19 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.

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 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.

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 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.

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.

This invention belongs to the technical field of thermoelectric materials and functional polymer materials, specifically relating to a thermoelectric hydrogel based on the synergistic enhancement of zwitterionic and polar solvents, its method, and applications. The thermoelectric hydrogel is obtained by polymerizing a precursor solution to form a gel matrix, followed by immersion in an immersion solution to introduce a potassium ferrocyanide / potassium ferrocyanide redox couple. The precursor solution is prepared by mixing acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N,N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, the zwitterionic monomer [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide, the crosslinking agent N,N'-methylenebisacrylamide, a photoinitiator, and deionized water. This invention prepares a thermoelectric hydrogel with high mechanical strength, high ductility, and a high Seebeck coefficient, and also exhibits good temperature resistance.

The invention discloses a preparation method of a temperature-sensitive gel material and application of the temperature-sensitive gel material in recovery of phosphorus in electroplating wastewater, and belongs to the technical field of gel materials.The preparation method of the temperature-sensitive gel material comprises the following steps that S1, a precursor BA-Fe-MOF is subjected to ultrasonic dispersion in pure water, and dispersion liquid is obtained; s2, adding N-isopropylacrylamide and a cross-linking agent N, N '-methylene bisacrylamide into the dispersion liquid, and after the N-isopropylacrylamide and the cross-linking agent N, N'-methylene bisacrylamide are completely dissolved, filling inert gas into the solution to remove dissolved oxygen; s3, adding an initiator ammonium persulfate into the solution treated in S2, uniformly stirring, adding an accelerant N, N, N ', N'-tetramethylethylenediamine, stirring and mixing, and standing for polymerization to obtain gel; and S4, soaking and washing the gel, and freeze-drying to obtain the temperature-sensitive gel material. The thermo-sensitive gel material disclosed by the invention has good adsorption and removal capability on phosphorus in the electroplating wastewater, and can recycle non-renewable phosphorus while removing the electroplating wastewater.

The application discloses a kind of high-efficiency histidine-rich protein separation chromatography materials P (NIPAM-co-AAc)-PAMAM@Cu and preparation method thereof, belong to functional polymer chromatography material technical field;Its preparation method includes the following steps: with azobisdimethyl isobutyronitrile (AIBN) as initiator, N,N-methylene bisacrylamide (MBA) is used as crosslinking agent, N-isopropyl acrylamide (NIPAM) and acrylic acid (AAc) are used as monomer, polyamidoamine (PAMAM) is used as function group, prepare P (NIPAM-co-AAc)-PAMAM hydrogel, after chelation with copper nitrate, finally the chromatography material P (NIPAM-co-AAc)-PAMAM@Cu is prepared.The chromatography material prepared by the application, under certain conditions, the equilibrium adsorption capacity of BHb, BSA, Lyz is 646.23mg / g, 108.33mg / g and 56.24mg / g respectively, has the advantages of large adsorption capacity and high selectivity for histidine-rich protein;And the chromatography material has good separation performance and cyclic regeneration, provides a new way for the separation and purification of histidine-rich protein.

This invention provides a multifunctional seawater-resistant dressing and its preparation method. The dressing comprises, from bottom to top, a hemostatic and absorbent layer, an antibacterial layer, a waterproof self-adhesive layer, and a release layer. The hemostatic and absorbent layer is prepared from raw materials including a hemostatic agent, N-isopropylacrylamide, acrylic acid, and a crosslinking agent. The antibacterial layer is formed by electrospinning bismuth tungstate / silver bromide heterojunction nanoparticles and a polymer solution, with a material-to-liquid ratio of bismuth tungstate / silver bromide heterojunction nanoparticles to the polymer solution of 5:1 mg / mL. The dressing prepared by this invention effectively prevents seawater immersion and exhibits excellent hemostatic and antibacterial effects.

The application provides a polymer microsphere for profile control and flooding and a preparation method thereof. The preparation method comprises the following steps: preparing a first aqueous phase mixed solution by mixing acrylamide, N-isopropyl acrylamide and nanocellulose subjected to TEMPO oxidation modification; mixing an oil phase solvent and an emulsifier to obtain an oil phase solution; mixing a crosslinking agent, an initiator and the first aqueous phase mixed solution to obtain a second aqueous phase mixed solution; adding the second aqueous phase mixed solution into the oil phase solution, stirring at a first rotating speed for a first time, and then reacting under the condition of stirring at a second rotating speed for a second time to obtain a reacted emulsion system; and drying and forming the reacted emulsion system to obtain the polymer microsphere. The polymer microsphere for profile control and flooding is prepared by the preparation method. The polymer microsphere is a novel profile control agent, has good temperature resistance and salt resistance, has rigidity and flexibility, can enter the inside of an oil layer, and has good application in the field of profile control and water plugging.

The application discloses an antibacterial and antioxidative dynamic nanogel as well as a preparation method and application thereof. L-arginine is chemically modified by using methacrylic anhydride to obtain an antibacterial monomer M-Arg; M-Arg powder, N-isopropyl acrylamide, N,N'-methylene bisacrylamide, cetyltrimethylammonium bromide and 2,2'-azobis (2-amidinopropane) dihydrochloride are dissolved in deionized water to perform precipitation polymerization, dialysis, concentration and pH value adjustment, and thus an antibacterial nanogel is obtained; dopamine is grafted into the antibacterial nanogel through 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide activation, dialysis, concentration and pH value adjustment, and thus the antibacterial and antioxidative dynamic nanogel is obtained; the antibacterial and antioxidative dynamic nanogel can exert good antibacterial and antioxidative effects under different temperatures and different acidic environments, and can be used for the treatment of infected wounds.