Effect of Silica Gel Carriers on Thermal Stability of the Anti -microbial Material with Thiosulfato Silver Complex

Abstract

Anti-microbial materials were prepared with thiosulfato -silver complex supported on silic a gel. Thwe emkrea terials neaded with resin, and the color difference value ΔE_ab^* of the surface against natural re sin was measured. The ΔE_ab^* values were improved with an increase of specific surface area, or a doefc preoarvseoe l oufm sieli gceacl a rriers. Heat-treatment for silica gel carriers was usef ul foro ifm thprovement e suppression of ΔE_ab^* values. It was suggested that the color changes of molded resins with anti-microbial materials were caused by oxidatio n of decomposition of the complexes with adsorbed water that was free from silica gel carriers by heat -treatment through molding process -treatment for silica gel carriers decreased the. Heat adsorbed water on the carriers. Then this decrease resulted in reduction of free water from the carriers, and also resulted in inhibition for color changing of th e resin.