395results about How to "Regulatory performance" patented technology

Production of polyether graft poly-carboxylic acid concrete water reducer is prepared by sulfonating styrene-anhydride multipolymer with anhydride content 10í½50 mol% and relative molecular mass 2000í½20000 from sulfonating agent of non-destructive acid anhydride group, esterifying grafting polyether side chain on acid anhydride key, and dissolving in water. Its advantages include simple process, no catalyst, higher fluidity of cement concrete and compression strength.

The invention relates to a preparation method of a zinc oxide varister, comprising two independent steps: preparing zinc oxide granules with doping ion components; and preparing a sintering material for coating the zinc oxide granules. According to the performance requirement of the varister, the doping components of the zinc oxide granules, the components of the high-impedance sintering material and preparation conditions are prepared in advance; finally, the zinc oxide granules and the high-impedance sintering material are evenly mixed according to a certain proportion, and the zinc oxide varister is prepared according to the conventional technology. The zinc oxide varister prepared by the preparation method not only has voltage-sensitive performance, but also has one or more functions of heat sensitivity, capacitance, inductance, piezoelectricity or magnetic characteristic, and the like, can sinter at low temperature (lower than 900 DEG C) and can use fine silver as an inner electrode.

The invention discloses a method for providing large concurrent processing and flow control for mobile phone client sides, and the method is applied to interaction between the mobile phone client sides and a server cluster. The method includes the steps that step1, the mobile phone client sides send connection requests to an access server in a server cluster, a DNS gets access to the server in a dispatching mode, the DNS and the access server carry out delay detection, when a detected delay is smaller than a strategy parameter, a UDP is adopted for communication of the client sides and the access server, and otherwise, a TCP is used for the communication; step2, the access server receives the requests of the mobile phone client sides and controls the quantity of concurrent requests, if the number of the concurrent requests is larger than a preset value, connection is rejected, and if not, the requests are distributed to a service processing server with the fewest loads; step3, the service processing server receives the service requests distributed by the access server, sorts the service requests according to logging, logout, heartbeat, data collection and page requesting, and then respectively carries out processing according to sorted types of the service requests.

The invention discloses a polycarboxylic retarding high-performance water reducing agent used for preparing concrete of middle and low strength grade. According to the weight percentage of the effective solid content, the water reducing agent comprises 9-15% of low air-entrained mother liquor, 0.5-3.0% of retarder, 0.01-0.03% of foam stabilizer, 0.03-0.10% of air-entraining agent, 0.02-0.08% of thickener, 0.05-0.20% of activator and the balance of water. The preparation method comprises the following steps of: weighing all compositions by the weight percentage of each effective solid content, putting and slowly mixing the compositions in a reaction kettle for 10-30min, thus obtaining the concrete. By adjusting the proportion of all compositions, the polycarboxylic retarding high-performance water reducing agent can meet the usage requirements of the concrete of middle and low strength grade (C15-C40), has the advantages of wide doping range, high water reducing ratio, good retarding effect, low chlorine and alkali content, low concrete shrinkage ratio, greenness, environmental protection and the like, and can prepare the green and economic high-performance concrete.

The invention relates to a graphene oxide size grading method. The method includes the steps of: 1) dispersing a graphene material in a solvent to obtain a graphene material dispersion liquid; 2) under the condition of an externally applied force, passing the graphene material dispersion liquid through a porous membrane to obtain filtrate and trapped fluid, and conducting separation to obtain graphene materials with different size ranges. Based on the correlation of graphene material size and separation membrane pore size, the method disturbs the graphene material solution to prevent pore channel blockage, and realizes physical one-step method size grading of the graphene material (e.g. graphene oxide). By selecting multiple pore sizes and separation number of times, the graphene material can be separated into a lot of grades according to size. The one-step method for size grading of graphene material is simple, effective, cheap and environment-friendly, and can be used on a large scale. At the same time, the filter membrane for separation can be used repeatedly, thus saving cost.

The invention discloses a hydrophobically associating polymer, a preparation method and an application thereof. The hydrophobically associating polymer is shown as formula I, wherein x is 0.001-0.01, y is 0.7-1.0 and X is C1, Br or I. The preparation method comprises the steps of uniformly mixing acrylic acid, acrylamide, hydrophobic monomer, light initiator and ethylene diamine tetraacetic acid in deionized water, allowing reaction in illumination conditions; and after reaction, obtaining the polymer. The invention adopts ultraviolet-induced polymerization, so that the total activation energy is low and the reaction can be performed at low temperature; the product has better repeatability and the product quality is more stable; the polymerization can be controlled by powering on and powering off, at the same time the performance of the hydrophobically associating polymer can be controlled by controlling illumination time and light source strength. The polymer of the invention shows better dissolubility and viscosity in water and can form a space network structure in the solution.

A centrifugal pump impeller comprises an impeller disc and a plurality of blades. A round groove is formed in the middle of the impeller disc, a round ring with teeth on one inner side face is placed in an annular groove, one side with the teeth of the inner side face of the round ring is meshed with a small gear, screw holes identical in number are uniformly distributed on the round ring and at the edge of the impeller disc, two holes are arranged at two ends of each blade, and one end of each blade is fixed on the impeller disc while the other end of the same is fixed on the round ring with the teeth on the inner side face. Each blade can extend and contract but cannot disjoint. The round ring can be rotated by rotating the small gear, and then length of each blade can be changed, and mounting angle of each blade at an impeller inlet and an impeller outlet can be changed. The centrifugal pump impeller has the advantages that the blades of a centrifugal pump can be adjusted, so that performance of the centrifugal pump can be adjusted.

The invention discloses ecological PVC decorative artificial leather and a preparation method thereof. The artificial leather is prepared from ecological PVC pulp by adopting a calendaring method, wherein the ecological PVC pulp is prepared from the following components in part by weight: 100 parts of PVC resin powder, 40 to 80 parts of epoxy soybean oil, 2 to 10 parts of non-heavy metal color cake, 3 to 7 parts of stabilizer and foaming agent and 20 to 40 parts of shell powder. The artificial leather of the invention not only has good mechanical property, but also has higher folding strength and ageing resistance; and the leather also has the effects of adsorbing formaldehyde, decomposing the formaldehyde and adjusting air temperature.

The invention discloses a nitrile resin monomer, a nitrile resin polymer and a preparation method of the nitrile resin monomer and the nitrile resin polymer, belonging to the technical field of organic polymer materials. The nitrile resin monomer is a tetraphthalonitrile resin monomer containing benzoxazine cycle, and the nitrile resin polymer is a product obtained by heating polymerization of the nitrile resin monomer. The nitrile resin monomer has a low viscosity, a good mobility and the processing performances of low-temperature curing and the like at a low temperature. The nitrile resin polymer has the good curing performances of self-flame resistance, adhesion, heat stability and the like. The resin monomer has the good processing performances of benzoxazine resins, and the resin polymer has the high-temperature resistance of nitrile resins, thus reducing the curing processing temperature and being capable of being used in a high-temperature temperature, namely, having the advantages of low temperature processing, medium temperature formation and high temperature use; and the resin monomer and the resin polymer can be used in the fields of coatings, adhesives, electronic packaging materials, aeronautics, astronautics, ships, resin matrix composites and the like. The preparation method is simple and easy to control, low in reaction temperature, energy-saving, and suitable for industrialized production.

The precent invention discloses a poly-o-phthalonitrile resin and a preparetion method. After the solution blending, fusion blending or physical blending of 1 to 99 percent of o-phthalonitrile derivative with amino group or hydroxyl group and 1 to 99 percent of polyethernitrile with amino group or hydroxyl group, or 1 to 99percent of o-phthalonitrile derivative with amino group or hydroxyl group and 1 to 99 percent of o-phthalonitrile derivative, or 1 to 99 percent of polyethernitrile with amino group or hydroxyl group and 1 to 99 percent of o-phthalonitrile derivative, or 1 to 98 percent of o-phthalonitrile derivative with amino group or hydroxyl group, 1 to 98 percent of polyethernitrile with amino group or hydroxyl group and one to ninety eight percent of o-phthalonitrile derivative, the compound is solidified, so that the poly-o-phthalonitrile resin is prepared. Because the invention uses the o-phthalonitrile derivative with amino group or hydroxyl group or / and the polyethernitrile to prepare the poly-o-phthalonitrile resin, the performance of the resin can be regulated and controlled in a wide range, and the tenacity of the poly-o-phthalonitrile resin can also be increased, thus broadening the application field of the resin. The invention also has the advantages of simple steps and low cost.

The invention discloses a two-layer micrometering bolometer and a manufacturing method thereof. The two-layer micrometering bolometer comprises a microbridge structure for a micrometering bolometer of an uncooled infrared detector or an uncooled terahertz detector, and is characterized in that: the microbridge consists of two independent bridge decks, namely an upper bridge deck and a lower bridge deck; a light absorbing material is positioned on the upper bridge deck; a thermistor material is positioned on the lower bridge deck; and four upper and lower bridge deck connecting posts on the upper bridge deck of the microbridge are connected with a metal heat transfer layer of the lower bridge deck of the microbridge. The upper bridge deck of the microbridge comprises one or more layers of light absorbing materials. The two-layer microbridge has higher light absorption rate and filling factor, and also has higher temperature uniformity and mechanical stability. The two-layer micrometering bolometer and the manufacturing method thereof can overcome the defects in the prior art, the working performance of a device is improved, and the two-layer micrometering bolometer is suitable for large-scale industrial production.

The invention relates to a PEAK (polyaryletherketone) polymer with a POSS (polysilsesquioxane) structure and a preparation method and belongs to the field of high polymer materials. The PEAK polymer containing carboxyl and fluorine is prepared by introducing a carboxyl structure into a fluorine-containing PEAK main chain structure through nucleophilic substitution. The polymer has excellent heat stability, good dissolving property and lower dielectric constant. Further, POSS containing hydroxyl functional groups is grafted to a fluorine-containing PEAK side chain structure through Friedel Crafts acylation reaction, so that characteristics of POSS and fluorine-containing PEAK are organically combined, the dielectric constant of a material is further reduced, the heat resistance of the material is improved, and different using requirement are met.

The invention provides a composite structure based on metamaterials and semiconductor low dimension quantum materials. The composite structure based on the metamaterials and the semiconductor low dimension quantum materials is composed of a substrate (1), a buffer layer (2), the semiconductor low dimension quantum materials (3), semiconductor interlayer materials (4) and the metamaterials (5). The metamaterials (5) is in the structure of cycle-assigned metal wire arrays, cycle-assigned metal opening resonance ring arrays or a fishing net. The thickness of the semiconductor interlayer materials (4) is 5 to 50 nanometers. According to the composite structure based on the metamaterials and the semiconductor low dimension quantum materials, a light gain property of the semiconductor low dimension quantum materials and a high speed response property of semiconductor materials to a light signal are simultaneously used, and the composite structure based on the metamaterials and the semiconductor low dimension quantum materials has the dual functions of compensating metamaterial wastage and regulating and controlling metamaterial properties. Under the condition that control light or pump light is additionally arranged, according to the composite structure based on the metamaterials and the semiconductor low dimension quantum materials, the functions of full light opening and closing or full light wavelength conversion can be achieved, and the composite structure based on the metamaterials and the semiconductor low dimension quantum materials has the advantage of being large in extinction ratio.

The invention discloses a force-induced response dynamic polymer. The polymer chain skeleton contains at least one force-sensitive group and at least one boron-free dynamic covalent bond, optionally contains at least one boron-containing dynamic covalent bond, and also optionally contains at least one supramolecular interaction; and under the action of mechanical force, the force-sensitive group in the dynamic polymer is subjected to chemical and / or physical change to realize force-induced response. According to the dynamic polymer, the force-sensitive group with a force-induced response characteristic, the boron-free dynamic covalent bonds with different dynamic properties, the optional boron-containing dynamic covalent bond and the supramolecular interaction are introduced, so that the force-induced response dynamic polymer material with a wide controllable range, a rich structure and various properties can be prepared. The force-induced response dynamic polymer can be widely appliedas a functional coating with a force-induced response function, a self-repairing material, an energy storage device material, an energy absorbing material, a photoelectric device material, a mechanical probe and the like.

The invention provides nickel-copper alloy liquid for chemical plating and electroplating. The nickel-copper alloy liquid for the chemical plating and the electroplating comprises 1-10g / L of copper salt, 20-60g / L of nickel salt, 10-20g / L of complexing agent and 1-10g / L of reducing agent by taking deionized water as a solvent. By using the nickel-copper alloy liquid, a nickel-copper alloy composite coating is prepared on the surface of a metal base by adopting a method of chemical plating and electroplating synergetic deposition. The coating not only is of a nanocrystalline structure but also is of a noncrystalline structure, and moreover, nanocrystallines are evenly distributed in a noncrystalline continuous phase. The coating is a nickel-copper alloy noncrystalline-based composite coating. The nickel-copper alloy noncrystalline-based composite coating has the properties of the noncrystalline structure and the crystalline structure, thus, the combination property of the coating is obviously improved, such as corrosion resistance, wear resistance, high strength, high hardness and excellent room-temperature ductility, and the application range of a metal matrix is greatly broadened.

The invention provides a metal or metal oxide loaded nano ordered mesoporous carbon material. The nano ordered mesoporous carbon material has the spherical appearance with the diameter of 100-300nm, the specific surface area is 500-600m<2> / g, and the pore diameter is 15-20nm. The invention also provides the preparation method of the material. A soft template method is used, firstly, a carbon precursor with a surface active agent is synthesized, then, by virtue of hydrothermal reaction and roasting, the surface active agent of the carbon precursor is removed, and the metal or metal oxide loaded spherical nano ordered mesoporous material is obtained. The method can realize loading of various different metal components, can be used for effectively regulating the material performance, and is expected to expand the use of the nano ordered mesoporous carbon material. The nano ordered mesoporous carbon material synthesized by the invention is consistent in shape and controllable in size, the metal nano constituents are distributed uniformly, operations are simple in preparation process, and the requirement on equipment is low, so that the nano ordered mesoporous carbon material has industrial practicability.

The invention relates to a preparation method of a hybrid graphene gel / phase-change heat-conducting composite material. The preparation method comprises the following steps that 1, graphite oxide is taken and dispersed in water and is prepared into an oxidized graphene solution; 2, the oxidized graphene solution obtained in the step 1 is put in a reaction kettle, and hydrothermal reaction and drying are performed to obtain graphene gel; 3, then a solid-liquid organic phase-change material and the graphene gel prepared in the step 2 are put under vacuum condition, heating is performed to remove excessive solid-liquid organic phase-change material, and cooling is performed to obtain the graphene gel / phase-change heat-conducting composite material. Compared with the prior art, the prepared composite material has excellent thermal conductivity, electrical conductivity and thermal stability, the problems of low thermal conductivity, electrical insulation and the like of phase-change energy storage materials existing in the prior art are solved, and the preparation method is simple, low in cost, good in repeatability and the like.

The invention discloses star-shaped hydroxyl polyester adopting polyhydric alcoho as a nucleus and a preparation method and an application of the star-shaped hydroxyl polyester. The preparation method comprises the following steps: enabling 1 to 8 molar caprolactone and 1 to 4 molar anhydride to react for 6 to 10 h at 80 to 140 DEG C by adopting 1 molar small molecular polylasic alcohol as a core molecule to obtain a matrix star-shaped polyester, then reacting with 1 to 4 molar monoglycidyl ether at 90 to 150 DEG C to obtain star-shaped hydroxyl polyester. The prepared star-shaped hydroxyl polyester has the advantages of simple synthesis process, high solid content and low viscosity, a hydroxyl value is 140 to 250 mg KOH / g (80 percent of solid content), the viscosity at 25 DEG C when the solid content is 80 percent is 300 to 3000cp, the star-shaped hydroxyl polyester can be cross-linked with a polyurethane curing agent containing an isocyanate group and can be used for preparing a coating with a high solid content, the VOC content at the construction viscosity is smaller than 380 g / L, and the film performance can satisfy the national standard of the solvent-type dual-component polyurethane wood coatings.

The invention belongs to the technical field of 4D printing additive manufacturing, and discloses a 4D printing method of a nickel-titanium-based ternary shape memory alloy. The 4D printing method ischaracterized in that a selective laser melting technology is adopted for printing gas atomized prefabricated NiTiZr ternary alloy powder, and a component obtained through printing has the shape memory function; and the laser energy density is changed by changing the technological parameters adopted in the selective laser melting technology, and therefore the changes of the structure and performance of the printed piece are regulated and controlled. According to the 4D printing method, the ternary component Zr is introduced into an existing nickel-titanium binary alloy, the martensite phase transformation temperature is obviously increased, the selective laser melting technology is adopted for forming, and complex parts uniform in structure and high in density can be obtained while the excellent shape memory performance and mechanical performance are guaranteed.

The invention discloses application of an organic silicon modifier in modified thermosetting phenolic resin. The organic silicon modifier is easy to prepare, and a phenolic resin system modified by the organic silicon modifier is high in uniformity and stable in quality. The thermosetting phenolic resin can be prepared from phenol, formaldehyde solution and the organic silicon modifier serving as raw materials by alkali catalytic condensation. The thermosetting phenolic resin is structurally characterized in that polydimethylsiloxane chain segments are chemically bonded to phenolic resin molecules. The prepared modified phenolic resin is difficult to moisturize; the toughness and the heat resistance of the solidified material are excellent; the toughness of a material prepared when the modified phenolic resin is applied to an impregnated material is superior to that of a common phenolic resin product; and the modified phenolic resin can be used as adhesive for preparing composite materials such as high-performance friction materials, and can effectively improve the shearing strength of an adhered position and avoid degumming.

The invention discloses a method for synthesizing a highly directional nano flake Bi2Fe4O9 crystal at a low temperature. The method mainly adopts the hydrothermal preparation method and comprises the following steps that: Bi(NO3)3.5H2O and Fe(NO3)3.9H2O with the same mol ration are dissolved in a dilute nitric acid, a sodium hydrate aqueous solution is titrated into the mixed solution until the precipitation is complete, and the mixture is filtered and washed by water until the solution is neutral. The method is characterized in that the obtained precipitation is dissolved in a sodium hydrate aqueous solution with a concentration of between 8 and 20 mol per liter, 2 milliliters of H2O2 solution against 40 milliliters of the H2O2 solution are added, the mixture is put in a reaction kettle and reacts for 12 to 72 hours at a temperature of between 160 and 200 DEG C, the product is washed by de-ionized water and alcohol and is dried in an oven, and the obtained final product is the directionally growing nano flake Bi2Fe4O9.

The invention relates to a graphene, aluminum and silicon carbide composite material and a preparation method thereof. The composite material is prepared from of constituents of 10-40 vol% of silicon carbide, 0.5-2 wt% of graphene, and the balance aluminum alloy. The composite material is prepared through a powder metallurgic method and can be obtained through proportioning, powder mixing, packaging, vacuum degassing and hot isostatic forming. The composite material has the advantages of low density, low weight, high hardness, high tensile strength and the like, the strength, fatigue resistance and toughness of the material are remarkably improved through addition of a proper amount of graphene, and thus the composite material has broader application prospects in the field of structural pieces.

A titanium alloy equal-thickness thin-wall special-shaped annular piece rolling and expanding composite forming method comprises the processes of workblank design, upsetting and punching, thin-wall annular piece rolling, rigid mold bulging, finish machining and titanium alloy thin-wall special-shaped annular piece. The whole flow mainly depends on material plastic forming; oxide skin externally wrapping the annular piece is only removed by cutting and removing working allowance in the final process, so that the performance of the annular piece is ensured, and the cost is saved. When the special-shaped annular piece is finally formed, rigid mold bulging is adopted, and the final geometrical shape and dimension of the annular piece are ensured by a mold, so that the precision is very high; and the consistence of dimension and precision of a part can be ensured when multiple processing is continuously carried out.

The invention provides a low-density fly-ash ceramsite proppant and a preparation method thereof, belongs to the technical field of preparation of inorganic materials, and solves the technical problems that in the preparation process of a conventional proppant, material composition or the sintering temperature cannot be accurately controlled, and the processing property cannot be effectively improved. The low-density fly-ash ceramsite proppant is characterized by comprising an inner core and an outer shell, wherein the inner core comprises 50-89% of bauxite, 8-45% of fly ash, 1-6% of manganese mineral powder and 0-5% of a flux and is 180-250 [mu]m in diameter; the outer shell comprises 50-89% of bauxite, 8-45% of fly ash, 1-6% of manganese mineral powder and 1-5% of dolomite and is 380-830 [mu]m in diameter. The low-density fly-ash ceramsite proppant has the advantages that the performance is excellent, the technological process is simple, and the operation is convenient.

The invention discloses a method for preparing porous ceramics in the technical field of inorganic nonmetallic materials. The porous ceramics are prepared by taking the hollow ceramic ball as a pore forming agent and using a gel casting process. The method comprises the steps: firstly, presintering the hollow ceramic ball; then, preparing low-viscosity ceramic slurry and degassing; placing the presintered hollow ceramic ball into the prepared ceramic slurry; uniformly stirring the slurry and degassing again; then, adding tetramethylethylenediamine and an aqueous solution of ammonium persulfate; carrying out injection molding after uniformly stirring the mixture; next, placing a slurry injected mold into a drying oven to heat; demolding after the slurry is completely cured, and carrying out drying, glue ejection, sintering and other processes to finally prepare the novel porous ceramics. The porous ceramics prepared by the invention are favorable in mechanical property, controllable in pore diameter distribution and uniform in air hole distribution; in addition, the adverse effects of the traditional pore forming agent on a blank body during burning can be avoided, the shrinkage and deformation of various prepared porous ceramics can be effectively inhibited, and the comprehensive performances of the prepared porous ceramics can also be effectively controlled.

The invention relates to a method for modifying a photocatalyst TiO2 by using WO3 and a rare earth metal element La. The method comprises the following steps: dispersing a precursor tetrabutyl titanate into a solvent absolute ethyl alcohol, performing a hydrolysis reaction to obtain nanometer TiO2 particles, and introducing a semiconductor material WO3 and a rare earth metal element La in a reaction process, wherein the mol ratio of the Ti:WO3:La is 100:(0-10):(1-6), and the WO3-La / TiO2 nanometer compound photocatalyst is uniform in size, better in dispersity, free from toxicity and secondary pollution, low in price of raw materials and stable in source, simple in synthesis process without secondary pollution, low in price and stable in source of raw materials, simple in synthesis process without pollution, excellent in performance, and wide in application range, can be repeatedly used, can be conveniently prepared into a powdery coating or other types of green environmental-friendly material, is applied to pollution removal and purification of various environments, and has a wide practical application value in the aspect of preparation of a photoelectric material or photocatalysis material.

The invention discloses a phenylboronic acid based hydrogel and a preparation method thereof. The hydrogel is obtained by free radical copolymerization of a vinylated functional phenylboronic acid based vinyl monomer and a vinyl monomer. Proportions of raw materials are as follows, in parts by mass: 45-100 parts of water; 0.2-2 parts of a functional monomer; 10-50 parts of a main monomer; 0-0.5 part of a crosslinking agent; and 0.01-0.1 part of an initiator. A free radical copolymerization is initiated by heating: the heating temperature is 45-80 DEG C, and the heating time is 4-48h. According to the invention, the phenylboronic acid based hydrogel is prepared by the free radical copolymerization method, the method is simple, and through changing a hydrogel preparation component content, the method can adjust and control hydrogel performance; the obtained hydrogel has excellent mechanical properties under a relatively low solid content, and has the characteristics of being highly stretchable, having good resilience, having good fatigue resistance and the like; and the obtained hydrogel has stimuli-responsiveness to a glucose concentration and pH.

The invention belongs to the technical field of olefin polymerization, and discloses a novel complex containing o-benzhydryl substituted alpha-diimine nickel used for fluorination of ethylene polymerization. Large-steric-hindrance benzhydryl and an F group are led to the ortho-position of phenyl of a catalyst, so that a coordination environment (steric hindrance and electronic density) of a metalcenter is changed; under activation of a co-catalyst MAO, catalytic activity, polymer molecular weight and a micro branched structure can be effectively controlled. The complex catalytic ethylene polymerization has relatively high heat stability; and high-molecular-weight low-branching-degree polyethylene is obtained.

The invention discloses a force-responsive polymer foam particle and a preparation method thereof; under the action of mechanical force, force-sensitive groups and / or force-responsive components in the force-responsive polymer foam particle undergo chemical and / or physical changes, so that the foam particles form force response. In the polymer foam particle, a force-sensitive group / force responsecomponent with a force response characteristic is introduced, so that a force-responsive foam product with a wide controllable range, and a rich structure and various performances can be prepared. Theforce response polymer foam particle can be used for producing foam packaging materials, impact-resistant protective materials, damping materials, buffer materials, silencing materials, thermal insulation materials and the like with a force response function so as to be widely applied.

The present invention discloses a visible-light-responsive BiVO4 / TiO2 / graphene tri-material composite light catalyst and a preparation method thereof. The preparation method comprises the steps of (1) preparing a suspension system A containing BiVO4 nano particles, and a suspension system B containing a TiO2 sol-gel and graphene oxide; (2) proportionally mixing up the suspension system A and the suspension system B, conducting the heating treatment, separating and drying to obtain a BiVO4 / TiO2 / graphene oxide composite material; (3) suspending the BiVO4 / TiO2 / graphene oxide composite material in short-chain alcohol, adding a reducing agent, conducting the hydrothermal reaction and drying to obtain the visible-light-responsive BiVO4 / TiO2 / graphene tri-material composite light catalyst. The preparation method is simple and easy to operate, and low in cost. Based on the preparation method, the structure and the properties of the composite light catalyst can be regulated and controlled through simply changing the conditions of reactions and heat treatments.