JP2008075060A - Paint for preventing shellfish from sticking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paint which allows saving a great deal of labor to remove sticking shellfishes, is harmless to a human body, does not destroy an oceanic ecosystem, and can be applied to the outer wall of a ship and the inner wall of a seawater transferring pipe. <P>SOLUTION: The paint for preventing shellfish from sticking comprises capsicine at a weight ratio of 1/100,000 or higher based on the total of solid components, or a capsicine-containing powder from vegetable materials containing capsicine at a weight ratio of 1/100,000 or higher based on the total solid components. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a coating material that mainly prevents shellfish such as barnacles from adhering to the outer wall of a ship or the inner wall of a cooling seawater transport pipe of a power plant.

In many cases, shellfish such as barnacles adhere to the outer wall under the surface of the water in a ship, and there are harmful effects such as an increase in water resistance. In order to reduce this burden, there is a demand for paint for ship exterior walls that prevents shellfish from adhering or becoming settled.However, highly toxic materials are feared to be harmful to humans due to marine pollution and marine product pollution. All of these paints have only a function of preventing the adhesion of shellfish to a very insufficient extent.

Under such circumstances, there is a strong demand for the realization of paints for ship outer walls that can significantly reduce the removal work of attached shellfish and that are harmless to human bodies and do not destroy marine ecosystems. The present invention seeks to solve this problem.

In order to solve the above-mentioned problems, the present inventor has unexpectedly tried to prevent the adhesion of shellfish by mixing various kinds of ingredients such as spices, which are virtually harmless to the human body and the ecosystem, in particular, with paints. In addition, it was found that the powder of chili peppers has a remarkable effect even though the amount is very small, and the causative substance was also found to be capsaicin (also called capsanthin), and the present invention was achieved.

That is, capsaicin is used as a coating material, and is contained in a weight ratio of 1 / 100,000 or more in the total solid component weight ratio, thereby forming a shellfish adhesion preventing coating.

At this time, capsaicin as a pure chemical substance may be used, but it is also possible to use powdered pepper seeds containing abundantly this. By the way, there is a considerable difference in content depending on the type of chili pepper, about 0.2% for domestic Kamizumo chili, 0.01-0.75% for Korea or China, 2% for Mexican habanero It is supposed to be included before and after. In addition, even if it is the same kind, peppers, paprika, etc. do not have pungency and do not contain capsaicin, so they are not used in the present invention. When the plant material powder containing the capsaicin is used, the mixing amount may be contained so that the capsaicin contained therein becomes 1/10000 or more in the total paint solid component weight ratio. Therefore, when using a habanero with a content of 2%, it may be 1/10 of 0.2%, but it still requires 1/2000 or more of the total solid component of the paint.

If the content of capsaicin is less than the above-mentioned value, although there is a slight repellent effect on shellfish, it is practically insufficient to achieve the purpose of preventing adhesion. Moreover, it is not necessary to provide an upper limit as long as the physical properties as a paint are not impaired, but about 1/1000 to 1/2000 (0.1% to 0.05%) is preferable in consideration of economy. If this is converted to a pepper powder containing 0.3% capsaicin, about 20% is mixed, and if converted to a habanero powder containing 2%, about 3% or more is a standard.

Also, when using plant material powder, use a material with a high content such as habanero to avoid mixing in as much extraneous matter as possible, and make the powder finish as fine as possible so that the paint finish is not rough. It is preferable to do. Furthermore, when mixing in a non-aqueous paint, it is a matter of course that the powder should be made into an absolutely dry body.

In the case of a lacquer type, for example, the coating material to be applied is reduced after drying by evaporation of the solvent. Therefore, the amount of capsaicin mixed is measured taking this into consideration in advance. It should be noted that in virtually all ship exterior wall paints that are commonly used, it is recognized that the coating can permeate capsaicin in small amounts and release outwards, resulting in the addition of, for example, about 10% habanero fine powder. As a result, it has been found that the number of barnacles attached can be reduced to several tenths as compared with a conventional marine paint (a shell-proof paint).

According to the present invention, by using it as a coating applied to the outer wall corresponding to the underwater surface of a ship or the inner wall of a cooling seawater transport pipe of a power plant, it is possible to significantly prevent the attachment or establishment of shellfish such as barnacles. Therefore, the removal work can be remarkably reduced, and at the same time, the durability of the wall surface is improved and the effect of preventing environmental pollution and the like is obtained.

About 0.1% of capsaicin in terms of capsaicin is mixed with habanero finely pulverized to an average particle diameter of about 10 μm or capsaicin extracted from the conventional paint for ship outer walls. However, the optimum particle size and mixing percentage are not limited to this, and are appropriately selected in consideration of the type of coating film required, durability, economy, and the like.

Experimental example

Three FRP plates of about 200 square centimeters are prepared, one of which is about 30 μ thick of conventional marine anti-shell paint (trade name Lightlet: manufactured by China Paint Co., Ltd., containing 20-30% xylene) The other sheet is coated with the same paint mixed with 30 W% of Chinese heavenly chili powder, and the other sheet is mixed with 15 W% of Mexican habanero powder. A thick sample was applied as a sample. These were soaked into the sea of Mikawa Bay under the same environmental conditions at the same time, and after 3 months, the number of barnacles adhering to the surface was counted. The result was three on the surface and only one on the Habanero mixing surface (and one on the edge of the plate). Incidentally, more than 200 barnacles were attached to the unpainted back surface.

The paint of the present invention can be obtained only by mixing a small amount of capsaicin or a plant powder containing the same with a conventional one, and there is no practical secondary adverse effect. Therefore, it can be said that there is sufficient industrial applicability.

Claims (2)

A shellfish adhesion-preventing paint comprising capsaicin as a paint raw material in an amount of 1/100000 or more in the total solid component weight ratio. A shell material adhesion-preventing paint characterized in that a plant material powder containing capsaicin as a paint raw material is contained so that capsaicin contained therein becomes 1/10000 or more in the total weight ratio of solid components of the paint.