JPS63286476A - Underwater antifouling coating compound - Google Patents

Abstract

PURPOSE:To obtain the titled coating compound showing long-term antifouling effects, not causing environmental pollution, consisting of acrylic resin, rosin, cuprous oxide, copper oxide and a solvent. CONSTITUTION:The aimed coating compound containing preferably 15-30pts.wt. acrylic resin, preferably 5-10pts.wt. rosin, preferably 10-30pts.wt. cuprous oxide, preferably 10-30pts.wt. copper powder, 5-10pts.wt. verdigris and a proper amount of a solvent.

Description

[Detailed Description of the Invention] It is applied to the submerged surfaces of structures such as cooling water pipes in power plants to prevent parasitic infestation by aquatic organisms such as moths such as Fujibbo and algae such as blue laver. The present invention relates to an antifouling paint composition effective for.

In recent years, antifouling agents have been used as paints to prevent seaweed and shellfish from adhering to fishing nets and boat bottoms, and organic tin metal compounds such as tributyltin oxide have been widely used because of their sterilization and antifouling properties. However, recently, it has been found that it is poorly decomposable by microorganisms, accumulates frequently in the environment, and is toxic, so restrictions on its use are being considered.

[Problems to be solved by the invention]

The object of the present invention is to provide an underwater antifouling paint that does not cause environmental pollution under such conditions.

[Means for solving problems]

The present invention was created as a result of intensive studies in view of the above-mentioned actual situation, and its outline is as follows.

An underwater antifouling paint consisting of acrylic resin, rosin, cuprous oxide, copper powder, patina, and a solvent.

However, the preferred blending ratio is acrylic resin 15~
30 parts by weight, 5 to 10 parts by weight of rosin, 10 to 3 parts by weight of cuprous oxide
The paint consists of 0.31 parts, 10 to 1 part of copper powder, 5 to 10 parts by weight of patina, and an appropriate amount of a solvent.

[Effect]

A preferred acrylic resin is one or more of the compounds represented by CH: C-Go, CM, CH-R'H (in the formula, R and R' represent a hydrogen atom or a methyl group) or 28i or more in an amount of 1 to 10% by weight. An antifouling coating film is formed with a copolymer obtained by copolymerizing 90 to 99 parts by weight of one or more unsaturated compounds consisting of acrylic ester and methacrylic ester.

Examples of the compound (monomer) represented by the above general formula include hydroxyedel methacrylate, hydroxyedel acrylate, hydroxypropyl methacrylate, and hydroxyglobil acrylate. Examples of unsaturated compounds to be copolymerized with these monomers include butyl acrylate, ethyl acrylate, and α-acrylate.
- Acrylic acid esters such as chloroethyl, propyl acrylate, butyl acrylate, amyl acrylate, hexyl acrylate, cyclohexyl acrylate, octyl acrylate, dodecyl acrylate, octadecyl acrylate, benzyl acrylate, phenyl acrylate, and methacrylate Methyl methacrylate, ethyl methacrylate, butyl methacrylate, hexyl methacrylate, octyl methacrylate,
Examples include methacrylic acid esters such as octadecyl methacrylate. Furthermore, when used as a marine paint, it forms a smooth coating film and has little resistance to movement underwater.

And this acrylic resin has 15 to 30% for coating film formation.
Preferably 15 parts by weight! If the amount is less than 30 parts, the amount of adhesion to the object will be too small and a tough film will not be obtained;
If the amount exceeds the weight part, the resin component will be too large and a tough film will not be obtained.

In addition, rosin gradually dissolves into the alkaline seawater and helps elute copper ions, and the amount of rosin added is 5.
If it is less than 10 parts by weight, the elution rate will be slow, and if it exceeds 10 parts by weight, the elution rate will be too fast, resulting in a decrease in antifouling performance, and if applied to the bottom of a ship, etc., the resistance to running will increase. I don't like it.

Next, cuprous oxide, copper powder, and patina all convert into copper ions in water, and prevent the adhesion and propagation of the secretions produced when organisms attach to them through the copper ion effect.
It exhibits an antifouling effect, including the change to u”+.

The reason why three types of copper-based substances, cuprous oxide, copper powder, and verdigris, are used together is that the elution rate of Cu ions into water is different, and copper powder has a lower initial elution rate of Cu ions than seawater. Due to its large amount, the initial antifouling effect can be enhanced, and cuprous oxide
Due to the large amount of elution of u"+ and the slow production of Cu++ compared to copper powder, including the change from Cu+ to Cu++ in water,
An initial antifouling effect cannot be expected, but after a certain period of time, Cu++ is gradually generated in the water, achieving a sustained antifouling effect.

In addition, the patina has extremely low elution of Cu+ in seawater, and is blended to achieve a long-lasting antifouling effect. Therefore, depending on the purpose, this can be omitted. The copper powder used in the present invention may be any of electrolytic copper powder, atomized copper powder, and ground pulverized copper powder, but pulverized copper powder is usually used for paints.

As the patina, copper salts such as basic carbonate steel, basic acetate steel, basic copper chloride, and basic sulfate steel can be used alone or in the form of a mixture. If the content of copper powder and cuprous oxide is less than 10 parts by weight, the contact area of copper per unit area with seawater will be insufficient, the antifouling effect will be insufficient, and the sa
If the amount of M is too high, the amount of copper ions eluted will be too large, making it impossible to obtain a normal coating film state.

Also, if the patina is less than 5 parts by weight, the amount of copper particles eluted will be too small and the long-term antifouling effect will be poor, and if it exceeds 10 parts by weight, it will be difficult to obtain a normal coating film condition. .

Examples Samples (paints) of Examples of the present invention and Comparative Examples were prepared with the formulations shown in the following table.

Each sample above! Iron plate treated with anti-corrosion paint (30
0 x 100
The adhesion status of organisms was observed after 12 months and 12 months.

The results are shown in the table below.

The evaluation is based on the area on which living things are attached to the naked eye ←) It is clear from comparative tests that go beyond the effectiveness of the invention.The product according to the present invention exhibits an antifouling effect for a very long time, and there is no risk of causing pollution. do not have.

Claims (2)

[Claims] (1) Underwater antifouling paint characterized by consisting of acrylic resin, rosin, cuprous oxide, copper powder, and solvent. (2) 15 to 30 parts by weight of acrylic resin, 5 to 10 parts of rosin
The underwater antifouling paint according to claim 1, comprising 10 to 30 parts by weight of cuprous oxide, 10 to 30 parts by weight of copper powder, 5 to 10 parts by weight of verdigris, and an appropriate amount of a solvent.