Abstract
Post press processes include various types of bonding and adhesives, depending upon the nature of adherends, the end use performance requirements and the adhesive bonding processes. Polyvinyl acetate (PVAc) adhesive is a widely used adhesive in the graphic industry for paper, board, leather and cloth. In this study, the enhancement of PVAc adhesion performance by adding different concentrations (1%, 2% and 3%) of silica (SiO2) and titanium dioxide (TiO2) nanoparticles was investigated. The morphology of investigated paper-adhesive samples was analyzed by SEM microscopy and FTIR spectroscopy. In addition, the optimal adhesion at the interface of paper and adhesive was found according to calculated adhesion parameters by contact angle measurements (work of adhesion, surface free energy of interphase, wetting coefficient). According to obtained surface free energy (SFE) results, optimum nanoparticles concentration was 1%. The wettability of the paper-adhesive surface and low SFE of interphase turned out as a key for a good adhesion performance. The end use T-peel resistance test of adhesive joints confirmed enhancement of adhesion performance. The highest strength improvement was achieved with 1% of SiO2 nanoparticles in PVAc adhesive.
Highlights
Adhesives are non-metal materials that are used to join two or more components together through attractive forces acting across the interface
Uniform nanoparticles dispersion and effective mixing approach was confirmed with SEM microscopy and Fourier Transform Infrared (FTIR) spectroscopy characterization
Almost the same characteristic vibrations and peaks were identified for the FTIR spectra of paper with Polyvinyl acetate adhesives (PVAc) and for paper with nano-enhanced adhesives, without any significant differences in regard to the concentration of nanoparticles
Summary
Adhesives are non-metal materials that are used to join two or more components together through attractive forces acting across the interface. Selection of adhesive type and form depends upon the nature of the adherents, the end use performance requirements and the adhesive bonding processes [1,2,3]. Especially post press processes, include various types of bonding and adhesives. There is no unique adhesive that can fulfil all post press graphic applications and it is usually necessary to compromise when selecting a practical adhesive system [4]. PVAc is water-based adhesive and it is considered more environmentally acceptable compared to solvent-based adhesives. Current guidelines for development of adhesive technology are focused on replacing the solvent-based adhesives with water-based, as well as achieving comparable or better quality of adhesive joints for particular application [6]
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