Preparation method for grape preservative film master batches containing rare earth complex

The invention relates to a preparation method for grape preservative film master batches containing rare earth complex.The grape preservative film master batches are formed by using LLDPE as carrier resin and adding tourmaline powder, the rare earth complex, kieselguhr, oleamide and sodium stearate through cladding dispersing, interface modification, material mixing, extruding and grain cutting.The molar ratio of lanthanum ions, yttrium ions, samarium ions and cerium ions in the rare earth complex is (2.90-3.00): (0.45-0.50): (0.95-1.05): (1.15-1.25).The master batches prepared through the method are added into LLDPE resin according to the proportion of 4-8%, the mixture is subjected to blow molding to form a film, and the film is used for retaining freshness of grapes and packaging the grapes and can restrain the respiration intensity and growth of microorganisms on the surface in the storing process, slow down the softening process and prolong the refreshing time by 7-10 days under the normal temperature co