JP2006117894A - Coating for preventing adhesion of marine organism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating for surely preventing adhesion of marine organisms because many marine organisms (various shellfishes, alga and the like) adhere on articles set in the sea for a long term, such as the bottom of a ship, an anchor and an aquafarm fishnet. <P>SOLUTION: The coating for preventing adhesion of marine organisms contains one or more selected from a group consisting of sodium hydroxide, calcium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate, sodium silicate, ammonia, aluminium hydroxide, magnesium hydroxide, ferric (III) hydroxide, barium hydroxide, copper (II) hydroxide, methylamine, dimethylamine, trimethylamine and aniline as a coating for preventing adhesion of marine organism and for being coated on structures set in the sea, such as the bottom of a ship, an anchor and an aquafarm fishnet. The coating for preventing adhesion of marine organisms and containing a surfactant so as to increase dispersion stability of the constituent substance is also provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Detailed Description of the Invention

Technical field to which the invention belongs

  The present invention relates to a coating material for reliably preventing the adhesion of harmful marine organisms that adhere to a large number of objects placed in the sea for a long period of time.

  Many marine organisms (barnacles, mussels, oysters, etc.) adhere to things such as ship bottoms, anchors, and cultured fish nets that remain in the sea for a long period of time, hindering their original functions. For this reason, conventionally, a means for suppressing adhesion such as application of a paint containing a repellent mainly composed of a metal compound such as an organic tin compound represented by TBT has been taken. However, these substances are highly toxic and cause the marine pollution, so their use is being banned, so many alternative substances have been proposed and put into practical use, but their anti-adhesion effect is not perfect, and many costs are high. Currently, periodic removal work and repainting work are performed over time.

Problems to be solved by the invention

  According to the present invention, it is possible to prevent the attachment of marine organisms for a longer period of time, maintain the original function of the undersea installation (boat bottom, anchor, farmed fish net, etc.), and the time and cost required for the removal work and repainting work of the deposit. The challenge is to reduce the risk.

Means for solving the problem

  As a method for solving these problems, the present inventors created a test piece in which various substances were added to existing ship bottom paint and applied to an FRP plate. This test piece was installed in the sea and the adhesion prevention effect of marine organisms was observed.

The inventors added the substances shown in Table 1 to the existing ship bottom paint, applied the paint that was sufficiently dispersed by stirring to the FRP plate, and dried it as a test piece.

  The prepared test piece was suspended in the sea and the state of attachment of marine organisms was observed. The test place was suspended at the Izumiotsu Marina Pier in Osaka Prefecture so that it was always immersed in seawater. As a result, in addition to additive 1 (wasabi extract) and additive 5 (slaked lime (calcium hydroxide)), the presence of marine small organisms was observed along with the attachment of shellfish such as barnacles and mussels and sea anemones. For Additive 1 and Additive 5, no adhesion of marine organisms was observed, and an adhesion preventing effect was observed.

この結果から、予備試験と同様に添加剤１（わさびエキス）及び添加剤５（消石灰（水酸化カルシウム））について海洋生物の付着防止効果が認められた。しかしながら、わさびエキスについては部分的に海洋生物の付着が認められるため付着防止効果が限界にきているものと考えられる。それに対し、消石灰（水酸化カルシウム）については海洋生物の付着は認められないことから、十分海洋生物付着防止剤としての性能を有していると言える。参考写真２にブランク及び消石灰（水酸化カルシウム）の比較（拡大写真）を示す。For further confirmation, the researchers made test pieces with different additive amounts for each additive. These test pieces were suspended from the pier in the sea as before, and the state of marine life was observed.
Table 2 and Reference Photo 1 show the results of confirming the state of attachment of marine organisms after being installed in seawater for about one year.

From this result, the adhesion prevention effect of the marine organism was recognized about the additive 1 (wasabi extract) and the additive 5 (slaked lime (calcium hydroxide)) similarly to the preliminary test. However, it is considered that the anti-adhesion effect has reached its limit for the wasabi extract, since the adhesion of marine organisms is partially recognized. On the other hand, since slaked lime (calcium hydroxide) does not allow the attachment of marine organisms, it can be said that it has sufficient performance as a marine organism adhesion inhibitor. Reference Photo 2 shows a comparison (enlarged photo) of the blank and slaked lime (calcium hydroxide).

  From this result, slaked lime (calcium hydroxide) added to the ship bottom paint does not dissolve in the paint and exists in the form of fine particles, and the paint surface of the ship bottom paint, which is a hydrolyzable paint, peels off by hydrolysis, and slaked lime (water When calcium oxide) comes out on the surface, it dissolves in seawater and becomes alkaline in the surrounding area. Therefore, the same alkaline agent (sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate, sodium silicate, ammonia, aluminum hydroxide, magnesium hydroxide, iron (III) hydroxide, barium hydroxide, copper hydroxide (II ), Methylamine, dimethylamine, trimethylamine, aniline) are also considered to have an effect of preventing adhesion of marine organisms.

The usage-amount of the alkaline agent used by this invention is 0.5-50.0 weight%, Preferably it is 3.0-20.0 weight%. When the amount of the alkaline agent used is 0.5% by weight or less, the adhesion effect of marine organisms is hardly recognized, and when it is 50.0% by weight or more, the dispersibility of the additive in the paint, the coating performance, The performance as a paint such as adhesion is impaired. From this, it is 3.0 to 20.0% by weight more preferably in consideration of workability at the time of coating production, performance as a coating, marine organism adhesion preventing effect and the like.
Furthermore, in order to disperse the powder more stably in the paint, at least one interface selected from nonionic surfactants, anionic surfactants and amphoteric surfactants as shown in claim 2 It is also conceivable to use activators.

The invention's effect

  In the marine organism adhesion preventing paint according to the present invention, a sufficiently satisfactory marine organism adhesion effect was recognized in both the preliminary test and the main test, which were conducted in a state close to the actual environment. By adding the additive according to the present invention even when compared with the existing ship bottom paint, the original marine organism adhesion prevention effect can be demonstrated for a very long time. Etc.) and the time and cost required for the removal work and repainting work can be reduced.

Claims (2)

Sodium hydroxide, calcium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate, sodium silicate, ammonia, aluminum hydroxide, magnesium hydroxide, iron (III) hydroxide, barium hydroxide, copper (II) hydroxide, A marine organism adhesion preventing paint containing one or more selected from the group consisting of methylamine, dimethylamine, trimethylamine and aniline. The marine organism adhesion prevention coating material of Claim 1 containing at least 1 or more types of surfactant chosen from nonionic surfactant, anionic surfactant, and amphoteric surfactant.