JPH0196102A - Repellent for aquatic adhesive life - Google Patents

Abstract

PURPOSE:To provide a repellent for aquatic adhesive life containing safe and inexpensive natural cashew nut oil as an active component and effective for the treatment of the underwater part of ship bottom, fishing net, aquatic construction, etc., and against fishes and algae. CONSTITUTION:The objective repellent for aquatic adhesive life can be produced by using cashew nut oil separable from shell of cashew nut as an active component and forming the component to a proper form such as paint, solution or emulsion. It exhibits strong repelling effect to inhibit the adhesion and proliferation of aquatic adhesive life to the underwater part of e.g. ship bottom fishing net, intake and channel of cooling water of power plant or industrial cooling water, and other underwater construction and exhibits the same adhesion preventive effect against shellfishes and algae. The repellent for aquatic adhesive life has high industrial utility and is extremely advantageous.

Description

[Detailed description of the invention] [Industrial application field]

The present invention is directed to an underwater fouling organism repellent that prevents aquatic fouling organisms from adhering and propagating on the bottoms of ships, fishing nets, power plant cooling water and industrial cooling water intakes and passageways, and other underwater structures. It is something to do.

[Conventional technology]

Submerged equipment and facilities, such as the bottom of ships, fishing nets, power plant and industrial cooling water intakes and passageways, and other underwater structures, are exposed to oysters, Fujibo, mussels, hydrobugs, cellulla, and bryozoans. In water, sessile organisms such as sea squirts, sea squirts, sea breams, sea lettuce, sea cucumbers, algae, and other sessile organisms propagate and cause many problems. For example, ships incur huge losses in terms of wasted fuel and cleaning costs.Also, in the case of cooling water used in heat exchange systems in power plants, etc., a large amount of cost is required to remove these underwater organisms. ing. In addition, in aquaculture fishing nets, problems occur such as the durability of the mesh being impaired or the mesh being blocked and seawater movement becoming insufficient, resulting in various losses. In order to prevent such underwater organisms from adhering to submerged parts, antifouling paints containing cuprous oxide, bis(tri-n-butyltin) oxide, organic chlorine or sulfur compounds, or phenarsazine chloride as active ingredients have conventionally been used. Various types are known. Then, the above-mentioned antifouling paint was applied to the submerged parts, and chlorine, formalin, etc. were injected directly into the intake channel to prevent the adhesion and propagation of underwater organisms.

[Problems to be solved by the invention]

However, these drugs have drawbacks such as being effective in preventing shellfish adhesion but not algae adhesion, or vice versa, and being undesirable from the standpoint of environmental pollution and safety. However, it is not always satisfactory. In other words, antifouling paints containing suboxide steel easily react with varnish components in the paint, resulting in poor storage stability and deterioration and discoloration due to hydrogen sulfide generated by microorganisms in wastewater. Furthermore, it has the disadvantage that it loses its effectiveness, and although it is effective against Fujibbo etc., it has almost no effect on algae. Bis(tri-n-butyltin) oxide is expensive and has a strong odor, making it unfavorable in terms of occupational hygiene. Paints containing organic chlorine or organic sulfur compounds have poor repellent efficacy, and even if they are effective against bryozoans, they are not effective against barnacles. Products containing phenarsazine chloride are irritating to human mucous membranes. Furthermore, chlorine, formalin, and the like are not only less effective in repelling organisms attached to the water, but also corrode submerged equipment and equipment. There is a need for a water-fouling organism repellent that solves the above-mentioned drawbacks, is non-toxic to the human body, and has an excellent adhesion prevention effect against aquatic organisms.

[Means to solve the problem]

The inventor of the present invention solved all the above-mentioned drawbacks of conventionally used aquatic organism repellents and carried out intensive research in order to find a safe and effective substance.
The present inventors have discovered that the oil obtained from e), ie, cashew nut shell oil, has an excellent repellent effect on aquatic organisms, and have completed the present invention. The cashew nut shell oil used in the present invention is collected from the shells of cashew nuts grown in southern India, the eastern coast of Africa, Brazil, Southeast Asia, and the like. The main components of this cashew nut shell oil include cardol, anacardic acid, cardanol, etc. Furthermore, cashew nut shell oil containing acidic components is preferable because of its excellent repellent effect. When collecting cashew nut shell oil, it is desirable to avoid high temperature treatment because anacardic acid is decarboxylated by heating and becomes anacartol. That is, cashew nut shell oil can be obtained by crushing raw or dried cashew nut shells and squeezing out the oil using a roller compressor, or by using a solvent such as ethyl alcohol, n-hexane, or chloroform. It is appropriate to use a manufacturing method that does not involve high-temperature treatment, such as an extraction method. The aquatic organism repellent of the present invention can be obtained by adjusting the cashew nut shell oil as an active ingredient into an appropriate form such as a paint, a solution, or an emulsion. For example, by blending cashew nut shell oil with a film-forming agent such as oil varnish, synthetic resin, or artificial rubber, an underwater biorepellent can be obtained as a paint, and this can be applied to submerged parts such as ship bottoms, underwater structures, and cooling surfaces. By applying it to water intakes, etc., it prevents the adhesion and propagation of underwater organisms. Further, the aquatic organism repellent in the form of a solution or emulsion may be directly injected into the cooling water intake, etc., but in order to maintain the antifouling effect for a long period of time, it is preferable to apply it as a paint to submerged areas. In addition, cashew nut shell oil is dissolved in an organic solvent together with a resin to obtain a repellent for water-fouling organisms in the form of a resin solution, which is impregnated into fishing nets and dried to prevent the adhesion and propagation of water-fouling organisms on fishing nets. You can also do that. The resin used to prepare the resin solution includes vinyl chloride resin, phenol resin, alkyd resin, chlorinated rubber, acrylic resin, etc., and the organic solvent includes benzene,
Toluene, xylene, chloroform, etc. are used. The appropriate amount of cashew nut shell oil to be contained in the paint or resin solution is 0.1 to 50 mJ%, preferably 10 to 20% by weight. There are no particular restrictions on the materials of fishing nets that can be treated with the aquatic organisms repellent of the present invention, such as natural fibers such as cotton, hemp, silk, and wool, polyvinyl chloride, polyvinyl alcohol, polyvinylidene chloride, polyethylene fluoride, and polyamide. It can be applied to fishing nets made of synthetic fibers such as polyethylene, polypropylene, polystyrene, polyacrylonitrile, etc. Next, the present invention will be explained with reference to Examples and Test Examples.

【Example】

Example 1 Cashew nut shell oil 1g1 Acrylic resin (
rNT-100 (manufactured by Nippon Gosei Kagaku Kogyo Co., Ltd.) 20
0 g was thoroughly mixed with 1000 g of xylene to obtain a resin solution which is a product of the present invention. Test Example l Using the resin solution prepared in Marine Organism Antifouling Test Example 1, Amishima Port 3, Shizuoka Prefecture
Tests were conducted in the summer, 00m offshore. A well-polished steel plate (300 x 10 x 100 m x 1) was coated with the resin solution prepared in Example 1''r!, fitted into a wooden frame, and suspended in seawater at a depth of 1.5 m from an immersion raft. It was pulled up at predetermined intervals and the degree of adhesion of underwater organisms was determined by the ratio of the adhesion area to the total area.The percentage indicating the degree of adhesion was judged visually according to the following criteria: When there is no adhesion at all When there is adhesion on April 01 25 When half attached
50 When it adheres to the entire area 100 In addition, as a control product, a product using bis(tri-n-butyltin) oxide instead of the cashew nut shell oil of Example 1 and a product without any chemical additives were prepared and compared. The results are shown in Table 1. Table 1 Test Example 2 Fishing net antifouling test A vinylon fishing net (300
+ m
Air dry for an hour. This was stretched on a steel bar frame, and the same procedure as in Test Example 1 was carried out at a water depth of 1.
It was maintained in 5 m of seawater. Similar to Test Example 1, the test results were compared with the control product and the results are shown in Table 2. Table 2

【Effect of the invention】

Since the repellent for underwater sessile organisms of the present invention uses cashew nut shell oil as an active ingredient, it has a strong repellent effect that prevents aquatic sessile organisms from adhering to and propagating on submerged parts such as ship bottoms, fishing nets, and underwater structures. Similar adhesion prevention effects can be achieved on shellfish and algae. In addition, it is not toxic to the human body and does not have a bad odor, so it is highly safe. Furthermore, since cashew nut shell oil is used, it is inexpensive, has high industrial utility value, and is extremely useful.

Claims (1)

[Claims] (1) A water-fouling organism repellent characterized by containing cashew nut shell oil as an active ingredient.