JP2019196625A - Moisture-conditioning wall material - Google Patents

Abstract

To provide a lightweight and highly workable moisture-conditioning wall material which uses materials having different moisture-absorbing speed and moisture-absorbing capacity materials for a surface layer and a lower layer so that the moisture-absorbing ability can be fully demonstrated while satisfying the moisture-conditioning performance of the long-term cycle.SOLUTION: The moisture-conditioning wall material configured to arrange a diatomite-containing layer for a surface layer and a hygroscopic fiber-containing non-woven fabric layer for a lower layer is characterized in that a crosslinked acrylate fiber is used as the hygroscopic fiber, and the thickness of the diatomite-containing layer is 1 to 4 mm.SELECTED DRAWING: None

Description

  The present invention relates to a moisture control wall material having a high moisture absorption capacity that is lightweight, excellent in workability, and excellent in long-term cycle humidity control. Specifically, the surface layer (exposed side) has a diatomite-containing layer having a low moisture absorption rate. By arranging a thin layer, and a hygroscopic fiber-containing non-woven fabric layer with a high moisture absorption rate and high moisture absorption capacity on the lower layer (wall side), the moisture transfer capacity of the lower layer is adequately controlled by appropriately controlling the movement of absorbed moisture. The present invention relates to a humidity control wall material that can be used in the present invention.

  Recent buildings have improved their indoor sealing performance due to advances in building materials, and have succeeded in providing a comfortable temperature and humidity space by improving temperature and humidity control technology for heating equipment and air conditioners. It's getting on.

  However, most of the indoors with high airtightness are surrounded by wall materials such as interior materials and wallpaper made of petrochemical raw materials, so it is not possible to substantially absorb and release moisture indoors. There was a big problem with humidity control. In particular, the interior of the room becomes too dry during heating, and there is a problem in that electricity consumption is increased by going back to energy saving by relying on an air conditioner too much during the high humidity rainy season.

  In recent years, a large number of humidity control members that do not rely on temperature and humidity control facilities have been developed to deal with such problems, and board-type and tile-type humidity control building materials have been proposed. For example, calcium silicate-based or silicate-based building materials (see Patent Document 1) having pores under specific conditions and cosmetic materials (see Patent Document 2) having a moisture absorbing / releasing resin layer made of a binder resin and diatomaceous earth are proposed. ing.

  However, building materials using inorganic moisture absorbing / releasing materials need to be thickened in order to fully exhibit the humidity control function, or the moisture absorbing / releasing material content must be increased, which is very heavy and easy to work with. There was a bad problem. Further, the inorganic moisture absorbing / releasing material has a problem in that it takes time to dehumidify because of its slow moisture absorption rate, and the humidity control property cannot be exhibited effectively.

  As what improves said problem, for example, the humidity control wallpaper (refer patent document 3) of the three-layer structure which uses the nonwoven fabric containing a moisture absorption / release fiber and a heat-fusible fiber as an intermediate layer, patent document 3, A plate-shaped building material (Patent Document 4) formed by heat-pressing a nonwoven fabric containing reinforcing fibers and hygroscopic fibers has been proposed.

  As described above, the moisture-conditioning material composed of a nonwoven fabric using moisture-absorbing and releasing fibers is excellent in that it is lightweight and has a high moisture absorption rate, but because the moisture absorption rate is fast, the vicinity of the surface that has absorbed moisture immediately becomes saturated, and deeper than that. There was a problem that the moisture content of the nonwoven fabric was delayed and the moisture absorption capacity of the whole nonwoven fabric was not fully utilized. Moreover, the thing using the moisture absorption / release fiber could not perform appropriately the moisture absorption / release according to the temperature-humidity fluctuation | variation of a long-term cycle of one day.

JP-A-5-293367 Japanese Patent Laid-Open No. 11-207853 JP 2005-220449 A JP 2009-097207 A

  The present invention was devised in view of the above-described problems of the prior art, and its purpose is to use materials with different moisture absorption speeds and moisture absorption capacities for the surface layer and the lower layer while satisfying the humidity control performance of a long-term cycle. An object of the present invention is to provide a moisture-control wall material that is light in weight and excellent in workability so that it can sufficiently exhibit moisture absorption capacity.

  As a result of intensive studies to achieve the above-mentioned object, the present inventor has provided a diatomaceous earth-containing layer having a slow moisture absorption rate and excellent design properties on the surface layer, and a crosslinked acrylate-based layer having a high moisture absorption rate and a large moisture absorption capacity in the lower layer. By providing a non-woven fabric layer containing hygroscopic fibers, the movement speed of moisture absorbed by the surface layer to the lower layer is relaxed. As a result, it was found that it was possible to diffuse gently to every corner of the film and to fully utilize the moisture absorption capacity of the entire lower layer, and the present invention was completed.

That is, the present invention has the following configurations (1) to (12).
(1) A humidity control wall material configured to arrange a diatomite-containing layer on the surface layer and a hygroscopic fiber-containing nonwoven fabric layer to the lower layer, and using a crosslinked acrylate fiber as the hygroscopic fiber And the thickness of the diatomaceous earth content layer was 1-4 mm, The humidity control wall material characterized by the above-mentioned.
(2) The humidity control wall material according to (1), wherein the nonwoven fabric layer contains 10 to 80% by mass of hygroscopic fibers.
(3) The humidity adjusting wall material according to (1) or (2), wherein the crosslinked acrylate fiber has a carboxyl group of 0.1 to 10 mmol / g.
(4) The humidity control wall material according to any one of (1) to (3), wherein the nonwoven fabric layer contains polyester heat-adhesive fibers in addition to moisture-absorbing and releasing fibers.
(5) The moisture-controlling wall material according to (4), wherein the moisture absorbing / releasing fibers and the polyester heat-bonding fibers in the nonwoven fabric layer are 30 to 80% by mass and 15 to 50% by mass, respectively. .
(6) The humidity control wall material according to (4) or (5), wherein the nonwoven fabric layer further contains a polyester reinforcing fiber at a maximum of 40% by mass.
(7) The humidity adjusting wall material according to any one of (1) to (6), wherein the diatomaceous earth-containing layer contains 30 to 60% by mass of diatomaceous earth.
(8) The humidity control wall material according to any one of (1) to (7), wherein the total thickness of the humidity control wall material is 3 to 20 mm.
(9) The moisture control wall material according to any one of (1) to (8), wherein the hygroscopic fiber-containing nonwoven fabric layer has a thickness of 2 to 15 mm.
(10) The humidity control wall material according to any one of (1) to (9), wherein the diatomaceous earth-containing layer has a thickness of 1 to 3.5 mm.
(11) The moisture control wall material according to any one of (1) to (10), wherein the moisture-absorbing and releasing fiber-containing nonwoven fabric layer has a basis weight of 800 to 1800 g / m ² .
(12) A moisture control wall material according to any one of (1) to (11), wherein a moisture permeable binder layer is provided between the diatomaceous earth-containing layer and the hygroscopic fiber-containing nonwoven fabric layer. .

  The humidity control wall material of the present invention is provided with a diatomite-containing layer having a slow moisture absorption rate on the surface layer, so that moisture absorbed by the surface layer can be slowly transferred to the lower layer, and as a result, near the surface of the lower layer. Saturation of moisture can be avoided, and moisture can be diffused smoothly throughout the lower layer. Moreover, since the humidity-control wall material of this invention can also release moisture similarly similarly regarding moisture release, the humidity control performance of a long-term period is high. Moreover, since the humidity control wall material of this invention uses the diatomaceous earth content layer for the surface layer, it is excellent in the design of an external appearance, without using a decorative board. Furthermore, since the humidity control wall material of the present invention is provided with a non-woven fabric layer using polyester heat-adhesive fibers and polyester reinforcing fibers in the lower layer, it is excellent in shape retention, handling properties and workability.

  The humidity control wall material of the present invention is configured by disposing a diatomaceous earth-containing layer as a surface layer and disposing a hygroscopic fiber-containing nonwoven fabric layer as a lower layer. The surface layer has a role of absorbing moisture in the room and moving the absorbed moisture to the lower layer. In addition, the surface layer has a role of adjusting the amount of moisture transferred to the lower layer because the moisture absorption rate is slow. The lower layer has a role of quickly absorbing moisture transferred from the surface layer and diffusing and holding in the layer. By absorbing the moisture transfer rate to the lower layer on the surface layer, the moisture absorption of the lower layer is moderated, and the moisture absorption capacity of the lower layer can be maximized to absorb a large amount of moisture in the entire layer. is there. In the present specification, for the sake of clarity, the description mainly refers to the absorption of moisture (moisture), but it goes without saying that the release of moisture (moisture) as an opposite action also occurs. .

  The surface diatomite-containing layer is a layer containing diatomaceous earth having a hygroscopic effect, and a layer composed of 100% diatomaceous earth can also be used, but in terms of shape retention and workability, in addition to diatomaceous earth, clay and other It is preferable to contain a binder component. It is preferable that the content rate of the diatomaceous earth in a diatomaceous earth content layer is 30-60 mass%, More preferably, it is 35-55 mass%. If the content of diatomaceous earth in the diatomaceous earth-containing layer is less than the above lower limit, the moisture absorption / release effect may not be sufficiently exhibited, and if the upper limit is exceeded, the content of other components becomes too low, There is a risk of poor workability. Diatomaceous earth is composed of diatoms deposited on the sea floor, has pores inside, and exhibits moisture absorption and desorption effects by absorbing and holding surrounding moisture or discharging it. The type of diatomaceous earth used in is not particularly limited as long as it is conventionally used for building materials.

  In the present invention, clay refers to clay having no hygroscopicity other than diatomaceous earth, and is blended to reduce the content of diatomaceous earth and to impart design properties to wall materials. Other binder components include gypsum, glass fiber, methylcellulose, and binder resin. Among these, gypsum has a role which hardens the diatomaceous earth content layer and raises the intensity | strength of wall material. Glass fiber has a role which reinforces a diatomaceous earth content layer. Methylcellulose has a role as a thickener. Binder resin has a role which connects each component of a diatomaceous earth content layer. The content of clay in the diatomaceous earth-containing layer is generally 10 to 30% by mass, the content of gypsum is generally 10 to 30% by mass, and the content of glass fiber is generally It is 0.1-1 mass%, the content rate of methylcellulose is generally 0.5-4 mass%, and the content rate of binder resin is generally 5-15 mass%. As the binder resin, a conventionally known moisture-permeable thermoplastic resin can be used, and examples thereof include an ethylene-vinyl acetate copolymer, a polyolefin resin, and an acrylic resin.

The diatomaceous earth-containing layer preferably has a thickness of 1 to 4 mm, more preferably 1 to 3.5 mm. If the thickness is less than the above range, the moisture absorption function of diatomaceous earth does not sufficiently act, and if it exceeds the above range, it may take too much time to move the absorbed moisture to the lower layer. The diatomaceous earth-containing layer preferably has a basis weight of 250 to 1000 g / m ² , more preferably 250 to 875 g / m ² . If the basis weight is less than the above range, the layer becomes brittle, and if it exceeds the above range, the layer may be too heavy to be handled easily.

  The lower hygroscopic fiber-containing non-woven fabric layer is a non-woven fabric layer containing hygroscopic fibers having a hygroscopic effect, and the content ratio of the hygroscopic fibers is 10 to 80% by mass in terms of shape retention and hygroscopic effect. It is preferable that it is, More preferably, it is 20-70 mass%. The moisture-absorbing / releasing fiber has a higher moisture absorption rate than an inorganic moisture-absorbing material such as diatomaceous earth, and is lightweight and has a good on-site handling property. Moreover, the absorbed water | moisture content can be stored much by taking the form of a nonwoven fabric.

  In the present invention, a cross-linked acrylate fiber is used as the moisture absorbing / releasing fiber. The cross-linked acrylate fiber is a fiber having an acrylate polymer having a cross-linked structure and a carboxyl group as a constituent component, and has been known per se and can also be obtained from a commercial product. Cross-linked acrylate fibers include, for example, a cross-linking introduction treatment in an aqueous solution containing 0.1 to 5% by mass of a nitrogen-containing compound having two or more nitrogen atoms in one molecule, and an alkaline metal salt compound on acrylonitrile-based fibers. It can be obtained by performing a hydrolysis treatment in an aqueous solution containing 0.5 to 5% by mass.

The crosslinked acrylate fiber preferably contains 0.1 to 10 mmol / g, more preferably 0.5 to 8 mmol / g of carboxyl groups. If the amount of the carboxyl group is less than the above range, the hygroscopic effect is insufficient, and if it exceeds the above range, the fibers may swell when absorbed. The carboxyl group may be H-type, salt-type, or a mixture thereof, but 50% or more is preferably salt-type in order to exhibit sufficient moisture absorption performance. Examples of cations constituting the salt-type carboxyl group include alkali metals such as Li, Na and K, alkaline earth metals such as Ca, Be and Ba, Cn, Zn, Al, Mn, Ag, Fe, Co, Other metals such as Ni, NH ₄ , amines and the like may be mentioned, and plural kinds of cations may be mixed.

  The crosslinked acrylate fiber is preferably in the form of a short fiber, in which case the fiber length is preferably 20 to 60 mm and the single fiber degree is 2.0 to 11.0 dtex. In order to exhibit moisture absorption performance, the cross-linked acrylate fiber adopts a core-sheath structure having, for example, a surface layer portion made of an acrylic acid polymer having a carboxyl group and a cross-linked structure, and a central portion made of an acrylonitrile polymer. Can do. In this case, the surface layer portion bears a moisture absorption effect, and the central portion has a role of carrying fiber physical properties. In such a core-sheath structure, even if the surface layer portion absorbs moisture and swells, the central portion does not absorb moisture and swell, so that the shape is maintained as a whole and high dimensional stability can be ensured.

  The nonwoven fabric layer can contain other fibers such as a polyester heat-adhesive fiber in addition to the hygroscopic fibers. The polyester heat-bonding fiber is a fiber containing a component that melts at 100 to 180 ° C. when heated to show adhesiveness. For example, the sheath part is a low-melting point copolyester and the core part is a high-melting point polyethylene terephthalate. A core-sheath type polyester fiber can be employed. The content ratios of the moisture absorbing / releasing fibers and the polyester thermal adhesive fibers in the nonwoven fabric layer are preferably 30 to 80% by mass, 15 to 50% by mass, and more preferably 40 to 70% by mass and 15 to 40% by mass, respectively. is there. If the polyester thermal adhesive fiber content is less than the above, the nonwoven fabric layer tends to be brittle, and if it exceeds the above range, the nonwoven fabric layer tends to become stiff. The single yarn fineness of the polyester heat-adhesive fiber used is not particularly limited, but is preferably 3 to 30 dtex.

  The nonwoven fabric layer may further contain polyester reinforcing fibers at a ratio of preferably 40% by mass at maximum, more preferably 30% by mass at maximum. The polyester reinforcing fiber is added to maintain the strength of the nonwoven fabric layer, and is a polyester fiber that does not melt at the temperature when the polyester heat-bonding fiber is heated. The single yarn fineness of the polyester reinforcing fiber is not particularly limited, but 1 to 10 dtex is preferable. In addition, the nonwoven fabric layer can contain not only the above-mentioned fibers but also other synthetic fibers and functional fibers such as flame retardancy, fungicidal properties, and deodorizing properties.

  As a manufacturing method of the nonwoven fabric layer, various conventionally known methods can be employed. For example, after the constituent fibers of the nonwoven fabric layer are uniformly mixed and opened, a web is formed by a carding method, and this web is formed into a nonwoven fabric by a needle punch method, or after opening, the nonwoven fabric is formed by an airlaid method. It can be obtained by forming. And if necessary, this nonwoven fabric can be cut into an appropriate size after being formed by thermocompression bonding.

The nonwoven fabric layer preferably has a thickness of 2 to 15 mm, more preferably 3 to 13 mm. If the thickness is less than the above range, it is difficult to maintain the shape of the layer, and the function of the moisture absorbing / releasing fiber is not sufficiently exhibited. If the thickness exceeds the above range, there may be a problem in handleability and workability. The nonwoven fabric layer preferably has a basis weight of 800 to 1800 g / m ² , more preferably 850 to 1600 g / m ² . If the basis weight is less than the above range, it is difficult to maintain the shape of the layer, and if it exceeds the above range, it may be too heavy to handle easily.

  The humidity control wall material of the present invention can be produced by laminating a diatomaceous earth-containing layer on a hygroscopic fiber-containing nonwoven fabric layer produced as described above. For example (Please give some specific examples of lamination methods). In addition, when the coupling | bonding between a nonwoven fabric layer and a diatomaceous earth content layer is inadequate, a moisture-permeable binder layer can also be provided among them. An example of such a binder layer is a cellulose binder.

The humidity control wall material of the present invention preferably has a thickness of 3 to 20 mm, more preferably 4 to 15 mm. If the thickness is less than the above range, the wall material becomes brittle, and if it exceeds the above range, there is a possibility that a problem may occur in handling and construction. Tone Shimekabezai of the present invention, basis weight 1000~2500g / ^{m 2,} preferably further is 1200~2000g / ^{m 2.} If the basis weight is less than the above range, the wall material becomes brittle, and if it exceeds the above range, it may be too heavy to be handled easily.

  The humidity control wall material of the present invention can be suitably used for plate-like interior materials such as walls, ceilings, and floors. Actually, the humidity control wall material of the present invention is used with the diatomaceous earth-containing layer disposed on the surface layer (exposed side) and the moisture absorbing / releasing nonwoven fabric layer disposed on the lower layer (wall side). The construction can be performed by appropriately adopting a conventionally known method.

  Although the effect of the humidity control wall material of the present invention is shown by the following examples, the examples are merely illustrative, and the present invention is not limited thereto. In addition, evaluation of the characteristic value in an Example was performed in the following procedures.

(1) Weight per unit area (g / m ² )
A sample having a size of 10 cm × 10 cm was cut out from the wall material. This sample was dried in a hot air dryer at 105 ° C. for 24 hours, and the weight of the sample immediately after that was measured with a balance and converted to a weight per 1 m ² .

(2) Moisture absorption / release capacity (%)
(I) A sample having a size of 10 cm × 10 cm was cut out from the wall material. This sample was dried in a hot air dryer at 105 ° C. for 24 hours, and the sample weight (a (g)) immediately after that was measured with a balance.
(Ii) Next, this sample was allowed to stand for 24 hours in a thermostat at 23 ° C. × 53% relative humidity, and the sample weight (b (g)) immediately after that was measured with a balance.
(Iii) Next, this sample was allowed to stand for 24 hours in a thermostat at 23 ° C. × 75% relative humidity, and the sample weight (c (g)) immediately after that was measured with a balance.
Hygroscopic capacity which the sample weight differences c-b in terms of weight per 1 m ^2, those of the sample weight differences b-a was converted to the weight per 1 m ² was desorption capacity.

(Example 1)
Heat-adhesive fiber (core-sheath polyester fiber having a sheath component of copolymerized polyester having a melting point of 160 ° C. and core component of polyethylene terephthalate having a melting point of 250 ° C., 17 dtex), reinforcing fiber (polyester fiber, 4.4 dtex) , And cross-linked acrylate fiber (Toyobo Co., Ltd. “Moisfine”, 5 dtex, carboxyl group content 6.0 mmol / g) were mixed evenly at 20 wt%, 40 wt%, and 40 wt%, respectively. After opening the fiber, a web was prepared by a card machine, and this web was formed into a nonwoven fabric by the needle punch method. The nonwoven fabric was heat-pressed at a pressure of 3 minutes 3 kg / cm ² at 120 ° C., followed by cooling pressed at a pressure of 2 minutes 3 kg / cm ² at 20 ° C. in a plate shape, which was cut into a predetermined size A nonwoven fabric 1 having a basis weight of 1300 g / m ² and a thickness of 8 mm was obtained. Next, 300 g of clay and 700 g of diatomaceous earth (macropore type (pore diameter of 50 nm or more)) were mixed to prepare an inorganic powder. Into this inorganic powder, 350 g of gypsum, 5 g of glass fiber (thickness 11 μm, length 6 mm), 30 g of methyl cellulose, 120 g of powdered ethylene-vinyl acetate copolymer resin are blended as a binder component, and these are put into a mixer. The mixture was stirred and mixed for 2 minutes, taken out as a uniform composition, and the coating material 1 was prepared. The wall material of Example 1 was obtained by applying and drying the coating material 1 on the nonwoven fabric 1 using a plastering hand so as to have a thickness of 2.5 mm. Table 1 shows the performance evaluation of the obtained wall material.

(Example 2)
In the same manner as in Example 1, a nonwoven fabric 1 and a coating material 1 were prepared. The wall material of Example 2 was obtained by applying and drying the coating material 1 on the nonwoven fabric 1 using a plastering hand so as to have a thickness of 1.5 mm. Table 1 shows the performance evaluation of the obtained wall material.

(Example 3)
In the same manner as in Example 1, a nonwoven fabric 1 and a coating material 1 were prepared. The wall material of Example 3 was obtained by applying and drying the coating material 1 on the nonwoven fabric 1 using a plastering hand so as to have a thickness of 3.5 mm. Table 1 shows the performance evaluation of the obtained wall material.

(Example 4)
A nonwoven fabric 1 was obtained in the same manner as in Example 1. Next, 300 g of clay and 700 g of diatomaceous earth (mesopore type (pore diameter less than 50 nm)) were mixed to prepare an inorganic powder. This inorganic powder is mixed with 350 g of gypsum, 5 g of glass fibers (thickness 11 μm, length 6 mm), 30 g of methylcellulose, and 120 g of powdered ethylene-vinyl acetate copolymer resin, and these are put into a mixer and mixed with stirring for 2 minutes. It was taken out as a uniform composition and the coating material 2 was prepared. The wall material of Example 4 was obtained by applying and drying the coating material 2 on the nonwoven fabric 1 using a plastering hand so as to have a thickness of 2.5 mm. Table 1 shows the performance evaluation of the obtained wall material.

(Example 5)
A nonwoven fabric 1 was obtained in the same manner as in Example 1. Next, 200 g of clay and 800 g of diatomaceous earth (macropore type) were mixed to prepare an inorganic powder. This inorganic powder is mixed with 350 g of gypsum, 5 g of glass fibers (thickness 11 μm, length 6 mm), 30 g of methylcellulose, and 120 g of powdered ethylene-vinyl acetate copolymer resin, and these are put into a mixer and mixed with stirring for 2 minutes. The coating material 3 was prepared by taking out as a uniform composition. The coating material 3 was applied to the nonwoven fabric 1 using a plastering hand so as to have a thickness of 2.5 mm, and dried to obtain the wall material of Example 5. Table 1 shows the performance evaluation of the obtained wall material.

(Example 6)
A nonwoven fabric 1 was obtained in the same manner as in Example 1. Next, 400 g of clay and 600 g of diatomaceous earth (macropore type) were mixed to prepare an inorganic powder. This inorganic powder is mixed with 350 g of gypsum, 5 g of glass fibers (thickness 11 μm, length 6 mm), 30 g of methylcellulose, and 120 g of powdered ethylene-vinyl acetate copolymer resin, and these are put into a mixer and mixed with stirring for 2 minutes. The coating material 4 was prepared by taking out as a uniform composition. The coating material 4 was applied to the nonwoven fabric 1 using a plastering hand so as to have a thickness of 2.5 mm, and dried to obtain a wall material of Example 6. Table 1 shows the performance evaluation of the obtained wall material.

(Example 7)
A wall material of Example 7 was obtained in the same manner as Example 1 except that the basis weight of the nonwoven fabric was 800 g / m ² and the thickness was 5 mm. Table 1 shows the performance evaluation of the obtained wall material.

(Example 8)
A wall material of Example 8 was obtained in the same manner as Example 1 except that the basis weight of the nonwoven fabric was 1800 g / m ² and the thickness was 15 mm. Table 1 shows the performance evaluation of the obtained wall material.

Example 9
Heat-adhesive fiber (core-sheath polyester fiber having a sheath component of copolymerized polyester having a melting point of 160 ° C. and core component of polyethylene terephthalate having a melting point of 250 ° C., 17 dtex), reinforcing fiber (polyester fiber, 4.4 dtex) And cross-linked acrylate fiber (Toyobo Co., Ltd. “Heat lower”, 7 dtex, carboxyl group content 4.0 mmol / g), respectively, except that the proportions were 20 wt%, 30 wt%, and 50 wt%, respectively. In the same manner as in Example 1, a wall material of Example 9 was obtained. Table 1 shows the performance evaluation of the obtained wall material.

(Example 10)
Heat-adhesive fiber (core-sheath polyester fiber having a sheath component of copolymerized polyester having a melting point of 160 ° C. and core component of polyethylene terephthalate having a melting point of 250 ° C., 17 dtex), reinforcing fiber (polyester fiber, 4.4 dtex) In the same manner as in Example 1 except that the ratios of the crosslinked acrylate fibers (Toyobo Co., Ltd. “Moisfine”, 5 dtex) are 20% by weight, 20% by weight, and 60% by weight, respectively. The wall material was obtained. Table 1 shows the performance evaluation of the obtained wall material.

(Example 11)
Heat-adhesive fiber (core-sheath polyester fiber having a sheath component of copolymerized polyester having a melting point of 160 ° C. and core component of polyethylene terephthalate having a melting point of 250 ° C., 17 dtex), reinforcing fiber (polyester fiber, 4.4 dtex) In the same manner as in Example 1, except that the cross-linked acrylate fibers (“Moisfine”, 5 dtex, manufactured by Toyobo Co., Ltd.) are respectively 20% by weight, 60% by weight, and 20% by weight. The wall material was obtained. Table 1 shows the performance evaluation of the obtained wall material.

(Comparative Example 1)
Only the nonwoven fabric 1 of Example 1 was used, and the wall material of Comparative Example 1 was obtained. Table 1 shows the performance evaluation of the obtained wall material.

(Comparative Example 2)
Only the coating material 1 of Example 1 was used, and the wall material of Comparative Example 2 was obtained. Table 1 shows the performance evaluation of the obtained wall material.

(Comparative Example 3)
A wall material of Comparative Example 3 was obtained in the same manner except that the coating material thickness of Example 1 was 5 mm. Table 1 shows the performance evaluation of the obtained wall material.

(Comparative Example 4)
A wall material of Comparative Example 4 was obtained in the same manner except that the coating material thickness of Example 1 was 0.5 mm. Table 1 shows the performance evaluation of the obtained wall material.

  As can be seen from Table 1, Examples 1 to 11 that satisfy the constituent requirements of the present invention all exhibit high moisture absorption and desorption capacity. On the other hand, Comparative Example 3 in which the thickness of the diatomaceous earth-containing layer is too large takes too much time for moisture to move to the nonwoven fabric layer, so that moisture absorption / release is inhibited and only a low moisture absorption / release capacity is obtained. Absent. In Comparative Example 1 having no diatomaceous earth-containing layer and Comparative Example 4 in which the thickness of the diatomaceous earth-containing layer is too small, the surface of the wall material suddenly becomes saturated, and diffusion is unlikely to occur. Only moisture release capacity can be obtained. Moreover, since the comparative example 2 which does not have a nonwoven fabric layer cannot absorb a lot of moisture, only a remarkably low moisture absorption / release capacity is obtained.

  The humidity control wall material of the present invention is lightweight, excellent in workability, has high moisture absorption / release properties, and can appropriately cope with moisture absorption / release environments with a long-term cycle. Very useful for humidity control.

Claims (12)

  A moisture conditioning wall material configured to arrange a diatomite-containing layer on the surface and a hygroscopic fiber-containing non-woven fabric layer to the lower layer, and using a crosslinked acrylate fiber as the hygroscopic fiber, and diatomaceous earth A humidity control wall material wherein the thickness of the containing layer is 1 to 4 mm.   The humidity control wall material according to claim 1, wherein the nonwoven fabric layer contains 10 to 80 mass% of hygroscopic fibers.   The humidity control wall material according to claim 1, wherein the crosslinked acrylate fiber has a carboxyl group of 0.1 to 10 mmol / g.   The humidity control wall material according to any one of claims 1 to 3, wherein the nonwoven fabric layer contains polyester heat-adhesive fibers in addition to moisture-absorbing and releasing fibers.   The moisture control wall material according to claim 4, wherein the content ratios of the moisture absorbing / releasing fibers and the polyester thermal adhesive fibers in the nonwoven fabric layer are 30 to 80% by mass and 15 to 50% by mass, respectively.   The humidity control wall material according to claim 4 or 5, wherein the nonwoven fabric layer further contains up to 40% by mass of a polyester reinforcing fiber.   The humidity adjusting wall material according to any one of claims 1 to 6, wherein the diatomaceous earth-containing layer contains 30 to 60 mass% of diatomaceous earth.   The humidity control wall material according to any one of claims 1 to 7, wherein the humidity control wall material has a total thickness of 3 to 20 mm.   The moisture control wall material according to any one of claims 1 to 8, wherein the hygroscopic fiber-containing nonwoven fabric layer has a thickness of 2 to 15 mm.   The humidity adjusting wall material according to any one of claims 1 to 9, wherein the diatomite-containing layer has a thickness of 1 to 3.5 mm. Hygroscopicity fiber-containing nonwoven layer Shimekabe material adjustment according to any of claims 1 to 10 weight per unit area is characterized by a 800~1800g / ^{m 2} of.   The moisture control wall material according to any one of claims 1 to 11, wherein a moisture permeable binder layer is provided between the diatomaceous earth-containing layer and the hygroscopic fiber-containing nonwoven fabric layer.