Enameled wire insulation paint
Insulating paint is composed of three parts of paint base (natural or synthetic resin, asphalt, drying oil, fiber paper and its composites, etc.), solvent or diluent, and auxiliary materials (drier, pigment, emulsifier, antifungal agent, etc.) . According to the purpose, it can be divided into three types: dipping paint, covering paint and adhesive paint.
(1) Impregnating paint
Impregnating varnish is used to impregnate motor windings and fiber materials to improve the electrical performance, thermal conductivity, heat resistance, humidity resistance and integrity of the winding. For this reason, the impregnating varnish is required to have suitable viscosity, high solid content, good adhesion, not to be harmful to copper or other materials, and to have the ability to dry quickly. When used for the rotor, the paint should not be thrown due to heat during operation. In the past, oily asphalt paint was used to impregnate motor stator windings.
(2) Cover paint
Covering paint is also called coating paint or brushing paint. It is applied to the insulating surface that has been immersed to form an insulating paint film with good mechanical properties, smoothness and water resistance, which increases moisture resistance and prevents air and dust. Dirty and chemically active substances affect insulation The role of. Enameled wire paint, silicon steel sheet paint and semi-conductive paint are special covering paints. The requirements for the covering paint are mainly high viscosity, high solid content, good mechanical strength, and a smooth surface after drying.
(3) Adhesive paint
Adhesive paint is used to bond various insulating materials, such as mica, paper, cloth, etc. In addition to electrical performance, it must have strong adhesion. The adhesive paint used for soft mica tape is usually oil-based asphalt paint, oil-modified alkyd paint and epoxy polyester paint.