JP2015205847A - Non-corrosive acetic peracid preparation and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-corrosive acetic peracid preparation which is environmentally friendly, has high sterilization property and disinfection property, and suppresses occurrence of corrosion to metals, especially to iron, and a production method thereof.SOLUTION: After a peroxide stock solution to which a trace quantity of polyacrylic acid is added, is mixed with a stock solution of an acetic peracid preparation having a specific composition, the mixture is diluted by water for obtaining the acetic peracid preparation including peroxide, acetic peracid, acetic acid, and polyacrylic acid. The obtained acetic peracid preparation has high sterilization force and disinfection force, and suppresses corrosion action to an iron material and the like.

Description

The present invention is mainly used in the field of sterilization and sterilization, and is widely used for the purpose of sterilization and sterilization of objects such as facilities, buildings, equipment, equipment, instruments, tools, containers, etc. The present invention relates to a non-corrosive peracetic acid preparation capable of suppressing the occurrence of corrosion on iron and a method for producing the same.

Peracetic acid formulations have strong bactericidal properties and have been used in various sterilization applications as environmentally friendly peroxides. In particular, sterilization treatment is required in recent years because peracetic acid preparations have high bactericidal activity and immediate effect even at low concentrations, have a wide antibacterial spectrum, and have excellent bactericidal / sterilizing effects on bacterial spores, fungi, yeast, etc. Widely used in the food and beverage industry.

In general, a peracetic acid stock solution having a peracetic acid concentration of 1 to 10% by weight, a hydrogen peroxide concentration of 3 to 20% by weight, and an acetic acid concentration of 10 to 40% by weight A working solution that can be diluted with a diluent such as water so as to have a concentration of 100 ppm to 5000 ppm is sterilized by spraying, spraying, or immersing the object on the object.

A method for producing a peracetic acid preparation is known as a method of reacting acetic acid with hydrogen peroxide. This reaction proceeds as an equilibrium reaction of peracetic acid, hydrogen peroxide and acetic acid, and a higher concentration of peracetic acid is generated as the concentration of hydrogen peroxide and acetic acid is increased. The ratio of peracetic acid, hydrogen peroxide, and acetic acid changes with time due to dilution, etc., but the ratio of peracetic acid preparation, which is an equilibrium reaction composition, will remain at the original composition ratio even if diluted for a short time after dilution. Can keep. Therefore, if the peracetic acid preparation stock solution is diluted and then quickly sprayed and sprayed on the sterilization / sterilization target, the original excellent sterilization power can be maintained without deterioration.

These environmentally friendly peracetic acid preparations with a strong bactericidal action are useful in other fields such as hospitals, schools and other public facilities, livestock-related farms such as pig farms and poultry farms, and agricultural and horticultural facilities such as plastic houses. I can expect. However, use in such fields has not been fully developed yet, mainly because of the following issues.

Peracetic acid is an equilibrium reaction product obtained by an equilibrium reaction represented by [hydrogen peroxide] / [acetic acid] ⇔ [peracetic acid] / [water] by mixing hydrogen peroxide and acetic acid. Contains hydrogen peroxide and acetic acid. When the concentration of hydrogen peroxide in the stock solution is increased to 6% by weight or more in order to increase the concentration of peracetic acid, which is the main bactericidal component, hydrogen peroxide becomes a deleterious substance, and handling such as transportation and storage is restricted. .

In the above, if the concentration of acetic acid instead of hydrogen peroxide in the stock solution is increased, the content of acetic acid with respect to hydrogen peroxide is high even if the use solution diluted with water so that the concentration of peracetic acid becomes 100 ppm to 5000 ppm is used. It causes corrosion to metals, especially to iron materials that are generally widely used.

Although the concentration of the peracetic acid stock solution can be lowered, it is not possible to further increase the dilution factor in the usage situation, so the volume of the stock solution handled at a time increases, and handling, transportation, and storage by increasing the size of the container are possible. It is not a practical solution because it is not good.

The solution to the above problem is as a means to suppress the occurrence of rust (corrosion) due to the concentration of acetic acid, for example, as a means to suppress corrosion against aluminum, peracetic acid and mono-tricarboxylic acid, further chelating agents, stabilizers, antiseptics A composition containing an additive selected from an agent, a pH adjuster, and a buffer has been proposed (Patent Document 1).

In addition, peracetic acid and alkali metal phosphates, stabilizers (phosphonic acid, cyclohexane-1,2-diaminotetramethylenephosphonic acid) can be used as a method to suppress corrosion on aluminum, copper, brass, stainless steel, etc. as medical devices. Etc.) (Patent Document 2), a composition combining peracetic acid with 1,2,3-benzotriazole and alkylene glycol (Patent Document 3), peracetic acid, triazole, azole, benzoate, five-membered ring Although a composition selected from a compound and a composition selected from molybdate, chromate, borate, vanadate, tungstate (Patent Document 4), etc. are disclosed, Since the composition of the peracetic acid preparation is complicated, the manufacturing process can be complicated, and environmental considerations and production costs are not preferable.

A simple method (Patent Document 5) for adjusting a peracetic acid preparation to pH 4.6 to less than 6.2 with a pH adjuster such as sodium hydroxide has been proposed. However, as a medical instrument originally required for corrosion resistance It only mentions its application to aluminum, copper, brass, stainless steel, etc.

Therefore, conventional peracetic acid preparations have strong corrosive properties against iron materials that are most commonly widely used in public facilities, livestock farms, agricultural and horticultural facilities. Even though it is inexpensive, its application in a wide range of fields as a disinfectant and disinfectant has not yet been fully developed.

International Publication No. 2010/095231 Japanese National Patent Publication No. 8-500843 JP 2001-506971 A JP-A-2-83301 JP 2010-95448 A

The present invention provides a non-corrosive peracetic acid preparation that is environmentally friendly, has high sterilization and sterilization power, and can suppress the occurrence of corrosion on metals, particularly iron, and a method for producing the same.

The present inventors mixed a hydrogen peroxide stock solution containing a small amount of polyacrylic acid with a stock solution of a peracetic acid preparation of a specific composition and then diluted with water to obtain hydrogen peroxide, peracetic acid, acetic acid and A peracetic acid preparation containing polyacrylic acid has been found to be capable of suppressing the corrosive action on iron materials and the like, and a convenient manufacturing method, and has completed the present invention.

That is, the present invention has the following configuration.

[1] A peracetic acid preparation containing hydrogen peroxide, acetic acid, peracetic acid and polyacrylic acid, wherein the concentration of the hydrogen peroxide relative to the total amount of the peracetic acid preparation is 300 ppm to 5000 ppm. Corrosive peracetic acid formulation.
[2] A non-corrosive peracetic acid formulation, wherein the concentration of the acetic acid is 3 to 4 times the hydrogen peroxide concentration with respect to the total amount of the peracetic acid formulation.
[3] A non-corrosive peracetic acid formulation, wherein the concentration of the acetic acid is 4 to 8 times the concentration of peracetic acid with respect to the total amount of the peracetic acid formulation.
[4] The non-corrosive peracetic acid formulation, wherein the concentration of the polyacrylic acid is 1 ppm to 10 ppm with respect to the total amount of the peracetic acid formulation.
[5] A method for producing a non-corrosive peracetic acid formulation comprising a step of adding a hydrogen peroxide stock solution (B stock solution) to a peracetic acid formulation stock solution (A stock solution), uniformly mixing, and further diluting with water. In the equilibrium state, the A stock solution contains less than 6 wt% of hydrogen peroxide with respect to the total amount of the A stock solution, and the acetic acid concentration is 4 to 8 times the peracetic acid concentration. The manufacturing method of the non-corrosive peracetic acid formulation characterized by containing less than 6 wt% hydrogen peroxide and 0.01 wt%-0.05 wt% polyacrylic acid with respect to the whole stock solution.

The non-corrosive peracetic acid preparation according to the present invention suppresses the occurrence of rust (corrosion) against metals, particularly iron, and can be used as a spraying disinfectant in various places and facilities where iron materials are exposed. Can be used. Further, the peracetic acid preparation containing a peracetic acid concentration of 100 ppm to 5000 ppm has a very good bactericidal ability and can kill a wide range of disease-causing bacteria including spore bacteria.

The present invention will be described in detail below.
The present invention substantially suppresses the occurrence of corrosion on iron, which is widely used in metals, especially facilities, equipment, equipment, etc., at a practical solution concentration of a peracetic acid preparation having a strong bactericidal power. The present invention relates to a non-corrosive peracetic acid preparation that can be used for a wide range of sterilization and sterilization applications, such as spraying and immersion treatment, and a method for producing the same.

In general, the practical peracetic acid concentration used for sterilization treatment of facilities and equipment is 100 ppm to 5000 ppm. Conventionally, in a peracetic acid preparation having a peracetic acid concentration obtained by diluting a peracetic acid stock solution with water or the like, the concentration of hydrogen peroxide contained is 150 to 9000 ppm, and the concentration of acetic acid is 200 ppm to 11000 ppm. These peracetic acid preparations have strong corrosiveness to metals, particularly iron.

The non-corrosive peracetic acid preparation of the present invention is a working solution obtained by diluting a stock solution with water (for example, distilled water, pure water, deionized water, etc.), and the concentration of hydrogen peroxide with respect to the total amount. Is 300 ppm to 5000 ppm, and in addition to hydrogen peroxide, acetic acid and peracetic acid, which are the original compositions of peracetic acid preparations, only a small amount of polyacrylic acid is added, and sufficient rust is generated on metals, especially iron In addition, the conventional bactericidal power, environmental friendly characteristics and economic efficiency of the peracetic acid preparation are maintained.

The concentration of hydrogen peroxide contained in the non-corrosive peracetic acid preparation is 300 ppm to 5000 ppm, more preferably 300 ppm to 3000 ppm, and particularly preferably 500 ppm to 2000 ppm.

The concentration of acetic acid contained in the non-corrosive peracetic acid preparation is 3 to 4 times the hydrogen peroxide concentration. That is, the concentration of acetic acid contained in the non-corrosive peracetic acid preparation is 900 ppm to 20000 ppm, more preferably 1500 ppm to 10000 ppm, and particularly preferably 1500 ppm to 5000 ppm.

The concentration of acetic acid contained is 4 to 8 times the concentration of peracetic acid with respect to the total amount of the non-corrosive peracetic acid preparation. That is, the concentration of peracetic acid contained in the non-corrosive peracetic acid preparation is 100 ppm to 5000 ppm, more preferably 200 ppm to 3000 ppm, and particularly preferably 200 ppm to 1000 ppm.

The concentration of the polyacrylic acid contained is 1 ppm to 10 ppm, more preferably 1 ppm to 6 ppm with respect to the total amount of the non-corrosive peracetic acid preparation. Even if less than 1 ppm of polyacrylic acid is added, the effect of suppressing the corrosive action on metals such as iron is insufficient, and when adding more than 10 ppm of polyacrylic acid, polyacrylic acid often used as a thickener is There is a possibility that the viscosity of the peracetic acid preparation use liquid may be increased, which may cause troubles when sprayed or sprayed.

The non-corrosive peracetic acid preparation of the present invention having the composition and composition concentration range described above has a simple composition, and the conventional peracetic acid preparation has inherently strong bactericidal power and environmentally friendly characteristics. However, it is possible to suppress the occurrence of sufficient corrosion on metals, particularly iron.

The non-corrosive peracetic acid preparation of the present invention contains a trace amount of polyacrylic acid, and the mechanism of why corrosion does not occur in metals such as iron is unknown, but only hydrogen peroxide and phosphoric acid The combination of acid such as nitric acid and oxalic acid is used for chemical polishing of metals such as iron, nickel and aluminum, and the viscosity of the liquid is an important factor due to the interaction with the metal surface. It is known that there is not enough theoretical explanation. Polyacrylic acid is known as a polymer-absorbing material, but it is also used as a thickener. On the other hand, this viscosity induces the interaction between iron and other metal surfaces and hydrogen peroxide. It seems that the occurrence of corrosion by acetic acid is suppressed.

There are several points to be noted regarding the preparation of the stock solution that is the basis of the non-corrosive peracetic acid preparation (use solution) of the present invention. First, hydrogen peroxide is a deleterious substance when its concentration is 6% by weight or more, and it is a dangerous substance when its concentration is 44% by weight or more. It is advantageous to produce a stock solution of 6% by weight or less by using a raw material having a hydrogen peroxide concentration of 44% by weight or less as much as possible in the industry.

However, when the hydrogen peroxide is less than 6% by weight, it is necessary to increase the concentration of acetic acid present at the same time in order to increase the concentration of peracetic acid to 3% by weight or more, preferably 5% by weight or more. In such a peracetic acid formulation stock solution, the concentration of acetic acid is 20% to 40% by weight. Even if such a peracetic acid stock solution is simply diluted with water or the like to make the working solution so that the peracetic acid concentration falls within the concentration range of 100 ppm to 5000 ppm, the concentration of hydrogen peroxide and the concentration of acetic acid in the working solution The ratio remains unchanged, and it is impossible to improve the situation that causes rust (corrosion) to iron materials and the like by acetic acid.

Preparation of a stock solution as a raw material for a non-corrosive peracetic acid preparation (use solution) according to the present invention was devised as follows.

Preparation of peracetic acid formulation stock solution (A stock solution) Commercially available hydrogen peroxide, acetic acid and distilled water, etc. are mixed in an appropriate ratio, and the target hydrogen peroxide concentration (less than 6% by weight) and acetic acid / peracetic acid concentration ratio ( (4 times to 8 times) until it reaches an equilibrium state.

Specifically, commercially available 35 wt% to 40 wt% hydrogen peroxide, 68 wt% to 90 wt% acetic acid, homogeneously mixed with distilled water or pure water, deionized water, etc., and allowed to stand for 4 days. Thereafter, a peracetic acid formulation A stock solution is prepared so that the concentration of hydrogen peroxide contained is less than 6% by weight and the concentration of acetic acid contained is 4 to 8 times the concentration of peracetic acid. More preferably, the peracetic acid formulation A stock solution is prepared so that the concentration of acetic acid contained is 6 to 8 times the concentration of peracetic acid.

Preparation of hydrogen peroxide stock solution (B stock solution) After adding polyacrylic acid to commercially available hydrogen peroxide of 35 wt% to 40 wt%, dilute with distilled water, pure water or deionized water, etc. to make the total amount of B stock solution In contrast, a hydrogen peroxide stock solution (B stock solution) containing polyacrylic acid having a hydrogen peroxide concentration of less than 6 wt% and 0.01 wt% to 0.05 wt% is obtained.

Polyacrylic acid may be added to 1 ppm to 10 ppm with respect to the total amount of the peracetic acid preparation use liquid after preparing the use liquid of the peracetic acid preparation. However, in consideration of actual use situations, it is more convenient to add to the A stock solution or the B stock solution in advance so that the above concentration is obtained in the working solution. More preferably, it is better to add to the B stock solution in advance.

Adjustment of the content of acetic acid in the peracetic acid preparation (use liquid) The above-mentioned peracetic acid preparation stock solution (A stock solution) and hydrogen peroxide stock solution (B stock solution) are mixed at an appropriate ratio, and the desired concentration ratio of hydrogen peroxide and acetic acid. After that, it may be diluted quickly with water as necessary. As described above, when the A stock solution is diluted only with water, the ratio of the hydrogen peroxide concentration to the acetic acid concentration in the original A stock solution is maintained as it is, which causes corrosion to the metal. . However, when the B stock solution is mixed with the A stock solution, the B stock solution is a solution in which hydrogen peroxide is diluted to less than 6 wt%, and the hydrogen peroxide concentration in the A stock solution is almost the same. The concentration of hydrogen does not change and the concentration of acetic acid can be reduced. Since the ratio between the hydrogen peroxide concentration and the acetic acid concentration in the working solution is reduced, the acetic acid concentration that causes the rust (corrosion) of iron materials, etc., is affected, and the corrosion of metals is reduced. This is considered to be one of the causes that can be suppressed. By this method, since the concentration ratio of hydrogen peroxide to acetic acid in the peracetic acid preparation can be freely adjusted, it becomes easy to prepare a composition solution having a preferable concentration ratio of hydrogen peroxide to acetic acid. By diluting with water to a concentration, it is possible to prepare a peracetic acid preparation (use liquid) having sufficient sterilizing power and suppressing corrosion against metals.

Since the peracetic acid formulation stock solution (A stock solution) and the hydrogen peroxide stock solution (B stock solution) basically contain water, even if water is used for dilution, there is no change in the component ratio of each composition.

Although it is the ratio which mixes A undiluted solution and B undiluted solution, it is not limited in particular, and if it considers from the operation convenience in an actual use scene, the mixing ratio of A undiluted solution and B undiluted solution is preferred.

However, because the peracetic acid preparation is an equilibrium reaction represented by [hydrogen peroxide] / [acetic acid] ⇔ [peracetic acid] / [water], it depends on the temperature. In a new equilibrium state, the concentration of peracetic acid changes in a decreasing direction, and there is a possibility that the bactericidal power and the rust generation inhibition ability are impaired.

If the elapsed time after dilution is short, the concentration ratio by mixing can be kept almost as it is, and the sterilizing power and the suppression of rust generation can be maintained. Therefore, it is effective to mix A stock solution and B stock solution and dilute with distilled water or the like immediately before use in an actual use scene. For example, when used as a bactericide / disinfectant, immediately after mixing A stock solution and B stock solution at a predetermined ratio (for example, 1: 1), adding water at a predetermined ratio and diluting it immediately It is preferable to spray or spray on an object to be sterilized and sterilized because a better sterilizing and sterilizing effect and an effect of suppressing generation of rust such as iron can be obtained.

The non-corrosive peracetic acid preparation of the present invention is a peracetic acid preparation containing peracetic acid, hydrogen peroxide, acetic acid and a small amount of polyacrylic acid, and may further contain other components that enhance the corrosion prevention effect. However, from the viewpoint of consideration for the environment, ease of preparation work, and cost, it is more preferable that the types and amounts of other additives are smaller.

Moreover, since the final decomposition product of the composition comprising hydrogen peroxide, acetic acid, peracetic acid and water becomes water, oxygen and acetic acid and is nontoxic, a composition which does not impair its environmentally friendly characteristics is particularly preferable. The polyacrylic acid used in the present invention is a polymer of acrylic acid, is non-toxic and easily soluble in water, and is also used as a food additive. Therefore, peracetic acid preparations do not impair the inherent environmental friendly characteristics.

(Measurement and calculation of each composition concentration)
The concentration of peracetic acid was determined by the following method. The conversion method from the “mol%” concentration described below to the “wt%” concentration is omitted.
(1) Measurement of total peracid concentration About 0.1 ml of pure water was added to 0.1 g of a solution containing peracetic acid, 10 ml of 10% sulfuric acid, 10 ml of 1N potassium iodide solution, and 1 to 2 drops of 0.5% ammonium molybdate solution. And titrated with a N / 10 sodium thiosulfate standard solution to obtain the concentration (mol%) of the total peracid. As a measuring instrument, 665 Dosimat (manufactured by Metrohm)) was used.
(2) Measurement of hydrogen peroxide concentration To 0.1 g of a solution containing the same peracetic acid, add about 20 ml of pure water, add 10 ml of 10% sulfuric acid and 2-3 drops of ferroin indicator, and titrate with N / 10 cerium sulfate standard solution. The hydrogen peroxide concentration (mol%) was obtained. As a measuring instrument, 665 Dosimat (manufactured by Metrohm)) was used.
(3) Calculation of peracetic acid concentration The peracetic acid concentration was calculated by converting the value obtained by subtracting (2) hydrogen peroxide concentration from (1) total peroxide concentration to peracetic acid concentration according to the following equation.
Peracetic acid concentration (mol%) = (total peroxide concentration (mol%))-hydrogen peroxide concentration (mol%))
(4) Measurement of total acid concentration The total acid concentration in the peracetic acid preparation was measured by neutralization titration (1 / 10N NaOH titration method) using sodium hydroxide.
(5) Calculation of acetic acid concentration Acetic acid concentration (mol%) = (total acid concentration (mol%)-peracetic acid concentration (mol%)
(6) Concentration of polyacrylic acid It is a concentration by weight based on the total amount simply calculated from the added amount.

(Preparation of stock solution)
23.5 g of 35 wt% hydrogen peroxide (manufactured by Hodogaya Chemical Co., Ltd.), 54 g of 80 wt% acetic acid (manufactured by Hiyakusei) and 22.5 g of distilled water (DMW) were mixed and allowed to stand at 40 ° C. for 4 days. As a result, a peracetic acid preparation (A stock solution) containing 5.5 wt% peracetic acid, 5.8 wt% hydrogen peroxide, and 37.9 wt% acetic acid was obtained. In addition, 35 wt% hydrogen peroxide was diluted with water to obtain a 5.9 wt% hydrogen peroxide stock solution. A polyacrylic acid solution (25 wt%, Wako Pure Chemical Industries, Ltd.) was added to and mixed with the obtained hydrogen peroxide stock solution to 0.03 wt% to obtain a B stock solution. Using these undiluted solutions, a peracetic acid preparation use solution was prepared in the next experiment for examining the corrosiveness to iron.

(Examination of the effect of suppressing rust generation on iron pieces)
A stock solution, B stock solution and distilled water were mixed at the dilution ratios shown in Table 1 to prepare use solutions at various mixing ratios. Comparative Examples 1 and 3 were obtained by mixing and diluting a hydrogen peroxide stock solution and A stock solution to which polyacrylic acid was not added. Table 1 shows the hydrogen peroxide concentration, acetic acid concentration, peracetic acid concentration and polyacrylic acid concentration with respect to the total amount in the peracetic acid preparation use solution.

Regarding the corrosiveness of the prepared use liquid to iron, three polished iron pieces (5 cm × 3 cm × 0.3 cm) were immersed in 100 ml of each of these use liquids for 10 minutes. Thereafter, the iron piece was taken out and exposed to air with a liquid attached to the surface. Leave at room temperature for 3 hours (until the adhering liquid dries), visually observe the degree of rust generation, the symbol “◎” indicates no complete corrosion on the iron piece surface, and “○” indicates 90% or more of the iron piece. There was no corrosion on the surface area of the steel piece, “Δ” was evaluated as corrosive on the surface area of 10% to less than 30% of the iron piece, and “×” was evaluated as corrosive on the surface area of 30% or more of the iron piece. The results are shown in Table 1. .

As can be seen from the results of Comparative Example 1 and Comparative Example 3, the conventional peracetic acid preparation consisting of hydrogen peroxide, acetic acid and peracetic acid simply corroded with water to reduce the concentration of acetic acid, but corrosive action on iron pieces Remains unchanged and still has strong corrosivity. On the other hand, from the results of Examples 1 to 4, if the composition of hydrogen peroxide, acetic acid and peracetic acid having the same composition ratio contains polyacrylic acid having a concentration of 1 ppm or more, the composition has a corrosive action on iron. It turns out that it becomes what can suppress.
Therefore, the non-corrosive peracetic acid preparation of the present invention has an excellent sterilizing and sterilizing effect, and can suppress the occurrence of corrosion on metals, particularly iron.

Non-corrosive peracetic acid preparations according to the present invention are food-related, sterile packaging containers, equipment / containers, indoor environment sterilization, medical-related, high-level disinfection / endoscope / dialysis line / other medical devices / hospital environment sterilization It is a peracetic acid formulation that is effective in sterilizing harmful bacteria including spore bacteria in fields and applications such as linen-related, agricultural / fishery-related equipment, and pathogen sterilization.

◎ ・ ・ ・ ・ ・ ・ No corrosion on the iron piece surface ○ ・ ・ ・ ・ ・ ・ No corrosion on the area of 90% or more of the iron piece,
Δ ··· Corrosion on an area of 10% to less than 30% of the iron piece,
× ······ Corrosion on more than 30% of the iron piece

Claims (5)

A peracetic acid preparation comprising hydrogen peroxide, acetic acid, peracetic acid and polyacrylic acid, wherein the concentration of the hydrogen peroxide is 300 ppm to 5000 ppm with respect to the total amount of the peracetic acid preparation. Peracetic acid preparation. The non-corrosive peracetic acid preparation according to claim 1, wherein the concentration of the acetic acid is 3 to 4 times the hydrogen peroxide concentration with respect to the total amount of the peracetic acid preparation. The non-corrosive peracetic acid preparation according to claim 1 or 2, wherein the concentration of the acetic acid is 4 to 8 times the concentration of the peracetic acid with respect to the total amount of the peracetic acid preparation. The non-corrosive peracetic acid formulation according to claim 1, wherein the concentration of the polyacrylic acid is 1 ppm to 10 ppm with respect to the total amount of the peracetic acid formulation. A method for producing a non-corrosive peracetic acid formulation comprising a step of adding a hydrogen peroxide stock solution (B stock solution) to a peracetic acid formulation stock solution (A stock solution), uniformly mixing, and further diluting with water. The A stock solution contains less than 6 wt% hydrogen peroxide with respect to the total amount of the A stock solution in an equilibrium state, and the acetic acid concentration is 4 to 8 times the concentration of peracetic acid. The method for producing a non-corrosive peracetic acid preparation according to claim 1, comprising less than 6 wt% hydrogen peroxide and 0.01 wt% to 0.05 wt% polyacrylic acid. .