| abstract |
The invention provides a high-light-blocking heat-shrinkable polyester film and a preparation method and application thereof. The polyester film at least includes a white functional layer A and a black functional layer B; the raw material composition of the A layer includes a white pigment A and a resin A, and the resin A includes a modified polyethylene terephthalate A, and the white pigment A contains The mass percentage is 5%-50%; the raw material composition of layer B includes black pigment B and resin B, resin B includes modified polyethylene terephthalate B, and the mass percentage of black pigment B is 0.0025%-15% %. Modified polyethylene terephthalate A and modified resin B are modified with at least one of isophthalic acid, 1,4-cyclohexanedimethanol, octapentanediol, propylene glycol and butanediol agent. The above polyester film can be directly or printed with a pattern, at 60-150 ℃, after shrinking, it can be tightly wrapped on the surface of the container to achieve the effect of light blocking and decoration, and meet the needs of beverage packaging for light shading and aesthetics. |