51results about How to "Increase Zeta Potential" patented technology

The invention discloses a method for modifying clay by chitosan and algae removal technology application of chitosan modified clay. The clay is modified by utilizing a chitosan solution with the concentration of 0.2mg / mL to 2g / mL and the modified clay and a traditional coagulant are compounded according to the mass ratio ranging from (1 to 2) to (2 to 1); a cationic surfactant is added to increase the bubble stability of air dissolved water and enhance the hydrophobic property of alga; medicament components are mutually compounded to generate a synergistic effect. A compound coagulant provided by the invention has a rapid coagulation speed, a strong adsorption and bridging capability and low cost and does not contain components harmful to human bodies. The modified clay prepared at an earlier stage and the coagulant are compounded and then are added; a surfactant is added in a stirring process; most of the alga in water are removed through a dissolved air floatation device. After medicines are added into raw water, solid-liquid separation is carried out through a dissolved air floatation method, the content of chlorophyll a (Chl-a) can be reduced to 5mu g / L and the removal rate reaches 95 percent or more.

The present invention relates to a nanoparticle comprising a specific binding reactant, said nanoparticle being useful for determining an analyte to which analyte or complex comprising said analyte said binding reactant is specific. Characteristic for the nanoparticle is that the diameter of said nanoparticle is less than 200 nm, said nanoparticle is coated with multiple said specific binding reactants to the extent that the affinity constant of said nanoparticle towards said analyte essentially exceeds that of free said binding reactant towards said analyte and / or the association rate constant between said nanoparticle and said analyte essentially exceeds the association rate constant between free said binding reactant and said analyte; and said nanoparticle comprises a detectable feature. The invention also relates to biochemical assays using said nanoparticle. The assay further relates to a proximity based homogenous assay comprising a first group labeled with an energy donating compound (donor) and a second group labeled with an energy accepting compound (acceptor), wherein the donor is luminescent and has a long excited state lifetime and the acceptor is luminescent having a short or long excited state lifetime or the acceptor is non-luminescent, and the increase or decrease, respectively, in the energy transfer from the donor to the acceptor resulting from shortening or lengthening, respectively, of the distance between said groups, is measured. Characteristic for the assay is that the donor is a nanoparticle.

The invention discloses a method for preparing high-specific surface area precipitated calcium carbonate. The method comprises the following steps: proportioning quick lime obtained by shaft kiln burning and slaking water according to a ratio, carrying out a slaking reaction, and removing impurities by a vibrating screen; conveying concentrate calcium hydroxide into a stripper for grinding for 30-60 minutes, and passing through a 200-mesh vibrating screen so as to remove the impurities after grinding completion; regulating the concentration of the ground calcium hydroxide slurry to be 6-10%, reducing the temperature to 15-20 DEG C, conveying into a carbonization kettle, immediately adding a composite crystal-shape controller accounting for 0.2-0.8% of dry weight of the precipitated calciumcarbonate after a gelation process in the reaction system disappears, adding a dispersing agent accounting for 3-5% of the dry weight of the precipitated calcium carbonate when the conductivity of the reaction system is reduced to be 5.0ms / cm, and continuing carbonizing until the reaction is completed; and sequentially performing pressure filtration dehydration, drying, grinding and classifying on the calcium carbonate slurry obtained in the step 3. The precipitated calcium carbonate prepared in the invention is high in specific surface area and high in SO2 capture efficiency and is high in desulfurization efficiency and low in production cost.

The invention provides an electrochemical and anaerobic membrane combined biological sewage treatment plant and a treatment method thereof. The electrochemical and anaerobic membrane combined biological sewage treatment plant comprises a reaction tank in which a sacrificial anode electrode, a non-sacrificial anode electrode and a membrane module cathode are disposed. The electrochemical and anaerobic membrane combined biological sewage treatment plant further comprises a power supply device. A positive electrode of the power supply device is electrically and independently connected to the sacrificial anode electrode and the non-sacrificial anode electrode, respectively, and a negative electrode of the power supply device is electrically connected to the membrane module cathode. According to the present invention, electrochemistry and an anaerobic membrane bioreactor are combined, and pre-removal of pollutants, increase of sludge size and neutralization of sludge surface charges are achieved through electroflocculation; pollutants are electrostatically repelled by means of an electric field, and the morphology of a filter cake layer is improved by a hydrogen evolution reaction, achieving in-situ electrical cleaning of the membrane surface; the activity of microorganisms is stimulated by the electric filed so as to increase the metabolic rate of the microorganisms and promoting amethane yield. Moreover, pH decrease caused by metabolic acid production by microorganisms is mitigated by metal ions from electroflocculation.

The invention provides emulsified asphalt which is prepared from, 50wt%-60wt% of asphalt, 1.5wt%-4.5wt% of built emulsifiers and the balance water, wherein the built emulsifiers comprise 1wt%-3wt% ofcationic emulsifiers and 0.5wt%-1.5wt% of non-ionic emulsifiers. The invention further provides a preparation method of the emulsified asphalt. According to the emulsified asphalt, as the built emulsifiers are added, the emulsified asphalt has superior storage stability, and the performance of the emulsified asphalt meets PC-2 type emulsified asphalt standard requirements in JTG-F40-2004 highway asphalt pavement construction technical specifications.

The invention discloses an aluminum base gelling and curing agent, which comprises calcium aluminate, sulfur aluminum cement and an early-strengthening coagulant aid, wherein the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5. The invention also discloses a preparation method of the above aluminum base gelling and curing agent. According to the method, the calcium aluminate, the sulfur aluminum cement and the early-strengthening coagulant aid, in the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5, are ground, sieved, mixed and stacked up in a cone shape. After that, samples are pressed flat, and peripheral samples are stacked up centrad again in a cone shape and then pressed flat. So repeatedly for several times, and then the aluminum base gelling and curing agent can be obtained. The invention also discloses a method for treating the dredged sediment by means of the above aluminum base gelling and curing agent. Waste and gravels in the mud of the dredged sediment are separated, and then the cationic-type polyacrylamide is added to thicken and dehydrate the dredged sewage. After that, the aluminum base gelling and curing agent is added and mixed with the dredged sewage, and the mixture is stirred. Meanwhile, a water reducer is added and mixed uniformly with the above mixture. After the dehydration and solidification process, the obtained product is subjected to stabilization maintenance. The aluminum base gelling and curing agent is higher in economic, social and environmental benefits.

The invention provides a preparation method of carbon-calcium aluminate composite powder. By the method, aluminium oxide is adopted as raw material, and organic acid calcium is adopted as raw material, in non-oxidizing atmosphere, carbon-calcium aluminate composite powder is obtained by high temperature sintering. The organic acid calcium has two effects, organic acid acts as a calcium source and a carbon source, by taking advantage of this characteristic, in high temperature non-oxidizing atmosphere, sintering is conducted on organic acid calcium and aluminum oxide, pyrolysis is conducted on organic acid calcium, carbon is reduced, new generated calcium oxide and aluminium oxide in the raw materials react to form a calcium aluminate, carbon / calcium aluminium powder is synthesized in one step by utilizing this characteristic. The method has the characteristic of in-situ synthesis, and carbon source is added by means of chemical reactions, carbon source after the chemical reactions gets into composite materials, the dispersity of carbon is greatly increased, far superior to the dispersity of the carbon added by means of physical penetration in the prior art.

The invention discloses a method for preparing a water-soluble nanometer preparation by insoluble traditional Chinese medicine containing ring structures. The water-soluble traditional Chinese medicine nanometer preparation is prepared by hydrophobic solubilization action of the insoluble traditional Chinese medicine containing the ring structures and amphiphilic chitosan derivatives containing bile acid hydrophobic groups. The preparation method has the advantages of simplicity, feasibility and easy popularization. The required equipment and raw materials have low cost and are easily obtained. The prepared water-soluble nanometer drug carrier has better biocompatibility, can perform the function of releasing the traditional Chinese medicine slowly, and can bring better social benefit and economic benefit.

The invention relates to anti-collapsible injectable magnesium phosphate-based bone cement. The anti-collapsible injectable magnesium phosphate-based bone cement is composed of a powder phase and a liquid phase, and the powder phase comprises magnesium oxide, potassium dihydrogen phosphate, calcium phosphate salt, citric acid (or sodium citrate) and polysaccharide (or a polysaccharide derivative),wherein the magnesium oxide is 26-28 parts by mass, the potassium dihydrogen phosphate is 52 to 55 parts by mass, the calcium phosphate salt is 16 to 18 parts by mass, the citric acid (or sodium citrate) is 0 to 4 parts by mass, and the polysaccharide (or polysaccharide derivative) is 0 to 1 part by mass. The liquid phase is an aqueous solution of glycerin. The powder phase and the liquid phase are uniformly mixed at a ratio of 1.8 to 2.4 g / mL, a mixture is conditioned for 4 to 6 minutes to form viscous slurry, and the mixture can be injected by a syringe. The injectable magnesium phosphate-based bone cement has good anti-collapsing performance, suitable coagulation time and high strength, is degradable, has good cell compatibility, and is suitable for injection filling of orthopedic anddental cavity defects in ordinary or minimally invasive surgery.

The invention relates to a steatite ceramic compound grinding aid which is compounded by two or more raw materials in parts by weight: 5-20 parts of vinyl bistearamide, 3-15 parts of triethyl hexyl phosphate, 5-20 parts of polyethylene glycol aliphatic ester, 10-30 parts of polyethylene glycol, 15-25 parts of polyethyleneimine, 20-40 parts of sodium metasilicate, 20-40 parts of sodium tripolyphosphate, 10-25 parts of sodium dodecyl benzene sulfonate, 15-30 parts of sodium hexametaphosphate, 10-20 parts of triethanolamine, 10-20 parts of triisopropanolamine and the like. Without affecting a binder polyvinyl alcohol in preparation of the steatite ceramic pug, the product has a good grind-adding effect to the steatite ceramic pug, and the grinding time can be shortened from original 24-28 hours to at least 15-18 hours.

The invention discloses a high-temperature-resistant salt-resistant copolymer-type water-based drilling fluid loss reducing agent as well as a preparation method and an application thereof. The preparation method comprises the following steps: (1) dissolving a polymeric monomer in water, and adjusting the pH value to 5-8; (2) adding an initiator into the solution, and performing a reaction for 2-5hours at the temperature of 60-80 DEG C under mechanical stirring; and (3) carrying out freeze drying on a thick polymer aqueous solution after the reaction is finished, and crushing the reaction product to obtain the solid water-based drilling fluid loss reducing agent. The preparation process is simple, low in cost and wide in application range, and can ensure that water-based drilling fluid has good filtration performance under high temperature, high pressure and hypersalinity.

The invention relates to an in-situ polymerization method modified anion exchange resin as well as a preparation method and application thereof. The modified anion exchange resin is prepared by usingan anion exchange resin with a tertiary amine group [-N(CH3)2] as an organic framework, epoxy chloropropane and dimethylamine as a modifier and ethylenediamine as a cross-linking agent through modification. According to the modified anion exchange resin provided by the invention, the content of amino is increased, weak alkali groups are also increased, the Zeta potential of the modified anion exchange resin is also remarkably increased, and in addition, the isoelectric point of the modified anion exchange resin is 6.62 which is far greater than that of an unmodified resin material, so that theadsorption treatment function on Cr(VI) is greatly improved, and the modified anion exchange resin has the advantages of being stable in quality, excellent in adsorption property, low in cost, simplein solid-liquid separation, large in mechanical strength, high in adsorption capacity, good in regeneration effect, free of secondary pollution, and the like.

The invention discloses a preparing method of polyethylene imine nanometer gel, which comprises the following steps: placing polyethylene imine solution in the reacting bottle; deoxidizing; adding metal ionic solution according to different proportions rapidly; purifying after reacting; removing residual polyethylene imine nanometer gel. The Zeta potential is higher than +32mV with narrow grain size distribution, which is controllable between 30 and 80nm.

The invention discloses a magnetic responsive photonic crystal, and a simple large-scale preparation method and an application thereof. The structure of the magnetic responsive photonic crystal comprises a one-dimensional stable nano-chain structure assembled by Fe3O4 colloidal nanoparticles under the action of an external magnetic field; the Fe3O4 colloidal nanoparticles comprise aggregated Fe3O4nanocrystals, the surfaces of the Fe3O4 colloidal nanoparticles are covered with poly(4-styrenesulfonic acid-co-maleic acid) sodium salt (the molar ratio of benzenesulfonic acid to maleic acid is 3:1), and the highest Zeta potential value of the surfaces of the Fe3O4 colloidal nanoparticles is not less than -40 mV. The PSSMA-modified Fe3O4 colloidal nanoparticles are synthesized by a one-step solvothermal method, can be well dispersed in water and various non-aqueous solvents, can realize full-spectrum reversible discoloration under the action of an externally added magnetic field, and are brighter in color. And the preparation method is easy to amplify, and the amplified and synthesized Fe3O4 colloidal photonic crystal can still realize full-spectrum discoloration.

The invention discloses a preparation method for high-strength and high-porosity porous silicon nitride ceramics. According to the method, a sintering aid and a dispersant aqueous solution are sequentially added into Alpha-Si3N4 raw material powder, a defoaming agent is added after pH is regulated, so that water-based slurry is obtained, and by optimizing the sequence of adding each substance, each substance can play a role to the max. On the other hand, the water-based slurry is ball-milled and aged, so that the flowability of the slurry can be increased, soluble starch, polymethyl methacrylate (PMMA) and stearic acid, of which the micromorphologies are all spherical, are chosen as pore-forming agent, and while serving as the pore-forming agent, the spherical pore-forming agent can play the role of increasing the flowability of the slurry. In addition, slip casting can also break through the limitation of conventional compression molding on dies, and meets the shape complexity and diversity of porous ceramic parts.

An embodiment of the invention discloses a cleaning and finishing agent and an application method thereof. The cleaning and finishing agent comprises sodium gluconate, ammonium chloride, polyethylenepolyamine, lower alcohol, a non-ionic surfactant, an anionic surfactant and deionized water. Compared with a cleaning and finishing agent in the prior art, the cleaning and finishing agent has the advantages that the sodium gluconate, ammonium chloride, polyethylene playamine, lower alcohol, non-ionic surfactant, anionic surfactant and deionized water are used to treat the surface of a pore ring of a PCB board, and glass fiber exposed in the surface of the pore ring is cleaned through sodium gluconate and ammonium chloride; the surface of pore ring resin can be treated by polyethylene polyamine; pore walls can be wetted through the lower alcohol and non-ionic surfactant; the resin and glass fiber on the pore ring surface can be modified through the anionic surfactant to enable the surfaceof the pore ring to form high Zeta potential, effective adsorption capacity of a palladium activator is increased, backlight of electroless copper plating is improved, and the situation of hole-without-copper is reduced.

The invention provides an electrochemical and anaerobic membrane combined biological sewage treatment plant and a treatment method thereof. The electrochemical and anaerobic membrane combined biological sewage treatment plant comprises a reaction tank in which a sacrificial anode electrode, a non-sacrificial anode electrode and a membrane module cathode are disposed. The electrochemical and anaerobic membrane combined biological sewage treatment plant further comprises a power supply device. A positive electrode of the power supply device is electrically and independently connected to the sacrificial anode electrode and the non-sacrificial anode electrode, respectively, and a negative electrode of the power supply device is electrically connected to the membrane module cathode. According to the present invention, electrochemistry and an anaerobic membrane bioreactor are combined, and pre-removal of pollutants, increase of sludge size and neutralization of sludge surface charges are achieved through electroflocculation; pollutants are electrostatically repelled by means of an electric field, and the morphology of a filter cake layer is improved by a hydrogen evolution reaction, achieving in-situ electrical cleaning of the membrane surface; the activity of microorganisms is stimulated by the electric filed so as to increase the metabolic rate of the microorganisms and promoting amethane yield. Moreover, pH decrease caused by metabolic acid production by microorganisms is mitigated by metal ions from electroflocculation.

This invention discloses a kind of aqueous dispersion of the nano pigment and its preparation method. The said method is fixing the hydrophobic colorant fully dissolved in polymer monomers into the nano microballoons of the cross linking polymers at the molecule-separate and colorant-aggregative-phase state by using the modified polyreaction in fine latex to obtain the seeds of prepolymerization, then constructing a modified and protective cross linking encloser of the polymer by the enveloping polyreaction, and finally making the nano pigment grains stably disperse in the water medium dissolved with the surface activating agent at a low concentration. The invented aqueous dispersion of the nano pigment is suitable for aqueous ink-jet color marking ink in high performance and color-screened distemper pieces used for making liquid crystal display devices. It can also be applied in pigmentation of the coatings, pigment materials of the high-end cosmetics and so on.

The invention discloses an organic-inorganic nanoparticle composite water repellent agent, a preparation method and an application method thereof, and belongs to the field of environment-friendly textiles. According to the preparation method, tertiary amine polymer brush grafted nano silicon dioxide is subjected to amination with halogenated hydrocarbon containing a double-bond structure, and thenpolymerized with an acrylate monomer to prepare the organic-inorganic nanoparticle composite water repellent, wherein the obtained composite water repellent agent has good water dispersibility and high surface positive charge density, and does not influence the stability of cationic emulsion. In order to prevent the too thick water-repellent film from hindering the formation of bulges, a thin hydrophobic layer needs to be built, inorganic nano silicon dioxide particles after fabric treatment can be adsorbed on the surface of cotton fibers along with cationic latex particles by controlling theuse amounts of organic components and inorganic components in the water repellent, and projections are provided during organic matter film formation, so that the roughness of the surface of the cotton is increased, the hydrophobic property of the water repellent is improved, the use amount of the water repellent is reduced to a certain extent, and environmental pollution is reduced.

The invention relates to a cleaning composition with a long-acting nursing effect. The cleaning composition comprises the following components in percentage by weight of (a) 10-20wt% of laurinol polyether sulfate; (b) 1-5wt% of sodium N-lauroylsarcosinate; (c) 5-10wt% of a thickening agent; (d) 1-6wt% of a preservative; (e) 0.1-1wt% of essence; (f) 0.1-1wt% of a colorant; (g) 0.2-2wt% of modifiedtourmaline; and (h) 50-75wt% of water. According to the cleaning composition with the long-acting nursing effect, tourmaline is modified, so that long-acting adsorption of the tourmaline on the surfaces of hair and skin can be guaranteed, and antibacterial, deodorizing and purifying effects can be more durable; amino acid components such as sodium lauroyl sarcosine and sodium lauroyl glutamate areparticularly added, so that the skin can be deeply moisturized and nourished, besides, skin dirt is cleaned, sweat smell is purified, grease is reduced, and the effects of mildness and low irritationare achieved.

The invention provides a polypeptide monolayer film with high surface potential and hydrophobicity as well as preparation and application thereof. The polypeptide is composed of polypeptide moleculeswith a molecular weight of (1.48+ / -0.2) x 10<5> g / mol, the thickness of the monolayer film is 17.3-18.5 nm, the exposure amount of primary amino groups on the surface of the film is 11-11.8%, and theZeta potential of the polypeptide monolayer film is -3 mV to -2 mV. The contact angle of the film is 84+ / -1 degrees. The surface of the polypeptide monolayer film has a micro-nano structure, so that the film has a certain hydrophobic property, and biological bionic skin surface waterproofing is facilitated. The surface of the polypeptide monolayer film has higher potential, so that the biocompatibility, the blood compatibility and the adhesion, proliferation and differentiation capabilities of cells can be improved.

The invention discloses a preparation method for an intraocular medicine delivery system of polyacrylic resin wrapping montmorillonite loading medicine. The method comprises the steps that modified montmorillonite activated by acid adsorbs medicine to obtain the montmorillonite loading medicine; the polyacrylic resin and the medicine are dissolved in an organic solvent under the ultrasonic heatingcondition, the montmorillonite loading medicine is added, and an organic phase is prepared; a surface active agent is dissolved in water to prepare a water phase; the organic phase is injected into the water phase, the organic phase and water phase mixture is subjected to ultrasonic processing, after ultrasonic processing, the mixture is continuously stirred, the organic solvent volatilizes, andthe system is obtained. The particle size of the prepared nanometer medicine delivery system of the polyacrylic resin wrapping the montmorillonite loading medicine is small and is in nanoscale, the system has higher Zeta electric potentials and better adhesion to the mucosa surface, and therefore the system is beneficial for medicine absorption and utilization. A large number of toxic and organicsolvents are not used, and the operation is simple and convenient.

The invention relates to a method for prolonging the service life of an A-plane sapphire window polishing fluid. The method comprises the following processes: 1), during chemical and mechanical polishing of an A-plane sapphire, taking the A-plane sapphire window polishing fluid, and measuring the potential by using a Zeta potential analyzer to monitor the change condition of the Zeta potential ofthe A-plane sapphire window polishing fluid; 2), when the absolute value of the Zeta potential of the A-plane sapphire window polishing fluid is monitored to be not higher than 18 mv, directly addinga non-ionic surfactant into the A-plane sapphire window polishing fluid in use, when the absolute value of the Zeta potential of the A-plane sapphire window polishing fluid is not lower than 25.0 mv,stopping adding, then monitoring the Zeta potential once every 0.5-1.5 hours, and repeating the process, wherein the non-ionic surfactant is one or a mixture of several of fatty acid methyl ester ethoxylate, dodecyl polyethylene glycol carboxylate and fatty alcohol polyoxyethylene ether which can increase the Zeta potential of the polishing fluid and do not adversely react with the polishing fluidafter addition.

The invention provides PGE1 (prostaglandin E1) freeze-dried microemulsion composition. The composition is prepared from PGE1, a non-ionic emulsifier, chondroitin sulfate, anionic phospholipid and a freeze-drying protective agent, and raw materials and components comprise, in percentage by mass, 0.001%-0.04% of PGE1, 1%-55% of the non-ionic emulsifier, 0.1%-20% of anionic phospholipid, 0.6%-28% of an oil phase and 5%-98% of the freeze-drying protective agent. The encapsulation efficiency and the stability of the composition are significantly improved, reduction of free drug concentration is facilitated, vascular irritation of a preparation is reduced, and the composition is safer and more stable.

The invention discloses a metal surface dewaxing agent, and belongs to the field of metal surface treatment. A prepared solubilizing additive is a polymer with amphiprotic hydrophobic association prepared by emulsifying through the compounding of Span-80 and alkanolamide, and the grafted-copolymerization of acrylamide and 2-acryloylamino-2-methallyl sulfonate, and has high stability, corrosion resistance and an anti-static performance; an adhered waxy molecule is quickly dispersed in water by utilizing a hydrophilic group, so that the dewaxing efficiency is improved; a prepared adsorption corrosion-inhibition protection agent is added with benzyl chloride and epoxy chloropropane so as to carry out quaterisation, and a film can be quickly formed on ta metal surface by utilizing a good micelle assembling performance, so that a workpiece protection performance is improved; and an added dewaxing cleaning active agent is compounded by fatty alcohol polyoxyethylene ether and the like, and the solvent is used for solubilizing so as to accelerate the stripping speed, so that the dewaxing efficiency is improved, and a workpiece is protected. The metal surface dewaxing agent provided by theinvention solves the problems that a current dewaxing agent is low in dewaxing efficiency and easy to corrode the workpiece.

The invention relates to a method for prolonging the service life of an A-plane sapphire window polishing fluid. The method comprises the following processes: 1), during chemical and mechanical polishing of an A-plane sapphire, taking the A-plane sapphire window polishing fluid, and measuring the potential by using a Zeta potential analyzer to monitor the change condition of the Zeta potential ofthe A-plane sapphire window polishing fluid; 2), when the absolute value of the Zeta potential of the A-plane sapphire window polishing fluid is monitored to be not higher than 18 mv, directly addinga non-ionic surfactant into the A-plane sapphire window polishing fluid in use, when the absolute value of the Zeta potential of the A-plane sapphire window polishing fluid is not lower than 25.0 mv,stopping adding, then monitoring the Zeta potential once every 0.5-1.5 hours, and repeating the process, wherein the non-ionic surfactant is one or a mixture of several of fatty acid methyl ester ethoxylate, dodecyl polyethylene glycol carboxylate and fatty alcohol polyoxyethylene ether which can increase the Zeta potential of the polishing fluid and do not adversely react with the polishing fluidafter addition.

The invention discloses a dispersing agent and a method for improving the magnetic performance of a bonded permanent magnetic ferrite material, the combined action of sodium polyacrylate and calcium gluconate is beneficial to promoting dispersion of ferrite particles and preventing particle aggregation, the aqueous solution of sodium polyacrylate is alkaline, and the hydrolysis of the dispersing agent is prevented by adjusting the pH value of the solution, the Zeta potential between the powder is improved, and due to the improvement of the Zeta potential, stronger electrostatic repulsive force can be obtained between particles, the dispersity of the magnetic powder particles is improved, the orientation degree of the permanent magnetic ferrite and the stability of slurry are improved, so that the purpose of improving the magnetic performance of the bonded permanent magnetic ferrite is achieved; the magnetic performance of the bonded permanent magnetic ferrite prepared by the method is obviously improved, and compared with the addition or single addition of a dispersant under the condition of an alkaline or weakly alkaline grinding medium, the addition of the combined dispersant into the alkaline grinding medium can obviously improve the magnetic performance of the permanent magnetic ferrite.