Properties of Irradiated Polyethylene Hot-Melt Tape and Its Application in Cable Insulation Layer Rejuvenation

doi:10.19894/j.issn.1000-0518.240247

Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (11): 1648-1655.DOI: 10.19894/j.issn.1000-0518.240247

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Properties of Irradiated Polyethylene Hot-Melt Tape and Its Application in Cable Insulation Layer Rejuvenation

Jing-Wei LI¹, Rui-Peng ZHENG¹(), Ming YANG², Juan ZHAO², Shuai ZHENG², Ya-Ke LI³, Yun-Xia QI², Yi-Quan XU², Bai-Jun LIU³

^1.Nuclear and Radiation Safety Center of the Ministry of Ecology and Environment，National Nuclear and Radiation Regulatory Technology Research and Development Base，Beijing 102400，China
^2.Zhongke Yinghua Changchun High Tech Co. ?，Ltd. ?，Changchun 130000，China
^3.College of Chemistry，Jilin University，Changchun 130012，China

Received:2024-08-05 Accepted:2024-11-03 Published:2024-11-01 Online:2024-12-04
Contact: Rui-Peng ZHENG
About author:zhengruipeng123@126.com
Supported by:
the Industry-University Collaborative Development Project of CAIC-Jul(3R2231166412)

Abstract

Abstract:

The damage to the insulation layer of cables directly affects the safety of electricity use， and the research on economical and environmentally friendly rejuvenation materials and methods is of great significance. This work firstly investigates the influence of electron beam （EB） irradiation on the thermal and mechanical properties of polyethylene （PE） tape at different doses in detail. On this basis， a method for repairing the insulation layer of locally damaged cross-linked polyethylene （XLPE） cables is proposed by utilizing the unique hot-melt and thermal-shrinkage characteristics of low-dose irradiated PE materials， and a specific rejuvenation procedure is provided. The research results indicate that low-dose irradiated PE hot-melt tape can effectively repair damaged cable insulation layers， and the repair layer is tightly fused with the original insulation layer. After irradiation at a dose of 40 kGy， the tensile strength is 16.9 MPa， and the elongation at break is 638.5%. The resistance reaches 2.94×10¹² Ω， and the volume resistance is 5.89×10¹⁴ Ω·m， which meets the requirement of cable applications. The repaired cable withstands the 10 kV AC voltage test at 39 kV/5 min and partial discharge test at 15 kV≤5 PC. It can be seen that low-dose irradiated PE hot-melt tape has important application prospects in the field of cable rejuvenation.

Key words: Irradiation crosslinking, Polyethylene, Cables, Rejuvenation

CLC Number:

O631

Jing-Wei LI, Rui-Peng ZHENG, Ming YANG, Juan ZHAO, Shuai ZHENG, Ya-Ke LI, Yun-Xia QI, Yi-Quan XU, Bai-Jun LIU. Properties of Irradiated Polyethylene Hot-Melt Tape and Its Application in Cable Insulation Layer Rejuvenation[J]. Chinese Journal of Applied Chemistry, 2024, 41(11): 1648-1655.

Figures/Tables 10

Table 1 Basic properties of PE tapes irradiated by different doses

No	Irradiation dose/kGy	w（gel）/%	Tensile strength/MPa	Young′s modulus/GPa	Elongation at break/%
1	0	--	16.5	0.604	632.7
2	20	22.9	16.0	0.512	615.9
3	40	33.6	16.9	0.579	638.5
4	60	45.6	16.7	0.569	581.0
5	80	56.1	16.5	0.671	552.3
6	100	59.2	16.8	0.635	534.4
7	120	63.2	16.9	0.637	445.0

Fig.1 Relationship between irradiation dose and gel content （mass percent） of the PE tapes

Fig.2 Illustration of cross-linked structure of PE tapes after irradiation by different doses

Fig.3 DSC heating curves （A） and cooling curves （B） of PE tapes at different irradiation doses

Table 2 Enthalpy values and crystallization degrees of PE tapes irradiated by different doses

No.	Melting peak temperature/℃	Melting enthalpy/ （J·g^-1）	Crystallization peak temperature/℃	Crystallization enthalpy/ （J·g^-1）	Crystallinity/%	TD/℃
1	117.3	112.7	110.3	104.3	38.8	443
2	117.3	125.0	110.4	125.6	43.1	435
3	116.7	120.7	110.1	115.7	41.6	439
4	118.2	103.3	109.8	120.0	35.6	442
5	117.0	107.7	109.9	126.3	37.1	443
6	117.8	112.9	109.6	124.6	38.9	443
7	116.4	127.5	109.9	126.5	44.0	440

Fig.4 Molten process enthalpy values （A） and crystallization process （B） enthalpy values of PE belt

Fig.5 TGA （A） and DTG （B） curves of PE tapes at different irradiation doses

Fig.6 Tensile stresses （A） and elongations at break （B） of PE tapes under different irradiation doses

Fig.7 Schematic diagram of the rejuvenation process for damaged parts of cable insulation layer

Fig.8 Photos of the rejuvenation result of cable

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Properties of Irradiated Polyethylene Hot-Melt Tape and Its Application in Cable Insulation Layer Rejuvenation

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