In-situ grafted anti-pollution hydrophilic modified film and preparation method thereof

The invention provides a preparation method of an in-situ grafted anti-pollution hydrophilic modified film, and the method comprises the following steps: uniformly dispersing a film substrate polymerand a styrene maleic anhydride copolymer additive in a solvent, stirring at room temperature to sufficiently dissolve, and carrying out ultrasonic defoaming to obtain a homogeneous bubble-free film casting solution; and casting the film casting solution on a glass plate, scraping the film casting solution into a film with a certain thickness, immersing the film in a polyethyleneimine solution witha certain concentration for gelation, curing and hydrophilic polymer grafting reaction, soaking the film in deionized water for 24-36 hours, fully rinsing the film with deionized water, and airing the film at room temperature to obtain the hydrophilic modified film. The invention also provides the in-situ grafted anti-pollution hydrophilic modified film prepared by the method. According to the in-situ grafted anti-polluti