JPS5935881B2 - Aquatic pest antifouling agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula (wherein, X represents NO2, Br, or
, 2, and n is an integer of 0 or 1.

), which is characterized by containing a furan-based compound, and further includes:
The present invention provides a method for preventing aquatic pests from adhering to waterways by adding a furan compound represented by the above general formula as an active ingredient together with a diluent to waterways.

Currently, large amounts of seawater are used as industrial cooling water in thermal power plants, petrochemical factories, etc., and waterways, heat exchangers, etc. that use seawater are
Hydrozoa, bacteria, and shellfish and seaweed such as bryozoans, bryozoans, sea lettuce, blue seaweed, shiomidoro, and itahoya, which are caused by hydrozoa, bacteria, and documents, can adhere, causing problems such as a decrease in the amount of seawater inflow and a decrease in cooling efficiency. There is.

Conventionally, chlorine, formalin, etc. have been used to prevent these organisms from adhering to waterways, etc., but they have drawbacks such as being highly toxic to water and corroding equipment, and their effectiveness is limited. It wasn't something I was looking for.

However, the present inventors found that the furan-based compound represented by the above general formula not only has low toxicity to fish and edible shellfish, but also has extremely low toxicity to fish and edible shellfish, is extremely easy to handle, and does not dissolve into water. The amount is extremely small;
We have completed the aquatic pest antifouling agent of the present invention by discovering that it exhibits stable effects over a long period of time.

In order to use the underwater antifouling agent of the present invention in waterways, a furan-based compound and various dilution aids, such as solvents and surfactants, are blended to form a formulation in the form of an emulsion, an irrigation agent, and the like.

It is preferable to use the drug solution at a concentration of about 0.05 to 1 pharynx for the above-mentioned larvae.

Next, a formulation example will be shown.

Formulation example 1 (hydrating powder) Compound 9) 30%, white carbon 30%, diatomaceous earth 3
5%, sodium alkylbenzenesulfonate, 3%, and sodium ligninsulfonate, 2%, are uniformly mixed and pulverized to prepare a wettable powder.

Before use, dilute to the specified concentration.

Formulation example 2 (emulsion) Compound (5) 20%, surfactant Tsurupol (registered trademark name: Toho Chemical Industry Co., Ltd.) 16%, xylene 65%
to make an emulsion.

Before use, dilute to the specified concentration.

These formulation examples specifically describe a method particularly effective for the purpose of the present invention, and are not limited to these, and various formulation examples are possible.

Furan compounds that can be used in the antifouling agent of the present invention include:
These include:

These compounds can be produced by a combination of nitration or decarboxylation of substituted or unsubstituted furancarboxylic acids.

For example, nitration of furan-2-carboxylic acid with sulfuric acid and nitric acid produces 2-nitrofuran and 2,5-dinitrofuran, and nitration of 2-methylfuran with acetic anhydride and nitric acid produces 2-methyl-5- Nitrofuran can be produced.

This will be explained using the following test example.

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

Murasaki mussel and Fujibbo 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 under a microscope.

The results are shown in Table 1. However, the action characteristics of this drug are shown below.

0 Products that completely prevent adhesion by exhibiting a shellfishing effect on larvae ・・・・・・・・・・・・+0 Products that do not kill larvae but have a shell-closing effect and movement stopping effect, thereby preventing adhesion.・・・・・・± 0 Things that are not effective in preventing adhesion ・・・・・・
-Test Example 2 A waterway test was conducted for three months in winter using three seawater cooling channels.

The type of waterway is a temporary type. Each waterway has 10
00 m/hr flow rate.

An emulsion was prepared according to Formulation Example 2, and an investigation was conducted using one drug and one waterway.

The method for adding the chemicals was to dilute 500 g of each emulsion in 10 m3 of seawater, and inject the entire diluted solution into the waterway over a period of one hour.

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 ppm
(O, ippm as an active ingredient).

A chlorine gas area and an untreated area were established as control areas, and the chlorine concentration in the waterway in the chlorine gas area was maintained at lppm during the test period.

The trial began on January 10th and its efficacy was determined on March 15th.

The effectiveness is determined by placing a 100mm x 100m wall on the central wall of the waterway.
Three slate plates of size M were provided, and the adhesion of the larvae and seaweed that had grown on them was determined with the naked eye.

The test results are shown in Table 2.

Claims (1)

[Claims] 1 General formula (where X represents NO□, Br or ■, m is 0 or 1
, 2, and n is an integer of 0 or 1. ) An aquatic harmful organism antifouling agent characterized by containing a furan-based compound shown in