30results about How to "Overcome oxidation" patented technology

A squid ink polyose is prepared proportionally from the ink sac of squid, food-class lipase and food-class papain through proportional mixing, enzyme hydrolyzing, filtering, depositing in edible alcohol or chemical-purity acetone, dissolving deposit in deionized water, recovering alcohol or acetone, drying the deposit, and pulverizing. It has high stability.

The invention relates to an intelligent silver-contained antibacterial fiber and a preparation method and an application thereof. The intelligent silver-contained antibacterial fiber is of a core shell structure and comprises a core layer which takes a hollow fiber as a shell layer, is positioned in a cavity of the hollow fiber and is formed by silver-contained hydrogel; no through hole is arranged on the side wall of the hollow fiber; and elemental silver which occupies 0.1-10 percents of the intelligent silver-contained antibacterial fiber in total weight is contained in the silver-contained hydrogel. The intelligent silver-contained antibacterial fiber is safe and nontoxic and has the characteristic that the response is generated when the intelligent silver-contained antibacterial fiber is in contact with water, the release of silver ions is intelligently controlled, and the sterilization is quick and efficient. The preparation method of the intelligent silver-contained antibacterial fiber comprises the following steps of: pouring silver-contained hydrogel monomer solution from one end of the hollow fiber into the cavity of the hollow fiber and forming the silver-contained hydrogel core layer in the cavity of the hollow fiber through heat treatment. Manufactured process equipment is simple and can realize industrial production.

The invention discloses electroconduction slurry for silicon solar cell electrodes and a preparation method thereof. Copper-based metal powder replaces the traditional silver powder as an electric conductor for the electroconduction slurry, so that the preparation cost is reduced greatly; moreover, the problems of oxidation and diffusion of copper in the sintering process are overcome, and the electroconduction slurry can be completely compatible with the existing solar cell technology; the cost of the solar cell for preparing the positive surface electrode by utilizing the electroconduction slurry is reduced greatly, and the electroconduction slurry is more suitable for the need of photovoltaic large-scale application.

The integrated member type catalyst for selective oxidation of methyl aromatic hydrocarbon includes carrier, adhesive and active component. The active component is attached via the adhesive onto the carrier, and the carrier is porous honeycomb ceramic material, metal screen or corrugated metal sheet. The active component has the general expression of V1PaXbAlcMdCreOn. The catalyst is superior to available one, which has environmental pollution caused by liquid phase oxidation, complete oxidation and catalyst deactivation of 'hot point' in the catalyst bed, and has high selectivity and excellent industrial application foreground.

The present invention provides a preparation method of quickly-coagulable hydrogen storage alloy powder and its equipment. Said preparation method includes four procedures of raw material preparation, smelting, making powder and hydrogenation treatment. Said invention also provides the concrete steps of the above-mentioned every procedure. Said equipment includes induction furnace or argon plasma arc furnace, atomized powder-making device and hydrogenation device, etc.

The invention discloses a 3, 4-dihydropyrimidine-2(1H)-ketone and derivatives thereof and synthesis method and application thereof. The method comprises the following steps: taking biocatalyst Candida antarctica lipase B as a catalyst and taking vinyl acetate and isopropanol as raw materials to generate acetaldehyde in situ, and adding beta-dicarbonyl compound, urea and water to react with the in-situ generated acetaldehyde to manufacture 3, 4-dihydropyrimidine-2(1H)-ketone and derivatives thereof. By use of the method disclosed by the invention, the biocatalyst Candida antarctica lipase B is used as the catalyst, the vinyl acetate and isopropanol are used as the raw material to generate the acetaldehyde in situ; the in-situ generated cetaldehyde is simultaneously reacted with the beta-dicarbonyl compound, urea and water; the reaction method is simple and environment-friendly; the reaction efficiency is high, and the byproduct is less; the method is an environment-friendly, sustainable, simple and effective method for synthesizing 3, 4-dihydropyrimidine-2(1H)-ketone and derivatives thereof.

The invention relates to a semiconductor adhesive film material and a preparation method thereof, particularly a semiconductor adhesive film material for preparing lightning-protection shunt bars and a preparation method thereof. The invention aims to solve the technical problems of complex technique, incompatibility and nonmatching property caused by co-gluing or secondary gluing when other adhesives are adopted in the existing technique. The material is composed of the following components in parts by weight: 75-100 parts of epoxy resin, 15-30 parts of thermoplastic resin, 6-12 parts of rubber elastomer, 15-25 parts of curing agent, 2-6 parts of accelerator, 6-12 parts of non-metal conducting filler and 10-20 parts of non-metal semiconductor filler. The method comprises the following steps: 1. weighing; 2. preparing a resin mixture; 3. blending and discharging; and 4. calendering to form the film. The semiconductor adhesive film material has the characteristics of the structural adhesive film and also has the characteristic of resistance value of the semiconductor adhesive material. The semiconductor adhesive film material is used for preparing lightning-protection shunt bars.

The invention relates to a process for preparing MgB2 superconductive material, wherein according to mol ratio Mg:B=1:2, the invention weights Mg powder and B powder, and weights organic acid or organic acid salt at 5-30% weight of total Mg powder and B powder, to be dissolved in 5-50mL acetone or alcohol, mixes the solution with Mg powder and B powder, to be ball milled for 1-10h, to be dried ina vacuum drying box, tablets the powder, to obtain MgB2 superconductive block, or fills the powder into metal tube or metal composite tube, to be sealed and rotationally forged, drawn or rolled with 5% deformation ratio, to obtain MgB2 superconductive band, arranges the superconductive block or band into a vacuum furnace, under vacuum to argon gas protection and thermal treatment temperature as 650-950DEG C, to keep temperature for 0.5-2h, to obtain MgB2 superconductive material. The inventive MgB2 superconductive material can effectively overcome the oxidation and self-combustion problems ofhigh-energy ball milled refined magnesium powder, and the invention adds doping material to significantly improve the superconductivity of the MgB2 superconductive material.

The present invention relates to the technical field of preparation technology of a ceramic heating body, in particular to an integrally formed ceramic heating body and its preparation process. The integrally formed ceramic heating body is composed of 50-95% ceramic raw materials and 5-50% heating raw materials , the ceramic raw material is composed of 50‑95% Si 3 N 4 , 0.1-10% of MgO, 0.1-5% of Y 2 o 3 , 0.1‑5% Al 2 o 3 , 0.1‑5% SiO 2 , 0.1‑5% La 2 o 3 , 0.1‑5% BN composition, and the exothermic material is MoSi 2 , TiC or a mixture of two kinds; the preparation process of the ceramic heating body is mixing, ball milling, filtering, forming, pre-sintering, sintering, polishing and electrode connection processes. The manufacturing process is simple, which is conducive to continuous production and production. The efficiency is high, the production cost is low, and it is beneficial to realize large-scale production; the ceramic heating body of the present invention has long service life, stable power and high heating efficiency.

The invention relates to the field of printed circuit board manufacturing, in particular to a manufacturing method capable of protecting the surface of a blind hole board from oxidization.The manufacturing method mainly comprises a step S1 of manufacturing a multilayer board with blind holes; a step S2 of performing physical cleaning on a lowermost layer of the multilayer board; and a step S3 of performing press fit of the multilayer board and a metal base.The manufacturing method is simple in steps, the problem of oxidization of the surface of the blind hole board can be effectively solved, the problem that when the blind hole board is oxidized, manpower and material resources need to be spent for treatment is solved, resource and production time are greatly saved, and the production efficiency is improved.

The invention discloses a welding method for CO2 gas shielded welding, which selects a flux-cored wire with a deoxidizing agent component for welding, and comprises: before welding, removing moisture in the CO2 gas and cleaning impurities on a workpiece; and in the welding process, selecting reasonable welding conditions, current, voltage, electric arc and wire extending length, and controlling temperature and humidity of operating environment, wherein workpieces of which the thickness is less than 6mm are provided with I-shaped bevels; and workpieces of which the thickness is more than 6mm are provided with V-shaped bevels between 40.5 and 41.5 degrees. The method solves the problems that the oxidability of the CO2 gas shielded welding and the size of air holes and bevels influence material using amount, the formation of weld of the CO2 gas shielded welding is poor, and the like by the prior welding method.