JPH08281274A - Sterilizing material for sea water - Google Patents

Abstract

PURPOSE: To breed a fish in a stable state without causing stress and also to prevent a sticking of parasitic vermins on the surfaces and in the gills of fishes, etc., by constituting a sterilizing material for sea water by mixing an alloy powder containing specified amount of pure copper powder or copper to a thermoplastic synthetic resin. CONSTITUTION: This sterilizing material for sea water is constituted by mixing the alloy powder containing at least 60wt.% pure copper powder or copper to the thermoplastic synthetic resin. At this time, a metal powder having, for example, 15-30μm average grain size and <=20wt.% residue on a 250 mesh screen is used to the sterilizing material for sea water. Then, the alloy powder containing at least 60wt.% pure copper powder or copper is mixed to the thermoplastic synthetic resin, for example, by 50-80wt.% and subjected to melt molding to form a pellet. When this sterilizing material is immersed in the sea water, the metal powder dispersed and kneaded in the resin is easily ionized, and various kinds of pathogenic microorganism are killed by this sterilizing, function. Thus, the stress is moreover suppressed due to the elimination of sticking of the parasitic vermins on the surfaces and in the gills to a cultured fish.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sterilizing material for seawater of cultured fish or farmed fish.

[0002]

2. Description of the Related Art It is well known that in the era of 200-barrier restriction, the fishing industry has changed from a fishing industry to a growing one, and in particular, the aquaculture industry has become popular. However, as the production volume increased, the fishing ground environment deteriorated and various fish diseases began to occur. As a countermeasure against this, drugs such as antibiotics for marine use are administered, but as a result, antibacterial action occurs, so it is necessary to develop new drugs against it, and now we are in a state of fish disease and drug weasel. It's no exaggeration to say.

Recently, aquaculture of high-grade fish has been particularly popular, and the most prominent ones are flatfish and puffer fish. However, since these fishes are nervous and their outer coats are weak, it is easy for parasites such as nematodes and gills to parasitize, and various antiseptic agents are used to exterminate them. The bait gets worse during the day. Especially in the summer when the water temperature rises, considerable death is seen. Moreover, it is more difficult in puffer fish culture, and meshing due to stress occurs. If this begins, it will cause mouth rot and will be completely untouched, and most of it will die. It is also true that these things put pressure on the management of aquaculture companies.

Also, in the cultivation of tiger prawns, the development of pathogenic bacteria is completely unsuccessful. Originally, in the case of car shrimp farming, the cultivation period is 10 months, and for the next 2 months, the pond is dried, cultivated with a shovel car or a bulldozer, sterilized with lime, etc., and then left with shrimp. We have reached the present with the repeating pattern, but since the essential seawater sterilization cannot be done, once a pathogenic bacterium is generated, it is in danger of eradication. It is also true that these things put pressure on the management of aquaculture companies.

The same problem also occurs in skipjack fishing boats. That is, the skipjack fishery is a fishing method in which live sardines are used as bait, but when the water temperature rises above 18 ° C, Vibrio bacterium is generated, but sardines are vulnerable to the Vibrio bacterium and most of them die before reaching the fishing ground. The problem is that this is putting pressure on the management of skipjack fishers.

[0006]

However, the above-mentioned disinfection sterilization and fish disease control methods have a poor sustaining effect of chemicals and have a problem in safety. Further, there is no known chemical that suppresses stress and prevents blowfish from engaging with each other. At the same time, a drug with a sustained effect that suppresses sardine stress and suppresses the generation of Vibrio bacteria is also true.

[0007]

The problems of the prior art described above are solved by using, for example, a sterilizing material for seawater produced by the production method according to the present invention. That is, the metal powder used in the sterilizing material for seawater according to the present invention has an average particle size of more than 15 μm and 30 μm or less and a residual amount on a 250 mesh node of 20% by weight or less. A pure copper powder or an alloy powder containing at least 60% by weight of copper is mixed with a thermoplastic synthetic resin in an amount of 50 to 80% by weight and melt-molded to form pellets.

[0008]

The bactericidal material of seawater produced by the method according to the present invention is capable of easily ionizing the metal powder dispersed and kneaded in the resin when immersed in seawater, and killing various pathogenic bacteria by its bactericidal action. Has a bactericidal effect. Therefore, in farmed fish, the fungus and gills do not adhere and the stress is suppressed, which helps prevent blowfish biting. Also, in skipjack fishing boats, it prevents the death of sardines used as food and helps prevent death.

[0009]

The present invention will be specifically described below with reference to examples of the present invention, but it goes without saying that the technical scope of the present invention is not limited to these examples.

[0010]

[Example] 60% by weight of pure copper powder having an average particle size of 15 μm (15% by weight remaining on a 250 mesh node) was uniformly mixed with a Henschel mixer at a ratio of 40% by weight of cellulose acetate, and the axtruder was used. About 240 ~
The mixture is heated and kneaded at 260 ° C., extruded into a string having a diameter of about 3 to 4 mm, cooled, and then cut into a length of about 3 to 4 mm to obtain a sterilizing material for seawater. It has an area of 36 square meters and a water depth of 5
36 kilograms were put into a 0 cm water tank at a rate of 1 kilogram per square meter. The water exchange rate was set to 2 hours, and 300 flounder fry with a body length of about 10 cm were reared and raised. The breeding period was 3 months and started from the middle of April.

[0011]

[Comparative Example] 35% by weight of pure copper powder having an average particle size of 15 μm (15% by weight remaining on a 250 mesh node) was uniformly mixed with a Henschel mixer at a ratio of 65% by weight of cellulose acetate, and was mixed with an axtruder. About 240 ~
The mixture is kneaded by heating at 260 ° C., extruded into a string having a diameter of about 3 to 4 mm, cooled, and then cut into a length of about 3 to 4 mm to obtain pellets. This was put into a water tank having an area of about 36 square meters and a water depth of about 50 cm at a rate of 1 kilogram per square meter and 36 kilograms. The water exchange rate is set to 2 hours, and 3 flounder fry with a length of about 10 centimeters 3
00 tails were reared and raised. The results are as shown in Table 1.

[0012]

[Table 1]

[0013]

EXAMPLE 60% by weight of pure copper powder having an average particle size of 15 μm (15% by weight remaining on a 250 mesh node) was used in a Henschel mixer at a ratio of 40% by weight of a copolymer of nylon 6 and nylon 66. Mix evenly and heat knead to approximately 260-280 ° C using an axtruder to obtain a diameter of approximately 3
Approximately 3-4m in length after extruding into a string of about 4mm and cooling
Cut to m to obtain seawater sterilizing material. This was subdivided into about 3 kilograms of about 54 kilograms at a rate of 1.5 kilograms per square meter in a water tank having an area of about 36 square meters and a water depth of about 80 centimeters, put in a net bag and hung around the water tank. The water exchange rate was set to 8 times a day, and 300 juvenile puffer fish with a body length of about 10 cm were reared and raised. The breeding period was three months and started from the middle of April.

[0014]

[Comparative Example] 35% by weight of pure copper powder having an average particle size of 15 μm (15% by weight remaining on a 250 mesh node) was used in a Henschel mixer at a ratio of 65% by weight of a copolymer of nylon 6 and nylon 66. Mix evenly and heat knead to approximately 260-280 ° C using an axtruder to obtain a diameter of approximately 3
Approximately 3-4m in length after extruding into a string of about 4mm and cooling
Cut into m to obtain pellets. This was subdivided into about 3 kilograms of about 54 kilograms at a rate of 1.5 kilograms per square meter in a water tank having an area of about 36 square meters and a water depth of about 80 centimeters, put in a net bag and hung around the water tank. The water exchange rate is 8 times a day, and the body length is about 1
300 0-centimeter blowfish fry were bred and raised. The results are as shown in Table 2.

[0015]

[Table 2]

[0016]

[Example] 60% by weight of pure copper powder having an average particle size of 15 μm (15% by weight remaining on a 250 mesh node) was uniformly mixed with a Henschel mixer at a ratio of 40% by weight of cellulose acetate, and the axtruder was used. About 240 ~
The mixture is heated and kneaded at 260 ° C., extruded into a string having a diameter of about 3 to 4 mm, cooled, and then cut into a length of about 3 to 4 mm to obtain a sterilizing material for seawater. 300 square meters per square meter in a prawn aquaculture pond with an area of about 100 square meters and a water depth of about 1.5 m.
It was sprayed at a rate of g. The rate of water exchange was natural water exchange twice a day. The number of free-running fish was 300. The breeding period was three months and started from the middle of April. The results are as follows. That is, the number of fish at the time of picking up was 280.

[0017]

[Comparative Example] 35% by weight of pure copper powder having an average particle size of 15 μm (15% by weight remaining on a 250 mesh node) was uniformly mixed with a Henschel mixer at a ratio of 65% by weight of cellulose acetate, and was mixed with an axtruder. About 240 ~
The mixture is kneaded by heating at 260 ° C., extruded into a string having a diameter of about 3 to 4 mm, cooled, and then cut into a length of about 3 to 4 mm to obtain pellets. It has an area of about 100 square meters and a water depth of about 1.5.
It was sprayed at a rate of 300 g per square meter on a m shrimp aquaculture pond. The rate of water exchange was natural water exchange twice a day.
The number of free-running fish was also 300. The results are as follows. That is, the number of fish at the time of picking up was only 32 compared to the examples.

[0018]

EXAMPLE 80% by weight of pure copper powder having an average particle size of 15 μm (15% by weight remaining on a 250 mesh node) was uniformly mixed with a Henschel mixer at a ratio of 20% by weight of cellulose acetate, and the Axtruder was used. About 240 ~
The mixture is heated and kneaded at 260 ° C., extruded into a string having a diameter of about 3 to 4 mm, cooled, and then cut into a length of about 3 to 4 mm to obtain a sterilizing material for seawater. Put this in 4 mesh bags at a rate of 2.5 kilograms per cubic meter in an inboard aquarium with an area of approximately 2.5 square meters and a depth of 2.1 meters and install it in each corner of approximately 1 meter below the water surface. did. The water exchange rate is 1 rotation every 30 minutes as before, and the ion concentration is 0.45P.
It was PM. About 5,000 sardines, which serve as food, were stored in this, and the test period was set to 5 days, and the test was started in early July. The results are as follows. That is, almost no deaths were seen before reaching the fishing grounds. The average water temperature at that time is 2
5 ° C.

[0019]

[Comparative Example] 35% by weight of pure copper powder having an average particle size of 15 μm (15% by weight remaining on a 250 mesh node) was uniformly mixed with a Henschel mixer at a ratio of 65% by weight of cellulose acetate, and was mixed with an axtruder. About 240 ~
The mixture is kneaded by heating at 260 ° C., extruded into a string having a diameter of about 3 to 4 mm, cooled, and then cut into a length of about 3 to 4 mm to obtain pellets. It has an area of about 2.5 square meters and a depth of 2.1 m.
12.5 kg at a rate of 2.5 kg per cubic meter was put in four net bags in the aquarium onboard and installed at each corner about 1 m below the water surface. Water exchange rate is 3 as before
The ion concentration was 0.05 PPM at the rate of 1 rotation per 0 minutes. About 5000 sardines, which serve as a bait, were stored in this, and the test period was set to 5 days, and started simultaneously. The results are as follows. That is, most of them died when they arrived at the fishing ground, compared to the examples.

Examples of the alloy powder containing at least 60% by weight of copper which can be used as the metal powder in the present invention include brass, bronze and nickel-copper alloy.

When the blending amount of the metal powder in the thermoplastic synthetic resin used for the sterilizing material for seawater of the present invention exceeds 90% by weight, the sterilizing effect is not particularly increased, and conversely the mechanical performance of the resin is lowered. It is not preferable because the amount of the metal powder is less than 40% by weight and the bactericidal effect disappears when the amount of the metal powder is less than 40% by weight.

The amount of the metal powder to be used for obtaining the sterilizing material for seawater which is excellent in both mechanical performance and sterilizing effect of the sterilizing material for seawater of the present invention is 40 to 85% by weight, particularly preferably 60 to 80% by weight. %.

The metal powder compounded in the thermoplastic synthetic resin used in the seawater sterilizing material of the present invention has an average particle size of 15 μm.
More than m and 40 μm or less, preferably more than 15 μm and 35 μm or less, particularly preferably more than 15 μm and 30 μm or less.

That is, in order to obtain the mechanical performance of the obtained seawater sterilizing material of the present invention, the average particle size is more than 15 μm and 40 μm.
A metal powder of m or less must be used.

However, the average particle size of the metal powder is 30 μm.
If the amount of the coarse powder remaining on the 250 mesh node exceeds 15% by weight of the metal powder even if it is m or less, the molded product obtained by melt-molding the sterilizing material cannot exhibit sufficient mechanical performance. It is not preferable.

As the thermoplastic synthetic resin used in the seawater sterilizing material of the present invention, there are cellulose acetate resin, cellulose butyrate acetate resin, nylon 6 resin, nylon 66 resin and the like.
These resins may be used alone or as a copolymer. In particular, the polyamide resin is preferably a copolymer. Needless to say, other resins may be used as long as the metal powder dispersed and kneaded in the resin is easily ionized in water and nontoxic.

[0027]

The sterilizing material for seawater produced by the production method according to the present invention is used, for example, in Example 1, Example 2 and Example 1.
6. As shown in Example 18, when used for culturing flounder, puffer fish, prawns, etc., and for storing sardines, the fish can be bred in a stable state without causing stress. Also, almost no deaths were observed during the test period. On the other hand, when the material having a low mixing ratio of the pure copper powder of Comparative Example was used, the effect was not observed at all, and ascites, nematodes, gills and the like adhered to each other, and meshing due to stress occurred, and most of them died.

Since the seawater sterilizing material produced by the method according to the present invention disperses and kneads the metal powder throughout the molded product even if the surface is abraded by seawater, the sterilizing effect should be eliminated. It has the characteristic that it can be maintained over a long period of time.

The sterilizing material for seawater produced by the production method according to the present invention can be used for purposes other than fishing such as sterilization of drinking water for pigs, poultry, etc., sterilization of park sand pits, sterilization of freshwater fish, etc. .

Claims (1)

[Claims] 1. A sterilizing material for seawater, which comprises a thermoplastic synthetic resin mixed with pure copper powder or an alloy powder containing at least 60% by weight of copper.