Magnetics Business & Technology - May/June 2019 - 9

FEATURE ARTICLE

New Structural Adhesive from Delo for Magnet Bonding has High Temperature Stability
With this product, however, the company has developed a structural adhesive with a glass transition temperature (Tg) of +168
°C, according to Karl Bitzer, responsible for product management at DELO. As a result, the Young's modulus below Tg does
not change significantly, the adhesive achieves a very high
temperature stability and the flexibility only increases above
this temperature. On sand-blasted aluminum and at +150 °C it
achieves a strength of 18 MPa. This is up to three times higher
than that of standard epoxy resins, he said.
Further, explained Bitzer, it shows very good adhesion to metals
as well as to temperature-resistant plastics, ferrite compounds
and ceramics. At room temperature, for example, it achieves a
compression shear strength of 65 MPa on aluminum and 55 MPa
on ceramics.

DELO has developed a new structural adhesive that achieves
up to three times the strength of its predecessor products at high
temperatures. DELO Monopox HT2860 can also be inductively
cured, which significantly accelerates manufacturing processes.
Among other applications, the epoxy resin is used in magnet
bonding in electric motors.
With many epoxy resins, temperatures of +150 °C and more
lead to a change in the polymer structures and thus to a drop
in performance. The elasticity also often increases above this
temperature range.

The adhesive is heat-cured in an oven or by induction. The latter requires metal joining partners and enables a reduction in
process times by up to 90 %, whereby the adhesive achieves the
same high strength as with standard curing at +150 °C and 40
minutes in the convection oven.
Another advantage of the new adhesive is that its containers can
be processed in the production line at room temperature for four
weeks before heat curing. It has a temperature range of use of
-55 to +220 °C and is suitable for bonding under high static or
dynamic loads such as in the automotive industry when bonding
magnets in electric motors.

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08/11/12 09:49

May/June 2019 * Magnetics Business & Technology

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Magnetics Business & Technology - May/June 2019

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