JPH0597610A - Antifouling agent - Google Patents

Abstract

(57) [Summary] [Structure] An antifouling agent containing an unsaturated linear fatty acid as an active ingredient. [Effect] By using a specific active ingredient, excellent antifouling effect is achieved together with high safety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the bottom of ships and fishing nets, equipment placed in the sea such as buoys, underwater structures such as dam auxiliary equipment, water for cooling condensers of thermal power plants or heat of the petrochemical industry. The present invention relates to an antifouling agent that prevents harmful aquatic organisms from adhering to and proliferating in intake channels for water for cooling exchangers.

[0002]

2. Description of the Related Art Barnacles, oysters, mussels, hydras, and hydra are used in parts that are constantly in contact with water, such as the bottom of ships, equipment placed under the sea, underwater structures, and intake channels for cooling water.
Shellfish and algae such as serpra, sea squirts, bryozoans, sea lettuce, sea squirrel, and green algae adhere and propagate, and these adherent organisms increase fluid resistance and decrease thermal conductivity, which is not preferable such as reducing the capacity of equipment. Cause a condition.

Conventionally, various antifouling agents have been used to prevent the adhesion and propagation of such freshwater and seawater pests. As an active ingredient of such an antifouling agent, copper sulfate, cuprous oxide, organotin compounds and the like have been conventionally known,
It is still widely used. These active ingredients are contained in the paint in an amount of 10 to 50% by weight and are continuously eluted in seawater to prevent the attachment of pests.

[0004]

However, recently, while causing social problems such as pollution of the environment such as rivers and seawater by heavy metals and harmful elements, and further harm to the human body through the use of seafood as a medium. Therefore, instructions are also given for the use of organotin compounds and the like in antifouling agents.

Therefore, there is a demand for the development of safe and effective active ingredients which replace conventional antifouling agents.

[0006]

[Means for Solving the Problems] In view of the current situation,
The present inventors are compounds other than organotin compounds,
As a result of intensive studies to develop a compound having high safety and excellent antifouling effect, it was found that unsaturated straight chain fatty acids have a repellent effect on organisms adhering to harmful water, and based on this finding, the present invention was completed. Came to do.

That is, the antifouling agent of the present invention is characterized by containing an unsaturated linear fatty acid as an active ingredient.
In the present invention, the unsaturated straight-chain fatty acid is a fatty acid having 6 to 22 carbon atoms and 1 to 6 carbon-carbon double bonds. For example, undecylenic acid, oleic acid, Examples thereof include linoleic acid, linolenic acid, arachidonic acid, eicosapentaenoic acid, and docosahexaenoic acid.

The unsaturated linear fatty acid used as an active ingredient in the present invention may be used alone or in combination with another antifouling agent. As the unsaturated linear fatty acid, beef tallow containing triglyceride of naturally occurring unsaturated linear fatty acid, in addition to those chemically synthesized,
Animal oil such as lard and fish oil, soybean oil, palm oil,
Mixtures of fatty acids obtained by decomposing vegetable oils such as coconut oil, as well as individual products separated from the mixture can be used.

The antifouling agent of the present invention is prepared and used in the form of paint, solution, emulsion and the like. These preparations can be carried out without any problem by adopting a general prescription usually used. For example, when used as a paint, the above-mentioned active ingredient can be mixed with a paint preparation to prepare an antifouling paint, which can be applied to the bottom of the ship, the underwater structure and the cooling intake. Examples of the film forming agent used at this time include oil varnish, synthetic resin, artificial rubber and the like. If desired, a solvent, an extender pigment or the like can be added to the antifouling paint. In this case, the active ingredient is 1 to 60 based on the weight of the film-forming agent.
%, Preferably 5 to 30%. When the antifouling agent of the present invention is used as a solution, for example, the active ingredient is mixed with a film forming agent to obtain a solution dissolved in a solvent,
This is an aquaculture fishing net for the purpose of preventing the adhesion and reproduction of aquatic organisms.
It can be applied to stationary fishing nets. As the film forming agent, for example, natural resin, synthetic resin, artificial rubber, etc. are used, and as the solvent, for example, toluene, xylene, cumene, chloroform, methyl isobutyl ketone, etc. are used. If necessary, additives such as a plasticizer can be added to this solution. When used as a solution, the active ingredient is 1-60%, preferably 5% by weight of the solution.
It is mixed at a ratio of ~ 30%. When used as an emulsion, the active ingredient is dissolved in a solvent, and a surfactant is further added to prepare an emulsion by a conventional method. Commonly used surfactants are used. When used as an emulsion, the active ingredient is blended in a proportion of 0.5 to 50%, preferably 2 to 30% based on the weight of the emulsion. This agent can also be used by kneading it into a polymer resin that is a material for underwater use such as aquaculture fishing nets and stationary nets.

[0010]

INDUSTRIAL APPLICABILITY The antifouling agent of the present invention is a compound whose active ingredient is derived from a natural product and is highly degradable in the natural world, and has high safety for both human body and environment. Moreover, while conventional organotin compounds show antifouling properties by killing adherent organisms, the antifouling agent of the present invention has an action of inhibiting only the adherent function without killing adherent organisms and is harmful. It is highly safe against fish and seafood as well as having excellent repellent effect on adhered organisms in water.

[0011]

EXAMPLES The present invention will be described in more detail below with reference to examples, comparative examples and formulation examples, but the scope of the present invention is not limited to these. [Examples and Comparative Examples] The unsaturated linear fatty acids undecylenic acid, eicosapentaenoic acid, and docosahexaenoic acid were used to determine the adhesion-preventing effect of mussels by the method of Ina et al.
(K.Ina, R.Takasawa, A.Yagi, N.Yamashita, H.Etoh a
nd K. Sakata, Agric. Biol. Chem., 53 , 3319 (1989)). That is, the test compound was chloroform 1
It was dissolved in ml and applied in a circle on a test paper with a diameter of 4 cm. After drying, attach 4 blue mussels to the outer circumference of the coating circle at 20 ° C.
It was left standing in the running water of the seawater. After 3 hours, the blue mussels formed new attached byssus. Check the number of attached assimilation,
The adhesion inhibition effect was evaluated. As a comparative example, copper sulfate 25 mg
A similar test was conducted using only and chloroform. The results are shown in Table 1.

[0012]

[Table 1]

[Formulation Example 1] A formulation example when the antifouling agent of the present invention is used as a coating material is shown below.

Claims (2)

[Claims] 1. An antifouling agent comprising an unsaturated linear fatty acid as an active ingredient. 2. The antifouling agent according to claim 1, wherein the unsaturated linear fatty acid is undecylenic acid.