紫外交联高密度聚乙烯材料的制备及性能研究

Preparation and properties of ultraviolet crosslinked high⁃density polyethylene materials

选择高密度聚乙烯(PE⁃HD)作为基础树脂,筛选与之适配的光引发体系制备紫外交联高密度聚乙烯材料(PE⁃Xe),对配方进行优化并对工艺进行探究,对紫外光的穿透性做了系统的试验,并研究了光敏剂和交联剂添加量、紫外灯功率、线速度对PE⁃Xe材料交联度的影响。结果表明:紫外光的穿透能力可以达到9.5 mm,当光敏剂和交联剂的添加量为0.7%(质量分数,下同)时,紫外灯功率为500 W时,材料的交联度可以达到75%以上,制备的管材耐压性好、力学性能优,结晶度达到40%以上,200℃时的氧化诱导时间(OIT)大于20 min。

In this study,high⁃density polyethylene was selected as a base resin,and a suitable photoinitiation system was se⁃lected to prepare ultraviolet(UV)⁃crosslinked high⁃density polyethylene(PE⁃Xe).The formula was optimized and the pro⁃cess was explored.The penetration of ultraviolet light was systematically tested.At the same time,the effects of the amounts of photosensitizer and crosslinker,the power of UV lamp,and line velocity on the crosslinking degree of the PE⁃Xe materials were studied.The results indicated that the penetration ability of ultraviolet light reached 9.5 mm.When the addition amounts of photosensitizer and crosslinking agent was 0.7 wt%,and the UV lamp power was 500 W,the crosslink⁃ing degree of the PE⁃Xe material reached over 75%.The prepared pipe exhibited good pressure resistance,excellent me⁃chanical properties,and a crystalline degree of over 40%,and its oxidation induction time at 200℃was greater than 20 min.