75results about How to "Suitable for actual production" patented technology

The invention refers to a kind of compound lyosol fixing arrangement agent, a synthesizing method and the usage. The arrangement agent is made up of following products: (1) the silicon sol is made up of gamma-glycidol ether oxygen propyl trimethoxy-silane, water and hydrochloric acid, whose mol proportion is: 1:5-100:1í‡10 -5-1í‡10 -1; (2) the titanium sol is made up of titanic acid butyl ester, water and hydrochloric acid whose proportion is 1:0.1-10:10-200: 1í‡10 -4-1í‡10 -1; (3) the product is produced by mixing above mentioned silicon sol and titanium sol, the mol proportion of silicon and titanium is 1:0.05-1.0. The arrangement agent may form a mesh particle film on the surface of the fiber, realizes the color fixing aim.

The invention discloses a method for refreshing Chinese dates. The method comprises the following steps of: 1) spraying an antistaling agent A on the Chinese dates twice or three times 20 to 40 days before picking; 2) picking the Chinese dates with stems, spraying water in an amount which is 1 to 10 mass percent of the collected Chinese dates within 3 to 5 hours after picking, and pre-cooling the Chinese dates at the temperature of between -1 and 2 DEG C under the 300 to 600 Pa vacuum condition for 10 to 30 min; and 3) soaking the pre-cooled Chinese dates in an antistaling agent B for 1 to 10 min, taking out and draining, sealing and preserving in freshness protection packages with gas regulator, and refreshing and storing at the temperature of between -1 and 2 DEG C. In the method for refreshing the Chinese dates, comprehensive refreshing technology, which comprises the steps of spraying the antistaling agent before picking, classifying and collecting the picked Chinese dates, performing vacuum pre-cooling in real time in fields, soaking in the antistaling agent after pre-cooling, adding the gas regulator and storing in a refrigeration house at low temperature is adopted; in the whole refreshing link, a relatively mild environment is adopted, so that the nutrition components, appearance and flavor of the Chinese dates are well preserved; moreover, the method has simple steps, the antistaling agent is easy to prepare and the storage conditions are easy to implement and the method is suitable for practical production.

The invention provides a self-assembled super-molecular polymer nano-filtration membrane based on graphene and a preparation method thereof. The specific method comprises: taking a polyacrylonitrile super-filtration membrane or a sulfonated polyethersulfone super-filtration membrane which are subjected to alkali modification treatment as a base membrane and fixing the base membrane into a container with a porous supporting layer; putting a membrane surface upward; adding a covalent cationic polyelectrolyte solution and a super-molecular polymer solution into the container respectively; pressurizing and assembling; sufficiently washing with de-ionized water and repeating for a plurality of times; putting the membrane into a drying oven for carrying out heat treatment to obtain a multilayered super-molecular polymer nano-filtration membrane; finally, immersing the multilayered super-molecular polymer nano-filtration membrane into a graphene oxide solution; pressurizing and assembling; sufficiently washing with de-ionized water; putting the multilayered super-molecular polymer nano-filtration membrane into the drying oven for carrying out heat treatment to obtain the self-assembled super-molecular polymer nano-filtration membrane based on the graphene. The nano-filtration membrane prepared by the preparation method provided by the invention contains a super-molecular polymer so that the controllability of the nano-filtration membrane is improved and the separation effect is good; the preparation method is simple and efficient and does not utilize an organic solvent, so that the protection method is green and environment-friendly.

The invention provides an abrasion resisting cast iron coating and a preparation method thereof, belonging to the technical field of steel surface coating protection. The technique comprises: treating the steel surface; melting the abrasion resisting cast iron raw material under the protection of inactive gas in a furnace with the melting temperature of 1080-1200 DEG C; dipping the 45 steel after surface treatment into the abrasion resisting cast iron solution, wherein the hot dip coating lasts 5-30s and the abrasion resisting cast iron comprises the following composition by weight percentage: 5% of Ni, 2% of Cr, 3.1-3.3% of C, 0.8% of Si, 1.5% of B, 0.9% of Mn and the rest being Fe; cooling naturally in static air after the hot dip coating to form an abrasion resisting cast iron layer with the thickness of 0.5-10mm on the work-piece surface. The invention has the advantages of short period of coating preparation, high production efficiency, low requirement for equipment, no pollution in production process, simple technique, low cost and simple and easy operation, and is suitable for actual production.

The invention provides an extraction method of cordyceps sinensis intracellular polysaccharide. The extraction method comprises the steps of: performing water extraction and alcohol precipitation of fungal powder to obtain crude polysaccharide; degreasing, deproteinizing and dialyzing the crude polysaccharide; and performing column chromatography purification to obtain fine polysaccharide. The fine polysaccharide is high in extraction rate, good in purity and excellent in antioxidant effect, and the antioxidant effect of the fine polysaccharide is far better than that of the cordyceps sinensis polysaccharide extracted by the prior art.

The invention relates to a vehicle starting and braking system. A clutch and a belt pulley are arranged on a spindle between a traditional engine and a gearbox, the belt pulley is connected with a belt pulley of an air compressor via a belt, and another clutch is disposed between the belt pulley of the air compressor and a crankshaft. An air outlet of the air compressor is connected with an air filter, and an outlet of the air filter is connected with a steel cylinder. A pressure gauge and two outlets are disposed on the steel cylinder. One outlet is connected with a pneumatic motor, and a power shaft of the pneumatic motor is connected with the belt pulley of the air compressor via a belt. Compared with the prior art, the vehicle starting and braking system has the advantages that vehicle starting output power can be increased, a vehicle can smoothly start under the condition of high resistance, the vehicle starting and braking system is energy-saving, emission-reduction and environment-friendly, can assist an operator of the vehicle to easily inflate tires, and is low in cost and high in system safety.

The invention discloses a supramolecular polymer nanofiltration membrane and a preparation method thereof. According to the nanofiltration membrane, an ultrafiltration membrane serves as a base membrane, a supramolecular polymer and covalent positive ion polyelectrolyte serve as assembling substances, and the nanofiltration membrane is prepared in a dynamic and static mixing layer-layer self assembling mode, wherein the ultrafiltration membrane is loaded with negative electricity, and the molecular cut off is smaller than 70, 000; the supramolecular polymer is a coordination type supramolecular polymer. By adjusting the kinds of transition metal ions, the matching of metal ions to a ligand, concentration of the metal ions and the ligand, the concentration of the supramolecular polymer, the kinds of the covalent positive ion polyelectrolyte, the number of assembling layers, the kinds of base membranes and the like, the structure of the nanofiltration membrane can be conveniently adjusted, nanofiltration membranes meeting different requirements are prepared, an adopted solvent in the whole assembling process is water, and the preparation process is environmentally friendly.

The invention relates to a preparation method of carbon steel or stainless steel composite, which belongs to the technical field of metal composites. The components of the stainless steel (wt percent) are as follows: less than or equal to 0.15 percent of C, 17 percent to 19 percent of Cr, 8 percent to 10 percent of Ni, less than or equal to 1 percent of Si, less than or equal to 2 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.030 percent of S and the balance of ferrite. The processes comprises surface treatment of 45 steel, melting of the stainless steel under the protection of the inert gas in a medium frequency induction furnace and the melting temperature is between 1400 DEG C and 1500 DEG C, immersion into the stainless steel molten of the 45 steel for 1 to 10 seconds after the surface treatment and natural cooling in the standing air. A stainless steel layer of the thickness between 0.5 to 3mm can be formed on the surface of the 45 steel. The method has the advantages of short production time, high efficiency, simple equipment with little effect on the service life, continuous production, and simple and easy operation, being suitable for practical production, simple process and low cost.

The invention discloses a preparation method for flower-shaped micron-sized silver powder with slender and large petals. The preparation method includes the following steps that silver nitrate water solution is prepared, ascorbic acid aqueous solution is quickly added to the silver nitrate solution at a certain stirring rate, reaction is conducted at 20-30 DEG C for 5-10 minutes, silver powder iswashed with a large number of deionized water immediately, and the flower-like micron-sized silver powder with the slender and large petals is obtained after drying. The method does not need to add substances such as surfactants, the preparation process is simple and easy to operate, and the obtained silver powder is uniform in appearance, high in purity, and high in conversion rate, and suitablefor actual production.

The invention discloses a production device and a production method for distribution type plant oil transesterification. The production device comprises an equipment frame, a reaction kettle, a washing tank, a catalyst recovering tank, a drier, a warm water storage tank, a heat conducting oil heating tank, a reaction circulating pump, an air pump, a material pump and a heat conducting oil pump. The production method comprises the following steps of: heating and stirring a mixture of plant fat raw material oil, low-carbon alcohol and a pyridyl trifluoromethanesulfonate ion liquid catalyst to react for 3-5 hours; standing so that reaction materials are divided into a light phase and a heavy phase, and separating the light phase from the heavy phase; standing the heavy-phase material and naturally cooling, so that the catalyst is precipitated to the bottom, and the rest is crude glycerol containing alcohol; adding warm water to the light-phase material for washing, and then standing so that the light phase and the heavy phase are formed again; and pumping the light-phase material into the drier for drying, so as to obtain the plant oil. The production method disclosed by the invention can achieve homogeneous catalysis and different-phase separation through process integration, and the yield of the plant oil is improved; and the production device disclosed by the invention is handy and simple, and is convenient for real-time processing of a dispersed raw material.

The invention relates to a freeze-dried powder injection of posaconazole and a preparation method thereof. The powder injection comprises active treatment ingredients consisting of posaconazole, cyclodextrin, a metal ion chelating agent and a pH conditioning agent. The preparation method comprises the following steps: dissolving cyclodextrin and disodium edetate under stirring; adjusting the pH value of a solution obtained in the previous step to 1 to 2; adding posaconazole and dissolving posaconazole under stirring so as to obtain a clear solution; adjusting the pH value of the clear solution to 2.0 to 3.5; allowing the volume of the solution to reach a fixed value through addition of water; and successively carrying out aseptic filtering, separation and freeze drying. According to the invention, through effective control of the proportions of posaconazole, the metal ion chelating agent and the like in a recipe, insoluble particles before and after combination of medicinal liquid is reduced, and the prepared freeze-dried powder injection of posaconazole has the advantages of good stability of active ingredients and convenience in transport and storage.

The forced sintering method of powder 316L stainless steel is characterized by that in the product a proper quantity of sintering activating agent Cu3P or Fe-Mo-B whose component composition is reasonable is added, and a reasonable sintering process is made. The activating agent is Cu3P 2-8 wt% or Fe-Mo-B 2-8 wt%, P content is Cu3P is 13-14%, Mo content in Fe-Mo-B is 30-55%, and B content is 2-5%, sintering activating agent can be premixed into 316L stainless steel powder, they are ground by using ball-grinding machine, and its sintering temp. is 1200-1350 deg.C. Said invention also provides the concrete steps of heating to sintering temp. and cooling to room temp.

The invention provides a preparation method of a composite nano-filtration membrane with self-repairing, bacterium-resisting and solvent-resisting functions. The specific method comprises: mixing a transition metal ion solution and a bichelidoxalic acid solution; adjusting the pH (Potential of Hydrogen) value of a mixed system through utilizing a buffering solution; sufficiently stirring to obtain a super-molecular polymer solution; fixing a base membrane in a container with a porous supporting layer and putting a membrane surface upward; adding a cationic polyelectrolyte solution; pressurizing, assembling and washing with water; then adding into the super-molecular polymer solution, and pressurizing, assembling and washing with the water; carrying out heat treatment to obtain a double-layered modified membrane; repeating for 1 to 3 times to obtain a multilayered super-molecular polymer nano-filtration membrane; finally, immersing the multilayered super-molecular polymer nano-filtration membrane into a polylysine solution; pressurizing, assembling and washing with the water; carrying out the heat treatment to obtain the composite nano-filtration membrane with the self-repairing, bacterium-resisting and solvent-resisting functions. The preparation method provided by the invention is simple and efficient; the prepared nano-filtration membrane is high in flux and good in separation effect and also has self-repairing, bacterium-resisting, solvent-resisting and fluorescence performance.

A green production novel method which adopts the violent redox reaction between the metal nitrate and the acetate as well as the organic fuel to prepare the nano magnesium gallate is provided. The magnesium acetate, the gallium nitrate, the ammonium nitrate and the organic fuel are evenly grinded into the precursor paste and are moved to the reactor and are lit; the precursor paste continuously burns to gain nano magnesium gallate powder. The method has lower operation temperature than that of the traditional method, fast reaction rate, controllable stoichiometry, small crystal grain size and high product quality, which avoids the product sintering caused by high temperature calcinations and the environment protection, thereby is a green production novel method which can meet the demand of the high-tech industries and has high practicability.

The invention discloses a temperature compensation method for engine valve size measurement, which relates to the field of workpiece measurement and aims at solving the problem that a large error exists in calibration of the actual length of the valve due to the influences of workshop temperature in the prior art. The valve size L0 at a standard temperature T0 is firstly calibrated as an actual calibration size; the actual temperature T1 of the workshop is measured; the actual size L1 at the actual temperature T1 is measured; L0=L1+(T0-T1)*alpha is obtained by a formula, wherein alpha is a thermal expansion coefficient of a valve making material; and the L0 is finally displayed on a size measurement instrument. As long as the special standard temperature is calibrated, the actual calibration size at the standard temperature can be calculated based on the formula, and the method is applicable to workshops in any temperature environment.

The invention provides a recombinant plasmid containing a human SMIM25 gene, a genetic engineering bacterium, a recombinant protein, a polyclonal antibody, a preparation method and application thereof, and relates to the technical field of biological engineering. The recombinant plasmid contains a human SMIM25 gene fragment; and the recombinant plasmid is low in production cost, and can be inducedin escherichia coli to generate recombinant fusion protein, and used as an antigen to prepare the SMIM25 polyclonal antibody so as to rapidly and accurately detect SMIM25 protein, thereby carrying out auxiliary diagnosis of gastric cancer. The SMIM25 recombinant fusion protein can be used as an antigen for related immunological experiments; and the SMIM25 recombinant fusion protein is used as animmunogen to be mixed with an adjuvant and then injected into a rabbit, and the polyclonal antibody is obtained after protein purification, and the obtained polyclonal antibody can be combined with prokaryotic expression protein and the SMIM25 protein in human cells so as to be used for further researching the specific functions of the SMIM25 gene.

A carburization method using high carbon cast iron solution as carburizer belongs to the technical field of steel surface chemical heat treatment. The invention is characterized in that: low carbon steel and alloy carburizing steel are taken as materials to be carburized, high carbon cast iron is taken as carburizer raw material, wherein, the high carbon cast iron comprises the following components by weight percentage: 5% of Ni, 2% of Cr, 3.1-3.3% of C, 0.8% of Si, 1.5% of B, 0.9% of Mn, the rest being Fe; the melting temperature of high carbon cast iron ranges from 1080 DEG C to 1200 DEG C; the work piece, which is subject to surface treatment and needs to be carburized, is immersed into the high carbon cast iron solution for carburization in the ways of normal temperature and pre-heating, and the carburization lasts 10-60s; after carburization, the work piece is naturally cooled in the static air, and then a carburization layer with the thickness of 20-1000mum can be formed on the surface of the sample. The invention has the advantages of short carburization period, high production efficiency, no internal oxidation of elements in the steel, no deposited carbon on the steel surface, little influence on the service life of the equipment, simple technique, low cost and convenient and simple operation, and is suitable for actual production.

The invention discloses a construction method of a liquid crystal confinement space assembly microarray and a liquid crystal composite material prepared by the same, which are characterized in that liquid crystal forms an ordered assembly in confinement space, and the ordered assembly is arranged into the microarray in a two-dimensional plane. According to the invention, an elastomer with a micro-cavity array structure is utilized to form an assembled micro-cavity, liquid crystal materials are filled between liquid crystal self-organizing structures, a consistent or gradient liquid crystal assembly array is formed under the confinement condition, the microstructure of the formed liquid crystal assembly is regulated and controlled through the structure and property of the cavity, the stripespacing of liquid crystals is regulated by adding high polymer materials, and the liquid crystal self-organizing structures are fixed through ultraviolet light polymerization. According to the method, the liquid crystal assembly can be prepared and regulated on the micron scale, the limitation of a macroscopic method on precise construction of a liquid crystal structure is broken through, all units of the obtained assembly array are regular and consistent, and the method is suitable for production and application. The microcosmic optical structure of the liquid crystal assembly array has important values in application of nonlinear optical devices and intelligent sensors.

The invention provides a method for preparation of alpha-hydroxy ketone from an ethynylation reaction byproduct. The ethynylation reaction byproduct is adopted as the raw material, and loaded metal ruthenium is adopted as the catalyst for Meyer-Schueter rearrangement reaction on alkynediol substance in the raw material, thus obtaining alpha-hydroxy ketone. The product has high selectivity, the ethynylation reaction byproduct is comprehensively utilized, the product value is improved, and the method adapts to the industrial production requirements.

The invention relates to a sheep immunopotentiation functional additive, and a preparation method and an application thereof. 1 kg of the functional additive includes 30-100 g of lycium barbarum polysaccharide, 30-80 g of astragalus polysaccharide, 100-400 kIU of vitamin A, 10-38 kIU of vitamin D, 1200-3500 IU of vitamin E, 2.0-4.0 g of zinc methionine, and 1.0-2.0 g of selenium methionine. The preparation method includes the steps of: ultramicro-pulverizing and stirring the lycium barbarum polysaccharide, the astragalus polysaccharide, the zinc methionine and the selenium methionine to obtain a first mixture; adding the vitamin A, the vitamin D and the vitamin E to the first mixture with stirring to obtain a powder of the sheep immunopotentiation functional additive. The additive is applied by being added to a feed or drinking water for sheep. The additive can improve growth of sheep and enhance immunity of the sheep.

The invention discloses a simvastatin composition. The composition is formed by uniformly mixing simvastatin, as well as a diluent and a flow agent, which are pharmaceutically acceptable. Simvastatin is mixed with the pharmaceutical diluent in an equivalent incremental manner, and then, the mixture is mixed with the pharmaceutically-acceptable flow agent to obtain simvastatin capsule. According to the invention, on the condition of not adding an antioxygen or an acidifier, the qualified simvastatin capsule is prepared through simple mixing and filling, so that the simvastatin capsule is more stable, controllable and applicable to large-scale production.

The invention discloses a preservation method of tomatoes. The method comprises the following steps: selecting picked fresh tomatoes of which the red skin accounts for over 100% of superficial area; classifying, namely classifying the tomatoes according to the size; cleaning, namely mechanically cleaning for 2 minutes after using normal temperature water at 10 DEG C, and airing by using an air dryer; vacuum packaging, namely pumping pressure and vacuum packaging under eight barometric pressures; high-temperature sterilization, namely putting the vacuum packaged tomatoes into a sterilization pot, adding water, and raising the temperature to 100 DEG C from normal temperature within 20 minutes; and cooling to normal temperature after preserving heat for 20 minutes, and taking out to obtain the product. No preservative, corrosion remover or pigment is utilized, fresh mouthfeel and quality of red dates can be kept, and the tomatoes can be stored for 24 hours at normal temperature. The preservation method disclosed by the invention is simple in steps, and applicable to practical production, out-of-season selling of the fresh dates in the market can be achieved, the supply time of the fresh tomatoes is balanced, the supply in low and peak seasons is adjusted, the industrial structure of deep processing of the fresh tomatoes is adjusted, the out-of-season price difference of the tomatoes is improved, and economic income of agricultural products is increased.

The invention discloses a method for preparing a coumarin film taking polymethyl methacrylate as a matrix. The method comprises the steps: (1) respectively preparing a 7-hydroxy-4-methylcoumarin solution and a polymethyl methacrylate solution; (2) preparing a 7-hydroxy-4-methylcoumarin / polymethyl methacrylate mixed solution; (3) directly dripping or spin-coating the mixed solution obtained in the step (2) on a clean and dry glass sheet or quartz sheet with a measuring tool, and drying at the temperature of 25-80 DEG C in an atmospheric or vacuum environment, so as to obtain a 7-hydroxy-4-methylcoumarin / polymethyl methacrylate film with the concentration of 1.0*10<-5>mol / g to 1.0*10<-4>mol / g. The method is uniform in film forming and little in change to luminescence wavelength and is more beneficial to the research on luminescent properties of materials; the method is simple, is mild in conditions and easy in operation and control, and is applicable to actual production.

The invention discloses a method for preparing a blue-light coumarin film taking polymethyl methacrylate as a matrix. The method comprises the steps: (1) respectively preparing a 7-diethylamino-4-methylcoumarin solution and a polymethyl methacrylate solution; (2) preparing a 7-diethylamino-4-methylcoumarin / polymethyl methacrylate mixed solution; (3) directly dripping or spin-coating the mixed solution obtained in the step (2) on a clean and dry glass sheet or quartz sheet with a measuring tool, and drying at the temperature of 25-80 DEG C in an atmospheric or vacuum environment, so as to obtain a 7-diethylamino-4-methylcoumarin / polymethyl methacrylate film with the concentration of 1.0*10<-5>mol / g to 1.0*10<-4>mol / g. The method is uniform in film forming and little in change to luminescence wavelength and is more beneficial to the research on luminescent properties of materials; the method is simple, is mild in conditions and easy in operation and control, and is applicable to actual production.

The invention discloses a preparation method of self-supporting porous dendritic graphite foam. The preparation method comprises the following steps: growing Ni-Cu alloy dendritic branches on foamed nickel through an electrochemical deposition method, and growing graphite on a metal semi-finished product in hydrogen and ethylene through chemical vapor deposition to obtain graphite metal foam; and finally, soaking the graphite metal foam, and removing the metal framework through chemical etching to obtain the self-supported porous dendritic foam only containing graphite. The self-supporting porous dendritic graphite foam can be used as a dielectrophoresis electrode to remove bacteria in water, and is short in bacteria removal time, high in efficiency, low in energy consumption, long in service life, low in cost, safe, non-toxic and suitable for actual production.

The invention provides anti-bioerosion wear-resistant recycled aggregate pervious concrete and a preparation method thereof, and the pervious concrete comprises the following components in parts by weight: 1350 parts of recycled aggregate, 285-360 parts of cement, 25-45 parts of superfine slag powder, 25-45 parts of copper tailing slag, 90-125 parts of water, 0.16-0.22 part of a water reducing agent, 12-25 parts of redispersible latex powder, 0.15-0.25 part of cellulose ether, 0.5-4 parts of magnesium fluosilicate, 1-5 parts of sodium silicate and 0.5-3 parts of copper sulfate. Compared with common pervious concrete, the concrete has more excellent wear resistance by adding the copper tailing slag and utilizing the wear resistance of the slag, and in a humid environment, growth of moss in an outdoor semi-shady humid environment can be effectively inhibited by virtue of a copper ion slow release effect of copper sulfate in cement slurry with strong alkalinity and a compact structure; and the concrete has a certain sterilizing effect, can reduce underground water pollution, is good in working performance, low in cost and environment-friendly, saves resources, and has a good application prospect.

The forced sintering method of powder 316L stainless steel is characterized by that in the product a proper quantity of sintering activating agent Cu3P or Fe-Mo-B whose component composition is reasonable is added, and a reasonable sintering process is made. The activating agent is Cu3P 2-8 wt% or Fe-Mo-B 2-8 wt%, P content is Cu3P is 13-14%, Mo content in Fe-Mo-B is 30-55%, and B content is 2-5%, sintering activating agent can be premixed into 316L stainless steel powder, they are ground by using ball-grinding machine, and its sintering temp. is 1200-1350 deg.C. Said invention also provides the concrete steps of heating to sintering temp. and cooling to room temp.

The invention discloses a method of piping continuous production for fatty acid monoethanolamide; a piping reaction production apparatus used herein comprises a reaction coil, an outlet of the reaction coil is connected with an inlet of a high-pressure tank, and an outlet of the high-pressure tank is provided with a valve; the method comprises the steps of 1) filling the reaction coil with methanol; 2) boosting pressure in the reaction coil to 1.5+ / -0.1 MPa via inert gas, and adjusting inner temperature of the reaction coil to 140-200 DEG C; 3) using mixed methanol solution of fatty acid methyl ester and ethanolamine, introducing the methanol solution into the reaction coil at certain flow rate to carry out reaction; allowing the reaction fluid into the high-pressure tank, and when the inner pressure of the high-pressure tank is higher than 3 MPa, opening the valve to discharge the reaction fluid in the high-pressure tank; 4) removing unreacted materials and methanol from the reaction fluid discharged from the high-pressure tank so as to obtain fatty acid monoethanolamide.

The invention discloses a preparation method of a blue-ray coumarin film with polyvinyl alcohol as a substrate. The preparation method comprises the following steps: 1) preparing a 7-diethylamino-4-methyl coumarin solution and a polyvinyl alcohol solution respectively; 2) preparing a mixed solution of 7-diethylamino-4-methyl coumarin / polyvinyl alcohol; 3) directly dripping or spinning the mixed solution obtained in step 2) on a clean and dry glass or quartz plate by using a measuring implement, and in an atmospheric or vacuum environment, drying at 25-80 DEG C to obtain a 7-diethylamino-4-methyl coumarin / polyvinyl alcohol film with the concentration of 1.0*10<-5>mol / g to 1.0*10<-4>mol / g. By the preparation method, the film is uniform, change in an emission wavelength is small and study on luminescent properties of materials can be easier; the preparation method is simple, mild in condition and easy to operate and control and is applicable to actual production.