124results about How to "Reduce the chance of oxidation" patented technology

The invention provides a preparation method for a Fe-N-C oxygen reduction (ORR) catalyst with a special structure. In a Fe-N-C composite structure, C is used as an ORR catalytic base material which mainly exists in the form of graphitized nanosheets and nanotubes; N is doped into a graphite C network framework to replace a part of C so as to strengthen the catalytic capability of the base active center; and Fe-based nanoparticles are wrapped in the C nanotubes and nanosheets to maintain the catalytic activity of the graphite C. The Fe-N-C catalyst obtained in the invention not only has high ORR catalytic activity buts also shows extremely high stability; and the adopted preparation method is simple, the equipment requirement is low, the product performance is good, and commercial popularization and application can be realized favorably.

The invention relates to a method for preparing a thermoelectric material, in particular to a method for preparing a bismuth telluride-based thermoelectric material. The method is characterized by comprising the following steps of: 1) preparing bismuth telluride-based thermoelectric material ingots by a zone-melting method; and 2) directly loading the prepared bismuth telluride-based thermoelectric material ingots into an extrusion die, putting the bismuth telluride-based thermoelectric material ingots and the extrusion die together into a hot extrusion furnace and performing hot extrusion in vacuum or under the protection of inert gas to obtain the bismuth telluride-based thermoelectric material, wherein the hot extrusion conditions are that: the hot extrusion temperature is between 250 and 550 DEG C, the heating rate is 10 DEG C/min, the heat preservation time is 1 to 3 hours, the extrusion ratio is 9:1-3:1, the extrusion angle is 30 to 60 degrees and the extrusion speed is 1mm/min. The method saves cost and can shorten the production period; and the bismuth telluride-based thermoelectric material prepared by the method has the characteristics of high breaking strength and compression strength.

The invention discloses a method and a device using laser to induce double cavitations. The method and the device using the laser to induce the double cavitations have the advantages that when liquid medium is radiated by a laser beam, the cavitations are simultaneously produced on the laser focusing part and the surface of to-be-processed material, so that the cavitation inducing strong shock wave in the liquid medium and the strong shock wave produced by the cavitation inducing at the surface of the to-be-processed material are overlapped, repeated, or simultaneously acted on the surface of the to-be-processed material; the surface intensity of the material is improved; the impact pressure is high, the oxidizing degree of material is low, and the like; the application prospect is wide.

The invention provides mercapto polyaniline and a preparation method thereof, and belongs to the field of polyaniline preparation methods. The problem that a mercapto group is oxidized by an oxidant in the process of a conventional preparation method for the mercapto polyaniline is solved. The method comprises the following steps of dissolving mercapto aniline monomers into an organic solvent to obtain a first mixed solution; dissolving the oxidant into an aqueous solution of an inorganic acid to obtain a second mixed solution; mixing the first and second mixed solutions, and polymerizing the mercapto aniline monomers on a water-organic solvent interface to obtain a reaction product; washing, alcohol-washing and drying the reaction product to obtain the mercapto polyaniline. According to the mercapto polyaniline and the preparation method thereof, the mercapto group in the polyaniline obtained by the method can be prevented from being oxidized by the oxidant and oxygen in air in a preparation process, and experimental results show that the mercapto polyaniline has a number average molecular weight of 12,671 to 18,306 daltons and a weight average molecular weight of 17,112 to 20,303 daltons.

The invention relates to a smelting separation furnace lining material and a preparation method thereof. According to the technical scheme, the preparation method of the smelting separation furnace lining material comprises the following steps: mixing 48-60wt% of magnesite particles and 10-22wt% of silicon carbide particles, adding 3-4wt% of phenolic resin, mixing, then adding mixed powder, mixing, moulding, and then drying for 24 hours at the temperature of 180-220 DEG C, so that the melting separation furnace lining material is obtained; the mixed powder is obtained by mixing 10-15wt% of Ti(C,N)-SiC-C composite powder, 4-7wt% of magnesite fine powder, 1-3wt% of silicon carbide fine powder, 2-3wt% of crystalline flake graphite fine powder, 0.5-1wt% of carbon black, 1-3wt% of alpha-Al2O3 micro powder, 0.5-1.5wt% of asphalt powder, 2-4wt% of Si powder and 0.5-1wt% of B4C powder. The smelting separation furnace lining material has the characteristics of high temperature resistance, washing resistance, strong FeO and TiO2 corrosion resistance, good oxidation resistance and excellent thermal shock performance.

The invention discloses a light emitting diode and a manufacturing method thereof. In some embodiments, the light emitting diode comprises: a light emitting epitaxial layer which comprises a first semiconductor layer, a light emitting layer and a second semiconductor layer in order from top to bottom, and the upper surface of which is provided with a first electrode zone including a welding pad zone and an extension zone; an insulating layer formed on the extension zone of the first semiconductor layer; a transparent conductive layer formed on the surface of the first semiconductor layer and covering the insulating layer; a protective layer formed on the surface of the transparent conductive layer, forming a first opening in the extension zone, exposing a part of the surface of the transparent conductive layer of the extension zone; a first electrode formed on the protective layer, and including a pad portion and an extension portion, wherein the extension portion is electrically connected to the transparent conductive layer of the extension zone through the first opening.

The invention discloses an arsenic removal method used in a pyrometallurgucal process for antimony. The method comprises the following steps: heating crude antimony containing arsenic and a composite smelting agent to a molten state; smelting the above-mentioned molten raw materials to complete slagging and arsenic removal reactions; and finally, carrying out slag-antimony separation and repeating the previous steps several times to prepare a product; wherein the composite smelting agent comprises, by weight, 70 to 80 parts of anhydrous sodium carbonate, 10 to 15 parts of sodium nitrate, 0.5 to 5 parts of quartz sand and 1 to 3 parts of borax. With the composite smelting agent and a smelting method provided by the invention, 1000 ppm of arsenic in industrial No. 2 antimony is reduced to less than 10 ppm, the recovery rate of antimony is maintained to be more than 96%, and quality requirements of semiconductor thermoelectric materials and war industries on the raw material--antimony are completely met.

The invention provides an industrial preparation method of high-yield cinnamaldehyde. The method includes the following steps of: A, adding a solid catalyst and a water solution of polyethylene glycol 400 to a reaction vessel, then adding benzaldehyde; B, adding dropwisely 30 % to 50% by mass of an acetaldehyde water solution slowly with stirring, after the dropwisely adding, controlling the temperature from 25 DEG C to 30 DEG C for a reaction for 3 to 5 hours; C, performing washing after the completion of the reaction, and allowing the mixture to stand for delamination; and D, performing distillation after separating out an oil layer to obtain the cinnamaldehyde. The method in the invention is advantaged in operational simplicity, easiness in obtaining raw materials and in preparation of the catalyst, simple recovery, environmental friendliness, continuous operation, fast forward reaction speed compared with common processes, low probability of a side reaction, reduced unit energy consumption of a product as well as stable quality, high yield, and high purity of the produced cinnamaldehyde.

The invention belongs to the technical field of water-borne wood paint authentication, and particularly relates to a method for authenticating the truth or falsity of polyurethane water-borne wood paint on the basis of a nonlinear fingerprint graph. A water-borne wood paint sample is subjected to preliminary treatment to quicken the layering of sample emulsion, so that an organic phase and an inorganic phase are fully separated, and an emulsion breaking effect on samples is guaranteed; the method is convenient for subsequent detection; if acrylic acid water-borne wood paint is doped in the polyurethane water-borne wood paint, during detection, acrylic acid emulsion subjected to acidolysis in sulfuric acid solution generates acrylic acid with reducing properties; and the above products aremixed in a B-Z vibration system consisting of H+, BrO3, Mn2+ and acrylic acid, a sample to be authenticated and a standard sample are compared according to the extraction characteristic parameters ofthe nonlinear fingerprint graph, and the variety as well as the truth or falsity of the sample to be authenticated can be authenticated according to an integral similarity. In addition, the method hasthe advantages of being good in reproducibility, short in operation time, economic and the like, and is suitable to be widely prompted and applied in authentication fields of the polyurethane water-borne wood paint.

The invention provides a production technology of a green tea extract with a high EGCG content. In the production technology of the invention, the green tea extract is prepared by methods of digestion, adsorption, concentration, extraction, concentration drying, crystallization, drying and pulverization. The production technology of the green tea extract with the high EGCG content is simple and convenient, has high separation efficiency and short production cycle, and is low in cost and is suitable for large-scale and industrial production of the green tea extract with the high EGCG content.

This invention relates to the aluminum alloy damping canister production for motorcycle absorber, which uses aluminum silicon alloy containing more then 6% silicon and continious furnace, and polybasic new type alternative deteropate disposal, and it uses conduct to continiously inbreathe gas N2 into the continious furnace liquid outlet; the advantage of this invention is that the surface air hole occur rate is low, corrosion resistant capability is strong, and it produces fewer waste residue.

The invention belongs to the field of nonmetal surface metallization, and particularly relates to a surface metallization process of a dielectric ceramic filter. The surface metallization process comprises the following steps of ultrasonically cleaning the dielectric ceramic filter by using an organic solvent; carrying out high-temperature baking and heat preservation; then charging into a furnace, vacuumizing, heating and preserving heat; introducing argon into the furnace, and starting a Hall ion source to carry out sputtering cleaning on the surface of the dielectric ceramic filter; stopping introducing argon, and injecting metal ions into the surface of the dielectric ceramic filter by adopting a high-energy pulse ion injection method and a metal target; adopting a magnetron sputtering method, introducing argon and reducing gas, adoptinng a metal target, and depositing a metal layer on the surface of the metal layer subjected to ion implantation; and continuously introducing argon, and taking out the dielectric ceramic filter from the furnace after the dielectric ceramic filter is cooled. By means of the process, the film-substrate binding force between the ceramic substrate and a surface metal conductive coating can be effectively improved, and the dielectric ceramic filter obtained after metallization treatment has good electrical performance.

The invention provides an extraction method for panax notoginseng saponins. The extraction method comprises the following steps: enzymolysis treatment, aqueous extraction, macroporous resin adsorption, activated carbon adsorption and cation exchange resin adsorption, wherein citric acid is added for anti-oxidization in the step of aqueous extraction, so that the quality and yield of the product can be increased. The method adopts water as a solvent for digesting pseudo-ginseng and is beneficial to the reduction of residual organic solvent in the product.

The invention discloses a preparation method of a VNbMoTaW high-entropy alloy. The preparation method of the VNbMoTaW high-entropy alloy comprises the following steps that simple substance powder of W, Mo, V, Nb and Ta are mixed by adopting a mechanical alloying method firstly, ball milling is carried out without adding a ball milling medium to obtain single-phase or double-phase single-body centripetal cubic structure VNbMoTaW high-entropy alloy powder, then hot-pressing sintering is adopted, the pressure ranges from 30 MPa to 50 MPa, the heating rate ranges from 5 DEG C/min to 15 DEG C/min,the heat preservation temperature ranges from 1700 DEG C to 1900 DEG C, and the VNbMoTaW high-entropy alloy block with the single-phase single-body centripetal cubic structure and the density larger than 99.5% is obtained. The preparation method of the VNbMoTaW high-entropy alloy is simple in process, a block material with good performance can be obtained without being heated to the melting pointtemperature, the processing temperature is effectively reduced, the preparation cost is lower, and a very high industrial application value is achieved.

The invention discloses a preparation method of 4,4'-diaminobenzenesulphonamide. The method comprises the following steps of: based on acetanilide, chlorosulfonic acid, thionyl chloride, water, liquid caustic soda, p-phenylenediamine and the like as raw materials, implementing chlorosulfonation, ice separation, condensation, hydrolysis, neutralization, filter pressing and other processes to obtain the target product 4,4'-diaminobenzenesulphonamide. 4,4'-diaminobenzenesulphonamide prepared by the method disclosed by the invention is good in stability, quite stable, high in yield, and low in production cost.

The invention discloses a gum rosin processing unit adopting a vacuum filtration method, and the gum rosin processing unit comprises a dissolving device, a clarification plant and a distilling device, wherein the dissolving device comprises a dissolving kettle, a hopper and a grease feed tank; the dissolving kettle is connected with a direct water vapor source; the clarification plant comprises a vacuum filtering device and a negative pressure device matched with the vacuum filtering device; the negative pressure device comprises a vacuum cylinder and a low-position water-jet vacuum unit; the distilling device comprises a distilling kettle and a fraction purifying device; a grease liquid outlet of the dissolving kettle is technically connected with an inlet of the vacuum filtering device; a pure grease liquid outlet of the vacuum filtering device is technically connected with the inlet of the distilling kettle; and a distillation outlet of the distilling kettle is technically connected with the fraction purifying device. By replacing the traditional natural sedimentation clarification method by a vacuum filtration method, the gum rosin processing unit disclosed by the invention increases the clarification speed, reduces the time of the grease liquid in a high-temperature environment, increases good quality rate, reduces the amount of intermediate-layer grease liquid, and increases the yield of the product. The method mentioned in the invention is suitable for production of gum rosin adopting an intermittent or continuous vapor method.

The invention provides a cadmium tellude preparation method, which comprises steps of primary synthesis and secondary synthesis. The primary synthesis comprises the steps: putting tellurium and cadmium which are arranged in a staggered and up-and-down manner into a first graphite boat in a layered manner, putting the first graphite boat in a first quartz tube, and then placing the first quartz tube in a first synthesis furnace; filling first protective gas to discharge air in the first quartz tube; conducting three-section temperature increment, filling the first protective gas into the first section, and filling a first reducing gas into the second and the third section; filling the first reducing gas after the completion of synthesis reaction, and cooling down to an room temperature; and obtaining a first synthetic product. The secondary synthesis comprises the steps: putting the first synthetic product into a second graphite boat after being crushed, placing the second graphite boat into a second quartz tube, and placing the quartz tube into a second synthesis furnace; filling a second protective gas to discharge air in the second quartz tube; conducting two-section temperature increment, filling the second protective gas into the first section, and filling a second reducing gas into the second section; and after the completion of synthesis reaction, stopping heating, filling the second reducing gas, cooling down to the room temperature, so as to obtain a second synthetic product. Due to adoption of the method provided by the invention, the raw materials can be prevented from oxidation and being in contact with poisonous substances.

The invention discloses a pH-regulated p-type and n-type conversion thermoelectric material and a preparation method thereof. The method improves the n-type stability of a polyethyleneimine/carbon nanotube thermoelectric material by polyethyleneimine doping and pH regulation, a pH-regulated p/n conversion polyethyleneimine/carbon nanotube thermoelectric material is provided, and also, a new polyethyleneimine/carbon nanotube thermoelectric material preparation method with simple and convenient operation, good film formation, high conductivity and p/n regulation is provided.

The invention relates to a preparation method of a dendrobe extract at normal temperature. The method comprises the following steps: drying dendrobe, pulverizing, and adding into an infrared plasma surface modification device, wherein the device comprises a closed vacuumizable shell, an ultrasonic tank arranged in the shell, and an infrared transmitter and a plasma generator which are arranged on the ultrasonic tank; adding water into the ultrasonic tank, and adding Dendrobium officinale polysaccharide nanoparticles; and starting the ultrasonic device, infrared transmitter and plasma generator to perform extraction at normal temperature under the vacuum degree of 10-25 mmHg, and filtering to obtain the dendrobe extract. The method provided by the invention has the characteristics of low energy consumption, high cleanliness, environment friendliness and high yield.

The invention relates to the technical field of healthy food, and particularly discloses a compound anti-aging composition, a compound anti-aging tablet and a preparation method and application of the compound anti-aging composition and the compound anti-aging tablet. The compound anti-aging compositio is prepared from 100 to 200 parts of NMN, 2 to 3 parts of PQQ, 5 to 15 parts of quercetin, 200 to 400 parts of betaine and 300 to 400 parts of auxiliary materials, wherein the auxiliary materials comprise one or more of stevioside, calcium phosphate, magnesium stearate and silicon dioxide. According to the compound anti-aging compositio disclosed by the invention, the betaine is matched with the PQQ and the NMN, so that the cell osmotic pressure can be effectively regulated, the intestinal tract is protected, the stress reaction of the compound anti-aging compositio is reduced, and fat metabolism and protein synthesis of a human body are promoted; the effects of promoting energy metabolism of human cells and accelerating metabolism are also achieved while the immunity of the organism is enhanced; and the betaine can effectively reduce the probability that NMN, PQQ and quercetin are oxidized, so that the anti-oxidation, anti-inflammation and anti-aging effects of quercetin, PQQ and NMN on human cells after the quercetin, PQQ and NMN are compounded are further stimulated.