JPH0912404A - Moisture conditioning and insect control under floor - Google Patents

Abstract

PURPOSE: To condition the moisture under the flower of a building and to control insects continuously for a long period of time by supporting an insecticide on a specific granular or spherical silica gel and laying the insecticide under the flour of a building. CONSTITUTION: An insecticide is supported on a granular or spherical silica gel having 200-800m<2> /g specific surface area, 0.3-2ml/g pore volume, 5-30nm average pore diameter and 0.1-5mm average particle diameter and is laid under a floor. Chlorpyrifos, chlorpyrifos-methyl, diazinon, etc., are used as the insecticide. The amount of the insecticide supported is about 1-50g/kg based on the silica gel or preferably about 5-300g based on 1m<2> area under a floor. The amount of the insecticide supported is preferably about 1-100g/kg in the cases of chlorpyrifos-methyl. A method for impregnating the insecticide in a state of an aqueous solution or an emulsion into the silica gel by am immersion method or spraying is preferable as the method for supporting the insecticide on the silica gel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling humidity and insects under the floor of a building.

[0002]

2. Description of the Related Art There is a problem that moisture is easily accumulated under the floor of a house, and in that case, harmful insects such as termites and mites are generated. In order to prevent such problems,
It has been known to place a humidity control agent such as silica gel under the floor. However, it was not easy to maintain the effect for a long period of time.

[0003]

DISCLOSURE OF THE INVENTION The present invention aims at controlling humidity and controlling insects in a building continuously over a long period of time.

[0004]

The present invention has a specific surface area of 2
00-800 m ² / g, pore volume 0.3-2 ml /
g, average pore diameter is 5 to 30 nm, average particle diameter is 0.1
Provided is an underfloor controlled humidity insect control method in which a 5 mm granular or spherical silica gel is loaded with an insect repellent and the silica gel is placed under the floor of a building.

In the present invention, the term "underfloor" generally refers to the lower part of the floor of a building. Especially under the floor on the first floor, the humidity tends to be high, so the effect is high. It is also effective for wooden houses, but it is also effective for concrete buildings.

[0006] Silica gel, when the pore characteristics were measured by the nitrogen adsorption-desorption method, a specific surface area of 200~800m ² /
g, pore volume 0.3-2 ml / g, average pore diameter 5
It is necessary to be ˜30 nm.

In order to have a humidity control action, it is necessary to have an ability to adsorb water when the humidity is high and to release the water when the humidity is low. Insecticide-supported silica gel dried under reduced pressure with a rotary pump to a temperature of 25 ° C and a relative humidity of 80%.
After keeping it for 8 hours, it becomes 48% in relative humidity.
It is preferable that the amount of water released when kept for a period of time is 10% by weight or more, and particularly 15% by weight or more based on silica gel. On the contrary, the silica gel with insect repellent dried under reduced pressure with a rotary pump was placed at 25 ° C and a relative humidity of 40%.
After keeping it for 8 hours, it becomes 48% in relative humidity.
The amount of water adsorbed when kept for a period of time is preferably 10% by weight or more, and particularly preferably 15% by weight or more, based on silica gel. Further, it is desirable that this property does not change even if it is repeated many times.

The silica gel preferably has a granular or spherical shape having an average particle diameter of 0.1 to 5 mm on a weight basis.

The amount of silica gel sprayed is preferably in the range of 1 to ¹⁰ kg per 1 m ² under the floor. Spray rate is 1 kg / m ²
If it is less than the above range, the effect of the present invention may not be exhibited, which is not preferable. If the spray amount exceeds 10 kg / m ² , a large amount of silica gel will be used, which is economically disadvantageous.

The insect repellents to be carried on silica gel include various insects and other harmful insects such as termites, ants, cockroaches, mites and slugs. Specifically, as an insect repellent, chlorpyrifos, chlorpyrifosmethyl,
Diazinon, pyridafenthion, fenitrothion, etc. are effective. These insect repellents can be used alone or in admixture of two or more.

The amount of the insect repellent carried depends on the kind of the insect repellent, but when the insect repellent is chlorpyrifos, it is preferably about 1 to 50 g / kg of silica gel. Alternatively, it is preferably about 5 to 300 g per 1 m ² under the floor in a sprinkled state. In the case of chlorpyrifosmethyl, the amount is preferably about 1 to 100 g / kg with respect to silica gel. In the case of diazinon, it is preferably about 1 to 50 g / kg with respect to silica gel. In the case of pyridafenthion, the amount is preferably about 1 to 100 g / kg with respect to silica gel. In the case of fenitrothion, it is preferably about 1 to 100 g / kg with respect to silica gel.

The method for supporting the insect repellent is preferably a method of impregnating the insect repellent with an aqueous solution or emulsion of the insect repellent by an immersion method or a spraying method and then drying. The insect repellent may be impregnated in the silica gel after being installed by means such as spraying silica gel under the floor, but silica gel impregnated with the insect repellent in advance may be installed under the floor.

As a construction method, it is effective even if it is installed under the floor as it is, but if necessary, it may be installed on a waterproof sheet or granular sepiolite, attapulgite or zeolite. Such a method may be adopted.

[0014]

【Example】

[Example 1] Specific surface area of 501 m ² / g, pore volume of 0.913
It has a pore structure of ml / g and an average pore diameter of 7.3 nm (measured by the nitrogen adsorption / desorption method), and has an average particle diameter of 3 mm and a particle diameter distribution substantially in the range of 1.7 to 4.0 mm. To 100 g of spherical silica gel, 50 ml of a 40-fold diluted chlorpyrifos emulsion (active ingredient 1%) was uniformly sprayed and air-dried for 12 hours. Further, it was dehydrated under reduced pressure with a vacuum pump at room temperature for 8 hours.

Example 2 A specific surface area of 465 m ² / g, a pore volume of 0.882 ml / g, an average pore diameter of 7.6 nm (measured by nitrogen adsorption / desorption method), and an average particle diameter of 3 m.
50 ml of fenitrothion capsule emulsion 12.5 times dilution (active ingredient 1.6%) to 100 g of spherical silica gel having a particle size distribution substantially in the range of 1.7 to 4.0 mm.
Was evenly sprayed and air dried for 12 hours. Furthermore, at room temperature, 8
It was dehydrated under reduced pressure with a vacuum pump for an hour.

Example 3 A specific surface area of 249 m ² / g, a pore volume of 1.58 ml / g, an average pore diameter of 25.4 nm (measured by the nitrogen adsorption / desorption method), and an average particle diameter of 3 m
50 ml of a 40-fold diluted chlorpyrifos solution (active ingredient 1%) was uniformly sprayed on 100 g of spherical silica gel having a particle size distribution of m in the range of 1.7 to 4.0 mm and dried in air for 12 hours. Further, it was dehydrated under reduced pressure with a vacuum pump at room temperature for 8 hours.

[Example 4 (Comparative Example)] Specific surface area 750 m ² /
g, pore volume 0.47 ml / g, average pore diameter 2.5 n
Chlorpyrifos 40-fold dilution liquid was added to 100 g of spherical silica gel having a pore structure of m (measured by nitrogen adsorption / desorption method) and having an average particle size of 3 mm and a particle size distribution substantially in the range of 1.7 to 4.0 mm. 50 ml (1% of active ingredient) was evenly sprayed and air dried for 12 hours. Further, it was dehydrated under reduced pressure with a vacuum pump at room temperature for 8 hours.

[Moisture Adsorption Rate] 5 g of the silica gel carrying the insect repellent of Examples 1 to 4 was used at a temperature of 25 ° C. and a relative humidity of 2 respectively.
The sample was left in an atmosphere of 0%, 40% and 80% for 48 hours, and the water adsorption rate of the sample was measured according to JIS Z0701. The reference weight for calculating the water adsorption rate is the weight after the dehydration under reduced pressure by the vacuum pump for 8 hours. Table 1 shows the results. All the units of numerical values in Table 1 are% by weight.

[Humidity (breathing) performance] In the above moisture adsorption rate test, a sample kept at a relative humidity of 40% for 48 hours was transferred to a condition of a relative humidity of 80% and kept for 48 hours to measure the water adsorption rate. did. Further, in the above moisture adsorption rate test, a sample kept at a relative humidity of 80% for 48 hours was transferred to a condition of a relative humidity of 40% and kept for 48 hours to measure the moisture adsorption rate. Table 1 shows the moisture adsorption rate and the moisture adsorption amount and desorption amount. In Example 4, the humidity control performance is low when the humidity is changed from a high humidity state to a low humidity state.

[0020]

[Table 1]

[Repeated Moisture Absorption / Desorption Test] The silica gels of Examples 1 and 4 were repeatedly subjected to a water adsorption / desorption test. 2 at 25 ° C and 80% relative humidity when adsorbing water
0 hours, no air flow, 16-18 ° C when desorbing water,
The sample was exposed to a condition with an air flow for 4 hours at a relative humidity of 30 to 45%. The water adsorption rates were measured after the first, tenth, and thirtieth adsorption and after desorption, and their widths were compared. Table 2 shows the results. All the units of numerical values in Table 2 are% by weight. The silica gel of Example 1 can absorb and desorb a large amount of water even when the number of repetitions is increased, whereas the silica gel of Example 4 is inferior in this performance.

[0022]

[Table 2]

[Insect repellent test] 3 with a diameter of 6 cm and a height of 1 cm
10 g of the silica gel of Example 1, the same silica gel as in Example 1 except that the insect repellent was not loaded, or general soil was placed in each of the two glass containers.
The mortality was calculated 24 hours and 48 hours after 0 animals were released. In the container containing the silica gel of Example 1, all termites died in 24 hours. All the termites survived in the soiled container even after 48 hours. All of the samples loaded with unsupported silica gel died after 48 hours, but after 24 hours, the mortality was 40%, which was less effective than that of Example 1.

Example 5 A specific surface area of 465 m ² / g, a pore volume of 0.882 ml / g, an average pore diameter of 7.6 nm (measured by nitrogen adsorption / desorption method), and an average particle diameter of 3 m.
50 g of spherical silica gel whose particle size distribution is substantially in the range of 1.7 to 4.0 mm at the soil surface (0.0125 m
² ), 25 ml of a 40-fold diluted chlorpyrifos emulsion (active ingredient 1%) was evenly sprayed on it, and kept in the dark at 40 ° C. After spraying, 1 month, 6 months, 12
After 10 months and 24 months, 10 termites were peeled off, and the mortality rate after 24 hours was 100% in each case. On the other hand, for comparison, a 40-fold diluted chlorpyrifos emulsion (1% active ingredient) was added to the soil.
When 25 ml was sprayed and tested in the same manner, 6 months later, 6
Mortality rates after 1 month, 12 months and 24 months are 1
The results were 00%, 80%, 10% and 0%, and it was found that there was no lasting effect.

[0025]

According to the present invention, the humidity under the floor of a building can be adjusted and dew condensation can be prevented. In addition, it is possible to control insects continuously for a long period of time.

Claims (1)

[Claims] 1. A specific surface area of 200 to 800 m ² / g, a pore volume of 0.3 to ² ml / g, and an average pore diameter of 5 to 30 n.
m, an underfloor-conditioning insect repellent method in which a granular or spherical silica gel having an average particle diameter of 0.1 to 5 mm is loaded with an insect repellent and the silica gel is placed under the floor of a building.