JPH0959108A - Algaecide for adding to water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a durable algaecide used by adding to water, exhibiting the excellent activity in a wide pH range, not affecting environments, excellent in the algaecidal effect and the alga multiplication-inhibiting effect and low in toxicity at a low cost by using a specific amine compound. SOLUTION: An ethylene oxide-added amine compound of the formula (R is a 1-18C alkyl, aryl, aralkyl; (m), (n) are 0-8 which are the mole number of the added ethylene oxide, wherein m+n=1 to 8) is used. The amine compound of the formula includes oxyethylene methylamine, oxyethylene ethylamine, and oxyethylene butylamine. One or more of the amine compounds of the formula may be used in the algaecide. The algaecide is suitably added to water in such an amount that the concentration of the amine compound of the formula is approximately 1-500ppm. Algae to be effectively killed or controlled in their multiplication with the algaecide is e.g. chlorella, hormidium, anabaena or navicula.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an algaecide which is used by being added to cooling water for general air conditioning or industrial use and water for various other purposes.

[0002]

[Technical background] Heat exchangers for cooling water such as cooling towers for industrial use, routes for circulating these cooling water (pipes,
(Pumps, strainers, valves, etc.), water storage tanks for various purposes, swimming pools, etc. Algae adhere and propagate, leading to harmful effects such as corrosion of equipment and pipes, deterioration of cooling efficiency, generation of bad odor, and deterioration of appearance.

In order to eliminate algae that cause such harmful effects, conventionally, chlorine-based bactericides such as sodium hypochlorite, calcium hypochlorite, bleaching powder, and cyanuric acid chloride are added to the above-mentioned various types. Additions to water have been made.
These bactericides generate hypochlorous acid in water, which is the main bactericidal effect and exhibits a rapid effect.

However, all of the above-mentioned bactericides have poor sustainability and are effective only in a limited pH range in addition to being consumed by organic substances and ammonium. In addition, there is a concern that the environment will be adversely affected when the water containing these fungicides is discarded outside the system.

Further, as an algicidal agent which does not have such a problem, one containing glutaraldehyde and a quaternary ammonium salt (JP-A-62-96401), a 3-isothiazolone compound or a metal salt thereof and a molecular weight of 1 are used. , 000-7
A compound comprising a polyamine sulfonic acid derivative of 0,000 (Japanese Patent Publication No. 7-59483) has also been proposed.

[0006]

OBJECT OF THE INVENTION The present invention does not have the above-mentioned problems, that is, has a long-lasting effect, exhibits an excellent effect in a wide pH range, has no adverse effect on the environment, and has an algicidal effect and a reproduction suppressing effect. It is an object of the present invention to provide an algaecide for water addition, which has excellent composition, low toxicity, and a composition different from that of the above-mentioned prior proposal at low cost.

[0007]

SUMMARY OF THE INVENTION The algicidal agent of the present invention comprises an ethylene oxide adduct amine compound having the following general formula.

[0008]

Embedded image

In the amine compound having the above general formula, R is an alkyl group, aryl group or aralkyl group having 1 to 18 carbon atoms, preferably about 6 to 12 carbon atoms.

R may have a carbon number of 1 or more, but from the viewpoint of the algicidal effect, it is preferable that R has a relatively large number of carbon atoms. However, if the carbon number is too large, there are concerns about problems such as solubility and the effect on the environment when discarded outside the system. Therefore, the upper limit of the carbon number is 18, and the preferable carbon number is about 6 to 12.

Specific examples of the above alkyl group include methyl, ethyl, propyl, isopropyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl,
Undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, and the like, specific examples of the aryl group include phenyl, tolyl, xylyl, and the like, and specific examples of the aralkyl group include benzyl and phenyl. Examples thereof include ethyl, methylbenzyl, naphthylmethyl and the like.

The number of ethylene oxide groups (-C ₂ H ₄ O-) bonded to nitrogen, specifically the number of moles of ethylene oxide added, m and n are 0 to 8 and m + n = 1. It is necessary to satisfy the two conditions of ~ 8 at the same time. m,
If n is larger than 8, the cost will be high, the algicidal effect will be reduced, and there is a concern that the environment will be adversely affected when it is discarded outside the system.

Further, either of m and n may be 0, but the sum of m and n is within the range of 1 to 8, that is, --C ₂ H ₄ O-- group is the above-mentioned general one. It is important that 1 mol is bound to 1 molecule of the ethylene oxide-added amine compound of the present invention represented by the formula.

Specific examples of the ethylene oxide-added amine compound (hereinafter abbreviated as amine compound) in the present invention include the following compounds, but the compounds are not limited as long as they satisfy the above general formula. Any amine compound may be used. Oxyethylene methylamine,
Oxyethyleneethylamine, oxyethylenebutylamine, oxyethylenehexylamine, oxyethyleneoctylamine, oxyethylenedodecylamine, oxyethylenephenylamine, oxyethylenebenzylamine, polyoxyethylenedodecylamine (2 mol addition product of ethylene oxide, 5 mol addition Compound, 7 mol adduct), polyoxyethylene octadecylamine (2 mol adduct of ethylene oxide, 4 mol adduct, 8 mol adduct) and the like.

The algicidal agent of the present invention may be used alone or in combination of two or more of the above amine compounds. Further, it can be used in combination with other algicidal agents or bactericidal agents, and the combined use with these does not cancel the algicidal action of the amine compound.

Further, the algicidal agent of the present invention can be used by blending additives such as a metal corrosion inhibitor and a scale dispersant.

The algicidal agent of the present invention comprising the above amine compound, and optionally other algicidal agents, bactericidal agents and the above-mentioned various additives, is dissolved in an appropriate solvent to be used as a liquid agent. Alternatively, it can be mixed with a water-soluble solid or fine powder to give a powder, or can be used as a tablet.

As the above solvent, water is preferable, but alcohols such as methanol and ethanol; ethylene glycol, propylene glycol, polyethylene glycol, diethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monomethyl ether. Glycols such as butyl ether;
Dimethyl sulfoxide, dimethylformamide, ethylene glycol diacetate, diethylene glycol monoethyl ether acetate and the like can be used alone or in admixture of two or more.

Examples of the water-soluble solid or fine powder used for forming the above-mentioned powders or tablets include inorganic salts such as sodium chloride, anhydrous Glauber's salt and magnesium sulfate; high molecular weight polyethylene glycols; sugars such as glucose and lactose; Etc. These may be mixed with the algaecide of the present invention in a kneader, a blender or the like and used as a powder, or may be tableted and used.

The algicidal agent of the present invention, which may be in the form of liquid, powder, tablet, or any other form, is used by adding it to the water for which algae is to be treated. The amount of the amine compound is somewhat different depending on the kind of the above amine compound and the use conditions and environment of water, but generally, the above amine compound has a concentration of about 1 to 500 ppm, preferably about 3 to 200 ppm. Such an amount is suitable.

When the above amine compound is contained in this amount, it effectively suppresses the growth of various algae in cooling water used for general air conditioning or various industries, and water for various other uses. Not only can it be carried out, but also algae killing can be carried out effectively.

The algae that is effectively killed or suppressed by the algicidal agent of the present invention is not particularly limited.
Chlorella, Holmium (H
ordium, Ulothrix
x) and other green algae; Anabaena, Oscillatoria, Phormidium and other cyanobacteria; Navicula, Synedr
a), diatoms such as Cymbella; and the like.

[0023]

【Example】

Test Example 1 In order to confirm the algicidal effect of the algicidal agent of the present invention, a test according to the following procedure was conducted.

[Test Procedure] 1. Algae under test Chlorella vulg
aris) (IAM: IAM Culture Col)
collection "IAM C-30" is used) 2. Preparation of Test Algae Solution The dead mel liquid medium shown in Table 1 (a medium having a 1/2 concentration was used) was poured into a 100 ml Sakaguchi flask and sterilized by an autoclave. This was inoculated with the above-mentioned test algae in an amount of 1 ase, shake-cultured at 25 ° C. for 10 days while irradiating with light of about 1,500 lux, and sufficiently grown to obtain a test algae solution.

[0025]

[Table 1]

3. Test method The above-mentioned test algae solution was dispensed into L-shaped test tubes sterilized by dry heat and sterilized by a cotton cloth in fixed amounts, and further, into the L-shaped test tubes.
Various amine compounds shown in Table 3 (commercial products of Table 2 are used, NO. 10 of Table 3 is a synthetic product of the present inventor, and others are commercially available reagents) are adjusted to various concentrations. Was used as a test solution. The test solution was irradiated with light of about 1500 lux while being shake-cultured at 25 ° C. and observed daily, and the concentration at which algae was white was determined to be effective.

[0027]

[Table 2]

In Table 2, * 1, * 4 to * 6 of the Nymeen series are trade names * 2, * 3, * manufactured by NOF CORPORATION.
Amate series No. 7 is a trade name manufactured by Kao Corporation. The number of moles of the —CH ₂ CH ₂ O— group added per molecule of the amine compound is “1” for * 1 and “2” for * 2.
(That is, m + n = 2), * 3 is “5”, * 4 is “7”, * 5 is “2”, * 6 is “4”, and * 7 is “8”.

[0029]

[Table 3]

Table 4 shows the above results.

[0031]

[Table 4]

The criteria in Table 4 are as follows. ++ Good growth of algae in the test solution. + ・ ・ ・ ・ The growth of algae in the test solution is weak. --- No growth of algae in the test solution is observed (whitening).

Example 1 The amine compound No. 1 in Test Example 1 above was used. One, two, one
0 was used for each, and an actual machine test was performed on cooling water for general air conditioning. The addition concentration of each amine compound is No. 1
And No. No. 10 is 10 ppm, No. 10 2 was set to 20 ppm, and each amine compound was added so that these concentrations would be obtained every week, and the algae generation state of the cooling tower was observed in the summer. As a result, after one month of use, no algae was found in any of the cooling towers using any of the amine compounds.

Example 2 The same amine compound No. 1 as in Example 1 was used. Using 1, 2, and 10 respectively, an actual machine test was conducted in an outdoor water tank. The addition concentration of each amine compound is No. 1 and No. 10
Is 100 ppm, No. 300p for 2
pm, and the algae generation status in the aquarium was observed in the summer. As a result, no algae was found in any of the aquariums that had been left for 1 month and which contained any amine compound.

[0035]

As described above, the algicidal agent of the present invention can be prepared by using the amine compound having the above general formula alone.
Cooling water, water circulation paths for various other purposes, sunlight such as storage tanks, and other areas located within the reach of light rays,
It is possible to effectively suppress the generation of algae.

Claims (1)

[Claims] 1. An algicidal agent for water addition comprising an ethylene oxide-added amine compound having the following general formula. Embedded image