THE USE OF ENCAPSULATED AMMONIUM POLYPHOSPHATE IN THE PRODUCTION OF FLAME RETARDANT PAPER
Papers have extreme burning and ignition properties due to their natural extractsToday, it has become a necessity to provide late flammability properties to valuable papers such as money, checks, promissory notes. It is desired that the additives used to provide late flammability materials do not emit harmful gas. In this sense, the use of additives containing phosphate is increasing. Encapsulation allows a material to be protected by natural effects or to be dispersed more homogeneously in the dispersion medium. In this study, ammonium polyphosphate, known for its flame retardancy property, was encapsulated with an easy method and it was investigated whether it provides a late flammability feature on papers.
For this purpose, microencapsulated ammonium polyphosphate was prepared by in situ polymerization with glycidyl methacrylate (GMA) and polyurethane as the shell material, respectively. The chemical structure of microcapsules illuminated with Fourier transform infrared spectroscopy (FTIR), and size of microcapsules were determined with scanning electron microscopy (SEM). Paper coating formulations containing starch binder and encapsulated ammonium polyphosphate in different ratios (0,1,3,5,7.5) were prepared and coated onto office paper. Color (with spectrophotometer), gloss (with glossmeter), contact angle (with goniometer) and flame retardancy (with LOI) properties of coated papers were measured. Offset test prints were made on the coated papers produced with IGT C1 and the changes in color and gloss of the coating were determined. As a result, ammonium polyphosphate was successfully encapsulated by in situ polymerization. It was concluded that as the amount of microencapsulated ammonium polyphosphate increased, the flame retardancy property increased and there was no decrease in printability.