Polyurethane adhesive can replace epoxies

Intertronics believes its single-part adhesive could replace expoxies.
Polytec PU 1000 is a single-part adhesive which cures quickly at room temperature to a flexible, electrically conductive polymer. It can replace traditional, rigid epoxies, says Intertronics, which require thermal processing. The resulting production efficiencies enable new applications where pliability and conductivity is important.

The electrically conductive polyurethane addresses applications in die attach, bonding components in hybrid circuit applications and surface mount technology. these are areas where silver filled electrically conductive adhesives have traditionally been used. Usually such adhesives are epoxy-based, two-component or premixed and frozen single-component systems, but now the polyurethane option provides a flexible bond and cost savings as well as performance advantages in the production process, claims the company, when compared to a standard two-part conductive epoxy adhesive. The simplicity of the one-part application, without mixing, and an indefinite pot life with rapid cure at room temperature, e.g. 10 minutes at 23°C compared to 15 minutes at 120°C for a typical two- part epoxy, are other benefits.

The single-component, silver filled, paste adhesive can be both stored at room temperature and cured quickly at room temperature. It is flexible and elastic, which makes it suitable for bonding flex-circuits, temperature-sensitive substrates or substrates with highly dissimilar co-efficients of thermal expansion. It has found applications in smartcards and RFID circuitry, where cure can be effected in seconds. Other, potential uses are in wearable technology - clothing and accessories incorporating computer and advanced electronic technologies.

It is suitable for electrically conductive bonding and coating applications on absorbing substrates like fabric, paper, leather, cork and non-absorbing substrates like glass, ceramics, PMMA, metals and most plastics.

Caroline Hayes

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I have seen a number of articles on this adhesive material but there is no inforation on the lifespan of the cured material. Does anyone know what if any degradation occurs to the cured polymer and over what period?

Comment Graham Lowe, 15/03/2016

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