JP2006205122A - Molded body for dehumidification and composite molded body for dehumidification - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molded body for dehumidification and a composite molded body for dehumidification which are highly efficient, easily manufacturable, and very suitable for the dehumidifier rotors by improving various properties of the conventional dehumidifier rotors. <P>SOLUTION: The molded body for the dehumidification is molded by binding an absorbent with a latex series adhesive, and the composite molded body for the dehumidification wherein a heat exchanger is included in the molded body for the dehumidification is provided. The absorbent is preferably zeolite, porous silica, or porous carbon, and further, is preferably the one which is water-repellent. A particle diameter of the latex series adhesive is preferably 0.05-0.2 μm, and further, the latex series adhesive is preferably a latex of an acrylic series polymer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is for dehumidification used in a humidity control device that absorbs moisture in the air or, conversely, releases moisture that has been absorbed and humidifies, specifically, a dehumidifying rotor of a desiccant air conditioner or a hybrid desiccant air conditioner. The present invention relates to a molded body and a composite molded body for dehumidification.

An air dehumidifying / humidifying system using a humidity control apparatus having a dehumidifying and humidifying function used for a dehumidifier, a humidifier, a hybrid desiccant air conditioner, and the like will be described.
As shown in FIG. 5, a humidity exchanger (hereinafter referred to as a dehumidifying rotor) 4 is rotated through a rotating shaft 6 by a drive motor (not shown). Humid air A1 is blown into the moisture absorption zone 3 of the dehumidifying rotor 4 through the pipe 2 by the blower 1, moisture is adsorbed by the hygroscopic agent and dehumidified, and the dried air A2 is discharged indoors or outdoors through the pipe 5. On the other hand, the regeneration air A3 heated to high temperature by the regeneration heater 8 is sent to the regeneration zone 9 through the pipe 7 to the dehumidification rotor 4, and the moisture absorbent that has adsorbed moisture is heated to take out the moisture, thereby regenerating the moisture absorbent. Then, the humidified air A4 is sucked by the blower 11 through the pipe 10 and is discharged indoors or outdoors.

  Here, the dehumidifying zone 3 for adsorbing moisture to the hygroscopic agent is a position where the moist air A1 blows into the rotating dehumidifying rotor 4, and the hygroscopic agent adsorbing the moisture is heated to discharge the moisture. The regeneration zone 9 that is regenerated by causing the regeneration air 9 to blow is the position at which the regeneration air A3 is blown into the dehumidifying rotor 4 that is rotating similarly. In the moisture absorption zone 3 and the regeneration zone 9, the dehumidification rotor 4 is not particularly divided. Therefore, the dehumidification rotor 4 can be repeatedly used continuously, and dehumidification and humidification can be performed using this.

As shown in FIG. 6, the dehumidifying rotor 4 used in the above system has a moisture absorbent such as zeolite on the surface of a belt-like flat sheet 12 in which a moisture absorbent such as zeolite is impregnated and supported on a belt-like substrate such as corrugated paper. Is formed by winding a corrugated sheet 13 formed by corrugating a belt-like base material impregnated and supported by a corrugated sheet 13 having a height of about 1 to 3 mm into a rotor. In some cases, a roll-shaped rotor is prepared in advance and then impregnated with a hygroscopic agent.
In producing a dehumidifying rotor, a method of soaking in water glass and then transforming to silica gel by acid treatment, or soaking in silica sol and then transforming to silica gel by drying has been proposed. In addition, a method has been proposed in which a hygroscopic agent such as zeolite is adhered to a substrate using an inorganic adhesive such as water glass, colloidal silica, or colloidal alumina (see, for example, Patent Documents 1 to 4).

Japanese Patent Publication No. 1-2614 JP 2000-61250 A JP 2000-70659 A JP 2000-126541 A

The conventional dehumidification rotor has the following problems.
1) The manufacturing process is complicated, yield is poor, and expensive. 2) When an inorganic adhesive is used, the surface of the hygroscopic agent is coated, the effective surface area of the hygroscopic agent is reduced, and the dehumidifying efficiency is lowered. 3) The mechanical strength of both end faces of the dehumidification rotor is weak, and the hygroscopic particles fall off from both end faces. 4) The adhesive strength of inorganic adhesives is weak, and moisture absorbent particles may scatter during use, resulting in environmental problems. 5) The pressure loss of the dehumidification rotor is large.

  An object of the present invention is to improve the various problems of the conventional dehumidification rotor and provide a dehumidification molded body and a dehumidification composite molded body suitable for a dehumidification rotor that can be easily manufactured with high performance.

According to the present invention, there is provided a dehumidified molded article obtained by binding and molding a hygroscopic agent using a latex adhesive.
The hygroscopic agent is preferably zeolite, porous silica or porous carbon. The hygroscopic agent is preferably water-repellent.
The latex particle size of the latex adhesive is preferably 0.05 to 0.2 μm. The latex adhesive is preferably an acrylic polymer latex.
Moreover, it is preferable that the molded body for dehumidification of this invention is reinforced with an aggregate or an outer frame material, and it is more preferable that the said aggregate or an outer frame material is comprised with a porous foil strip.
According to the second aspect of the present invention, there is provided a dehumidifying composite molded body comprising a heat exchanger included in the dehumidifying molded body.
The heat exchanger is preferably composed of a heat pipe, a heat exchange fin, or a heat pump.

  ADVANTAGE OF THE INVENTION According to this invention, the molded object for dehumidification suitable for a dehumidification rotor with easy manufacture, high intensity | strength and the filling rate of a hygroscopic agent, excellent dehumidification capability, and a small pressure loss is provided. Further, according to the present invention, there is provided a dehumidifying composite molded body in which a heat exchanger is integrated with the dehumidifying molded body, and the dehumidifying composite molded body has a direct contact between the heat exchanger and the hygroscopic agent. High efficiency and quick heat exchange are possible.

(First embodiment)
The molded body for dehumidification of the present invention is formed by binding a hygroscopic agent using a latex adhesive.

  The hygroscopic agent used in the present invention is not particularly limited as long as it has a moisture absorbing / releasing function, and zeolite, porous silica, porous carbon and the like can be used. The zeolite may be a synthetic zeolite or a natural zeolite. Among these, porous silica can be preferably used. These hygroscopic agents can be used alone or in combination of several kinds at an appropriate ratio depending on the purpose of use.

As the porous silica, dehumidification silica (A type silica) and humidity control silica (B type silica) are commercially available, but A type silica can be more preferably used as the moisture absorbent. Hereinafter, the present invention will be described in detail by referring to A type silica as hygroscopic silica.
The silica for the hygroscopic agent has a specific surface area of 500 to 600 m ² / g and is a fine particle of ^{2 to 5} nm at the time of synthesis, but is practically commercially available in the form of secondary aggregated particles of about 1 to 4 mm. Yes.

FIG. 1 shows the basic structure of a dehumidified molded article of the present invention using porous silica as a hygroscopic agent. C is the primary particle of silica and D is the secondary aggregated particle. The latex adhesive E is interspersed at the particle interface of the secondary agglomerated particles D and binds the particles at the hygroscopic particle interface.
When water glass or the like is used for the adhesive, a considerable proportion of the surface area of the hygroscopic agent cannot be used as the hygroscopic agent. On the other hand, the molded article of the present invention has a latex adhesive mainly on the particle interface of the hygroscopic particles. Since the agent is interspersed in the form of dots and binds the particles to each other at the particle interface, the use efficiency of the moisture absorbent on the surface of the moisture absorbent is excellent.

  As the moisture absorbent, it is preferable to use a water repellent processed with a water repellent such as a silicone resin or a fluorine resin. By using a water-absorbing moisture-absorbing agent, it is difficult for the latex adhesive and its medium to enter the pores of the moisture-absorbing agent, and an effective surface area can be secured. Furthermore, water vapor can be selectively adsorbed while preventing absorption of liquid water.

Latex adhesives used in the present invention include, for example, conjugated dienes, ethylenically unsaturated carboxylic acid esters, ethylenically unsaturated carboxylic acids, aromatic vinyl compounds, α-olefins, α, β-unsaturated nitrile compounds. A latex in which a homopolymer or copolymer of a monomer such as is dispersed in water in the form of particles.
Among them, latex of acrylic polymer mainly composed of ethylenically unsaturated carboxylic acid ester monomer unit such as acrylate ester; diene polymer mainly composed of conjugated diene monomer unit such as butadiene and isoprene From the viewpoint of excellent heat resistance and water resistance, an acrylic polymer latex can be more preferably used.

  The glass transition temperature of the polymer is preferably -40 ° C to 80 ° C. When the glass transition temperature is within this range, the binding property and the shape retention of the resulting dehumidified molded article are excellent.

  The latex adhesive used in the present invention is preferably produced by emulsion polymerization. By controlling the reaction during emulsion polymerization, the particle size of the latex can be arbitrarily controlled. The particle diameter is preferably 0.05 to 0.2 μm. When the particle diameter is within this range, the binding property is excellent and the dehumidifying efficiency is not significantly reduced by the adhesive covering the surface of the hygroscopic agent or adsorbing to the pores. Here, the particle diameter is a number average particle diameter calculated as an arithmetic average value by measuring the diameter of 100 randomly selected polymer particles using a transmission electron micrograph.

  An anti-aging agent, an antiseptic, an antibacterial agent, a dispersant, and the like may be appropriately added to the latex adhesive used in the present invention, if necessary.

A production process diagram of the dehumidified molded body is shown in FIG.
FIG. 2A is a basic manufacturing process diagram. FIG. 2 (b) shows a process for producing a molding rubber mold made of a silicone resin having excellent flexibility or a fluorine resin having excellent releasability. (C) of FIG. 2 is a manufacturing process diagram of an aggregate, an outer frame material, or an exterior frame material.

First, (a) of FIG. 2 will be described.
Water repellent processing (2) is performed on the surface of the hygroscopic agent (1) such as zeolite, silica and porous carbon using a water repellent, and the excess water repellent is filtered and dried (3). The granulation step (4) is necessary for use in a large-sized dehumidifier as used in a plant, but this step can be omitted.
Next, a latex adhesive is added (5), mixing and kneading step (6) is performed, and the excess latex adhesive is removed by filtration or the like to adhere the adhesive to the surface of the hygroscopic agent. The amount of the adhesive adhered to the hygroscopic agent can be appropriately adjusted by changing the solid content concentration of the latex adhesive used. In the present invention, since a high binding strength can be obtained with a small amount of adhesive, the amount of the adhesive attached to the hygroscopic agent is preferably 10% by weight or less, more preferably 5% by weight with respect to the hygroscopic agent. It is as follows. The lower limit is 0.05% by weight, preferably 0.1% by weight, based on the hygroscopic agent. The solid content concentration of the latex adhesive is usually 5 to 70% by weight, preferably 10 to 50% by weight.

Next, depending on the purpose, the adhesive is attached using a molding die comprising the aggregate, outer frame material, etc. (32) prepared in the steps (b) and (c) and the molding rubber die (24). The formed moisture absorbent is filled into the mold and pressed (7) by pressing as necessary. Depending on the type of adhesive, viscosity, and releasability, a release material such as a nonwoven fabric or release paper can be used.
Next, it is preheated at 120 to 150 ° C. for 30 to 60 minutes to be semi-cured (8) and released from the mold (9). Thereafter, simple deburring and the like are performed, and after adjusting the outer shape, it is further cured at 130 to 180 ° C. for about 0.5 to 1 hour and completely cured (10) to obtain a dehumidified molded body. If necessary, product inspection (11) is performed to complete the product (12). In the step (a) of FIG. 2, steps (4) and (8) can be omitted.

Reinforcing materials such as aggregates and outer frame materials used in the present invention will be described with reference to the cross-sectional view of the dehumidified molded body in FIG.
Depending on the shape, size, and usage environment of the dehumidified molded body, the structure shown in FIGS. 3F to 3H is used. (F) of FIG. 3 has a structure in which a wire mesh 41 is embedded as a reinforcing material inside a molded body 40 of a hygroscopic agent. FIG. 3G shows a structure in which the outer peripheral portion is reinforced with an outer frame member 42 made of a wire mesh. FIG. 3 (h) has a structure in which the entire outer peripheral portion is reinforced with an outer frame member 42 made of a wire mesh.
The dehumidified molded article of the present invention does not require a reinforcing material particularly in the size of a palm of about 10 cm ² . However, when used as a dehumidifying rotor, the size is about 300 to 320 mmφ × 20 mm (thickness), the dehumidifying rotor itself is rotated, and a long-term durability of about 10 to 15 years is required. As shown in (f) to (h), it is preferable to reinforce the dehumidified molded body with a wire mesh 41 or an outer frame member 42. In addition, when used in an apparatus such as a large building plant, the size of the dehumidified molded body reaches 1 to ² m ² , and cannot be transported by human power, so that it can be transported by machine. Thus, as shown in FIG. 3 (h), it is preferable to form an outer frame material made of a wire mesh and fill it with a hygroscopic agent.
The material of the reinforcing material can be appropriately selected from the viewpoint of chemical resistance, corrosion resistance, durability strength, workability, environmental consideration, and cost. Specifically, metals such as various stainless steels and alloys; resins such as olefin polymers can be preferably used. As the reinforcing material, a porous foil strip made of resin or metal is preferably used, and among these, a wire mesh, a lath wire mesh, or a punching metal can be more preferably used.

(Second Embodiment)
In conventional dehumidifying molded articles, it has been almost impossible to integrate the hygroscopic agent and the heat exchanger. However, according to the present invention, it is possible to provide a dehumidifying composite molded body in which a heat exchanger is included in the dehumidifying molded body.
The basic production process of the dehumidifying composite molded body of the present invention is the same as that shown in FIG. 2, but in the molding process (7) of FIG. 2, various heat exchangers such as heat pipes, heat exchange fins and heat pumps are used for dehumidification. The difference is that it is embedded in the molded body. Since the heat exchanger and the hygroscopic agent are in direct contact with each other, the composite molded body for dehumidification of the present invention is highly efficient and can exchange heat quickly.

The dehumidifying composite molded body will be described with reference to FIG.
(I) of FIG. 4 has a structure in which a wire mesh 41 and a heat exchanger 43 as a reinforcing material are embedded. 4 (j) and 4 (k) have a structure in which the heat exchanger 43 is embedded and a part or the whole of the outer peripheral portion thereof is reinforced by the outer frame member 42. FIG.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples and comparative examples, but the present invention is not limited to these examples.

Example 1
Based on the first embodiment of the present invention, a dehumidifying rotor having a diameter of 320 mm and a thickness of 20 mm having the structure shown in FIG.
A stainless steel wire mesh was used as the reinforcing material.
As the latex adhesive, latex having a solid content concentration of 20% by weight of an acrylic polymer mainly composed of 2-ethylhexyl acrylate monomer unit was used. This polymer has a glass transition temperature of 40 ° C. and a particle size of 0.15 μm.
Hygroscopic agent is water repellent by dipping synthetic silica (Fuji silica gel A type: manufactured by Fuji Silysia Chemical Co., Ltd.) with an average particle size of 1.3 mm in methyl hydrogen silicone oil (TSF484: manufactured by GE Toshiba Silicone Co., Ltd.) and drying. processed. After mixing 2000 g of a water-repellent hygroscopic agent and 100 g of the latex adhesive with a solid content of 20%, excess latex adhesive is filtered off with a 150 mesh stainless steel wire net, and the mold has a diameter of 320 mm and a thickness of 20 mm. Filled. Here, the solid content of the latex adhesive adhered to the synthetic silica was about 1.8% with respect to the synthetic silica. Next, after preheating at 130 ° C. for 60 minutes, the mold was released from the mold, further heated at 130 ° C. for 30 minutes, and then cooled to room temperature to obtain a dehumidified molded body.
The obtained dehumidifying rotor was incorporated into a commercially available desiccant type dehumidifying dryer, and pressure loss, dehumidifying ability and regeneration rate were evaluated. The results are shown in Table 1. In addition, the numerical value of each evaluation item is displayed as a ratio on the basis of the characteristic value of the comparative example which is a conventional dehumidification rotor. The lower the pressure loss, the better. The higher the dehumidifying capacity and the regeneration speed, the better.

(Example 2)
A dehumidifying rotor was molded in the same manner as in Example 1 except that the thickness of the dehumidified molded body was 10 mm, and evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 1)
Based on the method described in Patent Document 1, inorganic fibers mainly composed of ceramic fibers are formed into a honeycomb shape shown in FIG. 6, dipped in water glass and dried, dipped in sulfuric acid, washed with water, dried, and a diameter of 320 mm, A dehumidification rotor made of silica erogel having an inorganic fiber with a thickness of 20 mm as a skeleton and made without using a latex adhesive was obtained and evaluated in the same manner as in Example 1. The results are shown in Table 1.

  From Table 1, it can be seen that the pressure loss is reduced, the dehumidifying ability is high, and the regeneration speed is high as compared with the conventional dehumidifying rotor. In particular, as shown in Example 2, the dehumidified molded article of the present invention is excellent in dehumidifying ability and regeneration speed even when its volume is reduced, indicating that the apparatus can be miniaturized.

  The dehumidified molded body and the dehumidified composite molded body of the present invention are a humidity control device that absorbs moisture in the air or, conversely, releases and absorbs moisture, specifically, desiccant air conditioners and hybrid desiccants. It can be suitably used for a dehumidifying rotor of an air conditioner. In terms of application, it can be applied to the field of air conditioning equipment, use of exhaust heat of PEM type fuel cells, and the like.

FIG. 1 is a schematic view showing an adhesive structure of a hygroscopic agent. FIG. 2 is a manufacturing process diagram of a dehumidified molded body, a) showing a basic manufacturing process, b) showing a manufacturing process of a molding rubber mold, and c) an aggregate, an outer frame material and an exterior frame material. The manufacturing process of is shown. FIG. 3 is a cross-sectional view of a dehumidified molded body. FIG. 4 is a cross-sectional view of the dehumidifying composite molded body. FIG. 5 is a schematic diagram of a humidity control apparatus. FIG. 6 is a diagram showing the structure of a conventional dehumidifying rotor.

Explanation of symbols

C ... Primary particles D of hygroscopic silica D ... Secondary aggregated particles E of silica for hygroscopic E ... Latex particles 40 of latex adhesive ... Molded body 41 of hygroscopic agent ... Wire mesh 42 ...・ Outer frame material for wire mesh

Claims (9)

A molded article for dehumidification, wherein a moisture absorbent is bound using a latex adhesive and molded. The dehumidifying molded article according to claim 1, wherein the hygroscopic agent is zeolite, porous silica, or porous carbon. The dehumidified molded article according to claim 1 or 2, wherein the moisture absorbent is water repellent. The molded article for dehumidification according to any one of claims 1 to 3, wherein the latex has a latex particle size of 0.05 to 0.2 µm. The molded article for dehumidification according to any one of claims 1 to 4, wherein the latex adhesive is an acrylic polymer latex. The molded body for dehumidification according to any one of claims 1 to 5, which is reinforced with an aggregate or an outer frame material. The molded article for dehumidification according to claim 6, wherein the aggregate or the outer frame is composed of a porous foil strip. A dehumidified composite molded body comprising a heat exchanger included in the dehumidified molded body according to any one of claims 1 to 7. The composite molded body for dehumidification according to claim 8, wherein the heat exchanger comprises a heat pipe, a heat exchange fin, or a heat pump.

Images