203results about How to "Green preparation" patented technology

The invention belongs to the technical field of inorganic functional materials, in particular to a method for preparing a large-size, flexible and unsupported nano-silver-graphene composite film having the Raman enhancement effect, which comprises the following steps of: obtaining silver ion-graphene oxide colloid solution by adsorbing silver ions through self-assembly by utilizing strong adsorption function of graphene oxide and the functions of a thin plate, obtaining a silver ion-graphene oxide film through a vacuum suction filtration process, processing the obtained film through a high-temperature heat treatment reduction process, and finally, obtaining the nano-silver-graphene composite film. The nano-silver-graphene composite film prepared by the invention has excellent Raman enhancement effect.

The invention discloses a core-shell type cationic/anionic polyacrylamide profile control oil displacing microsphere and a preparation method thereof. The core-shell type cationic/anionic polyacrylamide profile control oil displacing microsphere with a micrometer particle size range is prepared in one pot by adopting a dispersion polymerization method, and the whole preparation process is continuously completed by two steps: firstly synthesizing a core part of a microsphere, and then synthesizing a shell part of the microsphere. The core part of the microsphere consists of water-soluble monomer acrylamide, an ionic monomer I and a crosslinking agent; the shell part of the microsphere consists of water-soluble monomer acrylamide, an ionic monomer II and a crosslinking agent; and the ionic monomer I and the ionic monomer II have opposite charges. The particle size of the core-shell type cationic/anionic polyacrylamide profile control oil displacing microsphere is 1-200mu m. The preparation method is simple in preparation process, the whole preparation process is environmentally friendly and low in cost; and a solvent can be recycled, and the recycling rate is above 80 percent. The core-shell type cationic/anionic polyacrylamide profile control oil displacing microsphere is used as a profile control oil displacing material, and has excellent injectivity and mobility.

The invention discloses a preparation method for hydrocarbon fuel and methanol, which is characterized in that a wood powder, a lignin, a lignin monomer and (or) a lignin monomer and/or dimer is used as a raw material, the raw material and a hydrogenation catalyst are filled into a high-pressure autoclave, the pH value of an aqueous phase reaction system is adjusted to 2 to 7, hydrogen is charged into the reaction system under the normal temperature, and the temperature is increased to 40 to 350 degree centigrade, the reaction is executed for 0.2 to 5 hours under 40 to 350 degree centigrade, and the product is divided into two phases after the reaction is completed and the temperature is decreased, the upper layer phase is the hydrocarbon fuel, the lower layer aqueous phase is a methanol solution; the molar ratio of the hydrogenation catalyst and the raw material is 1:10-10000. Compared to the traditional prepared hydrocarbon fuel and methanol, the preparation method for hydrocarbon fuel and methanol has the advantages of economy with wide resources of the raw material and low cost, environment protection, simplicity with simple process, high efficiency with high utilization ratio of the raw material and high productivity, which takes an important role in the utilization of the lignin, hydrocarbon fuel and methanol preparation field with a wide application prospect.

The invention discloses a graphene-cyclodextrin composite nanofiltration membrane with high pollution resistance and a preparation method of the graphene-cyclodextrin composite nanofiltration membrane, belonging to the technical field of membranes. The composite nanofiltration membrane is prepared by uniformly depositing a selective separation layer on a porous polymer supporting layer by using the method disclosed by the invention, wherein the selective separation layer is formed by compounding and assembling graphene and cyclodextrin. By using the method disclosed by the invention, the cyclodextrin can be effectively intercalated among graphene sheet layers which are compactly stacked. The nanofiltration membrane prepared by using the preparation method disclosed by the invention is good in pollution resistance, high in water flux, high in retention rate (approach to 100%) of organic dyes, relatively high in salt removing rate of the organic dyes and favorable in pollution resistance to organic pollutants such as proteins and polysaccharides. The preparation method disclosed by the invention is simple and easy, strong in controllability, relatively low in production cost and free of pollution so as to have favorable application prospects in the nanofiltration field.

The invention relates to perovskite composite oxide LaFeO3 monodisperse micrometer hollow balls and a preparation method thereof, and belongs to the technical field of micro nanometer functional materials. The micrometer hollow balls are in a monodisperse state, the outer diameter of each micrometer hollow ball is between 1 and 7 micrometers, and the micrometer hollow balls are in a perovskite crystalline phase. The preparation method comprises the following steps of: stirring a mixed solution containing urea serving as an additive, citric acid serving as a complexing agent, deionized water serving as a solvent and metal nitrate uniformly, transferring the mixed solution to an autogenous pressure kettle, putting into a constant temperature box, keeping temperature for a certain time, cooling naturally, performing suction filtration on the obtained products, drying, grinding, and roasting at high temperature to obtain the highly-monodispersed LaFeO3 micrometer hollow balls. According to the preparation method, a template is not needed to be utilized, the reaction time is short, the preparation process is environment-friendly, and the operation is easy to implement.

The invention relates to a preparation method of a rigid structure reinforced phenolic aerogel heat shielding material. The method includes: firstly dissolving phenolic resin in a solvent in a vacuum impregnation container to form a phenolic solution, then pressing a three-dimensional fiber structure into the phenolic resin solution, and conducting vacuum pumping on the vacuum impregnation container, after a period of time, opening a seal cover to maintain smooth air pressure with the outside and conducting standing for a period of time, then taking out the three-dimensional fiber structure and putting it into an oven to perform drying, and conducting high temperature curing to form a rigid three-dimensional fiber structure, then mixing resorcinol, furfural, ethanol and sodium hydroxide uniformly in proportion in the vacuum impregnation container to form a reactant solution, then pressing the rigid three-dimensional fiber structure into the solution, conducting vacuum pumping on the vacuum impregnation container again, maintaining the state for a period of time, then placing the vacuum impregnation container into the oven to carry out sol-gel process, and finally taking out the gel-containing three-dimensional fiber structure and performing drying, thus obtaining the rigid structure reinforced phenolic aerogel product.

The invention discloses tea leaf protein polypeptide and a preparation and application thereof. Based on the total weight of the tea leaf protein polypeptide, the tea leaf protein polypeptide comprises 57 to 64 w/w percent of a component with the molecular weight of 6,000+/-100 Da and 33 to 39 w/w percent of a component with the molecular weight of between 300 and 1,000 Da; and the nitrogen solubility index (NSI) is between 98.5 and 99.9 percent. The preparation method for the tea leaf protein polypeptide comprises the steps of taking tea leaves, tea grounds or deep processing rejected materials of the tea leaves as raw materials and performing hydrolysis through a complex enzyme A. The tea leaf protein polypeptide has a variety of biological functions.

The invention relates to an Ag-doped TiO2 material, a preparation method and an application of the Ag-doped TiO2 material, and belongs to the technical field of preparation of semiconductor-doped catalytic materials. The preparation method is a one-step solvent hot method, and specifically comprises the following steps: completely dissolving silver nitrate into ethylene glycol; dropwise adding butyl titanate; carrying out suction filtration and drying on the solution after the solution is reacted and cooled to obtain an Ag-doped urchin-shaped TiO2 material, wherein the material is urchin-shaped, a TiO2 crystal form is a single phase of anatase and rutile or the mixed phase of the anatase and the rutile, and the material can be used in the field of photocatalysts. The Ag-doped TiO2 material, the preparation method and the application have the beneficial effects that the preparation method is a simple one-step solvothermal method; an Ag nano-particle-doped urchin-shaped TiO2 catalyst can be prepared in large batches by using the preparation method; the obtained sample is not required to be subjected to subsequent calcining treatment and has high photocatalytic activity; the structure and the shape of the obtained product are easy to control; the preparation process is simple and environment-friendly; the Ag-doped TiO2 material is expected to be applied to the aspect of treating organic pollutants which are difficult to degrade.

The invention relates to a synthetic method of a polynitrogen azole zinc/cadmium framework material. The method comprises the following steps of: mixing a polynitrogen azole ligand with a metering ratio of a metal polynitrogen azole framework chemical formula, an oxide or a hydroxide with a reaction liquid, carrying out an acid-base reaction after activation, and filtering, washing and drying after the reaction to obtain the polynitrogen azole zinc/cadmium framework material. The synthetic method has mild reaction conditions, and the polymerization process of the polynitrogen azole ligand and the solid oxide or the hydroxide is accelerated by utilizing the coordination buffer action of ammonia to enable the reaction to be rapidly and efficiently finished. The method has simple operation and low production cost and does not generate any other byproducts except a required product and water, the obtained product is easy to activate, and a residual mother liquid can be directly used as the reaction liquid for the next batch of synthesis, thereby realizing continuous production and being particularly suitable for large-scale industrialized production.

The invention discloses a plant essential oil chitosan nano microcapsule. The plant essential oil chitosan nano microcapsule comprises a wall material and a core material, wherein the wall material isprepared from chitosan and a cross-linking agent in an acetic acid water solution or an ionic liquid water solution through cross linking; the core material is prepared from plant essential oil and mannose erythritol ester. The plant essential oil chitosan nano microcapsule disclosed by the invention has better encapsulation efficiency and better particle diameter, the destruction to active components of essential oil can be reduced, the volatility of the essential oil is effectively reduced, the photo-thermal stability of the essential oil is increased, and the effect acting time of the essential oil is prolonged; liquid essential oil is stored in a solid form while the essential oil is not destroyed; a preparation process is safe, non-toxic and green; the application range of the plantessential oil is greatly expanded.

The invention discloses a hot-rolled automobile structural steel plate with the yield strength of 420MPa and excellent cold-forming performance and a manufacturing method. The hot-rolled automobile structural steel plate with the yield strength of 420MPa and the excellent cold-forming performance comprises, by weight, 0.03-0.06% of carbon, 0.7-0.9% of manganese, 0.020-0.030% of niobium, 0.020-0.030% of titanium, less than 0.10% of silicon, no more than 0.005% of sulfur, no more than 0.015% of phosphorus, no more than 40 ppm of nitrogen, 0.025-0.050% of acid soluble aluminum, and the balance iron and inevitable impurities. According to the hot-rolled automobile structural steel plate with the yield strength of 420MPa and the excellent cold-forming performance and the manufacturing method, the Nb-Ti microalloying technique is adopted for a short process, S and N (S<=0.005%, and N<=40 ppa) in steel are fixed through a trace of Ti, the grain refining effect of Nb is brought into full playto obtain a fine F+P structure, and thus the cold-forming performance of the steel is improved while high strength is obtained.

The invention discloses a method for preparing methyl levulinate in near-critical methanol by a plant polysaccharide alcoholysis on-pot method. The method comprises the following steps: 1) adding methanol, plant polysaccharide and acid catalyst in a high pressure reaction kettle, wherein the mass concentration of the plant polysaccharide is between 10 and 120g/L, and the molar concentration of the acid catalyst is between 0.01 and 0.06 mol/L, replacing air in the kettle by nitrogen after the kettle is closed, and starting stirring; 2) heating the materials to the temperature of between 160 and 200 DEG C for alcoholysis for 1 to 10 hours; 3) cooling the materials to the room temperature after the alcoholysis is completed, and opening an exhaust valve to collect dimethyl ether; and 4) regulating pH value of the alcoholysis solution to be neutral, distilling the solution under the normal pressure to remove low-boiling products and solvent, and distilling the solution under reduced pressure to obtain the methyl levulinate. The method has the advantages of biomass raw materials, abundant resources and simple and green one-pot preparation process, and has important industrial application value.

The invention discloses a self-lubricating hydrophobic silicone-acrylic emulsion. The self-lubricating hydrophobic silicone-acrylic emulsion comprises the following components in parts by weight: 90-120 parts of mixed monomers, 1.0-6.0 parts of a hydrophobic lubricant, 1.0-4.0 parts of a functional monomer, 0.5-3.0 parts of a coupling monomer, 0.2-1 part of a cross-linking aid, 2-4 parts of an emulsifier, 1.0-3.0 parts of a co-emulsifier, 0.75-2 parts of an initiator, 0.5-3 parts of a pH buffering agent and 90-180 parts of water, wherein the mixed monomer includes a hard monomer and a soft monomer, the hard monomer is at least one selected form the group consisting of styrene and methyl methacrylate, and the soft monomer is at least one selected form the group consisting of butyl acrylate,ethyl acrylate, and 2-ethylhexyl acrylate. In addition, the invention provides a waterborne anti-fouling coating including the self-lubricating hydrophobic silicone-acrylic emulsion. The self-lubricating hydrophobic silicone-acrylic emulsion of the invention has a core-shell structure, which facilitates uniform distribution and rapid release of the hydrophobic lubricant; and the waterborne anti-fouling of the invention has good mechanical properties and anti-fouling properties, small sliding angle on water and good self-cleaning performance.

The invention provides a preparation method of a molybdenum disulfide-tourmaline composite material and relates to a composite material. The molybdenum disulfide-tourmaline composite material is prepared by a microwave hydrothermal method. The preparation method comprises the following steps: treating tourmaline, preparing a reactant raw material mixed liquid of molybdate, sulfide and tourmaline;pouring the reactant raw material mixed liquid into a polytetrafluoroethylene reaction kettle, placing the polytetrafluoroethylene reaction kettle into microwave hydrothermal equipment and completingmicrowave hydrothermal effective composition of the reactants; and washing and drying the product obtained by the microwave hydrothermal method to prepare the molybdenum disulfide-tourmaline compositematerial. The defects in the prior art for preparing the molybdenum disulfide composite material that the molybdenum disulfide composite material is liable to gather or stack again in the drying or annealing process as well as the defects of complex preparation process, long reaction cycle, high energy consumption and high cost are overcome.

The invention discloses a particle-reinforced iron-based composite material and a ball milling preparation method and application thereof. The iron-based composite material takes single metal iron as a mother matrix, and particle reinforcement bodies, which are large in hardness, are utilized to be arranged uniformly in the iron matrix in the ball milling process. The particle reinforcement bodies can serve as grinding materials in the ball milling process, thereby accelerating the ball milling process; and since the particle reinforcement bodies are uniformly distributed in the particle reinforcement bodies, a plurality of high reaction activity regions are formed between the particle reinforcement bodies and an iron interface. The particle reinforcement bodies comprise at least one of quartz sands, aluminum oxides, boron carbide and silicon carbide. The preparation method is simple and practicable, and the used materials are cheap and easily available. The particle-reinforced iron-based composite material can carry out reducing degradation on halogenated and nitro organic pollutants in waste water effectively; processing effect is efficient and stable; pH is wide in application range; and material repetition utilization rate is high.

The invention discloses nano zero-valent iron manganese bi-metal and a preparation method and application thereof. The nano zero-valent iron manganese bi-metal is prepared by two-step liquid-phase reduction with divalent iron salt as an iron source and divalent manganese salt as a manganese source. According to the preparation method, the technology is simple, raw materials are easy to obtain, requirements for equipment are low, the process is simple, the controllability of reaction conditions is high, the dispersion of the nano zero-valent iron can be effectively improved by the addition of Mn, agglomeration of the nano zero-valent iron is prevented, meanwhile the passivation of the nano zero-valent iron is slowed down, and the prepared nano zero-valent iron manganese bi-metal has excellent reaction activity; and the nano zero-valent iron manganese bi-metal prepared by the preparation method has high catalytic oxidation reducing capacity, and has good removal effect on organic pollutants, meanwhile good migration and distribution characteristics and good degradation ability are achieved in simulated groundwater environment, and the nano zero-valent iron manganese bi-metal can be applied to the degradation and removal of organic pollutants in surface water or groundwater.

The invention discloses a method for rapidly preparing a polymelamine conductive polymer electrode and an application thereof. The melamine conductive polymer electrode can be rapidly prepared under the condition of solid state electrochemical polymerization and by taking melamine as a monomer, water as a solvent, and glassy carbon as a working electrode. A polymelamine conductive polymer film with redox activity is obtained on the surface of the electrode. Cyclic voltammetry testing is carried out on the polymelamine conductive polymer electrode in solutions with different pH to obtain a series of redox peaks, and pH values of the solutions can be detected according to the relationship between the pH value of the solution and the oxidation peak potential value. The method has the advantages of being green, controllable, simple in operation, and the like, can be used for quantitative detection of the pH values in water samples, and is rapid and accurate in detection.

The invention discloses a high-orientation layered graphene aerogel phase change composite material and a preparation method thereof, and belongs to the field of phase change energy storage. The preparation method specifically comprises the steps of carrying out hydrothermal reaction on graphene oxide suspension in a segmented heating manner to obtain reduced graphene hydrogel; performing pre-freezing treatment; performing vacuum freeze drying to obtain a layered aerogel material; performing high-temperature carbonization or graphitization treatment; and compounding with a phase change material through vacuum impregnation. The graphene aerogel prepared by the method disclosed by the invention can be repeatedly rebounded and is not easy to break; and the highly-oriented layered graphene aerogel phase-change composite material prepared by the method has excellent oriented heat-conducting property, high energy storage property and good leakproof property, and has a wide application prospect in the field of phase-change energy storage.

The invention discloses a graphene oxide/polyacrylamide composite filtering thin film. The polymer polyacrylamide is used as a spacer between graphene oxide flake layers, and the graphene oxide/polyacrylamide composite filtering thin film with nanometer size and enhanced water flux and filtering property is prepared. The graphene oxide/polyacrylamide composite filtering thin film has the advantages that a graphene oxide flake layer stacking structure is formed, and the surface of each graphene oxide flake layer is uniformly attached with flexible hydrophilic macromolecular polyacrylamide underthe function of electrostatic adsorption; the graphene oxide/polyacrylamide composite filtering thin film is prepared from the following components in percentage by mass: 90+/-3% of graphene oxide, and 10+/-3% of polyacrylamide, wherein the molecular weight of the polyacrylamide is 1,000,000 to 3,000,000. Proofed by experiment, the graphene oxide/polyacrylamide composite filtering thin film has the advantages that compared with the graphene oxide thin film, the hydrophilcity is better, and the distance between the flake layers is 0.68nm; the water flux and filtering property are excellent, and the graphene oxide/polyacrylamide composite filtering thin film is expected to be widely applied to preparation of water flux or filtering property equipment.

The invention discloses a titanium phosphate composite material and a preparation method and application thereof. The method comprises the steps of: enabling a lithium source, a titanium source, a phosphorus source and a carbon source to be subjected to dry ball milling I, and obtaining mixed powder I; mixing the mixed powder I with an additive aqueous solution, and drying to obtain a mixed material; carrying out dry ball milling II on the mixed material to obtain mixed powder II; and sintering the mixed powder II to obtain the carbon/titanium phosphate composite material. The method is simplein process and easy to operate, uniform dispersion of the raw materials during mixing can be guaranteed through dispersion of the additive aqueous solution in the method, the hardness of dried material particles can be reduced, and the whole preparation process is green, environmentally friendly and free of pollution; and when the titanium phosphate composite material prepared by adopting the method is used as a negative electrode of an aqueous lithium ion battery, the specific capacity of a half battery is close to 88mAh/g, and obvious attenuation is avoided after 100 cycles.

The invention discloses an organic-inorganic hybrid cation exchange membrane for alkali recovery in manners of diffusion and dialysis as well as a preparation method and an application of the membrane. The diffusion and dialysis membrane consists of an organic phase and an inorganic phase, wherein the organic phase is polyvinyl alcohol (PVA); the inorganic phase is a mixture of silanol and alkoxy silane; and the cation exchange membrane has a moisture content of 38-105 percent, an ion exchange capacity of 0.30-2.10 mmol/g, an alkali dialysis coefficient of 0.010-0.025 m/h and a separation factor of 11.3-33.5. The organic-inorganic hybrid cation exchange membrane as well as the preparation method and the application of the membrane has the beneficial effects that the silanol containing an ion exchange group is directly introduced, the ion exchange capacity is obtained, therefore, the reaction process is simple and controllable; as the whole reaction process is carried out in a water phase, and no organic solvent is required, the reaction process is green and environmentally-friendly; and the obtained hybrid cation exchange membrane has high mechanical strength and high thermal stability and can be applied to the field of alkali recovery.

The invention discloses regenerated cellulose nano-particles and a preparation method thereof. The method comprises the following steps: thermally gelating a cellulose solution, soaking to prepare cellulose hydrogel, soaking the cellulose hydrogel a PEO water solution to obtain a cellulose gel/PEO/water mixture, dewatering the cellulose gel/PEO/water mixture obtain a PEO/cellulose primary mixture, and finally further mixing the PEO/cellulose primary mixture by a fusion mixing method to obtain the cellulose nano-particles which are uniformly dispersed in PEO. The method provided by the invention is green and environment-friendly, consumes low energy and employs simple equipment; the end products are in stable solid state, that is, the cellulose nano-particles are uniformly dispersed in PEO, are convenient and stable to store and transport, and are free of a drying process during further application. PEO in the mixture can take the functions of a dispersing agent, a surface modification agent and the like at the same time. Different from the conventional fibrous nano fiber material, the regenerated cellulose nano-particles prepared according to the method are spherical particles and aggregates thereof.

The invention relates to an environment-friendly temperature-resistant salt-resistant plugging filtrate loss reducer applied to low-solid-phase saltwater drilling fluid and a preparation method of theplugging filtrate loss reducer. The plugging filtrate loss reducer is prepared from the following raw materials: natural macromolecular polysaccharide, wood powder, an antioxidant, a cross-linking agent and a conditioning agent. The plugging filtrate loss reducer prepared by the method has double effects of carrying out film formation filtrate loss reduction and plugging filtrate loss reduction,has certain self-emulsification performance, lubrication performance, inhibition performance and non-tackifying performance, is high in capability of improving mud cake quality and high in capabilityof plugging, further has excellent temperature resistance, excellent salt resistance and high capability of reducing filtrate loss, is prepared by a one-pot process, is produced by a convenient process, is high in cost performance, is environmentally friendly in the production and usage processes, and is especially applicable to various types of low-solid-phase saltwater drilling fluid systems.