| 摘要 |
PURPOSE:To form uniform sepn. function films on the surfaces and porous gap parts of hollow yarn and to improve permeability without impairing separability, by executing coating of a film forming material while injecting liquid into the porous hollow yarn. CONSTITUTION:The film forming material is continuousy coated by using a soln. (-15wt.%) of, for example, polysiloxane, poly(trimethyl vinylsilane), etc., in the inside of the porous hollow yarn consisting of PE, PTFE, etc., under pouring of a liquid (e.g. pour water) with which the film forming material is insoluble or hardly soluble, in a process for producing the sepn. function hollow yarn particularly useful for sepn. and pervaporation. The sepn. function films are thereby uniformly formed only in the surface part or porous gap parts of the hollow yarn without infiltrating the coating liquid of the film forming material to the inside of the porous hollow yarn and the permeability is en hanced without impairing the separability. |
