360 results about "Diallyldimethylammonium chloride" patented technology

A hemostatic composition for stopping or decreasing blood flow from an open wound or medical or surgical procedure. Compositions of the invention comprise a mixture of a cationic polymer and a cation exchange material. In one embodiment, the composition comprises a mixture: (1) a high molecular weight copolymer of diallyl dimethyl ammonium chloride (DADMAC) and acrylamide [DADMAC copolymer], and (2) the hydrogen form of a crosslinked, sulfonated polystyrene (hydrogen resin). In an exemplified embodiment, a composition of the invention comprises the mixture of DADMAC copolymer and hydrogen resin provided in a dry powdered form. The compositions of the invention may be applied directly to a wound or treatment site, or they may be incorporated into a wound dressing, such as a bandage. The seal formed at a wound or treatment site treated with the present invention is adhesive and exhibits considerable toughness.

The invention provides a method for preparing magnetic ferroferric oxide / conductive polyaniline light-weight composite hollow microspheres, which relates to a method for preparing a magnetic ferroferric oxide / conductive polyaniline composite material. The invention solves the problems of high density and easy agglomeration of the traditional magnetic nanometer particle / conductive polymer composite material. The method comprises the following steps of: regulating ferrous chloride and ferric chloride solutions to be alkaline, adding sodium dodecyl benzene sulfonate and reacting to obtain ferroferric oxide; and modifying hollow glass microspheres by using poly(diallyldimethylammonium chloride) solutions after alkaline cleaning, then reacting the hollow glass microspheres with the ferroferric oxide, sequentially immersing obtained solid particles by using the poly(diallyldimethylammonium chloride) solutions and polystyrene sulfonic acid solutions, then adding the solid particles to aniline solutions, initiating polymerization by using ammonium persulfate, and washing and drying the solid particles to obtain the composite hollow microspheres. The composite hollow microspheres have both conductivity and magnetism, the density is 0.78-0.8g / cm<3>, and the composite hollow microspheres are not easy to agglomerate and are used for fields of military equipment stealth technology and civil anti-electromagnetic radiation.

The invention relates to a high-temperature-resistant copolymer oil well cement retarder and a preparation method thereof. The preparation method comprises: respectively weighing four polymerization monomers such as 2-acrylamide-2-methylpropanesulfonic acid, diallyldimethylammonium chloride, maleic anhydride or itaconic acid or fumaric acid, and acrylic acid or methacrylic acid according to the mass ratio of 45-80:5-17:7-18:8-20, dissolving the first three monomers in water, then adding sodium polyphosphate and diphenylcarbazide, then successively adding a chain transfer reagent and an initiator, and finally dropwise adding the forth monomer, performing heating reaction and adjusting the pH value, so as to obtain the copolymer retarder. The invention also provides the high-temperature-resistant copolymer oil well cement retarder prepared by the above preparation method. The retarder is resistant to a high temperature up to 230 DEG C and is weak in dispersibility at a high temperature, the cement paste strength develops fast at a low temperature, the addition amount of the retarder has good linear relation with the cement paste hardening time, and the cement paste comprehensive performance is good.

A method comprising the steps of: (A) forming a fluid comprising a crosslinked polymer, wherein the crosslinked polymer comprises: (i) a first monomeric unit of one or more N-vinyl lactams; and (ii) a crosslinker selected from the group consisting of: divinyl ether, diallyl ether, vinyl or allyl ethers of polyglycols or polyols, divinylbenzene, 1,3-divinylimidazolidin-2-one, divinyltetrahydropyrimidin-2(1H)-one, dienes, allyl amines, N-vinyl-3(E)-ethylidene pyrrolidone, ethylidene bis(N-vinylpyrrolidone), and any combination of any of the foregoing; and (B) introducing the fluid into a portion of a well. The crosslinked polymer may additionally comprise: a second monomeric unit selected from the group consisting of: acrylamide, N-substituted acrylamides, methacrylamide, N-substituted methacrylamides, acrylates, methacrylates, acrylic acid, methacrylic acid, N-vinylamides, N-allyl amides, vinyl alcohol, vinyl ethers, vinyl esters, allyl alcohol, allyl ethers, allyl esters, vinylpyridine, vinyl sulfonates, allyl sulfonates, vinylimidazole, allylimidazole, diallyldimethylammonium chloride, and any combination of any of the foregoing.

The invention discloses a method for preparing a graphene-loaded platinum nano catalyst, which comprises the following steps of: (1) preparing graphene (GNS); (2) preparing polydiallyl dimethyl ammonium chloride (PDDA) functional graphene; and (3) preparing the graphene-loaded platinum nano (Pt / GNS) catalyst. The method has the advantages of uniformly adsorbing and distributing PtCl6<2-> with negative charge on the surface of the GNS through electrostatic adhesion by using positive charge uniformly distributed on the surface of the PDDA-modified GNS, solving the technical problem that metallic particles per se aggregate, realizing higher loading rate of PtNPs and having uniform grain size and controllable size.

The invention discloses a preparation method of a flexible transparent conducting polymer thin film with antibacterial properties, and belongs to the technical field of nanocomposite materials. The preparation method comprises the steps: preparing stably dispersed graphene oxide (GO) colloid by a Hummers method at first; next, performing surface modification on the graphene oxide under the electrostatic adsorption action of poly(diallyldimethylammonium chloride) (PDDA) and preparing a nanowire / graphene nano hybrid material by a method of inducing the growth of silver nanowires in situ, and then further preparing a silver nanowire / graphene / polyvinyl alcohol thin film by a solution casting method. The thin film has the characteristics of antibiosis, high electricconductivity, high lighttransmittance, flexibility and the like, and is expected to be applied to a plurality of fields such as biosensing and nano-devices; and therefore, the flexible transparent conducting polymer thin film with antibacterial properties has a wide application prospect.

The invention discloses a high polymer composite coagulant for disposing oily wastewater and preparing method, which comprises the following steps: setting ingredient and weight ratio of high polymer composite coagulant with polymeric aluminium chloride : polymeric ferric sulfate : soluble glass : polydiene propyl dimethyl amchlor : water = 39.00:(1.90-2.10):(0.26-0.31):(1.04-1.52):(57.80-57.10); setting 0.02% basic ion polyacrylamide in polydiene propyl dimethyl amchlor; preparing finite density water solution with raw material as first step; preparing flocculant intermediate with polyaluminium chloride, polymeric ferric persulfate and sodium silicate as second step; proceeding mixed reaction with flocculating agent intermediate of the second step and polydiene propyl dimethyl amchlor of 0.02% positive ion polyacrylamide; controlling condition as temperature at 70-90 deg.c, pH value at 4-7; stirring intensity at 50-70r / min and ripening time at 6-24h.

The present invention is directed to the use of a combination of a polymeric chelant and coagulant to treat metal containing wastewater. More particularly, the invention is directed at removing copper from CMP wastewater. The composition includes a combination of (a) a polymeric chelant derived from a polyamine selected from the group consisting of diethylenetriamine (DETA), triethylenetetraamine (TETA), tertraethylenepentaamine (TEPA), poly[vinylamine], and branched or linear poly[ethylenimine] (PEI); and (b) a water soluble or dispersible copolymer of a tannin and a cationic monomer selected from the group consisting of methyl chloride or dimethyl sulfate quaternary salt of dimethyl aminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, dimethylaminopropyl methacrylamide, dimethylaminopropyl acrylamide, and diallyl dimethyl ammonium chloride.

The invention discloses a dual-mode optical imaging probe and a preparation method thereof. The dual-mode optical imaging probe comprises nano particles which are dispersed in a water solution, each nano particle comprises a core body and a wrapping layer, wherein the core body is a gold or silver nano aggregate; the wrapping layer is multilayer PDDA (Poly (Diallyldimethylammonium Chloride)) and PSS (Poly Sodium Styrenesulfonate) which are alternately adsorbed; and the outermost layer of the wrapping layer is PDDA with fluorescent materials absorbed. The preparation method of the dual-mode optical imaging probe comprises the following steps of: preparing the Raman marker-induced gold or silver nano aggregate; then adding a PDDA water solution to a water solution of the Raman marker induced gold or silver nano aggregate, stirring, and then alternately adsorbing PSS and PDDA for multiple times; then adding the fluorescent materials and the PDDA water solution, and the like. The dual-mode optical imaging probe has both surface enhanced Raman signals and fluorescent signals, high sensitivity, easiness of optical probe multifunction realization and important application values in the fields of drug targeted transportation, biological sensing, detection, and the like; and the preparation method of the dual-mode optical imaging probe has the advantages of easiness of operation, good repeatability, low cost and environmental friendliness.

The invention discloses a high-temperature saturated salt resistant fluid loss reducer for water-based drilling fluid, and aims at solving the problems that the existing fluid loss reducer for drilling fluid difficultly meets the requirements for high-temperature resistance and high-concentration salt resistance of complex formation. The fluid loss reducer is prepared from the following raw materials: 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, acrylic acid, N-vinyl pyrrolidone, diallyldimethylammonium chloride and the like. The preparation method is simple, the reaction condition is mild, the conversion rate is high, the requirement for equipment and environment is low, and industrial batch production of the fluid loss reducer can be realized easily. The fluid loss reducer can effectively reduce water loss of the drilling fluid, can resist high temperature (230 DEG C) and the saturated salt, and has remarkably superior effect to the varieties of the existing fluid loss reducers.

The invention discloses a polyelectrolyte and graphene composite resistive moisture sensor and a manufacturing method thereof. The polyelectrolyte and graphene composite resistive moisture sensor uses a ceramic as a substrate on which a plurality of pairs of interdigital gold electrodes are arranged; a moisture sensitive film is coated on the ceramic substrate and the interdigital gold electrode surfaces, the moisture sensitive film is a polyelectrolyte poly (diallyldimethylammonium chloride) and graphene composite. The moisture sensor has the advantages of moderate impedance value, high sensitivity, good linearity, small dampness and can be detected at room temperature in a wide humidity range, in particular in a low humidity environment, can be widely applied to the accurate measurement and control of the environmental humidity in the fields of industrial and agricultural production, storage, atmospheric environment monitoring and the like, in particular the humidity in a low humidity environment.

The invention specifically relates to arrayed silver nanorods with surface-modifying gold nanoparticles and a preparation method thereof, belonging to the field of nano-materials. The objective of the invention is to realize surface modification of a silver nanorod array prepared by using a physical evaporation coating process; the surfaces of silver nanorods are modified by polyelectrolyte (poly[diallyldimethylammonium chloride]) with positive electricity at first, then gold nanoparticles having a diameter of about 15 nm and synthesized by using a wet chemical process are used as a raw material which self-assembles on the surfaces of silver nanorods through electrostatic interaction, and thus, the silver nanorod array with surface-modifying gold nanoparticles is prepared. The technology of gold nanoparticle modification of the surfaces of silver nanorods brought forward in the invention has the advantages of safe and easy operation, mild conditions, low cost, etc. and enables gold nanoparticles to be uniformly fixed on the surfaces of silver nanorods so as to form a gold-silver composite structure.

The invention discloses a methanol rejective membrane for a direct methanol fuel cell as well as a preparation method and application thereof. The methanol rejective membrane is formed by a Nafion membrane and a composite layer. The preparation method comprises the following steps: 1) pretreating the Nafion membrane to obtain a membrane A; 2) immersing the membrane A in a poly(diallyldimethylammonium chloride) solution to ensure that the surface of the membrane A carries positive charges by an electrostatic self-assembly method to form a membrane B; and 3) immersing the membrane B in a graphene oxide aqueous solution to form the methanol rejective membrane. The methanol rejective membrane can be applied to preparation of a membrane electrode assembly, can be used for improving the performance of a direct methanol fuel cell system and the utilization of fuel; the preparation method has the characteristics of environmental friendliness and the like, is simple and easy to operate, and has a good application prospect.

The invention in particular relates to a graphene tube-wrapped metal nitride nanobelt and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a metal oxide precursor nanobelt; (2) stirring and ultrasonically dispersing the weighed and dried metal oxide precursor nanobelt in distilled water, adding a poly dimethyl diallyl ammonium chloride solution, continuously stirring, centrifuging, measuring graphene oxide dispersion liquid prepared by adopting an Hummer process, dropwise adding the metal oxide precursor nanobelt obtained by centrifuging into the graphene oxide dispersion liquid, ultrasonically dispersing and stirring, after dispersing uniformly, performing suction filtration, and drying; and (3) stripping a dried membrane from a filter membrane, and annealing in an ammonia gas atmosphere. According to the prepared graphene tube-wrapped metal nitride nanobelt, the specific surface area of a material can be enlarged, the one-dimensional nanostructure provides a one-dimensional channel for electrolyte flow and ionic migration, and the electrochemical performance is good.

The present invention relates to a method and composition for controlling pitch and stickies deposit in a pulp and papermaking process using amphoteric copolymers of diallyldimethylammonium chloride (DADMAC) with acrylic acid and / or acrylamide and optionally a siliceous material.

The invention relates to compositions and methods of treatment employing compositions including a cationic polyelectrolyte, without any anionic polyelectrolytes, so that no polyelectrolyte complex (PEC) is formed. In addition to not forming PECs, and being free of anionic water-soluble polymers (i.e., an anionic polyelectrolyte polymer that could form a PEC with the cationic polyelectrolyte), the composition is also free of random copolymers, block copolymers, coacervates, precipitates, and silicone copolymers. The composition may be a concentrate, to be diluted prior to use to treat a surface.

The invention relates to a method for refining high purity cation integral dimethyl allyl amchlor. It uses chromatographic analysis method to assay determinate each volatile and non-volatile impurity substance component and the content of the cation integral solution, it adds cation integral solution in the tank and adds industry caustic soda solution to inactivating delivery the amine substance, it adds water so that the integral content of the solution is 35%~55%, it dose vacuum distillation on the two temperature ranges of the negative pressure, the vapor can be reclaimed by absorbing, the reacting liquid expels the expressed crystal NaCl after concavation or centrifugal filtration; it adds water into the filter liquid to adjust the integral content of the integral solution and adds a little of activated carbon to do decolouring treatment, it filters the activated carbon to obtain the cation integral product solution with little foreign substance and high purity.

The preparation process of composite magnetic microball includes the following steps: mixing polystyrene micorball with concentrated sulfuric acid to sulfonate polystyrene micorball; dispersing the sulfonated polystyrene micorball with surface negative charge successively in ammonium polydiallyl dimethyl chloride aqua, sodium polystyrene sulfonate aqua and ammonium polydiallyl dimethyl chloride aqua for standing adsorption before centrifugal water washing; dispersing in dilute magnetic fluid liquid for standing adsorption before centrifugal water washing; repeating the two standing adsorption steps until reaching the required layer number of ammonium polydiallyl dimethyl chloride and Fe3O4 of the composite magnetic microball. The said process is completed in aqua and has no environmental pollution.

The invention relates to the technical field of fixing agent, and provides cationic organic silicon modified poly(diallyldimethylammonium chloride) fixing agent and a preparation method thereof. The preparation method comprises the following main steps: uniformly mixing dimethyl diallyl ammonium chloride, an organic silicon monomer, chelator and deionized water; and introducing nitrogen gas to expel oxygen, then adding initiator, and performing free radical polymerization to obtain the cationic organic silicon modified poly(diallyldimethylammonium chloride) fixing agent. The fixing agent prepared through the method provided by the invention is used for finishing after dyeing, the dry and wet rubbing fastness (especially wet rubbing fastness) of anionic dye for dyeing can be enhanced, the shade is not influenced, and the feeling of textile can be kept soft; and the fixing agent prepared through the preparation method is free of formaldehyde, non-toxic and environment-friendly, and is novel dyeing and printing auxiliary agent.

The invention discloses a preparation method of a working electrode of a photoelectric sensor. The preparation method includes the following steps: cleaning an ITO electrode, and then drying to obtain an electrode A; dropwise adding a titanium dioxide colloidal solution on the surface of the electrode A, drying, then calcining, and cooling to obtain an electrode B; placing the electrode B in a poly(diallyldimethylammonium chloride) aqueous solution, soaking, cleaning, next placing in a carboxylated quantum dot colloidal solution, soaking, and cleaning to obtain an electrode C; fixing a probe DNA on the electrode C to obtain an electrode D; dropwise adding a gold nanoparticle-labelled target DNA onto the electrode D, and making the gold nanoparticle-labelled target DNA hybridized with the probe DNA, to obtain an electrode E; and activating the electrode E, fixing an organic dye sensitizing agent on the surface of the electrode E, and cleaning to obtain the working electrode of the photoelectric sensor. The invention also discloses the photoelectric sensor. The photoelectric sensor has the characteristics of high sensitivity, good specificity, simple and convenient detection method, and economic cost.

The invention discloses a polymer composite resistance-type humidity sensing element with a nanofiber structure and the preparation method thereof. The humidity sensing element adopts ceramics as a matrix, a plurality of pairs of interdigitated gold electrodes are arranged on the matrix, the surface of the ceramic matrix and the interdigitated gold electrodes are coated with poly (diallyldimethyl ammonium chloride) (PDDA) modifying film, and a poly-3-aminopropyl-triethoxysilane mono-brominated n-hexane quaternary ammonium salt, polyanion and polyoxyethylene composite nanofiber humidity sensing film with a cross-linked structure is settled on the modifying film. The humidity sensing film is in a good contact with an electrode substrate by means of the modifying film. The manufacturing method has the advantages of simple process and low cost. The prepared humidity sensing element has the characteristics of moderate impedance value in a wide humidity range, high sensitivity, good linearity, rapid response, good resilience, good stability, etc., and is widely applicable in precise measurement and control of ambient humidity in industrial and agricultural production process, storage, and atmospheric environment monitoring.

The invention relates to a hollow precious metal nanowire as well as a preparation method and application thereof. The method comprises the following steps: taking ascorbic acid as a reducing agent to reduce Pt or Rh and Ag salt to metal atoms; and taking poly (diallyldimethylammonium chloride) as a protective agent, and synthesizing an M-Ag hollow nanowire in one step at the room temperature under a template induction effect of the poly (diallyldimethylammonium chloride) on the growth of a nano material. Meanwhile, the surface of the Pt-Ag or Pd-Ag nanowire is coated with the protective agent, so that the stability and solubility of the Pt-Ag or Pd-Ag nanowire can be greatly improved, and a foundation is set for the application in the field of the biology and the field of catalysis in the future. The M-Ag hollow nanowire prepared by the method is simple in process, high in product yield, uniform and controllable in structure, short in preparation period, and convenient in rapid and mass preparation. The method is easy for controlling the preparation condition, simple in required equipment, relatively high in product preparation success rate and good in industrial application prospect.

An object of the present invention is to provide a production method which enables efficient production of an electro-deposited copper foil with further lower profile when compared to the low-profile electro-deposited copper foils which have been supplied to the market and is excellent in mechanical strength. For the purpose of achieving the object, a production method adopted obtains the electro-deposited copper foil by electrolyzing a sulfuric acid based copper electrolytic solution which contains a quaternary ammonium salt polymer having cyclic structure and chlorine, wherein for the quaternary ammonium salt polymer contained in the sulfuric acid based copper electrolytic solution, a DDAC dimer or higher polymer is used. For the quaternary ammonium salt polymer, a diallyl dimethyl ammonium chloride polymer having a number average molecular weight of 300 to 10000 is preferably used. The sulfuric acid based copper electrolytic solution preferably contains bis(3-sulfopropyl) disulfide or 3-mercapto-1-propanesulfonic acid that is a compound having a mercapto group.

The invention relates to a phospholipid bilayer membrane array fabricated by a multilayer polyelectrolyte membrane substrate and a fabrication method. A static layer-by-layer self-assembly technology is adopted to fabricate polyelectrolyte poly-(4-sodium styrene sulfonate) (PSS) and poly-(diallyl dimethyl ammonia chloride) (PDDA) multilayer membranes on a silicon substrate modified by 3-ammonia propyltriethoxysilane, the modified substrate is subjected to patterning by a photetching technology, arrays of a polyelectrolyte in different types are fabricated, a phospholipid bilayer membrane is fabricated at the bottoms of the arrays, and the phospholipid bilayer membrane array is fabricated. According to the method, the layer-by-layer assembly technology is introduced into the fabrication of the patterned substrate, the fabrication method of the phospholipid bilayer membrane array is enriched and expanded, the method has the advantages of simplicity in operation, mild reaction conditions, good controllability, high stability, low cost and the like, and a reliable technology is provided for the research and application of biological membrane characteristics with respect to the fields of membrane biophysics, interface chemistry, biochemistry, bionics and micro-nano technologies.

The invention relates to a preparation method of a special-purposed coagulant used for treating printing and dyeing waste water. The coagulant is prepared from raw materials of, by weight: 60 to 70 parts of hydrochloric acid, 13 to 17 parts of sodium meta-aluminate, 8 to 12 parts of ferrous chloride, 4 to 6 parts of potassium aluminum sulfate, 2 to 4 parts of sodium silicate, and 1.5 to 2.5 parts of poly(diallyldimethylammonium chloride). Hydrochloric acid, sodium meta-aluminate, ferrous chloride, and potassium aluminum sulfate are added into a reaction vessel, and are heated to 130 to 140 DEG C while stirring; the mixture is subject to a reaction for 3 hours, and the temperature is reduced to 90 to 100 DEG C; sodium silicate is added to the mixture, the obtained mixture is subject to a reaction for 1.5 hours, and the temperature of the mixture is reduced to 30 to 40 DEG C; poly(diallyldimethylammonium chloride) is added to the mixture while stirring, and the obtained mixture is well mixed, such that the coagulant is obtained. The obtained product has good water-solubility. With the coagulant, COD in waste water can be effectively reduced, wherein a removal rate is higher than 80%. When the coagulant is used for treating printing and dyeing waste water, a color removal rate is higher than 85%. The solid content of hydrochloric acid adopted in the product is 20%.

The invention relates to a modified ternary positive electrode material and a preparation method thereof and a lithium-ion battery. According to the preparation method, coating treatment is carried out on a ternary positive electrode material by using a coating solution containing graphene and a water-soluble polymer to obtain the modified ternary positive electrode material, wherein the water-soluble polymer is one or more of polyvinylpyrrolidone, polydiallyl dimethyl ammonium chloride and sodium polystyrene sulfonate. According to the preparation method of the modified ternary positive electrode material provided by the invention, coating treatment is carried out on the ternary positive electrode material by using the graphene and the water-soluble polymer, so that the surface adhesion capacity of the graphene can be improved through the water-soluble polymer and the coating stability of the graphene is improved; and meanwhile, a surface coating layer of the obtained modified ternarypositive electrode material contains the graphene and the water-soluble polymer, so that the dispersity and the structural stability of the positive electrode material in subsequent battery production can be improved through the water-soluble polymer, such as the polyvinylpyrrolidone, thereby fully developing the characteristics of the graphene and the ternary material.

The invention discloses a high-temperature-resistant high-density cement slurry for oil fields, which comprises the following components: cement, inorganic solid-phase weighting agent, dispersant, silica sand, microsilica fume, high-temperature water loss reducing agent, high-temperature retarder, and weighting stabilizer , defoaming agent; the high temperature resistant fluid loss reducing agent includes the following components: 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, acrylamide, vinylpyrrolidone, maleic anhydride, diallyl dimethyl ammonium chloride; the high temperature retarder includes the following components: oxidized starch, organic phosphonic acid, zinc oxide, sodium borate. The weighted stabilizer, high-temperature fluid loss reducing agent and high-temperature retarder in the oil of the invention solve the problems of unstable performance of high-density cement slurry and poor cementing quality.

The invention relates to a preparation method of quaternized zinc oxide sol as a textile finishing agent. In the preparation method, the quaternized zinc oxide sol is respectively prepared by taking diallyl dimethyl ammonium chloride, diallyl methyl dodecyl, myristyl, hexadecyl, octadecylselyl ammonium bromide and cetyltrimethyl ammonium chloride as additives and taking diallyl methyl alkyl quaternary ammonium as an additive, the monomers not only have a certain regulating function for the shape of the zinc oxide sol, but also can be used for remarkably improving the dispersion degree of the nano ZnO and reducing the grain size of the nano ZnO and can also be used for improving the performance of a finished textile; meanwhile, the quaternized zinc oxide sol can be subjected to cyclopolymerization with other monomers because of containing non-conjugated diene bonds. The quaternized zinc oxide sol has the bacteriostasis rate of 62-83% and the strength loss rate of 22-29% when being applied to the antimicrobial finishing of a cotton textile, and meanwhile, the quaternized zinc oxide sol has certain ultraviolet resistance.

The invention provides a nano ferric oxide-cationic polyelectrolyte coupled multielement composite flocculant, relating to an inorganic-organic composite flocculant. The invention provides a novel high-efficiency composite flocculant compounded by nano ferric oxide and cationic polyelectrolyte, wherein the nano ferric oxide is nano alpha-FeOOH, Fe3O4, alpha-Fe2O3, gamma-Fe2O3 and the like, and the cationic polyelectrolyte is polyamine, polyacrylamide, poly (diallyldimethylammonium chloride), chitosan and the like. The composite flocculant provided by the invention is applicable to micro-pollution water source strengthening treatment, the treatment effect on toxic and harmful pollutants (heavy metals, toxic organic matters and the like), humic acid and chromaticity is higher, and the composite flocculant provided by the invention has the advantages of good separating effect, rapid sedimentation, low effluent turbidity, wide pH application range and the like.