BACTERICIDE (MODIFICATIONS) AND A METHOD FOR PREPARING MIXTURE OF DI- AND TRIVALENT SILVER OXIDES FOR BACTERICIDES Russian patent published in 2003 - IPC

FIELD: inorganic biocides. SUBSTANCE: invention relates to silver-based inorganic bactericides and to electrolytic method for preparing mixture of di- and trivalent silver oxides, which are active substances for bactericides and can be used for bactericidal treatment of water in medicine and as components of drugs containing inorganic active ingredients, in particular silver and compounds thereof. First bactericide modification contains, 0,24×10^-5-2,4 wt % of mixture of di- and trivalent silver oxides (active principle) in solid state, 1,2×10^-5-12.0 wt % of 85% aqueous phosphoric acid, and water, the rest. Second bactericide modification contains additionally from 0.08 to 84.0 wt % of borax. Third bactericide modification is composed as the first one, in which water is replaced by polyethylene oxide and forms gel. The essence of proposed preparation method consists in electrolysis with silver electrodes conducted without reverse of polarity of silver electrodes. After achievement of potential 1,23 V on silver anode, 0.5-5.0 wt % of phosphoric acid modifier is added to form, in interelectrode space, mixture of di- and trivalent silver oxides, after which this solid mixture is separated from electrolytic solution, separated fractions being self- contained disinfecting agents. EFFECT: enabled preparation of stable bactericide forms due to increased reactivity of silver ions caused by increased degree of oxidation thereof and associated additional stabilization by phosphoric acid anions. 9 cl, 8 ex