JP2847538B2 - Heat evaporation type fumigant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a living room of a building, a kitchen room, a bathroom, a toilet, a changing room, or a vehicle, such as an automobile, an aircraft, a train, a ship, and a poultry house. Insecticides, such as and transport containers,
The present invention relates to a heat-transpiration fumigant used for sterilization, disinfection, fungicide, and the like.

[Prior Art] In recent years, a method of evaporating insecticides, fungicides, fungicides, and the like into a room and performing insecticide, sterilization, and fungicide throughout the room has been put to practical use. As a means for evaporating water, heat generated by electricity, combustion, or chemical reaction is used as a heat source.

Further, a technique of blending an organic foaming agent to promote the volatilization of these chemicals is known.

For example, Japanese Patent Publication No. 60-55481 discloses a technique in which an organic foaming agent is decomposed by a chemical reaction to evaporate an insecticide.

[Problems to be Solved by the Invention] Conventional heat evaporation type fumigants are as described above,
There is a big problem.

The biggest problem is that the volatilization of these chemicals tends to corrode metal products in the room, such as electrical wiring, electronic control boards, ornaments, household goods, and electrical products.

Therefore, this heating-evaporation type fumigant could not be used in a room of a vehicle such as an automobile or a building having many metal products. In particular, when an organic foaming agent is contained as a volatilization enhancer as described above, the decomposition product tends to become a strongly acidic gas such as nitrous acid gas, and the problem of metal corrosion is further increased.

Another disadvantage is that the volatilization rate of these drugs is not high, and the drugs remain in a relatively large amount without being evaporated.

Therefore, although the volatility improver as described above is used, there is a problem of deterioration of metal corrosion, and there is no complete solution.

The present invention has been made for the purpose of developing a heat evaporation type fumigant which does not have such a problem, and can suppress corrosion of metal products and the like, and can be used in vehicles such as automobiles and indoors where many metal products are present. An object of the present invention is to provide a heat-evaporating fumigant that can be used with care and that can evaporate a drug efficiently and increase the volatility as needed.

[Means for Solving the Problems] In order to achieve the above object, the cause of metal corrosion was first sought, and when an insecticide, bactericide, fungicide, etc. was heated and evaporated, acid gas was partially decomposed and the like. It has been found that when the organic foaming agent is decomposed and volatilized, a strongly acidic gas is generated, which is a cause of corrosion of the metal.

Then, various experiments were conducted to suppress the generation of these acidic gases. As a result, it was found that the generation of an acidic gas can be prevented by reducing the effect of the chemical by blending an alkaline agent as an essential component.

In addition, when various formulations were attempted to improve volatility, other than the organic foaming agent, a normal boiling point organic solvent and water are also effective, and these alone or in combination are effective in improving volatility. I found something.

That is, the present invention relates to one or more selected from insecticides, fungicides, fungicides, and alkali metal or alkaline earth metal hydroxides, oxides, silicates, A heat-transpiration fumigant characterized by containing two or more alkaline agents as essential components, and a volatility improver may be added as necessary. It is.

A test for generating an acid gas by evaporation of a chemical and a test for corrosion of a metal plate, which were conducted by the present inventors as preliminary tests, will be briefly described.

A nichrome wire was wound around the outside of a stainless steel heating furnace, and an insecticide, bactericide, and fungicide were put into the heating furnace set at a surface temperature of 280 to 290 ° C, heated, and wet in a place exposed to smoke. When the universal pH test paper and the metal plate were placed, the pH test paper was acidic and the metal plate was discolored or rusted.

When a similar test was conducted by adding an organic foaming agent to these agents, the pH test paper showed strong acidity, and the discoloration and rust of the metal plate were greater than those described above.

A similar test was carried out without the chemical, but the pH test paper showed neutrality, and no discoloration or rust was found on any of the metal plates.

From this test, it was thought that it was necessary to suppress the generation of acid gas, and it was found that mixing of various alkali agents was very effective.

In addition, as a result of the test of the volatility improver, the organic blowing agent, boiling point
They found that organic solvents at 50-300 ° C. and water were effective and made the present invention more useful.

Next, the drug used in the present invention will be specifically described.

First, as insecticides, 5-benzyl-3-furylmethylchrysanthemate (generic name: resmethrin), 3-phenoxybenzyl-2,2-dimethyl-3- (β, β-dichloro) vinylcyclopropanecarboxylate ( Pyrethroid insecticides such as vermethrin), carbamate insecticides such as 1-naphthyl N-methylcarbamate and o-isopropoxyphenyl N-methylcarbamate; o, o-dimethyl-o- (2,2 Organophosphorus insecticides such as -dichloro) vinyl phosphate;

Also as bactericides, cresol, benzalkonium chloride, sulfadiazine, ethyl parahydroxybenzoate,
2-bromo-2-nitropropane-1,3-diol,
Dodecylguanidine hydrochloride, 3-methyl-
4-isopropylphenol, parachloro-metaxylenol, 2,4,4'-trichloro-2'-hydroxydiphenyl ether and the like.

Further, examples of fungicides include α-bromocinamic aldehyde, N-dimethyl-N-phenyl-N ′-(fluorodichloromethylthio) sulfamide, N (fluorodichloromethylthio) -phthalimide, 2-methoxycarbonylaminobenzimidazole, -Methoxycarbonylaminobenzimidazole 4'-n-alkanesulfonate, 2- (4-4 azonitrile) -benzimidazole (hereinafter abbreviated as TBZ), 2,3,5,6-tetrachloro-
4- (methylsulfonyl) -pyridine and the like.

These insecticides, fungicides, and fungicides are naturally essential components for the purpose of fumigation, but they need not necessarily be contained in three types, and only one type may be used depending on the purpose. Alternatively, two or more kinds may be used in combination.

Next, as the alkaline agent used in the present invention, lithium hydroxide, sodium hydroxide, potassium hydroxide, hydroxides such as calcium hydroxide, oxides such as magnesium oxide, lithium carbonate, sodium hydrogen carbonate, sodium carbonate, Examples thereof include carbonates such as sodium hydrogen carbonate, potassium carbonate and potassium hydrogen carbonate, silicates such as sodium orthosilicate and sodium metasilicate, and phosphates such as trisodium phosphate and disodium phosphate.

These alkaline agents are blended as an essential component, and the above-mentioned chemicals and, in some cases, an organic foaming agent which will be described later, are partially decomposed by being heated in a heating and evaporation furnace, and are acidic corrosive. It is needed to neutralize the gas.

By the way, Japanese Patent Publication No. 46-28118 discloses the addition of sodium carbonate, sodium hydrogencarbonate and disodium hydrogenphosphate to an insecticide heating fumigant for the purpose of preventing pungent odor.

Although these carbonates and phosphates are not formulated for the purpose of preventing metal corrosion as in the present invention, they are also contained in the alkali agent used in the present invention described above,
It is considered that a metal corrosion prevention effect is exhibited.

Therefore, in order to maintain the inventive step of the present invention, these "carbonates" and "phosphates" are not described in the claims, but have the effect of preventing metal corrosion. They decided to abandon the bill.

The present invention is a mixture of the above-mentioned chemicals and an alkaline agent as essential components, but both are powdery substances, and thus this mixture is also a powder.

Although this powder mixture can be used as the fumigant of the present invention, an efficient heat-evaporation type fumigant can be obtained by further mixing a volatility improver.

As the volatility improver, an organic foaming agent, a boiling point of 50 to 30
It is effective to use an organic solvent at 0 ° C. and water alone or in combination.

Examples of the organic foaming agent include azodicarbonamide, benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, azobisisobutyronitrile, 2,2'-azobisisobutyramide, and the like.

Examples of the organic solvent having a boiling point of 50 to 300 ° C. include toluene, xylene, methanol, ethanol, isopropyl alcohol, acetone, methyl ethyl ketone, ethyl acetate, ethyl cellosolve, ethylene glycol, diethylene glycol, and turpentine.

Water is also effective as a volatility improver, and may be water alone or a water-soluble solvent selected from the above-mentioned solvents and mixed with water.

In addition, it is desirable not to use an organic foaming agent as much as possible as a volatility improving agent.

The reason is that the organic foaming agent has a good volatile structure, but its decomposition gas is strongly acidic, and it is necessary to suppress the corrosion of this metal product when there is a metal product which is easily corroded. It is.

When an organic solvent is used as a volatility improver, the reason for limiting the boiling point to 50 to 300 ° C. is that if the boiling point is less than 50 ° C., the volatility of the drug cannot be improved because the solvent will volatilize at a low temperature. On the other hand, if a solvent having a boiling point higher than 300 ° C. is used, the solvent itself is unlikely to become a vapor, and the volatility of the drug deteriorates. That is, when the boiling point of the solvent is within the vapor range, the drug is easily volatilized together with the vapor of the solvent.

Since water also has a boiling point of 100 ° C., a similar effect can be obtained.

In the present invention, the compounding ratio of the agent such as an insecticide, a bactericide, and a fungicide and the alkali agent is preferably at least 5 parts by weight or more based on 100 parts by weight of the agent, and usually 5 to 200 parts by weight. Is appropriate. That is,
If the amount of the alkaline agent is less than 5 parts by weight, the neutralization is incomplete and an acidic gas is generated. On the other hand, this alkali agent has no adverse effect even if it is too much.
There is no change in the effect even if it exceeds 200 parts by weight.

When the volatility improver is compounded, the amount is not particularly limited, but is preferably 10 to 100 parts by weight with respect to 100 parts by weight of the drug. The ratio of this volatile improver is 10
If the amount is less than parts by weight, the effect of improving volatility is reduced, while
Even if it exceeds 100 parts by weight, the volatility is not further improved.

[Effect] The present invention has the above-mentioned constitution, and when evaporating a drug, the compounded alkaline agent neutralizes an acid gas generated by partial decomposition of the drug and the like, so that the acid gas does not volatilize. It works.

Therefore, there is no need to worry about corroding metal products.
It can be used safely for fumigation in vehicles such as automobiles and other indoor areas with many metal products, and the fumigation effect of the drug itself is not reduced.

When a volatility improver is used, the vaporization of water or an organic solvent or the decomposition and foaming of an organic foaming agent facilitates the volatilization of the chemical, thereby achieving efficient vapor deposition.

Means for evaporating the fumigant of the present invention may be a conventionally unknown method, an electric heating method, a combustion method,
Alternatively, the container containing the fumigant of the present invention may be heated to the temperature required for fumigation (usually about 260 to 320 ° C.) by a chemical reaction method.

The fumigant of the present invention may contain, as other components, for example, the addition of a deodorant that gives deodorant properties, the addition of a fragrance for the purpose of perfuming, the addition of a fungicide that imparts a rust-preventive function, and the like. Of course, it is also good.

[Example] A nichrome wire was wound around a stainless steel container having a diameter of 38 mm and a depth of 286 mm so that the surface temperature of the container could be heated to a set temperature of 280 to 290 ° C.

The stainless steel container was placed in a wooden box having a length of 40 cm, a width of 40 cm, and a height of 60 cm, which was used as an experimental device.

Into this stainless steel container, various pH test papers, copper plate, brass plate, zinc steel plate, aluminum plate, which were filled with chemicals having various compositions as shown in Tables 1 and 2 and were wetted 20 cm above the stainless steel container with water. , Iron plate, suspended.

The stainless steel container was then heated at the above set temperature for 10 minutes to evaporate the drugs and test the pH of the smoke and the corrosion of the metal plate.

The abbreviations in the table indicate the following substances, which are used similarly in the following tables.

Resme… Resmethrin Para-para… Ethyl paraoxybenzoate FCF… N (fluorodichloromethylthio) phthalimide ABN… Azobisisobutyronitrile The abbreviations in the table indicate the following substances, and are used in the same manner in the following tables.

Charcoal Na: Sodium carbonate Water Ca: Calcium hydroxide Water Na: Sodium hydroxide Carbon water Na: Sodium hydrogencarbonate Results of tests on the above comparative examples (Table 1) and Examples (Table 2) Tables 3-4 Shown in

 The evaluation of the corrosiveness was performed as follows.

○: No discoloration and rust △: Discoloration ×: Large discoloration From the results of this comparative example, it can be seen that when no alkali agent is blended, the acid gas is volatilized from any of the agents and the metal plate is easily discolored.

Also, when azobisisobutyronitrile is used as the volatility improver, a strongly acidic gas is generated, and it is determined that the metal is more easily corroded than when water is used as the volatility improver.

From this table, it can be seen that the addition of the alkaline agent almost suppresses the volatilization of the acidic gas and hardly causes corrosion of the metal plate.

In addition, even if azobisisobutyronitrile is used as a volatility improver, there is no problem if the alkali agent is increased (Examples 1 → 3), and even if the volatility improver is not contained (Example 6, 7) It is clear that metal corrosion is suppressed and that water may be used as a volatility improver (Example 5).

Next, it was tested how the volatilization rate of the drug changes depending on the presence or absence of the volatilization enhancer and its type and amount.

The test method was as follows. Using the same experimental apparatus as above, the drugs with various compositions shown in Table 5 were added, and the volatilization rate of the drugs when heated at the same set temperature for 10 minutes was determined.

 The results of the volatilization rate are shown at the bottom of Table 5.

The abbreviations in this table indicate the following substances, which are also used in the following tables.

TCH: 2,4,4'-trichloro-2'-hydroxydiphenyl ether ACA: azodicarbonamide EG: ethylene glycol (boiling point: 197 ° C) DEG in the table is diethylene glycol (boiling point: 245
° C).

From Table 5, it can be seen that Examples 9 and 10 in which a volatility improver was added as compared with Example 8 of the fungicide containing no volatility improver.
The volatilization rate has greatly improved. Example 11
In the fungicides 12 and 12, the volatilization rate differs depending on the presence or absence of water as a volatility improver, and it is recognized that water is effective. Furthermore, according to Examples 13 to 15, the volatility improvement rate by increasing the amount of the volatility improver is not so high, and it is important to mix the volatility improver, and the amount is at least 10% based on the drug. If there is, it is determined to be effective.
In addition, the antifungal agent TBZ has a very low divergence without the volatility improver, but the volatility is improved even when a volatile compound having a high boiling point is blended.

In addition, in Example 11 without the volatility improver, an experiment was also conducted for the case where no alkali agent was added, but the volatility did not change at all, and it was recognized that the alkali agent blending did not affect the volatility.

[Effect of the Invention] The effect of the present invention is that the conventional heat-evaporation type fumigant has a problem that an acid gas is generated due to partial decomposition of a chemical and the like, and the metal product in contact with the smoke is corroded. It is an object of the present invention to provide a novel heat-evaporating fumigant capable of suppressing the volatilization of an acid gas without lowering the effect of a chemical and preventing corrosion of a metal product.

As a result, the fumigant of the present invention can be used safely even in vehicles such as automobiles and indoors where there are many metal products.

The present invention also has a feature that the agent can be efficiently evaporated by blending a volatility improver as required.

As described above, the present invention has excellent effects and further expands the use of the heat-evaporation type fumigant, and its usefulness is enormous.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-130501 (JP, A) JP-A-56-115685 (JP, A) JP-A-58-210831 (JP, A) JP-A-50-108 142725 (JP, A) JP-B-46-28118 (JP, B1) JP-B-42-9280 (JP, B1) JP-B-43-11316 (JP, B1) (58) Fields surveyed (Int. Cl. ⁶ , DB name) A01N 25/18 CA (STN) REGISTRY (STN) WPIDS (STN)

Claims (4)

(57) [Claims] 1. One or more agents selected from insecticides, fungicides and fungicides and one or two selected from hydroxides, oxides and silicates of alkali metals or alkaline earth metals.
A heat-transpiration fumigant comprising at least one or more kinds of alkaline agents as essential components. 2. The heat-evaporating fumigant according to claim 1, wherein a volatility improver is added to a mixture of the drug and the alkali agent. 3. The heat-transpiration fumigant according to claim 1, wherein the alkali agent is at least 5 parts by weight or more based on 100 parts by weight of the drug. 4. An organic foaming agent, wherein the volatility improver has a boiling point of 50 to 300.
The heat-evaporation type fumigant according to claim 2, wherein the heat-evaporation type fumigant is at least one member selected from the group consisting of an organic solvent at 0 ° C and water.