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In this paper, the thermal oxidation process of soybean insulating oil was studied by molecular dynamics simulation. The oxidative decomposition path of soybean insulating oil in oxygen atmosphere and temperature rise was simulated. The decomposition products of vegetable insulating oil were analyzed, and the oxidation activation energy of vegetable insulating oil was calculated. The results show that the oxidation activation energy Ea of palmitic acid, oleic acid, and linoleic acid required for the oxidation reaction decreases in turn, indicating that there are differences about the thermal oxidation stability of palmitic acid, oleic acid, and linoleic acid. According to the decomposition and polymerization of substances after reaction, the high temperature oxidation reaction can be divided into two types: oxidative decomposition reaction and oxidative polymerization reaction. The products of high temperature oxidation reaction mainly include oxidized triglyceride, oxidized triglyceride polymer, and short carbon chain triglyceride and volatile compounds. The formation modes of these three types of oxidation products are different, but the types of compounds used are similar. Oxygen is easy to diffuse in soybean oil, and the effect of fatty acids from vegetable insulating oil on the antioxidant properties of soybean oil from high to low is palmitic acid, oleic acid, and linoleic acid. The more unsaturated the fatty acids, the easier they are oxidized.
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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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