Low-density polypropylene composite material, preparation method and application thereof

The invention relates to a low-density polypropylene composite material, which comprises the following raw materials in percentage by weight: 62-90% of a polypropylene resin, 2-20% of a toughening agent, 2-11% of talcum powder K, 1-7.5% of talcum powder T, and 0.3-3% of an auxiliary agent, wherein the median particle size D50 of the talcum powder K is 4.5-6.5 [mu]m, the length-diameter ratio of the talcum powder K is 1-2, the median particle size D50 of the talcum powder T is 1.0-3.0 [mu]m, and the length-diameter ratio of the talcum powder T is 3.1-4.8. The low-density polypropylene compositematerial can meet the requirement for light weight of an automobile, can be used for preparing thin automobile parts, and is high in rigidity and good in toughness and appearance. 本发明涉及一种低密度聚丙烯复合材料，包括有以下重量百分比的原料：聚丙烯树脂62～90％；增韧剂2～20％；滑石粉K 2～11％；滑石粉T 1～7.5％；助剂0.3-3％；所述滑石粉K的中位粒径D50为4.5μm～6.5μm，长径比为1～2；所述滑石粉T的中位粒径D50为1.0μm～3.0μm，长径比为3.1～4.8。上述低密度聚丙烯复合材料能够满足汽车轻量化的需求，制备更薄的汽车零部件，刚性强并具有较好的韧性和外观。