357results about How to "The method is simple" patented technology

The invention relates to a handling method of organic wastewater. The method comprises using an active carbon material loaded with metal phthalocyanine to adsorb organic pollutant in the wastewater, immersing the active carbon material in water solution including oxidizer after saturation absorbing, or directly adding the active carbon material loaded with metal phthalocyanine and the oxidizer into the organic wastewater, catalyzing and degrading the organic pollutant, thereby the active carbon material is capable of regenerating and being used repeatedly. The handling method can be used for handling various organic wastewaters like phenol organic wastewater which is difficult to degrade, dye waste and the like or recycling intermediate water. The invention has the advantages of simple method, low costs, perfect treatment effect of the organic wastewater and the like.

The invention belongs to the field of mine safety, relating to a method for identifying rock mass failure instability early warning by utilizing stress displacement monitoring. The method is characterized by comprising the following steps of: determining a monitoring area in an excavated rock mass and numbering, monitoring stress and deformation changes of the rock mass by utilizing a borehole stressmeter and a multipoint position extensometer and monitoring in real time, converting a tangent modulus value of the rock mass, mastering a change trend of the tangent modulus value of the rock mass, and judging whether the rock mass failure instability early warning is carried out or not. The method disclosed by the invention is simple in construction, low in cost, good in effect, has better reliability and early warning accuracy, has the capabilities of shortening the time of the rock failure instability early warning, improving the safety environment of construction and avoiding the losses of labors and devices, and is suitable for the fields of mines, tunnels, side slopes, hydropower station chambers and the like formed by excavating the rock mass.

The invention discloses a preparation method and the application of a catalytic material for transition metal carbides, belonging to the preparation technical field of the catalytic material. The invention is characterized in that in the method, carbon material, oxide or molecular sieve, and the like, are used as vectors and transition metal compounds are used as precursors. The vectors and the transition metal precursors are mixed by dipping or mechanical method and a microwave-assisted chemical sedimentation method is adopted to prepare the catalyst for loaded transition metal carbides. The weight percentage of loading of the transition metal compounds is 1-200 percent. Particles of the catalyst for the loaded transition metal carbides are highly uniformly distributed on the surface of the vectors. And the catalyst can be applied to a plurality of reactions of electrocatalysis oxidation of methanol, hydrazine decomposition, acetonitrile hydrogenation, etc. The preparation method and the application have the beneficial effects of simple preparation process and easy operation. And the obtained catalytic material shows high activity in the electrode reaction and a plurality of catalytic reactions of fuel cells.

A preparation process for decell corium substrate material is disclosed. It is characterized in its process: selecting healthy animals, conducting physical and chemical treatment to raw hide within 3 hours after killing and peeling, coat shedding, purifying by compound enzyme skin collagen treatment agent, alkaline and other chemical substance. The obtained decell corium substrate material has favorable biocompatibility and appropriate biodegradation velocity. The material can be used for corium substitute, ulcer and skin habilitation, plastic surgery, beautifying and other medical purpose.

The invention discloses a nucleic acid screening method of staphylococcus aureus, salmonella, shigella and listeria monocytogenes, belonging to the field of biological assay. In the method, by virtue of a loop-mediated isothermal amplification (LAMP) technology and a specific primer, the specific area of target genes is amplified by an LAMP technical platform; and with the aid of a positive and negative quality control system and an internal control detection system, nucleic acid screening or detection is carried out on the staphylococcus aureus, the salmonella, the shigella and the listeria monocytogenes from the molecular level. The nucleic acid screening method of the invention has the characteristics of being simple, convenient, economical, fast, sensitive and specific, and the method has wide application prospect.

The invention discloses a pulse vortexing defect quantitative detection method and a detection system. The detection method mainly comprises the followings steps of: step 1, obtaining a relation curve algebraic expression of a time domain signal difference peak value among response signals and surface defect depth or width or a relation curve algebraic expression of a frequency domain signal fundamental frequency difference peak value among the response signals and the surface defect depth or width under the condition with known defect depth or width of a tested piece; and step 2, carrying out quantitative evaluation on the defect depth or width of the tested piece, thus obtaining a time domain signal curve or a frequency domain signal curve of a test signal, and further obtaining a time domain signal difference peak value or a frequency domain signal fundamental frequency difference peak value between the test signal and a reference signal, and then substituting the time domain signal difference peak value or the frequency domain signal fundamental frequency difference peak value to the curve algebraic expression obtained in the step 1, thus finally obtaining the defect depth or width. The detection method and the detection system provided by the invention can detect the existence of a defect by solving the relation between signals through differential operation, and also can quantitatively obtain the defect depth or width, are simple, and are easy to operate.

The invention relates to a preparation method of a maleic anhydride modified polybenzimidazole crosslinking membrane, which takes amino dibasic acid and aromatic tetraamine as monomer raw material and polyphosphoric acid as reaction medium and reaction is carried out for 5-30 hours at 150-220 DEG C under the nitrogen protection condition so as to obtain homopolymer containing amino polybenzimidazole, and takes the amino dibasic acid, nonaminonic dibasic acid and the aromatic tetraamine as the monomer raw materials so as to prepare copolymer of amino polyphosphoric under the same conditions. The prepared homopolymer and the copolymer of the polybenzimidazole have good dissolvability in solvents of dimethyl sulphoxide, N, N- dimethylacetamide, phosphate, vitriol and methane-sulforic acid, etc. and after the prepared homopolymer and the copolymer of the polybenzimidazole are dissolved in an organic solvent, reaction is carried out with the maleic anhydride to obtain maleic anhydride modified polybenzimidazole which goes through thermal crosslinking when casting into membrane, thereby obtaining the polybenzimidazole crosslinking membrane that has good mechanical property.

The invention provides a method for preparing a manganese dioxide one-dimensional nanometer material in the field of inorganic nanometer material. The method comprises the following steps: solvent a and solvent b are prepared, wherein the solvent a is prepared by dissolving manganese chloride in pure water, adding a dressing agent into the water to be mixed, and the ratio of molar weight of the manganese chloride and the dressing agent is 3:2-1:2; the solvent b is prepared by dissolving potassium permanganate in the pure water; the solvent a and the solvent b in the step one are mixed, wherein the mixing is carried out according to the molar ratio of the manganese chloride and the potassium permanganate of 3:2; the mixed solvent is stirred, and the mixed solution is transferred into a high pressure autoclave containing a polyfluortetraethylene liner to react for 2 to 24 hours at a temperature of between 100 and 200 DEG C, then naturally cooled; a product obtained after cooling in the step two is washed and dried to obtain the manganese dioxide one-dimensional nanometer material. The method has the advantages of simple and convenient operation, high yield, even and controllable product crystal formation and appearance and the like.

The invention relates to a touch device detection method. The touch device comprises a capacitive screen and a capacitive screen control chip, wherein a plurality of drive lines and sense lines which are placed in a crossed way are arranged on the capacitive screen; when a touch device is detected, all drive lines are driven in sequence, and the mutual capacitance value between each drive line and each sense line is measured; and whether the touch device has a defect is detected by judging whether the mutual capacitance value is in a threshold interval. According to the touch device detection method provided by the invention, whether the touch device has abnormity is detected by detecting the capacitance instead of conventional mechanical detection steps; the method is simple and convenient; whether the touch device has the abnormity can be judged rapidly and accurately; and therefore, defective products are prevented from flowing into the next process, and the cost is saved.

The invention belongs to the field of disinfectants, and concretely relates to a Chinese herbal medicinal disinfectant for the breeding industry. The disinfectant is based on a Chinese herbal medicinal extract liquid, the Chinese herbal medicinal extract liquid comprises, by mass, 25-35% of a garlic extract liquid, 15-25% of a Herba Houttuyniae extract liquid, 15-20% of a purslane extract, 9-15% of an Artemisia argyi, gingko and Artemisia carvifoliaextract liquid, and 10-20% of a pine branch and leaf extract liquid, and the mass percentage content sum of all the above extract liquids is 100%. The disinfectant can control fungal and bacterial diseases, can improve the disease resistance of bred animals (poultry fish and the like), prevents the propagation of diseases, ensures the normal life order of the bred animals without transition, can be directly used to disinfect breeding places (ponds, farmlands and birdhouses) and transport machines and apparatuses, and can kill pathogens on objects in contact with the animals in the animal breeding environment, and the effective rate of the disinfectant is above 85%.

The invention belongs to forming range of three-dimensional structure, and particularly relates to a direct-writing forming method of printing and converting a precursor into ceramic. The method includes: using a ceramic precursor as a solute, dissolving the ceramic precursor in liquid-state organic matter, stirring raw materials to obtain ink with certain viscoelasticity, and putting the ink intoa needle cylinder; through an air pressure controller and according to a set program, printing out a three-dimensional structure on a substrate layer by layer, and carrying out precursor conversion to obtain ceramic with a complex three-dimensional structure. The direct-writing forming method overcomes the defect that existing direct-writing forming ceramic suspensions are prone to nozzle blockage, low in continuity and unstable in slurry in the process of forming. The designed slurry is simple and reasonable in composition, high in rheological controllability and convenient for large-scale industrial application. A three-dimensional periodic structure prepared by the method is wide in scale range, and decimeter-scale, centimeter-scale, millimeter-scale, micrometer-scale or nanometer-scale control can be realized simply through adjusting aperture of a needle head.

The invention discloses a positioning method and system. The method comprises the steps of obtaining laser radar data, camera data and inertia measurement data, fusing the laser radar data, the cameradata and the inertia measurement data and obtaining a data fusion result, and determiningposition and posture information according to the data fusion result. Compared with the prior art, the methodis simple in process, high in positioning precision and low in hardware requirement and has a very high practical value and a popularization value.

The invention relates to a preformed eccentric post for checking the a-fetoprotein alloplasm of liver cancer, wherein said eccentric post is formed by upper separating tube and lower collecting tube; the separating tube contains affinity medium of coupled small lentils agglutinin (LCA); the bottom of separating tube is one filter cloth; the lower collecting tube contains buffer solution; said LCA can combine the a-fetoprotein alloplasm sugar chain. The invention also provides a relative chemical lighting testing agent box of said preformed eccentric post and an enzyme couple immunity quantitative testing agent box with preformed eccentric post, and relative preparation and application. Said agent box can quickly and simply test the content of a-fetoprotein alloplasm, to diagnose liver cancer.

The invention discloses a distributed encryption method for a real-time video. Real-time video stream data are received by using a real-time calculation frame; the real-time video stream data are segmented into video fragment data by using time as reference and each time fragment corresponds to one piece of video fragment data; according to the video fragment data, an elastic distributed data set is constructed, wherein each element in the elastic distributed data set expresses one piece of video fragment data; all elements in the elastic distributed data set are distributed to all node work stations; and the node work stations carry out encryption processing on the video fragment data and output encryption results. According to the method, distributed encryption on the real-time video can be realized rapidly. Compared with the prior art, the method has advantages of simple process, low operation realization difficulty, and good encryption effect.

The invention belongs to the field of mobile terminals, and discloses a mobile terminal and an application switching method. In the embodiment, firstly, applications installed in the mobile terminal are loaded in the background according to a preset period, and preset memory resources are correspondingly allocated to the applications; then, an application switching instruction sent by a user is received, preset split screen modes are displayed on a display screen of the mobile terminal according to the application switching instruction, and corresponding preset application classes are displayed in the preset split screen modes; finally, the class selected by the user in the preset application classes and the application selected by the user in the class are received, and the selected application is run. The application switching method of the mobile terminal is simple and convenient to implement, prevents the user from performing misoperation and improves use experience of the user.

The present invention relates to preparation process and application of metal-carbon nanometer composite material. The present invention prepares metal-carbon nanometer composite material by using furfural or its derivative as carbon source and metal salt as the furfural polymerizing catalyst, and through a hydrothermal or solvent thermal process and a carbonizing process. Thus prepared metal-carbon nanometer composite material has controllable appearance, hollow structure and great specific surface area as well as homogeneous distribution of metal on the carbon carrier. The preparation process has the advantages of facile material, simple operation, short period, low cost, etc. and is suitable for industrial production. The obtained metal-carbon nanometer composite material is used as the precursor for high activity catalyst, adsorbent, high grade ink, etc.

The invention relates to a method for simultaneously measuring the residue of multiple pesticides in cotton by a liquid chromatography tandem mass spectrometry/mass spectrometry method. The method comprises the steps of (1) carrying out sample treatment; (2) measuring by adopting the liquid chromatography tandem mass spectrometry/mass spectrometry method; (3) carrying out a blank test; and (4) carrying out result calculation and expression, namely calculating the contents of all the pesticides in a sample according to a formula: X=CV/m, wherein X represents the contents of all the pesticides in the sample in milligrams per kilogram, C represents the concentrations of all the pesticides in sample liquid obtained by a standard work curve in micrograms per milliliter, V represents the final volume of the sample liquid in milliliters, and m represents the sample amount of the final sample liquid in grams. The measurement method can be used for simultaneously measuring the residue of the multiple pesticides in the cotton by adopting the liquid chromatography tandem mass spectrometry/mass spectrometry method and is simple, convenient, fast, accurate and reliable; the detection limit, the recovery rate and the accuracy of the method are in accordance with the requirements.

The invention discloses an optical fiber grating measurement method for monitoring an embankment section settlement. The method comprises the following steps of: fixing steel-plastic strips or other alloy strips at two ends of a measured embankment section and adopting concrete fixed pedestals with ground anchors at the two ends; laying strain sensing optical fibers and temperature compensation sensing optical fibers on the surfaces of the steel-plastic strips or other alloy strips and fixedly gluing the sensing optical fibers on the steel-plastic strips or other alloy strips; wrapping the steel-plastic strips or other alloy strips glued with the sensing optical fibers with geotextiles; and mounting the steel-plastic strips or other alloy strips glued with the sensing optical fibers and wrapped and protected by the geotextiles on the monitored embankment section, and setting the two ends fixed on the monitored embankment section on the fixing pedestals. The method is simple, easy to implement, low in cost and suitable for measuring the settlement of the embankment section with any width and under any topographic conditions, can realize automatic measurement and has relatively high precision and accuracy shown by test results.

The invention relates to a winding device for a shimming superconducting coil, which comprises an upper cover plate (1), a lower cover plate (2), a central column (3), a spring (4), a pressure needle (5), a fixing clamp (6), a superconducting wire (8), a screw (9) and a ring (10). The upper cover plate (1) and the lower cover plate (2) are connected through the central column (3), and a clearancewith the size identical to the diameter of the wire is left between rectangular teeth of the upper cover plate (1) and the lower cover plate (2). The superconducting wire (8) pressed by the top end of the pressure needle (5) with the spring mechanism (4) slides along the circumference on a horizontal plane to be wound the superconducting coil.

The invention discloses a cell fast charge control method based on the theory of 'direct current charging measurement', including changing the charging current, to obtain the internal resistance size of cell through detecting the changing condition at the two end of the secondary battery or the battery; then realtime outputting the controlling quantity of the charging current according to the range of the internal resistance of the cell and the measured adjusting strategy; meanwhile determining end of the fast charge process according to that whether the surface temperature exceeds the set value or the battery charging voltage is present with minus delta U, to reach the object of safe, fast and high efficiency charging. The invention has simple realization and marked effect; the inventive charger can effectively prolong the service life of the secondary cell and advance the availability of the secondary cell.

The invention discloses an oxygen-functionalized carbon material and uses of the same, and belongs to the technical field of adsorbent. The invention is characterized in that the oxygen-functionalized carbon material is prepared by oxidative modification of hydrogen peroxide or ultrasonic-assisted hydrogen peroxide; the number of oxygen-containing functional groups on the surface of the carbon material after the oxidative modification of the hydrogen peroxide is obviously increased, but the pore structure and the strength of the carbon material are basically kept unchanged; the adsorption capacity of the oxygen-functionalized carbon material on metallic ions such as Ag, Cu and Cr is greatly improved compared with a raw material carbon; and when an impregnated carbon catalyst prepared by infusing the oxygen-functionalized carbon material is used for protecting cyan chloride, the protection time of the impregnated carbon catalyst is improved by 20 to 30 percent under the same preparation condition compared with the raw material carbon. The oxygen-functionalized carbon material prepared by the oxidative modification of the hydrogen peroxide or the ultrasonic-assisted hydrogen peroxide has the advantages of simple process, quickness, environmental protection, and the like, and provides an effective carbon carrier for the impregnated carbon catalyst for protecting the cyan chloride.

The invention relates to a graphene band prepared with an acid oxidized flat carbon nano-tube and a method for preparing the graphene band. The method includes the specific and main steps: preliminarily oxidizing a carbon nano-tube with acid; oxidizing the carbon nano-tube with strong oxidizers; adding water for hydrolysis; adding hydrogen peroxide for purification; and preparing the graphene band after washing and drying. The acid oxidized flat carbon nano-tube is precisely, directionally and longitudinally cut along the edge of the acid oxidized flat carbon nano-tube, so that the regular and uniform high-quality graphene band is prepared. The method is simple and convenient, is easy to implement and control, and can be used for directional cutting in a wide temperature range and under various oxidization conditions, and preparing the graphene band on a large scale. The prepared graphene band is uniform, regular and narrow, has uniform layers and neat edges, and can be applied to composite materials, conductive and heat conducting materials, sensors, electronic circuits, micro-nano devices and related fields.

The invention belongs to the technical field of environment-friendly functional materials and particularly relates to a method for preparing a composite cellulose porous imprinting adsorbent. The method comprises the following steps: firstly extracting nano-crystalline celluloses (NCCs) from medicinal degreasing cotton by virtue of an acid hydrolysis method, adding 4-nitrophenol (4-NP) serving as a template molecule, acrylamide (AM) serving as a functional monomer, N,N'-methylene-bisacrylamide (MBAM) serving as a crosslinker, Tween 85 serving as a surfactant and potassium persulfate serving as an initiator into an NCCs colloidal suspension serving as a water phase and liquid paraffin serving as an oil phase, preparing oil-in-water (o/w) Pickering high internal phase emulsions (HIPEs) and carrying out thermally initiated polymerization to prepare the composite cellulose porous imprinting adsorbent, wherein the adsorbent is used for selectively identifying and adsorbing 4-NP in the solution. The adsorption test results show that the imprinting adsorbent prepared by the invention has good adsorption capacity, relatively rapid dynamic performance and selective identification performance on 4-NP.

The invention provides a detection kit for mycoplasma pneumonia (PM). The detection kit comprises a nucleic acid releasing agent and PCR (polymerase chain reaction) reaction liquid, wherein the nucleic acid releasing agent comprises 0.01-0.5mM/L of surfactin, 20-300mM/L of potassium chloride, 0.01-2% of sodium dodecyl sulfate and 0.05-1% of ethanol, and the PCR reaction liquid comprises a forward primer and a reverse primer which are used for amplifying targeted polynucleotide as well as a probe for detecting the targeted polynucleotide. The detection results of extracting nucleic acid by utilizing a nucleic acid releasing method and a boiling method have no obvious difference, and a strong albuminous denaturant is utilized for destroying a coat protein structure of a pathogen rapidly so as to release the nucleic acid of the pathogen and release and extract the DNA (deoxyribonucleic acid) without heating. The sensitivity of the kit for detecting MP can reach 400copies/ml, and the quantitative linearity range is 400-4.00E+09copies/ml. The kit can be used for rapid and accurate detection of MP-DNA in unknown samples such as sputum, throat swab and the like, thus providing reliable experimental basis for mycoplasma pneumonia infection.

The invention relates to a method for preparing an epoxy morpholine quaternary ammonium salt-modified polybenzimidazole anion exchange membrane, which comprises the steps of: at first, adding chloroepoxy propane and N-methylmorpholine to an acetonitrile solvent, controlling reaction time and temperature to obtain epoxy morpholine quaternary ammonium salt, then dissolving an amino-containing polybenzimidazole homopolymer or copolymer in an organic solvent, reacting the organic solvent with the epoxy morpholine quaternary ammonium salt to obtain epoxy morpholine quaternary ammonium salt-modified polybenzimidazole, then dissolving the epoxy morpholine quaternary ammonium salt-modified polybenzimidazole in the organic solvent, adding a diepoxy crosslinking agent to the organic solvent, and performing casting membrane forming to obtain the epoxy morpholine quaternary ammonium salt-modified polybenzimidazole anion exchange membrane with excellent properties, wherein the anion electric conductivity of the membrane can reach 0.06S/cm. The epoxy quaternary ammonium salt compound-modified polybenzimidazole crosslinking membrane has quite extensive industrial application prospect in the fields such as alkali fuel cell, water treatment, heavy metal ion recovery and the like.

The invention discloses a rhodococcus strain C3. A preparation method of the rhodococcus strain C3 comprises the following steps of sucking an activated sludge sample from a wastewater biological treatment system of a coking plant to a fresh enrichment culture medium of phenol for shaking culture, wherein the inoculum concentration is 1%; after an enrichment bottle becomes muddy, taking a certain amount of the culture solution, inoculating a phenol liquid culture medium with increased concentration with the culture solution for culturing; in the same way, gradually increasing the concentration of phenol to 1000mg/L; inoculating an inorganic salt culture medium with the concentration of phenol being 1000mg/L with the strain enriched by the enrichment culture medium for domestication; and separating and screening a strain taking phenol as the unique carbon source and energy source from an isolation medium plate by adopting a dilution spread plate method and a streak plate A single colony of the strain is separated from an LB solid medium in a streaking manner, wherein the single colony is yellowish and semitransparent, has a neat edge and wet texture, and is easy to prick up; phenol, pyridine and o-cresol are taken as carbon sources, and the strain can degrade 1000mg/L of phenol in the inorganic salt liquid culture medium. The invention further provides a microbial agent taking rhodococcus strain C3 as the active component, and a preparation method of the microbial agent.

The present invention discloses a Shenqi hypoglycemic preparation HPLC standard finger print and a construction method thereof. The construction method comprises the following steps: preparing test sample solutions and a reference solution, measuring the test sample solutions and the reference solution by using the HPLC method and the linear gradient elution process, so as to obtain the Shenqi hypoglycemic preparation finger prints, wherein the chromatographic condition is that a mobile phase A is acetonitrile, a mobile phase B is 0.1% (v/v) phosphoric acid solution, the detection wavelength is 203nm, the column temperature is 25-35 DEG C and the flow rate is 0.8-1.2mL/min. The common characteristic peaks of at least ten finger prints are used as the characteristic peaks of the standard finger print; the standard finger print comprises 38 characteristic peaks, and the numbers of the characteristic peaks of saponin of ginseng stem and leaf, astragalus, Chinese magnoliaving, rehmannia root and raspberry are 13, 4, 7, 3 and 4 respectively. The Shenqi hypoglycemic preparation HPLC standard finger print and the construction method thereof can comprehensively and accurately evaluate the whole quality of the Shenqi hypoglycemic preparation, and facilitate to ensure the quality and the clinical curative effect of the Shenqi hypoglycemic preparation.

The invention discloses a preparation method of a catalyst for methanol electrocatalytic reforming. The method comprises the following steps: first, dissolving a certain amount of terephthalic acid (BDC) in a mixed solution with a certain proportion of ethanol, deionized water and N,N-dimethylformamide (DMF), then dissolving CuCl2.2H2O and CoCl2.6H2O in the mixed solution, adding triethylamine (TEA), carrying out stirring for a plurality of minutes, carrying out ultrasonic treatment under a sealing condition for a plurality of hours for generating a double-metal organic framework compound of copper ions, cobalt ions and the BDC, carrying out ultrasonic centrifugation for a plurality of times, carrying out drying at room temperature to obtain a sample (marked as CoCu-BDC), mixing the samplewith carbon black according to a certain proportion, adding a certain amount of Nafion solution, and carrying out ultrasonic dispersion in a mixed solution of ethanol and water, so as to obtaining catalyst slurry finally. The CoCu-BDC prepared by the method provided by the invention is dispersed in the slurry in the form of ultra-thin nanometer sheets in the catalyst, the charge conduction capability is good, and the very high methanol electrocatalytic reforming performance is achieved. In addition, the preparation method is simple and feasible, has a short preparation time, and has a good industrial application prospect.

The invention relates to a standard emission sample for detecting the comprehensive performance of an environmental chamber and a detecting method thereof. The invention belongs to the indoor environment detection field; and the sample comprises a unidiameter long tube just with one open end and volatile organic compound liquid which is put into the long tube. The method comprises the following steps that: a model of the emission velocity of the volatile organic compound liquid VOC in the standard emission sample and the influence of the emission velocity on the concentration of the environmental chamber is established; parameters needed for the model are acquired; the standard emission sample is positioned in the environmental chamber to be measured; under a closed state of the environmental chamber, the VOC liquid in the tube is freely diffused; the VOC concentration in the environmental chamber is calculated and obtained by the model; the VOC concentration in an outlet of the environmental chamber is acquired by a gas chromatograph in real time; and the acquired value is compared with the VOC concentration calculated by the model so as to evaluate the comprehensive performance of the environmental chamber. The standard emission sample and the detection method are simple and easy to operate and have high precision and reliability.

The invention relates to an improved preparation method of a polypropylene hollow fiber separation membrane. The invention belongs to the field of high-molecular material science. The method comprises the steps that: (1) polypropylene and a diluent are added into a kettle with a stirring device; heating and stirring are carried out, such that a membrane casting liquid is obtained; and when stirring is stopped, the liquid is subjected to standing and defoaming for 0.5-2h; (2) the membrane casting liquid is filtered by using a filter; an inner core liquid is introduced into a spinning nozzle, wherein a nozzle temperature is 145-165 DEG C; the inner core liquid and the membrane casting liquid are extruded by the spinning nozzle; the mixture first passes through air atmosphere, and then enters a multi-stage coagulating bath; the membrane casting liquid is cooled by the multi-stage coagulating bath, and the hollow fiber membrane is obtained by curing; (3) the hollow fiber membrane is wound by using a winding machine, and is extracted in one or a plurality of extraction agents; and (4) the extracted membrane is fetched and dried; and extraction agent is removed, such that the polypropylene hollow fiber separation membrane is obtained. With the method provided by the invention, under a same condition, a membrane flux is improved from 15/m<2>.h of one-stage water coagulating bath to higher than 1200/m<2>.h of two-stage coagulating bath.