LIQUID COMPOSITION COATING LIQUID FOR FORMING CATALYST LAYER AND METHOD FOR PRODUCING MEMBRANE ELECTRODE ASSEMBLY

• Main Authors: WATABE HIROYUKI, HOMMURA SATORU, TANUMA TOSHIHIRO
• Format: Patent
• Language: English; Korean
• Published: 03.05.2018
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; ELECTRICITY; FILLING PASTES; GENERAL PROCESSES OF COMPOUNDING; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS; WORKING-UP

고체 고분자 전해질막 또는 촉매층을 형성할 때에 균열을 잘 발생시키지 않게 할 수 있는, 액상 조성물, 촉매층 형성용 도공액 및 막 전극 접합체의 제조 방법의 제공. -[CF-CF{(OCFCFX)O(CF)SOH}]- (단, X：F 또는 CF, m：1 ∼ 3, p：0 또는 1, n：1 ∼ 12 의 정수이다) 로 나타내는 구성 단위와 테트라플루오로에틸렌에서 유래하는 구성 단위를 갖는 공중합체를, 물과 탄화수소계 알코올을 함유하는 매체 (단, 함불소 용매를 함유하지 않는다) 에 분산시켜, 상기 공중합체의 농도가 13 ∼ 26 질량％ 인 분산액을 조제하고, 상기 분산액 및 함불소 용매를, 상기 공중합체의 농도와 상기 함불소 용매의 농도의 합계가 17 ∼ 35 질량％ 가 되도록 혼합하여 액상 조성물을 조제한다. To provide methods for producing a liquid composition, a coating liquid for a catalyst layer and a membrane electrode assembly, capable of making cracking less likely to occur at the time of forming a solid polymer electrolyte membrane or a catalyst layer. A copolymer having a structural unit represented by -[CF 2 -CF{(OCF 2 CFX) m O n (CF 2 ) n SO 3 H}]- (wherein X: F or CF 3 , m: 1 to 3, p: 0 or 1, and n: an integer of 1 to 12) and a structural unit derived from tetrafluoroethylene, is dispersed in a medium containing water and a hydrocarbon-type alcohol (but not including a fluorinated solvent) to prepare a dispersion wherein the concentration of the copolymer is from 13 to 26 mass%, and the dispersion and a fluorinated solvent are mixed so that the sum of the concentration of the copolymer and the concentration of the fluorinated solvent becomes to be from 17 to 35 mass%, to prepare a liquid composition.