Patent ID: 11925905
Assignee: BEIJING BAOSHENGTONG INTERNATIONAL ELECTRIC ENGINEERING TECHNOLOGY CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  Y | IPC B

Claim 9:
10. The method of preparing for a forward osmosis membrane of claim 6, further comprising:
(b-1) defoaming or removing bubbles from the casting solution prepared in the step (b);
the step (c) further including: coating the casting solution removed bubbles which prepared by step (b-1) on the surface of the glass plate covered by the modified antibacterial hydrophilic support mesh, using a film scraper machine to scrap to form the initial forward osmosis membrane with a certain thickness;
the treatment of the external layer and removal solvent in the step (d), including standing the initial forward osmosis membrane in the air to make the solvent volatilize and form the dense skin layer on the external layer;
in the step (e), through immersing the second initial forward osmosis membrane into a deionized water to make it gel and split phase to form a membrane;
(f) immersing the forward osmosis membrane obtained by step (e) into a deionized water to remove the residual organic solvent;
(g) taking out the forward osmosis membrane and rising it with a deionized water, and then saving it in a sodium metabisulfite solution for later use.