JPH02178337A - Cellulose composition - Google Patents

Abstract

PURPOSE:To obtain a cellulose composition suitably usable as a moisture absorbent having excellent hygroscopic property, continually keeping solid state after absorption of moisture and readily processable, comprising of a deliquescent inorganic compound and a hedroxyalkyl cellulose. CONSTITUTION:(A) 100 pts.wt. deliquescent inorganic compound (e.g. calcium chloride, magnesium chloride or magnesium sulfate) is mixed with (B) 1-200 pts.wt., preferably 3-100 pts.wt. hydroxyalkyl cellulose (e.g. hydroxyethyl cellulose) obtained by adding an alkylene oxide to a cellulose and preferably containing 1.5-6mol, more preferably 1.7-3mol alkylene oxide added to anhydrous glucose unit to afford the aimed cellulose composition. Moisture absorbed by said composition is absorbed in B and the composition becomes to a rice cake- like or rubbery solid, then is readily processable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a cellulose composition that can be suitably used as a moisture absorbent.

(Prior Art) A dehumidifier is known in which a deliquescent inorganic compound is sealed in a container with a sheet that allows moisture to pass through but not liquid. Such a dehumidifier has the advantage that the degree of dehumidification can be visually confirmed because absorbed moisture accumulates in the container as a liquid. However, on the other hand, there was a problem of leakage of liquid within the container due to damage to the container.

In order to prevent the liquid inside the container from leaking, a water retention agent such as boxymethylcellulose or polyvinyl alcohol is sealed in the container together with a deliquescent inorganic compound, and the liquid that has been moistened by the deliquescent inorganic compound and accumulated inside the container is sealed. Attempts have been made to retain water in carboxymethyl μ-cellulose, polyvinyl 7-coat, etc. (Japanese Patent Publication No. 28531/1983).

(H condyle to be solved by the invention) However, in the combination of a deliquescent inorganic compound and the above-mentioned water retention agent, if the amount of the water retention agent is small, it remains liquid or viscous liquid after absorbing moisture and becomes solid. Must not be. In order to maintain the solid state after absorbing moisture, the water retaining agent described above must be used in large quantities and is therefore bulky.

Moreover, even when a large amount of a water-retaining agent is used, the liquid absorption rate of the water-retaining agent is slow, resulting in a long open period until the liquid produced by moisture absorption is absorbed by the water-retaining agent.

(Means for Solving the Problems) In view of the above problems, the present inventor conducted various studies with the aim of developing a moisture absorbent that always remains solid after absorbing moisture and is easy to handle, and completed the present invention. It came to this.

+I, the present invention is a cellulose composition comprising 1 to 200 parts of a deliquescent inorganic compound and 1 to 200 parts of oxyalkyl cellulose.

The second component of the cellulose composition of the present invention is a deliquescent inorganic compound. Deliquescent inorganic compounds have 4 deliquescent properties exclusively for calcium chloride, magnesium chloride, and magnesium sulfate.
Compounds that do the following may be employed without any restrictions.

The other component of the cellulose composition of the present invention is hydroxyalkyl cellulose. Among celluloses, there are many types such as methylcellulose, methylcellulose, and carboxymethylcellulose, or the effects of the present invention cannot be obtained by using these celluloses. The effects of the present invention can only be obtained by using hydroxyalkyl cellulose. Hydroxyalkylcellulose is a compound obtained by adding alkylene oxide to cellulose, and specific examples include hydroxyethylcellulose and hydroxypropylcellulose. The properties of hydroxyalkylcellulose vary depending on the number of moles of alkylene oxide added to the anhydroglucose unit, and when the cellulose composition of the present invention is used as a moisture absorbent,
0. , more preferably in the range of 17 to 30.

The amount of hydroxyalkyl cellulose used must be in the range of 1 to 200 parts by weight per 100 parts by weight of the deliquescent inorganic compound. If the value of hydroxyalkylcellulose is less than the above range, the product obtained by absorbing the liquid accumulated due to moisture absorption into hydroxyalkylcellulose will not become solid, making it inconvenient to handle; If the number of cells is too large, the effect of adding hydroxyalkylcellulose will be negated,
Otherwise, the hydroxyalkyl cellulose will be wasted.

When using the cellulose composition of the present invention as a moisture absorbent, the composition of the deliquescent inorganic compound and hydroxyalkyl cellulose is in the range of 3 to 100 parts by weight of hydroxyalkyl cellulose per 100 parts by weight of the deliquescent inorganic compound. It is preferable to use it in

(Effects) The cellulose composition of the present invention has good hygroscopicity, and since the absorbed moisture is absorbed by the hydroxyalkyl cellulose, it does not become liquid, but forms a solid such as a sticky or rubbery one. Become. Therefore, since the cellulose composition of the present invention remains solid even after absorbing moisture, it is extremely easy to handle.

Moreover, the cellulose composition of the present invention can be produced by one person even when the amount of hydroxyalkylcellulose, one of the components, is small, and the composition always remains solid because it absorbs liquid at a fast rate.

Therefore, the cellulose composition of the present invention can be suitably used as a moisture absorbent.

(Examples) The present invention will be described below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

Example I 100 y of anhydrous calcium chloride powder and 3 to 100 y of hydroxyethyl cellulose (addition of ethylene ogicide per anhydroglucose unit fi 2.s % *) were mixed and placed in a thermostatic chamber at 25° C. and 80% humidity. ,7
After a day, the moisture absorption amount (increase in weight) was measured and the morphology was observed. The results are shown in Table 1.

Table 1 Comparative Examples The same procedure as in Example 1 was carried out except that carboxymethylcellulose or polyvinyl alcohol was used in place of hydroxyethylcellulose. The results are shown in Table 2.

Table 2 50y and the water absorption state was observed.

The results are shown in Table 3.

For comparison, Table 3 also shows the results when μ-boxymethylcellulose was used as a water retention agent.

Table 3 Example 2

Claims (1)

[Claims] (1) A cellulose composition comprising 100 parts by weight of a deliquescent inorganic compound and 1 to 200 parts by weight of hydroxyalkylcellulose.