DELO, a leading manufacturer of industrial adhesives for the automotive, consumer electronics and semiconductor industries, has developed its first dual-curing, high-temperature adhesive for electric motor applications. DELO DUALBOND HT2990 is designed for use in multiple processes, including magnet bonding and magnet stacking in electric motor manufacturing.
With the increase in the production of electric vehicles, durable adhesives to bond electric motors, as well as efficient processes that help streamline production and meet high demand, are critical.
DELO insists “DUALBOND HT2990 is the first heat-resistant adhesive capable of light fixation. This supplemental means of curing helps electric motor manufacturers quicken assembly processes and optimise efficiency in their production, achieving light fixation in 5 – 10 seconds”.
In magnet bonding, while heat is the standard method of curing, complementing it with light fixation creates an already-cured outer layer that helps keep everything in place. The adhesive does not seep outside or onto the motor laminations. In magnet stacking, supplementing heat curing with light fixation allows the user to forego having to keep magnets under a jig in the oven to reach the desired bond line thickness.
DELO states final curing with heat takes 30 minutes at 150°C or 60 minutes at 130°C. If exposure to heat occurs later in electric motor assembly, for example via heat shrinkage, there is a possibility for the heat curing step to be skipped. Induction curing can also be another alternative to oven curing.
At room temperature, DUALBOND HT2990 can achieve a compression shear strength of up to 70 MPa on steel. It also has a high glass transition temperature of 165°C. In heat as extreme as 180°C, the adhesive exhibits a tensile shear strength of 7 MPa on aluminium.
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