WO2005080512A1

WO2005080512A1 - Antifouling ship-bottom paint and method of preventing organism attachment to submerged structure, etc. with use thereof

Info

Publication number: WO2005080512A1
Application number: PCT/JP2005/001012
Authority: WO
Inventors: Matsufumi Takaya; Masatsugu Maejima; Isao Nemoto
Original assignee: Nemoto Project Industry Co., Ltd.
Priority date: 2004-02-23
Filing date: 2005-01-26
Publication date: 2005-09-01
Also published as: JP2005272802A

Abstract

[PROBLEMS] To provide an antifouling ship-bottom paint wherein use is made of an antibacterial agent free from the danger of environmental pollution and whose effect is sustained for a prolonged period of time. [MEANS FOR SOLVING PROBLEMS] There is provided an antifouling ship-bottom paint wherein an organic iodine compound, such as iodized polyvinylpyrrolidone or iodized cyclodextrin, is directly or in a form carried on a powdery support, such as coral powder, tourmaline powder or active carbon powder, mixed. The antifouling ship-bottom paint is used on submerged portions of not only ships and vessels but also stakes and waterborne structures.

Description

Specification

Antifouling ship bottom paint and method of preventing biological adhesion to underwater structures using it

Technical field

[0001] The present invention relates to an underwater structure such as a stake or the like under a water line of a floating body such as a ship or a buoy (hereinafter referred to as a floating body or an underwater structure in the present specification). The present invention relates to an antifouling hull bottom paint suitable for use in underwater structures and the like, and a method for preventing biological adhesion to underwater structures and the like using the same.

Background art

[0002] Shellfish and seaweeds, such as barnacles and oysters, adhere to and proliferate on the bottoms of long voyage days, large passenger ships, tankers, etc., and increase running resistance in water. The part of the ship mainly below the waterline is coated with what is called antifouling paint in addition to the usual antifouling paint. Fig. 7 is a conceptual diagram showing the ship S and the antifouling paint section B on the bottom of the ship, Fig. 8 is a schematic diagram of the coating on the bottom of the ship, 1 is the steel plate of the hull, 2 is the first layer of the primer layer, Reference numeral 3 denotes a second layer of anti-fouling paint (also referred to as No. 1 ship bottom paint), and reference numeral 4 denotes a third layer of anti-fouling paint (also referred to as No. 2 ship bottom paint). For small vessels such as FRP, antifouling paint is applied directly to the hull.

[0003] Shellfish and algae are living organisms, so toxic antifouling paints are effective. Paints containing lead and tin have been used for this purpose in the past, but due to the problem of marine environmental pollution. Various paints that are no longer used and are harmless and have only antifouling properties have been developed.

[0004] Patent Document 1 is characterized in that it contains a substituted phenolic compound and a rubamic acid-based compound, and has an antibacterial property to be applied to a cross-flow fan, a filter, or the like in a home or business air conditioner. Antifungal paints are described. Compared with previous antibacterial agents, for example, halogen-based, organic arsenic-based, and quaternary ammonium salts, it has low toxicity and can effectively prevent the attachment and reproduction of microorganisms for a long period of time without risk of environmental destruction. It is.

[0005] Patent Document 2 discloses that ε-polylysine and ε-polylysine salt are used as antibacterial agents, Antimicrobial coatings further containing an ammonium salt are described. ε-Polylysine is an oligopeptide of human essential amino acid L-lysine and is a food preservative recorded in the list of existing additives of the Ministry of Health and Welfare (at that time). The use of natural natural antibacterial agent, eodo, is limited due to its coloring properties, but adding a small amount of it is practically acceptable. This paint is intended to be applied to various products including food containers and dishes, such as metal products, glass products, ceramics, plastic products, and paper products. The result is judged to be true.

[0006] Patent Document 3 describes an antibacterial composition such as a paint in which a silver compound and an organic iodine compound and / or an organic bromide are supported on a carrier such as silica gel, zeolite, calcium phosphate, and other metal compounds. Have been. In the invention described in Patent Document 3, the amount of silver compound, which has been regarded as a safe and long-lasting inorganic antibacterial agent, is sensitive to light, decomposes to form metallic silver, and discolors, so the amount used is limited. The purpose is to improve the problem of being carried out. As the organic iodine compound used, 2,3,3-triodoallyl alcohol and tetraodoethylene are preferred.

Patent Document 1: JP-A-8-277371

Patent Document 2: JP 2001-40273 A

Patent Document 3: JP-A-2000-136107

Disclosure of the invention

Problems to be solved by the invention

[0007] The present invention provides an antifouling hull paint that uses iodine having a low environmental pollution problem as an antibacterial agent, retains the iodine in the coating film as long as possible, and gradually releases it. It is also an object of the present invention to realize a method for preventing biofouling on underwater structures and the like using the same.

Means for solving the problem

[0008] The present invention provides an antifouling ship bottom paint characterized in that an antibacterial agent containing one or both of polyvinylinolepyrrolidone and cyclodextrin is mixed into the paint. Alternatively, the powdery or granular carrier may contain polypyrrolidone or cyclodextrin, An antifouling ship bottom paint characterized in that a paint carrying an antibacterial agent containing at least one or both is mixed in the paint.

[0009] Alternatively, the present invention provides a sheet having a surface coated with the antifouling ship bottom paint, or a cylindrical body obtained by forming the sheet into a cylindrical shape. It is a force that is a pile body in which the ship bottom paint is applied to at least the surface of a portion to be submerged, and a water-floating body formed by applying the antifouling ship bottom paint to at least the surface of the portion to be submerged.

[0010] The present invention is also a method for preventing underwater organisms from adhering to a pile body, wherein the antifouling ship bottom paint is applied to at least the surface of a portion of the pile body to be submerged in water. Or a method for preventing underwater organisms from adhering to a pile, wherein the sheet or the tubular body is mounted on at least the surface of a portion of the pile that is to be submerged in water. Further, there is provided a method for preventing underwater organisms from adhering to floating bodies above water, wherein the antifouling ship bottom paint is applied to at least a surface of a portion to be submerged.

The invention's effect

[0011] According to the present invention, since iodine naturally existing in the sea is used as an antibacterial agent, a long-lasting antifouling bottom paint that eliminates the problem of environmental pollution is realized, and the operating cost of the ship is reduced. This has the excellent effect of reducing the amount of waste and making the maintenance of underwater structures etc. more efficient.

Brief Description of Drawings

FIG. 1 is a perspective view showing a pile body according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a pile according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a pile body according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a pile according to an embodiment of the present invention.

FIG. 5 is a front view showing a use state of the pile body according to the embodiment of the present invention.

FIG. 6 is a front view showing a floating body on water in an example of the present invention.

FIG. 7 is a conceptual diagram showing a ship according to the present invention and its bottom.

FIG. 8 is a schematic view of a coating film on a ship bottom according to the present invention.

Explanation of symbols

[0013] 1 steel plate 2 Primer layer

3 Paint layer

4 Antifouling paint layer

5a sheet

5b long sheet

6 unity

7 Cylindrical body

A anchor

B Antifouling paint department

F floating above water

N nori net

P pile

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] In the present invention, an organic iodine compound is mixed into a ship bottom paint as an antibacterial agent. There are two ways: mixing the finely divided organic iodine compound directly into the paint, and mixing the organic iodine compound impregnated and supported on the particulate carrier into the paint.

[0015] It is important that the organic iodine compound contains iodine having an antibacterial action therein and gradually releases it into water over a long period of time. As an organic iodine compound or an iodine clathrate that has a dense and fine gap in which iodine is impregnated and held, PVPI (polyvinylinpyrrolidone oxide, popidone oxide) or CDI (cyclodextrin oxide, Cyclodextrin-iodine inclusion complex) is most suitable. All of these are in the form of particles extracted from seaweed, marine animals, or iodine in seawater, reacted with a synthetic polymer, polyvinylpyrrolidone-cyclodextrin, and dried. Comparing the two, CDI has a slightly coarser structure than PVPI, is relatively inexpensive, has a higher iodine impregnation rate, but emits iodine faster. CDI lasts for several months and PVPI lasts for more than two years.

[0016] The main purpose of impregnating the particulate carrier is to keep iodine inside and prolong the life. The powdery carrier is made by grinding coral, tourmaline, activated carbon, bamboo charcoal, barley stone, etc. It is. Coral is a calcareous skeleton formed by coral insects, but is also known to be free of other organisms, shellfish and algae in the sea. Coral powder is obtained by pulverizing the coral powder. Tourmaline, also called tourmaline, is a natural stone, but is said to emit a weak electric current or electromagnetic waves, and marine organisms do not adhere to it.

[0017] Activated carbon, bamboo charcoal, barley stone, etc. are, of course, highly adsorptive and bactericidal substances used as filters for water purifiers, air purifiers and the like. .

[0018] One method of impregnating and supporting an organic iodine compound on these granular carriers is a "hot water absorption method". By heating the granular carrier to 30-500 ° C and pouring it into the organic iodine compound liquid at room temperature, the air in the cavity inside the carrier is rapidly cooled, and the inside of the cavity becomes negative pressure. The surrounding liquid enters the gap and becomes impregnated. In order to make the organic iodine compound into a liquid state, it may be dissolved in a solvent such as alcohol or a solvent capable of forming an aqueous solution.

[0019] The paint to be mixed is not particularly limited, but those generally used as ship bottom paints are preferred. However, fine-grained epoxy resin coatings, etc., do not appear on the surface because the antibacterial agent that has been mixed in is trapped in the coating film, and it is difficult to exhibit the antifouling effect.

[0020] The amount of the antibacterial agent mixed into the paint cannot be unconditionally determined because it varies considerably depending on the type of the paint, but a rough guideline for PVPI is an antibacterial agent in a volume ratio of 10% to 60%. Good results were not obtained with too little or too much agent. PVPI contains about 10% of iodine, so it is about 16% net for paint

The present inventors applied the antifouling hull paint of the present invention to a test piece of about 100 × 400 mm and immersed it in a part of a fishing port to conduct a long-term immersion test. The coating was applied and a durability test was performed. As a result, no attachment of shellfish or algae was observed in the product of the present invention for more than two years, and the effect of the present invention could be demonstrated.

[0022] The antifouling ship bottom paint of the present invention is similar to a conventional ship bottom paint, and is generally used for steel structures that come into contact with seawater, such as the inner surface of a cooling seawater conduit of a power plant, in addition to the ship bottom. Is also effective.

[0023] Hereinafter, various examples of use of the antifouling ship bottom paint of the present invention other than the ship bottom will be described. A method for preventing underwater organisms from adhering to underwater structures, etc., using the fouling bottom paint is explained.

FIG. 1 is a perspective view showing a pile body P to be cast on the water floor, and B is an antifouling paint portion directly coated with an antifouling paint. The antifouling paint is applied by brushing, spraying, etc. before placing the pile P. The area to be applied is at least the part that will be underwater, but as far as the purpose is to prevent the adhesion of underwater organisms such as shellfish, it is more effective than the deep sea part where the amount of sunlight incident and the oxygen concentration in the water decrease Since there is no such area, it is effective to have a water depth near the draft line or near the tidal zone up to a depth of about 2 m.

[0025] Fig. 2 is a perspective view showing a pile body P to be cast on the water floor. A sheet with a stain-proof coating applied to a sheet-like sheet 5a is wound around, and necessary parts are bound and fixed with a binding material 6. ing. The planar sheet 5a is a thin sheet such as a rectangular cloth or a resin film. The binding material 6 may be a metal band, a resin band, a wire, a string, or the like.

[0026] By using a sheet body instead of directly applying to the pile body P as described above, when the effect of the antifouling paint is weakened over a long period of use or when the sheet body surface becomes dirty, etc., the pile body P is used. Only the sheet can be replaced as it is.

FIG. 3 is also a perspective view showing a pile body P to be cast on the water floor. The use of a sheet body coated with antifouling paint without directly applying the antifouling paint to the pile body P is the same as in Fig. 2, except that a long sheet 5b is used instead of a rectangular planar sheet. The point of use is different. By wrapping the long sheet 5b like a bandage and fixing the ends with adhesive or the like, the binding material 6 can be eliminated, or the long sheet 5b is pre-manufactured regardless of the wound pile length and coiled. It is convenient because it can be rolled up and stored and transported on site.

FIG. 4 is also a perspective view showing a pile body P to be cast on the water floor. In this example, a sheet 7 coated with an antifouling paint is formed into a cylindrical shape, and a cylindrical body 7 is put on the pile P to form an antifouling paint portion. As in the case of Fig. 2, it can be easily replaced with a new one in case of deterioration in both Fig. 3 and Fig. 4.

FIG. 5 is a front view showing an example of a case where a net for laver cultivation is installed in the sea using the pile body P shown in FIGS. 14 to 14, for example, and N is a laver net. The strut of the laver net to be cast in the sea is not a so-called pile when it is thin, but may be a resin pipe, a wooden pillar, a metal pipe, or the like. Also, if you drive in or out in a short period of time, Provided are also included in the pile of the present invention. The antifouling paint portion B is formed by directly applying the antifouling paint of the present invention or mounting a sheet or a tubular body on at least the surface of the underwater portion of such a pile P. . In the case of seaweed cultivation, nets are pulled up in an annual cycle, and the timing can be used to update the antifouling paint section.

Figure 6 is a front view showing an example of use on a floating body such as a buoy or bontoon, where F is a floating body and A is an anchor. Floating bodies F such as floating lighthouses, buoys as targets for laying objects, and floating piers are floating on the water surface with their positions restrained by guide piles or anchors. The antifouling paint of the present invention is directly applied to at least the surface of the part that will be in water to form the antifouling paint part B. If the shape of the floating body F on water is simple, the above-mentioned sheet body can be used without directly applying. Ships, which are the primary use of antifouling paints, can also be considered as a type of floating body on water.

Claims

The scope of the claims

[1] An antifouling ship bottom paint characterized in that an antibacterial agent containing one or both of polyvinylinopyrrolidodon and cyclodextrin oxide as a main component is mixed into the paint.

[2] An antifouling characteristic characterized in that a powdery or granular carrier carrying an antibacterial agent containing at least one of polybutylpyrrolidone and / or cyclodextrin is mixed into a paint. Bottom paint.

[3] A sheet body on which the antifouling ship bottom paint according to claim 1 or 2 is applied.

[4] A tubular body obtained by molding the sheet body according to claim 3 into a tubular shape.

[5] A pile body in which the antifouling ship bottom paint according to claim 1 or 2 is applied on at least the surface of a portion to be submerged.

[6] A waterborne body obtained by applying the antifouling ship bottom paint according to claim 1 or 2 to at least a surface of a portion to be in water.

[7] A method for preventing underwater organisms from adhering to a pile body, wherein the antifouling ship bottom paint according to claim 1 or 2 is applied to at least the surface of a part of the pile body to be submerged in water. .

[8] Underwater organism attachment to a pile body, wherein the sheet body or the tubular body according to claim 3 or 4 is mounted on at least a surface of a part to be submerged in the water. Prevention methods.

[9] A method for preventing underwater organisms from adhering to floating bodies on water, which comprises applying the antifouling ship bottom paint according to claim 1 or 2 to at least the surface of a portion to be in water.