New structural adhesive from Delo for magnet bonding has high temperature stability

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 degrees Celsius 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.

With this product, however, the company has developed a structural adhesive with a glass transition temperature (Tg) of +168 degrees Celsius, 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 degrees Celsius it acheives 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.

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 degrees Celsius 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 degrees Celsius 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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