JPS6212763B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a long-acting underwater antifouling agent for effectively and economically preventing aquatic fouling organisms from adhering to objects in contact with water. That is, the present invention relates to an underwater antifouling agent characterized by containing 2-mercaptoimidazoline as an antifouling active ingredient. The adhesion of marine fouling organisms to objects that come in contact with water is a serious hindrance to their maintenance and efficient operation.
Various countermeasures have been attempted in the past, and this is one of the issues to be solved. For example, the adhesion of fouling organisms to the bottom of ships and various underwater installations causes various problems. In ships, it reduces propulsion efficiency and increases fuel consumption, and adhesion to underwater installations sufficiently impedes their function and impedes economical operation. In addition, fishing nets used for aquaculture, which has become popular in recent years, are kept in the sea for long periods of time and are therefore heavily contaminated with marine fouling organisms, resulting in various problems. In other words, in addition to seaweed (such as Ulva), animal barnacles, celluloids, and bryozoans accumulate on aquaculture nets, impairing water flow.
The nets must be replaced every few weeks, especially during the peak of the sessile growth, as this results in a lack of oxygen, which is detrimental to the survival of farmed fish. Considering various factors such as the labor, time, and negative impact on cultured fish caused by this re-netting, it is a considerable loss. Therefore, preventing the attachment of water-fouling organisms is a serious issue. Various antifouling active ingredients have been proposed to prevent the adhesion of these aquatic fouling organisms. Copper compounds and organic tin compounds are generally used. Practically effective compounds include organic tin compounds such as trialkyltin compounds and triphenyltin compounds. However, this organotin compound is generally highly toxic, and products containing it may cause injury to the handler if handled carelessly. In view of the current situation, the inventors of the present invention
It is less toxic to the human body and to seafood than the organotin compounds that are currently commonly used, and is also low toxicity in consideration of environmental pollution, which has recently become a social issue. The present invention was completed as a result of intensive research to develop a low-pollution underwater antifouling agent. The blending amount of 2-mercaptoimidazoline in the underwater antifouling agent of the present invention can be arbitrarily changed depending on the required antifouling performance and antifouling price, and is not particularly limited. Usually these amounts are 100
(by weight) 5 to 40 parts, preferably 10 to 25 parts. The underwater antifouling agent of the present invention may be used in combination with other antifouling active ingredients as optional ingredients, and furthermore,
Mixing does not reduce the effectiveness of the essential ingredients, and a more balanced efficacy against a wide variety of fouling organisms can be expected. Other antifouling active ingredients used for this purpose include tributyltin fluoride, N-(trichloromethylthio)-4-
cyclohexene-1,2-dicarboximide,
Examples include tetrachloroisophthalonitrile, zinc dimethyldithiocarbamate, tetramethylthiuram disulfide, ethylenethiuram monosulfide, copper zincide, etc., and preferably a mixture with tetrachloroisophthalonitrile. In producing the underwater antifouling agent of the present invention, 2-mercaptoimidazoline and tetrachloroisophthalonitrile are mixed and dispersed together with a spreading agent, a solvent, and if desired, a pigment, a filler, etc. using a conventional method (such as a ball mill). All you have to do is knead it. The spreading agent used in the underwater antifouling agent of the present invention includes:
Rosin, boiled oil, chlorinated rubber, alkyd resin,
Examples include various modified alkyd resins, vinyl resins, acrylic resins, polybutene, asphalt, polyurethane, unsaturated ester resins, etc.
Desirable examples include polybutene, acrylic resin, rosin, chlorinated rubber, and vinyl resin. Next, some embodiments of the present invention will be shown, but the present invention is not limited to these. In addition, the blending amounts in the examples are weight percent. Example 1 The underwater antifouling agent of the present invention was adjusted according to the formulation in Table 1, and each polyethylene knotless net (6
After dipping and air-drying the net, it was immersed in Kii Tanabe Bay, Wakayama Prefecture, at a depth of about 1 m below the sea surface, and the state of adhesion of fouling organisms to the net was investigated.

[Table] The results were evaluated according to the following criteria and summarized in Table 2. −: No fouling organisms attached ±: Slight amount of fouling organisms attached, but it is acceptable for practical use as an aquaculture net +: Fouling organisms attached and cannot be used as an aquaculture net 〓: Fouling organisms attached is remarkable

[Table] As can be seen from the above results, the underwater antifouling agent of the present invention exhibited an excellent effect of preventing fouling organisms from adhering to nets. Example 2 An underwater antifouling agent was prepared according to the formulation in Table 3.

【table】

[Table] The underwater antifouling agent obtained according to the formulation shown in Table 3 was applied uniformly with a brush to a test steel plate that had been previously coated with an anticorrosion paint, and then air-dried. The test steel plates obtained were kept immersed in the sea at a depth of 1.5 m in Kiitanabe Bay, Wakayama Prefecture, for one year from May 1973 to May 1974, and the adhesion status of fouling organisms was determined for each test steel plate every two months. investigated. The test results are shown in Table 4. The numbers in the table represent percent adhesion area.

[Table] As can be seen from Table 4, the underwater antifouling agent of the present invention exhibited excellent antifouling effects.

Claims (1)

[Claims] 1. An underwater antifouling agent characterized by containing 2-mercaptoimidazoline as an active ingredient.