▎ 摘　　要

NOVELTY - Preparing a multifunctional load-type nano multilayer composite film involves applying first mixed reaction system comprising polydimethylsiloxane prepolymer, curing agent, fluorocarbon material and first solvent to the surface of the substrate to obtain a super-hydrophobic rough substrate, reacting a second mixed reaction system including a polymer resin, a vinyl monomer, a catechol compound, an amine polymer, and a second solvent, obtaining a uniform casting solution, and apply the uniform casting solution on the super-hydrophobic rough substrate to prepare a polymer microporous support layer. The polymer microporous support layer is brought into full contact with the acid chloride solution to react to form an aminated cross-linked transition layer. Aminated cross-linked transition layer/polymer microporous support layer is prepared. USE - Method for preparing a multifunctional load-type nano multilayer composite film for seawater desalination, sewage purification or oil-water separation (claimed). ADVANTAGE - The method enables to for prepare a multifunctional load-type nano multilayer composite film, which has high porosity, large pore size, fast water molecule penetration rate, and superhydrophobic rough surface prevents the reverse flow of water molecules, aminated cross-linked transition layer is dense and defect-free, improving the separation performance of membrane materials, and provides active sites for the loading of nanomaterials, nano-hybrid multifunctional skin layer can catalyze the degradation of small molecular substances, has bactericidal/bacteriostatic effects, extending the service life of membrane materials, and realize seawater desalination, sewage purification, oil-water separation. DETAILED DESCRIPTION - Preparing a multifunctional load-type nano multilayer composite film involves applying first mixed reaction system comprising polydimethylsiloxane prepolymer, curing agent, fluorocarbon material and first solvent to the surface of the substrate to obtain a super-hydrophobic rough substrate, reacting a second mixed reaction system including a polymer resin, a vinyl monomer, a catechol compound, an amine polymer, and a second solvent, obtaining a uniform casting solution, and apply the uniform casting solution on the super-hydrophobic rough substrate to prepare a polymer microporous support layer. The polymer microporous support layer is brought into full contact with the acid chloride solution to react to form an aminated cross-linked transition layer. Aminated cross-linked transition layer/polymer microporous support layer is prepared. The aminated crosslinking transition layer/polymer microporous support layer is contacted with the third mixed reaction system containing citric acid, metal compounds, graphite phase nitrogen carbide and a third solvent. The reaction generates a nano-hybrid multi-skin layer to prepare a nano-hybrid multi-skin layer/aminated cross-linking transition layer/polymer microporous support layer, that is, a multifunctional load-type nano multilayer composite film.