JPH0742799B2 - Insect tatami mat - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insect-proof tatami mat which can exhibit a stable mites-preventing effect for a long period of time.

[0002]

2. Description of the Related Art In a house having a closed building structure such as a condominium, tatami mats do not breathe and tend to become damp. For this reason, it has been studied to provide tatami mats with an anti-tick effect. However, conventional insect-proof tatami mats are organic phosphorus-based, pyrethroid-based, carbamate-based, or diazinon-based organic chemicals that are sprayed or adhered to the tatami floor or tatami mat. . Further, these organic agents are liable to lose their mites-preventing effect due to volatilization, and their effective lives were only about one year at the most. For this reason, thereafter, it was necessary to spray an anti-mite spray or to heat-dry at 50 to 70 ° C. for 1 hour or more.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, is safe for the human body, and is
It has been completed in order to provide an insect-proof tatami mat that can exhibit a stable mites-preventing effect for a long period of about a year.

[0004]

Means for Solving the Problems The present invention, which was made to solve the above-mentioned problems, provides a tatami-bed, a tatami-mat, or an intermediate layer thereof with B ₂ at a rate of 1 to 300 mg / g / Hr at 20 ° C. It is characterized in that a boric acid-based glass powder that elutes O ₃ is bonded.

The boric acid glass used in the present invention is B ₂
O ₃ as main components _{B 2 O 3 -SiO 2 -Na 2} O _{-based, B 2 O 3 -Na 2 O} -RO system (R
Is an alkaline earth metal), B ₂ O ₃ -Na ₂ O-Al ₂ O ₃ type glass, etc., and dissolves gradually from the surface in water or in a humid atmosphere to elute B ₂ O _3. Is something that can be done. The elution rate can be controlled by the powder particle size and the glass composition, and in the present invention, it was adjusted so that B ₂ O ₃ can be eluted at a rate of 1 to 300 mg / g / Hr in water at 20 ° C. Use one. However, this elution rate shall be measured using glass powder with a particle size of 500 μm. If the B ₂ O ₃ elution rate of the boric acid-based glass measured in this way is less than 1 mg / g / Hr, it is difficult to obtain a sufficient anti-mite effect, and if it exceeds 300 mg / g / Hr. It is not preferable because it shortens the life.

The above boric acid glass has extremely low toxicity. As a result of an acute oral toxicity test using mice at the Japan Food Analysis Center, B ₂ O ₃ 80 mol%, SiO ₂ 10 mol% for the Na ₂ O 10 mole% of the glass was LD ₅₀ mice = 3250mg / g. Further, with respect to the glass of B ₂ O ₃ 45 mol%, SiO ₂ 40 mol%, and Na ₂ O 15 mol%, LD ₅₀ mouse was 5000 mg / g or more.

According to the present invention, when boric acid glass powder is adhered to the tatami floor, it is preferable to disperse 1 to ²⁰⁰ g per 1 m ² of the tatami floor in the tatami floor. When boric acid-based glass powder is adhered to the tatami mat, it is preferable to adhere 1 to ²⁰ g per 1 m2 of the tatami mat to the inner surface. In this case, it is possible to knead boric acid-based glass powder into the inside of the synthetic fiber tatami mat, but it is necessary to have a fiber structure in which the boric acid-based glass powder is exposed on the surface of the fiber. Furthermore, when bonding boric acid glass powder to paper or non-woven fabric (polyester, nylon, etc.) that wraps the tatami floor, 1-20 per 1 m ²
It is preferable to bond g. 0 instead of paper or non-woven fabric.
It is also possible to use a film having boric acid glass powder carried on a film provided with about 10 to 1000 punch holes of 1 mm or less per cm ^2, but in this case, the film is stretched in the manufacturing process and It is preferable that the boric acid glass powder kneaded in is exposed on the surface of the film.

[0008]

[Function] Such boric acid glass powder is used for tatami floor, tatami mat,
Alternatively, the insect-proof tatami mat of the present invention adhered to those intermediate layers,
Under conditions of high temperature and high humidity suitable for reproduction of mites, the amount of B ₂ O ₃ eluted increases, and as shown in the following examples, excellent mites-preventing effect can be exhibited. Moreover, this boric acid-based glass is more safe than conventional organic chemicals, and can exhibit a stable anti-mite effect for a long period of time without volatilizing. Examples of the present invention will be shown below.

[0009]

【Example】

[Example 1] B ₂ O ₃ 60 mol%, SiO ₂ 20 mol%, Na ₂ O 1
A boric acid-based glass powder having a composition of 0 mol% and CaO 10 mol% and a particle diameter of 40 μm was prepared and bonded to a kraft paper wrapping a tatami floor at a rate of ² g / m ² using a cellulose-based adhesive.
The boric acid-based glass used had a particle size of 500 μm.
The dissolution rate of B ₂ O ₃ in water at ℃ was 2.0 mg / g / Hr. We wrapped the tatami floor with this kraft paper and set the insect-proof tatami wrapping the outside on the tatami mat in a new concrete house. For comparison, a non-treated tatami mat and a conventional tatami mat treated with an organic chemical were set in the same manner. Immediately after setting, one year later, two years later, 100 cm ² of straw on the upper surface of the kraft paper was taken and the number of mites was counted.
The following results were obtained.

[0010]

[Table 1]

Example 2 A boric acid glass powder having a particle size of 250 μm and having a composition of B ₂ O ₃ 45 mol%, SiO ₂ 40 mol%, and Na ₂ O 15 mol%, was prepared and made of straw tatami mat. 1 inside the floor
Bonded at a rate of 20 g per m ² . The same test as in Example 1 was performed on this tatami mat. As a result, the number of mites after 2 years was 10 or less per 100 cm ² .

Example 3 The same boric acid glass powder as in Example 1 was adhered to the inner surface of a tatami mat made of rush at a rate of 5 g per 1 m ^{2 using} CMC as an adhesive. With respect to this tatami mat, the number of mites after 2 years was 10 or less per 100 cm ² , and thus an excellent mites-preventing effect could be confirmed.

[0013]

INDUSTRIAL APPLICABILITY As described above, the insect-proof tatami mat of the present invention exerts a stable tick-proof effect over a far longer period than conventional insect-proof mats treated with an organic chemical. You can Further, the insect-proof tatami mat of the present invention uses a boric acid-based glass powder which is safe for the human body, and has an advantage that there is no problem in terms of safety.

Claims (1)

[Claims] 1. A boric acid-based glass powder capable of eluting B ₂ O ₃ at a rate of 1 to 300 mg / g / Hr at 20 ° C. is adhered to a tatami mat, a tatami mat, or an intermediate layer thereof. Insect-proof tatami mat.