Water treatment agent composition, and water treatment method

Abstract

To provide a water treatment agent composition comprising a nonionic surfactant and an azole compound packed in a single package, which is prevented from becoming opaque.SOLUTION: The water treatment agent composition includes water, a nonionic surfactant, an azole compound, and a polymer at least including an acrylamide group as a monomer unit.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a water treatment composition that can be used, for example, to inhibit corrosion in an aqueous system, and a water treatment method that uses the water treatment composition. [Background technology]

[0002] Water treatment chemicals used in water treatment contain various bactericides, scale inhibitors, corrosion inhibitors, etc. for the purpose of controlling biofouling, inhibiting scale, inhibiting corrosion, etc. In order to stably formulate these various components, surfactants are sometimes added.

[0003] For example, water treatment chemicals containing water, a nonionic surfactant, and an azole compound are known as cooling water treatment agents used in industrial water systems such as cooling water.

[0004] For example, Patent Document 1 discloses a water treatment agent composition containing water, a bromine-based oxidizing agent, a sulfamic acid compound, an azole compound, and at least one of a surfactant such as a nonionic surfactant, and an N-vinylpyrrolidone monomer-containing polymer.

[0005] When a nonionic surfactant and an azole compound are combined into a single agent, such as the water treatment composition of Patent Document 1, the solution may become cloudy immediately after mixing the components. In such cases, it is difficult to visually confirm whether the solid raw materials in the solution have completely dissolved. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Patent Application Publication No. 2017 / 187725 Brochure Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a water treatment composition which is a one-component water treatment composition containing a nonionic surfactant and an azole compound and which is inhibited from becoming cloudy, and a water treatment method which uses the water treatment composition. [Means for solving the problem]

[0008] The present invention is a water treatment agent composition comprising water, a nonionic surfactant, an azole compound, and a polymer containing at least an acrylamide group as a monomer unit.

[0009] In the water treatment agent composition, the polymer is preferably a binary copolymer containing a monomer unit of formula (1) and a monomer unit of formula (2). [ka] (1) (In formula (1), R 1 represents a hydrogen atom or a methyl group, and X 1 represents a hydrogen atom, a monovalent or divalent metal atom, an ammonium group, or an organic ammonium group. [ka] (2) (In formula (2), R 2 represents a hydrogen atom or a methyl group, and X 2 represents an alkylsulfonic acid group or a salt thereof, or an arylsulfonic acid group or a salt thereof, and in the case of a salt, it is a monovalent or divalent metal salt, an ammonium salt, or an organic ammonium salt.

[0010] In the water treatment agent composition, the polymer is preferably a terpolymer containing a monomer unit of formula (1), a monomer unit of formula (2), and a monomer unit of formula (3). [ka] (3) (In formula (3), R 3represents a hydrogen atom or a methyl group, and X 3 and X 4 each independently represents a hydrogen atom or an alkyl group, provided that at least one of them is an alkyl group.

[0011] In the water treatment agent composition, the blending amount of the polymer is preferably at least twice as much as that of the azole compound in terms of solid content.

[0012] In the water treatment composition, the nonionic surfactant is preferably a polyoxyalkylene alkyl ether.

[0013] The present invention relates to a water treatment method for treating an aqueous system using the water treatment agent composition. Effect of the Invention

[0014] The present invention can provide a water treatment agent composition in which a nonionic surfactant and an azole compound are combined into one agent, in which clouding is suppressed, and a water treatment method using the water treatment agent composition. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes an embodiment of the present invention. The embodiment is merely an example of implementing the present invention, and the present invention is not limited to the embodiment.

[0016] <Water Treatment Agent Composition> The water treatment agent composition according to the present embodiment is a composition containing water, a nonionic surfactant, an azole compound, and a polymer containing at least an acrylamide group as a monomer unit. The water treatment agent composition according to the present embodiment is a one-part composition containing water, a nonionic surfactant, an azole compound, and a polymer containing at least an acrylamide group as a monomer unit.

[0017] The present inventors have found that white turbidity can be suppressed by blending a specific polymer, that is, a polymer containing at least an acrylamide group as a monomer unit, into a composition containing water, a nonionic surfactant, and an azole compound. By blending a polymer containing an acrylamide group as a monomer unit, the white turbidity of the composition is alleviated, and it becomes possible to visually confirm, for example, the state of dissolution of solids in the solution of the composition immediately after mixing the components.

[0018] The water is not particularly limited, but examples thereof include pure water and ultrapure water.

[0019] The nonionic surfactant is not particularly limited, and examples thereof include polyoxyalkylene alkyl ethers such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers such as polyoxyethylene nonylphenyl ethers, polyoxyethylene alkyl allyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene sorbitan fatty acid esters, alkyl glucosides, polyoxyethylene fatty acid esters, polyoxyethylene castor oil, polyhydric alcohol fatty acid esters such as sucrose fatty acid esters and sorbitan fatty acid esters, polyhydric alcohol alkyl ethers, fatty acid alkanolamides, ethylene oxide / propylene oxide adducts of lower / higher alcohols, sucrose fatty acid salt esters, alkanolamides, etc. From the viewpoint of the stability of the formulation, etc., polyoxyalkylene alkyl ethers are preferred.

[0020] The azole compound acts as an anticorrosive agent for copper-based metals such as copper and copper alloys. The azole compound is not particularly limited, but examples thereof include 1,2,3-benzotriazole, tolyltriazole, 1,2,4-triazole, 3-amino-1,2,4-triazole, imidazole, 2-mercaptobenzimidazole, and 2-mercaptobenzothiazole, and may be used alone or in combination of two or more. Among these, benzotriazole and tolyltriazole are preferred from the viewpoint of production cost.

[0021] The polymer containing an acrylamide group as a monomer unit is not particularly limited, and examples thereof include a polymer containing a monomer unit of the following formula (2), a copolymer containing a monomer unit of the following formula (3), a binary copolymer containing a monomer unit of the following formula (1) and a monomer unit of the following formula (2), and a terpolymer containing a monomer unit of the following formula (1), a monomer unit of the formula (2), and a monomer unit of the formula (3).

[0022] [ka] (1) (In formula (1), R 1 represents a hydrogen atom or a methyl group, and X 1 represents a hydrogen atom, a monovalent or divalent metal atom, an ammonium group, or an organic ammonium group.

[0023] [ka] (2) (In formula (2), R 2 represents a hydrogen atom or a methyl group, and X 2 represents an alkylsulfonic acid group or a salt thereof, or an arylsulfonic acid group or a salt thereof, and in the case of a salt, it is a monovalent or divalent metal salt, an ammonium salt, or an organic ammonium salt.

[0024] [ka] (3) (In formula (3), R 3 represents a hydrogen atom or a methyl group, and X 3 and X 4 each independently represents a hydrogen atom or an alkyl group, provided that at least one of them is an alkyl group.

[0025] Examples of the organic ammonium salts in the formulas (1) and (2) include alkylammonium groups or (hydroxy)alkylammonium groups having an alkyl group or hydroxyalkyl group having 1 to 4 carbon atoms.

[0026] Examples of the monovalent or divalent metal salt in the formulas (1) and (2) include sodium salts, potassium salts, calcium salts, and magnesium salts.

[0027] X in formula (2) 2 When X is an alkylsulfonic acid group or a salt thereof, the alkyl group is preferably an alkyl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 1 to 8 carbon atoms. 2 When is an arylsulfonic acid group or a salt thereof, the aryl group is preferably an aryl group or arylalkyl group having 6 to 10 carbon atoms.

[0028] The alkyl group in the formula (3) is preferably an alkyl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 1 to 8 carbon atoms.

[0029] The weight ratio of the monomer units in a binary copolymer containing the monomer units of the formula (1) and the monomer units of the formula (2) is, for example, 1-99:99-1.

[0030] The weight ratio of the monomer units in a terpolymer containing the monomer units of the formula (1), the monomer units of the formula (2), and the monomer units of the formula (3) is, for example, 1-98:1-98:1-98.

[0031] The weight average molecular weight of the polymer containing an acrylamide group as a monomer unit is, for example, in the range of 200 to 100,000, preferably in the range of 1,000 to 30,000, and more preferably in the range of 1,500 to 20,000. If the weight average molecular weight is less than 200, the scale dispersion effect and crystal habit effect may decrease, and if it exceeds 100,000, the viscosity may be high and handling may be difficult.

[0032] Examples of polymers containing an acrylamide group as a monomer unit include a binary copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid (AA / AMPS), a ternary copolymer of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, and t-butylacrylamide (AA / AMPS / t-BAM), and a ternary copolymer of phosphonic acid, acrylic acid, and 2-acrylamido-2-methylpropanesulfonic acid (PA / AA / AMPS). Among these, the binary copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid (AA / AMPS) and the ternary copolymer of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, and t-butylacrylamide (AA / AMPS / t-BAM) are preferred from the standpoint of scale dispersion effect and the like.

[0033] In the water treatment agent composition, the blending amount of the polymer containing an acrylamide group as a monomer unit is, for example, at least twice, preferably at least four times, and more preferably in the range of 4 to 10 times, the mass of the solid content of the azole compound. If the blending amount of the polymer is less than twice the mass of the azole compound in terms of solid content, the effect of suppressing clouding may not be obtained, whereas if it exceeds 10 times, the viscosity may be high and handling may be difficult.

[0034] In the water treatment agent composition, the amount of the nonionic surfactant is, for example, in the range of 0.001 to 2.0 mass% as solid content relative to the azole compound, preferably in the range of 0.01 to 2.0 mass%, and more preferably in the range of 0.1 to 1.0 mass%. If the amount of the nonionic surfactant is less than 0.001 mass% as solid content relative to the azole compound, the stability of the formulation may decrease, and if it exceeds 2.0 mass%, the effect of suppressing clouding may not be obtained.

[0035] In the water treatment agent composition, the solid content concentration is, for example, in the range of 0.1 to 70 mass%, preferably in the range of 1 to 70 mass%, and more preferably in the range of 1 to 60 mass%. If the solid content concentration is less than 0.1 mass%, the scale dispersion effect and metal corrosion inhibition effect may not be obtained, and if it exceeds 70 mass%, the stability of the formulation may decrease.

[0036] The pH of the water treatment agent composition is, for example, in the range of 1.5 to 4.0, preferably in the range of 2.0 to 4.0, and more preferably in the range of 2.0 to 3.5. If the pH of the composition is less than 1.5, a large amount of acid may be required, and if it exceeds 4.0, the storage stability of the composition may decrease.

[0037] The pH of the composition may be adjusted to a predetermined pH without any particular limitation. For example, a pH adjuster such as an acid, e.g., hydrochloric acid, sulfuric acid, or nitric acid, or an alkali, e.g., an aqueous solution of sodium hydroxide or an aqueous solution of potassium hydroxide, may be used.

[0038] The water treatment agent composition may contain other components such as an oxidizing agent in addition to water, a nonionic surfactant, an azole compound, and a polymer containing at least an acrylamide group as a monomer unit.

[0039] <Water treatment method> The water treatment method according to the present embodiment is a method for treating a water system using the water treatment agent composition. For example, a predetermined amount of the water treatment agent composition may be added to a water system.

[0040] The amount of the azole compound in the aqueous system may be, for example, in the range of 0.1 to 5.0 mg / L relative to the amount of water to be treated, and preferably in the range of 0.5 to 2.0 mg / L. If the amount of the azole compound is less than 0.1 mg / L relative to the amount of water to be treated, the metal corrosion inhibitory effect may not be obtained, whereas if it exceeds 5.0 mg / L, the amount of chemicals used may increase.

[0041] The pH of the aqueous system is, for example, in the range of 6.5 to 9.0, preferably in the range of 6.5 to 8.2, and more preferably in the range of 6.8 to 8.2. If the pH of the aqueous system is less than 6.5, corrosive gas may be generated, and if it exceeds 9.0, scale may be generated.

[0042] The pH of the aqueous system can be adjusted to a predetermined pH level without any particular limitation. For example, a pH adjuster such as an acid, e.g., hydrochloric acid, sulfuric acid, or nitric acid, or an alkali, e.g., an aqueous sodium hydroxide solution, or an aqueous potassium hydroxide solution, can be used.

[0043] The water treatment agent composition according to the present embodiment can be used for water treatment of industrial water systems such as cooling water, pipe cleaning where scale deposition occurs, etc. The water treatment agent composition according to the present embodiment can be suitably used in an aqueous system containing scale components.

[0044] In the water treatment method according to the present embodiment, in addition to the water treatment agent composition, other agents such as an oxidizing agent may be used.

[0045] This specification includes the following embodiments. [1] A water treatment composition comprising water, a nonionic surfactant, an azole compound, and a polymer containing at least an acrylamide group as a monomer unit.

[0046] [2] The water treatment composition according to [1], The water treatment agent composition, wherein the polymer is a binary copolymer containing a monomer unit of formula (1) and a monomer unit of formula (2). [ka] (1) (In formula (1), R 1 represents a hydrogen atom or a methyl group, and X 1 represents a hydrogen atom, a monovalent or divalent metal atom, an ammonium group, or an organic ammonium group. [ka] (2) (In formula (2), R 2 represents a hydrogen atom or a methyl group, and X 2 represents an alkylsulfonic acid group or a salt thereof, or an arylsulfonic acid group or a salt thereof, and in the case of a salt, it is a monovalent or divalent metal salt, an ammonium salt, or an organic ammonium salt.

[0047] [3] The water treatment composition according to [1], The water treatment agent composition, wherein the polymer is a terpolymer containing a monomer unit of formula (1), a monomer unit of formula (2), and a monomer unit of formula (3). [ka] (3) (In formula (3), R 3 represents a hydrogen atom or a methyl group, and X 3 and X 4 each independently represents a hydrogen atom or an alkyl group, provided that at least one of them is an alkyl group.

[0048] [4] The water treatment agent composition according to any one of [1] to [3], The water treatment agent composition, wherein the blending amount of the polymer is at least twice as much as that of the azole compound in terms of solid content.

[0049] [5] The water treatment agent composition according to any one of [1] to [4], The water treatment composition, wherein the nonionic surfactant is a polyoxyalkylene alkyl ether.

[0050] [6] A water treatment method, which comprises treating an aqueous system using the water treatment agent composition according to any one of [1] to [5]. EXAMPLES

[0051] EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0052] <Examples and Comparative Examples> In the examples and comparative examples, the preparations were made by adding the drugs in the composition (mass%) and order shown in Table 1. The preparations were made in a glass container at room temperature (25°C ± 1°C) by adding each drug while stirring with a stirrer.

[0053] The polymer used was acrylic acid (AA), the binary copolymer was a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid (AA / AMPS), and the ternary copolymer was a copolymer of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, and alkylacrylamide (AA / AMPS / t-BAM). Pure water was used as water.

[0054] The nonionic surfactant used was polyoxyalkylene alkyl ether, and the azole compound used was benzotriazole.

[0055] In the examples and comparative examples, the turbidity was measured by absorptiometry using a portable water quality analyzer DR / 890 manufactured by HACH Co., Ltd. The pH of the composition was measured using a pH meter (manufactured by DKK-TOA Co., Ltd., IOL-30 type).

[0056] The blending ratio of the polymer to the benzotriazole was calculated as the mass ratio of the solid content. The composition was judged as to whether it could be formulated or not, and those in which phase separation occurred were judged as "not suitable for formulation". Only those judged as "suitable for formulation" were comprehensively judged for turbidity according to the following criteria. The results are shown in Table 1.

[0057] (Judgment criteria (Turbidity (unit: FAU))) ◎:1 or more and 100 or less 〇: More than 100 and less than 500 △: Over 500 to under 1000 (upper measurement limit) ×: Over 1000

[0058] [Table 1]

[0059] It can be seen that the compositions of the examples, which contain a polymer containing at least an acrylamide group as a monomer unit, are less likely to become cloudy than the compositions of the comparative examples.

[0060] As described above, in the examples, in the water treatment composition in which a nonionic surfactant and an azole compound were combined into one agent, clouding was suppressed.

Claims

1. A water treatment composition comprising water, a nonionic surfactant, an azole compound, and a polymer containing at least an acrylamide group as a monomer unit.

2. The water treatment composition according to claim 1, The water treatment agent composition, wherein the polymer is a binary copolymer containing a monomer unit of the formula (1) and a monomer unit of the formula (2). 【Chemistry 1】 （１） (In formula (1), R １ represents a hydrogen atom or a methyl group, X １ represents a hydrogen atom, a monovalent or divalent metal atom, an ammonium group, or an organic ammonium group. 【Chemistry 2】 （２） (In formula (2), R ２ represents a hydrogen atom or a methyl group, X ２ represents an alkylsulfonic acid group or a salt thereof, or an arylsulfonic acid group or a salt thereof, and in the case of a salt, it is a monovalent or divalent metal salt, an ammonium salt, or an organic ammonium salt.

3. The water treatment composition according to claim 1, The water treatment agent composition, wherein the polymer is a terpolymer containing a monomer unit of formula (1), a monomer unit of formula (2), and a monomer unit of formula (3). 【Chemistry 3】 （３） (In formula (3), R ３ represents a hydrogen atom or a methyl group, X ３ and X ４ each independently represents a hydrogen atom or an alkyl group, provided that at least one of them is an alkyl group.

4. The water treatment composition according to any one of claims 1 to 3, A water treatment agent composition comprising the polymer in an amount at least twice as much as the azole compound in terms of solid content.

5. The water treatment composition according to any one of claims 1 to 3, 1. A water treatment composition, comprising: a nonionic surfactant; and a polyoxyalkylene alkyl ether.

6. A water treatment method comprising treating an aqueous system with the water treatment agent composition according to claim 1.

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