▎ 摘　　要

NOVELTY - Preparing composite film for warning film rupture, comprises preparing konjac glucomannan solution glue, carrying out gradient dilution of konjac glucomannan, adding glycerin and graphene oxide solution under mixing and stirring to obtain konjac glucomannan solution glue. The konjac glucomannan solution is glued into a film to form a konjac glucomannan solution film, where the konjac glucomannan solution film comprises a first konjac glucomannan solution film (1) and a second konjac glucomannan solution film (2). The first konjac glucomannan solution film and the second konjac glucomannan solution film are flattened for vacuum drying and degassing treatment, and then soaked in dialdehyde. USE - Method for preparing composite film for warning film rupture. ADVANTAGE - The prepared composite film can rapidly and timely generate the obvious color development phenomenon under the action of the hydrophilic layer, effectively blocks the ultraviolet rays, protects the litmus liquid film, and effectively buffers the intensity of light and effectively protects the first layer of sandwich structure. DETAILED DESCRIPTION - Preparing composite film for warning film rupture, comprises preparing konjac glucomannan solution glue, carrying out gradient dilution of konjac glucomannan, adding glycerin and graphene oxide solution under mixing and stirring to obtain konjac glucomannan solution glue. The konjac glucomannan solution is glued into a film to form a konjac glucomannan solution film, where the konjac glucomannan solution film comprises a first konjac glucomannan solution film (1) and a second konjac glucomannan solution film (2). The first konjac glucomannan solution film and the second konjac glucomannan solution film are flattened for vacuum drying and degassing treatment, and then soaked in dialdehyde. The first konjac glucomannan solution film and the second konjac glucomannan solution film form a hydrophobic layer (5) on one side, and a hydrophilic layer on the other side (6). The hydrophobic layer of the first konjac glucomannan solution film is used as the bottom layer, and sprayed the aramid nanofiber dispersion liquid on the hydrophilic layer of the first konjac glucomannan solution adhesive film to obtain the aramid nanofiber film (3). The litmus solution is sprayed on the aramid nanofiber film to obtain a litmus film (4). The aramid nanofiber dispersion liquid is sprayed on the litmus film again to obtain the aramid nanofiber film. The hydrophobic layer of the second konjac glucomannan solution film is used as the top layer. The hydrophilic layer of the second konjac glucomannan solution adhesive film is adhered on the aramid nanofiber film, vacuum dried, and dried after gradient heating to obtain composite film for warning film rupture. DESCRIPTION OF DRAWING(S) - The drawing shows a structure schematic diagram of a composite film for warning film rupture. 1First konjac glucomannan solution film 2Second konjac glucomannan solution adhesive film 3Aramid fibre nanometre fibre film 4Stone pistil film 5, 6Hydrophobic layers