JP2012066556A - Noncombustible decorative board and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noncombustible decorative board which conforms to "a noncombustible material" shown by Paragraph 9 of Section 2 of the Building Standards Law and also is a few in amount of warpage.SOLUTION: The noncombustible decorative board has a laminated body which has two or more layers of a sheet material for a core material layer having a glass-fiber non-woven fabric as a core material, and in which a sheet material for reinforcing layers containing a thermosetting resin in the glass-fiber non-woven fabric is inserted between the sheet materials for the core material layer; and a sheet material for a decorative layer on the surface of the laminated body; which are lamination integrated; wherein the sheet materials for the core material layer is obtained by forming a nonflammable layer consisting of a nonflammable metal hydroxide on the surface of the glass fiber non-woven fabric.

Description

  The present invention relates to a non-combustible decorative board and a method for producing a non-combustible decorative board.

  Conventional flame-resistant decorative boards such as flame-retardant or non-flammable decorative boards are often difficult to process, require impact resistance, or are made of inorganic materials such as asbestos. In addition, in the resin-based decorative board, in order to impart nonflammability, a large amount of inorganic substance of 85% by weight or more has been conventionally added. For this reason, the resin and the inorganic substance are dispersed and mixed, and the obtained varnish is applied. Or the manufacturing technique for coating was difficult.

  On the other hand, the Building Standards Act was revised in 2000, and the nonflammable material test of Article 2-9 of the Building Standards Act was changed from the surface combustion test and the base material combustion test to the corn calorimeter exothermic test and the gas toxicity test. It was. Along with this, incombustible materials with low calorific value have been required. Therefore, it is difficult to obtain the “non-combustible material” certification with the conventional resin-based flame-resistant decorative board. As a method corresponding to the non-combustible material, there is a method of impregnating a glass fiber nonwoven fabric with a filler mainly composed of a phenol resin and inorganic particles (see, for example, Patent Document 1), but the inorganic particles cannot be sufficiently retained. In addition, there is a disadvantage that the non-flammability is not exhibited and the flame-resistant decorative board tends to warp in a dry atmosphere.

JP-A-8-207201

  In view of the above situation, the present invention provides a non-combustible decorative board that conforms to the “non-combustible material” referred to in Article 2-9 of the Building Standard Law and has a small amount of warpage.

This invention is comprised by the manufacturing method of the incombustible decorative board of the following (1) term-(5) term, and the incombustible decorative plate of the (6) term-(7) term.
(1) Between two or more layers of the core material layer sheet material (a) having a glass fiber nonwoven fabric as a core material and the core material layer sheet material (a), a thermosetting resin is applied to the glass fiber woven fabric. A non-combustible decorative board in which the laminate material (b) including the reinforcing layer is inserted, and the decorative layer sheet material (c) is laminated and integrated on the surface of the laminate, The core material layer sheet material (a) is a non-combustible decorative board in which a non-combustible layer made of a flame-retardant metal hydroxide is formed on the surface of a glass fiber nonwoven fabric.
(2) The nonflammable decorative board according to item (1), wherein the core material layer sheet material (a) is a nonflammable layer coated with a flame retardant hydroxide aqueous solution containing a flocculant. .
(3) The sheet material (a) for the core material layer has a thermosetting resin layer on the back surface on which the non-combustible layer of the glass fiber nonwoven fabric is formed, as described in item (1) or item (2). Incombustible decorative board.
(4) The core material layer sheet positioned outside the reinforcing layer sheet material (b) in the laminate in which the reinforcing layer sheet material (b) is inserted between the core material layer sheet materials (a). The nonflammable decorative board according to any one of (1) to (3), wherein the material (a) is a plurality of layers.
(5) The decorative layer sheet material (c) is 0.5 mm or less in thickness, and the amount of organic matter is 360 g / m ² or less, described in any one of items (1) to (4) Incombustible decorative board.
(6) Between two or more layers of the core material layer sheet material (a) having a glass fiber nonwoven fabric as a core material and the core material layer sheet material (a), a thermosetting resin is applied to the glass fiber woven fabric. A method for producing a non-combustible decorative board in which a laminate material including a reinforcing layer sheet material (b) is inserted and a decorative layer sheet material (c) is laminated and integrated on the surface of the laminate. The core material layer sheet material (a) is a non-combustible layer made of a flame-retardant hydroxide metal oxide, which is applied to a glass fiber nonwoven fabric using a non-flammable metal hydroxide aqueous solution containing a flocculant. A process for producing a non-combustible decorative board, comprising the step of forming
(7) The nonflammable metal hydroxide aqueous solution contains 80 to 65 mass% of flame retardant metal hydroxide with respect to 100 mass% of the total amount of water and flame retardant metal hydroxide (6). The manufacturing method of the nonflammable decorative board as described in an item.

The non-combustible decorative board according to the present invention has a small amount of warpage such as dimensional change, warpage, deformation, etc., and a calorific value and a smoke generation amount during combustion are suppressed to a small amount, and shape destruction after combustion is small, and shape destruction after combustion. There is almost no, and it conforms to the “non-combustible material” referred to in Article 2-9 of the Building Standard Law.
Further, since the decorative layer can be made of the same decorative layer sheet material as that of the conventional decorative plate, it can be freely selected from abundant color patterns and used as various non-combustible materials.

It is a schematic diagram for demonstrating the structure of the nonflammable decorative board obtained by this invention.

  In the present invention, the glass fiber woven fabric is thermosetting between two or more layers of the core material layer sheet material (a) having a glass fiber nonwoven fabric as a core material and the core material layer sheet material (a). A non-combustible decorative board in which a laminate material (b) containing a resin and a decorative layer sheet material (c) is laminated and integrated on the surface of the laminate. The core material layer sheet material (a) is a non-combustible decorative board, wherein a non-combustible layer made of a flame retardant metal hydroxide is formed on a glass fiber nonwoven fabric, and the core material layer By making it possible to form an incombustible layer made of a flame retardant metal hydroxide that is an inorganic substance as a flame retardant without using a large amount of organic substances such as phenolic resins as in the prior art, the sheet material for Get a non-combustible decorative board that conforms to “non-combustible material” and has low warpage One in which it is bet.

An example of the structure of the incombustible decorative board of the present invention will be described with reference to FIG.
The nonflammable decorative board of the present invention has a surface or surface of an outer layer of a laminate 4 in which a plurality of the core material sheet materials (a) 3 are stacked and the reinforcing layer sheet material (b) 2 is inserted therebetween. It has a structure in which the decorative layer sheet material (c) 5 is laminated on the back surface. FIG. 1 shows an example of a structure in which a laminate composed of two core material layer sheet materials and one reinforcing layer sheet material and two decorative layer sheet materials are laminated. The invention is not limited to this structure.

  The glass fiber nonwoven fabric used for the core layer sheet material (a) of the present invention is a nonwoven fabric composed of general glass fibers used for decorative panels, and is coated with a flame retardant metal hydroxide aqueous solution containing a flocculant. In addition, it is preferable that the non-combustible layer can be formed by impregnating the nonwoven fabric with at least a flame retardant hydroxide.

The basis weight of the glass fiber nonwoven fabric is preferably 30 to 150 g / m ² . The basis weight can be used even outside the above range, but if it is less than 30 g / m ² , there is a risk of insufficient strength in the core layer sheet material, in which case the aqueous solution is applied onto the glass fiber nonwoven fabric. There are cases where difficulties arise in handling during processing or when forming a decorative board. In this case, a plurality of core material layer sheet materials may be stacked. On the other hand, when the basis weight exceeds 150 g / m ² , there is a possibility that the adhesion between the layers may be insufficient when the decorative board is formed.

  The flame retardant metal hydroxide aqueous solution containing a flocculant used in the present invention is obtained by adding a flocculant to an aqueous solution of a flame retardant metal hydroxide. By using this aqueous solution, an incombustible layer made of a flame retardant metal hydroxide can be formed on the glass fiber nonwoven fabric. As long as the object and effect of the present invention are not impaired, a part thereof may be replaced with other additives, resins, and inorganic fillers, and this case is also included in the present invention.

  Examples of the flame retardant metal hydroxide include metal hydroxides such as aluminum hydroxide and magnesium hydroxide, which are generally used as a flame retardant. These flame retardant metal hydroxides preferably have an average particle size of 1 to 100 μm from the viewpoint of improving flame retardancy. Alternatively, the conventional ones having a large particle size and those having a small particle size may be mixed and used for closest packing.

  The flocculant can agglomerate the flame retardant metal hydroxide, and when the flame retardant metal hydroxide aqueous solution is applied to the glass fiber nonwoven fabric to form the incombustible layer, the coating work is easy. It can be. As such a flocculant, those generally used as water purification agents such as water and sewage, human waste treatment, and factory waste water can be used. For example, polymer flocculants (polyacrylamide (nonionic polymer flocculants)) , Polyacrylic acid, acrylamide / acrylic acid copolymer, acrylamide / sodium acrylate copolymer (anionic polymer flocculant), polyacrylamide polymer flocculant, dimethylaminoethyl acrylate polymer flocculant, acrylamide Copolymer of dimethylaminoethyl acrylate methyl chloride quaternary salt (cationic polymer flocculant)), iron flocculant (polyferric sulfate), sulfuric acid band (aluminum sulfate), PAC (polyaluminum chloride), etc. Can be mentioned. Further, the flocculant functions as a binder for the flame retardant metal hydroxides or the glass fiber nonwoven fabric of the flame retardant metal hydroxide, and includes the flame retardant metal hydroxide containing the same. In an aqueous solution of matter, it is preferable that the viscosity of the aqueous solution can be increased and the coating operation can be further improved, thereby eliminating the need to use a thermosetting resin as in the prior art. Among the flocculants, polymer flocculants and the like are preferable. The type of the polymer flocculant is not particularly limited, but anionic ones are preferable. In addition, the flocculant used by this invention can also be used individually by 1 type, However, You may use it in combination of 2 or more type.

  In the flame retardant metal hydroxide aqueous solution containing the flocculant, the flame retardant metal hydroxide aqueous solution is particularly flame retardant with respect to the total amount of water and the flame retardant metal hydroxide being 100% by mass. It is preferable to make the metal hydroxide 65% by mass or more, and this makes it easy to construct the Article 2 of the Building Standards Act, although it depends on the thickness of the surface decorative sheet and the amount of organic matter in the incombustible decorative board of the present invention. It can be adapted to the “non-combustible material” referred to in No. 9. Furthermore, it is preferable that content of a flame-retardant metal hydroxide shall be 80-65 mass%. The flame retardant metal hydroxide can be used outside the above range, but when the temperature falls below the lower limit, the coated incombustible layer flows during the heat and pressure molding in the production of the incombustible decorative board of the present invention. The resulting decorative layer on the surface of the decorative board may become “cut”. If the upper limit is exceeded, the flocculant cannot fully function as a binder, making it difficult to handle the sheet material for the core material layer, and the interlaminar adhesive strength is poor in the molded decorative board. There is also a risk of becoming sufficient.

  The proportion of the flocculant may be used in the flame retardant metal hydroxide aqueous solution within a range in which the function as the flocculant is expressed. It is preferable to add in the ratio of 1 mass% or more and 10 mass% or less, and it is more preferable that it is 5 mass% or less. The flocculant can be used outside the above range, but if the amount falls below the lower limit, the aggregation effect of the flame retardant hydroxide may be reduced, and if the amount exceeds the upper limit, the flocculant color is in the incombustible layer. There is a risk of sticking.

  The core material layer sheet material (a) used in the present invention forms the incombustible layer by applying the flame retardant metal hydroxide aqueous solution to one surface of the glass fiber nonwoven fabric by a general coating method. Can be obtained. The impregnation ratio of the flame retardant metal hydroxide aqueous solution (however, as a solid content) to the glass fiber nonwoven fabric depends on the basis weight of the glass fiber nonwoven fabric. Preferably, it is about 10 times or more and 60 times or less. The impregnation rate can be used outside the above range, but if the impregnation rate is below the lower limit, the adjustment of the thickness of the decorative board and the surface finish may be affected, or the flame resistance may be reduced. If the upper limit is exceeded, the interlayer adhesion strength may be reduced.

The core material layer sheet material (a) is a surface on which a noncombustible layer is formed in the core material layer sheet material in which a noncombustible layer is formed on one surface of a glass fiber nonwoven fabric in order to improve adhesion between layers. It is preferable to apply a thermosetting resin (varnish) to the surface on the back side. The thermosetting resin used for the core layer sheet material (a) is not particularly limited as long as it is a thermosetting resin such as a melamine resin or a phenol resin, but is preferably a melamine resin or a phenol resin. A melamine resin excellent in flame resistance is preferable in conformity with “non-combustible material”.
As the melamine resin, those having a molar ratio of formaldehyde to melamine (hereinafter simply referred to as a molar ratio) of 1.0 to 4.0 are used, but the melamine resin is not limited to this range. From the viewpoint of properties and the like, a range of 1.0 to 2.0 is preferable, and an acidic curing agent generally used can be appropriately blended in the melamine resin varnish.

Next, the reinforcing layer sheet material which is one of the features of the present invention will be described.
The sheet material for reinforcing layer (b) containing the thermosetting resin in the glass fiber woven fabric used in the present invention can be obtained by impregnating the glass fiber woven fabric with the thermosetting resin.

  The glass fiber woven fabric used for the sheet material for reinforcing layer (b) of the present invention is a woven fabric composed of general glass fibers used for a decorative board, similarly to the glass fiber nonwoven fabric used for the sheet material for core layer (a). It is preferably a cloth that can be applied with a thermosetting resin.

The basis weight of the glass fiber woven fabric is preferably a 10 to 300 g / ^{m 2,} more and more preferably 20 to 250 g / ^{m 2.} Basis weight can be used outside the above range, but if it is less than the above lower limit value, a combustion test for obtaining “non-combustible material” certification as referred to in Article 2, Item 9 of the Building Standards Law There is a risk that after the decorative plate is burned, a hole will be opened after the decorative plate is burned, and it will no longer conform to the “non-combustible material”. If the above upper limit is exceeded, there is no problem in performance, but the cost increases.

  The thermosetting resin used for the reinforcing layer sheet material (b) is not particularly limited as long as it is a general thermosetting resin used for a decorative board such as a melamine resin or a phenol resin. Therefore, a melamine resin having excellent flame resistance is preferable. The thermosetting resin used for the reinforcing layer sheet material (b) may be the same as the thermosetting resin used for the core material layer sheet material (a).

  As for the ratio of the thermosetting resin to the glass fiber woven fabric, if this ratio is large, the adhesion to the sheet material for the core material layer will be good, but the flame resistance will decrease, and conversely if it is small, the flame resistance will be reduced. Although it is good, adhesiveness with the sheet material for core material layers is lowered, and the reinforcing effect may be reduced. Therefore, in order to obtain a reliable reinforcing effect and good flame resistance, the impregnation ratio of the thermosetting resin is usually about 20 to 150% by mass with respect to the glass fiber woven fabric, preferably 25 to 25%. 100% by mass. By inserting the reinforcing layer sheet material (b) between two or more core layer layer sheet materials (a) to obtain a decorative plate, there is little dimensional change, warping, deformation, etc., and the shape after combustion Good retention and great non-flammability improvement effect.

In the present invention, the decorative layer sheet material (c) to be overlaid on the surface of the core material layer sheet material (a) is usually a fiber sheet base material for a decorative layer impregnated with a thermosetting resin. More specifically, the sheet or paper of the fiber sheet base material for the decorative layer is composed of melamine resin alone or melamine resin 60 to 95% by mass, aluminum hydroxide or magnesium hydroxide or silica 40 to 5% by mass. An impregnated sheet or paper impregnated with the blend can be used. Moreover, as a basic weight of the sheet material for decorative layers, the thing of 40-150 g / m < ² > is preferable.
As the cosmetic fiber sheet substrate, a substrate such as pulp, linter, synthetic fiber, or glass fiber is used, and a pigment such as titanium oxide can be contained as necessary.
The impregnation rate of the melamine resin or the compound is usually 80 to 300% by mass with respect to the sheet or paper. As the melamine resin, those added with 0.1 to 20% by mass of a normal modifier (for example, glycols) can be used, and an acidic curing agent can be appropriately blended.

  The incombustible decorative board of the present invention forms, for example, a laminate in which a plurality of the core material layer sheet materials (a) are stacked and the reinforcing layer sheet material (b) is inserted therebetween. In the laminate, by using at least one sheet material for reinforcing layer (b), a sufficient effect as a reinforcing layer can be obtained. For example, two sheets of core material layer sheet material (a) can be obtained. A plurality of sheets, such as laminating the reinforcing layer sheet material (b), or laminating one reinforcing layer sheet material (b) on the central layer of the four core layer sheet materials (a). The sheet material for the core layer (a) can be obtained by laminating the sheet material for the reinforcing layer (b), and the number of each can be determined as appropriate. Next, the decorative layer sheet material (c) is superimposed on the front surface or the front and back surfaces of the outer layer of the laminate, and can be obtained by heating and pressing. At the time of molding, a mirror finished plate, an embossed plate, an embossed film, or the like is overlaid on the surface of the decorative layer sheet material (c), so that it can be finished on a surface such as a mirror finished or embossed finish.

In the non-combustible decorative board of the present invention, the decorative layer sheet material (c) is laminated and integrated on the surface of the core material layer sheet material (a) as a decorative layer. In addition, it is preferable to use the decorative layer sheet material (c) also on the back surface side.
Both of these decorative layer sheet materials (c) preferably have a thickness of 0.5 mm or less and the amount of organic matter is 360 g / m ² or less, but pass the test of the “non-combustible material”. This is not limited as long as it does not cause warping.

Moreover, as a structure of the nonflammable decorative board of this invention, it is the same as that of the fiber sheet base material for cosmetic layers of 10-50 g / m < ² > of basic weight on the surface of the impregnation sheet | seat or impregnated paper in the said decorative layer sheet material (c). The melamine resin alone or an overlay-impregnated paper impregnated with a composition comprising 60 to 95% by mass of melamine resin, 40 to 5% by mass of aluminum hydroxide, magnesium hydroxide or silica can be combined with the sheet or paper.

The impregnation rate of the melamine resin or blend of the overlay impregnated paper is usually preferably 80 to 300% by mass with respect to the sheet or paper. Moreover, the method which combined the said overlay impregnation paper with the surface (back surface side of a noncombustible decorative board) of the fiber sheet base material for makeup layers which does not impregnate resin may be sufficient.
Moreover, about the glass fiber nonwoven fabric of the above-mentioned sheet | seat material for core material layers (a), you may laminate | stack the above-mentioned overlay impregnation paper instead of applying a melamine resin to the back surface of the coating surface of a compound.

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. Here, “%”, “part”, and “fold” are all “mass%”, “part by mass”, and “times mass”.

Example 1
A glass fiber nonwoven fabric (basis weight: 75 g / m ² , specific gravity: 0.23 g / cm ³ , organic binder content 11% by mass) is prepared, and aluminum hydroxide (average particle diameter 60 μm) 80 is provided on one surface of the nonwoven fabric. A composition consisting of 1 part of water, 20 parts of water and 1 part of an acrylamide / sodium acrylate copolymer (polymer flocculant manufactured by Daimei Chemical Industry Co., Ltd.) was applied, and a melamine resin (molar ratio 1.5 , Resin solid content 50 mass%) was applied to obtain a core material layer sheet material having an impregnation rate of 20 mass times. Next, a glass woven fabric (basis weight 210 g / m ² , organic binder content 0.08% by mass) is prepared, and the melamine resin is applied to the woven fabric, and the impregnation rate is 80% by mass. Sheet material was obtained.
Next, one sheet of the reinforcing layer sheet material obtained above was inserted into the central layer of the four core material layer sheet materials obtained above to produce a laminate.
Next, the decorative base paper for decorative board (titanium oxide-containing pulp) having a basis weight of 80 g / m ² was impregnated with the above melamine resin, and two sheets of decorative layer sheet materials having an impregnation rate of 100% by mass were produced. These sheet materials for decorative layers had a thickness of 0.1 mm and an organic substance amount of 130 g / m ² . These decorative layer sheet materials are layered one by one on the front and back of the laminate outer layer (core material layer sheet material) obtained above, and heated and pressurized at 140 ° C. and 80 kg / cm ² for 20 minutes. Molding was performed to obtain a decorative board having a thickness of 3.0 mm.

Example 2
From one side of the same glass fiber nonwoven fabric used in Example 1, 65 parts of aluminum hydroxide (average particle size 60 μm), 35 parts of water and 1 part of the same polymer flocculant used in Example 1 Then, a melamine resin (molar ratio 1.5, resin solid content 50% by weight) was applied to the back surface to obtain a core material layer sheet material having an impregnation rate of 20 mass times. Next, a reinforcing layer sheet material was obtained in the same manner as in Example 1. Next, one sheet of the reinforcing layer sheet material obtained above was inserted between the four sheet materials of the core material layer obtained above to produce a laminate. Next, two sheets of decorative layer sheet materials were produced in the same manner as in Example 1. These decorative layer sheet materials are laminated one by one on the front and back of the laminate outer layer (core material layer sheet material) obtained above, and heated and pressed under conditions of 140 ° C. and 80 kg / cm ² for 20 minutes. Thus, a decorative board having a thickness of 3.0 mm was obtained.

Example 3
From one side of the same glass fiber nonwoven fabric used in Example 1, 70 parts of aluminum hydroxide (average particle diameter 60 μm), 30 parts of water, and 1 part of the same polymer flocculant used in Example 1 Then, a melamine resin (molar ratio 1.5, resin solid content 50% by weight) was applied to the back surface to obtain a core material layer sheet material having an impregnation rate of 20 mass times. Next, a reinforcing layer sheet material was obtained in the same manner as in Example 1. Next, one sheet of the reinforcing layer sheet material obtained above was inserted between the two sheet materials for the core material layer obtained above to produce a laminate. Next, two sheets of decorative layer sheet materials were produced in the same manner as in Example 1. These decorative layer sheet materials are laminated one by one on the front and back of the laminate outer layer (core material layer sheet material) obtained above, and heated and pressed under conditions of 140 ° C. and 80 kg / cm ² for 20 minutes. Thus, a decorative board having a thickness of 1.9 mm was obtained.

Example 4
From one side of the same glass fiber nonwoven fabric used in Example 1, 70 parts of aluminum hydroxide (average particle diameter 60 μm), 30 parts of water, and 1 part of the same polymer flocculant used in Example 1 Then, a melamine resin (molar ratio 1.5, resin solid content 50% by weight) was applied to the back surface to obtain a core material layer sheet material having an impregnation rate of 20 mass times. Next, a reinforcing layer sheet material was obtained in the same manner as in Example 1. Next, one sheet of reinforcing layer sheet material obtained above was inserted between the three sheet materials of core material layer obtained above, and a laminate was produced. Next, two sheets of decorative layer sheet materials were produced in the same manner as in Example 1. These decorative layer sheet materials are laminated one by one on the front and back of the laminate outer layer (core material layer sheet material) obtained above, and heated and pressed under conditions of 140 ° C. and 80 kg / cm ² for 20 minutes. Thus, a decorative board having a thickness of 2.5 mm was obtained.

Comparative Example 1
On one side of the same glass fiber nonwoven fabric used in Example 1, 80 parts of aluminum hydroxide (average particle diameter 60 μm) and 20 parts of a resol type phenolic resin (molar ratio 1.3, resin solid content 50% by mass) And a mixture of 15 parts of water and alcohol, and a resol-type phenolic resin (molar ratio 1.3, resin solid content 50% by mass) on the back side, and a core material with an impregnation rate of 20 mass times A layer sheet material was obtained. Next, a reinforcing layer sheet material was obtained in the same manner as in Example 1. Next, one sheet of the reinforcing layer sheet material obtained above was inserted between the four sheet materials of the core material layer obtained above to produce a laminate. Next, two sheets of decorative layer sheet materials were produced in the same manner as in Example 1. These decorative layer sheet materials are laminated one by one on the front and back of the laminate outer layer (core material layer sheet material) obtained above, and heated and pressed under conditions of 140 ° C. and 80 kg / cm ² for 20 minutes. Thus, a decorative board having a thickness of 3.0 mm was obtained.

The characteristics of the decorative boards obtained in the above Examples and Comparative Examples were evaluated, and the results are shown in Table 1.
(Test method)
1. Non-flammability test Japan Building General Test Site standard “Fireproof and fireproof performance test and evaluation method” 4.10 Nonflammability test and evaluation method, (2) ii) 4.10.2 Exothermic test and evaluation method and 4.10.3 Gas Hazardous testing and evaluation methods were used. The above items of the business standard "Fireproof and Fireproof Performance Test / Evaluation Business Method" describe performance evaluation methods related to certification based on the provisions of Article 2, Item 9 (non-combustible materials) of the Building Standards Act.
2. Interlaminar strength Based on JAS (special plywood) plane tensile test.
3. The amount of warpage Each 30 × 30 cm size decorative plate was placed in a dryer at 70 ° C. for 60 minutes, then placed on a horizontal table, the distance between the center of each of the four sides and the table was measured, and the maximum value was recorded.
4). Appearance The front and back of the decorative plate were visually observed to check for the presence of “cut” in the decorative layer.

  As is clear from this result, the decorative board obtained in the example was not warped and conformed to the “non-combustible material” referred to in Article 2, Item 9 of the Building Standard Law. On the other hand, the decorative board obtained in Comparative Example 1 was suitable for “non-combustible material”, but the amount of warpage was large.

  The decorative board according to the present invention conforms to the “non-combustible material” referred to in Article 2, Item 9 of the Building Standard Law. Further, the amount of warpage is small as compared with the conventional noncombustible decorative board. Furthermore, since the decorative layer can be made of the same decorative layer sheet material as the conventional decorative plate, it can be freely selected from abundant color patterns. It can be used for various applications such as receiving walls and kitchen panel materials.

DESCRIPTION OF SYMBOLS 1 Decorative board 2 Sheet material for reinforcing layer 3 Sheet material for core material layer 4 Laminate 5 Sheet material for decorative layer

Claims (7)

  Reinforcing the glass fiber woven fabric with a thermosetting resin between two or more layers of the core material layer sheet material (a) having a glass fiber nonwoven fabric as a core material and the core material layer sheet material (a) A non-combustible decorative board in which a laminate in which a layer sheet material (b) is inserted and a decorative layer sheet material (c) are laminated and integrated on the surface of the laminate, the core material The layer sheet material (a) is a non-combustible decorative board in which a non-combustible layer made of a flame-retardant metal hydroxide is formed on the surface of a glass fiber nonwoven fabric.   The nonflammable decorative board according to claim 1, wherein the core material layer sheet material (a) is a nonflammable layer coated with a flame retardant hydroxide aqueous solution containing a flocculant.   The nonflammable decorative board according to claim 1 or 2, wherein the sheet material (a) for the core layer has a thermosetting resin layer on the back surface on which the nonflammable layer of the glass fiber nonwoven fabric is formed.   In the laminate in which the reinforcing layer sheet material (b) is inserted between the core material layer sheet materials (a), the core material layer sheet material (a ) Is a plurality of layers. The nonflammable decorative board according to any one of claims 1 to 3. Decorative layer sheet material (c) is less than a thickness of 0.5 mm, non-combustible decorative board according to claim 1 the amount of organic matter is 360 g / ^{m 2} or less.   Reinforcing the glass fiber woven fabric with a thermosetting resin between two or more layers of the core material layer sheet material (a) having a glass fiber nonwoven fabric as a core material and the core material layer sheet material (a) It is a method for producing a non-combustible decorative board in which a laminate in which a layer sheet material (b) is inserted, and a decorative layer sheet material (c) is laminated and integrated on the surface of the laminate. The sheet material for core layer (a) is applied to a glass fiber nonwoven fabric using an incombustible metal hydroxide aqueous solution containing a flocculant to form an incombustible layer made of a flame retardant hydroxide metal oxide. A method for producing a nonflammable decorative board, comprising a step.   The incombustible metal hydroxide aqueous solution contains 80 to 65 mass% of flame retardant metal hydroxide with respect to 100 mass% of the total amount of water and the flame retardant metal hydroxide. For producing a decorative decorative board.

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