JPH07324009A - Underwater pest control agent - Google Patents

Abstract

(57) [Summary] [Structure] Expression An aquatic pest control agent containing an isothiocyanate compound represented by the formula (wherein R is a linear or branched hydrocarbon residue having 1 to 10 carbon atoms) as an active ingredient [Effect] Ships, marine structures, fishing nets, buoys , It is effective in preventing damages due to fouling organisms on the surface of underwater structures such as seawater conduits, or in preventing damage such as water quality deterioration due to slime adhesion in industrial cooling water systems and bacterial overgrowth, and adversely affects the ecosystem and work environment. It is possible to provide pest control agents in water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aquatic pest control agent for the purpose of preventing damage caused by adhesion and reproduction of pests in seawater or industrial water systems.

That is, ships, marine structures, fishing nets, buoys,
Harmful underwater to prevent damages due to fouling organisms on the surface of underwater structures such as seawater conduits and damages such as functional deterioration due to slime adhesion and abnormal deterioration of water quality due to abnormal growth of bacteria in industrial cooling water systems, circulating water type cooling devices, etc. A biological control agent is provided.

[0003]

BACKGROUND OF THE INVENTION Seawater structures, such as ships, marine structures,
Large adherent flora and fauna such as barnacles, mussels, and sea lions and microscopic organisms such as diatoms and bacteria adhere to seawater canals, fishing nets, rafts for cultivating water, and buoys at seaside plants, causing structure corrosion and increasing seawater friction resistance of ships. However, damages such as a large amount of hay death of seafood due to clogging of fishing nets, sedimentation due to increased weight, and reduced work efficiency will occur.

In addition, in industrial water systems such as cooling water using natural water such as river water and lake water, and circulation type cooling devices using inside and tap water, bacteria, diatoms, cyanobacteria, and green algae often breed abnormally. However, it causes problems such as deterioration of water quality and deterioration of cooling efficiency due to adhesion to vessel walls, blockage of water pipes and reduction of flow rate.

Further, the slime generated in the paper pulp process in the paper industry causes a remarkable deterioration of the quality of paper products.

[0006] As a method for preventing such damage by pests in water, control has conventionally been carried out with chemicals such as inorganic heavy metal compounds, organic metal compounds, heavy metal salts, organic phosphorus agents, inorganic and organic halogen agents.

For example, a method of coating an antifouling paint has conventionally been applied to the outer bottom plate surface of a ship, the wall surface of a seawater introduction path, a fishing net, and the like, and the antifouling paint uses an inorganic copper compound or organic tin as an antifouling agent. Drugs such as compounds are mainly used.

In the cooling water system, agents such as organic metal agents, organic phosphorus agents, inorganic and organic halogen agents, and peroxides are dissolved or dispersed directly or in combination with a hydrating agent and added to the aqueous system.

Control by these agents is effective for low concentration elution,
Dissolution often does not show sufficient effects, and at effective concentrations, it is also highly toxic and highly persistent, which is not preferable from the viewpoint of environmental hygiene and pollution.

[0010]

[Problems to be Solved by the Invention] Therefore, there is a demand for an aquatic pest control agent which has safety and health and environmental problems, that is, has low toxicity and persistence and does not adversely affect the ecosystem and working environment. Therefore, it is an object of the present invention to provide such an aquatic pest control agent.

[0011]

The above object can be achieved by an aquatic pest control agent containing the following specific isothiocyanate compound according to the present invention as an active ingredient.

That is, according to the present invention,

[Chemical 1] (Wherein R is a straight-chain or branched hydrocarbon residue having 1 to 10 carbon atoms), and one or a combination of two or more hydroxyphenyl-substituted alkylisothiocyanate compounds is used as an active ingredient. Some or all of the conventionally used antifouling agents are replaced with these compounds in the form of antifouling paints, or one or a combination of two or more isothiocyanate compounds represented by Chemical formula 1 is directly or It can be provided as an underwater pest control agent in the form of an aqueous solution or an aqueous dispersion by dissolving or dispersing it in an aqueous system in combination with a wettable powder or the like.

The isothiocyanate compound represented by the chemical formula 1 is originally a biological component contained in spices and essential oils of spicy plants or a related compound thereof, and is highly degradable in nature, and has no residual or accumulating property. Although it is not a problem, it has a strong control effect against extremely small organisms such as bacteria and diatoms in water and large adherent organisms in the sea at a very low concentration.

Therefore, the elution amount and the dissolution or dispersion amount of the aquatic pest control agent according to the present invention in water are sufficiently small to exert a sufficient effect.

When the aquatic pest control agent according to the present invention is used as an antifouling paint or an antifouling agent for fishing nets, one or a combination of two or more isothiocyanate compounds of Chemical formula 1 is added to the coating composition. 5 to 50% by weight, preferably 1 to
By containing 30% by weight, it exerts a strong antifouling effect for over 1 year.

In this case, the coating composition which can be selected may be one conventionally used. For example, the resin vehicle may be a vinyl chloride resin, a chlorinated rubber resin, a chlorinated polyethylene resin, a chlorinated polypropylene resin or an acrylic resin. Resin, styrene-butadiene resin, polyester resin, epoxy resin, polyamide resin, petroleum resin, silicone resin, silicone rubber resin, wax, paraffin, rosin ester, rosin resin and tin, copper,
A resin containing a metal element such as zinc or tellurium in its side chain is used alone or in combination.

Although not essential for the antifouling function, a known antifouling agent may be added as an antifouling auxiliary agent.

In addition, a commonly used plasticizer, coloring pigment, extender pigment, solvent and the like may be contained in any proportion.

In the paint manufacturing, it can be prepared by a method known per se in the technical field of paint manufacturing.

On the other hand, when the aquatic pest control agent according to the present invention is used by dissolving or dispersing it in a cooling water system or the like, one or two of the isothiocyanate compounds of Chemical formula 1 are used.
A combination of one or more species is added to the water system.

The amount of the isothiocyanate compound added to the water system is 0.1 to 50 ppm, preferably 0.5 to 3
A very strong control effect can be achieved at a low concentration of 0 ppm.

The method of adding to the water system may be such that it is directly dissolved in the water system, but it is previously dispersed and dissolved in any hydrating agent such as an ionic surfactant, a nonionic surfactant or a water-soluble organic solvent. Then, you may throw in.

Further, the charging may be continuous charging or intermittent charging, and can be arbitrarily selected depending on the water system and the generation status of pests.

The present invention will be described below with reference to examples.

Examples 1 to 4 Total length 100 m, average cross-sectional area 0.1 m ²
The control effect was examined in an experimental waterway in which 400 l of seawater was introduced into the waterway of 1 hour. 8 g of isothiocyanate compound
Was dissolved in 1 kg of dimethyl sulfoxide,
The test solution mixed with g of seawater is added dropwise at the entrance of the waterway every day for 8 hours. The effect was investigated 10 days after the start of the experiment. The effect investigation was conducted on 10 adherent plates (hard vinyl chloride plate, 100 x 300 x 3.2 mm) installed in 5 places of waterways.
The measurement was performed by measuring the wet weight of the organisms adhered over the day, and the system containing no isothiocyanate compound was compared as a control.
The results are shown in Table 1.

[0025]

[Table 1]

Dispersion paints were prepared by a high-speed dispers with the formulations shown in Table 2 to prepare the antifouling paints of Examples 5 to 11 and the paints of Comparative Examples 2 and 3.

[Table 2] In the table, Note 1 ... Laroflex MP-45 West Germany BASF vinyl chloride / vinyl isopropyl ether copolymer Note 2 ... Liquid paraffin JIS K2231 ISOVG68 equivalent Note 3 ... KE-45 liquid type room temperature Curable silicone rubber Note 4 ... SH-510 oil Methylphenyl silicone oil manufactured by Torresicone Co., Ltd.

These coatings were applied to 100 × 300 × 3.2 mm test iron plates which had been subjected to anti-corrosion coating so that the dry film thickness was about 100 μ, and after drying for 2 days, the water depth was about 1 m off Tamano City, Okayama Prefecture. It was immersed in the sea and the state of organism attachment was investigated.

The results are shown in Table 3. Comparative Example 4 is one in which a test plate as coated with anticorrosion was immersed.

From the results shown in Tables 1 and 3, the hydroxyphenyl-substituted alkylisothiocyanate compound according to the present invention showed an excellent effect in controlling pests in water.

[Table 3]

Claims (1)

[Claims] 1. Chemical formula 1 An aquatic pest control agent comprising an isothiocyanate compound represented by the formula (wherein R is a linear or branched hydrocarbon residue having 1 to 10 carbon atoms) as an active ingredient.