JP2004188386A - Scale inhibitor for bathroom water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scale inhibitor for bathroom water which, even if bathroom water contains a large amount of calcium, manganese and the like, can efficiently remove the scale components, or prevent scale adhesion. <P>SOLUTION: The scale inhibitor mainly comprises gluconic acid, a salt of gluconic acid, and a salt of metaphosphoric acid. Sodium metaphosphate or potassium metaphosphate is preferably used as the salt of metaphoshoric acid for the scale inhibitor described in claim 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bath water scale used to remove scale that is insoluble in components dissolved in bath water and adheres to a wall surface of a bathtub or an inner surface of a pipe, or to prevent scale from adhering. Related to inhibitors.
[0002]
[Prior art]
As this kind of scale inhibitor, dilute hydrochloric acid or the like is generally widely used, but there is a drawback that it is corrosive to metals and has a bad influence on the human body, so that its handling is difficult.
Therefore, as a scale inhibitor having little effect on the human body, a drug containing 1-hydroxyethylidene-1,1-diphosphonic acid (hereinafter referred to as HEDP) as a main component has been proposed. It is sold under the name Diquest (trade name).
[0003]
[Problems to be solved by the invention]
However, when the bath water contains a large amount of scale components, especially calcium and magnesium as in some hot spring waters, HEDP does not always provide a satisfactory scale prevention effect. This leaves room for improvement.
[0004]
The present invention is intended for bath water that can remove scale components more effectively or prevent scale adhesion even if a large amount of calcium or magnesium is contained in the bath water. The purpose is to provide a scale inhibitor.
[0005]
[Means for Solving the Problems]
A feature of the invention according to claim 1 is a scale inhibitor for bath water, which comprises gluconic acid or a salt of gluconic acid and a salt of metaphosphoric acid as main components.
[0006]
According to the characteristic configuration of the invention of claim 1, the scale inhibitor for bath water is composed mainly of gluconic acid or a salt of gluconic acid and a salt of metaphosphoric acid, so that the scale inhibitor can be compared with a conventional scale inhibitor. In addition, when gluconic acid is used among gluconic acid and salts of gluconic acid, better descaling and prevention effects can be expected. It can be used with little impact and with peace of mind.
In particular, as apparent from the test results described below, it is effective for hot spring water containing a large amount of calcium, magnesium, and the like, and can provide an optimal scale inhibitor for hot spring water.
[0007]
A feature of the invention according to claim 2 is that the salt of metaphosphoric acid is sodium metaphosphate or potassium metaphosphate.
[0008]
According to the characteristic feature of the invention of claim 2, since the salt of metaphosphoric acid is sodium metaphosphate or potassium metaphosphate which is a food additive, good scale can be obtained by using it in combination with gluconic acid which is a food additive. It can be used safely without impairing the removal and prevention effects and without affecting the human body.
Therefore, for example, in hot springs and commercial bath facilities, it is also possible to mix and circulate in bath water and remove scale attached to the wall surface of the bathtub or the inner surface of the pipe without closing the bath facilities. And adhesion of scale can be prevented beforehand.
[0009]
A feature of the invention according to claim 3 is that the salt of gluconic acid is sodium gluconate or potassium gluconate neutralized with sodium hydroxide or potassium hydroxide.
[0010]
According to the characteristic feature of the invention of claim 3, since the salt of gluconic acid is sodium gluconate or potassium gluconate neutralized with the food additive sodium hydroxide or potassium hydroxide, Close the bath facilities in hot springs and commercial bath facilities by mixing and circulating it in the bath water as described above without affecting the human body by using it in combination with certain sodium metaphosphate or potassium metaphosphate Without removing the scale attached to the wall surface of the bathtub or the inner surface of the pipe, the adhesion of the scale can be prevented.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The scale inhibitor for bath water according to the present invention contains gluconic acid or a salt of gluconic acid and a salt of metaphosphoric acid as main components.
As the salt of gluconic acid, for example, it is preferable to use sodium gluconate or potassium gluconate neutralized with sodium hydroxide or potassium hydroxide which is a food additive. It is preferred to use the additive sodium metaphosphate or potassium metaphosphate.
The mixing ratio between gluconic acid or a salt thereof and a salt of metaphosphoric acid is preferably set as appropriate according to the quality of the bath water to be treated and the quality of the spring, and further, the scale adhesion state, etc., and the weight ratio is preferably 1 to 1. 4: The range of 4-1 is one guideline.
[0012]
In order to confirm the effect of this bath water scale inhibitor, a comparative test was conducted with a conventional scale inhibitor. Next, the bath facilities used for the test and the test results will be described.
As shown in FIG. 1, the bath facilities used for the test include a bathtub 1 and a supply pipe 2 for supplying bath water W (new hot water) to the bathtub 1. A circulation path 4 for circulating the bath water W inside is connected.
The circulation path 4 is provided with a hair collector 5 located on the upper side of the circulation pump 3 and a filter 6 and a heat exchanger 7 located on the lower side of the circulation pump 3. A chemical injection device 8 for injecting a bath water scale inhibitor is connected to the circulation path 4 between the filter 6.
[0013]
The bath water W used in the test was hot spring water (spring quality: sodium chloride hot spring) of Minami Dogo Onsen, Ehime Prefecture. For comparison, 1-hydroxyethylidene-1,1-diphosphonic acid was used as a conventional scale inhibitor. (Indicated as HEDP in FIG. 2).
The injection of the drug by the drug injection device 8 is performed three times every day from 8:00 to 9:00, 12:00 to 13:00, and 17:00 to 18:00, and the effect of the scale removal is determined 5 days after the start of the test. Judgment was made based on the state of the scale accumulated in the upper layer of the filter medium in 6.
FIG. 2 shows the results. From this chart, it can be seen that if the gluconic acid is 2.5 g and the sodium metaphosphate is 2.5 g, that is, if the amount of the added drug is 5.0 g / m ³ or more, the scale is No adhesion was observed, 0.3 g of gluconic acid, 0.5 g of sodium metaphosphate, and 0.06 g of sodium hydroxide. That is, even when the amount of the added drug was 0.86 g / m ^3, it was almost the same as that of HEDP. It can be understood that it is effective.
[0014]
In addition, the amount X (g / m ³ ) of the chemical added to the circulating bath water W was tested using gluconic acid and sodium metaphosphate. As a result, gluconic acid was 0.1 g and sodium metaphosphate was 0.1 g. In the case of the drug No. 4, in the test described above, four lumps having a size of 40 mm were recognized, and the lumps were soft.
Thus, when the amount of the added drug is 0.2 g / m ³ , it is inferior to HEDP effectively, but has a sufficient effect as compared with no addition, and therefore, the lower limit of the added amount X of the drug to the bath water W is 0. 0.2 g / m ³ or so.
[0015]
The bath facilities used for the test are so-called circulation bath facilities, but the present invention can also be carried out in one-time bath facilities that are frequently used in hot springs, and FIG. 3 shows an example of such a bath facility. .
In the one-time bath facility shown in this figure, a supply pipe 2 for supplying bath water (hot spring water of new hot water) W to a bath tub 1 is provided with a pump 9 for pumping the bath water W at an end thereof, and a hot water storage tank in the middle. 10 and a hot water pump 11 are interposed.
A drug injection device 8 is connected to the supply pipe 2 between the water pump 9 and the hot water storage tank 10, and the scale preventing agent injected from the drug injection device 8 causes the inside surface of the supply pipe 2 and the wall surface of the bathtub 1 to move. Of the scale is prevented.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a bath facility used for an effect confirmation test. FIG. 2 is a diagram showing test results of an effect confirmation. FIG. 3 is a schematic configuration diagram of a one-time bath facility.
DESCRIPTION OF SYMBOLS 1 Bathtub 2 Supply pipe 3 Circulation pump 4 Circulation path 5 Hair collector 6 Filter 7 Heat exchanger 8 Drug injection device 9 Pumping pump 10 Hot water tank 11 Hot water pump W Bath water

Claims (3)

A scale inhibitor for bath water containing gluconic acid or a salt of gluconic acid and a salt of metaphosphoric acid as main components. 2. The scale inhibitor for bath water according to claim 1, wherein the metaphosphate salt is sodium metaphosphate or potassium metaphosphate. The scale inhibitor for bath water according to claim 1 or 2, wherein the gluconic acid salt is sodium gluconate or potassium gluconate neutralized with sodium hydroxide or potassium hydroxide.

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