High-temperature water-soluble falling type thermal shrinkage label film and preparation method thereof

The invention provides a high-temperature water-soluble falling type thermal shrinkage label film. The high-temperature water-soluble falling type thermal shrinkage label film comprises the followingpolymers: at least one PVC polymer as well as at least one water-soluble PVA grafted copolymer; the alcoholysis degree of the PVA grafted copolymer is more than 89 percent; the PVA grafted copolymer is dissolved at 50 to 80 DEG C and accounts for at least 20 percent of the total weight of the label film; and the PVC polymer and the PVA grafted copolymer with the alcoholysis degree being more than89 percent are mixed and the PVA grafted copolymer is dissolved by increasing the temperature, so that the label film is separated from a bottle body and the recycling is facilitated. 本发明提供了高温水溶落型热收缩标签膜，包括以下聚合物：至少一个PVC聚合物，以及至少一个水溶性PVA接枝共聚物，其中PVA接枝共聚物醇解度在89％以上，且50-80℃溶解，其重量占比至少20％，基于标签膜的总重量计，本发明采用PVC聚合物与醇解度89％以上的PVA接枝共聚物共混，提升温度溶解PVA接枝共聚物，从而使标签膜与瓶体分离，便于回收再次利用。