JP2006111827A - Antifouling coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit addition of a living thing such as a shell fish to the bottom of a ship, which causes fouling and damage of the bottom of a ship to give remarkably bad influence upon economical transportation by a ship and also to prevent corrosion of a ship. <P>SOLUTION: The antifouling coating comprising a conventional coating for the bottom of a ship and a charge transfer complex (CT complex) is applied to the bottom of a ship, whereby adhesion of a living thing such as a shell fish is prevented and also corrosion is prevented. The CT complex is incorporated in an amount of 1-50% to the solid content, and its particle size is 50 nm to 20 μm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to antifouling paints, and more specifically, various types of fish nets, buoys, and industrial water system facilities including ship bottoms, underwater structures, and aquaculture nets made of various materials such as steel ships, FRP ships, and wooden ships. The present invention relates to an antifouling paint that can prevent the adhesion of marine organisms to seawater or the like, and can adhere to seaweeds, and is suitably used as a biological adhesion prevention paint.

Conventionally, antifouling paints containing rosin and organic tin have been applied to ships, underwater structures, fish nets, etc. to prevent corrosion due to adhesion of marine organisms such as barnacles, mussels and algae, and to prevent a decrease in the navigation speed of ships. ing.
In addition, an antifouling paint containing rosin and organic tin is also applied to the aquaculture net for the purpose of preventing the death of fish and shellfish due to the attachment of various organisms.

  Algae and shellfish that adhere to all parts of the sea, including the bottom of the ship, are attached to the bottom of the ship as if they were carpets. For example, a ship with no deposits can navigate 10 knots at 80% power. If a lot of deposits are attached to this ship, only 5-6 knots will be produced at the same 80% output. As a result, the output is increased and navigation is damaged. In fact, for a ship, deposits are a great resistance to navigation. Increase in engine load Increase in fuel costs 3. On the other hand, in plants where the hull itself is damaged and the driving part is cooled with seawater, the amount of water intake decreases due to the attachment of marine organisms to the piping, and the seizure of the driving engine due to a decrease in cooling efficiency becomes a problem. Yes. For this reason, the following (1) to (3) are used as paints for preventing adhesion of marine organisms.

  (1) Hydrolyzable paint (self-polishing paint): This paint is a so-called dissolved matrix paint. When the paint comes into contact with weakly alkaline seawater having a pH of 8.0 to 8.2, hydrolysis is performed at a constant rate. Occurring, the resin on the surface dissolves to form a new coating surface, and the sterilizing power of copper ions eluted from the coating surface prevents the adhesion of marine organisms. In short, it is said to prevent the adhesion of marine organisms while stacking multiple layers of paint film containing antifouling agent and peeling off each one.

  (2) Hydration-dissolving paint (hydration-decomposition-type paint or hydration-disintegrating paint): This paint is a dissolution matrix-type paint similar to the above-mentioned hydrolysis-type paint, but it is a polymer, cuprous oxide, It is characterized by its main component being rosin collected from pine. Rosin is a natural oligomer composed of abietic acid having a molecular weight of about 300 and its isomer, and has been known for a long time for its slight solubility and affinity for seawater. When the paint film comes into contact with seawater, the surface of the paint slightly dissolves due to the slight solubility of rosin, and chemicals such as cuprous oxide appear on the surface of the paint film. In short, the coating film surface of this paint is always slimy, and the adhesion of marine organisms is prevented by a synergistic effect between the effect of the drug and the surface state to which marine organisms are difficult to adhere.

  (3) Extraction-type paint: This paint is an insoluble matrix-type paint, mainly composed of cuprous oxide, rosin, and hydrophobic synthetic resin. The paint itself does not dissolve, and only the antifouling agent is a matrix. Elutes into seawater. Compared to the above-mentioned dissolution matrix type paint, it is characterized by a high drug content and high coating film hardness.

    However, there is a high need for paints that do not deny the possibility that heavy metal salts (such as cuprous oxide) used in these paints elute into the sea and adversely affect marine organisms.

  Patent Documents 1 and 2 below each disclose an additive and a paint containing the additive in a ship paint for preventing marine organisms from adhering to the ship.

  Among these, the former is a paint obtained by adding a mixture of monazite powder having a predetermined particle diameter and tourmaline that always release negative ions to paint resin (see Patent Document 1).

The latter is a paint obtained by adding at least one selected from bustness stone, monazite, and Chinese complex ore, tourmaline and zirconite to a paint resin (see Patent Document 2).
JP 2000-198965 JP 2002-80315 A

  As mentioned in the background art, many paints for ship bottom use the sterilizing power of copper ions, and show some effects in preventing the attachment of marine organisms depending on seawater temperature, sea area environment, ship operating conditions, etc. However, it is desired to further improve the adhesion prevention effect of marine organisms such as barnacles, shellfish, and seaweeds.

  In addition, in ships using iron or steel materials, rust preventive paint for preventing oxidation by seawater is applied to the bottom of the ship in contact with seawater about 2 to 4 times. Barnacles, shellfish, seaweed, etc. In order to prevent the adhesion of marine organisms, organotin polymers are added to the paint. Since the organotin polymer is a highly bioactive material, adverse effects on other marine organisms, such as the occurrence of fish deformities, have become a problem. For this reason, the use of organotin polymers has been voluntary since the late 1980s. In addition, at the International Maritime Organization (IMO) headquarters in London, the consultation was conducted from June 28 to July 2, 1999, and the use of organotin-containing paints was prohibited on ships in 2003. It was agreed to ban the use. However, at present there is no paint that can effectively prevent the attachment of marine organisms instead, and its development is urgently needed.

  The present invention has been made to solve the above problems, and an object thereof is to provide an antifouling paint having excellent antifouling performance without adversely affecting the marine environment.

  The antifouling paint according to claim 1 is characterized by containing a charge transfer complex.

  The antifouling paint according to claim 2 is characterized in that, in addition to the above structure, the content of the charge transfer complex is 1% to 50% with respect to the solid content of the paint.

  The antifouling paint according to claim 3 is characterized in that, in addition to the above structure, the particle size of the charge transfer complex is from 50 nm to 20 μm.

  The antifouling paint of the present invention comprises a charge transfer complex (CT complex) (see Japanese Patent No. 3514702) and a base paint resin. That is, adhesion of marine organisms such as barnacles, shellfish, and seaweeds can be prevented by the antibacterial, water repellency, camellia oil and negative ion generation effects of the charge transfer complex.

    The primary particle size of the charge transfer complex contained in the antifouling paint of the present invention is preferably 20 μm or less, more preferably 10 μm or less, and particularly preferably 50 nm to 5 μm.

    The content of the charge transfer complex contained in the antifouling paint of the present invention is 0.5 to 50% by weight, preferably 1 to 30% by weight, and particularly preferably 3 to 25% by weight.

  The types of coating resins used in the antifouling paint of the present invention include alkyd resins, amino alkyd resins, vinyl resins, acrylic resins, epoxy resins, urethane resins, unsaturated polyester resins, and chlorinated rubbers. And silicon-based.

  Of these, vinyl resin, acrylic resin, epoxy resin, chlorinated rubber, and silicon are preferable.

  As described above, according to the method of the present invention, by adding the CT complex to the ship bottom paint, it is possible to prevent organisms such as barnacles and shellfish from adhering to the ship bottom, and corrosion is also prevented, and its effective period Is 2 to 3 times more than the conventional one. Therefore, the method of the present invention significantly contributes to cost reduction in terms of ship operating economy.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

    Prepared powder of commercially available CT complex (distributor: Vision Development Co., Ltd.) to 3%, 5% and 10% addition rate to vinyl resin paint (vinyl chloride / 10% vinyl acetate copolymer) The coated paint was applied onto a steel plate test piece coated with a paint mainly composed of bengara and zinc white, and three soil test pieces were prepared. For comparison, a soil comparison test piece was prepared in the same manner using the above-mentioned vinyl resin-based paint not containing a CT complex.

    Each of the test pieces and the comparative test piece were hung on a test ridge, immersed in seawater on a certain beach, and the surface of the test piece was visually observed every 10 days from the start date of immersion. As a result, organisms started to attach to the test piece not containing the CT complex in one month, and after two months, organisms attached to the entire surface of the comparative test piece.

    On the other hand, specimens using CT complex showed almost no effect of the addition rate, and no biofouling was observed until 3 months, and some biofouling was observed from about 4 months, and tests were started from about 5 months. Biofouling was observed on one whole surface.

    Usually, it is necessary to test specimens under the same conditions simultaneously in various parts of the country, and there is also a decrease in peeling of living organisms once attached, so it is said that a long-term test of about 2 years is necessary. As described above, according to the method of the present invention, an effective period of at least two to three times as long as the conventional method was recognized.

Although the steel ship has been described above, the present invention is naturally applicable to a wooden ship.

Claims (3)

Antifouling paint containing a charge transfer complex. The antifouling paint according to claim 1, wherein the content of the charge transfer complex is from 1% to 50% based on the solid content of the paint. The antifouling paint according to claim 1 or 2, wherein the particle size of the charge transfer complex is from 50 nm to 20 µm.