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A high-performance organsilicone encapsulant was prepared with vinyl silicone oil interchange as base polymer, hydrogen-containing silicone oil as crosslinker agent, fumed silica and MQ silicone resin as reinfocing materials, magnesium hydroxide and FCA107 as flame-retardant filler. The effects of the ratio of between Vi-PDMS and Vi-PMVS and filler content on the properties of organsilicone encapsulant were discussed. The results show that when the ratio of between Vi-PDMS and Vi-PMVS is 5:5, the mass fraction of vinyl silane coupling agent is 4%, the mass fraction of MQ silicone resin is 30%, the mass fraction of compound flame retardant is 20%, the organsilicone encapsulant has optimum comprehensive performance. The mixed viscosity is 1 842 mPa·s, the tensile strength is 2.83 MPa, the elongation at break is 51.3%, the shear strength is 2.12 MPa, the flammability rating is UL 94 V-0, the dielectric strength is 24.3 kV/mm, and the volume resistivity is 3.8×1015 Ω·cm. The prepared organsilicone encapsulant could satisfy the development demands of electronic components.
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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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