Additive composition and preparation method thereof, linear low-density polyethylene composition and preparation method thereof, and polyethylene cast packaging film

The invention relates to the field of polyethylene cast packaging films, and discloses an additive composition and a preparation method thereof, a linear low-density polyethylene composition and a preparation method thereof, and a polyethylene cast packaging film. Based on the total weight of the additive composition, the additive composition comprises the following components in percentage by weight: 15-20% of a hindered phenol antioxidant, 15-20% of a phosphite antioxidant, 2-5% of stearate, 2-15% of hydrotalcite, 40-50% of silicon dioxide and 1-3% of an anti-static agent. The additive composition formed by adopting the formula is mixed with linear low-density polyethylene and metallocene, so that an extrusion-molded film is smooth in surface, free of crystal points, low in haze, low inheat sealing temperature and excellent in process-ability. 本发明涉及聚乙烯流延包装膜领域，公开了一种助剂组合物及其制备方法、线性低密度聚乙烯组合物及其制备方法和聚乙烯流延包装膜。以所述助剂组合物的总重量为基准，所述助剂组合物包括受阻酚类抗氧剂15-20重量％，亚磷酸酯抗氧剂15-20重量％，硬脂酸盐2-5重量％，水滑石2-15重量％，二氧化硅40-50重量％，抗静电剂1-3重量％。采用以