Preparation method of high-impact-resistance thin-wall injection molding polypropylene food packaging special material

The invention discloses a preparation method of a special material for high-impact-resistance thin-wall injection molding polypropylene food packaging. The preparation method is specifically implemented according to the following steps: step 1, adding two electron donors into a first reaction kettle according to a fixed feeding ratio; 2, controlling the molar concentration ratio of ethylene to propylene and the molar concentration ratio of hydrogen to propylene in gas-phase components in the first reaction kettle and the second reaction kettle; and step 3, adding a special compound additive, and then adjusting the control parameters of an extrusion granulating unit. On the basis of ensuring the original high flowability and high rigidity, the transparency and impact strength of the polypropylene product are improved, and the technical bottleneck that the pressure of the polymerization reaction kettle cannot be controlled due to high hydrogen content in the prior art is thoroughly solved. The long-period conti