First dual-curing high-temperature structural adhesive for electric motors

DELO has created its first dual-curing, high-temperature adhesive for electric motor applications. DELO DUALBOND HT2990 is intended for usage in multiple processes, including magnet bonding and magnet stacking in electric motor manufacturing.

With the growth in the production of EVs, durable adhesives to bond electric motors and efficient processes that help streamline production and fulfil high demand are critical. That is why the company has developed DELO DUALBOND HT2990.

It is the first high-temperature-resistant structural adhesive capable of light fixation. This supplemental means of curing allows electric motor manufacturers to quicken assembly processes and optimise efficiency in their production, executing light fixation in five to ten seconds.

In magnet bonding, while heat is the standard method of curing, complementing it with light fixation produces an already-cured outer layer that helps hold everything in place. The adhesive does not seep outside or onto the motor laminations. In magnet stacking, supplementing heat curing with light fixation allows users to forego having to keep magnets under a jig in the oven to achieve the desired bondline thickness.

Final curing with heat takes 30 minutes at 150C or 60 minutes at 130C. If exposure to heat occurs later in electric motor assembly, for example, through heat shrinkage, there is a possibility for the heat curing step to be skipped. Induction curing can be another alternative to oven curing, too.

The adhesive can accomplish a compression shear strength of up to 70MPa on steel at room temperature. This compares to 45MPa achieved by standard high-performance heat-curing epoxies. It also has a high glass transition temperature of 165C. In heat as extreme as 180C, it still displays a tensile shear strength of 7MPa on aluminium. This is equivalent to 70kg/cm² of force, an extremely secure bond.

The company is providing a free webinar, 'High-Temperature Adhesives', on July 19, 2023, at 11:00 a.m. CET to learn more about adhesive and its applications. Industry experts will offer insight into electric motor applications and how high-temperature adhesives, such as DELO DUALBOND HT2990, can help optimise these processes, with some being able to withstand up to 20,000 hours of exposure to extreme heat.