Patent ID: 9290674
Filing Date: 2016-03-22
CPC Classification: B05D,B82Y,C01P,C08J,C08K,C09C,C09D,G02B,Y10T

Claim Text:
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.