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Conductive carbon black (CB) is a key component of shielding materials for high-voltage cables, and its structural characteristics have a decisive impact on the comprehensive performance of shielding materials. To address the issue of the deterioration of mechanical and processing properties of shielding materials caused by the high content of tradi-tional low-structural degree CB, this study prepared high-voltage cable shielding materials using ethylene-butyl acrylate copolymer (EBA) as the matrix and high-structural degree CB as the conductive filler. The electrical, mechanical, and processing properties of the shielding materials were systematically evaluated. The results show that high-structural degree CB has a significant advantage in constructing conductive networks due to its well-developed chain-like aggregates. The volume fraction percolation threshold of the shielding material is only 8.0%. When the high-structural degree CB mass fraction is 30%, the volume resistivity of the shielding material at 23℃ and 90℃ reaches 71 Ω·cm and 279 Ω·cm, respectively, and the elongation at break and tensile strength are 419% and 16.8 MPa, respectively, which meet the requirements of high-voltage cable standards. Compared with the shielding material added with a mass fraction of 35% low-structural degree CB, its maximum temperature rise and equilibrium torque during the mixing process decrease significantly, and the scorch resistance performance improves notably. Mechanistic analysis shows that high-structural degree CB enhances the filler network through physical cross-linking, increasing the storage modulus and complex viscosity of the shielding material. Meanwhile, the dense three-dimensional network structure formed by high-structural degree CB in the matrix inhibits the movement of EBA segments, resulting in a decrease in crystallinity.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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