283results about How to "Valid package" patented technology

An interface is provided for managing a plurality of tracked objects, each tracked object associated with a corresponding telemetry device. A request is received from a web browser for at least one action to be performed by the telemetry device. A message including information indicating the at least one action is transmitted, to the corresponding telemetry device. The web browser is configured to display at least one geographical map indication of at least one location of each tracked object.

The invention relates to a water capsule with water and hydrotropic substance as core materials and a manufacturing method of the water capsule. The water capsule is composed of a certain number of water capsule wall materials and the core materials, wherein the water capsule wall materials are compositions of long-chain ester materials and food-grade coagulant aids in specific proportion; the core materials are compositions of pure water, water-soluble substance and the hydrotropic substance. The water capsule is not used as an existing capsule capable of containing oil-soluble flavor substance only, the water and water substance can be included in the water capsule, and meanwhile the single-layer wrapped water capsule is achieved due to the fact that the wall materials are made of the long-chain ester materials and the specific coagulant aids. The water capsule is relatively simple in process; multi-layer wrapping is not needed; the commercial production is easily achieved; raw materials are easily obtained; the water capsule is easy to operate.

The invention belongs to the field of electrochemistry battery, and more specifically relates to a black phosphorus nanosheet-graphene composite film anode used for flexible lithium ion batteries, and a preparation method thereof. According to the preparation method, high purity and large scale black phosphorus blocks are synthesized via mineral substance assistant vapor transporting method with high efficiency; a large amount of clean and high quality black phosphorus sheets are prepared in water via ultrasound treatment; the clean and high quality black phosphorus sheets and high conductive graphene nanosheets prepared via intercalation stripping method are subjected to mixing ultrasonic dispersion; and flexible high-strength laminated composite film is prepared via vacuum filtration. The preparation process of the flexible high-strength laminated composite film is simple and controllable; large scale low cost preparation can be realized; black phosphorus nanosheets are high in capacity, graphene is high in electrical conductivity, and the black phosphorus nanosheets and graphene both possess two-dimensional structures high in flexibility and strength, so that problems the black phosphorus is poor in electrical conductivity and stability are solved, lithium ion battery capacity, cycling stability, and entire energy density are increased, and lithium ion battery electrode integrated flexible design is realized.

The invention belongs to the building material technology field, specially relates to a method for preparing a ceramic permeable brick comprising the following steps: 1) preparation of the bottom blank: crushing the solid waste clinkers and screening the same into coarse grains with a grain size of 2-3mm to get coarse grain solid waste clinkers, wherein the weight percentage of each component is as follows: 60-80% of coarse grain solid waste clinkers, 20-40% of cascade high temperature binders which pass through a 100 mesh screen; choosing the coarse grain solid waste clinkers and the cascade high temperature binders which pass through a 100 mesh screen for stand; sealing and staling the mixture by plastic clothing to get the bottom blank; 2) preparation of the surface course blank: crushing the solid waste clinkers, screening the same into fine grains with a grain size less than 2mm and more than or equal to 1mm; 3) moulding by means of hydraulic press machine of brick; 4) drying the permeable brick green body; 5) calcining the dried permeable brick green body by a silicon carbide bar furnace or a fuel gas shuttle kiln at 1100-1200 DEG C to get the environmental ceramic permeable brick products. The ceramic permeable brick has advantages of high intension and low cost.

The invention discloses a method for preparing an UHTC (Ultra-High Temperature Ceramic) matrix composite material through modification of a UHTC powder basal body. The method comprises the steps of: introducing UHTC powder and a carbon organic precursor into C / SiC with a gas hole ratio of 30 vol% to 40 vol% by adopting a vacuum pressure impregnation way; and performing in-situ reaction on melting silicon and splitting carbon in the basal body, and compacting the material through the combination of RMI (Reactive Melt Infiltration) so as to prepare a C / SiC-UHTC composite material. For one aspect, the SiC basal body protects fibers from being eroded by the melting silicon so as to improve mechanical properties of the material as the C / SiC with the gas hole ratio of 30 vol% to 40 vol% is adopted as a prefabricated body; and for the other aspect, a certain amount of the UHTC powder is introduced into the prefabricated body to improve anti-ablation performances.

The invention provides a biology-breathable cosmetic mask. The biology-breathable cosmetic mask is prepared from, 1%-5% of natural polymer material, 1%-10% of wetting agent, 0.12%-0.25% of cross-linking agent, 0.1%-5% of surface active agent, 0.1%-2% of preservative, 0.01%-1% of acid-base modifier, 0.01%-30% of medicine carrying functional component and the balance distilled water. The pH value of the biology-breathable cosmetic mask is 5.5-8.0. The invention further provides a preparation method of the biology-breathable cosmetic mask. The biology-breathable cosmetic mask can be dissolved quickly and completely in hot water of above 50 DEG C and is swelled only without being dissolved after being placed in normal temperature water; however, the mask can be dissolved gradually after several hours, complete biodegradation is achieved, and no pollution to the environment is caused. The biology-breathable cosmetic mask can be either a transparent thin film or a translucent or opaque thin film.

The invention discloses a high-content water dispersible granule and preparation method thereof, comprising a bulk medicine, EO / PO auxiliary agent, moistening dispersant, disintegrating agent, binding agent, anti-foam agent, fillers or the like. The preparation method comprises: mixing the bulk medicine, EO / PO auxiliary agent, moistening dispersant, disintegrating agent, anti-foam agent, fillers, stabilizer and pH regulator; crushing the mixture into wettable powder; adding aqueous solution of binding agent into the mixture and kneading, regranulating, drying. The high-content water dispersible granule effectively solves the heat agglomeration problem and the EO / PO auxiliary agent effectively enwraps the bulk medicine particles and reduces the influence due to particles agglomeration. The decomposition rate of the high-content water dispersible granule is about 3.5% under the index requirement of 5% after storing for 14d at 54 plus or minus 2degree without easy disintegration and automatic dispersibility reduction phenomena.

The present invention relates to a silk fibroin porous spongy support made from polyvinyl alcohol, and a preparation method and application thereof. The support is made from 60-80 wt% of silk fibroin fiber and 20-40 wt% of polyvinyl alcohol particles; and the support is provided with uniformly distributed micropores, and has a porosity of 85-95%. The preparation method comprises the steps of: 1) extracting silk fibroin from silk to form a silk fibroin aqueous solution; 2) mixing a polyvinyl alcohol solution with the silk fibroin solution; 3) transferring the mixed solution of silk fibroin and polyvinyl alcohol into a dialysis bag, and placing in a polyethylene glycol solution for dialysis concentration; 4) placing the concentrated blend in a plastic mold, and conducting freeze drying; 5) rinsing the dried blend with water, and removing polyvinyl alcohol to form a spongy silk fibroin porous material; and 6) drying the prepared porous support material at room temperature to obtain a finished product. The support is used in tissue engineering, soft tissue repair and drug release.

The invention discloses a method for preparing a coaxially-composite nano material by using a carbon nano tube as a core. The composite nano material using the carbon nano tube as the core comprises the carbon nano tube, manganese oxide, and amorphous carbon from the inside to the outside in sequence, that is to say, the amorphous carbon / manganese oxides / the carbon nano tube (C / MnOx / CNTs) coaxially compound the nano material, wherein the manganese oxides are MnO2, Mn3O4 and MnO, and are abbreviated to MnOx. The method uses the carbon nano tube as the core to prepare the one-dimensional amorphous carbon / manganese oxides / the carbon nano tube (C / MnOx / CNTs) coaxially-compounded nano material, so that the preparation technology is simple, the device requirement is low, and the prepared material is large in specific surface area, and high in stability, capacity and conductivity, and has huge application potentiality in the field of lithium secondary battery negative electrode materials.

The invention discloses a construction method of a long-service-life pass-through induced drainage pavement. The construction method comprises the following steps: 1, preparing filtering materials of the pass-through water-induced pavement, including coarse aggregate, fine aggregate and modified bituminous mixture according to the weight ratio of 58.5 to 35.85 to 5.65, wherein the modified bituminous mixture comprises slaked lime, red mud and conjugate fiber according to the weight ratio of 58.5 to 35.85 to 5.65, and the conjugate fiber comprises wood fiber and basalt fiber according to the weight ratio of 1 to 2; 2, processing a substrate of the construction pavement; 3, arranging an adhesive layer or sealing layer which has the thickness of 0.1-0.2mm and the porosity of 30%; 4, arranging a substrate filtering material layer which is 0.05-0.15mm thick between a soil layer and a gravel layer of the substrate; 5, mechanically paving; 6, treating joints; and 7, maintaining the pavement. The construction method can obviously improve the adhering force, anti-cracking performance, tensile and water-damage resistance performance and noise reducing performance of the pavement, enhance the rainstorm resistance of the pavement, and reduce the influence of long-term rain storage on stability performance of bituminous concrete.

The present invention relates to a protein silk preparation method and applications of protein silk as a cosmetic additive in the field of cosmetics. According to the present invention, natural polymer materials are adopted as a carrier and a film forming material to wrap natural silk protein hydrolysate-silk peptide to prepare a silk-like product, and the silk-like product is added to various transparent cosmetics so as to increase beautifying effects, wherein the natural polymer materials adopted as the carrier and the film forming material are sodium alginate, gellan gum, carrageenan and locust bean gum, the transparent cosmetics comprise two classes, one class is an essence and gel system adopted carbomer as a suspending agent, the essence and gel system comprises an essence liquid, an essence original liquid, a massage cream, a jelly mask and the like, the other class is a surfactant system adopted SF-1 as a suspending agent, and the surfactant system comprises a transparent facial cleanser, a transparent shower gel, a transparent shampoo and the like.

The invention discloses a form-seal method for food packaging. The method sequentially includes the steps of a bag forming process, a vertical sealing process and a transversal sealing process, wherein the bag forming process includes folding an entire roll of packaging film into square film bags through a bag forming unit, the transversal sealing process includes performing corner inserting and heat-sealing to the front ends of the square fill bags filled with food after being vertically sealed, by a knife-sealing corner-inserting unit, cutting the rear ends of the square film bags in advance, then performing corner inserting and heat-sealing to obtain the finished products. During the transversal sealing process, the vertically sealed square film bags can be successively subjected to end corner inserting and sealing by adopting the knife-sealing corner-inserting unit, and thereby the efficiency of forming and sealing of a whole package is improved and the sealing effect is better.

The invention provides a preparation method of oxidized graphene modified asphalt. The preparation method includes following steps: slowly adding graphite into mixed acid, and well stirring to obtaina mixed material; during stirring, slowly adding potassium permanganate into the mixed material, and continuously stirring for reaction to obtain an oxidized mixed material; slowly adding hydrogen peroxide into the oxidized mixed material, continuously stirring for reaction to obtain an oxidized mixed solution; cooling the oxidized mixed solution to room temperature, performing ultrasonic treatment, and performing centrifugal separating and washing to obtain oxidized graphene mother liquid; adding the oxidized graphene mother liquid into asphalt, heating to fusion, and shearing to obtain the oxidized graphene modified asphalt. The invention further provides the oxidized graphene modified asphalt prepared by the method. The oxidized graphene modified asphalt is a stripped oxidized graphene / asphalt composite material and has excellent high-temperature stability, low-temperature crack resistance and thermo-oxidative aging resistance.

The invention relates to a flooding prevention device for a parking lot. The flooding prevention device comprises an air pump, an air sac, a controller and a first water level sensor. The bottom of the air sac is fixedly arranged on the ground of the parking lot, and the first water level sensor is arranged on the outer side of the air sac and is electrically connected with the controller. When the first water level sensor detects water outside the air sac, the first water level sensor transmits an alarm signal to the controller, the controller controls the air pump to inflate the air sac so that the air sac can uprise, and after the air sac rises, a first closed water wall is formed around a vehicle packed on the parking lot to isolate the vehicle from the water. The flooding prevention device for the parking lot is high in practicality, and can isolate the vehicle from the water by a physical isolation method when in a flood, so that the vehicle is effectively protected from immersing in the flood, and loss is reduced. Besides, by the aid of the air sac serving as an isolation tool, the air sac can be inflated to rise and can wrap the vehicle effectively, so that vehicle paint cannot be damaged while the vehicle can be sufficiently protected.

The invention relates to a dense colloid used in fire hazard treatment in coal layer, wherein it is formed by water, skeleton, and densifier; the skeleton is one of cola ash, loess, sand or stone powder; the densifier is one or several of carboxymethyl cellulose, cellulose ethyl ether, carboxymethyl hydroxyethyl cellulose, cellulose methyl, carboxyethyl cellulose, hydroxypropyl cellulose methyl, butyl cellulose, glycol cellulose, and hydroxypropyl cellulose; when using, mixing the water, densifier, and skeleton to be poured into fire area. The inventive colloid has strong water kept ability, and better adhesive with the coal, to effectively pack high-temperature coal, and improve the fire extinction effect; and the water and skeleton are not easily separated, to prolong the cooperation between them, reduce the evaporate speed of said product in high temperature to avoid explode water gas.

The invention belongs to the field of preparation of negative electrode materials of lithium ion cells, and discloses a high-capacity graphene / silicone composite negative electrode material and a preparation method. The method specifically comprises the following steps: preparing certain graphene oxide solution by a modified Hummer method; preparing tetraethoxysilane as a silicone source; uniformly mixing the silicone source with the graphene oxide and magnesium powder based on certain ratio; ultrasonically dispersing; drying the mixed solution into powder through a spraying drying device; reducing under high temperature in certain atmosphere; washing with diluted acid and distilled water in a plurality of times; drying; and grinding powder with certain fineness. According to the method,tetraethoxysilane is used as the silicone source which is high in compatibility; the reaction time is controllable; and moreover, silicone can be effectively wrapped with graphene, so that the electricity conductivity of the silicone can be improved; and meanwhile, the silicone expansion in charging and discharging process can be avoided. Therefore, the circulating performance and the multiplyingpower of the cell with the silicone negative electrode material can be improved.

The invention discloses a controllable crosslinked bionic tissue adhesive and applications thereof. The adhesive comprises the following components in parts by mass: 75-90 parts of liquid polymer, 0.5-10 parts of reducer, and 9.5-15% of oxidizer-carrying high polymer microspheres. The liquid polymer is prepared by grafting dopamine hydrochloride and methacrylic anhydride at a molar ratio of 1:1 to obtain a monomeric compound, and copolymerizing the monomeric compound and methoxy ethyl acrylate at a molar ratio of 1:1. The bionic tissue adhesive disclosed by the invention has the advantages of high adhesive force in in-vivo liquid environment, good rheological property at initial stage, accurate location by syringe, and complete contact and firm adhesion with adhesive interface, and also has filling and sealing functions and good hemostatic effect. The bionic tissue adhesive is cured to be an elastic solid with enhanced strength after several hours, has good fixing effect to damaged tissue, has firm adhesion, and can better promote healing of damaged tissue.

The invention discloses an extract liquor purification treatment method for paper-making reconstituted tobacco. The method comprises following steps: 1, putting tobacco materials containing tobacco stems, fragments and tobacco waste into an extraction tank employing water as an extraction solvent, performing solid-liquid separation after the extraction so as to obtain the solid and the extract liquor, wherein the solid is used for pulping and paper-making so as to form the paper base; 2, putting functional fibers into a hydro-pulper for pulping, and performing beating after the pulping; 3, sandwiching the beaten functional fibers between two filter screen layers to form a filter cake layer, and enabling the extract liquor to penetrate the filter cake layer; or directly adding the pulped functional fibers into the extract liquor, allowing the extract liquor to stand after the extract liquor is fully stirred, and adding guar gum into the extract liquor so as to make the functional fibers to fully and rapidly flocculate; and 4, purifying the extract liquor sequentially through a mesh screen and a horizontal screw decanter centrifuge, enabling the purified extract liquor to penetrate a condensation device for condensation, dip-coating the concentrated solution on the paper base, and drying and cutting the paper base so as to obtain the tobacco. According to the invention, the clarity degree of the extract liquor is improved by 35.23%, the color is bright, and the taste is improved.

The invention relates to a self-repairing microcapsule, a preparation method and an application thereof. The microcapsule comprises a capsule core and a repairing microcapsule wall on the external surface of the capsule core, the capsule core is a repairing agent, the repairing microcapsule wall is composed of styrene-maleic anhydride and gelatin, wherein, the mass ratio of the repairing agent to styrene-maleic anhydride to gelatin is 5-15:1-2:1-5; the self-repairing microcapsule is prepared by employing a complex coacervation method; and the self-repairing microcapsule is used for repairing the cracks of cement-based materials. Compared with the prior art, the synthetic method is simple, synthetic efficiency is high, adverse impact of the noxious material and the additionally added emulsifier during a synthesis process can be better solved, the self-repairing microcapsule has environmental protection, and can be widely used for repairing the cracks of cement-based materials.

The purpose of the invention is to provide a Pudilan children's antiviral oral pellet gel and a preparation method thereof. The preparation method comprises the following steps: adopting a gel matrix, extracting Radix Scutellariae, Herba Taraxaci, Corydalis bungeana Turcz. and isatis root, preparing pellets by using extracted effective components, and uniformly dispersing the pellets in a gel. The prepared gel can be a solid gel, a semisolid gel or a xerogel. The method effectively covers the bad smell of medicines, solves the mouthfeel problem of the medicines, and allows the sweet oral pellet gel loved by children to be prepared, and the sweet and smooth mouthfeel of the oral pellet gel makes children easily take the medicine. Traditional Chinese medicines are combined with the gel dosage form to improve the children's administration long-term single dosage form, and the oral pellet gel has the efficacies of heat clearing, detoxification, antibiosis and inflammation prevention, and also has the advantages of high content of the effective component, small administrating dosage, stable preparation and good curative effect.

The invention discloses a novel coal ash grouting material, which is composed of specific components by mass: 1 part of coal ash, 2 parts of water, liquid water glass occupying 5% to 10% of the coal ash and sepiolite occupying 2%. to 5%.of the coal ash. Improved coal ash grout has strong adhesion performance on firing articles, can evenly and effectively cover the surfaces of the firing articles, is strong in water-retaining performance and good in fire resistance, can effectively block leakage insulate oxygen to prevent grout from losing, and is low in price, environmental-friendly, good in stability and suitable for pipeline transportation.

The invention relates to the field of wafer level chip package, and relates to a wafer level package method for reducing edge stress. The method comprises the following steps of 1, providing a wafer with a functional region and a bonding pad; 2, providing a cover plate, wherein the cover plate is bonded with a support wall; 3, bonding the cover plate with the support wall with the wafer by a bonding adhesive; 4, pre-cutting the position of a cutting channel on a second surface of the wafer, and cutting and removing a certain thickness of the support wall to form a first groove body; 5, etching the second surface of the wafer, removing a material on the bonding pad to form a second groove body; 6, making a redistribution layer, in which the redistribution layer is made on the second surface of the wafer; and 7, cutting the wafer along the cutting channel to form package of a single chip. By wrapping and protecting the edge of the cutting channel, a metal layer and a dielectric layer, the risk that a part of the chip edge is layered and cracked is reduced, and electrical connection between the bonding pad and a metal line is improved.

The invention discloses a barrier device with a function of easily adjusting the size for engineering blasting. The barrier device comprises fixing rods, barrier plates and a base, wherein the fixingrods are uniformly installed on the top of the base, supporting corner brackets are installed at the positions where the bottoms of the fixing rods are connected with the base respectively, fixing sleeves are arranged on the fixing rods respectively, and the barrier plates are arranged on one sides of the fixing sleeves respectively. Fixing bases are uniformly installed on one sides of the barrierplates respectively, the fixing bases are fixedly connected with the fixing sleeves, and shock-absorption plates are arranged on the sides, away from the fixing bases, of the barrier plates respectively. According to the barrier device with the function of easily adjusting the size for engineering blasting, by arranging water-penetration membranes and water-absorption sponge, when stones spattered in the blasting process squeeze the shock-absorption plates and the barrier plates, water absorbed in the water-absorption sponge easily seeps out of the water-penetration membranes after being squeezed and overflows through water outlets, dust generated during blasting is effectively wrapped, less dust rises, and therefore, the pollution of the dust to the environment is reduced.

An adjustable jetting support for dust control of a comprehensive mechanized excavation surface of a mine comprises a support plate and a plurality of connecting lugs. A plurality of input port through holes are disposed in the middle of the support plate at intervals, delivery pipes penetrate through the input port through holes, strip-shaped holes are disposed on two sides of each input port through hole, an elongated bolt is arranged in each strip-shaped hole, a sprayer mounting branch pipe connected with a corresponding input pipe is disposed at the front of each input port through hole of the support plate, branch pipe fixing lugs are arranged on the upper side and the lower side of each sprayer mounting branch pipe and are respectively sleeved on the corresponding elongated bolts, each elongated bolt is provided with an adjusting nut used for fixing and adjusting the distance from the corresponding sprayer mounting branch pipe to the support plate, and a plurality of sprayers are disposed on the sprayer mounting branch pipes. The adjustable jetting support is applicable to treating high-concentration dust by the aid of dust falling media such as water mist, foam and the like when an underground coal mine comprehensive mechanized heading machine cuts and crushes coal rocks, dust falling efficiency and utilization rate of the dust falling media are increased, and the adjustable jetting support is simple in structure, simple and convenient in operation and easy to repair and replace.

The invention provides a self-repairing adhesive tape for a tire. The self-repairing adhesive tape comprises four layers from outside to inside, namely an anti-penetration layer A, an elastic layer B,a pressure-resistant layer C and a protective layer D, wherein the layer A is composed of a thermoplastic elastomer, a softener, an antioxidant and an anti-ultraviolet agent 770; the layer B is prepared from polyamide resin, polyether ester fibers, a filler, a coupling agent, an antioxidant and rubber; the layer C comprises rubber, a thermoplastic elastomer, resin, a softener, a filler and an antioxidant; and the layer D is release paper or a PE film. The preparation process of the self-repairing adhesive tape for the tire is environmentally friendly; and the self-repairing adhesive tape forthe tire has good elongation at break, rebound resilience and low air permeability, so the tire has a good protection and self-healing function on a harsh road surface.

The invention discloses a novel winter plant protection system and a use method thereof. According to the technical scheme, the novel winter plant protection system is characterized by sequentially comprising a plastic protection layer, a thermal insulation layer, a pesticide storage layer and a bonding layer from outside to inside, wherein the pesticide storage layer comprises at least two layers of fabric, a solid pesticide is distributed between adjacent pieces of fabric, a plurality of fixing pieces are distributed on the pesticide storage layer, the solid pesticide is a fumigant solid insecticide, accordingly, the fumigant solid insecticide can effectively give out pesticide after being attached, the insect killing and dispelling effects are performed effectively, and the insect control effect of trunks is effectively improved. With the adoption of the solid pesticide, no vast water is produced during storage and use, pesticide effect loss is effectively avoided, dryness of the thermal insulation layer and the pesticide storage layer is effectively kept, the condition that the thermal insulation layer and the pesticide storage layer freeze due to outside low temperatures is avoided, and the thermal insulation effect is effectively improved.

The invention provides a sewage treatment material which comprises 10-20 parts of bamboo charcoal, 5-10 parts of porous starch, 1-5 parts of carboxymethylcellulose, 10-20 parts of polyvinyl alcohol, 1-5 parts of hydrotalcite, 1-5 parts of amino resin and 1-5 parts of kieselguhr. Compared with the prior art, a preparation method of the material is simple in process; the obtained sewage treatment material is free from environmental pollution, can be effectively applied to sewage treatment for public places such as ponds and swimming pools, has the characteristics of high adsorption capacity, high selectivity and low cost, and has market application prospect.

The invention relates to a strengthening method of poly-belt-hydroxy butyrate to larva of artemia. The strengthening method is characterized in that: when the larva of the artemia is strengthened by the poly-belt-hydroxy butyrate, the concentration of the poly-belt-hydroxy butyrate is 100mg / L, the strengthening time is 24h, and the grain size of the poly-belt-hydroxy butyrate is 10-50 mu m. The poly-belt-hydroxy butyrate (PHB) is the biological control agent which is wide in application prospect and can replace the antibiotic, and the research of the application of the poly-belt-hydroxy butyrate in the aquiculture is under the infancy stage at home currently and firstly. The strengthening method shows the influence of the PHB with different concentrations and the different strengthening and cultivating times to the survival rate and the growth of the larva, and is best in the strengthening effect to the larva of the artemia by 100mg / L PHB within 24 hours, so that the strengthening method has a good guide meaning for researching the application of the PHB in aquatically seedling.

The invention discloses a strong-stability lactic acid detection reagent, belonging to the technical field of clinical in-vitro detection. The strong-stability lactic acid detection reagent comprises two components, namely a reagent R1 and a reagent R2; substances in the reagent R1 and the reagent R2 are reasonably matched in use, so that the whole reagent system is in a stable state. Compared with a conventional lactic acid detection reagent, the strong-stability lactic acid detection reagent has a relatively excellent stability effect and is beneficial to the clinical popularization and use.

The invention relates to a metformin hydrochloride sustained-release tablet and a preparation method thereof, and belongs to the technical field of medicine. The metformin hydrochloride sustained-release tablet is composed of sustained-release granules, sustained-release microcapsules and a lubricant, and is prepared through tabletting, wherein the weight ratio of the metformin hydrochloride in the sustained-release granules and the metformin hydrochloride in the sustained-release microcapsules is (3:7)-(6:4), and the lubricant is selected from superfine silica powder or magnesium stearate. According to the preparation method, a traditional spray drying method is improved, by combining a dry granulation process, the sustained-release microcapsules and sustained-release granules of different processes are prepared, tabletting is further carried out to prepare the metformin hydrochloride sustained-release tablet, the specific ratio of the sustained-release microcapsules prepared by the spray drying process to the sustained-release granules prepared by the dry granulation process is explored, and the metformin hydrochloride sustained-release tablet of which the inner portion has the structure of the sustained-release microcapsules and the sustained-release granules is finally obtained. The metformin hydrochloride sustained-release tablet and the preparation method thereof achievea good release behavior of the sustained-release tablet, overcome the shortcomings of sudden release and incomplete release, obtain a better release curve, and also greatly reduce the impurity content.