1250 results about "Polyacrylamide" patented technology

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 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 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 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 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 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 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 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.

The invention discloses an advanced treatment method of tungsten beneficiation wastewater, which is characterized in that a composite flocculant is adopted to flocculate the tungsten beneficiation wastewater, and the composite flocculant is mainly composed of cationic polyacrylamide, a flocculant A and lignocellulose, the flocculant A comprises at least one of polyferric sulfate, polyaluminum chloride, polyaluminum ferric chloride, polyaluminum ferric sulfate, ferric sulfate, ferrous sulfate and aluminum chloride. According to the advanced treatment method for the tungsten beneficiation wastewater, under the action of the composite flocculant, the cost of a treatment agent can be reduced to about 0.16-0.20 yuan / m < 3 >, the cost reduction amplitude is as high as 80% or above, the treatment time can be shortened to be within 10 min, the precipitation time is greatly shortened, meanwhile, suspended solids in the wastewater can be effectively removed, actual production requirements are met, and the method is suitable for industrial production. The method has the advantages of low treatment cost, high treatment efficiency, good removal effect, good adaptability and the like, can realize advanced treatment of the tungsten beneficiation wastewater, and is high in use value and good in application prospect.

This invention discloses a method for preparing a microcapsule-based photothermal self-healing anti-icing coating, belonging to the field of functional coating materials technology. The method includes: obtaining the core material and wall material composition parameters of the microcapsules, and collecting the polyacrylamide concentration and dopamine polymerization time; constructing a morphology-photothermal correlation model of the microcapsules to obtain the predicted photothermal conversion efficiency; performing multi-objective optimization on the core and wall material composition parameters with the target photothermal conversion efficiency as a constraint, and iteratively inverting to obtain the optimal microcapsule configuration; preparing primary microcapsules and composited with a dopamine photothermal modification layer on their surface to obtain a photothermal self-healing microcapsule additive; mixing the photothermal self-healing microcapsule additive with an epoxy resin-based coating at an adaptive mass ratio, coating and curing to obtain an anti-icing coating. This invention achieves accurate prediction of the photothermal conversion efficiency of microcapsules and intelligent optimization of composition parameters, obtaining an anti-icing coating with both high photothermal conversion efficiency and rapid self-healing capability.

The invention discloses a method for decalcifying by selectively precipitating magnesium ions in high-calcium and high-magnesium wastewater. The method comprises the following steps: pretreating the high-calcium and high-magnesium wastewater, filtering to remove impurities, and adjusting the pH value to obtain a pretreatment solution with the pH value of 9.5-10.5; adding phosphate into the pretreatment liquid to carry out auxiliary precipitation, so that Mg (OH) 2 crystals grow to obtain reaction slurry; introducing the reaction slurry into a sedimentation tank to settle Mg (OH) 2 crystals, and introducing supernate in the sedimentation tank into a decalcification tank; adding 100-200mg / L of polyaluminum chloride and 5-10mg / L of polyacrylamide into the decalcification tank, stirring and reacting, and introducing the reaction liquid into a decalcification sedimentation tank; carrying out solid-liquid separation in the decalcification sedimentation tank to obtain decalcified supernate; and carrying out deep decalcification on the decalcified supernate by using a selective ion exchange method. The method creates conditions for selective precipitation calcium removal and magnesium ion crystallization recovery of the high-calcium and high-magnesium wastewater.

The invention relates to the technical field of metallurgy, discloses a composite bentonite core material for metallurgical pellets as well as preparation and application of the composite bentonite core material, and aims to solve the technical bottlenecks that the TFe grade is low and the SiO2 content is high due to a large amount of bentonite in existing pellet production, and titanium-containing and high-sulfur fine iron powder pellets are easy to burst and insufficient in strength. The core material is formed by compounding 60% of corn gelatinized starch, 20% of sodium humate, 10% of lignosulfonate and 10% of macromolecular copolymer, and 2%-3% of borax or 2%-3% of polyacrylamide is added for titanium-containing iron fine powder for optimization; 3%-4% of potassium permanganate is added for optimization aiming at the high-sulfur iron fine powder. According to the composite bentonite, the compressive strength of finished product balls can be improved by 20%-30%, the ball cracking rate is reduced by 90% or above, the TFe grade is improved by 0.3%-1.3%, the multiple purposes of reducing the dosage, improving the grade and adapting to special fine powder are creatively achieved, and the composite bentonite has remarkable technical and economic values.

The invention discloses a photo-thermal hydrogel sponge with excellent salt resistance and a preparation method and application thereof, and belongs to the technical field of solar evaporators. The preparation method comprises the following steps: firstly, preparing melamine sponge (MS) with an asymmetric structure, filling a prepared polyacrylamide / graphene oxide (PAM / GO) hydrogel precursor solution and a prepared polyacrylamide / polyquaternium-7 (PAM / PQ7) hydrogel precursor solution into the melamine sponge by adopting a method of combining entering and injection, and preparing the polyacrylamide / polyquaternium-7 / PAM / PQ7 hydrogel composite material. The Janus structure photo-thermal hydrogel sponge with excellent salt resistance is obtained. The evaporator adopting the photo-thermal hydrogel sponge has an automatic salt resistance characteristic and an efficient salt resistance performance.

The invention relates to the technical field of preparation of high polymer materials and intelligent response materials, in particular to a preparation method of polyacrylamide for treatment. And constructing a quaternary polymerization system with acrylamide, a temperature-sensitive monomer and a zirconium-based metal organic framework-graphene quantum dot composite material. Magnetic response interpenetrating network gel is formed by induction of a photo-magnetic synergistic field, bacterial cellulose nanofibrils and a calcium silicate layered structure are introduced through a biomimetic mineralization technology, and the hierarchical porous carrier is prepared by combining a microfluidic crushing technology and a supercritical drying technology. Finally, through an intelligent regeneration mechanism of bimetal coordination activation and high-frequency magnetic field triggering, the material is endowed with multiple stimulation response characteristics, high adsorption capacity and in-situ regeneration capacity, and the mechanical strength and the salt resistance are remarkably improved through a pearl-layer-like micro-nano laminated structure. The method is suitable for industrial wastewater advanced treatment and emergency pollution repair scenes.

The application discloses a kind of binder, ceramic diaphragm and its secondary battery.The binder includes first polymer and second polymer, the first polymer and the second polymer are connected by chemical bond;The first polymer is polyacrylate polymer or SBR polymer containing first self-crosslinking structural unit, the Tg of the first polymer is ≤20 ℃, the second polymer is polyacrylic acid polymer or polyacrylamide polymer containing second self-crosslinking structural unit, the Tg of the second polymer is ≥80 ℃.The first polymer of low Tg is resistant to water and oil, but the heat resistance is generally, mainly plays the role of bonding, high Tg second polymer is resistant to oil and not resistant to water, mainly plays the role of heat resistance and improves electrolyte wettability, and by the interaction of first crosslinking structure and second crosslinking structure, so that binder simultaneously has excellent water and solvent resistance and heat resistance, and the affinity of electrolyte is better.

The invention belongs to the technical field of biological fouling protection, and particularly relates to an environment-friendly adhesive hydrogel antifouling coating which is prepared by the following steps: grafting a catechol group to an acryloyl compound with double bonds through acylation reaction to obtain a dopamine-acrylamide compound; the preparation method comprises the following steps: carrying out copolymerization reaction on an acrylamide derivative and a dopamine-acrylamide compound in a water environment to obtain an acrylamide derivative copolymer; and mixing the chitosan and the acrylamide derivative copolymer to obtain the environment-friendly adhesive hydrogel antifouling coating. According to the invention, polyacrylamide and catechol are introduced into a chitosan system at the same time to form a chitosan-polyacrylamide-catechol ternary synergistic network, and the chitosan-polyacrylamide-catechol ternary synergistic network has the effects of self-repairing, high toughness, strong adhesion and intelligent response.

The invention discloses a high-temperature-resistant oil-displacing agent for an oil field and a preparation method thereof, and relates to the technical field of oilfield exploitation. The prepared oil displacement agent for the oil field comprises the following raw materials in parts by weight: 15-25 parts of polyacrylamide, 1-5 parts of nano silicon dioxide, 25-35 parts of an enhanced surfactant and 40-60 parts of water. The oil-displacing agent is prepared by mixing and stirring the raw materials, and has excellent oil-displacing performance, low surface tension and excellent high-temperature resistance when being used in the oilfield exploitation process; compared with a traditional surfactant, due to the introduction of the enhanced surfactant, the high temperature resistance and the oil displacement efficiency of the oil displacement agent are improved.

The invention relates to the technical field of oil-displacing agents, in particular to a polyacrylamide-containing oil-displacing agent and a preparation method thereof.The polyacrylamide-containing oil-displacing agent is prepared from, by weight, 35-40% of functionalized polyacrylamide, 5-8% of loading filler, 2-3% of n-amyl alcohol, 5-7% of cyclohexane and the balance water; the polyacrylamide is subjected to functional modification, and the loading filler loaded with the zwitterionic surfactant is added, so that the oil-displacing agent can still keep a good synergistic effect in a complex high-temperature and high-salt environment, and a good oil-displacing characteristic is exerted.

The invention belongs to the technical field of crop genetic breeding, and relates to a molecular marker linked with a peanut branch number related gene locus, an identification method and application of the molecular marker. The primer pair is C9-F / R, and the sequence of the primer pair is as shown in SEQ ID NO. 1 and SEQ ID NO. 2; by designing an InDel marker C9 linked with the number of branches, the character of the number of branches of peanuts can be quickly distinguished by using a primer to amplify a target band and using polyacrylamide gel electrophoresis detection. The identification method is more accurate and convenient, has good repeatability, can efficiently distinguish the phenotype and genotype of an individual, shortens the experiment process, has the advantages of simple and feasible operation steps and the like, and saves expenditure. The method disclosed by the invention has important application value in the breeding work aspects of peanut branch number character related gene positioning, genotype typing, later cultivation of excellent peanut varieties and the like.

The invention belongs to the technical field of agricultural fertilizers, and discloses a preparation process and application of a medical stone double-effect organic fertilizer with soil improving and growth promoting functions, the medical stone double-effect organic fertilizer comprises the following components by weight: 20-40 parts of activated medical stone powder with a particle size of less than or equal to 0.1 mm, and activated by a citric acid solution; the decomposed organic material is prepared by mixing livestock and poultry manure and crop straw according to the mass ratio of 2: 1-4: 1 and performing aerobic composting fermentation through a compound microbial agent, and the water content is smaller than or equal to 30%; the microbial agent contains phosphate solubilizing bacteria, nitrogen-fixing bacteria and rhizosphere growth-promoting bacteria, and the effective viable count is greater than or equal to 2 * 10 CFU / g; the auxiliary material comprises bentonite, a polyacrylamide water-retaining agent and a pH (Potential of Hydrogen) regulator, and the proportion of the bentonite is greater than or equal to 30 percent. The adsorption-desorption performance of the medical stone is enhanced by activating the medical stone through citric acid, and a synergistic system of water retention, fertilizer supply and growth promotion is formed by combining decomposed organic materials and functional microorganisms. According to the fertilizer, the stability of a soil aggregate structure can be remarkably improved (increased by 15-20%), the yield increasing rate of crops reaches 20-30%, and 30% of chemical fertilizer dosage is reduced. The method is suitable for acid soil remediation, continuous cropping obstacle treatment and economic crop planting.

The invention relates to porous ceramic for a high-air-permeability semiconductor device as well as a preparation method and application of the porous ceramic, raw materials comprise 35-55 wt% of alumina powder and 10-55 wt% of a polymer microsphere pore-forming agent, and the polymer microsphere pore-forming agent comprises one or more of agarose, polylactic acid, polyacrylamide and organic silicon resin. The porous ceramic for the high-air-permeability semiconductor device, which is obtained by the preparation method provided by the invention, has relatively high porosity and air permeability, and also has relatively high mechanical strength and dielectric strength. According to the present invention, the gas volume flow rate is applied to the internal pore size characterization, and the high porosity and the high gas permeability can be achieved by accurately measuring the gas flow transmittance, accurately characterizing the pore size and the opening degree in the porous ceramic, and adjusting the particle size and the addition amount of the polymer microsphere pore forming agent; through the preparation process, the porosity and mechanical strength of the porous ceramic for the high-air-permeability semiconductor device can be balanced, meanwhile, high air permeability and high compressive strength are obtained, and the porous ceramic is particularly suitable for electrostatic chucks of different manufacture procedures.

The invention relates to the technical field of material conveying devices, in particular to a material conveying device for polyacrylamide preparation and an operation method.The material conveying device comprises a material conveying barrel, a spiral shaft is rotationally connected into the material conveying barrel, a feeding hopper is installed at the bottom end of the material conveying barrel, and the top of the material conveying barrel is sleeved with a protective cover; a plurality of heating pipes are fixedly arranged on the outer side of the conveying barrel in a sleeving mode, a movable frame is slidably connected between the protective cover and the conveying barrel, a screw rod is in threaded connection with the surface of the movable frame, one end of the screw rod is rotationally connected to the end of the protective cover, a plurality of mounting grooves are formed in the inner ring face of the movable frame, and knocking blocks are inserted into the mounting grooves; a spring is fixed between the knocking block and the mounting groove; the device has the beneficial effects that by arranging the moving frame, the knocking block, the spring, the heating pipe and other structures, in the reciprocating movement process of the moving frame, the knocking block periodically knocks the outer wall of the material conveying barrel through the elastic effect of the spring and blocking of the heating pipe, and therefore materials, close to the inner wall of the material conveying barrel, for preparing polyacrylamide are vibrated off.

A method of making paper and paperboard products, including absorbent structures, where the method includes mixing ultra-high molecular weight (“UHMW”) glyoxalated polyvinylamide (“GPVM”) adducts and high molecular weight (“HMW”) anionic polyacrylamide (“APAM”) with the furnish during stock preparation of a wet laid papermaking process.

The invention relates to the technical field of sewage treatment, in particular to an urban sewage treatment plant sludge deep dehydration conditioner and an application method thereof, and the urban sewage treatment plant sludge deep dehydration conditioner comprises the following raw materials: functional layered composite powder, cationic polyacrylamide, diatomite and sodium carbonate. After the functionalized layered composite powder and the bentonite are organically modified by the lauryl trimethyl ammonium bromide, the interlayer spacing is obviously increased, the hydrophobic property and the cation exchange capacity are excellent, negative charges on the surface of sludge colloid can be efficiently neutralized, a double-electrode-layer structure can be destroyed, and part of bound water can be released; ferric hydroxide deposited on the surface serves as amphoteric metal hydroxide, further compresses double electric layers through electric neutralization, forms an amorphous net structure and serves as a high-efficiency adsorption flocculation net to capture fine sludge particles; under the synergistic effect of the powder and cationic polyacrylamide, efficient removal of water combined with sludge and water in cells is achieved, and the dual purposes of deep dehydration and mud cake volume reduction are achieved.

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.

The invention relates to the technical field of geotechnical engineering, and discloses a method for inducing calcium carbonate to precipitate and bond loose sand grains through double polymers. Comprising the following steps: preparing a CaCl2-HPMA mixed solution from hydrolytic polymaleic anhydride and calcium chloride; the preparation method comprises the following steps: preparing a Na2CO3-APAM mixed solution from anionic polyacrylamide and sodium carbonate; after the CaCl2-HPMA mixed solution is injected into the loose sand body, the Na2CO3-APAM mixed solution with the same volume as the CaCl2-HPMA mixed solution is injected into the loose sand body; and the designed cementing liquid injection amount is completed for the loose sand body, and cementing is completed after calcium carbonate is completely reacted. The method is convenient to construct and use and low in time and material cost; the cemented sand body does not need to be dried and has higher unconfined compressive strength in a humid environment; the used cementing substance has good water solubility, the cementing liquid has good fluidity among sand grain pores, and the effective cementing range is large.

The invention relates to the technical field of oil and gas exploitation, and particularly discloses a temperature-resistant polyacrylamide temporary plugging agent as well as a preparation method and application thereof. According to the temperature-resistant polyacrylamide temporary plugging agent disclosed by the invention, the acrylamide, the functional monomer, the organic bifunctional group and metal complexing type compound cross-linking agent, the acrylic acid grafted silicon dioxide-graphene composite material, the polylactic acid and other components are scientifically proportioned, so that the temperature resistance, the salt resistance, the mechanical property and the degradation controllability of the product are synergistically improved, and the temperature-resistant polyacrylamide temporary plugging agent can be used at high temperature (gt); the stable plugging effect is maintained in a high-salinity stratum (120 DEG C, 120 DEG C), reservoir damage can be reduced through controllable degradation of polylactic acid, meanwhile, the preparation process is simple and convenient, industrialization is easy, the preparation method is suitable for the development requirements of deep, ultra-deep and offshore oil and gas reservoirs, and the application prospect is wide.