Performance analysis of polyethylene compound and noncompound pipes

doi:10.19491/j.issn.1001-9278.2023.12.012

Abstract

Abstract:

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 according 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 masterbatch is not stable， even at a concentration of over 2.6% or below 0.7 %. The dispersion level of CB with color masterbatch reached A3~D， indicating instability. The dispersion level of CB was significantly lower than that of compound. 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.

Key words: polyethylene, compound, carbon black dispersion, ash content, trace metal element

CLC Number:

TQ320.79

XU Lidan, LI Yu, XU Haiyun, XIANG Lubing, CHENG Debao, WANG Zhiwei. Performance analysis of polyethylene compound and noncompound pipes[J]. China Plastics, 2023, 37(12): 78-83.

Figures/Tables 10

Fig.1. Schematic diagram of pipeline sampling

Fig.2. Carbon black content of PE pipes from different raw materials

Fig.3. Carbon black dispersion of PE pipes

样品	炭黑分散等级
混配料1	A1
混配料2	A1
混配料3	A1
白加黑1	C1
白加黑2	D
白加黑3	A3
白加黑4	C1

Tab.1. Carbon black dispersion grade of PE pipes from different raw materials

Fig.4. SEM photos of PE pipes from compound

Fig.5. SEM photos of PE pipes from mixed white and black materials

Fig.6. Ash content of PE pipes

Fig.7. Oxidation induction time of PE pipes

Fig.8. Elongation at break of PE pipes

Fig.9. Content of trace Fe and Ca in PE pipes

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