JPH0223188B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a deodorizing agent that is highly effective in removing ammonia odor and other bad odors, for example in toilets, trash cans, refrigerators, and the like. [Prior art and its problems] For example, as a means of deodorizing or deodorizing a toilet, etc., there is a method of masking with fragrance, a method of adsorbing and removing malodorous substances with an adsorbent such as activated carbon, silica gel, or zeolite, and a method of removing malodorous substances with acid or A method of neutralizing malodorous substances with acids or alkalis, noting that many substances react with alkalis;
Methods have been proposed for removing malodorous substances by chemically reacting them with a substance whose main component is citric acid or maleic acid. However, among the above methods, the method of masking with perfume does not basically remove malodorous substances, and it only uses the scent of the perfume, so different odors may remain. It is not desirable because there are many people with allergies who cannot tolerate the scent of fragrances.
The adsorption removal method using activated carbon, etc. has disadvantages such as the adsorption power decreases in a short period of time due to the low adsorption amount of these adsorbed substances, and therefore the adsorbed substances have to be replaced frequently, which is cumbersome. Also, the method of neutralizing with acid or alkali is as follows:
There are a limited number of substances that can be removed, which limits its use as a deodorizing agent.Also, methods using citric acid and maleic acid are relatively effective against ammonia and amines among malodorous components; It has the disadvantage that it is not effective in removing mercaptans. Therefore, as an alternative to such means, L
- A deodorizing agent containing ascorbic acid and at least one iron compound selected from ferrous sulfate, ferrous chloride, and ferrous nitrate has been proposed (Japanese Patent Application Laid-Open No. 132937/1982). ing. While this deodorizer does have desirable properties, these are not sufficient and more is needed. [Disclosure of the Invention] In view of the above problems, while researching the deodorizing effects of various deodorizing agents, the present inventor used gallic acid as one component of the deodorizing agent, and found that other components For example, ferrous salts such as ferrous sulfate, ferrous nitrate or ferrous chloride, or ferric salts such as ferric chloride, and mixtures thereof with iron-based substances. It has been found that it exhibits an extremely excellent deodorizing effect. In addition, compared to hydrates such as FeSO ₄ H ₂ O
It was also found that the use of an anhydrous iron-based material such as FeSO ₄ has a greater deodorizing effect. That is, when an iron-based substance is used as a component of a deodorizing agent, it is desirable to remove as much H ₂ O as possible, for example, by drying or the like. Also, when comparing ferrous salts such as ferrous chloride and ferric salts such as ferric chloride, it is found that using ferrous salts such as ferrous chloride as the iron-based substance, these It has also been found that a deodorizing agent containing a mixture of iron-based substances and gallic acid has a better deodorizing effect. Further, as for the mixing ratio of the iron-based substance and gallic acid as described above, it is preferable that the ratio of gallic acid to 95-70% by weight of the iron-based substance be about 5-30% by weight, which exhibits an extremely desirable deodorizing effect. I also discovered that. Further, the deodorizing agent of the present invention can be produced by an extremely simple method of simply mixing gallic acid and an iron-based substance, and therefore can be provided at extremely low cost. The deodorizing agent of the present invention can be used in a solid form such as powder or granules, or in a liquid form dissolved in a solvent, or by impregnating ceramic, paper, cloth, etc. Can be used. And what is noteworthy is that, surprisingly,
Compared to deodorizers whose main ingredient is iron gallate, which is a reaction product between gallic acid and iron, a deodorizer made of a mixture of gallic acid and an iron-based substance rather than a reactant, as in the present invention, has a better deodorizing effect. It was excellent. [Example 1] For example, about 10 to 30 meshes of granular _FeSO4 .
90% by weight of _H2O and about 30 mesh powdered gallic acid
10% by weight and sufficiently mixed and dispersed to obtain the deodorizing agent of the present invention. Note that this deodorizer is only a mixture of FeSO ₄ .H ₂ O and gallic acid, and is not a reaction product. [Example 2] For example, about 50 to 70 meshes of powdered _FeSO4 .
90% by weight of _H2O and about 30 mesh powdered gallic acid
10% by weight and sufficiently mixed and dispersed to obtain the deodorizing agent of the present invention. [Example 3] For example, about 90 to 110 meshes of powdered FeSO ₄ 90
10% by weight and approximately 30% by weight of powdered gallic acid
The deodorizing agent of the present invention is obtained by sufficiently mixing and dispersing the ingredients. [Example 4] For example, about 90 to 110 meshes of FeSO ₄ 70
10% by weight and approximately 30% by weight of powdered gallic acid
The deodorizing agent of the present invention is obtained by thoroughly mixing and dispersing 20% by weight of powdered activated carbon of about 60 to 80 mesh. [Comparative Examples 1 to 4] Deodorizers were obtained in the same manner as in Examples 1 to 4 using L-ascorbic acid instead of gallic acid. [Comparative Example 5] In Example 1, FeSO ₄ H ₂ O was not used, and 30
Prepare a deodorizer made only of powdered gallic acid from honeysuckle. [Comparative Example 6] In Example 1, without using gallic acid,
Prepare one consisting only of FeSO ₄ H ₂ O. [Characteristics] A glass evaporating dish containing aqueous ammonia at a predetermined concentration was placed at the bottom of the desiccator, and the deodorizers of Examples 1 to 4 and Comparative Examples 1 to 6 were placed at the top with the passage plate as the border, and the desiccator was placed. The ammonia water concentration in each glass evaporating dish was titrated and determined using sulfuric acid for titration, and the ammonia absorption rate was calculated based on the following formula. The results are shown in Table 1. . Ammonia absorption rate (%) = 100-100 Residual ammonia concentration / Ammonia concentration before absorbing deodorizer

【table】

[Table] In addition, we used fresh kamaboko and milt instead of ammonia water in the above test, and investigated changes over time when Example 4 and Comparative Example 4 were used as deodorizers, and when no deodorant was used. ,
The results are shown in Table 2.

[Table] As can be seen from the ammonia absorption rate and malodor absorption tests using Milt and Kamaboko in Tables 1 and 2 above, the deodorizing effect of the deodorizer of the present invention is determined by L-ascorbic acid and ferrous sulfate. It shows better effectiveness than the deodorizers consisting of mixtures with gallic acid, gallic acid alone, ferrous sulfate, and reaction products of gallic acid and iron.

Claims (1)

[Claims] 1. A deodorizing agent comprising a mixture of gallic acid and at least one iron-based substance selected from the group of ferrous salts and ferric salts. 2. The deodorizer according to claim 1, wherein the mixing ratio of gallic acid and iron-based material is about 5 to 30 to 95 to 70 by weight. 3. The deodorizer according to claim 1 or 2, in which the iron-based substance is in the form of an anhydride.