Ink binder, also known as ink additive, is an important part of printing ink and a fluid part of ink. The rheology, viscosity, drying, film forming and printing performance of printing ink mainly depend on the binder. The solid components in the ink can be ground in the manufacturing process by the wetting effect of the binder, and the transfer in the printing process can be completed by its viscosity. On the printed matter, the ink film with luster and fastness can be formed by the drying film-forming property of the binder, thus protecting the pigment.