JPH1192317A - Prevention of fouling for immersion structure and immersion structure having antifouling film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the sterilization, pasteurization and prevention of propagation of microorganisms or the like suspending or swimming near the surface for preventing fouling and prevention of the fouling for a long period by forming a TiO2 film on the surface for preventing the fouling of an immersion structure and irradiating the formed TiO2 film with light. SOLUTION: A TiO2 film T is formed on a part including the vicinity of the waterline L1 , preferably the whole surface of ship sides 11 and a ship bottom 12 in an immersion structure X, e.g. a ship 1 such as a tanker to thereby cause a photocatalytic reaction in the part of the TiO2 film T based on the irradiation with sunlight, an ultraviolet lamp or the like especially at the time of anchoring of the ship 1. As a result, the antifouling properties of the whole hull can be improved by preventing actions or the like on the propagation of aquatic organisms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an antifouling method for an immersion structure and an immersion structure having an antifouling film.
The present invention relates to a technique for enhancing the antifouling effect of a water-immersed structure using a photocatalytic reaction.

[0002]

2. Description of the Related Art As a technique relating to an antifouling method and an antifouling film for a water-immersed structure, for example, a paint containing organotin is applied to a hull or a marine structure to enhance the insecticidal effect and to prevent fouling of attached organisms. There is technology.

[0003]

However, heavy metals such as organotin used as an insecticide are effective as an antifouling agent for attached organisms, but are highly toxic to living organisms and hardly decompose naturally. Therefore, if it flows into the ocean, it accumulates in sediment. For this reason, concentration in the body into other beneficial organisms such as sediment organisms progresses, and it cannot be said that it is suitable as an antifouling agent in view of the effect of insecticidal components on living organisms. In addition, ships range from large vessels such as tankers to small vessels such as sports and leisure vessels. There are marine terminals constructed to extract resources and the like, and any of them requires antifouling or anticorrosion treatment to ensure safety. For this reason, the object to be soiled must be able to perform antifouling work regardless of the size and shape of the part to be antifouled, and must be able to easily install and remove work equipment for that purpose. Is desirable. further,
Since these operations tend to be large-scale in any case, it is desirable that the operations be performed at low cost and that maintenance after the operations is required as little as possible. In addition, since workers are exposed to the antifouling agent atmosphere for a long period of time, safety for the human body must be considered.

[0004] The present invention has been made in view of such problems, and has the following objects. Anti-fouling of flooded structures, especially ship and marine structures,
Provide anticorrosion. To prevent the secular change of the surface of the water immersion structure and extend the service life. Improve the maintainability of antifouling work. Prevent marine environmental pollution.

[0005]

Means for Solving the Problems A TiO ₂ film is formed on an antifouling surface of a water immersion structure, and a photocatalytic reaction is generated by irradiating the TiO ₂ film with light. Techniques for sterilizing, sterilizing, and preventing propagation of microorganisms floating or swimming near the surface to be stained by oxidizing power are employed. When the surface to be stained is a metal surface, it is desirable to form an n-type TiO ₂ film by a technique such as spraying n-type TiO ₂ particles having particularly good semiconductor characteristics. Moreover, the antifouling surface (metal surface, non-surface) by coating of the TiO ₂ coating in the case of forming the TiO ₂ film is, TiO ₂ is formed so as to expose the outermost surface. In this case, TiO ₂ is placed on the painted TiO ₂ paint.
₂ Spray fine powder or TiO ₂ particles etc. to support
By increasing the TiO ₂ density on the outermost surface, sterilization, sterilization of microorganisms floating or swimming near the surface to be stained,
Techniques to prevent breeding are adopted. Below the TiO ₂ film, TiO ₂ is by providing the TiO ₂ layer in direct contact, it is possible to enhance the anticorrosion effect of Hibokitana surface that is to be antifouling surface. In submerged structures, T
When the iO ₂ film has a T
A technique of forming so that iO ₂ is exposed is adopted.
When the surface to be stained is the surface of a ship, it is desirable that a TiO ₂ film be formed on at least the entire surface of the ship flank and bottom including the draft line. When the surface to be soiled is the surface of the floodgate (2), it is desirable that a TiO ₂ film is formed at least at a portion including the draft line in the fixed portion, and that the TiO ₂ film is formed between the sea and the atmosphere. It is desirable that a TiO ₂ film be formed on a portion including the movable portion that moves.
As a light source for irradiating the TiO ₂ film, sunlight is mainly employed. However, the irradiation amount is not affected by the natural environment (irregular weather), the planned berthing area of the ship, the location of marine structures, and the like. In order to achieve this, it is an effective technique to install an ultraviolet irradiation lamp or the like in the sea or near the draft line so as to always obtain a stable photocatalytic reaction effect.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of an antifouling method for a water immersion structure and a water immersion structure having an antifouling film according to the present invention. In the figure, symbol X is a water immersion structure, T is T
An iO ₂ film (TiO ₂ layer), 1 is a ship, and L ₁ is a draft line.

The water immersion structure X in the first embodiment is:
It is a ship 1 such as a tanker. The TiO ₂ film T is an antifouling film M, which will be described later, and is formed in a portion including the vicinity of the draft line L _1.
In consideration of the change of the position, the vertical width is given. In addition, the entire surface of the ship side 11 and the ship bottom 12 has T
It is desirable to form the iO ₂ layer T. By forming the TiO ₂ film T on the hull in this way, a photocatalytic reaction is generated on the TiO ₂ film T based on irradiation with sunlight or an ultraviolet lamp, particularly when the marine vessel 1 is anchored. Thus, the antifouling property of the entire hull can be improved by an effect of preventing the propagation of aquatic organisms.

FIGS. 2 and 3 show a water immersion structure according to the present invention.
Antifouling method and second immersion structure having antifouling film
1 shows an embodiment. In the second embodiment, the immersion structure X
Is the lock 2. In the figure, reference numeral 21 denotes a fixed part, 21
a is a U-shaped groove, 22 is a movable part, 23 is a screw, 24 is a driving part
(Eg motor, gearbox), G is quay (land),
U is marine area, L _TwoIs a draft line, and S is a waterway.

In the fixing portion 21, a TiO ₂ film T
There is formed in a portion including at least water line L _2, in the movable portion 22, the TiO ₂ film T is formed on the entire surface, the TiO ₂ film T even in the screw 23 is formed is preferable. When the TiO ₂ film T is formed in this way, a photocatalytic reaction occurs in the portion of the TiO ₂ film T by irradiation of sunlight, and the oxidizing power at that time is applied to both the air atmosphere portion and the water immersion atmosphere portion. In particular, it covers the area where the organisms attach to the highest tide L ₂ ′ area at the time of maximum high tide, and can be soiled by the breeding prevention action described below. The anticorrosion effect can also be improved.

Next, a specific state of formation of the TiO ₂ film T will be described with reference to FIGS.

The first example of FIG. 4 shows a case where the surface 3 to be stain-proofed is a metal surface 31.
It is obtained by forming a TiO ₂ film T by a method such as spraying TiO ₂ directly. The TiO ₂ film T is desirably formed of n-type TiO ₂ particles. By using n-type TiO ₂ , a photocatalytic reaction based on good semiconductor characteristics can be sufficiently exerted, and anticorrosion effect due to a reduction in the corrosion potential of the metal surface 31 due to the photocatalytic reaction upon irradiation with ultraviolet rays is expected. In addition to the strong oxidizing power of the outermost layer, the anticorrosive effect can be enhanced by sterilizing, sterilizing, and preventing propagation of microorganisms floating or swimming near the surface 3 to be contaminated.

The second example shown in FIG. 5 shows a case in which the surface 3 to be soiled is a non-metallic surface 32 such as concrete. After the coating film 4 is formed on the non-metallic surface 32, ( Alternatively, immediately before the formation is completed), the antifouling film M is formed. In the antifouling film M, a TiO ₂ film T is formed by a method such as spraying TiO ₂ particles on the non-metallic surface 32, and T
It is set so that iO ₂ particles are supported at the highest density. Therefore, on the outermost surface of the antifouling film M, similarly to the first example, a strong oxidizing power can be generated by the irradiation of the ultraviolet rays, and the antifouling effect can be enhanced.

In the third example shown in FIG.
Gold on a non-metallic surface 32 such as
When the genus surface 31 is provided, an antifouling film M is formed thereon.
It has been achieved. The antifouling film M is placed on the metal surface 31.
TiO formed_TwoThe film T and the TiO_TwoPainted on film T
And a coating film 4 formed by
TiO _TwoIt has a multilayer structure with the film T and has a metal surface
31 and TiO on the outermost surface_TwoA film T is disposed on the metal surface 3
It has both anti-corrosion and anti-fouling functions on the outermost surface
I'm trying. In addition, between the metal surface 31 and the coating film 4
TiO_TwoIrradiation of the film T with ultraviolet light, for example,
By making it transparent, the coating film 4 can be used as an optical transmission path
This is done by transmitting a wire, etc.
Response.

[0014]

The antifouling method for a water-immersion structure and the water-immersion structure having an antifouling film according to the present invention have the following effects. (1) By forming a TiO ₂ film on the surface to be soiled of the water-immersed structure, a photocatalytic reaction is generated by irradiation of sunlight or the like, and adhesion and propagation of aquatic organisms based on the oxidizing power at that time. And effectively prevent soiling of water-immersed structures, particularly ships and marine structures. (2) By forming a TiO ₂ film on a metal surface or the like, it is possible to reduce the corrosion potential of the surface to be soiled during the photocatalytic reaction, thereby preventing the metal surface from being corroded. (3) A photocatalytic reaction is generated on the surface to be soiled to prevent the aquatic organisms from adhering, whereby the surface of the water-immersed structure can be prevented from aging and its life can be extended. (4) Using sunlight as the main ultraviolet light source, T
By generating a photocatalytic reaction of the iO ₂ film, it is not necessary to provide a special irradiation light source, so that labor for antifouling work and the like can be reduced and maintainability can be improved. (5) Since this is an antifouling method utilizing a photocatalytic reaction of TiO ₂ , the use of an antifouling agent containing a harmful substance is unnecessary as compared with the prior art, and marine environmental pollution can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of an antifouling method for a water immersion structure and a water immersion structure having an antifouling film according to the present invention.

FIG. 2 is a perspective view showing a second embodiment of the method for preventing soiling of a water immersion structure and a water immersion structure having an antifouling film according to the present invention.

FIG. 3 is a plan view showing a second embodiment of an antifouling method for a water immersion structure and a water immersion structure having an antifouling film according to the present invention.

FIG. 4 is a cross-sectional view of an antifouling surface when a TiO ₂ film is formed on a metal surface.

FIG. 5 is a cross-sectional view of an antifouling surface when a TiO ₂ film is formed on a nonmetal surface via a coating film.

FIG. 6 is a cross-sectional view of an antifouling surface when a TiO ₂ film is formed on a metal surface via a coating film.

[Explanation of symbols]

X Immersion structure T TiO ₂ film (TiO ₂ layer) M antifouling 1 Vessel 2 sluice 3 Hibokitana surface 4 coated film 11 tonnage 12 vessel bottom 21 fixing part 21a U-shaped groove 22 the movable portion 23 screw 24 drive unit 31 Metal surface 32 Non-metal surface G Quay (land) U Ocean area L ₁ Draft line L ₂ Draft line L ₂ 'Highest tide S Waterway

Claims (9)

[Claims] An antifouling method for a water-immersed structure (X),
A TiO ₂ film (T) is formed on the surface to be stained (3), and a photocatalytic reaction is generated by irradiating the TiO ₂ film with light. An antifouling method for a water-immersed structure, comprising sterilizing, sterilizing, and preventing propagation of microorganisms floating or swimming in the vicinity. 2. The method according to claim 1, wherein the surface to be soiled (3) is a metal surface (31), and a TiO ₂ film (T) is formed by spraying TiO ₂ on the metal surface.
An antifouling method for the water immersion structure according to the above. 3. The surface to be soiled (3) is a non-metallic surface (32).
The water immersion structure according to claim 1, wherein a coating film (4) is formed by applying a TiO ₂ coating to the non-metallic surface, and TiO ₂ is exposed on an outermost surface of the coating film. Antifouling method for objects. 4. An antifouling surface (3) is a metal surface (31), and a coating film (4) is formed by coating a TiO ₂ coating on the metal surface, and a coating film (4) is formed on the outermost surface of the coating film. T
_{2. The} method according to claim 1, wherein the iO2 is exposed. 5. The antifouling surface (3) is a metal surface (31), and a T film is formed under the coating film (4) on the metal surface.
iO ₂ layer (T) immersion structure with an antifouling film according to claim 3, wherein the is formed. 6. A water immersion structure having a TiO ₂ film (T), characterized in that the TiO ₂ film is formed such that TiO ₂ is exposed on an outermost surface at least in a portion in contact with water. A water immersion structure having an antifouling film. 7. The antifouling surface (3) is the surface of the ship (1), and a TiO ₂ film (at least) including the draft line (L1) and the entire surface of the ship bottom (12). The water immersion structure having an antifouling film according to claim 5, wherein T) is formed. 8. An antifouling surface (3) is a surface of a floodgate (2), and a TiO ₂ film (T) is formed at least in a portion including a draft line (L2) in a fixing portion (21). A water immersion structure having an antifouling film according to claim 5. 9. Hibokitana surface (3) is, sluice with the surface of (2), TiO ₂ film at a portion including a movable portion (22) to move between the sea and in the air (T) A water immersion structure having an antifouling film according to claim 8, wherein