106 results about "Inorganic polymer" patented technology

Described is a method for extracting alkali from silicates under carbon neutral conditions. The method involves providing a reaction mixture containing an alkali-bearing aluminosilicate composition and an alkali base composition. The reaction mixture is treated with a combined activation and leaching process to form a concentrated alkali-silicate solution and an alkali aluminosilicate solid residue, where carbon dioxide is produced as a carbon dioxide reusable co-product from the activation. The alkali aluminosilicate solid residue is reacted with a first portion of the carbon dioxide reusable co-product to form an alkali leached aluminosilicate composition, thereby extracting alkali from the alkali-bearing aluminosilicate composition. Also described are methods of making inorganic polymer cement and concrete from the products and / or co-products produced by the method of extracting.

The present invention provides a hydrophobic organic-inorganic hybrid flocculant and a preparation method thereof. The flocculant has the following structural formula: The flocculant of the present invention is a hybrid flocculant that can combine the electrical neutralization ability of an inorganic polymer with the adsorption bridging effect of an organic polymer. The organic component and the inorganic component are combined in a covalent bond through the action of a silane coupling agent, and the flocculation performance is stable and good. At the same time, the present invention provides a method for preparing the above flocculant.

A tubular or non-tubular implant or prosthetic is provided to prevent or mitigate infection when implanted into a living body. The implant or prosthetic includes a textile layer comprising a plurality of interstices and / or pores and defining an interfacing surface and an opposing surface. The implant or prosthetic also includes a sealing layer comprising a non-porous, non-organic polymer adhered to the interfacing surface. The non-porous, non-organic polymer is formed of a material configured to prevent transmission or migration of bacteria through the sealing layer. The implant or prosthetic may also be configured to be anti-wetting and therefore provide for easier explantation from the body, to protect the textile layer from damage from electrocautery energy, and also to prevent leakage as well as transmural communication or migration through the graft body or wall while still allowing ingrowth of tissue along at least a portion of implant or prosthetic for secured anchoring.

The disclosure belongs to the technical field of inorganic non-metallic cementitious materials, and provides a phospho-alumino-silicate inorganic polymer, and a preparation method and use thereof. The phospho-alumino-silicate inorganic polymer includes the following raw materials in parts by weight: 50 parts to 67 parts of a precursor raw material, 33 parts to 50 parts of an activator, and water; where the precursor raw material includes metakaolin and activated calcium oxide; the activated calcium oxide accounts for 3% to 15% of a weight of the precursor raw material; and the activator includes a phosphoric acid solution. The phospho-alumino-silicate inorganic polymer obtained by the above formula could not only meet the pH value less than 11 of a sealing material of the geological repository for a high-level radioactive waste, but also could effectively support cracks and broken rocks.

A method for fixing an optical element on a substrate in an optical path of an optoelectronic component is specified, comprising the steps: - Providing the optical element having a first surface containing a first surface material and providing the substrate having a second surface containing a second surface material, wherein the first surface material and the second surface material are independently selected from transparent, oxide materials and transparent nitride materials, - applying an alkaline solution to the first surface and / or to the second surface, - Arranging the first surface on the second surface, wherein a connecting layer comprising an inorganic polymer network is formed between the first surface material and the second surface material. Furthermore, an optoelectronic component is specified. The optoelectronic component can be a light-emitting diode, for example, a µ-LED.

The invention relates to the technical field of corrosion prevention and rust prevention of building materials, in particular to an inorganic polymer reinforced concrete anticorrosive coating and a preparation method thereof. The inorganic polymer reinforced concrete anticorrosive paint comprises the following components in parts by mass: 60-70 parts of a base material, 8-12 parts of an anti-crack system, 10-15 parts of a modified filler, 5-8 parts of an auxiliary agent and 15-20 parts of a solvent, the base material is selected from alkali-activated metakaolin; the preparation method of the modified filler comprises the following steps: calcining a composite filler at 480-500 DEG C for 1.5-2 hours, cooling, dipping in a 10wt% tannic acid solution for 10-12 hours, filtering, dipping in a modified solution, ultrasonically dispersing for 20-30 minutes, vacuum-drying, crushing and sieving to obtain the modified filler. According to the inorganic polymer reinforced concrete anticorrosive paint and the preparation method, the problems that an anticorrosive coating is large in self-shrinkage rate, prone to cracking and difficult to adapt to a complex environment due to the single function in the prior art are solved.

The invention discloses an electrolyte, a lithium battery and electric equipment. The electrolyte comprises a solvent, a lithium salt and an additive, the additive comprises crown ether, alkali metal nitrate and cyclic lactone, and the alkali metal nitrate comprises at least one of potassium nitrate, rubidium nitrate and cesium nitrate. The electrolyte can form an SEI film with an inorganic-polymer composite structure on the surface of lithium metal, and the inorganic SEI film layer improves the uniformity of lithium ion transmission and inhibits the generation of lithium dendrites; the toughness of the SEI film is improved by the polymer part, and the damage of volume change to the integrity of the SEI film is reduced. Meanwhile, according to the scheme, the fast charging capacity of the electrolyte can be improved, and high-rate charging and discharging of the lithium metal battery can be achieved. Therefore, the electrolyte can stably act for a long time, and can tolerate the volume change of lithium metal.

The invention discloses a transparent heat-insulating coating based on up-conversion luminescent nanoparticles as well as a preparation method and application thereof, and belongs to the technical field of inorganic polymer materials. The coating comprises the following raw materials in parts by weight: 100-150 parts of a substrate coating, 5-10 parts of a dispersing aid and 0.5-3 parts of up-conversion luminescent nanoparticles. Traditional inorganic nanoparticles are changed, zinc oxide (ZnO), tin oxide (SnO), gallium oxide (Ga2O3), ytterbium oxide (Yb3O4) and erbium oxide (Er2O3) are used for forming functional components, and the functional components are matched with one another, so that the light-transmitting and heat-insulating coating with low nanoparticle addition amount is constructed. By adding a small amount of up-conversion nanoparticles into the coating, the application range of the up-conversion material is expanded, the blank of application of the material in research in the field of building coatings is filled, the performance of a traditional transparent heat-insulating coating is improved through the up-conversion luminescent material, and the light-transmitting heat-insulating performance of a paint film is greatly improved.

The invention discloses an anti-cracking phosphoric acid-based geopolymer, an anti-cracking recycled aggregate as well as a preparation method and application of the anti-cracking phosphoric acid-based geopolymer and the anti-cracking recycled aggregate. The method comprises the following steps: by taking a phosphoric acid solution with the mass concentration of 50-60% as a phosphoric acid excitation solution, firstly, adding metakaolin into the phosphoric acid excitation solution, and mixing, so that the aluminum-silicon structure of the metakaolin is fully deconstructed by phosphoric acid; the preparation method comprises the following steps: adding the phosphoric acid into a reaction system, adding fly ash, mixing to enable the phosphorus-aluminum ratio in the reaction system to be 1.2-1.4, magnetically stirring at 70-80 DEG C until the slurry is changed from red brown to gray, and generating an inorganic polymer network mainly comprising P-O-Al and P-O-Si bonds, namely the anti-cracking phosphoric acid-based geopolymer slurry. The modified recycled aggregate prepared by adopting the phosphoric acid-based geopolymer slurry in combination with three-stage maintenance not only has improved cracking resistance, but also has better mechanical properties. The performance of the prepared modified recycled aggregate is close to that of natural aggregate, and the modified recycled aggregate can be applied to asphalt concrete or asphalt pavements.

The present invention relates to a method for treating a fluid, comprising passing said fluid through an alkali-activated inorganic polymer material obtainable by a process of treating a slag comprising AI2O3, SiO2, and at least one iron oxide and / or iron oxy-hydroxide and / or iron hydroxide, for example red mud.

This invention relates to improving the performance of inorganic polymer material foams using aqueous emulsions of silanes / siloxanes and fatty acid salts, and to a process for preparing inorganic polymer material foams. The inorganic polymer material foams can be used for thermal insulation and construction, with densities ranging from 20 to 800 kg / m³, compressive strengths ranging from 0.1 to 5 MPa, and thermal conductivity ranging from 40 to 80 mW / m·K.

The application discloses a high-temperature-resistant composite gel system for low-permeability oil reservoir plugging, which is composed of the following components: 6-30% of inorganic polymer main agent, 0.02-1% of high-molecular organic thickening agent, 0.05-2% of crosslinking agent, 0.5-5% of curing agent, 0.1-5% of reinforcing agent, and the rest of water. The application discloses a preparation method of the high-temperature-resistant composite gel system for low-permeability oil reservoir plugging, and the specific steps are as follows: the formula amount of the inorganic polymer main agent, the formula amount of the high-molecular organic thickening agent, the formula amount of the crosslinking agent, the formula amount of the curing agent and the formula amount of the reinforcing agent are respectively added into the formula amount of water, and stirring is carried out at a rotating speed of at least 400 r / min for at least 60 minutes, so that the high-temperature-resistant composite gel system for low-permeability oil reservoir plugging is obtained. The application further discloses an application of the high-temperature-resistant composite gel system for low-permeability oil reservoir plugging as a profile control water plugging agent in the exploitation of low-permeability oil reservoirs.

Integrated circuit (IC) packages employing a re-distribution layer (RDL) substrate(s) with photosensitive non-polymer dielectric material layers for increased package rigidity, and related fabrication methods. To reduce or minimize warpage of an IC package employing a RDL substrate, the RDLs of the RDL substrate are photosensitive non-polymer dielectric material layers. The photosensitive non-polymer dielectric material layers can exhibit increased rigidity as a result of being hardened when exposed to light and cured during fabrication of the RDL substrate. The photosensitive non-polymer dielectric material layers can also exhibit increased rigidity as a result of being an inorganic polymer (e.g., SiOx, SiN material) that has a higher material modulus for increased stiffness and / or a lower coefficient of thermal expansion (CTE) for reduced thermal contraction and expansion, as opposed to for example, an organic polymer material (e.g., Polyimide) which has less stiffness and a higher CTE.

The invention discloses a photocatalytic treatment method for thiophanate-methyl wastewater, which belongs to the technical field of wastewater treatment and comprises the following steps: S1, adjusting the pH value of the thiophanate-methyl wastewater to 8-10, adding an inorganic polymer flocculation solution to adjust the pH value to 6-7, stirring, adding an organic polymer flocculation solution for flocculation, standing after stirring, and filtering to obtain filtrate; filter residues and first treatment waste liquid are obtained; s2, mixing the first treated waste liquid with hydrogen peroxide, and performing catalytic wet oxidation to obtain a second treated liquid; s3, a composite photocatalyst is added into the second treatment liquid, ultrasonic treatment is performed for 40-60 min under irradiation of an ultraviolet lamp, standing is performed for 2-4 h, filtering is performed, and filtrate is third treatment liquid; s4, evaporation and concentration are conducted on the third treatment liquid through a membrane distiller, and treatment is completed. According to the discharged water obtained through the treatment method, the COD removal rate is larger than 95%, and the NH3-N removal rate is larger than 93%.

The invention belongs to the technical field of titanium dioxide production waste resource utilization and inorganic polymeric flocculant preparation, and discloses a closed-loop process for preparing artificial rutile and co-producing polymeric ferric sulfate by using titanium dioxide primary washing waste acid. The method solves the problems of low resource utilization rate of titanium dioxide primary washing waste acid, high acid consumption in preparation of artificial rutile and high production cost of polyferric sulfate in the prior art. Comprising the following steps: pretreatment of titanium dioxide primary washing waste acid, reduction pretreatment of ilmenite, preparation of artificial rutile by leaching refined waste acid and reduced ilmenite, recovery of high-iron-content mother liquor, preparation of polyferric sulfate by oxidation-polymerization of the mother liquor, and cyclic utilization of washing water. The grade of the prepared artificial rutile TiO2 is greater than or equal to 92%, and the polyferric sulfate meets the national standard requirement; the waste acid resource utilization rate is larger than or equal to 98%, the comprehensive cost of the two products is reduced by 25-30%, and the method is suitable for waste resource utilization and fine chemical product collaborative production of sulfuric acid method titanium dioxide enterprises.

The invention belongs to the technical field of cigarette filter stick materials, and provides a biomimetic mineralization-based cigarette filter stick and a preparation method thereof.The cigarette filter stick is of a porous hierarchical composite structure guided in an interwoven fiber net shape, and raw materials comprise polysaccharide or modified polysaccharide, a polymer and inorganic salt, an organic framework of an interlaced fiber net structure constructed by polysaccharide or modified polysaccharide and a polymer attracts inorganic salt to be distributed along the organic framework, in-situ mineralization of the inorganic salt is induced to form inorganic mineral particles, and a porous layer is formed. The polymer comprises one or more of a polyester polymer, a polyamino acid polymer, a water-soluble polymer and an inorganic polymer; the inorganic salt comprises one or more of calcium phosphate, calcium silicate, silicate, calcium carbonate, carbonate and phosphate. The preparation process is mild and environmentally friendly, the method is suitable for large-scale application, functionalization and harm reduction of the cigarette filter stick can be achieved, and the prepared cigarette filter stick has good formability and mechanical stability.

The application belongs to the technical field of inorganic nonmetallic cementing material, and provides a phosphorus aluminum silicate inorganic polymer and a preparation method and application thereof.The phosphorus aluminum silicate inorganic polymer comprises the following preparation raw materials in parts by weight: 50-67 parts of precursor raw material, 33-50 parts of excitation agent, and water; the precursor raw material comprises metakaolin and active calcium oxide; the active calcium oxide accounts for 3-15% of the weight of the precursor raw material; and the excitation agent comprises a phosphoric acid solution.The phosphorus aluminum silicate inorganic polymer product obtained by the formula can not only meet the requirement that the pH value of the high-level waste geological disposal repository sealing material is less than 11, but also can effectively support fissures and broken rocks, and meet the use requirement of the high-level waste geological disposal repository sealing and reinforcing material.The addition of the active calcium oxide in the precursor raw material can significantly improve the working performance and compressive strength of the traditional acid-excited metakaolin-based inorganic polymer.

The application relates to the technical field of building material corrosion and rust prevention, in particular to an inorganic polymer reinforced concrete anticorrosive coating and a preparation method thereof. According to mass fractions, the inorganic polymer reinforced concrete anticorrosive coating comprises 60-70 parts of a base, 8-12 parts of an anti-cracking system, 10-15 parts of modified fillers, 5-8 parts of an additive and 15-20 parts of a solvent; the base is selected from alkali-activated metakaolin; and the preparation method of the modified fillers comprises the following steps: calcining composite fillers at 480-500 DEG C for 1.5-2 h, immersing the composite fillers in a 10wt% tannic acid solution for 10-12 h after cooling, immersing the composite fillers in a modified liquid after filtration, ultrasonic dispersing the composite fillers for 20-30 min, vacuum drying the composite fillers, crushing and sieving the composite fillers to obtain the modified fillers. The application provides an inorganic polymer reinforced concrete anticorrosive coating and a preparation method thereof, so as to solve the problems of large self-shrinkage, easy cracking and single function in the related art, and the coating can adapt to complex environments.

The invention discloses a ceramic nanofiber, a preparation method thereof and prepared ceramic aerogel, and the method for preparing the ceramic nanofiber comprises the following steps: 1) mixing and uniformly dispersing an inorganic precursor, a chelating agent, a solvent and a stabilizer to obtain mixed sol; 2) generating linear inorganic polymer sol with activity by controlling hydrolysis and condensation polymerization of an inorganic precursor in the mixed sol; (3) carrying out equilibrium concentration on the linear inorganic polymer sol so as to regulate the viscosity and viscoelasticity of the sol to be in a proper range; and 4) carrying out electrostatic spinning on the sol regulated in the step 3) to obtain precursor fibers, and calcining the precursor fibers to obtain the ceramic nanofibers.According to the method disclosed by the invention, the high-strength doubled ceramic nanofibers can be rapidly prepared, and the doubled ceramic nanofibers can be simply and conveniently assembled into a high-elasticity ceramic aerogel material.

The invention relates to the technical field of geotechnical engineering and building materials, in particular to an inorganic polymer soil stabilizer and a preparation method thereof. The inorganic high-molecular soil stabilizer is prepared from the following raw materials in parts by mass: 90 to 97 parts of a base material, 0.5 to 1.5 parts of NaCl, 2.5 to 3.5 parts of CaSiO3, 0.1 to 0.8 part of an inorganic high-molecular polymer A1 material and 0.8 to 1.2 parts of an inorganic high-molecular polymer B1 material. The curing agent adopts a pioneering inorganic polymer two-component system, a geopolymer three-dimensional network and C-S-H gel double cementation structure is formed through the synergistic effect of all the components, the strength of the soil curing agent reaches 1.8-2.1 MPa after the soil curing agent is used for 7 days, and the soil curing agent is suitable for conventional soil, can also adapt to soil with a high plasticity index and soil with high rock content, and has a wide application prospect. Good application prospects are realized in the fields of road engineering and the like.

The invention relates to the technical field of concrete admixtures, and particularly discloses an anti-crack inorganic polymer silicon-aluminum polymer admixture as well as a preparation method and application thereof. The method comprises the following steps: (1) adding an alkalizer and a co-stabilizer into an aluminum sulfate solution, and carrying out continuous stirring treatment under heating and heat preservation conditions to obtain a precursor solution; and (2) adding diethanolisopropanolamine into the precursor liquid, continuously stirring under the conditions of heating and heat preservation, standing the obtained reaction liquid to naturally precipitate, and taking the supernate after the reaction is completed. And (3) heating the supernate, adding fluosilicic acid under a stirring condition, and then preserving heat to obtain the admixture. The inorganic high-molecular silicon-aluminum polymer admixture obtained by the invention can be subjected to in-situ reaction with a large amount of Ca < 2 + > generated by hydration reaction at the early hardening stage of concrete to form a high-strength gelling product, so that the tensile strength of the concrete is improved, and the crack resistance of the concrete is improved.

This invention discloses a gold nanoparticle array sensor and its method for rapid identification and detection of multiple chromium species. The gold nanoparticle array sensor includes four probe units: gold nanoparticles modified with small molecule organic compounds containing amino and carboxyl groups, phosphorus-containing inorganic polymers, amino-containing cationic surfactants, and quaternary phosphine-containing cationic surfactants. When rapidly identifying and detecting multiple chromium species, this invention acquires fingerprint spectral information corresponding to different chromium species and uses hierarchical clustering analysis (HCA) and linear discriminant analysis (LDA) algorithms to identify single Cr(III), Cr(VI) ions, Cr(III)-organic complexes, or mixed samples. Simultaneously, it can also perform quantitative analysis of target analytes under low concentration conditions. The method for rapid identification of multiple chromium species using the gold nanoparticle array sensor of this invention has strong identification ability, simple operation, short detection time, high sensitivity, and high selectivity, providing a new approach for the analysis of multiple chromium species in industrial wastewater.

The invention belongs to the technical field of floor base materials, and particularly relates to a waterproof and moisture-proof polymer raised floor base material and a preparation method thereof. The waterproof and moisture-proof macromolecular raised floor base material comprises the following components in parts by mass: a magnesium oxysulfate base material: 40-60 parts of magnesium oxide, 20-30 parts of magnesium sulfate, 5-10 parts of alkali-resistant glass fabric, 3-8 parts of plant fiber and 2-6 parts of perlite; a polymer modified material: 1-3 parts of modified polypropylene fiber, 2-4 parts of polyvinyl alcohol, 3-5 parts of modified epoxy resin and 1-2 parts of polyurethane; 10-15 parts of an inorganic polymer rock solidification liquid, and 0.5-1.5 parts of a functional additive. The waterproof and moisture-proof polymer raised floor base material prepared by the invention has excellent waterproof and anti-aging effects.

The invention relates to a modified biological flocculant and application thereof in sludge and sewage treatment, and belongs to the technical field of water treatment. According to the flocculating agent, a CW biological flocculating agent is used as a matrix and is compounded with polyaluminum chloride (PAC) for modification, and the synergistic effect of the adsorption bridging effect of biological macromolecules and the charge neutralization effect of inorganic macromolecules is fully exerted, so that the solid-liquid separation efficiency is remarkably improved. Compared with the single use of PAC or CW, the modified biological flocculant provided by the invention shows higher treatment performance and better effluent quality in the aspects of sludge dewatering and sewage suspended matter removal, and can effectively reduce the dosage and the operation cost of the medicament at the same time. Application results show that the composite flocculant can reduce the water content of sludge to about 59% and reduce the concentration of suspended solids (SS) in sewage from 24.98 mg / L to 1.55 mg / L, and the removal rate reaches 93.9%. The flocculant is green and environment-friendly, has a good flocculation effect, is suitable for efficient treatment of municipal sewage, printing and dyeing wastewater and various industrial wastewater of petrifaction, medicine and the like, and has a good application and popularization prospect.

This invention provides a method for recovering rare earth elements from lutetium yttrium silicate crystal waste and its application. The method includes the following steps: mixing lutetium yttrium silicate crystal waste with an alkaline substance for alkali fusion, followed by water leaching and acid leaching to obtain an acid leaching solution; mixing the acid leaching solution with an inorganic polymer flocculant and an alkaline solution for preliminary desiliconization to obtain a first desiliconized solution; mixing the first desiliconized solution with a phosphorus-based extractant for extraction to remove impurities, obtaining an extract and a raffinate; performing deep desiliconization on the raffinate using resin adsorption or heteropolyacid extraction to obtain a second desiliconized solution; mixing the second desiliconized solution with a precipitant solution for precipitation to obtain a precipitate product, and then calcining the precipitate product to obtain rare earth oxides. This method can reduce the silicon content to below 1 mg / L, comprehensively recover rare earth elements such as Y and Lu, effectively reduce acid and alkali consumption, improve the comprehensive utilization rate of waste materials, and increase economic benefits.

The utility model discloses an inorganic polymer composite profile production line mold replacing device which comprises a fixed supporting plate, side supporting plates are symmetrically and fixedly connected to the two ends of the side face of the fixed supporting plate, and movable supporting plates are arranged on the side faces of the side supporting plates. By adjusting the up-down position of the long screw rod and combining the sliding of the rolling bearing in the V-shaped guide rail, the device can quickly adapt to the production requirements of different sizes, the mold adjusting time is greatly shortened, the flexibility and efficiency of a production line are improved, and meanwhile, the production cost is reduced by reducing the mold replacement frequency and complexity. Compared with the prior art, maintenance cost and replacement cost of the die are greatly reduced, the drawing process of the die is smoother through the internal size-adjustable design, friction and collision among parts are reduced through the design, and therefore resistance and abrasion generated when the die is drawn are reduced, and the service life of the die is prolonged.

The invention relates to the technical field of sewage treatment, and provides a slaughter house sewage treatment method and a water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent is prepared from, by weight, 40-50 parts of chitosan, 20-40 parts of activated carbon, 18-26 parts of sodium polystyrenesulfonate, 4-18 parts of polyethyleneimine and 15-25 parts of inorganic polymeric flocculant. By means of the technical scheme, the problem that in the prior art, a water treatment agent is poor in removal effect on CODcr and animal fat in slaughter house sewage is solved.

The shell of the pressure cooker controller comprises a shell body, a first through hole is formed in the surface of the shell body, second through holes are formed in the upper end and the lower end of the shell body, a third through hole is formed in the surface of the shell body, and a protective layer is sprayed on the outer surface of the shell body. The left side of the protective layer is sprayed with a high-temperature-resistant layer, the high-temperature-resistant layer comprises a borosilicate glass layer, a phosphate lead powder layer and an organic silicon ceramic glass layer, the right side of the protective layer is sprayed with a wear-resistant layer, and the wear-resistant layer comprises an inorganic polymer layer, an epoxy resin adhesive layer and an ionic compound layer. According to the utility model, the surface of the housing body is provided with the third through hole, the outer surface of the housing body is coated with the protective layer, the left side of the protective layer is coated with the high-temperature-resistant layer, and the high-temperature-resistant layer comprises the borosilicate glass layer, the phosphate lead powder layer and the organic silicon ceramic glass layer, so that the high-temperature-resistant effect is achieved, and the erosion of hot air can be prevented.

The present application relates to sewage treatment technical field, propose a kind of slaughterhouse sewage treatment method and water treatment agent, water treatment agent, raw material includes the following weight parts component: chitosan 40~50 parts, activated carbon 20~40 parts, polystyrene sodium sulfonate 18~26 parts, polyethylene imine 4~18 parts, inorganic polymer flocculants 15~25 parts.Through above technical scheme, solve the problem of poor removal effect of water treatment agent in related art on CODcr and animal fat in slaughterhouse sewage.

The invention relates to a composite phosphorus removal agent as well as a preparation method and application thereof. The composite phosphorus removal agent comprises 45wt%-75wt% of a modified inorganic high-molecular coagulant, 2wt%-15wt% of a modified natural high-molecular polymer, 5wt%-40wt% of inorganic salt, 0.5 wt%-5wt% of a coagulant aid and 0.1 wt%-0.5 wt% of a solvent, wherein the modified inorganic polymer coagulant comprises modified polyaluminum chloride and / or modified polyaluminum ferric chloride; the basicity of the modified inorganic polymer coagulant is 40-85 wt%; the modified natural high-molecular polymer is prepared from one or more of a dimethyl diallyl ammonium chloride-acrylamide-modified starch copolymer and a methacryloyloxyethyl trimethyl ammonium chloride-acrylamide-modified starch copolymer; the relative molecular mass of the modified natural high-molecular polymer is 50-450 million. The composite water purifying agent disclosed by the invention is low in cost and simple in production and preparation method, does not introduce excessive metal salts, does not cause secondary pollution and does not cause excessive metal in a water body, and has a better effect of removing phosphorus and turbidity under the condition of low water temperature.