Volatile sulfur compound reducing agent, reducing solution, and method for reducing volatile sulfur compounds

Abstract

The present invention provides a volatile sulfur compound reducer, a reducer liquid, and a method for reducing volatile sulfur compounds, with which it is possible to reduce volatile sulfur compounds. This volatile sulfur compound reducer is characterized by containing: at least one first compound selected from the group consisting of copper sulfate and copper gluconate; and at least one second compound selected from the group consisting of sulfates other than copper sulfate, gluconates other than copper gluconate, and citrates. The volatile sulfur compound reducer therefore has an exceptional effect for reducing volatile sulfur compounds.

Description

[Technical Field]

[0001] The present invention relates to a volatile sulfur compound reducing agent, a volatile sulfur compound reducing solution, and a volatile sulfur compound reducing method. [Background technology]

[0002] Volatile sulfur compounds (VSCs) such as hydrogen sulfide, methyl mercaptan, and dimethyl sulfide (dimethyl sulfide) are unpleasant compounds that are perceived as putrid odors and are known to be the cause of food waste odors and bad breath.

[0003] The odor of food waste is caused by the decomposition of food waste by bacteria and other organisms, resulting in the production of volatile sulfur compounds such as methyl mercaptan and hydrogen sulfide.

[0004] The main causes of bad breath are three types of volatile sulfur compounds (VSCs): hydrogen sulfide, methyl mercaptan, and dimethyl sulfide. Volatile sulfur compounds are thought to be generated when oral bacteria break down exfoliated epithelial cells and white blood cell debris in the oral cavity, as well as cysteine ​​and methionine contained in food.

[0005] The minimum concentration that humans can detect is called the olfactory threshold, and the olfactory thresholds of volatile sulfur compounds are extremely low: for example, hydrogen sulfide is 0.00041 ppm, and methyl mercaptan is 0.00007 ppm. On the other hand, the olfactory threshold of ammonia, which is known to have an unpleasant odor, is 1.5 ppm.

[0006] Thus, the olfactory threshold of volatile sulfur compounds is extremely low among unpleasant compounds, and even a small amount of volatile sulfur compounds is detected by the human olfactory sense and recognized as an unpleasant odor. In particular, methyl mercaptan has an extremely low olfactory threshold, so measures against methyl mercaptan are desired.

[0007] In particular, in recent years, as people have become more concerned about the airtightness of living spaces and etiquette, there has been a growing demand to reduce or eliminate unpleasant odors such as those generated by food waste and bad breath in daily life.

[0008] Patent Document 1 proposes an agent for suppressing the generation of malodor, which contains, as an active ingredient, one or more compounds selected from the group consisting of thymol, citral, decanol, eugenol, and isoeugenol. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-033680 Summary of the Invention [Problem to be solved by the invention]

[0010] However, the above-mentioned malodor generation inhibitors are insufficient in their effect of reducing putrid odors caused by volatile sulfur compounds, and a more effective treatment method for reducing volatile sulfur compounds is desired.

[0011] The present invention provides a volatile sulfur compound reducing agent capable of reducing volatile sulfur compounds (VSCs), a reduced-sulfur compound solution using the same, and a method for reducing volatile sulfur compounds. [Means for solving the problem]

[0012] The volatile sulfur compound reducing agent of the present invention comprises: at least one first compound selected from the group consisting of copper sulfate and copper gluconate; and at least one second compound selected from the group consisting of sulfates other than copper sulfate, gluconates other than copper gluconate, and citrates.

[0013] The volatile sulfur compound reducing agent of the present invention comprises: at least one first compound selected from the group consisting of copper sulfate and copper gluconate; The composition contains at least one second compound selected from the group consisting of iron sulfate, zinc sulfate, aluminum sulfate, aluminum potassium sulfate, aluminum ammonium sulfate, zinc gluconate, and citrate. [Effects of the Invention]

[0014] The agent for reducing volatile sulfur compounds of the present invention is highly effective in reducing volatile sulfur compounds. DETAILED DESCRIPTION OF THE INVENTION

[0015] The volatile sulfur compound reducing agent of the present invention comprises: at least one first compound selected from the group consisting of copper sulfate and copper gluconate; and at least one second compound selected from the group consisting of sulfates other than copper sulfate, gluconates other than copper gluconate, and citrates.

[0016] In the first compound and the second compound, the terms sulfate, gluconate, citrate and the sub-terms thereof each include anhydrous and hydrated salts unless otherwise specified.

[0017] The volatile sulfur compound reducing agent of the present invention comprises: at least one first compound selected from the group consisting of copper sulfate and copper gluconate; The composition contains at least one second compound selected from the group consisting of iron sulfate, zinc sulfate, aluminum sulfate, aluminum potassium sulfate, aluminum ammonium sulfate, zinc gluconate, and citrate.

[0018] The agent for reducing volatile sulfur compounds contains the first compound and the second compound, and thus exhibits an excellent effect in reducing volatile sulfur compounds.

[0019] The volatile sulfur compound reducer can remove volatile sulfur compounds to a low concentration. It is preferable that the volatile sulfur compounds can be reduced to 20% by mass or less (preferably 15% by mass or less, more preferably 10% by mass or less, more preferably 5% by mass or less) of the initial amount of volatile sulfur compounds. It is preferable that the volatile sulfur compounds can be reduced to 20% by volume or less (preferably 15% by volume or less, more preferably 10% by volume or less, more preferably 5% by volume or less) of the initial amount of volatile sulfur compounds. The measurement results of the degree of volatile sulfur compound reduction described below can be used as a guide. It is preferable that the initial amount of hydrogen sulfide can be reduced to 20% by mass or less (preferably 15% by mass or less, more preferably 10% by mass or less, more preferably 5% by mass or less). It is preferable that the initial amount of hydrogen sulfide can be reduced to 20% by volume or less (preferably 15% by volume or less, more preferably 10% by volume or less, more preferably 5% by volume or less). It is preferable that the initial amount of methyl mercaptan can be reduced to 20% by mass or less (preferably 15% by mass or less, more preferably 10% by volume or less, more preferably 5% by mass or less). It is preferable that the amount of methyl mercaptan can be reduced to 20% by volume or less (preferably 15% by volume or less, more preferably 10% by volume or less, more preferably 5% by volume or less) of the initial amount of methyl mercaptan.

[0020] Volatile sulfur compounds (VSCs) are sulfur compounds that are volatile, become gaseous in the atmosphere, and contain sulfur atoms. Examples of volatile sulfur compounds include hydrogen sulfide, methyl mercaptan, and dimethyl sulfide (dimethyl sulfide).

[0021] (1st compound) The volatile sulfur compound reducing agent contains a first compound. The first compound contains at least one copper compound selected from the group consisting of copper sulfate (including anhydrides and hydrates) and copper gluconate (including [HOCH2(HCOH)4COO]2Cu and its hydrates). The first compound contains copper sulfate and / or copper gluconate. As the copper sulfate, either copper(I) sulfate (including Cu2SO4 and its hydrates) or copper(II) sulfate (including CuSO4 and its hydrates) can be used, with copper(II) sulfate being preferred. The first compound may be used alone or in combination of two or more. The first compound may be a hydrate or anhydrous. In the present invention, the content (mass) of each of the first compounds in the volatile sulfur compound reducing agent refers to the mass calculated on an anhydrous basis. In the present invention, the term "anhydrous basis" refers to conversion to the amount of solid matter under ideal dry conditions in which the compound contains no moisture (crystal water).

[0022] (Second compound) The agent for reducing volatile sulfur compounds contains a second compound. The second compound includes at least one compound selected from the group consisting of sulfates (including anhydrous and hydrated forms) other than copper sulfate (including anhydrous and hydrated forms), gluconates (including anhydrous and hydrated forms) other than copper gluconate (including anhydrous and hydrated forms), and citrates (including anhydrous and hydrated forms). The second compound may be used alone or in combination of two or more. The second compound may be a hydrate or anhydrous. In the present invention, the content (mass) of each compound of the second compound in the agent for reducing volatile sulfur compounds refers to the mass calculated as the anhydrous form.

[0023] The second compound preferably contains at least one compound selected from the group consisting of iron sulfate (including anhydrous and hydrated), zinc sulfate (including anhydrous and hydrated), aluminum sulfate (including anhydrous and hydrated), potassium aluminum sulfate (including anhydrous and hydrated), ammonium aluminum sulfate (including anhydrous and hydrated), zinc gluconate (including anhydrous and hydrated), and citrate (including anhydrous and hydrated).

[0024] The sulfate constituting the second compound is not particularly limited as long as it is other than copper sulfate, and examples thereof include iron sulfate, zinc sulfate, aluminum sulfate, aluminum potassium sulfate, aluminum ammonium sulfate, and calcium sulfate. Iron sulfate, zinc sulfate, aluminum sulfate, aluminum potassium sulfate, and aluminum ammonium sulfate are preferred. Ferrous sulfate (iron (II) sulfate, FeSO4) is preferred. Sulfates include anhydrous and hydrated forms.

[0025] The gluconate constituting the second compound is not particularly limited as long as it is other than copper gluconate, and examples thereof include zinc gluconate, calcium gluconate, and aluminum gluconate, with zinc gluconate and calcium gluconate being preferred, and zinc gluconate being more preferred. Gluconate salts include anhydrates and hydrates.

[0026] The citrate is not particularly limited and includes, for example, sodium ferrous citrate, ammonium ferrous citrate, sodium iron citrate, ammonium iron citrate, potassium citrate, sodium citrate, ammonium citrate, etc., with sodium ferrous citrate, ammonium ferrous citrate, sodium iron citrate, and ammonium iron citrate being preferred, and sodium ferrous citrate being more preferred. Note that citrates include anhydrous and hydrated forms.

[0027] In the volatile sulfur compound reducer, the content of the second compound is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, and even more preferably 5 parts by mass or more, per 100 parts by mass of the first compound. When the content of the second compound is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved. When multiple types of second compounds are included, the content of the second compounds refers to the total mass of the multiple compounds that make up the second compound. When multiple types of first compounds are included, the content of the first compounds refers to the total mass of the multiple compounds that make up the first compound.

[0028] In the volatile sulfur compound reducer, the content of the second compound is preferably 3000 parts by mass or less, more preferably 1500 parts by mass or less, more preferably 1400 parts by mass or less, more preferably 1350 parts by mass or less, more preferably 1300 parts by mass or less, more preferably 1250 parts by mass or less, more preferably 1200 parts by mass or less, more preferably 1150 parts by mass or less, more preferably 1100 parts by mass or less, more preferably 1000 parts by mass or less, more preferably 750 parts by mass or less, more preferably 500 parts by mass or less, more preferably 450 parts by mass or less, more preferably 400 parts by mass or less, more preferably 350 parts by mass or less, and more preferably 300 parts by mass or less, relative to 100 parts by mass of the first compound. More preferably, the content of the second compound is 250 parts by mass or less, more preferably 200 parts by mass or less, more preferably 180 parts by mass or less, more preferably 160 parts by mass or less, more preferably 140 parts by mass or less, more preferably 125 parts by mass or less, more preferably 120 parts by mass or less, more preferably 110 parts by mass or less, more preferably 100 parts by mass or less, more preferably 95 parts by mass or less, more preferably 90 parts by mass or less, more preferably 85 parts by mass or less, more preferably 75 parts by mass or less, more preferably 65 parts by mass or less, more preferably 55 parts by mass or less, more preferably 45 parts by mass or less, more preferably 35 parts by mass or less, more preferably 25 parts by mass or less, more preferably 15 parts by mass or less. When the content of the second compound is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0029] When the second compound contains iron sulfate, the content of iron sulfate in the volatile sulfur compound reducer is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, more preferably 5 parts by mass or more, more preferably 8 parts by mass or more, more preferably 15 parts by mass or more, more preferably 30 parts by mass or more, more preferably 35 parts by mass or more, more preferably 40 parts by mass or more, more preferably 50 parts by mass or more, more preferably 60 parts by mass or more, more preferably 70 parts by mass or more, more preferably 80 parts by mass or more, and more preferably 85 parts by mass or more, per 100 parts by mass of the first compound. When the content of iron sulfate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0030] When the second compound contains iron sulfate, the content of iron sulfate in the volatile sulfur compound reducer is preferably 1,500 parts by mass or less, more preferably 1,000 parts by mass or less, more preferably 900 parts by mass or less, more preferably 800 parts by mass or less, more preferably 700 parts by mass or less, more preferably 600 parts by mass or less, more preferably 500 parts by mass or less, more preferably 450 parts by mass or less, more preferably 400 parts by mass or less, more preferably 350 parts by mass or less, more preferably 300 parts by mass or less, more preferably 250 parts by mass or less, more preferably 200 parts by mass or less, more preferably 150 parts by mass or less, more preferably 130 parts by mass or less, more preferably 125 parts by mass or less, more preferably 120 parts by mass or less, more preferably 110 parts by mass or less, more preferably 100 parts by mass or less, more preferably 95 parts by mass or less, and more preferably 90 parts by mass or less. When the content of iron sulfate is within the above range, the VSC reducing effect of the volatile sulfur compound reducing agent is improved.

[0031] When the second compound contains zinc sulfate, the content of zinc sulfate in the volatile sulfur compound reducer is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, more preferably 5 parts by mass or more, more preferably 8 parts by mass or more, more preferably 15 parts by mass or more, more preferably 30 parts by mass or more, more preferably 35 parts by mass or more, more preferably 40 parts by mass or more, and more preferably 45 parts by mass or more, relative to 100 parts by mass of the first compound. When the content of zinc sulfate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0032] When the second compound contains zinc sulfate, the content of zinc sulfate in the volatile sulfur compound reducer is preferably 1500 parts by mass or less, more preferably 1000 parts by mass or less, more preferably 900 parts by mass or less, more preferably 800 parts by mass or less, more preferably 700 parts by mass or less, more preferably 600 parts by mass or less, more preferably 500 parts by mass or less, more preferably 450 parts by mass or less, more preferably 400 parts by mass or less, more preferably 350 parts by mass or less, more preferably 300 parts by mass or less, more preferably 250 parts by mass or less, relative to 100 parts by mass of the first compound. More preferably, 200 parts by mass or less, more preferably 180 parts by mass or less, more preferably 150 parts by mass or less, more preferably 130 parts by mass or less, more preferably 125 parts by mass or less, more preferably 120 parts by mass or less, more preferably 110 parts by mass or less, more preferably 100 parts by mass or less, more preferably 95 parts by mass or less, more preferably 90 parts by mass or less, more preferably 80 parts by mass or less, more preferably 70 parts by mass or less, more preferably 60 parts by mass or less, more preferably 55 parts by mass or less, more preferably 48 parts by mass or less. When the content of zinc sulfate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0033] When the second compound contains aluminum sulfate, the content of aluminum sulfate in the volatile sulfur compound reducer is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, more preferably 1.5 parts by mass or more, more preferably 5 parts by mass or more, more preferably 10 parts by mass or more, more preferably 15 parts by mass or more, more preferably 30 parts by mass or more, more preferably 35 parts by mass or more, more preferably 40 parts by mass or more, and more preferably 45 parts by mass or more, relative to 100 parts by mass of the first compound. When the content of aluminum sulfate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0034] When the second compound contains aluminum sulfate, the content of aluminum sulfate in the volatile sulfur compound reducer is preferably 1500 parts by mass or less, more preferably 1000 parts by mass or less, more preferably 900 parts by mass or less, more preferably 800 parts by mass or less, more preferably 700 parts by mass or less, more preferably 600 parts by mass or less, more preferably 500 parts by mass or less, more preferably 450 parts by mass or less, more preferably 400 parts by mass or less, and more preferably 350 parts by mass or less, relative to 100 parts by mass of the first compound. Preferably, 300 parts by mass or less is more preferable, 250 parts by mass or less is more preferable, 200 parts by mass or less is more preferable, 150 parts by mass or less is more preferable, 130 parts by mass or less is more preferable, 125 parts by mass or less is more preferable, 120 parts by mass or less is more preferable, 110 parts by mass or less is more preferable, 100 parts by mass or less is more preferable, 95 parts by mass or less is more preferable, 90 parts by mass or less is more preferable, 80 parts by mass or less is more preferable, 70 parts by mass or less is more preferable, and 60 parts by mass or less is more preferable. When the content of aluminum sulfate is within the above range, the VSC reducing effect of the volatile sulfur compound reducer is improved.

[0035] When the second compound contains aluminum potassium sulfate, the content of aluminum potassium sulfate in the volatile sulfur compound reducer is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, more preferably 5 parts by mass or more, more preferably 10 parts by mass or more, more preferably 15 parts by mass or more, more preferably 30 parts by mass or more, more preferably 35 parts by mass or more, more preferably 40 parts by mass or more, and more preferably 45 parts by mass or more, relative to 100 parts by mass of the first compound. When the content of aluminum potassium sulfate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0036] When the second compound includes aluminum potassium sulfate, the content of aluminum potassium sulfate in the volatile sulfur compound reducer is preferably 1500 parts by mass or less, more preferably 1000 parts by mass or less, more preferably 900 parts by mass or less, more preferably 800 parts by mass or less, more preferably 700 parts by mass or less, more preferably 600 parts by mass or less, more preferably 500 parts by mass or less, more preferably 450 parts by mass or less, more preferably 400 parts by mass or less, and more preferably 350 parts by mass or less, relative to 100 parts by mass of the first compound. More preferably, the content is 330 parts by mass or less, more preferably 300 parts by mass or less, more preferably 250 parts by mass or less, more preferably 200 parts by mass or less, more preferably 150 parts by mass or less, more preferably 130 parts by mass or less, more preferably 125 parts by mass or less, more preferably 120 parts by mass or less, more preferably 110 parts by mass or less, more preferably 100 parts by mass or less, more preferably 95 parts by mass or less, more preferably 90 parts by mass or less, more preferably 80 parts by mass or less, more preferably 70 parts by mass or less, and more preferably 60 parts by mass or less. When the content of aluminum potassium sulfate is within the above range, the VSC reducing effect of the volatile sulfur compound reducer is improved.

[0037] When the second compound contains ammonium aluminum sulfate, the content of ammonium aluminum sulfate in the volatile sulfur compound reducer is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, more preferably 0.8 parts by mass or more, more preferably 1 part by mass or more, more preferably 5 parts by mass or more, and more preferably 9 parts by mass or more, relative to 100 parts by mass of the first compound. When the content of ammonium aluminum sulfate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0038] When the second compound includes ammonium aluminum sulfate, the content of ammonium aluminum sulfate in the volatile sulfur compound reducing agent is more preferably 1500 parts by mass or less, more preferably 1000 parts by mass or less, more preferably 900 parts by mass or less, more preferably 800 parts by mass or less, more preferably 700 parts by mass or less, more preferably 600 parts by mass or less, more preferably 500 parts by mass or less, more preferably 450 parts by mass or less, more preferably 400 parts by mass or less, more preferably 350 parts by mass or less, more preferably 300 parts by mass or less, relative to 100 parts by mass of the first compound. Parts by mass or less is more preferable, 250 parts by mass or less is more preferable, 200 parts by mass or less is more preferable, 150 parts by mass or less is more preferable, 130 parts by mass or less is more preferable, 125 parts by mass or less is more preferable, 120 parts by mass or less is more preferable, 110 parts by mass or less is more preferable, 100 parts by mass or less is more preferable, 95 parts by mass or less is more preferable, 90 parts by mass or less is more preferable, 45 parts by mass or less is more preferable, 35 parts by mass or less is more preferable, 25 parts by mass or less is more preferable, 15 parts by mass or less is more preferable, and 8 parts by mass or less is more preferable. When the content of aluminum ammonium sulfate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0039] When the second compound contains a citrate, the content of the citrate in the volatile sulfur compound reducer is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, more preferably 3 parts by mass or more, more preferably 5 parts by mass or more, more preferably 7 parts by mass or more, more preferably 12 parts by mass or more, more preferably 20 parts by mass or more, more preferably 25 parts by mass or more, more preferably 30 parts by mass or more, more preferably 35 parts by mass or more, more preferably 40 parts by mass or more, and more preferably 45 parts by mass or more, relative to 100 parts by mass of the first compound. When the citrate content is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0040] When the second compound contains a citrate, the content of the citrate in the volatile sulfur compound reducer is preferably 1500 parts by mass or less, more preferably 1000 parts by mass or less, more preferably 900 parts by mass or less, more preferably 800 parts by mass or less, more preferably 700 parts by mass or less, more preferably 600 parts by mass or less, more preferably 500 parts by mass or less, more preferably 450 parts by mass or less, more preferably 400 parts by mass or less, more preferably 350 parts by mass or less, more preferably 300 parts by mass or less, more preferably 250 parts by mass or less, more preferably 200 parts by mass or less, more preferably 180 parts by mass or less, more preferably 170 parts by mass or less, more preferably 160 parts by mass or less, more preferably 150 parts by mass or less, relative to 100 parts by mass of the first compound. When the citrate content is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0041] When the second compound contains sodium ferrous citrate, the content of sodium ferrous citrate in the volatile sulfur compound reducer is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, more preferably 3 parts by mass or more, more preferably 5 parts by mass or more, more preferably 7 parts by mass or more, more preferably 12 parts by mass or more, more preferably 20 parts by mass or more, more preferably 25 parts by mass or more, more preferably 30 parts by mass or more, more preferably 35 parts by mass or more, more preferably 40 parts by mass or more, and more preferably 45 parts by mass or more, per 100 parts by mass of the first compound. When the content of sodium ferrous citrate is within the above range, the VSC reducing effect of the volatile sulfur compound reducer is improved.

[0042] When the second compound contains sodium ferrous citrate, the content of sodium ferrous citrate in the volatile sulfur compound reducer is preferably 1500 parts by mass or less, more preferably 1000 parts by mass or less, more preferably 900 parts by mass or less, more preferably 800 parts by mass or less, more preferably 700 parts by mass or less, more preferably 600 parts by mass or less, more preferably 500 parts by mass or less, more preferably 450 parts by mass or less, more preferably 400 parts by mass or less, more preferably 350 parts by mass or less, more preferably 300 parts by mass or less, more preferably 250 parts by mass or less, more preferably 200 parts by mass or less, more preferably 180 parts by mass or less, more preferably 170 parts by mass or less, more preferably 160 parts by mass or less, and more preferably 150 parts by mass or less, per 100 parts by mass of the first compound. When the content of sodium ferrous citrate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0043] When the second compound contains zinc gluconate, the content of zinc gluconate in the volatile sulfur compound reducer is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, more preferably 5 parts by mass or more, more preferably 10 parts by mass or more, more preferably 15 parts by mass or more, more preferably 30 parts by mass or more, more preferably 35 parts by mass or more, more preferably 40 parts by mass or more, and more preferably 45 parts by mass or more, relative to 100 parts by mass of the first compound. When the content of zinc gluconate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0044] When the second compound contains zinc gluconate, the content of zinc gluconate in the volatile sulfur compound reducer is more preferably 1500 parts by mass or less, more preferably 1000 parts by mass or less, more preferably 900 parts by mass or less, more preferably 800 parts by mass or less, more preferably 700 parts by mass or less, more preferably 600 parts by mass or less, more preferably 500 parts by mass or less, more preferably 450 parts by mass or less, more preferably 400 parts by mass or less, and more preferably 350 parts by mass or less, relative to 100 parts by mass of the first compound. Preferably, the amount is 300 parts by mass or less, more preferably 250 parts by mass or less, more preferably 200 parts by mass or less, more preferably 150 parts by mass or less, more preferably 130 parts by mass or less, more preferably 125 parts by mass or less, more preferably 120 parts by mass or less, more preferably 110 parts by mass or less, more preferably 100 parts by mass or less, more preferably 95 parts by mass or less, more preferably 90 parts by mass or less, more preferably 80 parts by mass or less, more preferably 70 parts by mass or less, and more preferably 60 parts by mass or less. When the content of zinc gluconate is within the above range, the VSC reducing effect of the volatile sulfur compound reducer is improved.

[0045] The second compound preferably contains iron sulfate, and more preferably contains iron sulfate and zinc sulfate, because this improves the VSC reduction effect of the volatile sulfur compound reducer. When the second compound contains iron sulfate and zinc sulfate, the content ratio of iron sulfate to zinc sulfate (mass of iron sulfate / mass of zinc sulfate) is preferably 0.003 or more, more preferably 0.005 or more, more preferably 0.006 or more, more preferably 0.008 or more, more preferably 0.01 or more, more preferably 0.05 or more, more preferably 0.06 or more, more preferably 0.07 or more, more preferably 0.08 or more, more preferably 0.09 or more, more preferably 0.1 or more, more preferably 0.3 or more, and more preferably 0.5 or more. The content ratio of iron sulfate to zinc sulfate (mass of iron sulfate / mass of zinc sulfate) is preferably 300 or less, more preferably 250 or less, more preferably 200 or less, more preferably 150 or less, more preferably 100 or less, more preferably 90 or less, more preferably 80 or less, more preferably 75 or less, more preferably 70 or less, more preferably 65 or less, more preferably 60 or less, more preferably 55 or less, more preferably 50 or less, more preferably 45 or less, more preferably 40 or less, more preferably 35 or less, more preferably 30 or less, more preferably 25 or less, more preferably 20 or less, more preferably 18 or less, more preferably 16 or less, more preferably 14 or less, more preferably 12 or less, more preferably 10 or less, more preferably 8 or less, more preferably 6 or less, more preferably 4 or less, more preferably 3 or less. When the content ratio of iron sulfate to zinc sulfate (mass of iron sulfate / mass of zinc sulfate) is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0046] When the second compound contains iron sulfate and zinc sulfate, the total content of iron sulfate and zinc sulfate in the volatile sulfur compound reducer is preferably 1 part by mass or more, more preferably 5 parts by mass or more, more preferably 10 parts by mass or more, more preferably 20 parts by mass or more, more preferably 30 parts by mass or more, more preferably 40 parts by mass or more, more preferably 50 parts by mass or more, more preferably 60 parts by mass or more, more preferably 70 parts by mass or more, more preferably 80 parts by mass or more, more preferably 90 parts by mass or more, more preferably 100 parts by mass or more, more preferably 110 parts by mass or more, more preferably 115 parts by mass or more, more preferably 120 parts by mass or more, more preferably 125 parts by mass or more, relative to 100 parts by mass of the first compound. When the total content of iron sulfate and zinc sulfate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0047] When the second compound contains iron sulfate and zinc sulfate, the total content of iron sulfate and zinc sulfate in the volatile sulfur compound reducer is preferably 3000 parts by mass or less, more preferably 2000 parts by mass or less, more preferably 1000 parts by mass or less, more preferably 900 parts by mass or less, more preferably 800 parts by mass or less, more preferably 700 parts by mass or less, more preferably 600 parts by mass or less, more preferably 500 parts by mass or less, more preferably 400 parts by mass or less, more preferably 350 parts by mass or less, more preferably 300 parts by mass or less, more preferably 250 parts by mass or less, more preferably 200 parts by mass or less, per 100 parts by mass of the first compound. When the total content of iron sulfate and zinc sulfate is within the above range, the VSC reduction effect of the volatile sulfur compound reducer is improved.

[0048] The agent for reducing volatile sulfur compounds may contain known additives (for example, antioxidants, ultraviolet absorbers, antistatic agents, etc.) within the range that does not impair its physical properties.

[0049] (Volatile sulfur compound reducer) The volatile sulfur compound reducing agent can be produced by mixing the first compound and the second compound by a known method. When the volatile sulfur compound reducing agent contains a known additive, the first compound, the second compound, and the additive may be mixed by a known method.

[0050] In producing the volatile sulfur compound reducing agent, the first compound, the second compound, and additives contained as necessary may be dissolved or dispersed in a solvent to produce a reduced solution of the volatile sulfur compound reducing agent.

[0051] Examples of the solvent include water and aqueous solvents such as alcohols (methyl alcohol, ethyl alcohol, butyl alcohol, propyl alcohol, etc.), and preferably contain water. The solvent preferably contains 70% by mass or more of water, preferably 80% by mass or more, preferably 90% by mass or more, and preferably 100% by mass. The solvent may contain an organic solvent such as toluene, xylene, ethyl acetate, benzene, acetone, or hexane, but preferably does not contain one.

[0052] The content of the solvent in the reduced solution is preferably 10 parts by mass or more, more preferably 100 parts by mass or more, more preferably 1000 parts by mass or more, more preferably 2000 parts by mass or more, and more preferably 5000 parts by mass or more, per 100 parts by mass of the volatile sulfur compound reducing agent. The content of the solvent in the reduced solution is preferably 100,000 parts by mass or less, more preferably 50,000 parts by mass or less, more preferably 40,000 parts by mass or less, and more preferably 30,000 parts by mass or less, per 100 parts by mass of the volatile sulfur compound reducing agent.

[0053] The volatile sulfur compound reducing agent may be used as a reducing liquid by dissolving or dispersing it in a solvent, or may be used without dissolving and / or dispersing it in a solvent. The volatile sulfur compound reducing agent is preferably used as a reducing liquid, since it can be uniformly applied (e.g., attached, coated, etc.) to the object to be treated.

[0054] The pH of the reduced solution is preferably 3 to 7, more preferably 3.5 to 4.5. When the pH of the reduced solution containing a volatile sulfur compound reducing agent is within the above range, the VSC reducing effect of the volatile sulfur compound reducing agent is improved. In the volatile sulfur compound reducing agent, the effect of reducing methyl mercaptan and dimethyl sulfide (dimethyl sulfide) is further improved, and the effect of reducing methyl mercaptan is particularly improved.

[0055] The usage of the volatile sulfur compound reducing agent will be described. The volatile sulfur compound reducing agent can reduce or remove volatile sulfur compounds by contacting them with the volatile sulfur compounds. For example, the volatile sulfur compound reducing agent is supplied to a target object that contains or may contain volatile sulfur compounds. Examples of methods for supplying the volatile sulfur compound reducing agent to the target object include (1) applying or spraying the reducing liquid onto the target object and then removing the solvent; (2) immersing the target object in the reducing liquid and then removing the solvent; (3) adhering the volatile sulfur compound reducing agent to the target object; and (4) kneading the volatile sulfur compound reducing agent into the target object. Examples of methods for kneading the volatile sulfur compound reducing agent into the target object include mixing the volatile sulfur compound reducing agent with the raw material (e.g., synthetic resin) of the target object in advance and then manufacturing the target object (e.g., extrusion molding, injection molding, etc.).

[0056] When a volatile sulfur compound reducing agent is kneaded into the body to be treated, the amount of the volatile sulfur compound reducing agent kneaded into the body to be treated is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, more preferably 0.2 parts by mass or more, and more preferably 0.3 parts by mass or more, per 100 parts by mass of the body to be treated. When a volatile sulfur compound reducing agent is kneaded into the body to be treated, the amount of the volatile sulfur compound reducing agent kneaded into the body to be treated is preferably 80% by mass or less, more preferably 70% by mass or less, more preferably 60% by mass or less, more preferably 50% by mass or less, more preferably 40% by mass or less, and more preferably 30% by mass or less, per 100 parts by mass of the body to be treated.

[0057] The volatile sulfur compound reducer captures volatile sulfur compounds that come into contact with the reducer, and can stably reduce the amount of volatile sulfur compounds emitted into the atmosphere over a long period of time. Therefore, the volatile sulfur compound reducer can stably suppress or eliminate odors caused by volatile sulfur compounds.

[0058] The objects to be treated include not only objects containing volatile sulfur compounds but also objects that do not contain volatile sulfur compounds but may contain volatile sulfur compounds due to the external supply of volatile sulfur compounds. That is, the objects to be treated include not only objects that already contain volatile sulfur compounds and emit volatile sulfur compounds, but also objects that do not contain volatile sulfur compounds when the volatile sulfur compound reducing agent is supplied, but that emit volatile sulfur compounds when volatile sulfur compounds are supplied after the volatile sulfur compound reducing agent is supplied. The objects to be treated for which the volatile sulfur compound reducing agent is used include objects that contain or may contain volatile sulfur compounds. Examples of objects to be treated include interior and exterior finishing materials (e.g., wallpaper, flooring materials, roofing materials, various boards, building materials, etc.), building materials such as performance maintaining materials (sealing materials, heat insulating materials, sound absorbing materials, waterproofing materials, etc.), interior materials for transportation equipment (e.g., automobiles, trains, airplanes, ships, etc.) (e.g., ceiling materials, surface finishing materials for seats, flooring materials, etc.), daily necessities, textile products (e.g., fabric products such as woven fabrics, nonwoven fabrics, knitted fabrics, articles containing fabric products, etc.), and synthetic resin molded products.

[0059] The volatile sulfur compound reducing agent may be contained in a food such as gum, or may be taken in a tablet. By containing the volatile sulfur compound reducing agent in a food such as gum or a tablet, the volatile sulfur compound reducing agent can be taken into the body, and the volatile sulfur compounds can be captured by the volatile sulfur compound reducing agent before they are released from the mouth, thereby reducing or preventing the release of volatile sulfur compounds from the mouth.

[0060] Alternatively, the volatile sulfur compounds can be reduced by spraying the reduced solution into the atmosphere and bringing the volatile sulfur compounds in the atmosphere into contact with the volatile sulfur compound reducing agent, thereby capturing the volatile sulfur compounds with the volatile sulfur compound reducing agent. The solvent used for the reduced solution is preferably alcohol.

[0061] For a liquid containing a volatile sulfur compound reducing agent, the degree of volatile sulfur compound reduction is preferably 80% or more, more preferably 85% or more, and even more preferably 90% or more. For a liquid containing a volatile sulfur compound reducing agent, the degree of hydrogen sulfide reduction is preferably 90% or more. For a liquid containing a volatile sulfur compound reducing agent, the degree of methyl mercaptan reduction is preferably 80% or more. Note that for a liquid containing a volatile sulfur compound reducing agent, the degree of volatile sulfur compound reduction refers to a value measured as described in the examples.

[0062] For a volatile sulfur compound reducer (a state in which the volatile sulfur compound reducer is not dissolved or dispersed in a solvent), the degree of volatile sulfur compound reduction (after 2 hours) is preferably 80% or more. For a volatile sulfur compound reducer (a state in which the volatile sulfur compound reducer is not dissolved or dispersed in a solvent), the degree of hydrogen sulfide reduction (after 2 hours) is preferably 80% or more. For a volatile sulfur compound reducer (excluding when used as a reduced sulfur compound solution), the degree of methyl mercaptan reduction (after 2 hours) is preferably 80% or more.

[0063] For a volatile sulfur compound reducer (in a state where the volatile sulfur compound reducer is not dissolved or dispersed in a solvent), the degree of volatile sulfur compound reduction (after 24 hours) is preferably 80% or more, more preferably 85% or more, more preferably 90% or more, and more preferably 95% or more. For a volatile sulfur compound reducer (in a state where the volatile sulfur compound reducer is not dissolved or dispersed in a solvent), the degree of hydrogen sulfide reduction (after 24 hours) is preferably 80% or more, more preferably 85% or more, more preferably 90% or more, and more preferably 95% or more. For a volatile sulfur compound reducer (in a state where the volatile sulfur compound reducer is not dissolved or dispersed in a solvent), the degree of methyl mercaptan reduction (after 24 hours) is preferably 80% or more, more preferably 85% or more, more preferably 90% or more, and more preferably 95% or more.

[0064] Regarding the agent for reducing volatile sulfur compounds, the degree of reduction of volatile sulfur compounds refers to a value measured in the manner shown in the examples. [Example]

[0065] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples.

[0066] (Example 1 36 , Comparative Example 1 See Examples 1-36 ) A predetermined amount of the first compound (copper sulfate hydrate [copper (II) sulfate hydrate], copper gluconate hydrate) and a second compound (iron sulfate hydrate [iron (II) sulfate hydrate], zinc sulfate hydrate, aluminum sulfate hydrate, aluminum potassium sulfate hydrate, aluminum ammonium sulfate hydrate, zinc gluconate hydrate, sodium ferrous citrate hydrate) shown in Tables 1 to 6 were mixed to prepare a volatile sulfur compound reducer containing the first compound and the second compound. Tables 1 to 6 show the mass of each compound constituting the first compound and the second compound, calculated on an anhydrous basis.

[0067] The obtained volatile sulfur compound reducing agent was added to a predetermined amount of water shown in Tables 1 to 6 and mixed to prepare a reduced sulfur compound solution. The amount of the compound shown in Tables 1 to 6 is expressed in parts by mass. The content of the volatile sulfur compound reducing agent in the reduced sulfur compound solution (anhydrous equivalent) was adjusted to 0.5% by mass.

[0068] The degree of reduction of volatile sulfur compounds in the obtained reduced solution was measured as described in "Degree of reduction of volatile sulfur compounds (A)", and the results are shown in the "Evaluation" column of Tables 1 to 6. The pH of the obtained reduced solution was measured, and the results are shown in Tables 1 to 6.

[0069] Example Examples 37-72 (see reference examples 37-72) ) A volatile sulfur compound reducer containing the first compound and the second compound was prepared by mixing predetermined amounts of the first compound (anhydrous copper sulfate [anhydrous copper(II) sulfate], anhydrous copper gluconate) and the second compound (anhydrous iron sulfate [anhydrous iron(II) sulfate], anhydrous zinc sulfate, anhydrous aluminum sulfate, anhydrous potassium aluminum sulfate, anhydrous ammonium aluminum sulfate, anhydrous zinc gluconate, anhydrous sodium ferrous citrate) shown in Tables 7 to 12.

[0070] The degree of volatile sulfur compound reduction of the obtained volatile sulfur compound reducer was measured as described in "Degree of volatile sulfur compound reduction (B)", and the results are shown in the "Evaluation" column of Tables 7 to 12.

[0071] [Degree of reduction of volatile sulfur compounds (A)] A cotton cloth measuring 5 cm on a flat surface and 3 mm thick was prepared. Five milliliters of the reducing solution was soaked into the cotton cloth to prepare a test piece.

[0072] A 3-liter sampling bag (made of vinyl alcohol resin) was prepared. Test pieces and hydrogen sulfide or methyl mercaptan as volatile sulfur compounds (VSCs) were placed in the sampling bag, after which the air in the sampling bag was completely replaced with clean air. The volatile sulfur compounds (hydrogen sulfide or methyl mercaptan) were placed in the sampling bag, and the initial concentrations of hydrogen sulfide and methyl mercaptan were adjusted to 20 ppm by volume and 15 ppm by volume, respectively.

[0073] The sampling bag was sealed, and after 30 minutes at an ambient temperature of 25°C, 100 milliliters of air was collected from the sampling bag, and the amount of volatile sulfur compounds in the air (ppm by volume) was measured. The reduction rate (%) of volatile sulfur compounds was calculated using the following formula. The reduction rates of volatile sulfur compounds are shown in the "hydrogen sulfide" and "methyl mercaptan" columns in the table. Note that due to the measurement limits of the equipment used to measure the amount of volatile sulfur compounds in the air (ppm by volume), the upper limit of the reduction rate of volatile sulfur compounds was 99.75% for hydrogen sulfide and 99.33% for methyl mercaptan. Volatile sulfur compound reduction rate (%) = 100 × (initial concentration of volatile sulfur compounds - concentration of volatile sulfur compounds remaining in the sampling bag) / initial concentration of volatile sulfur compounds

[0074] [Degree of reduction of volatile sulfur compounds (B)] 70 parts by mass of high-density polyethylene and 30 parts by mass of a volatile sulfur compound reducing agent were fed into an extruder and melt-kneaded. The extruder extruded the mixture into strands. The resulting strand-like extrudate was cut into pieces with a volume of approximately 0.15 cm. 3 (0.1~0.2cm 3 ) test pieces (pellets) were prepared.

[0075] Except for using the above test specimens, the reduction degree (%) of volatile sulfur compounds was measured 2 hours and 24 hours after the start of the test in the same manner as described in the reduction degree (A) of volatile sulfur compounds.

[0076] Table 1

[0077] Table 2

[0078] Table 3

[0079] Table 4

[0080] Table 5

[0081] Table 6

[0082] Table 7

[0083] Table 8

[0084] Table 9

[0085] Table 10

[0086] Table 11

[0087] [Table 12] [Industrial Applicability]

[0088] The volatile sulfur compound reducer of the present invention can effectively reduce volatile sulfur compounds, and therefore, by contacting the volatile sulfur compound reducer with volatile sulfur compounds, the volatile sulfur compounds can be captured and odors caused by the volatile sulfur compounds can be suppressed.

[0089] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to Japanese Patent Application No. 2020-161546, filed on September 26, 2020, the disclosure of which is incorporated herein by reference in its entirety.

Claims

1. 100 parts by mass of at least one first compound selected from the group consisting of copper sulfate and copper gluconate; A volatile sulfur compound reducer comprising, as a second compound, 5 to 180 parts by mass of at least one citrate salt selected from the group consisting of sodium ferrous citrate, ammonium ferrous citrate, sodium iron citrate, ammonium iron citrate, potassium citrate, sodium citrate, and ammonium citrate, 0.1 to 130 parts by mass of zinc sulfate, 5 to 60 parts by mass of aluminum sulfate, 5 to 350 parts by mass of potassium aluminum sulfate, 0.5 to 110 parts by mass of ammonium aluminum sulfate, or 30 to 200 parts by mass of zinc gluconate.

2. 100 parts by mass of at least one first compound selected from the group consisting of copper sulfate and copper gluconate; The second compound includes iron sulfate and zinc sulfate, the total content of the iron sulfate and the zinc sulfate is 70 to 200 parts by mass, A volatile sulfur compound reducing agent characterized in that the content ratio of the iron sulfate to the zinc sulfate (mass of the iron sulfate / mass of the zinc sulfate) is 0.5 to 20.

3. a solvent; A volatile sulfur compound reducing solution comprising the volatile sulfur compound reducing agent according to claim 1 or 2 dissolved or dispersed in the solvent.

4. A method for reducing volatile sulfur compounds, characterized by contacting a volatile sulfur compound reducer described in claim 1 or claim 2 with the volatile sulfur compound to reduce the volatile sulfur compound.

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