50results about How to "Polymerization is easy" patented technology

The invention belongs to the field of crop fertilizer and particularly relates to compound fertilizer synergist modified by oxidized graphene and a preparation method of the compound fertilizer synergist. The compound fertilizer synergist is prepared from, by weight, 70-80 parts of forestry and agricultural residues, 10-20 parts of a modifying agent, 0.5-1 part of a catalyst, 1-5 parts of stabilizer, 5-10 parts of cyclodextrin and 0.3-0.5 part of the oxidized graphene. The preparation method includes the steps that plasma illumination is utilized to conduct bombardment on the surfaces of forestry and agricultural residues, hydroxide radicals, carbanyl groups, carboxyl and other functional groups containing oxygen are introduced into the surfaces of the forestry and agricultural residues, then polymerization with water-soluble polymer modifier occurs under the action of high-field-intensity ultrasound waves, stable nanometer gel particles of three-dimensional network structures are formed, after modification with the oxidized graphene and cyclodextrin is completed, high adsorption, complexing power and a water-retaining property are achieved, nutrient elements in soil can be subjected to complexing, losing of fertilizer nutrients is reduced, the water retention and fertilizer retention performance of soil is improved, and the utilization rate of compound fertilizer can be remarkably raised. The compound fertilizer synergist has the advantages of being environmentally friendly, free of pollution, capable of raising the utilization rate of fertilizer and improving soil environment and the like.

The invention relates to a water-based aluminum powder pigment, and a preparation method and application thereof. The surface coating of the water-based aluminum powder pigment is silicon dioxide, the inside is aluminum powder, the outside of the surface coating is provided with connection points connected through chemical bonds, and each connection point is connected with a polymer. The connection point is 4,4'-azo(propyl 4-cyano(3'-dimethylchlorosilane)valerate), 4-azoisobutylcyano4-cyano(propyl (3'-dimethylchlorosilane)valerate) or azoisobutyldicyanophenyl(3-ethyldimethylchlorosilane), and the polymer is prepared by carrying out polymerization reaction on a polymerizable monomer. The initiator and polymer are firmly fixed to the silicon dioxide surface, and thus, have favorable protective effects on the inside aluminum powder. The water-based aluminum powder pigment has favorable dispersity in water-based paints and inks.

The invention provides a rubber reinforcing agent, a preparation method thereof, and a preparation method of butadiene styrene rubber. In the invention, firstly the rubber reinforcing agent having excellent reaction activity with butadiene styrene rubber latex is synthesized in a manner of mixing an aromatic compound containing an alkene unsaturated substituent and an organic siloxane monomer containing an alkene unsaturated substituent, adding an olefin metathesis catalyst and performing a normal-temperature reaction in a methylbenzene solvent with air and water isolated, and removing the methylbenzene solvent through a vacuum desolventizer to prepare the rubber reinforcing agent. The high-strength butadiene styrene rubber is prepared by feeding the rubber reinforcing agent and the butadiene styrene rubber latex into a polymerization kettle according to ratio with addition of an initiator, and performing a reaction for a certain time with reaction temperature controlled, and coagulating, washing and drying the product.

The invention discloses a method for preparing a starch graft cationic type hyperbranched vinyl or allyl amide polymer. The method comprises the following steps: preparing a mixed phase and a branching reagent phase, preparing a cationic monomer phase, gelatinizing the mixed phase at 25-95 DEG C for 0.1-1 hour, and adjusting the temperature to 40-80 DEG C; then adding a reversible addition-fragmentation chain transfer (RAFT) agent in the gelatinized mixed phase, adding an initiator to initiate a polymerization reaction; and finally adding the cationic monomer phase in a hyperbranched polymer system prepared from the mixed phase, and continuously reacting for 1-24 hours to obtain the starch graft copolymerization cationic type hyperbranched vinyl or allyl amide polymer. The method adopts the RAFT polymerization method and the semi-continuous polymerization technology and uses the diene monomer and the chain transfer agent with a low molar ratio to prepare the starch graft cationic typehyperbranched vinyl or allyl amide polymer in a polar solvent system with high polymerization rate and conversion rate, the polymerization reaction is easy to control and the turbidity removal effectof the product is remarkable.

The invention discloses a phosphate flame retardant containing a styrene structure, which is prepared from phosphorous acid dialkyl ester, 4-hydroxy styrenes and carbon tetrachloride reacting under the existence of a catalyst. The catalyst is compound of organic alkali and inorganic alkali. The organic alkali catalyst is pyridine or triethylamine or diethylamine or phenylamine or triethanolamine or diethanol amine or alkyl benzene amine or tetrabutylammonium hydroxide or tetraethylammonium hydroxide; the inorganic alkali catalyst is sodium bicarbonate or potassium bicarbonate or sodium hydroxide or potassium hydroxide or sodium carbonate or potassium carbonate or sodium benzoate or potassium benzoate; the molar ratio of the organic alkali to the 4-hydroxy styrenes is 3-1 to 1, and the molar ratio of the inorganic alkali to the 4-hydroxy styrenes is 1.1-1 to 1. A phosphate molecule contains active double bonds and is easily subjected to polymerization reaction together with the active double bonds such as styrene and the like. The carbon tetrachloride is adopted as a solvent to react at the low temperature in a synthesis process. The synthesis method has the advantages of high reaction yield, convenience for reaction operation, easiness of industrialization and the like compared with the traditional phosphoryl chloride method.

The invention discloses a high-temperature-resistant stone powder adsorption-resistant slump-retaining polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is prepared from the following components in parts by weight: 320 to 360 parts of unsaturated polyether macromonomer, 20 to 30 parts of unsaturated monocarboxylic acid, 6 to 10 parts of maleimide alkyl acid, 5 to 8 parts of unsaturated phosphate, 2 to 5 parts of unsaturated amino acid monoester, 2.5 to 5.0 parts of oxidant, 0.5 to 1.0 part of reducing agent and 1 to 3 parts of chain transfer agent. The pH value of the water reducing agent is 5.0-7.0, and the solid content of the water reducing agent is 40%-42%. The polycarboxylic acid water reducing agent can effectively solve the problems of insufficient initial fluidity of concrete, too fast slump loss and poor workability of a concrete mixture caused by incapability of simultaneously meeting high temperature resistance and limestone powder adsorption resistance of the existing water reducing agent, and has great significance in widening the engineering application field of the water reducing agent.

The invention discloses a preparation method for synthesizing an ultra-slow-release polycarboxylate superplasticizer from high-activity polyether. The preparation method comprises the following steps:S1, uniformly mixing unsaturated carboxylic acid monomers, unsaturated carboxylic acid monobasic ester, unsaturated carboxylic acid dibasic ester, a chain transfer agent and deionized water to obtaina material A, and uniformly mixing a reducing agent and deionized water to obtain a material B; S2, adding deionized water and a high-activity polyether monomer into a reaction kettle, and carrying out stirring and dissolving at normal temperature; S3, adding an assistant into a solution obtained in the step S2 at 10-20 DEG C, carrying out stirring, starting to dropwise add the material A and thematerial B, and carrying out a curing reaction after the dropwise addition is finished; and S4, adding alkali liquor to adjust a pH value to obtain the ultra-slow-release polycarboxylate superplasticizer. The ultra-slow-release polycarboxylate superplasticizer prepared by the invention has a good slump maintaining function, and can continuously release carboxyl groups with a dispersing function in an alkaline cement paste environment, so a concrete mixture can maintain plasticity for a long time, slump maintaining time can reach more than 3 hours, and the demand for long-distance transportation and construction of concrete is met.

The invention relates to the technical field of batteries and particularly relates to lithium titanate battery electrolyte and a lithium titanate battery. The lithium titanate battery electrolyte is composed of a lithium salt and an organic solvent; the organic solvent is prepared from the following raw materials: 10wt%-99.9wt% of a nitrile solvent, 0wt%-89wt% of an auxiliary solvent and 0.1wt%-5wt% of an additive. The nitrile solvent does not have a side reaction with a rock-salt-phase Li7Ti5O12 material at a charging state, and certain catalysis reactions which occur in the presence of carbonyl or hydroxyl can be effectively avoided; the decomposition of the electrolyte is reduced and the probability of producing gas by lithium titanate is reduced; a gas swelling phenomenon in the lithium titanate battery is reduced, so that the storage and circulating properties of the lithium titanate battery are improved. The lithium titanate battery provided by the invention takes the lithium titanate with relatively high electric potential as an electric potential negative electrode and the side reactions of the electrolyte and the electrode can be avoided, so that the stability of the lithium titanate battery electrolyte is enhanced.

The invention relates to the technical field of concrete admixtures, and discloses a polycarboxylate superplasticizer based on a 6C polyether macromonomer and a preparation method thereof, the polycarboxylate superplasticizer is prepared from the following raw material components through a chain transfer reaction: an acrylic monomer and diethylene glycol monovinyl ether, the molar mass ratio of the acrylic monomer to the diethylene glycol monovinyl ether is 3.5-5.5: 1; a catalyst used in the reaction is iron oxide, the iron oxide comprises ferric oxide and / or ferroferric oxide, and the addition amount of the iron oxide is 0.015-0.065% of the total amount of the raw material components; and the invention also discloses a preparation method. According to the polycarboxylate superplasticizer, the production condition is simple and easy to implement, industrial production is easy to realize, the cement dispersing performance and slump retaining performance of the product are excellent, the compressive strength of hardened concrete doped with the product in all ages is good, and the polycarboxylate superplasticizer is suitable for mortar and concrete preparation.

The invention discloses a preparation method of a high-adaptability polycarboxylate superplasticizer suitable for low-quality aggregate. The high-adaptability polycarboxylate superplasticizer is prepared from an unsaturated polyoxyethylene ether monomer a, an unsaturated carboxylic acid monomer b and an unsaturated phosphate ester monomer c in a molar ratio of 1:(3.0-4.5):(0.5-1.0) under the action of a redox initiator and a chain transfer agent by carrying out an aqueous solution free radical polymerization reaction, wherein the dosages of the oxidant, the reducing agent and the chain transfer agent are respectively 0.4-1.2%, 0.1-0.5% and 0.2-0.8% of the total dosage of the monomer. The preparation method disclosed by the invention has the advantages of simple process, easily controlled conditions, short reaction time, low energy consumption and the like. The prepared high-adaptability polycarboxylate superplasticizer has extremely high adaptability when being applied to gravel aggregate with poor quality, high mud content and machine-made sand concrete, and shows excellent dispersing performance and slump retention capacity.

A method for producing a polymer, which contains: bringing a monomer containing a vinyl bond into contact with a compressive fluid and melting or dissolving the monomer containing a vinyl bond, followed by carrying out addition polymerization of the monomer containing a vinyl bond in the presence of an initiator.

The invention belongs to the technical field of polyether polyol synthesis, and particularly relates to a preparation method of high-functionality polyether polyol, wherein the preparation method comprises the following steps: (1) by using a high-functionality initiator or a mixed initiator containing the high-functionality initiator as an initiator, adding alkylene oxide under the action of a catalyst, and carrying out a polymerization reaction to obtain oligomer polyether polyol; and (2) adding an initiator which is the same as the initiator in the step (1), a catalyst and alkylene oxide into the oligomer polyether polyol obtained in the step (1), and carrying out a polymerization reaction to obtain the high-functionality polyether polyol. According to the invention, a step-by-step secondary feeding mode is adopted, the high-viscosity initiator system is diluted to a certain extent, the olefin oxide addition reaction is easier to start, the problems of long initiation time and non-uniform polymerization are solved, the unsaturated value index of a polyether polyol product is lower, the actual hydroxyl value of the product is closer to the theoretical hydroxyl value, and the product can meet higher use requirements.

The invention relates to a method which using new ionic liquor polymerization initiation systerm prepares macromolecular compound. The technical matters of this invention needs to settle is providing a bran-new initiation systerm of atom radical transfer free radical polymerization which using ionic liquor as polymerization medium. The characteristic of this invention's method is the polymerization initiation systerm made up of ionic liquor, initiator and catalysator; the general formula of initiation systerm is [mim][RCOO] / R1X / MXn, the [mim][RCOO] is methyl imidazole organic acid salt ionic liquor, R is alkyl group; R1X is initiator, R1 is alkyl, X is halogen; catalysator MXn is transient metal inorganic salt, n is valence number equal to transition metal; initiation systerm reacts whth monomer can prepare the macromolecular compound of this monomer.

The invention discloses a cation-type quaternization organic fluorosilicon oil darkening finishing agent, and a preparation method and application thereof. The preparation method comprises the following steps: performing ring-opening reaction to polymerize octamethylcyclotetrasiloxane, 1,3,5-trimethyltris-1,5-(3,3-trifluoropropyl)-cyclotrisiloxane, N-(beta-aminoethyl)-gamma-aminopropyl methyldimethoxysilane, water and an end-capping reagent which are raw materials under the action of a strong-alkaline catalyst, so as to obtain amino-hydrocarbon modified organic fluorosilicon oil; performing reaction on N, N-dimethyl alkylamine and epoxy chloropropane to obtain glycidyl alkyl dimethyl ammonia chloride; adding an organic solvent, in which the glycidyl alkyl dimethyl ammonia chloride is dissolved, into the amino-hydrocarbon modified organic fluorosilicon oil for reaction, so as to obtain quaternized organic fluorosilicon oil; finally emulsifying the quaternized organic fluorosilicon oil in water. The method disclosed by the invention is environment-friendly and pollution-free; the obtained cation-type quaternization organic fluorosilicon oil emulsion is obvious in darkening effect on textiles, is particularly suitable for darkening dark polyester fabric and can well keep the style and the handfeel of the textiles.

The invention discloses an aliphatic polyester ionic polymer, which is prepared from aliphatic dibasic acid, aliphatic dihydric alcohol and a quaternary ammonium salt ionic monomer according to a mol ratio of 100:99.7:0.3-100:85:15 under the protection of nitrogen through esterification and polycondensation in sequence. The general structural formula of the aliphatic polyester ionic polymer is defined in the description. The aliphatic polyester ionic polymer has the intrinsic viscosity of 1.5-2.0 dL / g and the complex viscosity which is 1.6-3.1 times of that of pure aliphatic polyester at any appointed temperature in a range of 120-200 DEG C. The intrinsic viscosity and complex viscosity of the aliphatic polyester ionic polymer obtained in the invention are greatly improved, so that relatively high melt-strength, a low shear thinning effect, and excellent blow molding ability are ensured during a machine-shaping process, especially a blow molding process, and excellent foundation is laid in the application of extending the aliphatic polyester ionic polymer to the field of a film.

The invention relates to a preparation method of a molecular imprinting solid phase extraction film with a triphenylmethane molecule replacing malachite green, and application. The triphenylmethane molecule is adopted as a substituted template molecule for the malachite green for preparing the molecular imprinting film, so that the problems of high template molecule cost, leakage of the template molecule during use and the like during the preparation of a molecular imprinting polymer are solved, and meanwhile, the identification ability of a molecular imprinting is still kept. The method provided by the invention is stable in polymerization reaction without side reaction products, and the reaction is easy to control; the malachite green molecular imprinting film prepared through the method is stable in physicochemical property, high in selectivity and fast in mass transfer rate, not only can be combined with an instrument method (i.e. liquid chromatogram, liquid chromatogram-mass spectrometer, etc.), but also can be combined with a fast detection method (i.e. euzymelinked immunosorbent assay, colloidal gold immunization, a rapid detection kit method, etc.), and is suitable for separating, extracting and enriching the malachite green with trace concentration in a complex sample.

The invention relates to a method for preparing arborescent lactose-containing polyamidoamine modified gold nano-clusters, and in particular discloses a synthesis method of the arborescent lactose-containing polyamidoamine modified gold nano-clusters. The prepared gold nano-clusters can be used as a biosensor. The method comprises the following steps: synthesizing arborescent cystamine-containingpolyamidoamine of different generations through a Michael addition reaction, carrying out end group functionalization on the arborescent cystamine-containing polyamidoamine by using lactonolactone soas to obtain lactose group functionalized arborescent lactose-containing polyamidoamine Dm-Lac (m=1, 2, 3), and finally modifying the surface of gold nano-clusters with the arborescent lactose-containing polyamidoamine under the mutual actions of Au-S, thereby obtaining lactose-containing polyamidoamine modified gold nano-clusters (Dm-Lac@AuNCs) of different generations. The synthesis method provided by the invention is simple, and a simple and effective method is provided for preparing an efficient biosensor with thermosensitivity and targeting.

The invention provides a rubber reinforcing agent and a preparation method thereof and provides a preparation method for high-strength nitrile butadiene rubber through ternary polymerization of acrylonitrile, butadiene and the rubber reinforcing agent. In the invention, firstly a nitrile butadiene rubber reinforcing agent having excellent reaction activity with both the acrylonitrile and butadiene is synthesized through the steps of: mixing a nitrile compound containing an alkene unsaturated substituent group and an organic silioxane monomer containing an alkene unsaturated substituent group; with a methylbenzene solvent, adding an olefin metathesis catalyst, insulating air and water, and performing a reaction at normal temperature; and removing the solvent through a vacuum solvent removal device to prepare the nitrile butadiene rubber reinforcing agent. The reinforced nitrile butadiene rubber is prepared by adding the acrylonitrile, the butadiene and the nitrile butadiene rubber reinforcing agent into a polymerization kettle according to ratio, adding an emulsifier, soft water and an initiator, controlling reaction temperature and pressure, and performing a reaction for a certain time, performing condensation, and washing and drying a product to prepare the high-strength nitrile butadiene rubber.

The invention discloses a method for synthesizing carbon quantum dots by using hydrolyzed polymaleic anhydride (HPMA) as a main raw material, which comprises the following steps: dissolving the hydrolyzed polymaleic anhydride (HPMA) as the raw material into deionized water, and uniformly stirring; adding an organic amine solution into the system, and carrying out a closed hydrothermal reaction at140-230 DEG C; and after the reaction is finished, cooling and filtering the reaction solution to obtain a fluorescent carbon quantum dot solution. The fluorescent carbon quantum dots obtained by themethod emit blue fluorescence under an ultraviolet light source, and have the advantages of good water solubility, stable chemical properties, simple synthesis method, low raw material cost and the like.

The invention belongs to the technical field of foods, and discloses a beverage containing 3-hydroxybutyric acid, a preparation method and application thereof. The beverage comprises 3-hydroxybutyricacid, chitosan oligosaccharide and a solvent, wherein the mass fraction of 3-hydroxybutyric acid is greater than 20%, and the mass fraction of the chitosan oligosaccharide is 0.1-2%. Due to the existence of the chitosan oligosaccharide in the beverage, the 3-hydroxybutyric acid can stably exist, a polymerization reaction is not prone to being generated, the beverage is beneficial to human body absorption and is further beneficial to application of the 3-hydroxybutyric acid. According to the beverage containing the 3-hydroxybutyric acid, due to the introduction of the fruit juice and / or a sweetening agent, the taste of the beverage is good.

The invention relates to a preparation method for unsaturated polyester resin reinforced and toughened by modified natural plant fiber and a bio-based material. According to the invention, a bio-basedtoughening material is employed, modified soybean dreg fiber is adopted as a reinforcement, and thermosetting molding is performed to prepare a composite material. Soybean dregs are widely availableand low in cost, and can better bond with a polyester matrix after surface modification by a coupling agent. A biobased toughening improver is any one or a mixture of more selected from the group consisting of epoxidized soybean oil, epoxy ester and epoxy fatty acid ester. The method provided by the invention improves both the mechanical properties and the biodegradability of the unsaturated polyester composite material, and is simple in process and low in cost.

The invention relates to the technical field of concrete admixtures, in particular to a water-reducing polycarboxylate superplasticizer with a vinyl ether ester mixed structure and a preparation method of the water-reducing polycarboxylate superplasticizer. The water-reducing polycarboxylate superplasticizer with the vinyl ether ester mixed structure comprises an unsaturated acid monomer, a vinyl polyether macromonomer, an ester macromonomer and a crosslinking monomer. The water-reducing polycarboxylate superplasticizer with vinyl ether ester mixed structure provided by the invention has outstanding water reducing performance, can effectively improve the workability of concrete, and has very high practical value and popularization prospect.

The invention relates to a method for preparing sugar-containing polyamidoamine-modified nanoclusters, in particular to a method for synthesizing dendritic lactose-containing polyamidoamine-modified gold nanoclusters, and the prepared gold nanoclusters can be used as biosensors. Dendritic cystamine-containing polyamidoamines of different generations were synthesized by Michael addition reaction, and then functionalized with lactobionolactone to obtain glycosyl-functionalized dendritic polyamidoamine D m ‑Lac (m=1,2,3), and finally use the interaction of Au‑S to modify it on the surface of gold nanoclusters to obtain different algebraic dendritic gold nanoclusters modified with lactose-containing polyamidoamine (D m ‑Lac@AuNCs). The synthesis method of the invention is simple, and provides a convenient and effective method for preparing a high-efficiency biosensor with temperature sensitivity and targeting.

This invention relates to a preparation method for poly(butenedioic acid). Polymerization takes places in aqueous phase where there are monomers including one of several species of butenedioic acid and its derivatives, transition metal salts as catalysts and possibly hypophosphorous acid, phosphorous acid and their salts as well. It is initiated with the addition of guanyl isopropylazo hydrochloride and oxyol and the molecular weight of the polymers is over 800. Therefore, poly (butenedioic acid) with a high molecular weight can be prepared in this method and the common problems of low molecular weight and high molecular weight distribution that exist in current techniques can be effectively solved. And the consequent polymer product performs an active scale-inhibitory and corrosion-inhibitory effect and excellent properties of complex systems.

The invention provides a method of preparing a nitrile butadiene rubber reinforcing agent through an olefin metathesis catalyst and preparing high-strength nitrile butadiene rubber by graft-polymerizing nitrile butadiene rubber latex with the nitrile butadiene rubber reinforcing agent. In the invention, firstly the nitrile butadiene rubber reinforcing agent having excellent reaction activity with the nitrile butadiene rubber latex is synthesized through the steps of mixing a cyano compound containing an alkene or alkyne unsaturated substituent group with an organic silioxane monomer containing the alkene or alkyne unsaturated substituent group, and with a methylbenzene solvent, adding an olefin metathesis catalyst, insulating air and water, and performing a normal-temperature reaction, and separating the solvent through a vacuum desolventizer to prepare the nitrile butadiene rubber reinforcing agent. The nitrile butadiene rubber reinforcing agent and the nitrile butadiene rubber latex are fed into a polymerization kettle according to ratio with addition of an initiator, and performing a reaction with reaction temperature controlled for a certain time, and coagulating, washing and drying a product to obtain the high-strength nitrile butadiene rubber.

The invention discloses a method for preparing branched polyacrylonitrile and belongs to the field of macromolecular syntheses and functional polymer preparation. Methacrylic acid sulfhydryl propionyloxy ethyl ester is used as a branching monomer, azodiisobutyronitrile (AIBN) is used as an initiator and N, N'-dimethylformamide (DMF) or sodium thiocyanate aqueous liquid is used as a solvent to implement free radical polymerization with such monomers as acrylonitrile to successfully obtain the branched polyacrylonitrile. The degree of branching of the polymer is adjusted through adjusting molar ratio between the branched monomer and the polymer monomer. The methacrylic acid sulfhydryl propionyloxy ethyl ester with low cost and good storage stability and comprising polymerizable double bonds and chain transfer sulfhydryl is used as the branching monomer to successfully prepare the branched polyacrylonitrile under a conventional free radical polymerization condition. The polymerization is simple and easy; moreover, the monomer conversion rate is high and the degree of branching of the polymer is controllable.

The invention relates to a method which using new ionic liquor polymerization initiation systerm prepares macromolecular compound. The technical matters of this invention needs to settle is providing a bran-new initiation systerm of atom radical transfer free radical polymerization which using ionic liquor as polymerization medium. The characteristic of this invention's method is the polymerization initiation systerm made up of ionic liquor, initiator and catalysator; the general formula of initiation systerm is [mim][RCOO] / R1X / MXn, the [mim][RCOO] is methyl imidazole organic acid salt ionic liquor, R is alkyl group; R1X is initiator, R1 is alkyl, X is halogen; catalysator MXn is transient metal inorganic salt, n is valence number equal to transition metal; initiation systerm reacts whth monomer can prepare the macromolecular compound of this monomer.

The invention relates to a water-in-water type amphoteric polyacrylamide emulsion and a preparation method thereof. The method comprises: neutralizing acrylic acid with sodium hydroxide to obtain a mixture containing acrylic acid and sodium acrylate; mixing the mixture, an acrylamide monomer, a cationic monomer, a compound composed of a nonionic dispersant and an amphoteric dispersant Dispersant, surfactant, at least a part of inorganic salt, hydrophobic monomer, chelating agent and water are mixed uniformly to obtain a solution; the obtained solution is passed through nitrogen to remove oxygen, and then an initiator is added to initiate a polymerization reaction, and then subjected to aging and salting out treatment, A water-in-water type amphoteric polyacrylamide emulsion was prepared. The method of the invention is simple, the raw materials are easy to obtain, the cost is low, the required supporting equipment is less, the on-site operation is convenient, and it has huge economic benefits; the water-in-water type amphoteric polyacrylamide emulsion prepared by the method of the invention has good dispersibility and low apparent viscosity , high dilution viscosity, high active ingredient content, fast dissolution and storage resistance.