Abstract
It is of practical significance to prolong the service life of the silk screen plate used for screen printing by a simple method. To our knowledge, no attempt has been made to coat silk screen stencil film with polybenzimidazole (PBI) to improve its abrasion resistance against squeegee in order to prolong the service life of the silk screen plate. In this study, the synthesized PBI with 2,6-disubstituted benzimidazole structure was coated on the silk screen stencil film by solution casting, and its effect on the morphology, roughness and abrasion resistance of stencil film was investigated by scanning electron microscope, atomic force microscope and Taber abrasion tester. The abrasion resistance of the silk screen stencil films with 1 and 19 μm thick PBI coating is improved by 18.6% and 87.6% compared with that of pure stencil film, respectively. The stencil film undergoes two wear stages: the first stage with a larger mass loss is characterized by the wear of photosensitive film; and the second one with a relatively smaller mass loss is characterized by the wear of both photosensitive film and silk screen. The thickness of PBI coating has an important effect on the substrate strength and surface properties of films during the wear, thus resulting in changes in the abrasion resistance of stencil films. It shows that 8 μm thick PBI coating is enough to protect the stencil film from wear.
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