36results about How to "Overcome high prices" patented technology

The invention discloses a preparation method of a chiral fluorescent nanoparticle based on a hyperbranched conjugated polymer. The method is characterized by comprising the following steps of: preparing a hyperbranched polymer containing 9,9-dioctylfluorene and a bithiophene unit into a trichloromethane solution of which the solubility is 1*10<-3> to 1*10<-1> mg/mL; and adding one of (R)-limonene or (S)-limonene into the trichloromethane solution of the copolymer together with methanol, and mixing uniformly to obtain a stable turbid solution, wherein the volume ratio of the (R)-limonene or (S)-limonene to the methanol to the copolymer is (1-8):(8-1):1. In the method, a solvent chiral transfer technology is applied to the preparation of a hyperbranched polymer chiral fluorescent nanoparticle with a hyperbranched polymer, so that the problems of high price of a chiral reagent, complex synthesis steps and the like existing in the conventional method for synthesizing the hyperbranched polymer chiral fluorescent nanoparticle are solved.

The invention discloses a method for preparing a porous polymer micro needle by using a template method and an application thereof. The method comprises the following steps of: (1) dissolving a polymer and a template agent in a solvent to prepare a polymer solution; (2) filling the polymer solution into a micro needle mould; (3) removing the solvent in the obtained micro needle mould to obtain a solid micro needle; (4) removing the template agent in the obtained solid micro needle to obtain the porous polymer micro needle. By improving the overall process flow design of the preparation method,the method can solve the technical problems of a complex preparation process, harsh conditions, a complicated process, high price, difficult control of the pore structure and size, difficult large-scale production and application and the like of the porous polymer micro needle, the obtained porous polymer micro needle can be used for tissue fluid extraction and transdermal administration, such asskin tissue fluid and blood extraction and transdermal administration of proteins, polypeptides and small molecular drugs in cosmetic, hair growth, immunity, treatment and other applications.

The invention discloses a novel resurfacing welding cored welding strip which consists of a steel tube circled by steel strips and drug powder wrapped in the steel tube, the steel strips comprises an upper steel strip and a lower steel strip which can be purchased in the market. The shape of the steel tube circled by steel strips is that the longitudinal cross section is long flat form or rectangle-like shape, the longitudinal length is determined at will, and the steel tube can be cut out at will or winded into a tray according to requirements. The transverse edges of the upper steel strip and the lower steel strip are connected at the upper steel strip side in a related joint form, and the drug powder is filled in the steel tube circled by the steel strips evenly with the filling rate being 20-80%. According to the different types of resurfacing metals, the content of alloy element in the resurfacing welding cored welding strip is different. The cored welding strip has simple production equipment and technique, and low production cost, thus overcoming the defect that alloy welding filament used for filament resurfacing welding is difficult to produce and the problems of large investment on production equipment, high production cost and expensive price in cored welding filament production.

The invention provides a method for catalytically synthesizing isobornyl methacrylate by activated carbon supported stannic chloride, which is characterized by using isomerized solution obtained by isomerizing alpha-pinene by metatitanic acid as the raw material and using the activated carbon supported stannic chloride as a catalyst, directly esterifying the isomerize solution, the activated carbon supported stannic chloride and (methyl) acrylic acid without additional solvents, filtering the esterified solution to remove the catalyst and then directly distilling the esterified solution without washing to obtain isobornyl acrylate (methyl). The method has the following advantages: the isomerized solution can be directly esterified without being purified and the esterified solution is directly distilled without being washed to obtain isobornyl acrylate (methyl). The synthetic method has the advantages of low energy consumption, low environmental pollution, good isomerization and esterification reaction selectivity, high yield and the like.

The invention provides a fluorogenic culture medium of Enterobacter sakazakii, a test kit and a test method thereof, and relates to a method for testing microbe and a composition used by the method. The fluorogenic culture medium comprises the compositions as follows: 8 to 20 grams of peptone, 4 to 7 grams of beef extract powder, 4 to 7 grams of sodium chloride, 1.0 to 2.0 grams of cholate, 12 to 20 grams of agar, 0.05 to 0.5 grams of X-a-glucopyranoside, 0.01 to 0.04 grams of Na2CO3, 0.3 to 2.0 grams of ferric ammonium citrate, and 0.3 to 2.0 grams of sodium thiosulfate. The test kit consists of the fluorogenic culture medium of Enterobacter sakazakii, an enriched liquid A ,namely buffer peptone water culture medium, and an enriched liquid B, namely modified lauryl sulfate pancreas peptone broth. The test kit is configured simply, and the test method has high sensitivity in detection, so the method is suitable for treating large flux samples.

The invention discloses a method for preparing 2,5-furandimethanol by selective hydrogenation of 5-hydroxymethylfurfural, and the method comprises the following steps: adding the 5-hydroxymethylfurfural, catalyst CuNPs@ZIF-8 and ethanol to a stainless steel closed reactor, charging with H2, and reacting at thetemperature of 120-150DEG C and the pressure of 1-4 MPa for 0.1-5 h. The method adopts the CuNPs@ZIF-8 as the catalyst, and the catalyst not only has large specific surface area, high dispersion of nano copper and good hydrogen adsorption performance, but also has simple preparation, lowprice and reusability. The method overcomes the problem of expensive use of precious metals as catalysts and low efficiency of non-precious metals as catalysts in prior studies.

The invention relates to a method for preparing a barium dititanate (BaTi2O5) ferroelectric film on a silicon (Si) single crystal substrate. The method comprises the following steps of: 1) conveying the Si single crystal substrate growing along the direction of an a axis and a magnesium oxide (MgO) ceramic target material into a settling chamber and vacuumizing the chamber; heating the substrate and introducing high-purity oxygen; irradiating pulse laser beams on the surface of the target material to make the surface of the target material generate plasma plume; and settling the plasma plume on the substrate to form a MgO film buffer layer; and 2) conveying the Si single crystal substrate on which the MgO film buffer layer is settled and a BaTi2O5 ceramic target material into the settling chamber and vacuumizing the chamber; heating the substrate and introducing the high-purity oxygen; irradiating the pulse laser beams on the surface of the target material to make the surface of the target material generate plasma plume; and settling the plasma plume on the substrate to form a BaTi2O5 ferroelectric film. In the method, the single-phase BaTi2O5 ferroelectric film, which can preferably grow along the direction of a b axis on the Si single crystal substrate, can be obtained by building the MgO film buffer layer matched with the BaTi2O5 ferroelectric film; the compatibility of the BaTi2O5 ferroelectric film and a semiconductor process can be achieved; and the BaTi2O5 ferroelectric film is favorable for integrating with the traditional semiconductor device.

The invention discloses a preparation method of photo-response type chirality intelligent nanometer particles. The preparation method is characterized by comprising the following steps of: preparing a trichloromethane solution with a repetitive unit concentration of 3*10<-2> mg/mL from a 9,9-dioctylfluorene-azobenzene alternating copolymer, wherein Mn in the 9,9-dioctylfluorene-azobenzene alternating copolymer is equal to 7770 g/mol and the ratio of Mw to Mn is equal to 2.62; uniformly mixing the solution with alcohol the volume of which is the same as that of the solution; and irradiating the mixture for 1-30 minutes by using levorotatory or dextrotatory polarized light so as to obtain left-handed helix or right-handed helix chirality nanometer particles. By using the preparation method provided by the invention, the problems that when the traditional method is adopted to synthesize the polymer chirality intelligent nanometer particles, a chiral reagent is expensive, synthetic steps are complex and the like are solved; the obtained product is alternatively irradiated by the levorotatory or dextrorotatory polarized light, thus the chiral spiral direction of the nanometer particles can be changed, so as to present the good properties of a photo switch.

The invention discloses a modified macromolecular combined corrosion inhibitor and a preparation method and application thereof. The modified macromolecular combined corrosion inhibitor comprises cassava starch-vinyl acetate-styrene grafted copolymer of 0.1-1.0 g/L, sodium lignin sulfonate of 0.05-0.1 g/L, potassium sorbate of 0.05-0.1 g/L, glycol of 0.01-0.1 g/L and the balance pickling solutions. The preparation method comprises the steps of raw material preparation and preparation. According to the application, the modified macromolecular combined corrosion inhibitor can be applied to preparation of cleaning agents for steel, aluminum, petrochemical equipment, boilers and pipelines. The modified macromolecular combined corrosion inhibitor has the advantages of being free of poisons, low in cost and high in adaptability, obviously inhibiting the corrosion effect of various kinds of organic acid and inorganic acid to metal material, being suitable for acid pickling of the steel and the aluminum in the organic acid and the inorganic acid, being suitable for cleaning of the petrochemical equipment, the boilers and the pipelines, being free of pollution after being used and being safe and convenient to use.

The invention relates to a preparation method and application of a TiO2-SiO2 composite nanofiber supported amorphous alloy catalyst. The preparation method can be sequentially implemented according to the following steps: (1) preparing a TiO2-SiO2 composite nanofiber by taking tetrabutyl titanate and ethyl orthosilicate as raw materials through electrostatic spinning and hot alkali post-processing methods; (2) preparing a solution A by taking a cobalt source and deionized water as the raw materials and dissolving the cobalt source into deionized water; (3) adding the TiO2-SiO2 composite nanofiber to the solution A to form a solution B, and stirring for certain time; (4) carrying out vacuum drying on the solution B to obtain solid powder C; (5) dissolving a boron source into a mixed solution of ethanol and water to obtain a solution D; (6) dropwise adding the solution D to the solid powder C to form a solution E, and stirring and mixing for certain time; and (7) carrying out suction filtration, washing and drying on the solution E to obtain a solid, namely a target product. The preparation method disclosed by the invention has the advantages of simplified process, reduced equipment and low investment cost.

The present invention relates to two processes of preparing silicon material containing sulfo group. The first process has haloalkyl silicon material as the precursor, and includes sulfonation with basic sulfite or bisulfite as sulfonating agent and subsequent exchange of metal ion or ammonium ion with hydrogen ion to obtain silicon material containing sulfo group in the surface. The second process has bisulfite and haloalkyl silane added to produce hydrolysis of ethyl silicate or sodium silicate and the sulfonation of haloalkyl silane synchronously, so as to prepare silicon material containing sulfo group in one step. The present invention has relatively low material cost, short sulfonation time and other advantages, and the silicon material containing sulfo group may be used as catalyst for esterification, etc. and is superior to traditional concentrated sulfuric acid catalyst.

The invention discloses a VoIP voice quality objective evaluating method based on network parameters, and belongs to the voice quality evaluation research field. The method includes the following steps: obtaining network parameters during VoIP conversation; pre-processing the acquired network parameters, pre-processing including obtaining basic main statistics such as mean value, variance, extreme value, mode and median, wherein the network parameters mainly refer to a packet loss ratio, a jitter value and a time-delay value; performing PCA dimensional reduction on the preprocessed data; and finally inputting the data undergoing dimensional reduction to a multivariable linear regression model, and obtaining a voice quality objective evaluation score through calculation. In this way, evaluation of the VoIP voice quality based on the network parameters is conducted. The invention brings forward the new VoIP voice quality objective evaluating method, which can accurately evaluate the voice quality only by monitoring network parameter values with no need of obtaining voice signals.

The present invention relates to color developing culture medium, detecting kit and detection method for Vibrio parahaemolyticus, and belongs to the field of food microbe safety monitoring technology. The detecting kit consists of color developing culture medium comprising bacterial specific enzyme in 0.05-0.95 g and mixed color developing substrate Y-glucoside, enrichment liquid A of pancreatic casitone liquid culture medium and enrichment liquid B comprising sodium chloride, polymyxin and broth. The detection method includes the enrichment culture of the sample in enrichment liquid A and enrichment liquid B, the culture of the two parts of enrichment cultured liquid in the color developing culture medium, and judging whether to exist Vibrio parahaemolyticus according to whether to have smooth raised purple colony of 2-3 mm diameter. The present invention has low cost, high detection sensitivity, short detection period and other advantages.

The invention discloses an adhering self-elevating-type tower crane for hoisting wind power equipment. The adhering self-elevating-type tower crane of the wind power equipment comprises an elevating device, a main framework, a main clasping oil cylinder, a main clasping arm, an auxiliary framework, an auxiliary clasping oil cylinder, an auxiliary clasping arm and an elevating oil cylinder; the axial direction of the elevating oil cylinder is the vertical direction; an oil cylinder seat and a piston rod of the elevating oil cylinder are respectively connected with the main framework and the auxiliary framework; the oil cylinder seat of the main clasping oil cylinder is installed on the main framework; a piston rod of the main clasping oil cylinder is connected with the main clasping arm; the main clasping arm is arranged on the inner side of the main framework; an oil cylinder seat of the auxiliary clasping oil cylinder is installed on the auxiliary framework; a piston rod of the auxiliary clasping oil cylinder is connected with the auxiliary clasping arm; the auxiliary clasping arm is arranged on the inner side of the auxiliary framework; the inner side of the main clasping arm and the inner side of the auxiliary clasping arm are both used for clasping a fan tower section; and the elevating device is installed on the main framework. The tower crane is adhered to the fan tower section repeatedly through the main framework and the auxiliary framework in application, so that the whole tower crane climbs to the required height, and is elevated; the adhering self-elevating-type tower crane for hoisting the wind power equipment has the advantages of light weight, low manufacture cost and less limited conditions.

The invention provides a preparation method of pentafluoroaniline. The preparation method is characterized by comprising the following steps of: (1) adding pentafluorobenzonitrile into sulfuric acid with the concentration of 70-98% for hydrolysis, controlling the hydrolysis temperature to be 70-120 DEG C and the reaction time to be 3-5 hours, and then adding the product into water to separate out, and filtering to obtain pentafluorobenzamide; and (2) mixing the pentafluorobenzamide prepared by step (1) with alkali solution and halogen or hypohalite, preserving the heat for 4-6 hours at -10 to 20 DEG C and then heating up to 70-110 DEG C to carry out Hoffman degradation, controlling the reaction time to be 0.5-3 hours, and then performing steam distillation to obtain the pentafluoroaniline. The method provided by the invention has the advantages that the raw materials are easily available, the process is simple, the operation is convenient, the product purity is high (99% or higher), the yield is high (as high as over 80%), the cost is low, and the method is safe and efficient with energy conservation, consumption reduction and little discharge of three wastes, so the method provided by the invention is suitable for industrial production on a large scale.

The invention discloses a method for preparing a porous polymer microneedle based on a phase separation technology and application of the method. The method comprises the following steps that 1, a polymer is dissolved into a solvent A to obtain a polymer solution; 2, the polymer solution is put into a microneedle mould; 3, the microneedle mould is placed in a poor solvent B, so that phase separation of the polymer in the microneedle mould is facilitated; 4, the poor solvent B is removed, and then the porous polymer microneedle can be obtained. Through the simple and mild phase separation technology, the porous polymer microneedles can be prepared on a large scale, and therefore, the technical problems can be solved that the preparation process of the porous polymer microneedle is complicated, the conditions are harsh, the technology is tedious, the price is high, the pore structure, the size and the distribution are difficult to control, and it is difficult for large-scale production and application. The prepared porous polymer microneedle can be used for interstitial fluid extraction and transdermal drug delivery.

The invention relates to the technical field of the manufacturing technique of flanges, especially relates to a resurfacing composite flange and the manufacturing method, and the main body of the flange is composed of a 201 type stainless steel. A sealing surface of the flange is composed of a 304 type stainless steel, and two parts are connected together through the resurfacing technology. The invention overcomes the problems of high cost and high price of the product only adopted the 304 type stainless steel, dear price and poor acid resistance of the product only adopted the 201 type stainless steel., and the welding property of the 201 and the 304 materials is good. Through resurfacing penetration, the product can embody the advantages of uneasy infiltration and good adhesion, and the flange which contacts with media and the flange which only adopts the 304 type stainless steel have the same acid resistance and antirust ability.

An economical and rapid type test pack for colorimetric determination of a concentration of hexavalent chromium in water in a water body and a determination method are provided. The test pack and the method are characterized in that: an integrated agent kit and a set of standard colorimetric cards are adopted to establish the rapid and convenient method, determination of a sample is achieved by following three simple steps, namely a step of adjusting pH of the sample by pretreatment, a step of performing a chromogenic reaction, and a step of comparing with the prefabricated standard colorimetric cards, and a determination range is 0-0.6 mg/L. Only one time of agent addition is performed in the whole process. Operation is simple. Agents are common and easily available. The test pack and the method are capable of rapidly obtaining a determination result, free of use of any measurement instrument and low in determination cost, provide a novel manner for determination of the hexavalent chromium in water, and have important significance for meeting people and market demands and ensuring drinking water safety.

The invention relates to a preparation method for a medicine intermediate and aims to provide a preparation method for (2S, 3aR, 7aS)-octahydro indole-2-benzyl formate. The method is high in yield and steps are reduced. The method comprises the following steps of: performing cis-form addition on cyclohexene and chloramines-T under the condition of adding a catalyst I2; heating and refluxing diethyl malonate and the product of the cis-form addition to perform ring-closure reaction; hydrolyzing the product of the ring-closure reaction; heating the hydrolysate to perform decarboxylation; performing sodium borohydride reducing chlorination on the decarboxylate; adding trimethyl cyano silane into the product of the reducing chlorination to perform substitution reaction; performing acidolysis on the substitution product by using concentrated hydrochloric acid and acetic acid as catalysts under the condition of heating and refluxing; performing refluxing water distribution on the product of the acidolysis and benzyl alcohol under the action of a strong acid catalyst to perform esterification; and further purifying the esterification product by using a resolving agent.

The invention discloses a magnetic field orientation device for tape casting of magnetic materials. The magnetic field orientation device comprises a support, a first limiting pair roller, a magnetic field orientation roller, a second limiting pair roller and a tape casting base band which sequentially passes through the first limiting pair roller, the magnetic field orientation roller and the second limiting pair roller; tape casting slurry to be subjected to tape casting is carried on the tape casting base band, and the slurry comprises magnetic fillers to be oriented; the casting base band is in contact with the top arc section of the magnetic field orientation roller; the magnetic field orientation roller consists of a fixed shaft, a magnet mounting layer and a rubber sleeve layer; and the magnet mounting layer is provided with a magnetic hard magnet for performing magnetic field orientation arrangement and magnetization on each magnetic filler in the tape casting slurry. The invention further discloses a magnetic field orientation method adopting the device and a product. The magnetic materials are rearranged and oriented under the combined action of magnetic force and gravity, and the magnet is small in size, uniform in strength at all positions, higher in orientation efficiency and better in effect; and a prepared magnetic film material is large in thickness, and the width of the magnetic film material can be expanded as required.

The invention discloses a multi-index voltage disturbance generation device and a multi-index voltage disturbance generation method for wind turbine generator set grid-connected detection. The multi-index voltage disturbance generation device comprises a series synchronous compensation unit, a thyristor control impedance voltage division unit, a voltage transformer PT and a control unit, wherein the series synchronous compensation unit and the thyristor control impedance voltage division unit are used for being connected between a tested wind turbine generator set and an on-site boosting box-type transformer; and the series synchronous compensation unit is arranged at the front end of the thyristor control impedance voltage division unit. According to the multi-index voltage disturbance generation device and the multi-index voltage disturbance generation method, different voltage dip curves are generated according to different application occasions, the stepped recovery process of thepower grid voltage is simulated, the automation degree is high, and various disturbance voltage waveform output such as voltage sag (dip), harmonic wave, voltage fluctuation and three-phase imbalancecan be achieved, thereby creating conditions for grid-connected testing of the wind turbine generator set.

The invention discloses a method for preparing chiral poly-fluorene helical nano-fibers. The method comprises the following steps: adding 9,9-dioctyl fluorene polymer into a (R)-(+)-limonene or (S)-(-)-limonene solution, and heating at the temperature of 70-90 DEG C to be dissolved so as to be prepared into a 0.1-0.4 mg/mL limonene solution; then cooling the limonene solution to room temperature; and finally, putting the limonene solution at the low temperature and self-assembling to obtain the chiral poly-fluorene helical nano-fibers. The influence of freezing time on polymer circular dichroism spectrum (CD), ultraviolet visible (UV-vis) spectrum and fluorescent (FL) spectrum is observed; after an assembly body is stabilized, the solution containing the chiral poly-fluorene helical nano-fibers is obtained. According to the method, a solvent chiral transfer technology is used for preparing chiral poly-fluorene helical nano-fibers by utilizing non-chiral polyfluorene at a first time, so that the problems of expensive cost and complicated synthetic steps of the preparation of spiral nano-fiber chiral reagents in a traditional synthetic method of the chiral polymer are solved.

The invention discloses an organic fiber PVC (Polyvinyl Chloride) multilayered composite flexible pipe and a preparation method thereof, aiming at solving the technical problems of a pipe for agricultural irrigation in the prior art that the corrosion resistance is poor, the toughness and the tensile strength are poor, the anti-cracking performance and the anti-freezing performance are poor, and the price is high. The organic fiber PVC multilayered composite flexible pipe comprises a pipe body, wherein a polyvinyl chloride plastic coating layer is arranged on the inner wall of the pipe body, and a composite plastic film layer is arranged on the plastic coating layer; the pipe body is made of the following raw materials in parts by weight: 28-33 parts of polyacrylonitrile fibers, 8-12 parts of liquid-state silica gel and 3-7 parts of liquid-state PVC stabilizing agent. The pipe has very remarkable advantages in the aspects of cracking strength, acid and alkali resistance, low-temperature resistance and cracking elongation and is a very ideal irrigation and water conveying pipe; mechanized construction is convenient to realize and the working efficiency is improved; the pipe is convenient to operate and maintain in a water conveying and irrigation process and is convenient to repair, and the reliable water supply is ensured.

The invention relates to the field of metal processing, in particular to a metal processing device for coating a bonding copper wire. The invention aims to provide the metal processing device for the coating on the bonding copper wire. According to the technical scheme, the metal processing device for the coating on the bonding copper wire comprises a bottom frame, a swing type friction unit, a coating unit, a winding unit, a coating box and the like; wherein the bottom frame is connected with the swing type friction unit. The bottom frame is connected with the coating unit; the bottom frame is connected with the winding unit; the bottom frame is connected with the coating box; the swing type friction unit is connected with the winding unit; the coating unit is arranged on the side edge of the winding unit; and the coating box is arranged below the winding unit. According to the device, the operation of coating the graphene solution coating on the row of bonding copper wires is realized, and the gap parts of the bonding copper wires can be synchronously coated, so that the working efficiency is greatly improved.

The invention discloses a production process method of an aluminum-coated wooden building template, which belongs to the field of aluminum-coated wooden building templates, and comprises the followingspecific production processes: firstly, sanding, thickening, sawing and the like are carried out on wooden plywood, then special glue is uniformly coated on the surface of the wooden plywood, and then the wooden plywood is coated with an aluminum alloy coiled material with the thickness of 0.1-1 mm; and finally forming a finished product through hot pressing, cold pressing and other processes; and the surface of the aluminum-coated wood building template is coated with an aluminum material, so that the aluminum-coated wood building template has the surface effect of an aluminum template. Meanwhile, the product overcomes the defects that an aluminum template is expensive and cannot be sawn on site.

There is disclosed a fluid bag valve which includes a main fluid pipe, several fluid bags and a valve casing. Fluid inlet and outlet controlling valves are disposed on both ends of the main fluid pipe separately. The several fluid bags are disposed in the valve casing. Each fluid bag is connected with the main fluid pipe by a fluid branch pipe and there are spaces between fluid bags. When the fluid bags are filled with pressure fluid, each pair of fluid bags tightly contact, so the valve presents the closed state. When the fluid in the bag is discharged, the fluid bags are separated each other, so the valve presents the open state.

The invention discloses a rape seed cake compound corrosion inhibitor and a preparation method and application thereof. The rape seed cake compound corrosion inhibitor comprises, by weight, 0.1-1.0g/Lof rape seed cake meal extract, 0.05-0.5g/L of high polymer, 0.1-0.5g/L of anionic surfactant, 0.01-0.1g/L of diethylamino pentyne diol, and the balance a pickling solution. The preparation method comprises the following steps: mixing and uniformly stirring raw materials according to the formula ratio to obtain the target rape seed cake compound corrosion inhibitor. The rape seed cake compound corrosion inhibitor is applied in acid pickling of iron and steel materials.

The invention provides a preparation method of 2,2-dimethyl-1,3-dioxolane. The method comprises the steps that: under a cyclization reaction condition, ethylene oxide and acetone contact a catalyst, such that a mixture is obtained; and the 2,2-dimethyl-1,3-dioxolane is separated from the mixture, wherein the catalyst comprises ionic liquid 1-alkyl-3-methylimidazolium salt and anhydrous zinc chloride. The invention also provides a preparation method of ethylene glycol. According to the 2,2-dimethyl-1,3-dioxolane preparation method provided by the invention, the catalyst composed of the ionic liquid 1-alkyl-3-methylimidazolium salt and anhydrous zinc chloride is adopted, such that defects such as high catalyst cost and severe environment pollution of prior arts in which zinc trifluoromethanesulfonate is adopted as a catalyst for catalyzing the reaction of ethylene oxide and acetone are solved. Also, catalytic efficiency is improved compared with a method for using single anhydrous zinc chloride as a catalyst to replace zinc trifluoromethanesulfonate, and catalyst recycling and reutilization can be facilitated.

The invention relates to a chewable tablet, in particular to a qi-reinforcing-and-skin-nourishing schisandra chinensis chewable tablet and a preparation method thereof. The qi-reinforcing-and-skin-nourishing schisandra chinensis chewable tablet comprises the following raw materials of schisandra chinensis, white poria, fresh ginger, astragalus mongholicus, liquorice, mannitol, Kluyveromyces marxianus, an adhesive and a lubricating agent. The qi-reinforcing-and-skin-nourishing schisandra chinensis chewable tablet is prepared through the following steps of mixture preparation, mixed fermentation, wet particle preparation, wet particle drying, whole particle total mixing, tablet pressing, sterilization, packaging and the like. The qi-reinforcing-and-skin-nourishing schisandra chinensis chewable tablet has the effects of qi reinforcing and skin nourishing and lung moistening for cough arresting and meanwhile has the advantages of being good in mouthfeel, convenient to carry, simple in preparation method and the like.