56results about How to "Low film resistance" patented technology

The invention discloses a preparation method for a polystyrene/polyvinylidene fluoride cation exchange membrane. According to the method, polyvinylidene fluoride is used as a matrix material for the membrane. The method comprises the following steps: dissolving polyvinylidene fluoride and then fully mixing dissolved polyvinylidene fluoride with styrene and a cross-linking agent so as to obtain a homogeneous polymer solution; carrying out heat-initiated crosslinking copolymerization so as to obtain gelatinoid with an interpenetrating network structure; subjecting the gelatinoid to polymer physical processing so as to obtain polystyrene/polyvinylidene composite powder; then preparing cation exchange powder by using a sulfonation method for a storng-acid cation exchange resin as reference; and finally preparing the cation exchange membrane by using a hot pressing molding method for a heterogeneous cation exchange membrane. The polystyrene/polyvinylidene fluoride cation exchange composite high polymer membrane prepared in the invention has the interpenetrating network structure, so the structural defect of incompatibility between cation exchange resin powder and a high polymer binder in conventional heterogeneous cation exchange membranes is eradicated, membrane resistance is substantially reduced, and comprehensive properties of the polystyrene/polyvinylidene fluoride cation exchange membrane in the invention are closer to comprehensive properties of cation exchange membranes.

A reinforced perfluoro ion exchange film is composed of at least two layers of ionic film, which prepared from perfluoro ion exchange resin and fused together without interface, at least one layer of perfluoro polymer mesh as reinforcing material and the perfluoro polymer microfibres added to said filming resin. It is prepared through sequential coating. Its advantages are low film resistance, high electric current efficiency, and high mechanical strength and size stability.

The invention relates to an aqueous transparent heat insulation paint, which contains, by weight, 2.0-5.0 parts of a nanometer ITO compound powder, 37.5-40.5 parts of distilled water, 44-55 parts of a waterborne FEVE fluorocarbon resin emulsion and 7.5-8.5 parts of an HDI curing agent, wherein the grain size range of the ITO compound powder is 20-50nm. The preparation method provided by the invention comprises the following steps of: adding distilled water into a reaction container, adding the nanometer ITO compound powder into distilled water by high speed dispersion for 15-50 minutes until the powder becomes a paste, adding the obtained paste into the FEVE emulsion, followed by middle speed dispersion for 15-50 minutes to obtain an intermediate product, adding the HDT curing agent into the intermediate product with stirring, followed by middle speed dispersion for 15-50 minutes to obtain the product. The product provided by the invention has excellent heat insulation performance and low price, can be used for microwave attenuation and can also be used in fields such as a glass paint for buildings.

The invention relates to a uniwafer type bipolar ion exchange membrane and a method for preparing the same. An anion exchange layer and a cation exchange layer of a bipolar membrane are combined on two sides of the same carrier material respectively or the same side of a uniwafer type ion exchange membrane. The preparation method comprises the following steps that: a, according to certain proportion, an evocating agent, a functional monomer, a comonomer, a crosslinking agent and other additional compositions are prepared into a reaction solution of the corresponding ion exchange layer; and b, according to different carriers, the method carries out single side or double side coating treatment, that is the reaction solution is coated on the carrier material with certain thickness; the carrier material is positioned in an ultraviolet source and is radiated so that the carrier material is cured to obtain the ion exchange layer of one side; the other side of the ion exchange layer is coated with another reaction solution, positioned in the ultraviolet source and is radiated and cured, and according to requirements, cured membrane is positioned in a corresponding ionized treating solution and treated to obtain an ion exchange layer; and the bipolar membrane of the uniwafer type ion exchange layer is finally obtained. The voltage drop of two sides of the membrane is reduced; and the method has low cost and rapid reaction speed and is simple and feasible.

A perfluorinated ion exchange membrane fusing-casting reinforced film includes reinforced substrate and ion change layer. Said reinforced substrate is a perfluorinated polymer biaxially oriented film. Said ion change layer is formed by solution casting method, having the perfluorinated ion exchange resin containing sulfonic acid group and/or carboxylic acid group as film forming resin. The film without abrupt interface between the ion exchange layers is formed by the means of solution casting and program coating so as to make the ion exchange group concentration between the ion exchange layers and different ion exchange layers achieve molecule horizontal combination and greatly improve the interface compatibility. The ion exchange membrane has a lower film resistor, a higher current efficiency, a high film planeness, extremely good mechanical strength and dimensional stability. The invention also provides producing method thereof.

The invention provides a high exchange capacity perfluorinated resin of two types of short side-radical sulfonyl fluoride with different structures and bromine side-radical. The resin is a polyprotonic copolymer comprising the following components in total molar fraction: 50-85 percent of tetrafluoroethylene polymerization unit, 5-49 percent of the polymerization unit of the two types of short side-radical sulfonyl fluoride vinyl ether provided with different structures, and1-10 percent of bromine side-radical vinyl ether polymerization unit. A perfluorinated ion exchange membrane prepared by the resin not only has resistance to various chemical reagents, but also has high ion exchange capacity, electric conductivity, mechanical strength and dimensional stability, low membrane resistance and long service life, and is suitable for usage in fuel cells or high-temperature fuel cells. The invention also provides a preparation method and applications of the resin.

The invention provides a high exchange capacity perfluorinated resin of two types of short side-radical sulfonyl fluoride with different structures and cyan side-radical. The resin is a polyprotonic copolymer comprising the following components in total molar fraction: 50-85 percent of tetrafluoroethylene polymerization unit, 5-49 percent of the polymerization unit of the two types of short side-radical sulfonyl fluoride vinyl ether with two different structures, and1-10 percent of cyan side-radical vinyl ether polymerization unit. A perfluorinated ion exchange membrane prepared by the resin not only has resistance to various chemical reagents, but also has high ion exchange capacity, electric conductivity, mechanical strength and dimensional stability, low membrane resistance and long service life, and is suitable for usage in fuel cells or high-temperature fuel cells. The invention also provides a preparation method and applications of the resin.

The invention discloses a polystyrene/polyvinylidene fluoride quaternary ammonium type anion exchange alloy film preparation method, which comprises the following steps: dissolving polyvinylidene fluoride firstly, uniformly mixing the polyvinylidene fluoride and a polymerized monomer solution containing styrene, a cross-linking agent and an initiator, and then heating for copolymerization, extruding, solidifying, granulating, drying, crushing and other steps for obtaining polystyrene/polyvinylidene fluoride alloy powder; obtaining a quaternary ammonium type anion exchange alloy powder by applying chloromethylation reaction and amination reaction to alloy powder finally using a hot pressing moulding method, adding auxiliary material, banburying, milling, pulling sheet, hot pressing, cooling and obtaining polystyrene/polyvinylidene fluoride quaternary ammonium type anion exchange alloy membrane. The quaternary ammonium type anion exchange alloy membrane prepared by the invention has the advantages of high-molecular interpenetrating network structure, which completely eliminates the structure defect that the anion exchange resin powder and the high-molecular binder in the traditional interphase anion exchange membrane are not compatible with low resistor.

A perfluoro-ion exchange membrane for electrolysis is prepared from the perfluoro-ion exchange resin containing sulfo and/or carboxy radicals through dissolving it in volatile solvent and program controlled coating of the solution on the template several times to form a multi-layer membrane containing the perfluoropolymer fibres as reinforcing material in at least one layer. Its advantages are low membrane resistance for high electric current efficiency and high mechanical strength and stability.

The invention belongs to the technical field of improvements on electrolysis equipment, and provides a method for improving a contact resistance reduction caused by a conductive contact means during zinc electrolysis. According to the method, the conventional single-sided contact is changed into the inter-groove copper-bar grooved contact, and the wedged double-sided contact is adopted for both electrode plates; and the grooved conductive copper bar and wedged conductive head design is converted from the original horizontal contact into the bevel contact. By adoption of the method, the technical problem that a lap conductive head is high in contact resistance, high in temperature, easy to oxidize and easy to deform during a conventional process of zinc electrodeposition based on wet zinc smelting can be solved; meanwhile, the total voltage of electrodeposition and the waste of electric energy can be reduced; and furthermore, the contact resistance can be greatly reduced, the easy cleaning operation and the low dirt adhesion possibility can be achieved, and the electric energy consumption can be greatly reduced.

The invention discloses a method for preparing a mono-/multi-valent ion exchange membrane by membrane fouling and electrodialysis deposition. The method utilizes a phenomenon that an electrolyte in asolution performs fouling on an ion exchange membrane, and employs an electrodialysis process to foul the surface or interior of a to-be-modified ion exchange membrane by a target pollutant so as to enable the ion exchange membrane to have a mono-/multi-valent ion selective permeability, so that the mono-/multi-valent ion exchange membrane is obtained. According to the method of the invention, through chemical bond combination between the target pollutant and the ion exchange membrane main structure, the surface resistance is effectively reduced, the limiting current density under electrodialysis operating conditions is improved, and peeling of a modification compound from a membrane matrix is avoided during long-term operation. The method has a simple operation process, is easy to industrialize, has a wide range of raw materials, and has low cost in the membrane modification process.

The invention discloses a polystyrene/polystyrene anion exchange alloy film preparation method, which comprises the following steps: adding a polymerized monomer solution which is composed of 1-(chloromethyl)-4-ethenylbenzene, a cross-linking agent and an initiator into a polyvinylidene fluoride solution, and then heating for copolymerization, extruding, solidifying, granulating, drying, crushing and other steps for obtaining PCMS/polyvinylidene fluoride alloy powder; reacting the alloy powder and the amination solution, washing, transforming, drying and obtaining the anion exchange powder; finally using a hot pressing moulding method, adding auxiliary material, banburying, milling, pulling sheet, hot pressing and obtaining polyvinylidene fluoride/ polystyrene anion exchange alloy membrane. The anion exchange alloy membrane manufactured by the invention has the advantages of high-molecular interpenetrating network structure, whose membrane area resistance is greatly lower than the traditional interphase anion exchange membrane, and the comprehensive properties of the membrane approaches to the homogeneous anion exchange membrane. The invention avoids the usage of carcinogenic reagent chloromethyl ether, and is easy for realization of industrial production.

The invention discloses a diaphragm for electrochemical synthesis of dinitrogen pentoxide and a preparation method thereof. The diaphragm is compounded by a membrane formed by a porous polytetrafluoroethylene substrate membrane, a loaded highly-fluorinated ion exchange resin and SiO2, and an expanded polytetrafluoroethylene membrane, and has a thickness of 80-120 microns. The preparation process comprises the following steps: treating the porous polytetrafluoroethylene substrate membrane in concentrated nitric acid; loading the treated substrate membrane in a highly-fluorinated ion exchange resin solution, loading the substrate membrane loaded with highly-fluorinated ion exchange resin in SiO2 sol to obtain a porous polytetrafluoroethylene-highly-fluorinated ion exchange resin-SiO2 membrane, and pressing the membrane with an expanded polytetrafluoroethylene membrane to obtain a diaphragm for the electrochemical synthesis of dinitrogen pentoxide. The advantages of the invention are that: the diaphragm has the characteristics of low membrane resistance, high water-blocking performance, and high current efficiency; the preparation condition is mild; the production cost is low; and the preparation method facilitates industrialization.

Provided is an ion-exchange membrane for alkali chloride electrolysis which has increased membrane strength and reduced membrane resistance, thereby reducing the electrolysis voltage for alkali chloride electrolysis. In this ion-exchange membrane (1) for alkali chloride electrolysis, a reinforcing material (20) formed by weaving reinforcing threads (22) and sacrificial threads (24) is disposed in a layer (S) (14), and layer (S) (14) comprises elution parts (28) which are formed by elution of at least portions of the sacrificial threads (24). In a cross section perpendicular to the warp threads of the reinforcing threads, the average distance (d1) from the center of a reinforcing thread (22) to the center of an adjacent reinforcing thread (22), the total area (P) obtained by adding the cross-sectional areas of the elution parts (28) and the cross-sectional areas of the remaining sacrificial threads (24) in the elution parts (28), the number (n) of elution parts between adjacent reinforcing threads (22), and the ion exchange capacity of a layer (Sa) in layer (S) (14) closest to the positive electrode side upon alkali chloride electrolysis are controlled within specific ranges.

The invention relates to a diaphragm for a flow battery and a preparation method thereof. The diaphragm is filmed by perfluorinated resin; at least one of the two surfaces of the perfluorinated resin film is provided with an imide or sulfimide condensation polymer modification layer; and the modification layer is formed from intermolecular condensation reaction between two varieties of fluorocarbon chain double functional group substances. The surface modified perfluorinated ion exchange membrane can be used as a diaphragm for a vanadium flow battery and overcome defects of high permeability of vanadium ion and huge water mobility of a Nafion ion exchange membrane; meanwhile, the diaphragm has excellent chemical stability and long service life in the battery. The invention also provides the preparation method of the diaphragm for the flow battery.

The invention discloses the application of a mixed cellulose ester film, a prepared battery and a preparation method. The film shows very excellent electrochemical performance as a diaphragm of an aqueous zinc-ion battery. And under the large current density of 5A g<-1>, the capacity retention ratio is still as high as 91.8% after circulation for 4000 circles, and the coulombic efficiency is closeto 100%. The novel diaphragm provided by the invention can greatly prolong the cycle life of the aqueous zinc-ion battery and improve the cycle stability of the aqueous zinc-ion battery, and is beneficial to promoting the development and application of the aqueous zinc-ion battery.

The invention provides a perfluorinated ion exchange resin and a preparation method thereof. The perfluorinated ion exchange resin has a structure shown in a formula (I). The preparation method of the perfluorinated ion exchange resin comprises the following step: performing complete or partial grafting reaction on a precursor resin and a functional monomer under certain conditions. The perfluorinated ion exchange resin synthesized by the invention can simultaneously meet the requirements for high ion exchange capacity and large mechanical strength, and has wide applicability; and by regulating the ratio of the functional monomer in the raw materials, perfluorinated ion exchange resins which have different ion exchange capacities and mechanical properties to meet various requirements can be prepared.

The invention discloses a heating element based on a thermo-electronic film and a preparation method thereof. The preparation method comprises the following steps that 1, SnCl4.5H2O is added into a mixed solution of ethyl alcohol and deionized water, heating and stirring are conducted till the SnCl4. 5H2O is fully dissolved, antimony trichloride, bismuth trichloride and titanium tetrachloride areadded and stirred to be uniform, and an electric heating film solution is obtained; 2, the preheated tubular base body is placed in a high-temperature furnace, vaporous electrothermal film liquid is introduced into the high-temperature furnace, the vaporous electrothermal film liquid is deposited on the surface of the tubular base body, heat preservation is conducted, then natural cooling is conducted, and an electrothermal film layer is obtained; wherein the tubular base body rotates around the central axis of the tubular base body in the high-temperature furnace; and 3, manganese dioxide, nickel sesquioxide, cobalt sesquioxide and chromium oxide are mixed, and the mixture is sprayed on the outer side of the electrothermal film layer to obtain the infrared emission film layer.

The invention provides a hydrophilic fluorinated polymer with a sulphonate side group, which is prepared by performing multi-component copolymerization on tetrafluoroethylene and two types of sulphonate side group vinyl ether monomers with different structures. A perfluorinated ion exchange membrane prepared by the assistance of the fluorinated polymer not only has resistance to various chemical mediums, but also has high electrical conductivity, high mechanical intensity, high size stability, low membrane resistance and long service life, and is suitable to be used in a fuel cell or a chlorine-alkali electrolytic cell. The invention also provides a preparation method and application of the hydrophilic fluorinated polymer.

The invention belongs to the technical field of ion exchange membranes, and particularly relates to an ultrathin perfluorosulfonic acid ion exchange membrane for alkali metal chloride electrolysis, and a preparation method thereof. The ultrathin perfluorosulfonic acid ion exchange membrane comprises a perfluorosulfonic acid polymer layer, wherein the surface of the perfluorosulfonic acid polymer layer is coated with a functional surface coating, the functional surface coating is composed of a perfluoropolymer and has a porous rough structure, and a porous non-woven polymer layer is embedded inthe perfluorosulfonic acid polymer layer. According to the invention, an ultrathin porous non-woven polymer is used as a reinforcing material, so that the membrane has good mechanical properties andlow membrane resistance; by adopting a perfluorosulfonic acid polymer with ion conduction function, the surface roughness of the membrane can be improved so as to improve the anti-foaming performanceof the membrane, so that the membrane is suitable for running in a zero-polar-distance electrolytic cell under a novel high-current-density condition, and the cell voltage can be remarkably reduced; and the preparation method provided by the invention is simple and reasonable in process and easy for industrial production.

The invention belongs to the technical field of ion exchange membranes, and particularly relates to a reinforced perfluorocarboxylic acid ion exchange membrane with a bubble dredging function and a preparation method thereof. The reinforced perfluorocarboxylic acid ion exchange membrane with the bubble thinning function is composed of a perfluorocarboxylic acid polymer layer, a porous reinforcingmaterial layer and functional surface coatings, the functional surface coatings are located on the upper surface and the lower surface of the perfluorocarboxylic acid polymer layer, the porous reinforcing material layer is embedded in the perfluorocarboxylic acid polymer layer, and the functional surface coating is of a porous rough structure composed of a perfluorinated ionic polymer. The reinforced perfluorocarboxylic acid ion exchange membrane with the bubble thinning function can effectively reduce the cell voltage, reduce the electrolysis energy consumption and reduce the production costin a novel zero-polar-distance electrolytic cell under the condition of high current density, and is suitable for the field of electrolysis of sodium chloride and potassium chloride; the invention also provides a preparation method thereof.

Provided is an ion exchange membrane for alkali chloride electrolysis, the ion exchange membrane exhibiting low membrane resistance and reducing the electrolysis voltage during alkali chloride electrolysis, even when the space between reinforcing fibers is narrow and membrane strength is high. This ion exchange membrane 1 for alkali chloride electrolysis has: a fluorine-based polymer that contains ion exchange groups; a reinforcing material formed from reinforcing fibers embedded within the fluorine based polymer, and optionally included sacrificial fibers; and elution holes for the sacrificial fibers present between the reinforcing fibers. In a cross-section orthogonal to the lengthwise direction of the reinforcing fibers forming the reinforcing material, the average distance (d1) from the center of a reinforcing fiber 22 to the center of a neighboring reinforcing fiber 22 is 750-1,000 [Mu]m, the total area (S) calculated by adding the cross-sectional area of an elution hole 28 and the cross-sectional area of sacrificial fiber 24 remaining in the elution hole 28 is 500-5,000 [Mu]m2 per elution hole, and the number n of elution holes 28 between neighboring reinforcing fibers 22 is 4-6.