Charge-modified microfiber filter sheets

Details Charge-modified microfiber filter sheets Charge-modified microfiber filter sheets

1985-03-28

1988-03-29

Wyse, Tom

Liquid purification or separation

Processes

Separating

210504, 210505, 210509, B01D 1300

Patent

active

047342080

ABSTRACT:
Filter media comprised of charge modified, resin coated inorganic microfibers are prepared by mixing inorganic microfibers with an aqueous solution of a water soluble, noncolloidal cationic thermosetting binder resin to form a dispersion, following which a precipitating agent is added to precipitate the binder resin and coat the microfibers. The coated microfibers may be used in the dispersed or suspended form as a filter aid. Preferably they are formed into a filter sheet which is then dried and cured to form a filter sheet of narrowly distributed pore size, pore sizes as small as one-half micron, and having a positive zeta potential in alkaline media. Glass is the preferred microfiber and polyamine-epichlorohydrins the preferred resins. By providing the normally negative zeta potential microfibers with a positive zeta potential the binder resins used to coat the microfibers substantially enhance particulate removal capabilities of the microfiber filter sheet.

REFERENCES:
patent: 4617128 (1980-10-01), Ostreicher
patent: 4645567 (1987-02-01), Hou et al.

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