Preparation method of solvent resistant nanofiltration membrane

The invention discloses a preparation method of a solvent resistant nanofiltration membrane. The preparation method comprises the steps of dissolving fluorosilicone oil, a cross-linking agent and a catalyst in a solvent, fully stirring to prepare a casting solution, filtering, defoaming, controlling the thickness, uniformly coating a base membrane by the casting solution, placing at room temperature until the solvent is volatized and solidified preliminarily, and further crosslinking at certain room temperature to obtain the fluorinated silicone rubber solvent resistant nanofiltration membrane. The prepared solvent resistant nanofiltration membrane is used for recycling hexane from soybean oil/hexane mixed oil, has excellent separation property, can overcome the disadvantage that the common silicone rubber has organic solvent intolerance, has excellent swelling resisting behavior, and can keep stable separating property after long-time operation.