Repair composition for seaweed cultivation supports

Abstract

To provide a repair composition for repairing an exposed portion formed by cutting of a surface coating of a laver-culturing column.SOLUTION: A column-repairing composition for repairing a laver-culturing column contains epoxy resin, titanium oxide, alumina, and acryl emulsion. The column-repairing composition is applied to an exposed portion of the column and dried.EFFECT: After drying, the composition has higher mechanical strength and smaller surface friction than those of urethane resin, so that the composition has excellent durability and is resistant to barnacles, stains and the like.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a repair composition for seaweed cultivation supports. [Background technology]

[0002] One of the methods of cultivating seaweed is called pole culture. In pole farming, poles are thrust into the sea and held upright, from which nets (nori nets) with nori spores attached are hung. This way, when the tide is high, the nets are submerged in the sea, allowing the nori to absorb the nutrients in the seawater. On the other hand, when the tide is low, the nets emerge from the water, exposing the nori to sunlight and allowing it to dry. By repeating this process, the nori grows, and when it has grown sufficiently, a boat equipped with a machine called a plucker to pick the nori is sent under the nori nets, and the nori is harvested.

[0003] In seaweed farming, the tidal range can sometimes be as much as six meters. Therefore, the poles must be long enough to accommodate this tidal range, and are about eight to fifteen meters long. In addition, a large number of poles are needed for farming, with each fisherman having hundreds to a thousand poles. When farming is finished, the poles are pulled out and stored for use the following year.

[0004] Traditionally, bamboo was used for the posts, but in recent years, chemically manufactured posts (hereinafter simply referred to as "posts") have been used (for example, Non-Patent Document 1). In other words, posts are required to have bamboo-like properties, such as flexibility, strength, and lightness. For this reason, posts are made with a hollow FRP core, the surface of which is coated with urethane resin. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] FRP poles for seaweed cultivation, introduction page (URL: https: / / www.donglong.jp / frp.html) DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] When the cultivation is completed and the poles are removed, certain treatment may be required. In other words, barnacles and dirt often adhere to the posts, and these need to be removed. However, barnacles and other pests are strongly attached to the posts and are not easily removed. In addition, since it is necessary to pull out several hundred posts per day and the work must be done in a limited working space on board a ship, it is necessary to remove the barnacles and other pests efficiently and quickly. For these reasons, in order to remove the barnacles and other pests, it is common to use a special mechanical roller to scrape off the surface coating of the posts and remove them.

[0007] When barnacles and other contaminants are removed by scraping with a mechanical roller, the urethane resin coating on the surface of the support will peel off, exposing the FRP inside (for example, Figure 3e. Below, such exposed areas will be referred to as "exposed parts"). If the pillars were to be used again in this state, corrosion would progress from the exposed parts, which could impede their use as pillars and pose problems in terms of durability. For this reason, the exposed parts were previously repaired by applying the same urethane resin as the surface material.

[0008] However, the inventor believed that there was room for improvement in such repairs. In other words, exposed parts are locations where barnacles and the like tend to attach in the first place, and when repairing with urethane resin, barnacles will also attach and it will become necessary to remove them again. Therefore, the inventor thought that it would be preferable to use a repair agent that makes it difficult for barnacles and the like to attach when repairing exposed parts.

[0009] In light of the above circumstances, the present invention aims to develop a repair composition for repairing exposed parts of supports. [Means for solving the problem]

[0010] After extensive research, the inventor came up with the idea of ​​using paint that has a certain degree of mechanical strength and low surface friction as a repair agent to make it difficult for barnacles and dirt to adhere, and thus completed the invention. The present invention comprises the following configuration. [1] A composition for repairing seaweed cultivation supports, comprising an epoxy resin, titanium oxide, alumina, and an acrylic emulsion. [2] A composition for repairing the seaweed cultivation support described in [1], further comprising glass powder. [3] A composition for repairing a seaweed cultivation support as described in [1] or [2], further comprising fibers. [4] A composition for repairing a seaweed cultivation support as described in any one of [1] to [3], further comprising a pigment colorant. [5] A composition for repairing seaweed cultivation supports as described in [4], wherein the pigment colorant is iron oxide. [6] A composition for repairing a seaweed cultivation support described in any one of [1] to [5], further comprising an aromatic compound. [7] A composition for repairing supports for seaweed cultivation according to [6], wherein the aromatic compounds are 2-[4-([ 2-Hydroxy-3-dodecyloxypropyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-([ 2-Hydroxy-3-tridecyloxypropyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine.

[0011] [8] A first composition is made of an epoxy resin, titanium oxide, and alumina, A composition for repairing supports for seaweed cultivation, which is used by adding and stirring an acrylic emulsion to the first composition immediately before use. [9] A composition for repairing seaweed cultivation supports as described in [6], further comprising glass powder in the first composition.

[10] A composition for repairing a seaweed cultivation support as described in [6] or [7], further comprising a fiber in the first composition.

[11] A composition for repairing a seaweed cultivation support as described in any one of [6] to [8], further comprising a pigment colorant in the first composition.

[12] A composition for repairing seaweed cultivation supports as described in [9], wherein the pigment colorant is iron oxide.

[13] A method for repairing supports for seaweed cultivation, comprising repairing portions of supports for seaweed cultivation where a coating has peeled off by applying a composition described in any one of [1] to

[10] and drying the composition. Effect of the Invention

[0012] The present invention makes it possible to provide a repair composition for repairing exposed portions of a support. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing materials constituting a composition. [Diagram 2] FIG. 1 is a diagram showing the first composition and the state of mixing it with an acrylic emulsion. [Diagram 3] A diagram showing the process of applying the composition of the present invention to exposed parts of seaweed cultivation supports and repairing them. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The composition for repairing seaweed cultivation supports of the present invention (hereinafter, abbreviated as "support repair composition") is characterized by being composed of epoxy resin, titanium oxide, alumina, and acrylic emulsion. This composition can be used by making the epoxy resin, titanium oxide, and alumina into a first composition, and adding and stirring the acrylic emulsion to this first composition immediately before use. The post repair composition is applied to the exposed portion of the post and dried before use. After drying, it has higher mechanical strength and less surface friction than urethane resin, resulting in excellent durability and the effect of making it difficult for barnacles and dirt to adhere to it.

[0015] The composition for repairing a post of the present invention preferably contains either glass powder or white silica, or both of them, which has the effect of improving the mechanical strength of the composition for repairing a post of the present invention. There is no need to limit the glass powder in particular, and commonly used powdered glass may be used. Furthermore, the white silica is not particularly limited, and commonly used powdered white silica may be used.

[0016] It is preferable that the composition for repairing a post of the present invention contains fibers. This makes it possible to further improve the viscosity of the composition for repairing a post of the present invention, which has the effect of making it easier to fit to exposed parts and improving the adhesive effect. In addition, it has the effect of improving the mechanical strength. The fibers are not particularly limited as long as they contribute to improving viscosity, and various fibers can be used. As the fibers, chemically synthesized fibers can be preferably used, and vinylon fibers can typically be used. Furthermore, the fiber diameter of the fibers used can typically be 3 μm or more, preferably 3 to 12 μm, more preferably 3 to 10 μm, and most preferably 3 to 8 μm. Furthermore, the fiber length of the fibers used can typically be 0.5 mm or more, preferably 0.5 to 4 mm, more preferably 0.5 to 3 mm, and most preferably 0.5 to 2 mm.

[0017] The pole repair composition of the present invention preferably contains a pigment colorant, which enables repairs to be made according to the external appearance of the pole, and has the effect of improving the aesthetic appearance. There is no particular need to limit the pigment, and various pigments can be used according to the color of the support. As such a pigment, iron oxide, which has a green color, can be used.

[0018] The pole repair composition of the present invention preferably contains an ultraviolet absorbing compound, which has the effect of making it possible to prevent surface deterioration of the repaired area due to ultraviolet rays. There is no particular limitation on the ultraviolet absorbing compound, so long as it has ultraviolet absorbing properties and is a compound that is uniformly mixed as a composition component, and various compounds can be used. As such a compound, typically, an organic aromatic compound may be used, and as such a compound, it is preferable to use a benzotriazole-based compound, and it is most preferable to use 2-[4-([ 2-Hydroxy-3-dodecyloxypropyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-([ 2-Hydroxy-3-tridecyloxypropyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (Chemical Formula 1). [ka]

[0019] The present invention can be configured as a method for repairing supports for seaweed cultivation, characterized in that the above-mentioned composition is applied to exposed portions of the supports from which a coating has peeled off, followed by drying to repair the exposed portions. After the first composition and the acrylic emulsion are added, various additives can be added (additive addition step). Examples of such additives include organic solvents (such as thinners; fluidity adjustment step) that adjust the fluidity of the composition, and hardeners that promote hardening after drying (hardening promotion step).

[0020] In the present invention, a seaweed cultivation support pole may be configured by applying a composition for repairing the seaweed cultivation support pole to the surface of the FRP. This makes it possible to use the pole as a seaweed cultivation support pole that is resistant to the adhesion of barnacles and dirt. EXAMPLES

[0021] The composition for repairing supports for seaweed cultivation of the present invention will be described in detail.

[0022] 1. Figure 1 shows the appearance of each composition or constituent material. (1) a is a deep green liquid and is a first composition made by mixing titanium oxide, alumina, glass powder, white silica, vinylon fiber, and pigment (iron oxide). (2) b is an acrylic emulsion. (3) c is a colorless, transparent liquid and a thinner. (4) d is, from the left, white silica, titanium oxide, alumina, glass powder, vinylon fiber (diameter 6 μm × length 1 mm), and pigment (iron oxide). By mixing and stirring these, the first composition can be prepared.

[0023] 2. Figure 2 shows how the composition is prepared for use. (1) e shows the first composition being dispensed into a paper cup. (2) f shows the state in which acrylic emulsion is being added to a paper cup. It can be seen that the acrylic emulsion is being added to the upper right part of the paper cup. 15 g of acrylic emulsion is added to 50 g of the first composition. (3) g shows the state of mixing and stirring the first composition and acrylic emulsion. (4) h shows the addition of thinner, which makes it possible to reduce the viscosity of the liquid and increase its fluidity. (5) i shows the addition of an amine-based hardener, which makes it possible to shorten the time it takes for the composition to dry and harden after application.

[0024] 3. Figure 3 shows the composition being applied. (1) j is a diagram of the exposed part of a support pole for seaweed cultivation. It can be seen that the urethane resin on the surface of the pole has been scraped off, exposing the FRP part (white) inside. (2) k shows the composition being applied to the exposed area using a chopstick. (3) l shows the spreading of the applied composition. (4) m shows the appearance of the support after application.

[0025] 4. In addition, a UV absorber (trade name: Tinubin 400, Tinubin is a registered trademark) containing 2-[4-([ 2-Hydroxy-3-dodecyloxypropyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-([ 2-Hydroxy-3-tridecyloxypropyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine was added at 1% by weight to the first composition (not shown). This makes it possible to prevent deterioration of the repaired area due to ultraviolet rays.

Claims

1. A composition for repairing supports for seaweed cultivation, comprising epoxy resin, titanium oxide, alumina, acrylic emulsion, glass powder, white silica, and fiber.

2. The composition for repairing seaweed cultivation supports according to claim 1, further comprising a pigment dye.

3. The composition for repairing seaweed cultivation supports according to claim 2, wherein the pigment colorant is iron oxide.

4. A composition for repairing a seaweed cultivation support according to any one of claims 1 to 3, further comprising an aromatic compound.

5. The composition for repairing a seaweed culture pole according to claim 4, wherein the aromatic compounds are 2-[4-([2-hydroxy-3-dodecyloxypropyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-([2-hydroxy-3-tridecyloxypropyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine.

6. In the case of seaweed cultivation supports, the part where the coating has peeled off is 6. A method for repairing supports for seaweed cultivation, comprising applying a composition according to any one of claims 1 to 5 and drying the applied composition.

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