JPS6017766B2 - Aquatic pest adhesion prevention agent - Google Patents

Description

Detailed Description of the Invention The present invention is based on the general formula or the general formula (X represents a nitro group, a lower alkyl group, a halogen atom, an acetyloxy group, a thiocyanomethyl group, and Xn forms a polymethylene and bonds to a benzene nucleus. be able to.

n represents 0, 1-5, m represents 1-3, and a represents 0, 1, 2. ) The present invention relates to an aquatic pest adhesion prevention agent characterized by containing an aralkyl thiocyanate compound represented by the above general formula as an active ingredient. The present invention provides a method for preventing aquatic pests from adhering to waterways or underwater structures, equipment, fishing nets, etc. by adding the ingredients directly or together with a diluent to waterways, etc.

Currently, large amounts of seawater are used as industrial cooling water in thermal power plants, petrochemical factories, etc.
Shellfish and seaweed such as odoriferous insects, bryozoans, bryozoans, lettuce, algae, seaweed, and itapoa are attached, causing problems such as a decrease in the amount of seawater inflow and a drop in cooling efficiency.

Conventionally, chlorine, formalin, etc. have been used to prevent these organisms from attaching to waterways, etc., but they have drawbacks such as being highly toxic to humans and animals, corroding equipment, and furthermore, their effectiveness is limited. It wasn't great. However, the present inventors have discovered that the aralkyl thiocyanate compound represented by the above general formula not only has low toxicity to humans and animals, but also extremely low toxicity to fish and edible shellfish, is extremely easy to handle, and has stable effects. The inventors have found that the present invention exhibits a long-lasting effect, and have completed the novel aquatic pest adhesion prevention agent of the present invention.

Among marine organisms, the aralkyl thiocyanate compounds of the present invention have extremely low toxicity to fish and shellfish, and also have low toxicity to algae. It acts specifically on harmful organisms, and is particularly effective against larvae of aquatic harmful organisms at very low concentrations.

The aquatic pest adhesion prevention agent comprising the aralkyl thiocyanate-based compound of the present invention can be applied to seaweeds in seawater and freshwater,
It has the effect of quickly bringing shellfish, etc. into a state of asphyxia or asphyxia at a low dose.

As a result, obstacles caused by mussels, barnacles, oysters, hydrozoans, etc. or the above-mentioned seaweeds can be easily removed. For example, in the life history of the common seawater pest, the mussel, after its eggs are fertilized,
The juvenile shellfish becomes an adult shellfish through various stages called D-shaped larvae, ambo stage, etc., but aralkyl thiocyanate compounds have the effect of causing remarkable asphyxia in larvae up to the ambo stage. It is possible to completely prevent attachment of larvae. Also, the barnacles are nauplius,
It goes through a larval stage called Cypris and then becomes an adult shellfish, which is also highly effective against species up to Cypris, and has the same effect as preventing the attachment of purple mussels. By injecting into waterways at a concentration of 0.05 to 0.1 foot for 1 to 3 hours a day, attachment of seawater harmful organisms can be prevented.

The concentration of the chemical solution is less than 1/20th that of conventional chlorine and formalin. In order to use the compound of the present invention as an aquatic pest adhesion prevention agent, the aralkyl thiocyanate compound is formulated into a wettable powder or emulsion by adding various dilution aids such as a solvent and a surfactant. use.

In order to specifically explain the present invention, a formulation example will be shown.

% indicates weight percentage. Formulation example 1 Wettable powder compound side: 30% White carbon: 30%, Kichijou earth: 35%
%, sodium alkylbenzeso sulfonate 3%, and sodium lignin sulfonate 2% are uniformly mixed and ground to prepare a wettable powder.

Before use, dilute to the specified concentration. Formulation Example 2 An emulsion is prepared by mixing 20% emulsion compound [5], 16% surfactant Solpol (registered trademark, Toho Chemical Industries, Ltd.), and 65% xylene.

Before use, dilute to the specified concentration. These formulation examples specifically describe methods particularly effective for the purpose of the present invention, and are not limited to these examples, and various formulation examples are possible.

Next, typical examples of compounds used in the present invention are shown.

These specifically describe compounds that are particularly useful for the purpose of the present invention, and the present invention is of course not limited thereto. In addition, the compound number will be referred to later. Compound 1 Pale yellow crystal powder, melting point 51-53°C Compound 2 Yellow-brown crystal, melting point 51°C Compound 3 White powder, melting point 268-269°C Compound 4 Ocher needle-like crystals, high melting point 32-34°C Compound 5 Colorless small needles Compound 6 Crystallization at room temperature (16°C), melting point 145-150°C/15 mmHg Compound 7 Colorless transparent liquid, boiling point 105-11000/0.4 mmH
g Compound 8 Yellow liquid, boiling point 132°C - 0.3 mmHg Compound 9 White crystals, melting point 87°C Compound 10 Cream-colored powder, melting point 49-51°C Compound 11 Dark brown paper steel liquid, non-distillable Compound 12 Compound 13 Yellow brown viscous liquid , non-distillable compound 14 Cream-colored crystal powder, melting point 207-208℃ Compound 15 Pale yellow transparent liquid, crystallized after distillation Melting point 127-132℃, boiling point 038-141℃/5mm
Hg Compound 16 White needle-like crystals, melting point 132-134°C Compound 17 White cheek granular crystals, melting point 41°C Compound 18 Yellowish powdery crystals, melting point 65-68°C Compound 19 Colorless plate-like crystals, melting point 110-110°C 114℃ Compound 20 Pale yellow crystal mass, melting point 155-16000/15mmHg
Compound 21 Pale yellow transparent liquid, boiling point 121~12200~15mmHgCompound 22 Yellow transparent liquid, boiling point 115~
120℃/0.25mmHg Compound 23 Light yellow short strip
Crystallization after distillation Melting point 85.5-87℃, boiling point 164-16700/1.5mmHg Compound 24 Pale yellow transparent oily liquid, boiling point 142-14500/1.5mmHg Compound 25 Bright yellow transparent liquid, boiling point 150-150mmHg 15500/i7-18mmHg Compound 2
6-color plastic crystal melting point 88-89°C Next, the effect of the aralkyl thiocyanate compound of the present invention on harmful attached organisms in water will be shown.

Test Example 1 Each emulsion prepared according to Formulation Example 2 was diluted with seawater to a predetermined concentration.

Mussel and barnacle larvae, either artificially hatched or collected from the sea using a plankton net, were immersed in this diluted solution for 1 hour, and their survival and adhesion prevention effects were inspected using a microscope. The results are shown in Table 1. However, the action characteristics of this drug are shown below. 10: It can completely prevent attachment by exhibiting a shellfish killing effect on larvae. Noshi: Those that do not kill shellfish on larvae, but have shell-closing and motion-stopping effects, and as a result prevent attachment -: Those that are not effective in preventing attachment Table 1 Test example 2 Three cooling channels using seawater Using this, waterway tests were conducted for three months during the winter.

The type of waterway is a temporary type. Each waterway has 100
At 0, the flow rate is /m. An emulsion was prepared according to Formulation Example 2, and an investigation was conducted using one drug and one waterway. The method of adding the drug is to dilute 500 ml of each emulsion with 10 ml of seawater, and add this diluted solution to 1 ml of seawater.
It took some time to pour it all into the waterway. This operation was performed six times a day for three months. The concentration of the drug in the waterway (at the time of drug injection) is
0.5 legs (active ingredient: 0.1 breast). In addition, a chlorine gas area and an untreated area were established as control areas, and in the chlorine gas area, the concentration of chlorine in the waterway was maintained at one level during the test period. The exam is January 1st
It started on day 0 and efficacy was determined on March 15th. Efficacy was determined by visually determining the adhesion of small shells and seaweed on three slate boards measuring 10 by 10 by installing them on the central wall of the waterway. The results are shown in Table 2. Second
table

Claims (1)

[Claims] 1. General formula▲There are mathematical formulas, chemical formulas, tables, etc.▼ Or general formula▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, X is a nitro group, a lower alkyl group, a halogen atom,
It represents an acetyloxy group or a thiocyanomethyl group, and Xn can form polymethylene and bond to a benzene nucleus. n represents 0, 1-5, m represents 1-3, and a represents 0, 1, 2. ) An aquatic harmful organism adhesion prevention agent characterized by containing an aralkyl thiocyanate compound as an active ingredient.