JP2000204358A - Prevention of aerosol gas leakage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent aerosol gas leakage even in the case that an aliphatic hydrocarbon is employed as a solvent when the aerosol includes dimethyl ether. SOLUTION: When dimethyl ether is filled as a liquefied gas in an aerosol can having a resin and/or rubber component, the method for preventing aerosol gas leakage is to fill an aliphatic hydrocarbon such as kerosene in the can and to include dimethyl ether in a quantity of <=40 wt.% based on the total weight of liquefied gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for preventing gas leakage from an aerosol, and more particularly to a method for preventing gas leakage from an aerosol containing dimethyl ether.

[0002]

2. Description of the Related Art Conventionally, it has been known that aerosol has a problem that a gas leaks from a seal portion or a gasket portion of a container and the quality is changed, or that proper injection cannot be obtained. . Therefore, various measures have been studied to prevent aerosol gas leakage. For example, it is known to apply and fix a fluororesin on the surface of a gasket forming material. However, when dimethyl ether is contained as a gas in the aerosol, since dimethyl ether promotes deterioration of gaskets and the like, gas leakage is likely to occur thereby, and it is necessary to consider means for preventing the leakage. .

Therefore, as a method for preventing gas leakage of an aerosol containing dimethyl ether, the use of chloroprene rubber, ethylene-propylene rubber, ethylene-propylene terpolymer rubber, or the like as a packing and sealing material has been studied. In addition, in an aerosol containing dimethyl ether, when an aliphatic hydrocarbon is used as a solvent, deterioration of a gasket or the like becomes more intense than when alcohol is used, and there is a problem that gas leakage is further increased. Means for preventing this are desired.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present inventors have developed a method for effectively preventing aerosol gas from leaking even when an aliphatic hydrocarbon is used as a solvent in an aerosol containing dimethyl ether. It is intended to provide a means.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies to satisfy the above-mentioned problems, and as a result, have found that the above-mentioned problems are satisfied by the following method, and have reached the present invention. (1) In a method for preventing gas leakage of an aerosol in which dimethyl ether is filled as a liquefied gas in an aerosol can having a resin and / or rubber member, the can is filled with an aliphatic hydrocarbon and the content of the dimethyl ether is increased. The aerosol gas leakage to 40% by weight or less based on the total weight of the liquefied gas. (2) The method for preventing gas leakage of an aerosol according to the above (1), wherein the aerosol is a full-amount injection type.

In the present invention, the leakage of gas from the aerosol can be effectively prevented. However, as a matter of course, the basic performance of the aerosol (for example, the explosive property and flammability are sufficiently low, and the Pressure) can also be fully satisfied. Further, rust peculiar to the can can be prevented, and gas leakage due to rust can also be prevented.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The method for preventing gas leakage from an aerosol according to the present invention is intended to prevent gas leakage from a resin and / or rubber member such as a gasket or stem rubber in an aerosol can. In an aerosol containing hydrogen, an effect of effectively preventing gas leakage is exhibited. Further showing the usefulness of the present invention, in the conventional aerosol containing dimethyl ether and aliphatic hydrocarbon, the amount of gas leakage is relatively large, and gas leakage of about 5 to 10 g / year has occurred. . According to the present invention, the amount of gas leakage is significantly reduced,
It is prevented by about 2 to 2 g / year.

In the present invention, liquefied gas includes dimethyl ether (hereinafter DME) and liquefied petroleum gas (hereinafter L)
PG) and the like, and the content of DME is set to 40% by weight or less based on the total weight of the liquefied gas. The DME in the liquefied gas in the present invention preferably contains at least an amount capable of dissolving the water in the aerosol can and preventing the generation of rust in the aerosol can, for example, preferably about 10% by weight or more. This can prevent rust from occurring in the metal container due to moisture in the aerosol can, and can prevent gas and other contents from leaking due to rust. Among liquefied gases, DME is excellent in safety. Therefore, its content is preferably 10 to 3 with respect to the total weight of the liquefied gas.
It is preferably 0% by weight, more preferably about 20% by weight.

[0009] In a preferred embodiment of the liquefied gas, LPG is added in a weight ratio of at least 1 to the above-mentioned DME range.
It is good to be 5 times or more, preferably 4 times or more.

If the above conditions are satisfied, DME, L
In addition to PG, CFC-11, CFC-12, CFC-
113, CFC-114, HCHC-22, HCHC-
Chlorofluorocarbon gas such as 123, HFC-134a; compressed gas such as nitrogen, carbon dioxide gas, compressed air and the like may be used in combination as a propellant.

[0011] In the present invention, the liquefied gas acts as a propellant, and is 30 to 70 parts by weight based on the total weight of the contents of the aerosol.
% By weight, more preferably 60 to 70% by weight. In the present invention, the aerosol means an aerosol can filled with a liquefied gas and other aerosol contents including the following aerosol stock solution.

The aliphatic hydrocarbon in the present invention includes:
Examples include paraffinic hydrocarbons and unsaturated aliphatic hydrocarbons, such as kerosene, i-pentane, n-pentane, cyclopentane, hexane and the like. Among them, kerosene is preferable. For example, neothiozole (manufactured by Chuo Kasei), Isopar M (manufactured by Esso), O-
Solvent M (manufactured by Nippon Oil Co., Ltd.) and the like.

[0013] These aliphatic hydrocarbons are usually used as a solvent in a stock solution of aerosol, and can be used as a target aerosol by containing various agents described below. Further, i-pentane, n-pentane, and the like may also function as a propellant.

In the present invention, the solvent which can be used in combination with the aliphatic hydrocarbon includes aromatic hydrocarbons,
Examples thereof include halogenated hydrocarbons, alcohols, ethers, and esters. Examples of these solvents include aromatic hydrocarbons such as benzene, toluene, and xylene; halogenated hydrocarbons such as dichloromethane and carbon tetrachloride; alcohols such as ethanol, isopropyl alcohol, ethylene glycol, and butyl diglycol; Ethers such as methyl ethyl ketone and diethyl ether: examples include esters such as ethyl acetate and isopropyl myristate. In addition, nitriles such as acetonitrile: amides such as dimethylformamide: vegetable oils such as soybean oil and cottonseed oil, and water can be used. Further, these mixed solvents may be used. The content of the solvent in the aerosol contents in the present invention may be any amount as long as the effects of the present invention can be obtained, but is preferably 20 v / v% to 60 v / v% in the aerosol contents as a guide. . In this solvent, the content of the aliphatic hydrocarbon may be appropriately set, and all of the content may be an aliphatic hydrocarbon.

As the drug, for example, insecticide, repellent,
And insecticides, fungicides, fungicides, deodorants, fragrances and the like. Further, as long as the present invention can be carried out, a surfactant, a dissolution aid, an antioxidant, a stabilizer, a synergist, an ultraviolet absorber, various solvents and the like may be used in combination.

The present invention is particularly useful in aerosols including aerosol stock solutions of kerosene containing insecticides, repellents or repellents as agents.

Here, examples of the insecticide include pyrethroid insecticides, organophosphorus insecticides, carbamate insecticides, and the like. Examples of pyrethroid insecticides include framethrin, cyphenothrin, phenothrin, permethrin, resmethrin, allethrin, phthalthrine, empentrin, tefluthrin, praletrin, imiprothrin, transfluthrin (benfluthrin), pyrethrin, dl-d-T80-T-80-allethrin, -Phthalthrine, d-T80-resmethrin, d-T80-
Flamethrin, tralomethrin, empensulin and the like.

Examples of the organophosphorus insecticide include fenitrothion, chlorpyrifos, marathon, dichlorvos, pyridafenthion, and trichlorfon. Examples of the carbamate insecticide include carbaryl, benfracarb, propoxur, methoxadiazone and the like.

Examples of the insecticide include insect juvenile hormones such as methoprene, antijuvenile hormones such as plecosene, pest hormones such as moulting hormones such as ecdysone, and antihormones. And fipronil and sulfuramide.

In the present invention, other insecticides include
Hinoki, cedar and hiba essential oils, menthol, extracts of yellowfins, extracts from citrus peel and seeds, aromatic sulfonamide derivatives, tricyclohexyltin hydroxide,
Isopropyl 4,4'-dibromobenzylate, 2,3-
Dihydro-2,2-dimethyl-7-benzo [b] furanyl-N-dibutylaminothio-N-methylcarbamate, a silane compound, a cinnamic acid derivative, cinnamyl acetate,
Bufofezin, isoprothiolane, paraoxybenzoate, iodinated formal, phenols, phthalate, 3-bromo-2,3-iodo-2-propenyl-ethylcarbonate, monoterpene ketones, monoterpene aldehydes, Monoterpene epoxides, benzyl salicylate, phenyl salicylate and the like can be mentioned.

Of these, dl · d-T80-aresulin, d-T80-flametrin, permethrin, tralomethrin, phenothrin, methoxadiazon, fipronil and imiprothrin are preferred. These insecticides may be contained in the aerosol stock solution at 0.05 to 30% by weight.

Compounds (synergists) that enhance the insecticidal efficacy of the insecticides include, for example, piperonyl butoxide, octachlorodipropyl ether, N- (2-ethylhexyl) -1-isopropyl-4- Methylbicyclo [2,2,2] oct-5-ene-2,3-dicarboximide, isobornyl thiocyanoacetate and N- (2-ethynyl) -bicyclo [2,2,1] -hepta-5 -Ene-2,3-dicarboximide and the like.

Various kinds of chemicals other than the above insecticides can be added. For example, pest repellents, bactericides, fungicides, deodorants, fragrances, coloring agents, and the like can be added. 2,3,4,5-bis (δ-butylene) as a pest repellent
-Tetrahydrofurfural, N, N-diethyl-m-
Toluamide, di-n-propyl isosine colomate, di-n-butyl acetic acid, 2-hydroxyethyl octyl sulfate, 2-t-butyl-4-hydroxyanisole, 3-
T-butyl-4-hydroxyanisole, cycloheximide, β-nitrostyrene cyanoacrylonitrile, tributyltin hydrochloride, trinitrobenzene-aniline complex, naphthalene, etc.
2,4,4'-trichloro-2'-hydroxydiphenyl ether, 2,3,5,6-tetrachloro-4-
(Methylsulfonyl) pyridine, alkylbenzylmethylammonium chloride, benzylmethyl- {2-
[2- (p-1,1,3,3-tetramethylbutylphenoxy) ethoxy] ethyl} ammonium chloride,
4-isopropyltropolone, N, N-dimethyl-N ′
-Phenyl-N '-(fluorodichloromethylthio) sulfonamide, 2- (4'-thiazolyl) benzimidazole, N- (fluorodichloromethylthio) -phthalimide, 6-acetoxy-2,4-dimethyl-m-dioxin, isopropyl Methylphenol, O-phenylphenol, p-chloro-m-xylenol and the like are used, lauric acid methacrylate and the like as deodorants, and rush essential oil components, hinoki essential oil components, citronella as fragrances. Lemon, lemongrass, orange, eucalyptus, lavender, etc. can be blended.

In the present invention, examples of the surfactant include sorbitan monooleate, sorbitan monolaurate, polyoxyethylene nonylphenyl ether, polyoxyethylene hydrogenated castor oil, decaglycerin monooleate and the like.

[0025] In a liquefied gas filled into aerosol cans together with the aerosol stock solution, for example, 2~5kg / cm ² in the metal container, preferably 4~5kg / cm ²
Pressure.

Further, the aerosol is applied to a full-aerosol type in which the entire amount is injected in a short time (for example, 10 to 120 seconds) in which gas leakage easily affects the ejection efficiency of the contents of the aerosol. Is preferred. If gas leakage occurs during storage in this full-aerosol, the gas pressure will be insufficient during use, causing a problem that the injection time will be long and that the entire content cannot be injected.

The aerosol can in the present invention includes, for example, metals such as aluminum and tin, plastics, resins,
A container molded from paper is exemplified, and the present invention is suitable for a metal container. The term “resin and / or rubber member” refers to a gasket, stem rubber, seal portion, or the like made of resin and / or rubber. Examples of the type of resin and / or rubber include polyethylene, polypropylene, polycarbonate, ABS resin, acrylic resin,
Examples include generally used rubbers and the like, and particularly, an acrylonitrile-butadiene copolymer (NBR) can exert a remarkable effect.

When the aerosol according to the present invention is used for controlling pests, the control target covers all kinds of pests living indoors and outdoors and indoor dust mites. Pests that live indoors and outdoors include sanitary pests and living pests. For example, as a sanitary pest, cockroaches (such as German cockroaches, black cockroaches, brown cockroaches, etc.), flies (such as house flies, blowflies, and sarcophagi), mosquitoes (such as houseflies,
Aedes, Shimaka, etc.), lice, fleas and the like,
Furthermore, as living pests, termites (feather ants), black ants,
Spiders, bees, pitworms, centipedes, gejigeji, millipedes, shibanmushi, arigatabachi, chironomid, butterfly fly, stink bug, bark beetle, dung beetle, balsam pear, spot, iga, koiga, katsuobushimushi, and kukaka are examples. Further, as indoor dust mites, mites that breed and proliferate indoors, or mites that enter the room, for example, Dermatophagoids such as Dermatophagoides farinae, Dermatophagoides farinae, Dermatophagoides farinae, Dermatophagoides farinae, Dermatophagoides farinae, etc. , Mites, house mites, dust mites, dust mites, sarcophagous mites, house mites, common ticks, mites,
Animal parasitic mites such as ticks.

[0029]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. The effect of the present invention was confirmed by the following gas leakage test. (1) Preparation of aerosol 2.25 g of an insecticide (permethrin) was dissolved in kerosene (neothiozole) to make 10 g, which was used as an aerosol stock solution. Next, an aluminum aerosol can equipped with a brass stem and a tin gasket (capacity: 280 ml)
20 g of each liquefied gas shown in Table 1 below,
g was filled under pressure (4.8 kg / cm ² , a pressure for sufficient injection) to prepare a full injection aerosol (samples 1 to 4).

(2) Confirmation of gas leakage The amount of gas leakage of each aerosol prepared as described above was calculated as 2
It was stored under 5 ° C. (room temperature) condition and measured by weight (change). The obtained value is shown in Table 1 as an annualized value (g) at room temperature.

[0031]

Table 1 Gas leakage amount Sample DME content (%) LPG content (%) Leakage amount (g) 140 60 1.03 2 20 80 0.20 3 80 20 3.694 100 0 36

(3) Results Samples 1 and 2 of the present invention had a small gas leakage amount, and the effect of preventing leakage was confirmed. In particular, there was almost no gas leakage in Sample 2, which is a preferred embodiment of the present invention.

[0033]

The method for preventing gas leakage of an aerosol according to the present invention has the effect of preventing gas leakage without performing any treatment on a member of an aerosol can or using a specific material and maintaining the basic performance as an aerosol. Can be obtained. In particular, an aerosol containing dimethyl ether and an aliphatic hydrocarbon, which is said to be likely to cause gas leakage, was able to achieve the gas leakage prevention effect for the first time. Further, the amount of gas leakage is significantly reduced as compared with the conventional aerosol, and the amount of leakage is prevented by about 1 g / year to 2 g / year.

Claims (2)

[Claims] In a method for preventing gas leakage of an aerosol in which dimethyl ether is filled as a liquefied gas in an aerosol can having a resin and / or rubber member,
While filling with an aliphatic hydrocarbon, the content of the dimethyl ether is adjusted to 40% by weight based on the total weight of the liquefied gas.
An aerosol gas leakage prevention method characterized by the following. 2. The method according to claim 1, wherein the aerosol is of a full injection type.