Bondable Magnet Wire - Polyvinylbutyral

 


Polyester-imide Bondable
Polyester-amide-imide Bondable
Solderable Polyester Bondable

 

Insulation Characteristics:

Bond Coat may be epoxy or polyester. The addition of the bond coat does add one overall build level to the wire dimension.

 

A bondable enamel coated, insulated electrical conductor such as magnet wire. The bondable electrical conductor is formed by a base insulation coating on a metallic conductor such as wire, the base coating being a thermosetting, resin enamel, and a bondable overcoat of polyamide-imide enamel applied on said base coating. The polyamide-imide enamel includes residual solvent so that the polyamide-imide enamel is self-bondable.

 

The bondable magnet wire produced as described above retains its desirable bondable characteristics even after storage at room temperature over a period of several months. It appears that the polymer coating retains its solvent under normal room temperature conditions, thus providing for a reasonable commercial shelf life. It has also been observed that the bondable wire does not self-bond during storage of spools of the bondable wire under ambient conditions, and special storage and handling conditions are not required.

 

Bonding Coats

Type
Bonding Temp. (°C)*
Operating Temp. (°C)**
Polyvinyl
110 - 140
105
Epoxy
150 - 200
130
Polyester
190 - 210
130
Aromatic Polyamide
200 - 230
175

* May Vary based on wire size and coil design

** Most room temperature bond strength loss at this point

 

Use of Bondable wire allows coils to be self-supporting, so that bobbins, taping, or additional varnishing is not necessary. Bondable wire consist of standard magnet wire insulations overcoated with a thermoplastic polymer that can be temporarily softened by either heat or solvent, or both.

Three Common Methods of Bonding

1. Solvent Bonding

Some Bondcoats can be activated by the application of certain solvents during or after coil winding. The solvent may be applied to the wire via a wick during the winding operation or the finished coils may be dipped in a bath of solvent after the winding process. In either case, the unit should be heated again to drive off residual solvent and to complete the bonding of coils.

2. Heat - Oven Bonding

After the coils are formed, the unit is heated in an oven, causing the bondcoat to flow, bonding the adjacent turns of wire together.

3. Heat - Resistance Bonding

Resistance heating in similar to oven heating, except that passing current through the formed coils supplies heat. Time, voltage and current are all unique to each application.

General Applications:

 

  • Helical
  • Toroidal
  • Brake
  • Clutch
  • Television
  • Yoke
  • Coils