KR20030004737A - Multi-functional one-component type cooling water treatment agent and method for water treatment using the same - Google Patents

Abstract

PURPOSE: A multifunctional one-component type cooling water treatment agent and method for water treatment using the same is provided, which has sustained sterilizing activity so that has an excellent sterilizing effect to all kinds of microorganisms in the open circulating cooling water system, and also can prevent both of the anodic reaction and cathodic reaction of corrosion reaction so that can inhibit corrosion condition occurring at metal surface thus exhibiting excellent corrosion inhibiting effects. CONSTITUTION: The multifunctional one-component type cooling water treatment agent comprises (a) 3-isothiazolinone represented by formula I, wherein R is hydrogen or chlorine; (b) an acrylate polymer represented by formula II, wherein l, m and n can be the same or different, and each are an integer of 1 to 1000 respectively; R is hydrogen, methyl or carboxyl and when R is carboxyl, it forms anhydrous ring by reaction with adjacent carboxyl; R1 and R8 can be the same or different, and each are hydrogen, alkyl, hydroxy or phosphono radical respectively; R2 and R3 can be the same or different, and each are hydrogen or C1 to C2 alkyl respectively; R4 is hydrogen or C1 to C5 alkyl; R5 is C1 to C8 alkyl or C1 to C10 aralkyl; X and Y can be the same or different, and each are hydrogen, C1 to C5 alkyl or C1 to C5 hydroxy alkyl respectively; and R0 is more than one selected from the group consisting of formula III, IV and V; (c) a phosphonate compound; (d) an iodate; (e) a zinc salt, orthophosphate, azole compound or their mixtures; and (f) water.

Description

TECHNICAL FIELD [0001] The present invention relates to a multifunctional one-pack type cooling water treating composition and a water treatment method using the same. [0002]

The present invention relates to a multifunctional one-component cooling water treatment composition and a water treatment method using the same, and more particularly to a multifunctional one-component cooling water treatment composition capable of simultaneously suppressing corrosion, scale and microbial slime formation that can occur in an open- The present invention relates to a cooling water treatment composition having excellent stability even during storage or use of the water, and a water treatment method using the same.

In the open circulation cooling system, the temperature of the cooling water is controlled using a device called a cooling tower. The system using the cooling tower is called the open circulation cooling system because the air always flows in. In the process of reusing the cooling water, various minerals contained in the water are concentrated through the evaporation of the water, . These various results are summarized as follows. In open circulating cooling system, three problems are caused by corrosion, scale and microorganisms.

First, corrosion can easily be described as a rust in a metal material. In general, the metal material is an oxide, which is a material made through a process called liquefaction, and thus has a property of returning to a thermodynamically stable oxide state. It is therefore quite natural that corrosion occurs in an open circulating cooling system.

The scale is formed by the combination of corrosion of sediments and other inorganic substances or various bivalent metal ions present in the water with anionic chemical substances on the metal surface. In general, the scale phenomenon is a phenomenon in which the solubility of metal salts And in the open circulation cooling system, it easily occurs at a high temperature due to heat load like a refrigerator or a heat exchanger. If the scale is too large, the piping becomes clogged and the heat transfer efficiency becomes low, which can waste process control defects and unnecessary energy.

In addition, microorganisms such as bacteria, fungi, and lichens may or may not live well depending on changes in the surrounding environment. Unfortu- nately, the environment of the cooling tower has very good conditions for the microorganisms to live in if you look at the surrounding environment such as water temperature, pH, dissolved oxygen, minerals and sunlight. If the microorganisms are entangled with each other and attached to the filling material of the cooling tower, the flow of water and air will be interrupted and the cooling efficiency will be lowered. The microbial mass attached to the cooling tower filler is called 'slime'. When the microbial slime is attached to the surface of the metal pipe, local corrosion such as microbial corrosion or bottom corrosion may occur.

In fact, corrosion, scale and microbial slime can be easily found in various industrial facilities using water piping as well as heat exchangers installed in industrial sites. In this case, it is possible to shorten the life of the cooling circulation system, reduce the heat transfer efficiency, Infection caused by bacteria, environmental pollution, and the like, resulting in enormous economic loss.

Various water treatment agents have conventionally been developed to overcome such problems. However, conventionally widely used cooling water treatment programs are used to treat cooling water by separately injecting a corrosion inhibitor, an anti-scale agent and an anti-microbial agent, It is impossible to solve all problems related to corrosion, scale and microorganisms. U.S. Patent No. 4,108,790 describes water treatment compositions using polymeric phosphates and gluconates. U.S. Patent No. 4,324,684 describes water treatment compositions using chromium salts, and US Pat. Patent No. 4,530,955 discloses a water treatment composition using lignin and tannin. U.S. Patent No. 5,227,133 discloses a cooling water treatment technique based on the composition of zinc salt, molybdate, and phosphate. U.S. Patent No. 5,156,665 discloses a microorganism- Treatment techniques have been reported.

However, as mentioned above, the water treatment agent composition having the corrosion and scale prevention function has a weak microorganism preventing function, and the microorganism preventing composition can not expect the corrosion and scale prevention function. Therefore, the use thereof is limited. In order to manage the cooling water, There is a problem in that the water treatment agent must be appropriately added according to the amount of the water, and in particular, the use of chromium salt is regulated due to various problems such as pollution induction and human toxicity.

In addition, the corrosion inhibitor, the anti-scale agent and the anti-microbial agent have been separately developed by the conventional cooling water treatment method. However, when they are mixed into one product, compatibility with each other is insufficient to form a precipitate, The stability of the product is deteriorated, and the effect of each compound can not be exerted smoothly.

DISCLOSURE OF THE INVENTION It is an object of the present invention to provide a multifunctional one-component cooling water treating composition capable of simultaneously solving problems of corrosion, scale and microbial slime in an open circulation cooling system, taking into consideration the problems in the prior art.

Another object of the present invention is to provide a cooling water treatment composition which is more convenient to use, has excellent compatibility with each other, and has excellent stability in storage and use of a product.

Another object of the present invention is to provide a water treatment method using the cooling water treating composition.

To achieve these and other advantages and in accordance with the purpose of the present invention,

a) 3-isothiazolinone represented by the following formula (1);

b) an acrylate-based polymer represented by the following formula (2);

c) phosphonate compounds;

d) Iodic acid salt;

e) zinc salts, phosphates, carboxylate compounds, azole compounds or combinations thereof

; And

f) Water

Functional water-treating agent composition comprising:

[Chemical Formula 1]

In the above formula (1), R is hydrogen or chlorine,

(2)

In Formula 2,

l, m and n may be the same or different and are each independently an integer of 1 to 1,000 ; R is hydrogen, methyl or carboxy, and when R is a carboxy group, it combines with an adjacent carboxy group to form an anhydrous ring; R ₁ and R ₈ may be the same or different and are each independently hydrogen, an alkyl group, a hydroxyl group or a phosphono group; R ₂ and R ₃ may be the same or different and are each independently hydrogen or a C ₁ -C ₂ alkyl group; R ₄ is hydrogen or a C ₁ -C ₅ alkyl group; R ₅ is a C ₁ -C ₈ alkyl group or a C ₈ -C ₁₀ aralkyl group; X and Y may be the same or different, respectively, and each independently hydrogen, C ₁ -C ₅ alkyl or C ₁ -C ₅ hydroxy alkyl group of; And R < ₀ > are at least one selected from the group consisting of compounds represented by the following formulas (3), (4)

(3)

[Chemical Formula 4]

[Chemical Formula 5]

In the formulas (3) to (5)

R ₆ and R ₁₂ may be the same or different and are each independently hydrogen or a C ₁ -C ₂ alkyl group; R ₁₃ and R ₁₄ may be the same or different and are each independently hydrogen, a C ₁ -C ₈ alkyl group, a C ₆ -C ₈ cycloalkyl group, a benzyl group, or a compound of the following formula 6; And R ₇ is a C ₁ -C ₆ alkyl group, a C ₆ -C ₁₀ allyl group, a C ₆ -C ₁₀ aralkyl group, or a compound of the following formula 6:

[Chemical Formula 6]

In Formula 6,

i is 1, 2 or 3; R ₉ is hydrogen or a C ₁ -C ₂ alkyl group; R ₁₀ is hydrogen or a C ₁ -C ₆ alkyl group.

Preferably, the water treatment composition of the present invention comprises a) a) 3-isothiazolinone represented by the above formula (1); b) an acrylate-based polymer represented by Formula 2; c) phosphonate compounds; d) Iodic acid salt; And e) 1 to 90% by weight of a composition comprising a zinc salt, a citric acid salt, a carboxylate compound, an azole compound, or a mixture thereof; And b) from 10 to 99% by weight of water,

(A) 100 parts by weight of 3-isothiazolinone represented by the formula (1); b) 100 to 12000 parts by weight of an acrylate-based polymer represented by the general formula (2); c) from 100 to 12000 parts by weight of a phosphonate compound; d) 100 to 3200 parts by weight of iodate; And e) from 100 to 8000 parts by weight of a zinc salt, from 100 to 10000 parts by weight of a phosphoric acid salt, from 100 to 12,000 parts by weight of a carboxylate compound, from 1 to 2000 parts by weight of an azole compound, or a mixture thereof.

In addition, the present invention provides a water treatment method for introducing the multifunctional one-component water treatment composition of the present invention into a cooling water system.

Hereinafter, the present invention will be described in detail.

The inventors of the present invention have conducted continuous research to solve the problems of the prior art. As a result, the present inventors have found that a cooling tower water treatment agent which is excellent in stability during storage and use and solves corrosion, scale and microbial slime problems simultaneously in an open circulating cooling system Thereby developing a composition.

In the cooling water treating composition of the present invention, a microorganism growth inhibitor is a microorganism which is excellent in germicidal effect against all microorganisms in an open circulation cooling system by a sterilization sustaining force using 3-isothiazolinone represented by the above formula (1) It has the function of preventing both the anode reaction and the cathode reaction during the corrosion reaction, so that the corrosive condition that may occur on the metal surface can be minimized and an excellent corrosion prevention effect can be expected. Particularly, 3-isothiazolinone of the above formula (1) is preferably 2-methyl-4-isothiazolone-3-one in which R is hydrogen, or 5-chloro-2-methyl-4-isothiazolone- Methyl-4-isothiazolone-3-one and 5-chloro-2-methyl-4-isothiazolone-3-one are preferably used in a ratio of 1:20 to 20: 1 Based on the total weight of the mixture.

In the present invention, b) an acrylate-based polymer represented by the above-mentioned formula (2) is used as an inhibitor of scale formation, and exhibits very excellent properties for the scale inhibition effect of a divalent metal salt. The amount of the acrylate polymer used is 100 to 12000 parts by weight based on 100 parts by weight of 3-isothiazolinone, which is a microbial growth inhibitor. At this time, if the use amount is out of the above range, the microorganism inhibition efficiency may be lowered, and the scale inhibition effect is good but not economical.

Further, in the present invention, c) a phosphonate compound is used to change the crystal structure of the divalent metal salt to inhibit scale formation and to prevent corrosion of the metal. The phosphonate compound is preferably an organophosphate ion, and examples thereof include phosphonobutane tricarboxylic acid, hydroxyethylidene diphosphonic acid, hydroxyphosphonocarboxylic acid, aminotrimethylenephosphonic acid, And ethylene diamine tetramethylidene phosphonic acid. The amount of the phosphonate compound used is 100 to 12000 parts by weight based on 100 parts by weight of 3-isothiazolinone, which is a microbial growth inhibitor, based on the concentration of the organophosphate ion. If the amount is outside the above range, the microbial control efficiency may be lowered, and the corrosion and scale inhibiting effect is good, but it is not economical and it may hinder long-term product storage stability.

In the cooling water treatment composition of the present invention, d) iodic acid salt is used as a stabilizer for improving the storage stability of the product. The iodic acid salt is preferably iodic acid potassium salt or sodium iodic acid sodium salt. The amount of the iodate salt used is 4 to 400 parts by weight based on the iodide ion concentration based on 100 parts by weight of 3-isothiazolinone, which is a microbial growth inhibitor. At this time, if the use amount is out of the above range, the storage stability effect is not good and economical when the product is stored.

In addition, in the cooling water treating composition of the present invention, e) a zinc salt, a polyphosphate, a carboxylate compound, an azole-based compound, or a mixture thereof in order to increase mutual compatibility and corrosion prevention performance between the components .

As the zinc salt used herein, zinc chloride, zinc sulfate, zinc nitrate, etc. may be used alone or in admixture of one or more. As the above-mentioned phospho-phosphate, a primary phosphate, a secondary phosphate, a tertiary phosphate or a phosphoric acid may be used singly or in combination, and it is particularly preferable to use phosphoric acid. The carboxylate compound preferably includes at least one kind selected from the group consisting of carboxylate compounds having 3 to 12 carbon atoms. As the azole compound, at least one compound selected from the group consisting of benzotriazole, tolyltriazole, and mercaptobenzothiazole can be used, and it is particularly preferable to use benzotriazole.

In the present invention, when a zinc salt is included, a quick-acting coating is formed on the surface of a metal to improve the corrosion-preventing ability. The zinc salt is used in an amount of 100 to 8000 parts by weight based on the zinc ion concentration with respect to 100 parts by weight of the 3-isothiazolinone. At this time, if the use amount is out of the above range, the corrosion prevention effect is good, but it is not economical and a scale composed of zinc salt can be generated.

In addition, when a phosphoric acid salt is included, a bi-polar layer is formed on the surface of the metal to improve corrosion resistance. 100 to 10000 parts by weight, based on 100 parts by weight of the 3-isothiazolinone of the above-mentioned polyphosphate, based on the concentration of orthophosphate ions. If the amount of the used phosphoric acid salt is out of the above range, the microbial inhibition efficiency may be lowered. The effect is good, but not economical, and can produce phosphate salt scales in which divalent metal ions and orthophosphate ions are combined.

In addition, when a carboxylate compound is included, the corrosion inhibiting ability is improved by inhibiting the positive electrode reaction during the corrosion reaction. The amount of the carboxylate compound to be used is 100 to 12000 parts by weight based on 100 parts by weight of the 3-isothiazolinone. If the amount of the carboxylate compound is outside the above range, the microorganism inhibition efficiency may be lowered. Which can impair storage stability.

In addition, when an azole-based compound is included, it improves corrosion resistance against copper and copper alloy among various metals. The azole compound is used in an amount of 1 to 2,000 parts by weight based on 100 parts by weight of the 3-isothiazolinone. At this time, when the use amount is out of the above range, the corrosion preventing ability against copper and copper alloy can be improved, but it is not economical and the storage stability of the product may be deteriorated.

In the present invention, in addition to the above-mentioned composition components, f) water can be further added to adjust the total weight ratio, and it is preferable to use 10 to 99% by weight, more preferably 60 to 80% by weight based on the total amount . It is more preferable to use pure water or distilled water which does not contain ions.

Accordingly, the multifunctional one-pack type water treatment composition of the present invention comprises 1) to 90% by weight of the composition consisting of the above composition components, and b) 10 to 99% by weight of water.

Meanwhile, the present invention provides a water treatment method for injecting a multi-functional one-pack type cooling water treating composition having the above composition and content into a cooling water system.

At this time, in the cooling water system, the cooling water treating composition is preferably used in a concentration of 1 to 500,000 ppm, more preferably 5 to 250,000 ppm, in water such as cooling water to be treated.

The cooling water treating composition of the present invention can be used more effectively to prevent corrosion that may occur in various industrial water pipes and to suppress scale and microbial growth, so that an open circulation cooling system and a super cooling system can be used. Among them, it is more preferable to use it as a water treatment agent for an open circulation cooling system in which corrosion or scale tendency is high and microbial problems are severe.

Hereinafter, the present invention will be described in detail based on examples. However, the present invention is not limited to these examples.

[Examples 1 to 10 and Comparative Examples 1 to 5]

The contents of the active ingredients in the test water were dissolved in the test water of Tables 3, 5 and 7 so as to be described in the following Table 1 (Examples 1 to 10) and Table 2 (Comparative Examples 1 to 5).

The concentration of each component in the water treatment program in which the cooling water treating agent composition was dissolved division Example One 2 3 4 5 6 7 8 9 10 Composition Component (ppm) Isothiazolinone 1.5 2.0 2.5 1.5 2.0 2.5 1.5 2.5 1.5 2.5 Acrylate-based polymer 5 7.5 10 5 7.5 10 5 10 5 10 Phosphonate compound 3 5.5 8 3 5.5 8 3 8 5.5 8 Iodic acid salt 0.08 0.1 0.1 0.15 0.15 0.15 0.1 0.1 0.1 0.1 Zinc salt 2 2.5 3 0 0 0 0 0 0 2.5 Citrate 0 0 0 4 8 12 0 0 0 4 Carboxylate compound 0 0 0 0 0 0 5 10 20 10 Azole-based compound 0 0 0 0 0 0 0 0.5 0 1.0

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Composition Component (ppm) Isothiazolinone 0 1.5 0 0 0 Acrylate-based polymer 0 0 10 0 0 Phosphonate compound 0 0 0 0 5 Iodic acid salt 0 5.5 0 0 0 Zinc salt 0 0 0 2 0 Citrate 0 0 0 4 0 Carboxylate compound 0 0 0 0 5 Azole-based compound 0 0 0 0 1.0

In the above Tables 1 and 2, isothiazolinone was obtained by using SKYBIO WG (2-methyl-4-isothiazolone-3-one: 5-chloro-2-methyl-4-isothiazolone- 3-one in a weight ratio of 1: 3) was used, and the amount of use was expressed in terms of the concentration of the isothiazolinone compound. The acrylate polymer used was Belclene 400 (a product containing 50% of an acrylate copolymer), which is a product of BIOLAB, the amount of which is expressed in terms of the concentration of the acrylate copolymer. Hydroxyethylidene diphosphonic acid [HEDP (LONZA)] was used as the phosphonate compound, and the amount of the phosphonate compound was expressed in terms of the concentration of the organic phosphate. The iodic acid salt used was iodic acid potasium salt, and the amount thereof was indicated based on the concentration of the iodic acid potasium salt. Zinc chloride was used as zinc chloride, and the amount of zinc used was expressed in terms of zinc ion concentration. Phosphoric acid was used as the citrate phosphate, and the amount of citrate was expressed based on the ion concentration of orthophosphate. The carboxylate compound used was citric acid, and the amount of citric acid was expressed based on the concentration of citric acid. The azole-based compound used was benzotriazole, which was expressed based on the concentration of benzotriazolic acid.

[Experimental Example]

Examples 1 to 10 and Comparative Examples 1 to 5 were subjected to a corrosion inhibition test, a scale formation inhibition test, and a microbial growth inhibition test as described below.

end. Corrosion test

Corrosion tests were carried out using a rotating corrosion tester. Carbon steel specimens were rotated at a rotation speed of 170 rpm under the condition of air temperature of 30 ° C and 10 cc / min to measure the corrosion rate of carbon steel. At this time, the test water of the following Table 3 was immersed for 5 days in each of the concentrations of the cooling water treating agent components in Examples 1 to 10 and Comparative Examples 1 to 5, and the corrosion rate [mdd, mg / (dm < 2 > .day)] were measured, and the results are shown in Table 4 below.

Test water quality used in the corrosion test division Water quality # One # 2 # 3 PH 7.5 to 8.0 Calcium Hardness (ppm) 100 300 500 M-Alkalinity (ppm) 80 100 120 Overall Diameter (ppm) 120 360 600 Chloride ion (ppm) 80 240 400

In Table 3, the pH was adjusted with 0.1 N aqueous sodium hydroxide solution and 0.05 N aqueous sulfuric acid solution. Calcium hardness was controlled with calcium chloride and M-alkalinity was controlled with sodium bicarbonate. Also, the total diameter was composed of the sum of calcium hardness and magnesium hardness. The magnesium hardness was controlled by magnesium sulfate and the chloride ion was controlled by sodium chloride.

Corrosion test result division Corrosion Result (mdd; mg / (dm ㆍ day)) Water quality # 1 Water quality # 2 Water quality # 3 Example 1 1.48 2.04 2.12 Example 2 1.24 1.40 1.63 Example 3 1.24 1.36 1.44 Example 4 1.42 1.82 2.43 Example 5 1.32 1.44 1.50 Example 6 1.26 1.36 1.42 Example 7 3.05 5.28 7.54 Example 8 1.06 3.52 4.28 Example 9 1.21 5.08 6.34 Example 10 0.64 0.72 0.68 Comparative Example 1 284.31 195.21 159.58 Comparative Example 2 296.54 205.36 172.05 Comparative Example 3 265.28 174.28 136.45 Comparative Example 4 13.58 15.26 12.27 Comparative Example 5 26.38 29.24 36.08

As can be seen from Table 4, the corrosion inhibiting effect of Examples 1 to 10 is much better than those of Comparative Examples 1 to 5, so that the multifunctional cooling water treating composition of the present invention is excellent in corrosion prevention effect .

I. Scale formation inhibition test

After the test solution was sealed and stood at 70 ° C for 24 hours, the test solution was filtered with a 0.45 micrometer filter, and the scale inhibition rate was measured by measuring the total diameter at this time. The test water quality is as shown in Table 5, and in each of the test water samples, the concentrations of the components of the cooling water treating agent were tested and tested for Examples 1 to 10 and Comparative Examples 1 to 5. The scale inhibition rate was calculated by the following equation (1) and the results are shown in Table 6 below.

[Equation 1]

In the above equation (1), Ct is the total diameter of the test liquid before the test, and Ce is the total diameter of the test liquid after the test.

Test water quality used in the scale inhibition test division Water quality # One # 2 # 3 Calcium Hardness (ppm) 100 300 500 M-Alkalinity (ppm) 100 300 500 Chloride ion (ppm) 80 240 400

In Table 5, calcium hardness of each test water was controlled by calcium chloride, M-alkalinity was adjusted to sodium bicarbonate, and chloride ion was adjusted to sodium chloride.

Scale inhibition test result division Scale inhibition rate (%) Water quality # 1 Water quality # 2 Water quality # 3 Example 1 100 100 98 Example 2 100 100 98 Example 3 100 100 100 Example 4 98 97 98 Example 5 98 97 94 Example 6 98 94 92 Example 7 100 100 100 Example 8 100 100 100 Example 9 100 100 100 Example 10 100 100 96 Comparative Example 1 88 33 28 Comparative Example 2 86 30 25 Comparative Example 3 96 90 86 Comparative Example 4 78 27 24 Comparative Example 5 96 92 86

As can be seen from Table 6, the scale inhibition rates of Examples 1 to 10 are 92 to 100%, which is far superior to those of Comparative Examples 1 to 5.

All. Microbial growth inhibition test

( Enterobacter aerogenes ATCC 13048, Escherichia coli ATCC 11229, Micrococcus luteus ATCC 9341, Pseudomonas aeruginosa ATCC 15442, Klebsiella pneumoniae ATCC 1560, Staphylococcus edidermis ATCC 155, and the like) under air injection conditions of 30 rpm, 170 rpm and 10 ml / Staphylococcus aureus ATCC 6538, and Bacillus subtilis ATCC 6984 ) was injected into the test tube to measure the decrease in the concentration of the microorganism after 2 days. At this time, the microorganism mixture was prepared to 10 ⁶ CFU / ml (Colony forming unit / ml), and then the concentration of the microorganism was added to the test water of the following Table 7 to 10 ⁵ CFU / ml. The water treatment compositions of Examples 1 to 5 were tested for inhibition of microbial growth after maintaining the concentration of each component, and the results of microbial reduction are shown in Table 8 below.

Test water quality used in the microbial growth inhibition test division Water quality # One # 2 # 3 PH 7.5 to 8.0 Calcium Hardness (ppm) 100 300 500 M-Alkalinity (ppm) 80 100 120 Overall Diameter (ppm) 120 360 600 Chloride ion (ppm) 80 240 400 Initial microbial counts (CFU / ml) 10 ⁵ 10 ⁵ 10 ⁵

Microbial Growth Inhibition Test Results division Number of microorganisms (CFC / ml = Colony Forming Unit / ml) Water quality # 1 Water quality # 2 Water quality # 3 Example 1 10 ¹ 10 ¹ 10 ¹ Example 2 0 0 10 ¹ Example 3 0 0 0 Example 4 10 ¹ 10 ¹ 10 ¹ Example 5 0 10 ¹ 10 ¹ Example 6 0 0 0 Example 7 10 ¹ 10 ¹ 10 ¹ Example 8 0 0 0 Example 9 10 ¹ 10 ¹ 10 ¹ Example 10 0 0 10 ¹ Comparative Example 1 10 ⁶ 10 ⁷ 10 ⁷ Comparative Example 2 10 ¹ 10 ¹ 10 ² Comparative Example 3 10 ⁷ 10 ⁷ 10 ⁷ Comparative Example 4 10 ⁷ 10 ⁷ 10 ⁸ Comparative Example 5 10 ⁶ 10 ⁷ 10 ⁷

As can be seen from Table 8, when the cooling water treating composition of Examples 1 to 10 according to the present invention was used, the microorganism growth inhibition function was significantly higher than those of Comparative Examples 1 to 5, 8 showed complete inhibition of microbial growth.

The cooling water treating composition for an open circulation cooling system according to the present invention has excellent corrosion resistance, scaling prevention function and microbicidal effect synergistically, there was.

As described above, the water treatment composition of the present invention has a sterilizing persistence capability and is excellent in bactericidal effect against all microorganisms in an open circulation cooling system and has a function of preventing both an anodic reaction and an anodic reaction during a corrosion reaction, It is possible to reduce the corrosion conditions that may occur on the surface to the greatest extent, thereby achieving an excellent corrosion prevention effect.

In addition, since the crystal structure of the divalent metal salt scale is changed and the scale is suppressed, problems related to corrosion, scale and microorganisms can be solved at the same time.

Claims (11)

a) 3-isothiazolinone represented by the following formula (1); b) an acrylate-based polymer represented by the following formula (2); c) phosphonate compounds; d) Iodic acid salt; e) zinc salts, phosphates, carboxylate compounds, azole compounds or combinations thereof ; And f) Water A multi-functional one-component water treatment composition comprising: [Chemical Formula 1] In the above formula (1), R is hydrogen or chlorine, (2) In formula (2), l, m and n may be the same or different and are each independently an integer of 1 to 1,000; R is hydrogen, methyl or carboxy, and when R is a carboxy group, it combines with an adjacent carboxy group to form an anhydrous ring; R ₁ and R ₈ may be the same or different and are each independently hydrogen, an alkyl group, a hydroxyl group or a phosphono group; R ₂ and R ₃ may be the same or different and are each independently hydrogen or a C ₁ -C ₂ alkyl group; R ₄ is hydrogen or a C ₁ -C ₅ alkyl group; R ₅ is a C ₁ -C ₈ alkyl group or a C ₈ -C ₁₀ aralkyl group; X and Y may be the same or different, respectively, and each independently hydrogen, C ₁ -C ₅ alkyl or C ₁ -C ₅ hydroxy alkyl group of; And R < ₀ > are at least one compound selected from the group consisting of the following formulas (3), (4) (3) [Chemical Formula 4] [Chemical Formula 5] In the formulas (3) to (5), R ₆ and R ₁₂ may be the same or different and are each independently hydrogen or a C ₁ -C ₂ alkyl group; R ₁₃ and R ₁₄ may be the same or different and are each independently hydrogen, a C ₁ -C ₈ alkyl group, a C ₆ -C ₈ cycloalkyl group, a benzyl group, or a compound of the following formula 6; And R ₇ is a C ₁ -C ₆ alkyl group, a C ₆ -C ₁₀ allyl group, a C ₆ -C ₁₀ aralkyl group, or a compound of the following formula 6: [Chemical Formula 6] In Formula 6, i is 1, 2 or 3; R ₉ is hydrogen or a C ₁ -C ₂ alkyl group; R ₁₀ is hydrogen or a C ₁ -C ₆ alkyl group. The method according to claim 1, The multi-functional one-component water treatment composition A) a) 3-isothiazolinone represented by the above formula (1); b) an acrylate-based polymer represented by Formula 2; c) phosphonate compounds; d) Iodic acid salt; And e) zinc salts, orthophosphates, carboxylate compounds, azole compounds, or These mixtures 1 to 90% by weight of a composition comprising; And B) from 10 to 99% by weight of water, The above a) composition a) 100 parts by weight of 3-isothiazolinone represented by the above formula (1); b) an acrylate-based polymer represented by the formula (2) Weight part; c) from 100 to 12000 parts by weight of a phosphonate compound; d) 100 to 3200 parts by weight of iodate; And e) 100 to 8000 parts by weight of zinc salt, 100 to 10000 parts by weight of orthophosphoric acid, 100 to 12,000 parts by weight of a compound of a chelate compound, 2000 parts by weight, or a mixture thereof Wherein the water-treating agent is a water-soluble organic solvent. The method according to claim 1, The 3-isothiazolidinone of a) above is prepared by reacting 2-methyl-4-isothiazolone-3-one and 5-chloro-2- By weight based on the total weight of the composition. The method according to claim 1, Wherein the phosphonate compound of c) is at least one selected from the group consisting of phosphonobutane tricarboxylic acid, hydroxyethylidene diphosphonic acid, hydroxyphosphonocarboxylic acid, aminotrimethylenephosphonic acid, and ethylenediamine tetramethylidenephosphonic acid ≪ RTI ID = 0.0 > 1, < / RTI > The method according to claim 1, Wherein the iodic acid salt of d) is an iodic acid potasium salt or an iodic acid sodium salt. The method according to claim 1, The zinc salt of e) above is selected from the group consisting of zinc chloride, zinc sulfate, and zinc nitrate. The method according to claim 1, Wherein the citric acid salt of e) is selected from the group consisting of phosphoric acid, primary phosphate, secondary phosphate and tertiary phosphate. The method according to claim 1, Wherein the carboxylate compound of e) comprises at least one kind selected from the group consisting of carboxylate compounds having 3 to 12 carbon atoms. The method according to claim 1, Wherein the azole compound in e) is selected from the group consisting of benzotriazole, tolyltriazole, and mercaptobenzothiazole. A water treatment method, characterized in that the multifunctional one-component water treatment composition according to any one of claims 1 to 9 is put into a cooling water system. 11. The method of claim 10, Wherein the concentration of the water treatment composition in the cooling water system is 1 to 500,000 ppm.