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Structural adhesive has high temperature stability and inductive curing

New Products |
By Nick Flaherty

DELO’s Monopox HT2860 can also be inductively cured, which significantly accelerates manufacturing processes. Among other applications, the epoxy resin can be used for bonding magnets 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 HT2860 material has a glass transition temperature (Tg) of +168 °C. 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.

The adhesive 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 °C and 40 minutes in the convection oven.

Another advantage of the new structural adhesive is that the adhesive 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. This is for example the case in the automotive industry when bonding magnets in electric motors.

www.delo.de

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