JPH03111460A - Spray coating material and concrete structure - Google Patents

Abstract

PURPOSE:To obtain a spray coating material which promote the adhesion of a periphyton to the surface of a concrete structure by compounding an acrylic resin with volcanic ashes, oyster shells, KOKA-SEKI, coffee husks, photosynthetic bacteria, chitin or chitosan. CONSTITUTION:A spray coating material which comprises an acrylic resin as a base and at least one member selected from among Shirasu balloon (volcanic ashes), oyster shells, KOKA-SEKI, coffee husks, photosynthetic bacteria, chitin, and chitosan. A pref. acrylic resin is a compsn. wherein a water-soluble copolymer prepd. by copolymerizing acrylic acid with acrylamide or an emulsion-type one consisting of acrylates and methacrylates is the base and various additives are properly added thereto. In this spray coating, the acrylic resin has alkali resistance, so that it is possible to prevent an alkaline substance from exuding from concrete by coating a concrete structure therewith.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention is applicable to spraying onto the surface of concrete structures such as fish reefs, wave-dissipating blocks, tetrapods, and river revetment blocks used in the sea, lakes, and rivers. The spraying that promotes the attachment of sessile organisms relates to paint, and this spraying relates to concrete structures made of sprayed paint.

"Conventional Technology" In recent years, marine resources such as seafood have been decreasing in Japan's coastal waters and rivers. For this reason, there is an urgent need to increase the number of organisms that serve as food for fish and shellfish, and various coastal fisheries are being developed to achieve this goal. As part of such efforts to develop coastal fisheries, various types of concrete fish reefs are being sunk in coastal waters, and organisms that serve as food for fish and shellfish are created and raised on these reefs.

``Problems to be Solved by the Invention'' However, since these fish reefs are made of concrete, their surfaces are smooth and difficult to finish into rough surfaces. Therefore, it is difficult for sessile organisms such as plankton and seaweed to settle on such fish reefs, and it takes a long time for organisms to attach to them after they are deposited. In addition, since microorganisms dislike alkaline substances, it becomes difficult for them to adhere to fish reefs that are made of concrete and are therefore alkaline, and this also becomes a cause of preventing the settlement of sessile organisms as described above.

The present invention has been made in view of the above circumstances, and is intended to increase the number of organisms that can be used as food for fish classification. The purpose of the spraying is to provide a paint that promotes the growth of attached organisms on the surface of the concrete, as well as to provide a concrete structure to which this paint has been sprayed.

"Means for Solving the Problems" The present invention includes at least one of whitebait balloons (volcanic ash), oyster shells, anti-flinder stones, coffee shells, photosynthetic bacteria, chitin, and chitosan, and an acrylic resin. The above-mentioned problem has been solved by providing a concrete structure with a paint sprayed on the surface of which the paint is sprayed.

Hereinafter, the spraying paint according to claim 1 of the present invention will be explained in detail.

This spray paint is based on acrylic resin, to which is added at least one of whitebait balloons, oyster shells, anti-flinder stones, coffee grounds, photosynthetic bacteria, chitin, and chitosan.

This spraying is based on acrylic resins used in paints, such as those made water-soluble by copolymerizing acrylic acid and acrylamide, and emulsion-type resins made of copolymers of acrylic esters and methacrylic esters. It is preferable to use various additives as appropriate.

Shirasu balloons mixed with acrylic resin (
Volcanic ash), oyster shells, anti-flinder stones, and coffee grounds are all used to form irregularities on the surface of the object to be coated, and their mesh size is preferably about 100 to 200 meshes.

Photosynthetic bacteria generally contain about 58% by weight of crude protein, about 8% by weight of crude fat, and about 21% by weight of soluble sugars.

It contains approximately 3% by weight of crude fiber, and has carbon assimilation, nitrogen fixation, and purification effects such as removing 12S from water, and its cell walls are motile. It has hair.

These photosynthetic bacteria are mixed with acrylic resin and formed into paint, and when applied to the object to be coated, they promote the attachment of sessile organisms, so of course they cannot be mixed alone with acrylic resin However, it is preferable to add it together with the above-mentioned whitebait balloon, etc., as this will further promote the settlement of attached organisms.

Chitin is extracted from crab or shrimp shells and is a type of mucopolysaccharide. Furthermore, chitosan is a product obtained by deacetylating chitin. These absorb nutrients from seawater, immobilize photosynthetic bacteria, and encourage the attachment of phytoplankton and phytoplankton species. Therefore, although these chitin and chitosan may of course be mixed alone with the acrylic resin, it is preferable to add them to the photosynthetic bacteria and more preferably to use them together with the photosynthetic bacteria in addition to the whitebait balloon or the like.

In addition to these, it is preferable to add, for example, polyacrylonidonyl carbon fibers as a reinforcing material, since this will increase the adhesion between the resulting paint and the object to be coated, as well as increase the strength of the coated layer.

Such spraying paints are used by spraying on fish reefs built in the sea, rivers, and lakes, as well as wave-dissipating blocks, tetrapods, blocks for seawalls, and the like.

Since the acrylic resin in the paint has alkali resistance, for example, by applying this to a concrete structure, it is possible to prevent the elution of alkaline substances from the concrete. In this case, products containing whitebait balloons can make the applied surface uneven, and products containing photosynthetic bacteria, chitin, and chitosan can encourage attachment of attached organisms. can.

Next, an example of the use of such spraying paint will be explained based on a concrete structure according to claim 2.

FIG. 1 shows an example of a concrete structure according to claim 2, and the reference numeral 1 in FIG. 1 indicates a concrete block. The surface of this concrete block 1 is coated with the above-described spray paint, thereby forming a coating layer 2. The paint used here is made by adding materials such as shirasu balloons that give unevenness to the surface of the coating layer, photosynthetic bacteria, chitin, and chitosan to acrylic resin, and this makes the surface of the coating layer 2 is formed with unevenness.

In order to form a concrete block 1 provided with such a coating layer 2, the above paint is sprayed onto the surface of the concrete block 1 so as to cover it. For spraying, it is preferable to spray together with air because it can make the coated surface porous, and for example, a painting method is preferably employed for spraying using a stucco gun. In addition, when spraying, it is preferable to form unevenness so that the surface area becomes large, and furthermore, it is preferable that the unevenness also has enough contact with water to make it easier for sessile organisms to attach. . Further, it is desirable that the contact angle between the unevenness and water be low. Further, in such spraying, the thickness of the coating layer 2 obtained by painting is preferably about 1 to G+ym. That is, if the thickness is less than U, alkaline substances may be leached from the concrete block, and if the thickness exceeds 6, no increase in the effect can be expected.

In the concrete block 1 provided with such a coating layer 2, for example, when it is submerged in the sea to form a fish reef, the surface of the coating layer 2 is uneven, and photosynthetic bacteria, chitin, and chitosan are present. This makes it easier for phytoplankton, zooplankton, and even various algae to grow on the surface.

In the example shown in Figure 1, the paint was sprayed using acrylic resin, materials such as shirasu balloons, photosynthetic bacteria, chitin, and chitosan, but of course only one of these was added. Paint may also be used.

In addition, in this example, concrete blocks are coated with paint, but the concrete structure of claim 2 of the present invention is not limited to this, and includes wave-dissipating blocks, tetrapods, and seawall blocks. It is applicable to all concrete structures used in the sea, rivers, etc.

"Example" As an acrylic resin, water-soluble (product name: BOND).

Prepare 500g of Konishi Co., Ltd.) and add 3 ingredients: whitebait balloon (volcanic ash), oyster shell, anti-flinder stone, and coffee shell.
400 g of each of mm mesh size was added, and +00 g of water was added and stirred to uniformly disperse it, and sprayed as paint A. Also, in this spraying, paint A contains 3 g of chitin and 5 g of chitosan.

Paint B was sprayed with 10 g of photosynthetic bacteria added.

The spraying paint A and the spraying paint B were sprayed onto a concrete board using a stucco gun with a nozzle diameter of 5 mm, coating the concrete board to a thickness of approximately 6 mm, and finishing the surface with a beaded pattern to prepare an immersion test board. did. In addition, for spraying, the immersion test plate A was sprayed with paint A, and paint B was sprayed.
The plate to which this was sprayed was designated as immersion test plate B. Further, each spraying was carried out twice.

The immersion test plate A1 and the immersion test plate B thus obtained were hung together with a string and immersed in the sea together with a concrete plate to which nothing was applied for comparison. The location where the immersion was performed was on the coast, and the water was fixed at a depth of 1 m.

After being immersed in the sea for 11 days, they were pulled out of the sea and observed. Both immersion test plate A and immersion test plate B had silica algae attached to them, and immersion test plate B
A larger amount of silica algae was attached to the immersion test plate than on the immersion test plate.

On the other hand, no adherent organisms were observed on the uncoated concrete plate.

"Effects of the Invention" As explained above, the spray paint according to claim 1 of the present invention contains at least one of the following: whitebait balloons (volcanic ash), oyster shells, anti-flinder stones, coffee shells, photosynthetic bacteria, chitin, and chitosan. For example, when this paint is applied to a concrete structure, since the acrylic resin has alkali resistance, it is possible to prevent the elution of alkaline substances from the concrete. can. In addition, those containing whitebait balloons can make the coated surface uneven, and those containing photosynthetic bacteria, chitin, and chitosan can encourage attachment of attached organisms. Furthermore, in this type of spraying, if the paint is sprayed with air,
Spraying can make the base porous. Also,
When spraying, by making the surface of the substrate rough, the surface area becomes larger, making it easier for organisms to adhere to it, and it is also possible to increase the size of the substrate to which organisms can attach.

Further, in the concrete structure according to claim 2, since the above-mentioned spraying is performed by spraying the paint onto the surface of the concrete structure, it covers the alkaline and smooth surface of the concrete, which is disliked by microorganisms. This makes it easier for sessile organisms to settle on the surface. Therefore, if such concrete structures are used in the sea, lakes, or rivers, many organisms such as seaweed and plankton will adhere to their surfaces, thereby increasing the number of bottom organisms in the food chain. In addition, it can be expected to be effective as a feeding ground for young fish, and as the number of small fish increases, the viewing angle will also increase.
It has the effect of a breeding reef and is useful for the development of coastal fisheries.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an example of a concrete structure according to claim 2 of the present invention. l... Concrete block, 2... Coating layer.

Claims (2)

[Claims] (1) A spray paint characterized by comprising at least one of whitebait balloons (volcanic ash), oyster shells, anti-flinder stones, coffee grounds, photosynthetic bacteria, chitin, and chitosan, and an acrylic resin. (2) A concrete structure, the surface of which is sprayed with the spray paint according to claim 1.