JP3706202B2 - Gaseous substance detector and gaseous substance detection method using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a detector for detecting whether or not a gaseous substance is present in the atmosphere or in a closed space, and a method for detecting a gaseous substance using the same, and more particularly, an insect repellent, a fragrance, and an insecticide. The present invention relates to a gaseous substance detector that detects the presence or absence of a gaseous substance that is volatilized from a color tone, and a detection method using the same.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in preparations that volatilize volatile substances such as insect repellents (volatilized preparations), a method is known in which the end point of volatilization is visually determined by using a color change using a pigment. For example, a volatile substance and a pigment are held in a volatile preparation, and the color change of the volatile preparation caused by volatilization / disappearance of the volatile substance is visually observed (Japanese Patent Laid-Open No. 1-161081), a volatile substance, an electron donating type Proposals have been made of holding a color developing organic compound and a developer in a volatilization preparation and utilizing the change in color of the volatilization preparation due to volatilization / disappearance of the volatile substance (Japanese Patent Laid-Open No. 62-163965). ing.
[0003]
However, these methods cannot be applied to a formulation with a structure where the volatilization formulation is not visible from the outside, and when the volatilization formulation itself is originally colored, such as when the volatilization liquid is impregnated into wood. There was a drawback that the color change became unclear.
[0004]
On the other hand, the method of directly detecting the volatilized gaseous substance is a preferable method for solving the above-described drawbacks. Specifically, as a method for detecting a gaseous substance using a dye, (a) a functional dye film (JP 63-234136, JP 5-296934, etc.), an acid luminescent dye, and an acid developer A substance detection film (Japanese Patent Laid-Open No. 3-251747) composed of an agent and a film-forming polymer substance is installed between the light emitting part and the light receiving part to optically change the adsorption spectrum due to adsorption to the gaseous substance on the film. And (b) a method of visually detecting an electron-accepting substance with a resin composition containing an electron-donating color-forming organic compound (Japanese Patent Laid-Open No. 5-320616) has been proposed.
[0005]
[Problems to be solved by the invention]
However, the method (a) requires a complicated apparatus, and the method (b) has a drawback that the gaseous substance to be detected is limited. Therefore, a method for detecting a wider range of gaseous substances with a simpler method has been desired.
[0006]
[Means for Solving the Problems]
As a result of intensive studies on a method for detecting a gaseous substance using a dye, the present inventors have found that a detection body in which an electron-donating color developing organic compound and a developer are held in a holding body is a gaseous substance. The present invention has been completed by discovering that in an existing atmosphere, it is decolored or decolored due to a desensitizing action, and develops color in an atmosphere in which no gaseous substance is present.
[0007]
That is, the present invention relates to a gaseous substance detector comprising an electron-donating color-developing organic compound and a non-volatile color developer held by a holder, and showing the absence of a gaseous substance by color development and the use thereof The present invention provides a method for detecting a gaseous substance.
[0008]
Examples of the carrier used in the gaseous substance detector of the present invention (hereinafter referred to as “gas detector”) include paper, nonwoven fabric, cloth, wood, pulp, cellulose, unglazed porous carriers, polyvinyl acetate, Polymer substances such as vinyl chloride and polyethylene, and organic compounds such as paraffin are used. Among these, in particular, when a carrier capable of flowing gas, such as a porous carrier, is used, the reactivity between the gas to be detected, the electron donating color developing organic compound, and the non-volatile developer is increased, and detection is performed. It is preferable because the sensitivity is increased.
[0009]
Examples of the electron-donating color-forming organic compound (hereinafter referred to as “color-forming compound”) used in the present invention include triphenylmethane phthalides, fluorans, phenothiazines, indolyl phthalides, spirofurans, and leucos. Examples include auramines, rhodamine lactams, and the like, for example, crystal violet lactone, malachite green lactone, 3-diethylamino-6-methylfluorane, 3-diethylamino-7-chlorofluorane, 1,3,3-trimethylindoline. -2,2-spiro-6'-nitro-8'-methoxybenzopyran, benzoylleucomethylene blue, and the like can be used. These coloring compounds may be used alone or in combination of two or more.
[0010]
Further, as the non-volatile developer (hereinafter referred to as “developer”) used in the present invention, various non-volatile developers capable of developing a color by opening the lactone ring, lactam ring, spiro ring, etc. of the color developing compound. A volatile acidic developer can be used, and an organic developer that is a compound having a phenolic hydroxyl group and an inorganic developer that is a weakly acidic solid acid are particularly preferable. Among these, examples of the compound having a phenolic hydroxyl group include bisphenol A, bisphenol S, 2,2′-methylenebis (4-chlorophenol), 4,4′-dihydroxybenzophenone, 4,4′-thiodiphenol, 4 , 4′-methylenebis (2,6-di-t-butylphenol), 4,4′-biphenol, p-phenylphenol, p-cumylphenol, 4-t-butylcatechol, 3,5-di-t- Butylcatechol, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, p-hydroxybenzoic acid butyl, p-hydroxybenzoic acid benzyl, methyl gallate, gallic acid Ethyl acid, propyl gallate, octyl salicylate, phenyl salicylate, Examples include ethyl protocatechuate, t-butylhydroquinone, t-butylhydroxyanisole, 2,6-di-t-butyl-4-methylphenol, and the like. On the other hand, examples of the weakly acidic solid acid include silica, alumina, clay, kaolin and bentonite. It is desirable that this developer has a small volatility and at least an effective amount remains at the end of use.
[0011]
As described above, the gas detector of the present invention uses a porous carrier, a polymer substance, an organic compound, etc. as a holding body, and these are mat-like, sheet-like, film-like, powdery, chip-like, paste-like, etc. It can be used in an appropriate dosage form. Further, when an inorganic developer is used as the developer, the developer itself is directly or sintered into a mat or the like to form a holding body, and a coloring compound is held on this to form a gas detector. You can also In the case where the developer itself is used as a holding body, it is preferable that the amount of the coloring compound is determined by considering this as the holding body.
[0012]
As a method of holding the coloring compound and the developer on the holder, both components are dissolved in an organic solvent such as alcohol, ether, and acetone, and the holder is dropped, dipped, sprayed, printed, or brushed. , After mixing and dissolving, evaporate the solvent, dissolve both components and polymer substance in organic solvent, apply on the base such as glass plate by spinner method or dipping method, then evaporate the solvent Examples thereof include a method, a method of melt-kneading both components and a polymer substance. At this time, an appropriate binder can also be used in order to enhance the adhesion of the coloring compound and the developer to the holding body. Furthermore, an ultraviolet absorber etc. can also be added as needed.
[0013]
In the gas detector of the present invention, it is preferable to hold about 0.0001 to 5 parts by weight of the coloring compound with respect to 100 parts by weight of the holding body. The amount is preferably about 0.1 to 50 parts by weight with respect to parts by weight.
[0014]
Examples of gaseous substances detected by the gas detector of the present invention include alcohols such as methanol, ethanol, octanol, linalool, geraniol, benzyl alcohol, and phenethyl alcohol, and ketones such as acetone, methyl amyl ketone, menthone, carvone, and camphor. Aldehydes such as acetaldehyde, octyl aldehyde, benzaldehyde, citral, perilaldehyde, ethers such as diethyl ether, tetrahydrofuran, dibenzyl ether, cineol, anisole, linalool oxide, geranyl formate, ethyl acetate, linalyl acetate, isoamyl propionate , Esters such as benzyl propionate, citronellyl butyrate and ethyl salicylate, ammonia, diethylamine, triethylamine, Mention may be made of a wide range of materials such as amines such as doll.
[0015]
In addition, these substances and other substances that exhibit useful effects in the gas phase, such as natural and synthetic fragrances, insecticides such as empentrin, insecticides such as DDVP, N, N-diethyl-m-toluamide, etc. Repellents, attractants such as (Z) -11-hexathesenal, antibacterial and antifungal agents such as α-bromocinnamaldehyde, and the like can also be detected.
[0016]
The ease of detection of these substances varies depending on the structure of the substance, the vapor pressure, and the like, but in general, a substance having a higher vapor pressure is easier to detect. For example, linalool is a particularly effective detection target. Therefore, if the detector of the present invention is used, endpoints of preparations containing these substances, that is, fragrances, insect repellents, insecticides, and the like can be visually determined by color change.
[0017]
[Action]
The gas detector of the present invention detects the presence of a gaseous substance by holding a coloring compound and a non-volatile developer on a holder and eliminating this color by the action of the gaseous substance. .
In this way, a simple detector that simply holds the color developing compound and the developer on the holding body is desensitized by the gaseous substance, and the phenomenon that the color develops again due to the disappearance of the gaseous substance It is surprising and unexpected.
[0018]
【The invention's effect】
The gas detector of the present invention can visually detect a wide range of substances by a simple method, and can determine the end points of fragrances, insect repellents, insecticides, and the like by color change.
[0019]
【Example】
EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not restrict | limited at all by these Examples.
[0020]
Example 1
0.1 g of crystal violet lactone and 0.5 g of bisphenol A were dissolved in 100 g of acetone. A filter paper having a diameter of 55 mm was immersed in this solution and then taken out to evaporate acetone to prepare a blue gas detector.
The detector was placed in a 500 ml wide-mouthed bottle adjacent to a 50 ml beaker containing 1 g of ethanol and capped. When observed 1 day later, the detector was decolored and white. When the detection body was taken out from the wide-mouthed bottle and left to stand for observation after 3 days, the detection body returned to blue.
[0021]
Example 2
In the same experiment as in Example 1, the following substances were placed in a wide-mouth bottle together with the detector in place of ethanol, and the degree of decoloration was observed after 1 day and 3 days. As a result, the white color that disappeared after 1 day was linalool, carvone, camphor, acetophenone, citral, perilaldehyde, anisole, linalool oxide and ethyl acetate, and the white color disappeared after 3 days. Benzaldehyde, linalyl acetate, benzyl propionate and ethyl salicylate. After confirming decoloring, these detectors were taken out from the wide-mouth bottle and allowed to stand, and when they were observed after 3 days, all of them returned to blue.
[0022]
Example 3
One polyester film of 8 cm square and two polyethylene films were stacked one on top of the other, and the surrounding three sides were heat-sealed to prepare a packaging bag consisting of two chambers. A gas detector similar to that in Example 1 was placed in a chamber made of double-sided polyethylene film in this packaging bag, and 11 g of impregnated wood chips impregnated with 3 g of linalool was placed in the other chamber, and then the inlet was heat-sealed to repel the insect pest. Was prepared. When this repellent was put in a gas impermeable film bag and stored at 25 ° C., the gas detector was decolored and turned white after 24 hours. Thereafter, the repellent was taken out from the bag of the gas-impermeable film and left in a thermostatic chamber at 25 ° C. to volatilize linalool. As a result, the detector became blue as the linalool disappeared.
[0023]
Example 4
In the same experiment as in Example 3, instead of linalool, the following substances were used: carvone, camphor, acetophenone, citral, perilaldehyde, anisole, linalool oxide and ethyl acetate. As a result, in any case, the detector was white in the presence of the substance, and the composition returned to blue as it disappeared due to the volatilization of the substance.
[0024]
Example 5
0.1 g of crystal violet lactone was dissolved in 100 g of acetone. In 1 g of this solution, 1 g of spherical alumina having a particle size of 1 to 2 mm (manufactured by Cataler Industries, Ltd .; JAC-N150) was immersed and taken out to evaporate acetone to prepare a blue spherical gas detector.
This detector was sealed in a polyethylene film bag, placed in a 500 ml wide-mouth bottle adjacent to a beaker with an internal volume of 50 ml containing 1 g of acetone, and capped. When observed one day later, the detector was decolored and white. When the detection body was taken out from the wide-mouthed bottle while being enclosed in the bag and was observed after 3 days, the detection body returned to blue.
that's all

Claims (4)

The following components (A) and (B)
(A) Triphenylmethanephthalides, fluorans, phenothiazines, indri Ruphthalides, spirofurans, leucooramines or rhodamine lactams Electron-donating color-forming organic compound selected from
(B) A non-chemical compound that has either a phenolic hydroxyl group or a weakly acidic solid acid Volatile developer
In the atmosphere where the gaseous substance is present, decoloring or decoloring due to the desensitizing action of the gaseous substance, and coloring due to the disappearance of the gaseous substance. A gaseous substance detector that detects the presence.   The gaseous substance detector according to claim 1, wherein the holding body is capable of gas flow.   The gaseous substance detector according to claim 1, wherein the holding body is a porous carrier. The following components (A) and (B)
(A) Triphenylmethanephthalides, fluorans, phenothiazines, indri Ruphthalides, spirofurans, leucooramines or rhodamine lactams An electron-donating color-forming organic compound selected from
(B) A non-chemical compound that has either a phenolic hydroxyl group or a weakly acidic solid acid Volatile developer
Is held by the holding body, and the holding body is placed in an atmosphere in which the gaseous substance is present, thereby fading or decoloring due to the desensitizing action of the gaseous substance, and coloring by the disappearance of the gaseous substance. The gaseous substance detection method which detects presence of the said gaseous substance by.