The invention discloses a low-temperature high-shrinkage PETG shrink film, which adopts a three-layer co-
extrusion structure, and comprises a
surface layer, a core layer and a bottom layer, the core layer is prepared from a PETG shrink film functional master batch accounting for 90-95 wt% of the total
mass and PETG for a common film, and the PETG shrink film functional master batch is prepared from the following raw materials in parts by weight: 100-120 parts of
terephthalic acid, 100-120 parts of 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 100-120 parts of 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 100-120 parts of 1, 2, 4-trimethyl-1, 3-pentanediol The invention relates to a high-temperature-resistant
polyurethane adhesive which is prepared from the following components in parts by weight: 30 to 50 parts of 1, 4-
cyclohexanedimethanol, 80 to 100 parts of
ethylene glycol, 0.1 to 0.2 part of triaryl
phosphate, 0.01 to 0.03 part of
isocyanate, 0.01 to 0.02 part of
potassium tripolyphosphate, 0.1 to 0.2 part of
magnesium aluminum silicate, 0.2 to 0.4 part of disodium
ethylene diamine tetraacetate and 0.3 to 0.5 part of other auxiliaries. The invention also discloses a preparation method of the shrink film. The transverse
thermal shrinkage rate of the PETG shrink film with a three-layer structure prepared by taking the functional master batch as a core layer is greater than 70% at 80 DEG C, and when the PETG shrink film is used as a
label of an outer
package of a product, the PETG shrink film has relatively good shrink packaging performance on special-shaped bottles, common PP bottles and the like, and the packaging bottles are not easy to damage and deform.