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Epoxy resin is extensively utilized in high-voltage power equipment and electronic encapsulation, but it is prone to microcracks under prolonged multi-field stresses, leading to insulation degradation and even equipment failure. Introducing self-healing microcapsules can effectively solve this problem, however conventional microcapsules have limitations such as strict triggering conditions, requiring external intervention, and the potential to damage the matrix. Therefore, this study designed a non-contact light-triggered microcapsule with urea-formaldehyde resin as the wall material and polyurethane acrylate oligomer as the core material. By embedding TiO2 and SiO2 nanoparticles with an average particle size of 200 nm into the wall material, an ultraviolet shielding layer was constructed, then the microcapsule was uniformly dispersed in the epoxy resin to prepare a composite material to achieve self-healing under natural light. The results show that the microcapsule structure remains intact at 210℃ and its thermal stability is excellent. When the mass fraction of microcapsules is 4%, the electric strength and dielectric performances of the composite materials are basically the same as those of the pure base material, with only a slight increase in tensile strength. After the damaged material is repaired, the recovery rate of tensile strength, electric strength at room temperature and high temperature, as well as volume resistivity all exceed 85%, the repair performance is excellent. This study provides a novel technical pathway to prolong the service life of epoxy resin insulating 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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