JP4121473B2 - Laminated flame retardant composition, laminated flame retardant sheet, and flame retardant decorative board - Google Patents

Description

The present invention relates to a laminate flame-retardant composition, a laminate flame-retardant sheet, and a flame-retardant decorative board.

   Conventionally, as a method for making a synthetic resin flame retardant, a technique of blending a phosphoric flame retardant, particularly an ammonium polyphosphate which is particularly inexpensive and has high flame retardancy is widely known. The flame-retardant mechanism of phosphorus-based flame retardants is that a flame-retardant and heat-insulating carbonized layer is formed by the flame retardant, which suppresses the transfer of heat from the flame to the substance, pyrolysis of the substance, It depends on the occurrence being suppressed.

Conventionally, a decorative board provided with functions such as fire prevention and nonflammability is known, and a resin-impregnated decorative paper impregnated with a resin liquid mainly composed of a thermosetting resin on a decorative paper for a decorative board; A prepreg impregnated with an inorganic fiber nonwoven fabric containing phenol resin or melamine resin as a binder component and impregnated with a slurry containing an inorganic filler was used as a core layer, and both were laminated and hot-press molded.
JP 2003-238902 A JP-A-5-86310 Japanese Patent Laid-Open No. 10-7947 JP 2001-323216 A JP 2000-94561 A JP 9-49199 A JP 2000-73065 A Japanese Unexamined Patent Publication No. 7-300588

  By the way, when the conventional phosphorus flame retardant is applied to the surface of the fiber sheet, many of the active ingredients penetrate into the fiber sheet. Therefore, compared to what remains as a coating film on the surface, many of the active ingredients, for example, expansion of the fiber sheet is suppressed by the fiber, the carbonization degree of the carbonized layer is reduced, for example, the carbonized layer formation ability is suppressed There was a problem of being.

  In addition, when laminating the decorative material of the decorative board and hot pressing, the active ingredient of the flame retardant may permeate and diffuse into the adjacent layer with heating and pressurization, It was the cause that the formation ability of the carbonized layer was suppressed.

The present invention has been made in order to solve the above problems, and the purpose thereof is to apply the active ingredient in the vicinity of the surface even when the laminate flame retardant composition is applied to the surface of the base material that easily penetrates into the inside. In addition, a laminated sheet flame-retardant composition capable of forming a sufficient carbonized layer that is not easily transferred to an adjacent layer even when laminated and heated / pressurized, and its lamination It is providing the laminated sheet flame-retardant sheet | seat comprised using the board flame-retardant composition, and a flame-retardant decorative board.

The characteristic configuration employed in the present invention will be described below.
The composition for flame retarding of a laminated board of the present invention is a water-soluble organic substance 5 that is subjected to dehydration by phosphorus and becomes a carbonized layer when receiving heat accompanying combustion with respect to 100 parts by weight of surface-coated ammonium polyphosphate. ~ 60 parts by weight and scaly mica 15 ~ 50 parts by weight are blended .

Such laminates flame retardant composition, penetration tends base liquid component therein (e.g., the fibrous base material) is applied to the surface of the flow components of the laminate flame retardant composition is When penetrating into a fine gap, a scaly inorganic substance is caught in the vicinity of the entrance of the gap and functions as an obstacle that prevents the penetration of the fluid component. Therefore, the active ingredient of the laminate flame retardant composition is less likely to penetrate into the inside of the base material, and the active ingredient can be sufficiently present in the vicinity of the surface of the base material.

In addition, even when another layer is laminated on the layer where the laminated sheet flame retardant composition is present and heated and pressurized, the scaly inorganic substance is effective for the laminated flame retardant composition. Prevent components from migrating to adjacent layers.
Therefore, according to the composition for flame retarding a laminated board , even if there is a layer in which a liquid component easily permeates or a layer adjacent during heating / pressurizing, the laminated board is difficult to enter into such a layer. not retarded composition for migration, the existence ratio of the laminate flame retardant composition can form a very high area, it is possible to form a sufficient foamed char layer in an environment undergoing high heat, The flame retardancy of the object to be applied can be improved. In addition, since the scaly inorganic substance itself is nonflammable, flame resistance is also improved.

  As the foamed carbonized component, various combinations of various substances can be considered as long as a foamed carbonized layer can be formed. Basically, (A) a substance that serves as a gas supply source during foaming, (B It is a component that combines a substance serving as a carbon source for forming a carbonized layer and (C) a phosphorus compound that promotes carbonization by a dehydration reaction. Each of these components (A) to (C) may be different materials, or one material functions as two or more components (for example, a gas supply source at the time of foaming and a carbonized layer) It may also be a carbon source for forming.

  To give a more specific example, for example, when the foamed carbonized component is subjected to dehydration action by phosphorus when receiving an ammonium salt of inorganic phosphoric acid or a metal salt of inorganic phosphoric acid and heat accompanying combustion, the carbonized layer What mix | blends with the organic substance used as can be used.

Examples of the ammonium salt of inorganic phosphoric acid include monoammonium phosphate, diammonium phosphate, triammonium phosphate, ammonium phosphite, ammonium hypophosphite, and ammonium polyphosphate. These inorganic ammonium phosphates produce condensed phosphoric acid by deammonification when the decomposition temperature is reached by heating. This condensed phosphoric acid acts as a dehydration catalyst for organic matter and carbonizes the organic matter, thereby promoting the formation of a carbonized layer. In addition, the ammonia gas generated at this time acts as a foaming agent, and has a function of expanding the laminated flame retardant composition.

  In addition, since ammonium polyphosphate has a relatively high water solubility, it is preferable to use surface-coated ammonium polyphosphate having a surface coated with a water-resistant resin. Examples of surface-coated ammonium polyphosphate include, for example, thermosetting resins and thermoplastic resins, specifically, melamine resins, urea resins, alkyd resins, urethane resins, phenol resins, epoxy resins, unsaturated polyester resins, silicones. Resin, thinly coated with an acrylic resin, etc., microencapsulated, or melamine monomer or other nitrogen organic compound coated on the surface of ammonium polyphosphate is preferable because it prevents elution. , CHISSO Co., Ltd. Terrage (registered trademark) C-60, C-70, C-80, Phosphor Chemical Co., Ltd. Nova Excel, Sumitomo Chemical Co., Ltd. SUMI SAFE-PM, etc. are mentioned.

  The ammonium polyphosphate is, for example, an ammonium salt of polyphosphoric acid such as pyrophosphoric acid, triphosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid, which is a condensate of orthophosphoric acid, and is a particulate substance represented by the following chemical formula 1. .

このポリリン酸アンモニウムは、３００℃程度以上の高温では水が脱離して、火災の消火効果を発揮すると共に、含窒素系発泡剤と同様に、熱分解して不燃性のアンモニアガスを発生させる働きも有するリン酸系発泡型難燃剤である。

This ammonium polyphosphate exhibits water extinction at a high temperature of about 300 ° C. or more and exhibits a fire-extinguishing effect, and, like a nitrogen-containing foaming agent, thermally decomposes to generate nonflammable ammonia gas. It is also a phosphoric acid-based foamed flame retardant.

  In the present invention, among these inorganic phosphoric acid ammonium salts, ammonium polyphosphate and surface-coated ammonium polyphosphate are particularly preferably used. Examples of the metal salt of inorganic phosphoric acid include sodium salts such as monosodium phosphate, disodium phosphate, trisodium phosphate, monosodium phosphite, disodium phosphite, and sodium hypophosphite, Potassium salts such as monopotassium phosphate, dipotassium phosphate, tripotassium phosphate, monopotassium phosphite, dipotassium phosphite, potassium hypophosphite, monolithium phosphate, dilithium phosphate, triphosphate Lithium salts such as lithium, monolithium phosphite, dilithium phosphite, lithium hypophosphite, barium salts such as barium dihydrogen phosphate, barium hydrogen phosphate, tribarium phosphate, barium hypophosphite, Magnesium salts such as magnesium monohydrogen phosphate, magnesium hydrogen phosphate, trimagnesium phosphate, magnesium hypophosphite, diphosphate Calcium salts such as calcium calcium, calcium hydrogen phosphate, tricalcium phosphate and calcium hypophosphite, zinc salts such as zinc phosphate, zinc phosphite and zinc hypophosphite, aluminum phosphate, aluminum hypophosphite, etc. The aluminum salt of these can be mentioned. These metal salts of inorganic phosphoric acid act as a dehydration catalyst, and as a result of carbonizing organic matter, promote formation of a carbonized layer.

  Furthermore, the organic substance that becomes a carbonized layer by dehydration by phosphorus when it receives heat from combustion is carbonized in a state of containing gas generated by a substance that functions as a foaming agent in the form of bubbles. As such an organic substance, for example, a polyhydric alcohol, a water-soluble polysaccharide, a phenol resin, expandable graphite, or the like, which is composed only of carbon, oxygen, and hydrogen can be used.

  Examples of the polyhydric alcohol include monopentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, tris (2-hydroxyethyl) isocyanate, triethylene glycol, sorbitol, resorcinol, glycerin, trimethylol methane, trimethylol propane. , Diethylene glycol, propylene glycol, hexamethylene glycol, inositol and the like.

  Water-soluble polysaccharides are those that dissolve at 1% by weight or more at room temperature, act as thickeners, carbonize when exposed to heat, exhibit high gas barrier properties, and flammable gases in the core layer made of prepreg Shut off.

  Specific examples include starch, cellulose, dextrin or derivatives thereof. In particular, cellulose and dextrin are easily modified chemically, and are adjusted to have a hydrophilic structure portion and a hydrophobic structure portion in the molecule. It is easily used and suitable, and can also serve as a binder for coating impregnation.

  Examples of cellulose or a derivative thereof include hydrated cellulose, carboxymethyl cellulose or a sodium derivative thereof, cellulose ester, cellulose ether, and the like, and cellulose ether is particularly preferable.

  In cellulose ether, all or part of the hydrogen atoms of the three hydroxyl groups of monosaccharide units (glucose with β1 → 4 glycosidic bonds) constituting cellulose are substituted with alkyl groups (including substituted alkyl groups). Specifically, methyl cellulose (MC), ethyl cellulose (EC), carboxymethyl cellulose (CMC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), diethylaminoethyl cellulose, 1,3-dihydroxypropyl cellulose Examples of mixed ethers of cellulose that are substituted with two or more alkyl groups include carboxymethyl hydroxyethyl cellulose, hydroxyethyl methyl cellulose (HEMC), hydroxypropyl methyl cell Over scan (HPMC), hydroxybutyl methylcellulose (HBMC), include ethyl hydroxyethyl cellulose (EHEC) and 2-hydroxyethyl-1-hydroxyethyl cellulose.

  These organic substances also serve as a binder component for coating and impregnation, and are preferably blended in an amount of 5 to 60 parts by weight with respect to 100 parts by weight of the inorganic ammonium phosphate or metal salt. If the carbonized layer is not sufficiently formed and the upper limit is exceeded, heat generation tends to occur and nonflammability becomes poor.

  Among these, when the adjacent layer is hydrophobic, the water-soluble organic substance is preferable because penetration and diffusion into the adjacent layer are suppressed. For example, polyvinyl alcohol, polyethylene oxide, pullulan, xanthan gum, methyl cellulose, Hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, cellulose acetate phthalate, gelatin, glue, collagen protein, casein, agar, sodium chondroitin sulfate, sodium alginate, sodium polyacrylate, polyvinylpyrrolidone, polyethyleneimide, gum arabic, acrylic polymerization, etc. Examples include emulsions, suspensions of phenol resins that do not increase the degree of crosslinking, and suspensions of epoxy resins.

  It is important that the inorganic substance has a scaly shape. For example, the particle diameter (D50) corresponding to the 50% of the particle size distribution curve is preferably 10 μm to 50 μm or less, and the weight average aspect ratio (average flake diameter) / Average thickness) may be 10 or more, preferably 20 or more in terms of inhibiting penetration.

Examples of such scale-like inorganic materials, for example, muscovite, phlogopite, synthetic mica, mica and metal oxide-coated mica, talc, kaolin, bentonite, sepiolite, graphite, glass flake, platy oxide Examples of the metal powder include iron pigment and metal powder. Examples of the metal powder include iron oxide and aluminum powder.

The amount of the scaly inorganic substances, ammonium salt or metal salt to 100 parts by weight of inorganic phosphate, and said organic material to 5 to 60 parts by weight, it is desirable to 15 to 50 parts by weight, scale-like inorganic When the ratio of the substance is less than the lower limit, it becomes impossible to sufficiently suppress the flowable component of the laminate flame retardant composition from moving to the inside of the base material or an adjacent layer.
On the contrary, if the upper limit is exceeded, foaming is suppressed, which causes a decrease in adhesion during lamination.

In addition, the composition for flame retarding of the laminate of the present invention includes components other than the main component as long as it is a component that does not hinder the function of the main component as described above or a component that improves the function of the main component. It does not matter.

  For example, a nitrogen-containing foaming agent may be blended in order to promote the formation of the foamed layer. Nitrogen-containing foaming agents generate a large amount of nonflammable gases such as nitrogen and ammonia when heated, and foam the carbonized layer. For example, melamine, butylmelamine, trimethylolmelamine, hexamethylolmelamine, hexamethoxy Nitrogen-containing compounds such as methylmelamine, urea, dicyandiamide, azodicarbonamide, guanidine, guanidine sulfamate, and the like may be mentioned, and two or more kinds may be used in combination. The blending ratio of the nitrogen-containing foaming agent is desirably 50 parts by weight or less with respect to 100 parts by weight of the inorganic phosphoric acid ammonium salt or metal salt. May deteriorate, resulting in poor fire resistance.

The laminated board flame retardant composition as described above is applied to the surface of a fiber sheet, for example, to form a laminated board flame retardant sheet. In this case, examples of the fiber sheet include various inorganic fiber sheets such as non-woven fabric and woven fabric of inorganic fibers such as glass fiber, rock wool, and carbon fiber. The basis weight of the inorganic fiber sheet is 20 to 200 g / m ² . The range is suitable, and in particular, it is preferable to use glass fibers having excellent heat resistance and flame resistance.

Also, when you apply laminate flame retardant composition to the surface of the fiber sheet is coated with a laminate flame retardant composition by a roller or spray onto the surface of the fiber sheet, laminates flame retardant fibrous sheets Performing treatment for adhering the laminate flame retardant composition to the surface of the fiber sheet, such as dipping in the composition, transferring or printing the laminate flame retardant composition to the fiber sheet means. In addition, as long as a sufficient amount of the laminate sheet flame-retardant composition is attached to the surface of the fiber sheet, the laminate sheet flame-retardant composition may penetrate into the fiber sheet. Amount of adhesion for the fibrous sheet is preferably set to 50 to 200 g / m ^2.

Alternatively, the flame retardant composition for laminated board may be applied to the surface of a resin-impregnated paper in which a base paper for decorative board (for example, kraft paper) is impregnated with a resin liquid mainly composed of a thermosetting resin. Thereby, the laminated sheet flame-retardant sheet is configured. In this case, since the penetration of the laminated sheet flame retardant composition into the base paper is suppressed, the coating amount may be smaller than in the case where the fiber sheet is impregnated.

Furthermore, by laminating a laminated sheet flame-retardant sheet as described above, a resin-impregnated decorative paper, and a core layer formed by impregnating and drying a slurry containing a binder component and an inorganic filler in a fiber sheet, You may comprise a flame-retardant decorative board. In this case, at least one of the front and back surfaces of the flame-retardant decorative board has a structure in which the resin-impregnated decorative paper, the laminated sheet flame-retardant sheet, and the core layer are laminated in this order from the outer surface side. It is good to be.

More specifically, the decorative board having the resin-impregnated decorative paper A and the core layer C includes a single-sided decorative board having an A + C laminated structure and a double-sided decorative board having an A + C + A laminated structure. By interposing a laminated sheet flame-retardant sheet B between A and C in the structure, a laminated structure such as A + B + C, A + B + C + B + A can be formed, and both of them are impregnated with the resin from the outer surface side. The decorative paper A, the laminated sheet flame-retardant sheet B, and the core layer C are laminated in this order. In the case of a double-sided decorative board, it is also possible to improve the flame retardancy of only one surface by constituting a laminated structure such as A + B + C + A. The impregnated decorative paper A, the laminated sheet flame-retardant sheet B, and the core layer C are laminated in this order.

  As the fiber sheet used for forming the core layer, an inorganic fiber sheet or an organic fiber sheet can be applied. Examples of organic fibers include polyethylene, polypropylene, vinylon, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyamide, polyester, polyurethane, etc., modified products thereof, and various copolymers typified by ethylene-vinyl acetate copolymers. Examples thereof include fibers made of polymers and mixtures thereof, and composite fibers made of these polymers.

  Specific examples of the organic resin component as the binder component include flame retardant resins such as amino-formaldehyde resins, phenol resins, urethane resins, and epoxy resins, and two or more types may be used in combination.

  Amino-formaldehyde resin is an initial condensate obtained by reacting amino compounds such as melamine, urea, benzoguanamine and acetoguanamine with formaldehyde, etherification with lower alcohols such as methyl alcohol and butyl alcohol, and paratoluene. Those modified with a reactive modifier that promotes plasticization such as sulfonamide can be applied, and melamine-formaldehyde resin excellent in durability is particularly preferable.

  Phenol resins are obtained by reacting phenols and aldehydes in a ratio of 1 to 3 moles of aldehydes with 1 mole of phenolic hydroxyl group under a basic catalyst or an acidic catalyst. Phenol, cresol, xylenol, octylphenol, phenylphenol, bisphenol A, bisphenol S, bisphenol F and the like. Examples of aldehydes include formaldehyde, paraformaldehyde, glyoxal, trioxal and the like.

  In addition, those modified with a modifying agent that promotes plasticization such as paratoluene sulfonamide, tung oil, phosphoric esters, glycols, etc. can be applied as necessary, and basic catalysts include alkali metals such as sodium and potassium, And oxides and hydroxides of alkaline earth metals such as magnesium and calcium, amines such as triethylamine and triethanolamine, and ammonia. Examples of acidic catalysts include paratoluenesulfonic acid and hydrochloric acid.

  Examples of the urethane resin include prepolymers, adducts, block isocyanates, and the like made from compounds having an isocyanate group such as tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

  Epoxy resins include bisphenol A type epoxy resins having at least two epoxy groups in one molecule, phenol novolac type epoxy resins having two or more epoxy groups in one molecule, orthocresol novolac type epoxy resins, bisphenols. Examples thereof include F-type epoxy resins, alicyclic epoxy resins, trifunctional or higher polyfunctional epoxy resins and brominated products thereof, and mixtures thereof, and ordinary epoxy resins used for laminates can be used.

  Examples of the inorganic filler include aluminum hydroxide, magnesium hydroxide, calcium carbonate, silica and the like. Among inorganic fillers, those with an average particle size in the range of 0.5 to 200 μm can be impregnated into inorganic fiber nonwoven fabrics, and those containing crystal water such as aluminum hydroxide and magnesium hydroxide decompose at high temperatures. It is optimal in terms of nonflammability because it absorbs heat and binds water.

  When impregnating the slurry into a fiber sheet such as an inorganic fiber sheet or an organic fiber sheet, it is desirable that the content of the organic resin component in the prepreg is 3 to 50% by the calculation method represented by the following formula 1. If the lower limit is not reached, the nonflammability deteriorates. If the upper limit is exceeded, the strength and adhesion tend to be poor, and the nonflammability also decreases.

  In addition, the slurry content (%) in the prepreg is preferably in the range of 500 to 3000% by the calculation method represented by the following formula 2. If the upper limit is exceeded, the solid content will drop off and it will be difficult to handle, and the lower limit is not reached And easy delamination.

A decorative layer is formed on the laminated sheet flame-retardant sheet. As a method for forming the decorative layer, a method of applying a coating, and a method using a resin-impregnated decorative paper, the productivity to use a resin impregnated decorative paper and a method of transferring a decorative layer using a transfer foil, laminate It is particularly preferable in terms of adhesion to the flame retardant sheet side and wear resistance.

  As a means for painting, a resin liquid containing, for example, methyl ethyl ketone peroxide as a curing agent and, for example, cobalt naphthenate as a curing accelerator, is applied to an unsaturated polyester resin colored with a pigment on the core layer. Then, the coated surface is covered with a vinylon film, spread with a roller, and after the resin is cured, the vinylon film may be peeled off.

  The unsaturated polyester resin contains an acid component containing an unsaturated dibasic acid and / or an acid anhydride thereof and other saturated acid and / or acid anhydride used as necessary, and a polyhydric alcohol. A dehydration-condensation reaction is carried out according to a conventional method at about 160 to 230 ° C., preferably 210 to 230 ° C. in an inert gas atmosphere such as argon, and a polymerizable monomer such as a styrene monomer is added.

The method using a resin-impregnated decorative paper is a method in which a base resin for decorative board is impregnated with a resin liquid containing a thermosetting resin as a main component, and the dried resin-impregnated decorative paper is laminated and hot-pressed. The resin-impregnated decorative paper is obtained by impregnating a decorative liquid for decorative board of 80 to 140 g / m ² with a resin liquid containing a thermosetting resin as a main component. As the thermosetting resin, the amino-formaldehyde described above is used. In addition to the resin, diallyl phthalate resin, unsaturated polyester resin, or a mixture thereof can be used. Among these, amino-formaldehyde resins that are excellent in various physical properties such as wear resistance, water resistance, and heat resistance are preferable.

As described above, according to the present invention, even when the liquid component is applied to the surface of the base material that easily penetrates into the inside, the active component can be sufficiently present in the vicinity of the surface. Even if it applies, the composition for flame-retardation of a laminated board which cannot be easily transferred to an adjacent layer and can form a sufficient foamed carbonized layer can be provided. Further, it is possible to provide the laminates flame retardant composition is constructed using the laminate flame retardant sheets, and the flame retardant veneer.

Next, embodiments of the present invention will be described with some specific examples , comparative examples, and experimental examples . Note that the following examples are given to illustrate the present invention more specifically, and embodiments of the present invention are not limited to the following examples.

First, Table 1 shows the composition of the laminate flame retardant composition used in Examples , Comparative Examples, and Experimental Examples .
Numerical values represent parts by weight.

[Example 1] Composition 1 shown in Table 1 above was applied to a glass fiber nonwoven fabric of 35 g / m ² at 80 g / m ² to obtain a laminate flame-retardant sheet.

Next, a slurry in which 4 parts of melamine-formaldehyde resin and 91 parts of aluminum hydroxide were blended with 5 parts of phenol resin was prepared, and a 50 g / m ² glass fiber nonwoven fabric was immersed in this slurry, thereby A glass fiber nonwoven fabric was impregnated with the slurry so that the slurry solid content shown in Formula 2 was 2000% to obtain a prepreg.

In this case, from the above equation 2, the solid content weight after the slurry impregnation is 1050 g / m ^2, the slurry fraction is 1000 g / m ² subtracted the weight of the glass fiber nonwoven fabric from 1050 g / m ^2. Further, 1000 g / m ² contains 5 parts of phenol resin, 4 parts of melamine-formaldehyde resin, and 91 parts of aluminum hydroxide, so that the organic resin component is 90 g / m ² and the inorganic filler is 910 g / m ² . Therefore, the content (%) of the organic resin component calculated from the above-described Equation 1 of the prepreg is 8.6% by 90 / (50 + 90 + 910) × 100.

Next, plain paper decorative paper having a basis weight of 80 g / m ² was impregnated with melamine-formaldehyde resin so that the impregnation ratio represented by the following formula 3 was 100% to obtain a melamine resin-impregnated decorative paper.

Next, in order from the bottom, 4 sheets of the prepreg, 1 sheet of the laminated sheet flame retardant sheet, and 1 sheet of the melamine resin impregnated decorative paper are laminated, and 130 ° C. and 100 kg / cm using a flat finish plate. ^2. Hot-press molding was performed for 90 minutes to obtain a flame-retardant decorative board.

[Example 2]
Instead of the composition 1 used in Example 1, the composition 2 shown in Table 1 above was used, and a flame retardant decorative board was obtained in the same manner as in Example 1 above.

[Example 3]
Instead of the composition 1 used in Example 1, the composition 3 shown in Table 1 above was used, and the flame retardant decorative board was obtained in the same procedure as in Example 1 above.

[Example 4]
Instead of the composition 1 used in Example 1, the composition 4 shown in Table 1 above was used, and a flame retardant decorative board was obtained in the same procedure as in Example 1 above.

[Example 5]
Instead of the composition 1 used in Example 1, the composition 5 shown in Table 1 above was used, and a flame retardant decorative board was obtained in the same procedure as in Example 1 above.

[Example 6]
The composition 1 shown in Table 1, to obtain a laminate flame retardant sheet by 40 g / m ² coated on phenolic resin impregnated paper.

The laminate flame retardant sheet, instead of the laminate flame retardant sheet used in the above Example 1, the other in the same procedure as in Example 1 to obtain a flame retardant veneer.
[ Experimental Example 1 ]
A decorative board was obtained in the same procedure as in Example 1 except that the composition A1 shown in Table 1 above was used instead of the composition 1 used in Example 1.

[Comparative Example 1 ]
A decorative board was obtained in the same procedure as in Example 1 except that the composition B1 shown in Table 1 above was used instead of the composition 1 used in Example 1.

[Comparative Example 2 ]
A decorative board was obtained in the same procedure as in Example 1 except that the composition B2 shown in Table 1 was used instead of the composition 1 used in Example 1.

[Comparative Example 3 ]
A decorative board was obtained in the same procedure as in Example 1 except that the composition C1 shown in Table 1 above was used instead of the composition 1 used in Example 1.

Comparative Example 3 A decorative board was obtained in the same procedure as in Example 1 except that the composition C2 shown in Table 1 was used instead of the composition 1 used in Example 1.

[Comparative Example 5 ] A decorative board was obtained in the same procedure as in Example 1 except that the composition C3 shown in Table 1 was used instead of the composition 1 used in Example 1.

The decorative plate of the above-mentioned Examples , Comparative Examples, and Experimental Examples was tested by the following method.
[Nonflammability test] In the exothermic test / evaluation method of a 20 minute test using a cone calorimeter in conformity with ISO 5660, the total heat generation amount is 8 MJ / m ² or less, and the maximum heat generation rate continues for 10 seconds or more to 200 kW / m ² The case where it does not exceed is marked as ○.

  [Strength Test] A 500 g iron ball was dropped from the upper side of the sample 20 cm.

  [Adhesion Test] A 5 cm square test piece is boiled for 1 hour, dried at 70 ° C. for 2 hours, and then a cut knife is put in the decorative layer with a cutter knife to a depth reaching the core layer, and a cellophane tape is applied. The case where it peeled off rapidly and there was no peeling of the decorative layer was set as (circle), and the thing with peeling was set as x.

  The evaluation results for the above tests are shown in Table 2.

As mentioned above, although embodiment of this invention was described, this invention is not limited to said specific one Embodiment, In addition, it can implement with a various form.
In the above embodiment, some examples including a specific substance at a specific mixing ratio have been described. However, as described in the section of means for solving the problem, the present invention is a substance used in the above example. Other materials can be used, and the blending ratio can be arbitrarily adjusted within the range already described.

Claims (6)

5 to 60 parts by weight of a water-soluble organic substance that becomes a carbonized layer upon dehydration by phosphorus when subjected to heat accompanying combustion with respect to 100 parts by weight of surface-coated ammonium polyphosphate, 15 to 50 parts by weight of scale-like mica A laminated flame retardant composition characterized by comprising a part. Furthermore, a nitrogen-containing compound is mix | blended, The laminated board flame-retardant composition of Claim 1 characterized by the above-mentioned. It consists of the laminated board flame-retardant composition of Claim 1 or Claim 2 , and a fiber sheet, The said laminated board flame-retardant composition is applied to the surface of this fiber sheet, Laminated sheet flame retardant sheet. A laminate flame-retardant composition according to claim 1 or 2 , and a resin-impregnated paper impregnated with a resin liquid mainly composed of a thermosetting resin, the surface of the resin-impregnated paper sheet laminates flame retardant, characterized in that the laminate flame retardant composition is applied. A laminate flame-retardant sheet according to claim 3 or 4 , a resin-impregnated decorative paper, and a core layer formed by impregnating and drying a fiber sheet with a slurry containing a binder component and an inorganic filler. A flame retardant decorative board,
Of the front and back surfaces of the flame-retardant decorative board, at least one surface has a structure in which the resin-impregnated decorative paper, the laminated sheet flame-retardant sheet, and the core layer are laminated in this order from the outer surface side. Flame retardant decorative board characterized by The flame-retardant decorative board according to claim 5, wherein the fiber sheet forming the core layer is a glass fiber sheet.