1090results about "Organic diaphragms" patented technology

The invention provides a novel polynorbornene anion exchange ionomer containing a polar functional group as well as a preparation method and application of the novel polynorbornene anion exchange ionomer. The polynorbornene has excellent thermal stability and chemical stability. Meanwhile, the AEI main chain of the polynorbornene has no aryl group, so that the adsorption influence caused by the aryl group is avoided. The synthesized addition polynorbornene AEI in the form of quaternary ammonium salt can be dissolved in a low-boiling-point solvent, and it is ensured that a membrane electrode can be prepared through a solvent casting method. Besides the solubility of the AEI, the addition polynorbornene-based AEI in the form of quaternary ammonium salt is modified by utilizing a thiol-ene click reaction, an anion exchange ionomer containing a polar functional group can be prepared, the interaction between the AEI and an electrolytic catalyst is improved, the reaction is simple and easy to operate, the universality is high, and the method is suitable for industrial production. And the current density in the AEMWE system containing the AEI can be effectively improved.

The invention belongs to the field of proton exchange membrane water electrolysis hydrogen production, and particularly relates to a functionalized ionic liquid modified PVDF / Nafion composite proton exchange membrane as well as a preparation method and application thereof, which are used for solving the technical problems of high cost, low mechanical strength, swelling at high temperature and low conductivity of a Nafion composite membrane. A PVDF / Nafion solution is subjected to functionalized ionic liquid modification to obtain a membrane casting solution, and then the membrane casting solution is coated and dried to obtain the functionalized ionic liquid modified PVDF / Nafion composite proton exchange membrane. According to the ionic liquid modified PVDF / Nafion composite proton exchange membrane disclosed by the invention, the usage amount of Nafion resin is reduced, the cost is reduced, and meanwhile, the proton conductivity is improved by adding the ionic liquid; the ionic liquid functionalized by different cations can form a hydrogen bond network with sulfonic acid groups of Nafion and fluorine atoms of PVDF, so that the mechanical property and the thermal stability of the proton exchange membrane are improved, and the proton exchange membrane has a good application prospect.

A bipolar membrane in which a cation-exchange membrane and an anion-exchange membrane are joined to each other, wherein a leakage ratio of gluconic acid at 60° C. is not more than 1.0%, and the cation-exchange membrane is supported by a polyolefin reinforcing member and, further, contains a polyvinyl chloride.

The present disclosure provides a dispersion-cast ion-conducting membrane for a proton exchange membrane water electrolyser, the membrane comprising a dispersion cast ion- conducting polymer layer which layer comprises an ion-conducting polymer, the ion- conducting polymer layer having a maximum burst strength of greater than or equal to 10.5 MPa.

The invention relates to the technical field of diaphragms, in particular to an alkaline electrolyzed water porous diaphragm and a preparation method and application thereof.The preparation method comprises the following steps that engineering thermoplastic resin and a diluent are mixed in a nitrogen atmosphere in a sealed mode to obtain a mixed solution, and then the mixed solution is heated to obtain a membrane casting solution; the membrane casting solution is cast on a glass plate at the temperature of 200-350 DEG C, the casting thickness of the membrane casting solution on the glass plate is controlled to be 100-500 microns, then the glass plate where the membrane casting solution is cast is placed at the room temperature to be cooled and then placed in cooling water to be cooled again, so that the membrane casting solution is solidified on the glass plate to form a membrane, and the glass plate and the membrane are separated to obtain an alkaline electrolytic water liquid membrane; and immersing the alkaline electrolyzed water liquid membrane into heated acetone to extract the diluent, thereby obtaining the alkaline electrolyzed water porous diaphragm. The diaphragm prepared by the preparation method of the alkaline electrolyzed water porous diaphragm has relatively low ion impedance and relatively high mechanical strength and alkali resistance.

To provide an ion conductive polymer having improved ion conductivity, and a separation membrane containing the same.SOLUTION: The present disclosure relates to an ion-conducting polymer having a repeat unit comprising a quaternary ammonium and at least one ether group.SELECTED DRAWING: None

Proton exchange membranes are described. The proton exchange membrane includes: a reinforcing membrane; a continuous non-porous hydrogen recombination catalyst coating, the continuous non-porous hydrogen recombination catalyst coating comprising a mixture of a hydrogen recombination catalyst and a proton conducting ionomer; and a continuous non-porous cross-linked polyelectrolyte multilayer coating, the continuous non-porous cross-linked polyelectrolyte multilayer coating comprising alternating layers of a polycationic polymer and a polyanionic polymer. Catalyst coated membranes incorporating proton exchange membranes and methods of making proton exchange membranes are also described.

Provided is a versatile nonwoven fabric having excellent heat resistance and mechanical strength and applicable to applications requiring heat resistance; or a nonwoven fabric having excellent heat resistance, mechanical strength, and permeability. Moreover, provided is a separator for electrochemical elements having excellent heat resistance and mechanical strength. Furthermore, provided is a membrane support having excellent heat resistance, mechanical strength, and ion permeability.The nonwoven fabric of the present invention comprises a polymethylpentene component and a polyethylene component, wherein the polyethylene component is fused, and wherein the polymethylpentene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, and the polyethylene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric. The separator for electrochemical elements of the present invention comprises the nonwoven fabric. Another nonwoven fabric of the present invention comprises core-sheath composite fibers having a polyethylene component as a sheath component and a polymethylpentene component as a core component, wherein the polyethylene component as the sheath component of the core-sheath composite fiber is fused, wherein the polymethylpentene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, and the polyethylene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, wherein a thickness of the nonwoven fabric is 100 μm or less, and the nonwoven fabric has a direction with a tensile strength per mass per unit area of 2.0 N / 5 cm-width or more, or wherein a ratio (L / D) of a fiber diameter (D, unit: μm) to a length (L, unit: μm) of the core-sheath composite fiber is 350 or more. The membrane support of the present invention comprises the other nonwoven fabric.

A method for the production of an ion-conducting membrane for a water electrolyser or a fuel cell is provided. The method comprises the step of mixing a first liquid stream comprising an ion-conducting polymer and a second liquid stream comprising a cerium-containing compound in-line to form a coating composition. The coating composition is then deposited onto a substrate to form a membrane layer. An apparatus for the production of an ion-conducting membrane for a water electrolyser or a fuel cell is also provided.

The invention belongs to the technical field of water electrolysis hydrogen production, and discloses a branched polyaromatic piperidine anion exchange membrane, a preparation method and application. The preparation method comprises the following steps: preparing a branched polymer precursor, preparing a quaternized branched polymer, and preparing the branched anion exchange membrane: dissolving the quaternized branched polymer in a third solvent, and drying in a vacuum drying oven to obtain the branched anion exchange membrane in the form of iodide ions, and soaking the branched anion-exchange membrane in the form of iodide ions in a NaOH solution for ion exchange, so that the branched anion-exchange membrane in the form of iodide ions is completely converted into a form of hydroxyl ions. According to the invention, ether-free skeleton polyaromatic hydrocarbon is selected as a main chain and has the characteristic of strong alkali-resistant stability, six-membered nitrogen heterocyclic ions are adopted as functional groups, and a large steric hindrance structure can hinder nucleophilic substitution and elimination reaction, so that the alkali-resistant stability of the anion exchange membrane is improved, and the service life of the anion exchange membrane is prolonged.

This biaxially oriented polyarylene sulfide film contains a polyarylene sulfide resin as a main constituent component. The biaxially oriented polyarylene sulfide film has a thickness variation in the film width direction of 0.5% to 10.0% inclusive in a width of 300 mm around the central part in the width direction of the film, an orientation angle from the film longitudinal direction of more than -35° but less than 35°, not less than -90° but less than -55°, or more than 55° but not more than 90°, and a difference between the maximum value and the minimum value of the orientation angle of 0.5° to 20.0° inclusive. The present invention provides a biaxially oriented polyarylene sulfide film which is capable of suppressing warpage at the time of processing, and is excellent in terms of pressure uniformity when a large number of the biaxially oriented polyarylene sulfide films are stacked and pressurized.

The invention discloses an anion exchange membrane electrode and a preparation method and application thereof, and belongs to the technical field of new energy material and catalytic electrode preparation, the method comprises the following steps: S1, preparing an anode catalyst slurry comprising a hydrophobic covalent organic framework material, an anode catalyst, an anion exchange ionomer and a solvent; s2, preparing a cathode catalyst slurry of which the components comprise a cathode catalyst, an anion exchange ionomer and a solvent; and S3, respectively spraying or coating the anode catalyst slurry and the cathode catalyst slurry on two side surfaces of an anion exchange membrane or a gas diffusion layer, and carrying out heat treatment to obtain the anion exchange membrane electrode. The method provided by the invention can solve the problems of large gas-liquid-ion three-phase mass transfer resistance, easy shielding of active catalytic sites by ionomers and unbalanced water management in the membrane electrode assembly in the existing AEMWE device.

The invention discloses a paper-based diaphragm for alkaline water electrolysis and a preparation method of the paper-based diaphragm. A PPS / aramid fiber porous base material is prepared by adopting a wet non-woven process, a PVA-polymer quaternary ammonium salt blending layer is constructed on one side of the base material, OH <-> conduction is promoted by utilizing a quaternary ammonium group of polymer quaternary ammonium salt, and a three-dimensional network is formed through glutaraldehyde crosslinking. According to the paper-based diaphragm prepared through the method, when the porosity is 60.4%, the strength still reaches 8.98 MPa, the surface resistance of the diaphragm is greatly reduced to 68 m omega.cm < 2 >, the ionic conductivity synchronously jumps to 515 mS.cm <-1 >, the electrolytic current density is promoted to reach 1474 mA under the polarization voltage of 2.0 V, the vertical swelling rate of the diaphragm is stabilized at 12% through the cross-linked functional layer, and the paper-based diaphragm has the advantages that the paper-based diaphragm can be applied to the field of lithium ion batteries. The diaphragm achieves an optimal balance in key indexes such as aperture, strength, ionic conductivity and alkali liquor stability.

A catalyst coated separator (1) for alkaline water electrolysis comprising a porous support (100) and, in order on at least one side of the support:-an optional porous polymer layer (200),-an alkali-stable non-porous polymer layer (300), and-a catalyst layer (400).

The present invention relates to an electrode for electrolysis, a laminate, a wound body, an electrolyzer, a method for producing an electrolyzer, a method for renewing an electrode, a method for renewing a laminate, and a method for producing a wound body. An electrode for electrolysis according to one aspect of the present invention has a mass per unit area of 48 mg / cm2 or less and a force applied per unit mass-unit area of 0.08 N / mg·cm2 or more.

The present application relates to a composite diaphragm, and a preparation method therefor and the use thereof. The composite diaphragm comprises a three-dimensional porous support layer and a membrane material, wherein pores of the three-dimensional porous support layer are filled with the membrane material; the three-dimensional porous support layer comprises fiber filaments and / or a fiber cloth, and the fiber filaments and / or fiber filaments constituting the fiber cloth are hydrophilic fiber filaments and / or roughened fiber filaments. The composite diaphragm forms an elastic collapse-resistant support framework by means of multi-layer stacking, interweaving and winding of the fiber filaments, which improves the compression strength of the diaphragm; the treated fiber filaments can increase their contact with a casting solution, and the casting solution and the fiber network are interactively filled, which increases the contact volume between a liquid membrane and a phase separation non-solvent and delays the phase separation process during solidification so as to form a uniform sponge microporous dense structure, such that the formation of large finger-shaped through holes is inhibited, thereby facilitating the blocking of gas passage and improvement to the chemical stability. The casting solution is uniformly distributed in the fiber framework, and the membrane material is firmly anchored by the three-dimensional fiber network after solidification, such that the mechanical stability of the diaphragm is improved.

Composite anion exchange membranes are described. The composite anion exchange membranes comprise an anion exchange polymer containing a hydrogen recombination catalyst dispersed in the anion exchange polymer. The anion exchange membrane may also include a radical scavenger. The anion exchange polymer comprises a plurality of repeating units of formula (I)Catalyst coated membranes and membrane electrode assemblies made using the composite anion exchange membranes are also described.

The present invention relates to the technical field of the electrolysis of water, and specifically relates to a low-hydrogen-permeability proton exchange membrane, and a preparation method therefor and the use thereof. The proton exchange membrane comprises a Pt-containing additive layer and a matrix membrane, wherein the Pt-containing additive layer is composed of a Pt additive and a fluorine-containing proton exchange resin, the Pt-containing additive layer comprises an array layer and a flattening layer, the thickness ratio and the active-component ratio of the array layer to the flattening layer are respectively within the ranges of 1:(0.5-30) and 1:(1-50), and the array layer is composed of arrays arranged in order and an array layer resin coating the arrays. In the low-hydrogen-permeability proton exchange membrane provided by the present invention, by providing the Pt-containing additive layer consisting of the array layer and the flattening layer, the specific surface area of the Pt-containing additive layer is effectively increased by means of the arrays in the array layer, thereby achieving the efficient utilization of an additive; moreover, the hydrogen permeability improvement effect is further improved by controlling the thickness ratio and the active-component ratio of the array layer to the flattening layer and the parameters of the arrays.

The invention relates to the technical field of diaphragm preparation, in particular to a preparation method of an alkaline electrolyzed water diaphragm based on non-amphoteric hydroxide. The composite alkaline electrolytic water diaphragm is prepared by selecting Fe (OH) 3, Ni (OH) 2, Mg (OH) 2 and Al (OH) 3 as inorganic fillers, and the mass ratio of the inorganic fillers to PSF to PVP is 4: 3: 2. Compared with the prior art, the method has the advantages that the content of the organic filler in the diaphragm is reduced, the chemical stability of the diaphragm is favorably improved, the operation is simple and convenient, the cost is low, the yield is high, and the diaphragm has the characteristics of low surface resistance and high air tightness.

Provided are: an ion exchange membrane which has low membrane resistance and strong toughness that does not easily cause breakage of the membrane even when assembled in a water electrolysis device; a polyolefin-based porous membrane that can be used as a support for the ion exchange membrane; and a method for producing the polyolefin-based porous membrane. An ion exchange membrane which comprises a porous support and an ion exchange resin filled in the voids of the porous support, and which has a tear strength of 3.5 N or more in each of the MD direction and the TD direction.

The present invention relates to the field of cationic polymers, and in particular, to highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers and preparation methods and applications. The preparation method for the highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers includes the following steps: performing catalytic polycondensation on 1-R6-piperidine-3-carboxaldehyde or a salt or hydrate thereof and an aromatic compound to obtain a polymer having a piperidine moiety; and then further subjecting the polymer to a quaternization reaction to obtain the poly(arylene alkylene piperidinium) cationic polymer. The anion exchange membranes prepared from the piperidinium-based cationic polymers have ultra-high alkaline stability and excellent mechanical properties and ionic conductivities, and can be applied to the fields of electrochemical energy conversion such as fuel cells, hydrogen production by water electrolysis, electrochemical reduction of carbon dioxide, flow batteries, and fields of separation such as electrodialysis and water treatment.

The invention belongs to the technical field of chemical equipment, and discloses an electrolytic water membrane electrode and a preparation method thereof.The preparation method comprises the steps that a catalyst is electrically deposited on the surface of a substrate material, and a self-supporting electrode is obtained; preparing a first anionic membrane solution and a second anionic membrane solution by utilizing the functionalized polyaryl piperidine polymer and a polar solvent; and spraying the first anionic membrane solution on the surface of the self-supporting electrode, drying for the first time, smearing the second anionic membrane solution again by adopting the coating method, and drying for the second time to obtain the cathode side or anode side electrolytic water membrane electrode. Through an in-situ coating technology, the surface of the self-supporting electrode is directly covered with the anionic membrane solution, the surface microstructure of the self-supporting electrode is uneven, the anionic membrane solution can permeate into the pores, the anionic membrane and the electrode are tightly combined, ion transmission at the electrode / membrane interface is remarkably improved, and the self-supporting electrode is more stable in performance. Therefore, the electrolytic bath performance of the membrane electrode assembly under the condition that pure water serves as electrolyte is improved.

The invention relates to the technical field of high polymer materials, and particularly provides a preparation method and application of an anion exchange membrane. The anion exchange membrane is prepared by the following steps: preparing a membrane from anion exchange resin which contains a repetitive structure unit and is shown in the formula (I), and then carrying out in-situ self-crosslinking induced by electron beam irradiation. The anion-exchange membrane is prepared by adopting an electron beam irradiation technology, so that irreversible damage to the performance of the anion-exchange membrane caused by high-temperature heat treatment can be effectively overcome; meanwhile, the electron beam irradiation can promote the cross-linking unit with low reaction activity to realize cross-linking reaction, so that the method has better universality; in addition, the irradiation dose can be accurately regulated and controlled, so that the anion exchange membrane prepared in batches has more excellent uniformity, and the requirement of large-scale production can be met.

The invention relates to an anion exchange membrane as well as a preparation method and application thereof, the anion exchange membrane comprises ionic liquid functionalized inorganic hydrophilic particles and an ionic liquid modified polymer, and the ionic liquid functionalized inorganic hydrophilic particles and the ionic liquid modified polymer have synergistic interaction; the prepared anion exchange membrane has excellent comprehensive properties such as intrinsic hydroxyl conductivity, alkali-resistant stability and mechanical strength, can enable an alkaline water electrolysis bath to operate efficiently and stably, and meets the application requirements in alkaline electrolyzed water.

The present invention relates to a highly dispersible organic-inorganic hybrid nanoparticle radical scavenger having excellent low elution characteristics and reversible regenerability and to an electrode composition comprising same, the highly dispersible organic-inorganic hybrid nanoparticle radical scavenger comprising nanoparticles in which an oxide of cerium (Ce) and silicon (Si) and an oxide of at least one metal (M) selected from transition metals and lanthanides are combined, wherein the nanoparticles have at least one functional group selected from an alkylsulfonic acid group and a fluoroalkylsulfonic acid group.

This separator is used in a zinc secondary battery. The separator comprises an inorganic compound in which pores are formed. The average pore diameter of the inorganic compound is at least 0.3 nm and at most 10 nm. When a liquid tank in which two tubes each having an inner diameter of 6 mm protrude upward, which is partitioned into two chambers by a separator having a diameter of 26 mm, and which is filled with a 6M KOH aqueous solution is used as a measurement device, the liquid permeation amount measured 168 hours after the liquid level difference of the tubes is set to 70 cm is at least 0.05 mL and at most 5 mL.

This separator comprises: a porous resin base material; and an inorganic compound filled into the resin base material and composed of titanium and at least one element selected from the group consisting of magnesium, aluminum, and yttrium. The composition ratio of titanium to the entire inorganic compound is at least 40 atm%. When a liquid tank in which two tubes each having an inner diameter of 6 mm protrude upward, which is partitioned into two chambers by a separator having a diameter of 26 mm, and which is filled with a 6M KOH aqueous solution is used as a measurement device, the liquid permeation amount measured 168 hours after the liquid level difference of the tubes is set to 70 cm is at least 0.05 mL and at most 5 mL.

To improve the mechanical strength of hydrocarbon-based electrolyte membranes. [Solution] An electrolyte membrane 10A comprising a porous membrane 1 and a hydrocarbon-based electrolyte polymer filled in the pores 2 of the porous membrane 1, wherein the porous membrane 1 is formed of a material containing a hydrocarbon-based resin, and the differential permeate flow rate distribution of the porous membrane 1 measured by the bubble point method has a peak in the pore diameter range of 0.01 to 1 μm.

Anion exchange polymers comprise a plurality of repeating units of formula (I). The polymer may be synthesized from a super acid catalyzed polyhydroxyalkylation reaction of monomers Ar1′, Ar2′, and X1′ to form a neutral precursor polymer followed by a Menshutkin reaction to convert the neutral precursor polymer to the anion exchange polymer.Anion exchange membranes and membrane electrode assemblies incorporating the anion exchange polymers are also described.

The application discloses a cross-linked polyaryl piperidine anion exchange membrane and a preparation method and application thereof, and relates to the technical field of anion exchange membranes. The anion exchange membrane takes polyaryl piperidine as a skeleton, introduces crown ether structure and a cross-linked network, and solves the technical problem that the balance between the hydroxyl ion conductivity and the dimensional stability is difficult in the existing anion exchange membrane. The anion exchange membrane comprises a specific structure of a repeating unit, is prepared through Friedel-Crafts superacid catalytic polymerization, Menshutkin reaction functionalization and Michael addition reaction cross-linking, and has excellent hydroxyl ion conductivity, dimensional stability, chemical stability and mechanical strength. The preparation method is simple in operation, fast in polymerization rate, and high in conversion rate, does not need to strictly control the temperature and oxygen of a reaction environment, is suitable for the field of water electrolysis hydrogen production, especially suitable for an anion exchange membrane water electrolysis system, and has a wide industrial application prospect.