129 results about "Tetramethylethylenediamine" patented technology

The invention provides a gel composite adsorbent with a foaming structure as well as a preparation method and application thereof, and the preparation method comprises the following steps: S1, dissolving acrylamide powder in deionized water, and stirring to obtain a solution A; s2, dissolving sodium alginate in the solution A for thickening to obtain a solution B; s3, transferring the solution B into an ice-water bath; s4, adding N, N-methylene bisacrylamide into the solution B, stirring until the N, N-methylene bisacrylamide is completely dissolved, then adding N, N, N ', N'-tetramethylethylenediamine, and stirring until the N, N, N ', N'-tetramethylethylenediamine is uniform to obtain a solution C; s5, adding ammonium persulfate into the solution C, and stirring until the ammonium persulfate is completely dissolved to obtain a solution D; s6, the solution D is poured into a mold and then vacuumized to form gel, and a hydrogel sample is obtained after gel forming; s7, drying the hydrogel sample, and then soaking the dried hydrogel sample in a salt solution to obtain a soaked gel material; and S8, drying the soaked gel material to obtain the finished product composite adsorbent.

The invention discloses a self-adaptive hydrogel coupling agent as well as a preparation method and application thereof, belongs to the field of medical instruments, and particularly relates to a preparation method of the self-adaptive hydrogel coupling agent. The preparation method comprises the following steps: dissolving a main monomer, a functional monomer, a molecular weight regulator and a reinforcing filler in sterilized deionized water under dark and sterile conditions, carrying out a free radical polymerization reaction under the action of a persulfate solution and tetramethylethylenediamine, and carrying out dialysis and sterilization treatment to obtain the self-adaptive hydrogel coupling agent. The self-adaptive hydrogel coupling agent prepared by the invention eliminates tissue deformation caused by probe pressurization, significantly improves the accuracy of measurement of the actual distance of a target by ultrasound in an operation, and meanwhile, the self-adaptive hydrogel coupling agent is good in biocompatibility, can be sterile, is convenient to operate, and is suitable for open or endoscopic surgical wounds.

The invention provides a preparation method of an insecticide synergistic responsive release delivery system, and belongs to the technical field of insecticides. Chlorantraniliprole insecticide is dissolved in an acetone solvent containing Tween 80 to form a drug-carrier complex; then polymerizing the N-isopropylacrylamide temperature-sensitive monomer under the action of an ammonium persulfate and tetramethylethylenediamine initiation system to form a temperature-responsive hydrogel matrix; four key parameters including the optimal molar ratio, the optimal embedding temperature, the optimal embedding time and the optimal phase change temperature control precision of an amido hydrophilic group and an isopropyl hydrophobic group are calculated by applying a double-layer game model, and a drug-carrier complex is embedded into a hydrogel matrix through a physical embedding effect to construct a three-layer nested delivery structure; the technical problem that the pesticide effect utilization rate is low due to the fact that the pesticide lacks an accurate temperature-responsive release control mechanism in environmental application is solved.

The invention relates to the technical field of gel material preparation, in particular to a bio-based gel material for dangerous chemical leakage disposal and a preparation method thereof.The preparation method comprises the steps that gelatin and deionized water are added into a reaction container, a gelatin solution is obtained under the preset dissolution condition, alkaline protease is added into the gelatin solution for an enzymolysis reaction, and a gelatin solution is obtained; a modified gelatin solution is obtained; the preparation method comprises the following steps: adding a phytic acid-chitosan compound and magnesium-aluminum layered double hydroxide into dispersion equipment, and obtaining a composite inorganic matter dispersion liquid under a preset dispersion condition; adding the modified gelatin solution, the composite inorganic substance dispersion liquid, polyethylene glycol and phase change microcapsules into a mixing reactor, and obtaining a premixed solution under a preset mixing condition; sequentially adding an initiator, a cross-linking agent and tetramethylethylenediamine into the premixed liquid, and performing cross-linking reaction under preset cross-linking conditions to obtain a bio-based gel initial product. The plugging efficiency of the bio-based gel material on dangerous chemical leakage is improved.

The invention relates to the technical field of oilfield chemistry, in particular to a clay stabilizer containing dihydroxyl quaternary ammonium salt and a preparation method thereof, and the preparation method of the clay stabilizer containing dihydroxyl quaternary ammonium salt comprises the following steps: mixing required amounts of tetramethylethylenediamine, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and a hydrogen bond donor for reaction to obtain the clay stabilizer containing dihydroxyl quaternary ammonium salt. And after the reaction is ended, obtaining the clay stabilizer containing the dihydroxyl quaternary ammonium salt. The clay stabilizer containing dihydroxyl quaternary ammonium salt is high in charge density and remarkable in clay expansion prevention effect; the fabric has the characteristic of multi-point adsorption and is high in washing resistance; the polymer is composed of small molecular weight compounds and can be used for transformation of low-permeability and ultra-low-permeability reservoirs. And meanwhile, the fracturing fluid has good compatibility with the fracturing fluid, the influence on the viscosity of the fracturing fluid is small, and the sand-carrying performance of the fracturing fluid can be guaranteed while reservoir protection is realized. The preparation method of the clay stabilizer containing the dihydroxyl quaternary ammonium salt is simple in process, easy to control and implement and suitable for industrial large-scale production.

The invention belongs to the technical field of underground engineering grouting materials, and discloses an anti-dispersion solid waste grouting filling material and a preparation method and application thereof. The slurry A is prepared from the following components in parts by mass: 400 to 1000 parts of fly ash, 500 to 1000 parts of blast furnace slag, 100 to 500 parts of Portland cement, 250 to 1200 parts of water, 5 to 50 parts of sodium hydroxide and 10 to 50 parts of PolyFure-I; the polyFure-I comprises acrylamide and N, N, N ', N'-tetramethylethylenediamine, and the polyFure-I comprises acrylamide and N, N, N ', N'-tetramethylethylenediamine; the slurry B is prepared from the following components in parts by mass: water glass and PolyFure-II; the PolyFure-II is prepared from water glass, an ammonium persulfate solution, xanthan gum and carboxymethyl cellulose. The flowing water dispersion resistance of the grouting material is effectively improved, the blocking effect of flowing water is enhanced, and the problem of insufficient blocking of a traditional grouting material is solved.

The invention provides a preparation method of a cyano chlorosilane compound, and the preparation method of the cyano chlorosilane compound comprises the following steps: reacting methyl dichlorosilane with a cyano-containing olefin compound under the action of a catalyst to obtain the cyano chlorosilane compound, the catalyst comprises a combination of cuprous salt, organic alkali and tetramethylethylenediamine. According to the method, methyl dichlorosilane and cyano-containing olefin are used as raw materials to react, and the cyano chlorosilane compound is prepared under the action of a specific catalyst; the preparation method is simple in reaction operation, the yield is 76% or above, the purity is 99.1% or above, and the preparation method is suitable for industrial production.

The invention discloses double-crosslinking personalized hydrogel for promoting wound healing and a preparation process thereof, and relates to the technical field of biomedical materials. The hydrogel comprises sodium alginate, modified chitosan, calcium carbonate, glucolactone, acrylamide, methylene diacrylamide, ammonium persulfate and tetramethylethylenediamine, and the hydrogel can also carry drugs in the preparation process, including but not limited to drugs with the functions of diminishing inflammation, resisting bacteria, stopping bleeding and the like. The hydrogel is prepared in a double-crosslinking mode of physical crosslinking and chemical crosslinking. The hydrogel provided by the invention has the advantages of high biocompatibility, adjustable viscosity, easy replacement, adjustable water absorbability and temperature responsiveness, has a loose porous structure, has better water content, cell proliferation and migration performance, swelling performance, drug sustained release performance and the like, can effectively promote wound healing, and has a good application prospect. The method has potential application prospects in skin wound treatment and repair.

The present invention discloses a preparation method of chrome-free tanned upper leather, comprising the following steps: Step 1: Re-wetting Add the prepared aqueous solution of sodium chloride and sodium bicarbonate into a drum machine, and then put in the raw hide, and rotate for 10 - 30 min; Step 2: Water washing Immerse the re-wetted raw hide in pure water and wash for 10 - 30 min; Step 3: Tanning Add water, a catalyst, and a modified tanning agent into the drum machine, and run the drum machine for tanning for 200 - 360 min; Step 4: Alkali raising Add sodium bicarbonate into the drum machine, adjust the pH to 8.0, raise the temperature to 35 °C, rotate for 4 h, stand for 5 - 20 h, and dry to obtain the upper leather; The modified tanning agent is formed by the reaction of starch, trimethylolethane triglycidyl ether, tetramethylethylenediamine, N-(2-hydroxyethyl)guanidine, and epoxypropionic acid. The purpose of the present invention is to provide a preparation method of chrome-free tanned upper leather.

This invention relates to a method for preparing a broadband absorption hydrogel. The method comprises the following steps: S1, mixing solvent A (N,N-dimethylformamide or acetonitrile) with deionized water to obtain a mixed solvent; S2, adding polyethylene glycol methyl ether acrylate-480 and acryloylmorpholine to the solvent in S1 and dissolving them to obtain a mixed solution; S3, removing dissolved oxygen from the mixed solution in S2, sealing the container, and stirring under ice bath conditions; S4, adding potassium persulfate and N,N,N',N'-tetramethylethylenediamine to the mixed solution after stirring in S3, and sealing the container again; S5, completing the polymerization reaction in the container at 60 °C to obtain the hydrogel. Compared with the prior art, the hydrogel material provided by this invention has improved reflection loss intensity and effective absorption bandwidth performance, thus providing a new perspective for developing highly flexible and efficient electromagnetic wave absorbers.

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 invention belongs to the field of intelligent materials, and discloses nanofiber-based shape memory aerogel as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: adding 4, 4-diaminodiphenyl ether and 1, 2, 4, 5-pyromellitic dianhydride into N, N-dimethylformamide to prepare a polyamide acid solution; carrying out electrostatic spinning by taking the polyamide acid solution as a spinning solution to obtain a polyamide acid nanofiber membrane; cutting the polyamide acid nanofiber membrane into fibers with micron lengths, and carrying out amidation treatment to obtain polyimide nanofibers; the preparation method comprises the following steps: adding polyimide nanofibers, high-molecular-weight polyethylene glycol diacrylate and low-molecular-weight polyethylene glycol diacrylate into water, uniformly dispersing, and then adding ammonium persulfate and tetramethylethylenediamine to obtain a first mixed solution; performing freeze polymerization reaction on the first mixed solution, and performing freeze drying after the reaction is finished to obtain the nanofiber-based shape memory aerogel. The aerogel has excellent mechanical properties and shape memory properties, and can be widely applied to the industry.

A sealing gel with delayed gelation for well cementation, its preparation method, and application are provided. The sealing gel with delayed gelation for well cementation includes 2-3 parts of anionic polyacrylamide, 3-4 parts of cationic acrylamide, 1 part of stabilizer, 1 part of cross-linking agent and 6 parts of distilled water; the stabilizer is obtained by the reaction of citric acid and ethylenediaminetetraacetic acid disodium under the action of initiator, the cross-linking agent is obtained by the reaction of chromium lactate and chromium nicotinate under the action of azo diisobutyl amidine hydrochloride and tetramethylethylenediamine. Based on the purpose of well cementation, the sealing gel has pH sensitivity, which prolongs the gelation time of the gel that is originally rapidly formed at a certain temperature, so that it can be added to the pre-liquid system.

This invention relates to the field of organic synthesis technology, specifically to a highly efficient and stable Grignard preparation and its green preparation method. By weight, it comprises 8-18 parts of a magnesium source, 40-92 parts of a halogenated hydrocarbon, 150-200 parts of a green solvent, 15-20 parts of ethylene glycol dimethyl ether, and 2.3-3.2 parts of a synergistic stabilizer. The green solvent is 2-methyltetrahydrofuran, or a composite solvent with a weight ratio of 2-methyltetrahydrofuran:methyl tert-butyl ether of 150-160:40-50. The synergistic stabilizer is composed of 1.5-2.0 parts of N,N,N',N'-tetramethylethylenediamine and 0.8-1.2 parts of butylated hydroxytoluene, or composed of 1.5-2.0 parts of N,N,N',N'-tetramethylethylenediamine and 1.0 part of phenothiazine. This invention uses a green solvent system to replace traditional toxic and harmful solvents, and combines it with a solvent recovery process to achieve solvent recycling, which greatly reduces waste emissions and makes the production process safer and more environmentally friendly, in line with the development direction of green chemical industry.

The invention relates to a hydrogel with both strength and electromagnetic wave absorption and a preparation method thereof. The preparation method of the hydrogel material comprises the following steps: S1, carrying out amination treatment on Fe3O4; s2, adding Fe3O4-NH2 and GO in the step S1 into deionized water, and carrying out ultrasonic dispersion; s3, adding polyethylene glycol methyl ether acrylate-480 and acryloyl morpholine into the dispersion liquid in the S2, and dissolving the polyethylene glycol methyl ether acrylate-480 and the acryloyl morpholine to obtain a mixed liquid; s4, removing dissolved oxygen in the mixed solution in S3, sealing the container, and stirring under an ice bath condition; s5, adding potassium persulfate and N, N, N ', N'-tetramethylethylenediamine into the mixed solution stirred in the step S4, and closing the container again; s6, the container is subjected to a polymerization reaction at the temperature of 60 DEG C, and hydrogel is obtained. Compared with the prior art, when the thickness of the hydrogel material is 2.07 mm, strong broadband microwave absorption is achieved, RLmin is-57.0 dB, EABmax is 6.4 GHz, meanwhile, excellent flexibility is kept, and the work provides a new view angle for developing a high-flexibility and efficient electromagnetic wave absorber.

The present invention relates to a composition comprising at least one amine selected from the group consisting of N,N,N',N'-tetramethylethylenediamine, N,N,N',N'- tetramethylpropylenediamine, 1,8-diazabicyclo[5.4.0]undec-7-ene, N,N- dimethylethylenediamine, 4-methylmorpholine, dimethyl-(2-azidoethyl)amine and mixtures thereof; at least one organic solvent selected from the group consisting of acetonitrile, dimethyl isosorbide, acetone, dimethylsulfoxide, and mixtures thereof; and at least one carboxylic, nitrate, or sulfate salt of a transition metal; wherein the transition metal is completely dissolved in the composition. The invention also relates to hypergolic compositions and uses thereof.

The application provides a fluorine-substituted graphdiyne-protected zinc ion secondary battery zinc negative electrode and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a reaction solution, wherein the reaction solution comprises 1,3,5-trifluoro-2,4,6-tri-alkynyl benzene, cuprous iodide, pyridine, tetrahydrofuran and N,N,N',N'-tetramethyl ethylenediamine; and (2) taking a zinc foil as a substrate, and preparing the fluorine-substituted graphdiyne-protected zinc ion secondary battery zinc negative electrode in situ on the surface of the zinc foil through a cross-coupling reaction of 1,3,5-trifluoro-2,4,6-tri-alkynyl benzene in the reaction solution. According to the preparation method, the fluorine-substituted graphdiyne can be controllably grown on the surface of the zinc foil through an in-situ preparation method, the preparation method has the advantages of mild conditions, simple operation and suitability for large-scale preparation. Moreover, the prepared fluorine-substituted graphdiyne-protected zinc ion secondary battery zinc negative electrode can be used as a new negative electrode material of the zinc ion secondary battery, can inhibit zinc dendrite growth and relieve hydrogen evolution, and can significantly improve the cycle life of the zinc ion secondary battery.

The application belongs to the technical field of adsorbents, and provides a composite adsorbent material for uremia and a preparation method thereof, and the preparation steps are as follows: S1. Acrylamide, N,N'-methylenebisacrylamide, glycerol and deionized water are mixed, stirred, sodium alginate is added, stirred and dissolved, ammonium persulfate, calcium sulfate and tetramethylethylenediamine are sequentially added, stirred, ultrasonically treated, and heated and reacted to obtain a sodium alginate derivative; S2. The sodium alginate derivative and deionized water are mixed, modified high-density polyethylene is added, stirred, and soaked in a CaCl2 solution for crosslinking to obtain a sodium alginate composite material; S3. CeO2 / MoS2 functional material, sodium alginate and deionized water are mixed, the sodium alginate composite material is added and stirred, shaped, soaked in a CaCl2 solution for crosslinking, washed, and dried to obtain the composite adsorbent material. The composite adsorbent material has a high adsorption rate and high adsorption capacity for uremia toxins, and has good biocompatibility and hemocompatibility.

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.

This invention relates to DNA-functionalized thermosensitive phase transition polymers, their preparation methods, and applications, belonging to the interdisciplinary field of functional polymers and biomaterials. It aims to solve the technical problems of existing exosome separation methods, such as long processing time, low purity, high cost, and inability to specifically separate exosome subtypes. This invention provides a polymer prepared via free radical polymerization using N-isopropylacrylamide and acrylamide-modified DNA as monomers, and ammonium persulfate and tetramethylethylenediamine as initiators. This polymer exhibits reversible phase transition properties at physiological temperatures and is applied to the separation and detection of exosome subtypes. Specific capture and quantitative analysis are achieved through DNA recognition probes and fluorescently labeled antibodies. The polymer of this invention is simple to operate, quick to prepare, low in cost, and high in purity. It requires only a common centrifuge for non-destructive separation of exosomes and can integrate detection functions, providing technical support for diagnosis and detection.

The invention belongs to the field of organic solar cell acceptor material preparation, and discloses a preparation method of an organic non-fullerene acceptor intermediate, which comprises the following steps: taking dichloromethane as a solvent, mixing and stirring a compound 1 and a compound A, adding metal chloride in batches, reacting to obtain a compound 2, taking alpha as a solvent, and reacting to obtain the organic non-fullerene acceptor intermediate. Reacting the compound 2, the compound B and alkali liquor, and extracting to obtain a compound 3; taking monohydric alcohol as a solvent, reacting the compound 3 with sodium hydroxide, removing the solvent, adding water, adjusting the pH value to 1-2, stirring, filtering and drying to obtain a compound 4; taking beta as a solvent, reacting the compound 4, tetramethylethylenediamine and cuprous oxide to the end point, adding an acidifying agent, extracting with petroleum ether, filtering the obtained organic phase with diatomite, washing a filter cake with petroleum ether, removing the organic solvent under reduced pressure, and drying to obtain a compound 5; taking tetrahydrofuran as a solvent, reacting the compound 5, extracting with petroleum ether, and removing the organic solvent under reduced pressure to obtain a compound 6;

The present application relates to the technical field of biomedical materials, and particularly relates to a 3D-printed self-produced electricity hydrogel scaffold for promoting wound healing and a preparation method and application thereof, comprising an anode scaffold and a cathode scaffold, the anode scaffold is prepared from a zinc-containing hydrogel, and the cathode scaffold is prepared from an iron-containing hydrogel; the anode scaffold further comprises a prepolymerization solution prepared from dopamine, ammonium persulfate, N,N'-methylene bisacrylamide, acrylamide and tetramethylethylenediamine; the hydrogel scaffold can gradually degrade to release metal ions, play an anti-inflammatory and angiogenic role, can remove free radicals such as active oxygen and active nitrogen, and play an antioxidant role; the output voltage can be stabilized for more than 7 days, the expression of repair-related genes can be improved through physiological micro-current stimulation, the proliferation and migration of fibroblasts can be promoted, the wound can be accelerated to realize scarless healing within 16 days, and the hydrogel scaffold has a wide application prospect.

The application discloses a preparation method of an ion-thermal sensitive composite gel for efficiently extracting nicotine. The method comprises the following steps: physically mixing boron nitride (BN) and anhydrous citric acid, ball milling, washing, centrifuging and drying to obtain boron nitride nanosheets. Then, the boron nitride nanosheets and ionic liquid are reacted under a nitrogen atmosphere for 24 h to obtain ionic liquid-boron nitride nanosheets (IL-BNNs). The IL-BNNs are dispersed into a monomer solution, a crosslinking agent is added after the formation of the gel, and then tetramethylethylenediamine and ammonium persulfate are added and stirred in an ice bath. The mixed system is transferred into a mold to react for 12-24 h to obtain the ion-thermal sensitive composite gel. The application forms dense nicotine binding sites in the interior of the composite material by using ionic liquid, so that the adsorption-desorption performance of the material to nicotine is enhanced. Meanwhile, the desorption performance of the material is strengthened by using the thermal conductivity of boron nitride and the phase change characteristics of the gel, so that the nicotine extraction process is simplified, and the amount of eluent in the nicotine recovery process is reduced.

The application discloses a self-adapting hydrogel coupling agent and a preparation method and application thereof, and belongs to the field of medical devices, and particularly relates to a preparation method of a self-adapting hydrogel coupling agent; the preparation method comprises the following steps: under the conditions of light avoidance and sterility, main monomers, functional monomers, a molecular weight regulator and reinforcing fillers are dissolved in sterilized deionized water, and then free radical polymerization is carried out under the action of a persulfate solution and tetramethylethylenediamine, and after dialysis and sterilization treatment, the self-adapting hydrogel coupling agent is obtained. The self-adapting hydrogel coupling agent prepared by the application eliminates tissue deformation caused by probe pressurization, significantly improves the measurement accuracy of an actual distance of a target in an operation by ultrasonic waves, and is good in biocompatibility, can be sterilized, is convenient to operate, and is suitable for open or endoscopic operation wounds.

The present invention discloses a solar heat-absorbing material and a preparation method thereof, belonging to the technical field of preparation of heat-absorbing materials. The raw materials for preparing the heat-absorbing material in the present invention mainly include silicon carbide powder, silica sol, silane coupling agent KH550, tetramethylethylenediamine, calcium carbonate, porous graphene, and polyvinylidene fluoride. In order to avoid problems such as environmental pollution and low density of the material itself existing in the existing preparation methods, the present invention first prepares a kind of porous graphene, and then uses the porous graphene to prepare the solar heat-absorbing material, so that the adhesion between the porous graphene and the foam ceramic slurry is firm, and the solar heat-absorbing material is obtained by sintering and heat preservation. Through the above steps, not only the properties such as hardness and porosity of the solar heat-absorbing material are improved, but also the environmental pollution caused by the release of organic gases during sintering in the traditional method is reduced.

The invention relates to the field of postoperative adhesion medicines, in particular to zwitter-ion nanogel, a preparation method thereof and application of the zwitter-ion nanogel in preparation of postoperative adhesion medicines and secondary adhesion medicines. The preparation method of the zwitterionic nanogel comprises the following steps: preparing a polymer which is a zwitterionic monomer; a nano silicate; the crosslinking agent is ethylene glycol dimethacrylate, the catalyst is tetramethylethylenediamine, and the photoinitiator is 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy) phenyl]-1-acetone. According to the preparation method of the zwitterionic nanogel, synthesis is simple, and the nanogel prepared through the method has excellent biological activity and mechanical performance and has excellent anti-adhesion capacity. Compared with commercial anti-adhesion hydrogel, the zwitterionic nanogel prepared by the invention can safely and reliably prevent postoperative adhesion and secondary adhesion, and has great clinical potential.

The present invention relates to a delayed-gelation plugging gel for well cementation, and a preparation method therefor and the use thereof. The delayed-gelation plugging gel for well cementation comprises 2-3 parts of anionic polyacrylamide, 3-4 parts of cationic acrylamide, 1 part of a stabilizer, 1 part of a cross-linking agent, and 6 parts of distilled water, wherein the stabilizer is obtained by reacting citric acid with disodium ethylenediaminetetraacetate under the action of an initiator; and the cross-linking agent is obtained by reacting chromium lactate with chromium nicotinate under the action of azodiisobutylamidine hydrochloride and tetramethylethylenediamine. For the purpose of well cementation, a delayed-gelation plugging gel is provided. The plugging gel is pH-sensitive. By prolonging the gelation time of the gel that originally gelates fast at a certain temperature, a preflush system to which the delayed-gelation plugging gel is added can effectively plug a lost circulation zone when arriving at a destination formation, thereby laying a foundation for the subsequent operation of cement injection.

The invention belongs to the technical field of grouting materials, and particularly relates to an anti-aging hydrogel composite grouting material for water gushing plugging and a preparation method of the anti-aging hydrogel composite grouting material. The composite grouting material comprises the following components in parts by mass: anti-aging hydrogel, and the anti-aging hydrogel is prepared from the following raw materials in parts by mass: 60-80 parts of a poly (N-isopropylacrylamide) solution, 20-40 parts of a sodium acrylate solution, 1 part of ammonium persulfate, 1 part of N, N-dimethylformamide, 1 part of a cross-linking agent, 1 part of a cross-linking agent, 1 part of a cross-linking agent, 1 part of a cross-linking agent, and 1 part of a cross-linking agent. The concrete is prepared from, by weight, 1 part of N, N-methylene bisacrylamide, 0.775 part of tetramethylethylenediamine, 1-3 parts of composite cement, 3 parts of a surface enhancer and 1 part of a water guide agent. The composite cement comprises the following components: sulphoaluminate cement clinker and gypsum. According to the invention, the aging resistance of the hydrogel for water burst plugging can be improved. In addition, the addition of the composite cement also helps to improve the expansion rate of the prepared anti-aging hydrogel, so as to improve the effect of water gushing plugging.

The invention discloses a preparation method and application of a swelling-inhibiting dual-network membrane, and the method comprises the following steps: (1) putting chloromethylated polysulfone and tetramethylethylenediamine into a NaOH solution for pre-crosslinking to obtain a crosslinked chloromethylated polysulfone solution; (2) mixing the cross-linked chloromethylated polysulfone solution with the sulfonated polyetheretherketone solution, stirring at 60-80 DEG C for 2-4 hours, then cooling to 40-50 DEG C at a rate of 5-10 DEG C / h, and stirring at a constant temperature for 8-12 hours to obtain a membrane casting solution; and (3) drying the membrane casting solution to prepare the swelling-inhibiting dual-network membrane. According to the invention, through precise regulation and control of covalent cross-linked network density and directional optimization of a blended microphase structure, synergistic improvement of swelling inhibition, efficient ion conduction, excellent mechanical properties and zinc dendrite resistance is synchronously realized in a strong alkaline environment.

The invention relates to the technical field of ceramics, in particular to a method for combining silicon carbide nanowires with silicon carbide ceramics. The preparation method comprises the following steps: 1, putting an ethanol solution into a container, adding acrylamide and N, N-methylene bisacrylamide, and dissolving to form a premixed solution; 2, Si powder and activated carbon are ground, and mixed powder is obtained; step 3, adding the mixed powder in the step 2 into the premixed solution in the step 1, then adding an ammonium persulfate solution and N, N, N, N-tetramethylethylenediamine, immediately pouring into a silica gel mold, and standing at room temperature; and step 4, after demolding, placing the product in a nitriding furnace for heat treatment to obtain the silicon carbide nanowire combined silicon carbide porous ceramic. The product has high porosity of 60%, compressive strength of 2.6 MPa, good electromagnetic wave absorption performance, minimum reflection loss (RLmin) of 50.2 dB, maximum effective absorption bandwidth (EABmax) of 9.6 GHz and low heat conductivity coefficient of 0.074 W / (m.K).