Special master batch of BOPP synthetic paper and preparation method thereof

The invention discloses special master batch of BOPP synthetic paper and a preparation method thereof. The master batch comprises the following components by weight percent: 27%-40% of polypropylene resin, 58-70% of functional filler, 0.2%-0.5% of antioxidant, 0.2%-1% of lubricant, 0.2%-0.5% of fluorecent whitening agent and 0.5-1.5% of titanium dioxide powder. The special master batch of BOPP synthetic paper provided by the invention not only has good physical mechanical property, but also excellent separating performance so as to ensure that the packaged matter does not be deformed; in addition, the formed film has nacreous effect, strong decorative performance and good printing performance. The preparation method of the invention adopts side-open type multipoint feeding design, and overcomes the problems that a great deal of premix is needed, the production efficiency is low and the extrusion of master batch is easy to block the filter screen, produce a lot of oil fume and break the filter screen in the traditional master batch two-step manufacturing process. The preparation method of the invention simplifies the manufacturing process of the preparation method of master batch of nacreous synthetic paper, increases the production efficiency, reduces the unit energy consumption and greatly improves the quality of master batch, thus having very important practical significance.