Support sheet for liquid separation membrane and continuous preparation thereof

Abstract

PURPOSE:To prepare the support sheet of a reverse osmosis liquid separation membrance excellent in reinforcing effect, by a method wherein a membrane forming polymer solution is coated on one surface of a base fabric and a coagulating liquid is contacted with the coated surface and thereafter contacted with the uncoated surface thereof. CONSTITUTION:A base fabric 1 such as knitted fabric or a non-woven fabric comprising a polyamide or a polyester fiber is passed between a knife edge 2 and the support thereof and introduced into a coagulating liquid 5 through a space 9 to be taken up by a rotary drum 6. During this time, a solution 4 containing a polymer such as polysulfone or polysulfonamide is coated on the base fabric at the nip of the knife edge 2 and the support thereof and the speed of the base fabric is regulated so as to impregnate the base fabric 1 with the solution 4 during a time when the base fabric 1 is passed through the space 9. In the next stage, the base fabric 1 is conveyed through the coagulating liquid 5 so as to contact the one surface thereof with a smooth flat plate 7 in said coagulating liquid 5 to selectively coagulate from the coated surface side liquid 5 and support sheet of a reverse osmosis liquid separation membrane consisting of a microporous polymer membrane of which theaverage pore size is 50Angstrom -50mu and the void ratio is 50-90% and a support sheet can be prepared.

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    EP-0497334-A1August 05, 1992E.I. Du Pont De Nemours And CompanyFixed plate casting system
    JP-2005054120-AMarch 03, 2005Toyobo Co Ltd, 東洋紡績株式会社多孔膜、その製造方法及び装置
    JP-2008214462-ASeptember 18, 2008Honda Motor Co Ltd, 本田技研工業株式会社複合多孔質膜及びその製造方法
    JP-2009233666-AOctober 15, 2009Toray Ind Inc, 東レ株式会社Separation membrane
    JP-4502070-B2July 14, 2010東レ株式会社分離膜
    JP-4604469-B2January 05, 2011東洋紡績株式会社多孔膜、その製造方法及び装置
    JP-H0451210-B2August 18, 1992Daicel Chem
    JP-S61146304-AJuly 04, 1986Daicel Chem Ind LtdSemipermeable membrane with supporting body
    JP-S62110986-AMay 22, 1987C Ren KkProduction of microporous fiber material having heat resistance and fire retardant property