JPH105321A - White deodorant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a white deodorant which is effective to malodorous gases and more particularly aldehydes, such as acetoaldehydes, which is the essential components of tobacco smell, is white, is excellent in thermal stability and is, therefore, compoundable wit various kinds of deodorant processed goods of plastics, paper, fibers, etc. SOLUTION: This deodorant is formed by intercalating arom. amine, such as aniline, between the layers of hardly soluble phosphate having a laminar structure. The hardly soluble phosphate having the laminar structure is the compd. expressed by the general formula MIV(HPO4 )2 .nH2 O (where, MIV denotes a quadrivalent metal, n=0 to 2) and the dihydrogen aluminum dihydrate triphosphate expressed by the chemical formula AlH2 P3 O10 .2H2 O.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorant gas for deodorizing gas, and more particularly to a deodorant for aldehydes such as acetaldehyde which is a main component of tobacco odor. Further, since it is white, the processed product can be freely colored even when it is mixed with various deodorized processed products.

2. Description of the Related Art In recent years, one of the most problematic odors in daily life is cigarette odor. The tobacco odor is composed of an extremely large number of components, but it is said that aldehydes such as acetaldehyde cause the most unpleasant odor. As sorbents for aldehydes such as acetaldehyde, aniline (JP-B-60-54095),
Inorganic acid aniline salts (JP-A-2-52043), organic carboxylic acids and organic amines (JP-A-5-317703),
Activated carbon impregnated with metal acetate (JP-A-7-171384) and the like are effective, and are considerably used in air purifiers indoors or in vehicles.

However, since activated carbon to which aniline or the like is impregnated is black and cannot be freely colored, it is hardly noticeable for applications such as filters for air purifiers. Was. The present invention has been made in view of such conventional problems, and is excellent in deodorizing property for aldehydes such as acetaldehyde, and has high persistence of deodorizing effect and high heat stability. An object of the present invention is to provide a deodorant.

Means for Solving the Problems In order to achieve the above object, the present inventors have made intensive studies and found that an aromatic amine such as aniline is intercalated between layers of a poorly soluble phosphate having a layered structure. In addition to having excellent deodorizing performance against aldehydes such as acetaldehyde, it has been found that a deodorant having many advantages such as whiteness, persistence, and heat stability can be obtained. It has been reached. That is, the white deodorant of the present invention is characterized in that an aromatic amine such as aniline is intercalated between layers of a poorly soluble phosphate having a layered structure. Examples of the aromatic amine in the present invention include aniline, benzylamine, toluidine, naphthylamine, phenylenediamine and the like. Examples of the poorly soluble phosphate having a layered structure include acidic phosphates of tetravalent metals such as zirconium phosphate and titanium phosphate and aluminum dihydrogen triphosphate dihydrate, alone or in combination of two or more. Can be mixed and used. Acid phosphates of tetravalent metals are described in Clearfi
eld, G .; Alberti and U.S.A. Costant
ino, “Inorganic Ion Exchan
Ge Materials, "A. Clearfield
d, CRC Press, USA, Chapter 3 (198
The outline is described in 2), but the general formula M ^IV (HPO
₄₎ ^{M IV} of ₂ · _{nH 2} O (wherein represents a tetravalent metal .n
= 0 to 2) and α of monohydrate (n = 1)
The type, the gamma type of dihydrate (n = 2) and the like are generally well known. Further, triphosphate aluminum dihydrogen dihydrate is represented by the formula _{AlH 2 P 3 O 10 · 2H} 2 O. The layer structure of the sparingly soluble phosphate is formed by stacking unit crystal layers on each other. The bonds between the crystal layers are relatively weak, and various ions, molecules or compounds can be intercalated between the layers without destroying the layered structure, and the properties of the original poorly soluble phosphate can be changed. I can do it. In addition, ions, molecules or compounds intercalated between the layers have improved thermal stability, (weather) light resistance, solvent resistance, chemical resistance, and the like. The white deodorant of the present invention utilizes these properties of a poorly soluble phosphate having a layered structure. That is, by intercalating an aromatic amine such as aniline, a sparingly soluble phosphate is provided with deodorizing performance against aldehydes such as acetaldehyde. In addition, thermal stability, weather resistance, solvent resistance, etc. are improved by the intercalation of aromatic amines such as aniline between the layers of poorly soluble phosphates. Also appears. In the present invention, in order to intercalate an aromatic amine such as aniline between layers of a poorly soluble phosphate having a layered structure, any of water or an organic solvent may be used, and a method such as stirring at room temperature to high temperature may be used. It can be easily done by contacting with. After the aromatic amine such as aniline is intercalated between the layers of the poorly soluble phosphate having a layered structure, the solid phase is separated by filtration and washed to remove unreacted aromatic amine such as aniline. After drying, a poorly soluble phosphate having a layered structure in which an aromatic amine such as aniline is intercalated between layers,
That is, the white deodorant of the present invention is obtained. In the present invention, the reaction in which the aromatic amine such as aniline intercalates between the layers of the poorly soluble phosphate having a layered structure,
It is mainly bonding to protons existing between layers, and is chemisorption.

Next, the present invention will be described in detail with reference to examples. However, the present examples are described for illustrative purposes only, and the scope of the present invention is not limited by these examples. The sparingly soluble phosphate having a layered structure used in the examples was α-type zirconium phosphate Zr (HPO ₄ ) _2.
H ₂ O, γ-type titanium phosphate _{Ti (HPO 4) 2 · 2H} 2
O, aluminum dihydrogen triphosphate dihydrate AlH ₂ P ₃
In O ₁₀ · 2H ₂ O, respectively α-ZrP, γ-Ti
Abbreviated as P or AlP. Aniline was used as the aromatic amine. Example 1 (Production of white deodorant) To 100 ml of a 2% aniline aqueous solution, 3 g of a poorly soluble phosphate having a layered structure was added, and the mixture was stirred for about 4 hours to separate a solid phase.
It was manufactured by washing with water to remove unreacted aniline and drying at 110 ° C. Further, in order to confirm that aniline was intercalated, the interlayer distance was measured by a powder X-ray diffraction method. FIG. 1 shows a powder X-ray diffraction pattern of AlP, and FIG. 2 shows a powder X-ray diffraction pattern of AlP in which aniline was intercalated. Whether or not intercalation is performed can be confirmed by moving the peak position (minimum angle) indicating the interlayer distance of AlP to the lower angle side, that is, increasing the interlayer distance. Referring to FIG. 1, the peak position indicating the interlayer distance of AlP is 2θ = 11.2 °, but by intercalating aniline, the peak position indicating the interlayer distance is 2θ as observed in FIG. = 4.7 ° to the low angle side. Table 1 shows the change in the interlayer distance of the poorly soluble phosphate having a layered structure in which aniline was intercalated, which was obtained by the powder X-ray diffraction method. In each case, the interlayer distance is increased, and it can be confirmed that the layers are intercalated.

[Table 1] Example 2 (Deodorizing performance test) 0.5 g of the white deodorant of the present invention obtained in Example 1 and 3 L of acetaldehyde gas adjusted to 50 ppm were placed in a 3-liter odor bag, and the acetaldehyde concentration was changed. Was measured using a gas detector tube. Table 2 shows the results. The same test was carried out for a poorly soluble phosphate having a layered structure before intercalating aniline as a control and for a commercially available activated carbon for deodorizing acetaldehyde as a comparison. It can be seen that by intercalating aniline with each phosphate, a deodorizing effect is exhibited on acetaldehyde, and it is understood that the phosphate has the same or better performance as compared with commercially available activated carbon.

[Table 2] Example 3 (Confirmation of Improvement of Thermal Stability) In order to confirm that the thermal stability of intercalated aniline is improved, the white heat deodorant of the present invention obtained in Example 1 was subjected to a differential heat / Thermobalance measurement (hereinafter DTA-
TG). FIG. 3 shows AlP as a control,
Figure 4 shows the DT of AlP with aniline intercalated.
An A-TG curve is shown respectively. DTA- of AlP shown in FIG.
Looking at the TG curve, there is a weight loss presumably due to the elimination of water of crystallization up to about 150 ° C., and thereafter a weight loss due to intramolecular dehydration is observed at about 530 ° C. On the other hand, DTA-TG of AlP with aniline intercalated
Looking at the curve (FIG. 4), an endotherm near 230 ° C. and an exothermic peak near 300 ° C. with a weight loss likely due to aniline are observed. The boiling point of aniline is 183 ° C
However, it can be understood that the vaporization temperature was increased to 230 ° C. (improved thermal stability) by being strongly held between the layers by the intercalation. The exothermic peak around 300 ° C. is considered to be due to the thermal decomposition of the intercalated aniline. Table 3 shows the results of DTA-TG measurement of the poorly soluble phosphate having a layered structure in which aniline was intercalated, that is, the white deodorant of the present invention obtained in the examples. It is indicated by the temperature of the accompanying endothermic or exothermic peak. In each case, the temperature was higher than the boiling point of aniline, indicating that the thermal stability was improved.

[Table 3]

As described above, since the white deodorant of the present invention is white and has excellent heat stability, it can be used not only as a powder or a granular material but also in various types. By adding and processing to a base material such as plastic, paper, or fiber, the application range can be expected to be very wide, such that deodorant performance can be imparted without changing the color of the base material.

[Brief description of the drawings]

FIG. 1. Aluminum dihydrogen triphosphate dihydrate (Al
It is a powder X-ray diffraction pattern of P).

FIG. 2 is a powder X-ray diffraction pattern of aniline intercalated AlP obtained in Example 1.

FIG. 3. Aluminum dihydrogen triphosphate dihydrate (Al
It is a DTA-TG curve of P).

4 is a DTA-TG curve of aniline intercalated AlP obtained in Example 1. FIG.

Claims (2)

[Claims] 1. A white deodorant characterized in that at least one aromatic amine is intercalated between layers of a poorly soluble phosphate having a layered structure. 2. The poorly soluble phosphate having a layered structure is represented by the general formula M ^IV (HPO ₄ ) ₂ .nH ₂ O (M ^{IV in the} formula
Represents a tetravalent metal. 2. The compound according to claim 1, which is at least one selected from a compound represented by n = 0 to 2) and aluminum dihydrogen triphosphate dihydrate represented by a chemical formula: AlH ₂ P ₃ O ₁₀ .2H ₂ O. White deodorant.