JPH0368652B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention provides a monofilament with excellent anti-algae properties,
This invention relates to an aquatic biofouling prevention material used as sheets, pipes, wire mesh coverings, etc.

<Conventional technology> It is well known that in the era of the 200 nautical mile limit, Japan's fisheries resources that can be caught have decreased significantly, and as a countermeasure, there has been a shift from fishing to cultivation, and in particular, aquaculture is becoming more popular. That's exactly what it says.
At the same time, the development of fishing gear necessary for aquaculture fisheries has become active, and since fishing gear has problems such as corrosion in seawater or adhesion of various aquatic organisms, it is necessary to prevent corrosion of fishing gear and prevent deposits. Research is underway.

Therefore, traditionally, the ropes and fishing nets used in fishing are
Polyethylene and polypropylene are used, and the coating wire mesh is made of highly abrasion resistant nylon 12.
Those molded from synthetic resin are used,
Although these fishing gears are said to be less susceptible to corrosion by marine bacteria than those made using natural fibers such as cotton thread and hemp thread, a considerable amount of fine particles still grow in spots on the synthetic resin fishing gears. It is well known that the surface of fishing gear is corroded in a concave manner. That is, when fishing gear such as ropes and fishing nets is immersed in seawater for a certain period of time, organic and inorganic suspended substances suspended in the seawater first adhere to it.
Next, algae and hydrozoa such as Shiomidori, Ikusa or Ulva, and Kasane Kanzaki attach to the area, resulting in a large number of minute deposits growing densely.As time passes, moss also attaches, causing areas where the water flow becomes stagnant.
Furthermore, floating larvae such as barnacles develop and easily attach to the net, which stagnates the water flow within the aquaculture net and induces the occurrence of pests and diseases, thereby inhibiting the growth of the aquaculture fish.

In order to deal with the above-mentioned problems, various antifouling agents have been commercially available.For example, fishing nets are soaked in liquid of these antifouling agents, coated with the antifouling agent, and then dried in the sun to become antifouling. Antifouling agents are applied to fishing nets to impart an antifouling effect, but this effect lasts for several months at most, and there is a problem in that the antifouling agent must be applied to fishing nets periodically.

The damage caused by the marine organisms described above is not limited to fishing nets and resin-coated wire meshes, but is also observed in sheets, pipes, etc. used in devices and equipment that use seawater, and is still a major problem.

<Problems to be Solved by the Invention> However, the conventional antifouling methods described above have poor long-term sustainability effects, and antifouling agents and antifouling paints are required for fishing gear such as fishing nets, as well as equipment and equipment that use seawater. There was a problem in that resin-coated wire mesh had to be coated frequently for maintenance and management, and resin-coated wire mesh had to be removed by diving in seawater using a high-pressure pump.

<Means for Solving the Problems> The present invention mixes pure fine copper powder with nylon 6 and nylon 66 to obtain an aquatic organism adhesion prevention material (fishing gear forming material).

<Function> The present invention provides that when a rope, net, sheet, pipe, coated wire mesh, etc. manufactured using the above-mentioned aquatic organism adhesion prevention material is immersed in seawater, it is dispersed and kneaded into the resin molded product of the present invention. The metal powder is ionized in seawater, and its antibacterial action inhibits the growth of bacteria and exhibits a bactericidal action that kills algae such as blue midge.

<Example> The present invention uses nylon 6 and nylon as resin materials.
66 and mixed with pure fine copper powder to create various primary products such as monofilaments, sheets, powder materials, etc., and further use these primary products to achieve various purposes. It is used to mold secondary products (molded products) such as ropes, nets, coated wire meshes, and various other fishing gear depending on the purpose.

That is, copper powder used as a material for forming fishing gear has (1) an average particle size of more than 1 μm and less than 20 μm, and a residual amount on a 250 mesh sieve of less than 8% by weight; (2) Nylon 6 resin 60-85
% by weight or 60-85% by weight of nylon 66 resin. Therefore, in the present invention, any desired shape such as a filament, sheet, or pipe can be obtained by melt-forming, cooling and stretching, for example. Further, the resin-coated wire mesh can be used by melt-extruding an insulating-coated iron wire.

The metal powder blended into the fishing gear forming material of the present invention has an average particle size of more than 1 μm and 20 μm or less, preferably 1 μm.
It is more than 15 μm or less, particularly preferably more than 1 μm and 12 μm or less.

That is, in order to obtain appropriate mechanical performance by melt molding the resulting resin composition, the average particle size must be 1 μm.
Even if the particle size is less than 20 μm, if the amount of coarse powder remaining on the 250 mesh sieve exceeds 8% by weight of the metal powder, the molded product obtained by melt-molding the resin composition will not exhibit sufficient mechanical performance. I don't like it because I don't get it.
Preferred metal powders have an average particle size of 12 μm or less, with a particle diameter of 250 μm or less.
The amount of coarse powder remaining on the mesh sieve is 5% by weight or less of the metal powder. Particularly preferred metal powders have an average particle size of 8 μm or less, and the amount of coarse powder remaining on a 250-mesh sieve is 2% by weight or less, and furthermore, the amount of coarse powder remaining on the sieve is 0.5% by weight or less. Demonstrates particularly excellent performance.

The smaller the average particle size of the metal powder, the better the dispersibility in the resin and the better the mechanical performance of the resin composition.If the average particle size is 1 μm or less, the effect of improving the dispersibility and mechanical performance will not increase much. Not only is this not acceptable, but the price of the metal powder becomes extremely high, and for the purpose of the present invention, it cannot be said that it is preferable to use metal powder having an average particle size of 1 μm or less from an economic point of view.

The amount of metal powder in the fishing gear forming material of the present invention is
If it exceeds 40% by weight, it is undesirable because it causes a decrease in the mechanical performance of the resin molded product without particularly increasing the antibacterial and antialgal effects.On the other hand, if the amount of metal powder is less than 15% by weight, This is not preferable because the antibacterial and antialgal effects are lost. In order to obtain a resin composition that is excellent in both moldability and mechanical performance of resin molded products and antibacterial and antialgal effects, the preferred amount of metal powder blended is 15 to 35% by weight, particularly preferably 20 to 30% by weight.
Weight%.

The nylons used in the fishing gear forming material of the present invention are nylon 6 and nylon 66. Further, as the nylon used for the filament, nylon 6 is particularly preferable. Other types of nylon include nylon 610, 11,
Although these nylons are strong engineering plastics with low water absorption, high surface hardness, and excellent abrasion resistance, they are not suitable for use in the fishing gear molding material of the present invention.

<Effects of the Invention> As described above, the present invention can convert primary products to secondary products using an aquatic biofouling prevention material (fishing gear molding material) obtained by mixing pure fine copper powder with nylon 6 or nylon 66. The molded material has a remarkable antibacterial effect that inhibits the growth of bacteria and kills algae such as blue midge, so it has a remarkable effect of not deteriorating the environment for raising young fish because it does not impede water flow, especially in the case of Ikusu wood.

Claims (1)

[Claims] 1 Nylon 6 or nylon 66 as resin material
A material for preventing the adhesion of aquatic organisms, characterized in that the material obtained by mixing fine copper powder into the material is used as a material for forming fishing gear.