49 results about "Dimethyldiazene" patented technology

The invention relates to the technical field of oilfield chemistry, and discloses a graft modified cellulose filtrate reducer and a preparation method thereof.The preparation method comprises the following steps that modified hydroxyethyl cellulose, 2-acrylamide-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, alkenylated cardanol and N, N '-methylene bisacrylamide are added into deionized water, stirring is conducted, and a mixture is obtained; the preparation method comprises the following steps: adding cellulose into a reaction kettle, stirring for 10-15 minutes at the temperature of 40-60 DEG C at the speed of 300-400 rpm, dropwise adding ammonium persulfate and sodium hydrogen sulfite into a system, and continuously reacting for 4-6 hours to obtain the grafted modified cellulose filtrate reducer. The filtrate reducer disclosed by the invention has good high temperature resistance and salt resistance.

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 belongs to the technical field of emulsion polymerization, and particularly discloses super-water-resistant cationic latex and a preparation method thereof. The invention discloses super water-resistant cationic latex. Comprising the following raw materials: deionized water, a hydrochloric acid solution, an emulsifier QT-03, an N-tallow trimethylene diamine quick-cracking emulsifier, a dimethyl diallyl ammonium chloride solution, a methacryloyloxyethyl trimethyl ammonium chloride solution, styrene, methyl methacrylate, butyl acrylate, diacetone acrylamide, azobis (isobutylamidine hydrochloride) and a defoaming agent. And adipic acid dihydrazide. According to the invention, a diacetone acrylamide-oxalic acid dihydrazide DAAM-ADH ketone hydrazine crosslinking system is utilized, and an oleamide QT-03 emulsifier is adopted, so that the green and environment-friendly room-temperature self-crosslinking type super-water-resistant cationic latex is synthesized.

The invention belongs to the technical field of textile dyeing and finishing production, and discloses a cationic color fixing agent and a preparation method thereof.The cationic color fixing agent is obtained by conducting self-polymerization on dimethyl diallyl ammonium chloride and then conducting cross-linking, and in the cross-linking process, the mass ratio of a dimethyl diallyl ammonium chloride self-polymer to a cross-linking agent is 70-80: 1-4; the cross-linking agent is selected from at least one of pentaerythritol triallyl ether, methyl triallyl silane, tetraallyl silane and triallyl (phenyl) silane, the molecular weight of the cationic monomer is firstly increased by synthesizing the self-polymer, and then cross-linking is performed, so that the gel risk is reduced.

The application belongs to the technical field of organic synthesis, and specifically discloses a preparation method of dimethyl diallyl ammonium chloride, which comprises the following steps: under the condition that water exists, dimethylamine, an alkaline carrier and allyl chloride are mixed and subjected to a contact reaction to obtain a crude tertiary amine; the alkaline carrier comprises a carrier body and a carbonic acid alkali metal salt loaded on the carrier body; under the condition that an organic solvent exists, the crude tertiary amine and allyl chloride are mixed and subjected to a contact reaction. The method can effectively reduce the hydrolysis of allyl chloride and the generation of dimethylamine hydrochloride in the reaction process, the dimethyl diallyl ammonium chloride product contains almost no other hydrochloride impurities, and the reaction efficiency, the yield and the purity of the dimethyl diallyl ammonium chloride are improved.

The application discloses a kind of photovoltaic glass self-cleaning nano coating and its processing method, for crosslinking grafting on the surface of photovoltaic glass to control water contact angle less than 0.3 °, it is related to photovoltaic maintenance technical field, the photovoltaic glass self-cleaning nano coating includes mesoporous silica, epoxy group polyether, dimethyl diallyl ammonium chloride, enamine, ethyl chloroacetate, crosslinking agent, initiator, silane coupling agent.The application has the photovoltaic glass self-cleaning nano coating of water contact angle less than 0.3 ° formed on the surface of photovoltaic glass, so that water film spread on the surface of photovoltaic glass is separated from the photovoltaic glass self-cleaning nano coating by contaminant, and then the effect of removing contaminant is carried out by using gravity and / or wind power to drive water film to move.

The invention provides a high-transmittance coating liquid as well as a preparation method and application thereof. The high-transmittance coating liquid is prepared from monomers, an initiator and silica sol, the monomers comprise basic monomers and cationic monomers, the basic monomers comprise at least two of butyl acrylate, styrene, methyl methacrylate, acrylic acid, hydroxyethyl methylacrylate and hydroxyethyl acrylate, and the cationic monomers comprise at least two of butyl acrylate, styrene, methyl methacrylate, acrylic acid, hydroxyethyl methylacrylate and hydroxyethyl acrylate. The cationic monomer comprises at least one of methacryloyloxyethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride and methacrylamidopropyl trimethyl ammonium chloride. Through the synergistic effect of the basic monomer and the cationic monomer, the light transmittance gain of the photovoltaic glass is greater than or equal to 2.4%, the pencil hardness of a film layer is greater than or equal to 3H (the pencil hardness can reach 4H or above after a binding phase is introduced), the adhesive force is less than or equal to level 1, and the contradiction of dual performance requirements is solved. The invention further provides a preparation method and application of the high-transmittance coating liquid.

This invention provides a clay stabilizer and its preparation method. First, a low molecular weight polymer is obtained by polymerizing acrylate, acrylamide, and dimethyl diallyl ammonium chloride in an aqueous solution. Then, an amidation reaction is carried out with enamine or alkyl diamine to obtain the clay stabilizer. This clay stabilizer has the advantages of good anti-swelling effect and long-lasting effect, effectively preventing clay particle migration, good temperature resistance, not increasing formation water salinity, and increasing formation permeability. The anti-swelling rate is ≥95%, the anti-swelling rate after aging at 350℃ is ≥90%, the water washing resistance rate is ≥97%, the core permeability recovery rate is ≥85%, and the core permeability retention rate is ≥90%.

The invention provides a conditioner for sludge dewatering as well as a preparation method and application thereof, and relates to the technical field of sludge treatment. The conditioner for sludge dewatering is prepared from the following components in parts by weight: 0.3 to 0.4 part of acrylamide, 25 to 30 parts of trimethylallylammonium chloride, 65 to 70 parts of dimethyl diallyl ammonium chloride, 1.0 to 2.0 parts of a surfactant, 1.1 to 1.8 parts of a photoinitiator and 150 to 170 parts of deionized water. By avoiding the use of a large amount of inorganic coagulant and lime, the combustion value of the sludge is kept, the water content of the sludge is lower than 50%, incineration treatment of a power plant is facilitated, and green emission is achieved. The conditioner is neutral and small in dosage, corrosion to the filter cloth is avoided, blockage of the filter cloth is reduced under the promotion action of the surfactant, sludge can be conveniently stripped from the filter cloth, the service life of equipment is prolonged, and the use cost of the conditioner, the transportation cost of the sludge and the operation cost of the plate and frame desliming machine are reduced.

The application relates to the technical field of printing and dyeing fixing agents, and particularly discloses a formaldehyde-free fixing agent and a preparation method thereof. The formaldehyde-free fixing agent is prepared from raw materials in the following proportions by weight: dimethyl diallyl ammonium chloride 81-162 parts; acrylamide 9-18 parts; ammonium persulfate 5-7 parts; epichlorohydrin 55-105 parts; tetraethylenepentamine 9-18 parts; triethylamine 4.5-9 parts; dimethylamine 9-18 parts; water 90-120 parts; triallylamine 0.5-1 part; the dimethyl diallyl ammonium chloride, the acrylamide, the ammonium persulfate and the epichlorohydrin are used for preparing product A; the tetraethylenepentamine, the triethylamine, the dimethylamine and the epichlorohydrin are used for preparing product B; the product A, the product B, the water and the triallylamine are mixed to obtain the formaldehyde-free fixing agent. The formaldehyde-free fixing agent of the application can balance the permeability and the reaction film-forming property after application, and has excellent fixing performance.

The application discloses an organic-inorganic hybrid formaldehyde-free fixing agent and a preparation method and application thereof, and belongs to the technical field of textile auxiliaries. The fixing agent is prepared by using dimethyl diallyl ammonium chloride and methacryloyloxyethyl trimethyl ammonium chloride as reaction monomers, N-vinyl pyrrolidone as an organic modifier, and trisodium phosphate and bismuth nitrate as inorganic modifiers, and the organic-inorganic hybrid crosslinking structure is formed through a polymerization reaction. The preparation method comprises the following steps: pre-complexing bismuth nitrate and citric acid, pre-activating a silane coupling agent, mixing the components, and then performing stage pH regulation, ultrasonic-assisted dispersion, high-temperature curing and other steps. The fixing agent is prepared by means of coordination crosslinking of an organic polymer chain and bismuth ions and covalent connection of a silane coupling agent, so that a double network structure is formed, the wet rubbing fastness and the soaping fastness are significantly improved, the fabric is endowed with antibacterial and ultraviolet resistance functions, the hydrophilicity and the hand feeling are improved, and the fixing agent does not contain formaldehyde, and can be widely applied to post-treatment of textile dyeing.

The invention belongs to the field of organic synthesis, and discloses a hyperbranched formaldehyde-free fastness improver, which is prepared from the following raw materials: hyperbranched polyamidoamine (HPAMAM), dimethyl diallyl ammonium chloride (DMDAAC), diallyl amine and polyether amine. The mass ratio of the hyperbranched polyamidoamine to the dimethyl diallyl ammonium chloride to the diallyl amine to the polyether amine is (5-10): (30-50): (5-15): (5-10); the number of terminal amino groups and imino groups of the hyperbranched polyamidoamine is 15-17. According to the fastness improver, hyperbranched polyamidoamine is taken as a core, DMDAAC and diallylamine are grafted to a hyperbranched structure, a high-density cation and flexible chain segment synergistic system is constructed, the performance bottleneck of a traditional formaldehyde-free auxiliary in the aspect of wet rubbing fastness is broken through, the wet rubbing fastness of sensitive colors such as bright red and turquoise blue is remarkably improved, and the color fastness improver has a wide application prospect. Meanwhile, the advantages of being environmentally friendly, soft, hydrophilic and the like are kept, and the method has a good industrialization prospect.

The invention discloses a preparation method of an antibacterial epoxy resin coating, and relates to the technical field of coatings. According to the invention, the 5-phenylpent-2, 4-dienoic acid is esterified and combined with the side chain of the epoxy resin, so that the hardness and heat resistance of the cured coating are improved; then addition reaction with dimethyl diallyl ammonium chloride, 2-acrylamide phenylboronic acid and the modified antibacterial agent is performed to form a three-dimensional network structure, so that the mechanical strength of the coating is remarkably enhanced, the antibacterial, high-adhesion and anti-stripping effects are achieved, a phenylboronic acid structure is assisted, a protective film is formed on the surface of an object, the object is effectively isolated from the external environment, and the service life of the coating is prolonged. Oxidation and corrosion of the object surface are prevented, and the corrosion-resistant effect is achieved. According to the modified antibacterial agent, S-adenosine-L-homocysteine and silver nitrate are subjected to a coordination reaction, and the antibacterial effect is achieved; then, the silicon dioxide is combined with vinyl trichlorosilane, silane groups are introduced, after curing, the mechanical strength and water resistance of the coating are remarkably enhanced, corrosive liquid is prevented from entering the coating, and the corrosion-resistant effect is indirectly improved.

The invention provides a bio-based cationic surfactant and a preparation method thereof.The bio-based cationic surfactant is a copolymer and is prepared from raw materials including, by mass, 10-30 parts of glucose acrylate, 20-40 parts of dimethyl diallyl ammonium chloride, 15-35 parts of methacryloyloxyethyl trimethyl ammonium chloride, 5-10 parts of sodium hydroxide, 5-10 parts of sodium hydroxide, 5-10 parts of sodium hydroxide, 5-10 parts of sodium hydroxide, 5-10 parts of sodium hydroxide and 5-10 parts of sodium hydroxide through a copolymerization reaction. The adhesive comprises, by mass, 10-25 parts of glucose acrylate, 10-25 parts of dimethyl diallyl ammonium chloride, 10-25 parts of methylacryloyloxyethyl trimethyl ammonium chloride, 10-25 parts of diallylamine hydrochloride and an initiator, and the addition amount of the initiator is 0.5%-5% of the total mass of glucose acrylate, dimethyl diallyl ammonium chloride, methylacryloyloxyethyl trimethyl ammonium chloride and diallylamine hydrochloride. The preparation method comprises the steps of preparing acrylic acid glucose ester and carrying out water-phase copolymerization reaction. According to the invention, the strong pollutant adsorption capacity brought by high cationic degree and the broad-spectrum water purification efficiency brought by the synergistic effect of multiple functional groups are realized at the same time.

The invention relates to the technical field of aqueous zinc ion batteries, and particularly discloses a modified zinc powder negative electrode containing dimethyl diallyl ammonium chloride and a preparation method of the modified zinc powder negative electrode. Dimethyl diallyl ammonium chloride serves as a functional additive and is used for modifying zinc powder added into corrosion inhibitors such as bismuth oxide (Bi2O3), and the zinc powder negative electrode stable in circulation is constructed. The dimethyl diallyl ammonium chloride is an ionic surface active agent with high charge density and has certain bonding performance. Meanwhile, the material has the advantages of high stability, low toxicity, low cost and the like, can be used as a key material for developing and improving the cycling stability of a zinc powder negative electrode, and provides a new solution for large-scale production of aqueous zinc ion batteries.

The present application relates to a kind of oil-permeable water-blocking film-coated quartz sand for fracturing and its preparation method, and the oil-permeable water-blocking film-coated quartz sand for fracturing is three-layer core-shell structure, core is amino silane coupling agent modified quartz sand, middle layer is thermosetting epoxy resin, and outer layer is functional polymer layer;Preparation raw materials of middle layer include epoxy resin A, multifunctional epoxy resin, epoxy resin with double bond and amino resin, the epoxy resin A is selected from at least one in bisphenol type epoxy resin, phenolic epoxy resin;Preparation raw materials of outer layer include (Methyl) propenoic acid C6-C10 alkyl ester, fluorine-containing propenoic acid ester, isobornyl acrylate, dimethyl-diallyl ammonium chloride, bis (3-trimethoxysilylpropyl) fumarate.Solve the defect that the interface bonding force of resin layer and quartz sand matrix of film-coated quartz sand in prior art is insufficient, improve the interface bonding capacity, with excellent oil-permeable water-blocking performance and high temperature and high pressure resistance.

The invention relates to a method for co-processing fracturing waste liquid and petroleum produced water, and relates to the technical field of water treatment. The method comprises the following steps: carrying out hardness removal treatment on the fracturing waste liquid, wherein the calcium ion concentration of the treated fracturing waste liquid is 28.5-165 mg / L, and the pH value is 9.0-11.0; and uniformly mixing the fracturing waste liquid subjected to hardness removal with petroleum produced water according to a volume ratio of (1-9): (9-1), sequentially adding an inorganic flocculant and an organic flocculant, and filtering after flocculating settling to obtain reinjection water. The inorganic flocculant is at least one of polyaluminum chloride and polyferric sulfate; the organic flocculating agent is at least one of cationic polyacrylamide and poly dimethyl diallyl ammonium chloride. According to the method, the fracturing waste liquid and the petroleum produced water are used for cooperative treatment, the treatment cost is reduced, the suspended matter content and the oil content in the treated water are lower than 5.0 mg / L and 3.0 mg / L respectively, and the scaling amount is lower than 20 mg / L.

This application belongs to the field of organic synthesis and discloses a formaldehyde-free fixing agent based on a triazine-latent isocyanate functional monomer. It is prepared from triazine-latent isocyanate functional monomer (TLI monomer), dimethyl diallyl ammonium chloride (DMDAAC), and diallylamine as raw materials; the mass ratio of the triazine-latent isocyanate functional monomer, dimethyl diallyl ammonium chloride, and diallylamine is 10~30:30~48:10. This fixing agent uses the TLI monomer, which simultaneously integrates a triazine structure, hydroxyl groups, polymeric double bonds, and latent isocyanate groups, as its core. Through copolymerization with DMDAAC and diallylamine, a triple synergistic fixing system of "electrostatic adsorption-hydrogen bond anchoring-covalent crosslinking" is constructed, breaking through the performance bottleneck of traditional formaldehyde-free fixing agents in terms of wet rubbing fastness, and significantly improving the wet rubbing fastness of sensitive colors such as bright red and turquoise blue.

The invention relates to the field of drilling fluid, and discloses a water-based drilling fluid wall-fixing stabilizer, which is obtained by carrying out emulsion polymerization reaction on dimethyl diallyl ammonium chloride, acrylamide, N-acryloyl dopamine, acrylic acid and vinyl trimethoxy silane. In addition, the invention also discloses a preparation method and application of the wall-fixing stabilizer. Compared with the prior art, the wall-fixing stabilizer has the advantage that the borehole wall stability and hydration inhibition performance of shale are remarkably improved.

This invention relates to the field of defluorination agent technology, specifically to an adsorption-type defluorination agent based on nanomaterials and its preparation method. The adsorption-type defluorination agent based on nanomaterials provided by this invention comprises the following raw materials in parts by weight: 9-15 parts nano-alumina; 15-25 parts inorganic acid; 2-5 parts cationic surfactant; and 60-70 parts water. By adding a cationic surfactant (e.g., one or a mixture of dimethyl diallyl ammonium chloride and dimethylaminoethyl methacrylate) and an inorganic acid to the alumina defluorination agent, this invention can improve the adsorption and flocculation capacity of alumina, thus economically and effectively overcoming the shortcomings of insufficient fluoride removal rates in traditional defluorination agents.

The application relates to the field of oil and gas development, in particular to a centrifugal liquid diluent, a drilling fluid compounding system and preparation and application thereof. The centrifugal liquid diluent comprises 90-110 parts of acrylamide, 20-40 parts of 2-acrylamido-2-methylpropanesulfonic acid, 1-20 parts of dimethyldiallylammonium chloride, 50-70 parts of n-hexane, 50-70 parts of Span 80 and 0.5-5 parts of an initiator. The drilling fluid compounding system comprises a drilling fluid centrifugal liquid, a centrifugal liquid diluent and diesel oil, wherein the mass percentage of the centrifugal liquid diluent in the drilling fluid compounding system is 0.3-0.5% based on the mass of the drilling fluid centrifugal liquid, and the mass percentage of the diesel oil is 20-50%. The application can solve the problem of poor high-temperature resistance of the diluent in the prior art.

This invention relates to a method for preparing and applying a core-shell structured silica plugging agent with a rigid inner structure and a flexible outer structure for marine drilling fluids, belonging to the field of deepwater oil and gas drilling. This invention uses N-vinyl-2-pyrrolidone, dimethyl diallyl ammonium chloride, acrylamide, and 2-acrylamide-2-methylpropanesulfonic acid polymerized and grafted onto the surface of nano-silica to form a core-shell structured silica plugging agent with a rigid inner structure and a flexible outer structure. By utilizing the rigid plugging of nanomaterials and the flexible plugging of polymer deformation, this method effectively seals the micro- and nano-pores of shale and mudstone, thereby maintaining wellbore stability. Simultaneously, it effectively inhibits the secondary formation of hydrates, improving the safety and efficiency of deepwater drilling. Furthermore, the plugging agent of this invention reduces the need for large amounts of thermodynamic inhibitors, saving costs and possessing environmentally friendly properties.

The application relates to a high-temperature-resistant and salt-resistant modified organic resin polymer and a preparation method and application thereof, and belongs to the field of oilfield treating agents. The high-temperature-resistant and salt-resistant modified organic resin polymer comprises the following components in parts by weight: acrylamidoethyl dimethyl benzyl ammonium chloride 18-20 parts, 2-acrylamido-2-methylpropane sulfonic acid 14-16 parts, N-phenyl acrylamide 10-14 parts, N,N'-methylene bisacrylamide 0.5-0.9 parts, azobis-dicyanopentanoic acid 0.3-0.5 parts, N-vinyl caprolactam 10-12 parts, N-(hydroxymethyl)-2-methyl-2-acrylamide 10-12 parts, dimethyl diallyl ammonium chloride 8-10 parts, modified nanoscale montmorillonite 6-8 parts, polyethylene glycol dipropylene acid ester 0.3-0.5 parts and sodium bisulfite 0.1-0.2 parts. The application solves the problem of insufficient temperature resistance and salt resistance of polymer additives in the development of complex oil and gas fields.

The invention belongs to the field of petroleum and natural gas exploration, and discloses a carbon dioxide trapping absorbent as well as a preparation method and application thereof, so as to relieve and prevent pollution and damage caused by CO2 invasion to water-based drilling fluid. The method comprises the following steps: crushing plant straws, and putting the crushed plant straws into a reaction container filled with a strong alkali solution for reaction to obtain a liquid material; adding lignite into the liquid material and uniformly stirring to obtain a first mixed material; adding acrylamide and dimethyl diallyl ammonium chloride into the first mixed material, and stirring to obtain a second mixed material; and adding an initiator into the second mixed material for copolymerization reaction to obtain the carbon dioxide trapping absorbent. Functional groups contained in the carbon dioxide trapping absorbent prepared by the method can quickly trap carbon dioxide invading into slurry to form a more compact mud cake, so that invasion of more carbon dioxide is prevented, and pollution and damage caused by invasion of CO2 to water-based drilling fluid are relieved.

The invention provides an inorganic matter and organic matter compounded clay stabilizer for water injection, and discloses that dimethyl diallyl ammonium chloride is used as a raw material, and a phenol polymerization inhibitor is added to prevent polymerization in the use process, so that cationic monomer micromolecules containing double bonds are used as an organic cationic clay stabilizer, and the water injection efficiency is improved. When being used together with the same small-molecular-weight amine raw material, namely triethylamine hydrochloride, the anti-clay swelling agent has the performance of preventing clay swelling, anti-scouring capability and long-term effect, and has better performance of preventing clay swelling after being compounded with cheap inorganic raw materials, namely monopotassium phosphate, industrial ammonium chloride and industrial potassium chloride; the prepared clay anti-swelling agent compounded by the inorganic matter and the organic matter not only has excellent capability of preventing clay swelling, but also has good anti-scouring capability and good washing resistance, and plays an innovative demonstration role in preventing damage of clay swelling and migration to a reservoir in water injection and improving water drive recovery efficiency.

The invention discloses polyacrylamide capable of keeping efficient bridging capability under a high-salt condition. The polyacrylamide is prepared from the following components in parts by weight: 85 to 95 parts of acrylamide, 20 parts of 2-acrylamido-2-methylpropanesulfonic acid, 10 to 15 parts of dimethyl diallyl ammonium chloride, 0.2 to 0.25 part of isopropanol, 0.02 part of EDTA-2Na (Ethylene Diamine Tetraacetic Acid), 0.03 to 0.04 part of ammonium persulfate, 0.025 to 0.035 part of sodium hydrogen sulfite and 360 to 385 parts of deionized water. The invention also provides a preparation method of the polyacrylamide and application of the polyacrylamide in treatment of high-salinity wastewater. The polyacrylamide disclosed by the invention has excellent salt resistance through the strong hydration capability of the sulfonic acid group and the synergistic effect of a hydrophobic associated physical network, is particularly suitable for treating high-salt wastewater, and has a wide application prospect.

The invention discloses retention rate enhancing and low-temperature initiating polyacrylamide for papermaking, which is prepared from the following components in parts by weight: 85 to 95 parts of acrylamide, 15 to 20 parts of dimethyl diallyl ammonium chloride, 10 to 12 parts of acryloyloxyethyl trimethyl ammonium chloride, 2 to 5 parts of ammonium sulfate, 4 to 8 parts of adipic acid, 0.03 to 0.06 part of EDTA-5Na (Ethylene Diamine Tetraacetic Acid), 0.02 to 0.05 part of initiator VA-044 and 0.02 to 0.03 part of sodium hypophosphite. The cleaning agent is prepared from the following components in parts by weight: 0.02-0.03 part of ammonium persulfate, 0.02-0.03 part of ammonium ferrous sulfate and 372-380 parts of deionized water. The invention also provides a preparation method of the polyacrylamide and application of the polyacrylamide as a papermaking retention aid. Polyacrylamide polymerization reaction is carried out at low temperature, external heating is not needed, energy consumption is reduced, in addition, chain termination reaction is effectively inhibited by low temperature, high-activity free radical concentration is ensured by synergistic initiation of the initiator VA-044, and the product is high in molecular weight, narrow in distribution, high in bridging efficiency and not prone to excessive flocculation. And high retention efficiency and good paper sheet uniformity are achieved.

This invention provides a thickener for fracturing, its preparation method, and its application. The preparation method includes: reacting monomers in an aqueous environment using an azo initiator and a redox initiator; the resulting product is then granulated, hydrolyzed, dried, and powdered to obtain the thickener for fracturing; wherein, based on the total monomer mass of 100%, the monomers include 64.5%-70.5% hydrophilic monomers, 5.5%-7% cationic monomers, 18%-24.5% anionic monomers, and 4.5%-7.0% composite supramolecular interaction monomers; the hydrophilic monomer is acrylamide; the cationic monomer is dimethyl diallyl ammonium chloride and / or acryloyloxyethyltrimethylammonium chloride; the anionic monomer is sodium acrylate; the composite supramolecular interaction monomers include a mixture of hexadecyl dimethyl allyl ammonium chloride, octadecyl dimethyl allyl ammonium chloride, and silane monomers in a mass ratio of 4.1-4.5:1:0.3-0.7.

The invention relates to the technical field of sludge treatment agents, and discloses a photopolymerization complex-based efficient sludge conditioner preparation method, which comprises three branch schemes of copolymer conditioner preparation, polymeric salt conditioner preparation and fusion type conditioner preparation. The preparation method of the copolymer efficient sludge conditioner adaptive to the high-organic-matter sludge comprises the following steps: step 1, taking dimethyl diallyl ammonium chloride as a core monomer, wherein the molecular weight is 1 million to 3 million, the purity is more than or equal to 98 percent, the chloride ion is less than or equal to 0.5 percent, and the cation degree is more than or equal to 80 percent; the auxiliary reagents comprise a photoinitiator 1173 (the purity is larger than or equal to 99% and accounts for 0.05-0.1% of the mass of DMC) and an EDTA-2Na stabilizer (the purity is larger than or equal to 99% and accounts for 0.01-0.02% of the total mass of the system). Compared with the defect that the pH of sludge is sharply changed to 12 or above due to lime conditioners, the pH of the prepared conditioner finished product is stabilized within the neutral range of 6.8-7.2, the conditioner finished product can be directly adapted to conditioning of anaerobic sludge, biochemical sludge and the like, and the conditioner finished product has the advantages of being simple in preparation process, low in cost and easy to popularize and apply. Concentrated sulfuric acid does not need to be additionally added for neutralization.