JPH10324508A - Liquid composite of hydrogen peroxide and metal washing liquid composition using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow hydrogen peroxide to react mildly at the time of oxidation action, to obtain a safe liq. composite of hydrogen peroxide easy to handle and to obtain a metal washing liq. compsn. using the liq. composite by incorporating an aq. soln. of hydrogen peroxide, a weak acid and sodium dihydride dihydrate of the weak acid. SOLUTION: An aq. soln. of hydrogen peroxide, a weak acid such as boric acid, phosphoric acid or uric acid and sodium dihydride dihydrate of the weak acid are incorporated to obtain the objective liq. composite of hydrogen peroxide performing mild oxidation reaction at an ordinary temp. and capable of safe handling. The objective metal washing liq. compsn. is obtd. by incorporating the liq. composite, a washing agent consisting of sulfamic acid having etching action to a metal and phosphoric acid acting as a buffer for sulfamic acid, a chelating agent acting as a sequestering agent and having action to enhance washing power, e.g. citric acid, EDTA or fucoidan and a surfactant such as an anionic, nonionic or amphoteric surfactant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a complex solution of hydrogen peroxide and a metal cleaning solution composition using the same. More particularly, the present invention relates to a safe and easy-to-handle hydrogen peroxide complex liquid and a metal cleaning liquid composition using the same.

[0002]

2. Description of the Related Art Techniques utilizing the reaction of hydrogen peroxide are widely applied in various industries. Hydrogen peroxide has a strong oxidizing effect, and can oxidize the surface of a metal or the like and can dissociate a bond of an organic compound. In addition, oxygen gas is generated when hydrogen peroxide oxidizes and decomposes other objects.
The oxygen gas can oxidize the metal surface and at the same time, release dirt on the metal surface by the bubbles. Then, the dissociation of the bond of the organic compound can be promoted. Since hydrogen peroxide has such properties, it can be used as an oxidizing agent or a peroxide in the same manner as ozone if the method of use is appropriate.

[0003] Hydrogen peroxide is a pharmaceutical oxidol (2.
5 to 3.5 w / v% aqueous solution), which is used as a disinfectant in ordinary households and the like. On the other hand, industrial hydrogen peroxide is an aqueous solution having a concentration of 35 w / v% or more, and is a strong oxidizing agent. Hydrogen peroxide itself is not flammable, but when decomposed, generates oxygen gas and generates heat. Therefore, care must be taken to minimize the contact of hydrogen peroxide with combustibles. According to the Fire Service Law, high-concentration hydrogen peroxide is designated as dangerous substance class 6 (oxidizing liquid). According to the Poisonous and Deleterious Substances Control Law, hydrogen peroxide with a concentration of more than 6 w / v% is designated as dangerous substance. It regulates its transportation, handling, storage, and sales. And the use of hydrogen peroxide is limited to specially trained engineers.

[0004] The following can be said at present about the technology of hydrogen peroxide. Anhydrous hydrogen peroxide is a colorless viscous liquid. The presence of impurities makes them extremely unstable and sometimes decomposes explosively. The decomposition heat generated at this time gradually accumulates and further promotes the decomposition of hydrogen peroxide. Decomposition of hydrogen peroxide is promoted by heavy metals such as iron and copper and enzymes such as catalase, and is also promoted by raising the temperature or making it alkaline. Although hydrogen peroxide is easily decomposed as described above, sodium silicate has a power of suppressing the decomposition of hydrogen peroxide, and the power is doubled when magnesium ions coexist.

[0005]

As described above, hydrogen peroxide has a strong oxidizing effect and can oxidize the surface of a metal or the like and can dissociate a bond of an organic compound. In addition, oxygen gas is generated when hydrogen peroxide oxidizes and decomposes other objects. The oxygen gas can oxidize the metal surface and at the same time, release dirt on the metal surface by the bubbles. Then, the dissociation of the bond of the organic compound can be promoted. However, hydrogen peroxide is difficult to handle because the oxidation reaction is rapid. In addition, hydrogen peroxide generates oxygen gas when decomposed and generates heat at the same time, so it is dangerous to come in contact with combustibles, and its handling is limited to specially skilled engineers. .

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a safe and easy-to-handle hydrogen peroxide complex solution by mildly oxidizing hydrogen peroxide. Another object of the present invention is to provide a metal cleaning liquid composition that can safely and easily clean the surface of a metal using the above-described hydrogen peroxide composite liquid.

[0007]

Means of the present invention taken to solve the above problems are as follows. According to the first invention, there is provided a complex liquid for making hydrogen peroxide safe and easy to handle, comprising an aqueous solution of hydrogen peroxide, a weak acid,
A weak acid sodium dihydrogen dihydrate.

[0008] A second invention is the hydrogen peroxide complex solution according to the second invention, wherein the weak acid is selected from boric acid, phosphoric acid, and uric acid.

According to a third aspect of the present invention, there is provided a solution for cleaning the surface of a metal, wherein the complex solution of hydrogen peroxide according to the first or second aspect of the invention, a detergent, a chelating agent, and a surfactant. And a cleaning agent.

As the aqueous solution of hydrogen peroxide, inexpensive industrial chemicals having a concentration of 35 w / v% or more are used in large quantities. Oxitol has a milder oxidizing reaction than the above industrial chemicals, but is expensive and difficult to use. The most common type of metal to be cleaned is coins that people touch every day. However,
The metal to be washed is not limited to coins.

As the weak acid, boric acid, phosphoric acid, uric acid and the like are used. As the cleaning agent in the present specification, sulfamic acid having a relatively mild corrosive action on metals and having an etching action, and phosphoric acid and the like having an action as a buffering agent for sulfamic acid are used. As the chelating agent referred to in the present specification, citric acid, EDTA (ethylene / diamine /
Tetraacetic acid disodium salt), fucoidan and the like. They also act as masking agents.
As the surfactant, an anionic, nonionic or amphoteric surfactant capable of giving smoothness and shine to a metal surface such as a coin surface is used. Each of the above-mentioned drugs is a typical one, and is not limited thereto.

(Function) The complex solution of hydrogen peroxide is a mixture of an aqueous solution of hydrogen peroxide and a component containing a weak acid and a weak acid sodium dihydrogen dihydrate. The weak acid and the weak acid sodium dihydrogen dihydrate are mixed together and act as a regulator to suppress the decomposition of hydrogen peroxide. Therefore, hydrogen peroxide performs a mild oxidation reaction at room temperature,
In addition, heat is not generated due to the slow reaction, and fine bubbles are generated. Therefore, the complex liquid can be handled safely and its handling is simple.

In the complex solution of hydrogen peroxide, the weak acid selected from boric acid, phosphoric acid, and uric acid can sufficiently suppress the decomposition of hydrogen peroxide, and can perform a milder oxidation reaction at room temperature. The reaction does not generate heat due to the slow reaction, and only micro bubbles are generated. Therefore, the complex liquid is safer and easier to handle.

The metal cleaning liquid composition contains the above-mentioned complex of hydrogen peroxide, a cleaning agent, a chelating agent and a surfactant.
The complex solution of hydrogen peroxide gently decomposes to generate oxygen gas on the surface of a metal, for example, a coin, and has the effect of oxidizing and, at the same time, removing surface dirt by microbubbles of the oxygen gas. Oxidizing the surface also has the effect of killing attached bacteria and has an antibacterial effect. The cleaning agent has a cleaning effect by corroding the coin surface. The cleaning agent also has a buffering action and has an action of moderately corroding. The chelating agent has the effect of blocking metal ions and increasing the cleaning ability, while preventing the cleaning of metal ions of various coins. Surfactants have the effect of smoothing the surface of the coin and giving it shine. In this metal cleaning liquid composition, the actions of the above-mentioned components are all combined and synergistically act, so that it is possible to safely and easily wash metal surfaces of many kinds of coins and the like at the same time.

[0015]

Example 1 100 parts by weight of hydrogen peroxide having a concentration of 35 w / v%, 30 parts by weight of boric acid powder, 20 parts by weight of sodium dihydrogen phosphate dihydrate, and 1000 parts by weight of water are prepared. Hydrogen peroxide is gradually poured into the boric acid powder while stirring so as not to cause a sudden reaction. At the stage when the boric acid powder is sufficiently mixed in the hydrogen peroxide, the sodium dihydrogen phosphate dihydrate is slowly poured while stirring so that no rapid reaction occurs. After confirming that the mixture becomes completely transparent, water is poured into the mixture to dilute it to obtain a hydrogen peroxide complex solution. In addition, if the number of parts by weight of each drug is within the range of ± 5 parts by weight, the same effect as in the case of the number of parts by weight of each drug can be obtained. If the number of parts by weight is out of the range of ± 5 parts by weight, the effect may be reduced as compared with the above case.

(Function) This complex solution has a concentration of 35 w / v.
% Of hydrogen peroxide inherently has a strong oxidation reaction by boric acid and sodium dihydrogen phosphate dihydrate, so that a mild oxidation reaction is caused. Therefore, unlike a hydrogen peroxide having a concentration of 35 w / v%, the metal surface does not rapidly oxidize and deteriorate, does not rapidly generate a large amount of oxygen gas, and does not generate high heat.
It can be handled safely and easily.

[0017]

Example 2 Various drugs were prepared according to Table 1. The numbers in the table represent parts by weight. In addition, surfactant A used polyoxyethylene monostearate, surfactant B used polyoxyethylene alkyl ether, and surfactant C used sodium salt of 2-ethylhexylalkyl sulfate.

[0018]

[Table 1]

A detergent, a chelating agent, and a surfactant are sequentially added to the hydrogen peroxide complex solution while stirring to dissolve them uniformly to obtain a coin cleaning solution composition. In addition, if the number of parts by weight of each drug in Table 1 is within the range of ± 5 parts by weight, the same effect as in the case of the number of parts by weight of each drug can be obtained. If the number of parts by weight is out of the range of ± 5 parts by weight, the effect may be reduced as compared with the above case.

(Operation) The method and operation of cleaning coins using the cleaning liquid composition for coins obtained in Table 1 will be described. One liter of this coin cleaning liquid composition is prepared, and 1 yen, 5 yen, 10 yen, 50 yen, 100 yen
Insert 50 coins of 500 yen each, that is, a total of 300 coins. The coin is permeated and washed for 30 seconds by an ultrasonic device contained in the coin cleaning solution composition. The coin is taken out from the coin cleaning liquid composition, the cleaning liquid composition is sufficiently cut off, and rinsed with water for 30 seconds. After draining, it is dried for 1 minute by a warm air dryer.

All of the 300 coins washed with the above-described cleaning solution for coins are finished as if they were new. An inspection of the state of rust on the coin surface 30 days after washing was visually inspected. As a result, the clean state immediately after washing was maintained as it was, and the antibacterial action was maintained. This means that the surface of all coins that have been cleaned is oxidized by hydrogen peroxide,
This is because a strong metal oxide film was formed and turned into a chemically inert or stable surface.

The terms and expressions used in the present specification are illustrative only, and are not restrictive. Terms and expressions equivalent to the features described in this specification and some of them are not limited to the terms and expressions. There is no intention to exclude expression. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

[0023]

The present invention has the above configuration and has the following effects. (A) A complex solution of hydrogen peroxide is a mixture of an aqueous solution of hydrogen peroxide, a component containing a weak acid and a weak acid sodium dihydrogen dihydrate. The weak acid and the weak acid sodium dihydrogen dihydrate are mixed together and act as a regulator to suppress the decomposition of hydrogen peroxide. Therefore, hydrogen peroxide undergoes a mild oxidation reaction at room temperature, and does not generate heat due to the slow reaction, so that fine bubbles are generated. Therefore, the complex liquid can be handled safely and its handling is simple.

(B) In the complex solution of hydrogen peroxide, when the weak acid is selected from boric acid, phosphoric acid and uric acid, it can sufficiently suppress the decomposition of hydrogen peroxide, and is more gentle at room temperature. Oxidation reaction is performed, and no heat is generated due to the slow reaction, and only minute bubbles are generated. Therefore, the complex liquid is safer and easier to handle.

(C) The metal cleaning liquid composition contains a complex of hydrogen peroxide, a cleaning agent, a chelating agent, and a surfactant. The complex solution of hydrogen peroxide gently decomposes to generate oxygen gas on the surface of a metal, for example, a coin, and has the effect of oxidizing and, at the same time, removing surface dirt by microbubbles of the oxygen gas. Oxidizing the surface also has the effect of killing attached bacteria and has an antibacterial effect. The cleaning agent has a cleaning effect by corroding the coin surface. The cleaning agent also has a buffering action and has an action of moderately corroding. The chelating agent has the effect of blocking metal ions and increasing the cleaning ability, while preventing the cleaning of metal ions of various coins. Surfactants have the effect of smoothing the surface of the coin and giving it shine. In this metal cleaning liquid composition, the actions of the above-mentioned components are all combined and synergistically act, so that it is possible to safely and easily wash metal surfaces of many kinds of coins and the like at the same time.

Claims (3)

[Claims] 1. A complex liquid for making hydrogen peroxide safe and easy to handle, comprising: an aqueous solution of hydrogen peroxide; a weak acid; and sodium dihydrogen dihydrate of a weak acid. A complex liquid of hydrogen peroxide. 2. The hydrogen peroxide complex solution according to claim 1, wherein the weak acid is selected from boric acid, phosphoric acid, and uric acid. 3. A solution for cleaning the surface of a metal, comprising: the complex solution of hydrogen peroxide according to claim 1; a cleaning agent; a chelating agent; and a surfactant. A metal cleaning liquid composition.