JPH0374488A - Aerosol product capable of whole quantity spray - Google Patents

Abstract

PURPOSE:To obtain the subject product having an improved spraying property without using CFC by using a propellant composed of a combustible liquefied gas, etc., and preparing the subject product so as to be capable of spraying the whole amount in an enclosed space without exceeding the concentration limit required to forbid the use of open flame. CONSTITUTION:(A) An active component, (B) a combustible solvent and (C) a composition composed of (i) a propellant consisting of a combustible liquefied gas composed of dimethyl ether, etc., or consisting of a mixture gas composed of the above-mentioned gas and a compressed gas and/or (ii) an atomizing agent prepared by using a volatile silicone and/or an univalent alcohol are charged into an aerosol-use sprayer-attached pressure vessel while controlling the content of the combustible propellant in the composition so as not to exceed the concentration limit required to forbid the use of open fire even when spraying the whole amount of the composition in an enclosed space, thus preparing the objective aerosol product.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to aerosol products.

For more details, spray one can of an aerosol product in a 6-tatami room in a typical household, or spray one can of an aerosol product to deodorize the interior of a car. deodorizing air fresheners, and insecticides for ticks that are used by injecting aerosol contents into several places on one tatami mat to exterminate the mites that live inside the tatami mats at home. As the aerosol contents are injected into one spot per tatami mat for 3 to 5 seconds and the aerosol contents are injected into several spots using a button with a needle, the result is that almost the entire amount of one can of aerosol product is sprayed into the room in a short period of time.) Aerosol products such as fumigation insecticides used to exterminate pests in greenhouses, insecticides and disinfectants used in warehouses, dining rooms, ship cabins, hospital rooms, etc. within a short period of time. This invention relates to an aerosol product that is used by spraying almost the entire amount from a can.

By appropriately selecting the active ingredients, the aerosol product of the present invention can be used in the same ways as conventional products, such as insecticides, disinfectants, deodorizing fragrances, etc. However, in particular, the aerosol product can be sprayed in its entirety into a sealed space. It is advantageously used when processing.

[Conventional technology]

A undiluted solution of active ingredients dissolved in a flammable solvent and a propellant of flammable liquefied gas are stored in an aerosol pressure-resistant container (hereinafter referred to as a container).
A container is filled with aerosol products and active ingredients of insecticides dissolved in a solvent, and a propellant of Freon gas, which is a non-flammable liquefied gas, is filled into a container and an injection device is attached. Aerosol products are widely used in the fields of insecticides, fungicides, deodorizers, etc., as is well known, by making an aerosol product and spraying the entire amount into a space for treatment.

For example, in the case of insecticides targeting flies and insects, a stock solution of the active ingredient dissolved in a flammable solvent <40 to 50 VolX)
and the flammable gas dimethyl ether (hereinafter referred to as DME)
and liquefied petroleum gas (hereinafter referred to as LPG) alone or a mixed composition propellant (50 to 60 Vol) is filled into a container,
Various products equipped with injection devices are commercially available.

This type of insecticide is used inside a sealed house, and there are many products with a total capacity of 300 to 450 m per can. (1 to 2 g) is enough to achieve the purpose, so even if a large amount of flammable solvent and heat gas is used, the amount of each injection is small, so even if there is a fire source, the flammable components will burn and explode inside the house. There is almost no risk of doing so.

In the case of fumigant-like insecticides, a small amount of the active ingredient dissolved in the stock solution (5 to 10 Volχ) and a large amount of propellant (90 to 95 Volx) are used.
There are commercially available products in which a container is filled with (VolK) and an injection device is attached.

This type of insecticide has a total capacity of 100 to 150-
Many products are designed to spray the entire amount in a closed room in a short period of time, atomize the undiluted solution with the power of a large amount of liquefied gas, and spread the active ingredient particles to every corner of the room. Since nonflammable Freon gas is used as the liquefied gas, there is no risk of combustion or explosion even if the entire amount is injected in a short period of time inside a house with a fire source.

However, it has been pointed out that Freon gas causes global pollution by destroying the ozone layer in the stratosphere, and there is an urgent need to develop alternatives.

In the case of insecticides for mites that live inside tatami mats, a relatively large amount of undiluted solution (50-70Vo1%) is used, and a propellant (30-5Vo1%) is used.
Freon gas and combustible gas (0 Vo I %)
A mixed gas of DME, LPG, etc. is used, but the ratio of Freon gas to combustible gas (W/W) is (9:1).
~ (8: 2), and the amount of flammable gas used is extremely small, so even if almost the entire amount of one can is used in a closed house within a short period of time, there is almost no risk of combustion or explosion. There's nothing.

However, since it is not preferable to use a large amount of Freon gas as mentioned above, there is also an urgent need to develop a substitute for this gas.

It is widely known that a method for atomizing the mist sprayed by an aerosol product is to use as much liquefied gas as possible.

Additionally, the pressure inside the container of conventional aerosol products is usually 25°C.
It is also known that it is 3 to 4 kg/c-d.

[Problem to be solved by the invention]

The present invention is an aerosol product for treating a closed space by injecting almost the entire amount in a short period of time, and although the propellant has been changed from conventional Freon gas to flammable gas, there is no risk of explosion. The aim is to provide an aerosol product with a new composition that is almost unique.

A large amount of the previously commercially available Freon gas (90~
Similar to fumigation insecticides with a capacity of 100 to 15 (ld), aerosol products that can spray almost the entire amount and spread fine particles of the active ingredient to every corner of a closed space are simply Freon gas in the conventional product composition. However, since products containing such a large amount of flammable gas may expose users to the risk of explosion, it is possible to produce products by replacing them with the same amount of flammable gas. There was a need to improve the formulation so that a finely divided aerosol could be delivered with a gaseous propellant.

Therefore, the present inventors investigated various formulation conditions such as the solvent, propellant, atomizing agent, and internal pressure of the container when producing an aerosol product.

[Means to solve the problem]

The total injection type aerosol product of the present invention is an aerosol product for treating a closed space by spraying almost the entire amount in a short period of time, and comprises an active ingredient, a flammable solvent, a propellant, and/or an atomizing agent. In an aerosol product obtained by filling a pressure-resistant container with an aerosol injection device with a composition consisting of: (1) the propellant is a flammable liquefied gas or a combination of a combustible liquefied gas and a compressed gas; The composition is characterized in that the content of the flammable propellant in the composition is such that when the entire amount of the composition is injected into the closed space, the concentration is equal to or lower than the concentration prohibiting use of an open flame.

In the present invention, the active ingredients can be appropriately selected and used depending on the purpose of treating a closed space, such as a room in a general household.

Warehouse 1 Dining room, ship's cabin, hospital room, train/automobile interior.

Active ingredients used in known insecticides, fungicides, deodorants, fragrances, etc. can be used to suit the purpose of treating limited spaces such as greenhouses.

As the soluble solvent, any solvent can be used as long as it dissolves the active ingredient and has low toxicity, but especially when the active ingredient is sufficiently dissolved in the propellant or atomizing agent, they will play the role of a solvent. There is no need to use another solvent.

As a propellant, a combustible liquefied gas is used, or a combination of a combustible liquefied gas and a compressed gas is used.

As the combustible liquefied gas, for example, LPG, DME, difluoromonochloroethane, etc. can be used, and as the compressed gas, for example, CO□Nl+N, 0, etc. can be used.

As the atomizing agent, isopropyl alcohol (hereinafter referred to as IP
A), a monohydric alcohol such as modified ethyl alcohol, and a surfactant such as a volatile silicone having a cyclic polydimethylsiloxane structure can be used alone or in combination.

Products that use kerosene as a solvent for fumigant-like insecticides are
Compared to conventional products, the contents are made up of a smaller amount of stock solution and a smaller amount of propellant, so the concentration of active ingredients in each can is higher, and it may not be possible to sufficiently atomize the spray particles with just a small amount of liquefied gas. be.

In such cases, use compressed gas to reduce the pressure inside the container to 4~
By reinforcing the product to 7.5 kg/cm2 (at 25°C) and/or mixing an atomizing agent, it is possible to atomize the spray particles with a smaller amount of propellant compared to conventional products, and also improve the diffusion of the spray particles. We were also able to bring it into very good condition.

The prohibited concentration for the use of an open flame as referred to in the present invention indicates the lower explosive limit of 176 for the flammable propellant used, and the volume of the closed space shall be such that flammable gas is uniformly dispersed at a height of up to 30 C1l above the floor. The liquid liquefied gas lMo1 is 24.
Calculations can be made assuming that the amount of gas is 45f. Many ordinary homes are equipped with gas leak alarms, and the alarm concentration is set to 1/4 of the lower explosive limit in places where it is difficult to set the alarm concentration.
It is. Therefore, even if the entire can of the fumigant-like insecticide aerosol product using flammable gas of the present invention is injected, the flammable gas concentration is below the alarm concentration, and the aerosol product is safe without setting off the gas leak alarm. You can say that.

In addition, kerosene is used as the solvent for the stock solution, and LP is used as the propellant.
Aerosol products using G have the disadvantage that the inner surface of the tin container may corrode if a small amount of water gets into the container, and the product life is short. It was discovered that aerosol products that use DME as a propellant do not cause corrosion of the inner surface of the tin container even when a small amount of water is mixed in, and that DME exhibits an excellent rust prevention effect.By using DME as a propellant, the above We were able to eliminate the shortcomings.

In the present invention, "spraying almost the entire amount in a short period of time" means spraying the entire amount of one can in one spray, such as when killing or sterilizing insects in a room in a general household, a greenhouse, etc., or deodorizing the inside of a car. In addition to cases in which spraying is repeated one after another in order to eliminate dust mites living inside the tatami mats in a household room, almost the entire amount of one can can be sprayed within a relatively short period of time. It also includes.

In order to specifically explain the embodiments of the present invention, examples will be shown below in which permethrin, which is an active ingredient used in insecticides, is used, but the present invention is not limited only by the examples.

Example 1 Active ingredient Permethrin 2.3g Solvent 22.9g (331) The above ingredients are filled into an aerosol pressure-resistant container with a full injection volume of 148 d, an injection device is attached, and a full-volume injection type aerosol insecticide is obtained. This preparation has a pressure of 6.0 kg/cm2 in a container at 25°C, and can safely and effectively exterminate indoor mites, cockroaches, etc. by spraying the entire amount in a 6-tatami room in a typical home in a sealed room. I was able to do it. The concentration of DME is 0.36% when it is uniformly diffused in a space up to 1 m above the floor, which is sufficiently smaller than the 0.58% concentration that prohibits the use of open flames.

Example 2 Active ingredient: Permethrin 2.3g Solvent: Kerosene 129.1g The above ingredients are filled into a container with a full capacity of 395II11, an injection device is attached, and an aerosol insecticide for mites living inside tatami mats is obtained.

This preparation has a pressure of 6.5 kg/cl in a container at 25°C.
By injecting the contents into the tatami mats of a 6-tatami room in a typical household using a needle-shaped spray device, and also spraying on the surface of the tatami mats, it was possible to exterminate dust mites and the like inside the room. DM above
The concentration of H was calculated in the same manner as in Example 1 and was 0.55%, which is a safe concentration.

Example 3 Active ingredient Permethrin 2.3g Solvent The above ingredients are filled into a container with a full injection amount of 148ad, an injection device is attached, and a full injection type aerosol insecticide is obtained. is 6.0kg/
cm2, and by sealing a room in a general household and spraying the entire amount, indoor dust mites can be removed using fumigation.

I was able to get rid of cockroaches, etc. When the amount of DME is calculated in the same manner as in Example 1, it is 0.46%.

〔Effect of the invention〕

According to the present invention, the amount of propellant used in aerosol formulations is significantly reduced, and as a result, various troubles caused by propellants are significantly reduced, and almost the entire amount is sprayed in a short period of time to fumigate a closed space. It has now become possible to manufacture safe full-volume aerosol products for processing.

In order to specifically explain the effects of the present invention, a test example will be presented below regarding the effect of using or not using an atomizing agent on the atomization (diffusivity) of sprayed particles of an aerosol product when the amount of propellant used is reduced. show.

Test example: Comparative products below 1. Comparative product 2 and comparative product 3 were prepared and compared with the product of the present invention (Example 1) in terms of atomization of the sprayed particles.

Comparison product 1 (Product with the same formulation as a commercially available product that uses a large amount of fluorocarbons) Active ingredient: Permethrin 2.25g Solvent: Kerosene 3.35g Comparison product 2 (Using a combination of fluorocarbons and flammable liquefied gas as propellants, reducing the amount used) Active ingredient Permethrin 2.50g Solvent 101.0g (100d) Comparison product 3 (Flammable liquefied gas is used as the propellant, kerosene is used as the solvent, and CFCs are A product that does not use a pulverizer, but reinforces the internal pressure of the container with N! gas to 5.0 kg/cm2, and does not use a pulverizing agent) Active ingredient Permethrin 2.3 g Solvent Kerosene 5.0 g 27.5 g
(39m) A comparison of the atomization state of sprayed particles between the product of the present invention and the comparison product shows air pollution (corrosion containing fluorocarbons is marked as ×, and those that do not contain fluorocarbons are marked as ○), neighborhood pollution (cells near the injection site are marked as (whether the product is contaminated with the undiluted solution or not), diffusivity (when an aerosol product is sprayed in the center of a 6-tatami room, particles are collected at several points in the room using a surface-treated pellet and the size of the particles is measured using a microscope.

Items containing 1% or less of coarse particles with a diameter of 30μ to 50μ are classified as 0.
．． A product containing 1 to 10% or more of coarse particles of 30μ to 50μ is Δ, a product containing 10% or more of 30μ to 50μ coarse particles is ×.Product life (45°0°6 months storage 0.6 if there are no abnormalities in the test after 6 months
A case where rust occurs on the inner surface of the can in the 6th month is Δ, and a case where rust reaches the perforation line in the 6th month is a x) and safety (the gas concentration of flammable gas does not reach the open flame prohibited concentration) Mark as ○,
The concentration from O to the alarm activation is Δ, and the concentration higher than the alarm activation is X), and the evaluation is O (good), Δ (slightly poor), and ×
It was conducted in three stages: (problems).

The results of this test are shown in Table 1.

As is clear from the results in Table 1, the product of the present invention sprayed excellent fine aerosol equivalent to Comparative Product 1, which used a large amount of fluorocarbon.

The results of Comparative Product 2 show that even if Freon is used in combination to reduce the amount of flammable gas used, if the overall amount of propellant used is reduced, the diffusivity is clearly inferior.

The results of Comparative Product 3 indicate that a good atomized aerosol cannot be obtained even if flammable liquefied gas is used as a propellant and solvent and the injection pressure is reinforced with compressed gas.

As described above, the present invention does not use fluorocarbons,
The present invention provides a full-volume injection type aerosol product with excellent scattering properties equivalent to or better than products using conventional fluorocarbons.

Claims (1)

[Claims] 1. An aerosol product for treating a closed space by spraying almost the entire amount in a short period of time, which comprises an active ingredient, a flammable solvent,
In an aerosol product prepared by filling a pressure-resistant container with an aerosol injection device with a composition consisting of a propellant and/or an atomizing agent, (1) the propellant is a flammable liquefied gas or a combustible liquefied gas; It uses a combination of liquefied gas and compressed gas, and (2) the content of flammable propellant in the composition is such that when the entire amount of the composition is injected into the closed space, the concentration is below the concentration prohibited for use with open flames. A full-volume aerosol product characterized by: 2. The aerosol product according to claim 1, characterized in that dimethyl ether is used as the flammable liquefied gas. 3. The aerosol product according to claim 1 or 2, characterized in that volatile silicon and/or monohydric alcohol are used as the atomizing agent. 4. The internal pressure inside the container at 25℃ is 4 to 7.5 kg/c.
4. The aerosol product according to claim 1, 2 or 3, wherein the aerosol product is adjusted with a compressed gas so that the amount of the aerosol product is m^2.