JPH07268252A - Network structure to be immersed in sea water - Google Patents

Abstract

PURPOSE:To obtain s network structure to be immersed in sea water which is durable and has a wide antifouling zone without using a toxic material such as an organotin. CONSTITUTION:This structure 1 which becomes an anode in sea water 10 and prevents the deposition of marine organisms by direct current 11 flowing between the structure 1 and a cathode 9 located in the outside sea water with a suitable distance is formed by using a net rope 3 which is obtd. by twisting a plurality of monofilaments 5 using a core comprising a metal foil 4 and a wire, twisting a plurality of the resulting threads 6, and coating or impregnating the resulting rope with a conductive coating compsn. comprising a conductive filler and an org. binder to form a conductive coating film 7.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a seawater immersed network structure.

[0002]

2. Description of the Related Art Since nets that come into contact with seawater are installed in the sea for a long period of time, barnacles, shellfish, etc. adhere to them. Therefore, measures to prevent them from adhering have been taken. The net is treated with a paint or liquid containing an antifouling agent such as an organic tin compound or cuprous oxide. However, with such means, there is a serious problem that harmful substances such as organic metals in the antifouling agent are eluted into the sea and pollute the marine environment. Even if such a treatment is applied to the net, the antifouling effect usually disappears after about three months, so the net must be lifted from the sea to remove the attached organisms and to perform the antifouling retreatment. It will be a big job, including the work of replacing it. Therefore, the applicant of the present invention has previously filed Japanese Patent Application No. 62-32775 as a means for exhibiting an antifouling effect for a long period of time without eluting organic metals.
With No. 4, it becomes an anode by being immersed in seawater, and a net structure that prevents the attachment of marine organisms by flowing a direct current between the outside and the cathode that is arranged at a suitable distance in seawater It was proposed to use a conductive material. That is, when a direct current is applied to the cathode with the conductive network structure as the anode, 2Cl ⁻ → Cl ₂ + 2e and Cl ⁻ + 2O
Due to the reaction of H ⁻ → ClO ⁻ + H ₂ O + 2e, the surface of the conductive network structure is covered with a film of a thick antifouling active ingredient to prevent marine life, but it is the most insoluble conductive material used for this. Long-term experiments with promising carbon fibers revealed that the durability was insufficient.

Therefore, the present applicant has filed Japanese Patent Application No. 63-0574.
With No. 50, it is proposed to form a net-like structure, which becomes an anode by being immersed in seawater, by coating or impregnating it with an electrically conductive paint formed of an electrically conductive filler and an organic binder. did. However, a long-term experiment was conducted on the seawater-immersed network structure used for this, and it was found that the conductivity was sufficient and the antifouling range was narrow.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of such circumstances, and does not use a toxic material such as organic tin, has a high durability, and has a wide antifouling range. It is intended to provide a seawater-immersed network structure.

[0005]

To this end, the present invention is designed to be immersed in seawater to form an anode, and a direct current is passed between the cathode outside the seawater and a cathode arranged at an appropriate distance. In a seawater-immersed net-like structure designed to prevent biological adherence,
The net rope constituting the net-like structure has a plurality of single yarns made of metal foil, and a plurality of child yarns twisted together with a wire as a core, and further made of a conductive compound synthesized with a conductive filler and an organic binder. It is characterized by being formed by applying or impregnating a paint.

[0006]

In the present invention, since the seawater-immersed network structure is used as the anode and the cathode is installed facing the network structure,
Seawater electrolysis makes it possible to prevent marine organisms from adhering to the reticulated structure. Further, since the metal rope or wire such as titanium or titanium / aluminum clad material is woven into the net rope of the net structure, the conductivity is improved. Further, when seawater electrolysis is performed between the net-like structure and the cathode, the metal foil and wire are not electrolyzed because they are coated with a conductive coating film.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment in which the seawater-immersed net-like structure of the present invention is applied to a water channel network will be described. In the perspective view of FIG. 1 (A) and the partially enlarged sectional view of FIG. It is fixed to the wall surface and the intake port of 3 and 3 is a net rope forming a net 1 which is knitted in a lattice shape. The net rope 3 is formed by twisting a plurality of single yarns 5 of non-conductive fiber such as nylon fiber or polyester fiber with a metal foil 4 such as titanium or titanium-aluminum clad material as a core to form a child yarn 6.
Is formed, and a plurality of the child threads 6 are further combined and formed. 7 is a conductive coating film applied to the surface of the net rope 3, which is a metal foil 4 such as titanium or titanium / aluminum clad material.
And the conductive coating film 7 maintain the conductivity, and the conductive coating film 7
As the binder, a resin such as vinyl, urethane, epoxy acrylic or polyester is used as the binder, and carbon powder (graphite, carbon black, etc.), platinum powder or titanium powder is used as the conductive filler. Reference numeral 8 is a direct current power source for rectifying an alternating current to generate a direct current, and energizes the metal foil 4 of the mesh rope 3. Reference numeral 9 denotes a rod-shaped cathode made of iron, steel, carbon, or the like, which is arranged in the seawater 10 outside the net 1 at an appropriate distance, and 11 denotes a direct current flowing out from the net rope 3.

In such a net 1, when a direct current 11 flows from the net rope 3 serving as an anode to the rod-shaped cathode 9, the metal foil 4 is covered with the conductive coating film 7, so that it may be subjected to an electrolytic action. In addition, since the conductive coating film 7 produces an antifouling component due to the electrolytic action, it prevents marine life from adhering thereto. However, according to the net 1, since the marine organisms are prevented from adhering to the net 1 by using electrolysis of seawater instead of using a toxic material such as organic tin, the marine environment is not polluted and therefore environmental protection is high. In addition, the net rope 3 is a metal foil 4
Since the mesh 1 is woven in, the net 1 has good conductivity and thus has a wide antifouling range. Further, when seawater electrolysis is performed between the net 1 and the rod-shaped cathode 9, since the metal foil 4 is covered with the conductive coating film 7, it is not electrolyzed and therefore is not worn and has a high durability.

[0009]

In summary, according to the present invention, a direct current is passed between a cathode which is immersed in seawater to serve as an anode, and a cathode which is disposed at a proper distance in seawater outside the anode to prevent adhesion of marine organisms. In the seawater-immersed net-like structure, the net-like rope constituting the net-like structure is composed of a plurality of single yarns made of metal foil, and a plurality of twisted yarns twisted with a wire as a core. Also, because it is formed by applying or impregnating a conductive paint synthesized with an organic binder, it does not use toxic materials such as organic tin, has high durability, and has a wide range of antifouling seawater immersion network structure. Since the present invention is obtained, the present invention is extremely useful in industry.

[Brief description of drawings]

FIG. 1 shows an intake channel network to which the present invention is applied, and FIG.
Is a perspective view, and FIG. 6B is a partially enlarged sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 mesh 2 water intake channel 3 mesh rope 4 metal foil 5 single thread 6 child thread 7 conductive coating 8 DC power supply 9 rod-shaped cathode 10 seawater 11 DC current

Claims (1)

[Claims] 1. A seawater-immersed net-like structure for preventing the attachment of marine organisms by flowing a direct current between the cathode and a cathode, which is immersed in seawater to form an anode, and which is located outside the seawater at an appropriate distance. In the above, the net rope constituting the above net-like structure is made by combining a plurality of single yarns with a metal foil, and further twisting a plurality of child yarns twisted with a wire as a core, and combining them with a conductive filler and an organic binder. A seawater-immersed network structure formed by applying or impregnating a conductive paint.