Process for the preparation of composite semi-permeable membrane

Details Process for the preparation of composite semi-permeable membrane Process for the preparation of composite semi-permeable membrane

1994-12-19

1997-01-14

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Pretreatment of substrate or post-treatment of coated substrate

427209, 427322, 427421, 427538, 427569, C23C 1402

Patent

active

055937381

ABSTRACT:
There is provided a process for the preparation of composite semi-permeable membrane superior in selectivity and permeability, capable of improving bonding strength between a porous support layer and a reinforcement and mechanical strength of semi-permeable membrane.
The composite semi-permeable membrane is prepared by subjecting woven fabric or non-woven fabric to corona discharge with a discharge power of approximately 10 to approximately 15 watt for a period of approximately 20 to approximately 40 seconds, spraying water over one surface of the fabric, casting porous support substance on the other surface of the fabric when a time of approximately 5 to approximately 10 seconds has elapsed after the spray, and laminating a crosslinked polyamide ultrathin film on the porous support substance, the polyamide ultrathin film being synthesized by interfacial polycondensation of a multifunctional amine solution and a multifunctional halogen solution.

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