The invention discloses a high-temperature-resistant composite packaging film, which is made of the following raw materials in parts by weight: 50–60 parts of modified polyethylene resin, 6–8 parts of modified talc powder, and 1.5–2 parts of liquid paraffin. The packaging film is prepared by uniformly mixing the modified polyethylene resin, modified talc powder and liquid paraffin in a high-speed mixer, adding the mixture into a twin-screw extruder for melt blending and extrusion, forming a sheet through a die head, and cooling to form a film via a casting roll. By using modified polyethylene resin as the matrix of the packaging film, the invention not only forms a crosslinked network structure to improve the heat resistance and toughness of the film, but also introduces epoxy functional groups into the polymer matrix. The modified talc powder used is surface-grafted with organic molecular chains after treatment, which not only reduces agglomeration between talc particles, but also introduces amino functional groups on the talc surface that interact with the epoxy groups of the matrix, promoting the dispersion of talc in the PE matrix and further improving the heat resistance of the packaging film.
Country Code: CN
Application Number: CN202010276230.6
