KOMPOSITMEMBRAN

• Main Authors: TOMATSU, Jin, OHASHI, Hidenori, NANBU, Mami, OSHIBA, Yuhei, FURUYA, Koji, OHNO, Takao, YAMAGUCHI, Takeo
• Format: Patent
• Language: Danish
• Published: 31.10.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SEPARATION; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

To provide a substrate for a composite membrane comprising a microporous polyolefin membrane the pores of which can be satisfactorily loaded with a hydrophilic resin compound and which has favorable permeability to an aqueous solution with a high water concentration and a comparatively high surface free energy, without hydrophilization pretreatment being carried out thereon.A substrate for a composite membrane comprising a microporous polyolefin membrane for carrying a hydrophilic resin compound within the pores of the microporous membrane wherein: the average pore diameter is 1 nm to 50 nm; the porosity is 50% to 78%; the membrane thickness is 1 µm to 12 µm; and, when a mixed solution of ethanol and water (volume ratio 1/2) is dripped onto a surface of the microporous polyolefin membrane which has not undergone hydrophilization treatment, the contact angle θ1 between the droplet and the surface is 0 to 90 degrees 1 second after the dripping, and the contact angle θ2 between the droplet and the surface is 0 to 70 degrees 10 minutes after the dripping, and the rate of change of the contact angle ((θ1-θ2)/θ1 × 100) is 10 to 50%.