JPS63283722A - Improved hygroscopic agent in tablet form - Google Patents

Abstract

PURPOSE:To obtain a hygroscopic agent which is easy to tablet without increasing the volume itself, even if the volume of a hygroscopically active component increases due to the moisture absorption, by tableting the same after mixing a sublimable solid substance with an anhydrous salt of a compound which is small in deliquescence and capable of retaining the absorbed moisture as water of crystallization. CONSTITUTION:A hygroscopically active component is at least one member selected from the anhydrous salts of dibasic sodium phosphate, sodium diphosphate, aluminum sulfate, aluminum potassium sulfate and sodium sulfate. By tableting a mixture therewith of a sublimable solid substance such as paradichlorobenzene on a tablet machine, a hygroscopic agent is obtained in a tablet form. In doing so, the sublimable solid substance sublimes progressively to a gaseous state when used as a hygroscopic agent and, therefore, even if the hygroscopically active component increases in volume by absorbing the moisture of the air, an increase in the total volume of the hygroscopic agent can be prevented. The admixture of the sublimable solid substance adds to an effective amount of the hygroscopically active component, leading to an efficient tableting with an excellent interlinkage of the tablet.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a dehumidifier, particularly a tableted dehumidifier suitable for use in clothing and the like. Furthermore, the present invention relates to a tabletted dehumidifier that can also have an insect repellent effect.

(Prior Art) When clothes and the like are stored in a chest of drawers or the like, they absorb moisture from the air, become humid and grow moldy, so they are usually stored together with a dehumidifier. Conventionally, it is well known that a highly hygroscopic compound such as calcium chloride or magnesium chloride is placed in an air permeable container such as paper as a dehumidifier.

However, such compounds have extremely strong hygroscopic properties, so while they are effective in dehumidifying the atmosphere and preventing moisture absorption from clothing and the growth of mold, they also have strong deliquescent properties, so they absorb moisture from the air. As time passes, it becomes muddy and eventually becomes an aqueous solution.

In such a situation, since the container is made of paper, etc., which requires breathability, the cotton dehumidifier in the form of an aqueous solution may seep out of the container and contaminate clothing, chest of drawers, etc. In some cases, the container itself was even damaged.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have developed an anhydrous salt of a compound that has extremely low deliquescent properties and can retain absorbed water as crystal water as a moisture-absorbing active ingredient. It was discovered that the above-mentioned problems could be solved by using the above-mentioned method, and this was proposed in Japanese Patent Application No. 61-38300.

The dehumidifying agent of the invention described in Japanese Patent Application No. 61-38300 uses an anhydrous salt such as dibasic sodium phosphate as an active moisture-absorbing ingredient, preferably white carbon.

Since it contains small amounts of talc, vermiculite, perlite, etc., it is possible to solve the problem of contaminating clothes, chest of drawers, etc., which is a drawback of the conventional dehumidifiers mentioned above. Furthermore, this dehumidifying agent has a large dehumidifying ability, and even if it absorbs moisture in the atmosphere, the moisture-absorbing active ingredient itself does not deliquesce or become an aqueous solution, so it is basically an extremely excellent dehumidifying agent.

Note that this dehumidifier is used by being stored in a breathable container, usually a container made of paper, breathable film, or the like.

However, according to subsequent research by the present inventors, perhaps because this dehumidifier is in powder form, it may cause a very unique phenomenon in which the volume expands as moisture absorption progresses, and the interior becomes hollow. I understand. in this case,
Volumetric expansion (apparent volumetric expansion) is even more pronounced.

Further, in the final stage of moisture absorption, the powdered dehumidifier becomes hard and solidified, and the shape of the solidified material may partially become knife-like. It has been found that in such a state, there is a problem in that the volumetric expansion and the solidification in the shape of a knife combine to cause damage to the container.

Note that the above problem can be avoided by significantly increasing the amount of white carbon, talc, vermiculite, etc. added.
In other words, this leads to a decrease in the content of moisture-absorbing active ingredients, which leads to a significant decrease in dehumidification ability, which is a problem.

As a result of continued studies to solve this problem, the present inventors discovered that the moisture-absorbing active ingredient of the above-mentioned dehumidifier is an anhydrous salt of a compound that has very low deliquescent properties and can retain absorbed water as crystal water. It was discovered that if it is made into a tablet, the hygroscopic active ingredient expands in volume during use, but does not become hollow, and does not solidify into a knife-like shape.
It was proposed as No. 94995.

The tablet-type dehumidifier of the invention described in Japanese Patent Application No. 61-294995 has problems in use with the dehumidifier previously proposed in Japanese Patent Application No. 61-38300, namely, when the dehumidifier is used, The dehumidifier solidifies with a hollow interior, which causes significant apparent volumetric expansion, and furthermore, the solidified dehumidifier becomes partially knife-like in shape, eliminating problems such as damage to the container. I was able to do it.

However, the problem of volumetric expansion due to moisture absorption of dehumidifiers has not been solved at all, so it was necessary to make the packaging container larger to compensate for the volumetric expansion.

In addition, in order to efficiently form tablets, the moisture-absorbing active ingredient must have good fluidity and tablet cohesion before tabletting, so white carbon, talc, etc. Problems remain, such as the need to add and mix a small amount of one or more of vermiculite, perlite, tricalcium phosphate, microcrystalline cellulose, methylcellulose, starch, potato starch, and the like.

(Means and effects for solving the problem) In order to solve this problem, the inventors of the present invention continued to conduct intensive studies, and found that the moisture-absorbing active ingredient of the above-mentioned dehumidifier, that is, the deliquescent property is very low. Furthermore, the inventors discovered that the above problems could be solved by adding and mixing a sublimable solid substance to an anhydrous salt of a compound capable of retaining absorbed water as crystal water, and then forming the mixture into tablets, leading to the completion of the present invention. It is something.

That is, the present invention uses a small amount of each anhydrous salt of dibasic sodium phosphate, sodium pyrophosphate, aluminum sulfate, potassium aluminum sulfate, and sodium sulfate as a hygroscopic active ingredient, and the hygroscopic active ingredient is a sublimable solid substance. This is an improved tablet-type dehumidifier, characterized in that it is made by adding and mixing the ingredients and then forming the mixture into tablets.

The present invention will be explained in more detail below.

The anhydrous salts of dibasic sodium phosphate, sodium pyrophosphate, aluminum sulfate, potassium aluminum sulfate, and sodium sulfate used as moisture-absorbing active ingredients of the dehumidifier in the present invention may be commercially available industrial salts, and their intended use is As can be understood from the above, it is not necessary to use particularly high-purity salts.Also, commercially available hydrated salts may be calcined to form anhydrous products.In addition, this moisture-absorbing active ingredient can be made into granules or tablets. It is more preferable because it is easy.

The dehumidifier of the present invention is obtained by adding and mixing a sublimable solid substance to the moisture-absorbing active ingredient, and then forming the mixture into tablets.
The sublimable solid substance used in the present invention may be any substance as long as it is in the form of powder or granules and can be sublimated. Typical examples include paradichlorobenzene, naphthalene, camphor, empensuline, etc. It will be done. Since all of these substances have an insect repellent effect, they are conveniently formed into tablets after being mixed with a moisture-absorbing active ingredient and used as a dehumidifier, since they also have an insect repellent effect.

In addition, if a sublimable solid substance is added to the moisture-absorbing active ingredient, the fluidity of the moisture-absorbing active ingredient will be improved, so it can be conveniently made into tablets efficiently.1. Furthermore, since the binding property is improved, good tablets can be obtained. It should be noted that the sublimable solid substance may of course be in the form of a powder, but if a granule with a particle size of about 1 to 2 grains is used, it can be made into tablets more effectively and can also be used as a dehumidifier. This is advantageous because the sublimable solid material is more easily sublimed during use. As for this sublimable solid material, commercially available industrial materials are preferably used.

The amount added is preferably about 10 to 300 parts per 100 parts by weight of the moisture-absorbing active ingredient (hereinafter "parts by weight" is simply abbreviated as "parts").

In the present invention, it is necessary to tablet the hygroscopic active ingredient to which the sublimable solid substance has been added and mixed, but tabletting can be carried out by a commonly known method using a tablet press. and,
The size of the tablet is preferably about 5 to 30 days in diameter and 5 to 15W in thickness. The tableting pressure varies depending on the size of the tablet, but
It is usually preferable to tablet it at about IT/-.

The shape of the tablet in the present invention is generally disc-shaped as shown in FIG. 2 (Hata), but if it is desired to increase the moisture absorption rate, this can be done by increasing the surface area.

Therefore, in this case, by replacing the parts of the tablet press, the shape of the tablet can be changed to a chrysanthemum or star shape as shown in Figure 2 (C), (a), (fl), or mountain), (d
), the inside of the tablet may be made hollow.

The form in which the tablet-type dehumidifier of the present invention is actually used is as follows:
It is preferable to use the tablet-type dehumidifier by storing it in a container made of a breathable packaging material. In other words, the tablet-type dehumidifier of the present invention can be used by storing it in a conventionally known moisture-permeable container such as paper or breathable film. For example, it is effective as a dehumidifier for clothing, etc., and can also be expected to have an insect repellent effect.

(Example) Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 5 g of powdered dibasic sodium phosphate anhydrous salt and 5 g of granular noparadichlorobenzene (particle size 1 to 2 cm) were mixed well, and the mixture was pressed using a tablet machine at IT/-〇 tableting pressure. A tablet-shaped dehumidifier having a diameter of 25 fi and a height of 12 cranes as shown in FIG. 2 was obtained. The tablets were placed in a container made of a breathable film (manufactured by combining a special olefin resin and a fine special filler; the trade name is Espoir, manufactured by Mitsui Toatsu Chemical Co., Ltd.) and a polyethylene film, as shown in Figure 3. and the tablets housed in this container at a temperature of 30
The tablets were placed in a desiccator shown in FIG. 1 in a constant temperature room kept at 0.degree. C. and left for one month, and the state of expansion of the tablets was observed. 1
After several months, the tablet was considerably smaller than its original size, and the dibasic sodium phosphate, in which most of the paradichlorobenzene had sublimed, was about 3g'1l below the surface of the tablet.
ll! It was in the form of IL granules. When we measured the water content in this granular dibasic sodium phosphate, we found that
The value was about 50% by weight, and it functioned well as a dehumidifier.

In addition, for dibasic sodium phosphate, which had become granular and peeled off, the expansion in volume due to absorption of moisture was offset by the dissipation due to sublimation of paradichlorobenzene, and no volume expansion was observed as a whole. .

Comparative Example 1 5 g of powdered dibasic sodium phosphate anhydrous salt was mixed with I? A tablet-shaped dehumidifier having a diameter of 20 fins and a height of about 8 fins as shown in FIG. 2(a) was obtained. The tablets were placed in a container made of the same breathable film and polyethylene film as in Example 1, as shown in Figure 3, and left in a desiccator under the same conditions as in Example 1. After one month, the tablets expanded. I made an observation. The results showed that the moisture absorption amount of dibasic sodium phosphate was 4.7 g, which was good, but the volume of the tablet expanded to approximately double, and the breathable film was on the verge of breaking.

Example 2 Granular dibasic sodium phosphate anhydrous salt (particle size 1-2 m)
3.3 g and 6.7 g of granular paradichlorobenzene, the same as that used in Example 1, were thoroughly mixed, and the mixed product was processed into I? The tablets were compressed with a tableting pressure of
Tablets having the shape shown in 1) with a diameter of 2 sm and a height of about 12 fi were obtained. These tablets were placed in a container made of a breathable film and a polyethylene film as shown in FIG. The tablets were placed in the desiccator shown in the figure and left for one month, and the state of expansion of the tablets was observed.After one month, most of the paradichlorobenzene had sublimed, and the remaining dibasic sodium phosphate The tablets did not retain their original shape and were in the form of granules with a particle size of about 1 to 4 grains.

When the moisture content in this granular dibasic sodium phosphate was measured, the value was approximately 50% by weight, indicating that it was fully functioning as a dehumidifier. Further, as in Example 1, no volumetric expansion was observed in the granular dibasic sodium phosphate as a whole.

(Effects of the Invention) As described in detail above, conventional dehumidifiers containing calcium chloride, magnesium chloride, etc. as moisture-absorbing active ingredients have a dehumidifying effect, but their deliquescent properties are too large, so when used as a dehumidifier, the ingredients There was a big problem in practical use that there was a risk that the liquid would deliquesce and flow out and contaminate clothing and the like.

In view of this, the present inventors have discovered that dibasic sodium phosphate,
We have proposed a dehumidifier containing at least one of the anhydrous salts of sodium pyrophosphate, aluminum sulfate, potassium aluminum sulfate, and sodium sulfate as an active moisture-absorbing ingredient, and have almost solved this problem.

However, perhaps because the moisture-absorbing active ingredient in this dehumidifier is a powder, the volume expands significantly as moisture absorption progresses during use.
Moreover, it has been found that there are cases in which a unique phenomenon occurs in which the inside becomes hollow. At this time, the volumetric expansion (apparent volumetric expansion) is even more remarkable. Also, at the end of moisture absorption,
There was a very serious problem in that the powdered moisture-absorbing active ingredient would clump together, and the shape of the clumps could partially become knife-like, causing damage to the container.

As a result of subsequent needle reading, the inventors of the present invention found that if the moisture-absorbing active ingredient of a dehumidifier is made into a tablet, the above-mentioned problem caused by the caking of the moisture-absorbing active ingredient during use can be solved. proposed as a number.

However, although the dehumidifier proposed by this proposal was able to greatly reduce the volumetric expansion during use, it did not eliminate this problem and some volumetric expansion was unavoidable.
It is necessary to make the packaging container large enough to accommodate the volumetric expansion.Also, in order to improve the efficiency of tabletting and obtain tablets with good cohesiveness, it is necessary to add white carbon, talc, bar, etc. to the moisture-absorbing active ingredients. It was necessary to add and mix Miculite, etc. and then form into tablets.

In contrast, the improved tablet-type dehumidifier of the present invention uses the above-mentioned moisture-absorbing active ingredient, that is, an anhydrous salt of a compound that has very low deliquescent properties and can retain absorbed water as crystal water, as a moisture-absorbing active ingredient. After adding and mixing sublimable solid substances such as paradiclobenzene, naphthalene, camphor, empenthrine, etc. to the moisture-absorbing active ingredient, this is made into tablets, so when used as a dehumidifier, this sublimable solid substance is Even if the moisture-absorbing active ingredient sublimates and evaporates over time and expands in volume by absorbing moisture in the air, the dehumidifier as a whole can prevent volumetric expansion.

Further, the above-mentioned sublimable solid substance can be used as a dehumidifying agent for clothing and the like, and has an insect repellent effect, so it is advantageous in this respect as well.

Furthermore, by adding and mixing a sublimable solid substance to the moisture-absorbing active ingredient, fluidity is imparted to the moisture-absorbing active ingredient, making it possible to form tablets efficiently.Also, the tablets have good cohesiveness, which is good. It also has the effect of providing tablets with a high quality.

Therefore, like the tablet-type dehumidifier proposed by the present inventors in Japanese Patent Application No. 61-294995, white carbon,
It is possible to obtain a tablet-shaped dehumidifier efficiently and with good binding properties without adding Kuruji or the like.

[Brief explanation of the drawing]

Figure 1 is a front view of the device used to measure the amount of moisture absorbed by the dehumidifier in each Example and Comparative Example, and Figure 2 is a diagram showing each embodiment of the shape of the tablet-type dehumidifier of the present invention. be. Also,
FIG. 3 is a diagram showing the packaging state of the tablet-type dehumidifier of the present invention. In each figure, ′□ l--- Desiccator body, 2-- Desiccator lid, 3-- Wire mesh, 4-- Packaged dehumidifier sample, 5...-
・-Water, 6-... Breathable film, 7--Polyethylene film, 8-...
・Indicates a dehumidifier. Patent applicant: Mitsui Toatsu Chemical Co., Ltd. Figure 1 Ce) (f) Figure 2

Claims (3)

[Claims] (1) Sodium diphosphate, sodium pyrophosphate,
An improvement characterized in that at least one of anhydrous salts of aluminum sulfate, potassium aluminum sulfate, and sodium sulfate is used as a moisture-absorbing active ingredient, and after adding and mixing a sublimable solid substance to the moisture-absorbing active ingredient, the mixture is made into a tablet. tablet-type dehumidifier. (2) The improved tablet-type dehumidifier according to claim 1, wherein the sublimable solid substance is a substance having an insect repellent effect. (3) Sublimable solid substances with insect repellent action include paradichlorobenzene, naphthalene, camphor, empenthrine (emp
Claim 2, which is any of the following:
The improved tablet-type dehumidifier described in Section 1.