JPH0441403A - Agent for preventing adhesion of marine organism - Google Patents

Abstract

PURPOSE:To provide the subject agent preventing the adhesion of marine organisms to marine structures only by the injection of the agent in sea water cooling systems by compounding a N-mono-substituted ditrimethylenetriamine or a monobasic acid salt thereof as an active ingredient. CONSTITUTION:An agent for preventing the adhesion of shellfish such as Mytilus, Balanus and Diospyros and marine organisms such as Hydroida to marine structures contains a compound of the formula (R is 9-22C saturated or unsaturated straight chain or branched chain hydrocarbon) or a monobasic acid salt thereof as an active ingredient. The agent may be added to the flow of sea water in an amount of 0.01-20 ppm for 1-24 hrs per 1 to 7 days. When employed, the agent may be dissolved in water, methanol, glycerol, DMF, etc., so as to be homogeneously dissolved or dispersed in the sea water, and further may be compounded with a surfactant. Since the stopping of the operation of marine structures is prevented, the agent gives large advantages on time and and economy.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an introduction path for a system that uses seawater as cooling water;
This invention relates to an agent for suppressing the adhesion of marine organisms to marine structures such as water pipes and plants.

<Conventional technology> As is well known, in thermal power plants, pig iron and steel mills, oil refineries, petrochemical plants, chemical plants, etc. that use seawater, marine organisms adhere to their cooling water systems and disrupt their functions. It is decreasing.

The marine organisms mentioned above include mussels, Fujibbo, and other shellfish.
Examples of attached organisms include hydrophiles, bryozoans, etc. When these marine organisms breed in waterways, water pipes, or plants, they can narrow the pipes and reduce the flow of seawater, or they can fall off and clog the heat exchanger tubes. It may corrode water pipes, etc.

Therefore, after a certain period of operation, the operation was stopped and physical cleaning was performed to remove the above-mentioned attached organisms and wash the corroded inner walls.

<Problem to be solved by the invention> However, the above-mentioned cleaning requires the suspension of operations, takes time and effort, and the above-mentioned marine organisms grow in a short period of time. There was a problem that it had to be cleaned frequently.

In recent years, aliphatic amines, ethylene oxide adducts of β-hydroxy substituted aliphatic amines, ethylene oxide adducts of N-monosubstituted propylene diamines, aliphatic Oxypropyleneamine, aliphatic ethylenecyamine,
It has been proposed to add trace amounts of amines such as secondary aliphatic amines, tertiary aliphatic amines, and quaternary ammonium salts.

<Means for Solving the Problems> The present invention has been proposed in view of the above, and has the general formula %) [wherein R is a saturated or unsaturated linear chain having 9 to 22 carbon atoms or It is a side chain hydrocarbon group. The present invention relates to a marine organism adhesion inhibitor containing as an active ingredient one or more of N-monosubstituted citrimethylenetriamine or its monobasic acid addition salt shown in the following.

That is, the marine organism adhesion inhibitor of the present invention suppresses the adhesion of various marine organisms by continuously or intermittently injecting 0.05 to 20 pp into seawater in waterways, water pipes, or plants. It is.

The various marine organisms whose adhesion is suppressed by the marine organism adhesion inhibitor of the present invention include shellfish such as mussels, Fujitbo, sea squirts, and oysters, and sessile organisms such as hydroids, oysters, etc.
Examples include bryozoans, bacteria, and algae.

The adhesion inhibitor for marine organisms of the present invention is added to seawater as described above, or the amount of the adhesion inhibitor added is generally 0.01 to 20 pp- with respect to the flow rate of seawater, and the amount of the adhesion inhibitor is generally 0.01 to 20 pp- per day.
It may be injected for 1 to 24 hours on the 7th.

If the amount added is too small, the effect will be low, and if the amount added is too large, there will be no further effect and it will be bad economically.

In addition, the amount of the above-mentioned marine organism adhesion inhibitor of the present invention may need to be reduced or increased depending on the type of marine organisms to be prevented from adhering. etc., a small amount may be sufficient, and if there are sessile organisms such as mussels and Fujitbo, and the amount of them is particularly large, the amount added should be #! Is there a need to measure it?

A characteristic feature of the effect of the marine organism adhesion inhibitor of the present invention is that it prevents the adhesion of shellfish and periphyton. That is, it kills the larval stage of the @-type shellfish and suffocates the already grown shellfish as it covers the composition or cells.

Examples of RNH(CHz)JH(CH2)JH2 of the present invention include R, tallow alkyl, coconut oil alkyl, laurylhexadecyl, stearyl, octyl, nonyl, oleyl, and the like.

In addition, examples of monobasic acids used for -liao acid addition tombs include #X#, formic acid, acetic acid, and nitric acid, and the salts are a combination of amine and acid, and are commercially available products manufactured by Kao Corporation. Examples include triamine R-86 and triamine R-82.

In addition, compounds with structures similar to the compounds of the present invention,
RN)1(C)1-C)12J)I(CH-C)I
f) J) 12, CH, C) l.

Or RNl((C12NH(CI-12)2N)+
2 and the like also have the same effects as the compounds of the present invention.

When the marine biofouling inhibitor of the present invention is used in a seawater cooling water system, water or a monohydric alcohol such as methyl alcohol, ethyl alcohol, n-propyl alcohol, or isopropyl alcohol should be used so that it is uniformly dissolved and dispersed in seawater. or polyhydric alcohols such as glycerin, propylene glycol, ethylene glycol, tosomeethylene glycol, guttukol ethers such as ethyl cellosolve, methyl cellosolve, butyl cellosolve, or various solvents such as acetone and dimethyl formamide. used. Furthermore, a surfactant may be added if necessary.

In addition, since this marine organism adhesion inhibitor has foaming properties, an antifoaming agent is added to the composition, or if foaming occurs in a waterway, it is directly applied to the location.

(Example) A test plant with a test piece (cedar board) placed in a waterway made of polyvinyl chloride + [10 x 1 [10 m5 square, length 2.5 cm] was used, and seawater was passed through it. Seawater flow rate 7 .5m'/
The composition of the present invention was injected using a metering pump at a flow rate of 0.35 .mu./hr. The amount of marine sessile organisms over 30 days was compared to a blank.

The composition and amount added of the marine organism adhesion inhibitor of the present invention are listed in Table 1 along with the results.

Table The symbols listed in the column for Bryozoans and hydrobugs in Table 1 above are symbols that serve as a guideline for the amount of adhesion by visual observation.If the blank ÷← is 100, it is 25, and - This shows that they have not done so.

As is clear from Table 1 above, the marine organism adhesion inhibitor of the present invention exhibits a remarkable effect in inhibiting the adhesion of marine organisms such as mussels and Fujitbo.

<Effects of the Invention> As explained above, the marine organism adhesion inhibitor of the present invention has the following effects:
When injected into a seawater cooling water system, it has the effect of suppressing the adhesion of marine organisms.

Therefore, it is possible to remove attached marine organisms without stopping the operation of the marine structure, which is advantageous in terms of time and economy compared to conventional cleaning methods.

Furthermore, the addition of the marine organism adhesion inhibitor of the present invention to seawater is extremely simple, as it is simply a matter of mixing a fixed amount.

Claims (1)

[Claims] General formula RNH(CH_2)_3NH(CH_2)_3NH_2
[In the formula, R is a saturated or unsaturated linear or side chain hydrocarbon group having 9 to 22 carbon atoms. ] A marine organism adhesion inhibitor containing one or more N-monosubstituted ditrimethylene triamines or monobasic acid addition salts thereof as an active ingredient.