JP2801226B2 - Adsorbent - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an adsorbent, and more particularly, to a flat or container-shaped adsorbent.

"Prior art and its problems" Adsorbents using granular or powdery adsorbents such as activated carbon,
For example, although widely used as a deodorant for refrigerators, an adsorbent has a property that when it absorbs moisture, that is, when it adsorbs moisture, its gas adsorbing ability rapidly decreases. However, the interior of home refrigerators, which are not specially humidified, have low humidity, and the adsorbent is stored in the case, so there is little possibility of moisture absorption, and this moisture absorption problem will not be highlighted. Was.

On the other hand, the present applicant has found in Japanese Patent Application Laid-Open No. 62-190068 that it is possible to maintain the freshness of fresh products by adsorbing sensible harmful substances emitted from fresh products. It was proposed to provide. The aging hazardous substances are ethylene, ethylene dioxide, phenylethylene, methyl ethyl carbinol, etc. in fresh vegetable products, and volatile base nitrogen trimethylamine in fresh animal products. It is known.

The present inventor has further advanced the technical content of this application, and has developed an adsorbent for more effectively and easily removing aging harmful substances emitted from fresh products. However, in the course of this development, if the adsorbent absorbs a large amount of moisture, the gas adsorbing ability has a property of sharply decreasing. However, the interior of home refrigerators, which are not specially humidified, have low humidity, and the adsorbent is stored in the case, so there is little possibility of moisture absorption, and this moisture absorption problem will not be highlighted. Was.

On the other hand, the present applicant has found in Japanese Patent Application Laid-Open No. 62-190068 that it is possible to maintain the freshness of fresh products by adsorbing sensible harmful substances emitted from fresh products. It was proposed to provide. The aging hazardous substances are ethylene, ethylene dioxide, phenylethylene, methyl ethyl carbinol, etc. in fresh vegetable products, and volatile base nitrogen trimethylamine in fresh animal products. It is known.

The present inventor has further advanced the technical content of this application, and has developed an adsorbent for more effectively and easily removing aging harmful substances emitted from fresh products. However, in the course of this development, the hygroscopicity of the adsorbent was highlighted as a major problem. In other words, the present inventor has found that when these adsorbents are brought into direct contact with fresh products, aging harmful substances can be easily and effectively removed. The effect of adsorbing the substance disappears.

[Object of the Invention] Accordingly, an object of the present invention is to obtain an adsorbent which can be brought into contact with an adsorbent such as fresh food directly or in a very close state, and which has no or little decrease in adsorption capacity due to moisture absorption. And

"Summary of the Invention" The present invention is based on the idea of providing a granular or powdery adsorbent layer on at least one of the front and back surfaces of a gas-permeable plate-shaped substrate in order to directly contact the adsorbent with the object to be adsorbed. age,
Further, in order to prevent the adsorbent from absorbing moisture, it has been completed with the idea of adding a gas-permeable and water-impermeable film layer thereto.

That is, the adsorbent of the present invention is provided with a particulate or powdery adsorbent layer on at least one of the front and back surfaces of a gas-permeable thin sheet substrate, and the particulate or powdery adsorbent includes a fluororesin-based material. It is characterized by having a gas-permeable and water-impermeable film formed by spraying a mixture of a solvent and Freon gas.

Further, the present invention provides that a particulate or powdery adsorbent layer is sandwiched between a pair of air-permeable thin sheet substrates, and that the particulate or powdery adsorbent contains a fluororesin-based solvent containing a fluorocarbon gas. The air-permeable and water-impermeable film formed by spraying the mixture is characterized in that it is attached.

The air-permeable and water-impermeable film of the present invention is formed by using a spray generally known as a waterproofing spray, that is, a spray in which a fluorocarbon resin-based solvent is mixed with Freon gas.
When this is sprayed on a granular or powdery adsorbent, a water-repellent and air-permeable film, that is, a gas-permeable water-impermeable film is formed. The air-impermeable film is formed on the adsorbent before or after it is attached to the plate-like substrate, depending on factors such as the thickness and particle size of the adsorbent to be provided on the plate-like substrate.

When the thin plate substrate is formed from, for example, wooden pulp, it is excellent in air permeability, flexibility, or processability when processing the same into a container. That is, in one mode of use, the present adsorbent is placed directly above or below a fresh vegetable or animal product, or is used as a container in which the fresh product is placed. Therefore, not only air permeability but also flexibility and workability are necessary elements.

Granular or powdery adsorbents are activated carbon, red Ioishi, blue Ioishi (stones from Ioyama, Ishikawa Prefecture, red ones are red Ioishi, blue ones are blue Ioishi) coral, zeolite or It can be composed of these mixtures. Above all, red pearl stone, blue pearl stone, coral, somelite or a mixture thereof is preferable. If potassium sorbate is further added thereto, more excellent adsorption ability and adsorption retention rate can be enhanced.

The particle size of the granular or powdery adsorbent is preferably 500 mesh or more in order to secure a large surface area effective for the adsorption action.

Further, according to the present invention, it is possible to supply a particulate or powdery adsorbent with a gas-permeable and water-impermeable film formed by spraying a mixture of a fluororesin-based solvent and a fluorocarbon gas.

"Examples of the Invention" The present invention will be described below with reference to illustrated examples. FIG. 1 is a conceptual diagram of a sheet-like adsorbent 11 according to the present invention. The sheet-shaped adsorbent 11 has a thin plate base 12 made of wooden pulp at the center in the thickness direction, and a granular or powdery adsorbent layer 13 is formed on the front and back of the thin plate base 12. . The adsorbent layer 13 has a gas-permeable and water-impermeable film 14 formed thereon.

As shown schematically in FIG.
It is desirable that the adsorbent layer 13 is formed uniformly on the individual particles, and the adsorbent layer 13 may be supplied in such a form. However, when the thickness of the adsorbent layer 13 is small, it is practically possible to apply the spray to the thin base material 12 and then spray it for forming a gas-permeable and water-impermeable film (for waterproofing). It is possible to obtain a layer of the adsorbent layer 13 having sufficient water impermeability (water repellency) and gas permeability. The adsorbent layer 13 to be formed on the thin plate substrate 12
When the thickness of the adsorbent is thin, the same spray is sprayed on the adsorbent spread thinly to form a gas-permeable and water-impermeable film 14, and then the adsorbent having the gas-permeable and water-impermeable film 14 is applied to a suitable thickness. Only the thin plate substrate 12 can be attached.

The adsorbent layer 13 having the air-impermeable and water-permeable film 14 may be sandwiched and supported between a pair of thin plate substrates 12, as schematically shown in FIG.

The adsorbent layer 13 is made of activated carbon, red royal stone, blue royal stone, coral,
It is made of zeolite granules or powder, or a mixture thereof, and preferably has a particle size of 500 mesh or more. If the mesh size is less than 500 mesh, a sufficient adsorption area cannot be obtained, and a sufficient adsorption capacity cannot be obtained.
Above all, a mixture of red Ioishi, blue Ioishi and coral has a high ability to adsorb the above-mentioned aging harmful substances of fresh products.

It is preferable that the adsorbent layer 13 is further mixed with potassium sorbate. Potassium sorbate has an effect of preventing the occurrence of mold and is effective when the present sheet-shaped adsorbent 11 is used for a long time. That is, the sheet-shaped adsorbent 11 is used, for example, placed on a fresh product. However, since the fresh product has a high effect of maintaining freshness, it may be used for one week or more. In such a long-term use, calcium sorbate effectively functions to prevent the occurrence of mold. Good results can be obtained by adding about 2 to 3% by weight of the potassium sorbate to the total weight of the adsorbent layer 13.

The following is an example of usage of the sheet-shaped adsorbent 11 of the present invention.

Spread below or above the fruits and vegetables arranged in the package with fruits and vegetables.

It is used as a partition tray for placing fruits and vegetables in a package containing fruits and vegetables.

Lay it on a box containing fresh fish.

The sheet-shaped adsorbent 11 or the thin plate substrate 12 is processed into an egg container, and eggs are put therein.

These modes of use are possible inside and outside the refrigerator. And it was confirmed that the freshness of the fresh product in contact with any of these use modes could be maintained for a long period of time. In other words, due to the non-hygroscopicity (water repellency) of the air-permeable and water-impermeable film 14, a decrease in the adsorbing ability of the adsorbent layer 13 is suppressed, and for a long period of one week or more, aging harmful substances emitted from perishable products are adsorbed and the freshness Drop can be prevented.

The thickness of the sheet-shaped adsorbent 11 of the present invention can be formed in a range of about 0.5 to 5 mm in consideration of factors such as flexibility according to the purpose of use.

 Next, the effects of the present invention will be described based on experimental results.

Material and thickness of the thin plate base material 12; wooden pulp, 0.1 mm Constituent material, ratio and thickness of the adsorbent layer 13; activated carbon 15%, red Ioishi 20%, blue Ioishi 15%, coral 10
%, Zeolite 40% (weight%), thickness 0.38-0.43mm (1st
(Double-sided adsorbent layer type in the figure) Material, forming method and thickness of the air-permeable and water-impermeable film 14;
With respect to the sheet-like adsorbent 11 having a coating thickness of 0.02 to 0.05 mm or more, the original odor having the concentration shown in the following table is circulated in a closed system together with humidified air, and the residual rate and the original odor of the original odor over time are reduced. The time until disappearance was measured.

“Effect of the Invention” As described above, the adsorbent of the present invention can prevent moisture absorption of the adsorbent layer and maintain adsorption performance. In addition, since the adsorbent layer is provided on the thin plate base material, it can be easily brought into contact with fresh products, can be brought into contact with fresh products easily, and the aging harmful substances emitted from fresh products can be effectively removed. , And a decrease in freshness can be prevented. further,
Spraying a mixture of a fluororesin-based solvent and a fluorocarbon gas directly onto a particulate or powdery adsorbent to form a gas-permeable, water-impermeable film enables application to a wider range of applications.

[Brief description of the drawings]

FIGS. 1 and 2 are schematic cross-sectional views showing examples of the adsorbent of the present invention, and FIG. 3 is a schematic view of a gas-permeable impermeable film formed on particles of an adsorbent layer. 11 ... sheet-like adsorbent, 12 ... thin plate substrate, 13 ... granular or powdery adsorbent (layer), 14 ... air-permeable impermeable membrane.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01D 53/04 B01J 20/28

Claims (8)

(57) [Claims] 1. A particulate or powdery adsorbent layer is provided on at least one of the front and back surfaces of a thin air-permeable base material, and a fluororesin-based solvent is added to the particulate or powdery adsorbent to form a fluorocarbon gas. An adsorbent characterized by being provided with a gas-permeable and water-impermeable film formed by spraying a mixture. 2. A particulate or powdery adsorbent layer is sandwiched between a pair of air-permeable thin sheet substrates, and a fluororesin-based solvent is added to the particulate or powdery adsorbent to form a fluorocarbon gas. An adsorbent characterized by being provided with a gas-permeable and water-impermeable film formed by spraying a mixture. 3. The adsorbent according to claim 1, wherein
The adsorbent is made of wooden pulp. 4. The adsorbent according to claim 1, wherein
The granular or powdery adsorbent is an adsorbent made of activated carbon, red iolite, blue iolite, coral, zeolite or a mixture thereof. 5. The adsorbent according to claim 4, wherein the granular or powdery adsorbent is further mixed with potassium sorbate. 6. The adsorbent according to claim 4, wherein
An adsorbent in which the particle size of the granular or powdery adsorbent is 500 mesh or more. 7. The adsorbent according to claim 1, wherein the thin plate substrate has a container shape with predetermined irregularities. 8. An adsorbent characterized in that a particulate or powdery adsorbent is provided with a gas-permeable, water-impermeable film formed by spraying a mixture of a fluororesin-based solvent and a fluorocarbon gas.