Special hot-melt pressure-sensitive adhesive for BOPP film and preparation method thereof

The invention provides a special hot-melt pressure-sensitive adhesive for a BOPP film and a preparation method of the special hot-melt pressure-sensitive adhesive. The hot-melt pressure-sensitive adhesive is prepared from the following components, by weight: 30 to 60 parts of C5 petroleum resin, 25 to 45 parts of maleic anhydride grafted polyethylene, 28 to 42 parts of SIS (Styrene Isoprene Styrene), 80 to 130 parts of naphthenic oil, 0.5 to 4.5 parts of tackifying synergist, 0.02 to 0.07 part of polyethylene glycol 400, 0.2 to 2 parts of dibutyl phthalate and 0.01 to 1 part of an antioxidant 1076. The preparation method comprises the following steps: uniformly mixing the components, heating the mixture to 52-58 DEG C in an oil bath, keeping the temperature at 52-58 DEG C for 2-5 hours, performing heating to 155-162 DEG C, performing stirring and reacting at 155-162 DEG C at 500-1000 r/min for 35-60 minutes, and performing cooling to room temperature, thereby obtaining the special hot-melt pressure-sensitive