Method for preparing a base film of modified polyvinyl alcohol polymer

摘要

The present invention provides a base film of modified polyvinyl alcohol as well as a method for preparing the base film of modified polyvinyl alcohol and a polarizer made from the base film. The method includes steps of: (1) executing surface graft modification of nano-silicon dioxide particles with fluorinated silane to obtain a modified nano-silicon dioxide powder; (2) adding the modified nano-silicon dioxide powder obtained from the step (1) to an aqueous solution of polyvinyl alcohol polymer, in order to prepare a composite solution of polyvinyl alcohol polymer; and (3) pouring the composite solution of polyvinyl alcohol polymer prepared from the step (2) onto a surface of a casting substrate to obtain a base film of modified polyvinyl alcohol (PVA). The present invention enhances the heat and humidity resistances and the stability of the PVA base film, and improves its mechanical performance and sticking-resistance.

主权项

1. A method for preparing a base film of modified polyvinyl alcohol polymer, comprising the following steps of:
(1) modifying nano-silicon dioxide particles with a fluorinated silane by a surface graft modification to obtain a modified nano-silicon dioxide powder; (2) adding the modified nano-silicon dioxide powder obtained from the step (1) into an aqueous solution of polyvinyl alcohol polymer to form a composite solution of polyvinyl alcohol polymer; (3) pouring the composite solution of polyvinyl alcohol polymer prepared from the step (2) onto a surface of a casting substrate, in order to obtain a base film of modified polyvinyl alcohol polymer; and (4) bonding iodine molecules to the polyvinyl alcohol polymer in the base film of modified polyvinyl alcohol polymer by dyeing with an iodine solution.