The application discloses a PET matte base film for labels and a preparation method thereof. The PET matte base film is composed of
terephthalic acid,
ethylene glycol, a catalyst, tetraethoxysilane, 1,4-
cyclohexane dimethanol, 3-aminopropyl
triethoxysilane and an
antioxidant, and nano composite particles are generated in situ in a
polyester esterification-polycondensation process. After the molten
polyester is extruded, the film passes through a homogenizing roller and a flattening vacuum shaping device in sequence, and then is subjected to bidirectional stretching, so that a matte PET base film with uniform thickness and uniform micro-nano rough structure on the surface is obtained. The base film has low gloss, uniform matte effect, high longitudinal and transverse tensile strength, moderate breaking elongation, excellent flexibility and printing adhesion, and is suitable for
adhesive labels and
consumer product labels. Through composite component design and optimization of a
processing process, the application effectively improves the problems of surface light spots, uneven gloss and unstable mechanical properties of the existing PET matte film for labels, realizes high balance between the matte effect and the mechanical properties, and has good industrial application value.