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Three brands of commercial cross-linked polyethylene insulating materials for high-voltage cables were selected as the research objects. At first, the scorching resistance of three insulating materials was compared and analyzed by the change rule of melt torque of insulating materials with temperature under the action of high temperature shearing, and the scorching degree of the scorched sample was characterized by the gel content. Then, the method of using the torque change rate of insulating material melt under high temperature as the characteristic quantity to characterize the scorching resistance of insulating material was proposed, and the effectiveness of this method was verified by characterizing the scorching degree of different brands of commercial insulating materials. In addition, the crosslinking agent content and antioxidant content in the three insulating materials were compared and analyzed by infrared spectrum, and the correlations between the additive content of insulating material, the molecular weight of base material, and its scorch resistance were established on the basis of molecular weight of insulating material base material measured by gel permeation chromatography. The results show that the scorching resistance of different commercial insulating materials can be effectively distinguished by the torque analysis on insulating materials under the action of high temperature shearing. It is found that the high content of crosslinking agent is the main reason for the poor scorching resistance of insulating materials, and the scorching resistance of insulating materials can be improved by appropriately reducing the crosslinking agent content, increasing the antioxidant content, and reducing the weight average molecular weight.
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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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