Intermediate membrane for blood collection tube and preparation process of intermediate membrane

The invention provides an intermediate membrane for a blood collection tube and a preparation process of the intermediate membrane, and belongs to the technical field of high-molecular polymer preparation. The preparation process comprises the following steps: stirring and dissolving polyethersulfone, and casting and curing to prepare the base membrane; dispersing chitosan and adding chloroacetic acid for reaction; modifying the nano titanium dioxide with sodium laurate under the assistance of microwaves; mixing modified nano titanium dioxide and silver nitrate to secondarily modify chitosan; soaking and swelling the base membrane, and adding an initiator to carry out a modification reaction; and washing and drying in vacuum. According to the invention, polyether sulfone, polyethylene glycol and dimethylacetamide are used as raw materials to prepare the base membrane, then the modified chitosan is used for modifying the base membrane to prepare the intermediate membrane, and after the intermediate membrane is