The invention provides a preparation method of a multifunctional light-conversion thin film added with
rare earth and relates to the technical film of thin films. The multifunctional light-conversion thin film is composed of low-density
polyethylene (LDPE), linear low-density
polyethylene (LLDPE),
metallocene polyethylene, a rare-earth light conversion agent, an anti-
ageing agent and an antifogging agent. The preparation method is characterized by particularly comprising the following steps of: (1) mixing the LDPE, the rare-earth light conversion agent, the anti-
ageing agent and the antifogging agent; carrying out
drying treatment on the mixture; after
drying the mixture, extruding and granulating through a granulating
machine; and
drying and sieving grains to obtain a master batch; (2) mixing the LDPE, the LLDPE, mLLDPE and the master batch; mixing, and extruding and carrying out film blowing through an extruding
machine; drawing and winding after cooling by an air ring to obtain a finish product; and (3) checking and packaging the finished product, and storing to obtain the multifunctional light-conversion thin film added with the
rare earth. The multifunctional light-conversion thin film added with the
rare earth can improve the photo-thermal effectiveness, enhances the
photosynthetic capacity of crops, and increases the accumulation of dry substances; the content of
chlorophyll,
starch and
sugar in the crops is improved and the absorption capability of
nitrogen is improved, the yield of the crops is increased and the quality is improved; and meanwhile, the multifunctional light-conversion thin film added with the rare earth has the properties of long service life, antifogging property and the like.