The invention relates to a yellowing-resistant and bottom-impermeable
polymer engineering membrane. The glue of the
engineering membrane used at the present stage is mainly
polyurethane glue, and mainly has the problem of intolerance to yellowing, so that
chromatic aberration exists, and the use and attractiveness are influenced. The membrane is characterized by comprising a PET
surface layer, a glue layer, an outer milky-white master batch layer, an inner milky-white master batch layer and a base membrane, wherein the outer milky-white master batch layer comprises LDPE and milky white
masterbatch, the inner milky-white master batch layer comprises LLDPE and milky white master batch, the glue layer is prepared from the following materials in parts by weight: 90 parts of
acrylic acid glue,8-12 parts of tackifying resin, 0.1-0.5 part of a curing agent, 10 parts of waterborne
polyurethane resin, 15 parts of modified
nano silicon dioxide and 70-90 parts of a
solvent, and the
solvent is selected from
ethyl acetate or methylbenzene. The membrane has the advantages of excellent flatness, smooth finish, few
crystal points, strong covering property, no bottom penetration and no color penetration. By improving a glue formula and combining the milky-white master batch layer, a better yellowing-resistant effect is achieved, and no
color difference is generated after long-term use.