INVESTIGATION OF THE FLAME-RETARDANT PROPERTY OF SILICA NANOPARTICLES RATIO IN THE PAPER COATING
Papers have a highly flammable property and can easily catch fire. This is a major disadvantage for paper and paper packaging materials. For this reason, this can be delayed or prevented by producing papers with high heat resistance. For this purpose, coating formulations containing 1%, 2.5%, 5% and 10% silica nanoparticles were prepared and applied on 80 g/m2 office paper. Chemical analyses of the coatings were made with ATR-FTIR. Surface contact angle and surface energy properties of coatings were measured using PocketGoniometer PGX+, gloss measurements of coated papers were carried out with BYK Gardner GmbH micro gloss and color measurements were determined using X-Rite eXact spectrophotometer. Also, absorbency, surface morphology, and limited oxygen index (LOI) of the coatings were determined. All papers were printed with Toyolife LF - 1600 process magenta commercial offset printing ink using an IGT C1 offset printability test device. As a result, it was determined that the contact angle increased and the printability improved. It has been observed that silica nanoparticles coated papers have flame retardant and very good hydrophilicity and their printability values are in accordance with ISO 12647-2.