Liquid purification or separation – Processes – Utilizing electrical or wave energy directly applied to...
Patent
1997-04-03
1999-10-05
Wyse, Thomas G.
Liquid purification or separation
Processes
Utilizing electrical or wave energy directly applied to...
210764, 210192, 210501, 422 6, 422 24, 424421, 424490, 424618, 424630, 424641, A01N 5916, A01N 5920, C02F 150
Patent
active
059618434
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD TO WHICH THE INVENTION BELONGS
The present invention relates to an antimicrobial solid material which is suitably used for sterilization (killing bacteria and fungi) of a liquid such as sewage, and the like, or antimicrobial use at a surface of parts contacting with sewage, process for producing the same, and the like.
PRIOR ART
Liquids such as sewage, and the like, having high needs of antimicrobial action and forms of contacting portions with such liquids can be classified to the following three types. such as a bubble bath, an artificial fall, a pool, a cooling tower, and the like, and contacting portions thereof. bag, a chest drain bag, and the like, water kept for a long time such as a water tank, a bath water, and the like, and contacting portions thereof. a washing space such as a kitchen, a sink, a bathroom, and the like, and contacting portions thereof.
In recent years, in the field of antimicrobial techniques, inorganic antimicrobial agents mainly comprising silver ions as antimicrobial materials have been attracted to attention since it is excellent in safety, heat resistance and persistency as compared with organic antimicrobial agents. And, as a specific form of the antimicrobial agent, a structure in which a silver ion is carried on a porous ceramic is generally employed since it can effectively show its antimicrobial characteristics of silver ions as well as it has a form which can be easily used. As the porous ceramic which is a carrier, zeolite (Japanese Laid-Open Patent Publication No. 255010/1991), layered silicate (Japanese Laid-Open Patent Publication No. 19308/1990), calcium phosphate (Japanese Laid-Open Patent Publication No. 243908/1992), zirconium phosphate (Japanese Laid-Open Patent Publication No. 83905/1991), aluminum phosphate (Japanese Laid-Open Patent Publication No. 229911/1993), soluble glass (Japanese Laid-Open Patent Publication No. 7201/1991), titanium oxide (Japanese Laid-Open Patent Publication No. 65012/1994, Japanese Laid-Open Patent Publication No. 816/1993, Japanese Laid-Open Patent Publication No. 9853/1994), and the like, have been utilized.
In order to show the antimicrobial activity of silver sufficiently, it has been described that it is desired to keep silver in an ion state enriched in reactivity (J. Antibact. Antifung. Agents, Vol. 22, No. 3 (1994)). In the above proposal, it is devised to hold silver to a carrier preferably as a silver ion or to gradually release silver from a carrier as a silver ion. However, it has been known that a metal state silver has a certain degree of a bactericidal effect ("inorganic chemistry (the first volume)", Sangyo Tosho, Tokyo, Japan (1959)).
PROBLEMS TO BE SOLVED BY THE INVENTION
However, in either of the method of supporting silver ions to a carrier, the method of gradually releasing in a liquid to be treated as silver ions as described above, or the method of adopting powder of metal silver directly to a liquid to be treated which has been conventionally carried out, it was not sufficient to keep antimicrobial action in either of the above mentioned three forms (circulating water, collected water, flowing water) for a long period.
As a method for gradually releasing silver ions in a system, there is a method as described in Japanese Laid-Open Patent Publication No. 19308/1990. In Japanese Laid-Open Patent Publication No. 19308/1990, there is disclosed an antimicrobial silicate having a film forming property in which at least part of metals which are exchangeable ion contained in a layered silicate is replaced with at least one kind of metal selected from silver, copper and zinc, specifically silver montmorillonite. The silver montmorillonite releases silver ions so that it shows certainly excellent antimicrobial activity at an initial stage. However, when the object is flowing water, collected water, and the like, or when a liquid which contains a large amount of alkali metal ions such as Na, K, and the like, like urine is an object, it loses its effect relatively within a short period.
Here, the
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Hayakawa Makoto
Kanno Mitsuyoshi
Kimura Tamon
Norimoto Keiichiro
Watanabe Toshiya
Toto Ltd.
Wyse Thomas G.
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