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On the basis of the film-making data of the 300 mm wide polyimide casting test line and the 1 200 mm wide polyimide biaxial stretching production line of Guilin Electrical Research Institute Co., Ltd., the effects of formulation, equipment, process, and other factors on the preparation of high thermal conductivity insulating polyimide films were investigated. The results show that compared with the biaxial stretching method, the casting method has advantages such as low trimming loss, simple equipment and process, excellent film-forming properties, lower cost, and good thermal conductivity of prepared films. In terms of improving the thermal conductivity of thermal conductive films, it is necessary to overcome the problems such as difficulty in peeling the casting film from steel belt, increased difficulty in filler dispersion, poor interfacial matching between filler and resin, and decreased film-forming continuity when boron nitride is highly filled.
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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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