JPH0129573B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to toilets, garbage, bathrooms, and even living rooms.
In addition, new deodorizing and moisture absorbing agents that are effective in removing various bad odors that occur in automobiles, livestock sheds, etc. in daily life, and in various manufacturing plants, etc., and also have moisture absorption ability, and their It concerns the manufacturing method.

(Prior art) There are various causes of bad odors. For example, living room, toilet,
Bad odors in bathrooms, cars, etc. are mainly caused by ammonia, hydrogen sulfide, nicotine, trimethylamine,
This is due to acetaldehyde, styrene, methyl mercaptan, skatole, etc.

The above is just an example, and there are various other sources. Deodorizing methods are also adopted depending on the source.

In other words, methods such as washing with water, using alkali, etc., methods of dispelling bad odors by masking with fragrances, etc.
Furthermore, there are methods that use adsorbents such as activated carbon and zeolite.

(Problems to be Solved by the Invention) The water washing method and the method using chemicals such as acid and alkali require large-scale equipment, which is economically disadvantageous.
Moreover, products are generated by chemical reactions such as neutralization, and these treatments are also required. Also, the use of fragrances is not a fundamental solution. In addition, activated carbon from coconut shells is known as an adsorbent, but it is expensive, it is virtually impossible to reuse it, and there are also problems in terms of quality. In the case of industrial use, it can be used practically even if the equipment is large-scale as long as it has a corresponding effect, but it is easy to manufacture as a deodorizing agent for removing bad odors emitted from the home environment, etc.
It is required to have an excellent deodorizing effect and to be easy to install. Further, it is desired that the effective time is longer and that regeneration and activation are easier.

(Means for Solving the Problems) In order to achieve the above object, the present inventors have conducted various studies and found that porous calcined allophein produced by sintering ALLOPHANE has excellent deodorizing ability. Furthermore, the present invention was completed after discovering that it also has moisture absorption ability and can be regenerated and activated.

That is, the present invention relates to a deodorizing and moisture absorbing agent containing porous calcined allofein as an active ingredient. This deodorizing and moisture absorbing agent is produced by the method of the present invention in which allofein is fired at a temperature range of 150°C to 1000°C and then cooled.

Allofein is a hydrous silicate of aluminum and is produced as naturally occurring colloidal soil in Tochigi, Ibaraki, Iwate, Kagoshima, Tottori and other prefectures, all of which are used in the present invention, but are collectively referred to as Kanuma soil. Red allofein containing high iron content produced in Kanuma City, Tochigi Prefecture, and furthermore, Imaichi City, and yellow allofein containing low iron content produced near Moka City, Tochigi Prefecture, are suitable for the present invention.

That is, in the present invention, these allofeins are heated to 150℃~
By firing at a temperature in the range of 1000°C for several hours, for example 1.5 to 3 hours at normal pressure, and cooling, a porous calcined allofein is obtained, which is used for deodorization and moisture absorption.

When using natural allofein, such as the above-mentioned Kanuma soil, the raw material is first purified by elutriation to remove as many impurities as possible.
Collect the gel-like clay part and air dry it at 30°C to 50°C.
The raw material is dried for several days. This material is then fired as described above. This fired material is porous, and by packaging the required amount and placing it appropriately in a highly breathable material such as Japanese paper, it provides a deodorizing and moisture absorption effect to the placed feces area. .

In addition, in the method of the present invention, during firing
A pressure of up to 100 kgf/cm ² may be applied. An example of the analytical values of the calcined allofein of the present invention thus obtained is shown below.

Ignition loss SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ 16.4 40.2 34.9 3.6 CaO MgO Na ₂ OK ₂ O 2.8 0.9 3.1 0.2 Next, an example of the physical property values is shown below.

Bulk specific gravity 0.39, true specific gravity 2.54, fire resistance (SK) 34 ⁺
(It can withstand 1750°C.) In the method of the present invention, those heated at 150°C to 200°C have a particularly strong deodorizing ability, and due to their affinity for water, those heated at 300°C to 500°C have a particularly strong moisture absorption capacity. It has an excellent ability to heat the reaction at 600°C to 800°C, and since it has a catalytically active surface, it also has the ability to act as a reaction promoter.

In the present invention, fragrances and coloring agents may be added. A suitable amount of chlorophyll can be added to give a pleasant color, and peppermint and diasmine can be added as fragrances to enhance the pleasant effect. Further, the present deodorizing and moisture absorbing agent can be directly inserted into an exhaust gas outlet or a ventilation opening, and can also be used by being stored in a plastic container of any shape having a large number of ventilation holes. Further, from the exhaust gas that has passed through the deodorizing and moisture absorbing agent, not only the malodorous components but also the fine dust particles contained in the passing gas are removed at the same time.

This product also acts as a decolorizing agent for petroleum solvents and as a desulfurizing agent for heavy oils. In particular, this effect is superior to red-colored allofein, which contains a large amount of iron hydroxide, than yellow-colored allofein.

(Effects of the Invention) The present invention makes it possible to use naturally occurring allophein (for example, Kanuma soil), which is present in almost inexhaustible quantities, and has excellent deodorizing and moisture absorbing ability extremely easily with only the simple means of firing. This makes it possible to produce porous calcined allofein. Therefore, it has become possible to supply it at an extremely low price compared to known deodorizing agents such as coconut shell activated carbon. Moreover, the deodorizing agent of the present invention is superior to the above-mentioned known deodorizing properties in that it also has moisture absorption ability. Furthermore, the deodorizer of the present invention can be recycled and is superior to known deodorizers in this respect as well.

Next, the present invention will be explained with reference to examples.

Example 1 Natural allofein (Kanuma soil) is baked at 200℃ for 2 hours and air-cooled to produce porous baked allofein wrapped in Japanese paper and placed in a chest of drawers with camphor as an insect repellent. When left in storage, the odor of camphor that permeated clothing disappeared, eliminating the odor to such an extent that it was impossible to distinguish it from human odor, and at the same time, it was possible to store it in a dry state without detecting the growth of mold.

Example 2 In order to investigate the deodorizing effect on the nicotine odor from cigarettes that accumulates in the interior of a car, the porous calcined allofein used in Example 1 was installed in the air circulation path, and it was confirmed that it was so strong that it could not be detected even by smokers' olfactory senses. disappeared.

Example 3 Natural allofein (Kanuma soil) at 200℃ and 500℃
When I mixed porous calcined allofein produced by baking at ℃ for 2 hours and wrapped it in Japanese paper and placed it in a refrigerator, I noticed that not only did it smell like onions, garlic, chives, etc., but it also smelled all over the surface. All the water droplets that had adhered to it also disappeared.

Example 4 Wearing a deodorizing mask equipped with porous calcined allofein prepared under the same conditions as in Example 3, we smelled rotten tofu, garbage, and human excrement in a designated room. As a result, a good deodorizing effect was obtained without causing any discomfort to the inhalation or breathing during use, and without causing any aversion due to bad odors.

Example 5 Natural allofein (Kanuma soil...Ingredient weight%...
_SiO2 38.4%, _{Al2O3 33.2} %, _{Fe2O3 3.5} %, CaO2.7
%, MgO 0.9%, Na ₂ O 3.0%, water 18.3%) 1000g
Heated in a calcining pot at 160℃ for 2 hours and then cooled to form porous calcined allophein (components: SiO ₂ 42.7%, Al ₂ O ₃ 50.3%, Fe ₂ O ₃ 1.0%,
CaO0.2%, MgO0.8%, _Na2O3.3 %, water 1.7%)
Obtained 810g. This material has a specific gravity of 2.3 and a porosity of 80.
The surface area was 265 m ² /g.

200g of this insect repellent was stored together with camphor in a chest of drawers containing clothes wrapped in Japanese paper.

After 10 days, I checked the inside of the chest of drawers, but the smell of camphor had disappeared.
There was absolutely no sensation to the human sense of smell, no mold was observed, and the clothes were stored in a dry state.

Comparative Example 1 In a chest of drawers containing clothes under exactly the same conditions as in Example 5, 100 g of known coconut shell activated carbon was placed instead of calcined allofein.

After 15 days, a slight odor was noticed and mold growth was also observed.

Comparative Example 2 Clay Akadama clay was fired in exactly the same manner as in Example 1 to obtain a sintered body. This sintered body was placed in a chest of drawers in which clothes were stored under exactly the same conditions as in Example 1, instead of the fired allofein, and the deodorizing and dehumidifying effects were measured.

Although some deodorizing effect was observed, it was clearly inferior to calcined allofein and had no dehumidifying effect at all.

Example 6 The calcined allofein of the present invention, which had been used for 100 days according to the method of Example 1 and had decreased deodorizing and moisture absorption ability, was used for 100 days.
After heat treatment at 0.degree. C., the deodorizing and moisture absorbing abilities were completely recovered.

Comparative Example 3 The coconut shell activated carbon used in Comparative Example 1 was heat treated, but there was no change in performance and no heating effect was observed.

Example 7 Allofein produced in Iwate Prefecture was treated in the same manner as in Example 5 to obtain porous allofein. When this product was subjected to deodorization and dehumidification tests in the same manner as in Example 5, it was confirmed that the odor was slightly reduced, indicating that it was effective.

Example 8 Naturally produced allofein (Kanuma soil) having the same components as those used in Example 5 was fired at 600°C and then naturally cooled, about 6 g of which was taken into a dental clinic and filled with an extracted tooth and a detached metal crown. The odor inside the container had completely disappeared after 2 to ³ hours.

Claims (1)

[Claims] 1. A deodorizing and moisture absorbing agent containing porous calcined allofein as an active ingredient. 2. A method of producing porous fired allofein by firing allofein at a temperature range of 150°C to 1000°C and then cooling it.