JPH0473065A - Multifunctional composite material body - Google Patents

Abstract

PURPOSE:To provided a multifunctional composite material having mildew proofing and moth proofing capacities with excellent moisture and water absorptivity by mixing a simultaneously porous inorganic body to keep vegetables and fruits fresh with the absorption of an ethylene gas or the like while a sodium polyacrylate is mixed. CONSTITUTION:A first laminate sheet body 10 is made up of a breathing and water-absorptive support 12 and a water absorbing agent 16 comprising sodium polyacrylate dispersed between the support and a porous film 14 which has pores cut but is non-water permeable though able to breath. The support 12 and the breathing porous film 14 are joined together by a heat sealing. A second laminate sheet body 18 is made up of a simultaneously porous organic powder 24 interposed between supports 20 and 22 each comprising a water-absorptive unwoven cloth or the like. The second laminate sheet body 18 is stuck on the top surface of the support 12 of the first laminate sheet body 10 using an adhesive 26. Thus, a multifunctional composite material is produced which makes an odorous gas non-odorous while being capable of absorbing moisture and water quickly and in large quantities.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to multifunctional composite bodies.

(Prior Art) As a conventional deodorizing/liquid absorbing composite material body, there is a composite material body developed by the present inventor. (Unexamined Japanese Patent Publication No. 147468/1983)
.

This composite material body is made by impregnating a water-absorbing support such as nonwoven fabric or paper pulp with a deodorizing liquid, and then laminating multiple sheets of this support. A waterproof sheet is attached to the lower surface, and a stabilized chlorine dioxide adsorbent and a moisture-absorbing/dispersing material such as silica gel are scattered in the upper support layer.

This composite material body has multiple functions such as deodorizing bad odors from corpses, keeping vegetables etc. fresh, sterilizing, and being excellent in water absorption.

However, due to the lack of gas absorption capacity, there was a problem that the sustainability of the freshness-keeping ability of vegetables, etc., was somewhat inferior.

(Object of the Invention) Therefore, the inventor conducted extensive research to solve the above-mentioned problems and finally achieved the present invention.

That is, an object of the present invention is to provide a multifunctional composite material body that is excellent in moisture absorption, water absorption, deodorization, insect repellency, and mold resistance, and particularly has excellent deodorization and long-lasting ability to maintain the freshness of vegetables and the like.

(Means for Solving the Problems) In the multifunctional composite material according to the present invention for the above-mentioned purpose, a water-absorbing agent made of sodium polyacrylate is combined with a support such as a non-woven fabric having breathability and water-absorbing properties. On the support side of the first laminated sheet body which is interspersed and bound with a non-water permeable perforated breathable film, a continuous porous inorganic porous powder is applied to two layers such as a non-woven fabric having breathability and water absorption properties. It is characterized in that a second laminated sheet body, which is bound and interposed between the two support bodies, is attached.

It is preferable to impregnate it with at least one of hinokitiol, hinoki oil, and wasabi extract.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

10 is a first laminated sheet body.

This first laminated sheet body 10 has a support body 12 made of nonwoven fabric, split fiber, etc., which has air permeability and water absorption properties, and a support body 12 having air permeability and water absorption properties, and a support body 12 having air permeability and water absorption properties. A water-absorbing agent 16 made of sodium polyacrylate is interspersed between the perforated breathable film 14 made of polyolphene or the like. The support 12 and the perforated permeable film 14 are joined by heat sealing.

In addition, the support body 12 may be provided in two layers of nonwoven fabric or the like, and the water absorbing agent may be interspersed between them.

It is best to keep sodium polyacrylate in a form that is insoluble in water, similar to those used as food additives.

The amount of sodium polyacrylate mixed is 25 to 30 per 1
Approximately g is suitable.

18 is a second laminated sheet body. This second laminated sheet body 18 consists of two supports 20 made of breathable, water-absorbent nonwoven fabric, coarse resin split woven fabric, or the like.
．． An inorganic porous powder 24 having continuous pores is interposed between the holes 22 and 22 . To form this second laminated sheet body 18,
It is preferable to mix a small amount of an organic binder into the inorganic porous powder 24 and press it between the supports 20 and 22.

The inorganic porous body 24 has a crystal structure as shown in FIG.
The cross section of the single fiber does not have a structure in which talc is stacked alternately (Fig. 3), but has a structure in which there are many long tunnel-like holes with a diameter of about 5.6 x 11.0 mm in the fiber. .

Although it looks similar to asbestos, asbestos has a completely different structure, consisting of plate-shaped crystals of talc wound into a roll. Because it has these tunnel-like pores, it has gas absorbency about 60 times that of maifan stone, and it also has a unique adsorption ability to adsorb odor components. Further, the inorganic porous powder 24 has gas absorbing properties and water absorbing properties, and retains or releases these.

In addition to this inorganic porous powder 24, inorganic powder such as silica gel, maifan stone, activated carbon, etc. may be mixed.

The amount of the inorganic porous powder 24 to be mixed is preferably about 150 g per part.

The second laminated sheet body 18 is bonded to the upper surface of the support 12 of the first laminated sheet body 10 using an adhesive 26. As the adhesive for bonding the nonwoven fabrics together, a rubber adhesive is preferable. Also, instead of applying the adhesive all over the surface,
It is best to apply the adhesive partially, such as in the form of a mesh, so that water and moisture can pass through.

Also, since the adhesion between nonwoven fabrics is not very good,
As shown in FIG. 4, the nonwoven fabrics can be bonded together effectively by bonding the nonwoven fabrics through an adhesive sheet in which adhesive is applied to both surfaces of a mesh-like synthetic resin sheet.

When using the multifunctional composite material body constructed as described above, it is preferable to store it in an external decorative cover 28 made of light and soft nonwoven fabric.

Next, the functions will be explained.

Moisture, moisture, odorous gas, etc. from the outside are partially absorbed by the external decorative cover 28 and the supports 20, 22, and most of them pass through and reach the inorganic porous powder 24, where they are collected.

As mentioned above, the inorganic porous powder 24 has continuous porosity and has a gas absorbency about 60 times that of Maifan stone.
The odorous gas is absorbed by the inorganic porous powder 24, its odorous components are adsorbed on the inner walls of the tunnel-like pores, and the odorous gas is released in an odorless state. Furthermore, since the inorganic porous powder 24 has excellent ethylene gas absorption properties, it is effective in maintaining the freshness of vegetables, fruits, and the like. It can be used by directly wrapping vegetables, fruits, etc., or by placing it in a storage container. Furthermore, as will be described later, it is also excellent in absorbing moisture from vegetables, fruits, etc.

Moisture or moisture once absorbed by the inorganic porous powder 24 is eventually released, passes through the support 22.12, and is absorbed by the water absorbing agent 16.

Sodium polyacrylate has extremely high water absorption of about 2.41/rrf. In the case of silica gel, it absorbs rapidly, but when it is saturated with moisture, it loses its ability to absorb moisture completely and releases only a small amount of absorbed moisture. Therefore, we cannot expect much moisture adjustment effect. On the other hand, sodium polyacrylate can absorb moisture and water introduced from the upper part quickly and in large quantities, and also has a certain degree of dissipation ability, so it also has an appropriate humidity control ability.

Table 1 shows the moisture absorption rates of this composite material body (Example) and silica gel.

A test was conducted according to JIS-Z 0701 Silica gel desiccant for packaging.

As is clear from Table 1, the moisture absorption ability of silica gel reaches a saturated state within one week, but in this example, the moisture absorption rate is high and the moisture absorption ability is not lost even after three weeks.

Because of its excellent water absorption, it can be effectively used as wall materials to prevent condensation.For example, when air at 40°C and 11°C reaches 0°C, approximately 117g of dew water will condense on one ceiling surface. However, this composite material body has about 20 times the water absorption capacity, and its water absorption and water retention capacity is about 2400g per bottle. This corresponds to 5.7 to 6.4 kg in terms of silica.

Furthermore, by making sodium polyacrylate insoluble in water, the growth of mold can be effectively prevented.

In the case of water-soluble sodium polyacrylate, since sodium acrylate is kraft polymerized to starch, it is thought that residual nutrients may cause mold to grow.

Since the perforated breathable film 14 does not allow moisture to pass through, the moisture absorbed by the sodium polyacrylate does not leak to the outside. On the other hand, since it has air permeability and moisture permeability, it does not impair the above-mentioned humidity control properties and also contributes to preventing stuffiness in stored items.

It is preferable to impregnate the above composite material with hinokitiol, hinoki oil, or wasabi extract.

Since these have insect repellent and bactericidal effects, they can be made into more multifunctional composite material bodies.

The use of the composite material body of the present invention is not particularly limited, but it can be used for moisture absorption, water absorption, deodorization, and insect repellent by laying it in food containers, etc., it can be used as a wall material to prevent condensation, and it can be stored in a drawer to absorb moisture. It can be suitably used for water absorption, deodorization, insect repellent, and for preserving the freshness of vegetables and fruits.

(Effects of the Invention) As described above, according to the present invention, by incorporating an inorganic porous material with simultaneous porosity, it has excellent gas absorption properties, adsorbs odor components, and has excellent deodorization properties, and also has excellent deodorization properties such as ethylene gas, etc. It is effective in preserving the freshness of vegetables, fruits, etc. by absorbing
On the other hand, by mixing sodium polyacrylate, it is possible to provide a multifunctional composite material that has excellent moisture absorption and water absorption properties, and also has mold and insect repellent properties.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of the composite material body, FIGS. 2 and 3 are explanatory views of the crystal structure of the inorganic porous body, and FIG. 4 is an explanatory view of the adhesive sheet. 10 - support body, 16... body, 24... first laminated sheet body, 12...14... perforated breathable film, - water absorbing agent, 18... second laminated sheet 20.22・
・Support, ・Inorganic porous powder.

Claims (1)

[Claims] 1. The water absorbing agent made of sodium polyacrylate has breathability,
The first laminated sheet body is interspersed and bound between a support such as a water-absorbing non-woven fabric and a water-impermeable perforated film that is air-permeable. The body powder is made of breathable, water-absorbing non-woven fabric, etc.
A multifunctional composite material body, characterized in that a second laminated sheet body, which is bound and interposed between two support bodies, is attached. 2. Claim 1, characterized in that it is impregnated with at least one of hinokitiol, cypress oil, and wasabi extract components.
The described multifunctional composite material body.