Reverse osmosis membrane is to achieve the core component of reverse osmosis, is a simulated biological semipermeable membrane made with certain characteristics of the artificial semipermeable membrane.
General use of polymer materials. Such as a cellulose acetate film, an aromatic polyamide film, and an aromatic polyamide film. Surface pore diameter is generally between 0.5 ~ 10nm, the size of the membrane permeability and its chemical structure. Some polymer materials to the exclusion of salt, and water transmission rate is not good. Some polymer chemical structure with more hydrophilic groups, and thus the water transmission rate is relatively fast. So a satisfactory reverse osmosis membrane should have the appropriate penetration or desalination rate.
According to desalination needs, through a large number of research and experiment, from a large number of polymer materials in the cellulose acetate (CA) and aromatic polyamide two categories of membrane material. In addition, the composite membrane of the skin layer also used some other special materials.
