266 results about "Methylene bisacrylamide" patented technology

The invention relates to the technical field of oilfield chemistry, and discloses a graft modified cellulose filtrate reducer and a preparation method thereof.The preparation method comprises the following steps that modified hydroxyethyl cellulose, 2-acrylamide-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, alkenylated cardanol and N, N '-methylene bisacrylamide are added into deionized water, stirring is conducted, and a mixture is obtained; the preparation method comprises the following steps: adding cellulose into a reaction kettle, stirring for 10-15 minutes at the temperature of 40-60 DEG C at the speed of 300-400 rpm, dropwise adding ammonium persulfate and sodium hydrogen sulfite into a system, and continuously reacting for 4-6 hours to obtain the grafted modified cellulose filtrate reducer. The filtrate reducer disclosed by the invention has good high temperature resistance and salt resistance.

The invention discloses a hydrogel patch for gastric perforation repair and a preparation method thereof, and belongs to the technical field of biomedical materials. The preparation method comprises the following steps: dissolving acryloyl valine, acrylic acid, methylene bisacrylamide, a compound A and a photoinitiator in an alcohol solvent, and defoaming to obtain a precursor solution; and placing the precursor solution in a mold, carrying out ultraviolet-induced curing, soaking the obtained hydrogel in a hydrochloric acid solution, and replacing the alcohol solvent to obtain the hydrogel patch for gastric perforation repair. The hydrogel patch provided by the invention has the advantages of strong acid corrosion resistance, good biocompatibility, low swelling ratio, stable adhesion performance in a fluctuating pH environment and the like. The tough and stable adhesion performance ensures that the hydrogel can be permanently and reliably adhered to a gastric perforation part in a dynamic gastric acid environment, and a stable platform is provided for drug delivery, so that the surgical operation time is expected to be shortened, and wound healing is promoted.

The invention relates to the technical field of functional polymer composite materials, and provides diatomite modified composite super absorbent and rapid absorbent resin and a preparation method thereof. The preparation raw materials of the diatomite modified composite high-water-absorption and rapid-water-absorption resin provided by the invention comprise acrylic acid, acrylamide, sodium hydroxide, N, N '-methylene bisacrylamide, ammonium persulfate and modified diatomite. The diatomite is modified by the silane coupling agent, the agglomeration problem of the diatomite is solved, the compatibility with organic monomers is improved, and the modified diatomite, acrylic acid and acrylamide are utilized to construct an organic-inorganic synergistic three-dimensional porous network structure, so that the resin has ultrahigh water absorption rate, rapid water absorption performance and good water retention stability. Meanwhile, the preparation method disclosed by the invention does not need nitrogen protection, has the advantages of simple process, controllable raw material cost and easiness in industrial mass production, and is suitable for multiple fields such as water-saving agriculture, soil moisturizing, landscaping and the like.

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 discloses high-strength deformable porous hydrogel for postoperative abdominal cavity tissue effusion drainage, belongs to the technical field of medical porous hydrogel, and particularly relates to a temperature-sensitive hydrogel reaction solution obtained by adding a monomer, a cross-linking agent and an initiator into water and mixing, and freezing and polymerizing to obtain ice gel; treating the ice gel in a salting-out solution to obtain porous hydrogel; the cross-linking agent is prepared from at least one of N, N-methylene bisacrylamide, N, N-methylene bisacrylamide and polyethylene glycol diacrylate. The invention provides the high-strength deformable porous hydrogel for postoperative abdominal cavity tissue effusion drainage, which has a temperature-sensitive effect, can be dynamically controlled through electric heating, and has good mechanical properties and a good drainage effect.

The invention discloses a core-shell structure P (MMA-MBA) copolymer heat-storage phase-change microcapsule, the microstructure is of a spherical structure, the core-shell structure is adopted, the core structure is hexadecane, the shell structure is a methyl methacrylate (MMA) and N, N-methylene bisacrylamide (MBA) copolymer, the emulsifier is lauryl sodium sulfate (SDS), the initiator is potassium persulfate, and the pH value of the core-shell structure P (MMA-MBA) copolymer heat-storage phase-change microcapsule is 7-8. And the coating efficiency is 70-75%. The preparation method comprises the following steps: 1, preparing an oil phase and a water phase; and 2, polymerization reaction of the microcapsule. A phase change cement material based on a core-shell structure P (MMA-MBA) copolymer heat storage phase change microcapsule is prepared by compounding the P (MMA-MBA) copolymer heat storage phase change microcapsule and a cement matrix, and has hydrophobicity; obvious weightlessness exists in two times.

The invention discloses a preparation method of an environment-friendly lithium battery fire extinguishing agent based on nanofiber gel, and relates to the technical field of fire extinguishing. When the environment-friendly lithium battery fire extinguishing agent is prepared, nano sodium carboxymethyl cellulose reacts with N-isopropylacrylamide and N, N-methylene bisacrylamide to prepare semi-interpenetrating network hydrogel; the semi-interpenetrating network hydrogel and calcium lactate are cross-linked, and nano sodium carboxymethyl cellulose hydrogel is prepared; and mixing and stirring the nano sodium carboxymethyl cellulose hydrogel, the modified silicon carbide and a flame retardant to prepare the environment-friendly lithium battery fire extinguishing agent. The prepared environment-friendly lithium battery fire extinguishing agent has good fire extinguishing performance.

The invention discloses thermal stimulation response hydrogel and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: dissolving acryloyl valine, acrylamide, methylene bisacrylamide and a photoinitiator in an organic solvent, and defoaming to obtain a precursor solution; and S2, putting the precursor solution into a mold, carrying out ultraviolet light-induced curing, soaking the obtained hydrogel in an acid solution, replacing the organic solvent, and then carrying out heat treatment to obtain the thermal stimulation response hydrogel. Compared with other existing thermal response type hydrogel, the thermal response type hydrogel has the advantages that the fracture stress, the modulus, the tensile work and the like are remarkably improved in the order of magnitude level, and excellent comprehensive mechanical properties are shown. The thermally-induced hardening hydrogel developed by the invention has a wide application prospect in the field of engineering devices requiring higher modulus and requiring significant change of mechanical properties before and after heating.

The invention relates to the technical field of blood purification materials, in particular to a zirconium-titanium bimetal MOF hollow microsphere adsorbent and a preparation method and application thereof. The adsorbent is based on a Zr / Ti bimetallic node and a phosphonic acid-carboxylic acid mixed ligand, a composite MOF hollow microsphere structure with high stability and high specific surface area is constructed through a solvothermal and polymerization synergistic reaction in a water-in-oil suspension system, a phosphonic acid group and Zr are strongly coordinated to improve the stability of a framework, and the composite MOF hollow microsphere structure has a high specific surface area. The carboxylic acid group keeps the hydrophilicity of the pore channel; meanwhile, a cross-linked network of acrylamide and N, N '-methylene bisacrylamide penetrates through crystal gaps in the balling process, so that the material has excellent mechanical strength and fluid stability; and a sulphobetaine amphoteric polymer brush layer is constructed on the surface of the MOF through endogenous initiation point modification and surface in-situ controllable free radical polymerization technologies, so that protein adsorption and platelet adhesion are effectively inhibited, the blood compatibility is remarkably improved, and meanwhile, the channel accessibility is maintained to promote rapid diffusion and adsorption of bilirubin.

The invention discloses a flexible self-powered triboelectric sensor, and belongs to the technical field of sensors, the flexible self-powered triboelectric sensor comprises a first silicone rubber layer, a hydrogel layer, a conductive silica gel electrode layer and a second silicone rubber layer which are sequentially arranged from top to bottom, the hydrogel layer is prepared from N-isopropylacrylamide (NIPAM), N, N-dimethylacrylamide (DMAA), N, N-dimethylacrylamide (DMAA), N, N-dimethylacrylamide (DMAA) and N, N-dimethylacrylamide (DMAA); n, N '-methylene bisacrylamide (MBA) and sodium alginate (SA) are copolymerized to form a three-dimensional network, in-situ embedding of biological source orange juice carbon dots is initiated through ultraviolet light, and the first silicone rubber layer, the hydrogel layer, the conductive silica gel electrode layer and the second silicone rubber layer are bonded and fixed on the periphery through silica gel. The invention discloses a green, safe and high-performance flexible triboelectric sensor, which realizes excellent electrical output through a simple process and is combined with an advanced signal processing technology to realize accurate recognition of multiple key physiological signals by a single sensor.

The invention discloses zwitterionic concrete internal curing hydrogel based on humidity-pH dual responsiveness and a preparation method of the zwitterionic concrete internal curing hydrogel, and belongs to the technical field of building materials. The water-based cleaning agent is prepared from the following raw material components in percentage by weight: 6%-8% of N-vinyl imidazole, 8%-12% of 2-methylimidazole, 6%-8% of 2-acrylamido-2-methylpropanesulfonic acid, 2%-4% of sodium p-styrenesulfonate, 26%-30% of acrylic acid, 18%-21% of N-vinyl pyrrolidone, 15%-18% of glycidyl methacrylate, 2%-5% of nano montmorillonite powder, 0.05%-0.1% of divinyl benzene, 0.05%-0.15% of N, N-dimethylformamide and the balance of water. The invention discloses an anti-freezing agent which is prepared from the following components in percentage by weight: 0.1%-0.3% of N, N-methylene bisacrylamide, 0.1%-0.3% of 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propane-1-ketone, 0.5%-0.8% of ammonium persulfate and 0.5%-0.8% of sodium hydrogen sulfite. Double response to the internal humidity and pH value of the concrete can be achieved, and the requirement for precise internal curing of modern high-performance concrete is met.

The invention provides an interface-stable and anti-fatigue Janus conductive hydrogel, a preparation method and sensing application, and the preparation method comprises the following steps: uniformly mixing acrylic acid, ethylene glycol dimethacrylate, a photoinitiator, ferric chloride hexahydrate and deionized water to obtain a support layer precursor solution; mixing acrylic acid, lauryl methacrylate, N, N '-methylene bisacrylamide and the nanocellulose suspension, performing ultrasonic treatment to obtain a Pickering emulsion, adding a photoinitiator into the Pickering emulsion, and uniformly mixing to obtain an adhesion layer precursor solution; and pouring the support layer precursor solution into a mold, then slowly pouring the adhesion layer precursor solution onto the support layer precursor solution, carrying out ultraviolet curing, taking out from the mold, and cleaning to obtain the Janus conductive hydrogel. According to the method, the Pickering emulsion phase separation and the charge shielding effect are combined through a simple and convenient one-step method, and the problems that a traditional multi-layer assembly process is complex in operation and unstable in interface are effectively solved.

A geopolymer precursor includes an alkaline reactive solid material containing aluminum, silicon, and oxygen, and a fluid loss control material having an ionic stability property that has a first value in water and a second value in a 3M solution of NaOH, wherein a ratio of the second value to the first value is in a range of 0.5 to 2.0. The fluid loss control material may be, or may include a crosslinked polymer, which may include a reaction product of one or more of acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, N,N‑dimethylacrylamide, N,N‑diethylacrylamide, vinyl acetate, or another monomer, and a crosslinker including one or more of methylene bisacrylamide, triallyl amine, pentaerythritol allyl ether, triallyl-triazine-trione, or another material. The geopolymer precursor may include an activator, an alkaline solution having pH of at least about 9, or both.

The present disclosure provides a preparation method of a porous hydrogel adsorbent based on Radix astragali residues, including the following steps: subjecting residues of Chinese herbal medicine Radix astragali as a precursor to bleaching with NaClO2, alkaline washing with KOH, and high power ultrasonic treatment, thereby obtaining a precursor solution of uniformly dispersed cellulose nanofibers (CNFs); adding the precursor solution of CNFs to a mixed solution of N,N′-methylene bisacrylamide (MBA), acrylic acid (AA) and ammonium persulfate (APS), shaking evenly, and initiating a polymerization reaction at a predetermined temperature to form a monolithic gel; and cleaning the monolithic gel, putting the cleaned monolithic gel into a dimethyl sulfoxide (DMSO) solution containing epichlorohydrin to allow reaction, and transferring the product of the reaction to an aqueous sodium hydroxide solution containing triethylene tetramine to allow reaction, thereby finally obtaining an amino-functionalized porous hydrogel adsorbent.

The invention discloses a high-temperature-resistant and high-modulus adhesive and a preparation method thereof, and relates to the technical field of adhesives. The water-based adhesive comprises the following raw materials: 40-60 parts of a soft monomer, 20-30 parts of a hard monomer, 5-10 parts of a functional monomer, 1-3 parts of a cross-linking agent, 0.5-1.5 parts of an initiator, 2-5 parts of a modified nano filler and 30-50 parts of a solvent, the functional monomer is prepared by compounding N-methoxy methyl acrylamide, acrylic acid and 2-acrylic acid-hexahydro-4, 7-methylene-1H-indenyl ester according to a mass ratio of 2 to 1 to (1 to 1.5); the cross-linking agent is prepared by compounding N, N '-methylene bisacrylamide and 1, 1, 3, 3-tetramethyl-1, 3-divinyl disilazane according to a mass ratio of 1: (0.5 to 1). The adhesive has the advantages of favorable adhesive property, favorable high-temperature resistance and high modulus.

The application belongs to the technical field of dental antibacterial materials, and discloses a kind of nanometer composite antibacterial coating for dental material and preparation method thereof.Method: monomer modified arginine, monomer N-isopropyl acrylamide, monomer methyl hexyl acrylate, initiator azobisdimethylamino propanamide hydrochloride, dispersing agent cetyltrimethylammonium bromide and crosslinking agent N,N-methylene bis(acrylamide) are dissolved in water, and the reaction is carried out under protective atmosphere, dialysis, to obtain nanogel dispersion;The nanogel dispersion is mixed with the nanometer zinc oxide dispersion to obtain a nanogel composite zinc oxide antibacterial coating, and a coating is formed after coating.The nanometer composite antibacterial coating for dental material has excellent retention capacity and antibacterial performance.

The invention discloses an anti-swelling cellulose-based supramolecular ion hydrogel sensing material as well as a preparation method and application thereof. The method comprises the following steps: esterifying hydroxypropyl methyl cellulose in ethyl acetate by using acryloyl chloride to obtain hydroxypropyl methyl cellulose acrylate; the preparation method comprises the following steps: dissolving 1-vinyl imidazole and 3-bromopropionic acid in N, N-dimethylformamide to prepare an imidazole ionic liquid; the preparation method comprises the following steps: dissolving hydroxypropyl methyl cellulose acrylate in deionized water, adding imidazole ionic liquid, acrylic acid, N, N-methylene bisacrylamide and ammonium persulfate, and reacting to obtain the anti-swelling cellulose-based supramolecular ionized water gel sensing material. The anti-swelling cellulose-based supramolecular ion hydrogel sensing material prepared by a free radical copolymerization strategy has the characteristics of good strength, flexibility, swelling resistance, freezing resistance, antibacterial property, biocompatibility, high conductivity, high sensitivity and strong environmental adaptability.

The application relates to preparation of indoor potted solid water and belongs to the field of solid water preparation. A preparation method is as follows: nitrogen is introduced into a four-necked flask for 10 min to remove air, wheat bran and wheat B starch wastewater are added, heating and stirring are carried out, sodium alginate and gellan gum are added to prepare A liquid; acrylic acid is neutralized by adding 25% NaOH solution under the condition of an ice water bath, after the neutralized liquid is cooled to room temperature, 2-acrylamide-2-methylpropanesulfonic acid, bentonite, methylene bisacrylamide and potassium persulfate are added to prepare B liquid; B liquid is slowly added into A liquid, heating and stirring are carried out to perform polymerization reaction, after the reaction is completed, filtration is carried out, anhydrous ethanol and distilled water are used for washing, and indoor potted special solid water is obtained. The indoor potted solid water provided by the application can provide convenience for office workers to maintain potted plants, can improve soil permeability and water absorption and water retention capacity, has a long use period, and is prepared by using natural degradable materials and has low cost.

The invention relates to the technical field of lithium ion battery key materials, in particular to a cross-linked polyacrylic acid / polyvinyl alcohol composite binder and a preparation method and application thereof. The binder is prepared by introducing N, N-dimethylformamide into a water-soluble acrylic monomer, an ethylenically-bond-containing acrylonitrile monomer and a vinyl ester monomer through ternary polymerization; n, N-methylene bisacrylamide (MBA) forms a rigid-flexible three-dimensional chemical cross-linked network, and then the rigid-flexible three-dimensional chemical cross-linked network and polyvinyl alcohol (PVA) construct an interpenetrating network (IPN) through hydrogen-bond interaction. The dual cross-linked network has the structural stability of chemical cross-linking and the dynamic adaptability of physical cross-linking, when the charging and discharging volume of the silicon-based negative electrode changes, stress is dissipated through network elastic deformation, meanwhile, interface bonding is strengthened through the ionic bond action of a lithium carboxylate group, active substance falling and electrode pulverization are inhibited, and the service life of the silicon-based negative electrode is prolonged. And the cycle life of the high-energy-density lithium ion battery is remarkably prolonged.

The invention relates to polyvinyl alcohol polynitrogen isoacrylamide cellulose hydrogel with an anisotropic structure as well as a preparation method and application of the polyvinyl alcohol polynitrogen isoacrylamide cellulose hydrogel, and belongs to the technical field of water catching materials. The preparation method of the hydrogel comprises the following steps: S1, adding polyvinyl alcohol, glutaraldehyde and lithium chloride into deionized water to obtain a mixed solution A; s2, adding the cellulose nanocrystal powder into deionized water to obtain a cellulose nanocrystal dispersion liquid; s3, adding N-isoacrylamide and N, N-methylene bisacrylamide into deionized water, so as to obtain a mixed solution B; s4, adding the mixed solution A and the cellulose nanocrystal dispersion solution into the mixed solution B, and reacting to obtain a mixed solution C; s5, ammonium persulfate, hydrochloric acid and tetramethylethylenediamine are added into the mixed solution C, freezing, low-temperature crosslinking and unfreezing are conducted, and then freezing-unfreezing circulation crosslinking is conducted; and finally, taking out, unfreezing and dialyzing. The hydrogel provided by the invention has a highly anisotropic structure and regular vertical pore channels.

The application belongs to the technical field of preparation of thermochromic hydrogel, and discloses a thermochromic hydrogel for shielding ultraviolet and near-infrared light and a preparation method and application thereof. The thermochromic hydrogel is prepared by one-pot low-temperature crosslinking with N-isopropyl acrylamide as a temperature-sensitive matrix, hydroxypropyl methyl cellulose as a modified component, titanium dioxide and cesium tungsten bronze as functional fillers, N, N-methylene bisacrylamide as a crosslinking agent, ammonium persulfate and sodium bisulfite as an initiation system. The thermochromic hydrogel realizes full-band regulation of sunlight by using the ultraviolet shielding of titanium dioxide and the near-infrared heat insulation performance of cesium tungsten bronze. The prepared hydrogel has the characteristics of high visible light transmittance, excellent solar light modulation efficiency and suitable critical transition temperature, and makes up for the defect of insufficient spectral shielding capacity of traditional single PNIPAM hydrogel. The process is mild and simple, the raw materials are cheap and easy to obtain, and the hydrogel is easy to form a film in a large area and to be prepared on a large scale, so the hydrogel can be widely applied to the fields of energy-saving and light-regulating such as intelligent windows of buildings, vehicle-mounted light-regulating glass and the like.

The invention belongs to the technical field of intelligent soft materials, and particularly relates to a cold atmospheric pressure plasma modified electromagnetic interference shielding hydrogel material, which is prepared from the following raw materials: 0.2 g of chitosan, 3 g of acrylic acid, 0.5 g of dimethylaminoethyl methacrylate, 2.5 mg of N, N '-methylene bisacrylamide, 100 [mu] L of 0.4 Mol / L 2, 2'-azobis (2-methylpropanamidine) dihydrochloride, and 2 mL of Ti3C2 MXene dispersion liquid. The preparation method comprises the following steps: mixing chitosan, acrylic acid and other raw materials, carrying out ice-water bath ultrasonic dispersion, introducing cold atmospheric pressure plasma (CAP) to modify MXene, and carrying out thermal polymerization to form hydrogel; according to the invention, the bonding force between the MXene and the substrate is enhanced, high mechanical property and terahertz wave band high shielding effectiveness are realized, the process is simplified, the use amount of the MXene is reduced, and the requirements of flexible electronics and wearable equipment are met.

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 application discloses a kind of highland alpine region concrete anti-cracking admixture and its preparation method and application, it is related to concrete admixture technical field.The components of the highland alpine region concrete anti-cracking admixture include: self-healing material 60~80 parts, slow-release curing agent 10~20 parts, low-temperature reinforcing agent 6~10 parts and workability regulator 4~10 parts by mass fraction;Raw materials of the self-healing material include: healing component, complex component, expansion component, aluminum potassium sulfate dodecahydrate and calcium hydroxide;Raw materials of the slow-release curing agent include: acrylic acid, acrylamide, N,N'-methylene bisacrylamide, ammonium persulfate and surface modifier solution.The highland alpine region concrete anti-cracking admixture is suitable for highland alpine region thin-walled high pier concrete, can reduce early shrinkage crack of thin-walled high pier concrete formed in highland alpine region harsh environment, improve its frost resistance.Meanwhile, it can also improve its mechanical properties, and will not affect its workability.

The invention belongs to the technical field of functional three-dimensional composite material preparation, and particularly relates to ion-modified carrageenan-polyacrylamide composite hydrogel and a preparation method thereof.The preparation method comprises the following steps that S1, carrageenan, acrylamide and N, N-dimethylformamide are mixed and stirred to be uniform, and a mixture is obtained; the preparation method comprises the following steps: dispersing and dissolving carrageenan, polyacrylamide, N, N '-methylene bisacrylamide and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methyl propiophenone in deionized water, and heating and stirring until solids are completely dissolved to obtain a carrageenan-polyacrylamide hydrogel prepolymer solution, namely a CA-PAM hydrogel prepolymer solution; s2, transferring the CA-PAM hydrogel pre-polymerized liquid into a watch glass, and refrigerating the CA-PAM hydrogel pre-polymerized liquid in an environment of 4 DEG C until the CA-PAM hydrogel pre-polymerized liquid is solidified to obtain a condensate; s3, irradiating the cured product by using an ultraviolet lamp, so as to prepare carrageenan-polyacrylamide composite hydrogel; s4, the carrageenan-polyacrylamide composite hydrogel is soaked in chlorate solutions with different concentrations respectively, and the ion modified / carrageenan-polyacrylamide composite hydrogel material is prepared.

The invention relates to stimuli-responsive hydrogel for repairing tissue damage and a preparation method of the stimuli-responsive hydrogel, and the hydrogel is prepared from the following components in parts by weight: 6 to 8 parts of modified isocyano ethyl methacrylate, 2 to 4 parts of modified chitosan, 0.2 to 0.3 part of N, N '-methylene bisacrylamide, 0.1 to 0.2 part of ammonium persulfate and 3 to 5 parts of deionized water. The preparation method comprises the following steps: dissolving modified isocyano ethyl methacrylate and modified chitosan in deionized water, uniformly stirring to prepare a solution, adding N, N '-methylenebisacrylamide and ammonium persulfate, uniformly stirring by using a magnetic stirrer, transferring the mixed solution into a closed reaction container, introducing nitrogen for 10-15 minutes, putting the reaction container into a water bath at 60-80 DEG C, reacting for 30-60 minutes, filtering, washing, and drying to obtain the modified chitosan / isocyanatoethyl methacrylate copolymer. The stimuli-responsive hydrogel for tissue damage repair is obtained. The hydrogel disclosed by the invention has a multi-stimulation response controlled release mechanism and good dynamic network self-healing performance.

The invention belongs to the technical field of composite materials, and particularly relates to liquid metal-polyacrylamide composite hydrogel, a preparation method thereof and a flexible sensor, and the preparation method comprises the following steps: S11, adding blocky EGaIn into absolute ethyl alcohol, performing ultrasonic treatment to obtain EGaIn particles, standing, putting the EGaIn particles into a vacuum drying oven, drying, and sealing for later use after the ethyl alcohol is completely volatilized; s12, dispersing and dissolving acrylamide and N, N '-methylene bisacrylamide in deionized water, stirring until solids are completely dissolved, and then adding the EGaIn particles as an initiator to obtain an EGaIn-PAM hydrogel prepolymer solution; and S13, carrying out ultrasonic treatment on the EGaIn-PAM hydrogel prepolymerization liquid under an ice-water bath condition, so that the polymer is converted into gel, and the EGaIn-PAM composite hydrogel is formed.

The invention relates to a polynitrogen isoacrylamide graphene oxide cellulose hydrogel with an anisotropic structure as well as a preparation method and application of the polynitrogen isoacrylamide graphene oxide cellulose hydrogel, and belongs to the technical field of water treatment. The preparation method of the hydrogel comprises the following steps: S1, adding graphene oxide into deionized water to obtain a graphene oxide dispersion liquid; s2, adding the cellulose nanocrystal powder into deionized water to obtain a cellulose nanocrystal dispersion liquid; s3, nitrogen isoacrylamide and nitrogen nitrogen methylene bisacrylamide are added into deionized water, and a mixed solution is obtained; s4, adding a graphene oxide dispersion liquid and a cellulose nanocrystal dispersion liquid into the mixed liquid, and reacting to obtain a nanocrystal solution; s5, a catalyst and tetramethylethylenediamine are added into the nanocrystalline solution, freezing, low-temperature crosslinking and unfreezing are conducted, and then freezing-unfreezing circulation crosslinking is conducted; and finally, taking out, unfreezing and dialyzing. The hydrogel provided by the invention has excellent solar photo-thermal water evaporation performance.

The invention relates to the technical field of medical abdominal pads, and discloses an anti-leakage multi-layer composite medical abdominal pad which comprises a top coating layer, a bottom anti-leakage layer and a liquid absorption core body arranged between the top coating layer and the bottom anti-leakage layer. The anti-leakage composite absorption resin is prepared by polymerizing and treating the following raw materials in parts by weight: 100 parts of acrylic acid which is neutralized by sodium hydroxide until the neutralization degree is 70-75 mol percent; 5.0 to 8.0 parts of an attapulgite powder body; 1.0 to 1.5 parts of citric acid; 0.01 to 0.05 part of p-methoxyphenol; 0.1 to 0.3 part of N, N '-methylene bisacrylamide; 0.1 to 0.15 part of ammonium persulfate; sodium hydrogen sulfite; and a surface crosslinking system. By constructing an inorganic framework and a cross-linked shell, the gel strength of the resin is improved, and the problem of reverse osmosis of the abdominal pad under pressure is solved; and in cooperation with core body compaction and hot melting edge sealing processes, lateral leakage of internal body fluid is blocked.

The invention belongs to the technical field of composite materials, and particularly relates to controllable silver nanomaterial modified-liquid metal-polyacrylamide composite hydrogel, a preparation method thereof and a flexible sensor, and the preparation method comprises the following steps: S11, adding blocky EGaIn into absolute ethyl alcohol, performing ultrasonic treatment to obtain EGaIn particles, standing, and drying in a vacuum drying oven to obtain the controllable silver nanomaterial modified-liquid metal-polyacrylamide composite hydrogel. Sealing for later use after the ethanol is completely volatilized; s12, dispersing and dissolving acrylamide and N, N '-methylene bisacrylamide in deionized water, stirring until solids are completely dissolved, and then adding the EGaIn particles as an initiator to obtain an EGaIn-PAM hydrogel prepolymer solution; s13, carrying out ultrasonic treatment on the EGaIn-PAM hydrogel prepolymerization liquid under an ice-water bath condition, so that a polymer is converted into gel, and EGaIn-PAM composite hydrogel is formed; s14, the EGaIn-PAM composite hydrogel is subjected to freeze drying, then the EGaIn-PAM composite hydrogel is soaked in an AgNO3 solution, the hydrogel is placed under a xenon lamp for illumination, and finally Ag / EGaIn-PAM hydrogel is obtained; wherein the concentration of the AgNO3 solution in the step S14 ranges from 0.02 M to 0.4 M.