JP2003011259A - Inorganic board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inorganic board having a sufficient strength to be used as a wall material while a heat insulation and a sound absorbing qualities are maintained good. SOLUTION: The inorganic board 10 comprises a rock wool board 12, glass fiber nonwoven fabrics 14 disposed on both side surfaces of the board 12, and a resin disposed in a boundary therebetween. In this board 10, the resin is impregnated into a part of the board 12 and the overall glass fiber nonwoven fabric 14. Since the resin is thus impregnated, the strength of the board 10 is improved. Since the resin is not impregnated into a central part of the board 12, the board 12 can maintain the heat insulation and the sound absorbing qualities originally incorporated in the board 12 good due to the presence of a layer 12B at the central part in which the resin is not impregnated. Since the carbon fibers are contained in the board 12 and the nonwoven fabric 14, its electromagnetic wave absorbing characteristics and shielding characteristics are significantly improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic board as an interior material used as a wall material, a ceiling material or a floor material of a house, a building or the like.

[0002]

2. Description of the Related Art Conventionally, gypsum board, calcium silicate board and the like have been widely used as wall materials and ceiling materials for houses and buildings.

However, where the wall material is required to have heat insulating properties and sound absorbing properties, both gypsum board and calcium silicate board are inferior in terms of heat insulating properties and sound absorbing properties. It should be noted that wood, which has been used for houses and the like from the past, has a good heat insulating property, but is very expensive, and easily burns and is inferior in terms of fire resistance.

In order to improve the above heat insulation and sound absorption,
In recent years, inorganic fiber boards such as rock wool have been proposed and used as ceiling materials.

[0005]

However, since the inorganic fiber board such as rock wool is inferior in strength to gypsum board, calcium silicate board and the like, it is unsuitable for use as a wall material.

The present invention has been made to solve the above problems, and provides an inorganic board having sufficient strength for use as a wall material while maintaining good heat insulation and sound absorption. The purpose is to do.

[0007]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the inventor has arranged a glass fiber nonwoven fabric or a glass fiber woven fabric on both sides of a mineral fiber board, and arranging a resin at the boundary between them. It was found that the strength of the inorganic board was improved by the impregnation. The present invention is based on the above findings.

That is, the inorganic board according to the present invention includes a mineral fiber board, a glass fiber nonwoven fabric or a glass fiber woven fabric arranged on both sides of the mineral fiber board, the mineral fiber board and the glass fiber nonwoven fabric or glass. And a resin arranged at the boundary with the fiber fabric, wherein the resin is
A part of the mineral fiber board and the glass fiber nonwoven fabric or the glass fiber woven fabric are impregnated.

In this inorganic board, the strength is improved by impregnating the resin into the glass fiber non-woven fabric or the glass fiber woven fabric disposed on a part of the mineral fiber board and both surfaces thereof. Further, the resin impregnates not only the entire mineral fiber board but a part of the mineral fiber board from the boundary, and the central portion of the mineral fiber board concerned does not impregnate the resin with the mineral fiber board. Due to the presence of the board layer, the heat insulation and sound absorption inherent to the mineral fiber board can be well maintained.

As described above, according to the inorganic board of the present invention, it is possible to realize sufficient strength for use as a wall material while maintaining good heat insulation and sound absorption.

Further, the inorganic board according to the present invention may be characterized in that the resin is impregnated to the outer surface of the glass fiber nonwoven fabric or the glass fiber fabric. In the case of this configuration, the outer surface of the glass fiber nonwoven fabric or the glass fiber woven fabric, that is, the smoothness of the surface of the inorganic board is improved,
Its surface hardness is also improved. In addition, it is possible to prevent the inconvenience that a waterproof effect is generated on the surface and mold is generated on the surface.

The inorganic board according to the present invention may be characterized in that the mineral fiber board contains conductive fibers. In this case, the electromagnetic wave shielding property and electromagnetic wave absorbing property of the inorganic board can be improved. , Wireless LAN (Lo
It is possible to contribute to the improvement of the long-awaited indoor electromagnetic environment due to the spread of cal area networks.

The inorganic board according to the present invention may be characterized in that the glass fiber nonwoven fabric or the glass fiber woven fabric contains conductive fibers, and in this case also, the electromagnetic wave shielding property and electromagnetic wave absorbing property of the inorganic board are improved. Therefore, it is possible to contribute to the improvement of the indoor electromagnetic environment, which has been long-awaited with the spread of wireless LAN. Further, such an effect is not limited to the case where the conductive fiber is contained in both the glass fiber nonwoven fabric or the glass fiber fabric arranged on both sides of the mineral fiber board, and the glass fiber nonwoven fabric or the glass fiber fabric on one side is not limited to the case. It can be obtained by containing conductive fibers and arranging such that the side containing the conductive fibers faces the side opposite to the living space, that is, the outdoor side.

More preferably, it is desirable to include conductive fibers in both layers of the mineral fiber board and the glass fiber non-woven fabric or the glass fiber woven fabric. In this case, not only the electromagnetic waves are attenuated in each layer, The reflected waves from each layer interfere with each other and cancel each other out due to the relationship between the phase and the amplitude, that is, they are attenuated by resonance, so that the electromagnetic wave shielding property and electromagnetic wave absorbing property can be dramatically improved, and the wireless This can greatly contribute to the improvement of the indoor electromagnetic environment, which has been long-awaited with the spread of LAN.

When the glass fiber non-woven fabric or the glass fiber woven fabric contains conductive fibers and is bonded to both sides of the mineral fiber board, good electromagnetic wave shielding property is obtained even when the conductive fiber is not contained in the mineral fiber board. Therefore, it is possible to shield unnecessary incoming waves from the outside, prevent leakage of indoor radio waves, and prevent interference of wireless communication. Needless to say, the effect is further improved when the conductive fiber is contained in the mineral fiber board.

Rock wool board can be used as the mineral fiber board constituting the above-mentioned inorganic board according to the present invention. The rock wool board has excellent heat insulating properties and sound absorbing properties, and also has the advantage of being lightweight. Therefore, by improving the strength by the constitution of the present invention, an inorganic board useful as a wall material can be obtained.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the inorganic board according to the present invention will be described below.

[Structure of Inorganic Board] FIG. 1 is a sectional view schematically showing the structure of the inorganic board 10 in this embodiment. The inorganic board 10 includes a rock wool board 12 having non-combustibility, sound absorption, and heat insulation as an example of a mineral fiber board, and glass fiber nonwoven fabrics 14A and 14B bonded from both sides thereof, and a boundary between them. The glass fiber nonwoven fabrics 14A and 14B and a part of the rock wool board 12 are impregnated with a resin centering on the portion. That is, the rock wool board 12 has a resin-impregnated portion 12A and a resin-impregnated portion 1A.
2B are formed.

The inorganic board 10 is manufactured as follows, for example. That is, 0.1 ~ from the set thickness
Glass fiber non-woven fabrics 14A and 14B impregnated with resin as a reinforcing effect are bonded from both sides of the rock wool board 12 by hot pressing, using the rock wool board 12 having an excessive thickness of 1.5 mm as a base material. At the time of bonding, the portion where the excessively thick rock wool board 12 buckles is impregnated with the resin melted by the pressing temperature. As a result, in the rock wool board 12, a strong layer 12A was formed near the boundary with the glass fiber nonwoven fabrics 14A and 14B, and the rock wool board 12 was formed with the skin layer composed of the glass fiber nonwoven fabrics 14A and 14B. A quasi-five-layer structure having no difference in strength with the base material is formed.

By adopting such a structure, it is possible to realize sufficient strength for use as a wall material while maintaining the heat insulation and sound absorption originally possessed by the rock wool board 12 in good condition. In addition, resin is used as the glass fiber non-woven fabric 1
Since the outer surface of 4A and 14B is impregnated,
It is possible to improve the surface smoothness of the inorganic board 10 and also improve its surface hardness. In addition, it is possible to prevent the inconvenience that the surface is waterproofed and mold is generated on the surface.

As the inorganic board 10, the rock wool board 12 having an electromagnetic wave absorbing property is adopted, and the glass fiber non-woven fabric 14B added with carbon fiber as an example of the conductive fiber is adopted. The glass fiber nonwoven fabric 14B is arranged on the side opposite to the living space, that is, toward the outdoor side.

As a result, the electromagnetic wave shielding property and electromagnetic wave absorbing property of the inorganic board 10 can be improved, and the wireless L
It can contribute to the improvement of the indoor electromagnetic wave environment that has been long-awaited with the spread of AN.

In particular, since carbon fibers are contained in both layers of the rock wool board 12 and the glass fiber nonwoven fabric 14B, not only the electromagnetic waves are attenuated in each layer, but also the reflected waves from each layer interfere with each other. And they cancel each other out due to the relationship between the phase and the amplitude, that is, they are also attenuated by resonance. Therefore, the electromagnetic wave shielding property and the electromagnetic wave absorbing property can be dramatically improved, and the wireless LA
The spread of N can greatly contribute to the improvement of the long-awaited indoor electromagnetic wave environment.

When both the glass fiber non-woven fabrics 14A and 14B contain carbon fibers, even if the rock wool board 12 does not contain carbon fibers, it has good electromagnetic wave shielding properties and prevents unwanted incoming waves from outside. It is possible to achieve shielding, prevention of indoor electromagnetic wave leakage, and prevention of wireless communication interference.

The inorganic board 10 may be made of glass fiber woven fabric instead of the glass fiber nonwoven fabrics 14A and 14B. In this embodiment, an example using a glass fiber nonwoven fabric will be described.

[Composition of Inorganic Board 10] As an example, the inorganic board 10 can be configured as follows.

That is, the inorganic board is rock wool 67-
92% and beaten pulp 0.5 to 5.0% by weight, organic resin binder 2 to 13% by weight, natural mineral fiber 0.5 to 10% by weight, organic polymer resin and inorganic salt coagulant 0.15 to 1% by weight
Rock wool board 12 obtained by wet-paper-making a water-dispersed slurry of a mixture in which the solid content is 50 to 300 g / m 2.
The glass fiber non-woven fabric 14 having a basis weight of 25 to 100 g / m ² impregnated with the resin ² can be laminated by hot pressing.

The inorganic board is made of carbon fiber having a fiber length of 1 to 30 mm and a conductive substance of 0.02 to 1% by weight.
It can be constructed by laminating a glass fiber nonwoven fabric 14 having a basis weight of 25 to 100 g / m ² impregnated with a resin having a solid content of 50 to 300 g / m ² with a hot press to the same wet papermaking rock wool board 12 containing . This inorganic board is excellent in electromagnetic wave absorption.

Further, with respect to the same wet papermaking rock wool board 12 containing 0.02 to 1% by weight of a conductive substance composed of carbon fibers having a fiber length of 1 to 30 mm, the solid content on the indoor side is
50 to 300 glass fiber nonwoven fabric 14 g / m ² of resin impregnated basis weight 25 to 100 g / m ² laminated by hot pressing, a conductive material made of carbon fiber having a fiber length 1~30mm the outdoor side the 5 to 30 g / m ² in Appendix to the glass fiber nonwoven fabric 14 having a basis weight 25~100g / m ² impregnated with resin solid content 50 to 300 g / m ² can be constructed by bonding by hot press. This inorganic board is excellent in terms of electromagnetic wave shielding and absorption.

It is also preferable to add an additive such as an inorganic filler in an amount of 60% by weight or less in a form of replacing the rock wool blended as the main component of the rock wool board.

[Rockwool Board Used in Inorganic Board] The rockwool board of the present invention will be described below. The rock wool that constitutes the base material is known as slag wool and mineral wool,
It is obtained by melting a raw material mineral mixture in a cupola or an electric furnace and making it into fibers by a blowing method or a spinning method using a high-speed rotating body. The fibers are preferably wool-like and have a fiber length of several millimeters to several tens of millimeters.

The ratio of rock wool to be blended is appropriately in the range of 67 to 92% by weight in terms of nonflammability, sound absorption and strength. The reason is that if it is less than 67% by weight, the ratio of the organic bond is relatively large, so the nonflammable sound absorbing property is impaired, and
This is because if the amount exceeds 5% by weight, the ratio of the amount of organic bonds becomes relatively small and the strength of the interior wall material becomes insufficient.

The blending ratio of the beaten pulp is 0.5 in terms of nonflammability, drainage during papermaking, and strength as a wall material for interior.
A range of up to 5% by weight is appropriate. This is because if it is less than 0.5% by weight, the strength of the wall material is insufficient, and if it exceeds 5% by weight, the incombustibility and the drainage property at the time of production are deteriorated, and the fire resistance and the productivity are impaired.

Substances used as the organic binder include starch, polyvinyl alcohol, polyethylene,
Powder of paraffin, phenol resin, melamine resin,
Thermosetting powder resin such as epoxy resin or acrylic resin,
Examples thereof include organic binders such as emulsions of modified acrylic resin, polyvinyl acetate, ethylene / acetic acid copolymer resin, polyvinylidene chloride resin, modified vinylidene chloride resin, epoxy resin and urethane resin. The content of these organic binders is related to nonflammability and strength.
2 to 13% by weight is appropriate. This is because if it exceeds 13% by weight, the incombustibility is impaired, and if it is less than 2% by weight, the bending strength becomes insufficient. However, the organic binder can be added in an amount of 13 to 20% by weight by adding a flame retardant such as aluminum hydroxide in the form of replacing rock wool.

It is preferable to add a small amount of an aggregating agent such as polyacrylamide or a sulfuric acid band that effectively retains the organic binder. Further, the blending amount of the polymer flocculant is preferably in the range of 0.15 to 1% by weight from the viewpoint of strength effect and nonflammability.

Further, for the purpose of improving strength, dimensional stability and resistance to moisture deflection, it is necessary to add natural mineral fibers such as attapulgite and ceviolite, and the drainage and strength which are involved in productivity during wet papermaking are Due to this, the range of 0.5 to 10% by weight is appropriate. This is because if it exceeds 10% by weight, the drainage time becomes long and the productivity is impaired, and if it is less than 0.5% by weight, the dimensional stability and the moisture flexing resistance become insufficient.

Further, in order to impart water repellency, it is necessary to add a small amount of water repellent such as wax emulsion and silicone resin emulsion. The mixing ratio of the water repellent is preferably in the range of 0.1 to 1.0% by weight in view of the relationship between water repellency, strength and nonflammability.

By the way, the present embodiment is characterized in that the inorganic board is provided with electromagnetic wave absorbing performance. A fibrous conductive material is included as a component that imparts the electromagnetic wave absorbing performance. This fibrous conductive material is PA
N-type and Pitch-type carbon fiber one with a fiber length of 1
The preferred range is -30 mm, and typical examples thereof include Zyrus manufactured by Osaka Gas Co., Ltd., trading card manufactured by Toray Co., Ltd., and Bethfight manufactured by Toho Rayon Co., Ltd. The above range is preferably used as the fiber length because the longer the fiber length of the carbon fiber, the better the electromagnetic wave absorption performance with a smaller amount of the compound, while the carbon fiber is dispersed in water and stirred during papermaking molding. Since the entanglement dispersibility deteriorates and the electromagnetic wave absorption performance is deteriorated, the fiber length is preferably 30 mm or less,
On the other hand, if the thickness is less than 1 mm, the dielectric loss effect, which is the principle of electromagnetic wave absorption, is difficult to be obtained although the dispersibility is not a problem, and the electromagnetic wave absorption performance is deteriorated.

The blending ratio of the carbon fiber is 0.
A good electromagnetic wave absorption performance is exhibited at 02% by weight or more, but 1
When the content is more than weight%, the electromagnetic wave reflectance characteristics are improved too much and the electromagnetic wave absorption performance is deteriorated. Therefore, the content is preferably in the range of 0.02 to 1 weight%. The blended carbon fiber acts as a dielectric, causing electromagnetic wave energy loss due to dielectric loss in the frequency band of gigahertz or higher, and exhibiting desired electromagnetic wave absorption performance.

As the resin with which the glass fiber nonwoven fabric is impregnated, a thermosetting resin such as phenol resin, melamine resin, urea resin or epoxy resin is used. An appropriate impregnation amount is 75 to 300 g / m ² . This is because, 75 g / m ² can not be exhibited, the strength of the wall material to obtain the following resin impregnation part boundary layer between the boards is glass fiber nonwoven fabric is easily peeled off can not be formed, nonflammable at 300 g / m ² or more Because there is a problem with it and it is not economical. In order to improve the adhesiveness with the glass fiber nonwoven fabric, it is also effective to add an adhesiveness improver such as a silane coupling agent in an amount of 0.1 to 2% by weight with respect to the resin.

The glass fiber non-woven fabric has a basis weight of 25 to 100 g /
It is preferable to use m ^{2 having} a fiber length of 1 to 5 cm and a fiber diameter of 6 to 15 μm. This is because the required strength cannot be exhibited when the basis weight is 25 g / m ² or less, and it becomes difficult to impregnate the resin with an appropriate amount when the basis weight is 100 g / m ² or more. Also, if the fiber length is 1 cm or less, the required strength cannot be exhibited, and if the fiber length is 5 cm or more, there is a problem in manufacturing a nonwoven fabric. Further, if the fiber diameter is 6 μm or less, it is not economical, and if it is 15 μm or more, there is a possibility that a tingling sensation may occur when the product is touched.

In the case of the electromagnetic wave shielding type, it is preferable to mix 0.8 to 30 g / m ^{2 of a} conductive material made of carbon fiber having a fiber length of 1 to 30 mm into a glass fiber nonwoven fabric. Because 0.8g
If it is less than / m ^2, it will not be able to exhibit sufficient electromagnetic wave reflection characteristics and
This is because the electromagnetic wave reflection characteristics do not improve so much with respect to the mixed paper amount and the cost is uneconomical when m ² or more.

It is preferable that a glass fiber nonwoven fabric is impregnated with a resin by a roll coater, a bar coater or the like, and after impregnation, air-dried by heat of 100 to 140 ° C. to obtain a prepreg having a water content of 2 to 10% by weight. This is because when the water content is 2% by weight or less, the reaction of the resin progresses, the pot life of the resin becomes short, and it is 10% by weight.
This is because the so-called blocking phenomenon may occur in which the resin-impregnated glass fiber nonwoven fabrics are stuck to each other during storage.

Prior to making the composite, it is preferred that the rockwool board has an excess thickness of 0.1-1.5 mm above the set thickness. This is because if the thickness is 0.1 mm or less, in the case of compounding, if there is a variation in the thickness of the pressing surface or the board, there is a concern that there will be defective adhesion between the glass fiber nonwoven fabric and the rock wool board. If it is 1.5 mm or more, the buckling part of the board is too large, and the resin does not sufficiently penetrate into the part.

The composite is manufactured by hot pressing a rock wool board and a resin-impregnated glass fiber non-woven fabric. The pressing temperature is preferably in the range of 160 to 250 ° C. Because, at 160 ° C. or lower, heat melting of the resin does not proceed, and impregnation into the rock wool board becomes insufficient. Since the curing of the resin does not proceed, there is a problem in productivity and the strength of the resin does not appear. At 250 ° C. or higher, there is a concern that the resin may deteriorate, and the reaction may be too fast, causing uneven curing.

[0046]

[Example] [Verification of strength, heat insulation and fire resistance] Thickness 9 mm
By using the rock wool board of No. 2 as a core material and the glass fiber nonwoven fabric as a unit with a resin, the strong boards of Examples 1 and 2 were obtained without impairing the fire resistance as described below. The composition of the rock wool boards of Examples 1 and 2 was as follows: rock wool 89.8% by weight, beaten pulp 1.0% by weight,
5.5% by weight organic resin binder, 2.9 natural mineral fibers
Coagulant consisting of weight% organic polymer resin and inorganic salt 0.
It was set to 8% by weight.

[Example 1] Example 1 is an inorganic board in which glass fiber nonwoven fabric is bonded to both sides of a rock wool board having a thickness of 9 mm and integrally molded with a resin at a pressing temperature of 200 ° C. The basis weight of the glass fiber non-woven fabric was 50 g / m ² , and the amount of impregnated resin per side was 60 g / m ² .

[Example 2] Example 2 is an inorganic board in which a glass fiber non-woven fabric is laminated on both sides of a rock wool board having a thickness of 9 mm and integrally molded with a resin at a pressing temperature of 200 ° C. The basis weight of the glass fiber nonwoven fabric was 40 g / m ² , and the amount of impregnated resin per side was 80 g / m ² .

Comparative Example 1 The inorganic board of Comparative Example 1 is
It is composed only of rock wool board with a thickness of 9 mm, and is not laminated with glass fiber non-woven fabric or impregnated with resin.

Comparative Example 2 The inorganic board of Comparative Example 2 is
The surface of the rock wool board having a thickness of 9 mm was not impregnated with the glass fiber nonwoven fabric, but the surface was impregnated with resin, and the impregnated resin amount per one side was 120 g / m ² .

For each of the above-mentioned Examples 1 and 2 and Comparative Examples 1 and 2, the bending strength and the water absorption bending strength after soaking in water for 2 hours and the thermal resistance value were measured, and the fire resistance was examined. The results shown in Table 2 were obtained. As shown in the table of FIG. 2, the bending strength of Comparative Example 1 was 30 kg / cm ² and that of Comparative Example 2 was 50 kg / cm ² , whereas both Examples 1 and 2 were 70 kg / cm ² . It can be seen that the structure according to the present invention increased the bending strength.

[0052] Similarly, the 2-hour water absorption flexural strength after immersion in water, whereas Comparative Example 1 5 kg / cm ^2, the Comparative Example 2 was 20 kg / cm ^2, the Example 1 40 kg / cm ² ,
In Example 2, the pressure was 50 kg / cm ² , and it can be seen that the water absorption bending strength was also increased by the configuration according to the present invention.

[0053] On the other hand, the thermal resistance value, Comparative Example 1 is 0.18 m ² K / W, where Comparative Example 2 is 0.20 m ² K / W, Examples 1 and 2 0 both same as Comparative Example 1 .18m ² K / W
Thus, it can be seen that the configurations according to the examples maintain the excellent heat insulating property of the rock wool board.

Regarding fire resistance, when Comparative Example 1 was judged to be non-combustible and Comparative Example 2 was judged to be quasi non-combustible, both Examples 1 and 2 were judged to be the same non-combustible as Comparative Example 1 and It can be seen that such a structure maintains the excellent fire resistance provided by the rock wool board.

As described above, it can be seen that in Examples 1 and 2, the bending strength was significantly enhanced while the heat insulating property and the fireproof property were maintained well.

Next, a rock wool board having a thickness of 12 mm was used as a core material, and a glass fiber non-woven fabric was integrated with a resin, so that the strong boards of Examples 3 and 4 were obtained without impairing the fire resistance as follows. was gotten. In addition, Examples 3 and 4
The composition of the rock wool board was 87.2 wt% rock wool, 2.0 wt% beating pulp, 7.0 wt% binder, 3.0 wt% natural mineral fiber, and 0.8 wt% coagulant.

[Example 3] Example 3 is an inorganic board in which glass fiber nonwoven fabric is bonded to both sides of a rock wool board having a thickness of 12 mm and integrally molded with a resin at a pressing temperature of 200 ° C. The basis weight of the glass fiber nonwoven fabric was 50 g / m ² , and the amount of impregnated resin per one side was 100 g / m ² .

[Example 4] Example 4 is an inorganic board in which glass fiber nonwoven fabric is bonded to both sides of a rock wool board having a thickness of 12 mm and integrally molded with a resin at a press temperature of 200 ° C. The basis weight of the glass fiber nonwoven fabric was 40 g / m ² , and the amount of impregnated resin per side was 120 g / m ² .

Comparative Example 3 The inorganic board of Comparative Example 3 is
It is composed only of rock wool board having a thickness of 12 mm, and is not subjected to any bonding of glass fiber non-woven fabric and resin impregnation.

For each of Examples 3 and 4 and Comparative Example 3 described above, the bending strength was measured by measuring the water absorption bending strength after soaking in water for 2 hours, and the fire resistance was inspected. Results were obtained. As shown in the table of FIG. 3, the flexural strength of Comparative Example 3 was 50 kg / cm ² , whereas
It was 100 kg / cm ^{2 in} Examples 3 and 4, and it can be seen that the bending strength was increased by the structure according to the present invention.

Similarly, regarding the water-absorption bending strength after being immersed in water for 2 hours, Comparative Example 3 was 20 kg / cm ² , whereas Example 3 was 50 kg / cm ² and Example 4 was 60 kg. / cm ²
Therefore, it can be seen that the water absorption bending strength was also increased by the configuration according to the example.

On the other hand, with respect to fireproofness, all of Comparative Example 3 and Examples 3 and 4 were judged to be quasi-incombustible, and there was no inconvenience that the fireproofness was particularly deteriorated by the configuration according to the example.

As described above, it can be seen that in Examples 3 and 4, the bending strength was significantly enhanced while the fireproof property was maintained well.

[Verification of Sound Absorption] The sound absorption coefficient of the small reverberation room method for sounds of various frequencies was measured using the inorganic board and the calcium silicate board having the rock wool board according to the present invention as the core material, and the sound absorption coefficient of FIG. The results shown in the graph were obtained.

The inorganic board has a thickness of 12 mm and a specific gravity of 0.42, and the calcium silicate plate has a thickness of 12 mm and a specific gravity of 0.90. The size of each specimen is 910 mm x 1320
mm.

As is clear from the graph of FIG. 4, the small reverberation room sound absorption coefficient of the inorganic board is higher than that of the calcium silicate board at any frequency. Is compared to the calcium silicate plate
It can be seen that it has a good sound absorbing performance.

[Verification of Electromagnetic Wave Absorption] The present invention provides one or both of a rock wool board and a glass fiber nonwoven fabric,
By containing a conductive fiber (for example, carbon fiber), the electromagnetic wave absorption characteristics and electromagnetic wave shielding characteristics of the entire inorganic board are improved, but this is verified as follows,
The results shown in the table of FIG. 5 were obtained. In addition, in FIG. 5, carbon fiber was described as CF.

[Example 5] The applicant of the present invention invented a technique for improving the electromagnetic wave absorption property and the electromagnetic wave shielding property of the rock wool board by incorporating the conductive fiber into the rock wool board, and has already applied for a patent. ing. In this example, a rock wool board containing carbon fibers as conductive fibers was used as a core material, and an ordinary glass fiber non-woven fabric containing no carbon fibers was bonded from both sides to the inorganic board as Example 5.

The composition of the core material is rock wool 89.6.
%, Beaten pulp 1.0% by weight, binder 5.5% by weight, natural mineral fiber 2.85% by weight, coagulant 0.8% by weight, carbon fiber 0.25% by weight. The amount of impregnated resin is 100g / m
^2. The basis weight of the glass fiber non-woven fabric is 40 g / m ² .

Example 6 A rock wool board containing carbon fibers as conductive fibers was used as a core material,
Ordinary glass fiber non-woven fabric that does not contain carbon fiber is attached from one side,
Example 6 was an inorganic board in which a 0% glass fiber non-woven fabric was attached from the other side. Incidentally, this Example 6 also has the same composition as that of Example 5, and the amount of impregnated resin is 100.
g / m ² , and the basis weight of the glass fiber non-woven fabric is 40 g / m ² .

Example 7 A rock wool board having no conductive fiber was used as a core material and carbon fiber was 30%.
Example 7 was an inorganic board in which the contained glass fiber nonwoven fabric was bonded from both sides. In addition, this Example 7
Has the same composition as in Example 5 except for carbon fiber, the impregnating resin amount is 100 g / m ² , and the basis weight of the glass fiber nonwoven fabric is 40 g / m ² .

The measurement results of the electromagnetic wave characteristics of Examples 5, 6 and 7 are shown in the lower end of the table of FIG. In Example 5,
4.5 dB for electromagnetic waves with a frequency of 2.4 GHz, that is,
An absorption characteristic of 65% was observed, and an absorption characteristic of 6.5 dB, that is, 78% was observed for an electromagnetic wave having a frequency of 5.2 GHz.

Further, a shielding characteristic of 4.5 dB, that is, 65% is observed with respect to the electromagnetic wave of frequency 2.4 GHz, and 5.5 dB, that is, 72% with respect to the electromagnetic wave of frequency 5.2 GHz.
The shielding property of was observed.

On the other hand, in the sixth embodiment, the frequency is 2.4 GHz.
The resonance effect was confirmed for the electromagnetic waves of 15 dB, that is, 9
A high absorption characteristic of 7% was observed, and a high absorption characteristic of 7.5 dB, that is, 82% was observed even for an electromagnetic wave having a frequency of 5.2 GHz.

Further, an extremely high shielding property of 25 dB, that is, 99.7% is observed for an electromagnetic wave of frequency 2.4 GHz, and an extremely high shielding property of 28 dB, that is, 99.8% is observed for an electromagnetic wave of frequency 5.2 GHz. Characteristics were seen.

On the other hand, in Example 7 used as a shield, it was 31 dB for electromagnetic waves of frequency 2.4 GHz, that is, 9
An extremely high shielding property of 9.9% was observed.

It is well known that the calcium silicate plate conventionally used as the core material has no electromagnetic wave absorption / shielding, but in the structure according to the present invention, only the rock wool board of the core material as in Example 5 is used. Even when the carbon fiber was contained in the above, a high electromagnetic wave absorption / shielding property of 65% or more was obtained, and the carbon fiber was contained in the rock wool board as the core material and the glass fiber nonwoven fabric on one side as in Example 6. In this case, a high electromagnetic wave absorption property of 82% and an extremely high electromagnetic wave shielding property of 99% or more are obtained,
It was also found that even when the core material does not contain carbon fiber as in Example 7, when the glass nonwoven fabric on both sides contains carbon fiber, extremely high electromagnetic wave shielding characteristics of 99.9% or more can be obtained.

As described above, in the structure according to the present invention, it is possible to obtain an effect that high electromagnetic wave absorption / shielding characteristics are obtained.

[0079]

As described above, according to the present invention,
The resin is impregnated into the glass fiber non-woven fabric or the glass fiber woven fabric arranged on a part of the mineral fiber board and both surfaces thereof while leaving a layer of the mineral fiber board not impregnated with the resin in the center of the mineral fiber board. Since the structure is adopted, it is possible to realize sufficient strength for use as a wall material while maintaining good heat insulation and sound absorption of the mineral fiber board.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of an inorganic board according to an embodiment of the invention.

FIG. 2 is a table showing comparison results of strength data and the like between Examples 1 and 2 according to the present invention and Comparative Examples 1 and 2.

FIG. 3 is a table showing comparison results of strength data and the like between Examples 3 and 4 according to the present invention and Comparative Example 3.

FIG. 4 is a graph showing the difference in sound absorption between the inorganic board and the calcium silicate board according to the present invention.

FIG. 5 is a table showing measurement results of electromagnetic wave absorption performance of the inorganic board according to the present invention.

[Explanation of symbols]

10 ... Inorganic board, 12 ... Rock wool board, 14
… Glass fiber non-woven fabric.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideyuki Hatanaka             210 Nitto Spinning, Rokukatacho, Inage-ku, Chiba-shi, Chiba Prefecture             Chiba factory (72) Inventor Hidetoshi Kojima             210 Nitto Spinning, Rokukatacho, Inage-ku, Chiba-shi, Chiba Prefecture             Chiba factory F-term (reference) 4F100 AC00A AC10A AG00B AG00C                       AK01D AK01E BA05 BA06                       BA07 BA10B BA10C DG01A                       DG12B DG12C DG15B DG15C                       EJ82D EJ82E GB08 JG01A                       JG01B JG01C JH01 JJ02                       JK01

Claims (5)

[Claims] 1. A mineral fiber board, a glass fiber non-woven fabric or a glass fiber fabric arranged on both sides of the mineral fiber board, and a boundary part between the mineral fiber board and the glass fiber non-woven fabric or glass fiber fabric. And a resin that impregnates a part of the mineral fiber board and the glass fiber nonwoven fabric or the glass fiber woven fabric with the resin. 2. The inorganic board according to claim 1, wherein the resin impregnates even the outer surface of the glass fiber nonwoven fabric or the glass fiber fabric. 3. The inorganic board according to claim 1 or 2, wherein the mineral fiber board contains conductive fibers. 4. The conductive fiber is contained in at least one of the glass fiber nonwoven fabric and the glass fiber fabric arranged on both sides of the mineral fiber board. The inorganic board according to item 1. 5. The inorganic board according to any one of claims 1 to 4, wherein the mineral fiber board is a rock wool board.