Method of making a reverse osmosis semipermeable membrane

Details Method of making a reverse osmosis semipermeable membrane Method of making a reverse osmosis semipermeable membrane

1984-02-01

1985-12-10

Lawrence, Evan K.

Coating processes

Foraminous product produced

Filter, sponge, or foam

2105002, 427245, 427386, 4273899, 427391, 4273935, B05D 500, B05D 302

Patent

active

045579490

ABSTRACT:
A method of producing a semipermeable membrane comprising a polymeric material based upon a trisisocyanurate structure ##STR1## wherein, R.sub.1, R.sub.2 and R.sub.3 are hydrogen or alkyl radicals containing from 2 to 5 carbon atoms, and at least two of R.sub.1, R.sub.2 and R.sub.3 are alkyl radicals having hydroxyl or glycidyl groups. The membrane has high solute rejection, high flux, excellent high pressure resistance, and high temperature resistance and is a highly useful composite membrane for reverse osmosis. In the method, an aqueous solution containing, for example, a reaction product of Formula I is applied to the surface of a porous substrate and is heated at a temperature of about 100.degree. C. to 190.degree. C. to provide a cross-linked structure including a multiplicity of isocyanurate groups on the porous substrate.

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