218results about How to "Abundant and easy to get raw materials" patented technology

The invention discloses a method for preparing a suaeda salsa biogenetic salt. The method comprises the following steps of: taking parts, such as stems and leaves, above roots of fresh suaedasalsa; juicing; adding water into residual solid parts and extracting once; mixing the two liquids; and performing enzymolysis, boiling, decoloration, heavy metal removal, concentration and crystallization onthe mixed liquid, thus obtaining a finished product. The yield of the product is 1.2-2.1%. The product comprises inorganic salts serving as major ingredients and natural organic matters serving as minor ingredients. The inorganic salts mainly comprise sodium chloride, potassium chloride and magnesium sulfate as well as a trace amount of trace elements (Ca, P, Fe, Zn, Se, I, Cu and Mn) and the organic matters in the product mainly comprises vitamins, amino acid and polysaccharide. During preparation, any chemical substances are not required; furthermore, the raw materials are abundant, readilyavailable and low in cost, and have extremely high economic additional value; and moreover, the preparation method is simple and feasible, is easy to produce and operate, and is wide in market prospect.

The invention belongs to the technical field of agricultural light conversion, and discloses an application of carbon dots in the light conversion of agricultural production as an agricultural light conversion material. Carbon dots are directly used as an agricultural light conversion material and applied to agricultural production; an excellent light conversion effect is obtained, and the cost is low. The carbon dots are used as an agricultural light conversion material in the light conversion of agricultural production; and the carbon dots are at least one of red light carbon dot and blue light carbon dot. Compared with other fluorescence materials, the used carbon dots have the advantages of easily-available and abundant raw materials, simple synthesis process, green and environment-friendly technology, and no aftertreatment pollutant, and the industrial massive production can be realized. The prepared fluorescent carbon dots are small in size (less than 10 nm), are nontoxic, have good biocompatibility, a stable luminescent property, and a low cost, can be used as a light conversion agent to promote the production of various crops, and improve the yield and quality of crops.

The invention discloses a preparation method of a sleeve-fish skin low-molecular-weight collagen peptide. The preparation method adopts a compound enzyme composed of three enzymes including trypsin, papain and alkali protease, the three enzymes carry out a synergistic effect on sleeve-fish skin collagen under an ultrasonic condition to carry out enzymolysis on the sleeve-fish skin collagen; and then, steps of de-bittering, de-coloring, concentrating in vacuum, and spraying and drying can be performed to obtain the sleeve-fish skin low-molecular-weight collagen peptide. The preparation method disclosed by the invention is simple, the process is easy to control and no environmental pollution exists; the enzymolysis time is short and the production efficiency is high; the enzymolysis speed and the extracting rate of the collagen peptide can be improved; and the sleeve-fish skin low-molecular-weight collagen peptide obtained by using the preparation method is easy to digest and absorb, has no objectionable odors, uniform color and luster and good biological performance, and is relatively easy to digest and absorb by a human body.

The present invention discloses one kind of aryl formyl piperazine compound and its preparation process and application in preparing medicine. The compound and its medicinal salt have the general expressions shown. The compound may be used in preparing medicine for arrhythmia. The compound has rich material source, mild reaction condition and simple preparation process and post-treatment.

The invention discloses a method for preparing antioxidant peptide from shrimp shell. The method comprises the steps that: shrimp shell obtained as a byproduct from shrimp processing is used as a raw material, then dried, ground and sieved, and added with water to prepare a shrimp shell powder solution with a certain mass fraction, the pH of the solution is regulated and then alkaline proteinase is added for hydrolysis at constant temperature, enzyme inactivation, cooling and centrifugation are carried out after the reaction ends, and supernatant is subjected to ultrafiltration and then concentrated and freeze-dried to obtain shrimp shell-type antioxidant peptide. Compared with the existing antioxidants, the antioxidant peptide disclosed by the invention is simple in preparation method, rich and highly-available in raw material which is shrimp shell obtained as the byproduct from shrimp processing, low in cost and low in molecular weight, can rapidly enter blood circulation to be absorbed and utilized by a human body, has good antioxidant effect, high safety and no toxic or side effects, and is a top-quality antioxidant peptide provided for the fields of food, cosmetic and medicine..

The invention discloses a preparation method of cheap single-component alkali-activated cement and an application method thereof. The preparation method comprises the following steps: respectively grinding salic raw material, calcareous raw material, cheap salt containing alkali metal and carbonaceous raw material; then mixing according to a certain sequence and proportion so as to generate a raw material; quickly heating the raw material powder till a preset maximum temperature; after preserving the temperature for 0.5-3.0 hours, quickly cooling till a normal temperature to obtain clinker; grinding the clinker till the fineness of cement so as to obtain cement; adding water into the cement to be mixed into slurry, wherein the water is added till the slurry of water and cement can be compacted through vibration in a mold; after the slurry added in the mold is compacted through vibration, moisturizing and curing for 1-3 days at the temperature of 50-80 DEG C so as to obtain required strength; and doping other aggregates and inert fillers in the cement slurry according to the requirement. The raw materials of the cheap single-component alkali-activated cement are rich, easily obtained and low in cost; and the whole preparation process is low-carbon and low in energy consumption, and the obtained product has good early strength so as to establish a new way for cement material.

This invention provides substituted benzimidazole compounds shown in common formula (I) and their pharmacologically permitted salts. The definitions of R1, R2, R3, R4 and n in common formula (I) are mentioned in the instruction. Pharmacological experiments show that, this kind of compounds and their pharmacologically permitted salts or their solvates or hydrates perform excellent anti-hepatitis B virus (anti-HBV) activities and are especially inhibitory to DNA replication of HBV. They are thus promising as anti-HBV drugs. This invention also provides a method to prepare this kind of compounds.

The invention discloses a preparation method of a subcritical raisin extract and an application of the subcritical raisin extract in cigarettes. The subcritical raisin extract is characterized by being prepared by the following method: pretreating raw materials and extracting at an extraction pressure of 0.5MPa to 3MPa at the temperature of 0-50 DEG C by taking butane, propane or dimethyl ether as a subcritical extracting solvent, wherein an entrainer used is 55% to 95% ethanol. After being added with the subcritical raisin extract, cigarette shreds are free of peculiar smells in smoke and harmonious in fragrance; due to the subcritical raisin extract, the fragrance quality and the smoke fineness and tenderness of the cigarettes are both improved; the fragrance amount of the cigarettes is increased; impurity gas and irritation of the smoke are reduced; the overall smoking quality of the cigarette is improved. The most prominent characteristics of the subcritical raisin extract prepared by the method disclosed by the invention are that the subcritical raisin extract prepared by the method can be used as a cigarette additive, the application of the additive does not change the original performances and processing technique of the cigarettes, the fragrance quality of the cigarettes is improved and the sensory comfort degree of the cigarettes is increased, so the subcritical raisin extract has better significance and value for actual production.

The invention discloses a preparation method of a highly dispersed nanocatalyst. The method comprises the following steps: (1) respectively preparing a metal salt solution and a precipitant solution,continuously dropwise adding the metal salt solution into the precipitant solution under continuous stirring, continuing the stirring, performing a primary low-temperature hydrothermal reaction, filtering, washing and drying the obtained product, performing a secondary low-temperature hydrothermal reaction, and performing filtration and vacuum drying on the obtained reaction product to obtain a metal oxide carrier rich in oxygen vacancies; and (2) loading a noble metal on the metal oxide carrier by adopting an impregnation technology, and performing temperature-programmed reduction in a hydrogen atmosphere to obtain the highly dispersed nanocatalyst. The method has the advantages of low cost, rich and easily available raw materials, mild preparation conditions and strong universality; andthe highly dispersed nanocatalyst prepared by using the oxygen vacancy supported noble metal has the advantages of good catalytic activity, good product selectivity and great potential industrial catalytic application potential.

The invention discloses an application of Chinese yam extractives in cigarettes. The Chinese yam extractives are prepared according to the method that a. a fresh Chinese yam is washed, cut into slices, dried and smashed; b. the Chinese yam is extracted and condensed through ethyl alcohol with the certain concentration to obtain Chinese yam alcohol extraction liquid; c. material residues after alcohol extraction are further extracted through water; d. after water extraction liquid is filtered and condensed, ethyl alcohol is added to the water extraction liquid, precipitating, standing and filtering are conducted, and precipitates are dried to obtain Chinese yam crude polysaccharide; e. deproteinization and purification are conducted. When being applied in a cigarette perfuming link, Chinese yam alcohol extraction liquid can improve perfuming quality, cover sundry flavors, increase clean aroma and sweet aroma, ensure that smoke is more delicate, and improve cigarette smoking and absorbing comfort. After being dissolved in water and used as cigarette material liquid, the Chinese yam crude polysaccharide plays a role in thickening smoke, reducing stimulation and improving mouthfeel, and can reduce the amount of harmful ingredients such as cigarette smoke free radicals. The application of the Chinese yam extractives in the cigarettes does not change the previous performance and the previous processing processes of the cigarettes, improves perfume quality of the cigarettes and sense organ comfort of cigarette smoking, and also has practical production significance and value.

A C13-C18 nylon with long carbon chain is prepared from the dibasic acid with long carbon chain and prepared by fermentation method through synthesizing. Its advantages are low hydroscopicity, high size stability and toughness, and high resistance to low temp.

The invention discloses a desulphurization and denitration agent based on waste biomass and a preparation method thereof. The desulphurization and denitration agent contains zeolite catalysts loaded with metal oxides, modified active carbon, waste biomass and a biomass binder. The preparation method of the desulphurization and denitration agent based on the waste biomass comprises the following main steps: firstly, crushing the solid-state biomass waste, the zeolite catalysts and the active carbon to obtain powder; then, uniformly mixing the crushed materials in the biomass binder; and finally, drying and forming the mixed materials to obtain the desulphurization and denitration agent disclosed by the invention. The desulphurization and denitration agent disclosed by the invention not only can be directly used for purifying a high-temperature flue gas of over 600 DEG C, but also can be used for effectively realizing treatment of wastes with processes of wastes against one another, i.e., the biomass waste including crop straws, crop processing waste, timber processing waste or municipal domestic waste, and the like are effectively used to govern flue gas pollution.

The invention relates to an ionic eutectic solvent capable of effectively reversibly absorbing ammonia gas, and belongs to the technical field of gas separation and purification. The eutectic solventis formed by proton-type imidazole ionic liquid as a hydrogen-bond acceptor and polyol as a hydrogen-bond donor; therefore, raw materials are rich and are easy to get, a synthetic process is simple, and large scale preparation is convenient to carry out; moreover, because of a multi-site hydrogen bond effect among hydrogen protons in ionic liquid, a hydroxyl group in the polyol and NH3 molecules,high-efficient absorption of NH3 is facilitated; by adopting a heating or pressure reduction way, the NH3 can be completely desorbed out, and a regenerated absorbing agent can be recycled, and the absorption performance keeps stable. The solvent has the advantages of simple synthesis, low viscosity, good stability, high NH3 absorption quantity, easiness for desorption, recyclability and the like,therefore, the solvent is an absorbing agent which extremely has application prospects and can perform purification and separation on the NH3.

The invention provides a method for preparing a composed calcined dolomite by taking the byproduct of brine ( a saturated liquor which is mainly magnesium chloride ) after potassium extraction or the bischofite separated out from the brine by naturally evaporating as the materials to react with excess lime to prepare the floccule mixture of magnesium hydrate and calcium hydroxide; then the mixture is calcined and dehydrated under the temperature of 400 to 1200 DEG C after the mixture is deposited, filtered, washed, dried and cracked. The materials of the invention are easily obtained and cheap; the production process is simply and easily controlled; no carbon dioxide is discharged; besides, the invention basically has no corrosion to a device. The mol ratio of MgO to CaO in the composed calcined dolomite is within the range of 1:0.8 to 1:1.2; the activity of water is 25 to 36 percent; the composed calcined dolomite is applicable for the areas rich in the resource of magnesium chloride to use a Pidgeon process to produce the metal of magnesium.

The invention discloses a strong-acid-resistant high-strength anticorrosive paint which comprises the following components in parts by mass: 25-28 parts of epoxy resin, 22-26 parts of polyurethane, 9-13 parts of silicon dioxide, 5-7 parts of titanium dioxide, 3-6 parts of zinc powder, 2-5 parts of barium sulfate, 4-6 parts of graphite, 7-9 parts of diacetone alcohol, 5-9 parts of polytetrafluoroethylene, 7-11 parts of polydimethylsiloxane, 4-8 parts of carboxymethyl cellulose, 1-3 parts of tributyl phenol polyethenoxy ether and 33-45 parts of deionized water. The invention also discloses a preparation method of the strong-acid-resistant high-strength anticorrosive paint. The product can resist corrosion of strong acid and strong alkali, performs the protective and anticorrosive functions on equipment in extreme weather, and has the advantages of excellent mechanical properties, high scrub resistance, high aging resistance, high powdering resistance, higher weather resistance, higher wear resistance, better high-temperature resistance, high safety and environment friendliness.

The environment friendly granular road snow removing agent consists of side product from corn starch production process in 14-80 weight portions, inorganic matter in 15-64 weight portions and organic acid salt in 5-22 weight portions, and through separating grinding into fine powder, mixing via stirring, pelletizing and drying. The environment friendly granular road snow removing agent is spread to icy and snowy road to avoid slide, thaw ice and snow and loosen ice and snow, and has no corrosion to road, no environmental pollution, simple production process and low cost. It may be used widely for eliminating ice and snow in cold area.

The invention discloses a nanometer porous NiFeMn alloy / oxide composite electrode and a preparation method thereof. An alloy strip with flexibility is successfully fabricated by controlling differentNiFeMn constituent proportions, a nanometer porous alloy precursor can be fabricated by a dealloying method, and a layer of mixed-valence doping thin-layer oxide is automatically grown on a surface ofthe electrode and holes by further polarization processing. Iron is low in cost, a ternary NiFeMn composite electrode is fabricated by substituting copper with iron, and the raw material is rich andavailable; and actual supercapacitor application test founds out that compared with a binary NiMn system, the ternary NiFeMn composite electrode has the advantages that the specific capacitance can reach (400-1,500) F / cm<3>, the working voltage window can reach 1.2-1.5V, and the energy density (15-80 mWh / cm<3>) of the electrode is effectively improved.

The invention discloses a Bi2S3-BiFeO3 composite visible-light-driven photocatalyst prepared through in-situ growth with a chemical corrosion method and efficient in visible light response and an application of the Bi2S3-BiFeO3 composite visible-light-driven photocatalyst. According to the method, a sol-gel method and the chemical corrosion method are adopted synchronously. The method comprises the following steps: BiFeO3 is prepared firstly with the sol-gel method, then L-cysteine is taken as a sulfur source, and the Bi2S3-BiFeO3 composite visible-light-driven photocatalyst having different proportions of Bi2S3 to BiFeO3 are synthesized on the BiFeO3 surface through in-situ growth with the chemical corrosion method. A xenon lamp is taken as the light source, malachite green is taken as an organic pollutant degradation model, and a composite material and a malachite green solution are sufficiently mixed for photocatalytic degradation and simulation of malachite green organic pollutants in a water environment. With adoption of the method, more than 98% of malachite green in water is removed within 1 hour, the concentration is 20 mg / L, the photocatalyst has stable performance and a nanoflower structure, and the Bi2S3-BiFeO3 visible-light-driven photocatalyst which is synthesized successfully for the first time has great significance and broad development prospects in sewage treatment.

The invention discloses a method for preparing antioxidative peptide by using cod to process a by-product. A cod processed by-product cod fillet is taken as a raw material, the cod fillet having rich protein is subjected to high- temperature and high pressure boiling and crushing, water is added for preparing a cod fillet solution, the pH value is adjusted, pancreatin is added and is hydrolyzed under constant temperature, enzyme deactivation is carried out after the reaction is completed, refrigerated centrifugation is carried out, a supernatant is taken, and then is subjected to the steps of ultrafiltration, concentration and freeze drying to obtain the cod fillet antioxidative peptide powder. The obtained peptide powder has good removing rate on DPPH free radical, hydroxyl radical and superoxide anion, and is an excellent anti-oxidant. The peptide powder has the characteristics of light yellow, no bitter taste, and slight fishiness, the molecular weight can be controlled to less than or equal to 1000 Da, and the polypeptide total protein is 89.56%. The used cod fillet is the cod processed by-product, the cost is low, the prepared antioxidative peptide has the advantages of good antioxidation effect, high security, and no toxic and side effect, and high-quality antioxidative peptide is provided for food, cosmetic and medicine industries.

The invention discloses a preparation method of modified blue-green algae biochar, wherein the preparation method comprises the steps: S1, washing blue-green alga cleanly, carrying out freeze drying,grinding, pulverizing the blue-green algae, and carrying out carbonization treatment in an inert atmosphere; grinding and sieving the blue-green algae powder, soaking the blue-green algae powder in anacid solution, washing with water to be neutral, and drying to obtain blue-green algae biochar; and S2, dissolving an iron-containing compound and the blue-green algae biochar in an ethanol aqueous solution, placing the solution on a stirrer, uniformly stirring and mixing, dropwise adding a reducing agent in an inert atmosphere, continuously stirring after dropwise adding is finished, carrying out centrifugal separation on the obtained mixed solution to remove supernate, and washing and drying the obtained solid to obtain the modified blue-green algae biochar. On one hand, the blue-green algae waste is used as the raw material, the raw material is rich and easy to obtain, and a new thought is provided for resource utilization of the blue-green algae waste; on the other hand, the preparedblue-green algae biochar loaded nano-iron is uniformly dispersed, the problems that blue-green algae is difficult to treat and utilize, nano-particles are prone to agglomeration and passivation and the like are effectively solved, and the arsenic adsorption and removal effect of the material is improved.

The invention relates to a hole-tray vegetable cultivation substrate. The hole-tray vegetable cultivation substrate is characterized by comprising, by weight, 10%-20% of turf, 10%-20% of perlite, 10%-15% of vermiculite, 0.3% of compound fertilizer of potassium sulfate, 5% of rotten goat manure and the balance abandoned fermented tree branches. Due to the fact that the tree branches are taken as main raw materials of the hole-tray vegetable cultivation substrate, usage amount of the turf is decreased, environmental pollution brought by burning of the abandoned tree branches is reduced, waste is made profitable, environment is protected, the raw materials are abundant and easily available, and cost is low. Compared with a substrate taking the turf as main raw materials, the substrate mainly made of the abandoned tree branches is lowered by 40%-50% in cost, and balanced nutrients are favorable for vegetable growth and increase of production.

The invention relates to a combined foaming polylactic acid heat-resistant flame-retardant modified material and a preparation method of a product, and belongs to the technical field of biodegradablefoaming materials. The preparation method comprises the following steps: weighing a flame retardant, a chain extender, a peroxide, a fatty acid amide compound refined from natural vegetable oil, a modifier, a degradable auxiliary material, polylactic resin and a nucleating agent in parts by weight; mixing the raw materials in a mixer according to the formula; melting, reacting and extruding the mixture in a twin-screw extruder at 160-210 DEG C to obtain polylactic acid flame-retardant modified masterbatch. The obtained polylactic acid flame-retardant modified masterbatch and a compound chemical foaming agent can be further mixed through various plastic processing modes, then a compound physical foaming agent is injected, and in cooperation with a supercritical fluid foaming agent conveyingdevice, the mixture is processed into the product in a large-scale mode. According to the technology, the foaming rate can be increased, the comprehensive performance of the foaming material is effectively improved, and the prepared foaming material and product have low apparent density and are widely applied to the fields of heat insulation, buffering and packaging.

The invention discloses a preparation method and an application for a bismuth sulfide-bismuth ferrate composite visible-light photocatalyst. The method comprises the following steps: dispersing certain amounts of a sulfur source and bismuth ferrate into an absolute ethyl alcohol solvent in proportion, carrying out ultrasonic dispersion, transferring the obtained mixture to a polytetrafluoroethylene lining reaction vessel, and carrying out a reaction; after completion of the reaction, subjecting obtained brown or black precipitate to centrifugal separation, and carrying out washing and drying so as to obtain the bismuth sulfide-bismuth ferrate composite photocatalyst with different proportions; and by adopting a halogen tungsten lamp as a visible light source, and a dye rhodamine B as an organic pollutant, fully mixing composite catalyst powder and a rhodamine B solution so as to photocatalytically degrade the organic pollutant rhodamine B in a simulated water environment. The method provided by the invention can remove 96% or above of the dye rhodamine B in water in 3 hours, and the catalyst has good activity and stable performances. The bismuth sulfide-bismuth ferrate is a composite visible-light photocatalyst, can realize photocatalytic oxidation treatment of wastewater by directly utilizing solar energy, and has good development prospects in the field of wastewater treatment.

The invention discloses a rose pie and a preparation method of the rose pie. The rose pie comprises the following raw materials of, by weight, 3 to 4 parts of specially-prepared Pingyin double-petal red rose powder, 4 to 5 parts of Pingyin double-petal red rose syrup, 23 to 65 parts of wheat flour, 3 to 4 parts of vegetable oil, 4 to 5 parts of eggs, 0.3 to 0.5 part of salt, 0.2 to 0.3 part of food yeast powder, and 12 to 14 parts of Pingyin double-petal red rose jam, wherein the specially-prepared Pingyin double-petal red rose powder, the Pingyin double-petal red rose syrup, the wheat flour, the vegetable oil, the eggs, the salt and the food yeast powder are crisp materials and the Pingyin double-petal red rose jam is stuffing. According to the method, the rose syrup is added in the dough kneading process so that the flour can ferment more rapidly and completely and dough can be softer; the rose syrup also can achieve the bacteriostasis and sterilization effects and the kneaded dough is better in quality; the fragrance of a product is improved through the fried rose powder. The rose pie prepared through the method is golden yellow, flat in surface, smooth in pie edge, clear and tidy in marks and soft in taste, and the rose pie has the rose jam fragrance and the faint scent of the pure rose syrup.

The invention relates to a novel substituted benzoyl urea compound and a preparation method and application thereof. The compound has the structure general formula disclosed in (I), wherein definitions of R1, R2, and R3 are described in the specification, and the compound can be used as a micromolecule inhibitor of Cyclophilin A (CypA); the CypA is a protein with the activity of Peptidyl-prolyl cis-trans isomerase (PPIase), and is related to the in vivo protein folding, assembly and transfer. The current research shows that the CrpA takes part in various physiology approaches, such as autoimmunity depression, HIV-1 invasion infection and the like. Therefore, the compound of the invention can become a novel immunosuppressive drug or anti-HIV-1 drug.

The invention belongs to the field of food biotechnology, and in particular relates to a method for simultaneously preparing high-F ratio oligopeptide and starch sugar from corn gluten meal as a raw material. The pH of a pre-treated corn gluten meal solution is adjusted to be weakly-acidic and hydrolyzed. The supernatant is dried to obtain a starch sugar product; the precipitate is further hydrolyzed and refined to obtain the high-F ratio oligopeptide product. The method disclosed by the invention has the advantages of simple process, less equipment investment and high product yield, and the like; the content of total proteins of the high-F ratio oligopeptide product is higher than 85%, wherein the proportion of dipeptides and tripeptides in the total proteins is higher than 85%, F ratio is greater than 30, the high-F ratio oligopeptide product has good water solubility and good color and flavor, can be widely used in the field of health food and nutritious food; and the glucose content in the starch sugar product is higher than 50%, and the starch sugar product has good water solubility, and can be widely used in food and fermentation industry.

The invention provides a method for preparing a high-density fused quartz ceramic, belonging to the field of ceramic materials. The method comprises the following steps of: catalyzing ethyl orthosilicate to be hydrolyzed to generate silica solution by controlling a hydrolysis condition, coating homogeneous sol on the surface of ultrasonically-dispersed fused quartz powder, controlling a coating technology to obtain the well-coated fused quartz ceramic powder, filtering, drying, levigating, and calcining to obtain the coated powder for pressing and sintering. The dense fused quartz ceramic is prepared by a pressing and sintering technology, the sintering can be promoted due to the high activity of the silica solution in the process of sintering, and the density can be improved. The density of the prepared fused quartz ceramic is more than 98%, the room-temperature bending strength is more than 60MPa, and the phenomenon of devitrification can be avoided. The method provided by the invention is simple in technology and low in energy consumption, raw materials are easy to obtain and low in cost, and the method can be used for preparing the high-performance fused quartz ceramic.

A hot-fusible adhesive of C13-C18 polyamide with long carbon chain is prepared from the dibasic acid prepared by fermenting method through synthesizing. Its advantages are high adhesion, softness and size stability, and excellent resistance to water washing.

The invention relates to a strain capable of producing compound enzyme and a method of using the same to prepare compound enzyme for weaned piglets. The invention enables the problems that conventional feeds for weaned piglets are hard to digest and absorb and cause hypersensitivity to be effectively overcome. The strain provided in the invention is Aspergillus niger HKS11 which is preserved in China General Microbiological Culture Collection Center with an accession number of CGMCC No. 6027; and produced compound enzyme comprises protease, amylase and xylanase. The method of using the strain to prepare the compound enzyme comprises a step of activation of a culture, a step of acquisition of secondary seeds and a step of fermentation and culture in a solid fermentation cylinder. According to the invention, preparation cost is low, raw materials are rich and easily available, and energy saving and environmental protection are realized; when the produced compound enzyme for weaned piglets is added into a piglet feed, the utilization rate of the feed can be improved, productivity of the piglets is enhanced, and healthy growth of the piglets is promoted.