Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B11/00—Oxides or oxyacids of halogens; Salts thereof
  • C01B11/04—Hypochlorous acid
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
  • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
  • A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
  • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
  • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
  • A01N59/08—Alkali metal chlorides; Alkaline earth metal chlorides
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
  • A01P1/00—Disinfectants; Antimicrobial compounds or mixtures thereof
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
  • A01P3/00—Fungicides
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L9/00—Disinfection, sterilisation or deodorisation of air
  • A61L9/01—Deodorant compositions

Definitions

• the present invention relates to hypochlorite water having extremely excellent storage stability.
• Hypochlorous acid is one of the oxo acids of chlorine and is represented as HClO in the composition formula. Hypochlorite has a strong oxidizing power, and exhibits a high bactericidal effect by invading the intracellular cells and oxidizing the DNA and proteins in the bacterial cells, for example. In addition, hypochlorous acid has a wide antibacterial spectrum and can kill a wide range of microorganisms including spore-forming bacteria that cannot be killed by a fungicide such as a quaternary ammonium salt.
• hypochlorous acid is not usually used alone, but is used as hypochlorous acid water which is an aqueous solution containing hypochlorous acid.
• the pH of hypochlorite water is in the range of 3 to 5, and the bactericidal effect is in a suitable range.
• hypochlorite water Since this hypochlorite water is relatively safe for the human body, it is used as a disinfectant or bactericidal agent in various fields such as medical treatment, agriculture, and food processing. In recent years, it has come to be used for public facilities such as nursing care facilities, educational facilities, and commercial facilities, as well as for sterilization and sterilization in general households, and its consumption is increasing year by year.
• hypochlorous acid is unstable and easily causes a disproportionation reaction. For example, even if it is stored in a cool and dark place, it is gradually decomposed into hydrogen chloride and oxygen by the disproportionation reaction of 2HClO ⁇ 2HCl + O 2 . In addition, heating and light promote the disproportionation reaction of hypochlorous acid. Therefore, usually hypochlorite water has a problem of low storage stability. Therefore, the hypochlorite water is usually used up immediately after production. For example, in the form of storing hypochlorous acid water in small portions in a container and using it little by little as needed, the decomposition of hypochlorous acid progresses with the passage of time, and the effect of hypochlorous acid is exhibited. This is not possible, and even if the hypochlorous acid water is left unused, there is a problem that it must be discarded.
• Patent Document 1 discloses that the storage stability of hypochlorous acid water is improved by removing metal ions and reducing the amount of metal ions contained in hypochlorous acid water.
• Patent Document 2 discloses a method for producing an aqueous hypochlorous acid solution by adding / diluting sodium hypochlorite and hydrochloric acid to ultrapure water. Since sodium hypochlorite is used in this production method, the produced aqueous solution of hypochlorite contains a large amount of sodium ions, which are metal ions, even though ultrapure water is used in the production process. , May affect storage stability.
• a production method for producing hypochlorite by mixing a raw material aqueous solution composed of an aqueous sodium hypochlorite solution and an ion exchange resin and performing ion exchange between sodium ions and hydrogen ions.
• a manufacturing method in which the concentration of sodium ions with respect to the effective chlorine concentration is kept below a certain threshold value by keeping the amount ratio of the raw material aqueous solution and the weakly acidic ion exchange resin within a predetermined range and keeping the mixing time below a certain level.
• Patent Document 3 According to this production method, the effective chlorine concentration of hypochlorous acid when stored at 50 ° C. is maintained at about 80% after 30 days.
• hypochlorous acid is also required to have higher storage stability.
• an object of the present invention is to provide a hypochlorite water having higher storage stability.
• the present inventors have diligently investigated factors that affect the storage stability of hypochlorite water other than metal ions. As a result, it was found that the silicon compound contained in the hypochlorite water greatly affects the storage stability.
• hypochlorite water has high storage stability, and the present invention was completed.
• the present invention is a hypochlorite water characterized in that the ion concentration of sodium ions per 100 ppm of effective chlorine concentration is 20 ppm or less, and the content of silicon compounds is 20 ppb or less in terms of silicon. be.
• the hypochlorite water of the present invention has a feature of high storage stability by controlling the content of a silicon compound, which is one of the factors affecting the storage stability of the hypochlorite water. For example, even if the hypochlorite water of the present invention is stored in a dark place at 25 ° C. for one year, the effective chlorine concentration of the hypochlorite water after storage is maintained at 90% or more of the effective chlorine concentration before storage. As a result, high bactericidal ability can be maintained for a long period of time.
• hypochlorite water of the present invention does not need to be used up immediately after production, it is necessary to divide the hypochlorite water into small containers and store them for long-term disinfection in homes and offices. Can be used in any amount.
• hypochlorite water can be stored in a warehouse as a disinfectant used in the event of a disaster.
• the hypochlorite water according to the embodiment of the present invention has an ion concentration of sodium ions of 20 ppm or less per 100 ppm of effective chlorine concentration and a silicon compound content of 20 ppb or less in terms of silicon.
• the storage stability is improved. Above all, in consideration of higher storage stability, 10 ppb or less is preferable, and 5 ppb or less is more preferable.
• the lower limit may be 1 ppt or more so that the product can be manufactured at a realistic cost.
• the ion concentration of sodium ions may be 10 ppm or less. It can be more stable.
• the content of the silicon compound in the hypochlorite water can be measured by an argon high frequency inductively coupled plasma emission spectrophotometer in terms of silicon.
• examples of the silicon compound include known silicon compounds such as silicon dioxide and ionic silicon dioxide, that is, silicic acid and salts thereof, and silicone.
• the silicon dioxide is not particularly limited in any form, and any form such as quartz or silica is applicable, and the surface-treated silicon dioxide is also included.
• the mechanism of action by which the silicon compound affects the storage stability of hypochlorous acid water is not clear, but the silicon atom of the silicon compound acts as an active point for decomposing hypochlorous acid and decomposes hypochlorous acid. It is presumed that the storage stability of hypochlorous acid water will decrease due to the promotion of.
• the content of the silicon dioxide can be calculated by the following method.
• the content (A) of silicic acid, which is ionic silica, and a salt thereof is calculated by using the molybdenum blue extraction absorptiometry described in JIS K 0101 44.1.3. Subsequently, using the molybdenum blue absorptiometry described in JIS K 0101 44.2, nonionic silicon dioxide is ionized, and the content (B) of the ionized silica is calculated. At this time, the content (B) also includes the content (A) of silicic acid, which is an ionic silica, and a salt thereof. Therefore, the content of nonionic silicon dioxide can be calculated as the difference between the content (B) and the content (A).
• the hypochlorous acid water of the present invention has a specific surface area of 0.1 m 2 / g or more and an average particle diameter of 100 ⁇ m or less when the silicon dioxide is present in the hypochlorous acid water in a solid state. It is preferable not to contain as much as possible.
• silicon dioxide having the above-mentioned specific surface area and average particle size is contained, the number of silicon atoms on the surface of silicon dioxide, which is an active point for decomposing hypochlorous acid, increases, and hypochlorous acid molecules are rapidly decomposed. It is not preferable because the storage stability of hypochlorous acid water is significantly reduced.
• the specific surface area of silicon dioxide can be measured by the nitrogen adsorption method. Further, as the average particle size of silicon dioxide, the median diameter (Dv50) on a volume basis is used. Dv50 can be obtained by measurement with a laser diffraction type particle size distribution measuring device or observation with an electron microscope.
• the method for producing hypochlorite water of the present invention is not particularly limited as long as it is a method having a silicon compound content specified in the present invention, and a known method may be adopted.
• a method of exchanging cations with a hypochlorite aqueous solution with a cation exchange resin, a method of electrolyzing salt solution or dilute hydrochloric acid, a method of adding dilute hydrochloric acid to a hypochlorite aqueous solution, etc. Can be obtained.
• hypochlorite water having the content of the silicon compound specified in the present invention the raw materials of hypochlorite water such as water, salt, hypochlorite and dilute hydrochloric acid to be used are used as these raw materials. It is preferable to adjust the total content of the contained silicon compounds to be the content of the silicon compound specified in the present invention.
• the raw material water since other raw materials may inevitably contain a silicon compound, it is preferable to use ultrapure water containing no silicon compound or distilled water having an extremely low content of the silicon compound.
• aqueous solution obtained by dissolving each raw material in ultrapure water or distilled water to the concentration at the time of producing hypochlorite water is added to argon. It is preferable to use a raw material whose total content of silicon compounds is adjusted to 1 pt or more and 20 ppb or less in terms of silicon as measured by a high-frequency induction coupled plasma emission spectroscopic analyzer. As long as the content of the silicon compound is within the above range, the raw materials such as salt, hypochlorite, and dilute hydrochloric acid may be any grade of Japanese Pharmacopoeia, food, reagent, or industrial.
• the production equipment such as reaction vessels and pipes used in the production of hypochlorite water does not contain a silicon compound.
• a metal containing a silicon compound, a metal surface-coated with a silicon compound, or silicone in a manufacturing apparatus such as a reaction vessel or a pipe.
• the hypochlorite water obtained by the above-mentioned production method may be stored in any container, and examples of the container include a plastic container and an aluminum pouch container.
• the material is not particularly limited, but polyolefin, especially polyethylene or polypropylene, is preferable from the viewpoint of being less susceptible to oxidation by hypochlorous acid.
• the container does not contain the silicon compound.
• the antiblocking agent added or coated on the film does not contain a silicon compound.
• the light-shielding method is not particularly limited, and a known method may be adopted.
• a method of adding an inorganic pigment such as Bengara or titanium white, or a material having a light-shielding ability (for example,). , Aluminum foil, etc.) to cover the container in the case of a plastic container, it is preferable that the material on the inner surface of the container that comes into contact with the hypochlorous acid water does not contain the pigment as much as possible so that the decomposition of hypochlorous acid is not promoted by the pigment.
• the content of the pigment of the material on the inner surface of the container that comes into contact with the hypochlorite water is 0.01% by mass or less
• the container is made into a plurality of layers
• the layer on the inner surface of the container does not contain the pigment.
• a method such as impregnating the outer surface of the container with an inorganic pigment or covering the outer surface of the container with a light-shielding film containing aluminum foil or the like may be adopted.
• the ion concentration of sodium ions per 100 ppm of effective chlorine concentration is 20 ppm or less
• the content of the silicon compound is 20 ppb or less in terms of silicon.
• the content of zinc and the zinc compound is 1 ppb or less in terms of zinc
• the content of zinc oxide and zinc hydroxide is 0.1 ppb or less in terms of zinc.
• the storage stability is further improved. Above all, 0.5 ppb or less is preferable in consideration of higher storage stability.
• the lower limit may be 1 ppt or more so that the product can be manufactured at a realistic cost.
• the content of zinc and zinc compounds in hypochlorite water can be measured by an argon high frequency inductively coupled plasma emission spectrophotometer in terms of zinc.
• examples of the zinc compound include zinc oxide, zinc hydroxide, zinc chloride, zinc sulfate, zinc nitrate and the like.
• zinc oxide and zinc hydroxide have a large effect on storage stability, so zinc oxide is used.
• the content of zinc hydroxide should be 0.1 ppb or less in terms of zinc.
• the form of zinc oxide and zinc hydroxide in hypochlorous acid water is not particularly limited.
• the content of zinc oxide and zinc hydroxide can be calculated by the following method.
• Hypochlorite water and a weakly acidic cation exchange resin (Amberlite IRC-76 (manufactured by Organo Co., Ltd.) are placed in a glass container and stirred at 25 ° C for 30 minutes with a fluororesin stirring blade made of polytetrafluoroethylene. Mix to remove zinc ions in the hypochlorite water. Then, leave it to stand until the weakly acidic cation exchange resin settles, and decantate the hypochlorite water, which is the supernatant, with a polypropylene # 200 filter cloth to prevent the weakly acidic cation exchange resin from entering. Collect through.
• a weakly acidic cation exchange resin Amberlite IRC-76 (manufactured by Organo Co., Ltd.)
• a mixed solution of ammonium chloride and aqueous ammonia was added to the obtained supernatant solution of hypochlorite water to dissolve zinc oxide and zinc hydroxide in the hypochlorite water, and the amount of dissolved zinc oxide and zinc hydroxide was dissolved. Is calculated by the polarograph method.
• hypochlorite water of the present invention is not particularly limited as long as it has a zinc and zinc compound specified in the present invention, or a method having a zinc oxide and zinc hydroxide content, and a known method may be adopted. It's fine.
• hypochlorite water can be obtained by a method of cation exchange of a hypochlorite aqueous solution with a cation exchange resin, a method of adding dilute hydrochloric acid to the hypochlorite aqueous solution, and the like.
• the content of zinc and zinc compounds contained in hypochlorite water is contained. May exceed 1 ppb, so it may be necessary to prevent elution from the electrode or to separately remove zinc and zinc compounds.
• hypochlorite water which is the content of zinc and zinc compound specified in the present invention and the content of zinc oxide and zinc hydroxide
• the water used, hypochlorite, dilute hydrochloric acid and the like are used.
• the total content of zinc and zinc compounds contained in the raw material of hypochlorite water is the content of zinc and zinc compounds specified in the present invention, and the content of zinc oxide and zinc hydroxide specified in the present invention. It is preferable to adjust the amount.
• the raw material water since other raw materials may inevitably contain zinc and zinc compounds, use zinc, ultrapure water containing no zinc compounds, or distilled water having an extremely low content of zinc and zinc compounds. Is preferable.
• the raw materials such as hypochlorite and dilute hydrochloric acid other than water are aqueous solutions obtained by dissolving the raw materials in ultrapure water or distilled water so as to have the concentration at the time of producing hypochlorite water. It is preferable to use a raw material whose content of zinc and zinc compound is measured by a plasma emission spectroscopic analyzer and the content of zinc and zinc compound is adjusted to be 1 ppt or more and 1 ppb or less in terms of zinc.
• raw materials such as hypochlorite and dilute hydrochloric acid if the content of zinc and zinc compound and the content of zinc oxide and zinc hydroxide can be adjusted within the above range, it is for Japanese Pharmacy, food, reagents, and industrial use. Any grade may be used.
• the production equipment such as reaction vessels and pipes used in the production of hypochlorite water does not contain zinc or zinc compounds.
• zinc, metals containing zinc compounds, and galvanized metals are preferably not used in manufacturing equipment such as reaction vessels and pipes.
• the hypochlorite water obtained by the above-mentioned production method may be stored in any container, and examples of the container include a plastic container and an aluminum pouch container.
• the material is not particularly limited, but polyolefin, especially polyethylene or polypropylene, is preferable from the viewpoint of being less susceptible to oxidation by hypochlorous acid. Further, in order to prevent zinc and zinc compounds from being mixed from these containers, it is preferable that the container does not contain zinc and zinc compounds.
• the light-shielding method is not particularly limited, and a known method may be adopted.
• a method of adding a pigment such as Bengara or titanium white, or a material having a light-shielding ability for example, a material having a light-shielding ability.
• a method of covering the container with aluminum foil or the like) can be mentioned.
• the material on the inner surface of the container that comes into contact with the hypochlorous acid water does not contain the pigment as much as possible so that the decomposition of hypochlorous acid is not promoted by the pigment.
• the content of the pigment of the material on the inner surface of the container that comes into contact with the hypochlorite water is 0.01% by mass or less
• the container is made into a plurality of layers
• the layer on the inner surface of the container does not contain the pigment.
• a method such as impregnating the outer surface of the container with a pigment or covering the outer surface of the container with a light-shielding film containing aluminum foil or the like may be adopted.
• the hypochlorite water according to the above-described embodiment of the present invention contains zinc and zinc compounds, particularly zinc oxide and zinc hydroxide, which are one of the factors affecting the storage stability of the hypochlorite water. By suppressing the amount to a specific concentration or less, it has the feature of high storage stability. As a result, hypochlorous acid is retained for a long period of time, so that high bactericidal ability can be maintained.
• hypochlorous acid that is, the decomposition of hypochlorous acid is likely to occur in the neutral range where the pH of hypochlorous acid water is around 7.0 (non-patent documents). 1).
• hypochlorite water containing zinc oxide and zinc hydroxide a part of the zinc oxide reacts with water (ZnO + H 2 O ⁇ Zn (OH) 2 ) to zinc hydroxide.
• this zinc hydroxide and the zinc hydroxide react with hydrogen chloride produced by the disproportionation reaction of hypochlorite (2HClO ⁇ 2HCl + O 2 ) (Zn (OH) 2 + 2HCl ⁇ ZnCl 2 + 2H 2 O). It is presumed that the storage stability will be extremely low because the hydrogen ion concentration in the hypochlorite water will decrease and the pH of the hypochlorite water will be in the neutral range of around 7.0 due to the deprivation of hydrogen ions. There is.
• the pH of the hypochlorite water of the present invention is preferably 6.5 or less.
• the effective chlorine concentration of hypochlorous acid is not particularly limited, but may be, for example, 50 ppm or more and 1000 ppm or less, assuming a concentration to be sold, stored, and used. Above all, when assuming a concentration to be used particularly, the effective chlorine concentration of hypochlorous acid is preferably 50 ppm or more and 250 ppm or less, and more preferably 70 ppm or more and 150 ppm or less.
• hypochlorite water of the present invention will be described with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.
• the raw materials used and the measuring method are as follows.
• the lower limit of detection of zinc ions generated by dissolving zinc oxide and zinc hydroxide is 0.1 ppb, that is, the content of zinc oxide and zinc hydroxide in hypochlorite water according to this method.
• the lower limit of detection is 0.1 ppb.
• Measurement method of effective chlorine concentration It was measured at room temperature (25 ° C ⁇ 1 ° C) with the effective chlorine concentration measurement kit AQ-202P (manufactured by Sibata Scientific Technology Co., Ltd.).
• PH measurement method It was measured at room temperature (25 ° C ⁇ 1 ° C) with a pH meter F-55 type (manufactured by HORIBA, Ltd.).
• Ultrapure water Ultrapure water produced by an ultrapure water production device (Direct-Q UV3 (manufactured by Merck & Co., Ltd.)) was used. As a result of measuring the content of the silicon compound in terms of silicon, the silicon compound was not contained. Moreover, as a result of measuring the content of zinc, zinc compound, zinc oxide and zinc hydroxide in terms of zinc, it was less than the lower limit of detection, that is, the content was less than 0.1 ppb.
• Tap water The tap water that is normally used was used. As a result of measuring the content of the silicon compound in terms of silicon, it was 5400 ppb. Moreover, as a result of measuring the content of zinc and the zinc compound in terms of zinc, it was 120 ppb.
• Ion-exchanged water Ion-exchanged water produced by a cartridge deionizer (G-10D (manufactured by Organo)) was used.
• G-10D manufactured by Organo
• As a result of measuring the contents of zinc oxide and zinc hydroxide in terms of zinc it was less than the lower limit of detection, that is, the content was less than 0.1 ppb.
• Sodium hypochlorite aqueous solution An aqueous solution of sodium hypochlorite having an effective chlorine concentration of 12.0 wt% (Neolax Super (manufactured by Shimada Shoten Co., Ltd.)) was used. When diluted with ultrapure water to an effective chlorine concentration of 10,000 ppm, the content of the silicon compound in terms of silicon was measured and found to be 3 ppb. Similarly, when diluted with ultrapure water to an effective chlorine concentration of 10,000 ppm, the content of zinc and zinc compounds in terms of zinc was measured and found to be 0.4 ppb. As a result of measuring the contents of zinc oxide and zinc hydroxide in terms of zinc, it was less than the lower limit of detection, that is, the content was less than 0.1 ppb.
• Example 1 hypochlorous acid water was produced by a cation exchange method using the following raw materials. 100 mL of an aqueous sodium hypochlorite solution was placed in a polyethylene container, and ultrapure water was added to dilute it to an effective chlorine concentration of 10,000 ppm. Subsequently, 100 mL of a weakly acidic cation exchange resin (Amberlite IRC-76 (manufactured by Organo Co., Ltd.)) was added, and the weakly acidic cation exchange resin was uniformly dispersed at 25 ° C. with a fluororesin stirring blade made of tetrafluoroethylene. The mixture was stirred and mixed.
• a weakly acidic cation exchange resin Amberlite IRC-76 (manufactured by Organo Co., Ltd.)
• hypochlorite water was produced through a filter cloth.
• the content of the silicon compound in terms of silicon in the produced hypochlorite water it was 3 ppb.
• the content of zinc and the zinc compound in terms of zinc it was 0.2 ppb.
• the contents of zinc oxide and zinc hydroxide in terms of zinc it was less than the lower limit of detection, that is, the content was less than 0.1 ppb.
• the pH was 4.5.
• Comparative Example 4 hypochlorite water was produced by the hydrochloric acid method using the following raw materials. 100 mL of an aqueous sodium hypochlorite solution was placed in a polyethylene container, and ultrapure water was added to dilute it to an effective chlorine concentration of 10,000 ppm. Subsequently, 60 mL of 1 mol / L hydrochloric acid was added and stirred at 25 ° C. with a tetrafluoroethylene fluororesin stirring blade to produce hypochlorite water. As a result of measuring the content of the silicon compound in terms of silicon in the produced hypochlorite water, it was 3 ppb.
• Example 5 Hypochlorite water was produced using the same raw materials and the same production method as in Example 1 except that ion-exchanged water having an ion conductivity of 3 (mS / m) or less was used instead of ultrapure water.
• ion-exchanged water having an ion conductivity of 3 (mS / m) or less was used instead of ultrapure water.
• the content of the silicon compound in terms of silicon in the produced hypochlorite water it was 630 ppb.
• the content of zinc and the zinc compound in terms of zinc it was 2 ppb.
• As a result of measuring the contents of zinc oxide and zinc hydroxide in terms of zinc it was less than the lower limit of detection, that is, the content was less than 0.1 ppb.
• the pH was 5.5.
• Example 1 Assuming the effective chlorine concentration of the manufactured hypochlorite water that is sold, stored, and used as a disinfectant or disinfectant, dilute each with water to an effective chlorine concentration of 100 ppm, and store stability by the following method. It was confirmed.
• Example 1 Comparative Example 1, Comparative Example 3, and Comparative Example 4, ultrapure water was used for dilution, and in Comparative Example 2, tap water (silicon compound in terms of silicon) was used for dilution assuming use in a home or office.
• Comparative Example 5 ion-exchanged water having an ion conductivity of 3 (mS / m) or less was used.
• the ion concentration of sodium ion was 5 ppm
• the content of silicon compound in terms of silicon was 0.03 ppb
• the content of zinc and zinc compound in terms of zinc was 0.
• the content of zinc oxide and zinc hydroxide in terms of zinc was less than 1 ppb (calculated value of about 0.002 ppb), and the content of zinc oxide and zinc hydroxide was less than 0.1 ppb (calculated value of less than 0.001 ppb).
• the diluted solution of hypochlorite water of Comparative Example 1 has an ion concentration of sodium ion of 5 ppm, a silicon compound content of 48 ppb in terms of silicon, zinc and a zinc compound in zinc equivalent of 120 ppb, and a zinc equivalent.
• the content of zinc oxide and zinc hydroxide in was 30 ppb.
• the diluted solution of hypochlorite water of Comparative Example 2 has an ion concentration of sodium ion of 5 ppm, a silicon compound content of 5400 ppb in terms of silicon, zinc and a zinc compound in zinc equivalent of 120 ppb, and a zinc equivalent.
• the content of zinc oxide and zinc hydroxide in was 30 ppb.
• Example 3 A silicon compound (silicon dioxide, leolosea QS-102 (specific surface area 100 m 2 / g, average particle size (Dv50) 1 ⁇ m) was added to 100 g of the hypochlorite water of Example 1 diluted with ultrapure water to an effective chlorine concentration of 100 ppm. The same operation as in Example 1 was carried out except that 0.1 g) was added (manufactured by Tokuyama Corporation), and the storage stability was confirmed.
• the ion concentration of sodium ion is 5 ppm
• the content of silicon compound in terms of silicon is 470000 ppb
• the content of zinc in terms of zinc and zinc compound is less than 0.1 ppb (calculated value is about 0.002 ppb), in terms of zinc.
• the content of zinc oxide and zinc hydroxide was less than 0.1 ppb (calculated less than 0.001 ppb).
• the ion concentration of sodium ion was 100 ppm
• the content of silicon compound in terms of silicon was 0.03 ppb
• the content of zinc and zinc compound in terms of zinc was 0.
• the content of zinc oxide and zinc hydroxide in terms of zinc was less than 1 ppb (calculated value of about 0.002 ppb), and the content of zinc oxide and zinc hydroxide was less than 0.1 ppb (calculated value of less than 0.001 ppb).
• the diluted solution of hypochlorite water of Comparative Example 5 has an ion concentration of sodium ion of 5 ppm, a silicon compound content of 630 ppb in silicon equivalent, zinc and zinc compound content of zinc equivalent of 2 ppb, and zinc equivalent.
• the content of zinc oxide and zinc hydroxide in was less than 0.1 ppb.
• hypochlorite water diluted to an effective chlorine concentration of 100 ppm with water was placed in a polyethylene container and stored in the polyethylene container.
• This polyethylene container is composed of two layers, and the outer surface of the container contains titanium white and has a light-shielding property, but the inner surface of the container does not contain components such as pigments that promote the decomposition of hypochlorous acid. board.
• hypochlorite water of Example 1 maintains a high effective chlorine concentration of 96 ppm or more even after storage at 50 ° C. for 30 days, and the storage stability is high. Do you get it.
• hypochlorite water of Comparative Example 1 had a low effective chlorine concentration of 80 ppm and low storage stability. From this result, it is presumed that the decomposition of hypochlorous acid is promoted when a large amount of silicon compound is contained in the hypochlorous acid water.
• the effective chlorine concentration of the hypochlorite water of Comparative Example 2 was lower than 67 ppm. Since the hypochlorous acid water contains a larger amount of silicon compounds, it is presumed that the decomposition of hypochlorous acid is further promoted.
• hypochlorite water of Comparative Example 4 had a low effective chlorine concentration of 72 ppm and low storage stability. From this result, it is presumed that even if the hypochlorous acid water does not contain silicon compounds, zinc compounds, etc., the decomposition of hypochlorous acid is promoted when a large amount of sodium ions are contained.
• hypochlorite water of Comparative Example 5 had a low effective chlorine concentration of 87 ppm and low storage stability. From this result, it is presumed that the decomposition of hypochlorous acid is promoted when a large amount of silicon compound is contained in the hypochlorous acid water.

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