Process for the preparation of composite semi-permeable membrane
US5593738A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1994 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Dec 19, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D69/1251
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.