JPH11228314A - Agent to prevent attachment of marine organism and prevention of attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an agent to efficiently prevent attachment of marine organisms, particularly serpulid Polychaetes, which cause various troubles by growing on the surface of various tools and materials in sea water, by including a triphenylborane-alkali metal hydroxide adduct as an active ingredient. SOLUTION: This composition is obtained by including a triphenylborane- alkali metal hydroxide adduct (e.g. triphenylborane-sodium hydroxide and triphenylborane-potassium hydroxide) as an active ingredient. It is usually preferable that the amount of application is 0.001-0.5 mg/l in the objective sea for 12-24 h/d or so. The objective marine organisms to prevent their attachment include serpulid Polychaetes (e.g. Hydroides elegans Haswell), mussel, bryozoan, and barnacle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agent for preventing marine organisms from adhering and a method for preventing the adhesion. For more information,
The present invention relates to an agent for efficiently preventing marine organisms, particularly scorpions, which adhere to and grow on various equipments and walls in a seawater system and cause various obstacles, and a method for preventing such agents.

[0002]

2. Description of the Related Art In plants such as thermal power plants, nuclear power plants, and steelworks that utilize seawater, marine organisms (Kasane kanashi, mussels, green mussels,
Mosquitoes, barnacles, pitworms, sea squirts, etc.) and reduce their cooling function. That is, the attached marine organisms not only reduce the heat exchange efficiency of the attached portion, but are also stripped off by water pressure or water flow, causing clogging of cooling tubes and strainers of the heat exchanger, thereby causing seawater flow. Block water. In addition, lycaenids adhere to the cooling tubes of the heat exchanger and cause pitting corrosion.

Conventionally, chlorine gas, sodium hypochlorite, and the like have been used to prevent the adhesion of marine organisms as described above. However, use of chlorine gas or chlorine-based chemicals is environmentally unfavorable because it may generate harmful substances such as trihalomethane and dioxin. In addition, chlorine gas or chlorine-based chemicals sometimes fail to provide a sufficient effect of preventing the adhesion of marine organisms, and in particular, have insufficient effects on scorpions such as kansane kansasi.

[0004] Here, the lycaenids are marine organisms belonging to the phylum Annelida, polychaete, and lycaenidae, and the larva swims in the sea and attaches when it comes into contact with the attachment base, and secretes calcareous living tracts. And grow. It is not uncommon for the thickness of the formed adhesion layer to reach 10 cm or more in about two months.

On the other hand, triphenylborane / alkali metal hydroxide adduct, which is an active ingredient of the present invention, is known as a leafy plant killer (see US Pat. No. 3,062,708). However, there is no known control effect on marine organisms such as lycaenids and green mussels. Further, a complex compound of triphenylborane with a primary amine is known as an antifouling component of an underwater antifouling paint (U.S. Pat. No. 3,211,679, JP-A-8-29556).
08 and JP-A-8-295609).

[0006]

SUMMARY OF THE INVENTION In view of the above situation and recognition, the present invention has low toxicity to humans, livestock and seafood, especially to facilities and waterways in sea areas where serrata are preferentially attached. It is an object of the present invention to provide a new drug and a method which are less affected by water and have a remarkable effect on the prevention of adhesion of scuttlefish.

[0007]

Means for Solving the Problems The inventors of the present invention provide:
As a result of intensive studies on a compound having a small effect on the environment and having an effect of preventing the adhesion of slime sticks, triphenylborane / alkali metal hydroxide adduct was found to be 1/4 to 1/10 of a known adhesion inhibitor. It has been found that even with such a low addition amount, there is a remarkable adhesion preventing effect, and the present invention has been completed.

Thus, according to the present invention, there is provided an agent for preventing marine organisms from adhering, which comprises, as an active ingredient, an adduct of triphenylborane and an alkali metal hydroxide.

According to the present invention, the addition of triphenylborane / alkali metal hydroxide to the target seawater system prevents or suppresses the attachment of marine organisms. A method is provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The alkali metal of the triphenylborane / alkali metal hydroxide adduct, which is an active ingredient of the present invention, includes lithium, sodium, potassium, rubidium, cesium and francium. While triphenylborane is unstable in the air, this triphenylborane / alkali metal hydroxide adduct is stable and easy to handle. In view of such workability, a triphenylborane / sodium hydroxide adduct or a triphenylborane / potassium hydroxide adduct can be suitably used. Further, two or more of these triphenylborane / alkali metal hydroxide adducts can be used in combination.

As the triphenylborane / alkali metal hydroxide adduct, those commercially available as an aqueous solution can be used. In order to add the aqueous solution so as to be uniformly dispersed in the target seawater system, it is only necessary to dilute the aqueous solution by adding water, which is preferable because an organic solvent such as ethyl alcohol or ethylene glycol is not required. . Further, the aqueous solution does not require any additives such as a surfactant, and is very preferable in terms of environment.

[0012] The amount of the marine organism adhesion inhibitor of the present invention can be appropriately determined depending on the level of physiological activity of the marine organism. Usually, 0.001-0.5 for seawater flow
It is appropriate to add mg / l, preferably 0.003 to 0.1 mg / l, of the antiadhesive agent to the target seawater system for about 12 to 24 hours per day. The amount of addition is 0.1 to the seawater flow rate.
If it is less than 001 mg / l, or if the addition time is less than 12 hours per day, the effect of preventing the adhesion of marine organisms becomes insufficient, which is not preferable. In addition, the amount of addition is 0.5 m
Even if it is added in excess of g / l, no further anti-adhesion effect can be expected, and it is not preferable for economic reasons. Furthermore, the amount of the marine organism adhesion inhibitor of the present invention can be reduced within the above range by continuous addition.

The marine organism adhesion inhibitor of the present invention is a known marine organism adhesion inhibitor, hypochlorous acid, as long as it does not inhibit the effect of preventing the adhesion of the triphenylborane / alkali metal hydroxide adduct. It can be used in combination with an anti-fouling (antifouling) component such as sodium, hydrogen peroxide, quaternary ammonium salt, and higher aliphatic amines. In such a case, it is possible to adjust an anti-adhesion agent having a broad biological spectrum while utilizing the individual characteristics of the drug used in combination.
This is a preferred embodiment.

The marine organisms to be prevented from fouling according to the present invention include various equipment and materials in the seawater system and marine organisms that grow and adhere to the wall surface and cause various obstacles, for example, Kasane Kansashi, Kansashigokai, Spiroblanks, Yakko Kansashi, Yupomatsus, Nagare Kansashi, Salmakina, Uzumakigokai, Kurukigera and Merchierella, etc., mussels, mussels, green mussels, bryozoans, barnacles, hydromussii, sea squirts and the like. Act on.

[0015]

The present invention will be described in detail with reference to the following test examples, which do not limit the scope of the present invention.

Test Example 1 [Efficacy Confirmation Test in Seawater Cooling Water System] At a time when the kansane kansashi adheres remarkably, seawater is pumped up from a seawater headrace of a steel mill where a lot of troubles caused by kansane kansashi occur by a water pump, and is temporarily passed through a model waterway. The test was conducted by passing water through the formula (flow rate: 2 tons / hour). A vinyl chloride pipe (inner diameter 65 mm x length 450 mm) in the model waterway
Is cut in half and the inner surface is made with a 5 mm eyelet Cremona (Kuraray Co., Ltd.
A test piece having a net made of polyvinyl alcohol-based synthetic fiber) was attached to a column (70 mm in inner diameter x 500 mm in length) for attaching organisms inserted along the wall surface. At the time of passing water, each reagent agent was injected with a predetermined injection (addition) amount and a predetermined injection (addition) time by a chemical pump, and after 40 days, the number of attached organisms such as Kanashi Kanashi attached to the test piece was counted. Each reagent used was diluted with water. Table 1 shows the obtained results together with the injection amount and the injection time.
Shown in

[0017]

[Table 1]

From Table 1, it can be seen that the injection amount of 0.005 mg / l
It can be seen that the continuous addition for 4 hours has a remarkable effect on the prevention of the adhesion of Kanashi Kanashi (Examples 1 to 5). on the other hand,
With the addition of a known seawater-based anti-adhesion agent such as sodium hypochlorite, no effect on the kanashi kanashi was observed even if the addition was continued for 24 hours at a concentration of 4 times or more of the above injection amount (Comparative Examples 1 to 3). .

[0019]

EFFECT OF THE INVENTION The anti-adhesion agent for marine organisms of the present invention has low toxicity to humans and livestock and fish and shellfish, has little effect on the environment,
It is characterized by containing a highly safe triphenylborane / alkali metal hydroxide adduct. Therefore, it is possible to efficiently and economically prevent the attachment of marine organisms for a long time in the seawater cooling water system. In particular, the anti-adhesion agent of the present invention can extremely effectively prevent and suppress the adhesion of kansui scorpions such as kansane kansashi, which has been difficult to control.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takashi Mizumori 2-10-15 Higashiawaji, Higashiyodogawa-ku, Osaka City Inside Katayama Chemical Industry Research Laboratories (72) Inventor Akira Katsumoto 2 Higashiawaji, Higashiyodogawa-ku, Osaka-shi No. 10-15, Katayama Chemical Industry Laboratory Co., Ltd.

Claims (6)

[Claims] 1. An anti-adhesion agent for marine organisms, comprising a triphenylborane / alkali metal hydroxide adduct as an active ingredient. 2. The adhesion inhibitor according to claim 1, wherein the triphenylborane / alkali metal hydroxide adduct is a triphenylborane / sodium hydroxide adduct and / or a triphenylborane / potassium hydroxide adduct. 3. The anti-adhesion agent according to claim 1, wherein the marine organism is a lycopodium. 4. The method according to claim 1, wherein the target seawater system contains triphenylborane.
A method for preventing the adhesion of marine organisms, comprising adding or adding an alkali metal hydroxide adduct to prevent or suppress the adhesion of marine organisms. 5. The method according to claim 3, wherein the triphenylborane / alkali metal hydroxide adduct is a triphenylborane / sodium hydroxide adduct and / or a triphenylborane / potassium hydroxide adduct. 6. The method for preventing adhesion according to claim 4, wherein the marine creature is a scuttlefish.