Method for producing silver-ion antibacterial liquid, silver-ion antibacterial liquid produced by said method, method for producing silver-ion antibacterial powder, and silver-ion antibacterial powder produced by said method
A method for producing silver-ion antibacterial liquid using a type A or type X silver zeolite includes a process to weigh silver zeolite for obtain its blending quantity in a range of 0.1 to 20.0 percent by weight and to weigh citric acid for obtaining its blending quantity such that its blending ratio to the silver zeolite becomes 1.2 or greater, followed by blending of the two into purified water; a process to mix under agitation the silver zeolite and citric acid blended in the purified water to prepare a mixture liquid containing at least a citric acid-silver complex and silica hydrate; and a process to remove the silica hydrate produced in the mixture liquid. The production method can produce at low cost a silver-ion antibacterial liquid offering immediate bactericidal effect.
1. A method for producing silver-ion antibacterial liquid containing silver ions fully eluted from silver zeolite, by collapsing a three-dimensional framework of the silver zeolite using citric acid, said silver-ion antibacterial liquid being obtained by mixing solely a material consisting of the silver zeolite, citric acid, and purified water, said method comprising:
a process to weigh the silver zeolite wherein the silver zeolite is a type A silver zeolite for obtaining a blending quantity of the silver zeolite such as to be in a range of 0.1 to 20.0 percent by weight relative to the weight of the material, and to weigh citric acid for obtaining a blending quantity of the citric acid in a range of 0.12 to 28.0 percent by weight relative to the weight of the material such that a blending weight ratio of the citric acid to the silver zeolite becomes 1.2 or greater but 1.4 or less, followed by blending the silver zeolite and the citric acid into the purified water;
a process to mix under agitation the silver zeolite and citric acid blended in the purified water, thereby collapsing the three-dimensional framework of the silver zeolite, to prepare a mixture liquid containing a citric acid-silver complex
wherein y is 1 or 2, and silica hydrate; and
a process to remove the silica hydrate produced in the mixture liquid.
2. A method for producing silver-ion antibacterial liquid according to claim 1 , wherein the silver zeolite contains silver supported thereon in an amount of 0.5 to 5.0 percent by weight relative to the silver zeolite.