78results about How to "Avoid conditions" patented technology

The invention relates to high-silicon-to-aluminum-ratio hierarchical beta zeolite and a preparing method of the beta zeolite. The bore diameters of channels of the beta zeolite are distributed in ranges smaller than 2nm, between 5 and 11nm, and greater than 50nm, wherein the micropore volume is greater than 0.19cm<3> / g, the total volume of meso pores and macro pores is greater than 0.35cm<3> / g, the silicon-to-aluminum ratio is greater than 90, and the specific surface area is greater than 400m<2> / g. The preparing method comprises the following steps that raw material beta zeolite is subjected to primary acid treatment; the beta zeolite subjected to the primary acid treatment is subjected to primary calcination; the beta zeolite after the primary calcination is subjected to secondary acid processing, and the high-silicon-to-aluminum-ratio hierarchical beta zeolite is obtained. The preparing method provided by the invention has the advantages that the operation is simple and efficient, and the prepared high-silicon-to-aluminum-ratio hierarchical beta zeolite has high acid, thermal and hydrothermal stability and good diffusion performance.

A multi-operating mode frame type portable landslide testing device for a geomechanical model belongs to the field of geological hazard model test. The testing device comprises a frame-beam-type testing bed, a rainfall simulator, a water level regulator and a self-weight horizontal loading mechanism, wherein the frame-beam-type testing bed mainly comprises a cuboid framework, a front panel, a rear panel and a base plate; the rainfall simulator is arranged at the top of the frame-beam-type testing bed and comprises a plurality of spraying pipes and nozzles on the spraying pipes and is used for simulating rainfall in the frame-beam-type testing bed; the water level regulator comprises a left-side trough and a right-side trough respectively formed on the left and the right sides of the frame-beam-type testing bed, and a plurality of drainage holes are respectively formed on the right panel of the left-side trough and the left panel of the right-side trough and used for changing the water levels of water level simulation libraries in the left-side trough and the right-side trough; and the self-weight horizontal loading mechanism is arranged above the right-side trough and used for bearing weights, so as to exert horizontal load to the landslide model in the frame-beam-type testing bed.

The invention relates to a k nearest neighbor search method for a variable weight network. The method comprises the steps as follows: routing thinking in a computer network is led in k nearest neighbor query, and predecessor / subsequent information in shortest path tree obtained in computation is taken as history data and is saved in a routing table by designing an update strategy of the routing table. Due to the dynamical update strategy of the routing table, the routing mechanism can adapt to dynamic changes of local road weights in a road net. The k nearest neighbor search method provides the candidate set screening rule and the road net area cutting rule of a non-mobile object as well as the position prediction method and the candidate set screening rule of a mobile object in the dynamical road net, effectively reduces the number of candidate points and narrows down the search range of the k nearest neighbor query, and avoids the defect that indexing and constraint conditions are adjusted frequently because the changes of a k nearest neighbors algorithm are caused by the road weights continuously in the conventional dynamical road net extended from a static road net.

The invention discloses an electrochemical polishing electrolyte and polishing method for titanium and a titanium alloy. The electrolyte comprises, by mass percentage, 10%-90% of corrodent, 1%-5% of an additive, 1%-5% of a polynitrogen compound and the balance water. The electrochemical polishing method comprises the following steps of pretreatment, surface oil removal and acid pickling treatment, electrolyte compounding, electrochemical polishing treatment and aftertreatment. The electrochemical polishing electrolyte is simple in formula, stable in performance, long in service life, low in price and capable of being used cyclically for multiple times; reaction conditions such as the low temperature or the relatively high voltage or the large current are not needed; and the electrochemical polishing electrolyte is more suitable for large-scale industrialized production. The surface reflectivity of a finished workpiece obtained through the electrochemical polishing method ranges from 70% to 95%, and surface roughness Ra is smaller than 0.05 micron.

The invention discloses a making method of 4-hydroxy-6-oxy-7-ethoxy-3-quinoline carboxylic acid carbethoxy in the coccidiostat domain, which comprises the following steps: A. preparing catechol diethyl ether; B. making .3, 4-diethyloxy nitrobenzene; C. making 2-ethoxy-4-nitrophenol; D. making 3-ethoxy-4-oxynitrobenzene; E. making 3-ethoxy-4-oxyphenylamine; F. preparing N-methylene ethyl malonate-3-ethoxy-4-oxyphenylamine; G obtaining the product.

The present invention discloses a bleaching method of feather fabric. It includes the following steps: firstly, using ferrous ions to pretreat the feather fabric, then making selective oxidation in hydroperoxide solution, finally making reduction bleaching in sodium hydrosulfite. Said method not only can remove natural colour mater containing in feather fabric, but also can raise whiteness of fabric.

The invention discloses a socket capable of preventing electricity stealing and relates to the technical field of sockets. The socket capable of preventing electricity stealing comprises an upper cover and a socket body. The upper cover and the socket body are connected through a connecting part. The upper cover and the socket body are provided with mechanisms which are matched with each other and used for being assembled to be a lock for locking the upper cover and the socket body respectively. After the upper cover and the socket body are locked, the function of sealing the jacks of the socket is achieved. The socket capable of preventing electricity stealing is convenient to mount and use, can achieve the purpose of preventing electricity stealing effectively, can prevent water from entering the socket, and is suitable for being used outdoors; the upper cover is provided with notches, and therefore electricity taking and electricity stealing prevention can be achieved at the same time. According to the socket capable of preventing electricity stealing, the high cost for mounting a charging pile and the complex mounting conditions of the charging pile can be avoided, and the waiting time for using a public charging pile is eliminated, or the trouble for vehicle picking up can also be avoided.

The invention discloses a method for detecting Leersia hexandra middlechro (VI) ion concentration by using a CdTe@SiO2 quantum dot-rhodamine B energy converting system. The system regards CdTe@SiO2 quantum dot as a donor, regards the rhodamine B as an acceptor, utilizes chromium (VI) ions and the rhodamine B to form novel composite in a combining mode through static interaction, causes the fluorescence of the rhodamine B extinction, thereby establishing the method for detecting Leersia hexandra middlechro (VI) ions. The extinction degree of the rhodamine B fluorescence and the concentration of the chromium (VI) ions are in a good linear relation in the range of 2.0*10-8-3.0*10-7 mole / liter, the linear relevant coefficient r=0.9992, and method detection limit is 6.2*10-9 mole / liter. The method for swiftly detecting the Leersia hexandra middlechro (VI) ion concentration overcomes the defects of being poor in selectivity, low in sensitivity, rigorous in reaction condition and bad in stability and the like while detecting in the prior art, effectively improves selectivity and sensitivity, and so that the detection for the Leersia hexandra middlechro (VI) ions are more convenient and swift.

The invention discloses an action guidance method based on action capture. The method comprises the steps of acquiring a standard action image and a user action image; outputting digital signals of key points and two-dimensional coordinates of a human body in the standard action image and the user action image; identifying the limb length and the limb included angle of the human body, and markingdigital signals of each joint point of the human body and the two-dimensional coordinates of each joint point in the standard action image and the adjusted user action image; respectively enabling thedigital signals of the two-dimensional coordinates of each key point of the human body in the standard action image to correspond to the first human body skeleton model, and enabling the digital signals of the two-dimensional coordinates of each key point of the human body in the adjusted user action image to correspond to the second human body skeleton model; comparing the included angles between limbs in the actions of the first skeleton model and the second skeleton model to judge whether the actions of the user and the standard actions are within an error range or not; and if the deviation between the action of the user and the standard action exceeds a threshold value, reminding the user to adjust the action towards the direction of reducing errors.

The invention discloses a laser radar based robot mapping navigation system. The system includes: a mobile robot; a remote workstation, which is connected to a robot control system through a wirelesslocal area network and is used for remote transmission of a robot's movement, scanning, mapping and navigation instructions; a robot control system, which is used for controlling the robot's movement,scanning, mapping and navigation according to the instructions of the remote workstation; a laser radar sensor, which is used for 360-degree rotation to scan the surrounding environment; and a powersupply system, which is used for power supply to the whole system. The invention also discloses a laser radar based robot mapping navigation method. The system and method provided by the invention adopts the laser radar sensor, have high stability and strong real-time performance, and are added with the remote workstation to realize human-computer interaction, fully meet the requirements of robotmapping navigation, solve the shortcomings of the prior art, have stable and reliable implementation way and good universality, and can be widely applied in robot mapping and positioning navigation field.

The invention discloses an acidic etching instrument and an operation method thereof. The acidic etching instrument comprises a visualized core holder made of transparent materials, wherein the visualized core holder is of a hollow sealed structure, the upper end of the visualized core holder is provided with an upper through hole, the lower end of the visualized core holder is provided with a lower through hole, and the upper through hole and the lower through hole are both communicated with the inside of the visualized core holder. The acidic etching instrument and the operation method thereof disclosed by the invention have the beneficial effects that the instrument adopts a one-inch columnar core, therefore, an effect of easy processing is achieved, and actual reservoir cores can be adopted for carrying out experimental researches; the etching form of cores can be subjected to real-time tracking; and the whole acidic rock reaction process is reflected really, and a study on the change of annular fracture diverting capacity can be performed, thereby achieving the purpose of optimizing an acidizing fluid system and an acidizing process.

The invention relates to a method for converting higher fatty acid into long-chain alkane by using a photocatalysis decarboxylation method. The method comprises the step: in the presence of a nitrogenatmosphere and a solvent, performing a photocatalysis reaction so as to convert the higher fatty acid into long-chain alkane, wherein the catalyst is TiO2 and / or metal surface modified TiO2. By adopting the method provided by the invention, under the condition that no external hydrogen sources are needed, long-chain alkane is synthetized with low energy consumption and high efficiency, and the yield can be up to 46%. The higher fatty acid can be sufficiently adopted as a raw material, and the raw material is reacted at the room temperature in the presence of light energy, so that the situation that a great deal of fossil fuel is consumed in a conventional industrial preparation method is avoided, high-temperature and high-pressure reaction conditions are not needed, complex catalysts arealso not needed, the operation is simple, no external hydrogen sources are needed, and the conversion rate is relatively high; and a reaction solvent and a product can be separated through simple rotational evaporation or are directly used as fuel, so that industrial production is facilitated. The product, namely long-chain alkane, can be used as aviation fuel to replace fossil fuel.

The invention discloses a heteroatom doped polymer nano-microsphere and a preparation method thereof. The method includes: under a stirring condition, adopting a mild reaction temperature (10-50DEG C), using aromatic amine and aldehyde as the raw materials, in the presence of a compound shown as general formula I in the specification, letting aldehyde and the compound shown as general formula I generate Schiff base in an aqueous solution system, and subjecting aromatic amine and the generated Schiff base to addition, thus obtaining the heteroatom doped polymer nano-microsphere. The technological method adopted by the invention has the characteristics of simple operation, mild conditions and fast reaction. The nano-microsphere product prepared by the method has the advantages of controllable size and morphology, uniform particle size, large yield, and uniform heteroatom doping, thus having good application prospects.

The invention provides a composite diaphragm for a lithium metal secondary battery and a preparation method and application of the composite diaphragm, the composite diaphragm comprises a diaphragm base layer and a functional coating coated on at least one surface of the diaphragm base layer, and the functional coating comprises active substance particles capable of reacting with lithium metal. The coating is transferred to the surface of a metal lithium negative electrode in the battery assembling process, an in-situ conversion reaction occurs in the subsequent battery circulation electrochemical process, a mixed electron ion conductor layer is generated, meanwhile, ion and electron distribution on an interface is adjusted, the ion concentration gradient is relieved, uniform lithium deposition is guided, and generation of lithium dendrites is inhibited. The lithium metal secondary battery applying the composite diaphragm shows excellent cycle performance and rate capability. The composite diaphragm provided by the invention avoids the tedious process and harsh operation environment of direct modification of lithium metal in the prior art, the preparation technology is simple, theraw materials are easy to obtain, and the composite diaphragm has extremely high practical and large-scale prospects.

The invention discloses a preparation method of methyl-3-pentenoate. According to the invention, gamma-valerolactone and methanol which are adopted as initial raw materials undergo ester change and a dehydration reaction under the action of a catalyst to obtain methyl-3-pentenoate, and simultaneously the obtained methyl-3-pentenoate is separated through distillation. The method provided by the invention has the advantages of high reaction selectivity, simple technology, simple operation, and environmental protection, and the highest yield and the highest selectivity of the methyl-3-pentenoate reach 95% and 98% respectively.

The invention relates to a method for manufacturing a solar battery, comprising the following steps: (101), manufacturing and forming a PN junction; (102), depositing an anti-reflection film; (103), judging whether a technological chamber is needed to be cleaned or not, if so, performing the step (104), and otherwise, performing the step (105); (104), cleaning the technological chamber; and (105), manufacturing electrodes. In addition, the invention also relates to equipment for manufacturing the solar battery, comprising the technological chamber, an air intake device, an evacuating device, a PN junction forming module, a deposition module, a control module, a chamber cleaning module and an electrode manufacturing module. By adopting the method and the equipment for manufacturing the solar battery, the technological vacuum chamber is cleaned when judged to need cleaning without machine halt. Therefore, the method and the equipment for manufacturing the solar battery can effectively reduce and even eliminate the condition that attachments on the inner wall of the chamber fall off to cause pollution for a silicon wafer and can improve the production efficiency of the equipment.

The invention provides a synthesis method for a 3-thioether isoindolinone compound. The synthesis method comprises the following steps: catalyzing a 3-hydroxyl -2-phenmethyl-isoindoline-1-one compoundand a thiol compound by using Ni (II) to generate imine cation in situ, and performing a nucleophilic addition reaction, so as to obtain 3-thioether isoindolinone, wherein the product yield is 82-95%. The method is completed at one step, is simple in operation, simple in raw material and reagent, high in reaction yield, capable of avoiding defects that a conventional method is high in catalyst price and harsh in condition and easy in product separation and purification, has great values for research on synthesis of 3-thioether isoindolinone compounds, and has great significances for synthesisof sulfur-containing natural products and medicine molecules.

The invention provides a preparation method of a mycete and agricultural and forestry waste mixed bio-adsorbent, and relates to a preparation method of an adsorbent. The preparation method aims at solving the problems that in the prior art, the cost of the adsorbent for processing heavy metal is high, and the secondary pollution can be easily caused. The preparation method comprises the following steps that agricultural and forestry wastes are dried, and then are smashed and sieved; then, the sieved agricultural and forestry wastes and water are mixed according to a mass ratio being 1:1; next, mycotic spores are inoculated; then, the fermentation cultivation is carried out; the mycete and agricultural and forestry waste mixed bio-adsorbent is obtained, and the preparation is completed. The preparation method has the advantages that green and environment-friendly effects are achieved, the industrial production is easy, and meanwhile, the adsorbing quantity is great. The preparation method is applied to the field of the adsorbent.

The invention relates to a quantum dot-nanosheet -interconnected assembled composite material and a preparation method thereof. The composite material comprises quantum dots and nanosheets, wherein first organic functional ligands are attached to the surfaces of the quantum dots; second organic functional ligands are attached to the surfaces of the nanosheets; and the quantum dots are attached tothe upper surfaces and the lower surfaces of the nanosheets through the polymerization effect of the two organic functional ligands; so a quantum dot-nanosheet-interconnected assembled composite structure is formed. According to the invention, tight combination of the quantum dots and the high-thermal-conductivity nanosheets is realized, and the problem that the quantum dots are hard to be combined with the high-thermal-conductivity nanosheets is effectively solved; and the composite material improves the thermal conductivity of the quantum dots, effectively overcomes the problem of heat accumulation of the quantum dots in an excitation state, and enhances the thermal stability of the quantum dots .

The invention discloses a preparation method of yttrium oxide stabilized zirconium oxide powder based on supercritical dispersion roasting. The method comprises the following steps: first, weighing zirconium salt and yttrium salt, mixing the zirconium salt with the yttrium salt to prepare a precursor material of the yttrium oxide stabilized zirconium oxide powder, and drying the precursor material; mixing the dried precursor material with a grinding auxiliary agent and a dispersing agent, grinding the mixture into the d10 being less than 100 nm and d50 being greater than 150 nm in a nano-sandmill; continuously conveying the ground slurry into a high-pressure kettle with the temperature being greater than 250 DEG C and the pressure being greater than 6.5 MPa through a metering pump, and spraying the slurry into a calcining furnace for combustion from an outlet, wherein the precursor is dispersed by the grinding auxiliary agent and the dispersing agent which are in a supercritical stateand is decomposed into the yttrium oxide stabilized zirconium oxide powder in the calcining furnace. The yttrium oxide stabilized zirconium oxide powder prepared with the method has small particle size, uniform particle size and nearly spherical morphology, and can meet the requirement of high-end application.

The invention aims at the field of chemical industry and relates to a method for preparing alpha-aminoisobutyric acid. The method comprises the step of enabling acetone cyanohydrin and ammonium carbonate to be subjected to pressurized and heated reaction in an aqueous medium, thereby synthesizing alpha-aminoisobutyric acid, wherein ammonium carbonate can be replaced with ammonium bicarbonate or ammonia and carbon dioxide. The invention further relates to preparation using an alpha-aminoisobutyric acid production device, wherein a gas stripping device is especially used for recovering carbon dioxide and ammonia gas which are generated during synthesis reaction and are recycled for the synthesis of alpha-aminoisobutyric acid. According to the method disclosed by the invention, the yield is high, the purity of a product is high, and the equipment investment is small; in a whole process, carbon dioxide and ammonia are hardly consumed, no byproduct inorganic salt is produced, and inorganic base is not consumed, so that a very positive effect on the full and comprehensive utilization of resources and environmental protection is exerted; recovered carbon dioxide and ammonia and crystallized mother liquor are sufficiently utilized, so that the problem of pollution to environment caused by waste gases, waste water and waste residues can be excellently solved, and the environmental-friendly and clean production is really achieved.

The disclosure relates to a method of making organic light emitting diode array. A base defining a plurality of convexities is provided. A number of first electrodes are applied on the plurality of convexities. A patterned second insulative layer is made among the convexities to cover first parts of the first electrodes between the convexities and expose second parts of the first electrodes on top surfaces of the convexities to form a number of protrudent portions. A number of electroluminescent layers are transfer printed on the number of protrudent portions to form a number of organic light emitting layers. A second electrode is electrically connected to the number of organic light emitting layers.

The invention provides a defrosting control method for an air conditioner. The defrosting control method for the air conditioner comprises the steps that after the air conditioner operates in a defrosting mode, the actual defrosting time of the air conditioner in the current cycle is acquired; a proportionality coefficient K is calculated according to the difference between the actual defrosting time and a standard defrosting time, and the defrosting control time of the air conditioner operating in the defrosting mode in the current cycle is acquired; and the defrosting control time of the airconditioner operating in the defrosting mode in the next cycle is calculated according to the proportionality coefficient and the defrosting control time of the current cycle. According to the defrosting method for the air conditioner, the proportionality coefficient is calculated according to the difference between the actual defrosting time in the current cycle and the standard defrosting time,and a proper time variable is obtained through the proportionality coefficient to correct the defrosting control time of the air conditioner operating in the next cycle, so that the operability of the method is high, the universality is good, the defrosting operation time is made reasonable finally, the actual defrosting time of each cycle is made to close to the standard defrosting time (namelythe frosting thickness is consistent), and the comfort of users is improved.

The invention discloses a method for preparing L-menthol intermediate d-citronellal. The method comprises the following steps of: (1) enabling geranyl amine (2) to react in a solvent A in the existence of a chiral catalyst, and then collecting myrcene amine (3) from a reaction product; and (2) carrying out acidic hydrolysis on the myrcene amine (3) to obtain d-citronellal (4). The structure of the chiral catalyst is as follows: [Rh(PS-Binap)2]<+>Y<->. The method has the characteristics of being mild in reaction condition, simple in operation, high in stereoselectivity, high in yield, simple in catalyst recovery and the like, and can be applied mechanically in cycle.

The invention discloses a catalyst for decomposition of ozone in gases and a preparation method of the catalyst. The preparation method comprises the following steps of S1, preparing fibrous porous graphitized carbon black, and obtaining the fibrous porous graphitized carbon black; S2, preparing the catalyst for the decomposition of the ozone, taking an electrolyte solution, using an electrochemical deposition method to deposit the electrolyte solution in the fibrous porous graphitized carbon black, in electrochemical deposition, a temperature being 85-95 DEG C, voltage being 2-5 V, and conduction time being 1-3h; and taking out and curing, a curing temperature being 300-350DEG C, curing time being 30-60min, cutting off, and obtaining the catalyst for the decomposition of the ozone. According to the catalyst for the decomposition of the ozone in the gases and the preparation method of the catalyst, the fibrous porous graphitized carbon black is regarded as a carrier, cerium, manganese,iron and nickel are regarded as main active components which are evenly covered in holes of the carrier, catalytic efficiency is high, activity is high, heat stability is good, life is long, dust falling off is little, a preparation technology is simple, the cost is low, and use is safe without hidden danger.

The invention discloses a system and a method for controlling an output power of an electric heater. The system mainly comprises a collection unit, a duty ratio control unit and a thyristor control unit, which are electrically connected with one another in sequence. The method comprises the steps as follows: the collection unit collects an AC power cycle, an AC power voltage and an indoor temperature; the duty ratio control unit receives collected AC power cycle, AC power voltage and indoor temperature, obtains a first duty ratio value according to the AC power cycle, the AC power voltage and the indoor temperature, and obtains the duty ratio value of a thyristor control signal according to the first duty ratio value, the AC power voltage and the indoor temperature; and the thyristor control unit is used for receiving the duty ratio value of the thyristor control signal, and controlling opening and closing of a thyristor according to the duty ratio value of the thyristor control signal, so that the output power of the electric heater is controlled. The requirements of a user on indoor temperature stability and comfort are met by properly adjusting and reducing the output power of the electric heater.

The invention relates to a micro-nano cellulose compound. The micro-nano cellulose compound comprises micro-nano lignocelluloses, and graphene material dispersed in the micro-nano lignocelluloses; themicro-nano lignocellulose comprises 10 to 35wt% of lignin. According to the preparation method, utilization of the thin layer characteristic of graphene material is adopted, the graphene material ismixed with the cellulose raw material containing lignin, so that intercalation of the graphene material into the cellulose raw material containing lignin is realized, synergistic lignin peeling is realized, and the micro-nano lignocelluloses is obtained. In the whole process, no chemical agent is used; operation is simple and easy to control; in the preparation method, graphene is adopted for intercalation, lignin degradation pre-treatment of the cellulose raw material containing lignin is not needed, and the micro-nano cellulose compound is obtained through direct peeling, the preparation isfriendly to the environment, and no pollution is caused. In the preparation method, mechanical pre-treatment and high pressure homogenizing are combined to prepare the micro-nano cellulose compound, so that blocking of high pressure homogenizers in crushing process can be avoided, and wearing is reduced.

The invention relates to a radial tidal current river reach riprap falling distance prediction method, and the method comprises the following steps: establishing a radial tidal current river reach water flow condition prediction model based on a one-dimensional long river reach tidal current prediction mathematical model and a two-dimensional hydrodynamic mathematical model by carrying out a riprap settlement process water tank test, and finally, predicting the riprap falling distance in the radial tide process based on the radial tide reach water flow condition prediction model, a falling distance formula and a throwing construction control condition. By the adoption of the method, the riprap falling distance of the radial tidal river reach can be accurately predicted, the construction efficiency and quality are greatly improved, and reference and basis are provided for prediction of the riprap falling distance of the similar tidal river reach in the future.

The invention relates to a study to the influence of the rainfall pattern to the ecologic system in the field of ecology, in particular to a device for controlling rainfall shift and an application method thereof. The device comprises a rain gutter, a flow guiding pipe and branch pipes, wherein the rain gutter inclines downwards, a port of the rain gutter is inserted in one end of the flow guiding pipe in a conical shape, a covering part is arranged on the conical part of the rain gutter, the flow guiding pipe is connected with the branch pipes through a three-way connector, the branch pipes are connected to the three-way connector, an end plug is arranged at the tail end of each branch pipe, holes are arranged on the branch pipes, the distances between the corresponding holes on each branch pipe and the three-way connector are identical, and the aperture of each branch pipe is gradually increased from the end where the three-way connector is connected to the tail end. The inclined rain gutter is erected on the ground with previously reduced rainfall, the area of the rain gutter is determined according to the concrete requirement, and the intercepted rainfall flows to a rain trap along the rain gutter and flows to the branch pipes through the flow guiding pipe and then flows to the place with prospective water increasing through the drilling holes on the branch pipes. The invention is scientific and accurate, convenient for implementation and low in cost and meets the requirements of field conditions.

The invention discloses a preparation method of photo-crosslinked chitosan-methacrylic acid nanoparticles, which comprises the following steps: S1, adding 2-methacrylic anhydride into a chitosan solution for reaction to obtain chitosan-methacrylic acid; S2, preparing a chitosan-methacrylic acid solution with a certain concentration, and adding a photoinitiator; S3, adding the solution prepared inthe S2 into a mixed oil phase of cyclohexane and n-hexanol, and adding a surfactant triton X-100 to prepare a W / O microemulsion; and S4, irradiating the microemulsion prepared in the S3 with ultraviolet light, and carrying out centrifugal separation to obtain the nanoparticles. The method is used for preparing the nanoparticles which can be encapsulate biomacromolecules such as protein and polypeptide and maintain the biological activity of the biomacromolecules.