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The aim of this research is to develop a textile product to prevent and eliminate biological contaminations in drinking water and other liquid-leading systems. Herein, the adjustment of the silver release from silvered textile materials with the retention of the antibactericidal qualities has been studied. The limited values for silver in drinking water in Germany (100 µg/l) must be considered as well. Moreover, the factors of the adjustment of the silver release, such as the concentration of the silver on the one hand and the reduction agent, the silvering process, the thermal fixation time and temperature, the size of the silver particles, and the thickness of the silver layer on the surface of textile materials for the silvering on the other hand have been systematically examined by using polyethylene terephthalate (PET) materials as a basis. Silver concentration in the elution has been detected by means of atom absorption spectroscopy (ZEEnit 700, Analytics Jena, Germany). The amount of silver taken up by PET was weighed after was under a constant heat of 900°C for 4 h.

The wet-chemical functionalization and modification of the inert textile fiber surface of polyethylene terephthalate (PET) was metalized by using natural and synthetic polyamine with new coating procedures. The developed wet-chemical procedures in this research are based on the use of short- and long-chain amines, which consist of at least two amine groups, and which are well-suited to form a silver diamine complex. The silvered PET was coated by cationic silver. After the chemical reduction, the cationic silver turns into metallic particles on the surface of PET. The surface morphology, that is, homogeneity of the layer, cracking, casing, and the fiber surface with metallic silver particles was determined by a scanning electron microscope (SEM). The particle size, as well as the layer thickness, was calculated by the SIS program. The adhesion characterization of the applied silver layers on the PET was tested by a washing fastness check.