JPS60143819A - Dehumidifying agent - Google Patents

Abstract

PURPOSE:To inhibit fluidization of deliquescence and to make handling and confirmation of moisture absorption limit easy by constituting a dehumidifying agent with deliquescent salts having hygroscopic properties and polysaccharides which swell with water of normal temp. to gel. CONSTITUTION:Deliquescent salts having hygroscopic properties such as CaCl2 and polysaccharides such as carboxymethyl cellulose and glucomannan having gelling properties by swelling with water of normal temp. are granulated or pulverized and thereafter mixed. Thus, the obtained duhumidifying agent is sealed in a bag or a vessel made of a moisture permeable film or nonwoven fabric to use. Since humidifying agent gels according to water absorption, the moisture absorption limit can be confirmed when the dehumidifying agent in service has attained the limit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dehumidifying agent using deliquescent salts having hygroscopic properties.

For example, salts such as calcium chloride have excellent water absorption properties, but because they deliquesce due to water absorption, they have the disadvantage that they can be used as dehumidifiers in a limited manner and where they can be used.

In order to eliminate this drawback, some or all of the water is used.

A bag or container made of a synthetic polymer sheet or non-woven fabric that is impermeable to aqueous solutions and has moisture permeability is filled with a mist containing lucium chloride or calcium chloride along with an adsorption base such as a sponge or pulp fiber mat (as described above). sealed in a bag or container, for example, JP-A-57-20963
As disclosed in Japanese Patent Application No. 8, there is one in which calcium chloride is supported on a porous carrier such as vermiculite or perlite.

Among the conventional methods described above, the first method is that the moisture permeable sheet of the bag or container is torn due to pressure or other causes.
Deliquescent salt leaks onto furniture and clothes.

It has the disadvantage of staining rugs, etc. The second method has the same drawbacks as above, and also has the drawback that it requires an adsorption base several times as large as that of calcium chloride, making the entire product bulky. Furthermore, the third method has the disadvantage that when the calcium chloride at the entrance of the pores of the porous carrier deliquesces, the pores are blocked, and the calcium chloride inside the pores no longer absorbs moisture, resulting in a poor moisture absorption rate. Furthermore, with conventional dehumidifiers, it is not possible to confirm that the moisture absorption limit has been reached, and people often use dehumidifiers without knowing that they have reached their moisture absorption capacity.

Furthermore, recently, dehumidifiers made by mixing calcium chloride with a synthetic polymer absorbent have been considered. However, although polymeric absorbents absorb fresh water several hundred times more than natural hair, experiments have shown that they decompose in aqueous solutions containing II-based salts and are not effective. .

The object of the present invention is to provide a dehumidifier that eliminates the above-mentioned drawbacks, and the dehumidifier according to the present invention has the following features:
It is characterized by containing a hygroscopic deliquescent salt and a polysaccharide that has the property of swelling and gelatinizing with water at a normal temperature.

Deliquescent salts with 41 hygroscopic properties include calcium chloride, I
! There are magnesium A oxide, lithium 111 oxide, and others, but calcium oxide is the most suitable in terms of economy, ease of introduction, safety, moisture absorption rate, etc. Salts are used in granular or powdered form. .

The polysaccharides used in the present invention are 1, such as carboxymethyl cellulose (hereinafter referred to as rcMcJ), methyl cellulose (hereinafter referred to as rMCJ), konjac powder, and glucomannan, which swell with water at normal temperatures and form a gel. These polysaccharides are used in the form of granules or powder.

According to the dehumidifier of the present invention, when the salt absorbs moisture and deliquesces, the polysaccharide swells with the deliquescent salt (hereinafter referred to as "deliquescent liquid") and becomes gel-like, acting to prevent the flow of the deliquescent liquid. .

The ratio of polysaccharide to the salt is not particularly limited. Even if the amount of polysaccharides is small, the deliquescent salts will flow, but the whole will be soft, and if there is a large amount, the whole will only become hard. When using polysaccharides such as glucomannan and konjac powder, if the ratio of polysaccharides to salts is 10% by weight, the whole becomes a somewhat hard jelly-like state, and the ratio of polysaccharides to salts is 20%.
The hardness is about 1cm thick, so it won't break if you pinch it with your fingers. Therefore, when using the above polysaccharides, the ratio of polysaccharides to type 1!1 should be 10% to 2% by weight.
When using a polysaccharide such as CMC or MC, which can be used in an amount of about 0%, it will not become jelly-like unless m kl 1L2o% or more is used relative to the salt.

In addition, the dehumidifier expands because the polysaccharide swells with the deliquescent liquid. The expansion of this body Jt"t varies somewhat depending on the polysaccharide used, but is proportional to the deliquescent liquid, that is, the water absorbed by the salts used. In this case, the volume of the dehumidifier expands to more than 2 to 2 times its original volume.

When actually using the dehumidifier according to the present invention, moisture permeability t1
In a bag made of filtration or non-woven fabric, or a container partially made of the above-mentioned film or non-woven fabric.'' - 1 person. In addition, if you use a bag made of moisture-permeable film or non-woven fabric and put one or several pieces in a container with ventilation holes, you can discard the dehumidifier that has lost its moisture-absorbing ability and use it as a new dehumidifier. Can be replaced with a bag containing medicine. In addition, when used as described above, the deliquescent salts and polysaccharides may be mixed, or the salts and polysaccharides may be placed in the same bag or container without mixing to form a gel-like solution. can be converted into When enclosing the dehumidifier in a bag or container, it is necessary to use a bag or container whose volume is at least as large as the volume of the dehumidifier expands.

Since the dehumidifier according to the present invention absorbs water and turns into a gel, it is possible to confirm when the dehumidifier in use reaches its moisture absorption limit. If all or part of the container or bag to be sealed is transparent, if you mix an appropriate amount of dye that develops color with moisture into the dehumidifier, you can check at a glance whether the dehumidifier is effective or not. be able to.

The present invention will be explained in detail below.

Place the salts and polysaccharides to be used in an open transparent bottle on each side as shown below, place them in the same humid compartment, observe the gelation state of each, and check the final results for the original contents. The volume increase ratio and the hardness state of the gel-like material were investigated.

(Mixed with 400g of granular calcium chloride and 40g of powdered glucomannan.

(Mixed with 400g of granular calcium chloride and 60g of powdered glucomannan.

(9. Mix 400g of powdered calcium chloride and 80g of powdered glucomannan.

(d), 80 g of powdered glucomannan was added and 400 g of granular calcium chloride was added thereto.

(Su0 granular 11! calcium chloride 400g, powdered C
Mixed with 40g of MC.

+I), 400g of powdered calcium chloride, powdered C
Mixed with 60g of MC.

(Gun 0 granular 11! calcium chloride 400g, powdered C
Mixed with 80g of MC.

Results Except for gelation state (!II), gelation occurred sequentially downward from L- and force. (φ was gelatinized from the boundary between glucomannan and calcium chloride.

Volume increase ratio It was 2 times to slightly more than 2 times higher in all cases of φ) to ■.

The hardness of the gel-like substance is 4 grains, ■ is the state of jelly, ■, ■ is the state of soft sheep spirits.
! i, (9 was in the state of Peidong yangkin, and ■ and ■ were in the state of slightly soft glue.

In addition, the weight of the gelled contents is at least the original weight, J
il: more than twice as much as il:, up to 2.6 times.

Tests were also carried out using konjac flour and MC as the polysaccharides, and the results obtained were substantially similar to those obtained when glucomannan was used in the former case, and the same results were obtained when CMC was used in the latter case. Moreover, although the above example uses calcium trihydride, the results are similar even if anhydrous calcium chloride is used.

According to Example 1-1, the water absorption breakdown is 1.6 times to 1.6 times that of calcium chloride Azumae, and the water absorption efficiency is good, and the polysaccharide content is 11 to 1.6 times.
It was found that it did not reduce the water absorption rate of Category 1.

The dehumidifying agent according to the present invention described above is a deliquescent lactic acid having hygroscopic property.
i! J1! This prevents the flow of the deliquescent liquid that occurs when salts absorb moisture, making it extremely easy to handle and not staining containers containing dehumidifiers, furniture, rugs, clothing, etc., and preventing the natural moisture absorption of salts. Furthermore, when salts reach their moisture absorption limit, the entire dehumidifier becomes gel-like, so it can be easily confirmed, and it is possible to use a dehumidifier without knowing that it has lost its moisture absorption ability. Defense 11 - Can be done.

Claims (3)

[Claims] (1) A dehumidifier characterized by containing a deliquescent salt having hygroscopic properties and a polysaccharide having the property of swelling and gelatinizing with water at a normal temperature. (2) The dehumidifier according to claim 1, wherein the salt is calcium chloride. (3) The dehumidifier according to claim 1, which is caculcomannan, mannan, konjac powder, carboxymethyl cellulose, methyl cellulose, or a mixture thereof.