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The insulation master batch was prepared by twin-screw extruder and internal mixer, and then it was used to prepare HVDC cable insulation. The dispersing property of nanoparticles in insulation was quantitatively analyzed by transmission electron microscope (TEM) and Image J software, and the electrical properties of insulation were tested. The results show that it is difficult to determine the dispersion and distribution degree of nanoparticles in nano-composite DC materials by qualitative analysis through TEM, while the characteristic data of nanoparticles in TEM images can be extracted by Image J, so as to quantitatively analyze the dispersion properties of nanoparticles. Compared with DC material using the master batch prepared by internal mixer, the DC material using the master batch by twin-screw extruder have better electrical properties, and nanoparticles are more evenly distributed and better dispersed in it.
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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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