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To address the stringent service requirements of AC contactor contact supports, linear phenolic resin was used for the blending modification of amino molding compounds. The effects of phenolic resin contents on mechanical properties, heat resistance, wear resistance, and electrical insulation properties of samples were investigated systematically. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were employed to characterize the microstructure of samples, and the interaction between molding temperature and formulation was further explored. Meanwhile, the mechanical life tests of finished supports were carried out. The results show that within the range of phenolic resin mass fraction from 0% to 25%, condensation reaction occurs between phenolic resin and amino resin to form a semi-interpenetrating polymer network. When the mass fraction of phenolic resin is 15%, the comprehensive performance of the sample is the best. Its unnotched impact strength, flexural strength, deflection temperature under load, and power frequency electric strength increase by 47.9%, 41.1%, 69.1%, and 32.8%, respectively, compared with those of the pristine amino molding compound. Further increasing the content of phenolic resin, the mechanical properties of samples only slighty decrease. When the mass fraction of phenolic resin is 25%, the wear resistance of the sample is the best, and the average wear loss is 87.2% lower than that of the pure amino sample. Within the molding temperature range of 160-180℃, phenolic resin with a mass fraction of 15% and high-temperature curing has a synergistic effect on the molding compound. The modified materials prepared by using phenolic resins with a mass fraction of 15% or above are used to form the contactor's contact switch, and the mechanical life of the contactor can reach 12 million cycles, which can meet the requirements for long-term service.
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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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