73results about How to "Can be industrially mass-produced" patented technology

The present invention relates to a kind of high molecular solid / solid phase changing material with mixed net and comb structure, and features that polyglycol with two active end radical and polyglycol with one active end radical are fixed onto the high molecular skeleton material to form 3D mixed net and comb structure. The material of the present invention has relatively great phase change enthalpy up to 120 J / g, proper phase change temperature capable of being altered in 0-65 deg.c, stable solid state before and after phase change without supercooling, separating and other unstable phenomenon, high mechanical strength, high solvent resistance, good machining performance, no toxicity, no leakage, no corrosion, no pollution, long service life and other advantages. The present invention may be used widely in solar energy utilization, afterheat recovering, intelligent air conditioner and other fields.

The invention discloses graphene composite conductive ink for ink-jet printing and a preparation method thereof. The graphene composite conductive ink comprises the following ingredients (by weight): 1-30 parts of graphene, 0.1-15 parts of multi-walled carbon nanotube, 0-7.5 parts of conductive carbon black, 290-320 parts of a mixed solvent, 0.2-10 parts of a surfactant, and 0.2-15 parts of a binder. The preparation technology is simple and feasible. According to the preparation technology, a series of steps that are hard to operate, such as tedious covalent modification, dipolar addition reaction, diazonium salt coupling, solvent exchange, etc. in the prior art are omitted; but by direct one-step grinding and mixing, the surface of a conductive filler is coated with the surfactant to prepare graphene ink with good dispersion. No poisonous reagents are used during the preparation process. The preparation method is suitable for industrial large-scale production.

An apparatus for preparing WO3 nanoparticles is composed of liquid material delivering unit, ultrasonic atomizer, microwave generator, and power collector. Its preparing process includes such steps as ultrasonic atmozing of ammonium tungstate solution, delivering while predrying, microwave drying, and thermodecomposing of ammonium tungstate to obtain WO3 nanoparticles.

The invention aims at providing a preparation method of preparing a poly aluminum chloride flocculant and a poly aluminum silicate chloride flocculant simultaneously. The method comprises the steps of adding water into calcium aluminate powder for mixing to prepare a suspension, continuing mixing, adding appropriate amount of silicon tetrachloride or / and silicon tetrachloride raffinate, adding appropriate amount of water to completely hydrolyze silicon tetrachloride in the silicon tetrachloride raffinate, controlling the temperature of a reaction system at 85-105 DEG C for reaction for 4-6h, performing curing treatment after the reaction to layer liquid, and obtaining the poly aluminum chloride liquid flocculant and the poly aluminum silicate chloride liquid flocculant. The method takes the silicon tetrachloride raffinate generated in a polysilicon production process as a raw material for the first time, utilizes a specific technical sequence and technological parameters, makes full use of the silicon tetrachloride raffinate, promotes healthy development of a polysilicon enterprise, prepares the poly aluminum chloride flocculant and the poly aluminum silicate chloride flocculant simultaneously, and has excellent economic benefits.

The invention belongs to the field of textile materials and discloses a micron fiber three-dimensional framework / polymer nanofiber composite filter material and a preparation method thereof. The preparation method comprises the following steps: preparing polymer nanofibers by adopting a melt blending method; dispersing the polymer nanofibers and a crosslinking agent into a solvent to form a suspension, then soaking micron fiber nonwoven fabric skeletons into the suspension, carrying out freeze drying to form coagulation blocks, and then removing the solvent, so that a nonwoven material with polymer nanofiber aerogel gradiently distributed among the micron fiber nonwoven fabric skeletons is obtained. According to the invention, the adopted preparation technology is simple, raw materials are environment-friendly, conditions are mild, the composite filter material is applicable to industrialized mass production, and the composite filter material product has good flexibility as well as high efficiency and low resistance air filtration performance and can be applied to the field of efficient air purification.

The invention provides a method for preparing functional grease and active protein powder from abelmoschus manilhot. The method comprises the following steps: washing abelmoschus manilhot seeds, drying, peeling, and pressing the seeds into a mould; subjecting the seed mould to a sub-critical extraction treatment, separating the solid-liquid phases after the extraction to obtain solid wet meal and a mixed solution; subjecting the mixed solution to an evaporation treatment to remove the extractant to obtain a grease solution; further subjecting the grease solution to molecular steaming refinement to obtain functional grease with an acid value of 0.21 to 0.23 mg / g; removing residual solvent on the solid wet meal which is separated out after the extraction, drying the meal at a low temperature, grinding, and sieving with a 60-mesh sieve so as to obtain the active protein powder. The provided method omits the tedious processes in the conventional grease refining technology such as deacidification, decoloring, and deodorizing through various chemical or physical processes, and has the advantages of short process procedure and high efficiency. The refined oil acid value is 0.21 to 0.23 mg / g after molecular distillation, and reaches the national A-grade edible oil standard. Furthermore, the obtained active protein powder is not processed at a high temperature, and is not modified, so the active protein powder is a high quality raw material for preparing foods with a high protein content.

The invention discloses salted old chicken. A making method of the salted old chicken comprises the following steps of 1, raw material selection and treatment, 2, stir-frying with table salt, 3, dry-curing, 4, brine preparation, 5, salting with the brine, 6, air-curing, 7, blanching and leaching, 8, boiling for cooking, 9, cooling and packaging, 10, vacuum sealing, 11, sterilization, 12, splat cooling and 13, external packing. Through the above processes, 1 to 1.5 years old of old chicken is processed and has a fresh, fragrant, crisp and tender taste of handmade salted old chicken. The salted old chicken is suitable for large-scale industrial production and creates a novel approach for deep-processing of chickens and making of a chicken food having a novel taste.

The invention provides a high-strength durable wood I-typed beam which has the advantages of high rigidity, lightweight, high-strength, convenient assembly and disassembly, easy cutting, high cost performance, high durability, turnover use for an average year, and industrialized production. The high-strength durable wood I-typed beam comprises a flange girth, a web plate and an end protective sleeve. The upper surface, lower surface and the interior of a flange girth substrate in the flange girth are provided with flange girth modified processing single plates. The surface and the interior of a web plate substrate in the web plate are provided with web plate modified processing single plates. The flange girth modified processing single plates and the web plate modified processing single plates are glue soaking processing single plates. The used adhesive selects water soluble phenol resin with low molecular weight or melamine-formaldehyde resin. The high-strength durable wood I-typed beam is mainly used as the supporter in a building moulding board system, and can also be used in the fields such as supporting members of building structure roofs, and the like.

The invention discloses salted duck's gizzard. A making method of the salted duck's gizzard comprises the following steps of 1, raw material selection and treatment, 2, stir-frying with table salt, 3, dry-curing, 4, brine preparation, 5, salting with the brine, 6, air-curing, 7, blanching and leaching, 8, boiling for cooking, 9, cooling and packaging, 10, vacuum sealing, 11, sterilization, 12, splat cooling and 13, external packing. The making method does not adopt any antiseptics, chemical pigments and chemical perfumes, produces the salted old duck's gizzard having a unique taste, and increases the number of types of packaged duck's gizzard leisure foods. The salted duck's gizzard has a unique fragrance and a delicious taste, is suitable for large-scale industrial production and creates a novel approach for deep-processing of duck's gizzard and making of a duck's gizzard food having a novel taste.

The invention discloses a preparation method of calcium amino acid chelate and belongs to the technical field of food processing. According to the method, a hydrochloric acid solution is used for soaking egg shells, the hydrochloric acid solution reacts with the egg shells, an inorganic calcium source is generated, then a certain amount of egg white is added and evenly mixed, enzymolysis is conducted through protein hydrolytic enzyme, amino acid is generated, then zinc acetate is added, assisted by microwaves and electricity, calcium amino acid chelate crude products are generated, filtering, refining and drying are conducted, and the calcium amino acid chelate is obtained. It is proved that by means of the method, the complex percentage of amino acid is increased by 5-10%, product purity reaches over 98%, the operation process is simplified, industrialized mass production of the calcium amino acid chelate can be achieved, and the yield is raised.

The invention relates to the field of biotechnology, in particular to an extracting method of eaglewood essential oil. The extracting method comprises the following steps: performing sub-critical fluid extraction on crushed eaglewood and performing analytical separation on sub-critical fluid in which an extract is dissolved to obtain an eaglewood extract; performing microfiltration treatment on the eaglewood extract to obtain the eaglewood essential oil. The extracting method provided by the invention has the benefits that a sub-critical fluid extraction technology is applied to the extraction of the eaglewood essential oil; the eaglewood essential oil is separated under a mild condition in combination with a micro-filtration technology; the time consumed is short, no residual solvent exists, and the essential oil is purer.

The invention belongs to the traditional Chinese medicine field, and relates to an external plaster, and particularly relates to the plaster for treating scapulohumeral periarthritis and a preparation method. The plaster of the invention comprises the following raw materials by weight: 18-22 of ramulus mori, 12-18 of willow branches, 28-32 of Radix Astragali, 18-22 of Chinese angelica, 18-22 of taxillus, 18-22 of achyranthes root, 12-18 of Radix Codonopsis, 8-12 of radix sileris and 28-32 of spatholobus stem. According to the clinical tests, the plaster is capable of treating the following diseases: protrusion symptoms of lumbar intervertebral disks, hyperosteogeny, periomethritis, sciatica, lumbar muscle strain, rheumatoid arthritis, traumatic injury and the like. The plaster has the effects of warming and activating meridian, dispelling wind and cold, promoting blood circulation, and activating yang as well as removing paralysis, the invention has the advantages of low cost, good usage effect and short treatment course. The invention also provides a method for preparing the plaster, and the drug effect of the plaster reaches the optimum by using the preparation method.

The invention relates to the field of subcritical extraction and injection, specifically to a liposoluble component subcritical injection method which will not destroy activity of a product, is suitable for industrial large-scale production and helps realize alternation of components in a material. The method of the invention comprises the following steps: 1) pretreatment: drying, crushing and sieving; 2) extraction: placing the pretreated sample into an extraction tank, adding a subcritical fluid as an extraction solvent, extracting under a certain condition, carrying out constant-temperature desolvation after extraction, and desolventizing a liquid solvent to obtain a sample extract; 3) reversed extraction: placing the above extract and a material which needs to undergo subcritical injection into an injection tank, adding an injection solvent and carrying out subcritical injection under a certain condition, and carrying out constant-temperature desolvation treatment on the injection tank after the injection so as to obtain a material which has undergone injection treatment.

The invention discloses an anti-aging composition, and belongs to the technical field of cosmetics. The anti-aging composition comprises the following components: 3'-hydroxygenistein, a calanthe extract and a swertia chirata extract. Among the above components, the 3'-hydroxygenistein can effectively inhibit the generation of melanin in the skin; and the calanthe extract and the swertia chirata extract can promote intercellular signal exchange, so that effective proliferation and growth of fibroblasts and keratinocytes are achieved. Effective components contained in the calanthe extract and the swertia chirata extract also have the effect of anti-aging regeneration. Through the synergistic effect of the three components, the skin can be self-repaired, the compactness of the skin is improved, the gloss and elasticity of the skin are recovered, and wrinkles are reduced. The invention further provides a preparation method of the anti-aging composition. The preparation method is simple tooperate, and industrial production can be realized. The invention also provides application of the anti-aging composition to cosmetic preparation.

The invention belongs to the field of environmental functional materials, and provides a preparation method and application of a pyridylamino composite hydrogel adsorbent in order to solve the problemof efficient and rapid removal of heavy metal cations in strong acid wastewater. The preparation method comprises the following steps: dissolving an acid-binding agent, an aminopyridination modification reagent and polyethyleneimine in a water-organic mixed solution, and carrying out substitution reaction to obtain a modified solution; carrying out dialysis or ultrafiltration or nanofiltration onthe modified solution to obtain a refined PEIPD solution; and uniformly mixing the PEIPD solution with a polymer solution, and carrying out cross-linking and gelation reactions to obtain the pyridylamino composite hydrogel adsorbent. The hydrogel adsorbent disclosed by the invention is low in raw material cost, simple in preparation technology and suitable for large-scale production; and by adopting the hydrogel adsorbent disclosed by the invention, the strong-acid wastewater containing heavy metals can be directly treated without adjusting the pH value, and efficient and rapid removal of various heavy metal cations such as Pb(II), Cd(II), Ni(II), Cu(II), Zn(II) and Co(II) in the strong-acid wastewater is realized.

The invention belongs to the technical field of biologics, and in particular relates to a method for preparing aquatic livestock small molecule peptide without fishy smell or bitter taste. The method comprises the following steps: S1, performing enzyme deactivation on aquatic livestock enzymatic hydrolysate, and concentrating so as to obtain a treated liquid; S2, cooling the treated liquid, centrifuging so as to remove grease and impurities, and retaining the supernate; S3, performing alcohol precipitation on the supernate, leaving to stand, centrifuging so as to remove polysaccharide and macromolecule protein, and retaining the supernate; S4, performing ultra-filtration on the supernate, adding an antioxidant bacteriostatic agent into the retained liquid, and uniformly stirring; S5, recycling ethanol from the retained liquid, and drying, thereby obtaining the aquatic livestock small molecule peptide without fishy smell or bitter taste. The method is simple to operate and efficient in treatment, fishy smell and fishy bitter taste of aquatic livestock can be effectively removed, the fishy smell caused by oxidation of product grease can be effectively inhibited, trimethylamine caused by microorganisms or enzyme can be inhibited, and the expiration date of a product can be prolonged.

The invention relates to a method for high selectively extracting Artemisia vulgaris essential oil. The method comprises the following steps: (I) drying an Artemisia vulgaris raw material, and crushing into powder; (II) placing the Artemisia vulgaris powder in an extraction tank, vacuumizing to -100 kPa, pouring subcritical butane for extraction into the extraction tank as an extraction solvent, completing soaking a folium artemisia vulgaris sample by using the extraction solvent, adding an entrainer hydrophobic ion liquid [C4C10im]CF3SO3 for extraction, wherein the extraction heat is sourcedfrom a far-infrared generation apparatus arranged on the bottom of the extraction tank, and a glass viewing window is formed on the bottom of the extraction tank; and (III) pumping the liquid solventinto an evaporation tank, decompressing the liquid solvent at a constant temperature, and removing the solvent, thus obtaining the Artemisia vulgaris essential oil. The method has the advantages of simple process, low investment, high efficiency, and capability of producing the high-quality Artemisia vulgaris essential oil with high quality in an industrialization manner.

The invention discloses a method for preparing lithium titanate from an inorganic titanium source. The method comprises the following steps: preparing titanium oxysulfate by adopting a titanium concentrate sulfuric acid method; after freezing, carrying out membrane filtering to prepare a relatively pure titanium oxysulfate solution; preparing nano-grade titanium dioxide hydrate through a rapid crystal-seed-free hydrolysis method; after washing, adding aluminum powder to reduce residual iron through sulfuric acid; then carrying out the membrane filtering to obtain pure metatitanic acid slurry;adding a proper amount of lithium hydroxide into an acidic environment added with the sulfuric acid, and synthesizing; after calcining, obtaining the high-purity nano lithium titanate. The method disclosed by the invention has the beneficial effects that the nano lithium titanate can be prepared without the need of adding an expensive organic solvent and the cost is low; the calcining temperatureis low and a product is not easy to sinter and has stable quality; the product has low impurity content and can be used for a high-end lithium battery negative electrode material; the method can be used for industrialized large-scale production.

The present invention relates to a kind of high molecular solid / solid phase changing material with mixed net and comb structure, and features that polyglycol with two active end radical and polyglycol with one active end radical are fixed onto the high molecular skeleton material to form 3D mixed net and comb structure. The material of the present invention has relatively great phase change enthalpy up to 120 J / g, proper phase change temperature capable of being altered in 0-65 deg.c, stable solid state before and after phase change without supercooling, separating and other unstable phenomenon, high mechanical strength, high solvent resistance, good machining performance, no toxicity, no leakage, no corrosion, no pollution, long service life and other advantages. The present invention may be used widely in solar energy utilization, afterheat recovering, intelligent air conditioner and other fields.

The invention belongs to the technical field of composite material or high molecular foamed material, and especially relates to a preparation method of a maleic anhydride polypropylene micro-nano fiber / polyvinyl alcohol foamed material. The preparation method is capable of solving a problem in the prior art that the mechanical strength of conventional polyvinyl alcohol foamed material is low. According to the preparation method, PP-g-MAH micro-nano fiber and polyvinyl alcohol are taken as the main components, a foaming agent and a crosslinking agent are added to prepare the maleic anhydride polypropylene micro-nano fiber / polyvinyl alcohol foamed material. The mechanical performance of the foamed material is improved effectively through the cooperative effect of the components of the composite material.

The invention discloses a method for preparing (Z)-2-(tert-Methoxycarbonyl Methoxyimino)-2-(2-Aminothiazol-4-yl)Acetic Acid active ester, which includes that: in an organic solvent system and at -10 DEG C to 50 DEG C, 1.0mol of (Z)-2-(tert-Methoxycarbonyl Methoxyimino)-2-(2-Aminothiazol-4-yl)Acetic Acid (MICA Acid) and 1.0mol to 1.4mol of rubber accelerator DM (MBTS) are mixed; then 1.0mol to 1.3mol of organic amine and 0mol to 0.1mol of pyridinium derivative as a catalyst are added in; 1.1mol to 1.5 mol of phosphonic acid triethyl ester is dripped in within 1h to 8h at -10 DEG C to 50 DEG C;and the temperature is preserved for 1h to 6h, then the (Z)-2-(tert-Methoxycarbonyl Methoxyimino)-2-(2-Aminothiazol-4-yl)Acetic Acid active ester is obtained. The method adopts cheaper raw materials and a phase transfer catalysis technique; thus shortening reaction period, reducing production cost and having super high industrial application value.

The invention discloses aluminum powder for a double-sided PERC crystalline silicon solar cell, belongs to the field of materials, and the aluminum powder for the double-sided PERC crystalline siliconsolar cell has the oxygen content of 0.3-0.7%, the maximum particle size of 0.1-30 microns and the apparent density is 0.55-0.9 g / cm < 3 >. When the aluminum powder for the double-sided PERC crystalline silicon solar cell is used for the crystalline silicon solar cell, the consequences of slurry leakage, pollution and the like caused by damage to a printing screen can be avoided. Under the condition of high-temperature fast burning, aluminum powder particles are rapidly close to each other, barriers among the particles are eliminated, so that low aluminum paste line resistance and low batteryseries resistance are brought, and the photoelectric conversion efficiency of the battery is improved. The invention further provides aluminum paste prepared from the aluminum powder for the double-sided PERC crystalline silicon solar cell.

The invention provides a carrier of lyotropic liquid crystal injection. The carrier is prepared from the following raw materials in parts by weight: 40 to 90 parts of a lipid matrix, 10 to 30 parts ofan organic solvent and 10 to 40 parts of a hydration regulation agent, wherein the hydration regulation agent is at least one of octyl-glucoside, hexyl-beta-D-glucopyranoside, dodecyl-beta-D-maltoside sucrose stearate, cholesterol and polyglycerol ester. According to the carrier, the pore diameter of a cubic liquid crystal water channel is enlarged through pore expansion of the hydration regulation agent, and vascular endothelial growth factors are continuously slowly released for one week, the action time of protein medicines is prolonged and the action is remarkably enhanced.

The invention discloses a preparation method for an inverse organic solar battery. The inverse organic solar battery sequentially includes a substrate, a cathode modification layer, an organic photosensitive layer, an anode modification layer and an anode electrode from bottom to top, wherein the cathode modification layer is a thin film prepared by using the deposition of electrophoresis ZnO or TiO2 nanocrystal. According to the invention, an electrophoretic deposition method is introduced in the preparation of the inverse organic solar battery for the first time, compared with physical preparation processes, such as magnetron sputtering, pulsed laser deposition and the like, the method has a simple preparation process, and low preparation temperature, and greatly facilitates cost reduction of an the organic solar battery cost; compared with the chemical preparation processes, such as spin coating, sol-gel and the like, the method has the advantages that a film forming size is unrestricted and industrialized large-scale production can be realized; and besides, the method can also be applied to a flexible solar battery.

The invention relates to the field of subcritical extraction and injection, and particularly relates to a subcritical injection method of grape seed anthocyanidins, wherein the subcritical injection method is suitable for food, tobacco, medicine and food healthcare and other industries, has the advantages of simple process and low equipment investment, has relatively low pressure due to the fact that the whole process is performed under normal-temperature or low-temperature conditions, does not damage functional components of grape seed samples, anthocyanins and injected samples, and comprises the following steps: pretreating; sieving after drying and crushing; extracting; placing pretreated grape seeds into a subcritical extraction tank; injecting subcritical fluid as an extraction solvent; extracting under certain extraction conditions; desolventizing at a constant temperature and obtaining extracts containing the grape seed anthocyanidins after finishing extraction; placing the extracts and materials to be injected into a subcritical injection tank; adding an injection solvent; injecting under certain injection conditions; and desolventizing the injection tank at a constant temperature after finishing injection to obtain the materials after injection treatment.

The invention discloses a preparation method of a lithium battery diaphragm material and belongs to the field of synthesis of battery materials. The preparation method disclosed by the invention comprises the following steps: firstly mildewing on the surfaces of cotton linters by utilizing rich microorganisms in a liquid supernatant in a biogas tank to initially activate and defibrillate cotton fibers, and sterilizing and de-coloring by using hydrogen peroxide; then adding sodium dodecyl benzene sulfonate serving as a surface active agent into a sodium hydroxide solution to promote the defibrillation of the cotton linter fibers in the cooking process, removing impurities in raw materials to purify celluloses, and preliminarily hydrolyzing through the celluloses and pulping to keep close and uniform among the fibers; finally, polymerizing a layer of dopamine on the surfaces of the fibers to form a dense porous structure among the fibers and improve the mechanical strength of a diaphragm, reducing the looseness among the fibers through ultra-fine grinding and obtaining the lithium battery diaphragm material through sheet making and hot pressing. The lithium battery diaphragm material obtained by the preparation method disclosed by the invention is good in mechanical strength, a large amount of organic solvents are not needed in the preparation process, the obtained material is durable, the service life of the lithium battery diaphragm material is prolonged by 2 times or above compared with that of a conventional diaphragm, and the safety is greatly improved.

The invention discloses a preparation method of a zinc tryptophan complex. The method comprises the following steps: starting stirring, adding carbonate or bicarbonate into an organic solvent water solution, stirring to dissolve, adding tryptophan, pressurizing and stirring until no bubbles emerge, heating, adding a zinc source to react, and relieving pressure after the reaction is finished, and cooling, crystallizing, filtering, washing and drying the reaction system to obtain the zinc tryptophan. The preparation method disclosed by the invention is high in reaction rate, high in conversion rate, high in yield, simple and convenient in method, low in cost and capable of realizing industrial large-scale production, no new impurity is introduced, and no by-product is generated. The preparedzinc tryptophan can be used as a novel nutrition enhancer, and compared with other zinc products, the zinc tryptophannot only has the effect of supplementing tryptophan, but also has the effect of supplementing trace elements, and has a good application prospect.

The invention belongs to the technical field of coating production, and particularly relates to single-component water-based automobile chassis paint. The water-based automobile chassis paint provided by the invention is prepared from 30 to 50 parts of water-based epoxy ester dispersion resin, 5 to 15 parts of deionized water, 1 to 8 parts of butyl cellosolve, 0.5 to 5 parts of dispersing agent, 0.1 to 1 part of defoaming agent, 0.1 to 1 part of wetting agent, 0.1 to 1 part of flash rust inhibitor, 0.5 to 1.5 parts of adhesion promoter, 5 to 15 parts of modified zinc phosphate pigment, 1 to 5 parts of superfine calcium phosphate antirust pigment, 1 to 10 parts of superfine talcum powder, 5 to 18 parts of superfine barium sulfate and 0.1 to 1 part of fumed silica. 0.8-5 parts of carbon black and 0.1-1 part of iron oxide yellow. The water-based automobile chassis paint provided by the invention has high resistance, salt mist resistance of 420 hours or more, excellent adhesive force and chemical resistance to various metals, good flexibility and good impact resistance.

The invention discloses a method for extracting kavalactones by using subcritical water. The method comprises the steps of grinding the roots of Piper methysticum Forst and then adding into a supercritical extraction kettle, feeding deionized water, dynamically extracting for 30 to 60 min under the conditions that the temperature is 110 to 180 DEG C and the pressure is 0.3 to 2 MPa, adding an extracting solution into a macroporous resin for absorption, gradiently eluting with ethanol solution, concentrating an eluent under reduced pressure, extracting a concentrated solution with ethyl acetate for 2 to 3 times, collecting an ethyl acetate layer for concentration, and drying to obtain a product. With the adoption of the method for production, the method is friendly to environment, industrial operation is easily implemented, the extraction efficiency is high, and the production period is short.

The invention discloses a water-based metal priming paint for vehicles, and belongs to the technical field of paint coatings. According to the water-based metal priming paint for the vehicle, a water-based acrylic dispersion, a water-based acrylic polyurethane dispersion and a water-based polyurethane dispersion are compounded in proportion, so that the obtained product is more environment-friendly than traditional oil-based vehicle paint, and meanwhile, the defects that the water-based vehicle paint is low in resistance and paint is easy to fall off are overcome; when the product is used forspraying paint on vehicles, a paint film connection port is smooth in transition, silver powder is arranged well, and the interlayer adhesive force is excellent; the paint has the advantages of favorable water resistance, favorable high-temperature resistance, favorable weather resistance, favorable acid resistance, favorable alkali resistance, favorable gasoline resistance, favorable engine oil resistance, high hardness, and high toughness and favorable MEK wiping resistance, and is suitable for large vehicles such as coaches, refitted vehicles, rail transit vehicle bodies and the like. The invention also discloses a preparation method of the water-based metal base color paint for vehicles, and the preparation method is environment-friendly and economic, has simple operation steps, and can be used for industrial large-scale production.