel is obtained through the steps that a precursor solution is subjected to a polymerization reaction to form a gel matrix, then the gel matrix is soaked in a soaking solution, potassium ferricyanide / potassium ferrocyanide redox couple is introduced, and the thermoelectric hydrogel is obtained, and the precursor solution is prepared from acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide and N, N-dimethylformamide. The photoinitiator is prepared by mixing N, N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, a zwitterionic monomer [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, a cross-linking agent N, N '-methylene bisacrylamide, a photoinitiator and deionized water. The thermoelectric hydrogel prepared by the invention has high mechanical strength, high ductility and high Seebeck coefficient, and has better temperature resistance.

The invention provides a surface active polymer as well as a preparation method and application thereof, and belongs to the technical field of functional high-molecular compounds. The surface active functional monomer, N-isopropylacrylamide, acrylamide, [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, an initiator and water are subjected to a polymerization reaction in a catalyst system, and the surface active polymer is obtained. The surface active polymer prepared by the invention has excellent temperature resistance and salt tolerance, and can realize rapid and reversible conversion of'high-temperature emulsification and low-temperature demulsification 'under temperature stimulation.

The invention discloses a pH and temperature dual stimulation response controlled release curcumin nano-pesticide and a preparation method and application thereof.The nano-pesticide comprises a carrier and curcumin loaded on the carrier, the carrier is N-isopropylacrylamide modified mesoporous silica, and the curcumin is a mixture of N-isopropylacrylamide modified mesoporous silica and N-isopropylacrylamide modified mesoporous silica and N-isopropylacrylamide modified mesoporous silica. N, N-isopropylacrylamide is polymerized on the surface of mesoporous silica through a polymerization reaction, and the preparation method comprises the following steps: (1) preparing a curcumin solution, adding modified mesoporous silica powder, fully dispersing, and slowly stirring at 20-25 DEG C under a dark condition until all white nanoparticles become yellow; and (2) collecting the nano-particles in the solution in the step (1), and drying to obtain the modified mesoporous silica drug-loaded particles. According to the curcumin nano-pesticide disclosed by the invention, the carrier N-isopropylacrylamide modified mesoporous silica is introduced, so that the stability, the leaf surface adhesion capability and the bactericidal performance on alternaria longibrachiata of curcumin are improved.

The invention relates to the technical field of ultra-fine oilstones, in particular to an ultra-fine oilstone and a preparation method thereof.The preparation method comprises the steps that calcined and KH-570 modified diatomite is dispersed in water, a monomer N-isopropylacrylamide, a free radical initiator and an accelerant TEMED are added, the mixture is stirred and reacted for 1-10 h at the room temperature, sediment is filtered out, the sediment is leached with cold water and then dispersed in a polyethylene glycol aqueous solution, and the ultra-fine oilstone is obtained; and then adding the grinding material and the glass powder, heating to 40-60 DEG C, stirring and mixing for 10-60 minutes, filtering, pressing and drying the obtained solid in a mold, and finally sintering.

This invention discloses a method for preparing a biomimetic actuating material based on inkjet printing patterned construction of a reed inner membrane hydrogel composite. The method includes inkjet printing a reed inner membrane; adding N-isopropylacrylamide, N,N-methylenebisacrylamide, and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylacetone to an aqueous solution of nano-clay to obtain a hydrogel prepolymer; placing the inkjet-printed reed inner membrane on a glass slide, adding the hydrogel prepolymer, covering and sealing it, and then placing it in ice water for photopolymerization to obtain the reed inner membrane hydrogel composite biomimetic actuating material. This invention uses an inkjet printer to print pigment ink onto the surface of a natural reed inner membrane for patterning, and then rapidly forms a strong mechanical interlocking structure with poly(N-isopropylacrylamide) hydrogel, resulting in strong bonding. The method is simple, and the actuating material exhibits excellent photothermal conversion efficiency, mechanical properties, and patterning capabilities, thereby enabling rapid actuation, ultra-high power actuation, and various complex biomimetic actuator designs.

This invention relates to the field of polymer materials technology and provides a high-performance PVDF ultrafiltration membrane and its preparation method, comprising the following steps: dissolving PVDF in a solvent, adding ethyl 2-bromoisobutyrate, CuBr / tris-(2-dimethylaminoethyl)amine and N-isopropylacrylamide for reaction; subsequently adding polyethylene glycol methacrylate, heating and reacting, followed by precipitation and drying to obtain a triblock copolymer; mixing the triblock copolymer with PVDF, adding it to a mixed solvent containing ionic liquid, dissolving and degassing to obtain a casting solution; casting the casting solution onto a substrate, coating it using a temperature-controlled doctor blade, then immersing the substrate in a coagulation bath, and after coagulation, washing and drying to obtain the PVDF ultrafiltration membrane. The ultrafiltration membrane has high flux and good retention rate, and also exhibits good temperature-sensitive response performance.

The invention belongs to the technical field of concrete, and discloses an anti-mud viscosity reduction type polycarboxylic acid water reducer as well as a preparation method and application thereof. The anti-mud viscosity reduction type polycarboxylic acid water reducer is prepared from the following raw materials in parts by weight: 150 to 300 parts of polyether monomer, 25 to 50 parts of unsaturated monomer, 5 to 15 parts of functional monomer, 3 to 8 parts of temperature-sensitive monomer, 0.8 to 1.5 parts of chain transfer agent, 0.5 to 5 parts of oxidant and 0.1 to 0.5 part of reducing agent. The functional monomer is a zwitterionic hybrid monomer with a boric acid group and a betaine group. According to the invention, the zwitterionic hybrid monomer with a boric acid group and a betaine group is added into the water reducing agent as a functional monomer, and N-isopropylacrylamide is added as a temperature-sensitive monomer, so that the mud resistance and viscosity reduction performance of the water reducing agent are realized.

The present application provides a kind of temperature-sensitive amidoxime modified bacterial cellulose hydrogel and its preparation method, it is related to novel adsorbent material technical field.The present application is prepared by gradient temperature method after the amidoxime modification of bacterial cellulose and certain proportion of temperature-sensitive monomer N-isopropyl acrylamide, initiator 2,2'-azo (2-methylpropylimid) dihydrochloride and crosslinking agent N,N-methylene bisacrylamide to obtain hydrogel.Among them, the amidoxime modification of bacterial cellulose improves the uranium adsorption capacity and the selectivity to uranium, and after the preparation of hydrogel, the addition of temperature-sensitive monomer also speeds up the adsorption rate of hydrogel to uranium.The preparation method is simple and fast, and the cost is low;The modified hydrogel material has good temperature sensitivity, high adsorption efficiency, high selectivity and can be reused repeatedly.

The invention belongs to the technical field of cement production and processing, and particularly relates to a grinding aid for cement processing and a preparation process thereof. Vinyltrimethoxysilane, 2-hydroxyethyl acrylate, N-isopropylacrylamide, acrylic acid and methylallyl polyoxyethylene ether are subjected to free radical polymerization reaction under the action of a redox initiator to prepare the grinding aid for cement processing, and through the synergistic effect of polyfunctional groups, the grinding aid can be used for cement processing. The adsorption capacity of the grinding aid and cement particles is improved, so that the dispersity of cement is improved, and good grinding aid efficiency is realized; modified nano aluminum oxide is added into the grinding aid for cement processing, the nano-scale particle size of the modified nano aluminum oxide is used as micro balls, gaps of cement particles are filled with the micro balls, collision and friction among the particles are reduced, the grinding resistance is reduced, the grinding efficiency is improved, and in the subsequent hydration process of cement, the modified nano aluminum oxide is used as a potential crystal nucleus to promote generation and growth of C-S-H gel; the strength of a cement product is improved.

The invention belongs to the field of electrochemical energy storage, and particularly relates to a poly (N-hydroxypropyl acrylamide) / hydroxypropyl pachymaran / calcium chloride hydrogel-based polymer electrolyte and a flexible integrated supercapacitor. According to the invention, N-hydroxypropyl acrylamide is used as a polymeric monomer, hydroxypropyl pachymaran is used as a reinforcing modifier, calcium chloride is used as an electrolyte, borax is used as a cross-linking agent, and a'redox-initiated polymerization-ultraviolet ozone surface modification-synchronous stretching coating assembly 'process is adopted to prepare the composite material. According to the invention, a synergistic effect is formed by copolymerization crosslinking and ultraviolet ozone surface modification, the mechanical property of a GPE body is guaranteed by copolymerization crosslinking, the interface adhesion force is synchronously improved by surface modification, the two parts are adapted in the whole process from network construction to interface optimization, and the mechanical strength and the adhesion property are synchronously improved in mechanism.

The invention relates to a temperature-sensitive-pH dual-response environment-friendly color fixing agent for hemp as well as a preparation method and application of the color fixing agent. The color fixing agent is prepared from the following raw materials: chitosan, N-isopropylacrylamide, a sodium hydroxide solution, ammonium persulfate, 2, 3-epoxypropyltrimethylammonium chloride, sodium chloroacetate, a dispersing agent and pure water. Chitosan is used as a base material, carboxymethyl, N-isopropylacrylamide chain segments and cationic quaternary ammonium salt groups are sequentially introduced through graft polymerization and chemical modification, a dispersing agent is compounded, and the color fixing agent is prepared and has the temperature and pH dual response characteristics, specifically, when the temperature is higher than the low critical solution temperature, the temperature-sensitive chain segments shrink, and dye is physically coated; under the acidic condition, the cationic group and the anionic dye generate electrostatic adsorption, the two mechanisms have a synergistic effect, the color fixing agent is applied to bast fiber to remarkably improve the color fixing effect, the raw materials of the color fixing agent are environment-friendly, and the preparation process is simple.

This invention discloses a low-temperature antifreeze and crack-resistant concrete and its preparation method, belonging to the field of concrete technology. The concrete comprises the following components: cementitious materials, sand, crushed stone, temperature-responsive modified bamboo aggregate, water-reducing agent, water, succinic anhydride, fucoidan, and rock wool fiber. The preparation method of the temperature-responsive modified bamboo aggregate is as follows: S1. N-isopropylacrylamide and dodecyl acrylate are dissolved in a solvent, and initiator one is added to carry out a polymerization reaction. After separation, a copolymer of N-isopropylacrylamide monomer is obtained; S2. The copolymer of N-isopropylacrylamide monomer is dissolved in a calcium citrate aqueous solution and stirred evenly to obtain a copolymer of N-isopropylacrylamide aqueous solution; S3. Bamboo aggregate, copolymer of N-isopropylacrylamide aqueous solution, crosslinking agent, and initiator two are mixed and reacted at 40-50℃ for 4-5 hours to obtain the final product. This invention improves the low-temperature crack resistance of concrete through the synergistic effect of succinic anhydride, fucoidan, temperature-responsive modified bamboo aggregate, and rock wool fiber.

This invention discloses a dual-network temperature-sensitive nanohydrogel for fire extinguishing and reignition prevention in lithium iron phosphate batteries, and its preparation method, relating to the field of battery fire prevention and extinguishing technology. The method includes: firstly, adding phytic acid solution to an ammonium polyphosphate suspension for reaction; then, centrifuging, washing, and vacuum drying the resulting reaction solution to obtain an ammonium polyphosphate-phytic acid polymer; next, adding N,N′-methylenebisacrylamide and azobisisobutyronitrile to an N-isopropylacrylamide solution, reacting the resulting mixture to form a transparent gel, and post-processing to obtain powdered polyN-isopropylacrylamide; adding nano-silica, the ammonium polyphosphate-phytic acid polymer, and polyN-isopropylacrylamide to a methylcellulose solution to obtain a mixed solution; finally, adding sodium polyacrylate and magnesium chloride hexahydrate, and stirring at room temperature to obtain the final product. The dual-network temperature-sensitive nanohydrogel prepared by this invention exhibits high thermal stability.

This invention provides a thermosensitive photothermal pollen adsorbent and its preparation method. The raw materials for preparing the adsorbent include: pollen, N-isopropylacrylamide, pyrrole, lithium chloride, N-isopropylacrylamide polymerization initiator I and pyrrole polymerization initiator II. The N-isopropylacrylamide is grafted onto the pollen surface through polymerization to form grafted pollen, and the pyrrole is loaded onto the grafted pollen surface through polymerization. The thermosensitive photothermal pollen adsorbent and its preparation method of this invention have the advantages of high adsorption, low-temperature regeneration performance at 40-50℃, good photothermal conversion ability, and economy.

The invention discloses the preparation of a flexible conductive high-temperature resistant hydrogel and its application in a flexible zinc-ion battery. The preparation method comprises the following steps: reacting graphene oxide, ammonium cerium nitrate and NIPAM monomer to obtain GO-g-PNIPAM; then reacting P(VDF-TrFE-CTFE), Zn(OTF)2 and GO-g-PNIPAM to obtain a P(VDF-TrFE-CTFE) / GO-g-PNIPAM flexible conductive high-temperature resistant hydrogel. In the invention, grafting graphene oxide with N-isopropylacrylamide (PNIPAM) can improve the structural stability of PNIPAM and enhance the mechanical properties of the hydrogel. At the same time, the added P(VDF-TrFE-CTFE) can improve the conductivity of the hydrogel. The prepared hydrogel has good mechanical properties and high-temperature resistance and can be used in the aspect of flexible zinc-ion batteries.

The application provides an internal curing material suitable for aeolian sand road base, a preparation method and application thereof, and belongs to the technical field of road engineering.The internal curing material suitable for aeolian sand road base comprises the following raw materials: 25%-28% of alpha-methacrylic acid; 12%-14% of gamma-polyglutamic acid; 5%-20% of N-isopropyl acrylamide; 2%-3% of carrageenan; 0.3%-0.5% of malt dextrin; 0.5%-0.8% of cellulose ether; 0.8%-1.0% of lauryl alcohol polyoxyethylene ether; 12%-16% of expanded perlite powder; 1%-1.5% of viscosity regulator; 10%-11% of oil phase material; and 29.4%-42.1% of auxiliary material.The internal curing material suitable for aeolian sand road base has a bonding effect, and has water absorption-water retention-water release performance, can increase the bonding force between the superabsorbent resin SAP and cement and aggregate, and solves the technical problem of poor viscosity of the internal curing material in the prior art.

The invention discloses an amine-terminated acrylamide polymer shale inhibitor and a preparation method thereof. Polymeric monomers of the inhibitor comprise an acrylamide monomer A, N, N-dimethylacrylamide, acryloyl morpholine and an amino thiol monomer. The acrylamide monomer A is selected from at least one of methacrylamide, isopropyl acrylamide and acrylamide; the amino thiol monomer is selected from at least one of cysteine and homocysteine. The synthesis process is simple and efficient, the cost is low, and the prepared polyamine inhibitor is high in shale hydration inhibition, stable in performance under the high-temperature condition and good in compatibility.

The invention provides anti-fog glass and a preparation method thereof. The anti-fog glass comprises a glass substrate, a bonding layer and an anti-fog layer, wherein the bonding layer is arranged between the anti-fog layer and the glass substrate; the coating of the anti-fog layer comprises the following components in parts by weight: 70-90 parts of a first monomer, 5-15 parts of a second monomer, 3-6 parts of a cross-linking agent and 5-10 parts of a photoinitiator; the first monomer comprises one or a combination of more than two of hydroxyethyl methylacrylate, polyethylene glycol diacrylate, N-hydroxymethyl acrylamide, methacrylamide, N-isopropylacrylamide and N, N-dimethylacrylamide; the second monomer is prepared from one or a combination of more than two of trifluoroethyl methacrylate, methyl methacrylate, butyl acrylate, ethylene glycol dimethacrylate, glycidyl methacrylate, benzyl methacrylate and 2-acrylic acid-2-hydroxy-3-phenoxy propyl ester. The anti-fog glass disclosed by the invention has the advantages of anti-fog property, moisture resistance, salt fog resistance and wear resistance.

This invention belongs to the field of cement production and processing technology, specifically relating to a grinding aid for cement processing and its preparation process. The invention utilizes vinyltrimethoxysilane, 2-hydroxyethyl acrylate, N-isopropylacrylamide, acrylic acid, and methyl allyl polyoxyethylene ether in a free radical polymerization reaction under the action of a redox initiator to prepare the grinding aid for cement processing. Through the synergistic effect of multiple functional groups, the adsorption capacity of the grinding aid to cement particles is improved, thereby enhancing the dispersibility of cement and achieving good grinding efficiency. Modified nano-alumina is added to the grinding aid for cement processing, utilizing its nano-sized particles as micro-balls to fill the gaps between cement particles, reducing particle collisions and friction, lowering grinding resistance, and improving grinding efficiency. Furthermore, during the subsequent hydration process of cement, it acts as a potential nucleus, promoting the formation and growth of C-S-H gel, and enhancing the strength of cement products.

The present invention relates to a hydrogel that can be used to prevent or treat endometriosis and as mechanical contraception. Said hydrogel comprises a crosslinked network of at leasta) a first monomer unit selected from the group consisting of acrylamide-2-methylpropanesulfonic acid (AMPS), acrylic acid, sodium acrylate, polyethylene glycol acrylate, (acrylamidopropyl)trimethylammonium chloride, methacrylic acid, 2-(dimethylamino)ethyl acrylate, 2-aminoethyl acrylate hydrochloride and 2-acryloxyethyltrimethylammonium chloride or a mixture thereof,b) a second monomer unit selected from the group consisting of N-2-hydroxyethyl acrylamide (NHEA), N-2-hydroxypropyl acrylamide (NHPA), acrylamide, N-isopropylacrylamide (NIPAm), hydroxyethyl methacrylate (HEMA), hydroxyethyl acrylate (HEA), methyl acrylate, butyl acrylate, ethyl hexyl acrylate, methacrylamide, and ethyl hexyl (meth)acrylate or a mixture thereof,c) at least one crosslinker with dual functionality, having at least two crosslinking groups and at least one degradable moiety selected from the group consisting of a photo-labile group, a disulfide bond and a diselenide bond.

The invention belongs to the technical field of epoxy resin emulsification, and particularly relates to a temperature response type emulsifier, a preparation method, application and epoxy resin emulsification equipment. The preparation method of the temperature response type emulsifier comprises the following steps: (1) mixing a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer with water, dissolving, and adjusting the pH value to obtain a pre-polymerized solution; (2) adding an N-isopropylacrylamide monomer and an initiator into the pre-polymerized solution under the protection of nitrogen, and heating for reaction to obtain a reaction solution; (3) adding a cross-linking agent into the reaction liquid for cross-linking modification to obtain a crude product; and (4) purifying the crude product obtained in the step (3) to obtain the temperature-responsive emulsifier. The temperature-responsive emulsifier provided by the invention is helpful for realizing regulation and control of the surface activity of the emulsifier, and breaks through the technical limitation of the traditional static emulsifier.

In an embodiment, the present disclosure pertains to a multi-network hydrogel composed of a first network, a second network, and a third network. In some embodiments, the first network, the second network, and the third network form a poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS) / A-isopropylacrylamide (NIPAAm) copolymerized with acrylamide (AAm) / poly((3-acylamidopropyl)trimethylammonium chloride) (PAMPS / P (NIPAAm-co-AAm) / PAPTAC) triple network hydrogel. In another embodiment, the present disclosure pertains to synthetic cartilage compositions composed of the multi-network hydrogels as disclosed herein. In a further embodiment, the present disclosure pertains to methods of forming the multi-network hydrogels of the present disclosure.

The invention discloses a temperature-sensitive regulation molybdenum disulfide composite nano material and application thereof in crop cold damage control, and belongs to the technical field of anti-cold agents. The preparation method comprises the following steps: mixing monomers (N-isopropylacrylamide and N-tert-butyl acrylamide), a cross-linking agent, a surfactant and a MoS2 dispersion liquid, and heating to react for a period of time; then adding an initiator, and continuously reacting for a period of time; and after the reaction is finished, cooling and dialyzing to obtain the temperature-sensitive regulation and control molybdenum disulfide composite nano material. The composite nano material is dispersed in water to prepare a suspension, and the suspension is applied to crops such as corn and soybean plants in a foliage spraying manner, so that the cold resistance of the crops is enhanced, and the biomass of the crops such as the corn and the soybean which are damaged by cold is improved. The method is simple and efficient, and has a good application prospect.

This invention relates to the field of interventional medicine, specifically a highly fluid temperature-sensitive polymer, an embolic material, and a method for preparing the same. The temperature-sensitive polymer is a copolymerized polymer using N-isopropylacrylamide (NIP) and N-n-propylacrylamide (NNP) as monomers in a weight percentage range of 75:25 to 50:50. The temperature-sensitive polymer has a degree of polymerization of 3.2 to 8.4 × 10⁻⁶. 4 Temperature-sensitive polymer-1 was used to prepare an embolic material with good flow properties using a solution of temperature-sensitive polymer and a developer. The prepared embolic material has the advantages of good flowability at room temperature, non-sticking to the tube, non-clogging, easy injection, and good operability.

The invention relates to a hydrogel dressing and a preparation method thereof. The hydrogel dressing comprises the following components in percentage by mass: 0.1-3% of a cross-linking agent; 5 to 30% of N-isopropylacrylamide (N-isopropylacrylamide); 5 to 30% of N-[tris (hydroxymethyl) methyl] acrylamide; 0.1 to 2% of boric acid polyaniline; and the balance of deionized water. The dosage of a cascade enzyme initiator is 10-200 U / mL, and the preparation method comprises the following steps: dispersing a cross-linking agent, N-isopropylacrylamide, N-[tris (hydroxymethyl) methyl] acrylamide and boric acid polyaniline in deionized water to form a hydrogel precursor solution, the mass fraction of the cross-linking agent, the mass fraction of the N-isopropylacrylamide, the mass fraction of the N-[tris (hydroxymethyl) methyl] acrylamide and the mass fraction of the boric acid polyaniline are 0.1%-3%, 5%-30%, 5%-30% and 0.1%-2% in sequence, and the balance is deionized water; a cascade enzyme initiator is added into the hydrogel precursor solution for polymerization, the hydrogel dressing is obtained, and the dosage of the cascade enzyme initiator is 10-200 U / mL. According to the hydrogel dressing and the preparation method, the hydrogel dressing has excellent adhesion performance, shrinkage performance, tension resistance and anti-inflammatory / antibacterial performance, has remarkable significance on rapid plugging and regeneration of penetrative fistula, is high in gel forming speed and low in cost, and can effectively improve the production efficiency and reduce the production cost.

The present invention discloses a natural plant-based antibacterial sanitary napkin surface material and a sanitary napkin, and relates to the field of fabrics. When preparing the natural plant-based antibacterial sanitary napkin surface material, the present invention first reacts bamboo pulp fiber pretreated with 3-chloropropyltriethoxysilane with benzimidazole-1-acetic acid, and then undergoes amidation and sodium hypobromite degradation to obtain modified bamboo pulp fiber; secondly, hemp fiber is grafted with an initiator to initiate polymerization of acrylamide and N-isopropylacrylamide to obtain modified hemp fiber; finally, the modified bamboo pulp fiber and the modified hemp fiber are subjected to cleaning, carding, web laying, hydroentanglement, degreasing, bleaching, and finishing with a finishing agent to obtain the natural plant-based antibacterial sanitary napkin surface material. The natural plant-based antibacterial sanitary napkin surface material prepared by the present invention has excellent antibacterial and anti-rewetting properties.

The invention discloses a silybin B molecular imprinting template as well as a preparation method and a use method thereof, and belongs to the technical field of molecular imprinting, and the preparation method comprises the following steps: adding silybin B, N-isopropylacrylamide, ethylene glycol dimethacrylate and polyvinylpyrrolidone into acetonitrile, uniformly dispersing, then adding azodiisobutyronitrile, and uniformly stirring to obtain the silybin B molecular imprinting template. The preparation method comprises the following steps: reacting under the protection of nitrogen, washing the reacted insoluble substance with a mixture of methanol and acetic acid, and drying to obtain polymer microspheres which are used as the silibinin B molecular imprinting template. Molecularly imprinted polymer microspheres are prepared through a free radical polymerization reaction, the formed microspheres are uniform in structure and not prone to agglomeration, the obtained polymer microspheres have the temperature-sensitive characteristic and can adsorb silybin B molecules at the room temperature, the polymer microspheres are subjected to phase transformation after being heated, the polymer structure shrinks, silybin B is released, and the silybin B can be effectively adsorbed. Silybin B molecules can be efficiently separated by utilizing selective adsorption and temperature-sensitive characteristic desorption of a molecular imprinting technology on the silybin B.

The invention provides anti-cracking concrete based on response type water sustained-release microcapsules and a preparation method of the anti-cracking concrete, and belongs to the technical field of concrete materials. The concrete comprises cement, aggregate, a mineral admixture, water, a water reducing agent and water slow-release microcapsules. The microcapsule takes hydroxypropyl methyl cellulose and chitosan as slow-release carriers, is grafted with a temperature-sensitive monomer N-isopropylacrylamide and a hydrophilic monomer methoxypolyethylene glycol, is coated with a silane coupling agent on the surface, has temperature-sensitive and salt-sensitive dual response characteristics, and can intelligently release water according to the temperature and ion concentration change in the hydration process. The concrete can effectively regulate and control the hydration process, reduce the shrinkage stress and delay the generation of cracks, and has a remarkable anti-cracking enhancing effect and good construction applicability.

This invention discloses a temperature-responsive hydrogel with a low critical solution temperature 37°C higher than physiological temperature. It is formed by the polymerization reaction of comonomers N-isopropylacrylamide, 1-pyrene methacrylate, and acrylic acid with a crosslinking agent initiated by a free radical initiator. This invention further provides an enzyme-carrying hydrogel prepared from the aforementioned temperature-responsive hydrogel and a carbon nanotube-enzyme-carrying hydrogel composite material. The carbon nanotube-enzyme-carrying hydrogel composite material of this invention is in a swollen state at physiological temperature, and its reversible swelling-contraction changes, regulated by near-infrared light, dynamically regulate the catalytic activity of biological enzymes. Furthermore, carbon nanotubes possess excellent conductivity, and changes in the microgel morphology promote electron transfer within the three-dimensional conductive framework of the composite material, thereby enhancing the electrochemical response. The carbon nanotube-enzyme-carrying hydrogel composite material of this invention can be used to construct intelligent sensors suitable for in vivo controlled analysis.

The invention discloses a solid thickening agent for fracturing and a preparation method thereof, and relates to the technical field of chemical treatment agents. The water-based adhesive is prepared from the following components in parts by weight: 30 to 35 parts of N-hydroxyethyl acrylamide, 18 to 24 parts of N-(3-methoxypropyl) acrylamide, 14 to 16 parts of vinyl sulfonate, 8 to 10 parts of vinyl benzoate, 6 to 8 parts of diacetone acrylamide, 4 to 6 parts of dimethyl itaconate, 2 to 4 parts of dodecyl benzene sulfonic acid isopropylamine salt, 120 to 140 parts of deionized water and 1 to 2 parts of azodiisobutylimidazoline hydrochloride. The materials are put into a blending tank to be uniformly mixed. According to the solid thickening agent for fracturing and the preparation method thereof, the shearing resistance, the temperature resistance, the salt resistance and the sand suspending property of the solid thickening agent are obviously superior to those of an existing thickening agent.