Alkaline electrolyzed water and method for diluting the same

Abstract

The present invention provides a cleaning composition containing alkaline electrolyzed water, which facilitates the production of a diluted solution having a predetermined pH. [Solution] A cleaning composition is provided which contains bromothymol blue, thymol blue, or phenolphthalein as a pH indicator, and alkaline electrolyzed water having a pH of 12 or higher.

Description

Technical Field

[0001] The present invention relates to alkaline electrolyzed water, particularly alkaline electrolyzed water used for cleaning and sterilization purposes.

Background Art

[0002] Alkaline ion water obtained by electrolyzing an aqueous solution such as saline is widely used, and many reports have been made on its production method (Patent Documents 1 to 8). Weak alkaline ion water can be used as drinking water (Patent Documents 2 and 3). Strong alkaline ion water, which is sometimes called alkaline electrolyzed water, can be used for sterilization and cleaning (Patent Documents 4 to 6). There are also reports on skin care cosmetics containing alkaline electrolyzed water (Patent Document 7).

[0003] It is known to use a solution containing a strong alkaline electrolyte as a disinfectant solution, and it has been reported that a pH indicator is added to visualize the effect of alkalinity (Patent Document 8).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Patent Document 8

[0005] Electrolyzed water for sterilization and cleaning may be used directly from the manufacturing equipment. For example, fishing boats and fish markets can be equipped with dedicated electrolyzed water production equipment to produce strongly alkaline or strongly acidic electrolyzed water free of surfactants and disinfectants from seawater, and use it for cleaning and sterilizing facilities.

[0006] On the other hand, restaurants and other establishments that do not have dedicated manufacturing equipment typically purchase strong alkaline electrolyzed water in large containers, divide it into smaller portions, and then dilute it further for use in cleaning and other applications. However, it is known that the alkalinity of strong alkaline electrolyzed water fluctuates during storage, and a problem has arisen in that it is unclear whether it is appropriate to dilute strong alkaline electrolyzed water that has been stored based on the dilution ratio. [Means for solving the problem]

[0007] To solve the above problems, the inventors conducted extensive research and discovered that by using strongly alkaline electrolyzed water containing a specific pH indicator, it is possible to easily prepare alkaline electrolyzed water with an appropriate pH after dilution, thus completing the invention. This specification encompasses the following disclosures of the invention.

[0008] [A-1] A cleaning composition comprising bromothymol blue, thymol blue, or phenolphthalein as a pH indicator, and alkaline electrolyzed water having a pH of 12 or higher. [A-2] The cleaning composition according to [A-1], wherein alkaline electrolyzed water is prepared by electrolyzing water containing potassium carbonate as an electrolytic aid.

[0009] [A-3] The cleaning composition according to [A-1] or [A-2], wherein the concentration of the pH indicator is 0.0002 to 0.02. [A-4] A cleaning composition according to any of [A-1] to [A-3], which does not contain any solvent other than water.

[0010] [A-5] A cleaning composition according to any one of [A-1] to [A-4], comprising alkali metal ions and / or alkaline earth metal ions. [A-6] A cleaning composition according to any one of [A-1] to [A-5], comprising alkali metal ions.

[0011] [A-7] A cleaning composition containing potassium ions, as described in any of [A-1] to [A-6]. [A-8] A cleaning composition according to any one of [A-1] to [A-7], wherein the concentration of potassium ions is 0.1 to 0.2% by weight. [A-9] A cleaning composition according to any of [A-1] to [A-8], wherein the pH is 12 to 13.5. [A-10] A washing composition according to any one of [A-1] to [A-9], wherein the pH indicator is bromothymol blue.

[0012] [A-11] A cleaning composition according to any of [A-1] to [A-10], which is filled in an airtight container. [A-12] A cleaning composition according to any of [A-1] to [A-11], wherein the container capacity is 4L or more.

[0013] A method for preparing a diluted solution of alkaline electrolyzed water, comprising diluting one of the cleaning compositions described in [B-1], [A-1], to [A-12] with water. [B-2] The preparation method according to [B-1], further comprising diluting the resulting diluted solution with water so that the color of the diluted solution becomes a predetermined color. [Effects of the Invention]

[0014] In one aspect of the present invention, a cleaning composition is provided that allows for the preparation of diluted alkaline electrolyzed water having an appropriate pH after dilution, without the use of special chemicals, from strongly alkaline electrolyzed water containing a specific pH indicator. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a diagram showing an example of an apparatus for producing alkaline electrolyzed water. [Figure 2] Figure 2 is a photograph of the colored alkaline electrolyzed water A prepared in Example 2. [Figure 3] Figure 3 is a photograph of the diluted colored alkaline electrolyzed water B prepared in Example 3. [Figure 4] Figure 4 is a photograph of the diluted colored alkaline electrolyzed water C prepared in Example 4. [Figure 5] Figure 5 is a photograph of the diluted colored alkaline electrolyzed water D prepared in Example 5. [Figure 6] Figure 6 is a photograph of the colored alkaline electrolyzed water E prepared in Example 6. [Figure 7] Figure 7 is a photograph of the diluted colored alkaline electrolyzed water F prepared in Example 7. [Figure 8] Figure 8 is a photograph of the diluted colored alkaline electrolyzed water G prepared in Example 8. [Figure 9] Figure 9 is a photograph of the diluted colored alkaline electrolyzed water H prepared in Example 9. [Figure 10] Figure 10 is a photograph of the colored alkaline electrolyzed water K prepared in Example 10. [Figure 11] Figure 11 is a photograph of the diluted colored alkaline electrolyzed water L prepared in Example 11. [Figure 12] Figure 12 is a photograph of the diluted colored alkaline electrolyzed water M prepared in Example 12. [Figure 13] Figure 13 is a photograph of the diluted colored alkaline electrolyzed water N prepared in Example 13.

[0016] The alkaline electrolyzed water described in this specification is not particularly limited and can be produced by known methods. In one aspect of the present invention, the alkaline electrolyzed water can be the alkaline electrolyzed water generated on the cathode side by electrolysis of water. In one aspect of the present invention, the alkaline electrolyzed water can be obtained by purchase.

[0017] In one aspect of the present invention, the electrolytic water generator is not particularly limited and commercially available products can be used. In one embodiment, an electrolytic cell can be used that has an anode chamber in which an anode is arranged, a cathode chamber in which a cathode is arranged, and a diaphragm separating the anode chamber and the cathode chamber.

[0018] In one aspect of the present invention, the electrolyte used for producing alkaline electrolyzed water may be an aqueous solution containing 1 to 30% by weight of an electrolytic additive such as an alkali metal salt or an alkaline earth metal salt. In one embodiment, an electrolytic additive selected from sodium bicarbonate, sodium carbonate, potassium bicarbonate, and potassium carbonate may be used.

[0019] In one aspect of the present invention, the pH of the alkaline electrolyzed water is 12 or higher, 12.7 or higher, or 13 or higher. In one embodiment, the pH of the alkaline electrolyzed water is 10-11, 11-12, or 12-13.

[0020] In one aspect of the present invention, the pH of the alkaline electrolyzed water used for dilution is 12 or higher, 12.7 or higher, or 13 or higher. In one embodiment, the pH of the alkaline electrolyzed water after dilution is 9-11, 9-12, 9-13, 10-11, 10-12, 10-13, 11-12, 11-13, or 12-13.

[0021] In one aspect of the present invention, the total concentration of alkali metal ions and alkaline earth metal ions contained in alkaline electrolyzed water is 0.2% by weight or less, 0.1% by weight or less, or 0.9% by weight or less.

[0022] In one aspect of the present invention, the pH indicator is selected from bromothymol blue, thymol blue, or phenolphthalein, and the alkaline electrolyzed water may contain one or more pH indicators. In one aspect of the present invention, the concentration of the pH indicator in the alkaline electrolyzed water is 0.0000001% by weight or more, 0.000001% by weight or more, or 0.00001% by weight or more, and 0.2% by weight or less, 0.1% by weight or less, 0.08% by weight or less, or 0.05% by weight or less. In one embodiment, the concentration of the pH indicator in the alkaline electrolyzed water is 0.0000001 to 0.2% by weight, 0.000001 to 0.1% by weight, or 0.00001 to 0.08% by weight. In one embodiment, the concentration of BTB in the alkaline electrolyzed water before dilution is 0.001 to 0.2% by weight, 0.002 to 0.1% by weight, or 0.005 to 0.01% by weight.

[0023] In one aspect of the present invention, the pH indicator is bromothymol blue (BTB). In one aspect of the present invention, the concentration of BTB in the alkaline electrolyzed water is 0.0000001% by weight or more, 0.000001% by weight or more, or 0.00001% by weight or more, and 0.2% by weight or less, 0.1% by weight or less, 0.08% by weight or less, or 0.05% by weight or less. In one embodiment, the concentration of BTB in the alkaline electrolyzed water is 0.0000001 to 0.2% by weight, 0.000001 to 0.1% by weight, or 0.00001 to 0.08% by weight. In one embodiment, the concentration of BTB in the alkaline electrolyzed water before dilution is 0.001 to 0.2% by weight, 0.002 to 0.1% by weight, or 0.005 to 0.01% by weight.

[0024] In one aspect of the present invention, the pH indicator is thymol blue (TB). In one aspect of the present invention, the concentration of TB in the alkaline electrolyzed water is 0.0000001% by weight or more, 0.000001% by weight or more, or 0.00001% by weight or more, and 0.2% by weight or less, 0.1% by weight or less, 0.08% by weight or less, or 0.05% by weight or less. In one embodiment, the concentration of TB in the alkaline electrolyzed water is 0.0000001 to 0.2% by weight, 0.000001 to 0.1% by weight, or 0.00001 to 0.08% by weight. In one embodiment, the concentration of TB in the alkaline electrolyzed water before dilution is 0.0000001 to 0.2% by weight, 0.000001 to 0.1% by weight, or 0.00001 to 0.08% by weight.

[0025] In one aspect of the present invention, the pH indicator is phenolphthalein (PP). In one aspect of the present invention, the concentration of PP in alkaline electrolyzed water is 0.0000001% by weight or more, 0.000001% by weight or more, or 0.00001% by weight, and 0.2% by weight or less, 0.1% by weight or less, 0.0% by weight or less, or 0.05% by weight or less. In one embodiment, the concentration of PP in alkaline electrolyzed water is 0.0000001 to 0.2% by weight, 0.000001 to 0.1% by weight, or 0.00001 to 0.08% by weight. In one embodiment, the concentration of PP in alkaline electrolyzed water before dilution is 0.0000001 to 0.2% by weight, 0.000001 to 0.1% by weight, or 0.00001 to 0.08% by weight.

[0026] In one aspect of the present invention, the cleaning composition does not contain any solvent other than water, and does not contain, for example, C1-C6 alcohols, specifically ethanol. In one aspect of the present invention, the airtight container for filling the cleaning composition is not particularly limited as long as it is an airtight container that is normally used for cleaning compositions. In one embodiment, the container is a glass container or a resin container, and examples of resin containers include PET resin containers, PE containers, PP containers, etc.

[0027] In one aspect of the present invention, the capacity of the container is 500 mL or more, 1 L or more, 2 L or more, 3 L or more, 4 L or more, or 5 L or more. In one aspect of the present invention, the amount of cleaning composition filled in the container is 500 mL or more, 1 L or more, 2 L or more, 3 L or more, 4 L or more, or 5 L or more, and a container with a capacity suitable for the amount of cleaning composition can be used.

[0028] In one aspect of the present invention, a diluted solution with a predetermined pH (e.g., pH 10-12) can be prepared by diluting alkaline electrolyzed water containing a pH indicator. In one embodiment of the present invention, a diluted solution having a predetermined pH can be prepared by confirming that the diluted solution exhibits a predetermined hue derived from the pH indicator. In one embodiment, the predetermined hue is determined visually by comparison with information (e.g., a specific color) shown in the instruction manual, accompanying documents, or product information displayed on the web. In one embodiment of the present invention, the water used for dilution is not particularly limited, and for example, pure water, deionized water, or tap water can be used.

[0029] The present invention will be illustrated below with examples, but this is not intended to limit the invention. Unless otherwise specified in this specification, percentages refer to weight percentages. Furthermore, the color codes described to indicate hue are strings of characters representing the RGB values ​​in hexadecimal in order to display colors in computer languages ​​such as HTML, and are understandable to those skilled in the art. Unless otherwise specified, the color codes described in the following examples were determined by visual inspection.

[0030] [Example 1] Alkaline electrolyzed water was produced using a two-chamber alkaline electrolyzed water production apparatus with a diaphragm. A potassium carbonate aqueous solution (concentration: 25%) was prepared using pure water, and the potassium carbonate aqueous solution was circulated to the anode tank with a circulation time of 45 minutes, a voltage of 16V, and 5 circulation cycles. The operation was repeated on the cathode side until the pH of the alkaline electrolyzed water obtained was between 12.5 and 13.2, and the resulting alkaline electrolyzed water was collected.

[0031] [Example 2] Preparation of colored alkaline electrolyzed water 1 Alkaline electrolyzed water (pH 13.2, 493.3 g) prepared by the method described in Example 1 was mixed with bromothymol blue (Fujifilm Wako Pure Chemical Industries, Ltd., JAN 4987481217034, 0.1 g) and stirred at room temperature for 30 minutes to prepare colored alkaline electrolyzed water A. The concentration of bromothymol blue (BTB) was 0.02%. The pH measured after preparation was 12.95. It was a dark blue solution with a primary color code of #191970.

[0032] [Example 3] Preparation of diluted solution of colored alkaline electrolyzed water 1 424.47 g of deionized water was mixed with 44.39 g of colored alkaline electrolyzed water A prepared in Example 3, and the mixture was stirred for 5 minutes to prepare diluted colored alkaline electrolyzed water solution B. The concentration of bromothymol blue was 0.002%, and the pH measured after preparation was 12. The solution was blue, and the primary color code was #0000cd.

[0033] [Example 4] Preparation of diluted solution of colored alkaline electrolyzed water 2 Dilution B (50.249g) prepared in Example 3 was added to pure water (435.08g) and stirred for 5 minutes to prepare dilution C of colored alkaline electrolyzed water. The concentration of bromothymol blue was 0.0002%, and the pH measured after preparation was 11.02. It was a pale blue solution, and the primary color code was #00bfff. It can be confirmed that it is still colored.

[0034] [Example 5] Preparation of diluted solution of colored alkaline electrolyzed water 3 Dilution C (56.579g) prepared in Example 4 was added to pure water (438.89g), and the mixture was stirred for 5 minutes to prepare dilution D of colored alkaline electrolyzed water. The concentration of bromothymol blue was 0.00002%, and the pH was 9.75. It was almost colorless, and the primary color code was #ffffff.

[0035] From the results of Examples 1-4, it was confirmed visually that colored alkaline electrolyzed water A (BTB concentration: 0.02%, pH: 12.95) was a dark, almost blackish blue (navy blue), while its 10-fold diluted solution B (BTB concentration: 0.002%, pH: 12) exhibited a bright blue color, and the difference in hue between the two was clearly visible. Blue color was also observed in diluted solution C (BTB concentration: 0.0002%, pH: 11.02), but diluted solution D (BTB concentration: 0.00002%, pH: 9.75) was almost colorless. From these results, it was confirmed that by using BTB as a coloring agent, diluted solutions of alkaline electrolyzed water with a pH above 10 can be prepared without the use of special equipment.

[0036] [Example 6] Preparation of colored alkaline electrolyzed water 2 Alkaline electrolyzed water (pH 13.2, 437.7 g) prepared by the method described in Example 1 was mixed with thymol blue (Fujifilm Wako Pure Chemical Industries, Ltd., JAN 4987481334526, 0.04 g) and stirred at room temperature for 30 minutes to prepare colored alkaline electrolyzed water E. The concentration of thymol blue (TB) was 0.009%. The pH was 12.89. It was a dark blue solution with a primary color code of #191970.

[0037] [Example 7] Preparation of diluted solution of colored alkaline electrolyzed water 4 60.3g of colored alkaline electrolyzed water E prepared in Example 6 was added to 405.3g of pure water and stirred for 5 minutes to prepare diluted colored alkaline electrolyzed water solution F. The concentration of thymol blue was 0.0012%. The pH was 12.15. The primary color code for the blue solution was #4b0082.

[0038] [Example 8] Preparation of a diluted solution of colored alkaline electrolyzed water 5 Diluted solution F (68.4g) of the colored alkaline electrolyzed water prepared in Example 7 was added to pure water (413.8g), and the mixture was stirred for 5 minutes to prepare diluted solution G of the colored alkaline electrolyzed water. The concentration of thymol blue was 0.0002%. The pH was 11.35. It was a pale blue solution, and the primary color code was #7b68ee.

[0039] [Example 9] Preparation of diluted solution of colored alkaline electrolyzed water 6 Dilution G of the colored alkaline electrolyzed water prepared in Example 8 (50.1g) was added to pure water (422.1g), and the mixture was stirred for 5 minutes to prepare dilution H of the colored alkaline electrolyzed water. The concentration of thymol blue was 0.00002%. The pH was 10.19. It was a pale blue solution, and the primary color code was #e0ffff.

[0040] From the results of Examples 6-8, it was confirmed visually that colored alkaline electrolyzed water E (TB concentration: 0.009%, pH: 12.89) was a deep blue color, while diluted solution F (TB concentration: 0.0012%, pH: 12.15) exhibited a bluish-purple color. The difference in hue between the two was also confirmed. Bluish-purple was also observed in diluted solution G (TB concentration: 0.0002%, pH: 11.35), and a light blue hue was observed in diluted solution H (TB concentration: 0.00002%, pH: 10.19). From these results, it was confirmed that by using TB as a coloring agent, diluted solutions of alkaline electrolyzed water with a pH above 10 can be prepared without the use of special equipment.

[0041] [Example 10] Preparation of colored alkaline electrolyzed water 3 Alkaline electrolyzed water (pH 13.2, 446.7 g) prepared by the method described in Example 1 was mixed with phenolphthalein (Fujifilm Wako Pure Chemical Industries, Ltd., JAN 4987481307322, 0.19 g) and stirred at room temperature for 30 minutes to prepare colored alkaline electrolyzed water K. The concentration of phenolphthalein (PP) was 0.043%. The pH was 12.90. The liquid was red, and the primary color code was #dc143c.

[0042] [Example 11] Preparation of diluted solution of colored alkaline electrolyzed water 7 66.5g of colored alkaline electrolyzed water K (prepared in Example 10) was added to pure water (403.3g), and the mixture was stirred for 5 minutes to prepare diluted colored alkaline electrolyzed water solution L. The concentration of phenolphthalein was 0.006%. The pH was 12.16. The red solution had a primary color code of #ff1493.

[0043] [Example 12] Preparation of diluted solution of colored alkaline electrolyzed water 8 65.7g of colored alkaline electrolyzed water L prepared in Example 11 was added to pure water (419.4g), and the mixture was stirred for 5 minutes to prepare diluted colored alkaline electrolyzed water solution M. The concentration of phenolphthalein was 0.0008%. The pH was 11.33. The solution was pale pink, and the primary color code was #ff00ff.

[0044] [Example 13] Preparation of diluted solution of colored alkaline electrolyzed water 9 395.6g of pure water was mixed with 56.9g of colored alkaline electrolyzed water M prepared in Example 12, and the mixture was stirred for 5 minutes to prepare diluted colored alkaline electrolyzed water solution N. The concentration of phenolphthalein was 0.0001%. The pH was 10.30. The solution was pale pink, and the primary color code was #ee82ee.

[0045] The results from Examples 10-13 showed that colored alkaline electrolyzed water K (PP concentration: 0.043%, pH: 12.90) was red, while diluted solution L (PP concentration: 0.006%, pH: 12.15) was pink, and the difference in hue between the two was visually confirmed. Pink color was also observed in diluted solution M (PP concentration: 0.0008%, pH: 11.33), and a light pink hue was also observed in diluted solution N (PP concentration: 0.0001%, pH: 10.30). From these results, it was confirmed that by using PP as a coloring agent, diluted solutions of alkaline electrolyzed water with a pH above 10 can be prepared without the use of special equipment.

Claims

1. A cleaning composition comprising bromothymol blue, thymol blue, or phenolphthalein as a pH indicator, and alkaline electrolyzed water having a pH of 12 or higher.

2. The cleaning composition according to claim 1, wherein the concentration of the pH indicator is 0.0002 to 0.

02.

3. A cleaning composition according to claim 1 or 2, which does not contain any solvent other than water.

4. A cleaning composition according to any one of claims 1 to 3, comprising alkali metal ions and / or alkaline earth metal ions.

5. A cleaning composition according to any one of claims 1 to 4, comprising potassium ions.

6. A cleaning composition according to any one of claims 1 to 5, wherein the pH is 12 to 13.

5.

7. A cleaning composition according to any one of claims 1 to 6, which is filled in an airtight container.

8. A method for preparing a diluted solution of alkaline electrolyzed water, comprising diluting the cleaning composition according to any one of claims 1 to 7 with water.

9. Furthermore, the preparation method according to claim 8, wherein the diluted solution is further diluted with water so that the resulting diluted solution has a predetermined color.

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