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Polyethylene-based non-crosslinked cable insulation materials have better electrical and mechanical properties, simpler processing, lower energy consumption than XLPE, and can recycle, which are one of the most promising new environmentally friendly cable insulation materials. In this paper, LLDPE/HDPE blending insulating materials with different ratios were prepared using domestically produced base materials, and their electrical, mechanical, rheological, and thermal and oxygen aging resistance properties were tested and compared with the blending materials prepared by imported base materials. The results show that both the domestic and imported blending materials have the best electrical properties and mechanical properties when the mass ratio of LLDPE and HDPE is 7:3. The electrical properties of the domestic blending materials are similar to those of the imported blending materials at the optimal ratio, but the tensile strength is lower. There is a significant difference between domestic and imported blending materials in thermal and oxygen ageing resistance. Through the molecular weight and its distribution test, infrared spectroscopy analysis, it is found that the branching degree of domestic LLDPE is similar to that of imported LLDPE, but its molecular weight distribution range is wider and there is an obvious long-tailed distribution in the direction of low molecules, which may be one of the reasons for the lower tensile strength and antioxidant properties of domestic blending materials.
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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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