67results about How to "Good production repeatability" patented technology

The invention relates to a method for preparing nano-zeolite metal-organic framework compounds by a microreactor, and belongs to the technical field of preparation of nano-particles, which is characterized by comprising the following steps of: constructing a microreactor by a porous film; respectively dissolving a metal precursor and an organic ligand in a solvent to prepare a metal precursor solution A and an organic ligand solution B; respectively arranging the metal precursor solution A and the organic ligand solution B at two sides of the film; by a pressure difference of the two sides of the film, uniformly pressing reactants at one side of the film into reactants at the other side of the film through the pores of the film, to generate nano-particles; and centrifuging, washing and drying to obtain the target product. The method for preparing the nano-zeolite metal-organic framework compounds by the microreactor is simple in operation, strong in controllability of particle structure, and is suitable for preparation and industrial production of various nano-zeolite metal-organic framework compounds.

The invention discloses a method for preparing a positively charged polyvinyl chloride (PVC) hollow fiber nanofiltration membrane. The positively charged PVC hollow fiber nanofiltration membrane has a two-layer structure consisting of a positively charged compact skin layer and an electrically neutral porous support layer; the pore diameter of micropores of the compact skin layer is 1-5nm, and the pore diameter of micropores of the porous support layer is 10-100nm; and the outer diameter of the membrane is 1.5-3.0mm, and the inner diameter of the membrane is 0.5-2mm, wherein the positively charged compact skin layer comprises main components of polyvinyl chloride and cationic copolymer; and the electrically neutral porous support layer comprises main components of polyvinyl chloride and an inorganic filler. The method for preparing the positively charged PVC hollow fiber nanofiltration membrane comprises the following steps of: co-extruding positively charged compact skin layer membrane preparing liquid and electrically neutral porous support layer membrane preparing liquid in a two-layer ring shape; and curing and forming hollow fibers by using a dry-wet spinning process. The prepared hollow fiber nanofiltration membrane has the advantages of easily controlled interception property, high strength, simple preparation process and the like, and is a high-performance, low-cost and long-life nanofiltration membrane material for water treatment.

The invention discloses a polyester flat microporous membrane and a preparation method thereof. The microporous membrane comprises the following materials in percentage by mass: 60-99.9% of polyester and 0.1-40% of modifier; or 20-40% of non-woven fabric, 60-79.9% of polyester and 0.1-30% of modifier. The preparation method is realized on the basis of a thermally induced phase separation process and comprises the following steps: mixing the polyester, the modifier and diluter into a homogeneous solution at high temperature; scraping the homogeneous solution into a liquid membrane, cooling andcuring into a membrane so as to form a precursor membrane subject to microphase separation, and extracting to obtain a flat microporous membrane. The prepared polyester flat microporous membrane is in a spongeous structure with the pore diameter of 0.05-5.0 micrometers and the porosity of 30-80%, and has the advantages of narrow pore diameter distribution, uniform pore size, easily controlled pore size, high strength, symmetrical structure and the like, thereby being a filter membrane material for water treatment and a lithium ion battery diaphragm material with high performance, low cost andlong life.

The invention relates to a dopamine-modified metal organic compound/polyether co-polyamide mixed substrate membrane for gas separation, and belongs to the technical field of membrane separation. The dopamine-modified metal organic compound/polyether co-polyamide mixed substrate membrane is characterized in that the dopamine-modified metal organic compound/polyether co-polyamide mixed substrate membrane is mainly made of dopamine, metal organic compounds and polyether co-polyamide; the surfaces of the metal organic compounds are modified by the dopamine at first, then the modified metal organic compounds and the polyether co-polyamide are mixed and stirred with one another at certain temperatures, and the dopamine-modified metal organic compound/polyether co-polyamide mixed substrate membrane with a controllable thickness can be obtained by the aid of scrape coating technologies. Compared with the traditional metal organic compound mixed substrate membranes, the dopamine-modified metal organic compound/polyether co-polyamide mixed substrate membrane has the advantages that defects of interfaces between the metal organic compounds and polymer substrates can be obviously improved, and the affinity of the metal organic compounds and the polymer substrates can be improved; the dopamine-modified metal organic compound/polyether co-polyamide mixed substrate membrane is high in gas permeation flux, has a high separation factor and is particularly applicable to separating carbon dioxide in the air.

A method for preparing multicomponent oxide containing Ni and Co includes preparing mixed ammonia complex solution by materials of Ni and Co as well as the other metal M in buffer solution; adding prepared ammonia complex solution and aqueous alkali slowly into reactor simultaneously to generate Ni-Co-M composite hydroxide by coprecipitation then obtaining forerunner after aging, separating, washing and drying; mix-grinding forerunner and lithium hydroxide to obtain final product of Lia(NibCoc) M1-b-cO2 after heat treatment.

The invention discloses a preparation method of polyurethane polishing material; the polyurethane polishing material is prepared by a 'rapid three-step method' technology, so that the viscosity and the reaction head of all reaction stages can be better controlled, the demands that the material has a certain aperture ratio and solid filler is rapidly and evenly mixed can be met, and the effects of stable operation and good production repeatability can be achieved; and a prepared polyurethane polished section is even in foams, the service life and the cutting rate are greatly improved, and the highest yield reaches up to more than 95%.

The invention relates to a green preparation method of a silicon rubber/silicon dioxide pervaporation membrane based on emulsion film forming and belongs to the technical field of membrane separation. The green preparation method has main characteristics that (1) mixing and emulsifying water-soluble sol, a surfactant and polysiloxane to prepare water-in-oil polysiloxane emulsion, wherein the diameter of water-phase liquid drops is 1-45 microns; and (2) adding a catalyst and a cross-linking agent and mixing to obtain an emulsion type membrane casting solution, coating the emulsion type membrane casting solution on a polyvinylidene fluoride ultrafiltration membrane, and carrying out drying and cross-linking to prepare the silicon rubber/silicon dioxide pervaporation membrane. Based on an emulsion film forming technology, any organic solvent is not added in a membrane preparation process, so that volatile organic steam is not generated and a green and environment-friendly membrane preparation concept is met. The prepared hybridized silicon rubber pervaporation membrane has the characteristics of large permeation flux, good separation effect, stable structure and the like, is suitable for removing low-concentration organic matters in water and is particularly suitable for separating low-molecular-weight alcohols in a fermentation solution.

The invention discloses a modified halloysite nanotube/polyether copolyamide mixed matrix membrane and a preparation method thereof, which belong to the technical field of membrane separation. The method is characterized in that polyether copolyamide is used as a polymer substrate, and halloysite nanotubes are used as an inorganic filler. The method comprises the following steps of firstly, carrying out surface etching on the halloysite nanotube, and then carrying out surface coating modification on the etched halloysite nanotube, and blending the modified halloysite nanotube with polyether copolyamide to prepare the mixed matrix membrane. The preparation process is simple and easy to operate, and the prepared mixed matrix membrane is applied to CO2/N2 gas separation and has good separation performance.

The invention relates to a preparing method of a chlorine-resistance aromatic polyamide composite nanofiltration membrane, and belongs to the technical field of membrane separation. According to the preparing method, through interficial polymerization between polyamine and aromatic acyl chloride, a polyamide layer is generated; a membrane is immersed in an activation solution, the unreacted acyl chloride in polyamide is hydrolyzed to carboxyl, and then the carboxyl is activated to active ester; the polyamine serves as a connecting unit of the active ester and oxidized graphene quantum dots, the oxidized graphene quantum dots are grafted on the surface of a polyamide membrane, and preparation of the chlorine-resistance aromatic polyamide composite nanofiltration membrane is achieved. According to the preparing method, the chlorine-resistance aromatic polyamide composite nanofiltration membrane is prepared by adopting interficial polymerization first, and then conducting quantum dot modification afterwards; the preparing technology is simple, the operation is convenient, and the production repeatability is high.

The invention discloses a filter membrane for removing low density lipoproteins, and a preparation method thereof. The filter membrane comprises, by weight, 10-25 parts of amphiphilic chitosan, 20-35parts of sulfonic group-modified cellulose acetate, 2-6 parts of poly(2-methacryloyloxyethyl phosphorylcholine) and 1-4 parts of sodium oleate. The filter membrane can effectively reduce the LDL level in the blood, has a good filtering effect on VLDL, TC and TG, has few influences on the level of beneficial proteins in the blood, such as high density lipoproteins, albumins and immunoglobulin IgG,is suitable for purifying the blood of clinical hyperlipidemia patients, can also be applied to the finishing industry of blood products, and can be combined with relevant separation auxiliary devices to recover useful plasma from the waste human plasma that does not meet the blood transfusion standards and produce blood products with high added values.

The invention relates to a polyethylene glycol functionalized montmorillonite/polyether copolyamide mixed matrix membrane used for gas separation, belonging to the technical field of membrane separation. The mixed matrix membrane is characterized in that montmorillonite, polyethylene glycol, a silane coupling agent and polyether copolyamide are used as main raw materials; the silane coupling agent is used for modifying montmorillonite at first; then modified polyethylene glycol is grafted onto the modified montmorillonite; the grafted modified montmorillonite is mixed with polyether copolyamide at a certain temperature under stirring; and knife coating is carried out so as to obtain the polyethylene glycol functionalized montmorillonite/polyether copolyamide mixed matrix membrane with controllable thickness. The polyethylene glycol functionalized montmorillonite/polyether copolyamide mixed matrix membrane prepared in the invention has excellent tensile strength and fracture elongation and high permeation flux and separation factors, and is especially applicable to separation of carbon dioxide in the air.

The invention belongs to the field of solid luminescent materials, and particularly relates to perovskite quantum dot glass and a preparation method and application thereof.The perovskite quantum dot glass is prepared through a pressure-adjustable high-temperature-resistant closed container, the boiling point of a quantum dot precursor can be increased through high pressure, volatilization of raw materials is reduced, and due to the closed environment, the performance of the perovskite quantum dot glass is improved. The volatilization of raw materials can be effectively controlled from the source, the size uniformity of the quantum dots in the glass is greatly improved, and the raw materials are not wasted and the environment is not polluted. Besides, the annealing step and the high-temperature melting step are carried out in the same closed container, so that the temperature and the shape of the glass melt can be prevented from being rapidly changed, the thermal stress of the glass is reduced, the product yield is improved, meanwhile, the process operation is simpler and more convenient, the production repeatability is better, the heat energy of the annealing step is saved, and the production cost is reduced. Therefore, the preparation method disclosed by the invention can be suitable for industrial large-scale production.

The invention relates to a hyperbranched polysiloxane multilayer film and a preparation method thereof. The following process steps are adopted: 1) After reacting hyperbranched polysiloxane, solvent, 107 glue and catalyst at 60-80°C for 12 hours, Form a casting film feed solution, and apply the gained casting film solution on the polyvinylidene fluoride porous base film to obtain a hyperbranched polysiloxane film; 2) vinyltriethoxysilane, solvent, 107 glue, and catalyst After reacting at 60-80° C. for 6 hours, a casting film material solution is formed, which is coated on the above-mentioned hyperbranched polysiloxane film to obtain a hyperbranched polysiloxane multilayer composite film. The hyperbranched polysiloxane multilayer composite membrane prepared by the present invention has a three-layer membrane structure, the bottom layer is a polyvinylidene fluoride ultrafiltration membrane supported by non-woven fabric, the middle layer is a hyperbranched polysiloxane membrane, and the top layer is separated The layer is an extremely thin polysiloxane film. The hyperbranched polysiloxane multilayer composite membrane prepared by the invention has a gradient distribution of porosity from top to bottom, which greatly improves the performance of pervaporation separation of butanol in water.

The invention belongs to the technical field of membrane preparation, and mainly relates to a modified magnesium oxide/polyether copolyamide nano composite membrane and a preparation method thereof. The method comprises the following steps of modifying magnesium oxide by using a titanate coupling agent as a modifier, dissolving the modified magnesium oxide and polyether copolyamide to prepare a membrane casting solution, and finally preparing the membrane casting solution into the membrane. The problems that magnesium oxide is poor in dispersity in a polymer substrate and poor in compatibility with polymers are solved, and the prepared modified magnesium oxide/polyether copolyamide nano composite membrane has high gas permeation flux and separation factors and is suitable for CO2/N2 separation.