JPH0543404A - Repellent for aquatic life - Google Patents

Abstract

PURPOSE:To obtain an extremely safe repellent for aquatic life, exhibiting repelling effect against aquatic adhesive life with an extremely small amount and effective for preventing the damage caused by the proliferation or adhesion of the aquatic life by using a monoterpene and/or sesquiterpene as active components. CONSTITUTION:The objective agent contains 0.01-50wt.% of monoterpene and/or sesquiterpene (e.g. limonene, terpineol, citral, citronellal, 1,8-cineole or bisabolene) as active components. The active component is used in the form of an antifouling paint by substituting the conventional antifouling agent or in the form of an aqueous solution or emulsion by using a solubilizing agent or an emulsifier. Essential oils containing monoterpene and sesquiterpene (e.g. orange oil, lemon oil and eucalyptus oil) can be used in the similar manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biorepellent for the purpose of preventing industrial damage caused by the attachment or growth of organisms in seawater or freshwater.

That is, the present invention is, for example, a marine structure, a fishing net, a buoy, a marine structure such as a seawater conduit, which is damaged by attached organisms on the surface of the underwater structure, and which is a cooling function due to the growth of microorganisms in an industrial cooling water system and the attachment of algae. The present invention provides a biorepellent agent that prevents damage such as deterioration and circulation inhibition.

[0003]

2. Description of the Related Art Submarine structures such as ships, marine structures, fishing nets, buoys, seawater conduits, and farm rafts are barnacles, mussels,
Ascidians, algae, etc. adhere to the structure and cause damage such as corrosion of structures, increase in seawater frictional resistance of ships, large amount of hay death of seafood due to clogging of aquaculture nets, sinking due to increased weight, and reduced work efficiency. In addition, bacteria, diatoms, cyanobacteria, blue-green algae, etc. abnormally propagate in industrial water systems that use tap water, river water, lake water, etc. as cooling water, which causes deterioration of water quality and deterioration of cooling efficiency due to adhesion to vessel walls and water pipes. It causes obstacles such as blockage and decrease in flow rate.

In order to prevent the damage caused by the attachment of aquatic organisms, a fishing net antifouling agent containing an organic tin compound and a ship bottom paint have been conventionally used. However, since organotin compounds are highly toxic and have high persistence, the use of organotin antifouling agents was banned in August 1990 from the viewpoint of environmental hygiene and pollution prevention.

[0005]

The fishing net antifouling agents and ship bottom paints containing organotin compounds, which have been used in the largest amount up to now, are highly toxic and persistent, and adversely affect the water surface, especially the marine aquaculture environment. It was For this reason, the use of organotin compounds has been banned in recent years. Therefore, it has been desired to develop an antifouling agent which is an alternative to these organic tin compounds and is free from the concern of environmental pollution.

[0006]

Means for Solving the Problems The above-mentioned object includes an aquatic organism repellent according to the present invention, which contains one or a combination of two or more of the following monoterpenes and / or sesquiterpenes as an active ingredient. Achieved by.

The main compounds are represented by the following constitutions.

Essential oils such as orange oil, lemon oil and eucalyptus oil containing the above monoterpenes and sesquiterpenes can be used.

These active ingredients are replaced with conventionally used antifouling agents in the form of antifouling paints, or solubilizing agents,
It is provided as an aquatic repellent in the form of an aqueous solution or emulsion using an emulsifier.

The terpenes used are widely distributed in the plant kingdom, have good degradability in nature, and are unlikely to remain or accumulate. However, it exerts a repellent effect with extremely small amounts of microorganisms in water, algae or adherent organisms such as shellfish and ascidians. Therefore, the present invention is an extremely safe repellent for aquatic organisms, which has a repellent effect on aquatic organisms and prevents damage caused by the growth or adhesion of these organisms, and which has little toxicity.

When the aquatic organism repellent according to the present invention is used as an antifouling paint or an antifouling agent for fishing nets, one or a combination of two or more terpenes is contained in the coating composition in an amount of 0.01 to 50% by weight, preferably 1%. By including ~ 20% by weight,
It has a strong repellent effect for about one year.

The paint used may be either an organic solvent system or an emulsion system, but preferably an organic solvent system having excellent water resistance. The coating composition may be a known one, for example, when an organic solvent system is used as the resin vehicle,
Homogeneous or copolymers of vinyl chloride resin, vinyl butyral resin, vinylidene chloride resin, chlorinated rubber resin, chlorinated polyethylene resin, chlorinated polypropylene resin, acrylic resin, styrene-butadiene resin, polyester resin, etc. are emulsion type. When using, acrylic emulsion, epoxy emulsion, etc. are used.

On the other hand, when the aquatic repellent according to the present invention is used in a cooling water system or the like, one or a combination of two or more terpenes is used with a solubilizing agent or emulsifying agent and water in a ratio of 3: 1 to 1: 3. The solubilized or emulsified product of 2: 1 to 1: 2 is preferably added to cooling water at a concentration of 0.1 to 100 ppm, preferably 0.5 to 50 ppm to prevent the attachment or reproduction of aquatic organisms. The input method is continuous or intermittent depending on the occurrence of aquatic organisms.

[0014]

The present invention will be described with reference to the following examples. (Example 1) 10 parts of the terpene mixture (d-limonene, d-limonene + 1.8-cineole, d-limonene + citral, orange oil, lemon oil, eucalyptus oil) of the present invention was applied to a vinyl chloride-based paint having the following composition. %, The mixture was applied to a fishing net and dried, and then this fishing net and a fishing net to which the same paint containing no terpene was applied were hung alternately on the raft at intervals of 1 m in width, and the effect of preventing aquatic organisms from adhering was investigated. Experiment from June 1, 1990
I went there for one year until May 31, 1991. Then, the weight of attached organisms was measured at regular intervals, and at the same time, the seeds were fixed by visual observation. The results are shown in Table 1.

The composition of orange oil, lemon oil and eucalyptus oil among the used tempeh mixtures is as follows. ● Orange oil-d-limonene (90%), d-terpineol, citral, d-linalol, etc. ● Lemon oil-d-limonene (90%), citral,
Linalool, γ-bisaborene, d-linalol, etc. Eucalyptus oil-1.8-Cineral, Citronellal, Terpineol, etc.

The vinyl chloride-based coating composition used above is as follows. ○ Vinyl chloride / vinyl acetate copolymer resin (polymerization degree average polymerization degree 500, vinyl acetate content 20% w / w):
30% ○ WW Rosin: 25% ○ Dioctyl phthalate: 1% ○ Colloidal silica: 1% ○ Xylol-benzene (1: 1, v / v): 30% ○ Methyl isobutyl ketone: 8%

[0017]

[Table 1]

Results of observing species of deposits in Table 1 1st to 2nd months Algae attachment 3rd month Blue mussel, Ascidians 6th month 6th month Weight loss due to partial loss 8th month 12th algae attachment

(Embodiment 2) A semi-cylindrical channel (diameter 20 cm, sectional area 0.015 m ² , total length 20) as shown in FIGS. 1 and 2.
The biofouling control test was carried out using m).

That is, a fishing net is fixed at 10m from the inlet,
Flow seawater at a flow rate of 30 liters / min. Add 1 ml of solubilized terpene (terpene content 60%) per liter of seawater,
The amount of biofouling on the fishing net was measured for 10 days, and the fouling was fixed by visual observation. The results are shown in Table 2.

[0021]

[Table 2]

[0022]

As is apparent from the above examples, the aquatic organism repellent according to the present invention has an extremely safe and effective biofouling prevention effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing a water channel used in a second embodiment.

2 is a cross-sectional view of the waterway of FIG.

Front page continuation (72) Inventor Tadamichi Sonoda 2-9-18 Misakicho, Chiyoda-ku, Tokyo Riken Vitamin Co., Ltd.

Claims (2)

[Claims] 1. A repellent for aquatic organisms, which comprises a monoterpene and / or a sesquiterpene as an active ingredient. 2. A repellent for aquatic organisms, which comprises 0.01 to 50% by weight of one or a combination of two or more of the terpenes according to claim 1 as an active ingredient.