| abstract |
The present invention provides a resin casting that can be firmly bonded to a metal member in a normal state and can easily separate a thermosetting resin when discarded. An insulating varnish comprising a metal member of a central conductor 1 constituting a main circuit, a surface of the central conductor 1, an epoxidized lignin, a curing agent such as dicyandiamide, and a solvent such as methyl cellosolve. The lignin adhesive layer 2 is provided by coating, and the insulating layer 3 is provided by molding a thermosetting resin such as an epoxy resin around the lignin adhesive layer 2. [Selection] Figure 1 |