Rosin-based quaternary ammonium salt for preparing efficient environment-friendly multifunctional cooling water biocide as well as preparation method and application of rosin-based quaternary ammonium salt

The invention discloses a rosinyl quaternary ammonium salt for preparing an efficient environment-friendly multifunctional cooling water biocide and a preparation method and an application of the rosinyl quaternary ammonium salt for preparing the efficient environment-friendly multifunctional cooling water biocide, and the structural formula of the rosinyl quaternary ammonium salt for preparing the efficient environment-friendly multifunctional cooling water biocide is shown in the specification. According to the invention, rosin is used as a raw material, belongs to a bio-based green product, has the characteristics of reproducibility and degradability, and conforms to a green product; the preparation method is simple and convenient to operate; the method can be used for preparing a biocidal scale inhibitor; the biocidal scale inhibitor obtained by the invention has broad-spectrum and efficient sterilization and algae removal capabilities, can effectively control the reproduction of bacteria and algae in wat