JPS6328428A - Drying agent - Google Patents

Abstract

PURPOSE:To obtain a drying agent which is easy in handling and free in molding and deformation and high in strength and difficult-to cause a crack at a time for heating and regenerating it and is free from environmental pollution by a liquefied moisture absorbent by sticking moisture absorbent fine particles by polytetrafluoroethylene. CONSTITUTION:A drying agent is obtained by kneading moisture absorbent fine particles such as synthesized zeolite, polytetrafluoroethylene and solvent naphtha, etc., and molding this mixture into a sheet-shape or the like by pressurizing rolls and drying this molded article. Furthermore a moisture absorbent 3 such as lithium chloride is deposited on the moisture absorbent fine particles 1 by absorbing an alcoholic soln. of lithium chloride thereto and drying it and thereby the drying agent bonded by polytetrafluoroethylene 2 is obtained.

Description

Detailed Description of the Invention "Industrial Application Field" This invention is a moisture absorbent that can be molded into various shapes, including pellets and powder, and which absorbs moisture and liquefies it. The present invention relates to a desiccant material that absorbs and retains a large amount of moisture by preventing moisture from leaking into water and making maximum use of the moisture absorption ability of the moisture absorbent.

``Prior Art'' As shown in FIG. 5, conventional desiccant materials are made by using hygroscopic fine particles as they are or by molding them into a pellet-like shape to form a dehumidifying rotor 11 that is permeable to air. I use it in a container such as In many cases, the hygroscopic particles are supplied with humid air to dehumidify them, and some of the hygroscopic particles are supplied with heated regeneration air to regenerate the hygroscopic particles.

Also known is a drying material in which an asbestos cloth or other supporting material holds an absorbent such as lithium chloride or calcium chloride.

``Towards the problem to be solved by the invention'' However, the above-mentioned hygroscopic particles are often used in the form of pellets or powder, which are always difficult to handle, and are rubbed together during use and turn into fluorescein. This has the disadvantage that it scatters and pollutes the environment.

In addition, the higher the moisture absorption capacity of the moisture absorbent, the higher the moisture absorbency, and many of the moisture absorbents themselves liquefy when they absorb moisture (for example, lithium 112 chloride, lithium bromide, calcium chloride, etc.). Even if the hygroscopic agent is sealed in a container such as the dehumidifying rotor 11, it has the disadvantage that it tends to leak out of the system and contaminate the environment by being attached to other equipment or materials. .

This invention aims to provide a desiccant material that eliminates these drawbacks.

``Means for solving the problem'' In other words, in order to solve the above-mentioned deficiencies in the conventional example, the drying material of the present invention first solves the problems as shown in FIG. , hygroscopic fine particles l having the property of adsorbing and retaining moisture are added to polytetrafluoroethylene 2
The hygroscopic fine particles 1 are bound together to form a 1 fM l-1 hollow space 4 of polytetrafluoroethylene 2 around the hygroscopic fine particles 1, and this mesh space 4 is used as a passage for air to pass through to the wood.

Therefore, water is easily supplied to the internal hygroscopic particles, resulting in a high moisture absorption rate.

Secondly, the desiccant material of the present invention has a hygroscopic agent 3 having a property of absorbing moisture and liquefying it, which is held around the hygroscopic fine particles 1, etc., and bound with polytetrafluoroethylene 2. , polytetrafluoroethylene 2 is placed around the moisture absorbent 3.
form a mesh-like space 4, and fill this mesh-like space 4 with water)
Moisture is absorbed by the moisture absorbent 3 as a permeation path for N gas, and the side wall of the mesh space 4 is made into a hydrophobic surface of the polytetrafluoroethylene 2, and the moisture is retained by the surface I tension. This prevents the absorbed moisture absorbent 3 from leaking and makes maximum use of the moisture absorbing ability of the moisture absorbent 3. In other words, even if moisture is absorbed by the moisture absorbent and the moisture absorbent becomes liquid, the 1 mesh 4 is between the mesh and F of the water-repellent polytetrafluoroethylene 2.
It does not leak to the outside.

In this case, the drying material is actually made by binding all hygroscopic particles such as silica gel with polytetrafluoroethylene 2, or by impregnating hygroscopic particles such as silica gel with a hygroscopic agent 3 such as lithium chloride. hand.

This is bound with polytetrafluoroethylene 2, and the beret 7
) or molded or processed into a sheet. When hygroscopic fine particles 1 are bound with polytetrafluoroethylene 2, a large amount of mesh spaces 4 that retain moisture are formed around all the particles of polytetrafluoroethylene 2, so that hygroscopic fine particles (-1 and hygroscopic The effect of Agent 3 can be maximized.

Thirdly, as shown in FIG. 2, if the hygroscopic fine particles 1 are coated with a microporous coating 5 made of water-repellent polytetrafluoroethylene, the liquefied hygroscopic agent (moisture) is retained.

A large amount of moisture can be adsorbed and retained without the moisture absorbent leaking out from the dotted lines 4.

Moreover, the desiccant material in this case contains the desiccant material in the first case, and the coating is a polytetrafluoroethylene porous membrane or a composite porous coating of water-repellent fine particles and polytetrafluoroethylene. Then, the moisture-containing gas passes through the polytetrafluoroethylene porous coating, which has 2 lignophobic properties, and the moisture is absorbed or adsorbed by the hygroscopic fine particles and hygroscopic agent inside, and eventually swells or liquefies, but its hygroscopicity The moisture retained in the fine particles or moisture absorbent is blocked by the hydrophobic polytetrafluoroethylene coating on the outer surface and does not leak to the outside.Since the surface is polytetrafluoroethylene, the moisture absorbent can be pulverized, etc. Without any
Clean dry gas is obtained.

Note that the coating also has the effect of reinforcing the molded desiccant material.

Furthermore, the desiccant material of the present invention can be used by applying unevenness to a sheet-shaped original fabric 6, as shown in the example shown in FIG. 3, and rolling it up. Therefore, it is important to allow air to pass through the water along its length. Further, as shown in the example shown in FIG. 4, the honeycomb structure 7 can be processed into a honeycomb shape and has through holes 8 of a predetermined diameter on the right side, and can be used by passing water vapor through the through holes 8.

"Effects of the Invention" Since the drying material of this invention is configured as described above,
Unlike the conventional pellet-like or powder-like desiccant, it is easy to handle, and while the conventional pellet-like or powder-like desiccant does not have any other features, the desiccant of the present invention can be freely molded or deformed, Since it can take various forms, it can be used for a wide range of purposes.

In addition, it is extremely strong and does not easily crack when used after being heated and regenerated, so it can be used for a long period of time.

Furthermore, it retains liquefied moisture absorbent (moisture). tl
No moisture absorbent leaks from the 11-eye space.

It can adsorb and retain large amounts of moisture without polluting the external environment.

The desiccant of the present invention can be used as a desiccant for conventional dryers, or as a wall material. Moreover, in particular, those containing a moisture absorbent can absorb or release moisture, so they can also be used as materials for humidity control.

Hereinafter, the desiccant material of the present invention will be explained in detail according to Examples.

"Example" Example 1 Synthetic zeolite (Silton B, product name, manufactured by Kizawa Chemical Co., Ltd.): PTFE (D-1 product name, manufactured by Daikin Industries, Ltd.): Solvent naphtha in a ratio of 9:1:20
The mixture was kneaded in the following proportions and formed into a sheet with a predetermined thickness using a pressure roll. This sheet-like material was heated at 280°C for 3 hours,
A sheet with a thickness of 1.5 mm was obtained. This sheet is 125c
Cut into m2 pieces and dry at 150°C. 14. OOg, and this was designated as sample 1. This sample 1 was heated to 21℃ and 30%
When left at RH for 6 hours, it absorbed moisture and became 15.7
It became 5g. Therefore, it can be seen that 1.75 g of water was absorbed.

In addition, 4. LiCl was added to the sample 1 as an alcohol solution.
When 5g was absorbed and dried at 150°C, the amount was 18.56g, which was designated as sample 2. This sample 2 was heated to 21℃ and 30%
When exposed to several liters at RH for 6 hours, it absorbed moisture and became 27.4
0g, and absorbed 8.84g of water. Furthermore, even when a paper was attached to the surface of the sheet, there was no movement of moisture or other substances.

Example 2 Synthetic zeolite (SilLon B trade name, manufactured by Mizusawa Chemical Co., Ltd.): PTFE (D-1 trade name, manufactured by Daikin Industries, Ltd.): Solvent naphtha at 7 = 3.20
The mixture was kneaded at a ratio of 1, and then formed into a sheet with a predetermined thickness using a pressure roll. This sheet-like material was heated at 280°C for 3 hours,
Thickness 0.75m excluding solvent naphtha and surfactant
The sheet of m is (1). This sheet was cut into 125 cm 2 and dried at 130° C. to give a weight of 12 g.

This was impregnated with 1.7 g of LiCI as a moisture absorbent in the form of an alcohol solution. When this was dried at 130° C., 82 g of sample #1 was obtained. This sample
2 poems at 2℃ and 30%RH! ! When it was left to stand, it absorbed 3.35g of water and became 15.15g. At this time, dew condensation does not occur due to the PTFE mesh.

Example 3 Synthetic zeolite (Zeostar NP IQOP, trade name, manufactured by Nihon Kagaku Kogyo Co., Ltd.): PTFE (D-1
Product name Daikin Industries, Ltd.! A): Solvent naphtha was kneaded in a ratio of 9:1:20 and formed into a sheet of a predetermined thickness using a pressure roll. This sheet-like material was heated to 280°C.
The mixture was heated for 3 hours to obtain a sheet with a thickness of 1.4 mm. This sheet was cut into 100 cm 2 pieces and dried at 150° C. to give a weight of 14.28 g. This sample was heated at 25℃ and 43%R.
When I left it in room H for 3 hours, it weighed 16.76g.
Absorbed 2.48g of water.

Example 4 Synthetic zeolite (Zeostar NP LOOP, trade name: Hiki Chemical Industry Co., Ltd.: V): PTFE (D-
1 (trade name, manufactured by Daikin Industries, Ltd.): Solvent naphtha was kneaded in a ratio of 9.5:0.5:20 and formed into a sheet of a predetermined thickness using one pressure roll. This sheet-like material was heated at 280° C. for 3 hours to obtain a sheet with a diameter of 11.3 mm. Cut this sheet into 100cm2 pieces and heat at 150°C.
When dried, the weight was 12.04 g. This sample was heated at 25°C.
, when placed in a room with 40% RH for 2 hours, the result was 14.35
g, and absorbed 2.31 g of water.

Example 5 Silica gel (Mizukasil P73, trade name, manufactured by Mizusawa Chemical Co., Ltd.): PTFE (D-1, trade name, manufactured by Daikin Industries, Ltd.): Solvent naphtha were kneaded in a ratio of 7.3:20, and the mixture was mixed with a pressure roll to a predetermined level. It was formed into a thick sheet. This sheet-like material was heated at 280°C for 3 hours, and the thickness was 2
．． A sheet of 0 mm was obtained. This sheet is 125cm2!
1/] and soaked with 4.5 g of an alcohol solution of LiC1. When this is dried at 100℃, it weighs 21.56g.
It became. When this sample was left in a room at 22°C and 32% RH for 3 hours, it absorbed 9.00g of water and 30.5g of water was absorbed.
It became 6g. No water droplets were observed on the surface of this sample.

Example 6 Synthetic zeolite) (TSZ640, trade name, manufactured by Toyo Soda Co., Ltd.): PTFE fine powder (Polyflon Fine Powder, trade name, manufactured by Daikin Industries, Ltd.) were mixed in a mixer at a ratio of 6.5:3.5, and this The powder was pressed at 380℃ and 200kg/cm2, and
cm2. A plate with a thickness of 2°0 mm was obtained. An alcoholic solution of LiC1 was applied to this plate as a moisture absorbent. It was soaked with Og. When this was dried at 100° C., the weight was 34.69 g. When this sample was left in a room at 21°C and 30% RH for 5 hours, it absorbed water and weighed 40.72g, which was 6.03g.
Absorbed g of water. This sample was strong, and by press molding, a honeycomb-like or other suitable dehumidifying plate structure was obtained as required.

Example 7 Acetylene black: PTFE (D-1 product name Daikin Industries, Ltd.!W): Solvent naphtha 6:4
:20 and then formed into a sheet of a predetermined thickness using a pressure roll. This sheet-like material was heated at 280° C. for 3 hours to obtain a sheet with a thickness of 0.85 mm. A 160 cm 2 piece of this sheet was cut out, and 1.0 g of a methanol solution of LiC1 was impregnated therein as a moisture absorbent. When this was heated and dried at 100° C. for 20 minutes, the weight was 5.20 g. When this sample was strained in a room at 22°C and 32% RH for several hours,
8.08[, and absorbed 1.92g of water.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the desiccant material of the present invention, FIG. 2 is a sectional view showing another embodiment, and FIGS.
The figure is a perspective view of a molded article formed using the desiccant material of the present invention, and FIG. 5 is a schematic diagram showing the state in which the conventional desiccant material is used. 1... Hygroscopic a particles 2... Polytetrafluoroethylene 3... Hygroscopic agent 4..., IM [1 between blanks 5... Water repellent coating No. 5 Eye 1 Figure 2 Figure 3 Figure 4th ward

Claims (1)

[Scope of Claims] 1. A drying material characterized in that hygroscopic fine particles are bound with polytetrafluoroethylene. 2. The drying material according to claim 1, wherein the hygroscopic fine particles are formed by supporting a hygroscopic agent on a supporting member. 3. The desiccant material according to claim 2, wherein the hygroscopic fine particles are formed by binding hydrophilic fine particles with polytetrafluoroethylene and carrying a hygroscopic agent thereon. 4. Any one of claims 1 to 3, characterized in that the hygroscopic fine particles are coated with a polytetrafluoroethylene porous coating or a water-repellent polytetrafluoroethylene composite porous coating. Dried material listed in Crab.