engleski

Changes in Color and Drying Time of Modified Polyvinyl Acetate Adhesive with Nanoparticles

Adhesive bookbinding is growing in popularity due to advancements in adhesive binding technology, shorter delivery time and the introduction of innovative materials. It is suitable for medium volume books and enables the production of durable and flexible end-products in accordance with today’s market needs, such as smaller product volumes and personalized consumer requirements. Polyvinyl acetate (PVAc) adhesives are widely used adhesives in the printing industry for paper, board, leather and cloth. In addition, water-based PVAc adhesives are more environmentally acceptable, compared to used hotmelts. In order to improve PVAc limiting and retain its existing positive properties, numerous studies dealing with modification of PVAc adhesives have been carried out. The aim of this research was to investigate the impact of PVAc modification with SiO2 and TiO2 nanoparticles on the end-product appearance and the productivity of the production process, more precisely change in color and drying time. Colorimetric values of dried PVAc and nano-modified PVAc adhesive films were measured on five different paper substrates, according to ISO 11475:2017 standard, in order to calculate the total color difference (CIEDE2000). Results showed that the color difference between dried PVAc and nano-modified PVAc films is not recognizable by a standard observer, but it is slightly larger with TiO2. The drying time of PVAc and nano-modified PVAc adhesive films was observed over a period of 60 minutes. Adhesives were applied on transparent foil and observed under UV light in a Judge II X-rite lightbox. Results showed that nano-TiO2 PVAc adhesive has much shorter drying time. According to obtained results it can be concluded that both types of nano-modified PVAc adhesives, as well as the original PVAc, are suitable for the production of end-products with a visible adhesive line. By adding TiO2 nanoparticles the productivity of the production process can be improved due to reduced drying time.

adhesive color ; adhesive drying time ; nanoparticles ; polyvinyl acetate ; short-run products

The conference fee was founded by the University of Zagreb, a grant under the title: “Characterization, durability and sustainability of advanced graphic materials and packaging”.