JPH0365321B2 - - Google Patents

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates to an agent for controlling sea breath-fouling organisms. [Prior art] Seawater contains plants such as green algae and brown algae, barnacles,
It is home to a wide variety of sea creatures, including animals such as serpura, sea squirt, sea squirts, mussels, and oysters, as well as various types of bacteria and mold called slime. Such organisms adhere to the inner surfaces of the water intakes and cooling pipes of cooling water systems in thermal power plants, steel mills, and other factories that use seawater, causing a decline in their functionality.
In addition, attached sea creatures are ripped off by water pressure and flow velocity, causing clogging of other parts such as the tubes and strainers of the heat exchanger, blocking the flow of seawater and reducing the functionality of the entire facility. . The attachment and reproduction patterns of these organisms are generally considered as follows. a Slime and algae adhere to and multiply on solid surfaces such as pipes due to the action of the sticky substances that produced them. b Larvae or eggs of sessile animals such as shellfish adsorb to the sticky substance of algae in the slime and grow there. It grows by feeding on slime and algae. Therefore, the following two methods can be considered as methods for preventing the attachment of sessile organisms to shellfish. These are treated with chemicals that kill or repel the shellfish themselves. Prevents the adhesion of slime and algae, which serve as hotbeds for shellfish to grow. As a drug for the above, formaldehyde has been proposed (Tokuko Showa).
45-12155). However, this product did not exhibit good control effects against bacteria and algae, and also had the disadvantage that it was less effective against barnacles and the like. On the other hand, sea breath-fouling biological control agents made of sodium hypochlorite and organic tin compounds have also been proposed. However, since sea breath biological control agents are often used in systems that use seawater as cooling water (seawater-supercooling water systems) as described above, they are required to be harmless to other organisms in the sea. However, all of these compounds pose a problem of toxicity to fish and the like. In particular, organic tin compounds are difficult to be decomposed by microorganisms and are highly toxic, so they may pollute the environment and affect marine resources, so a low-toxicity sea breath control agent is desired. [Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to treat plants such as algae,
It is an object of the present invention to provide a sea-breath-fouling organism control agent that extremely effectively prevents the adhesion and reproduction of various marine organisms such as animals such as shellfish and slime, and has extremely low toxicity to fish and the like. [Structure of the Invention] As a result of intensive studies to achieve this object, the present invention has been made based on the results that specific aldehyde compounds and/or aldehyde derivatives have the effect of preventing the adhesion of slime and algae, and of sessile animals such as shellfish, even at low concentrations. Has a repellent effect and extremely good slime adhesion prevention effect.
The present invention has been achieved by discovering that the present invention exhibits the effect of preventing algae adhesion and the effect of controlling sea breath adhering organisms. That is,
The gist of the present invention is a sea breath insect control agent characterized by containing at least one compound selected from the group consisting of glutardialdehyde, hydroxypropionaldehyde, acrolein diacetal, and acrolein diacetate. be. The present invention will be explained in detail below. The sea breath insect control agent of the present invention contains at least one compound selected from the group consisting of glutardialdehyde, hydroxypropionaldehyde such as 3-hydroxypropionaldehyde, acrolein dimethyl acetal, and acrolein diacetate, In particular, those containing acrolein dimethyl acetal or acrolein diacetate are most preferred. Conventionally, it has been known that certain aldehyde compounds such as formaldehyde are active as preservatives or bactericidal agents when used at extremely high concentrations (1000 ppm or more). It is completely unknown that propionaldehyde exhibits an algal adhesion prevention effect and a sea breath adhering animal control effect, and that it does so at low concentrations (10 ppm or less). Furthermore, the physiological effects of aldehyde derivatives such as acrolein dimethyl acetal and acrolein diacetate on seawater slime, seawater algae, and sea-breathing animals are completely unknown. In the pest control agent of the present invention, it is preferable to use it after diluting it with water, methanol, ethanol, dimethylformamide, dimethyl sulfoxide, ethylene glycol, diethylene glycol monomethyl ether, N-methylpyrrolidone, or the like. The amount of the pesticidal agent of the present invention to be added may vary depending on the type of compound contained, since the physiological activity against slime, algae, and marine organisms may vary, and the amount of attached slime, algae, and marine organisms generated may vary. If there is a large amount, it is necessary to increase the amount added, etc.
Although not unique, the amount of the above-mentioned compound added is generally 0.01 to 100 ppm, preferably 0.5 to 10 ppm.
A relatively low concentration may be sufficient, and it is preferable to inject this for 1 to 24 hours a day. [Examples of the Invention] The present invention will be explained in more detail by Examples below, but the present invention is not limited to the following Examples unless the gist of the invention is exceeded. Example 1 Using a model waterway 1 as shown in FIG. 1, the effect of each compound on controlling sea breath attached organisms was investigated. In FIG. 1, 2 is a submersible pump that supplies seawater to the model waterway 1. 3 is a drug tank, and the stored drugs are supplied to the model waterway 1 by a chemical pump (not shown). Note that 4 is a branch header. Model waterway 1 is 2.5 cm wide x 8 cm deep x 1 m long, the flow rate of seawater passing through it is 10/min, and the flow rate is 8 cm.
cm/second. A SUS attachment plate is immersed in this model waterway,
Seawater was passed through the water for about one month, and the compounds shown in Table 1 were injected from the chemical tank 3 using a chemical pump in the amount and time shown in Table 1 to remove seawater from the seawater (bacterial slime, algae, and mussels). , barnacles) were observed and compared between the case where the compound according to the present invention was added, the case where no compound was added (blank), and the case where formaldehyde was added. The results are shown in Table 1. From Table 1, it is clear that according to the sea breath attached organism control agent of the present invention, sea breath attached organisms can be effectively controlled by addition of a low concentration.

[Table] In Table 1, + indicates the following 5-level evaluation based on visual and microscopic observation. Extremely much adhesion A lot of adhesion Somewhat much adhesion + Slight adhesion - No adhesion In addition, in order to confirm the safety when the compound according to the present invention is released into public seawater, the compound according to the present invention was Tested for degradability. The test method is the decomposition degree test of chemical substances by microorganisms (Environmental Protection Collection No. 5, Yakuhatsu No. 615,
49 Base Station No. 392) under the following conditions. Equipment: Closed system oxygen consumption measuring device Sludge concentration: 30ppm PH: 7.0 Temperature: 25℃ Test period: 14 days Compound addition: Approximately 100ppm Concentration (solid content) At the start and end of the test (after 14 days of contact with microorganisms)
The TOC value, decomposition rate, and BOD value are shown in Table 2.

【table】

〔Effect of the invention〕

As described in detail above, the sea breath-fouling organism control agent of the present invention can extremely effectively control the attachment and proliferation of various sea-breath organisms such as slime, algae, and shellfish in seawater, and the additive concentration can also be reduced. Low concentration is sufficient. Moreover, the sea breath-fouling organism control agent of the present invention is easily decomposed by microorganisms, has extremely low toxicity to other organisms such as fish, and does not cause environmental pollution, and is extremely advantageous industrially. .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view schematically showing a seawater transit type model waterway used in an example of the present invention. 1...model waterway, 2...submersible pump, 3...chemical tank.

Claims (1)

[Scope of Claims] 1. A sea breath-fouling organism control agent characterized by containing at least one compound selected from the group consisting of glutardialdehyde, hydroxypropionaldehyde, acrolein dimethyl acetal, and acrolein diacetate. 2. A sea breath-fouling organism control agent according to claim 1, which contains acrolein dimethyl acetal.