256 results about "Acrydite" patented technology

The invention discloses a perovskite solar cell based on buried interface modification and a preparation method and application thereof. The invention relates to an application of 2-(acrylamide) benzoic acid and / or 2-(4-pentenoylamido) benzoic acid in a trans-perovskite solar cell buried interface modifier. According to the invention, 2-(acrylamide) benzoic acid and / or 2-(4-pentenylamido) benzoic acid are / is used as a buried interface modifier, such molecules take benzoic acid as an anchoring group, and through the synergistic effect among carboxyl, amido and carbon-carbon double bonds, the defects at the thin film grain boundary of the hole transport layer and the perovskite layer are reduced; according to the invention, the NiOX thin film is introduced into the small molecules, and the alkyl chain is further introduced into the small molecules and can effectively fill small recesses and holes in the NiOX thin film, so that the flatness of the NiOX thin film is improved, a compact and compact modification layer is formed, the morphology of the perovskite layer thin film is further regulated and controlled, and the photoelectric conversion efficiency of the perovskite solar cell is improved.

The invention provides a high-barrier nanocellulose-based composite liquid mulching film and a preparation method thereof.The preparation method comprises the steps that sodium periodate is added into a sodium alginate solution for an oxidation reaction, an oxidized sodium alginate solution is obtained, a chitosan solution is added into the oxidized sodium alginate solution, and a composite solution is obtained after uniform mixing; mixing the nanocellulose solution with the composite solution, dropwise adding an ammonia water solution to adjust the pH value, and carrying out a cross-linking reaction to obtain a matrix solution; the preparation method comprises the following steps: dissolving 2-acrylamido-2-methylpropanesulfonic acid and methacryloyloxyethyl trimethyl ammonium chloride in deionized water to obtain a precursor solution, and adding an initiator into the precursor solution for copolymerization to obtain a zwitterionic polymer; adding a zwitterionic polymer into the Na-montmorillonite dispersion liquid for intercalation reaction to obtain modified montmorillonite; and uniformly mixing the matrix solution, the modified montmorillonite, the plasticizer, the rheology modifier and the surfactant, and then carrying out standing curing and vacuum defoaming.

The invention provides a natural polymer shear strength improving agent for temperature-resistant tackifying water-based drilling fluid as well as a preparation method and application of the natural polymer shear strength improving agent. The shear strength improving agent is prepared from the following raw materials in parts by mass: 1 to 7 parts of carboxymethyl starch, 1 to 5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 5 parts of dimethyl diallyl ammonium chloride, 1 to 5 parts of N-vinyl pyrrolidone, 1 to 5 parts of acrylamide, 0.01 to 0.05 part of an initiator I, 0.01 to 0.05 part of an initiator II, 0.01 to 0.07 part of a cross-linking agent epoxy chloropropane, 50 to 70 parts of water and 150 to 220 parts of absolute ethyl alcohol. According to the shear strength improving agent, natural high polymer materials are used, a polymer net structure is formed through polymerization reaction, the cross-linking agent is used for promoting the net structure to be tighter for tackifying, and the shear strength improving agent has better thermal stability, dynamic shear force, flocculation capacity and suspension stability while the cost and the environmental load are reduced.

The invention belongs to the technical field of oily sludge cleaning, and particularly relates to a macromolecular / micromolecular composite surfactant for intensively cleaning oily sludge. A main monomer (such as acrylamide), a hydrophilic monomer (such as 2-acrylamido-2-methylpropanesulfonic acid) and a hydrophobic monomer (such as methacrylic acid long-chain alkyl ester) are mixed, and the macromolecular surfactant is synthesized through free radical polymerization. The specific long-chain structure of the macromolecular surfactant can form larger micelles, colloid and asphaltene can be effectively wrapped, the macromolecular surfactant is compounded with the micromolecular surfactant for use, and mixed micelles with higher solubilizing capacity can be formed, so that the colloid and asphaltene in the high-medium-concentration oily sludge can be efficiently removed, and the high-medium-concentration oily sludge can be effectively removed. Further, the removal rate of total petroleum hydrocarbon is improved. The invention provides a new technology for high-efficiency deep treatment of high-medium-concentration oily sludge.

The invention relates to the technical field of fibers, and discloses an easily biodegradable polyester-nylon composite fiber and a preparation process thereof.The preparation method comprises the steps that 2-(2-acrylamido ethyl formate) benzoic acid is subjected to graft modification to obtain modified polylactic acid, and the modified polylactic acid, polyethylene glycol terephthalate PET and nylon 66 resin are subjected to blending melt spinning to obtain the polyester-nylon composite fiber. The modified polylactic acid improves the compatibility between the PET and the nylon 66 resin, so that the polyester-nylon composite fiber has higher mechanical properties, and the tensile strength and the elongation at break are obviously improved. The polylactic acid has better biodegradability, and the introduced ester group also has biodegradability, so that the biological decomposition rate of the fiber is improved. The modified polylactic acid contains a large amount of hydrophilic carboxyl and amido bonds, so that the moisture regain of the composite fiber is improved, and the modified polylactic acid can be better applied to hydrophilic moisture absorption fiber textiles.

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 discloses a high-salt-tolerance structured fracturing fluid and a preparation method thereof, and the fracturing fluid is prepared by taking a flowback fluid as a base fluid and adding a high-molecular polymer and a macromolecular surfactant. Wherein the high-molecular polymer is prepared by polymerizing five monomers, namely acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, a hydrophobic monomer A, sodium p-styrenesulfonate and N-vinyl pyrrolidone; the hydrophobic monomer A is long-chain alkyl quaternary ammonium salt. The macromolecular surfactant is prepared by polymerizing five monomers, namely acrylamide, butyl acrylate, acrylic acid, a hydrophobic monomer B and sodium p-styrenesulfonate; the hydrophobic monomer B is selected from at least one of 2-(acrylamide) sodium dodecyl sulfonate, 2-(acrylamide) sodium tetradecanesulfonate and 2-(acrylamide) sodium hexadecanesulfonate. The fracturing fluid prepared by adopting the flowback fluid or saline water with the total mineralization degree of 85,000 as the base fluid still keeps good viscosity, and good salt resistance and sand-carrying performance are guaranteed.

The invention discloses polyacrylamide for a screw press of a pulp paper plant. The polyacrylamide is prepared from the following components in parts by weight: 3 to 10 parts of acrylamide, 1 to 6 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.1 to 3 parts of dimethyl diallyl ammonium chloride, 0.01 to 1 part of hydrophobic modifier, 0.01 to 0.5 part of cross-linking agent and 0.001 to 0.01 part of initiator. The invention also discloses a preparation method of the polyacrylamide. According to the invention, through copolymerization of the composite acrylamide and the salt-resistant monomer and combination of cross-linking modification, the salt resistance, shear resistance and floc strength of polyacrylamide are improved. By introducing hydrophobic groups, the adhesiveness of the filtrate is reduced, backmixing of the squeezed filtrate is reduced, and the dehydration speed and the floc stability are balanced.

This invention provides a dry powder drag-reducing agent for fracturing fluids and its preparation method, belonging to the technical field of fracturing materials for drilling. The method includes the following steps: dissolving 4-bromobutyryl chloride and N-dodecylmethylamine in acetonitrile, heating and stirring to react; adding polyethylene glycol monomethyl ether acrylate and dichloromethane; stirring under a nitrogen atmosphere; purifying to obtain a double-tailed hydrophobic monomer; mixing core-shell Fe3O4 / SiO2 composite nanoparticles, ethanol aqueous solution, KH570, and ammonia solution; stirring; purifying to obtain modified SiO2 / Fe3O4; adding acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate, the double-tailed hydrophobic monomer, and modified SiO2 / Fe3O4 to water; adjusting the pH value; mixing and stirring with nitrogen gas; adding an azo initiator; stirring; cooling; purifying; vacuum drying; and pulverizing into powder to obtain the dry powder drag-reducing agent for fracturing fluids. This invention achieves good drag-reducing performance while also possessing certain heat resistance, making it better suited for fracturing operations in drilling processes.

The invention relates to a crystal form of 2-acrylamide-2-methylpropanesulfonic acid potassium salt (ATBS.K). The X-ray powder diffraction pattern of the crystal form has characteristic peaks at 2 theta (+ / -0.1 degrees) of 13.1 degrees, 14.4 degrees, 16.3 degrees, 19.8 degrees, 23.5 degrees, 24.3 degrees, 26.9 degrees, 27.6 degrees, 29.3 degrees, 30.6 degrees, 31.6 degrees, 34.3 degrees, 36.1 degrees, 41.7 degrees, 44.6 degrees and 46.7 degrees.

The invention provides a temperature-resistant and salt-resistant polymer viscosity reducer for a drilling fluid and a preparation method of the temperature-resistant and salt-resistant polymer viscosity reducer. The phosphine-containing polymer viscosity reducer can be prepared from a carboxylic acid group-containing monomer, a sulfonic acid group-containing monomer, a phosphine-containing compound and phosphorous acid through a polymerization reaction; the carboxylic acid group-containing monomer is selected from one or more of acrylic acid, methacrylic acid and maleic acid, and the sulfonic acid group-containing monomer is selected from 2-acrylamido-2-methylpropanesulfonic acid or 2-acryloyloxy-2-methylpropanesulfonic acid; the phosphine-containing compound is selected from any one of ethylene diamine tetra (methylene phosphonic acid), 1-hydroxyethylidene-1, 1-diphosphonic acid and amino trimethylene phosphonic acid. The obtained phosphine-containing polymer viscosity reducer with the corresponding structure is good in temperature resistance and salt resistance, salt resistance reaches saturation, and under the conditions of high temperature and salt pollution, the viscosity reducer still has a good viscosity reduction effect and has good temperature resistance and salt resistance; and moreover, reaction raw materials in the preparation are few, the synthesis process is simple, the cost performance is relatively high, and application is facilitated.

The invention belongs to the technical field of bioengineering, and particularly relates to a method for purifying single-stranded DNA and application thereof. The invention provides a method for purifying single-stranded DNA (deoxyribonucleic acid). The method comprises the following steps: S1, carrying out polymerization reaction on a primer of which the 5'end is modified with an acrylamide group to generate a linear polyacrylamide modified primer LPA-primer; s2, by taking the LPA-primer as a primer, carrying out PCR (Polymerase Chain Reaction) amplification, so as to obtain a double-stranded DNA (Deoxyribose Nucleic Acid) NALPA-dsDNA (Deoxyribose Nucleic Acid) crosslinked by polyacrylamide; s3, carrying out denatured agarose gel electrophoresis on the LPA-dsDNA under an alkaline condition, and separating a target ssDNA from a non-target ssDNA by utilizing a mobility difference caused by a polyacrylamide modified group; and S4, carrying out gel cutting and recycling on the target ssDNA strip to obtain the purified ssDNA. The result of the embodiment shows that the method can effectively improve the purity of the single-stranded DNA and reduce the cost.

The invention relates to an ultrahigh-temperature and high-salinity water shutoff system and a preparation method and application thereof, and belongs to the field of oilfield water shutoff systems, and the ultrahigh-temperature and high-salinity water shutoff system comprises the following substances in parts by weight: 8-10 parts of 2-acrylamido-2-methylpropanesulfonic acid, 6-10 parts of N-vinyl caprolactam, 6-8 parts of N-isopropylacrylamide and 4-6 parts of monostearyl maleate. The invention relates to a water-based adhesive which is prepared from the following components in parts by weight: 6 to 10 parts of 2-acrylamido-2-methylpropanesulfonic acid, 3 to 5 parts of dimethylaminoethyl methacrylate, 0.2 to 0.4 part of dimethyl 2-butenedioate trimethylolpropane triacrylate, 3 to 5 parts of modified nanoscale silicon dioxide, 2 to 4 parts of modified nanoscale calcium carbonate and 100 to 120 parts of deionized water. The plugging agent provided by the invention can still maintain good plugging performance in an oil reservoir environment in which the underground temperature of an oil field exceeds 120 DEG C and / or the degree of mineralization is higher than 100000mg / L, so that the plugging efficiency of a water seepage layer of an oil well in the oil field is ensured.

The invention provides a modified starch-based temporary plugging agent suitable for oil-based drilling fluid as well as a preparation method and application of the modified starch-based temporary plugging agent. The preparation method of the modified starch-based temporary plugging agent comprises the following steps: adding starch sodium octenylsuccinate into water, uniformly stirring, then adding acrylamide, butyl acrylate, 2-acrylamido-2-methylpropanesulfonic acid and N, N '-methylene bisacrylamide, uniformly stirring, and adjusting the pH value to 6-8 to obtain a water phase; adding the emulsifier into the white oil, and uniformly stirring to obtain an oil phase; adding the water phase into the oil phase, and emulsifying to obtain an emulsion; adding an initiator into the obtained emulsion, and reacting to obtain a reaction solution; and adding ethanol into the obtained reaction liquid for precipitation, centrifuging, washing, drying and grinding to obtain the product. The temporary plugging agent disclosed by the invention is stable in dispersion in an oil-based drilling fluid system, high in high-temperature plugging capacity, capable of efficiently plugging a high-permeability channel and automatically degrading, and capable of meeting the plugging and reservoir protection requirements of the deep well oil-based drilling fluid.

The application belongs to the technical field of seawater desalination, and more particularly relates to a zwitterionic copolymer hydrogel with high pore connectivity and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding a crosslinking agent and a photoinitiator into a mixed aqueous solution containing methacryloyloxyethyl trimethyl ammonium chloride, 2-acrylamido-2-methyl propane-1-sodium sulfonate and Na2SO4, mixing uniformly, and performing polymerization under ultraviolet light to form a polymer; and (2) forming a photothermal layer on the surface of the polymer, and post-treating to obtain the zwitterionic copolymer hydrogel with high pore connectivity. The hydrogel prepared by the application has the characteristics of high pore connectivity, and can still maintain excellent evaporation rate in the process of continuous operation; and has excellent salt shrinkage resistance. The hydrogel prepared by the application has wide application in the fields of water treatment, seawater desalination and fresh water recovery.

The invention belongs to the technical field of oil exploitation, and particularly relates to a fracturing fluid thickening agent as well as a preparation method and application thereof. The preparation method comprises the following steps: adding aminomethane tripropionic acid, ethanol and allyl chloride into a first reactor, carrying out a heat preservation reaction, and carrying out reduced pressure distillation to obtain a first functional monomer; adding 3-amino-1, 5-naphthalene disulfonic acid disodium salt, ethanol and allyl chloride into a second reactor, carrying out a heat preservation reaction, and carrying out reduced pressure distillation to obtain a second functional monomer; adding acrylamide, 1, 5-hexadiene-3, 4-diol, 3-[(3-acrylamidopropyl) dimethylammonium] propionate, a first functional monomer, a second functional monomer, monopotassium phosphate and water into a third reactor, dropwise adding an initiator, carrying out heat preservation reaction, adding ethanol, separating out precipitate, centrifuging to obtain a solid, and drying overnight to obtain the thickening agent. The thickening agent provided by the invention has the advantages of high apparent viscosity, strong shear resistance and strong antibacterial ability.

The invention provides salt-resistant soil for drilling fluid as well as a preparation method and application of the salt-resistant soil, and relates to the field of drilling fluid. The salt-resistant soil for the drilling fluid is prepared from the following raw materials in parts by weight: 25 to 30 parts of purified sepiolite, 7 to 20 parts of 2-acrylamido-2-methylpropanesulfonic acid, 7 to 10 parts of N, N-dimethylacrylamide, 9 to 15 parts of a cationic monomer and 1 to 2 parts of an initiator. The invention further provides a preparation method of the salt-resistant soil for the drilling fluid and application of the salt-resistant soil in the water-based drilling fluid. The salt-resistant soil for the drilling fluid provided by the invention can keep a good slurry making rate in fresh water, saturated salt water and composite salt water, has good rheological property and outstanding temperature resistance, is suitable for various drilling fluid systems, is wide in application range, particularly can be used for directly making slurry by using seawater in offshore drilling operation, and has a wide application prospect. And the construction is more convenient in an environment lacking fresh water resources.

The invention relates to the technical field of adhesives, and discloses an adhesive film capable of bonding UV curing ink and a preparation method of the adhesive film. According to the invention, the EVA composite adhesive is coated on the surface of the PET film base material layer, and then a layer of PET release film is covered, so that the adhesive film capable of bonding the UV curing ink is obtained. The EVA composite adhesive comprises EVA resin, an alkenyl monomer, methacrylamide glucose, an initiator, alkyl isocyanate and the like; the EVA composite adhesive layer contains a large number of hydroxyl groups and carbamate groups and has better adhesive property and peel strength with urethane acrylate, and the acrylic resin adhesive layer contains a heat-resistant furan ring structure, so that the heat resistance and thermal stability of the acrylic resin adhesive layer are improved.

The application relates to the field of high polymer materials, and particularly discloses an acrylic ester copolymer containing an ionic liquid monomer as well as a preparation method and application thereof. The ionic liquid monomer is capped with an acrylamide group or an acryloyloxy group, is connected to an acrylic ester chain segment main body through a copolymerization mode, and an acrylic ester copolymer solution is obtained. The acrylic ester copolymer solution is made into an electric debonding adhesive layer, the 180-degree peeling strength of which can be reduced by more than 90% under the condition that an applied voltage is less than or equal to 30V and an applied voltage time is less than or equal to 30s, and the performance of the adhesive layer almost does not attenuate after 100 cycles. The problem of high debonding voltage and long debonding time of the acrylic ester pressure-sensitive adhesive is solved. Through aging test, the adhesive layer has high tack, and has no problems of ionic liquid migration, precipitation and surface contamination.

The invention provides a method for removing heavy metals by acidizing bleaching earth. The heavy metals in the bleaching earth are removed by using a heavy metal adsorbent. Firstly, acrylate reacts with diethanol amine to generate an esterification product, then the esterification product reacts with trimethylolpropane to form a hydroxyl-terminated hyperbranched polymer, and then the hydroxyl-terminated hyperbranched polymer reacts with isocyanate acrylate to introduce double bonds to obtain hyperbranched acrylate. Meanwhile, sodium alginate reacts with 4-chlorophenylboronic acid to obtain boric acid modified sodium alginate, then the boric acid modified sodium alginate reacts with tannic acid to introduce a large amount of hydroxyl groups, and finally the boric acid modified sodium alginate reacts with 3-aminopropanol vinyl ether to introduce double bonds, so that the sodium alginate compound containing double bonds is prepared. And copolymerizing the two monomers with acrylic acid, N-(2-aminoethyl) acrylamide and 2-acrylamido-2-methylpropanesulfonic acid to obtain the adsorbent with a three-dimensional network structure and multiple functional groups. Through the treatment, the heavy metal content of the bleaching earth is obviously reduced, no foreign impurities exist, and the functions of high decolorization rate and strong adsorbability are reserved.

The invention discloses a high-temperature-resistant and saturated-salt-resistant filtrate reducer for drilling fluid and a preparation method thereof, and relates to the technical field of filtrate reducers. 2-acrylamido-2-methylpropanesulfonic acid is used as a core monomer, N-vinyl-2-pyrrolidone and acrylic acid monomers are added, a comb-shaped structure with a rigid main chain and a flexible side chain is formed, and the high-temperature-resistant and saturated-salt-resistant filtrate reducer is prepared. The main chain and the side chain have a synergistic effect, so that the high temperature resistance and the saturated salt resistance of the filtrate reducer are improved. Ferroferric oxide precipitates are generated on the surface of the mullite, and the high-temperature resistance of the whiskers can be improved by adding the ferroferric oxide, so that the high-temperature resistance of the filtrate reducer is improved. The polyvinyl alcohol modified mullite whisker and the blended material are subjected to polymerization reaction, the surface of polyvinyl alcohol is provided with hydroxyl, a barrier of a hydrophilic layer can be formed on the surface of the whisker, compression of saturated salt on a polymer is effectively blocked, the polymer is prevented from curling, and therefore the saturated salt resistance and the high-temperature resistance of the filtrate reducer are improved.

The invention belongs to the technical field of coating material preparation, and particularly relates to a hydrogel lubricating coating as well as a preparation method and application thereof. The surface of a substrate material is coated with an MXene bonding solution, a bonding transition layer is obtained on the surface of the substrate material, and the substrate material attached with MXene is obtained; a substrate material attached with MXene is soaked in a hydrogel precursor solution, a hydrogel lubricating coating is obtained on the surface of the substrate material, the hydrogel precursor solution comprises 2-acrylamido-2-methylpropanesulfonic acid, a water-soluble monomer, a cross-linking agent, a catalyst and water, and the water-soluble monomer contains a carbon-carbon double bond functional group. According to the method provided by the invention, the hydrogel lubricating coating can be continuously and controllably prepared on a large scale, external energy input is not needed, the preparation method is simple and high in practicability, and the obtained hydrogel lubricating coating has good lubrication, antibacterial and biocompatibility and has a wide application prospect in the field of material surface lubrication modification.

The present invention relates to a fracturing fluid comprising at least one propane and at least one water-soluble polymer obtained from the crystalline form of 2-acrylamido-2-methylpropanesulfonate sodium salt ATBS.Na. The present invention also relates to a method for preparing the fluid and a method of hydraulic fracturing using the fluid.

The invention discloses a preparation method and application of a modified quartz sand adsorption material, and relates to the technical field of quartz sand adsorption materials.The preparation method comprises the following working steps that S1, alkali activation treatment is conducted; step S2, silanization modification; step S3, potassium persulfate activation; quartz sand is subjected to surface modification through three-step modification treatment, wherein a sodium hydroxide solution is adopted to activate the surface of the quartz sand, and hydroxyl groups are introduced; then, gamma-aminopropyltriethoxysilane (KH550) is used for carrying out silanization modification, and an amino functional group is grafted; finally, after amino is activated through potassium persulfate (K2S2O8), 2-acrylamido-2-methylpropanesulfonic acid (AMPS) is grafted, a sulfonic functional group is introduced, and a new group is introduced to modify the quartz sand, so that the adsorption capacity of the quartz sand as a seed crystal to calcium fluoride in a crystallization-induced coupled fluidized bed system is improved, and the effluent turbidity in the fluidized bed system is reduced. Compared with other seed crystals, the calcium fluoride adsorption capacity is higher, and the effluent turbidity is lower.

The application belongs to the technical field of drilling, and particularly relates to a water-based drilling fluid fluid loss additive, a preparation method thereof and application. The water-based drilling fluid fluid loss additive comprises the following raw materials in parts by weight: acrylamide 5-25 parts, zwitterionic monomer 1-15 parts, 2-acrylamido-2-methylpropanesulfonic acid 5-25 parts, initiator 0.1-0.5 parts, and deionized water 60-200 parts. The disclosed fluid loss additive is safe and environmentally friendly, has excellent fluid loss reduction performance under high-temperature and high-salt conditions, and can meet the drilling requirements of high-mineralization and water-sensitive formations.

Drilling fluids for drilling a wellbore. An example drilling fluid includes an aqueous base fluid, a first fluid loss control additive that is a cross-linked polymer comprising N-vinylpyrrolidone as a monomer, and a second fluid loss control additive that is a cross-linked copolymer comprising a first comonomer of 2-acrylamido-2-methylpropanesulfonic acid in a first comonomer concentration of at least 50 mol % of the copolymer. The second fluid loss control additive additionally includes a second comonomer of an N-vinyl amine-containing monomer, a terminal double bound-containing monomer, or a combination of an N-vinyl amine-containing monomer and a terminal double bound-containing monomer. The second comonomer is present in a total second comonomer concentration of 50 mol % or less of the copolymer.

The invention discloses a treatment method of 2-acrylamido-2-methylpropanesulfonic acid mother liquor, and relates to the technical field of chemical engineering. Comprising the following steps: S1, adding water into the mother liquor generated in the production process of 2-acrylamido-2-methylpropanesulfonic acid for extraction, and standing for layering to obtain an upper layer which is an organic layer and a lower layer which is an aqueous solution; s2, after extraction is completed, an upper organic layer enters a distillation kettle to be subjected to reduced pressure distillation, and the distilled solvent is recycled; distilling in the kettle until precipitates exist, cooling, carrying out solid-liquid separation, and drying to obtain N-tert-butyl acrylamide; and adding an adsorbent into the aqueous solution at the lower layer, filtering to obtain filtrate A, adding caustic soda liquid into the filtrate A until the pH value is 8-10, cooling, adding seed crystal, standing, and carrying out solid-liquid separation on the precipitate to obtain solid sodium sulfate and a 2-acrylamido-2-methyl propanesulfonic acid sodium salt solution. The treatment method is low in cost, simple to operate and high in resource utilization rate, and the extracted product is high in purity.

The invention discloses a biodegradable drag reducer for fracturing as well as a preparation method and application thereof, and the drag reducer is prepared from the following raw materials in parts by weight: 8 to 12 parts of acrylamide, 5 to 8 parts of 2-acrylamido-2-methylpropanesulfonic acid, 2 to 4 parts of dimethyl itaconate, 1.5 to 3 parts of methacrylic acid-beta-cyclodextrin, 0.1 to 0.3 part of cross-linking agent and 0.04 to 0.08 part of initiator. And 70 to 90 parts of deionized water. The drag reducer can be quickly degraded into small molecules in a specific environment, so that the problem of permanent damage of a synthetic drag reducer to a reservoir is fundamentally solved, and the damage rate of a rock core is reduced compared with that of a traditional product; and the drag reduction agent also has excellent self-repairing capability, and after high-speed shearing, the retention rate of the drag reduction rate can still reach 80% or above, so that the long-term stability and effectiveness of the fracturing process are ensured.

The invention discloses a water-absorbent resin microsphere and a preparation method thereof, and belongs to the technical field of high polymer materials. The water-absorbent resin microspheres are prepared from the following raw materials in parts by weight: 20 to 60 parts of acrylic acid, 10 to 30 parts of acrylamide, 10 to 40 parts of 2-acrylamido-2-methyl-1-propanesulfonic acid, 5 to 30 parts of N-isopropylacrylamide, 1 to 10 parts of a hydrochromic compound, 0.1 to 1 part of a cross-linking agent, 0.1 to 1 part of an initiator and 5 to 40 parts of a dispersing agent. The preparation method comprises the following steps: (1) weighing the raw materials; (2) adding a dispersing agent into an oil-phase solvent to obtain an oil-phase solution; (3) mixing and dissolving the rest raw materials in a water-phase solvent to obtain a water-phase solution; and (4) adding the water-phase solution into the oil-phase solution, stirring, heating for reaction, and freeze-drying to obtain the product. The water-absorbent resin microspheres have high sensitivity, good reversibility and stability, and have wide application prospects in the fields of advanced anti-counterfeiting, intelligent sensing, information encryption, controllable release of carriers and the like.

The application discloses a kind of high adhesion hydrogel for electroencephalogram test and its preparation method and application, belong to biomedical engineering technical field.The hydrogel includes the following components crosslinked product: anionic monomer, cationic monomer, monomer and mutual penetration agent;The anionic monomer is any one of malic acid, gluconic acid, citric acid and lactic acid, cationic monomer is betaine or acetyl L-carnitine, monomer is N, N-dimethyl acrylamide, acrylic acid, sodium acrylate, 4-acryloyl morpholine or sodium acrylamidomethyl propane sulfonate, mutual penetration agent is sodium chloride aqueous solution or sodium chloride water-retaining agent solution.Preparation, cationic monomer is mixed and dissolved, vacuum drying, adding photo initiator mixing, then mutual penetration agent is added, and it is obtained by ultraviolet light crosslinking.The hydrogel of the application has high adhesion (adhesion strength reaches 203.22 kPa), high ion mobility and excellent biocompatibility, and the signal gain in EEG and ECG test reaches 2-3 times of traditional conductive paste, which can be widely used in medical conductive paste field.