JP2007014880A - Adsorbing sheet, adsorbing element and production method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adsorbing sheet containing a zeolite and an adsorbing element, which are excellent in heat resistance, strength and adsorbing performance. <P>SOLUTION: The adsorbing sheet has the zeolite, a clay mineral fiber with water adsorbing property/ self agglomeration property, a glass fiber and an organic binder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an adsorbing sheet for adsorbing and removing moisture contained in air by an adsorbing material, an adsorbing element, and a method for manufacturing the same.

  Conventionally, an adsorption sheet has been used as means for removing moisture in the atmosphere, and as its configuration, for example, a sheet in which zeolite, organic fibers, and inorganic fibers are mixed is disclosed (for example, Patent Documents). 1).

  Adsorption sheets using zeolite are known in this way, but when using soft organic fibers with a low specific gravity, the zeolite-containing weight ratio contained in the sheet can be improved, and the flexibility and strength of the sheet, etc. However, the heat resistance is inferior, the nonflammability characteristic of zeolite cannot be utilized, and there is a problem that it cannot be applied when the temperature is high.

In addition, when inorganic fibers are used, the use of inorganic materials with a high specific gravity reduces the zeolite-containing weight ratio. In addition, only inorganic materials are flexible and have strong strength and excellent handling properties. This is difficult, and because it contains a small amount of organic matter, it also has a problem that it cannot take advantage of the nonflammability characteristic of zeolite.

On the other hand, in order to take advantage of the nonflammability of zeolite, an inorganic binder is attached to a sheet composed of zeolite, inorganic fibers, and a small amount of organic matter, and the organic matter is baked and removed to obtain a sheet with high heat resistance. The method of obtaining is known.

In this case, a large amount of inorganic binder is required to maintain the strength after firing, and eventually the zeolite-containing weight ratio contained in the sheet is lowered, resulting in a problem that the adsorption performance is deteriorated. Moreover, when there are many organic substances of the sheet | seat before baking, there existed problems, such as the intensity | strength after baking falling.
JP-A-55-62299

  The present invention has been made against the background of the problems of the prior art, and an object of the present invention is to provide an adsorption sheet and an adsorption element containing zeolite that are excellent in heat resistance, strength, and adsorption performance.

As a result of intensive studies to solve the above problems, the present inventors have finally completed the present invention. That is, the present invention comprises (1) an adsorbent sheet comprising zeolite, a water-absorbing and self-consolidating clay mineral fiber, glass fiber, and an organic binder, and (2) the zeolite is Si. / Al molar ratio of 3 to 10 is a zeolite in faujasite county and contains 60 to 85% by weight of the zeolite, (3) moisture adsorbing and self-solidifying The clay mineral fiber having caking properties is a magnesium silicate fiber and / or a calcium silicate fiber having a fiber diameter of 0.1 to 0.5 μm and a fiber length of 1 to 50 μm, and includes 5 to 35% by weight of the clay mineral fiber. The adsorption sheet according to (1) or (2), wherein the glass fiber has a fiber diameter of 1 to 10 μm, a fiber length of 2 mm to 5 mm, and contains 5 to 35% by weight of the glass fiber. Special And (5) the organic binder is at least one polymer selected from a PVA binder, a polyacrylonitrile polymer, a polyethylene polymer, and a polyester polymer. The adsorbing sheet according to any one of (1) to (4), comprising 5 to 15% by weight of the organic binder, (6)
The adsorbent sheet according to any one of (1) to (5), and the adsorbent according to any one of (7) (1) to (6), which is baked at a temperature of 400 to 800 ° C. for 30 minutes or more. Adsorption element characterized in that the sheet is formed into a honeycomb structure, (8) Honeycomb with sheet containing zeolite, clay mineral fiber having moisture adsorbability and self-consolidation property, glass fiber, and organic binder A method for producing an adsorbing element, which is formed by molding a shaped structure and then calcined at a temperature of 400 to 800 ° C. for 30 minutes or more. (9) Zeolite and clay mineral having moisture adsorbing property and self-consolidating property A honeycomb-like structure is formed from a sheet containing fibers, glass fibers, and an organic binder, and then an inorganic adhesive is attached, and is fired at a temperature of 400 to 800 ° C. for 30 minutes or more. Method for producing a suction element, characterized in Rukoto is.

  The adsorbing sheet and adsorbing element of the present invention exhibit excellent performance in all aspects, including heat resistance, strength and adsorbability, so the use is expanded, and the sheet has a high zeolite content and high density. Therefore, it is possible to save the space by satisfying the user's request with a small amount, and while exhibiting excellent adsorption performance, it is possible to desorb the object to be adsorbed by heating. There is an advantage that it is economically advantageous by extending the desorption cycle. Furthermore, even when it is necessary to use at a very high temperature of 500 to 800 ° C., there is an advantage that it can be used with almost no loss of adsorption characteristics.

Hereinafter, the present invention will be described in detail.
In order to solve the above-mentioned problems, the present inventor has intensively studied by paying attention to the kind and physical properties of the skeleton material applied to the adsorption sheet, the adsorption element, and the manufacturing method thereof.

As a result, an adsorbing sheet with excellent heat resistance, strength, and adsorptivity is provided by using an adsorbing sheet containing zeolite, clay mineral fibers having moisture adsorbing properties and self-consolidating properties, glass fibers, and organic binders. Found that you can.

That is, by using a clay mineral fiber having moisture adsorptivity and self-consolidating property as a skeleton material, the zeolite carrying property on the sheet is excellent, and the skeleton material itself also expresses moisture adsorption characteristics, improving the adsorption performance, Furthermore, it has been found that the strength after firing is remarkably excellent due to self-consolidation.

  The clay mineral fiber having moisture adsorbing property and self-consolidating property used in the adsorbing sheet of the present invention has a fine pore diameter capable of adsorbing moisture, and the moisture adsorbing rate is 5 wt% or more even at 30 ° C. and 60 RH%. Preferably there is. More preferably, it is 7 wt% or more, More preferably, it is 10 wt% or more. Further, it is preferably a clay mineral fiber having a self-consolidating property that dehydrates when heated at a high temperature and becomes a ceramic and exhibits an effect as a binder. Although the kind is not particularly limited, magnesium silicate fiber or calcium silicate fiber is preferable from the viewpoint of performance and strength after firing.

  The present inventors have further found that the strength of the fired sheet can be improved by adjusting the fiber diameter and fiber length of the clay mineral fiber. That is, the fiber diameter of the clay mineral fiber used in the present invention is preferably in the range of 0.1 to 0.5 μm and the fiber length is in the range of 1 to 50 μm, more preferably the fiber diameter is 0.1 to 0.2 μm. The length is 1-30 μm. If the fiber diameter is 0.1 μm or less and the fiber length is 1 μm or less, it is too fine, so the supportability of zeolite on the sheet tends to decrease, and further the strength of the paper tends to decrease. This is because the handleability of the body is lowered.

  When the fiber diameter is 0.5 μm and the fiber length is 50 μm or more, heating for a long time is required at a high temperature when firing. The amount contained in the clay mineral fiber sheet is preferably in the range of 5 to 35% by weight, and more preferably 5 to 25% by weight in view of the content ratio of the adsorbent sheet. If it is less than 5% by weight, the adsorbent carrying ability is insufficient, and if it is 35% or more, there is a disadvantage that the amount of adsorbent used must be reduced.

  The adsorbing sheet of the present invention preferably contains glass fibers. This is based on the finding that it is effective to contain glass fiber when it is necessary to improve the strength and density of the sheet to a higher level. In other words, conventionally, it is essential to use fibrillated pulp fibers such as aramid fibers and ceramic fibers in order to fill the sheet with a large amount of zeolite, and the strength of the sheet is ensured by combining glass single fibers that can improve the strength if necessary. Was. However, the use of bulky pulp fibers increases the sheet thickness, resulting in a low density sheet. Therefore, if clay mineral fibers, which are fine fibers, are used as in the present invention, a sheet can be filled with a large amount of zeolite only in combination with a glass single fiber, the paper thickness is thin, the density is high, and the strength is strong. This is a very advantageous effect in the industry that a sheet can be obtained.

The present inventors have found out that the strength and flexibility are further improved by using glass fibers having a specific fiber length. That is, it is preferable that the fiber diameter of the glass fiber used for the adsorption sheet of this invention is 1-10 micrometers, and it is preferable that a fiber length is 2-5 mm glass fiber.

  The adsorption sheet of the present invention preferably contains an organic binder. This is because the flexibility and strength of the sheet can be improved.

The organic binder used in the adsorbing sheet of the present invention is not particularly limited as long as it can join the adsorbent and the skeleton fiber by the binder effect, but may be a PVA polymer, a polyacrylonitrile polymer, a polyethylene polymer, or a polyester polymer. For example, the inventors of the present application have found that the flexibility and strength before firing can be improved, and the strength after firing can also be improved.

  The amount of the organic binder used in the adsorption sheet of the present invention is preferably in the range of 5 to 15% by weight, and more preferably 5 to 10% by weight in consideration of the content ratio of the adsorbent sheet. If the amount is less than 5% by weight, the adsorbent carrying ability is insufficient, and if it is 15% or more, there is a disadvantage that the amount of adsorbent used must be reduced, and the strength after firing is significantly reduced.

The inventors then studied zeolite. As a result, with regard to zeolite, by specifying the Si / Al molar ratio and the type of zeolite, the moisture absorption / desorption characteristics are high, it can be used at high temperatures, and it has excellent heat resistance without degradation in performance. It has been found that a moisture adsorption sheet can be provided. That is, the zeolite used in the adsorption sheet of the present invention is preferably a faujasite county zeolite having a Si / Al molar ratio of 3-10. This is because, if the Si / Al molar ratio is 3 or less, for example, the use conditions of about 500 to 800 ° C. are possible, and the water adsorption performance of the zeolite decreases in a very short period of time, or the adsorption and desorption are continuously repeated to remove the water. This is based on the knowledge that the desorption property at the time of removal is deteriorated and the moisture adsorption performance at the time of continuous processing is lowered. Further, if the Si / Al molar ratio is 10 or more, the heat resistance can be improved, but the water repellency effect of Si becomes stronger and the water adsorption performance itself of the zeolite is lowered.

Next, in order to increase the weight ratio of the adsorbent contained in the sheet, an adsorbent having a high specific gravity is preferable. The form of zeolite is preferably in the form of powder, and the particle diameter is preferably in the range of 0.1 to 10.0 μm in average particle diameter. The range is 2.0 to 8.0 μm.

  The amount of zeolite used in the adsorption sheet of the present invention is preferably in the range of 60 to 85% by weight, and more preferably 75 to 80% by weight in consideration of adsorption performance, adsorbent dropout, and sheet strength. The reason is that if the amount is less than 60% by weight, sufficient adsorption performance cannot be obtained, and if it exceeds 85% by weight, the amount of adsorbed drops increases and the strength of the sheet is remarkably lowered.

  The thickness of the adsorption sheet of the present invention is preferably in the range of 0.1 to 0.5 mm, more preferably in the range of 0.1 to 0.3 mm. If the thickness is 0.1 mm or less, the strength of the sheet is remarkably lowered and the formability of the sheet is deteriorated. In addition, the sheet cannot be processed into an adsorbing element such as a honeycomb in post-processing. This is because the pressure loss of the adsorbing element obtained by processing the honeycomb into a honeycomb shape or the like increases.

The basis weight of the adsorption sheet of the present invention is in the range of 25 to 200 g / m ² , and desirably in the range of 40 to 150 g / m ² . If the basis weight is 25 g / m ² or less, the paper thickness becomes thin, the strength of the sheet is remarkably lowered, the formability of the sheet is lowered, and it becomes impossible to process into an adsorbing element such as a honeycomb shape in the post-processing. This is because the paper thickness increases and the pressure loss of the adsorbing element processed into a honeycomb shape or the like increases if / m ² or more.

The conditions for firing the adsorption sheet of the present invention are preferably fired at a temperature of 400 to 800 ° C. for 30 minutes or more. More preferably, it is 550-700 degreeC. This is because the organic binder is removed by firing, and the clay mineral fiber is self-solidifying and curing temperature. If the temperature is 400 ° C. or higher, sufficient organic matter removal and self-consolidation of clay mineral fibers may not be achieved. If the temperature is 800 ° C. or higher, the crystal structure of the zeolite itself is destroyed. There is no particular upper limit for the firing time, but even if the firing is performed for 100 hours or more, the effect is hardly changed, which is economically disadvantageous.

  The honeycomb structure which is the structure of the adsorption element of the present invention is preferably a honeycomb structure formed in a columnar shape or a cylindrical shape. The columnar shape refers to a shape in which a honeycomb is wound around a core material (FIG. 1), and the cylindrical shape is a stack of honeycombs so that gas passes in parallel, and the processing gas starts from the center. This refers to a shape in which the honeycomb laminated body is arranged on the circumference so as to be ventilated in the radial direction (FIG. 2). Adsorption zones and regeneration zones are provided in these cylindrical and cylindrical shapes and rotated around the central axis, so that the adsorption and regeneration processes can be performed efficiently and continuously. The honeycomb shape is superior to the felt shape and granular shape in terms of prevention of clogging due to mist and dust, low pressure loss, and weight reduction.

  The method for producing an adsorbing element of the present invention comprises forming a sheet containing zeolite, moisture adsorbing and self-consolidating clay mineral fibers and an organic binder, and then forming the sheet into a honeycomb structure. It is desirable to produce the adsorbing element by baking it at a temperature of 400 to 800 ° C. for 30 minutes or longer. If necessary, an inorganic binder can be added to the adsorbing element before baking for improving the strength. The inorganic binder includes silica sol and phosphate, but is not particularly limited.

EXAMPLES Next, although this invention is demonstrated concretely using an Example and a comparative example, this invention is not limited to these.
In addition, the measuring method of the various characteristics of the adsorption sheet in this invention is as follows.

(1) Measuring method of content weight ratio G of adsorbent contained in adsorbing sheet G (% by weight) = (a / A) × 100
Where a is the adsorption rate (% by weight) of the adsorbent sheet
A is the adsorption rate of the adsorbent alone (wt%)

(2) Measurement of adsorption rate of adsorption sheet: (According to JIS-K-1474)
The adsorption element is placed in the U-tube for adsorption test and the moisture vapor adsorption test device (Fig. 3) adjusted to a temperature of 30 ° C ± 0.5 ° C is flowed with 60RH% of relative humidity and adsorbed for 60 minutes to increase the weight of the adsorption element. Measure. The adsorption rate q is obtained by the following equation.
q (% by weight) = P / S × 100
Where P is the increase in the adsorption sheet (g)
S is the mass of the adsorption sheet (g)

(3) Measuring method of tensile strength It measured according to JISP-8113 "Paper and paperboard-Testing method of tensile properties". The width of the sheet was 20 mm.
(4) Heat resistance evaluation method After heating the sheet at 700 ° C. in air for 24 hours, (2) Measuring the adsorption rate of the adsorption sheet, and judging the heat resistance by looking at the difference in adsorption rate before heating did.

[Example 1]
70% by weight of zeolite Y having a Si / Al molar ratio of 5 as zeolite, 10% by weight of magnesium silicate fiber having a fiber diameter of 0.1 μm and a fiber length of 1 μm as clay mineral fiber, and a fiber diameter of 6 μm as glass fiber A wet papermaking machine with a weight of 10% by weight of PVA (VPB-1-5-2, manufactured by Kuraray Co., Ltd.) using 10% by weight of 3 mm glass fiber and an organic binder at a basis weight of 70 g / m ^2. A use sheet was created. As a result of measuring the moisture adsorption rate of this sheet according to JIS-K-1474, an excellent result of 18% by weight was obtained under the conditions of an adsorption temperature of 30 ° C. and a relative humidity of 60 RH%. Further, the tensile strength of the sheet was as strong as 2.8 kgf / 20 mm, and the sheet was excellent in flexibility. Next, 10% by weight of silica sol was attached to this sheet, and the tensile strength of the sheet after firing at 550 ° C. for 3 hours was measured. As a result, a strong result of 1.4 kgf / 20 mm was obtained. In addition, the water absorption after heating at 700 ° C. for 24 hours did not decrease and was good. This sheet had a high moisture adsorption rate and a heat resistance of 550 ° C. or higher, and was excellent in both performance and heat resistance.

[Example 2]
70% by weight of Y-type zeolite having a Si / Al molar ratio of 5 as zeolite, 10% by weight of magnesium silicate fiber having a fiber diameter of 0.2 μm and a fiber length of 30 μm as clay mineral fiber, and a fiber diameter of 6 μm as glass fiber A wet papermaking machine with a weight of 10% by weight of PVA (VPB-1-5-2, manufactured by Kuraray Co., Ltd.) using 10% by weight of 3 mm glass fiber and an organic binder at a basis weight of 70 g / m ^2. A use sheet was created. As a result of measuring the moisture adsorption rate of this sheet according to JIS-K-1474, an excellent result of 18% by weight was obtained under the conditions of an adsorption temperature of 30 ° C. and a relative humidity of 60 RH%. Further, the tensile strength of the sheet was as strong as 2.8 kgf / 20 mm, and the sheet was excellent in flexibility. Next, 10% by weight of silica sol was attached to this sheet, and the tensile strength of the sheet after calcination at 550 ° C. for 3 hours was measured. As a result, a strong result of 1.3 kgf / 20 mm was obtained. In addition, the water absorption after heating at 700 ° C. for 24 hours did not decrease and was good. This sheet has a high moisture adsorption rate and a heat resistance of 550 ° C. or higher, and has excellent characteristics in both performance and heat resistance.

[Example 3]
70% by weight of Y-zeolite having a Si / Al molar ratio of 10 as zeolite, 10% by weight of magnesium silicate fiber having a fiber diameter of 0.1 μm and a fiber length of 1 μm as clay mineral fiber, and a fiber diameter of 6 μm as glass fiber A wet papermaking machine with a weight of 10% by weight of PVA (VPB-1-5-2, manufactured by Kuraray Co., Ltd.) using 10% by weight of 3 mm glass fiber and an organic binder at a basis weight of 70 g / m ^2. A use sheet was created. As a result of measuring the moisture adsorption rate of this sheet according to JIS-K-1474, an excellent result of 15% by weight was obtained under the conditions of an adsorption temperature of 30 ° C. and a relative humidity of 60 RH%. Further, the tensile strength of the sheet was as strong as 2.8 kgf / 20 mm, and the sheet was excellent in flexibility. Next, 10% by weight of silica sol was attached to this sheet, and the tensile strength of the sheet after firing at 550 ° C. for 3 hours was measured. As a result, a strong result of 1.4 kgf / 20 mm was obtained. In addition, the water absorption after heating at 700 ° C. for 24 hours did not decrease and was good. This sheet has a high moisture adsorption rate and a heat resistance of 550 ° C. or higher, and has excellent characteristics in both performance and heat resistance.

[Example 4]
70% by weight of zeolite Y having a Si / Al molar ratio of 5 as zeolite, 5% by weight of magnesium silicate fiber having a fiber diameter of 0.1 μm and a fiber length of 1 μm as clay mineral fiber, and a fiber diameter of 6 μm as glass fiber 15% by weight of 3 mm glass fiber and 10% by weight of PVA (VPB-1-5-2 manufactured by Kuraray Co., Ltd.) as an organic binder at a weight of 70 g / m ² basis weight. A use sheet was created. As a result of measuring the moisture adsorption rate of this sheet according to JIS-K-1474, an excellent result of 15% by weight was obtained under the conditions of an adsorption temperature of 30 ° C. and a relative humidity of 60 RH%. Further, the tensile strength of the sheet was as strong as 3.5 kgf / 20 mm, and the sheet was excellent in flexibility. Next, 10% by weight of silica sol was attached to this sheet, and the tensile strength of the sheet was measured after firing at 550 ° C. for 3 hours. As a result, a strong result of 1.6 kgf / 20 mm was obtained. In addition, the water absorption after heating at 700 ° C. for 24 hours did not decrease and was good. This sheet has a high moisture adsorption rate and a heat resistance of 550 ° C. or higher, and has excellent characteristics in both performance and heat resistance.

[Example 5]
70% by weight of Y-type zeolite having a Si / Al molar ratio of 15 as zeolite, 10% by weight of magnesium silicate fiber having a fiber diameter of 0.1 μm and a fiber length of 1 μm as clay mineral fiber, and a fiber diameter of 6 μm as glass fiber A wet papermaking machine with a weight of 10% by weight of PVA (VPB-1-5-2, manufactured by Kuraray Co., Ltd.) using 10% by weight of 3 mm glass fiber and an organic binder at a basis weight of 70 g / m ^2. A use sheet was created. As a result of measuring the moisture adsorption rate of this sheet according to JIS-K-1474, 4% by weight was obtained under the conditions of an adsorption temperature of 30 ° C. and a relative humidity of 60 RH%, which was lower than that of the example. However, the tensile strength of the sheet was as strong as 2.8 kgf / 20 mm by using magnesium silicate fiber and glass fiber, and the result was a sheet having excellent flexibility. Next, 10% by weight of silica sol was attached to this sheet, and the tensile strength of the sheet after firing at 550 ° C. for 3 hours was measured. As a result, a strong result of 1.4 kgf / 20 mm was obtained. However, the water absorption after heating at 700 ° C. for 24 hours did not decrease and was good, but it was as low as 4% by weight from the beginning. Since this sheet had a high Si / Al molar ratio of zeolite, the moisture adsorption rate was lower than those of Examples 1 to 4.

[Comparative Example 1]
As zeolite, 70% by weight of A-type zeolite having a Si / Al molar ratio of 1.5 and 10% by weight of magnesium silicate fiber having a fiber diameter of 0.1 μm and a fiber length of 1 μm as clay mineral fibers and glass fiber having a fiber diameter of 10% by weight. Wet paper making at a weight ratio of 10% by weight of PVA (VPB-1-5-2 made by Kuraray Co., Ltd.) with 10% by weight of 6 μm × 3 mm glass fiber and an organic binder at a basis weight of 70 g / m ² A sheet was created using the device. As a result of measuring the moisture adsorption rate of this sheet according to JIS-K-1474, 12% by weight was obtained under the conditions of an adsorption temperature of 30 ° C. and a relative humidity of 60 RH%, which was lower than that of the example. However, the tensile strength of the sheet was as strong as 2.8 kgf / 20 mm by using magnesium silicate fiber and glass fiber, and the result was a sheet having excellent flexibility. Next, 10% by weight of silica sol was attached to this sheet, and the tensile strength of the sheet after firing at 550 ° C. for 3 hours was measured. As a result, a strong result of 1.4 kgf / 20 mm was obtained. However, the water absorption after the heating at 700 ° C. for 24 hours was drastically decreased, and the water absorption decreased to 1.0 wt%. Since this sheet uses A-type zeolite having a low Si / Al molar ratio of zeolite, the moisture adsorption rate is lower than that of the example, and the heat resistance is low.

[Comparative Example 2]
70% by weight of zeolite Y having a Si / Al molar ratio of 5 as zeolite, 10% by weight of aluminum borate fiber having a fiber diameter of 0.1 μm and a fiber length of 1 μm as clay mineral fiber, and a fiber diameter of 6 μm as glass fiber A wet papermaking machine with a weight of 10% by weight of PVA (VPB-1-5-2, manufactured by Kuraray Co., Ltd.) using 10% by weight of 3 mm glass fiber and an organic binder at a basis weight of 70 g / m ^2. A use sheet was created. As a result of measuring the moisture adsorption rate of this sheet according to JIS-K-1474, an excellent result of 18% by weight was obtained under the conditions of an adsorption temperature of 30 ° C. and a relative humidity of 60 RH%. Moreover, the tensile strength of the sheet | seat was as strong as 2.8 kgf / 20mm by using glass fiber, and the result which was a sheet | seat excellent in the softness | flexibility was obtained. Next, as a result of measuring the tensile strength of the sheet after attaching 10% by weight of silica sol to this sheet and calcining at 550 ° C. for 3 hours, 0.5 kgf was obtained because no clay mineral fiber having self-consolidating property was used. / 20 mm, which is a result of lower strength than the example. Good results were obtained with no decrease in water absorption after heating at 700 ° C. for 24 hours. Although this sheet can be excellent in performance, the strength after firing is weak because it does not use self-consolidating clay mineral fibers, and heat resistance cannot be expressed.

[Comparative Example 3]
70% by weight of Y-type zeolite having a Si / Al molar ratio of 5 as zeolite, 10% by weight of magnesium silicate fiber having a fiber diameter of 0.1 μm and a fiber length of 1 μm, and 10% by weight of ceramic fiber as clay mineral fiber A sheet was prepared using a wet papermaking machine with PVA (VPB-1-5-2 manufactured by Kuraray Co., Ltd.) as a binder at a weight of 10% by weight and a basis weight of 70 g / m ² . As a result of measuring the moisture adsorption rate of this sheet according to JIS-K-1474, an excellent result of 18% by weight was obtained under the conditions of an adsorption temperature of 30 ° C. and a relative humidity of 60 RH%. However, since the glass fiber was not used, the tensile strength of the sheet was 1.5 kgf / 20 mm, which was lower than that of the example. Next, 10% by weight of silica sol was attached to this sheet, and the tensile strength of the sheet after firing at 550 ° C. for 3 hours was measured. As a result, 0.7 kgf / 20 mm was obtained, which was lower in strength than the example. Good results were obtained with no decrease in water absorption after heating at 700 ° C. for 24 hours. Although this sheet can be excellent in performance, the strength before and after firing is weak because glass single fibers are not used.

[Comparative Example 4]
70% by weight of zeolite Y having a Si / Al molar ratio of 5 as zeolite, 10% by weight of magnesium silicate fiber having a fiber diameter of 0.1 μm and a fiber length of 1 μm as clay mineral fiber, and a fiber diameter of 6 μm as glass fiber A wet papermaking machine with a weight of 10% by weight of PVA (VPB-1-5-2, manufactured by Kuraray Co., Ltd.) using 10% by weight of 3 mm glass fiber and an organic binder at a basis weight of 70 g / m ^2. A use sheet was created. As a result of measuring the moisture adsorption rate of this sheet according to JIS-K-1474, an excellent result of 18% by weight was obtained under the conditions of an adsorption temperature of 30 ° C. and a relative humidity of 60 RH%. Moreover, the tensile strength of the sheet | seat was as strong as 2.8 kgf / 20mm by using glass fiber, and the result which was a sheet | seat excellent in the softness | flexibility was obtained. Next, as a result of measuring the tensile strength of the sheet after 10% by weight of silica sol was applied to this sheet and baked at 300 ° C. for 0.5 hour, it was found that no self-consolidating clay mineral fiber was used. .7 kgf / 20 mm, which is a result of lower strength than the example. Good results were obtained with no decrease in water absorption after heating at 700 ° C. for 24 hours. Although this sheet can be excellent in performance, since the firing conditions are not sufficient, the strength after firing is weak and heat resistance cannot be exhibited.

  Various characteristics of the examples and comparative examples are shown in Table 1.

  The adsorbing sheet and adsorbing element of the present invention exhibit excellent performance in all aspects, including heat resistance, strength and adsorbability, so the use is expanded, and the sheet has a high zeolite content and high density. Therefore, it is possible to save the space by satisfying the user's request with a small amount, and while exhibiting excellent adsorption performance, it is possible to desorb the object to be adsorbed by heating. There is an advantage that it is economically advantageous by extending the desorption cycle. Further, even when it is necessary to use at a very high temperature of 500 to 800 ° C., there is an advantage that it can be used without almost losing the adsorption characteristics, and it is greatly contributed to the industry.

The honeycomb-columnar shape which is the shape of the adsorption | suction element of this invention is shown. The honeycomb-cylindrical shape which is the shape of the adsorption | suction element of this invention is shown. The apparatus which evaluates the adsorption | suction performance of the adsorption sheet of this invention is shown.

Explanation of symbols

1: Dry gas inlet 2: Temperature control serpentine tube 3: Gas cleaning with common diafiltration plate 4: Mixing bottle 5: U-tube for adsorption test 6: Three-way cock 7: Gas flow meter for steam generation 8: Flow rate for dilution gas Total 9: Exhaust port 10: Excess gas outlet 11: Thermostatic bath 12: Water 13: Gas flow rate adjustment cock

Claims (9)

An adsorptive sheet comprising zeolite, clay mineral fiber having moisture adsorbing property and self-consolidating property, glass fiber, and an organic binder. 2. The adsorbent sheet according to claim 1, wherein the zeolite has a Si / Al molar ratio of 3 to 10 and is a zeolite of faujasite county and contains 60 to 85 wt% of the zeolite. The clay mineral fiber having moisture adsorbing property and self-consolidating property is a magnesium silicate fiber and / or calcium silicate fiber having a fiber diameter of 0.1 to 0.5 μm and a fiber length of 1 to 50 μm. The adsorbent sheet according to claim 1, comprising 5 to 35% by weight. The adsorbent sheet according to any one of claims 1 to 3, wherein the glass fiber has a fiber diameter of 1 to 10 µm, a fiber length of 2 mm to 5 mm, and 5 to 35 wt% of the glass fiber. The organic binder is at least one polymer selected from a PVA binder, a polyacrylonitrile polymer, a polyethylene polymer, and a polyester polymer, and contains 5 to 15% by weight of the organic binder. 4. The adsorption sheet according to any one of 4 above. The adsorbent sheet according to any one of claims 1 to 5, which is baked at a temperature of 400 to 800 ° C for 30 minutes or more. An adsorption element, wherein the adsorption sheet according to any one of claims 1 to 6 is formed into a honeycomb structure. A honeycomb-like structure is formed from a sheet containing zeolite, moisture-absorbing / self-consolidating clay mineral fiber, glass fiber, and organic binder, and then fired at a temperature of 400 to 800 ° C. for 30 minutes or more. A method for manufacturing an adsorption element. A honeycomb-like structure is formed from a sheet containing zeolite, moisture-absorbing and self-consolidating clay mineral fibers, glass fibers, and an organic binder, and then an inorganic adhesive is attached, and a temperature of 400 to 800 ° C. A method for producing an adsorbing element, characterized by being baked for at least 30 minutes.

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