1628 results about "Polyacrylamide" patented technology

A method of making an absorbent structure including mixing ultra-high molecular weight (“UHMW”) glyoxalated polyvinylamide adducts (“GPVM”) and / or high molecular weight (“BMW”), glyoxalated polyacrylamide and / or high cationic charge glyoxalated polyacrylamide (“GPAM”) copolymers and high molecular weight (“BMW”) anionic polyacrylamide (“APAM”) with the furnish during stock preparation of a wet laid papermaking process.

The invention discloses a composite polyacrylamide flocculant based on a nano core-shell structure as well as a preparation method and application of the composite polyacrylamide flocculant. The composite polyacrylamide flocculant is a core-shell structure composite material which takes inorganic nanoparticles grafted with carbon-carbon double bonds on the surface as a core and takes a polyacrylamide copolymer as a shell; the polyacrylamide copolymer is prepared from the following components in parts by mass: 70 to 90 parts of acrylamide, 10 to 30 parts of functional monomer and 0.1 to 1.0 part of cross-linking agent. The basic conception of the flocculating agent provided by the invention is that the structural design of inorganic nano core-organic polymer shell is adopted, PAM molecular chains firmly grow on the surfaces of nano particles in a chemical grafting manner, high dispersion and functional synergy of nano units are realized, and the obtained product has the characteristics of high flocculation speed, dense floc, high removal efficiency and the like, and has a wide application prospect. The method is especially suitable for deep treatment of difficult-to-treat industrial wastewater such as oil-containing wastewater, dye wastewater and heavy metal wastewater.

The invention provides a diaphragm and a preparation method thereof and a lithium ion battery, the diaphragm comprises a base membrane layer and a composite functional layer, the composite functional layer comprises hydrophobic SiO2 aerogel modified by a hydrophobic agent, a conductive ion polymer and a solid electrolyte, and the composite functional layer respectively accounts for 3-12wt%, 0.5-1.0 wt% and 0.5-1.5 wt% of the total mass of the diaphragm; the hydrophobic agent comprises trimethylchlorosilane, hexamethyldisilazane, perfluorooctyltriethoxysilane, polyvinylidene fluoride, polydimethylsiloxane and the like, the conductive ionic polymer comprises polyvinylpyrrolidone, lithium polymethacrylate, lithium polystyrene sulfonate, polyacrylamide and the like, and the solid electrolyte comprises lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide and the like. The wettability is improved by the high porosity of the hydrophobic SiO2 aerogel, the stability and strong conductivity of a physical conductive network of the solid electrolyte and the ion affinity and amphoteric binding capacity of the conductive ion polymer are optimized, the electrochemical performance and thermal stability of the interface are optimized, and comprehensive optimization of the thermal-electric-interface performance of the diaphragm is realized through combination.

The application discloses a preparation method of a resistance / capacitance dual-response MXene-based hydrogel flexible sensor, and the hydrogel flexible sensor is prepared by combining a microstructure hydrogel prepared from polyacrylamide, gelatin and MXene with an interdigital electrode. The hydrogel flexible sensor can simultaneously detect resistance response signals and capacitance response signals. The detected resistance and capacitance signals are complementary to each other, the single response signal mode of the flexible sensor is widened, the mutual calibration of the same group of data is realized, and the detection precision of the flexible sensor is improved. The MXene-based hydrogel flexible sensor is applied to the detection of human biological signals, for example, carotid artery pulse detection and radial artery pulse detection.

The invention relates to the technical field of molecular markers, in particular to an Indel molecular marker related to yellow leaves of a melon seedling growing point and application of the Indel molecular marker. The invention explores a key candidate gene MELO3C016136 for controlling the leaf color of the growth point of the muskmelon seedling, and develops an Indel molecular marker ygp2 for identifying the leaf color change of the growth point of the muskmelon seedling based on the key candidate gene MELO3C016136. The molecular marker ygp2 can be used for identifying the leaf color change character of the growth point of the muskmelon seedling, only one-time PCR amplification and polyacrylamide gel electrophoresis need to be carried out on the DNA of the plant to be detected, the identification result is reliable, the genotype of the target plant can be simply and conveniently identified, and the genotype identification result is completely consistent with the leaf color phenotype of the growth point of the seedling; important technical support is provided for creating new muskmelon germplasm with yellow seedling growing point leaves.

The invention discloses a copper surface micro-etching coarsening solution for a fine circuit as well as a preparation method and application of the copper surface micro-etching coarsening solution, and relates to the technical field of printed circuit board manufacturing. The copper surface micro-etching coarsening solution for the fine circuit is prepared from, by mass concentration, 60 g / L to 100 g / L of sulfuric acid, 40 g / L to 60 g / L of hydrogen peroxide, 0.5 g / L to 2 g / L of zinc sulfate, 10 g / L to 30 g / L of copper ions, 0.5 g / L to 1 g / L of pyridine heterocycle-containing Schiff base, 10 g / L to 100 g / L of ethyl alcohol, 1 g / L to 3 g / L of 2-mercaptobenzothiazole, 1 g / L to 5 g / L of methionine and 1 g / L to 5 g / L of polyacrylamide. According to the copper surface micro-etching coarsening solution, the 2-mercaptobenzothiazole and the methionine in the copper surface micro-etching coarsening solution can enable the copper surface to form a honeycomb structure under the low micro-etching amount, the zinc sulfate and the pyridine heterocyclic ring-containing Schiff base can form a composite film layer with copper ions on the surface of the honeycomb structure, and the interlayer binding force is improved.

The invention discloses a low-temperature-resistant polyacrylamide flocculant suitable for a low-temperature water body and a preparation method of the low-temperature-resistant polyacrylamide flocculant. The flocculant is prepared from the following raw materials in parts by weight: 60 to 85 parts of acrylamide (AM), 15 to 40 parts of low-temperature-resistant functional monomer 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 0.5 to 5 parts of hydrophobic modified monomer, 0.1 to 1.0 part of molecular chain regulator, 0.01 to 0.1 part of initiator, 120 to 200 parts of deionized water and 1 to 5 parts of post-added antifreezing agent. The product is prepared by an aqueous solution polymerization method. According to the invention, by introducing the rigid sulfonic monomer and the functional monomer with large steric hindrance and compounding the specific antifreezing agent, the extensibility and diffusion performance of a polymer molecular chain in low-temperature (less than or equal to 10 DEG C) water are remarkably improved, so that large and dense flocs can be quickly formed under the low-temperature condition, and an excellent flocculating settling effect is kept.

The invention belongs to the technical field of building materials, and particularly relates to a micro-expansion anti-cracking waterproof composite deep groove filler and a preparation method thereof. The micro-bulking anti-cracking waterproof composite deep groove filler provided by the invention comprises cement, gypsum, mineral powder, nano silicon oxide, coarse aggregate, fine aggregate, modified fibers, an expanding agent, a polycarboxylate superplasticizer and water. According to the invention, polyacrylamide, calcium sulphoaluminate and magnesium oxide are adopted to jointly form an expanding agent, and early-stage-late-stage full-period shrinkage compensation is jointly formed in a concrete hydration process, so that the density of the concrete is effectively improved, and the waterproof performance of the concrete is further improved; according to the invention, sodium dodecyl benzene sulfonate and propylene glycol block polyether are adopted to carry out compound modification on graphene oxide, and gamma-aminopropyltriethoxysilane is connected to the surface of basalt fiber, so that the bonding strength of basalt fiber and a cement matrix and the compactness of the cement matrix are improved, and the waterproof and anti-cracking properties of concrete are further improved.

The invention discloses a multi-network anti-freezing hydrogel electrolyte, a preparation method thereof and application of the multi-network anti-freezing hydrogel electrolyte in an electrochemical device. The hydrogel is prepared by using polyvinyl alcohol (PVA) and polyacrylamide (PAM) to form a basic network skeleton, introducing phytic acid, ethylene glycol and lithium / zinc bimetal salt (Li2SO4 / ZnSO4), and carrying out thermal initiation polymerization and freeze thawing. The hydrogel prepared by the invention has a multiple physical cross-linked network formed by polymer molecular chain entanglement, hydrogen-bond interaction among functional groups and metal coordinate bonds constructed between phosphate groups and divalent metal ions, so that the hydrogel electrolyte has excellent mechanical properties. Due to introduction of ethylene glycol, formation of ice crystals is effectively inhibited, and the hydrogel is endowed with excellent anti-freezing performance; the high-concentration Li < + > and Zn < 2 + > ensure the high ionic conductivity. The supercapacitor assembled by using the hydrogel electrolyte shows relatively high specific capacitance and good capacitance retention rate under bending and freezing conditions, and has good electrochemical properties and safety performance.

The invention relates to a super-flexible supercapacitor with a multi-layer seamless interlocking interface and a preparation method of the super-flexible supercapacitor. The super-flexible supercapacitor takes a carbon nanotube or a composite film thereof as an electrode; and polyanion gel (polyacrylamide / polyacrylic acid / poly (3-sulfonic acid propyl methyl acrylic acid potassium salt) and polycation gel (polyacrylamide / polyacrylic acid / poly (methacryloyloxyethyl trimethyl ammonium chloride) are used as the double-layer heterogeneous electrolyte. A covalent connection electrode / electrolyte interface is constructed through anchoring interface polymerization, and double-layer gel electrolyte with electrostatic attraction and mutual entanglement is constructed through in-situ polymerization, so that the super-flexible supercapacitor with a multi-layer seamless interlocking interface is realized. Compared with the prior art, the super capacitor has super-strong interface toughness and interface adhesion, can resist mechanical deformation including bending, folding, twisting, winding, extruding, knotting and the like, the capacity retention ratio is greater than 95% after the super capacitor is folded for hundreds of thousands of times, and the capacity retention ratio is greater than 89% after the super capacitor is circularly charged and discharged for hundreds of thousands of times.

The invention discloses a seed pelleting formula for improving salt tolerance of suaeda salsa in coastal saline-alkali soil and a processing method, the pelleting formula comprises 348-492 parts of a filler, 348-492 parts of a binder, 348-492 parts of a water-retaining agent and 348-492 parts of a biological stimulant, and the filler comprises attapulgite, talcum powder and vermiculite; the binder is 73-89 parts and comprises sodium carboxymethyl cellulose, polyvinyl alcohol and starch; the water-retaining agent accounts for 30 to 42 parts, and the water-retaining agent is polyacrylamide; the biological stimulant is prepared from the following components in parts by weight: 20-78 parts of yeast metabolite, potassium fulvate, seaweed essence, rhamnolipid and a microbial agent; the processing method comprises the steps of seed selection, raw material preparation, layered coating, low-temperature drying, selection and sieving, and polishing and shaping. According to the invention, a layered coating process is adopted to break through a traditional single mixed coating mode, an isolation breathable microenvironment is firstly constructed by the filling layer, then growth-promoting stress-resistant nutrient substances are injected by the active layer, and finally, the shaping layer is used for locking and shaping and strengthening protection, so that the seeding performance, salt tolerance, germination activity and seedling stress resistance of the pellets are remarkably improved.

The invention relates to the technical field of grouting materials, in particular to a dynamic water environment anti-dispersion micro-expansion grouting material and a preparation method thereof. A component A of the grouting material mainly comprises the following raw materials in parts by weight: 120-160 parts of a gel material with volcanic ash characteristics, 3-5 parts of a retarder, 10-15 parts of magnesium oxide, 0.5-2 parts of citric acid, 5-8 parts of aluminum sulfate, 1-2 parts of sodium fluoride, 0.5-1 part of gelatin and 70-100 parts of water; the component B mainly comprises the following raw materials in parts by weight: 4-8 parts of polyacrylamide, 5-10 parts of polyacrylic acid derivative salt, 1-2 parts of alcohol polysaccharide, 40-100 parts of water glass and 30-50 parts of water; magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the component A are prepared into core-shell anti-dispersion particles in advance; the problems that a traditional cement grouting material is poor in anti-scouring capacity and anti-dispersing capacity, low in retention rate, poor in stone durability and the like can be solved.

The invention discloses a gel composition for improving compatibility and gelling speed of a tooth whitening product. The gel composition comprises whitening gel and a catalyst, respectively filling the whitening glue and the catalyst into a double-barrel injector; when the tooth whitening gel is used, the push rod is pushed, the whitening gel and the catalyst in the double-tube barrel are squeezed out at the same time and mixed at the mixing head to form the tooth whitening gel capable of being smeared on the tooth surface of a patient, and the pH value of the tooth whitening gel is 7.5-10.0. The catalyst comprises potassium salt or strontium salt, sodium fluoride, glycerol, cross-linked polyacrylamide gels, strong alkaline substances, essence and water; the whitening gel comprises a hydrogen peroxide solution, a cross-linked polyacrylamide gel, glycerin, essence and water. The cross-linked polyacrylamide gel is adopted, the gel is resistant to strong-alkalinity and high-pH environment and various inorganic salt ions such as fluoride, sylvite or strontium salt, the prepared gel is stable in form and good in compatibility, the gel preparation process is simple, the gel is rapidly swelled when encountering water and does not huddle, and long-time standing is not needed.

The invention relates to the technical field of industrial process control and data analysis, in particular to a polyacrylamide production process monitoring data analysis system based on reinforcement learning, which comprises a data acquisition step: acquiring process data at a first frequency, and receiving quality data at a second frequency; a strategy generation step: outputting an action by using a neural network, and calculating an instant agency reward by using an agency model; an asynchronous experience playback step: constructing a nonlinear storage structure, and mapping lagging quality data back to historical process data fragments to complete a causal closed loop; a model updating step: calculating a delay correction reward, and updating network parameters based on the mixed reward; according to the invention, decoupling of real-time decision and delay calibration is realized through a dual-time scale architecture, and the response capability and high-precision control of a test vacuum period are ensured.

The invention discloses a mechanically interlocked isohydrocarbon-like structure hydrogel and a preparation method thereof, and belongs to the technical field of hydrogel sensing. The preparation method of the mechanically-interlocked isohydrocarbon-like structure hydrogel comprises the following steps: firstly, preparing a carbon nano network solution by using hydroquinone; and then mixing the carbon nano network solution, acrylamide, water, a cross-linking agent and a photoinitiator, and treating under ultraviolet irradiation to obtain the hydrogel. The preparation method comprises the following steps: introducing a three-dimensional carbon nano network, blending the three-dimensional carbon nano network with an acrylamide monomer, and carrying out in-situ free radical polymerization to construct the mechanical interlocking isohydrocarbon-like structure hydrogel. The carbon nano network provides a continuous porous framework, a polyacrylamide chain segment is embedded into pores of the carbon nano network in the polymerization process, and a stable isohydrocarbon-like structure is formed through physical winding, space nesting and mechanical interlocking. The prepared hydrogel has excellent mechanical property, adhesion property and strain response capability, and provides a reliable and economical material basis for a flexible strain sensing function.

The invention belongs to the technical field of channeling prevention in oilfield exploitation, and discloses a non-hydrocarbon gas assisted thermal recovery'dual 'channeling prevention process, which is characterized in that a'high-strength temporary plugging agent' system is injected at the front end, and the system is prepared from the following components in percentage by mass: 0.6 to 0.8 percent of gelling agent, 0.1 to 0.2 percent of cross-linking agent, 0.05 to 0.2 percent of retardant and the balance of water; a high-strength plugging agent system is injected into the rear end, and the system is prepared from, by mass, 0.4%-0.6% of a curing agent, 5%-6% of a high-temperature-resistant plugging agent, 0.3%-0.5% of a foaming agent, 0.1%-0.2% of polyacrylamide and the balance water. The method is reasonable in design and reliable in basis, has the functions of profile control and gas channeling inhibition, gas injection quantity increase, steam channeling influence reduction and the like compared with a conventional independent non-hydrocarbon gas assisted steam huff and puff technology, and provides an effective method for solving the double channeling problems of gas channeling and steam channeling in non-hydrocarbon gas assisted steam huff and puff.

This invention provides a lithium slag-free autoclaved aerated concrete and its preparation method. The lithium slag-free autoclaved aerated concrete is made from the following raw materials in parts by weight: 75-90 parts lithium slag, 10-25 parts cement, 20-35 parts water glass solution, 0.5-0.9 parts physical foaming agent, 0.1-0.4 parts water-reducing agent, 0.02-0.2 parts polyacrylamide, and an appropriate amount of water. The physical foaming agent, water glass solution, and polyacrylamide are mixed to prepare foam, which is then added to a slurry solution obtained by mixing the other raw materials. The mixture is stirred evenly to obtain a finished slurry. The finished slurry is then cast, molded, and cured to obtain the lithium slag-free autoclaved aerated concrete. The water-to-solid ratio of the finished slurry is 0.3-0.35. This method can achieve efficient utilization of lithium slag and exhibits good mechanical properties.

A dust suppression material with dual network reinforced structure and its preparation method is provided, which relates to the field of dust control technology. The material comprises by weight: 0.1-0.5 parts of sesbania gum, 0.1-0.9 parts of polyacrylamide, 0.1-0.5 parts of carboxymethyl cellulose, 0.06-0.14 parts of crosslinking agent, 0.11-0.19 parts of oxidant, 0.1-0.3 parts of water retaining agent, 0.2-1 parts of wetting agent, and the balance is distilled water. The dust suppressant with dual network reinforced structure produced by the present disclosure can effectively improve the hydrophilicity and adhesion of dust, form a dense protective film on the surface of dust, meet the requirements of dust suppressant adhesion and wettability for underground coal mining operations and outdoor coal storage filed, and will not cause secondary pollution to the environment.

The invention discloses an engineering residue soil improvement matrix and application thereof, the engineering residue soil improvement matrix comprises a base layer and a planting layer, the base layer comprises 50-70 wt% of engineering residue soil, 10-15 wt% of humus soil, 6-8 wt% of a fiber material, 3-5 wt% of a slow release fertilizer, 1-2 wt% of sulfur powder, 2-4 wt% of sodium polyacrylate, 3-5 wt% of polyacrylamide, 2-4 wt% of sodium hydroxide, and 3-4 wt% of a straw decomposition agent; the planting layer comprises 25 to 50 wt% of engineering residue soil, 20 to 30 wt% of peat soil, 4 to 6 wt% of compost, 6 to 8 wt% of a fiber material, 3 to 5 wt% of a slow release fertilizer, 1 to 2 wt% of sodium polyacrylate, 1 to 2 wt% of sodium hydroxide, 3 to 4 wt% of straw biochar, 3 to 4 wt% of a straw decomposition agent, 2 to 4 wt% of zeolite, 3 to 5 wt% of desulfurized gypsum, 1 to 2 wt% of nitrogen-fixing bacteria and 1.5 to 3 wt% of plant seeds. On the basis of a thick-layer base material spraying slope protection technology, spray-seeding materials are improved, waste muck is recycled, and land occupation and water and soil pollution caused by traditional muck landfill or stacking are avoided.

The invention relates to the technical field of refractory materials, in particular to a regenerated magnesia wet gunning mix and a preparation method thereof. The regenerated magnesia wet gunning mix is prepared from the following raw materials: 60-75 wt% of regenerated magnesia; 8 wt%-18 wt% of sintered magnesia fine powder; 9 wt%-14 wt% of a binding agent; 4 wt%-8 wt% of a functional additive; the sum of the dosages of all the components is 100%. The binding agent comprises a sol aqueous solution, a polyphosphate complexing agent and cement; the functional additive comprises an aqueous solution of a cationic polyacrylamide flocculant, a nano material and explosion-proof fibers. The comprehensive performance of the regenerated magnesia wet gunning mix provided by the invention is excellent.

The invention relates to the field of hydrophilic thermosensitive resin, in particular to hydrophilic thermosensitive resin as well as a preparation method and application thereof, and aims to solve the problems that an existing thermosensitive material is insufficient in hydrophilicity, an existing hydrophilic material is insufficient in thermosensitive performance, and a resin material cannot give consideration to both the hydrophilic material and the hydrophilic material at the same time. According to the resin, an imidazole structure is introduced into polyacrylamide and grafted into PNIPAM to form an amido bond, the hydrophilic performance of the PNIPAM is improved, ethyl cellulose is grafted onto amino-treated silicon dioxide to form an amido bond, and the hydrophilic performance of the resin is improved together with modified polyacrylamide blended PNIPAM; when the resin is applied to a specific medium or environment, the resin can show a corresponding response behavior on absorption or release of moisture according to the change of environment temperature, realizes effective regulation and control and induction on temperature and humidity, and can be applied to temperature-sensitive medical treatment, electronic packaging and other emerging technical fields.

The invention belongs to the technical field of fertilizer synergists, and particularly relates to a polysaccharide yeast chelating synergist suitable for fertilizers and application of the polysaccharide yeast chelating synergist. The polysaccharide yeast chelating synergist suitable for the fertilizer is prepared from the following raw materials in parts by weight: 10 to 25 parts of polyglutamic acid, 1 to 5 parts of zymosan, 8 to 15 parts of modified polyacrylamide, 8 to 12 parts of sodium humate, 1 to 5 parts of trace elements, 5 to 10 parts of filler and 6 to 10 parts of organic acid. By adding the modified polyacrylamide, the zymosan, the filler and other components into the polyglutamic acid, the fertilizer retention capacity and slow release performance of the fertilizer are effectively improved, and the yield and quality of crops are further improved.

The invention discloses a method for extracting copper fine powder by flotation of copper-containing ore, which belongs to the technical field of mineral processing, and comprises the following steps: after copper-containing raw ore is crushed, ground and classified by a cyclone, overflow enters flotation, and settled sand is returned for regrinding; sodium carbonate is added into graded overflow to adjust the pH, a sodium hexametaphosphate-polyacrylamide composite dispersant is added, and copper sulfate is added and stirred after low-temperature microwave heating; gradient flotation is conducted, specifically, copper sulfide is roughly selected, the pH is adjusted, an amino-sulfonic acid group synergistic modified layered double metal hydroxide / cobalt ferrite composite collecting agent is added, and rough concentrate 1 is obtained through high-frequency pulse air inflation flotation; copper oxide roughing is conducted, clear water is supplemented to adjust the pH, and a collecting agent is supplemented to obtain rough concentrate 2; scavenging is performed for three times, a collecting agent is added for flotation, and concentrate returns to the previous stage; the rough concentrates are combined, and magnetic impurities are removed through high-gradient magnetic separation to obtain magnetic concentrates; and carrying out microbiological leaching on tailings to recover copper. The composite collecting agent is prepared through layered double hydroxide carrier synthesis, amino modification, sulfonic acid group grafting and cobalt ferrite anchoring.

The application belongs to the technical field of preparation of carbon aerogel materials, and particularly relates to a nitrogen-doped carbon aerogel and a preparation method and application thereof. A carbon aerogel with a three-dimensionally interconnected microporous structure is prepared by using two precursors with low cost and rich in nitrogen content, namely acrylamide and aniline. Firstly, a three-dimensionally interconnected polyacrylamide medium with high absorbability is prepared; then, by virtue of the high absorbability, the reaction solution of aniline is fully absorbed in a low-temperature state, and the aniline is uniformly dispersed and orderly polymerized under a freezing condition, so that the problem of agglomeration of traditional polyaniline preparation and difficulty in dispersion are solved; finally, an activating agent is used to activate and pore-form the aerogel. The carbon aerogel has high nitrogen content, rich in a large number of basic active sites and a three-dimensionally interconnected microporous structure, and thus the CO2 adsorption capacity is significantly improved.

The invention provides a functional composite suspended biological carrier and a preparation and application method thereof. The functional composite suspended biological carrier comprises a main base material and functional components, the main body base material is polyethylene or polypropylene, and the functional component comprises the following substances in parts by mass: 3.0 parts of polyquaternium-10 or cationic polyacrylamide, 1.5 parts of molybdenum disulfide, 2.5 parts of vinyl acetate or acrylate, 2.0 parts of nano silicon dioxide, 2-3 parts of talcum powder, 0.5 part of a silane coupling agent and 0.5 part of polyethylene wax; the total proportion of inorganic components in the carrier is less than or equal to 12%; the cross section of the carrier is a 19-hole honeycomb hollow cylinder, the diameter of the formed cylinder is 25 mm, the height of the formed cylinder is 10 mm, and the density of the carrier is 0.95-1.00 g / cm; according to the invention, the state of charge on the surface of the carrier is adjusted through the positive electricity polymer PQAS-10, the affinity with negatively charged microorganisms is enhanced, the biofilm culturing period is obviously shortened, and by introducing molybdenum disulfide and a composite conductive structure thereof, a surface micro-conductive network is established, and the microbial metabolism efficiency under aerobic and facultative conditions is improved.

The invention discloses a preparation method of a coal slime water treatment flocculant, and relates to the technical field of wastewater treatment.The preparation method comprises the following steps that modified polyacrylamide, modified chitosan, polymeric chloride and water are mixed and stirred by weight, and the coal slime water treatment flocculant is obtained; the modified polyacrylamide is obtained by physically blending a nano cellulose based TiO2 nano composite material and polyacrylamide; the modified chitosan is obtained by grafting N-benzyl-2-(methylacryloyloxy)-N, N-dimethylethane-1-ammonium chloride after SiO2 and chitosan are hybridized through a silane coupling agent, and the modified chitosan is obtained by grafting N-benzyl-2-(methylacryloyloxy)-N, N-dimethylethane-1-ammonium chloride; through the synergistic interaction of the inorganic coagulant, the natural modified polymer and the nano composite material, multiple targets of efficient flocculation, broad-spectrum purification, environment friendliness and cost optimization in slime water treatment are achieved, and the composite material is particularly suitable for high-turbidity and high-organic-matter-load complex slime water quality or heavy metal-containing complex slime water quality and has remarkable industrial application potential.

The invention relates to the field of fracturing fluids, in particular to a modified polyacrylamide polymer fracturing fluid and a preparation method thereof, which are used for solving the problems that the existing polyacrylamide polymer fracturing fluid is poor in temperature resistance and salt resistance and is difficult to adapt to fracturing operation requirements in high-temperature and high-salt environments. According to the fracturing fluid, the modified polyacrylamide dry powder thickening agent is adopted as a core component, so that the performance of the fracturing fluid in a high-temperature and high-salinity environment is improved, the thermal stability of the fracturing fluid at a high temperature and the chemical stability of the fracturing fluid at a high salt concentration are remarkably enhanced, and relatively high viscosity and shear stability can be kept in the high-temperature and high-salinity environment; therefore, effective sand carrying, collapse prevention and crack expansion in fracturing operation are guaranteed, the oil well fracturing effect and efficiency are remarkably improved, effective development of oil and gas resources is achieved, and the method can be widely applied to oil and gas exploitation of deep and complex geological structures, the exploitation efficiency is improved, and economic benefits are obtained.

The invention discloses a lithium-magnesium separation membrane based on pore size screening-coordination synergy as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The surface of a porous ultrafiltration membrane is used as a water phase-oil phase interface, and polyamine monomers in a diamine / lithium ion selective coordination molecule / surfactant mixed aqueous solution and polyacyl chloride monomers in an organic phase are subjected to interfacial polymerization reaction at the interface, so that a polyamide separation layer is formed; the surfactant regulates diffusion and distribution of amine monomers to form a narrow-aperture polyamide network; wherein lithium ion selective coordination molecules are embedded in the narrow-aperture polyamide network under the action of hydrogen bonds and the like to form a lithium ion selective channel, so that the lithium-magnesium separation membrane based on aperture screening-coordination synergy is obtained. The retention rate of the lithium-magnesium separation membrane to a 1000ppm MgCl2 aqueous solution is as high as 95% or above, and the retention rate of the lithium-magnesium separation membrane to a 1000ppm LiCl aqueous solution is as low as 50% or below.

The invention discloses high molecular weight polyacrylamide for treating high-salinity sludge, which is prepared from the following components in parts by weight: 110 to 140 parts of acrylamide, 30 to 40 parts of acryloyloxyethyl trimethyl ammonium chloride, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 8 to 10 parts of urea, 0.05 part of EDTA-5Na (Ethylene Diamine Tetraacetic Acid), 5 parts of N-vinyl pyrrolidone and 0.04 part of oxidation-reduction initiator. 0.05 part of a cationic free radical initiator, and 300-320 parts of deionized water. The invention also provides a preparation method of the high molecular weight polyacrylamide. According to the high-molecular-weight polyacrylamide disclosed by the invention, the synergistic salt resistance of cations and sulfonic acid groups is realized through unique molecular structure design, excellent stability and activity are still kept in a salt-containing complex water body, and efficient and thorough solid-liquid separation and dehydration purification on high-salt oil-containing sludge can be realized.

The invention provides a preparation method of ultrahigh-purity copper. The preparation method comprises the following steps: providing a first anode, a first cathode and an electrolyte; the electrolyte comprises the following components: a purified copper salt solution, inorganic acid, an oxidizing agent and an additive, the purified copper salt solution comprises purified copper salt and water, the purified copper salt comprises copper sulfate and copper nitrate, and the molar ratio of nitrate to sulfate in the purified copper salt solution is (1.5-9): 1; the additive comprises any one or a combination of at least two of an alcohol compound, polyacrylamide or a tetrazole compound; and the first cathode and the first anode are immersed in the electrolyte for electrochemical deposition, and the ultra-high-purity copper is obtained. The electrolyte composed of the purified copper salt solution, the inorganic acid, the oxidizing agent and the additive is adopted, the proportion of nitrate radicals to sulfate radicals in the purified copper salt solution is controlled, the impurity content of the sulfur element and the silver element in the electrolyte can be controlled, and preparation of the ultra-pure electrolytic copper is achieved.