Transparent Gas Barrier Composite Film And Its Preparation Method

摘要

The invention provides a transparent gas barrier composite film and its preparation method. The transparent gas barrier composite film is formed by having polyvinyl alcohol, graphene oxide and a crosslinking agent undergo blending, crosslinking, film casting and isothermal crystallization processes where a weight ratio of graphene oxide to polyvinyl alcohol is 0.1 wt %, graphene oxide induces crystallization of polyvinyl alcohol to form a hybrid structure compose of polyvinyl alcohol crystals, graphene oxide and the crosslinking agent, crystallinity of polyvinyl alcohol is more than 30%, transmittance of the composite film is more than 85%, and the oxygen transmission rate of the composite film is less than 0.005 cc/m2/day.

主权项

1. A method for preparing a transparent gas barrier composite film, comprising:
providing a polyvinyl alcohol containing aqueous solution; providing a graphene oxide dispersed aqueous solution; performing a blending procedure, to blend the polyvinyl alcohol containing aqueous solution with the graphene oxide dispersed aqueous solution to obtain a casting solution wherein a weight ratio of graphene oxide in the graphene oxide dispersed aqueous solution to polyvinyl alcohol in the polyvinyl alcohol containing aqueous solution is less than 0.1 wt %; performing a cross-linking procedure, to add a cross-linking agent into the casting solution to have in-situ cross-linking reaction; and performing a film-casting procedure, to coat the casting solution after the in-situ cross-linking reaction on a substrate to form a coating and dry the coating so as to obtain a composite film.