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varnished wire Different varieties of development
- Feb 23, 2018 -

1) acetal varnished wire.

Acetal enamelled wire is one of the earliest varieties in the world development, launched by Germany, the United States has 1930 respectively, the Soviet union also developing rapidly, which has two kinds of PVF and polyvinyl acetaldehyde, success is in the '60 s research in China.

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 [1].

2) polyester varnished wire.

By the west developed first in the '50 s with dimethyl terephthalate for polyester paint, since it has good heat resistance and mechanical strength, wide range of coating process, the price is low, since the 50 s became master of enameled wire main products of the market.

But due to poor polyester heat shock, under the condition of high temperature, high humidity is easy to hydrolysis, the late 70 s as a polyester coating enameled wire in west Germany and the United States is no longer production, and in Japan, China and southeast Asia are still a lot of the production and use.

The statistics of 1986 show that the output of polyester enameled wire in China accounts for 96.4% of the total output. After 10 years of hard work, the varieties of enameled wires have been developed, but the gap is very large compared with that in developed countries [1].

The domestic polyester modification has also done a lot of work,THEIC modification, the modification of amines has been studied and developed, but because of the slow adjustment of enamel-wire structure, the production volume of these two kinds of paints is still small.

So far, the problem of voltage drop of modified polyester enameled wires still needs to be taken seriously [1].

3) polyurethane enameled wire.

Polyurethane enameled wire paint was developed by bayer in 1937 and is widely used in fields such as electronics and electrical appliances because of its direct weldability, high frequency resistance and dyeing properties.

At present, the heat resistance level of polyurethane enameled wire is not affected by foreign countries.

In Europe, the United States, Japan has developed the F class, H class polyurethane enameled wire.

Due to the rapid development of color TV, the color TV FBT developed in Japan has attracted the attention of all countries around the world with the large length of the polyurethane enamelled wire with no salt water pinhole [1].

The development of domestic polyurethane enameled wire is slow. Although the common polyurethane paint is produced in some factories, it is mainly imported because of poor workmanship and surface quality.

F - grade polyurethane has been developed in China, but it has not formed production capacity.

The large length of non - pinhole polyurethane paint has been developed successfully and has been put on the market, mainly for the production of black and white TV set FBT coils [1].

4) polyester amide varnished 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, it has also developed the direct welding polyester imine enameled wire, which has been widely used in the winding of small motor, simplified the welding process, and reduced the manufacturing cost of the motor.

Some Japanese also use straight - solder polyester as a color deflecting coil to use self - adhesive enameled wire primer to simplify the process.

Domestic polyester imide paint has imported from Germany and Italy the manufacturing technology, has successfully developed by oneself, but due to the instability of raw materials and other reasons, the current domestic extensive used as refrigerant resistant composite of polyester imide enamelled wire primer paint still rely on imports.

Only a small number of single-coated polyester enameled wires are used in domestic paint, but the voltage instability is still a concern in the production plant. The direct soldering polyester imine paint has been developed successfully by the cable institute [1].

5) polyimide varnished 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 by the United States in 1958.

Polyimide enamelled wire has high heat resistance, good solvent and refrigerant properties.

However, due to its high cost, poor storage stability and toxicity, it is widely used.

At present, it USES some special occasions, such as coal mine motor, space instrument and instrument, etc. [1].

6) polyamide imide paint.

Polyamide-imide lacquer is the most comprehensive in lacquer enamel, with high heat resistance, mechanical properties, refrigerant properties and chemical resistance, so it is the best name for enameled lacquer.

The paint is mainly used for its unique properties, which is widely used as the coating of composite coating enameled wire, to improve the heat resistance and reduce the cost of the composite line.

At present, it is mainly used for the coating of the refrigerant enameled wire, which is produced in a small amount in China, mainly imported from America, Italy and Germany [1].

7) composite coating varnished wire.

The composite insulation layer is generally used to improve the temperature resistance grade and develop special use enameled wires.

Composite coating enameled wire compared with single coating enameled wire has the following advantages: (1) meet the special requirements, such as complex frameless forming with self-adhesive enameled wire, such as refrigerator, air conditioner compressor with refrigerant resistant enameled wire can meet by composite coating structure;

(2) through a variety of insulation composite features complement each other, improve and enhance the use of performance, in order to meet the application requirements, such as polyester/nylon composite coating enameled wire can improve the thermal shock performance and winding resistance, suitable for hot dip process, can be generated due to overloading overheating of motor winding is used;

(3) the cost of certain enameled wires can be reduced, such as polyester, polyamide-imide composite coating enameled wire instead of single coated polyamideimide enameled wire [1].

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