JP2002205067A - Washing water having sterilizing ability and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide washing water having sterilizing action and washing action and being hot weakly acid electrolytic water obtained by mixing strongly acid electrolytic water with strongly alkaline electrolytic water. SOLUTION: This washing water having sterilizing ability at pH 3.0-7.5 at normal temperature to 70 deg.C is obtained by mixing at high temperature the strongly alkaline electrolytic water produced by diaphragmatic electrolysis by using an aqueous solution of chloride salt as the water to be electrolyzed in the strongly acid electrolytic water produced by diaphragmatic electrolysis by using the aqueous solution of chloride salt as the water to be electrolyzed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing water having a sterilizing ability comprising a strongly acidic electrolyzed water and a strongly alkaline electrolyzed water electrolyzed using an aqueous solution of a chloride salt as water to be electrolyzed, and
The present invention relates to a method for producing the washing water.

[0002]

2. Description of the Related Art In a diaphragm electrolysis using an aqueous solution in which a chloride salt such as sodium chloride, sodium chloride or sodium chloride, potassium chloride, calcium chloride or the like is dissolved as water to be electrolyzed,
The strongly acidic electrolyzed water and the strongly alkaline electrolyzed water are generated in a state where they are separated from each other. Among these electrolyzed waters, strongly acidic electrolyzed water is used as a germicidal water in various fields because it has a high bactericidal action, and strongly alkaline electrolyzed water is used as a rinsing water in various fields because it has a high rinsing action. It's being used.

[0003] Therefore, it is presumed that the electrolyzed water obtained by combining the strongly acidic electrolyzed water and the strongly alkaline electrolyzed water with each other has both excellent sterilizing action and cleaning action, and simultaneously sterilizes and cleans the object to be cleaned. Wash water that can be done,
Its provision is required as washing water having a sterilizing ability. In order to cope with this demand, a means for mixing the strongly acidic electrolyzed water and the strongly alkaline electrolyzed water at an appropriate ratio or a means for maintaining the temperature at a high temperature in order to enhance the washing action of the mixed water can be considered. . However, such a simple mixing means loses the high bactericidal action of the strongly acidic electrolyzed water, so that it is not possible to produce washing water having a high bactericidal ability.

[0004]

The bactericidal action of the strongly acidic electrolyzed water has been recognized as being caused by a chlorine component present in the electrolyzed water, so-called available chlorine. It exists in various different forms in different regions, and the bactericidal action is greatly different in the regions having different pH. Fig. 1 shows the pH of chlorine components present in electrolyzed water.
FIG. 4 is a graph showing the morphology in the region, where the chlorine component is abundant in the form of Cl _{2 in} the low region where the pH is less than 3.0, and is HOCl in the intermediate region where the pH is 3.0 to 7.5.
Many in the form, at high region pH exceeds 7.5 OCl ^- are present much in forms.

[0005] Of these forms, the chlorine component is HOCl
In its form, it exhibits the highest bactericidal action. Further, the chlorine component, low bactericidal action in the form of Cl _2, also, OCl ^-
Lower bactericidal action in the form of, and, OCl ^- forms a problem of high residual resistance to the object to be cleaned. Also,
When the strongly acidic electrolyzed water is brought to a high temperature state, the chlorine component volatilizes in the form of Cl ₂ and gradually decreases, and the strongly acidic electrolyzed water gradually reduces the bactericidal action. On the other hand, the washing action of the strongly alkaline electrolyzed water is greatly affected by the temperature, and in order to improve the washing action, it is preferable to keep the strongly alkaline electrolyzed water at a high temperature.

[0006] Therefore, in order to produce cleaning water having a sterilizing ability and a high detergency, simply preparing a mixture of strongly acidic electrolyzed water maintained at a high temperature and strongly alkaline electrolyzed water maintained at a high temperature. However, even if the produced washing water can be adjusted to an appropriate pH range, the chlorine component volatilizes in the form of Cl ₂ due to the effect of the temperature during the preparation process, and the washing water greatly reduces its sterilizing action. Will decrease.

To cope with these problems, an acidic aqueous solution obtained by dissolving an acid such as hydrochloric acid in an aqueous solution of a chloride salt is employed as the water to be electrolyzed.
A production method has been proposed in which weakly acidic electrolyzed water before and after is produced. However, in the production method, there is a problem that the cost of the water to be electrolyzed is high and the running cost of the production of the electrolyzed water is greatly increased, and the strong alkaline electrolyzed water having a high cleaning action can be generated alone. There is no problem.

Accordingly, an object of the present invention is to provide a washing water having a high bactericidal action with a weakly acidic electrolyzed water obtained by mixing a strongly acidic electrolyzed water and a strongly alkaline electrolyzed water. It is to provide washing water having.

[0009]

SUMMARY OF THE INVENTION The present invention relates to washing water having a sterilizing ability and a method for producing the same. Thus, the washing water according to the present invention is a strong acid electrolyzed water generated by a diaphragm electrolysis using an aqueous solution of a chloride salt as an electrolyzed water, and a diaphragm electrolysis using an aqueous solution of a chloride salt as an electrolyzed water. This is weakly acidic washing water obtained by mixing the generated strongly alkaline electrolyzed water in a high temperature state, and has a pH of 3.0 to 7.0.
5, wherein the temperature is in the range of room temperature to 70 ° C.

[0010] Further, the method for producing washing water according to the present invention comprises:
A strong alkaline electrolyzed water produced by diaphragm electrolysis using an aqueous solution of a chloride salt as an electrolyzed water is heated in a storage tank and kept at 70 ° C. or lower to prepare a warm strongly alkaline electrolyzed water,
This warm strongly alkaline electrolyzed water is mixed with strongly acidic electrolyzed water generated by diaphragm electrolysis using an aqueous solution of a chloride salt as water to be electrolyzed, and the pH is in the range of 3.0 to 7.5 and the temperature is room temperature. ~ 7
It is characterized by being prepared in warm and weak acidic water in the range of 0 ° C.

[0011]

The washing water according to the present invention has a high sterilizing action and a high washing action under mildly acidic conditions. The washing water can be stored in a sink and used in a stirred state, or can be sprayed in a shower or the like. Even in various use modes such as a mode of use in a state, the effective chlorine is not volatilized, the stable characteristics are maintained, and both the high sterilizing action and the cleaning action are exhibited.
In these use modes, since the washing water is weakly acidic, not strongly acidic or strongly alkaline, it has a gentle effect on the user and has no adverse effect on the user.

Further, in the method for producing washing water according to the present invention, the strongly alkaline electrolyzed water is heated and kept in a storage tank, and the heated strongly alkaline electrolyzed water is mixed with the strongly acidic electrolyzed water. A means for adjusting the temperature to a weakly acidic water having a pH in the range of 3.0 to 7.5 and a temperature in the range of room temperature to 70 ° C. is employed. Therefore, at the time of preparation of the weakly acidic water, the chlorine component contained in the strongly acidic electrolyzed water is less volatilized, and sufficient available chlorine can be left. For this reason, the washing water, which is a weakly acidic water, has a high bactericidal action due to the residual effective chlorine contained in the strongly acidic electrolyzed water, and also due to the residual washing action of the strongly alkaline electrolyzed water. It has a high cleaning action.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The washing water according to the present invention has a high sterilizing action and a high washing action under mildly acidic conditions.
It is prepared by mixing strongly acidic electrolyzed water and strongly alkaline electrolyzed water separated from each other by diaphragm electrolysis using an aqueous solution of a chloride salt as water to be electrolyzed. In the present invention, as a chloride salt for preparing the water to be electrolyzed,
Any of or a combination of sodium chloride, sodium chloride-based salt, potassium chloride, calcium chloride and the like can be appropriately employed. In the present embodiment,
It is implemented using salt.

In this embodiment, the concentration of the salt is 0.1 to
It is a 1.0% by weight diluted saline solution, and the strongly acidic electrolyzed water and the strongly alkaline electrolyzed water shown in Table 1 are generated by diaphragm electrolysis using the diluted saline as the water to be electrolyzed. Washing water is manufactured by mixing alkaline electrolyzed water to prepare warm and weak acidic water.

[0015]

[Table 1]

In the present embodiment, the strong alkaline electrolyzed water generated by the diaphragm electrolysis is temporarily stored in a storage tank and heated, and the warm strong alkaline electrolyzed water kept at a temperature of 70 ° C. or less is subjected to strong acidic electrolysis. Add the water to the set amount and mix. In this case, the addition amount of the strong strongly alkaline electrolyzed water to the strongly acidic electrolyzed water is 30 per 100 mL of the strongly acidic electrolyzed water.
mL-90 mL. Thereby, the pH becomes 3.0 to 3.0.
At 7.5, washing water, which is a weakly acidic water having a temperature in the range of room temperature to 70 ° C., is produced.

In the present embodiment, the supply system for supplying the cleaning water to the place of use is provided in the system for producing the cleaning water, and the strong alkaline electrolyzed water alone is supplied to the place of use. And a supply path for supplying the strongly acidic electrolyzed water alone to the place of use. Therefore, in the washing water production system, sterilization and washing treatment by using the washing water, sterilization treatment on the low acid side by using strongly acidic electrolyzed water alone, and high alkalinity by using strongly alkaline electrolyzed water alone. It is possible to perform three kinds of processing of the cleaning processing on the side.

[0018]

EXAMPLE In this example, strongly acidic electrolyzed water (pH 2.
6), acidic electrolyzed water (pH 3.0), weakly acidic electrolyzed water (pH
5.1) and an experiment (Experiment 1) for examining the change over time of the volatile state of the chlorine component in the aqueous sodium hypochlorite solution, and mixing strongly acidic electrolyzed water and strongly alkaline electrolyzed water. An experiment (Experiment 2) for examining an appropriate amount of strongly alkaline electrolyzed water to be added to strongly acidic electrolyzed water when preparing warm and weakly acidic water was performed.

(Experiment 1): In this experiment, as the electrolyzed water,
Strongly acidic electrolyzed water (pH 2.6), acidic electrolyzed water (pH 3.
0), a weakly acidic electrolyzed water (pH 5.1), and an aqueous solution of sodium hypochlorite (pH 8.9), and the electrolyzed water and the aqueous solution are left open at 50 ° C.,
The sample was allowed to stand, and the amount of change in the remaining chlorine component at regular intervals was measured. The obtained results are shown in Table 2 and graphically in FIG. Note that an ortho-tolidine measurement method was employed for measuring the chlorine component.

The strongly acidic electrolyzed water (pH 2.
6) is strongly acidic electrolyzed water generated by diaphragm electrolysis using diluted saline as electrolyzed water, which is heated and maintained at 50 ° C. The aqueous sodium hypochlorite solution (pH 8.9) is prepared by adding a reagent of sodium hypochlorite to pure water, and is heated and maintained at 50 ° C.

The acidic electrolyzed water (pH
3.0) is a mixture prepared by mixing strongly acidic electrolyzed water and strongly alkaline electrolyzed water generated by diaphragm electrolysis using diluted saline as electrolyzed water, and is heated and maintained at a predetermined temperature. Strong alkaline electrolyzed water (temperature strong alkaline electrolyzed water)
Was added to strongly acidic electrolyzed water at room temperature, and pH 3.0 at 50 ° C.
It is prepared to be acidic. The weakly acidic electrolyzed water (pH 5.1) used in this experiment was also prepared by the same means, and was heated to a strong alkaline electrolyzed water (temperaturely strong alkaline electrolyzed water) maintained at a predetermined temperature. water)
Was added to strongly acidic electrolyzed water at room temperature, and pH 5.1 at 50 ° C.
Is prepared to be slightly acidic. In preparing these acidic electrolyzed water (pH 3.0) and weakly acidic electrolyzed water (pH 5.1), in order to suppress the volatilization of the chlorine component in the strongly acidic electrolyzed water, the strong and strongly alkaline electrolyzed water maintained at a high temperature is used. Is added to the strongly acidic electrolyzed water to balance the weak acidification of the strongly acidic electrolyzed water and the rise in temperature, thereby suppressing the volatilization of the chlorine component.

[0022]

[Table 2]

Referring to Table 2 and the graph of FIG. 2, if the pH of the electrolyzed water is 3.0, even if the electrolyzed water is left for a long time, a large amount of chlorine component is contained in the acidly electrolyzed water. It remains and retains the form of HOCl (effective chlorine) that exerts a bactericidal action. The pH range in which the chlorine component retains the HOCl form in which the chlorine component exerts a bactericidal action is shown in the graph of FIG. 1, but when the electrolyzed water has a pH of 3.0, the HOCl form is retained at a high rate. Also, the pH of the electrolyzed water
Is 5.1, the residual amount of chlorine component (available chlorine amount) after being left for a long time is greater than when the pH is 3.0. Referring to the graph of FIG. 1, the upper limit of the pH value is pH 7.5, at which the proportion of HOCl in which the chlorine component exerts a bactericidal action is high.

Accordingly, the cleaning water having a high bactericidal action and a cleaning action and having a bactericidal ability intended by the present invention is p
H is preferably in the range of 3.0 to 7.5, and particularly preferably the pH is in the range of 4.0 to 6.0. In addition, in this invention, pH is 3.0-7.
The electrolyzed water in the range of 5 is called weakly acidic electrolyzed water. Regarding the temperature of the weakly acidic electrolyzed water, it is in the range of room temperature to 70 ° C.,
This temperature range is a good range of the cleaning effect in use as the cleaning water, and is a temperature range for the cleaning operation.

(Experiment 2): This experiment is an experiment for examining an appropriate amount of strongly alkaline electrolyzed water to be added to strongly acidic electrolyzed water when preparing warm and weakly electrolyzed water. .6) and strongly alkaline electrolyzed water (pH 11.
4) Using strongly acidic electrolyzed water (pH 2.6) 1 at room temperature
In 00 mL, add a set volume (mL) of strongly alkaline electrolyzed water heated to and maintained at 50 ° C., and add p.
Changes in H, water temperature, and available chlorine (mg / L) were measured. Table 3 shows the obtained results. In addition, the ortho-tolidine measurement method was used for the measurement of the chlorine component.

[0026]

[Table 3]

Referring to Table 3, when adding strongly alkaline electrolyzed water (pH 11.4) at 50 ° C. to 100 mL of strongly acidic electrolyzed water (pH 2.6) at room temperature, 30 mL of strongly alkaline electrolyzed water was added. The pH becomes 3.0 or more when added, and the pH becomes 7.8 by adding 90 mL of strongly alkaline electrolyzed water. That is, strongly acidic electrolyzed water (p
H2.6) 100 ml of strongly alkaline electrolyzed water (p
The appropriate addition amount of H11.4) is in the range of 30 mL to 90 mL. In the pH range of this range, the available chlorine amount is 27 mL to 18 mL, and the value in this range is a value having a sufficient bactericidal action.

In the case of diaphragm electrolysis using diluted saline as the water to be electrolyzed, by changing the electrolysis conditions such as the concentration of the electrolyzed water, the electrolysis current value, and the electrolysis time, different characteristics are obtained according to the change in the electrolysis conditions. Strongly acidic electrolyzed water and strongly alkaline electrolyzed water are generated. However, since strongly acidic electrolyzed water and strongly alkaline electrolyzed water generated by diaphragm electrolysis under the same electrolysis conditions are always almost in relative relation, they are produced by diaphragm electrolysis under the same electrolysis conditions. When weakly acidic electrolyzed water is prepared by employing strongly acidic electrolyzed water and strongly alkaline electrolyzed water, the appropriate range of the mixing amount is the above range, that is, the strongly alkaline electrolyzed water with respect to 100 mL of strongly acidic electrolyzed water. Approximately in the range of 30 mL to 90 mL.

[Brief description of the drawings]

FIG. 1 is a graph showing the pH of electrolyzed water, the form of chlorine components present in the electrolyzed water, and the abundance thereof.

FIG. 2 is a graph showing the change over time in the volatilization state of chlorine components when each of the electrolyzed water and the aqueous solution is left at a water temperature of 50 ° C.

Claims (2)

[Claims] 1. A strongly alkaline electrolytic solution produced by diaphragm electrolysis using an aqueous solution of a chloride salt as electrolyzed water and a strongly acidic electrolyzed water produced by diaphragm electrolysis using an aqueous solution of a chloride salt as electrolyzed water. Washing water obtained by mixing water at a high temperature.
Wherein the temperature is in the range of 3.0 to 7.5 and the temperature is in the range of normal temperature to 70 ° C. 2. A strong alkaline electrolyzed water is prepared by heating a strongly alkaline electrolyzed water generated by diaphragm electrolysis using an aqueous solution of a chloride salt as water to be electrolyzed in a storage tank and keeping the temperature at 70 ° C. or lower. Then, this warm strongly alkaline electrolyzed water is mixed with strongly acidic electrolyzed water generated by diaphragm electrolysis using an aqueous solution of a chloride salt as water to be electrolyzed, and the pH is adjusted to a range of 3.0 to 7.5. Is prepared in warm and weak acidic water having a temperature in the range of room temperature to 70 ° C.