Preparation method of polymeric membrane with single oil channel

The invention provides a preparation method of a polymeric membrane with a single oil channel, relates to a preparation method of a polymeric membrane with a single liquid channel and solves the problem about simple preparation of a polymeric membrane with a single oil channel characteristic. The preparation method comprises the following steps: (1) a hydrophobic polytetrafluoroethylene composite micro-filtration membrane is prepared for standby use; (2), dopamine hydrochloride is dissolved in a buffer solution with the pH ranging from 8.0 to 9.5, and a mixed solution is prepared; (3) the hydrophobic polytetrafluoroethylene composite micro-filtration membrane floats on the mixed solution with a selective layer upwards, left to stand for 6-48 h, washed with deionized water and dried until the weight of the hydrophobic polytetrafluoroethylene composite micro-filtration membrane is constant; (4) an adhesive tape is attached to the selective layer, the selective layer is stripped off through the adhesive tape, and the filtration membrane left after stripping is the polymeric membrane with the single oil channel. The preparation method of the polymeric membrane with the single oil channel is simple to operate, can be used for large-scale production, can endow the polymeric membrane with the single oil channel characteristic at a time and has a better effect.