| abstract |
The invention discloses a preparation method of a special polyvinyl alcohol material for optical films. Under the protection of nitrogen, vinyl acetate is used as a raw material, low carbon acetate as a solvent, and a peroxide as an initiator, and a solution polymerization method is adopted. Methods The polyvinyl acetate solution was prepared, and then the special material of polyvinyl alcohol for optical film was prepared by alcoholysis. The polyvinyl alcohol prepared by the method has narrow molecular weight distribution, low 1,2-diol content and high syndiotactic structure content, can improve the tensile properties of the downstream PVA optical film, and has high practical significance and good popularization and application. value. |