聚乙烯混配料管材与非混配料管材的性能对比研究

Performance analysis of polyethylene compound and noncompound pipes

分别以聚乙烯混配料(以下简称混配料)、聚乙烯本色料加黑色母料(以下简称白加黑)、聚乙烯本色料加外部回用料为原料经熔融挤出成型制备了聚乙烯管材,按照最新版标准GB/T 15558.2—2023分别对其进行炭黑分散、炭黑含量、灰分含量、氧化诱导时间、断裂伸长率及微量金属元素含量等测试,对比研究性能差异。结果表明,聚乙烯混配料制成的管材的炭黑分散、炭黑含量、灰分、微量金属元素含量等性能均符合标准;但采用白加黑所生产的PE管材,其炭黑含量分散度增大,达到2.6%以上或者0.7%以下,不能满足标准要求;炭黑分散等级为A3级~D级,且呈现不稳定性,炭黑分散等级明显低于混配料(A1);采用白料+外部回用料或混配料+外部回收料的聚乙烯管道制品灰分合格率为35%;添加了外部回收料的管材制品中,铁、钙等微量元素的含量明显增加;在混配料加20%外部回用料中,铁元素含量高达18.4 mg/kg,钙元素含量高达862 mg/kg,且微量金属元素含量分布不均匀。

Polyethylene(PE)pipes were prepared through melt extrusion molding using PE compound,PE with color masterbatch,and PE with external recycled material as raw materials.Carbon black(CB)dispersion,CB content,ash content,oxidation induction time,elongation at break,and trace metal element content of the pipes were measured ac⁃cording to national standard GB 15558.2—2023,and their performance differences were studied.The results indicated that the CB dispersion,CB content,and ash qualification rate of the pipe products made of polyethylene compound were 100%.The trace iron and calcium contents were not more than 10 and 250 mg/kg,respectively.This indicates that the compound become a preferred raw material for PE pipes.The CB content of the PE pipes produced by adding color mas⁃terbatch is not stable,even at a concentration of over 2.6%or below 0.7%.The dispersion level of CB with color mas⁃terbatch reached A3~D,indicating instability.The dispersion level of CB was significantly lower than that of com⁃pound.The ash qualification rate of products was 35%when using white materials with external recycled materials or compound with external recycled materials.The content of trace elements such as iron and calcium increased significantly in products with the addition of external recycled materials.In the compound with 20%external recycled materials,the iron and calcium contents were as high as 18.4 and 862 mg/kg,respectively,with an uneven distribution of trace metal elements.