JP3111250B2 - Anti-algal agent, method for producing the same, and method for preventing alga - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a novel algicidal agent and a method for producing the same, and further relates to a novel algal protective method.

[0002]

2. Description of the Related Art In recent years, interest in ornamental fish has been increasing, and demand for such fish has been increasing. In this connection, many types of breeding devices are commercially available. In particular, various devices have been adopted for sterilizing and filtering devices for water.

[0003] There have also been many attempts at lighting devices, lighting lamps, and the like for making the colors of bred fish appear vivid.

[0004] On the other hand, a great deal of knowledge or information has been gathered on seaweeds and the like bred together with ornamental fish, regarding their combinations and types.

[0005]

However, there is a problem that these prior arts have not been sufficiently improved. That is, with the growth of algae such as cyanobacteria and green algae, the breeding water becomes turbid, or the algae adhere to and propagate on the glass surface of the aquarium, thereby impairing the visual field inside the aquarium or the appearance of the aquarium. There is. In addition, if algae adhere to the gravel on the bottom of the water tank, the gravel is colored, and if the algae are collected by the filtration unit, the filtration performance of the filter deteriorates. Along with this, it is necessary to frequently maintain the aquarium, and especially in a large aquarium or the like, the maintenance burden (cost and labor) thereof becomes considerably large. These problems are further exacerbated by increasing the amount of illumination for producing the inside of the aquarium, as the algae is promoted.

[0006] In this connection, it is conceivable to introduce an algicide, but if it is used, its toxicity may adversely affect not only ornamental fish but also breeding seaweeds, which complicates the problem.

[0007] On the other hand, antialgal agents using inorganic salts are commercially available, but there are concerns about fish toxicity and variability, and those raised in indoor aquariums are secondary to humans. Impact is feared.

As described above, none of the conventional techniques can prevent or suppress the growth of algae, and in fact, there is a strong demand for the development of means capable of solving these problems.

Accordingly, it is a main object of the present invention to provide a novel algicidal agent which can prevent or suppress the growth of algae and is excellent in safety.

[0010]

The present inventor has conducted intensive studies in view of the problems of the prior art, and as a result, when a specific component conventionally used as an antibacterial agent is used as an antialgal agent, The inventors have found that the above object can be achieved, and have completed the present invention.

That is, the present invention relates to the following algicidal agents and antialgal methods.

1. An anti-algal agent containing a silver thiosulfato complex.

2. A tablet-type anti-algal agent comprising a silver thiosulfato complex, an excipient and a sustained-release-imparting agent.

3. 3. The tablet-type algicidal agent according to the above item 2, comprising a carrier in which a silver thiosulfato complex is carried on silica gel, an excipient, and a sustained release-imparting agent.

4. 4. The anti-algal agent according to any one of the above items 1 to 3, further containing germanium oxide.

5. A method for producing an alga-proofing agent, comprising molding a mixture comprising a silver thiosulfato complex, silica gel and an organic binder.

6. 6. The method for producing an algicidal agent according to the above item 5, wherein a silver thiosulfato complex supported on silica gel is used as the silver thiosulfato complex.

[7] 5. An anti-algal method comprising adding the anti-algal agent according to any one of the above-mentioned items 1 to 4 in water such that the silver thiosulfato complex concentration becomes 0.05 to 2 mg / liter in terms of silver weight.

8. 8. The method according to item 7, wherein an anti-algal agent containing germanium oxide is further added.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The antialgal agent of the present invention is characterized by containing a silver thiosulfato complex. Silver thiosulfate complex itself, for example, silver silver thiosulfate complex _{([Ag X (S 2 O} 3)] -) turned into, can be used as it is this complex as silver thiosulfate complex. Examples of the complex include a sodium salt and a potassium salt. Further, a carrier in which a silver thiosulfato complex is carried on silica gel can also be used. Specifically, those obtained by supporting a thiosulfatosilver complex on a silica gel particle carrier and further hydrolyzing a reactive organic silicon compound by a sol-gel method to coat at least a part of the surface with silica or the like are also available. It can be suitably used. As such a carrier, for example, a silver-based antibacterial material “Amenitop (registered trademark)” (Matsushita Electric Industrial Co., Ltd.)
) Can also be used.

The anti-algal agent of the present invention may optionally contain at least an excipient and an additive for a sustained-release-imparting agent. In addition, components other than these can be blended as long as the effects of the present invention are not impaired.

As an excipient, for example, silica gel can be used. As the silica gel, a known silica gel can be used, and for example, a commercially available silica gel can be used as it is. Further, for example, those obtained by any method such as those prepared from an aqueous solution of sodium silicate and those obtained by a sol-gel method from an organic silicon compound can be used. Silica gel can be used as it is by mixing with other components.

The sustained release-imparting agent is not particularly limited as long as rapid release of the silver thiosulfato complex from the algicidal agent of the present invention can be suppressed, but it is preferable to use an organic binder. The organic binder only needs to be one that does not elute harmful substances in water. For example, resins such as polyethylene and ethylene-vinyl acetate copolymer can be used, and commercially available products can also be used as they are. The form of the resin is not particularly limited, and any form such as a particle form can be applied.

The antialgal agent of the present invention may further contain germanium oxide. This makes it possible to more effectively suppress or prevent the propagation of diatoms and the like. Known germanium oxide can be used, and a commercially available product can also be used as it is. The compounding amount may be appropriately set according to the amount of the silver thiosulfato complex used and the like.

In the present invention, the above additives can be blended with the silver thiosulfato complex for use. These mixing ratios are determined based on the applied formula such as the capacity of the water tank, the water quality (fresh water, seawater, etc.), the frequency of replenishing water, and the components used (silver thiosulfato complex,
It may be appropriately set according to the type of the sustained release imparting agent, excipient, etc.). For example, when using an organic binder as a thiosulfato silver complex, silica gel and a sustained release imparting agent,
Usually, about 10 to 80% by weight of silver thiosulfato complex, about 80 to 10% by weight of silica gel, and 5 to 10% of organic binder.
What is necessary is just about weight%.

When these additives are used, the respective components can be simultaneously or sequentially compounded and uniformly mixed, and the resulting mixture can be molded into an appropriate shape according to a known molding method. Specifically, for example, tableting or granulation can be performed using the above mixture. Granulation may be performed according to a known granulation method. In the case of making a tablet, it may be manufactured by a known tableting method. Conditions such as tableting pressure can also be appropriately set according to the material composition and the like according to a known method. In addition, the obtained tablet can be heated and melt | dissolved an organic binder as needed. Thereby, the sustained release performance can be reduced. The anti-algal agent of the present invention can be used for both freshwater and seawater applications, and the type of fish to be bred is not limited.

The form of the anti-algal agent of the present invention is not particularly limited.
For example, it can be used in various shapes such as tablets, granules, and plates.

The method of using the anti-algal agent of the present invention may be put into a water tank or the like. In particular, the concentration of silver thiosulfato complex is usually about 0.05 to 2 mg / liter, preferably 0.05 to 1 mg in terms of silver weight. Per liter is desirable. In the method of the present invention, an anti-algal agent containing germanium oxide may be separately prepared and added together with the anti-algal agent of the present invention. In the anti-algal agent containing germanium oxide, the same additives and compositions as the anti-algal agent of the present invention can be employed. The addition amount of the anti-algal agent containing germanium oxide may be appropriately changed according to the addition amount of the anti-algae agent of the present invention, etc., and is usually about 0.04 to 4 mg / liter, preferably 0. The dose may be 1-2 mg / liter.

[0029]

[Function] When rearing ornamental fish in an aquarium,
The phenomenon that algae adhering to the sand, the filter medium, etc. spread on the bottom of the aquarium and mixed therein, often propagate in the aquarium. This is fish feed,
The excrement of fish and the like is decomposed by microorganisms, which becomes a nutrient source of algae, and also uses the energy of lighting for ornamental fish.

When the algae adhere to the wall surface of the aquarium glass, the sand surface on the bottom surface, etc., the proliferative power becomes larger than that in the case of floating. In addition, when it floats, it is trapped by the sand on the bottom surface, the filtration part, and the like, causing problems such as coloring the sand part and deteriorating filtration performance.

In this case, by adding the silver-based antibacterial material into the aquarium, the growth of microorganisms can be suppressed, the nutrient sources of algae can be reduced, and the growth of algae itself can be suppressed by inhibiting the enzyme reaction of silver.

However, especially when the ornamental fish rearing solution in the aquarium is seawater, a large amount of sodium chloride is contained. In this case, the active ingredient in the antibacterial agent is silver, but silver ions are cations (Ag ⁺ ), and react with chloride ions (Cl ⁻ ) in water to form silver chloride (AgCl). The solubility of silver ion, which is an active ingredient, is reduced, and the above-mentioned effects are significantly reduced.

On the other hand, by using the silver thiosulfato complex ([Ag _X (S ₂ O ₃ )] ⁻ ) as an anion, the reaction with chloride ion (Cl ⁻ ) does not occur. An effect equal to or higher than (Ag ⁺ ) can be exerted. Thus, the anti-algal agent of the present invention can exert excellent effects not only for freshwater but also for seawater.

[0034]

Since the antialgal agent of the present invention uses a silver thiosulfato complex as an anion as an active ingredient, it is possible to achieve an effect superior to that of the prior art.

That is, the anti-algal agent of the present invention can exert an excellent anti-algal effect not only in fresh water but also in seawater.

The silver thiosulfato complex is preferably a cyanobacterium,
Although effective against green algae, etc., when used in combination with germanium oxide, the synergistic effect of both the silver thiosulfato complex and germanium oxide exerts excellent effects not only on cyanobacteria, green algae, but also on diatoms. Thus, it is possible to obtain a good alga prevention effect against a wider variety of algae.

Further, the anti-algal agent of the present invention has extremely low fish toxicity and the like, and is substantially harmless to the human body because there are no components that evaporate in the breeding environment, and is excellent in safety. Furthermore, by using a sustained-release-imparting agent or the like, the active ingredient can be stably eluted over a long period of time, and thereby the burden on the maintenance of the aquarium can be reduced. For this reason, it is particularly effective in aquariums where the burden of tank maintenance is large.

The anti-algal agent of the present invention having such characteristics can be effectively applied to any breeding water, breeding fish, breeding place, algae to be protected, and the like.

[0039]

The following examples are provided to further clarify the features of the present invention.

Example 1 An antialgal agent for tablets was produced using a silver-based antibacterial material (silver thiosulfato complex).

A mixture comprising 20% by weight of a silver-based antibacterial material (“Amenitop (registered trademark)” manufactured by Matsushita Electric Industrial Co., Ltd.), 10% by weight of polyethylene fine particles and 70% by weight of silica gel was tableted, and the diameter was 8 mm × Tablets having a thickness of 5.0 mm were produced (0.25 g / 1 tablet). The thiosulfato silver complex (in terms of silver weight) in one tablet was 1.75 m.
g. FIG. 1 shows a schematic diagram of the internal structure of the obtained tablet.

Next, the algae-controlling effect was examined by changing the amount of the alga-proofing agent to be added to the amount of water in the aquarium for breeding marine fish at the ratio shown in Table 1. Table 1 shows the results.

[0043]

[Table 1]

From these results, it can be seen that if one tablet of the anti-algal agent of the present invention is added to a water volume of 20 liters of a water tank and replenished once every two months, it is possible to prevent algae from adhering to the wall surface of the water tank. .

Here, a water tank device into which the anti-algal agent of the present invention has been introduced, and the mechanism of algae growth and algal protection in the water tank will be described. First, 2 to 5 cm of sand is laid on the bottom of a water tank made of glass or acrylic resin, and the water tank is filled with seawater for 7 minutes. Next, a seawater purification circuit passing through a filtering device was provided, and fluorescent light illumination was applied from above to form an aquarium fish tank. Subsequently, a saltwater fish is put in this aquarium, and an automatic feeding device for feeding food for breeding is installed to feed the food periodically.

With the passage of the breeding days, remaining food and the like are degraded by microorganisms in seawater. Since the growth rate of microorganisms is higher when they adhere to the tank wall surface than when they float, they adhere to the tank wall surface, sand surface, etc., and produce slimy substances. Algae proliferate using the degradation products of these microorganisms as nutrient sources. In other words, the algae multiply by the food chain.

In this case, when the anti-algal agent of the present invention is added, the above-mentioned food chain is broken and the nutrient source of the algae is lost, so that the growth of the algae can be suppressed or prevented.

Example 2 An anti-algal agent containing germanium oxide was used in combination with the tablet of Example 1.

Tablets were produced in the same manner as in Example 1 except that germanium oxide was used as the antialgal agent instead of the silver-based antibacterial material of Example 1. However, the composition in the tablet was 10% by weight of germanium oxide, 10% by weight of fine polyethylene particles and 80% by weight of silica gel.

This tablet was used as a second algicidal agent, and the antialgal effect was examined in the same manner as in Example 1. As a result, it was possible to suppress the growth of algae by adding one tablet to a water tank at a rate of once every two months at a rate of one tablet in a water tank capacity of 20 liters in combination with the anti-algal agent of the present invention.

[Brief description of the drawings]

FIG. 1 shows a schematic diagram of the internal structure of a tablet used in Example 1.

[Explanation of symbols]

 1: Algaeproofing agent 2: Silver antibacterial material 3: Silica gel 4: Polyethylene powder

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiichi Kato 2-6-10 Koraibashi, Chuo-ku, Osaka-shi, Osaka Dynic Corporation Osaka branch office (72) Inventor Toshioka Tomioka 1006 Kazuma Kazuma, Kadoma-shi, Osaka Matsushita Electric (72) Inventor Hiroshi Ejiri 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. (56) References JP-A-9-322267 (JP, A) JP-A-5-124905 ( JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01N 59/16 A01N 25/08 A01N 41/08 A01N 55/02

Claims (8)

(57) [Claims] 1. A tablet-type algicidal agent containing a silver thiosulfato complex. 2. A tablet-type algicidal agent comprising a silver thiosulfato complex, an excipient and a sustained release-imparting agent. 3. The tablet-type algicidal composition according to claim 2, which comprises a carrier in which a silver thiosulfato complex is carried on silica gel, an excipient and a sustained-release-imparting agent. 4. The tablet-type algicidal composition according to claim 1, further comprising germanium oxide. 5. A tablet formed by molding a mixture comprising a silver thiosulfato complex, silica gel and an organic binder.
A method for producing a dosage form anti-algal agent. 6. The method for producing a tablet-type alga-proofing agent according to claim 5, wherein a carrier in which a silver thiosulfato complex is carried on silica gel is used as the silver thiosulfato complex. 7. The tablet-type antialgal agent according to any one of claims 1 to 4 is added to water so that the silver thiosulfato complex concentration becomes 0.05 to 2 mg / liter in terms of silver weight. A method for preventing algae, which comprises: 8. The method according to claim 7, further comprising adding an anti-algae agent containing germanium oxide.