JP6535842B1 - Antifouling paint - Google Patents

Abstract

An object of the present invention is to reduce the adhesion of marine life to a ship's bottom, marine structures, fishing nets and the like and to increase fuel efficiency of ships and the like, and to improve ship bottoms, underwater structures, aquaculture nets, fishing nets, and buoys. To provide an antifouling paint which is capable of obtaining a prolonged coating adhesion period to an industrial water system and the like and which is free from marine pollution. SOLUTION: An antifouling paint containing the additive for antifouling paint according to the present invention is mainly composed of sulfur powder of 2 to 100 μm in particle diameter and red iron oxide of 0.3 to 0.4 μm in particle diameter. One of the additives for antifouling paints characterized in that it contains 5 to 10% by weight of sulfur and the other contains 4 to 12% by weight of iron oxide (iron). It is possible to have more effectiveness by using an antifouling paint containing sulfur and red iron oxide as main components.

Description

  The present invention relates to an antifouling paint containing sulfur powder and red iron oxide (iron oxide) simultaneously. Concretely, ship bottoms made of various hull materials such as steel ships and FRP ships, underwater structures, aquaculture nets, fishing nets, buoys, marine water adhesion to mining water systems, etc. The present invention relates to an antifouling paint containing sulfur and a red iron oxide (iron oxide) which can be used as a paint.

    Heretofore, antifouling paints containing organotin or rosin have been used for the purpose of removing marine organisms attached to ships, underwater structures, fishing nets, etc. and preventing corrosion or reducing the traveling speed of ships. In addition, paints containing organotin and rosin have also been used in aquaculture nets.

    The use of paints containing organotin and rosin causes a problem that the ecology of living organisms in the sea changes, and the use of antifouling paints containing organotin and rosin has been voluntarily controlled since the late 1980s. In a consultation at the International Maritime Organization (IMO) headquarters, an agreement was reached in 2003 to prohibit the use on ships altogether.

One of the problems with ships is the damage caused by marine organisms attached to the bottom of the ship.
Algae and shellfish adhering to the bottom of the ship become a great resistance of the vessel to be navigated, and even at the same output, the navigation speed is greatly reduced. This has resulted in damage such as increased fuel costs and increased engine load.

Although existing antifouling paints have antifouling effects for 6 months to 1 year, they have been invented to further enhance their antifouling effects. In order to further enhance the antifouling effect of ships, fishing nets, underwater structures, etc., it is intended to prevent and reduce pollution with an additive containing sulfur powder and red iron oxide (iron oxide).
It can not be used for aluminum vessels because the sulfur content causes a chemical reaction with the aluminum and corrodes the aluminum.

      The present invention reduces adhesion of marine organisms to the bottom of a ship, marine structures, aquaculture nets, fishing nets, etc., and improves the fuel efficiency of ships etc., and the bottom of ships, underwater structures, aquaculture nets, fishing nets, buoys, industrial It is intended to provide a ship bottom paint free from the occurrence of marine pollution, as a result of prolonging the paint adhesion period to water-based equipment and the like.

An antifouling paint containing an additive for an antifouling paint mainly composed of sulfur powder having a particle diameter of 2 to 100 μm, which has a repelling effect on marine organisms, and containing 5 to 9.99% by weight of sulfur as an additive paint.

Particle size 0.3 to 0.4 μm red iron oxide (iron oxide Fe2O3), which has a repelling effect on marine organisms, is characterized by containing an additive for antifouling paint and added with 4 to 12% by weight red iron oxide (iron oxide) What is claimed is: 1. An antifouling paint characterized by incorporating as an additive for an antifouling paint at the same time both components together with 5 to 10% by weight of a sulfur content which gives a repelling effect to marine organisms, and has more effective antifouling effect.

    The above-mentioned additives for antifouling paints based on sulfur powder (sulfur content) are added to the paint at a ratio of 5 to 10% by weight with respect to 100% by weight of the paint, mixed and stirred, ship bottom, underwater structure, Apply to fishing nets etc. The antifouling paint containing the additive for antifouling paint according to claim 1 of the present invention is characterized by containing 5 to 10% by weight of sulfur powder (sulfur content). The reason why the percentage of sulfur content is set to 5 to 10% by weight is based on the upper limit of 10% first, as a result of painting at a ratio of 20% in the previous demonstration test It was decided that the upper limit should be 12% because only such results were obtained. In addition, it was judged that the other main ingredients of a ship bottom paint etc. are 5% or more which made 5% a minimum, and 2-3% can not acquire an antifouling effect.

    Additives for antifouling paints based on the iron oxide (iron oxide) mixed simultaneously with sulfur powder are added to paints in a proportion of 4 to 12% by weight with respect to 100% by weight of paint, and ship bottom, underwater structure, Apply to fishing nets etc. The antifouling paint containing the additive for antifouling paint according to claim 2 of the present invention is characterized by containing 4 to 12% by weight of red iron oxide (iron oxide). The proportion of the iron oxide (iron content) contained was 4 to 12% by weight because the proportion of the iron oxide contained in the commercial ship bottom paint was 5 to 10% by weight, so the proportion mixed with sulfur was Since it is 4.25%, it was 4 wt%. The upper limit of 12% by weight is considered to be the same as the sulfur content may occur. Because the valve is heavy, the amount of contamination is kept at 12%. I want to prevent the deposition of paint.

      The present invention is an additive for an antifouling paint containing sulfur powder and red iron oxide (iron oxide), which is said to have a repelling effect on marine organisms, so that the adhesion of marine organisms to ship bottoms, marine structures, fishing nets, etc. is reduced. Increase the fuel efficiency of ships, etc., and extend the paint adhesion period to the bottom, underwater structures, aquaculture nets, fishing nets, buoys, industrial water systems, etc. Paint can be provided.

Although sulfur powder and red iron oxide (iron oxide) used for the antifouling paint containing the additive for antifouling paint according to the present invention have not been conventionally used as additives or antifouling paint, sulfur content and red iron oxide At the same time, it is mixed and stirred as an additive for antifouling paint and applied, in order to increase the fouling effect by (iron protection).
It has no adverse effect on marine organisms, is used as a bottom paint additive, and can be applied to underwater structures, aquaculture nets, fishing nets, buoys, industrial water systems, etc., and can exert its antifouling effect without any loss.
(1) To significantly reduce the adhesion of organisms such as oysters, algae and aosa.
(2) The coating application desorption period can be extended more than before.
(3) The durability of the paint is improved, and the repainting period from the previous application to the next application can be extended and the fuel efficiency of ships etc. can be improved.

    The ship bottom paint that is generally used at present is usually repainted work every six months to one year, but it is an antifouling paint containing the antifouling paint additive according to the present invention By using this, it is possible to extend the time until repainting. In addition, the reduction of the speed of navigation of ships and the like, the reduction of engine load, the reduction of damage to the hull, etc. are great effects.

At Iwojima Port in Kagoshima Prefecture, sulfur still continues to erupt, so the sea water in the port is yellowish brown. In addition, since iron is mixed in seawater, it is rust colored seawater. There are no seaweeds or oysters attached to marine life on harbor quay or anchored vessels. The area around the port of Iwojima is rusty and yellowish brown because of the distribution of sulfur and iron. Both of these components are considered to be due to the repelling effect of marine organisms. Sulfur and iron are effective as additives for antifouling paints that produce the same repellent effect on marine life as seawater on Iwo Jima. I think that approaching the sea water of Iwo Jima will produce the maximum antifouling effect.
However, aluminum products such as aluminum vessels have a corrosion effect that is considered to be caused by sulfur content, so the aluminum products can not but be excluded from the present invention.

Form for practicing the invention

(1) Apply ten kinds of paints to ten test boards (length = 40.0 Cm width = 10.0 Cm thickness = 5 to 8 mm) made of FRP veneer on August 9, 2016, On August 12, the test board was immersed in the sea at a fishery facility (owned by a fish cage) owned by a fisherman in Takasu Port, Kanoya City, and an immersion demonstration test for preventing adhesion of marine organisms was conducted. Reference photo 1 Reference photo 1-2
(2) The immersion demonstration test was conducted on the ship yacht (Yamaha Y-17) together with the above test plate. On July 10, 2016, the yacht hull was divided into a starboard side and a port side, and divided into four from the center of both sides to the bow side and the stern side, and paint was applied to each.
Reference photo A Reference photo B Reference photo C

Describe the results of immersion demonstration test verification of the test plate of (1). The following test boards were made.
Test plate 0 paint, no paint FRP single plate test plate 1 ship bottom paint (crown color YS # 3000 rust color) containing 5 to 10% by weight of iron oxide (iron oxide), particle size 0.3 to 0. It is a paint of 4 μm. I painted it only.
Test plate 2 The bottom paint crown collar was mixed with 9.09% by weight of sulfur and painted.
Test Plate 3 Only the hydrolyzable paint (red) was applied.
Test plate 4 11.11% by weight of sulfur was mixed with a hydrolyzable paint (red) and applied.
Test Plate 5 A mixture of 10.6% by weight sulfur and 4.25% by weight petals was coated on a hydrolyzable paint (red). 500 g of sulfur powder and 200 g of red iron oxide were mixed with 4.0 kg of a hydrolyzable paint (red) and applied.
Test Plate 6 Only the hydrolyzable paint (blue) was applied.
Test plate 7 11.11% by weight of sulfur was mixed with a hydrolyzable paint (blue) and painted.
Test plate 8 A mixture of 10.6% by weight of sulfur and 4.25% by weight of red paint in a hydrolyzable coating (blue) and coated on a test plate 9 to be hydrolyzed into a test plate (width = 15 cm long = 50 cm thick = 5 mm) The mold paint (red) was mixed with 5.0% by weight of sulfur and applied. I decided to try the minimum limit of sulfur content.
The painted portions of the above 10 test plates were taken out of the surface of 5 to 10 Cm from the sea level, and were installed so that the level below the sea level was 30 Cm, and the immersion demonstration test was performed. The test part was taken out above the sea surface in the painted part. Around the sea level, the paint often peels off due to the waves hitting it. It is speculated that direct sunlight may also cause seaweed to easily adhere.
We will verify it after 6 months and 1 year. Reference picture 1 Reference picture 1-2

FRP single plate (width = 13.5 Cm length = 54.0 Cm length demonstration test of hydrolyzable paint (blue) with sulfur and red iron oxide (iron oxide) at the same weight% 8% and 12% paint Four test plates each having a thickness of 4 to 5 mm were prepared and coated on two types of hydrolyzable paints (blue) on August 30, 2016. Although there is no scientific basis, in light of the results of the previous verifications, etc., it is considered that the ratio of sulfur content to red ink is 8% by weight and 12% by weight. We decided to speculate and test that it might be close to the composition of the ocean of Mishima-mura, Kagoshima prefecture mixed with iron and sulfur.
Test Board 08 A separate hydrolyzable paint (blue) was mixed with 8% by weight of sulfur and iron and applied.
Test Plate 12 A separate hydrolyzable paint (blue) was mixed with 12% by weight of sulfur and iron and applied.
A test plate 88 was mixed with 8 wt% of sulfur and iron in a hydrolyzable paint (blue) and painted.
A test plate 1212 was mixed with 12% by weight of sulfur and iron in a hydrolyzable paint (blue) and applied.
The demonstration test was started on September 1, 2016, by placing it in a cage with another test plate immersed and verifying the immersion condition. 6 months later 1 year later.
Reference photo 3-1 Reference photo 3-2 Reference photo 4-1 Reference photo 4-2

On September 12, 2016, I took photographs of 10 test plates after 1 month and 1 month. The first verification results are as follows.
Test board 0 A small amount of seaweed was already attached.
Test board 1 There is no adhesion of seaweed or oysters.
The test plate 2 was soiled on the entire surface but there was no adhesion of seaweed or the like.
Test plate 3 There were adhesion and stains of seaweed, and peeling of paint was observed.
Test plate 4 Contamination was observed but no seaweed adhesion.
Test board 5 Dirt was seen. Seaweed is not attached.
Test plate 6 There was dirt, but there was no adhesion of seaweed.
Test plate 7 There were stains and paint peeling off. I can not see seaweed.
Test board 8 There was contamination, but no seaweed was attached.
There was contamination of the test plate 9 (5% application test plate).
Because of the small number of days after painting, there was no change other than dirt on the test plate.
Reference photo 1 (0: 5) Reference photo 2 (1: 2) Reference photo 3 (3: 4)
Reference photo 4 (6: 7) Reference photo 5 (8 right) Reference photo 6 (5% sulfur content)

Ten test boards were landed on November 4, 2016 and verified.
It is 85 days after beginning immersion proof test.
The whole of the test plate 0 was polluted and seaweed and oysters were attached.
Test plate 1 Partially dirty. Adhesion of seaweed was also observed. There was peeling of the paint.
Test board 2 It was dirty overall. Seaweed was attached to the lower end.
The front side where the test plate is 3 days is completely soiled, and the back side is less polluted and there is no adhesion of seaweed and oysters.
The test plate 4 was polluted as a whole. Seaweed was beginning to come on.
The entire surface of the test plate 5 was dirty. Seaweed had begun to attach, but there is no adhesion of oyster.
Test plate 6 Although slightly dirty, peeling of the paint was observed, but no seaweed or oyster.
Test board 7 There are few stains, but there is no adhesion of seaweed oysters.
Test board 8 There was a slight contamination but no seaweed or oysters were found.
Test board 9 It was polluted. It had an oyster. It is considered that the cause is that the paint is peeled Reference photo 0-A Reference photo 1-A Reference photo 2-A Reference photo 3-A Reference photo 4-A
Reference Photo 5-A Reference Photo 6-A Reference Photo 7-A Reference Photo 8-A Reference Photo 9-A

After 10 test boards were flooded, they were withdrawn from the sea on February 25, 2017 on the 198th day, verified, and photographed. The verification results were as follows.
Test plate 0 Contaminated so that the surface of the test plate could not be seen, and seaweed and oysters were on the entire surface.
Test board 1 A lot of seaweed and oysters were attached.
Test board 2 There was no adhesion of oyster, but it had seaweed.
Test board 3 There was seaweed.
The test plate 4 oyster was not found, but seaweed was attached to the sea level and the lower end of the test plate.
Test plate 5 Seaweed was attached. There was no oyster.
There was no test plate 6 oyster, and seaweed was seen.
Test board 7 The seaweed was attached, but oysters were not found.
Test plate 8 Seaweed was attached.
Test board 9 The seaweed was attached but the oyster was not attached.
The verification test with the test plate is puzzled by the increase in contamination and adhesion of seaweed as compared to the verification test of the ship. Most parts of the test plate are exposed to sunlight, so it is considered that seaweed adheres frequently.
In the case of ships where the sun does not hit the bottom, there is no adhesion of seaweed or oysters in the paint whose additive is a sulfur valve. Seaweed adhesion may be seen on the sunny side of the ship and the stern. And because the ship sails, I think that the attached pollution and seaweed etc. will be stripped off with other force. In short, in places exposed to sunlight, sunlight and paint react, and seaweed and oysters are easily attached.
Reference photo 1B (0: 5) Reference photo 2B (1: 2) Reference photo 3B (3: 4)
Reference photo 4B (6: 7) Reference photo 5B (8: 5% board)

After 10 test boards were flooded, final verification was conducted with Shunichi Nakamura on September 1, 2017, on the 388th day.
Test plate 0 Not painted A large amount of seaweed and oyster were attached.
Test board 1 Bottom paint crown color only Seaweed and oysters were attached.
Test plate 2 The bottom paint crown collar was mixed with 9.09% by weight of sulfur and painted.
Seaweed and oysters were attached.
Test Plate 3 Only the hydrolyzable paint (red) was applied.
Seaweed was attached a little in verification.
Test Plate 4 Only a 11.1% by weight of sulfur was mixed and painted in a hydrolyzable paint (red).
Seaweed adheres less than test plate 3 in verification.
Test plate 5 A mixture of 10.6% by weight of sulfur and 4.25% by weight of red iron oxide was coated on a hydrolyzable paint (red). There was no adhesion of seaweed or oysters.
Test Plate 6 Only the hydrolyzable paint (blue) was applied. Seaweed was attached.
Test Board 7 A hydrolyzable paint (blue) was coated with 11.1% by weight of sulfur.
In the verification, no adhesion of seaweed or oyster was found.
Test Plate 8 A mixture of 10.6% by weight sulfur and 4.25% by weight petals was coated on a hydrolyzable paint (blue). Seaweed was attached in the verification.
Test plate 9 A sulfur content of 5.0% by weight was mixed with a hydrolysis paint (red) and applied. In the verification, a large amount of seaweed and oysters were attached to the south side (the surface exposed to the light). The northwestern side, which is considered to be not sunny, was free of seaweed and oysters. It is thought that it reacts with sunlight and the like to the components and growth of seaweed and oysters. Unlike in the case of painting on ships (ordinary paint on the bottom of the ship, condition of use), it was thought that seaweed and oysters were often attached in the immersion proof test on the test plate. The seaweed and oyster adhesions were smaller in the verification on September 1, 29 than in the verification in February 29, 1999. Seaweed may have been stripped by waves and winds, but it is not visible. Even if the navigation speed is not high, it can be inferred that seaweed etc. will be stripped away.
Reference photo 1-1 Reference photo 1-2 Reference photo 2-1 Reference photo 2-2
Reference photo 3-1 Reference photo 3-2 Reference photo 4-1 Reference photo 4-2
Reference photo 5-1 Reference photo 5-2 Reference photo 6-1 Reference photo 6-2
Reference photo 7-1 Reference photo 7-2 Reference photo 8-1 Reference photo 8-2
Reference photo 9-1 (sulfur content 5%) Reference photo 9-2 (sulfur content 5%)
Reference photo 0-1 (without painting) Reference photo 0-2 (without painting)

The table below shows the results of the immersion verification test verification.

October 6, 2015 A yacht (Yamaha Y-17) was coated with 2.50 kg of a paint prepared by mixing 11.1% by weight of sulfur with a hydrolyzable paint (red). The condition of the bottom of the ship was checked on June 28, 28 years after nine months. An oyster was attached to the draft line of the hull. The east side (port side) where the sun rises is more oysters attached than the west side (right side) where the sun sets. There is no adhesion of seaweed or oysters on the bottom of the ship that is not exposed to sunlight.
This time, we decided to develop a new paint that mixes sulfur and red iron oxide (iron). I decided to paint the paint on the port side. It painted in the following essential point on July 10. The color of the bottom paint is red. I divided the hull of the yacht into four and painted each paint. The yacht was divided into a starboard side and a port side, and both sides were divided into a bow part and a stern part from the center of the hull to make 4 sides (A side B side D side). The keel section was also divided into four.
0.9 kg of a hydrolyzable paint (red) was applied to the A side left bow (from the left bow to the center of the hull).
Only the crown collar was painted 0.66 Kg on the B side starboard bow (from the starboard bow to the center of the hull).
Surface C: The left stern and the stern were painted by mixing 10.6% by weight sulfur and 4.25% by weight with hydrolyzable paint. I applied 1.24 kg.
On the right side stern of D side, the crown collar was mixed with 9.09% by weight of sulfur and coated with 1.45 Kg.
In blending sulfur and red iron oxide, I made it close to the seawater of Mishima Mura Iwojima.
On August 1, 2016, I got on the yacht. Overcome six months and one year later and verify the adhesion of seaweed and oysters with Shunichi Nakamura.
Reference photo A Reference photo B Reference photo C

The yacht (Yamaha Y-17) was checked on February 25, 291 after 210 days of flooding.
Seaweed A was attached to the side coated with the hydrolyzable paint (red).
Surface B Right side bow Section The bottom of the bottom paint crown color was coated with seaweed.
An oyster was also seen.
Seaweed was deposited on the surface of the hydrolyzable paint (red) mixed with 10.6% by weight of sulfur and 4.25% by weight of red iron oxide on the left side of the bow. I could not find an oyster.
On the D side, the right side, the stern and the bottom part of the bottom paint crown collar mixed with 9.09% by weight of sulfur, no oysters were found, but seaweed was attached.
The surface coated with sulfur and red iron oxide has less adhesion of polluted algae and oysters than a single paint surface. It is believed that antifouling paints containing sulfur and red iron oxide in the additive are advantageous.
Reference Photo D Reference Photo E Reference Photo F Reference Photo G

The yacht (Yamaha Y-17) was landed and verified in the first year after the flood on September 1, 2017.
On the A side, the left side of the bow, with 0.95 kg of the hydrolyzable paint (red) only, seaweed was found in the water line in the verification. Other than that there were neither seaweed nor oysters. I think that the reaction with the paint etc. of the water line part is also the cause of exfoliation.
B side 0.65 kg of the crown brow crown color only (paint containing 5 to 10% of iron oxide (iron oxide)) was coated. Seaweed was attached in the verification. "I also saw oysters.
Surface C Left stern stern A mixture of 10.6% by weight of sulfur and 4.25% by weight of red iron oxide in a hydrolyzable paint (red) was coated. In the verification, seaweed and oyster adhesion were also small.
Surface D Right side aft aft Bottom paint crown color mixed with 9.09 wt% sulfur and painted. Seaweed was attached in the verification. I could not find an oyster.
Most of the areas where seaweed and oysters are attached are where paint was stripped off. The unpainted part of the paint, the part where the paint is applied, there is very little adhesion of seaweed and oysters.
To prevent peeling of the paint, use a paint method that does not paint off or peel off.
The iron keel section of the yacht was also closely examined, but the D side was the least polluted, with less seaweed and oysters. Paint that mixes sulfur with crown color has high antifouling effect. Paints of this component are most effective for steel ships and underwater structures made of iron.
Reference Photo H Reference Photo I Reference Photo J Reference Photo K Reference Photo L Reference Photo M

It was decided to make a paint in which the same weight% of sulfur and red iron oxide were mixed with the hydrolyzable paint (blue) and make a dip test. The 8% and 12% paints are demonstrated with 2 hydrolyzable paints (blue). Four test plates (FRP veneer width = 13.5 Cm length = 54.0 Cm) are made and tested.
There is no scientific basis for determining the proportions of sulfur and petal blend at 8% and 12%. In the demonstration test so far, when the sulfur content is 20.0% by weight or more, the antifouling effect is not at all, and conversely, the adhesion of seaweed and oysters is increased, so 12% was determined to be good. Since it was tested at 5% by weight of sulfur in another demonstration test that was determined to be 8%, the intermediate figure was appropriate. We think that it may be close to the sea of Mishima village Iwojima, Kagoshima prefecture where iron and sulfur are mixed, and two proportions of 8% and 12% are optimal, so we will test it. I painted it on August 27th and put it in the sea on September 1st.
Test plate 08 Another hydrolyzable paint (blue) was mixed with 8 wt% each of sulfur and red iron oxide and painted.
Test Plate 12 A separate hydrolyzable paint (blue) was coated with sulfur and a petal by mixing 12% by weight.
The test plate 88 was mixed with 8 wt% of sulfur and red iron oxide in a hydrolyzable paint (blue) and painted.
Test plate 1212 A mixture of 12 wt% of sulfur and red iron oxide in a hydrolyzable paint (blue) was coated.
We decided to set and test 4 test boards in a sacrifice frame by sinking about 30 Cm in the sea from east to west. [0017] reference photo number

Four test boards soaked in seawater on September 1, 2016 were landed on February 25, 29th, 178 days after inundation, and verified. Seaweed was attached to the portion of the test plate near the sea surface and the lowermost end (under the sea). There was no adhesion of seaweed or oysters except at the sea level and the lowest end. There is no difference between the two hydrolyzable paints (blue). The adhesion of seaweed was less with the 12% test plate than with the 8% test plate. There is less adhesion of seaweed on the sunless side than on the sunlit side.
This fact is unchanged even if we have verified more than six years. As ships move by sailing and waves, seaweed etc. may be stripped off. The stationary test plate had a large amount of seaweed adhesion. Although the number of days is about six months, it is considered to be effective for antifouling paints such as fishing boats, recreational boats and underwater structures.
Reference photo B-1 Reference photo B-2 Reference photo B-3 Reference photo B-4

September 1, 2017 We verified the four test boards.
Test plate 08 Another hydrolyzable paint (blue) was mixed with 8% by weight of sulfur and red iron oxide and painted. Seaweed was attached in the verification.
Test Plate 12 Another hydrolyzable paint (blue) was mixed with 12% by weight of sulfur and red iron oxide and painted.
In the verification, more seaweeds and oysters were attached than the test plate 08. There was less adhesion at 8% than at 12%. In the test plate 08 and the test plate 12 as well, the adhesion of seaweed and oysters was small on the north side (the surface assumed to be less sunny).
The test plate 88 was mixed with 8 wt% of sulfur and red iron oxide in a hydrolyzable paint (blue) and painted. Seaweed and oysters were attached a little by inspection.
Test plate 1212 A mixture of 12 wt% of sulfur and red iron oxide in a hydrolyzable paint (blue) was coated.
In the verification, more oysters and seaweed were attached than the test plate 88. Test Plate 88 The adhesion of seaweed and oysters on the north side of the test plate 12 was small. The south side, which seems to be sunny, had many seaweeds and oysters attached.
Reference photo 08: 12 Reference photo 08: 12 Reference photo 88: 1212 Reference photo 88: 1212

  The present invention relates to adhesion of marine organisms, seaweed and various antifouling ship bottom coatings to ship bottoms, underwater structures, aquaculture nets, fishing nets, floats, industrial water systems, etc. made of various materials such as steel vessels (iron vessels) FRP vessels. The use of is expected.

Claims (1)

At the same time, 4 to 12% by weight of ferric oxide (iron oxide Fe2O3) with a particle size of 0.3 to 0.4 μm, which has a repellent effect on marine organisms, and 5 to 10% by weight of sulfur, which has a repellent effect on marine species An antifouling paint for repelling marine organisms, which is incorporated as an antifouling paint additive and has more effective antifouling effect.