Vinyl chloride-vinyl acetate modified resin as well as preparation method and application thereof

The invention discloses vinyl chloride-vinyl acetate modified resin as well as a preparation method and application thereof. The structural formula of the vinyl chloride-vinyl acetate modified resin is as follows: # imgabs0 #, L is a vinyl chloride monomer unit, M is a vinyl acetate monomer unit, and N is an alkyl acrylic acid monomer unit with a linear chain and/or cyclic structure; the ratio of x to y to z is 8: (0.95-1.05): (0.7-1.6), n is 15000-25000, the weight-average molecular weight is 25000-45000, and the molecular weight dispersity is 1.6-2.0. The technical problem to be solved by the invention is how to provide the vinyl chloride-vinyl acetate modified resin, so that after an image-text identifier is jet-printed on the surface of an agricultural film by ink-jet ink prepared from the vinyl chloride-vinyl acetate modified resin, the identifier has high adhesion, and the identifier does not fall off after being tested by finger digging and rubbing experiments; and moreover, after the mark is subjected