Hydrophilizing agent for hydrophobic porous membrane, and method for hydrophilizing hydrophobic porous membrane and test method using this agent
AssigneeMitsubishi Rayon Co., Ltd.
InventorsNoritaka Shibata, Makoto Ideguchi, Wataru Fujii
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Abstract
A hydrophilizing agent for a hydrophobic porous membrane, wherein the agent contains a surfactant, and the surfactant has a frothability such that the bubble height immediately after frothing, as measured according to the Ross-Miles method (JIS K 3362), using a 0.1 wt % aqueous solution of the surfactant at 25° C., is 40 mm or less, and preferably has a frothability such that the bubble height five minutes after frothing is 20 mm or less; a method for hydrophilizing a hydrophobic porous membrane using this hydrophilizing agent; and a method for testing and hydrophilizing a membrane module using this hydrophilizing agent.
Claims7
A method for hydrophilizing a hydrophobic porous membrane, comprising a step of bringing a hydrophobic porous membrane into contact with the hydrophilizing agent for a hydrophobic porous membrane, wherein the agent contains ethoxylated acetylene glycol based surfactant having a static surface tension in the range of 20-28 mN/m in a 0.1% aqueous solution, and the surfactant has a frothability such that the bubble heigh immediately after frothing, as measured according to the Ross-Miles method (JIS K 3362), using a 0.1 wt. % aqueous solution of the surfactant at 25° C., is 40 mm or less.
Dependencies are inferred from the claim text.