370 results about "Acrydite" patented technology

The invention discloses a self-crosslinking temperature-resistant salt-resistant emulsion type fracturing fluid thickening agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The raw materials adopted by the invention comprise 30 to 50 parts of an oily solvent, 15 to 25 parts of deionized water, 10 to 20 parts of acrylamide, 5 to 10 parts of acrylic acid, 2 to 4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.05 to 0.2 part of a crosslinking monomer, 0.5 to 1 part of a quaternary ammonium salt type hydrophobic association monomer, 4 to 8 parts of an emulsifier and 1 to 2 parts of a phase inversion agent. The self-crosslinking emulsion is formed through water phase-oil phase mixing, high-speed emulsification, low-temperature initiation polymerization and phase inversion treatment. Based on physical-chemical double-crosslinking temperature control cooperation, a salt-resistant-hydrophobic double-shielding mechanism and an integrated design without an exogenous crosslinking agent, the contradiction between the temperature-resistant and salt-resistant performance of a traditional thickening agent and the process complexity is broken through, and a technical support is provided for efficient development of high-temperature and high-salt oil and gas reservoirs.

The invention discloses an all-solid-state composite dry conductive agent and a preparation method thereof, and belongs to the technical field of batteries. The all-solid-state composite dry conductive agent is prepared by the following steps: uniformly mixing carbon nanotubes, high-dispersion carbon black and graphene to obtain a primary mixture; then preparing a uniformly dispersed glue solution from the composite dispersant and water; and then adding the primary mixture into the glue solution, uniformly mixing, sanding, homogenizing, drying and crushing to obtain the product, the high-dispersion carbon black is obtained by oxidizing carbon black to form active groups such as carboxyl and hydroxyl on the surface of the carbon black, halogenating acyl and then reacting with lithium 2, 5-diaminobenzene sulfonate. The preparation method comprises the following steps: grafting histidine ester into carboxymethyl cellulose by using propylene glycol diglycidyl ester as a cross-linking agent, then introducing allyl-1, 3-sultone, then copolymerizing with lithium 2-acrylamido-2-methylpropanesulfonate and 3-aminobenzoic acid allyl ester protected by fluorenylmethoxycarbonyl, and then deprotecting to obtain the composite dispersant.

The invention provides a dry powder drag reducer for fracturing fluid and a preparation method of the dry powder drag reducer, and belongs to the technical field of fracturing materials for well drilling, and the preparation method comprises the following steps: dissolving 4-bromobutyryl chloride and N-dodecyl methylamine in acetonitrile, heating and stirring for reaction, adding polyethylene glycol monomethyl ether acrylate and dichloromethane, stirring and purifying in a nitrogen atmosphere to obtain a dry powder drag reducer; a double-tailed hydrophobic monomer is obtained; uniformly mixing the core-shell SiO2 / Fe3O4 composite nanoparticles, an ethanol water solution, KH570 and an ammonia solution, stirring, and purifying to obtain modified SiO2 / Fe3O4; the preparation method comprises the following steps: adding acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate, a double-tailed hydrophobic monomer and modified SiO2 / Fe3O4 into water, uniformly mixing, adjusting the pH value, introducing nitrogen, mixing and stirring, adding an azo initiator, stirring, cooling, purifying, carrying out vacuum drying, and crushing into powder, thereby obtaining the dry powder drag reducer for the fracturing fluid. The drag reducer has certain heat resistance while achieving good drag reduction performance, and can be better applied to fracturing operation in the well drilling process.

The invention relates to a self-repairing ionic gel electrolyte, a zinc ion battery and a preparation method and application of the self-repairing ionic gel electrolyte and the zinc ion battery. The ionic gel electrolyte comprises a polymer network, ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate) and movable zinc ions, the polymer network is obtained through a reaction of an anionic monomer 2-acrylamido-2-methyl sodium propanesulfonate and a cationic monomer acryloyloxyethyl trimethyl ammonium chloride, and the movable zinc ions are provided by a zinc tetrafluoroborate hydrate. The zinc ion battery takes the ionic gel as an electrolyte, and a positive film electrode and a negative film electrode are arranged on two sides of the ionic gel. Compared with the prior art, the material not only has excellent mechanical properties and efficient ion transmission capability, but also has the capability of quickly repairing mechanical damage, and the completely broken material can be completely repaired after being contacted for 10 seconds under infrared light irradiation. The prepared zinc ion battery has excellent self-repairing performance, flexible performance and electrochemical performance.

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 relates to the field of oil exploitation, in particular to temperature-resistant and salt-resistant efficient gel as well as a preparation method and application thereof, which are used for solving the problems that the efficiency of the gel is influenced and the oil displacement effect is reduced due to poor high temperature resistance and salt resistance and easiness in failure of the existing polyacrylamide hydrogel. According to the preparation method, through a copolymerization technology, various monomers with excellent temperature resistance and salt resistance, such as acrylamide, methacryloyloxyethyl trimethyl ammonium chloride, 2-acrylamido-2-methylpropanesulfonic acid, a temperature-resistant monomer and a hydrophobic macromonomer, are integrated, so that the gel can bear a relatively high temperature without degradation or performance reduction; the prepared oil displacement gel has good stability in a high-salinity environment, does not lose an oil displacement effect due to the existence of salt, ensures the activity and stability of the gel in a high-temperature and high-salt-content oil reservoir environment, and obviously enhances the oil displacement efficiency of the gel in crude oil exploitation, thereby greatly improving the exploitation efficiency and recovery rate of crude oil.

The present invention relates to the field of ceramic technology, and more specifically, to an alumina ceramic fiber board with a fireproof and heat-insulating function and a nano-ceramic coating, which sequentially includes a nano-ceramic coating and an alumina ceramic fiber board from top to bottom; for the nano-ceramic coating, calculated by mass, the raw materials include: 50-70 parts of an adhesive, 10-20 parts of hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles, 0.1-0.5 parts of 2-acrylamido-2-methylpropanesulfonic acid sodium salt, 0.01-0.1 parts of an initiator, and 10-20 parts of water; the present invention solves the problem that the ceramic fiber board in the prior art cannot meet the fireproof and heat-insulating properties required for ceramic fiber boards in the construction field, and at the same time has excellent adhesion, corrosion resistance, strength, antibacterial property, and hydrophobic and oleophobic properties.

The invention relates to the field of polyacrylamide, in particular to functional polyacrylamide and a preparation method thereof.The functional polyacrylamide is prepared by copolymerization of an acrylamide monomer, an acryloylamino crown ether derivative, a nonionic monomer, an anionic monomer and / or a cationic monomer, an acrylamide structure and a crown ether structure are combined together to synthesize a crown ether monomer with a polymerizable acrylamide group, and the monomer is introduced into a polyacrylamide molecular chain to form a copolymerization product, so that during sewage treatment, heavy metal ions in water are effectively removed while suspended particles are aggregated as a flocculating agent, and the water quality is improved. The heavy metal content after treatment is reduced, and the water treatment agent with multiple effects is formed.

This invention relates to N-(3-(6-Amino-5-(2-(N-methylacrylamido)ethoxy)pyrimidin-4-yl)-5-fluoro-2-methylphenyl)-4-cyclopropyl-2-fluorobenzamide drug substance substantially free of a nitrosamine impurity, e.g. the nitrosamine impurity N-(3-(6-amino-5-(2(methyl)(nitroso)amino)ethoxy)pyrimidin-4-yl)-5-fluoro-2-methylphenyl)-4-cyclopropyl-2-fluorobenzamide and novel processes of preparation thereof. The invention further relates to pharmaceutical composition comprising N-(3-(6-Amino-5-(2-(N- methylacrylamido)ethoxy)pyrimidin-4-yl)-5-fluoro-2-methylphenyl)-4-cyclopropyl-2-fluorobenzamide, wherein the composition is substantially free of a nitrosamine impurity, e.g. the nitrosamine impurity N-(3-(6-amino-5-(2(methyl)(nitroso)amino)ethoxy)pyrimidin-4-yl)-5-fluoro-2-methylphenyl)-4-cyclopropyl-2-fluorobenzamide. Pharmaceutical products containing said drug substance and compositions are also disclosed, as well as methods for preparing said drug substance, pharmaceutical compositions and products.

The invention provides a composite oil-displacing agent for heavy oil cold production and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The composite oil displacement agent is prepared from the following components in parts by weight: 42 to 48 parts of acrylamide, 12 to 14 parts of acrylic acid, 16 to 18 parts of N, N-dimethylformamide, 9 to 10 parts of 2-acrylamido-2-methylpropanesulfonic acid, 10 to 12 parts of allyl 2-ethylbutyrate, 0.5 to 1 part of 2, 2-dimethylolbutanol, 6 to 7 parts of an interfacial tension regulator, 9 to 10 parts of a penetration enhancer, 0.35 to 0.45 part of a slow release initiator, 1 to 2 parts of a stabilizer and 180 to 200 parts of deionized water. A polymerization product obtained by adopting the components can remarkably improve the stability and viscosity of the composite oil-displacing agent, more effectively carry out heavy oil, improve the adsorption capacity of a surfactant on an oil-water interface, reduce the tension of the oil-water interface and improve the recovery ratio.

The present invention discloses a preparation method and application of a single-ion conductor composite binder. The binder is prepared by compounding and modifying a copolymer of butyl acrylate and lithium 2-acrylamido-2-methylpropanesulfonate with polyisobutylene. Its main features are as follows: First, the binder can be completely dissolved in the non-polar solvent toluene, solving the problem of incompatibility between traditional binders and sulfide electrolytes; Second, the unique molecular structure design endows it with excellent adhesion performance and ion conduction ability at the same time, which can significantly reduce the interfacial impedance. The flexible chain segment of butyl acrylate provides elastic support, and the sulfonic acid groups of lithium 2-acrylamido-2-methylpropanesulfonate form strong chemical bonds with the surface of sulfide particles, enhancing the binding force with the electrolyte. The preparation process of the binder of the present invention is simple, the cost is controllable, and it is suitable for large-scale production, providing an important material solution for promoting the industrialization of sulfide all-solid-state batteries.

The invention relates to a method for recycling high-purity graphite from a negative electrode of a waste lithium battery by using a fine washing agent. The method comprises the following steps: preliminarily disassembling the waste lithium battery negative electrode to separate out a negative electrode plate; crushing and screening the negative plate by adopting a machine crusher, and collecting screened fine powder; carrying out heat treatment to remove the binder and other organic matters; stirring and soaking the graphite powder subjected to heat treatment, inorganic acid, sodium carbonate and a fine washing agent; filtering, washing a filter cake with deionized water, and drying to obtain high-purity graphite; the fine cleaning agent is prepared by the following steps: continuously irradiating acrylamide-beta-cyclodextrin, tetramercapto porphyrin, 1-butylene-2, 3, 4-tricarboxylic acid, dimethyl sulfoxide and a photoinitiator at room temperature for 30-80 minutes by keeping ultraviolet light of 365 nm and 10 mW / cm < 2 >, and distilling to remove dimethyl sulfoxide. The fixed carbon content of the recovered graphite can reach 99.98%.

The invention relates to the technical field of organic synthesis, in particular to acrylamido triazine and a preparation method and application thereof.The preparation method comprises the steps that 126 g of melamine is weighed and placed in a three-opening round-bottom flask, 600 g of water and 2-10 g of polymerization inhibitor are added and stirred to be uniform, 60-260 g of acrylic acid is dropwise added, the mixture is heated to 100-140 DEG C, the reaction time is 6-10 h, and a reaction solution is obtained; and filtering the reaction liquid while the reaction liquid is hot, washing a filter cake with water, acetone and ethanol respectively, and drying to obtain the acrylamido triazine. The prepared 1-acrylamide triazine can be used for free radical polymerization reaction to prepare linear formaldehyde-free polymer resin with a triazine ring as a unit structure; the prepared 1, 3-diacrylamido triazine and 1, 3, 5-triacrylamido triazine can perform or participate in free radical polymerization reaction between other unsaturated double bonds to prepare a polymer with a cross-linked structure, and a technical route for preparing an aldehyde-free high-molecular polymer based on melamine is broken through in an application technical method.

The invention provides a multifunctional plugging agent for oil wells with medium and high water content and a preparation method of the multifunctional plugging agent. The plugging agent is prepared from the following substances in percentage by weight: 1-10% of high-strength nano gel particles, 2-5% of nano silicon dioxide dispersion liquid, 1-5% of PPG chitosan pre-crosslinking particles, 1-5% of guanidine gum dry powder, 1-2% of active calcium magnesium aluminum silicate, 0.5-1% of active silica gel, 0.5-1% of sodium sulfonate, 0.1-1% of a crosslinking regulator and the balance of water. Chitosan and cellulose nanocrystals are compounded for use, so that the strength of PPG chitosan pre-crosslinked particles is greatly improved. Chitosan reacts with an acrylamide monomer, 2-acrylamido-2-methylpropanesulfonic acid and a cross-linking agent methylene bisacrylamide to generate a double-network polymer product, so that the gel strength is greatly improved, and higher pressure bearing capacity, plugging capacity, scouring resistance and the like are achieved. Through the synergistic effect of all the components, the plugging water control effect is improved, water is plugged, oil is not plugged, and the plugging agent has important significance on plugging water control in the extra-high water cut period and improvement of oil well productivity.

The invention relates to the field of dry strength agents, and discloses a nano-cellulose modified novel reinforced dry strength agent, which is prepared from the following raw materials in parts by weight: 10 to 20 parts of nano-cellulose, 30 to 50 parts of acrylamide, 10 to 20 parts of methacryloyloxyethyl trimethyl ammonium chloride, 5 to 15 parts of dimethylaminoethyl methacrylate, 3 to 8 parts of itaconic acid, 3 to 8 parts of sodium methallyl sulfonate, 3 to 8 parts of N, N-dimethylformamide, 3 to 8 parts of sodium dodecyl benzene sulfonate, 3 to 8 parts of sodium dodecyl benzene sulfonate, 3 to 8 parts of sodium dodecyl benzene sulfonate, 3 to 8 parts of sodium dodecyl benzene sulfonate, 3 to 8 parts of sodium dodecyl benzene sulfonate and 5 to 10 parts of sodium dodecyl benzene sulfonate. 5 to 15 parts of N, N-dimethylacrylamide, and 5 to 15 parts of 2-acrylamido-2-methylpropanesulfonic acid. Nano cellulose is used as a core reinforcing component, by means of the nanoscale size and high reaction activity, a surface group and fibers form a hydrogen bond and are chemically bonded with a polymeric monomer, a three-dimensional network structure is constructed among the fibers, and electrostatic adsorption of a cationic monomer and the crosslinking effect of a polar group are cooperated, so that the binding force among the fibers of the paper is improved; and the tensile property is obviously enhanced.

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 discloses a reinforced flame-retardant PC composite material and a preparation method thereof, and relates to the technical field of composite materials. Comprising the following raw materials in parts by weight: 80 parts of PC resin, 10-20 parts of hydroxyl-terminated hyperbranched polycarbonate, 5-8 parts of a micro-crosslinking agent, 3-5 parts of a coupling agent, 25-35 parts of a filler, 5-8 parts of hyperbranched tripolyphosphazene terpyridyl CTP-TPY, 2-4 parts of a compatilizer, 0.3-0.6 part of an antioxidant, 0.3-0.6 part of a lubricant, 0.8-1.2 parts of an initiator and 1-3 parts of 9, 10-di-tert-butyl-4-methylphenol. The invention relates to a high-temperature-resistant anti-corrosion coating which is prepared from the following components in parts by weight: 2-6 parts of 2-acrylamido-2-methylpropanesulfonic acid, 2-4 parts of 1, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 1-3 parts of octaphenylcyclotetrasiloxane, 4-6 parts of 2-acrylamido-2-methylpropanesulfonic acid and 0.8-1.2 parts of a catalyst. The reinforced flame-retardant PC composite material is good in mechanical property and excellent in flame retardance, impact toughness and weather resistance.

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 a pre-crosslinking surface active copolymerized nano-microsphere profile control agent for oil extraction and a preparation method thereof, and belongs to the technical field of profile control and water shutoff of oil fields. The nano-microsphere profile control agent is prepared from the following components in parts by weight: 50 to 60 parts of acrylamide, 10 to 15 parts of acrylic acid, 5 to 10 parts of methacryloyloxyethyl trimethyl ammonium chloride, 2 to 4 parts of an emulsifier, 0.5 to 1 part of nonylphenol polyoxyethylene ether, 8 to 12 parts of coal-based Fischer-Tropsch liquid wax, 2 to 4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.1 to 0.3 part of a cross-linking agent and 0.05 to 0.1 part of an initiator. The emulsifier is prepared by reacting pentaerythritol with linoleic acid to generate a tetraester compound, then generating an epoxy compound under the action of formic acid and H2O2, and then reacting with laurinol. The prepared copolymerized nano-microsphere profile control agent is relatively small in particle size and can enter the deep part of a stratum, and the microsphere solution can realize step-by-step plugging due to mild expansibility.

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 belongs to the technical field of production processes of chemical products, and relates to a device and a method for continuously preparing 2-acrylamido-2-methylpropanesulfonic acid. The annular pipeline reaction system comprises a crystallization reactor, a tubular reactor group and a mother liquor internal circulation pipeline which form an annular passage; the solid-liquid separation refining system comprises a solid-liquid separation device, a reduced pressure distillation device, a product refining device, a drying device and a heat exchanger; the external circulation and feeding system comprises a mother liquor external circulation pipeline, an isobutene feeding pipeline, a sulfuric acid feeding pipeline, an acrylonitrile feeding pipeline and an acrylonitrile reflux pipeline; the acrylonitrile feeding pipeline is divided into three branches, one branch is connected with the crystallization reactor, one branch is converged with the isobutene feeding pipeline, the mother liquor external circulation pipeline and the acrylonitrile backflow pipeline to be connected with an isobutene feeding port, and the other branch is converged with the sulfuric acid feeding pipeline, the mother liquor external circulation pipeline and the acrylonitrile backflow pipeline to be connected with a sulfuric acid feeding port. According to the invention, the production efficiency is improved, and the yield and purity of the product are higher.

The invention discloses a salt-resistant water-absorbent resin preparation method, which comprises: (1) uniformly mixing acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid in water, and partially neutralizing with a sodium hydroxide solution in an ice-water bath to obtain a mixed solution, the monomer mass ratio of the acrylic acid to the 2-acrylamido-2-methylpropanesulfonic acid being 1: 0.2-0.4, and the neutralization degree being 60-80%; (2) sequentially adding acrylamide, an initiator, a cross-linking agent and dextrin into the mixed solution obtained in the step (1), uniformly mixing to obtain a to-be-polymerized solution, and reacting the to-be-polymerized solution at 70-100 DEG C for 20-40 minutes; and (3) crushing the product obtained in the step (2), and drying to obtain the salt-resistant water-absorbent resin. The preparation method disclosed by the invention is simple, and meanwhile, the composite material still has better water absorption under high salt concentration, and can be better applied to the fields of food, chemical industry, medicine and the like.

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.