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Extra resources for Adhesion and Bonding to Polyolefins (Rapra Review Reports)
The preferred commercial methods for pretreating different polyolefins can be summarised as follows: Polymer Pretreatment Method Film (PE, PP) Corona Bottles (PE) Flame Mouldings (PE, PP) Flame, plasma, primers EPDM Grafting, primers SBS, SBR TCICA Adhesion and Bonding to Polyolefins 7 Conclusions • • It is normally necessary to pretreat polyolefins to achieve satisfactory adhesion for bonding, printing, painting and metallising operations. In particular, it is necessary to introduce a small quantity of functional groups such as carbonyl into the polyolefin surface.
The treatment also produced a decrease in the TS and the EB of the rubbers. This indicated that the treatment with sulphuric acid was not restricted to the rubber surface but also produced a bulk modification. The sulphuric acid treatment increased the T-peel strength of two of the rubber/PU adhesive joints and produced a mixed failure mode (adhesion and cohesive failure in the rubber). 17 refs. 5 wt % trichloroisocyanuric acid(TCI) solutions in butanone. The durability of the effect of the halogenation treatment on the surface properties of the rubber was assessed using contact angle measurements, ATR IR spectroscopy and SEM.
In particular, it is necessary to introduce a small quantity of functional groups such as carbonyl into the polyolefin surface. An exception is where a very rough surface has been created permitting mechanical keying, for example, the treatment of polypropylene with a chlorinated solvent vapour. It is also not necessary to pretreat polyolefin surfaces if a diffusion mechanism operates. Thus it is possible to heat weld two pieces of the same polyolefin and sometimes two pieces of dissimilar, but compatible polyolefins.