JPS61291021A - Method for solidifying desiccant - Google Patents

Abstract

PURPOSE:To prevent the fine powder of a desiccant from scattering to the circumference by solidifying the desiccant, by bonding the desiccant and a resin or rubber material having flowability or coating the former with the latter. CONSTITUTION:A powdery desiccant having chemical hygroscopic effect is mixed with a resin having moisture permeability such as silicone rubber and the resulting mixture is allowed to pack a mold to be cured. In another way, the powdery desiccant is formed into a tablet by a conventional press molding process and the surface of the tablet is coated with silicone rubber. By this method, the scattering of a fine powder is prevented even if the desiccant is expanded during a hygroscopic process.

Description

[Detailed description of the invention] Industrial application field The present invention can be incorporated into drugs, foods, and various equipment, etc.
The present invention relates to a method for forming a desiccant for dehumidification.

Conventional technology Conventionally, desiccant materials have been made in the form of granules such as silica gel, powdered desiccant packed in bags, or molded into a fixed shape by pressure molding, etc. there were.

Problems to be Solved by the Invention Some desiccant materials have a moisture-absorbing structure that is a porous material, such as silica gel, which absorbs moisture into its micropores. This type of material is reversible and has the problem of expelling the adsorbed water under certain conditions.

On the other hand, instead of such porous desiccants, desiccants that chemically capture moisture have also been developed.

This type of desiccant has an advantage over porous desiccants in that it does not release moisture once it has been taken in, but it has the phenomenon of expansion or heat generation during the moisture absorption process. The biggest problem caused by this phenomenon is that it cannot be solidified. In other words, even if the powdered desiccant is solidified by pressure molding etc. in its initial state, it will not be able to maintain its initial shape because it will expand during the process of absorbing moisture.
It breaks down into powder.

There are many important effects that can be obtained by solidifying a desiccant, such as not producing fine 3A-7 powder, increasing the amount per unit volume, and reducing the storage space. It was wanted.

Means to Solve the Problems The present invention has been made in view of the above problems, and is a method of mixing a powdered desiccant with a fluid resin etc. in a desiccant having a chemical moisture absorption effect. By curing this after combining, or by applying a resin to the surface of the desiccant that has been roughly solidified by pressure molding, etc., and then curing this.
The desiccant is solidified by combining or coating the desiccant with a resin.

Function As described above, in the present invention, since the desiccant is bonded to a resin or its surface is coated with a resin, it is possible to prevent the fine powder of the desiccant from scattering around.

Examples Examples of the present invention will be described in detail. The desiccant used in this example is a desiccant having a chemical moisture absorption effect (for example, 020 developed by Oshi Chemical Technology Research Institute).

This desiccant has a superior moisture absorption effect (moisture absorption amount and moisture absorption rate) compared to silica gel, etc., and also has the great feature that once it has absorbed moisture, it does not release it.

On the other hand, the drawback is that the desiccant itself expands during the moisture absorption process. For this reason, even if it is solidified in the initial state by pressure molding or the like, it expands and decomposes as moisture absorption progresses.

Therefore, in order to prevent this, methods such as combining the desiccant and resin or coating the surface of the roughly solidified desiccant with resin are used to prevent the desiccant from decomposing even during the moisture absorption process. I tried not to do that.

Moisture permeability is one of the requirements for the resin to be combined with the desiccant. An example of a material that satisfies this condition is silicone rubber. A desiccant in a desired shape can be obtained by mixing liquid or hand-kneaded silicone rubber and powdered dry 6-page agent, filling it into a desired mold, and removing it when it hardens. Silicone rubber itself has very high moisture permeability, so it does not significantly affect the moisture absorption ability of the desiccant.

Alternatively, the same effect can be obtained by solidifying the desiccant into a predetermined shape using a method similar to conventional pressure molding, and then applying silicone rubber to the surface of the solidified desiccant.

The material for bonding the desiccant is not limited to silicone rubber, but any moisture-permeable material may be used, such as resin or rubber adhesive, and the same effect can be obtained.

If the desiccant is solidified using the method described above, even if the desiccant expands during the process of absorbing moisture, there is no need to worry about the fine powder scattering because each fine powder is bound together with resin, etc. .

Effects of the Invention As is clear from the above explanation, according to the present invention, a desiccant can be solidified by a simple method. That is, since the fine powder of the desiccant does not scatter, it can be safely incorporated into food products, close contact containers, etc. In addition, by solidifying the product, it becomes easier to handle and the space required for assembly can be reduced.

Claims (1)

[Claims] A resin or rubber material having fluidity and a powdered desiccant are mixed together, or the powdered desiccant is formed into a tablet by pressure molding, etc., and the fluidity is applied onto the outer peripheral surface of the desiccant. A method for solidifying a desiccant, which comprises integrating the desiccant and the resin or rubber material by means of applying a resin or rubber material, and then curing the resin or rubber material.