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Thursday, February 9, 2012

Nitrile Rubber and Phenolic Resin Application

Read about Nitrile Rubber Resin:
Nitrile rubber/phenolic resin adhesive have been developed manily in the USA, where they have perhaps become more popular than in Europe. They have on average a rather lower tensile shear streangth than the polyvinyl acetal/phenolic resin adhesives, but somewhat higher strength especially at sub zero temperature.

According to the application, the recommended curing cycle is mainly 1/2 to 1 hour at 160 oC or one minute at say 240 oC and at a pressure from 50 to 200 psi.

Cold curing adhesive are available and are used for stricking leather, cellulosic materials and certain plastic, but there is little information available on joint strength. The part played by the phenolic resin, if uncured, is uncertain, however, the phenolic resin can be replaced by a resorcinol resin, with phenol formaldehyde made available from another source to effect cure. The cold curing systems, however, are not the type under consideration here.

The most important use as hot cured adhesives is in bonding metals, especially light alloys in aircraft construction, when the lower curing temperature is advisable. Value showing the tensile shear strenght/temperature relationship of four commercial forms of the adhesive (component ratio unkown) have been plotted from tables in the form of a graph. Here again it must be emphasized that in considering one particular property some regard should be given to all others.