JPH02234626A - Method for killing mites, tool therefor and container for materials to undertake acaricidal treatment - Google Patents

Abstract

PURPOSE:To remove discomfort by placing an oxygen-absorbing agent and a material to be treated for killing mites in a specific container and lowering the oxygen concentration to kill out the mites. CONSTITUTION:An air oxygen-absorbing agent which is generally used in a one-way type body warmer and the material to be treated for killing mites therein, when needed, a desiccant, a volatile fungicide or the like are placed in a container of less than 8,000cc/m<2>/24hr/atm to give a mite-killing tool. The inside of the container is kept less than about 3% oxygen content to eradicate the mite in the material.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a mite killing method and a mite killing device characterized in that mites living in bedding etc. are killed by low oxygen concentration. The present invention also relates to a storage body for a mite-killing material.

<Conventional technology> Mites that live in ordinary homes are found in bedding, pillows,
Typical examples are dust mites, which are found in stuffed toys, carpets, curtains, etc., and mites, which are found in tatami mats, flour, food, etc.

The dust mite family includes the dust mites, the dust mites, and the like, and is considered to be one of the causes of allergic diseases. Also, the Acaridae family includes the Acaridae mite, which, although not directly harmful to humans, causes discomfort.

When the above-mentioned mites are present, one conventional method of controlling them is to expose them to direct sunlight, but this method is not very effective and cannot reliably kill the mites.

Furthermore, in recent years, chemical substances have been developed and mite control agents have been proposed, but the main control agents have been those using virethroids or organic phosphorus-based chemicals.

<Problem to be solved by the invention> However, the use of the above-mentioned chemical substances has a negative effect on the human body, even if small, and in particular may cause unpleasant odors to be emitted from bedding or food, etc. It gave me a sense of pleasure.

Means for Solving the Problems》 The present invention was proposed in view of the above, and uses an oxygen absorbent that absorbs oxygen in the atmosphere and a mite-killing material with an oxygen gas permeability of 8000cc/m2/24hr. /atm or less, and the inside of the container is made into an atmosphere with an oxygen concentration of about 3% or less to kill the mites living in the mite-treated material. The present invention relates to a mite-killing method, a mite-killing device for carrying out the mite-killing method, and a container for a mite-treated material used in the mite-killing method.

The oxygen absorbent used in the acaricidal method, device, etc. of the present invention may be of any type as long as it can appropriately absorb oxygen present in the atmosphere. things can be used.

First composition.

(a) One or more compounds selected from powdered, granular, etc. metals (preferably iron) that have a greater ionization tendency than hydrogen; (b) A chloride of a metal that has a greater ionization tendency than the metal a. or one or more compounds selected from sulfates (preferably alkali or alkali metals); (C) one compound selected from metal oxides (preferably oxides of copper, manganese, etc.); (d) a water-soluble organic acid (such as chloroacetic acid) or a water-soluble organic base compound inorganic salt (hydrochloric acid or sulfuric acid hydroxylamine or methylamine hydrochloride, hydrochloric acid or hydrazine sulfate);
A mixture of four groups of a, b, c, and d consisting of more than one compound, or a compound of three groups excluding one group of b, c, and d from this mixture.
A composition that reacts with water and oxygen to generate heat and absorbs oxygen.

Second composition.

(a) one or more compounds selected from birosulfites, sulfites, and hydrogen salts of alkali metals or alkaline earth metals or ammonium; (b) salts of transition metals and salts of aluminum; (c) one or more compounds selected from a poorly water-soluble solid and free water, free water, or a compound containing an alkaline earth metal and exhibiting alkalinity; Absorbing Composition 6 Third Composition.

(a) One or more compounds selected from iron carbide, iron carbonyl, ferrous oxide, ferrous hydroxide, and iron silicon; (b) One or more compounds selected from metal halides, metal halides, and water. A composition that absorbs oxygen with a mixture of two groups of compounds.

As the oxygen absorbent mentioned above, for example, a commonly used disposable body warmer can be used.

On the other hand, the container for storing the mite-killing material has an oxygen gas permeability of 8000 cc/m2/24 hr/atm or less, and its materials include low-density polyethylene, high-density polyethylene, polypropylene, polyester, nylon, polyester, etc. Examples of vinyl chloride, polyvinylidene chloride, polystyrene, polyamide, and laminate films include cellophane/polyethylene, nylon/polyethylene, polyester/polyethylene, unstretched polypropylene/stretched polypropylene, and stretched polypropylene/polyethylene. In addition, the opening of the storage body can be sealed using heat sealing, which has a high airtightness, using special equipment, or using clips, strings, rubber, etc., which are less airtight, or by using an uneven chuck at the opening. It is possible.

Among the materials for the storage body mentioned above, oxygen gas impermeable films such as polyvinylidene chloride coated films and aluminum laminate 1 films, which have excellent airtightness, or semi-oxygen gas impermeable films (oxygen gas permeability 0 = ] .Occ
/m2/24hr/atm), but these materials are relatively expensive and are not economically suitable.

Therefore, the material of the above-mentioned storage body may be a bag made of polyethylene or polypropylene, which is a general-purpose inexpensive product, considering economic efficiency, and the opening of the storage body may be sealed by simply tying the opening. It is enough to tie it with string etc.

The volume of the storage body is determined by the size of the mite treated material, but if bedding, pillows, stuffed animals, curtains, etc. are used as the mite treated material, the volume is 1m.
X 1mX lm or less is desirable.

By storing the above-mentioned oxygen absorbent and mite-killing material in a storage body configured as described above, the oxygen concentration inside the storage body, which is normally 20%, can be reduced to about 3%.
By creating an atmosphere with the following low oxygen concentration, it is possible to actively kill the mites living in the material to be treated with mites.

By the way, the growth and reproduction of mites has the following characteristics with respect to temperature and humidity.

Dust mites generally proliferate and develop within a temperature range of 10 to 32°C, but grow from an egg to an adult within two months at a temperature of 20 to 32°C.

The atmospheric humidity in which the moisture entering and exiting the body of the mite is equal to the amount of moisture entering and exiting from the outside air is called critical equilibrium humidity, and is an important factor in the living conditions of the mite. It has been reported that the critical equilibrium humidity of the Dermatophagoides leopardis mite is 70% relative humidity, and the critical equilibrium humidity of the Dermatophagoides leopardis mite is 74% relative humidity.

The preferred growth conditions for Dermatophagoides mites are a temperature of 25° C. and a relative humidity of 80%. Therefore, the atmosphere in Tokyo is
For several months, conditions are completely suitable for mites. Furthermore, as long as humans live in a residential environment, the indoor temperature is often always within the suitable growth temperature for dust mites due to air conditioning. In addition, there are many humidity conditions suitable for the growth of dust mites in the human living environment, especially near the floors, walls, and inside closets, where relative humidity is often higher than that of the atmosphere. In residential environments, conditions are considered to be favorable for ticks at least from May to October.

The conditions for the growth of mites are an indoor environment of 10 to 40°C and a relative humidity of 60% or more, and it is desirable to carry out the acaricidal treatment during the above-mentioned active period of the mites.

Further, in the mite killing method of the present invention, a desiccant, a volatile fungicide, a fragrance, or the like may be placed inside the container together with an oxygen absorber.

The desiccant mentioned above includes calcium chloride, silica gel, quicklime, etc., which dry the bedding and make it comfortable to use, and also prevent the growth of surviving mites due to the decrease in humidity.
It also has the effect of inhibiting the growth of mold.

In addition, volatile anti-mold agents include barraclo-meth-xylenol, dichloro-meth-xylenol, and thymol, which can suppress the growth of mold, and fragrances provide a pleasant feeling of use after mite killing treatment. It is possible to give the effect of making it more effective.

<Example> Examples of the acaricidal method of the present invention are shown below.

Test insects: Woolly mites, Dermatophagoides mites Test method: The mites and culture medium were supplied to four vials each, and the inlets were closed with air-permeable wrap. On the other hand, a box-shaped container (45 x 37 x 2
Place a cotton futon in a 4cm (approximately 40℃)
Two vials of each sample insect were placed in four locations: between the futons, on the side of the futon, and on the top of the futon. Then, I placed four disposable warmers on top of the futon and closed the lid. The mites were placed in a low-density polyethylene bag, the mouth of the bag was closed, and the mites were left in a constant temperature room at 25°C, and the survival or death of the mites was observed every certain number of days. The results are shown in Table 1 below.

In addition, the oxygen concentration inside the bag was measured every certain number of days. The results are shown in Figure 1.

The disposable warmers and low-density polyethylene bags used in the above examples are as follows.

Disposable body warmer: Product name Hocalon, manufactured by Japan Pionics Co., Ltd. Low-density polyethylene bag: Thickness 40 μm, oxygen gas permeability 6000 to 8000 cc/m2/24 hr/at
mTable 1 As is clear from Table 1 above, the woolly mite is 2
After 8 days, it was confirmed that the mites had died.

When the inhabitation of mites in the futon was confirmed two months later, no growth of mites was observed, and it was confirmed that all the adult mites, larvae, and eggs had died.

Furthermore, when the above procedure was performed without inserting a disposable body warmer, woolly mites were still alive two days later.

Furthermore, in the above procedure, when we placed woolly mites and a disposable warmer on top of the futon without placing them in a low-density polyethylene bag, the heat generating ability (oxygen absorption ability) of the disposable warmer disappeared after one day, and the woolly mites and disposable body warmer disappeared after one day. was alive.

From the above results, it was confirmed that the woolly mites did not die due to high temperature (33° C.) or their own oxygen consumption, but due to oxygen deficiency caused by the oxygen absorber.

The figure shows the change in oxygen concentration inside the futon over 30 days of the above experiment.

Effects of the Invention> As explained above, according to the mite killing method of the present invention, by simply placing an oxygen absorber inside the container, a huge amount of mites living in bedding such as futons or food can be killed. can be easily killed.

In addition, the mite killing method of the present invention is extremely easy to operate and superior in safety compared to conventional methods using chemicals.Furthermore, the container used is a regular bag, and the oxygen absorber is a general-purpose disposable bag. Since it can be made into a hand warmer, the raw materials are easily available and it can be easily carried out at ordinary households.
This is a method of extremely high practical value.

[Brief explanation of the drawing]

FIG. 1 is a graph showing changes in oxygen concentration in Examples of the present invention. Patent applicant: ST Chemical Co., Ltd. Agent: Takeru Fukuda, patent attorney

Claims (3)

[Claims] (1) Use an oxygen absorbent that absorbs oxygen in the atmosphere and a mite-killing material with an oxygen gas permeability of 8000cc/m^2/24.
hr/atm or less, and the inside of the container is made into an atmosphere with an oxygen concentration of about 3% or less to kill the mites present in the mite-treated material. Mite killing method. (2) Consists of an oxygen absorbent that absorbs oxygen from the atmosphere and a storage body with an oxygen gas permeability of 8000cc/m^2/24hr/atm or less, and the oxygen absorbent and the mites to be killed are placed inside the storage body. A mite killing device that kills mites existing in the mite-killed material by creating an atmosphere with an oxygen concentration of about 3% or less inside the storage body when the mite-treated material is stored. (3) Oxygen gas permeability is 8000cc/m^2/24h
r/atm or less, and when an oxygen absorbing material that absorbs atmospheric oxygen and a mite-killing material are housed inside, the mite-killing treatment is performed by creating an atmosphere with an oxygen concentration of about 3% or less inside. A container for mite-treated materials designed to kill mites present in the material.