JPS5961607A - Antifouling method of underwater structure - Google Patents

Abstract

PURPOSE:To prevent the adherence of water organisms to the surface of an underwater structure by a method in which an antifouling agent is coated on or impregnated into the surface of an antifouling net, and the antifouling net is covered on the surface of the underwater structure. CONSTITUTION:An antifouling agent of an organotin compound, a copper compound, or others is coated on or impregnated into a net made of a metal, a synthetic resin, or a natural fiber to form an antifouling net. The antifouling net is attached as closely as possible to the parts to be immersed in water, covered with water splash, and wetted with ebb and flow of tidal wave of an underwater structure, e.g., oil drill rig, etc. Or, the whole of the underwater structure may be covered with the antifouling net.

Description

[Detailed description of the invention] This invention relates to an antifouling method for underwater structures.

The underwater structure according to the present invention, sea, river, lake, pond,
A structure installed in water such as a waterway (including seawater, hereinafter the same applies), and is primarily a structure that is almost stationary underwater or on the surface of the water. Therefore, the underwater structures of the present invention include structures that move underwater, such as ships. Such underwater structures include:
For example, offshore structures under construction (e.g., oil drilling rigs, etc.), buoy lights, wave-dissipating structures, raft floats, hoots of floating structures, floating piers, oil-proofing structures, mooring lobes,
Examples include power plant waterways, but it is clear that the present invention is not limited to these specific examples.

Offshore structures such as oil drilling rigs are sometimes submerged under water for several months during the construction process, and after completion they are placed above the water surface and operated. However, during the submerged period, aquatic organisms (e.g., bryozoans, amphipods, bivalves,
Since many sea squirts, marine moths, etc. adhere to the structure, it is not aesthetically pleasing if it is placed directly on the water surface, and it requires a great deal of labor and expense to remove the attached aquatic organisms. Conventionally, in order to prevent these defects, antifouling paint has been applied to the submerged areas, but since it is difficult to achieve the various shades specified by customers with this paint, we have not developed an optimal antifouling method. It is impossible to say.

In addition, floating piers, buoys, oil prevention structures (e.g. oil embankments),
When large amounts of aquatic organisms attach to mooring ropes and other structures floating on the water surface, the weight of the structure increases, and as a result, the floating pier gradually sinks into the water and loses its function. In the same way, buoys, oil barriers, etc. are submerged under water and their functions are significantly reduced, and broken mooring ropes also become difficult to handle. Conventionally, in order to prevent these defects, antifouling paint has been applied to the above structures, but when the antifouling performance of the paint deteriorates, repair painting work is extremely difficult. This requires a large amount of man-hours for pre-painting treatment, re-equipment, etc., and causes defects such as the structure not being able to function properly during repair painting.

The present invention was developed in light of the growing situation, and it shows that when an antifouling paint is applied to the surface of the above-mentioned underwater structure (!l
- Finally, we have completed a method for preventing aquatic organisms from adhering to the surface of the underwater structure.

That is, the invention relates to a method of antifouling an underwater structure characterized by covering the surface of the underwater structure with an antifouling net coated with or impregnated with an antifouling agent.

The present invention relates to an antifouling method for underwater structures, and its features include coating the underwater structure with an antifouling net that is coated or impregnated with an antifouling agent, thereby coating the surface of the underwater structure with an antifouling net. Its purpose is to prevent aquatic organisms from adhering to it.

Therefore, according to the method of the present invention, the adhesion of aquatic organisms can be prevented by coating the surface of the underwater structure with the antifouling paint and by covering the surface of the underwater structure with the antifouling net. can be painted with any desired color tone. As a result, the surface of offshore structures such as oil drilling rigs can be coated with paint in any color desired by the customer, and the paint film in submerged areas is covered with an antifouling net. Moreover, there is little or no adhesion of aquatic organisms to the coating film. When the offshore structure is completed and installed on the water surface, the antifouling net can be removed. Also, if the antifouling ability of the antifouling net decreases, you should remove it and apply or reapply the antifouling net with an antifouling agent. It is only necessary to replace the antifouling net with a new antifouling net, and this work is extremely easy compared to the work of repainting with antifouling paint.

In addition, structures floating in the water or on the water surface, such as floating piers, buoys, oil barriers, and mooring ropes, can be covered with antifouling nets to prevent aquatic organisms from attaching to them. It can be prevented.

Because these structures remain suspended in the water for long periods of time, remaining almost stationary, they are more susceptible to aquatic organisms than ships. Therefore, even if antifouling treatment has been applied in advance, the antifouling ability tends to decrease, so it is necessary to periodically repair it.

When repairing (repainting) with conventional antifouling paints, these structures were taken ashore, repaired, and then installed at their original locations. These operations were extremely complicated and required a great deal of effort and expense. However, in the method of the present invention, the above-mentioned antifouling nets need only be replaced at the site where they are installed, without having to unload these structures, so the work is extremely simplified.

The antifouling net used in the present invention can be obtained by coating or impregnating the net with an antifouling agent.

These nets include those made by knitting filamentous materials into a mesh, and those made by punching out cut sheets into a mesh shape.Of these, it is difficult to cover underwater structures easily. It is preferable to use one that is easily flexible.

Suitable materials for the net include metal, synthetic resin, and natural fibers. Examples of metals include steel, stainless steel, copper,
Examples include aluminum, brass, and various types of metal steel. Examples of synthetic resins include polyamide resin, vinyl chloride resin, polyvinyl alcohol,
Polyfluoroethylene, polyolefin, polyester,
Examples include polystyrene, polyacrylonitrile, vinylitine chloride resin, and acrylic resin. Further, as the natural fiber, for example, cotton thread, hemp thread, silk thread, wool thread, etc. are used.

Nets can be obtained by processing these materials into strips and knitting them into a net shape, or by processing the material into a sheet shape and punching it into a suitable shape and size to form a mesh. The thickness of the filamentous material (including those made by inclining several or more thin thread-like materials into W stripes) can be arbitrarily selected depending on the flexibility and strength of the material, but it is preferably in the range of 0.05 to 1 ctn. preferable. The method of knitting these linear objects into a mesh can be adopted by a known method, and the shape of the mesh can be triangular, quadrilateral,
Not limited to hexagons, diamonds, etc., but the size,
- side or diameter of 0.1 to 2 tyn, especially 0.1
~1 m is preferred. In the case of a sheet, the thickness is preferably 0.2 to 2 m, and the shape to be punched out is not particularly limited, such as round, triangular, square, hexagonal, or rhombus, and the size, - The side or diameter is 0.1~
2 m, especially (1,1 to 1 an) is preferable.

In Tokumi F3A, the antifouling agent applied to or impregnated with the above-mentioned net is known per se, and is coated with the purpose of preventing aquatic organisms from adhering to submerged parts of ships and the like. Antifouling agents are used. The antifouling agent used in the present invention can be classified into organic tin compounds, copper compounds, and other antifouling agents.

Organotin compounds can be further subdivided into trialkyltin compounds and triphenyltin compounds, and the former include bis(triethyltin) oxide, triethyltin oxide, bis(triethyltin) oxide, triethyltin chloride, triethyltin fluoride, and bis(triethyltin) oxide. (Tripropyl tablets,) oxide, tripropyltin chloride, tripropyltin fluoride, tributyltin chloride, tributyl@
Fluorite F,) butyltin bromide, tributyltin iodide, tributyltin acetate, bis(tributyl width) oxide, bis(tributyltin) sulfide, tributyltin monochrome loacetate, tributyltin stearate, tributyltin fumarate, tributyltin maleate, Bis(tributyltin) dibromosuccinate, tributyl nicotinate, bis(tricyclohexyl #1) oxide, bis(tricyclohexyltin) sulfide, tricyclohexyltin hydroxide, tricyclohexyltin fluoride, tricyclohexyltin chloride and tricyclohexyltin acetate. Particularly preferred are tripropyl chloride, tributyltin chloride, tributyltin fluoride, bis(tributyltin) oxide, bis(tripropyltin) oxide, and bis(tricyclohexyltin) oxide. In addition, for the latter, triphenyltin hydroxide, triphenyltin chloride, triphenyltin fluoride, triphenyltin bromide, triphenyltin oxide, triphenyl naka 11 tate, triphenyl tin Chloroacetate, triphenyl phthalate, triphenyl tin maleate, triphenyl fumarate, triphenyl octinate, tributyl tin stearate, triphenyl tin 4-nate, triphenyl tin maleate:
Examples include persatate, bis()Q phenyl tsuba,) dibromosuccinate, bis(triphenyl) oxide, and bis(triphenyltin) sulfide h, including G,)lJ phenyltin hydroxide, Phenyltin chloride, triphenyltin acetate, and bis(triphenyltin) oxide are particularly important (
It is preferable.

Examples of needle fastening compounds include cuprous oxide, copper rhodan, copper acid, copper oleate, naphthenic acid button, rosin acid tsuba, hoko glycinate, gold layer 1 copper, chloride 1 tsuba, and hydroxide tsuba. Copper 2, cupric carbonate, etc. are mentioned, and among these, cuprous oxide, copper copper, metal copper, etc. are particularly preferred.

Other antifouling agents include tetramethyl 10-thiclam disulfide, zinc dimethyl dithiocarbamate, 3-chloro-4-phenyl-1,2-dithiol-5-one, 2.3.5.6- Detorachlor 4-(
Examples include methylsulfonyl)-pyridine, detrachloroinphthalonitrile, and N-(chlorophenyl)-2,2'-dipromosuccinimide.

In the present invention, one type or two or more antifouling agents selected from the following can be used together without using any of the other ingredients! However, in order to maintain the antifouling performance during the stirring period, the antifouling agent may be dissolved or dispersed in an organic solvent and applied to or impregnated with the screen. It is preferable to use them in combination (mixing or reaction), and specific examples of their typical compositions are listed below.

(1) An antifouling agent comprising an organic tin compound, more preferably a copper compound and/or an antifouling agent thereof, and a paint resin having little or no carboxyl groups are mixed. composition. The paint resin is preferably soluble in organic solvents and has excellent water resistance, such as vinyl chloride resin, chlorinated rubber, chemical rubber, acrylic resin,
Diene resins, polyolefin resins, etc. are suitable.

(2) A composition in which an organic tin compound is used as an essential effective antifouling agent, and a 4i fat for paints containing a carandoxyl group is used in combination.
Therefore, it is preferable to separate the two components in advance and mix them into the mouthpiece J to be applied or impregnated onto the net. Carboxyl group-containing resin for paints has an acid value of 10 or more, preferably 20 to 150, and examples include alkyd resins,
Acrylic resin etc. are suitable. Further, it is preferable that a copper compound and/or other antifouling agent be added to either or both of the above-mentioned components of the #l'l product.

(3) High-molecular organotin compound, organic tin compound or organotin compound J that reacts with an organotin compound and a carboxyl group-containing resin
The main composition is a polymeric organotin compound which is formed by polymerizing an adduct with a carboxyl group-containing polymerizable unsaturated monocitrus, and more preferably a copper compound, other antifouling agents, tin compounds, etc. A composition containing an antifouling agent. As the carboxyl group-containing resin, an alkyd resin having a silicic acid value of about 30 to 300;
Vinyl resins, acrylic resins, epoxy-modified alkyd resins, etc. are used, and the carboxyl group-containing polymerizable unsaturated monomers include acrylic acid, methacrylic acid, maleic anhydride, fumaric acid, itaconic acid, etc. Adducts include alkyl esters of acrylic acid or methacrylic acid, styrene, vinyl chloride, acrylonitrile, vinyltoluene, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, divinylbenzene, ethylene, furopylene, phtadiene, etc. Even if it is copolymerized, it will not work.

These compositions (1) to (3) are dissolved or dispersed in an organic solvent, and the content of the organic tin compound in the nonvolatile solid content is preferably 5 to 35% by weight, particularly 10 to 25% by weight. , the copper compound is 30 to 70% by weight, especially 40 to 6% by weight.
5% by weight is preferred and the total amount of solid compound is 45% by weight.
~90% by weight, especially 55-85% by weight is preferred.

131 In the present invention, as the antifouling agent, one type or two or more selected from the above-mentioned organotin compounds, copper compounds, and other antifouling agents can be used. The above-mentioned (1) is formed by using a polymeric organotin compound as an essential effective antifouling agent component 2, and a copper compound (particularly preferred are cuprous oxide, copper rhodan, etc.). ) to (3), especially (2) and (3).
) is most preferred.

In the present invention, the method of coating or impregnating the antifouling agent on the net includes immersing the net in an antifouling agent solution, or using a spray, roll coater, curtain flow coater, etc.
This is done by applying (impregnating) the screen with an antifouling agent solution using a method such as ke. The amount of antifouling agent applied or impregnated is 10 to 300 f per 1 m' of netting, depending on the antifouling agent itself.
A suitable weight is 20 to 200 tons. Furthermore, in the present invention, if the mesh is blocked by coating or impregnating with an antifouling agent, it is likely to be agitated underwater, and there is a risk that the antifouling function of the underwater structure may be reduced. 14- Therefore, in order to prevent these, in the present invention, the mesh area of the antifouling net coated with or impregnated with an antifouling agent is
It is preferable that the mesh is 0.3ff1" or more per 1".When using a net that is thin and does not have sufficient corrosion resistance,
Before applying or impregnating with an antifouling agent, it is preferable to apply an anticorrosive paint or coat it with a synthetic resin.

In the present invention, the antifouling net can be easily covered on the surface of the underwater structure. That is, the parts covered with the antifouling net, the submerged parts of the structure, the parts that are splashed with water, and the parts that may or may not be submerged in water depending on the ebb and flow of the tide. The method of covering with the antifouling net is not particularly limited, as long as it is firmly fixed to the surface of the underwater structure to the extent that it will not be stirred up.

For example, the antifouling net is tied from the outside with metal or synthetic resin filaments or strips. Covered by welding, fixing with bolts, bolts, or magnets.

Furthermore, it is no good even if the entire underwater structure is covered with antifouling netting.

In the method of the present invention, in order to prevent aquatic organisms from adhering to underwater structures using the antifouling net, the distance between the antifouling net and the surface of the underwater structure is important, and specifically, the size of the mesh is important. , although it varies depending on the type of antifouling agent, etc., the interval 16
The most preferable age is to maintain within n.
It is to make it adhere to the surface of the structure.

If the antifouling ability of the antifouling net decreases, the antifouling net can be replaced at the site where it was installed, without having to bring the underwater structure ashore.

Next, an example of the present invention will be explained.

Example 1 A net made of vinyl chloride fibers with a thickness of 0.5mm (mesh size 2 x 2 mm) was soaked in an antifouling paint having the following composition and coated to obtain an antifouling net. Ta. Apply amount,
Based on the dry coating, it was 220-260 v/ze.

The surface of the submerged part of the floating pier is tightly covered with the antifouling net,
Examining the antifouling properties in water/ζ. As a result, 12 months after being immersed in the sea, no aquatic organisms were observed on the floating pier or the antifouling net, but after 12 months, some aquatic organisms were observed only on the antifouling net. So I replaced it with a new antifouling net.

Composition of antifouling paint (two-component type) <Liquid A> Rosin liquid 10 parts by weight, chlorinated paraffin 2 parts by weight,
Suboxide #Il 37 parts by weight, red iron 4 parts by weight, talc 2 parts by weight, lead oxide 3 parts by weight, xylene 6 parts by weight, <Liquid B> Chlorinated rubber 7 parts by weight, triphenyltin hydroxide 10 parts by weight , red iron 1 part by weight, xylene 18
Parts by weight: The above liquids A and B were used within one week after being mixed.

Example 2 Wire mesh made of iron wire with a thickness of 1w1M coated with anti-corrosion paint (
An antifouling paint having the following composition was applied to a mesh having a mesh size of 0.5 cm x O, 5 tyn to obtain an antifouling net. The amount of paint applied is 130~180f! It was /-.

17- The submerged part of an oil drilling rig under construction was covered with the antifouling net. The antifouling net and the drilling rig were fixed with bottles so that the distance between them was 1 crn or less. Even after being immersed in the sea for three months, no aquatic organisms were observed to adhere to the surface of the submerged portion of the drilling rig or the surface of the antifouling net.

Composition of antifouling paint: 225 parts by weight of styrene, 20 parts by weight of methyl methacrylate.
0 parts by weight, 150 parts by weight of ethyl acrylate, 69 parts by weight of glycidyl acrylate, and 108 parts by weight of acrylic acid.
High acid value acrylic resin solution (resin acid value 12)
5. 920 parts by weight of triphenyltin hydroxide was added to the solution (solid content 50% by weight) and reacted to obtain a polymeric v&tin compound solution (solid content 50% by weight).

The polymeric organic hook, 30 parts by weight of compound fermentation solution, 4 parts by weight of red red iron, 45 parts by weight of cuprous oxide, 7 parts by weight of rosin, 1 lififi of tricresyl phosphate, 1 part by weight of xylene
3 parts by weight were mixed to prepare an antifouling paint.

Patent applicant (140) Kansai Paint Co., Ltd. 18-

Claims (1)

[Claims] An antifouling method for an underwater structure, comprising covering the surface of the underwater structure with an antifouling net coated with or impregnated with an antifouling agent.