Insulating medium capable of improving vacuum surface flashover voltage and preparation method of insulating medium
A surface flashover and insulating medium technology, applied to insulators, organic insulators, circuits, etc., to achieve the effects of low process difficulty, improved pulse and high reliability
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Embodiment 1
[0030] Embodiment 1: First, put the weighed raw materials (low-density polyethylene and phenolphthalein powder) into an oven for drying, the temperature is set at 60° C., and the time is 12 hours; after drying, put the low-density polyethylene into Heat and stir in a torque rheometer until it reaches a molten state, set the temperature at 135°C, and rotate at 60 rpm; after the low-density polyethylene is melted, add phenolphthalein powder, melt and blend for 30 minutes, and then extrude the low-density polyethylene composite material After the material is cooled, the low-density polyethylene composite material is hot-pressed in a flat vulcanizer at a temperature of 130°C to form a sample plate with a thickness of 5mm; the sample plate is machined to prepare A circular sample with a diameter of 25 mm.
Embodiment 2
[0031] Embodiment 2: First, put the weighed raw materials (low-density polyethylene and phenolphthalein powder) into an oven for drying, the temperature is set at 50° C., and the time is 12 hours; after drying, put the low-density polyethylene into Heat and stir in a torque rheometer until it reaches a molten state, set the temperature at 125°C, and rotate at 60 rpm; after the low-density polyethylene is melted, add phenolphthalein powder, melt and blend for 50 minutes, and then extrude the low-density polyethylene composite material After the material is cooled, the low-density polyethylene composite material is hot-pressed in a flat vulcanizer at a temperature of 150°C to form a sample plate with a thickness of 5mm; the sample plate is machined to prepare A circular sample with a diameter of 25 mm.
Embodiment 3
[0032] Embodiment 3: First, put the weighed raw materials (low-density polyethylene and phenolphthalein powder) into an oven for drying, the temperature is set at 80° C., and the time is 11 hours; after drying, put the low-density polyethylene into Heat and stir in a torque rheometer until it reaches a molten state, set the temperature at 145°C, and rotate at 40 rpm; after the low-density polyethylene is melted, add phenolphthalein powder, melt and blend for 40 minutes, and then extrude the low-density polyethylene composite material After the material is cooled, the low-density polyethylene composite material is hot-pressed in a flat vulcanizer at a temperature of 140°C to form a sample plate with a thickness of 5mm; the sample plate is machined to prepare A circular sample with a diameter of 25 mm.
[0033] Take the round sample prepared in Example 1 as an example:
[0034] Table 2 shows the crystallinity and spherulite size of pure LDPE samples and different types of LDPE ...
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