JPH0985081A - Dew condensation suppression method and dew condensation suppression material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a dewing suppressing material effectively suppressing dewing in a region apprehensive of generating dewing in a house to absorb humidity and discharging humidity when indoor environment is dried to inexpensively suppress dewing in a house. SOLUTION: A dewing suppressing material in a house is obtained by molding a humidity absorbing and discharging compsn. containing 100 pts.wt. of a thermoplastic resin, 10-1000 pts.wt. of at least a humidity absorbing and discharging substance selected from org. and inorg. humidity absorbing and discharging substances and, if necessary, a foaming agent and arranged in the region intending the suppression of dewing in a house. Further, a dewing suppressing material having a wooden humidity absorbing and discharging material unevenly distributed thereof is arranged in the vicinity of the region in a house intending the suppression of dewing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention intends to suppress the dew condensation of a moisture absorbing / releasing molded article composed of a specific ratio of specific components, for controlling dew condensation on the opening / closing part of a window of a house or the inside of a wall. The present invention relates to a method for installing dew near a site in a house, preferably in a manner to cover the site without closely contacting the site, and suppressing dew condensation on the site, and a dew condensation suppressing material for carrying out the method.

[0002]

2. Description of the Related Art In recent homes, the airtightness of homes has increased due to the spread of sashes, heat insulating materials and the like. Along with this, the occurrence of dew condensation is increasing on the inside surface of the wall that is in contact with the outside air and the inside surface of the house such as the opening and closing part such as windows. This dew condensation causes stains and mold on the surface of the cloth, peels off the cloth, and corrodes wood, which is a structural material of wooden houses and furniture. These dew condensation phenomena not only make the occupants uncomfortable, but also cause various inconveniences such as the health of the occupants being damaged and the strength of the dwelling being reduced.

Condensation is a phenomenon in which water drops below the dew point and forms water drops when high-temperature and high-humidity air generated by human activity comes into contact with a low-temperature part in a room. In order to suppress this, in order to eliminate the temperature unevenness in the house, heat insulation is enhanced, or dehumidification is performed using a dehumidifier or the like. However,
Increasing the heat insulating property does not reduce the generated moisture, so that when the temperature of the entire room is reduced, an environment where dew condensation occurs is created. When using a dehumidifier,
If it is too dry, it may cause cracks in the interior and walls, and may promote virus propagation.

Dew condensation, especially surface dew condensation, often occurs on the opening / closing part such as a window in the house, the inner surface of the wall in contact with the outside air, and the indentation as described above. Normally, curtains, blinds, etc. are used in the windows for the purpose of providing comfort such as blindfolding, shading, creating atmosphere in the room, and good living comfort, but these cannot sufficiently suppress dew condensation.

In general, polyvinyl chloride cloth is often used for the wall portion, but it has almost no moisture absorption and desorption property and no effect of suppressing dew condensation on the wall surface. It has been proposed in Japanese Patent Laid-Open No. 65075/1983 that a super absorbent polymer is heated and mixed with a thermoplastic resin for the purpose of suppressing dew condensation on the wall surface so as to have hygroscopicity and form a wallpaper. . However, the superabsorbent polymer absorbs moisture, but when the indoor environment is dry, it does not release it, so there is a problem in terms of the humidity control function. There is a problem that the moisture absorption effect is no longer exhibited. In addition, super absorbent polymers have the disadvantages of high cost and high wallpaper costs.

On the other hand, it has long been practiced to spread a substance having a moisture absorbing / releasing property under the floor, tatami mat, or under the carpet for the purpose of controlling the humidity under the floor, controlling the humidity inside the room and suppressing the dew condensation.
Examples of the hygroscopic particles include charcoal, silica gel, silica sand and the like. However, these are difficult to process, have a low degree of freedom in shape, and cannot be molded as a member, so that the place where they are installed in a house is limited and the range of use is limited. Further, the humidity control by these is performed in a relatively closed space such as under the floor, in a push-in room or in a tatami room where air does not move much, and is rarely used in a space where air often flows in and out, such as a living room.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to effectively suppress the dew condensation at a site in a house intended to suppress dew condensation, and to release it when the indoor environment becomes dry with moisture absorption in the house. The object of the present invention is to provide an inexpensive method of suppressing dew condensation in a house, which has a wide range of use, and a dew condensation suppressing material that can be used for the method.

[0008]

The dew condensation suppressing method of the present invention has the following features. (1) Condensation formed by molding a moisture absorptive and desorptive composition containing 100 parts by weight of a thermoplastic resin and 10 to 1,000 parts by weight of at least one moisture absorptive and desorptive substance selected from organic and inorganic moisture absorptive and desorptive substances. A method for suppressing dew condensation, characterized in that a material for suppressing dew condensation is installed in the vicinity of a site in a house intended to suppress dew condensation.

(2) A foamable hygroscopic composition containing 100 parts by weight of a thermoplastic resin and 10 to 1000 parts by weight of at least one hygroscopic material selected from organic and inorganic hygroscopic materials. A dew condensation suppressing method comprising using a dew condensation suppressing material, which is foam-molded and has a foaming ratio of 30 times or less, at a site in a house intended to suppress dew condensation.

(3) The dew condensation suppressing method as described in (2) above, wherein the foamed material for dew condensation suppressing has an open cell rate of 30 to 90%.

(4) The organic moisture absorbing / releasing substance is at least one selected from carbohydrates and charcoal (1).
The dew condensation suppressing method according to any one of to (3).

(5) The dew condensation suppressing method as described in any one of (1) to (3) above, wherein the inorganic moisture absorbing / releasing substance is at least one selected from porous particles and inorganic salts.

(6) A moisture absorbing / releasing composition in which the organic moisture absorbing / releasing material is a wood moisture absorbing / releasing material, and the dew condensation suppressing material contains a thermoplastic resin and the wood moisture absorbing / releasing material is molded. The dew condensation suppressing method as described in (1) or (2) above, wherein the wood-based moisture absorbing / releasing material is unevenly distributed on the surface side of the dew condensation suppressing material.

(7) The dew condensation suppressing method as described in any one of (1) to (6) above, wherein the dew condensation suppressing material is installed in such a manner as to cover the inside of the house without making it in close contact with it.

The dew condensation suppressing material of the present invention has the following features. (8) A foamable hygroscopic composition containing 100 parts by weight of a thermoplastic resin and 10 to 1000 parts by weight of at least one hygroscopic material selected from organic and inorganic hygroscopic materials is foam-molded. And the expansion ratio is 30
Condensation control material that is less than double.

(9) The dew condensation suppressing material as described in (8) above, wherein the foamed molded dew condensation suppressing material has an open cell rate of 30 to 90%.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic resin used in the present invention is
It is not particularly limited as long as it can be used in the house, and those known in the art can be used. Vinyl resin,
Polyolefin resin such as polyethylene and polypropylene, ethylene-vinyl acetate copolymer, polyamide resin such as nylon, polystyrene resin, polyester resin such as polyethylene terephthalate and polybutylene terephthalate, ABS resin, ethylene-propylene rubber, ethylene -Examples include thermoplastic rubber-based resins such as propylene-diene copolymer.

In the present invention, the moisture absorptive and desorptive substance means a substance capable of absorbing moisture in a humid environment and releasing the absorbed moisture again in a dry environment. The degree of moisture absorption is usually 5 to 100% by weight, preferably 10 to 100% by weight, more preferably 15 to 100% by weight.
% By weight. Here, the degree of moisture absorption is 25 ° C, 50% R
After the equilibrium state with H, the temperature was increased to 90% RH at a constant temperature, and the water content was increased after standing for 24 hours. The degree of moisture release is usually -5 to -1.
The amount is 00% by weight, preferably -10 to -100% by weight, more preferably -15 to -100% by weight. Here, the degree of moisture release is obtained by measuring the degree of moisture absorption at a constant temperature of 50.
It is measured by the amount of decrease in water content after being lowered to% RH and left standing for 4 hours.

The organic moisture absorbing / releasing substance used in the present invention is not particularly limited as long as it has an moisture absorbing / releasing property and can be used in a house. For example, a wood substance (for example,
Wood flour, wood fiber, etc.), carbohydrates such as starch, charcoal, etc. As the wood substance, a grain board obtained from hardwood or softwood, plywood, wood particles obtained by crushing particleboard, wood powder such as sawdust that appears during sawing, pulp, wood fibers obtained from paper sludge, etc. A fiber etc. are illustrated. In the present specification, among the organic moisture absorptive and desorptive substances, those that are particularly woody substances are referred to as woody moisture absorptive and desorptive materials. The raw material of this wood-based moisture absorbent material,
There is no particular limitation on the place of origin, the form, etc. It is also possible to use plant fibers such as cotton and hemp containing cellulose.
Further, these moisture absorbing / releasing materials may be used alone or in combination of two or more kinds.

The shape of the organic moisture absorbing / releasing substance is not particularly limited as long as it can be mixed with the thermoplastic resin. The size of the organic moisture absorptive and desorptive substance is not particularly limited, but when it is powdery or particulate, the diameter is about 1 to 5000 μm, preferably about 10 to 1000 μm, and when it is fibrous, the thickness is 1 To about 1000 μm, preferably 10 to 500 μm
About 0.1 to 50 mm, preferably 0.1 to 50 mm
It is desirable that it is about 10 mm.

The inorganic moisture absorbing / releasing substance used in the present invention is not particularly limited as long as it has an moisture absorbing / releasing property and can be used in a house, and is, for example, a porous material such as zeolite, silica gel or silica sand. Examples thereof include particles and inorganic salts such as lithium carbonate, calcium chloride and lithium chloride. The shape of the inorganic hygroscopic material is not particularly limited as long as it can be mixed with the thermoplastic resin. The size of the inorganic moisture absorptive and desorptive material is not particularly limited, but when it is in the form of particles, it has a diameter of 1 to 50.
About 100 μm, preferably about 10 to 1000 μm is desirable.

These moisture absorptive and desorptive substances may be used alone or in combination of two or more.

These moisture absorptive and desorptive substances may be chemically modified or physically modified for blending with the thermoplastic resin for the purpose of improving the affinity with the resin and improving the moisture absorptive and desorptive performance. The chemical modification is preferably carried out, for example, by reacting a moisture absorbing / releasing substance with an organic or inorganic compound. For example, in the case of carbohydrates, especially woody substances, for example, those that cause a chemical reaction by the hydroxyl group of the sugar chain that forms the main component of wood, such as cellulose, hemicellulose or lignin, are mentioned. It is not particularly limited as long as it can increase the moisture releasing capacity. Specific examples thereof include esterification, etherification, acetalization, isocyanate treatment, and plasticization such as benzylation.

For the esterification, acid anhydrides such as acetic anhydride, maleic anhydride, succinic anhydride and phthalic anhydride, and acids such as maleic acid, succinic acid, phthalic acid and salicylic acid are preferably used. For etherification, ethylene oxide, propylene oxide, butylene oxide, epichlorohydrin, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, and monoglycidyl ethers thereof are preferably used. Formaldehyde and acetaldehyde are preferably used for acetalization. Examples of the isocyanate used for the isocyanate treatment include methyl isocyanate, butyl isocyanate, phenyl isocyanate, 2,4-tolylene diisocyanate, and 4,4-diphenylmethane diisocyanate. Compounds used for benzylation include benzyl chloride and its derivatives.

The physical modification is preferably a glycol such as polyethylene glycol, polyethylene glycol monomethyl ether or triethylene glycol,
Polyhydric alcohols such as glycerin, sorbitol, mannitol, and threitol, those impregnated with organic substances such as polysaccharides such as cellulose and starch, boric acid, borax, boron oxide and borate salts such as ammonium borate and potassium borate Such as boron compounds, phosphoric acid, phosphoric acid amides, ammonium phosphate, phosphorus compounds such as phosphates such as potassium phosphate, silicic acid, sodium silicate, calcium silicate, lithium chloride, calcium chloride, etc. Those impregnated with inorganic substances such as salt, those subjected to delignification by subjecting wood to explosive treatment, those immersed in organic solvents such as acetone, benzene, hexane, those subjected to oxidation treatment with sodium chlorite, etc. Etc.

The amount of the moisture absorbing / releasing substance added to 100 parts by weight of the thermoplastic resin is 10 to 1000 parts by weight, preferably 50 to 1000 parts by weight, more preferably 100 to 100 parts by weight.
0 parts by weight. If the addition amount is less than 10 parts by weight,
It is inferior in moisture absorption and desorption, the desired performance cannot be obtained, and the touch feeling is not sufficient. On the other hand, if the amount exceeds 1000 parts by weight, gelation of the resin becomes insufficient during kneading with the thermoplastic resin, and molding cannot be performed by using a usual thermoplastic resin molding method. Furthermore, when molded, the strength of the molded body is significantly reduced.

In the moisture absorptive and desorptive composition of the present invention, if necessary, usual additives such as stabilizers, lubricants, plasticizers, pigments, antistatic agents, antifogging agents, processability improvers and impact improvers are added. May be added in an appropriate amount. Furthermore, as described later, a foaming agent can be added to the moisture absorptive and desorptive composition. In addition, you may make it add these additives at the time of shape | molding a composition so that it may mention later.

With respect to the present invention, examples of the form of the material for suppressing dew condensation include woven cloth, non-woven cloth, thick or thin film, sheet, board and molded body. These can be produced by a method known per se.

The dew condensation suppressing material used in the present invention is manufactured, for example, by the following method. A method for molding a kneaded product of a moisture absorptive and desorptive substance and a thermoplastic resin, particularly a melt kneaded product. A usual method can be used for the preparation of the kneaded product,
Although not particularly limited, examples thereof include a method of dry blending with a hand blend, a Henschel mixer, other general agitators, and the like, and kneading by roll kneading and the like.
The kneaded product is formed into a sheet or the like by a single-screw extruder, a twin-screw extruder, calendering or the like.

The dew condensation-suppressing material of the present invention may be formed by foaming the moisture absorptive and desorptive composition of the present invention, preferably by mixing with a foaming agent. According to this, the dew condensation-suppressing material has cushioning properties, elasticity, and the like, and in particular, by appropriately adjusting the bubble diameter and the open cell ratio of the foam, the moisture absorption and desorption efficiency can be further improved. can do. Such a dew condensation-suppressing material is specifically obtained, for example, by melt-extruding the moisture absorptive and desorptive composition and the foaming agent, or by foaming by molding a mixture thereof.

In the case of the above-described melt extrusion, for example, the foaming agent-containing moisture absorbing / releasing composition may be kneaded in an extruder and then the kneaded product may be extrusion-molded. Further, the kneading of the moisture absorptive and desorptive composition and the foaming agent, a method of melt-kneading the moisture absorptive and desorptive composition and the foaming agent in an extruder, or kneading by adding the foaming agent to the moisture absorptive and desorptive composition in a molten state. It can be performed by the method of doing.

Alternatively, a mixture of the moisture absorptive and desorptive composition and the foaming agent may be shaped in a mixed state, and the mixture may be heated and melted to foam the foaming agent during molding.

When a method of melt-kneading the moisture absorptive and desorptive composition and the foaming agent in an extruder, or a method of shaping the mixture in a mixed state and heat-foaming the foaming agent, a thermal decomposition type foaming agent is used. And the like, specifically, azodicarbonamide, azobisisobutyronitrile, trihydrazinotriazine, benzenesulfonyl semicarbazide, diazodiaminobenzene, N, N'-dinitrosopentamethylenetetramine, N, N'- One or more selected from dimethyl-N, N'-dinitroterephthalimide, barium azodicarboxylate, p-toluenesulfonylhydrazine, p, p'-oxybisbenzenesulfonylhydrazide and the like can be used.

On the other hand, when the method of adding a foaming agent to a molten moisture absorbing / releasing composition and kneading is used, examples of the foaming agent include a volatile foaming agent, and specifically, propane and butane. , Isobutane, pentane, hexane, aliphatic hydrocarbons such as heptane, cycloheptane, cyclopentane, alicyclic hydrocarbons such as cyclohexane, chlorodifluoromethane, dichloromethane, dichlorofluoromethane, dichlorodifluoromethane, trichlorofluoromethane, Chloroethane, dichlorotrifluoroethane,
One or more selected from halogenated hydrocarbons such as dichlorotetrafluoroethane, trichlorotrifluoroethane, tetrachlorodifluoroethane and perfluorocyclobutane, inorganic gases such as carbon dioxide, nitrogen and air can be used.

In addition, in any of the above methods, the water contained in the wood-based moisture absorbing / releasing material can act as a foaming agent. Furthermore, the thermal decomposition type foaming agent, the volatile foaming agent, the inorganic gas and the like may be appropriately mixed and used.

The amount of the foaming agent to be added may be selected depending on the kind of the foaming agent, the desired expansion ratio, the open cell ratio, the closed cell ratio, etc., but it is usually 1 to 100 with respect to 100 parts by weight of the binder. It is desirable that the amount is about part by weight, preferably about 2 to 50 parts by weight.

If necessary, a foam nucleating agent such as sodium bicarbonate-citric acid or talc may be used in combination in order to appropriately control the bubble diameter and the open cell ratio in the dew condensation suppressing material after foaming.

The foaming ratio of the dew condensation suppressing material after foaming is preferably 30 times or less, more preferably 1 to 20 times. When the expansion ratio is 30 times or less, the material for suppressing dew condensation can maintain the shape retention property, and the shape is less likely to be broken due to contact with other materials. On the other hand, if the expansion ratio is 1 or more, the properties as a foam will be sufficient. Here, the expansion ratio is calculated from the ratio between the density of the foam and the density of the non-foam calculated from the weight and the volume obtained by the submersion method.

Further, it is desirable that the rate of continuous foaming in the dew condensation suppressing material after foaming is 30 to 90%, preferably 40 to 85%. When the open cell rate is 30% or more, the surface area of the dew condensation suppressing material is large and a large amount of the moisture absorbing / releasing material is exposed on the surface, so that the moisture absorbing / releasing efficiency is good. On the other hand, the open cell ratio is 9
When the content is 0% or less, the moisture permeation resistance becomes sufficient, and the moisture hardly passes through the dew condensation suppressing material, so that the dew condensation suppressing material rarely loses the moisture absorption / release property. The open cell ratio here is a multi-pycnometer (manufactured by Yuasa Ionics Co., Ltd.)
Is measured according to ASTM D-2825.

In the present invention, in the dew condensation suppressing material comprising a moisture absorbing / releasing composition containing a woody moisture absorbing / releasing material and a thermoplastic resin, the woody moisture absorbing / releasing material is unevenly distributed on the surface side. Then, it is possible to obtain a dew condensation suppressing material having good moisture absorption and desorption, which is desirable. Such a dew condensation suppressing material can be obtained, for example, by depositing a wood-based moisture absorbing / releasing material on the thermoplastic resin layer, particularly by forming a wood-based moisture absorbing / releasing material layer.

The wood-based moisture absorbing / releasing material layer is formed, for example, by melting and softening a thermoplastic resin, and in this state, depositing the wood-based moisture absorbing / releasing material in layers on the thermoplastic resin layer. You can More specifically, for example, while extrusion-molding a thermoplastic resin, a method of depositing a wood-based moisture absorbing / releasing material on the surface of the thermoplastic resin in a softened state and press-molding or rolling with a calender roll , A thermoplastic resin is previously molded into an arbitrary shape such as a sheet or board by injection molding, thermoforming, etc., and the molded product is heated to make its surface in a molten state, and the wood-based moisture absorbing / releasing material is applied to the surface. A method of depositing a resin, a method of thermocompression-bonding a wood-based moisture absorbing / releasing material on the surface of the molded product obtained as described above, and after molding a thermosetting resin, the wood-based absorbent is cured before the binder is cured. A method of depositing a moisture releasing material is exemplified.

The wood-based moisture absorbing / releasing material layer may be formed on at least one surface of the dew condensation suppressing material. For example, as described later, the dew condensation suppressing material is brought into close contact with a portion intended to suppress dew condensation. In the case of arranging without moisture, it is desirable that the wood-based moisture absorbing / releasing material layer is formed on both surfaces of the dew condensation suppressing material, which can further improve the moisture absorbing / releasing characteristics of the dew condensation suppressing material. it can.

The dew condensation suppressing method of the present invention uses the dew condensation suppressing material in any suitable form such as curtains, blinds,
As a form of tapestry, wallpaper, etc., it is carried out by installing in the vicinity of a site in the house intended to suppress dew condensation, and preferably by covering the site without adhering. There is no particular limitation on the part of the dwelling that is intended to suppress dew condensation, and examples thereof include the indoor side of a wall in contact with the outside air, the dwelling inner surface of an opening / closing part such as a window, and a pushing wall.

When covering without adhering, an appropriate gap (for example, 10 to 500) is formed between the dew condensation suppressing material and the application site.
mm, preferably about 50 to 300 mm). Further, in the case of an opening / closing part such as a window, for example, a dew condensation suppressing material may be arranged in the same manner as a normal curtain, and in the case of a wall surface, it may be arranged by hanging from a ceiling or wall surface like a tapestry. do it.

Since the dew condensation suppressing material of the present invention is composed of the above moisture absorptive and desorptive composition, it exhibits not only hygroscopicity but also moisture absorptivity. Therefore, the dew condensation suppressing material of the present invention can be suitably used not only for dew condensation suppression but also for indoor humidity control.

[0046]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited thereto.

Example 1 Polyvinyl chloride 100 parts by weight, plasticizer 100 parts by weight, impact modifier 10 parts by weight, cedar wood powder (moisture absorption: 18% by weight, moisture release: -17% by weight) 100 parts by weight Were mixed and calendered to obtain a sheet having a thickness of 0.5 mm. This is an average of 1 from the window in the vicinity of the indoor side of the window, like a curtain.
They were set apart by 00 mm. Outdoor temperature 0 ℃, 50% RH
Under the environment, the room was set at 20 ° C. and 80% RH, and the amount of dew condensation in the room was evaluated. The evaluation was performed in three stages, and the results are shown in Table 1. The evaluation criteria are as follows. ◯: No condensation at all Δ: Some condensation occurs ×: A large amount of condensation occurs

Example 2 A sheet was formed in the same manner as in Example 1 and placed so as to cover the wall surface without adhering to each other, and the amount of dew condensation was evaluated. The results are shown in Table 1.

Comparative Example 1 In the same manner as in Example 1, a commercially available polyester curtain was placed on the window and evaluated. The results are shown in Table 1.

Examples 3 to 4 In the same manner as in Example 1, using charcoal (moisture absorption: 30 wt%, moisture release: -28 wt%) instead of cedar wood powder, sheets were obtained, and Example 3 was carried out. Example 1 and Example 4 were evaluated in the same manner as Example 2.

Examples 5 to 6 In the same manner as in Example 1, using zeolite (moisture absorption: 28 wt%, moisture release: -18 wt%) instead of cedar wood powder, sheets were obtained, and Example 5 was carried out. Example 1 and Example 6 were evaluated in the same manner as Example 2.

Example 7 100 parts by weight of polyvinyl chloride, 100 parts by weight of a plasticizer, 10 parts by weight of an impact modifier, 100 parts by weight of the same cedar wood powder as in Example 1 and 5 parts by weight of azodicarbonamide. Mix and dry blend with a Henschel mixer. Thereafter, this mixture was melt-kneaded by a single-screw extruder and extruded by a T-die to obtain a foamed sheet having a thickness of 1 mm. This sheet was evaluated in the same manner as in Example 2.

Examples 8 and 9 Instead of using cedar wood flour in Example 7, Example 8
Then, the same charcoal as in Example 3 was used, and in Example 9 the same zeolite as in Example 5 was used, and a sheet was prepared in the same manner as in Example 7, and evaluated in the same manner.

Comparative Example 2 A sheet was prepared and evaluated in the same manner as in Example 7 except that cedar wood powder was not used.

Example 10 100 parts by weight of polyvinyl chloride, 100 parts by weight of a plasticizer and 10 parts by weight of an impact modifier were dry blended with a Henschel mixer. Then, this mixture was melt-kneaded by a single-screw extruder and extruded into a sheet by a T-die, and when the sheet was in a molten state, the same cedar wood powder as in Example 1 was dropped on the surface thereof. Deposited. Then, the sheet-like material was rolled with a calendar roll to obtain a sheet having a thickness of 1 mm. This sheet was evaluated in the same manner as in Example 2.

Examples 11 and 12 Instead of using cedar wood flour in Example 10, the same charcoal as in Example 3 was used in Example 11, and the same zeolite as in Example 5 was used in Example 12, Example 10 A sheet was produced in the same manner as in and evaluated in the same manner.

Comparative Example 3 A sheet was prepared and evaluated in the same manner as in Example 10 except that cedar wood powder was not used.

[Moisture Absorption / Desorption Characteristic Test] The above Examples 1 to 12,
Sheets obtained in Comparative Examples 1 to 3 (those in a dry state)
Each of them is cut into a size of 10 mm x 10 mm and placed in an environment where the temperature and humidity are set to 25 ° C and 90% RH for 24 hours.
Left for hours. Then, the weight change of each sheet was measured to obtain the water content (% by weight), and the hygroscopicity was evaluated using this as an index. The results shown in Table 1 were obtained. The sheet was equilibrated at 25 ° C. and 50% RH, the humidity was raised to 90% RH at a constant temperature, and the sheet was allowed to stand for 24 hours to measure the change in water content. Then, the humidity was lowered from 90% RH to 50% RH at a constant temperature and left for 24 hours to measure the change in water content. The rate of moisture absorption and desorption was evaluated using the amount of change in water content as an index.
The result shown in FIG.

[0059]

[Table 1]

However, Examples 7 to 9 in Table 1 and Comparative Example 2
The expansion ratio and open cell ratio in Table 2 were as follows. Example 7: Foaming ratio 2.0, open cell ratio 40. Example 8: Foaming ratio 2.2, open cell ratio 38. Example 9: Expansion ratio 2.8, open cell ratio 42. Comparative Example 2; foaming ratio 3.2, open cell ratio 45.

[0061]

The dew condensation suppressing method of the present invention uses the dew condensation suppressing material of the present invention, which is formed by blending a moisture absorbing / releasing substance with a thermoplastic resin, in a window such as a window of a house or inside a house such as an inner wall of a house. The dew condensation is performed by installing it in the vicinity of a site where dew condensation is likely to occur, preferably so as to cover the site, thus effectively suppressing dew condensation in the house.

Claims (9)

[Claims] 1. A thermoplastic resin of 100 parts by weight, and at least one selected from organic and inorganic hygroscopic materials.
A dew condensation suppressing material obtained by molding a moisture absorptive and desorptive composition containing 10 to 1000 parts by weight of a specific moisture absorptive and desorptive substance, is installed in the vicinity of a site in a house intended to suppress dew condensation. . 2. 100 parts by weight of a thermoplastic resin, and at least one selected from organic and inorganic hygroscopic materials.
The foaming-type hygroscopic composition containing 10 to 1000 parts by weight of a moisture absorbing / releasing substance is foamed and molded, and a dew condensation suppressing material having a foaming ratio of 30 times or less is a part in a house intended to suppress dew condensation. A method for suppressing dew condensation, which is used for. 3. The dew condensation suppressing method according to claim 2, wherein the foamed material for dew condensation suppressing has an open cell rate of 30 to 90%. 4. The dew condensation suppressing method according to claim 1, wherein the organic moisture absorbing / releasing substance is at least one selected from carbohydrates and charcoal. 5. The inorganic moisture absorbing / releasing substance is at least one selected from porous particles and inorganic salts.
The method for suppressing dew condensation according to any one of 3 above. 6. The organic moisture absorbing / releasing material is a wood moisture absorbing / releasing material, and the moisture condensation suppressing material is formed by molding a moisture absorbing / releasing composition containing a thermoplastic resin and the wood moisture absorbing / releasing material. The dew condensation suppressing method according to claim 1 or 2, wherein the wood-based moisture absorptive and desorptive material is unevenly distributed on the surface side of the dew condensation suppressing material. 7. The dew condensation suppressing method according to any one of claims 1 to 6, wherein the dew condensation suppressing material is installed in such a manner as to cover the inside of the house without making it in close contact with it. 8. A thermoplastic resin of 100 parts by weight and at least one selected from organic and inorganic hygroscopic materials.
A material for suppressing dew condensation, which is obtained by foam-molding a foamable hygroscopic composition containing 10 to 1000 parts by weight of a specific hygroscopic substance, and has an expansion ratio of 30 times or less. 9. The dew condensation suppressing material according to claim 8, wherein the foamed molded dew condensation suppressing material has an open cell rate of 30 to 90%.