JP2014196266A - Oxidative slime control agent composition having high storage stability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oxidative slime control agent composition in which an oxidative substance, the main ingredient, is invulnerable to decomposition even under high-temperature and/or semi-opened conditions during outdoor standing or storage or outdoor use and which can exert stable slime control performance for a long period.SOLUTION: An oxidative slime control agent composition comprises at least one oxidative substance selected from chloramine B and chloramine T and at least one azole compound and has a pH of 10.0 or higher.

Description

  The present invention relates to an oxidation slime control agent composition having high storage stability, particularly when it is left and stored outdoors, or when used outdoors, etc. The present invention relates to an oxidizing slime control agent composition capable of exhibiting a slime control performance that is resistant to decomposition and is stable for a long period of time.

  In various water systems such as circulating cooling water systems and industrial process water systems, various obstacles occur due to microorganisms such as bacteria, fungi and algae.

  For example, in an open-circulation cooling water system, bacteria such as zoom glial bacteria, filamentous bacteria, iron bacteria, sulfur bacteria, nitrifying bacteria, sulfate-reducing bacteria, fungi such as water mold and blue mold, cyanobacteria, green algae, diatoms, etc. Algae grow and soft mud-like slime and sludge are formed, which are mainly composed of these microorganisms and mixed with inorganic materials such as earth and sand and dust. Slime and sludge not only cause a decrease in thermal efficiency and water flow, but also cause local corrosion of equipment and piping. Also in the papermaking process water system, various bacteria, fungi, etc. grow to form slime, causing defects such as holes, spots, and eyeballs in the product, reducing product quality and causing paper breaks. Productivity is reduced.

  Conventionally, various techniques have been proposed in order to prevent the above-described damage caused by microorganisms, and in particular, Japanese Patent Application Laid-Open No. 64-15200 (Patent Document 1), Japanese Patent Application Laid-Open No. 2000-140857 (Patent Document 2), etc. The treatment with a halogen-based oxidant disclosed in 1) is extremely effective for sterilization of various microorganisms and biofilm growth suppression.

  However, halogen-based oxidizers such as hypochlorite have poor storage stability, and if the sterilizing algicide containing these as a main component is filled in a plastic container etc. and stored or left outside, the oxidant component Gradually decomposes, and the slime control performance deteriorates. JP-A-2003-146817 (Patent Document 3) discloses a composition having improved storage stability of a halogen-based oxidant, and has a pH of 13 or more containing a chlorine-based oxidant, sulfamic acid or a salt thereof, and an azole compound. Although a disinfectant algicidal composition is disclosed, it is necessary to pay attention to the safety of the operator when handling the composition because the composition is strongly alkaline having a pH of 13 or higher. When disposing of the composition, a procedure as specially controlled industrial waste is required. Even in this composition, the storage stability of the oxidant component is not sufficient at pH 13.0, and the oxidant component is decomposed over time at a high temperature state or in a half-open state, causing a decrease in concentration. In particular, in a chemical tank installed near the cooling tower, the temperature of the chemical rises when the tank is exposed to direct sunlight. Usually, since the chemical tank is half open, strong alkaline chemicals are in the air. There was a problem that the pH was gradually lowered by absorbing carbon dioxide gas, and the decomposition of the oxidant component accelerated at an accelerated rate over time.

JP-A 64-15200 JP 2000-140857 A JP 2003-146817 A

  The present invention improves storage stability, which is a drawback of an oxidizing slime control agent, which has been considered to have a very high effect of preventing microbial damage from the past, and can be left and stored outdoors or stored outdoors. Provides an oxidizing slime control agent composition that is less susceptible to degradation of the main oxidizing material even under high-temperature and half-open conditions, and can exhibit stable slime control performance for a long period of time. The purpose is to do.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors use chloramine B and / or chloramine T as an oxidizing substance exhibiting slime control performance, and are blended with an azole compound to thereby reduce pH. It has been found that the decomposition of the oxidizing substance can be suppressed without raising the temperature extremely, and the present invention has been completed based on this finding.

  That is, in order to solve the above problems, the oxidizing slime control agent composition of the present invention comprises, as described in claim 1, at least one oxidizing substance selected from chloramine B and chloramine T, and an azole compound. An oxidizing slime control agent composition comprising at least one kind and having a pH of 10.0 or more.

  Moreover, the oxidizing slime control agent composition of this invention is the oxidizing slime control agent composition of Claim 1 as described in Claim 2, and is at least 1 sort (s) selected from chloramine B and chloramine T. The content of the oxidizing substance is from 1% by weight to 15% by weight, and the content of the azole compound is from 0.05% by weight to 3% by weight.

  In addition, the oxidizing slime control agent composition of the present invention has a pH of 11. in the oxidizing slime control agent composition according to any one of claims 1 and 2, as described in claim 3. It is 5 or more and less than 13.5.

  The oxidizing slime control agent composition of the present invention contains at least one oxidizing substance selected from chloramine B and chloramine T and at least one azole compound, and has a pH of 10.0 or more. Therefore, the oxidizing substance as the main component is not easily decomposed even under high temperature and half-open conditions, and the concentration of the oxidizing substance is long even when it is left and stored outdoors or used outdoors. Since the period is maintained, the deterioration of the slime control performance of the composition is prevented, and the slime control performance stable for a long time can be exhibited in various aqueous systems. In addition, compared with the conventional oxidizing slime control agent composition, since it is not necessary to raise pH extremely, the safety of the operator who handles this composition can be ensured.

  Further, the content of at least one oxidizing substance selected from chloramine B and chloramine T is 1 wt% or more and 15 wt% or less, and the content of the azole compound is 0.05 wt% or more and 3 wt% or less. Thus, a stable slime control agent composition that does not generate precipitates even when left at high or low temperatures for a long period of time can be obtained.

  Furthermore, decomposition | disassembly of an oxidizing substance and generation | occurrence | production of a precipitate can be suppressed more effectively by making pH of an oxidizing slime control agent composition into 11.5 or more and less than 13.5.

  The oxidizing slime control agent composition of the present invention contains at least one oxidizing substance selected from chloramine B and chloramine T and at least one azole compound, and has a pH of 10.0 or more. It is an oxidizing slime control agent composition.

  Chloramine B used as an oxidizing substance in the present invention is IUPAC name: N-chlorobenzenesulfonamide, and chloramine T is IUPAC name: N-chloro-4-methylbenzenesulfonamide. Usually, it is marketed in the form of a sodium salt, but it is included in the present invention regardless of the type of salt as long as it dissolves in water and exhibits oxidizing power and exhibits a slime control effect. Examples of such salts include lithium salts and potassium salts in addition to sodium salts. Chloramine B and chloramine T exhibit oxidizing power as bound residual chlorine in water and sterilize various microorganisms. For both chloramine B and chloramine T, bound chlorine remains at a concentration of about a quarter of the concentration added to the aqueous system. That is, when consumption and decomposition of oxidizing power are ignored, the combined residual chlorine concentration of 4 mg / L aqueous solution of chloramine B and chloramine T is about 1 mg / L.

  The oxidizing slime control agent composition of the present invention contains at least one oxidizing substance selected from the chloramine B and chloramine T. A preferred oxidizing material is chloramine T in terms of availability.

  The content of chloramine B and / or chloramine T in the composition of the present invention is 1% by weight or more and 15% by weight or less, because the composition is stable and precipitates do not occur even when left for a long time. Is preferable. The content of the oxidizing substance is more preferably 3% by weight or more and 10% by weight or less.

  The oxidizing slime control agent composition of the present invention contains an azole compound. The azole compound is generally used as a copper metal anticorrosive, but functions as a stabilizer for chloramine B and / or chloramine T in the present invention.

  The azole compound used in the present invention is an aromatic compound having a five-membered ring containing two or more heteroatoms. Examples of such azole compounds include monocyclic azole compounds such as imidazole, pyrazole, oxazole, thiazole, triazole, and tetrazole, benzimidazole, benzoxazole, benzisoxazole, benzothiazole, mercaptobenzimidazole, and mercaptomethyl. Condensed polycyclic azole compounds such as benzimidazole, mercaptobenzothiazole, benzotriazole, tolyltriazole, indazole, purine, imidazothiazole, pyrazolooxazole, and other compounds that form salts in azole compounds. Can include salts thereof. These azole compounds may be used alone or in combination of two or more. A preferred azole compound is benzotriazole and / or tolyltriazole in that the decomposition inhibitory effect of chloramine B and / or chloramine T is high.

  The content of the azole compound in the composition of the present invention is preferably 0.05% by weight or more and 3% by weight or less, because the composition is stable and precipitates and the like are not generated even when left for a long period of time. . The content of the azole compound is more preferably 0.1% by weight or more and 2% by weight or less.

  In order to ensure the stability of chloramine B and / or chloramine T, the oxidizing slime control agent composition of the present invention needs to have a pH of 10.0 or more. As a pH adjuster for adjusting the pH of the composition to 10.0 or more, a general alkaline agent can be used, and sodium hydroxide, potassium hydroxide, lithium hydroxide and the like are preferably used.

  In the present invention, it is preferable that the pH of the composition is 11.5 or more and less than 13.5 because decomposition of the oxidizing substance and generation of precipitates can be more effectively suppressed. Moreover, if the pH of the composition is less than 12.5, it should be easy to dispose of the composition because it does not fall under specially controlled industrial waste when it becomes necessary to dispose of the composition. Moreover, it is more preferable also when ensuring the safety | security of the operator who handles this composition.

  In the oxidizing slime control agent composition of the present invention, a known anticorrosive agent that has been conventionally used in water treatment applications for the purpose of further improving the properties of the oxidizing slime control agent composition, as long as the effects of the present invention are not hindered, Slime control agents other than the scale inhibitor, chloramine B and chloramine T can be added as appropriate, and such cases are also included in the present invention. In particular, it is preferable to add a scale inhibitor because it becomes a one-component water treatment agent having the effects of slime control, copper corrosion prevention, and scale prevention.

  Examples of the scale inhibitor that can be added to the oxidizing slime control agent composition of the present invention include 2-phosphonobutane-1,2,4-tricarboxylic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, and aminotrimethylenephosphone. Polymers such as phosphonic acids such as acids and water-soluble salts thereof, acrylic acid, maleic acid, methacrylic acid, sulfonic acid, itaconic acid, or isobutylene polymers and copolymers thereof And phosphinocarboxylic acids such as hypophosphorous acid adducts of acrylic acid polymers. Among them, 2-phosphonobutane-1,2,4-tricarboxylic acid or its water-soluble salt, maleic acid, alkyl acrylate, terpolymer of vinyl acetate, hypophosphorous acid adduct of polyacrylic acid, acrylic When at least one scale inhibitor selected from a hypophosphorous acid adduct of a copolymer of an acid and 2-acrylamido-2-methylpropanesulfonic acid is blended, decomposition of the oxidizing substance by the blended scale inhibitor Is preferable because there is almost no.

  Examples of the oxidizing slime control agent composition of the present invention will be specifically described below, but the present invention is not limited thereto.

The chemical | medical agent of a total of 28 types of mixing | blending compositions of Examples 1-15, Comparative Examples 1-12, and Reference Example 1 described in Table 1 to Table 3 was adjusted. In addition, the numerical value of the compounding composition column in each table | surface is content (weight%) of an applicable compound, and the remainder is potassium hydroxide and ion which were used in order to adjust each composition to pH described in the pH column. Exchange water. Moreover, the symbol etc. which were described in the compounding composition column show the following compounds.
Chloramine B: sodium N-chlorobenzenesulfonamide Chloramine T: sodium N-chloro-4-methylbenzenesulfonamide 12% NaClO: 12% aqueous sodium hypochlorite NH ₂ SO ₃ H: sulfamic acid BT: benzotriazole TTA: tolyl Triazole PBTC: 2-phosphonobutane-1,2,4-tricarboxylic acid HEDP: 1-hydroxyethylidene-1,1-diphosphonic acid PMAB: terpolymer of maleic acid, alkyl acrylate, vinyl acetate AAMP: acrylic acid and Hypophosphorous acid adduct of copolymer with 2-acrylamido-2-methylpropanesulfonic acid

  The 28 types of compositions were dispensed 100 mL each into a 100 mL polyethylene white narrow mouth bottle, and allowed to stand at each temperature of 0 ° C., 20 ° C., 45 ° C., and 55 ° C. In addition, about 0 degreeC and 55 degreeC, it was left to stand after sealing, but about 20 degreeC and 45 degreeC, in order to reproduce the condition in a chemical | medical agent tank, it was left in the state (semi-open) in which the stopper was loosened and ventilated.

The oxidative power in the composition was measured over time and the presence or absence of precipitates was observed. The measurement of the oxidizing power of the composition was carried out using iodometric titration of JIS K0101 28.3 described, was calculated as chlorine (Cl ₂₎ in terms of the values (% by weight). The results are shown in each table.

  In Examples 1 to 15 which are the compositions of the present invention, almost no decomposition of oxidative power was observed over a long period of 90 days at 20 ° C. or lower, and the oxidative power after 21 days was 80% even at 45 ° C. and 55 ° C. It remained. In particular, the compositions of the present invention (Examples 1 to 7, 10, 11) whose pH was adjusted to the range of 11.5 to 13.5 had an oxidizing power of 90 after 21 days even at 45 ° C and 55 ° C. % Or more remained. However, since Example 10 with a chloramine T content of 16% produced a precipitate at a high temperature and Example 11 with a benzotriazole content of 4% produced a precipitate at a low temperature. Attention should be paid to the operating temperature.

  On the other hand, even when chloramine B and chloramine T are used as oxidizing substances, when no azole compound is blended (Comparative Examples 1, 2, 7 to 12), the high temperature stability is poor, and the conditions of 45 ° C. and 55 ° C. The remaining oxidizing power after 21 days was less than 80%. Moreover, even when an azole compound was blended, it was found that when the pH of the composition was 9.0 (Comparative Example 6), the reduction in oxidizing power was significant.

  Here, sodium hypochlorite (Comparative Example 3), which is a conventional technology, has a remarkable degradation of oxidizing power at any temperature range, and this tendency cannot be improved even when an azole compound is added (Comparative Example 4). However, the composition of pH 13.0 (Comparative Example 5) containing sodium hypochlorite, sulfamic acid, and an azole compound was also confirmed to be impractical due to poor high-temperature stability.

  From the above results, the oxidizing slime control agent composition of the present invention is superior in stability in the low pH region as compared with the conventional oxidizing slime control agent composition, and it was under conditions of high temperature and half-opening. However, it is understood that the oxidizing substance as the main component is not easily decomposed. Therefore, since the concentration of oxidizing substances is maintained for a long period of time when stored or stored outdoors or when used outdoors, the deterioration of slime control performance of the composition is prevented and stable in various water systems for a long period of time. Slime control performance can be demonstrated.

  Here, as a scale inhibitor in the composition of the present invention, a terpolymer of 2-phosphonobutane-1,2,4-tricarboxylic acid, maleic acid, alkyl acrylate, vinyl acetate, acrylic acid and 2-acrylamide-2 -When at least one selected from hypophosphorous acid adducts of copolymers with methylpropanesulfonic acid is blended (Examples 12 to 15), the blending of the scale inhibitor is relative to the oxidizing substance. It is a suitable scale inhibitor for blending with the present invention without adverse effects. This is an excellent property different from 1-hydroxyethylidene-1,1-diphosphonic acid (Reference Example 1) even with the same scale inhibitor.

Claims (3)

  An oxidizing slime control agent composition comprising at least one oxidizing substance selected from chloramine B and chloramine T and at least one azole compound, and having a pH of 10.0 or more .   The content of at least one oxidizing substance selected from chloramine B and chloramine T is 1% by weight to 15% by weight, and the content of the azole compound is 0.05% by weight to 3% by weight. The oxidizing slime control agent composition according to claim 1.   The oxidizing slime control agent composition according to claim 1 or 2, wherein the pH is 11.5 or more and less than 13.5.