JPH0253879A - Antisticking material for aquatic organism - Google Patents

Abstract

PURPOSE:To obtain the subject material, containing fine powder prepared by drying intimately bonded particles of zinc oxide, titanium oxide and water in a coating and capable of preventing aquatic organisms, such as barnacle or hard-shelled mussel, from sticking to ship bottoms, harbor facilities, crawls, etc. CONSTITUTION:The objective material obtained by precipitating a mixed aqueous solution containing a water-soluble titanium compound and bonded particulate compound of water-soluble zinc oxide, titanium dioxide and water while keeping pH at 6-11, drying and pulverizing the resultant precipitates and containing the obtained fine powder in a coating.

Description

DETAILED DESCRIPTION OF THE INVENTION (Objective of the Invention) <Industrial Application Field> The present invention relates to a material that prevents aquatic organisms such as barnacles and mussels from adhering to ship bottoms, port facilities, fish preserves, etc.

<Background of the Invention> Ships, various port facilities, fishing facilities such as fishing nets and fish pens, etc., which are exposed to seawater, are inhabited by barnacles, mussels, etc., which deteriorate the functionality and durability of these facilities. causing deterioration.

For this reason, paints have been developed that can be applied to the bottom of ships to prevent these aquatic organisms from adhering to them. However, the effectiveness of these paints in controlling aquatic organisms is not always satisfactory, and in addition, many of these paints contain tin compounds, which may elute and diffuse into the surrounding oceans. Contamination of marine life is also being pointed out.

Technical Matters Attempted to Develop> Against this background, the present inventor attempted to develop a substance that is so-called non-polluting and has a sufficiently excellent effect of preventing adhesion of aquatic organisms.

In other words, as a result of first attempting to investigate the principle of preventing this kind of aquatic organisms from adhering, we found that the possible countermeasures are to use the antibacterial properties of substances that aquatic organisms do not try to approach, or to use electrochemical methods using inorganic compounds. Based on the knowledge that there may be a clue to solving these problems, we have developed specific methods to obtain a repellent effect by utilizing their properties, and to make it difficult to adhere to by improving the properties of the surface to which it is intended to adhere. This is an attempt to develop. As a result, zinc oxide (ZnO), which as a metal has a bactericidal effect on aquatic organisms, etc.
, focused on closely bonded particles of titanium dioxide (Ti02) and water (H20), and attempted to develop a material that prevents the adhesion of aquatic organisms using these particles as a substantial protective component.

(Structure of the invention) Means for achieving the object> That is, the material for preventing adhesion of aquatic organisms according to the present invention comprises zinc oxide (
ZnO), titanium dioxide (Ti0z) and water (H2
This is characterized in that a fine powder obtained by drying the tightly bonded particles of 0) is contained in the paint, thereby achieving the above object.

To explain the fine powder obtained by drying tightly bonded particles of zinc oxide (ZnO), titanium dioxide (Ti0z) and water (H20) used in the present invention, this powder is
When the molar ratio of O and TiO2 is in the range of 1:9 to 9:1, it has good adsorption properties and can be used as a deodorizer for various malodorous gases such as hydrogen sulfide, ammonia, mercaptans, amines and aldehydes. The use of is being developed.

Zinc oxide (ZnO), a component of this material, has amphoteric properties and is white at room temperature, but turns yellow when heated. Titanium dioxide (Ti0z) is amphoteric, but more acidic than basic, and can be melted with metal carbonates and hydroxides to form anhydrous titanates. Titanium dioxide (Ti02) is also used as a white pigment in the paint industry, and zinc oxide (ZnO) is used in paints and pigments. Further, the fine powder obtained by drying the tightly bonded particles of zinc oxide (ZnO), titanium dioxide (TiO2) and water (H2O) is a water-soluble titanium compound, and water-soluble zinc oxide (ZnO), titanium dioxide (TiOz) and water ( A mixed aqueous solution containing the bound particle compound of 820),
iM is produced by forming a precipitate while maintaining a PII value in the range of 6-11, and dry-milling the precipitate.

Incidentally, in order to facilitate pulverization, a silicone-based dispersant may be appropriately mixed in during the drying process. Incidentally, regarding the above-mentioned manufacturing method, the technique disclosed in Japanese Patent Application Laid-Open No. 63-54935 can be used as an example. The fine powder obtained by drying the tightly bonded particles of zinc oxide (Zn0), titanium dioxide (TiO2) and water (H2O) thus obtained is dispersed in a paint to form the aquatic organism adhesion prevention material of the present invention. use. As a paint for dispersing this fine powder, a paint that has been commonly used in the past is used. For example, a drying oil, natural resin, synthetic resin, cellulose derivative, etc. may be used as the binder, and an organic solvent such as toluene, xylene, or thinner may be used as the solvent component. Of course, it may be a paint that does not contain a solvent, or it may contain auxiliary additives such as a pigment, a dispersant, a thickener, and an antifoaming agent.

For 90 parts of such a paint, preferably about 10 parts, preferably about 10 parts, of a fine powder made by drying tightly bonded particles of zinc oxide (ZnO), titanium dioxide (TiO2), and water (+(20) The composition is prepared by a conventionally known method in a proportion of from 10 parts to several 10 parts, preferably in a dispersed state, with a fine powder formed by drying tightly bonded particles of zinc oxide (ZnO), titanium dioxide (TiOz), and water (H2O) as a component. A paint containing such zinc oxide (Zn0
), titanium dioxide (TiO2), and water (tlzo) in which fine powder is dispersed.
It can also be used by impregnating the object. In addition, as another example, zinc oxide (znO), titanium dioxide (T
A plate-like or sheet-like object may be coated with a paint in which fine powder made by drying tightly bonded particles of i0z) and water (H20) is dispersed and then attached to the object.

Furthermore, zinc oxide (ZnO), titanium dioxide (TiOz
) and water (H20) and water (H20) in which a fine powder is dispersed therein, the fibers may be impregnated with a coating material, and the fibers may be used to make fishing nets and the like. The key is zinc oxide (ZnO)
, a fine powder formed by drying closely bonded particles of titanium dioxide (TiO2) and water (H20) is used as part of the paint component so that it is formed on the surface of the object to be protected.

<Operation of the invention> Although it is not necessarily clear in principle, when the above-mentioned aquatic organism prevention material is applied, as will be described in the effect section below, aquatic organisms tend to avoid the applied area and adhere to it. It has been confirmed that the metal has a bactericidal effect, or some substances in the seawater are adsorbed by the adsorption effect of the metal, causing changes in the surrounding environment, resulting in a repellent effect. It is presumed that

<Example> TZ-10O8 manufactured by Titan Kogyo Co., Ltd. was used as a fine powder obtained by drying tightly bonded particles of zinc oxide (ZnO), titanium dioxide (Ti0z), and water (H20).

The paint uses Acridic A-198-X, an acrylic resin manufactured by Dainippon Ink and Chemicals Co., Ltd., as a binder.
B was used.

Since this product contains xylene as a solvent, there is no need to add further solvent later. Acrizo ink A-19
To 890 parts of 8-X, 10 parts of a fine powder made by drying tightly bonded particles of zinc oxide (ZnO), titanium dioxide (Ti(h), and water (H2O)) were mixed, and then the zinc oxide (stirred) A paint was prepared in which a fine powder formed by drying tightly bound particles of (ZnO) titanium dioxide (Ti(h)) and water ([20)] was dispersed.

(Effects of the Invention) The present invention has the configuration described above, and the following effects were confirmed.

First, I will explain the testing method for confirming the effectiveness.
As shown in the drawing, this test method involves applying the aquatic organism adhesion prevention material M of the present invention in a circular shape with a diameter of 5 cm on acrylic systems P, R, and P of appropriate dimensions and a substrate 1, and placing a shellfish approximately in the center of the coating. A purple mussel with a length of 3 cm is fixed horizontally, and a test is carried out to determine where the byssus thread a from the mussel attaches (plants). Murasaki mussel is a typical aquatic creature used in adhesion tests along with Fujibbo, and it represents the number of byssus threads extending outside the painted surface that easily adheres to marine structures.

This creature was used in the experiment because it was easy to obtain objective data by counting the number of byssus threads in the table test. The specific method for fixing the mussel A is to instantaneously attach the mussel to the central part coated with the anti-adhesion material M, for example, directly, or as in this experiment, by interposing a piece of rubber with a thickness of about 1.2 fins. The specimens were fixed with a chemical agent, etc., and were placed in a seawater tank for a week to observe how the byssus threads had settled. This reveals that the byssus threads are acrylic F, R, and P on the outside beyond the anti-wearing material M.

If the byssus threads of the mussel are stretched on the substrate 1, it is clear that the byssus threads of the mussel are avoiding the anti-adhesion material M, and the number of byssus threads that have grown outside the anti-adhesion material is greater than the number of byssus threads that have grown. It is inferred that the larger the ratio (%), the better the adhesion prevention effect is obtained.

This test was conducted using three samples, and the results are shown in the table above. According to this, in the present invention, 27 out of 27 byssus threads in sample 1, 7 out of 9 in sample 2, and 40 out of 52 in sample 3 have diameters. The byssus was extended 5 cm outside the painted surface, and its repellency rate was 84% on average. This is because the other comparison sample is Ihara Chemical Industry Co., Ltd.'s bottom antifouling paint Imotank 30.
0, the average is 34%, in the paint mixed with powdered oyster shells disclosed in JP-A No. 53-102340, the average is 28%, and in the paint mixed with chili peppers. This was confirmed to be a significant effect compared to the average of 31% and 28% for paints that do not contain antifouling components (actually, Acrizo Ink A-198-XB manufactured by Dainippon Ink and Chemicals Co., Ltd. was used). It is something that Incidentally, the four reagents listed as comparative samples have already been pointed out as having pesticidal effects in other literature, but the present invention shows remarkable effects even when compared with them. be.

[Brief explanation of the drawing]

The drawing is a perspective view showing a test method for the material for preventing adhesion of aquatic organisms according to the present invention. 1; Acrylic F, R, P, substrate A; mussel a; byssus M; adhesion prevention material

Claims (1)

[Claims] A material for preventing the adhesion of aquatic organisms, characterized in that a fine powder obtained by drying tightly bonded particles of zinc oxide (ZnO), titanium dioxide (TiO_2), and water (H_2O) is contained in a paint.