Food packaging is the most important output of the printing industry. Giving antibacterial effect to the papers used in food packaging will extend the shelf life of the product and food transfer in healthier conditions. The nanoparticles with known antibacterial activity are nanosilver, nanogold, nanosilica. Binders used in paper coating provide a good nutrient medium for bacteria. In this study, Ag nanoparticles was first synthesized as monodisperse in 10 nm size with polyvinyl pyrrolidone and sodium boron reaction which will give antibacterial properties to paper coatings. The chemical structure of the synthesized Ag nanoparticles is illuminated by fourier transform infrared spectrophotometer (FTIR). Different paper coating formulations containing varying amounts of Ag nanoparticles were prepared with starch binder. Using these mixtures; papers coated with a laboratory-type paper coating machine onto 80 g/m2 paper. Color, gloss, contact angle, surface energy, antibacterial properties of the paper against the E. coli bacteria and S. aureus bacteria were examined. As a result, Ag nanoparticles has been successfully synthesized and used in paper coating. Antibacterial and printability properties were improved by increasing the amount of Ag nanoparticles.
Introduction: Paper is the most important material of the printing industry and is being improved due to the increasing needs of industry. The most important process to improve the optical and physical properties of paper is the surface coating. Paper has a smoother and opaquer surface with surface coating. In addition, brightness, whiteness, and yellowness values are improved with surface coating. Ultraviolet (UV) light in sunlight causes changes in the structure of the paper and coating chemicals and accordingly causes yellowing. Para-amino benzoic acid (PABA), due to its chemical structure, is a UV-blocking agent used in sunscreen creams. Methods: The effect of PABA on paper gloss, yellowness, and lightfastness values was investigated by adding it into the surface coating formulation. For this purpose, coating formulations were prepared with cationic starch and 3%, 5%, and 7% PABA; coatings were applied to the paper according to laboratory condition standards. Coated papers were printed with an IGT-C1 lab-type offset printability device with magenta ink. The printed papers were then exposed to a light fastness test with Solarbox. The color, brightness, and yellowness values of all samples before and after lightfastness were measured with an X-Rite spectrophotometer. The gloss of coated and printed paper sample values was measured with a BYK-Gardner glossmeter. Results: The gloss values of paper to which PABA was added, increased; however, it was determined that these gloss values decreased after the lightfastness test. Conclusions: PABA-added cationic starch coatings are more affected by UV light than cationic starch coatings.
Block polymers are used frequently in medicine, nanotechnology, paint, cosmetic and many other fields. Generally, one of the blocks produced is hydrophilic and the other hydrophobic. With amphiphilic polymers, molecules in the lipophilic structure can be encapsulated. Encapsulation is being used industrially for the reason that it is easier to transport a substance chemically without deterioration and is less affected by environmental effects. Amphiphilic block copolymers composed of hydrophilic and hydrophobic monomer units are used in micellization. Copolymers can form different morphological structures, which can be repeated under controlled conditions, depending on the composition of the block copolymer in the aqueous medium, the concentration of the copolymer in the medium, the interactions between the hydrophilic chains forming the shell, the addition of the acid, base or salt, the organic solvent used, the polarity of the solvent used and the relative solubilities of the blocks in the solvent. In these systems, while the core acts as a repository that allows the active substances to be dissolved, the shell part provides the hydrophilic property to the whole system. With amphiphilic polymers, molecules in the lipophilic structure can be encapsulated. In the first part of this work, stearic acid substituted polyvinyl alcohol-hydrophilic lipophilic polymer was synthesized with acidic esterification reaction and the chemical structure of the polymer enlightened with ATR-FTIR. 1 H-NMR method was used to determine the composition ratio of the polymer. In the second part of the study, lavender oil was added to the obtained polymer system and encapsulation was carried out after the interaction of the lavender oil and lipophilic end of polymer. The obtained capsule size analysis was performed by SEM. At the end of the work, paper coating formulations were prepared with microcapsules containing lavender oil and coated on standard office paper. The color and gloss properties of the coatings are measured. The results showed that the stearic acid substitute PVA polymer could be used in lavender oil encapsulation and made a suitable encapsulation for paper coatings.
Due to the high flammability of the paper, its use is restricted in advanced applications. In this study, UV-cured paper coating formulations containing silica nanoparticles and phosphinoxide were prepared and coated on paper surface. Flammability, wettability, and printability properties were investigated. For this purpose, the surface of the silica nanoparticles was first functionalized with hydroxyethyl methacrylate (HEMA) ─OH. The hydroxylated silica nanoparticles were then modified with isocyanatoethyl methacrylate. Bis fluoro phenylphosphine oxide was synthesized by Grignard reaction elsewhere and OH modified in basic medium. Acrylate groups were added to BHPPO with isocyanatoethyl methacrylate to make it suitable for UV-curing formulation. The chemical structures of the obtained substances were illuminated by ATR-FTIR. UV-cured paper coating formulations containing acrylated silica, acrylated phosphinoxide, and mixtures thereof were prepared and coated on the paper surface. Chemical structure, contact angle, surface energies, surface morphology, thermogravimetric analysis, and limited oxygen index of the coatings were determined. As a result, it has been concluded that coated papers have increased thermal stability in the nitrogen atmosphere. The highest thermal stability was observed in coatings containing nanosilica and it was determined that all of the coatings ignited later. Hybrid coatings made within the scope of this study have improved the printability properties as well as adding flame retardancy properties to the paper.
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