WO2006134656A1 - Coating for preventing buildup of marine organisms - Google Patents

Abstract

Materials to be submerged in seawater over a long time such as ship bottoms, anchors and cultivation fishnets suffer from the buildup of a number of marine organisms (various shellfishes, algae and so on) which inhibit the inherent functions thereof. Thus, it is intended to provide a coating by which the buildup of these marine organisms can be more surely prevented. A coating for preventing buildup of marine organisms to be applied to constructs to be submerged in seawater such as ship bottoms, anchors and cultivation fishnets, which comprises one or more members selected from the group consisting of 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, methylamine, dimethylamine, trimethylamine and aniline. In addition to the above composition, the coating may contain a surfactant for improving the dispersion stability of the constituents.

Description

 Marine organism adhesion prevention paint

 Technical field

 TECHNICAL FIELD [0001] The present invention relates to a coating material for reliably preventing the adhesion of harmful marine organisms adhering to many things placed in the sea for a long period of time.

 Background art

 [0002] Many marine organisms (such as 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, and inhibit their original functions. For this reason, conventionally, measures have been taken to prevent adhesion, such as the application of paints containing repellents composed mainly of metal compounds such as organic tin compounds such as TBT. However, these substances are highly toxic and cause ocean pollution, so their use is being banned, so many alternative substances have been proposed and put into practical use (see, for example, Patent Document 1). However, the current situation is that the removal prevention and repainting work is carried out with a lot of cost and time that is not perfect for their anti-adhesion effect.

 Patent Document 1: Japanese Patent Laid-Open No. 6-256688

 Disclosure of the invention

 Problems to be solved by the invention

[0003] According to the present invention, the adhesion of marine organisms is prevented for a longer period of time, the original function of the undersea installation (boat bottom, anchor, aquaculture fish net, etc.) is maintained, and the deposit removal and repainting operations are performed. The challenge is to reduce time and money.

 Means for solving the problem

 [0004] In order to solve the above-mentioned problem, the marine organism adhesion preventing paint according to claim 1 is made of sodium hydroxide, calcium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate, sodium silicate. Selected from the group consisting of ammonia, aluminum hydroxide, magnesium hydroxide, iron hydroxide (111), hydroxide barium, copper hydroxide (11), methylamine, dimethylamine, trimethylamine, and phosphorus It is characterized by including one kind or two kinds or more.

[0005] The marine organism adhesion prevention paint according to claim 2 is the marine organism adhesion prevention paint according to claim 1. The paint is characterized by containing at least one surfactant selected from nonionic surfactants, anionic surfactants and amphoteric surfactants.

 [0006] In the marine organism adhesion prevention paint according to the present invention, a sufficiently satisfactory marine organism adhesion prevention effect was recognized while the preliminary test and the main test were conducted in a state close to the actual environment. Even when compared with existing ship bottom paints, by adding the additive according to the present invention, the original marine organism adhesion prevention effect can be exhibited for a much longer period of time. It is possible to maintain the original functions of aquaculture fish nets, etc., and to reduce the time and cost required for the removal and repainting of attachments. BEST MODE FOR CARRYING OUT THE INVENTION

[0007] As a method for solving the above problems, the inventors of the present invention added a variety of substances to an existing ship bottom paint to produce a marine organism adhesion prevention paint, and created a test piece applied to an FRP board. This test piece was installed in the sea to see the effect of preventing the attachment of marine organisms.

[0008] The inventors added the substances shown in Table 1 to the existing ship bottom paint, applied the paint sufficiently dispersed by stirring to the FRP plate, and dried it as a test piece.

[0009] [Table 1]

作成したテストピースを海中に吊るし海洋生物の付着状態を観察した。なおテスト 場所は、大阪府泉大津マリーナ桟橋にて常に海水中に没するように吊り下げ設置し て行った。その結果、添加剤 1 (わさびエキス)及び添加剤 5 (消石灰 (水酸ィ匕カルシ ゥム））以外のものについてはフジッボ、ムラサキイガイなどの貝類やイソギンチヤク等 の付着と共に海洋小生物の生息が見られたが、添加剤 1及び添加剤 5については海 洋生物の付着はまったく認められず、付着防止効果が認められた。

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 so that it was always immersed in seawater. As a result, additive 1 (wasabi extract) and additive 5 (slaked lime (hydroxyl In addition to the attachment of shellfish such as barnacles and mussels and sea anemone, the presence of marine small organisms was observed for those other than (Um))). Therefore, an adhesion preventing effect was recognized.

[0011] For further confirmation, the present inventors created test pieces with paints having different addition 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 figure show the results of confirming the state of attachment of marine organisms after being installed in seawater for about one year.

Shown in 1.

[0012] [Table 2]

[0013] From this result, as in the preliminary test, additive 1 (wasabi extract) and additive 5 (slaked lime (hydroxide calcium hydroxide)) were found to have an effect of preventing adhesion of marine organisms. However, it is considered that the anti-adhesion effect has reached its limit with the wasabi extract, since the attachment of marine organisms is partially observed. On the other hand, slaked lime (calcium hydroxide) does not admit marine organisms. It can be said that it has performance. Figure 2 shows a comparison (enlarged photo) of blank and slaked lime (calcium hydroxide).

 [0014] 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. However, when slaked lime (calcium hydroxide hydrate) comes out on the surface, it dissolves in seawater and makes the surroundings alkaline, so that it shows a repellent effect and an effect of preventing adhesion of marine organisms. Therefore, the same alkaline agent (sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate, sodium silicate, ammonia, aluminum hydroxide, magnesium hydroxide, iron hydroxide (III) , Barium hydroxide, copper hydroxide (Π), methylamine, dimethylamine, trimethylamine, and alin). It has an adhesion prevention effect.

 [0015] The amount of the alkaline agent used in the present invention is 0.5 to 50.0% by weight, preferably 3.0 to 20.0% by weight. When the amount of the alkaline agent used is 0.5% by weight or less, there is almost no effect of preventing the adhesion of marine organisms, and when it is 50.0% by weight or more, the dispersibility of the additive in the paint, The performance as a paint, such as application performance and adhesion, is hindered. From this, it is more preferably 3.0 to 20.0% by weight in consideration of workability during coating production, performance as a coating material, marine organism adhesion preventing effect, and the like.

 Furthermore, in order to disperse the powder in the paint more stably, at least one selected from a nonionic surfactant, an anionic surfactant and an amphoteric surfactant as shown in claim 2. More than one type of surfactant may be used.

 Industrial applicability

[0016] The present invention can be applied to a paint for reliably preventing the adhesion of harmful marine organisms that adhere to many things placed in the sea for a long period of time.

 Brief Description of Drawings

[0017] [Fig. 1] shows the state of attachment of marine organisms.

 [Fig. 2] Comparison of adhesion between slaked lime (calcium hydroxide) and blank marine organisms.

Claims

The scope of the claims  [1] sodium hydroxide, calcium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate, sodium silicate, ammonia, aluminum hydroxide, magnesium hydroxide, iron (III) hydroxide, barium hydroxide, water A marine organism adhesion-preventing paint containing one or more selected from the group consisting of copper oxide (11), methylamine, dimethylamine, trimethylamine, and linker.  [2] The paint for preventing adhesion of marine organisms according to claim 1, comprising at least one surfactant selected from a nonionic surfactant, an anionic surfactant and an amphoteric surfactant.