Double coated insulated enameled wire is usually made of two layers of paint of different materials, a primer layer and a topcoat layer. The chemical composition of each layer of paint is different. The main ingredients used in the primer layer include polyurethane, polyester (including modified polyester), polyesterimine (including direct-weldable polyesterimide), etc.; the outer coating is selected according to the performance requirements and usage conditions, mainly polyester. Amide and polyamide-imide, polyvinyl butyral, epoxy and its modified resin, etc.” Generally, the paint film thickness of the outer paint is thinner than the bottom layer, about 25% to 30% of the total thickness. Usually some performance indicators of the outer paint are higher than those of the base paint, such as heat resistance and mechanical strength. The outer paint plays a protective role and enhances the overall performance of the insulation.
Compared with single-coated enameled wire, composite-coated enameled wire has the following advantages:
(1) Meet special use requirements, such as self-adhesive enameled wire for skeleton-free forming, refrigerant-resistant enameled wire for refrigerators, air-conditioning compressors, etc., which can be met by composite coating structures;
(2) Through the compounding of various insulation layers, the characteristics can be complemented, and the performance can be improved to meet the usage requirements. For example, the polyester/nylon composite coated enameled wire improves the thermal shock performance and winding performance, and is suitable for the hot dipping process. Can be used for motor windings that are instantly overheated due to overload;
(3) It can reduce the cost of some enameled wires. For example, polyesterimide and polyamideimide composite coated enameled wires can replace single-coated polyamideimide enameled wires, which can greatly reduce costs.
Thanks to the excellent comprehensive performance of composite insulated enameled wires, the proportion of composite coated enameled wires in various types of enameled wires has been increasing in recent years. In European and American countries, the proportion has reached more than one-third. In my country’s enameled wire market, it has also been steadily increasing year by year. , and the proportion of composite wires of aluminum winding wires has just reached more than 80%.
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