JPH10279404A - Antifouling agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antifouling agent which has an excellent repelling effect on fouling organisms in water without killing them by formulating 7-hydroxy-N, N-di-n-propyl-2-aminotetralin as an active ingredient. SOLUTION: This antifouling agent contains 7-hydroxy-N,N-di-n-propyl-2- aminotetralin of the formula or its salt (hydrobromic acid salt and the like) as an active ingredient. This antifouling agent is prepared in forms of coating material, solution and emulsion to use. For example, when used as the coating material, an antifouling coating material is prepared by formulating the above active ingredient with a coating regulator and it is applied to ship-bottom, construction in water and waterway for cooling water. Further, the above active ingredient is preferably formulated in a proportion of 1 ppm-1 wt.% based on the each weights of coating material, solution and emulsion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifouling agent for preventing the adhesion of harmful organisms in water, and more particularly, to the bottom of a ship, a cooling water intake channel of a thermal power plant, an aquaculture fishing net or a fishing net. The present invention relates to an antifouling agent for harmful aquatic organisms that prevents harmful aquatic organisms from attaching to and breeding buoys and stationary fishing nets.

[0002]

2. Description of the Related Art Barges, mussels, oysters, mosses and mosses are located on the bottoms of ships, underwater structures such as cooling water intake channels such as thermal power plants, and parts in contact with seawater such as aquaculture nets or buoys and stationary fishing nets. Harmful aquatic organisms such as species, hydra, sea squirts, blue seaweeds, blue seaweeds, etc. attach and breed, causing significant industrial damage, such as an increase in fluid resistance, heat exchange, deterioration of heat transfer performance, and deterioration of fishing net tides. Effect.

Heretofore, antifouling agents using organic tin compounds, cuprous oxide, nitrogen-sulfur compounds, and the like have been used to prevent the adhesion and propagation of such harmful inhabitants living in seawater and freshwater.

[0004]

In recent years, environmental pollution of the sea and rivers by heavy metals and harmful substances and harm to human bodies through fish and shellfish have become social problems. Many antifouling agents are subject to regulation from this point of view. An object of the present invention is to provide a safe and effective antifouling agent that replaces these conventional antifouling agents.

[0005]

Means for Solving the Problems The present inventors have intensively studied to develop an antifouling agent having high safety and excellent effect. As a result, 7-hydroxy-N, N-di-n- Propyl-2-aminotetralin (7-Hydroxy-N, N-di-n-propyl-2-aminotet
ralin) has been found to have anti-adhesion properties to organisms that adhere to water, and have completed the present invention.

That is, the present invention provides the following formula (I):

[0007]

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[0008] An antifouling agent comprising 7-hydroxy-N, N-di-n-propyl-2-aminotetralin or a pharmaceutically acceptable salt thereof as an active ingredient represented by the following formula: .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The substance as an active ingredient of the antifouling agent of the present invention is represented by the following formula (I):

[0010]

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7-hydroxy-N, N-di-n-propyl-2-aminotetralin or a pharmaceutically acceptable salt thereof. 7-Hydroxy-N, N-di-n-propyl-2-aminotetralin is a known substance and is commercially available as a reagent. Pharmaceutically acceptable salts of this substance include, for example, hydrobromide (hereinafter 7-hydroxy-N, N-di-n-propyl-2-aminotetralin and its pharmaceutically acceptable salts). And the salts that are acceptable in the present invention.

The antifouling substance may be used alone,
It can be used by mixing with other antifouling substances. The antifouling substance can be used in the form of a paint, a solution, an emulsion or the like. These adjustments can be carried out without any problems by employing general prescriptions which are usually made. For example, when used as a paint, the present antifouling substance is mixed with a paint preparation to prepare an antifouling paint, which can be applied to ship bottoms, underwater structures, cooling water channels, and the like. Examples of the film forming agent used at this time include oil varnish, synthetic resin, artificial rubber and the like. The antifouling paint may further contain a solvent, a pigment, and the like, if desired. In this case, the antifouling substance is 1 ppm to 1%, preferably 50 ppm based on the weight of the paint.
It is blended at a rate of ~ 0.5%.

When the antifouling substance is used as a solution,
For example, the present antifouling substance is mixed with a film-forming agent to form a solution dissolved in a solvent, and this solution can be applied to a cultured fish net, a fixed fish net, or the like for the purpose of preventing the adhesion and propagation of aquatic organisms. As the film forming agent, toluene, xylene, ethyl acetate, methyl isobutyl ketone, methanol or the like is used. If necessary, additives such as a plasticizer can be added to this solution. In this case, the present antifouling substance is blended at a ratio of 1 ppm to 1%, preferably 50 ppm to 0.5% based on the weight of the solution.

When used as an emulsion, the antifouling substance is dissolved in a solvent, and a surfactant is further added to adjust the emulsion by a conventional method. As the surfactant, generally used surfactants can be used. In this case, the present antifouling substance is blended at a ratio of 1 ppm to 1%, preferably 50 ppm to 0.5% based on the weight of the solution. Further, the present antifouling substance can be used by kneading it into a polymer resin of an underwater material such as a cultured fish net or a fixed net.

[0015]

EXAMPLES The present invention will be described below with reference to examples, but it goes without saying that the present invention is not limited to these examples. [Example] Measurement of adhesion inhibitory property 7-hydroxy-N, N-di-n-propyl-2-aminotetralin hydrobromide (Funakoshi) Balanu
s Amphitrite) was tested by the method of Konya et al. (see Biosci. Biotech. Biochem., 58 (12), 2178-2181, 1994).

The substance dissolved in water was added to a 35 mm-diameter plastic petri dish containing 90% seawater so that the concentration of the substance was 0.3, 0.03, and 0.0003 ppm. Next, ten Cypridium cypris larvae per petri dish were placed, and allowed to stand in a dark place at 23 ° C. for 24 hours, and then the barnacles in the petri dish were observed to examine the adhesion rate. The same test was performed using only 90% seawater (control) as a comparative example. Table 1 shows the results. Note that three dishes were used for each concentration.

[0017]

[Table 1]

The values in the table indicate the barnacle adhesion rates. The control shows the adhesion rate of seawater only. [Formulation Examples] Formulation examples when the antifouling substance of the present invention is used as an antifouling paint are shown below.

[0019]

[0020]

The antifouling agent according to the present invention has an antifouling property, while the conventional organotin compound exhibits antifouling properties by killing attached organisms.
It utilizes the effect of inhibiting only the adhesion function without killing the attached organisms, and provides an excellent harmful water-adhering organism repellent effect.

Claims (1)

[Claims] 1. A compound represented by the following formula (I): An antifouling agent comprising, as an active ingredient, 7-hydroxy-N, N-di-n-propyl-2-aminotetralin represented by the formula: or a pharmaceutically acceptable salt thereof.