Application and Performance Standard of Insulating Varnish
In industrial applications, various forms of insulating materials are often used, the most common of which are solid insulating materials. In addition, there are rare liquid insulators. Insulating paint, such as insulating paint, is a liquid insulating material. It is mainly used to impregnate the coils of electrical machines and electrical appliances and to fill their gaps and micropores. After the impregnated object is solidified, a flat paint film is formed on the surface to form a whole with the object, and the whole is insulated.
In the use of insulating paint, not any type of impregnating paint can play a better insulation effect. In order to achieve good insulation performance, the insulating paint must have the following performance standards:
1. Appearance: transparent and uniform liquid, without other impurities, the paint film is smooth and bright.
2. Viscosity: must be allocated to the appropriate viscosity to ensure that the coil can achieve the best penetration and the amount of paint when it is impregnated, and the amount of thinner can be determined according to the size of the coil, the gap of the coil and so on.
3. Drying time: in the actual production and use, only the insulating paint with fast drying speed and low curing temperature can be better used to improve the overall production efficiency.
4. Solid content: in any insulating paint, in order to neutralize its viscosity, a certain amount of solid material will be added. However, because of the existence of solid material, its volatility has been reduced, so the selection of insulating paint should be a good judgment to determine whether it affects the curing rate.
5. Flexibility: most of the insulation paint has a certain flexibility and adhesion, neither too brittle nor too crisp. Generally speaking, when the object is painted, the lacquer surface can not be cracked or shedding.
6. Dielectric properties: insulation paint must have high breakdown strength and volume resistivity.
7. Corrosion resistance: insulation paint also needs to have good solvent resistance, steam resistance and moisture resistance, salt spray resistance and thermal shock resistance, so as to prevent damage to insulating varnish and objects in use.