FAQ

At present, the application of magnet wire coating products has greatly increased the amount of magnet wire with the acceleration of my country's modern industrial construction and the rapid growth of export products. Enameled wire and magnet wire mainly use insulating electrostatic powder coatings. The insulating oxide film magnet wire treated with concentrated sulfuric acid of metal aluminum wire can also be applied to the enameled wire coated with insulating varnish. The following is an introduction to the application of magnet wire coating products: Because the coating thickness of general powder coatings is suitable for round wires with a diameter of more than 1.6mm or flat wires with a width × thickness of 1.6mm × 1.6mm or more, coating Insulation coatings with a film thickness of 40 μm or more cannot be used for coatings requiring thin coatings. If the ultra-thin powder coating is used, the thickness of 20-40 μm can be achieved, but due to the high cost of coating processing and the difficulty of coating, it cannot be widely used. When the thickness of the coating film is too thick, the flexibility and other functions of the coating film will be reduced, and it is not suitable for products with too large bending angle of the metal wire. Due to the limitation of film thickness, too thin metal wires are not suitable for powder coating technology.

With the acceleration of the pace of my country's modern industrial construction and the rapid growth of export products, the amount of magnet wire used in electromechanical, electronics, communications, automation control and other industries is increasing, and the requirements for product quality are also increasing. Environmental protection and improving production efficiency have also put forward more stringent requirements. However, at present, in the production process of the oxide film insulated aluminum wire magnet wire commonly used in the electromechanical industry, a large amount of concentrated sulfuric acid is used to treat the metal aluminum wire to obtain the oxide film insulation layer. Because this production process uses a large amount of concentrated sulfuric acid in production, a large amount of irritating gas is volatilized in the open production process. This irritating gas not only causes certain damage to the operator's nasal cavity, respiratory tract and skin, but also brings serious pollution to the production workshop and the surrounding environment. The wastewater produced in the production also needs to be treated strictly, otherwise it will cause serious pollution to the groundwater quality. In terms of production efficiency, only 10 (roots) aluminum wires can be processed at a time, and the processing speed is relatively slow. One of the biggest disadvantages of products produced by this treatment method is that the flexibility of the coating film is poor, and it is easy to damage the insulating coating film when bending or winding in the production of electromechanical products, thereby affecting the electrical insulation and product quality of electromechanical products; Of course, this product also has its advantages. The most important advantage is that the high temperature resistance of the treated film is very good.​​

In order to overcome the shortcomings of the production process of the oxide film insulating layer obtained by the treatment of aluminum wires with concentrated sulfuric acid, some domestic units have been engaged in the research and production of powder coatings for electromagnetic wires in recent years, such as Jiangsu Lanling Chemical Group Co., Ltd., Yangzhou Sanchuan Industrial Co., Ltd. , Henan Xuchang Huayuan Alumina Wire Factory, Henan Xuchang Huachuang Technology Industrial Co., Ltd. and other units have developed electrostatic powder coatings and coating processes for electromagnetic wires. Certificate No. 279269), "Electrostatic spraying powder coating for electromagnetic wire and enameled wire and its preparation process" (Patent Publication No. CN1908096A), "Production Method of Electromagnetic Wire" (Patent Publication No. CN1542870A) and other patents and patent publications have been published successively; Also applied for "electromagnetic wire and enameled wire with friction electrostatic spraying infrared curing powder coating and its preparation method and application" (patent application No. 200810196202, 2) and "electrostatic powder coating method of electromagnetic wire and enameled wire friction spray gun" (patent application No. 200810049916, 0) and other patents. At present, the insulating polyester epoxy powder coating for insulating electrostatic spraying magnet wire has won the title of high-tech new product in Jiangsu Province, and has also passed the appraisal of scientific research achievements and new products by Changzhou Science and Technology Commission and Economic and Trade Commission, and is widely used in industrial production. application. In addition, the electrostatic spraying polyester heat-resistant insulating powder coating for magnet wire and enameled wire has also been successfully applied to the magnet wire, replacing part of the aluminum magnet wire. aspect.

Enameled wire is a category of magnet wire, usually refers to the insulated wire used to manufacture coils or windings in electrical products. Also called winding wire.

Magnet wire must meet a variety of usage and manufacturing process requirements. The former includes its shape, specifications, can work at high temperature for short and long-term, and withstand strong vibration and centrifugal force at high speed in certain occasions, withstand corona and breakdown under high voltage, and chemical resistance under special atmosphere. Corrosion, etc.; the latter includes the requirement to withstand stretching, bending and abrasion during winding and embedding, as well as swelling, erosion, etc. during dipping and drying.

Magnet wires can be classified according to their basic composition, conductive core and electrical insulating layer. Generally, it is divided into enameled wire, wrapped wire, enameled wrapped wire and inorganic insulated wire according to the insulating material and manufacturing method used for the electrical insulating layer.

The enameled wire is made by coating the conductor with the corresponding paint solution, and then by solvent evaporation and paint film curing and cooling. Enameled wire can be divided into polyester enameled wire, polyesterimide enameled wire, polyamideimide enameled wire, polyimide enameled wire, polyesterimide/polyamideimide enameled wire, corona-resistant enameled wire, and oily enameled wire according to the insulating paint used. Paint, acetal paint, polyurethane enameled wire, etc. Sometimes it is also classified according to the particularity of its use, such as self-adhesive enameled wire, refrigerant resistant enameled wire, etc.

The early enameled wire was oily enameled wire, made of tung oil and so on. The paint film has poor wear resistance and cannot be directly used to manufacture motor coils and windings. It needs to be wrapped with cotton yarn when used. Later, the polyvinyl formal enameled wire came out, and its mechanical properties were greatly improved, and it could be directly used in motor windings, and it was called high-strength enameled wire.

With the development of weak current technology, self-adhesive enameled wires have appeared, which can obtain coils with better integrity without dipping and baking. However, its mechanical strength is poor, and it can only be used in micro motors and small motors. In addition, in order to avoid the trouble of removing the paint film first during welding, the straight-solderable enameled wire has been developed, and the coating film can fall off by itself in the high-temperature tin enamel bath, making the copper wire easy to weld.

Due to the increasingly wide application of enameled wires and the increasingly strict requirements, composite enameled wires have also been developed. The inner and outer paint films are composed of different polymer materials, such as polyesterimide/polyamideimide enameled wires.

Wrapped wire An important variety of winding wire. In the early days, cotton yarn and silk, called yarn-covered wire and silk-covered wire, were used in motors and electrical appliances. Due to the large insulation thickness and low heat resistance, most of them have been replaced by enameled wires. Currently only used as high frequency winding wire. In the large and medium-sized winding wires, when the heat resistance level is high and the mechanical strength is high, the glass wire wrapped wire is also used, and the appropriate adhesive paint is used during manufacture.

Paper-covered wire still occupies a considerable position in the wrapped wire, mainly used in oil-immersed transformers. The oil-paper insulation formed at this time has excellent dielectric properties, low price and long service life.

In recent years, film wrapping wire has developed rapidly, mainly including polyester film and polyimide film wrapping wire.Recently, there is also a mica tape-coated polyesterimide film wrapped copper flat wire for wind power generation.

Inorganic insulated wire When the heat resistance level exceeds the limit of organic materials, it is usually coated with inorganic insulating paint. Existing inorganic insulating wires can be further classified into glass film wires, oxide film wires and ceramic wires.There are also combination wires, transposed wires, etc.

As a representative product of magnet wire, copper-clad aluminum wire is a bimetallic composite wire that is combined with copper layers on the aluminum core. Reasonable use of the properties of different metals, so as to achieve the characteristics of reducing production costs and facilitating engineering construction.

Copper-clad aluminum wire is used in the cable television industry, and copper-clad aluminum wire has become the standard material for coaxial cables in the United States. Because the high-frequency signal transmission runs on the outer layer of the wire, the copper-clad aluminum wire can replace the copper wire of the same specification. In low-frequency applications, the load capacity of copper-clad aluminum is 65% of that of copper wires of the same specification. Because of its light weight, it is softer than copper when large wire sizes are required. Copper-clad aluminum is used for battery cables, welding cables, Building cables and electromagnetic wires are also the best wire materials.

Compared with pure copper wire, copper-clad aluminum wire has the advantages of good electrical conductivity and light weight, which is economical, and has good flexibility during construction and is easy to operate. The length ratio of the same wire weight is 2.45:1, so buying 1 ton of copper-clad aluminum wire is equivalent to buying 2.45 tons of pure copper wire, which has the advantage of saving costs.

Compared with pure aluminum wire, copper-clad aluminum wire has high electrical conductivity, and also increases tensile strength and elongation. The solderability like copper wire greatly increases the mechanical properties and applicability of the product.

How to remove paint for magnet wire enameled wire, we can roughly divide it into the following three methods according to different conditions, equipment and needs.

1. For ordinary thin wires, it can be directly tinned when placed on a soldering iron at 400 degrees Celsius. For thick wires, we do not recommend the method of fire roasting, which will make the magnet wire oxidize and affect its properties, and even if it is reluctantly completed in time, it will be found that there will be some pores on the surface of the tin.

2. We can also apply rosin on the broken end of the enameled wire, and put the section into the soldering iron to melt tin. The section has no paint, so it will be tinned quickly, and the surrounding area will also increase with the temperature without adhesion. Remove the paint and tin, we just need to control the temperature.

3. Here we recommend the third type of paint. Qualified paints do not damage or corrode the metal. They can remove the paint on the surface of the electromagnetic wire. There are bad consequences or residues on the wire surface. The core wire has excellent weldability after removing the paint. Now many industrial manufacturing sites use this method for batch processing. Now it has replaced the old method of scraping and burning with a knife, and the cost is leaping.