38results about How to "Reduce cladding" patented technology

The invention overcomes the technological difficulty that a single solvent is different to prepare a spherical crystal. The single solvent 2-butanol is adopted, and the amount and grain diameters of added clopidogrel hydrogen sulfate I crystal form spherical crystal are controlled, so that clopidogrel hydrogen sulfate is stably separated out from a solution system in a spherical crystal form in a specific powder form range, the obtained clopidogrel hydrogen sulfate spherical crystal has the characteristics of specific powder and has superior state in the aspects of solvent residue, bulk density and mobility, and the preparation method is beneficial for the realization of powder vertical compression preparation technology. The invention also further discloses a medicine composition containing the clopidogrel hydrogen sulfate I crystal form spherical crystal prepared and obtained through the technology.

The invention provides a recycling method of mother liquor purifying, refining and crystallizing mother liquor of dodecanedioic acid, and belongs to the separation treatment method of non-acyclic dicarboxylic acid containing 12 carbon atoms. The recycling method comprises the steps of (1) recovering a solvent which is methanol; (2) distilling to dissolve and dilute materials residual at the bottom of a kettle; (3) performing acidification under a high temperature, and crystallizing; (4) drying. The recycling method of mother liquor purifying, refining and crystallizing mother liquor of dodecanedioic acid has the advantages that the recovered dodecanedioic acid product has a good color and luster and is of high purity, and moreover, the recovery yield is raised, the device investment is saved, the operation is simple and convenient, the resource can be saved, and the environment is protected; the recovery yield of the dodecanedioic acid product is not less than 97.0%; the product quality meets the technical indexes that the total acid is not less than 99.7wt% (percentage by weight), single acid is not less than 99.3wt%, ash content is not greater than 0.003wt%, the total nitrogen is not greater than 0.004wt%, ferric oxide is not greater than 0.0002wt%, and water content is not greater than 0.17wt%.

The invention discloses a recycling method of long carbon chain binary acid purification and refining crystallization mother liquor, and belongs to a separation treatment method of acyclic dicarboxylic acid with 12 carbon atoms. The method comprises the following operation steps: (1) recovering solvent methanol; (2) dissolving and diluting a residual material at the bottom of a distillation kettle; (3) performing high-temperature acid-out crystallization; (4) drying. The recycling method of the long carbon chain binary acid purification and refining crystallization mother liquor has the advantages that the recovered long carbon chain binary acid product has good color, high purification and high recovery yield, equipment investment is saved, the operation is easy and convenient, the resource is saved, and environment protection is facilitated. By using the method, the long carbon chain binary acid recovery rate is greater than or equal to 97.0 percent. The product quality reaches the following technical indexes that the total acid is greater than or equal to 99.7 percent by weight, the single acid is greater than or equal to 99.3 percent by weight, the ash content is smaller than or equal to 0.003 percent by weight, the total nitrogen is smaller than or equal to 0.004 percent by weight, the ferric oxide is smaller than or equal to 0.0002 percent by weight, and the moisture is smaller than or equal to 0.17 percent by weight.

The invention provides a novel method for preparing an I crystal form of spherical clopidogrel hydrogen sulfate. The method comprises the following steps: using single 2-butanol as a solvent, controlling the concentration, the adding mode and the adding speed of a sulphuric acid for forming salt, shortening processing time, meanwhile separating the globular clopidogrel hydrogen sulfate stably out of a solution system. The obtained clopidogrel hydrogen sulfate conforms to the needs of a subsequent preparation technology in the respects of solvent residue, bulk density, fluidity and the like.

The invention relates to the technical field of lithium ion batteries, in particular to a coating technology of lithium cobalt oxide. The coating technology of the lithium cobalt oxide includes the following steps of weighting out a certain amount of lithium cobalt oxide, measuring metal ionic compounds and water-solubility organics based on the molar weight of the lithium cobalt oxide according to ratios that the total molar weight of the metal ionic compounds is 0.5%-2% of the molar weight of the lithium cobalt oxide and the total molar weight of the water-solubility organics is 50%-70% of the molar weight of the lithium cobalt oxide, adding water to the metal ionic compounds and the water-solubility organics, conducting ball-milling to obtain primary slurry, adding the lithium cobalt oxide and water to the primary slurry, conducting the ball-milling to obtain secondary slurry, drying the secondary slurry, roasting the secondary slurry, and obtaining coated lithium cobalt oxide materials. The coating technology of the lithium cobalt oxide is simple in technology process, low in cost, appropriate for industrialization large batch production, and capable of effectively avoiding the phenomenon that metallic elements generate segregation in the high-temperature process. In addition, the lithium cobalt oxide obtained through the coating technology is even in particle, less in agglomeration, good in electrochemical performance, and high in stability in charge-discharge processes.

The invention discloses a method for preparing flower-sphere-shaped light calcium carbonate by using ultra-fine ground heavy calcium carbonate as a seed crystal. The method comprises the following steps: adding the ultra-fine ground heavy calcium carbonate used as the seed crystal into calcium hydroxide concentrate slurry, performing mixing, introducing carbon dioxide, and performing a carbonization reaction to obtain the flower-sphere-shaped light calcium carbonate, wherein an addition amount of the ultra-fine ground heavy calcium carbonate is 0.5-2% of a mass of the flower-sphere-shaped light calcium carbonate. According to the method provided by the invention, the flower-sphere-shaped light calcium carbonate prepared by the method is grown and arranged in a radioactive spherical shape by using the ultra-fine ground heavy calcium carbonate seed crystal as a core, the structure makes the flower-sphere-shaped light calcium carbonate have high light scattering ability, and paper whiteness and opacity can be significantly improved; and in addition, due to the induction action of the seed crystal, the efficiency of carbonization is improved, covering of un-reacted calcium hydroxide isreduced, so that the flower-sphere-shaped light calcium carbonate has extremely-narrow particle size distribution, and the spherical particles give good rheological properties to the slurry.

The invention relates to a coaxial nanometer wire with a porous graphene / MnO2 pipe and a middle line structure, a preparation method of the coaxial nanometer wire and an application of the coaxial nanometer wire. The material can be regarded as a positive-electrode active material of an electrochemical super-capacitor. The material is formed by cladding a MnO2 nanometer wire with a porous graphene pipe, the length is 10-40 micrometers and the diameter is 40-160 micrometers, wherein the diameter of the MnO2 nanometer wire is 30-80 micrometers, and the porous graphene pipe is formed by curling a graphene sheet and provided with different-extent mesoporous structures. The coaxial nanometer wire is relatively high in specific capacity, and excellent in cyclic performance and steadiness and electrochemical performance under high current charge-discharge conditions; secondly, the coaxial nanometer wire is simple in process, after simple hydro-thermal treatment is performed, the coaxial nanometer wire material with the middle line structure and the porous graphene / MnO2 pipe is low in power consumption. The mass of the used graphene only accounts for 2.2% of the total mass, thus the coaxial nanometer wire material is good for marketization and popularization.

The invention discloses high-strength whitening glaze slurry for ceramic and a preparation method of the high-strength whitening glaze slurry. The glaze slurry is prepared from raw materials and water through mixing and ball milling; the raw materials comprise, in parts by weight, 16-22 parts of potash feldspar, 15-19 parts of calcite, 16-20 parts of quartz, 10-14 parts of frit, 1-5 parts of sodium carbonate, 10-14 parts of calcium carbonate, 0.5-2.5 parts of dolomite, 4-6 parts of a whitening agent and 0.5-2.5 parts of a reinforcing agent, wherein the whitening agent is prepared from 50-70 parts of kaoline, 50-70 parts of titanium dioxide, 1-2 parts of calcium stearate and 2-4 parts of gamma-chloropropyltrimethoxysilane; the reinforcing agent is prepared from, in parts by weight, 10-14 parts of hydroxyapatite, 10-20 parts of calcined talc and 0.2-0.4 parts of an aluminum zirconium coupling agent. The high-strength whitening glaze slurry for the ceramic adopts reasonable materials, a preparation method is simple, the production cost is low, the performance is good, and the high-strength whitening glaze slurry is worth popularization and application.

The invention provides a low-floating-fiber high-flame-retardancy PBT (polybutylene terephthalate) material which is characterized by comprising the following raw materials in parts by weight: 40-60 parts of PBT resin, 10-20 parts of flame retardant A, 5-10 parts of flame retardant B, 0.1-0.3 part of flame retardant C, 20-30 parts of glass fiber, 3-10 parts of toughener, 0.1-0.3 part of coupling agent, 0.5-1 part of anti-glass fiber exposure agent, 0.2-0.5 part of lubricant and 0.1-0.5 part of antioxidant. The invention also provides a preparation method of the low-floating-fiber high-flame-retardancy PBT material. The low-floating-fiber high-flame-retardancy PBT material has the characteristics of low floating fibers, high flame retardancy and no halogenation. In addition, the low-floating-fiber high-flame-retardancy PBT material has the advantages of lower cost and higher cost performance. The production technique is simple in process and easy to implement, can not cause environmental pollution, and has low hazards to human health.

The purpose of the present invention is to disclose Using straw as raw material to prepare cellulose, 1. Pretreatment of straw 2. Alkalinization of cellulose 3. Etherification of alkali cellulose. This invention can use straw instead of refined cotton to prepare cellulose ether, which will greatly reduce production costs and increase the added value of straw , To find a new way for farmers to generate income.

The invention discloses a composite catalyst and a method for preparing the same, and relates to the technical field of catalysts. By the aid of the composite catalyst and the method, the problem of low C2+OH selectivity in procedures for preparing low-carbon mixed alcohol from coal-based synthesis gas can be solved. The composite catalyst comprises, by weight, 8-16 parts of copper, 5-10 parts ofiron, 0.1-1 part of rhodium, 1-11 parts of auxiliaries and 62-85 parts of carriers. The composite catalyst and the method have the advantage that the composite catalyst can be applied to processes forpreparing low-carbon mixed alcohol from coal-based synthesis gas.

The invention provides a method for preparing a direct liquid fuel cell membrane electrode. The method comprises the following steps: mixing a Nafion solution, an alcohols solvent and water with a catalyst, then spraying the mixture onto a transfer membrane to form a catalyst layer, transferring onto a Nafion membrane so as to finally obtain the membrane electrode. The volume VNafion of the Nafion solution meets the formula as follows: VNafion=pl*m carrying capacity*S / (p2*Omega *p3*a). Compared with the prior art, the method is characterized in that a certain proportion between volumes of catalyst particles and Nafion particles is analyzed from microscopic view according to the carrying capacity of the catalyst of unit area of the membrane electrode, so that the volume of the Nafion solution meets the specified condition, the coating of the Nafion solution to the catalyst is reduced, the utilization rate of the catalyst in the catalyst layer is increased, and the electrochemical performance of a cell is improved. In addition, the catalyst layer is transferred onto the Nafion membrane with a transfer method, so that the combinability of the catalyst layer and the Nafion membrane can be improved, and therefore the resistance of the cell is reduced.

The invention discloses a resveratrol microsphere and a preparation method thereof, and belongs to the technical field of organic micro-nano materials. The resveratrol microsphere and the preparationmethod thereof aim to solve the problem that resveratrol has less solubility in water, poor light stability, poor oral absorption, low bioavailability, and difficulty in long-lasting action. The resveratrol microsphere is prepared with bovine serum albumin, resveratrol, vegetable oil, an emulsifier and distilled water as raw materials, the encapsulation rate of the obtained microsphere is up to 78%, and the drug loading amount of the microsphere is up to 81%. After 10 hours of UV irradiation treatment, the retention rate of pure resveratrol is only about 20% while the retention rate of resveratrol in protein microspheres is 50% or above, and the photostability is improved. Meanwhile, the preparation process is simple, easy to implement, and suitable for being applied and popularized.

The invention relates to the field of disposable sanitary articles, in particular to a preparation method of a novel leakage-proof pant-type paper diaper. The method mainly solves the problem of poorcomfort of leakage-proof pant-type paper diapers in the prior art. The method comprises the following steps: 1) preparing a liquid-permeable surface layer; 2) preparing an absorption core layer; 3) preparing a liquid-impermeable bottom layer; 4) sequentially compounding and connecting the liquid-permeable surface layer, the absorption core layer and the liquid-impermeable bottom layer; 5) preparing a clothing layer; 6) cutting a product in the step 4) into single absorption bodies; 7) folding the bottom non-woven fabric at the front waist region and the back waist region upwards along the boundary of adjacent blank region and rubber band region at the middle part of the non-woven fabric; 8) cutting trouser legs on the product in the step 7) and between two adjacent absorption bodies; 9) folding the product in step 8) along the central axis in the transverse direction, and welding the product in the transverse direction at the trouser legs; and 10) cutting the product in the step 9) along the middle part of the welding part of the product.

The invention relates to a purification method of dodecanedioic acid, belonging to purification treatment of cycle-free dicarboxylic acid with 12 carbon atoms. The method is characterized by comprising the following steps: by using a dodecanedioic acid crude product produced by microbial fermentation as an initial raw material and water as a dissolving solvent, carrying out alkali fusion at 100-102 DEG C under the condition of pH value of 6.0-6.2 to prepare a dodecanedioic acid crude product water solution; and after carrying out adsorption-oxidation dual decolorization, acidifying at 98-102 DEG C to crystallize, and finally, drying to obtain the scale-like high-purity dodecanedioic acid crystal product. The purification method of dodecanedioic acid has the advantages of favorable product color, high product purity, high refinement yield, equipment investment saving and resource saving, and is simple to operate and beneficial to environmental protection. The purification yield of the dodecanedioic acid is greater than or equal to 98.4%. The dodecanedioic acid is suitable to be used as a polycondensation monomer to perform polycondensation reaction with diamine to synthesize the long-carbon-chain nylon, and is also suitable to be used as a raw material of synthetic perfume and drugs.

The invention discloses a preparation technology for watermelon juice capable of improving immunity. The preparation technology comprises the steps of 1 pre-treatment, wherein seedless watermelons areselected, peeled and frozen, and after the watermelons are cut into pieces and frozen, the frozen watermelon pieces are placed in an additive solution containing mango peel extracts and aloe extractsand taken out for unfreezing; 2 juicing, wherein saccharose is sprayed to the surfaces of the thoroughly unfrozen watermelon pieces for preserving, then the preserved watermelon pieces are juiced, and filter residues and filter liquor A are obtained after vacuum extraction filtration; the filter residues and watermelon peels are mixed, smashed and subjected to ultrasonic dispersion, and after juicing and extraction filtration, filter liquor B is obtained; 3 compounding, wherein the filter liquor A is mixed with the filter liquor B, and then after ultrafiltration, sterilization and metal and microbiological detection, the watermelon juice capable of improving the immunity is obtained. The preparation technology has the advantages that the preparation technology is simple, not only are allthe effects of the watermelons utilized, but also the additional value and economic value of the watermelons are improved, and the watermelons have excellent health care effects of blood fat reductionand weight losing, can maintain dynamic balance of the organism oxidation and antioxidant system, remove redundant free radicals, and improve the organism phylactic power and immunity.

A door handle grinding and polishing clamp with an anti-winding function for a robot comprises a robot fifth shaft fixing mechanism, an infinite rotating mechanism, a door handle clamp and a door handle workpiece; the infinite rotating mechanism and the robot fifth shaft fixing mechanism are connected in a matched mode; the door handle clamp and the infinite rotating mechanism are connected in a matched mode; the door handle clamp at least comprises a robot connection flange, a tensioning air cylinder, a tensioning center and a tensioning clamping piece; the robot connection flange and the infinite rotating mechanism are connected in a matched mode; the tensioning air cylinder is arranged on the robot connection flange and is in driving connection with the tensioning center; the tensioningcenter drives the tensioning clamping piece to clamp or loosen the door handle workpiece through the tensioning air cylinder; the infinite rotating mechanism at least comprises a rotating air distribution shaft and a fixed shell; the rotating air distribution shaft is rotationally inserted in the fixed shell, an air guiding block is arranged on the lower portion of the rotating air distribution shaft, and the air guiding block is connected with the tensioning air cylinder in a matched mode; and the rotating air distribution shaft, the air guiding block and the tensioning air cylinder rotate freely relative to the fixed shell. Practicability is high.

The invention belongs to the technical field of slurry homogenizing equipment, and particularly relates to production equipment, a mixed precipitate prepared by using the equipment and a method and application of the mixed precipitate, and the production equipment comprises liquid mixing equipment which is used for mixing raw material components to obtain mixed liquid; the ultrasonic dispersion equipment is used for carrying out ultrasonic dispersion on the mixed solution to obtain a first treatment solution; the homogenizing equipment is used for homogenizing the first treatment liquid to obtain second treatment liquid; the storage equipment is used for carrying out standing treatment on the second treatment liquid to obtain generated liquid; wherein the liquid mixing equipment comprises a venturi tube, a first liquid storage tank communicated with the inlet end of the venturi tube and a second liquid storage tank communicated with the throat of the venturi tube, and the outlet end of the venturi tube is communicated with the ultrasonic dispersion equipment.

A method for a hot press forming apparatus and a hot press forming apparatus (102; 202) for forming a blank (104), the hot press forming apparatus (102; 202) comprising a first die (106; 206) and a second die (108), wherein the first die (106; 206) has at least one die cavity (110; 210), and the second die (108) has at least one die protrusion (112), wherein the hot press forming apparatus (102; 202) is configured to, by means of the first and second dies (106, 108; 206, 108), press form the blank (104) placed between the first and second dies (106, 108; 206, 108). At least one of the first and second dies (106, 108; 206, 108) has a draw radius (116; 216), wherein a member (118; 218) is attached to a die (106; 206) which has a draw radius (116; 216). At least a portion (119; 219) of the member (118; 218) is positioned adjacent to or on the draw radius (116; 216). The member (118; 218) defines a first press forming surface (120; 220), and the die (106; 206) holding the member (118; 218) defines a second press forming surface (122; 222) outside the first press forming surface (120; 220). The member (118; 218) and the die (106; 206), which holds the member (118; 218), are configured such that during the same hot press forming, a first friction arises between the blank (104) and the first press forming surface (120; 220) when the blank (104) is in contact with the member (118; 218) and a second friction arises between the blank (104) and the second press forming surface (122; 222) when the blank (104) is in contact with the die (106; 206) which holds the member (118; 218), the first friction being lower than the second friction.

The invention discloses a method for purifying and refining brassylic acid, and belongs to purification treatment of loop-free dicarboxylic acid with 13 carbon atoms. The method is characterized by comprising the following steps: with a brassylic acid crude product produced by a microbiological fermentation method as an initial raw material, and water as a dissolving solvent, carrying out alkali dissolution at 100-102 DEG C under the condition that the pH value is 6.0-6.2, so as to prepare a brassylic acid crude product water solution; after double decoloration of adsorption and oxidation, carrying out acid precipitation and crystallization at 98-102 DEG C; and finally preparing a cataphracted high-purity brassylic acid product. The method for purifying and refining the brassylic acid disclosed by the invention is good in color and luster, high in purity, high in refining yield, low in equipment investment, and simple and convenient to operate; resources are saved; environmental protection is facilitated; the purifying yield of the brassylic acid is greater than or equal to 98.4%; and the brassylic acid is suitable for condensation polymerization together with diamine as a polycondensation monomer, so as to synthesize long carbon chain nylon, and also is suitable for raw materials of synthesizing spices and medicines.

The invention relates to the technical field of analysis and measurement and especially relates to a measuring method of silicon in a lithium ion battery silicon / carbon anode material through flame atomic absorption spectrometry. The method particularly includes the steps of: carbonizing and ashing the silicon / carbon anode material, adding proper amounts of concentrated nitric acid, an ammonium fluoride water solution and a Triton-100 solution, and performing ultrasonic heating; cooling and filtering the liquid, adding proper amounts of a cesium chloride solution, a strontium chloride solution and the Triton-100 solution to a filtrate, and diluting the filtrate to constant volume by deionized water; and performing measurement through the flame atomic absorption spectrometry. The cesium chloride solution can inhibit high-temperature ionization of silicon, the strontium chloride solution can inhibit interference on silicon due to metal aluminum and phosphates during the measurement and analysis, and the Triton-100 solution can prolong the retention time of ground state atoms in the flame. The flame atomic absorption spectrometry has good selectivity, low spectral line interference, high analysis speed, simple operations, high accuracy and low application cost, so that the measuring method is suitable for the measurement of the content of silicon in the silicon / carbon anode material.

The invention provides a recycling method of mother liquor purifying, refining and crystallizing mother liquor of dodecanedioic acid, and belongs to the separation treatment method of non-acyclic dicarboxylic acid containing 12 carbon atoms. The recycling method comprises the steps of (1) recovering a solvent which is methanol; (2) distilling to dissolve and dilute materials residual at the bottom of a kettle; (3) performing acidification under a high temperature, and crystallizing; (4) drying. The recycling method of mother liquor purifying, refining and crystallizing mother liquor of dodecanedioic acid has the advantages that the recovered dodecanedioic acid product has a good color and luster and is of high purity, and moreover, the recovery yield is raised, the device investment is saved, the operation is simple and convenient, the resource can be saved, and the environment is protected; the recovery yield of the dodecanedioic acid product is not less than 97.0%; the product quality meets the technical indexes that the total acid is not less than 99.7wt% (percentage by weight), single acid is not less than 99.3wt%, ash content is not greater than 0.003wt%, the total nitrogen is not greater than 0.004wt%, ferric oxide is not greater than 0.0002wt%, and water content is not greater than 0.17wt%.

The invention belongs to the technical field of pesticide synthesis, and in particular relates to a crystallization method of iprodione. In the crystallization method of iprodione provided by the present invention, the organic phase in which iprodione is dissolved is removed from the organic solvent under negative pressure. Reflux in the solvent system to dissolve the clear, and then remove the weak acid aqueous solution and residual organic solvents, avoiding the problem of heterogeneous nucleation of iprodione in the crystallization process, reducing the coating amount of impurities inside the crystal, and improving the purity; Crystal form, high crystal packing density, which improves the stability of the product; avoids the use of conventional n-hexane, and improves the operating environment.

The invention relates to the technical field of lithium ion batteries, in particular to a coating technology of lithium cobalt oxide. The coating technology of the lithium cobalt oxide includes the following steps of weighting out a certain amount of lithium cobalt oxide, measuring metal ionic compounds and water-solubility organics based on the molar weight of the lithium cobalt oxide according to ratios that the total molar weight of the metal ionic compounds is 0.5%-2% of the molar weight of the lithium cobalt oxide and the total molar weight of the water-solubility organics is 50%-70% of the molar weight of the lithium cobalt oxide, adding water to the metal ionic compounds and the water-solubility organics, conducting ball-milling to obtain primary slurry, adding the lithium cobalt oxide and water to the primary slurry, conducting the ball-milling to obtain secondary slurry, drying the secondary slurry, roasting the secondary slurry, and obtaining coated lithium cobalt oxide materials. The coating technology of the lithium cobalt oxide is simple in technology process, low in cost, appropriate for industrialization large batch production, and capable of effectively avoiding the phenomenon that metallic elements generate segregation in the high-temperature process. In addition, the lithium cobalt oxide obtained through the coating technology is even in particle, less in agglomeration, good in electrochemical performance, and high in stability in charge-discharge processes.

The invention provides a composite carrier-type catalyst for producing low-carbon alcohols from syngas and a preparation method thereof. The catalyst is composed of a composition of copper, cobalt and rhodium and a composite carrier; wherein, the composition contains a copper-rhodium interface At least one of structure, cobalt-rhodium interface structure and copper-rhodium-cobalt interface structure, the composite carrier is a dual-channel structure composed of carbon nanotubes and silicon dioxide coated on its surface; copper element: cobalt element: The mass ratio of rhodium element=15~20:6~10:1; the mass ratio of copper:composite carrier=1:3~6. Introduce rhodium in the copper-cobalt catalytic system of the present invention, can synergistically catalyze, improve total alcohol selectivity and C 2 + Alcohol selectivity; by loading the copper-cobalt-rhodium composition on the dual-hole composite carrier of silica-carbon nanotubes, it is beneficial to improve the dispersion of the active components of the catalyst and facilitate the diffusion of reactant molecules in the pores, Thereby further improving the total alcohol selectivity and C 2 + Alcohol selectivity.

The invention relates to a large-particle-size lignin / butadiene styrene rubber composite particle and a synthetic method thereof, and the synthetic method specifically comprises the following steps: mixing lignin, epichlorohydrin, an organic solvent and alkali for reaction to obtain modified lignin; mixing with water, and adding styrene butadiene rubber latex for reaction to obtain a mixed solution; and adding the mixed solution and the inorganic acid solution into the electrolyte solution to react, separating out solid composite particles, filtering, washing and drying to obtain the product. According to the method disclosed by the invention, when the large-particle-size composite particles are prepared, the synthesized composite particles are used for preparing lignin-based styrene-butadiene rubber by mixing, and have good comprehensive use performance.

The invention relates to a coaxial nanometer wire with a porous graphene / MnO2 pipe and a middle line structure, a preparation method of the coaxial nanometer wire and an application of the coaxial nanometer wire. The material can be regarded as a positive-electrode active material of an electrochemical super-capacitor. The material is formed by cladding a MnO2 nanometer wire with a porous graphene pipe, the length is 10-40 micrometers and the diameter is 40-160 micrometers, wherein the diameter of the MnO2 nanometer wire is 30-80 micrometers, and the porous graphene pipe is formed by curling a graphene sheet and provided with different-extent mesoporous structures. The coaxial nanometer wire is relatively high in specific capacity, and excellent in cyclic performance and steadiness and electrochemical performance under high current charge-discharge conditions; secondly, the coaxial nanometer wire is simple in process, after simple hydro-thermal treatment is performed, the coaxial nanometer wire material with the middle line structure and the porous graphene / MnO2 pipe is low in power consumption. The mass of the used graphene only accounts for 2.2% of the total mass, thus the coaxial nanometer wire material is good for marketization and popularization.