117results about How to "The preparation process conditions are mild" patented technology

The invention relates to a preparation method of a silver particle with a sheet-strip integrated structural shape. The preparation method of the silver particle with the sheet-strip integrated structural shape comprises the following step of preparing the silver particle with the sheet-strip integrated structural shape by a chemical liquid-phase reduction method by taking deionized water or distilled water as a solvent, a soluble silver salt as a silver source, an organic acid and/ or an organic acid salt and an inorganic acid as main shape controlling agents, a small molecular alcohol and/ or ketone as a modifier, and ascorbic acid and/ or ascorbate as a reductant, wherein the silver particle has an integral structure consisting of silver by sheet-shaped silver and strip-shaped silver; the width of the sheet-shaped silver is between 2-20 microns and adjustable; the thickness of the sheet-shaped silver is 100-300 nanometers and adjustable; the length of the strip-shaped silver is 5-50microns and adjustable; the width of the strip-shaped silver is 200-500 nanometers and adjustable; and the thickness of the strip-shaped silver is 100-300 nanometers and adjustable. The preparation method of the silver particle with the sheet-strip integrated structural shape is mild in preparation conditions; and prepared silver particles are high in yield and high in purity.

The invention provides a nitrogen-doped lithium sulfur battery cathode material, a preparation method and an application. Sodium chloride, melamine and starch are mixed in water; precursor gel is obtained through gelatinization reaction; the precursor gel is freeze-dried, baked at high temperature, soaked and washed; and sodium chloride is removed to obtain nitrogen-doped porous carbon powder. Inorganic salt sodium chloride is added as a pore forming agent, which enables the product to have a uniform micro nano pore structure and high specific surface area. Finally, sulfur particles are loadedby sulfur fumigation to obtain a nitrogen-doped porous carbon-loaded sulfur composite material as a lithium sulfur battery cathode material. The porous structure of the composite material provides alarge number of active sites, which helps to bind polysulfides and inhibit the shuttle effect of polysulfides. The material has good cycle stability and high specific capacity when used as a lithium sulfur battery cathode material. In addition, the preparation method of nitrogen-doped porous carbon has the advantages of mild process conditions, simple steps, cheap raw materials and easy large-scale production.

The invention discloses a chiral alpha-(trichloromethyl) amine compound and a preparation method thereof. The chiral alpha-(trichloromethyl) amine compound is a potential bioactive molecule synthesis building block and can serve as an important midbody for synthesizing chiral chloric amine compounds, such as 2,2-dichloro aziridine. The preparation method of the invention has moderate technological condition and abundant and cheap raw materials, and the prepared alpha-(trichloromethyl) amine has high optical purity and is convenient to industrially apply. The alpha-(trichloromethyl) amine prepared by the invention can be widely applied in the fields of asymmetric synthesis and medicine research and development. The structural general formula is disclosed in formula (3).

The invention discloses a precipitated iron catalyst for Fischer-Tropsch synthesis and a preparation method thereof. The catalyst comprises the following components in parts by weight: 100 parts of Fe, 0.3-20 parts of Mn, 0.1-15 parts of Ti, 0.2-10 parts of Cu, 0.3-10 parts of K and 3-40 parts of SiO2. By optimizing the components in the catalyst and ratios, the final precipitated iron catalyst has good degree of sphericity, higher abrasion strength and high specific surface area. Besides, the preparation process has the advantages of mild conditions, higher CO conversion rate and reaction activity, high long chain hydrocarbon C<5+> selectivity, low byproduct CH4 and waste product CO2 selectivity, reasonable hydrocarbon product distribution and low contents of methane and carbon dioxide in the final product, is suitable for industrial production of oil products and wax obtained by virtue of Fischer-Tropsch synthesis, is economical, simple and convenient and can be used for continuously producing a microspheric precipitated iron manganese-titanium system catalyst for Fischer-Tropsch synthesis.

The invention provides a method for preparing silicon dioxide aerogel from quartz tailings as a raw material. The method comprises the following steps: step 1, the quartz tailings are washed, dried, ground and sieved and then ground and mixed with sodium carbonate powder, a mixture is calcined, and a calcination product is obtained; step 2, the calcination product is ground and sieved, undersized matter is added to hot water to be stirred and dissolved, the solution is filtered, a filtrate is taken, and water glass is obtained; step 3, the pH value of the water glass is regulated with hydrochloric acid, a sol-gel reaction is performed, a product is left to stand for aging, and hydrogel is obtained; step 4, free water in the hydrogel is filtered out, residual moisture is replaced with absolute ethyl alcohol, and alcogel is obtained; step 5, the alcogel is soaked with an n-hexane solution of trimethylchlorosilane, and hydrophobically modified alkane gel is obtained; step 6, drying is performed, and the silicon dioxide aerogel is obtained. The raw materials are cheap and available, the preparation process adopts mild conditions and has low equipment requirements, so that the production cost of the silicon dioxide aerogel is reduced greatly, and the prepared aerogel has good performance.

The invention discloses a preparation method of a zeolite imidazole framework structure material. According to the method, a zeolite imidazole framework structure is subjected to ion exchange to become a composite of two metal ions, wherein post-exchanged particles have a nuclear magnetic resonance effect. The method is mild in reaction condition, easy to operate and low in raw material cost and comprises simple steps. The zeolite imidazole framework structure contrast medium prepared with the method has good water solubility, improved application safety, small toxicity to normal cells and efficient contrast effects.

The invention discloses a nano-hydroxyapatite/chitosan/chondroitin sulfuric acid composite stent with high biological response and a preparation method of the nano-hydroxyapatite/chitosan/chondroitin sulfuric acid composite stent. The preparation method comprises the steps of: using chitosan/chondroitin sulfuric acid as an organic matrix and using a calcium-phosphor salt solution as an inorganic phase precursor; fully uniformly mixing a chitosan/chondroitin sulfuric acid acetic acid solution with a soluble calcium-phosphor salt solution, crosslinking with a crosslinking agent, carrying out injection molding and forming, carrying out in-situ biomimetic mineralization crystallization in alkaline liquor, freezing and drying to obtain the nano-hydroxyapatite/chitosan/chondroitin sulfuric acid composite stent with high biological response. The preparation method can be used for simulating a composition and a structure of natural bone on the aspect of material preparation, is mild in preparation condition, and is simple to operate; and the prepared material can be randomly shaped and re-machined according to the use demand.

The invention discloses an oil-soluble/water-soluble organic-inorganic three-phase porous micro-nanometer composite bone repair material and a preparation method thereof. From the bionic angle, for better simulating the components, structure and function of natural bone tissues, chitosan and collagen are selected as water-soluble organic matrixes; an oil-soluble high-molecular material polylactic acid is added for improving the performance; a water-soluble phase can be combined with an oil-soluble phase by crosslinking; an in-situ crystallization process of inorganic calcium and phosphorus mineral in the natural bone tissues under the regulation and control of organic matrix biological large molecules is simulated by a hybridization method; a nanometer hydroxyapatite crystal is synthesized on the matrix; an artificial bone defect repair scaffold similar to natural bone extracellular matrix is molded and prepared by utilizing a freeze-drying phase separation technology. The preparation method of the oil-soluble/water-soluble organic-inorganic three-phase porous micro-nanometer composite bone repair material disclosed by the invention is simple in procedures and mild in condition; the prepared composite scaffold is similar to natural bone matrix in constitution and structure, has a typical micro-nanometer structure (micrometer-grade hole diameter size and nanometer crystal), is excellent in performance and high in figurability and can be processed into required shapes.

The invention discloses a catalyst for catalyzing and oxidizing carbon monoxide at low temperature and a preparation method thereof. The catalyst comprises an active component Pd, additive Fe and a carrier, wherein the carrier is active carbon modified from chitosan; and the active component Pd and the additive Fe are loaded on the carrier. In the catalyst, the mass of the active component Pd is 0.5 to 3 percent of that of the carrier, and the mass of the additive Fe is 3 to 24 percent of that of the carrier. The preparation method of the catalyst comprises the following steps: adopting a step impregnation method, acidizing the active carbon, treating the acidized active carbon with chitosan solution, then sequentially soaking and absorbing the additive Fe and the active component Pd, filtering, washing and drying to obtain the catalyst. The catalyst is characterized by low precious metal content, high activity at low temperature, good moisture resistance property and the like.

The invention belongs to the technical field of organic chemical industry, and relates to a synthetic method of a precursor of an imidacloprid pesticide intermediate 2-chloro-4-formyl valeronitrile. According to the synthetic method, propionaldehyde and chlorine gas are taken as initial raw materials, 2-chloride propyl aldehyde is prepared via substitution, and catalytic addition with acrylonitrile is carried out so as to obtain 2-chloro-4-formyl valeronitrile via synthesis, and total yield is stabilized to be higher than 70%. According to the synthetic method, chlorine substitution and addition two-step reaction is adopted, 2-chloro-4-formyl valeronitrile is prepared, the synthetic method is simple in technological process, low in production cost, and low in equipment investment, and is suitable for industrialized production, and raw material recovery is convenient to realize.

A preparing method of a ternary copolymerized water reducer is disclosed. The method includes adding a proper amount of water, modified polyether and a molecular weight regulator into a reactor, stirring, dissolving to obtain a modified polyether solution, heating to 70-85 DEG C, adding dropwise a monomer mixture of acrylic acid and acrylamide and an aqueous initiator solution at the same time, after addition of the monomer mixture and the aqueous initiator solution is finished, continuously reacting at maintained temperature for 2-4 h, cooling after the reaction is finished, adding an alkali for neutralizing, and adjusting pH of the solution to 7-8 to obtain the modified polyether-polyacrylic acid-polyacrylamide ternary copolymerized water reducer. The method reduces raw material costs, is mild in preparation process conditions, low in cost and capable of meeting environment protection requirements. The water reducer can improve early-stage strength and final-strength of concrete perforated brick setting structures. Properties of the water reducer are superior to those of polycarboxylate water reducers of the same series in the market. The water reducer has a high cost performance ratio and high market competiveness.

The invention discloses a honeycomb-shaped TiO2 porous microsphere using microporous starch as a template and a preparation method thereof. According to the method, starch is hydrolyzed by bio-enzymeto obtain the microporous starch; dispersing agents and bonding agents are added into nanometer TiO2 to obtain nanometer TiO2 emulsion; the microporous starch and the nanometer TiO2 emulsion are mixed; centrifugation is performed; precipitates are dried and ground to obtain the honeycomb-shaped TiO2 porous microsphere. The TiO2 is directly loaded onto the microporous starch; the adsorption performance of the microporous starch is used for preparing the microporous microsphere; the prepared TiO2 porous microsphere has high specific surface area, high specific pore volume and good adsorption performance; the unique advantage of improving the light capturing efficiency and photocatalytic performance is realized; the template removal treatment is not needed; the honeycomb-shaped TiO2 porous microsphere can be directly used as a photocatalyst; the catalysis efficiency is high; the preparation process conditions are mild; the production period is short; the raw materials are cheap and can beeasily obtained; the environment-friendly effects are achieved; wide application prospects are realized in an aspect of organic pollution degradation through photocatalysis.

The invention provides a novel preparation method of ethyl (3R,4R,5S)-4-acetylamino-5-amino-3-(1-ethylpropoxy)-1-cyclohexene-1-carboxylate phosphate, and belongs to the technical field of chemical drug synthesis. An acetamido group is introduced into the construction process of oseltamivir phosphate molecules by using a Ritter reaction. The preparation way of the initial raw material in the invention is close to the shikimic acid end of a natural product, so the novel preparation method has the advantages of mild conditions, simplicity in operation, high total yield, and suitableness for commercial production of oseltamivir phosphate bulk drugs. The method successfully avoids an original research route to overcome protection period limitation of an original research and preparation methodpatent, and can accelerate the solving of the problem of medication accessibility of the medicine in China.

The invention relates to a high-conductivity and heat-resistant aluminum alloy and a preparation method thereof, and belongs to the technical field of aluminum-based alloys. The aluminum alloy is prepared from, by mass, 1.5-3.2% of Mg, 0.7-2.8% of Si, 0.2-0.5% of Ni, 0.06-0.25% of Co, 0.1-0.2% of Zr, 0.1-0.4% of Y, and the balance Al and inevitable impurities with the total content of less than orequal to 0.03%. The conductivity and the heat resistance of the high-conductivity and heat-resistant aluminum alloy can be remarkably improved, so that the aluminum alloy better meets the requirements of high-voltage transmission.

The invention relates to the field of Fischer-Tropsch synthesis iron-based catalysts, and discloses a Fischer-Tropsch synthesis iron-based catalyst, a preparation method thereof, and a Fischer-Tropschsynthesis method. The preparation method comprises: (1) etching a first mixture of an iron-containing oxide and an acid solution at 20-120 DEG C for at least 2 h to obtain a dispersed slurry; (2) mixing the dispersion slurry, an M salt, a copper salt, a potassium salt, a silicon-containing compound and optionally water to obtain a second mixture; (3) adjusting the pH value of the second mixture to 4-9 to obtain a third mixture; and (4) carrying out spray drying treatment and roasting treatment on the third mixture. The preparation method provided by the invention has the advantages that the preparation process flow is simple; no catalyst needs to be washed, and water consumption is low; compared with a melting method, the preparation process is mild in condition and low in energy consumption; and the prepared catalyst has high reaction activity, high and low carbon olefin selectivity and high added value of the product.

The invention discloses a nitrogen-doped graphite-like carbon nitride visible-light-induced photocatalyst as well as a preparation method and application thereof. According to the method, a thermal stripping-solvothermal combination preparation method is adopted, and the synthesized N-g-C3N4 has excellent photocatalytic performance. According to the method, melamine is used as a raw material, common organic solvents such as N,N-dimethylacetamide are used for synthesizing the N-g-C3N4 photocatalyst through a solvothermal reaction, the method has the advantages that the operation is simple, theraw materials are easy to obtain, no additive is added, the cost is low, the application condition is mild, and the method is environmentally friendly, and a reference scheme is provided for nitrogenatom doping. The N-g-C3N4 photocatalyst disclosed by the invention is excellent in performance and good in stability, has great application potential in the aspect of photocatalytic degradation of organic pollutants, and has photocatalytic degradation efficiency of 95% or above on organic dyes such as rhodamine B under visible light.

The invention discloses a gridding photovoltaic backboard and a preparation method thereof. The preparation method comprises the following steps: coating a white grid structure on the inner layer of adouble-sided coating type transparent base material by utilizing a polyvinylidene fluoride membrane casting solution containing titanium dioxide; subjecting the treated base material to precipitationand solidification through a phase inversion method; and carrying out post-treatment on the solidified base material. The gridding photovoltaic backboard has good weather resistance, a white grid area has high reflectivity, a non-white grid area has high transmittance, the generation power of a photovoltaic module is effectively improved, and the production process is high in forming speed, mildin process, economical and environmentally friendly.

The invention discloses an extreme-pressure anticorrosive additive and preparing method of benzo ribavirin polysulfide, whose chemical name is which is characterized by the following: adapting 1-chloride benzo ribavirin and alkali metal polysulfide to do chemical reaction at mild technological condition; obtaining benzo ribavirin polysulfide as lubricating grease extreme pressure, anticorrosive additive or with other composite lubricating grease.