JPH05309266A - Deodorant - Google Patents

Abstract

PURPOSE:To obtain a deodorant at a low cost and with high safety, having an excellent deodorizing effect for lower fatty acids by using apatite hydroxide whose Ca/P mol ratio is less than a specific value and whose surface is chemically active. CONSTITUTION:The apatite hydroxide represented by Ca10(PO4)6(OH)2, especially the apatite hydroxide whose Ca/P mol ratio is <=1.67 and whose surface is chemically active, is used as the objective deodorant. Lower fatty acids being a malodorous component are adsorbed on the surface of this apatite hydroxide. At this time, carboxyl group of the lower fatty acids reacts with a Ca<2+> site and a PO4<3-> site on the apatite hydroxide surface and is adsorbed strongly. Thus, the lower fatty acids being a malodorous component are strongly deodorized efficiently and without releasing again.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a deodorant having a good deodorizing effect on lower fatty acids which are malodorous substances.

[0002]

2. Description of the Related Art In recent years, there is an increasing need for various commercial and domestic deodorants for the purpose of improving and improving the living environment.

The deodorizing method is roughly classified into a sensory deodorizing method using an aromatic agent and a masking agent, a chemical deodorizing method utilizing a chemical reaction such as a neutralization reaction, a physical adsorption deodorizing method utilizing physical adsorption, and a microbial decomposition. A biological deodorizing method utilizing the action is known.

Among these, the sensory deodorizing method using a masking agent is a method different from the direct removal of the malodorous component,
It is not a fundamental solution because it has a bad taste for the odor of masking agents. In addition, the biological deodorizing method requires a large amount of equipment and is not versatile.

Therefore, it can be said that the general deodorizing method, especially for household use, is superior to the chemical deodorizing method and the physical adsorption deodorizing method.

Lower fatty acids such as propionic acid, butyric acid, caproic acid and isovaleric acid are malodorous components such as body odor.

As materials for deodorizing these lower fatty acids by a physical adsorption deodorizing method or a chemical deodorizing method, "Advance and practice of deodorizing technology", published by General Technology Center, 2
23-259 319-332 425-426 44
As described in 2-447 (1991), solid bases such as zinc oxide and activated carbon are known, but the former are basic oxides and therefore have skin irritation and vapor toxicity. In the latter case, the lower fatty acid once adsorbed may be released depending on the use conditions, and since it is black, there is a problem in that it has an aversion to use and the places of use are limited.

[0008]

The present invention has an excellent deodorizing effect on lower fatty acids, does not re-emit odorous substances, and can be used in a wide range of places. It is inexpensive and highly safe. The purpose is to provide a deodorant.

[0009]

DISCLOSURE OF THE INVENTION The present invention is a deodorant containing hydroxyapatite.

Hydroxyapatite is Ca ₁₀ (PO ₄ )
_A group of compounds belonging to the hexagonal system P6 ₃ / m, which is represented by ₆ (OH) ₂ and has a basic composition with a Ca / P molar ratio of 1.67.

Even if the chemical composition varies from the basic composition (Ca / P molar ratio <1.67), if the crystal structure shows an apatite structure, it is classified as hydroxyapatite. Apatite includes those having a change in their chemical composition.

[0012]

The lower fatty acid, which is a malodorous component, is adsorbed on the surface of hydroxyapatite.

At this time, the carboxyl group (-
COOH) and Ca on the surface of hydroxyapatite²⁺ Site and PO
_Four ^3-It is considered that the site acts and is strongly adsorbed.

In the case of hydroxyapatite having a Ca / P molar ratio of less than 1.67, in addition to the above Ca ²⁺ sites and PO ₄ ³ -sites, in order to compensate for the electrical imbalance caused by the structural change. H ⁺ sites arise.

It is considered that the lower fatty acid is more strongly adsorbed by the action of this H ⁺ site.

For the above reasons, the preferred shape of the hydroxyapatite used in the present invention is low crystalline, fine crystalline and high specific surface area, and the chemical composition is such that the Ca / P molar ratio is excellent in chemical activity. Is preferably less than 1.67, more preferably a Ca / P molar ratio of less than 1.55.

The hydroxyapatite used in the present invention can be synthesized by a generally known synthesis method such as a dry solid phase reaction method, a wet precipitation reaction method, a wet hydrolysis method, a hydrothermal hydrolysis method and the like. ..

Among them, the wet precipitation reaction method and the wet hydrolysis method have low crystallinity, fine crystals, high specific surface area and excellent chemical activity as a chemical composition, and have a Ca / P molar ratio of less than 1.67. Since it is easy to obtain the hydroxyapatite of
It is suitable for the synthesis of hydroxyapatite used in the present invention.

Hydroxyapatite has a composition and structure similar to apatite, which is an inorganic component of living bones, and therefore is easily adapted to the living body, and has been widely noticed as a material such as artificial bones and artificial roots in the form of powder, granules or bulk. Being researched.

As described above, hydroxyapatite is highly safe, stable for a long period of time, and is white and odorless.

Hydroxyapatite is also very stable thermally and its structure is maintained even if it is fired at 900 ° C.

Therefore, it is possible to regenerate used hydroxyapatite by heat treatment such as firing and steaming.

INDUSTRIAL APPLICABILITY The present invention is used as a deodorant for removing body odor such as deodorant, as a domestic deodorant for kitchen garbage, toilets, refrigerators, automobiles, etc. Can be used.

Hydroxyapatite may be used alone,
It may be used in combination with other deodorants.

[0025]

The present invention will be described in detail with reference to examples.

(1) Preparation Example of Hydroxyapatite by Hydrolysis Method After adding 80 g of calcium hydrogen phosphate dihydrate to 400 ml of distilled water, ammonia water was added to adjust the pH to 8.5, and 40 ° C. The mixture was heated and stirred for 3 hours.

The white solid obtained was washed with water and filtered to obtain 12
It was vacuum dried at 0 ° C. After drying, it was baked in air at 550 ° C. to obtain 50 g of hydroxyapatite.

The Ca / P molar ratio of the obtained hydroxyapatite was 1.51.

(2) Preparation of hydroxyapatite by precipitation reaction method 500 m of 12 wt% calcium nitrate tetrahydrate aqueous solution
1 was added dropwise to 500 ml of a 7 wt% ammonium hydrogenphosphate aqueous solution. Ammonia water was added to adjust the pH to 9.0, and the mixture was stirred at room temperature for 24 hours.

The white solid obtained was washed with water, filtered off and
It was vacuum dried at 20 ° C. After drying, 25 g of hydroxyapatite was obtained by baking in air at 550 ° C.

The Ca / P molar ratio of the obtained hydroxyapatite was 1.50.

[0032]

Examples 1 and 2 and Comparative Examples 1 and 2 1 g of various deodorants
It was put in a vacuum gas collection bottle of 1 l, and the inside of the system was evacuated.
Was introduced and vaporized.

Air was introduced into the system to bring it to atmospheric pressure, and it was deodorized at room temperature for 1 hour. The deodorant was taken out and divided into 0.5 g portions, and one part of the mixture was directly extracted with isovaleric acid by alkali extraction and quantified by gas chromatography to determine the adsorption amount of the deodorant per 0.5 g.

The other sample was vacuum degassed at 100 ° C. for 2 hours, and then isovaleric acid was extracted by alkali extraction, and the same determination was carried out to obtain the adsorption amount per 0.5 g of the deodorant after degassing. It was

The vacuum gas collecting bottle was also washed with an alkaline aqueous solution, collected, and similarly quantified to determine the remaining amount.

The deodorization rate and retention rate were determined from the above experimental results.

[0037]

[Equation 1]

[0038]

[Equation 2]

Table 1 shows the results using commercial activated carbon, zinc oxide (special grade reagent), hydroxyapatite prepared by the hydrolysis method, and hydroxyapatite prepared by the precipitation reaction method as the deodorant.

[0040]

[Table 1]

As can be seen from Table 1, hydroxyapatite efficiently and strongly deodorizes lower fatty acids.

[0042]

Industrial Applicability According to the present invention, it is possible to provide a deodorizing agent that efficiently deodorizes lower fatty acids, which are malodorous components, and strongly deodorizes them without re-emission.

Further, since hydroxyapatite itself is white and odorless and has a very high level of safety for the human body, there are few restrictions on its use, and its significance in the field of industrial and household deodorants is great.

Claims (2)

[Claims] 1. A deodorant containing hydroxyapatite. 2. The Ca / P molar ratio of hydroxyapatite is
The deodorant according to claim 1, which is less than 1.67.