JPS63303904A - Controller for underwater harmful organism - Google Patents

Abstract

PURPOSE:To obtain a controller for harmful organism in water having no problems with safety, hygiene and environmental aspects, comprising a specific isothiocyanate compound, an organism component contained in a purified oil of spice or sharp plant or an analog compound. CONSTITUTION:A controller for underwater harmful organisms which is obtained by directly dissolving or dispersing one or a blend of isothiocyanate compounds [e.g. CH3-S-(CH2)3-NCS] shown by the formula (R is 1-7C aliphatic hydrocarbon residue, phenyl or benzyl; n is 1-15) or by blending one compound or the blend with a wettable powder into an aqueous system and is used in the form of an aqueous solution or water dispersion. The herbicide has low toxicity and persistence, has no bad influence on ecological system and operation environment and strongly controlling effects on microorganism such as bacteria and diatoms in water and large-sized attaching substances with extremely low concentration.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an aquatic pest control agent for preventing damage caused by attachment and breeding of pests in seawater or industrial water systems. In other words, damage caused by fouling organisms on the surfaces of underwater structures such as ships, marine structures, fishing nets, buoys, and seawater conduit pipes, as well as reduced functionality due to slime adhesion and bacteria in paper manufacturing processes, industrial cooling water systems, circulating water cooling systems, etc. The purpose of the present invention is to provide an aquatic pest control agent that prevents damage such as deterioration of water quality due to the abnormal proliferation of aquatic organisms.

Conventional technology Undersea structures such as ships, marine structures, seawater conduits for coastal plants, fishing nets, aquaculture rafts, buoys, etc.
Large attached animals and plants such as mussels and sea lettuce, and microorganisms such as diatoms and bacteria adhere to structures, resulting in corrosion of structures, increased seawater drag resistance of ships, large numbers of fish and shellfish dying due to clogging of fishing nets, and sedimentation due to increased weight. Damages such as decreased work efficiency will occur. In addition, in industrial water systems such as cooling water that uses natural water such as river water and lake water, and in circulation cooling systems that use medium and tap water, bacteria, diatoms, orchid rings, and blue-green algae often grow abnormally, causing water quality to deteriorate. This causes problems such as a decrease in cooling efficiency, blockage of water pipes, and a decrease in flow rate due to deterioration and adhesion to vessel walls.

In addition, the slime generated during the paper pulping process in the paper industry causes a significant deterioration in the quality of paper products. Conventionally, inorganic heavy metal compounds, organic metal compounds, heavy metal salts, and organic phosphorus have been used to prevent damage caused by harmful organisms in the water. Pesticides are being used to control the disease, including inorganic and organic halogen agents. For example, antifouling paints have traditionally been applied to the bottom of ships, the walls of seawater inlets, fishing nets, etc., and these antifouling paints contain antifouling agents such as inorganic copper compounds and organic tin compounds. Drugs 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 added to the water system either directly or in combination with a hydrating agent, dissolved or dispersed. Control using these agents often does not show sufficient effects at low concentrations of elution and dissolution, and furthermore, at effective concentrations, they are also highly toxic and highly persistent, which is undesirable from the viewpoint of environmental hygiene and pollution.

Problems to be Solved by the Invention Therefore, there is a need for an aquatic pest control agent that has low toxicity, low persistence, and does not have a negative impact on the ecosystem or working environment. It is an object of the present invention to provide such an aquatic pest control agent.

Means for Solving the Problems The above object can be achieved by the aquatic pest control agent according to the present invention, which is characterized by containing the following specific isothiocyanate compound as an active ingredient.

That is, in the present invention, the following general formula (I) R-S-(C)12h;-NCS (wherein R is an aliphatic hydrocarbon residue having 1 to 7 carbon atoms, a phenyl group, a tolyl group, or a benzyl group; One or a combination of two or more alkylthioalkyl isothiocyanate compounds or arylthioalkyl isothiocyanate compounds represented by n is 1 to 15) is used as an active ingredient, and it is one of the conventionally used antifouling agents. Part or all of these compounds may be replaced in the form of an antifouling paint, or one or more isothiocyanate compounds represented by formula (I) may be used directly or in combination with a hydrating agent. It is dissolved or dispersed in an aqueous system and provided as an aquatic pest control agent in the form of an aqueous solution or dispersion.

The isothiocyanate compound represented by the general formula (I) is originally a biological component or its analogous compound contained in essential oils of spices and pungent plants, and is highly degradable in nature.
Persistence and accumulation are not a problem at all, but it has a strong control effect on microorganisms such as bacteria and diatoms in the water, as well as large sessile organisms in the sea, even at extremely low concentrations. Therefore, the aquatic pest control agent of the present invention can be used as an antifouling paint or as an antifouling agent for fishing nets. When used as a coating composition, one or a combination of two or more isothiocyanate compounds of general formula (I) is added to the coating composition in an amount of 0.5 to 50%, preferably 1 to 30%.
By containing % by weight, a strong antifouling effect is exhibited for more than one year. In this case, the paint composition that can be selected may be one that has been conventionally used. For example, the resin vehicle may include vinyl chloride resin, chlorinated rubber resin,
Chlorinated polyethylene resin, chlorinated polypropylene resin,
Acrylic resin, styrene-butadiene resin, polyester resin, epoxy resin, polyamide resin, petroleum resin,
Silicone resin, silicone rubber 111f F'l
Ti, wax, paraffin, rosin ester, rosin resin, and resin containing a metal element such as tin, copper, zinc, tellurium, etc. in the side chain are used alone or in combination. Furthermore, although it is not essential for the antifouling function, it is also possible to further incorporate a known antifouling agent as an antifouling agent.

In addition, commonly used plasticizers, coloring pigments, extender pigments, solvents, etc. can be contained in arbitrary proportions. Further, in the production of paints, they can be prepared by methods known per se in the field of paint manufacturing technology.

On the other hand, when the aquatic pest control agent of the present invention is dissolved or dispersed in a cooling water system or the like and used, one or a combination of two or more isothiocyanate compounds of general formula (I) are added to the water system. . The amount added to the aqueous system is 0.1 to 50 ppm as an isothiocyanate compound.
A very strong pesticidal effect can be achieved at a low concentration, preferably from 0.5 to 30 ppm. As for the method of adding it to an aqueous system, it may be directly dissolved in the aqueous system, but after dispersing and dissolving it in an arbitrary hydrating agent such as an ionic surfactant, a nonionic surfactant, a water-soluble organic solvent, etc. You can also put it in. Further, the input may be continuous or intermittent, and can be arbitrarily selected depending on the water system and the occurrence of pests.

The present invention will be explained below with reference to Examples.

Examples 1 to 4 40 per hour in a waterway with a total length of 100 m and an average cross-sectional area of 0.1 m"
The control effect was investigated in an experimental waterway introducing seawater at a concentration of 0. A test solution prepared by dissolving 8 g of an isothiocyanate compound in 1 kg of dimethyl sulfoxide and mixing this with 9 kg of seawater is dripped at the waterway entrance over a period of 8 hours every day. The effect was investigated on the 10th day from the start of the experiment. The effectiveness was investigated using adhesive boards (hard vinyl chloride boards,
The wet weight of the organisms attached to the test tube (100X, 300X, 3.2 Dragon) was measured for 10 days, and a system containing no isothiocyanate compound was used as a control for comparison. The results are shown in Table 1.

(Leaving space below) The adhesion plates are installed A: Directly below the test water drop (channel entrance) B: 10 m from the channel entrance C: 25 m from the channel entrance D: 5 On + E: 1QOm from the channel entrance (channel outlet) The entire surface of the test plate was submerged in water. In addition, slime and small mussels were observed in the control area, but only slime was observed in the other experimental areas.

Examples 5 to 12 and Comparative Examples 1 to 2 The isothiocyanate compounds according to the present invention shown in Table 2, other components, and the components of the comparative examples were respectively charged into a ball mill and dispersed for 16 hours to produce antifouling paints and comparative examples. A paint was prepared. Antifouling tests were conducted on these antifouling paints and comparative paints. In the antifouling test, the antifouling paints and comparative paints shown in Table 2 were tested at 100× and 300×, which had been previously coated with a commercially available anticorrosive coating.
A test steel plate with a size of +lIm has a dry film thickness of 60 to 8
After coating to 0μ and drying for one day, the samples were immersed in the sea at a depth of 1 meter in a test raft off the coast of Tamano City, Okayama Prefecture, and the degree of contamination by attached organisms was investigated.

As Comparative Example 3, the above-mentioned test steel plate with anti-corrosion coating was simultaneously cleaned and investigated.

The results are shown in Table 3.

(Leaving space below) Note 1: Laroflex λIP-45 Vinyl chloride/vinyl isopropyl ether copolymer manufactured by BASF, West Germany Note 2: KE45-TS Made by Shin-Etsu Chemical - Liquid type room temperature curable silicone rubber Note 3: 5ll-510 oil Methylphenyl silicone oil manufactured by Toray Silicone (hereinafter referred to as the margin) Table 3 As can be seen from the examples above, it is clear that the aquatic pest control agent according to the present invention has extremely good effects.

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Claims (1)

[Claims] Formula R-S-(CH_2)-_nNCS (wherein R is an aliphatic hydrocarbon residue having 1 to 7 carbon atoms, phenyl group, tolyl group or benzyl group; n is 1 to 15) An aquatic pest control agent characterized by containing the following isothiocyanate compound as an active ingredient.