Double-face heat-sealed and anti-fogging type BOPP (biaxially-oriented polypropylene) film and preparation method thereof

The invention relates to a double-face heat-sealed and anti-fogging type BOPP (biaxially-oriented polypropylene) film and a preparation method thereof. The double-face heat-sealed and anti-fogging type BOPP film is formed by co-extruding and biaxially stretching an inner surface layer, a core layer and an outer surface layer, wherein the inner surface layer and the outer surface layer are respectively made from 97.5-98.5 mass percent of polypropylene and 1.5-2.5 mass percent of anti-sticking agent; the core layer consists of 95.9-97.1 mass percent of polypropylene, 2.5-3.5 mass percent of an anti-fogging agent and 0.4-0.6 mass percent of a slipping agent; the anti-fogging agent consists of the following components by weight percent: 50 percent of sorbitan monostearate, 35 percent of glycerin monooleate and 15 percent of polyethylene oxide (20) glycerin monostearate. The selected polypropylene raw material is good in processing performance and high in mechanical strength. The anti-fogging agent is a mixture of multiple fatty acids and is well compatible with BOPP; by the addition of the anti-fogging agent and ethylene oxide, the hydrophilic performance is greatly improved, and the anti-fogging performance is improved.