Briefly introduce the electrical insulation properties of polyimide films
Polyimide film (PI film) is currently one of the high-performance polymer materials in the field of electrical insulation. Its core advantages in electrical insulation performance are reflected in the three dimensions of "high voltage resistance, extreme environment resistance, and strong stability", which can be briefly summarized as follows:
Polyimide film (PI film) is currently one of the high-performance polymer materials in the field of electrical insulation. Its core advantages in electrical insulation performance are reflected in the three dimensions of "high voltage resistance, extreme environment resistance, and strong stability", which can be briefly summarized as follows:
1. Excellent breakdown resistance: Under normal conditions, its volume resistivity can reach 10 ¹⁶ -10 ¹⁸Ω· cm, and its dielectric strength (voltage resistance) can reach 100-150 kV/mm, far exceeding ordinary insulation films (such as polyester films, which are about 100 kV/mm). It can block current leakage for a long time in high voltage environments and is suitable for high-voltage motors, capacitors, and other equipment.
2. Insulation stability in a wide temperature range: It can maintain stable insulation performance in the extreme temperature range of -269 ℃ (close to liquid nitrogen temperature) to 260 ℃ (short-term resistance above 400 ℃), with almost no significant fluctuations in dielectric constant (3.0-3.5, 1kHz) and dielectric loss tangent (<0.005, 1kHz), solving the problem of insulation failure of traditional insulation materials (such as epoxy resin) at high temperatures, and suitable for high temperature scenarios such as aerospace and military.
3. Strong resistance to environmental interference: It has both chemical corrosion resistance (acid, alkali, organic solvents) and radiation resistance (anti gamma rays, ultraviolet rays). In harsh environments such as humidity, oil pollution, and radiation, the insulation performance is not easily degraded or aged due to material degradation, and the service life can reach 10-20 years, far longer than ordinary insulation materials.
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