{
  "$type": "site.standard.document",
  "description": "The invention is: a separation membrane for a redox flow battery, obtained by forming a protective film on a sheet substrate that has a large number of voids communicating between front and rear, and bonding to the protective film an ion-exchange membrane obtained by causing an inorganic porous…",
  "path": "/patents/1408284",
  "publishedAt": "2024-08-14T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "C01B33/40",
    "YAMADA OHKI [JP]"
  ],
  "textContent": "The invention is: a separation membrane for a redox flow battery, obtained by forming a protective film on a sheet substrate that has a large number of voids communicating between front and rear, and bonding to the protective film an ion-exchange membrane obtained by causing an inorganic porous powdery/granular body, to which an ion-exchange resin obtained by sulfonating rosin has been attached, to be dispersed in a matrix constituted of ion-exchange resin; as well as a method of producing a separation membrane for a redox flow battery, the method comprising a step for forming a protective film on a sheet substrate, a step for attaching to the protective film a coating solution in which an inorganic porous powdery/granular body and a sulfonating agent are contained in a rosin solution obtained by mixing rosin and solvent, and a step for introducing a sulfonic acid group to the rosin to make an ion-exchange resin. The use of such an ion-exchange membrane for which rosin is the raw material makes it possible to achieve a separation membrane for a redox flow battery that can be stored dry, can be handled with ease, is particularly superior in preventing electrolyte leakage and in proton permeability, and also has a high tensile strength and high water pressure resistance.",
  "title": "SEPARATION MEMBRANE FOR REDOX FLOW BATTERY, AND METHOD OF PRODUCING SAID SEPARATION MEMBRANE"
}