High Quality Copper Conductor Material And Solid Conductor Type Enameled Copper Wire
Type and purpose of enamelled wire: 1) acetal enameled wire Acetal enameled wire is one of the earliest developed varieties in the world. It was put into the market in Germany and the United States in 1930. The Soviet union also developed rapidly, and there were two kinds of polyvinyl...
Type and purpose of enamelled wire:
1) acetal enameled wire
Acetal enameled wire is one of the earliest developed varieties in the world. It was put into the market in Germany and the United States in 1930. The Soviet union also developed rapidly, and there were two kinds of polyvinyl formaldehyde and polyvinyl acetal.
The enameled wire is low heat resistance level (105 ° C to 120 ° C), but because of its excellent high temperature hydrolysis resistance and extensive used in oil-immersed transformer, this feature with the notarization in countries around the world, there is still a small amount of production in our country, especially the acetal paint BaoBian line used to make transposed conductor, used in large transformer.
2) polyester enameled wire
In the 1950s, dimethyl terephthalate (dimethyl terephthalate) was first developed in the west Germany, based on polyester enameled wire. Due to its better heat resistance and mechanical strength, wide range of paint making process and low price, it has been the main product dominating the enameled wire market since the 1950s.
However, due to the poor impact resistance of polyester enameled wire and its hydrolysis under high temperature and humidity, polyester enameled wire, as a single coating, was no longer produced in west Germany and the United States in the late 1970s, while in Japan, China and southeast Asia, it is still widely produced and used.
The statistics in 1986 showed that the output of pet enameled wire in China accounted for 96.4% of the total output. After 10 years of efforts, the variety of enameled wire has been developed, but there is a large gap compared with developed countries.
A lot of work has been done on polyester modification in China. THEIC modification and imine modification have been studied and developed, but the production of these two types of paint is still not large at present due to the slow structural adjustment of enameled wire.
So far, the voltage drop problem of modified polyester enameled wire still needs to be paid more attention.
3) polyurethane enameled wire
Polyurethane enameled wire coating was developed and developed by bayer in Germany in 1937. It is widely used in the fields of electronics and electrical equipment because of its direct welding, high frequency resistance and dyeing properties.
At present, foreign countries pay great attention to improving the heat resistance of polyurethane enameled wire without affecting its direct welding performance.
In Europe, the United States, Japan have developed F - class, H - class polyurethane enameled wire.
Due to the rapid development of color TV, the FBT made in Japan has attracted the attention of all countries in the world with a large length of non-saltwater pinhole polyurethane enameled wire.
The development of domestic polyurethane enameled wire is slow, although general polyurethane lacquer has a few factories to produce, but because craft sex is bad, the problem such as surface quality, because this lacquer basically relies on import.
F grade polyurethane has also been developed in China, but has no production capacity.
The large-length pinhole free polyurethane paint has also been developed and put on the market, mainly used for making the FBT coil of black and white TV.
4) polyester imide enameled wire
Because of polyester imide were modified and improved heat resistance, since the 70 s, the dosage of the polyester imide enameled wire has risen sharply in the world, in Europe and the United States the enameled wire has been fully replace single coating polyester enameled wire, the world's representative for the German Terebe FH series products and Isomid series products in the United States.
At the same time, direct welding polyester - imide enameled wire has been developed. It has been widely used as winding of small motor.
Some Japanese also use direct welding polyester imide paint as primer for color TV deflecting coil self-adhesive enameled wire, which simplifies the process.
The domestic polyester imide paint has introduced manufacturing technology from Germany and Italy successively, but due to the instability of raw materials and other reasons, at present, a large number of polyester imide paint used as the primer for the composite paint of refrigerant still relies on imports.
Only a small number of single-coated polyester imide enamels are applied with domestic paint, but voltage instability is still a concern for manufacturers. Direct welding polyester imide enamels have been developed successfully by the cable research institute.
5) polyimide enameled wire
Polyimide is one of the organic heat rank highest in the class enameled wire enameled wire paint, the long-term use of temperature can reach more than 220 ° C.
The paint was developed in the United States in 1958.
Polyimide enameled wire has high resistance to heat, solvent and refrigerant.
However, due to its high cost, poor storage stability and toxicity, it has been widely used.
At present, the enamelled wire is used for some special occasions, such as coal mine motor, cosmic space instrument and instrument.
6) polyamide-imide lacquer
Polyamide-imide lacquer is a kind of paint with high heat resistance, mechanical property, freezing resistance and chemical resistance.
This paint mainly applies its unique properties at present, and is widely used as the finishing coat of composite coating enamels, to improve the heat resistance of composite coating and reduce the cost.
At present, the main purpose of China is to use it to coat the paint wire of cryogenic agent. This paint is produced in a small number in China and mainly imported from the United States, Italy and Germany.
7) enameled wire of composite coating
The composite insulation layer is generally used to improve the temperature resistance and develop special enameled wire.
The composite coating enamelled wire has the following advantages over the single coating enameled wire :(1) it meets the special application requirements, such as self-adhesive enameled wire for complex frameless forming, and it can be satisfied by the composite coating structure for refrigerator and air conditioner compressor.
(2) through the composite of various insulation layers, its characteristics can be improved and its service performance can be improved to meet the requirements. For example, enameled wire of polyester/nylon coating can improve the thermal shock performance and winding performance.
(3) it can reduce the cost of some enameled wire, such as polyester imide and polyamide-imide composite coating enameled wire to replace the single-coated polyamide-imide enameled wire, which can greatly reduce the cost.