JPH10251559A - Water-based antifouling agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antifouling agent against aquatic organisms that has a large antifouling effect against aquatic organisms without anxiety of environmental pollution having high durability. SOLUTION: On at least one face of the supporting part 12, is formed a layer 14 of thermoplastic material that contains a macromolecular organic material and a softening agent, has a hardness A of 0-50 deg. according to JIS, permanent compression set of <=50% at 50 deg.C. This thermoplastic material contains 100-500 pts.wt. of a softening agent per 100 pts.wt. of the macromolecular organic material, has the difference in solubility parameter of <=3.0 between the macromolecular organic material and the softening agent and the macromolecular organic material (1) is selected from a crystalline polyethylene and ethylene/butylene-styrene random copolymer block copolymer prepared by hydrogenation of a polybutadiene and butadiene-styrene random copolymer and (2) a polybutadiene-polystyrene block copolymer and the softening agent is selected from naphthenic or paraffinic hydrocarbons.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material for preventing the adhesion of water-based organisms, and more particularly, to the prevention of adhesion of water-borne organisms such as marine organisms such as shellfish to fixed structures installed in water such as the ocean. To an aqueous biofouling inhibitor for use in

[0002]

2. Description of the Related Art Conventionally, it has been known that various aquatic organisms adhere to the surface of solid materials of fixed structures such as intake pipes and turrets installed in rivers, lakes and marshes, and the ocean, thereby deteriorating the structures. I have. For example, aquaculture base materials such as floats, fences, fish nets,
Power plant intake / drainage pipes, outer surfaces of oil fences,
Mooring lines, underwater turrets and bridge legs, barnacles, mussels, mosses, bryozoans, sponges,
There is a problem that marine organisms such as sea squirts, algae such as diatoms, and aquatic organisms such as seaweeds adhere thereto, deteriorating functions and deteriorating structures.

As a countermeasure for preventing marine organisms from adhering, conventionally, a cuprous oxide-based paint has been applied to a predetermined structure. And maintenance of repainting was needed. In particular, at the water intake of the power plant, removal of shellfish takes a great deal of cost and time for the purpose of (a) prevention of blockage of pumps and pipes by shellfish, and (b) prevention of bad smell during maintenance due to adhesion of shellfish. It is carried out. Furthermore, there is no simple method for disposing of the removed shellfish.

[0004] Further, an organic tin compound is known as having a high adhesion-preventing effect, and is an organic resin which is a resin in which an organic tin compound is introduced into a pendant group of a polymer chain by a chemical bond in order to impart durability. Tin polymers were widely used. However, marine pollution caused by organotin compounds has become apparent, and effective measures to prevent marine organisms from adhering to the sea without the problem of marine pollution have been desired.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned drawbacks, and an object of the present invention is to eliminate the possibility of environmental pollution, and furthermore, have a high aquatic organism adhesion preventing property and a high durability. It is an object of the present invention to provide an aquatic organism adhesion preventing material excellent in water resistance.

[0006]

Means for Solving the Problems In order to achieve the above object, the aquatic organism adhesion preventing material of the present invention contains a high molecular weight organic material and a softening agent on at least one surface of a support member, and has a hardness of JIS K6301 standard. 0 ° to 50 ° on A scale, and the compression set at 50 ° C. is JIS K
It is characterized in that a layer made of a thermoplastic material of 50% or less according to the 6301 standard is formed.

[0007] The layer made of a thermoplastic material is desirably covered over the entire outer periphery of the support member. Further, the layer made of a thermoplastic material (hereinafter, appropriately referred to as a thermoplastic material layer) is made of a polymer. 100 parts by weight of organic material and softener 5
0 to 500 parts by weight, and the difference between the solubility parameters of the high-molecular organic material and the softener is preferably 3.0 or less.

The support member is preferably made of a metal plate or a synthetic resin plate or a mesh (net-like) rigid material made of these materials, depending on the portion to which the aqueous biofouling preventing material is fixed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in more detail. The thermoplastic material in the present invention includes a high molecular weight organic material and a softening agent, and has specific physical properties, and holds a large amount of a low molecular weight softening agent component in an elastic material. It is considered that the softening agent contributes to the control of the physical properties of the thermoplastic material and the effect of preventing the adhesion of aqueous organisms (hereinafter, appropriately referred to as the adhesion preventing effect).

In the present invention, the high molecular weight organic material constituting the thermoplastic material has a number average molecular weight of 20,000.
Above, especially above 30,000, especially above 40,000
The above-mentioned thermoplastic polymer organic materials are preferable. For example, various thermoplastic elastomers such as styrene-based (butadiene-styrene-based, isoprene-styrene-based, etc.), ester-based, amide-based, and urethane-based materials, and hydrogenated and others thereof Modified products, styrene, ABS, olefin (ethylene, propylene, ethylene propylene,
Ethylene styrene type, propylene styrene type, etc.), vinyl chloride type, acrylate type (methyl acrylate type, etc.), methacrylate type (methyl methacrylate type, etc.), carbonate type, acetal type, nylon type, halogenated poly Ether (chlorinated polyether, etc.), halogenated olefin (tetrafluoroethylene,
Thermoplastic resins such as fluorinated-ethylene chloride type, fluorinated ethylene propylene type, cellulose type (acetyl cellulose type, ethyl cellulose type etc.), vinylidene type, vinyl butyral type, alkylene oxide type (propylene oxide type etc.), and Modified rubbers of these resins are exemplified.

[0011] Specific examples of the thermoplastic high molecular organic material include those having both a portion which easily forms a hard block such as a crystal structure and an aggregated structure and a soft block such as an amorphous structure. Preferably, specifically, the following are mentioned.

A block copolymer of crystalline polyethylene and an ethylene / butylene-styrene random copolymer obtained by hydrogenating a block copolymer of polybutadiene and a butadiene-styrene random copolymer.

A block copolymer of polybutadiene and polystyrene, or a block copolymer of polybutadiene or an ethylene-butadiene random copolymer and polystyrene is obtained by hydrogenation. Above all, styrene-ethylene / butylene-styrene block copolymers, such as block copolymers and styrene-ethylene / butylene-styrene triblock copolymers.

A block copolymer in which crystalline polyethylene is linked to one or both ends of an ethylene / butylene copolymer.

[0015] Ethylene-propylene rubber. These various kinds of thermoplastic polymer organic materials are mainly used alone, but two or more kinds may be blended and used.

As the softening agent contained in the thermoplastic material according to the present invention, it is preferable to use a low-molecular material having a number average molecular weight of less than 20,000.
The viscosity at 100 ° C. is 5 × 10 ⁵ centipoise or less,
In particular, it is preferably not more than 1 × 10 ⁵ centipoise, and from the viewpoint of molecular weight, the number average molecular weight is 20,
Less than 000, in particular less than 10,000, especially 5,000
It is preferably 0 or less. Usually, a liquid or liquid material at room temperature is suitably used as such a softener. Further, either a hydrophilic or hydrophobic softener can be used. The softener is not particularly limited, but the following are suitable. Various types of rubber or resin softeners such as mineral oils, vegetable oils, and synthetic oils, and examples of mineral oils include naphthenic and paraffinic process oils. Vegetable oils include castor oil, cottonseed oil, sweet oil, rapeseed oil, soybean oil, palm oil, palm oil, peanut oil, wood wax, pine oil, olive oil, and the like. Above all,
One or more selected from paraffinic oils, naphthenic oils, or polyisobutylene oils of mineral oils, the average molecular weight of which is 100 to 1,
000 is preferred. In the oil preferably used as the softening agent, if the average molecular weight is less than 100, the volatility increases, which is not preferable. If it exceeds 1,000, the softening effect of the thermoplastic material is small, and the average molecular weight is in the above range. Is preferred.

These softeners may be used alone or as a mixture of two or more.

The amount of these softeners is 50 to 1,000 parts by weight based on 100 parts by weight of the high molecular weight organic material.
In particular, the amount is preferably 50 to 500 parts by weight. If the amount is less than 50 parts by weight, the softening effect of the thermoplastic material is small, and if it exceeds 1,000 parts by weight, the bleeding of the softener becomes remarkable, and neither is preferable.

The bioadhesion-preventing material of the present invention is used as a guideline for exhibiting a preferable adhesion-preventing effect and its durability.
° to 50 °, and the compression set at 50 ° C must be 50% or less according to JIS K6301 standards.

The hardness of the thermoplastic material according to the present invention is JIS
If it exceeds 50 ° on the K6301 standard A scale, the hardness of the material becomes high, the holding power of the softener component becomes too large, the desired anti-adhesion property cannot be obtained, and the compression set at 50 ° C is JIS K6301 standard. If it exceeds 50%, the material is deformed with the lapse of time, and the durability of the effect may be reduced.

All of these physical property test methods are based on JIS.
It can be measured according to the K6301 standard.

In order to provide each of the above-mentioned characteristics, it is preferable that the high-molecular organic material constituting the thermoplastic material of the present invention has a three-dimensional continuous network skeleton structure. Means that the average diameter of the skeleton is 50 μm
Or less, preferably 30 μm or less, the average diameter of the cells (mesh) is 500 μm or less, preferably 300 μm or less, and the volume fraction of the high molecular weight organic material is [volume of high molecular weight organic material / (volume of high molecular weight organic material) + Volume of softener)] × 10
When it is defined as 0 (%), the volume fraction of the high-molecular organic material is preferably 50% or less, particularly preferably 33% or less.

In order to obtain a thermoplastic material containing a large amount of the softening agent and a smaller amount of the high molecular weight organic material, the solubility parameter value δ of each of the softening agent and the high molecular weight organic material is used.
= (ΔE / V) ^1/2 (ΔE = molar evaporation energy, V =
It is preferable to select both materials so that the difference in molar volume) is 3.0 or less, preferably 2.5 or less. If the difference exceeds 3.0, the compatibility of the two materials makes it difficult to maintain a large amount of the softening agent, the effect of preventing the obtained thermoplastic material from adhering is reduced, and bleeding of the softening agent is likely to occur. It is not preferable because the continuity of the effect may be reduced.

In the water-based organism adhesion preventing material of the present invention, since the thermoplastic material layer is an elastic body and has a low surface hardness, it is difficult for aqueous organisms to adhere, and even if it adheres, it can be easily removed with a small stress. it can. Further, since the thermoplastic material according to the present invention can hold a large amount of a softening agent in the material, the hardness and modulus can be easily controlled, particularly by adjusting the type and the amount of the high molecular organic compound and the softening agent. And is advantageous for the adhesion preventing effect.

Further, the thermoplastic material used for the aqueous biofouling preventive material of the present invention is characterized in that the liquid softener component retained in the thermoplastic material slightly exudes to the surface,
Biofouling can be more effectively prevented. The conditions under which the liquid low-molecular compound oozes out can be controlled by changing the three-dimensionally continuous network skeleton structure of the thermoplastic material or the dispersion state of the softener, and the magnitude and persistence of the adhesion preventing effect are improved. This also has the advantage that a material with a good balance can be easily designed.

The thermoplastic material according to the present invention can be blended with a polyphenylene ether resin for the purpose of improving the compression set of the material, maintaining the effect, and improving the durability of the formed layer. The polyphenylene ether resin used here is a homopolymer composed of a bonding unit represented by the following formula or a copolymer containing the bonding unit.

[0027]

Embedded image

In the formula, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom, a halogen atom or a hydrocarbon group.

As the polyphenylene ether resin, known resins can be used. Specifically, for example, poly (2,2)
6-dimethyl-1,4-phenylene ether), poly (2-methyl-6-ethyl-1,4-phenylene ether), poly (2,6-diphenyl-1,4-phenylene ether), poly (2- Methyl-6-phenylene-1,
4-phenylene ether), poly (2,6-dichloro-)
1,4-phenylene ether) and the like.
A polyphenylene ether copolymer such as a copolymer of 2,6-dimethylphenol and a monovalent phenol (for example, 2,3,6-trimethylphenol or 2-methyl-6-butylphenol) can also be used. Among them, poly (2,6-dimethyl-1,4-phenylene ether) and a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol are preferable, and further,
Poly (2,6-dimethyl-1,4-phenylene ether) is preferred.

The compounding amount of the polyphenylene ether resin is as follows:
It can be suitably selected in the range of 10 to 250 parts by weight based on the thermoplastic material. If the amount exceeds 250 parts by weight, the hardness of the thermoplastic material is increased and the flexibility is lost.
There is a possibility that the adhesion preventing effect may be reduced, and if the amount is less than 10 parts by weight, almost no improvement in the compression set, which is an effect of the compounding, is hardly observed.

The following fillers may be further added to the thermoplastic material according to the present invention, if necessary. That is, clay, diatomaceous earth, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxide, mica, graphite, scale-like inorganic fillers such as aluminum hydroxide, various metal powders, wood chips, glass powder,
Granular or powdery solid fillers such as ceramic powders, granular or powdery polymers, and other various natural or artificial short and long fibers (eg, straw, wool, glass fiber, metal fiber, and other various polymer fibers) And the like.

In addition, a hollow filler, for example, an inorganic hollow filler such as a glass balloon or a silica balloon, an organic hollow filler made of polyvinylidene fluoride or a polyvinylidene fluoride copolymer is blended, and various foaming agents are mixed and mixed. The material can be made to have a lower density and a lighter weight by, for example, mechanically mixing a gas at the time.

Further, as other additives, if necessary,
Antibacterial agent, hindered amine light stabilizer, ultraviolet absorber,
Antioxidants, inorganic fillers, coloring agents, silicone oils,
A thermoplastic elastomer or resin such as a tackifier such as a coumarone resin, a coumarone-indene resin, a phenol terpene resin, a petroleum hydrocarbon, or a rosin derivative can be used in combination.

It is also preferable from the viewpoint of the effect that the thermoplastic material according to the present invention contains copper. Copper is known for its excellent bactericidal properties and anti-biofouling effect. In addition, copper products are also used in tableware and cooking utensils, and have a proven track record in safety. By adding copper powder or the like to the thermoplastic material according to the present invention, the effect of preventing adhesion is further improved. Further, since a large amount of a softening agent is blended in the thermoplastic material, the viscosity at the time of mixing is low, and a large amount of filler such as copper powder can be blended easily. Therefore, there is an advantage that the adhesion preventing effect of copper itself can be efficiently and continuously exhibited.

The method for producing the aqueous biofouling inhibitor of the present invention is not particularly limited, and a known method can be applied. For example, the respective materials of the thermoplastic material and optionally the additive components are heated and kneaded with a kneader, for example, a single-screw extruder, a twin-screw extruder, a roll, a Banbury mixer, a Brabender, a kneader, a high-shear mixer, or the like. Melt kneading,
Further, if necessary, a crosslinking agent such as an organic peroxide, a crosslinking aid, or the like is added, or these necessary components are mixed at the same time, heated and melt-kneaded, and molded and processed so as to be suitable for a portion where the base material is used. By doing so, it can be easily manufactured.

A thermoplastic material obtained by kneading a high-molecular organic material and a low-molecular material is prepared in advance, and this material is used as one or more high-molecular organic materials of the same type or different types. After further mixing, the mixture can be molded and manufactured.

The thermoplastic material formed into a sheet or a desired shape obtained as described above is fixed to a support member. The support member may be made of a material having rigidity or a material having flexibility. In the present invention, a material made of a material having rigidity is particularly desirable. For example, a metal plate made of iron or the like, a synthetic resin plate made of polyethylene, particularly ultra-high-molecular-weight polyethylene, or a mesh made of metal, synthetic resin, etc. ) Is suitable, and as the flexible material, for example,
A canvas made of glass fiber, polypropylene fiber or the like is suitable.

These materials can adopt any shape required for the support member. . For example, in the case of a support member having rigidity, a flat plate shape, an L shape, a U shape, a rod shape,
A shape such as a sphere can be adopted. In the case of a support member having flexibility, an arbitrary shape can be adopted when the support member is installed because of its flexible property.

As means for forming a layer made of a thermoplastic material on these support members, for example, a layer made of a thermoplastic material may be directly formed on the support member. An adhesive rubber layer may be provided between the support member and the support member to improve the adhesion, or the support member and the thermoplastic material layer may be adhered to each other with a suitable adhesive.

The rubber component forming the adhesive rubber layer should be selected in consideration of the materials of the support member and the thermoplastic material, but is selected from the same material as the polymer material contained in the thermoplastic material. It is preferable to use a material.

The thickness of the thermoplastic material layer formed on the support member depends on the amount of the high-molecular organic material and the softener compounded in the material, the amount of the three-dimensional continuous network skeleton structure formed in the material. Although it depends on the size, etc., it is generally 0.1 to 50 mm
Is preferred. When the thickness of the thermoplastic material layer is less than 0.1 mm, the effect of preventing aqueous organisms from adhering tends to be reduced,
m, there is no remarkable difference in the effect of preventing the adhesion of aqueous organisms,
It is disadvantageous in cost.

The thermoplastic material layer provided on the support member is
What is necessary is just to form on at least one surface of a support member. For example, it may be provided on one surface of the support member, or may be provided on the entire outer periphery of the support member. When the thermoplastic material layer is formed on the entire outer periphery of the support member, the support member is prevented from coming into contact with seawater or the like, so that corrosion of the support member due to rust or the like is prevented. When a thermoplastic material layer is formed over the entire outer periphery of the support member, it is preferable that the surface of the support member is impregnated or coated with a thermoplastic material component that is heated and melted, and then cooled and cured. In particular, when the support member is a support member such as glass fiber or canvas, the above-described impregnation or coating / curing means increases the adhesive strength of the thermoplastic material layer to the support member, and improves durability.

The aqueous biofouling preventive material having the thermoplastic material layer formed on the support member is fixed to any structure requiring aqueous biofouling prevention. Such structures include, for example, floats, fences, culture bases, and the like, in addition to fixed structures installed in rivers, lakes, marshes, oceans, and the like. In the case of a fixed structure, a cooling water intake port of a power plant, particularly a bar screen, a drain port, a pipe, or the like installed near the intake port may be used.

Means for fixing the water-based organism adhesion preventing material to the above-mentioned structure include bolting, rope fixing, adhesion, adhesion and the like, and any means can be adopted according to the structure and its environment. is there. It is not necessary to fix the water-based organism adhesion preventing material semi-permanently to the structure. Removal,
A new water-based biofouling preventive may be installed.

In the aqueous biofouling preventive material of the present invention, since the thermoplastic material layer is supported by the support member, even if the thermoplastic material is deformed with time, the aqueous biofouling preventive material containing the thermoplastic material layer is used. Overall, there is no or very little deformation, so that the aqueous biofouling effect is long lasting.

[0046]

Next, the present invention will be described in detail with reference to specific examples, but the present invention is not limited to the following examples.

FIG. 1 shows an embodiment of the aqueous biofouling inhibitor of the present invention, and FIG. 2 is a sectional view of the aqueous biofouling inhibitor of FIG. The water-based biofouling preventive material 10 has a support member 12 made of a metal plate or a synthetic resin plate provided with a layer 14 made of a thermoplastic material via an adhesive layer 16 and supported inside the layer 14 made of a thermoplastic material. It has a structure in which the member 12 is embedded. Bolt holes 18 are provided at the four corners of the aqueous biofouling preventing material through the thermoplastic material layer 14 and the support member 12, respectively. It is designed to be fixed to a predetermined structure.

Next, the formulation of the thermoplastic material was examined. [Production of thermoplastic material] High-molecular-weight organic material 15 parts by weight (Dinalon: manufactured by Nippon Synthetic Rubber Co., Ltd., molecular weight: about 300,000, SP value: 8.5) Softener: 85 parts by weight of paraffinic oil (PW-32: Idemitsu Kosan) Company, molecular weight 400, SP value 7.4) The above-mentioned raw materials are mixed well at 180 ° C. with a high-shear mixer, and the mixture is formed into a 6 mm-thick sheet, cooled to room temperature and cured. Thus, a thermoplastic material sheet was obtained.

The thermoplastic material had a hardness of 10 ° according to JIS-A and a permanent compression set of 15%. [Evaluation of Aqueous Biofouling Prevention Property] The sheet-like thermoplastic material layer obtained above was cut into 40 × 40 cm, and 1 m × 1
A sample for evaluation was affixed to a polyester canvas of Example 1 (Example 1).

Further, an aqueous biofouling-preventing material was prepared in the same manner as in Example 1 except that the organic polymer material and the softener used were changed as shown in Table 1 below.
To 3 and Comparative Example 1. The physical properties are also shown in Table 1 below.

The details of the ingredients used are as follows. High molecular weight organic material ・ Steron: manufactured by Bridgestone Firestone Co., Ltd., molecular weight: about 150,000, SP value: 8.8 Softener ・ Sansen 4240: manufactured by Nippon Sun Oil Co., Ltd .;
00, SP value 8.0-Polyisobutylene: Nippon Petrochemical Co., Ltd., molecular weight about 3
00, SP value 7.7

[0052]

[Table 1]

Each of the samples was immersed in seawater for 12 months, and the attached state of aquatic organisms was visually observed 3, 6 and 12 months after immersion.

The evaluation criteria for observation are as follows. ：: No adhesion of shellfish, seaweed and algae was observed.

：: Shellfish, seaweed and algae hardly adhere. Δ: Shellfish, seaweed and algae are partially adhered.

×: Shellfish, seaweed, and algae adhered to one surface. Among the above evaluation criteria, “「 ”or more was evaluated as practically effective.

Table 2 shows the results.

[0058]

[Table 2]

As shown in Table 2, Examples 1 to 3 of the present invention
Only a small amount of algae adhered to the part to which the aquatic organism adhesion preventing material was attached, and no adhesion of shellfish was observed, and the adhesion of algae was also small and partial. A large amount of the shellfish and algae were found to adhere to the entire surface of the canvas without the anti-adhesion material. On the other hand, in the case of the thermoplastic material of Comparative Example 1, no effect was observed about three months after the immersion, and it was clear that the durability was poor. From the above results, all the thermoplastic materials according to the present invention achieved high adhesion prevention effect and long-lasting effect. In particular, Example 4 in which copper powder was blended with the thermoplastic material was effective. I understood.

[0060]

As described above, according to the present invention, there is no fear of environmental pollution, and the effect of preventing the adhesion of aquatic organisms is high, and the effect is maintained for a long period of time.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of an aqueous organism adhesion preventing material of the present invention.

FIG. 2 is a sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Aqueous biological adhesion preventing material 12 Support member 14 Layer made of thermoplastic material 16 Adhesive layer 18 Bolt hole

──────────────────────────────────────────────────の Continuation of front page (51) Int.Cl. ⁶ Identification code FI C09D 201/00 C09D 201/00 C09K 3/00 112 C09K 3/00 112D E02B 1/00 301 E02B 1/00 301B

Claims (5)

[Claims] 1. At least one surface of a support member contains a high-molecular organic material and a softener, has a hardness of 0 ° to 50 ° on a JIS K6301 standard A scale, and has a compression set at 50 ° C of JIS K6301. An aqueous biofouling preventive material, comprising a layer made of a thermoplastic material having a standard of 50% or less. 2. The aqueous biofouling preventing material according to claim 1, wherein a layer made of the thermoplastic material is formed on the entire outer periphery of the support member. 3. The method according to claim 1, wherein the thermoplastic material is a high molecular organic material.
3. The composition according to claim 1, further comprising: 00 parts by weight, and 50 to 1000 parts by weight of a softening agent, wherein a difference between solubility parameters of the high-molecular organic material and the softening agent is 3.0 or less. The water-based biofouling preventive material according to claim 1. 4. A block of crystalline polyethylene obtained by hydrogenating a block copolymer of polybutadiene and a random copolymer of butadiene and styrene and a random copolymer of ethylene / butylene and styrene, wherein the high molecular organic material is Copolymer, block copolymer of polybutadiene and polystyrene, or copolymer obtained by hydrogenating block copolymer of polybutadiene or a random copolymer of ethylene-butadiene and polystyrene, ethylene / butylene copolymer 4. A block copolymer in which crystalline polyethylene is linked to one end or both ends of the block copolymer, ethylene-propylene rubber, and at least one selected from the group consisting of: The aqueous biofouling inhibitor according to the above. 5. The water-based biofouling preventing material according to claim 1, wherein the support member is made of a material having rigidity.