Preparation method of polyethylene composition, produced by gas phase fluidized bed process, for automobile fuel tanks

The invention provides a preparation method of a polyethylene composition, produced by a gas phase fluidized bed process, for automobile fuel tanks. In a single-reactor gas phase fluidized bed polyethylene process, a chromium-titanium composite catalyst is selected for use, alpha-olefin is taken as a comonomer, and carbon fibers are added into a seed bed in a polyethylene production process. After the preparation method is adopted, the selected process conditions can be suitable for ternary copolymerization and the addition of the carbon fibers, so that the performance of the product is enabled to meet the product requirements. 本发明提供种气相流化床工艺生产的汽车油箱用聚乙烯组合物的制备方法，在单反应器的气相流化床聚乙烯工艺上，选用铬钛复合催化剂，α-烯烃为共聚单体，聚乙烯生产过程中在种子床中添加碳纤维。解决的问题是选取的工艺条件能够适合三元共聚和碳纤维的加入，使产品的性能复合制品要求。