Enameled wire is an electrical wire made by copper covered wire with an enamel film.
1) Acetal enameled wire
Acetal enameled wire is one of the earliest varieties in the world. It was put on the market by Germany and the United States in 1930. The Soviet Union also developed rapidly. There are two types of polyvinyl formal and polyvinyl acetal. The research was successful in the years. Although the enameled wire has a low temperature resistance rating (105°C, 120°C), it is widely used in oil-immersed transformers due to its excellent high-temperature hydrolysis resistance. This feature has been notarized by countries all over the world. my country is still There is a small amount of production, especially the acetal enameled flat wire is used to make transposition wires, which are used in large transformers.
2) Polyester enameled wire
In the 1950s, West Germany first successfully developed a polyester enameled wire paint based on dimethyl terephthalate. Due to its good heat resistance and mechanical strength, the painting process is wide and the price is low. It became the main product dominating the enameled wire market. However, due to the poor thermal shock resistance of polyester enameled wires and easy hydrolysis under high temperature and high humidity conditions, polyester enameled wires as a single coating were no longer produced in West Germany and the United States in the late 1970s, but in Japan, China and Southeast Asia. Still mass-produced and used. Statistics in 1986 showed that the output of polyester enameled wire in my country accounted for 96.4% of the total output. After 10 years of hard work, the variety of enameled wire has been developed, but compared with developed countries, there is a big gap.
Domestic polyester modification has also done a lot of work, both THEIC modification and imine modification have been researched and developed, but due to the slow adjustment of the enameled wire structure, the current production volume of these two paints is still not large. So far, the voltage drop of modified polyester enameled wire still needs everyone's attention.
3) Polyurethane enameled wire
Polyurethane enameled wire paint was developed by Bayer in Germany in 1937. Because of its direct solderability, high frequency resistance and dyeability, it is widely used in electronics, electrical appliances and other fields. At present, foreign countries are paying great attention to improving the heat resistance of polyurethane enameled wire without affecting its direct welding performance. In Europe, the United States, and Japan, Class F and Class H polyurethane enameled wires have been developed successively. Due to the rapid development of color TVs, the large-length, salt-free pinhole polyurethane enameled wire developed by Japan for color TV FBT has attracted the attention of all countries in the world, and it is still the leader in Japan.
The development of domestic polyurethane enameled wire is slow. Although ordinary polyurethane paint is produced by some factories, due to problems such as poor workmanship and surface quality, the paint is mainly imported. Class F polyurethane has also been developed in China, but no production capacity has been formed. Large-length pinhole-free polyurethane paint has also been successfully developed and put on the market, mainly used to make FBT coils for black and white TV sets.
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