94results about How to "Reduce film production cost" patented technology

The invention relates to a method for preparing a high-hydrophobicity microporous membrane. A polymer and a membrane-making diluent membrane liquid are uniformly mixed and then are coated on a solid template on the surface of a micro structure by virtue of a thermally induced phase separation method under assistance of a solid template; the microporous membrane is prepared by the thermally induced phase separation method; and under the synergistic effect of the template and phase separation, the hydrophobicity of the membrane surface and other membrane properties are improved. The microporous membrane is high in hydrophobicity; a water contact angle is up to 165 degrees at most, and a rolling angle is 3 degrees, so that the ultra-high hydrophobicity is reflected; the permeation performance is high; the nitrogen flux under the 0.1MPa membrane penetration pressure difference is more than or equal to 260 m<3>/(m<2>.h); an aperture distribution range is small; the maximum aperture is less than or equal to 0.5 microns; the mechanical performance is high; the tensile strength is more than or equal to 3.0 MPa; and the breakage elongation is more than or equal to 68 percent.

The invention discloses a hollow fiber composite membrane of an ultrathin active layer. the preparation method and the application thereof, belonging to the technique of hollow fiber composite membrane. The supporting layer of the composite membrane is polysulfone hollow fiber membrane, the active layer is poly-dopamine, the thickness is 15 to 90 nm. The preparation process includes: pretreatment is performed for the polysulfone hollow fiber membrane; hydrochloric acid dopamine with certain mass is added into Tris-HCI buffer solution with certain concentration and certain pH value, and then the supporting layer of the polysulfone hollow fiber is immersed into the solution to obtain the poly-dopamine/polysulfone hollow fiber composite membrane. The hollow fiber composite membrane is used for gas dehumidification, is in particular suitable for dehydration of propylene gases. The hollow fiber composite membrane, the preparation method and the application thereof have the advantages that the ultra-thin, flawless active layer with adjustable thickness can be prepared on the supporting layer, the preparation process is simple with excellent dehumidification performance; the raw materials are abundant, the price is reasonable and the production cost of the membrane is low.

The invention discloses a preparing method of a braided tube homogeneously-enhanced type polyvinylidene fluoride hollow fiber film, and belongs to the field of polymer film product preparation. The preparing method includes firstly preparing a polyvinylidene fluoride solution A having a certain low concentration, dipping a braided tube with the solution A to allow the polyvinylidene fluoride solution to penetrate into the inside of the braided tube, coating the outside of the braided tube with a high-concentration polyvinylidene fluoride film casting solution B having a certain formula, and putting the braided tube coated with the solution A and the solution B into a coagulating bath to allow the polyvinylidene fluoride coated in the two times to be subjected to phase separation simultaneously. The polyvinylidene fluoride hollow fiber film prepared by the method is advantageous in that 1) the inner low-concentration polyvinylidene fluoride solution tightly surrounds fibers of the braided tube, is tightly connected to an outer film layer after phase transition, and is not liable to shed; 2) a high-aperture-ratio compact surface layer is formed from the outer high-concentration film casting solution and provides effects of filtration; and 3) the braided tube with high strength provides excellent film fiber longitudinal stretching strength.

The invention belongs to the technical field of ceramic oxygen permeation membranes and particularly relates to a preparation method for a hollow fiber ceramic oxygen permeation membrane with a dual composite asymmetric structure. The preparation method comprises the following steps of: respectively preparing a membrane casting solution A and a membrane casting solution B which are different in oxygen permeation ceramic membrane material powder content, wherein the ceramic powder content of the membrane casting solution A is higher than that of the membrane casting solution B; spinning into a coagulation bath through a triple-concentric ring hole-contained spinning jet by taking the membrane casting solution A as an inner layer material and the membrane casting solution B as an outer layer material, solidifying, and then, forming; straightening and airing a solidified and formed hollow fiber membrane precursor; and sintering at high temperature to obtain the required hollow fiber oxygen permeation membrane. Compared with the ceramic oxygen permeation membranes prepared by a conventional method, the oxygen permeation rate of the hollow fiber ceramic oxygen permeation membrane with a dual composite asymmetric structure, which is prepared by the preparation method, is increased by 5.2-22 times, wherein the inner surface and outer surface of the hollow fiber ceramic oxygen permeation membrane are porous and the middle is compact. Moreover, one-time forming and one-time sintering are adopted. The process is simple, the operation is convenient, the membrane preparation cost is low, and industrial production can be conveniently implemented.

The invention provides a preparing method of an alloy high temperature oxidation resisting nanostructure conductive coating, i.e. a spinel powder reduction coating method. On one hand, coating powdermaterial with favorable sintering performance is obtained by the regulation and control of the preparing process of coating powder material and effective reductive treatment; on the other hand, a nanometer microstructure film is prepared on the alloy surface by adopting silk screen assisted improved sizing agent coating technology. The film has controllable and even thickness and superior performance, and coating is tightly combined with the alloy; the coating alloy has lower area specific resistance (ASR) and higher long-time running stability under high temperature oxidation environment. Thespinel powder reduction coating method originated by the invention has simple film manufacturing method, low cost and strong repetitiveness, can be applied to coating preparation of alloy with different shapes or sizes, has superiority especially when preparing the large-area alloy coating in practical application, can greatly lower the preparing cost of the alloy coating and has strong applicability.

The invention discloses a preparation method of a polymeric micelle nanofiltration membrane and application thereof, which belongs to the field of porous material separation membranes. The polymer membrane is mainly attached to a macroporous substrate, and a polycarbonate membrane is chosen as the substrate layer. The preparation method of the micelle membrane comprises the following steps: a polymer with an appropriate block proportion and molecular weight is chosen to be dissolved in selective solvent, so that a micelle solution with a specific morphology is formed; the micelle solution is uniformly dispersed, spread onto the macroporous substrate by the vacuum filtration technology and naturally dried, and thereby the block copolymer separation membrane prepared by the dilute micelle solution is obtained. The voids formed between the piled micelles serve as part of membrane pores, thus playing the role of selective separation, while the macroporous substrate of the lower layer helpsincrease the separation efficiency of the membrane. Most of the current methods for preparing polymer membranes are complex and consume a great deal of energy. The membrane production method is universal and simple, the needed cost is low, and moreover, the produced membrane has high separation efficiency, and can be applied to the separation of different sizes of gold nanoparticles.

The invention discloses a liquid-phase preparation method of a high-oriented vanadium dioxide film, belonging to the field of chemical function materials. The preparation method comprises the following steps: preparing precursor liquid by taking triisopropoxyvanadium oxide as solute, coating a sapphire substrate with the obtained precursor liquid to prepare a precursor film, and finally sintering the precursor film in a vacuum environment. According to the preparation method, the vanadium dioxide film is prepared by controlling vacuum sintering conditions on the basis of a liquid-phase method, the obtained film is good in growth orientation, the phase change temperature of the film is about 60 DEG C, and the change of electrical resistivity before and after the phase change is more than three orders of magnitude; in addition, the preparation process is simple and suitable for large-range popularization.

The invention discloses a hollow fiber membrane and a preparation method of the hollow fiber membrane. The hollow fiber membrane is characterized in that a mass percent formula of a membrane forming system comprises the following components in percentage by weight (the sum of the components is 100%): 12-30% of a polymer, 70-88% of an organic solvent and 0-10% of an additive, wherein the polymer is a general membrane forming polymer or a modified product; the organic solvent is a good solvent of the polymer and can be mutually dissolved with water; the additive is a substance capable of reacting with water or a water solution to generate gas. The preparation method is a simplified solution spinning method comprising the steps of: firstly preparing the polymer membrane forming system according to the formula, putting the polymer membrane forming system into an injection syringe or other conveniently-extruded containers, extruding polymer membrane forming liquid from a syringe needle or other pipelines under the pushing action of an injection pump or the other containers, soaking the extruded polymer membrane forming liquid into pure water or a water solution which can be an acid water solution or an alkali water solution according to different additives, solidifying and forming the membrane forming system by virtue of the water solution, meanwhile, reacting the additive with water, forming a cavity of the hollow fiber membrane due to the expansion of the generated gas, and finally obtaining the hollow fiber membrane.

The invention relates to a preparation method of a proton exchange membrane used in fuel cells. The invention specifically relates to a preparation method of a cross-linked polyphenyl ether composite proton exchange membrane. According to the method, polyphenyl ether is dissolved in a chlorobenzene solution, such that a high-molecular solution is prepared; gamma-mercaptopropyl triethoxysilane or gamma-mercaptopropyl trimethoxysilane is added; the mixture is heated and stirred such that a solution is formed; the solution is cast on a glass plate and is dried and cross-linked, such that a membrane is formed; the cross-linked polyphenyl ether composite membrane is soaked and oxidized in a hydrogen peroxide solution under room temperature, such that the cross-linked polyphenyl ether composite proton exchange membrane is obtained. The composite proton exchange membrane provided by the invention has excellent proton conductivity, wherein the proton conduction rate is higher than that of a Nafion membrane. The membrane provided by the invention also has good stability. A swelling degree of the membrane provided by the invention is smaller than that of the Nafion membrane. The method provided by the invention also has the advantages of simple process and convenient operation. A membrane production cost is lower than that of the Nafion membrane. The method is suitable for industrialization.

A solution casting method comprises the following steps of: dissolving a solute in a solvent to prepare a casting solution; preparing a casting plate by float glass; arranging a heating device on an insulation base plate; arranging a rack on the periphery of the heating device and putting the casting plate on the rack; arranging a cooling water jacket on the insulation base plate, and letting the cooling water jacket encircle the heating device, the rack and the casting plate; arranging a condensed solvent collecting tank at the bottom of the cooling water jacket; pouring the casting solution into the casting plate; arranging an insulation top cover over the cooling water jacket, and sealing the internal space encircled by the cooling water jacket and the insulation base plate; starting the heating device to heat the casting solution so as to completely evaporate the solvent in the casting solution; continuously heating to further raise crystallization degree of a film; stopping heating, and peeling the film off from the casting plate; detecting the film thickness, adjusting the heating field, and raising thickness uniformity of the finished product film. The method provided by the invention has advantages of simple technology, cheap equipment and low film preparation cost. the finished product film has advantages of high degree of crystallization, isotropy, uniform thickness, few impurities, good appearance, high yield and the like.

The invention discloses a microwave hydrothermal preparation method of a NiTiO3 nano film, comprising the following steps: adding analytically pure nickel nitrate hexahydrate in ethanol to obtain a solution A; adding analytically pure tetrabutyl titanate, citric acid, water and acetylacetone in the solution A to obtain a solution B; placing a silicon substrate in hydrogen peroxide for ultrasonic oscillation and drying; pouring the solution B in a hydro-thermal reaction kettle, placing the silicon substrate in the hydro-thermal reaction kettle and immersing in film-coating liquid; sealing the hydro-thermal reaction kettle and placing in an MDS-8 type warm-pressing double control microwave hydro-thermal reactor; selecting a temperature controlling mode or a pressure controlling mode to react, and cooling naturally to the room temperature after reaction; and opening the hydro-thermal reaction kettle, taking the silicon substrate, respectively washing with deionized water, absolute ethyl alcohol or isopropanol, and drying to obtain the final product NiTiO3 nano film. The reaction can be finished in liquid phase in one time, post-treatment is avoided, the process equipment is simple, and the obtained film has high purity and favorable uniformity.

The invention discloses a preparation method of a persistently hydrophilic polyvinylidene fluoride membrane. The preparation method includes the steps: (1) casting membrane solution preparation: dissolving polyvinyl acetate and additives into solvents, adding polyvinylidene fluoride and then dissolving the polyvinylidene fluoride in the solvents to obtain casting membrane solution; (2) persistent hydrophilic polyvinylidene fluoride membrane preparation: preparing the persistent hydrophilic polyvinylidene fluoride membrane from the casting membrane solution prepared in the step (1) by a phase inversion method. The additives are compositions of one or more of polyvinylpyrrolidone, polyethylene glycol, polyvinyl alcohol, polymethyl methacrylate, lithium chloride, potassium chloride, titanium dioxide, silicon dioxide and oxidized graphene. The polyvinylidene fluoride membrane has the advantages of good and persistent hydrophily, high discharge capacity and interception rate, strong anti-pollution performance and simple preparation method.

The invention relates to a cold isostatic pressing forming preparation method of a nickel oxide-based ceramic target material, wherein the method comprises the following steps: A, preparing raw materials: preparing mixed powder of nickel oxide powder and doped source powder, wherein the total mass fraction of doped source elements in the mixed powder is not more than 10%, wherein the doping sourceelement is selected from one or more of 0-6% of Li, 0-0.3% of Na, 0-1.0% of Mg, 0-0.1% of Al, 0-0.1% of Si, 0-0.15% of K, 0-12% of Zn, 0-1.5% of Zr, 0-1.2% of Mn, 0-10% of Cu, 0-1.2% of Cr, 0-0.3% ofV, 0-10% of W and 0-2.5% of Ti; B, carrying out spray drying; C, compacting by vibration; D, feeding a mold into a cold isostatic pressing chamber for pressing; E, degumming a biscuit; F, sintering;G, cooling after heat preservation is finished; and H, machining or not machining according to needs. The preparation method can be used for preparing the nickel oxide-based ceramic which is good in conductivity, relatively high in purity and fine in grain size.

The invention relates to high-purity and high-activity nickel oxide-based powder, a preparation method and application. The nickel oxide-based powder is mixed powder containing nickel oxide powder anddoping source powder, wherein the total mass fraction of doping source element in the mixed powder is not higher than 10%, the doping source element is selected from one or more of 0-6% of Li, 0-0.3%of Na, 0-1.0% of Mg, 0-0.1% of Al, 0-0.1% of Si, 0-0.15% of K, 0-12% of Zn, 0-1.5% of Zr, 0-1.2% of Mn, 0-10% of Cu, 0-1.2% of Cr, 0-0.3% of V, 0-10% of W and 0-2.5% of Ti, the purity of the nickel oxide powder and the doping source powder is higher than 99.99%, the average particle size is 500 nm-2 [mu]m, and the D50 particle size is 50-800 nm. According to the invention, the powder is high in purity, and the particle size reaches the nanoscale, so that the activity of the powder is improved, and the conductivity of ceramic prepared from the powder is improved.

The invention relates to a solvothermal preparation method of a silicon-surface vertically-assembled CeO2 nanorod film, which comprises the following steps: preparing a precursor solution by using ethanol as a solvent, and reacting the raw materials CeCl3 and CO(NH2)2 under the solvothermal conditions of 160-200 DEG C by using a clean silicon chip as a base to prepare the film formed by vertically assembling CeO2 nanorods on the silicon chip surface. The method has the advantages of simple equipment and low film-preparation cost, and does not need to perform high-temperature treatment on the silicon base and film. The prepared film is vertically assembled from the CeO2 nanorods, is thin and uniform, has the advantages of high visible light transparency, favorable adhesiveness and high ultraviolet resistance, has very strong emission peak at 380-390nm, and has wide application prospects in the aspect of crystalline silicon solar cell ultraviolet resistance.

The invention relates to a hot press molding preparation method of a nickel oxide-based ceramic target material. The method is characterized by comprising the following steps that A, raw materials areprepared; B, spray drying is carried out; C, a mixed powder body prepared in the step B is put into a hot pressing mold; D, pre-pressurizing and degassing are carried out on the mold; E, hot pressingsintering is carried out, specifically, the pressure intensity is 5-100 MPa, the vacuum degree is 0.1-10 Pa, the sintering temperature is 600-950 DEG C, the heat preservation time is 2-5 h, and the temperature rising speed is 0.5-3 DEG C/min; D, after heat preservation is finished, pressure is relieved, and sintered blanks are taken out; and E, machining is carried out or not carried out according to needs. Through the method the nickel oxide-based ceramic target material with good conductivity, higher purity and fine grain size can be prepared, and the method can realize net size forming andis high in efficiency.

The invention discloses a polyvinyl alcohol hybridized membrane pervaporation device for laboratories and a permeation separation technology thereof. The device comprises a raw material cavity, a pervaporation membrane, a permeation side cavity, a pervaporation pressure adjusting device, a heat exchange device, a penetrating fluid condensing device, a seeping tank and a permeation side vacuum pump device, wherein a polyvinyl alcohol (PVA) and tetraethyl orthosilicate (TEOS) hybrid membrane is taken as the pervaporation membrane. By adopting the device, the problems that a traditional separation technology in the prior art is high in energy consumption and low in separation efficiency can be effectively solved. Due to the fact that a polyvinyl alcohol hybrid membrane for pervaporation is added with tetraethyl orthosilicate, the mechanical performances, such as swelling property and fragility, of the polyvinyl alcohol membrane are improved; the compactness of the polyvinyl alcohol membrane is improved; the permeation flux of the membrane is reduced; the selectivity of the membrane is improved; an esterification reaction is facilitated; and the conversion rate of the esterification reaction is improved.