JP2004209864A

JP2004209864A - Nonflammable decorative panel

Info

Publication number: JP2004209864A
Application number: JP2003000792A
Authority: JP
Inventors: Yutaka Hori; 豊堀; Tsuneo Mihashi; 恒夫三橋; Shoichi Onoda; 正一小野田; Akihiro Yamamoto; 晃広山本; Yukinori Kano; 征典加納; Kazumasa Hasegawa; 和正長谷川
Original assignee: Aica Kogyo Co Ltd
Current assignee: Aica Kogyo Co Ltd
Priority date: 2003-01-07
Filing date: 2003-01-07
Publication date: 2004-07-29

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonflammable decorative panel free from chipping at the time of cutting, the stripping of a decorative layer, the breaking-off of a corner at the time of application. <P>SOLUTION: This nonflammable decorative panel includes a core layer and a decorative layer, the core layer being composed of a prepreg obtained by impregnating an inorganic fiber nonwoven fabric base material with a slurry of an organic component and an inorganic filler. In addition, a resin-impregnated underlay paper obtained by impregnating the base material having a basis weight of 10 to 100g/m<SP>2</SP>with 50 to 300% of an organic component by a calculation method shown by formula 1: content(%)=[(weight of impregnated paper-weight of base material)/(weight of base material)]×100, is interposed between the decorative layer and the core layer. The content of the organic component in the prepreg is 3 to 20% by a calculation method shown by formula 2: content(%)=[(organic component)/(inorganic fiber nonwoven fabric base material+organic component+inorganic filler)]×100. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【産業上の利用分野】
本発明は、不燃化粧板に関する。
【０００２】
【特許文献１】特開昭５１−２０９８０
【特許文献２】特開平０８−２０７２０１
【従来の技術】
従来、防火、不燃性を付与した化粧板が知られており、可燃性の有機成分である有機樹脂をバインダー成分とするコア層は、不燃性能を確保するため有機成分含有量を少なくしていた。
【０００３】
【発明が解決しようとする課題】
従って、成形品の層間剥離強度が弱く、切断加工時切り口のチッピング、化粧層剥離、施工時の角かけ、凹み及び割れが発生することがあり、例えば、キッチン、コンロ廻りに使用した場合には、輻射熱による層間パンクが発生することがあった。
【０００４】
【課題を解決するための手段】
本発明は、かかる状況に鑑み検討されたもので、不燃性能を有し、かつ高い表面化粧層との密着性及び成形品の強度を確保することを目的とするもので、以下のことを特徴とする。
【０００５】
すなわち、請求項１に記載の発明は、コア層と化粧層を含む不燃化粧板であって、コア層が、無機繊維不織布基材に有機成分と無機充填剤とからなるスラリーが含浸されたプリプレグから構成されるとともに、該化粧層と該コア層との間に、坪量が１０〜１００ｇ／ｍ^２の基材に、式１で示される算出方法で５０〜３００％の有機成分を含浸せしめた樹脂含浸アンダーレイ層を介在させてなることを特徴とする不燃化粧板である。
【式１】

【０００６】
また、請求項２に記載の発明は、該プリプレグ中の有機成分の含有率が、式２の算出方法で、３〜２０％であることを特徴とする請求項１記載の不燃化粧板である。
【式２】

以下、本発明について詳細に説明する。
【０００７】
本発明で構成されるコア層は、無機繊維不織布に有機成分と無機充填剤を含浸させたプリプレグからなるもので、無機繊維としては、ガラス繊維、ロックウール、炭素繊維などが挙げられる。有機成分としては、フェノール−ホルムアルデヒド樹脂、アミノ−ホルムアルデヒド樹脂、ウレタン樹脂など特に難燃性を有する樹脂が挙げられ、無機充填剤としては、水酸化アルミニウム、水酸化マグネシウム、炭酸カルシウム、シリカなどが挙げられる。無機繊維不織布の坪量は、１０〜２００ｇ／ｍ^２の範囲が好適である。
無機充填剤の中では、平均粒子径が０．５〜２００μｍの範囲のものが無機性繊維不織布への含浸が可能であり、水酸化アルミニウムや水酸化マグネシウムなど結晶水を含むものは高温時に分解し、吸熱、結合水を放出するため不燃性の効果の点で最適である。
【０００８】
無機繊維不織布へのスラリー固形分定着率（％）は、式３で示される算出方法で、５００〜３０００％の範囲が好ましい。
【式３】

【０００９】
化粧層とコア層の間に介在させる樹脂含浸アンダーレイ層は、坪量が１０〜１００ｇ／ｍ^２の紙に、式１で示される算出方法で５０〜３００％が好ましく、プリプレグにおいては式２で示される算出方法で３〜２０％とするのが好ましい。このように、コア層の有機分を低減し、樹脂含浸アンダーレイ層に含まれる有機樹脂成分の量をプリプレグのものより多くすることにより、不燃性を有し、化粧層とコア層の密着性を確保することができる。
すなわち、上限を超えると有機成分が多くなり不燃性能が低下し、また下限に満たないと密着性が劣り層間剥離しやすくなる。
また、アンダーレイ基材の坪量が１０ｇ／ｍ^２未満では、含浸時切断しやすく作業性が悪く、１００ｇ／ｍ^２を超えると、不燃性が劣りやすくなる。
【式１】

【００１０】
フェノール樹脂は、フェノール類とアルデヒド類とをフェノール性水酸基１モルに対してアルデヒド類を１〜３モルの割合で塩基性触媒下或いは酸性触媒下にて反応させて得られるもので、フェノール類としては、フェノール、クレゾール、キシレノール、オクチルフェノール、フェニルフェノール、ビスフェノールＡ、ビスフェノールＳ、ビスフェノールＦなどが挙げられ、アルデヒド類としては、ホルムアルデヒド、パラホルムアルデヒド、グリオキザール、トリオキザールなどが挙げられる。
また、必要に応じてパラトルエンスルフォンアミド、桐油、燐酸エステル類、グリコール類などの可塑化を促す変性剤で変性されたものも適用でき、塩基性触媒としては、ナトリウム、カリウムなどのアルカリ金属、及びマグネシウム、カルシウムなどのアルカリ土類金属の酸化物や水酸化物、及びトリエチルアミン、トリエタノールアミンなどのアミン類、アンモニアが挙げられ、酸性触媒としては、パラトルエンスルフォン酸、塩酸などが挙げられる。
【００１１】
アミノ−ホルムアルデヒド樹脂としてはアミノ化合物、例えばメラミン、尿素、ベンゾグアナミン、アセトグアナミンなどとホルムアルデヒドを反応させた初期縮合物のほか、メチルアルコール、ブチルアルコールなどの低級アルコ−ルによるエ−テル化、パラトルエンスルホンアミドなどの可塑化を促す反応性変性剤で変性されたものが適用でき、中でも耐久性に優れるメラミン−ホルムアルデヒド樹脂が好ましい。
【００１２】
ウレタン樹脂は、トリレンジイソシアネート、ジフェニルメタンジイソシアネート、キシリレンジイソシアネート、ヘキサメチレンジイソシアネート、イソホロンジイソシアネート等のイソシアネート基を有する化合物を原料とするプレポリマー、アダクト体、ブロックイソシアネートなどが挙げられる。
【００１３】
コア層の少なくとも片面には化粧層が形成され、形成方法としては、コア層とアンダーレイ層を積層一体化した後、塗装を施す方法や、樹脂含浸化粧紙とアンダーレイ層とコア層とを一体成形する方法、化粧コート紙とアンダーレイ層とコア層とを一体成形する方法、転写箔を用いて化粧層を転写する方法などが挙げられる。
【００１４】
塗装による手段としては、顔料により着色された不飽和ポリエステル樹脂に、硬化剤として、例えば、メチルエチルケトンパ−オキサイド、硬化促進剤として、例えば、ナフテン酸コバルトなどを配合した樹脂液をコア成形物上に塗布し、次いで塗布面をビニロンフィルムで被覆し、ローラーで延展し、樹脂が硬化した後にビニロンフィルムを剥がせばよい。
【００１５】
不飽和ポリエステル樹脂は、不飽和二塩基酸及び／又はその酸無水物と必要に応じて用いられるその他の飽和酸及び／又はその酸無水物とを含む酸成分と、多価アルコールとを窒素やアルゴンなどの不活性ガス雰囲気下で１６０〜２３０℃程度、好ましくは２１０〜２３０℃で常法に従い脱水縮合反応させ、重合性モノマー、例えばスチレンモノマーを加えたものである。
【００１６】
樹脂含浸化粧紙による方法としては、無機繊維不織布に有機成分と無機充填剤を含有させたプリプレグと樹脂含浸化粧紙との間に、樹脂成分の含有率が高い樹脂含浸アンダーレイ紙を介在させて積層し、熱圧成形するもので、樹脂含浸化粧紙としては、アミノ−ホルムアルデヒド樹脂、ジアリルフタレート樹脂、不飽和ポリエステル樹脂などの熱硬化性樹脂からなる樹脂液を、化粧板用の３０〜１４０ｇ／ｍ^２の化粧紙に式４で示される含浸率が８０〜３００％含浸したものが適用できる。熱圧成形は平板プレス、連続プレスなどのプレス機でを用いればよい。
【式４】

【００１７】
コート紙による方法としては、無機繊維不織布に有機成分と無機充填剤を含有させたプリプレグと、表面にコート樹脂層を形成した化粧コート紙との間に樹脂成分含有率が高い樹脂含浸アンダーレイ層を介在させて積層し、熱圧成形する。アンダーレイ層は、坪量が１０〜６０ｇ／ｍ^２の薄紙基材に、アミノ−ホルムアルデヒド樹脂、ブチラール樹脂、フェノール樹脂、不飽和ポリエステル樹脂、ジアリルフタレート樹脂、ウレタン樹脂、エポキシ樹脂、アクリル樹脂、酢酸ビニル樹脂、ＥＶＡ樹脂等の接着性を有する樹脂或いはこれらの混合物が式１で示される含有率が５０〜３００％含浸したものが適用できる。
樹脂含浸化粧紙をコア層の片面のみに配する際は、反りを抑制するため不燃性を損なわない程度にもう片方の面にバランス層を配してもよい。
【００１８】
【実施例】
以下、実施例を挙げてより詳細に説明するが、本発明をより具体的に示すものであって、特に限定するものではない。
実施例１
コア層
５０ｇ／ｍ^２のガラス繊維不織布に、フェノール−ホルムアルデヒド樹脂５部に対して、水酸化アルミニウムを９５部配合したスラリーを、式３に示す固形分率が１６００％となるように含浸してプリプレグ（Ａ_２）を得た。
樹脂含浸アンダーレイ紙
１３ｇ／ｍ^２の薄紙に、フェノール樹脂含有率が式１の算出方法で１５０％となるように含浸し、乾燥し樹脂含浸アンダーレイ紙（Ａ_１）を得た。
化粧層
坪量８０ｇ／ｍ^２の無地柄の化粧紙に，メラミン−ホルムアルデヒド樹脂を式１で示す含浸率が１００％となるように含浸してメラミン樹脂含浸化粧紙（Ａ_３）を得た。
バランス紙
坪量４０ｇ／ｍ^２のクラフト紙にメラミン−ホルムアルデヒド樹脂を含浸量が１２０％となるように含浸してメラミン樹脂含浸バランス紙（Ａ_４）を得た。
不燃化粧板
下から順に、メラミン樹脂含浸バランス紙（Ａ_４）を１枚、コア層のプリプレグ（Ａ_２）を４枚、樹脂含浸アンダーレイ紙（Ａ_１）を１枚、メラミン樹脂含浸化粧紙（Ａ_３）を１枚、積層して、フラット仕上げプレートを用いて１３０℃，１００ｋｇ／ｃｍ^２、９０分間の条件で熱圧成形して実施例１の不燃化粧板を得た。
【００１９】
実施例２
実施例１において、化粧層として、坪量２３ｇ／ｍ^２で酸化チタンを含有し木目柄が印刷され、印刷面に、５μｍのアクリルウレタンハードコート層が設けられた化粧コート紙を用い、１３ｇ／ｍ^２の薄紙に、メラミン樹脂含有率が式１の算出方法で２５０％となるように含浸し、乾燥し樹脂含浸アンダーレイ紙（Ｂ_２）を用いた以外は同様に実施して、実施例２の不燃化粧板を得た。
【００２０】
比較例１
実施例１において、樹脂含浸アンダーレイ紙を用いなかった以外は同様に実施して、比較例１の積層板を得た。
【００２１】
比較例２
実施例１において、樹脂含浸アンダーレイ紙の含浸率を式１の算出方法で３０％とした以外は同様に実施して、比較例２の積層板を得た。
【００２２】
比較例３
実施例１において、樹脂含浸アンダーレイ紙の含浸率を３２０％とした以外は同様に実施して、比較例３の積層板を得た。
【００２３】
比較例４
実施例２において、樹脂含浸アンダーレイ紙を用いなかった以外は同様に実施して、比較例４の積層板を得た。
【００２４】
比較例５
実施例２において、樹脂含浸アンダーレイ紙のメラミン樹脂含有率を５０％とした以外は同様に実施して、比較例５の積層板を得た。
【００２５】
評価結果を表１に示す。
【表１】

【００２６】
試験方法は以下の通りとした。
不燃性：ＪＩＳＡ１３２１「建築物の内装材料及び工法の難燃性試験方法に基づき評価した。
密着性：木工用の回転鋸刃にてカットし、切り口断面を評価した。
【００２７】
【発明の効果】
本発明は、コア層が無機繊維不織布に有機成分と無機充填剤からなるスラリーが含浸されたプリプレグから構成され、化粧層とコア層との間に、樹脂含浸アンダーレイ紙を介在させることにより、不燃性能を維持し、かつより高い表面化粧層との密着性及び成形品強度を実現することができる。
また、切断加工時のチッピング、化粧層剥離、施工作業時の角かけ、凹み及び割れなどがなく、コンロ廻り使用した場合、輻射熱による層間パンクの発生がない。
【図面の簡単な説明】
【図１】実施例１の不燃化粧板の構成断面図。
【符号の説明】
１樹脂含浸アンダーレイ紙
２プリプレグ
３化粧層
４バランス層
６不燃化粧板[0001]
[Industrial applications]
The present invention relates to a nonflammable decorative board.
[0002]
[Patent Document 1] JP-A-51-20980
[Patent Document 2] JP-A-08-207201
[Prior art]
Heretofore, decorative panels provided with fire protection and nonflammability have been known, and a core layer containing an organic resin as a flammable organic component as a binder component has a reduced organic component content in order to ensure nonflammability performance. .
[0003]
[Problems to be solved by the invention]
Therefore, the delamination strength of the molded product is weak, chipping of the cut at the time of cutting processing, peeling of the decorative layer, squaring at the time of construction, dents and cracks may occur, for example, when used in the kitchen, around the stove In some cases, interlayer puncture may occur due to radiant heat.
[0004]
[Means for Solving the Problems]
The present invention has been studied in view of the above circumstances, has a non-flammable property, and aims to ensure high adhesion to a surface decorative layer and strength of a molded product, and has the following features. And
[0005]
That is, the invention according to claim 1 is a non-combustible decorative plate including a core layer and a decorative layer, wherein the core layer is a prepreg in which a slurry comprising an organic component and an inorganic filler is impregnated into an inorganic fiber nonwoven base material. And between the decorative layer and the core layer, a base material having a basis weight of 10 to 100 g / m ² is impregnated with 50 to 300% of an organic component by a calculation method represented by Formula 1. And a resin-impregnated underlay layer.
(Equation 1)

[0006]
The invention according to claim 2 is the non-combustible decorative board according to claim 1, wherein the content of the organic component in the prepreg is 3 to 20% according to the calculation method of the formula (2). .
[Equation 2]

Hereinafter, the present invention will be described in detail.
[0007]
The core layer constituted by the present invention is made of a prepreg in which an organic component and an inorganic filler are impregnated in an inorganic fiber nonwoven fabric, and examples of the inorganic fiber include glass fiber, rock wool, and carbon fiber. Examples of the organic component include phenol-formaldehyde resin, amino-formaldehyde resin, and resins having particularly flame retardance such as urethane resin, and examples of the inorganic filler include aluminum hydroxide, magnesium hydroxide, calcium carbonate, and silica. Can be The basis weight of the inorganic fiber nonwoven fabric is preferably in the range of 10 to ²⁰⁰ g / m2.
Among the inorganic fillers, those having an average particle size in the range of 0.5 to 200 μm can impregnate the inorganic fiber nonwoven fabric, and those containing water of crystallization such as aluminum hydroxide and magnesium hydroxide decompose at high temperatures. It is optimal in terms of noncombustibility because it absorbs heat and releases bound water.
[0008]
The fixing ratio (%) of the slurry solid content to the inorganic fiber non-woven fabric is preferably in the range of 500 to 3000% by the calculation method shown in Expression 3.
[Equation 3]

[0009]
The resin-impregnated underlay layer interposed between the decorative layer and the core layer is preferably from 50 to 300% by a calculation method represented by Formula 1 on paper having a basis weight of 10 to 100 g / m ² , and in a prepreg, Formula 2 Is preferably set to 3 to 20% by the calculation method represented by Thus, by reducing the organic content of the core layer and increasing the amount of the organic resin component contained in the resin-impregnated underlay layer compared to that of the prepreg, it has nonflammability and the adhesion between the decorative layer and the core layer. Can be secured.
That is, when the amount exceeds the upper limit, the amount of organic components increases, and the nonflammability decreases. On the other hand, when the amount is less than the lower limit, adhesion is poor and delamination tends to occur.
If the basis weight of the underlay base material is less than 10 g / m ^2, it is easy to cut during impregnation, resulting in poor workability. If it exceeds 100 g / m ² , the incombustibility tends to be poor.
(Equation 1)

[0010]
The phenolic resin is obtained by reacting phenols and aldehydes with aldehydes at a ratio of 1 to 3 moles per mole of phenolic hydroxyl groups under a basic catalyst or an acidic catalyst. Examples include phenol, cresol, xylenol, octylphenol, phenylphenol, bisphenol A, bisphenol S, bisphenol F, and the like, and aldehydes include formaldehyde, paraformaldehyde, glyoxal, and trioxal.
If necessary, para-toluenesulfonamide, tung oil, phosphates, those modified with a modifier that promotes plasticization such as glycols can also be applied.As the basic catalyst, 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 the acidic catalyst include paratoluenesulfonic acid and hydrochloric acid.
[0011]
Examples of the amino-formaldehyde resin include an initial condensate obtained by reacting an amino compound such as melamine, urea, benzoguanamine, acetoguanamine and the like with formaldehyde, etherification with a lower alcohol such as methyl alcohol and butyl alcohol, and paratoluene. Those modified with a reactive modifier which promotes plasticization such as sulfonamide can be used, and among them, a melamine-formaldehyde resin having excellent durability is preferable.
[0012]
Examples of the urethane resin include prepolymers, adducts, and blocked isocyanates made from compounds having an isocyanate group such as tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.
[0013]
A decorative layer is formed on at least one side of the core layer, and as a forming method, a method of applying a coating after laminating and integrating the core layer and the underlay layer, or a resin impregnated decorative paper, an underlay layer, and a core layer Examples thereof include a method of integrally forming, a method of integrally forming a decorative coated paper, an underlay layer, and a core layer, and a method of transferring a decorative layer using a transfer foil.
[0014]
As means by coating, a resin liquid in which an unsaturated polyester resin colored with a pigment is blended with a curing agent, for example, methyl ethyl ketone peroxide, as a curing accelerator, for example, cobalt naphthenate, on the core molded product. After applying, 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.
[0015]
The unsaturated polyester resin is obtained by converting an acid component containing an unsaturated dibasic acid and / or an acid anhydride thereof, and optionally another saturated acid and / or an acid anhydride thereof, and a polyhydric alcohol with nitrogen or the like. It is obtained by subjecting a dehydration condensation reaction to about 160 to 230 ° C., preferably 210 to 230 ° C. in a conventional manner in an atmosphere of an inert gas such as argon and adding a polymerizable monomer such as a styrene monomer.
[0016]
As a method using a resin-impregnated decorative paper, a resin-impregnated underlay paper having a high content of a resin component is interposed between a prepreg containing an organic component and an inorganic filler in an inorganic fiber nonwoven fabric and a resin-impregnated decorative paper. Laminated and hot-pressed, resin-impregnated decorative paper is a resin liquid composed of a thermosetting resin such as an amino-formaldehyde resin, a diallyl phthalate resin, an unsaturated polyester resin, and the like. impregnation ratio of formula 4 in m ² of the decorative sheet can be applied those impregnated 80-300%. Hot pressing may be performed using a press machine such as a flat plate press or a continuous press.
(Equation 4)

[0017]
As a method using a coated paper, a resin-impregnated underlay layer having a high resin component content between a prepreg containing an organic component and an inorganic filler in an inorganic fiber nonwoven fabric and a decorative coated paper having a coated resin layer formed on the surface. Are laminated, and hot-pressed. The underlay layer is formed on a thin paper base material having a basis weight of 10 to 60 g / m ² by adding amino-formaldehyde resin, butyral resin, phenol resin, unsaturated polyester resin, diallyl phthalate resin, urethane resin, epoxy resin, acrylic resin, acetic acid An adhesive resin such as a vinyl resin or an EVA resin or a mixture of these resins impregnated with a content of 50 to 300% represented by Formula 1 can be applied.
When disposing the resin-impregnated decorative paper on only one side of the core layer, a balance layer may be disposed on the other side so as not to impair the incombustibility in order to suppress warpage.
[0018]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples. However, the present invention is more specifically shown and is not particularly limited.
Example 1
A glass fiber non-woven fabric having a core layer of 50 g / m ² is impregnated with a slurry obtained by mixing 95 parts of aluminum hydroxide with respect to 5 parts of a phenol-formaldehyde resin so that the solid content shown in Formula 3 becomes 1600%. A prepreg (A ₂ ) was obtained.
Thin paper of 13 g / m ² of resin-impregnated underlay paper was impregnated with a phenolic resin content of 150% by the calculation method of Formula 1 and dried to obtain a resin-impregnated underlay paper (A ₁ ).
A decorative paper with a plain pattern having a basis weight of 80 g / m ² was impregnated with a melamine-formaldehyde resin so that the impregnation ratio represented by the formula 1 became 100%, to obtain a melamine resin-impregnated decorative paper (A ₃ ).
Kraft paper having a basis weight of 40 g / m ² was impregnated with a melamine-formaldehyde resin so as to have an impregnation amount of 120% to obtain a melamine resin-impregnated balance paper (A ₄ ).
In order from the bottom of the non-combustible decorative plate, one sheet of melamine resin impregnated balance paper (A ₄ ), four sheets of prepreg (A ₂ ) of the core layer, one sheet of resin impregnated underlay paper (A ₁ ), and melamine resin impregnated decorative paper One piece of (A ₃ ) was laminated, and hot-pressed at 130 ° C., 100 kg / cm ² for 90 minutes using a flat finish plate to obtain a non-combustible decorative board of Example 1.
[0019]
Example 2
In Example 1, as a decorative layer, a decorative paper containing titanium oxide with a basis weight of 23 g / m ² , a woodgrain pattern printed thereon, and a printed surface provided with a 5 μm acrylic urethane hard coat layer was used. the thin paper m ^2, a melamine resin content impregnated such that 250% by the method of calculating the equation 1, is carried out analogously except for using the dried resin impregnated underlay papers (B _2), example 2 was obtained.
[0020]
Comparative Example 1
A laminate of Comparative Example 1 was obtained in the same manner as in Example 1, except that the resin-impregnated underlay paper was not used.
[0021]
Comparative Example 2
A laminated board of Comparative Example 2 was obtained in the same manner as in Example 1, except that the impregnation rate of the resin-impregnated underlay paper was changed to 30% by the calculation method of Expression 1.
[0022]
Comparative Example 3
A laminate of Comparative Example 3 was obtained in the same manner as in Example 1, except that the impregnation rate of the resin-impregnated underlay paper was changed to 320%.
[0023]
Comparative Example 4
A laminate of Comparative Example 4 was obtained in the same manner as in Example 2, except that the resin-impregnated underlay paper was not used.
[0024]
Comparative Example 5
A laminated board of Comparative Example 5 was obtained in the same manner as in Example 2, except that the melamine resin content of the resin-impregnated underlay paper was changed to 50%.
[0025]
Table 1 shows the evaluation results.
[Table 1]

[0026]
The test method was as follows.
Non-flammability: JIS A 1321 “Evaluation was performed based on the flame-retardant test method for building interior materials and construction methods.
Adhesion: Cut with a rotary saw blade for woodwork, and the cut cross section was evaluated.
[0027]
【The invention's effect】
The present invention, the core layer is composed of a prepreg impregnated with a slurry comprising an organic component and an inorganic filler in an inorganic fiber nonwoven fabric, by interposing a resin-impregnated underlay paper between the decorative layer and the core layer, The non-combustible performance can be maintained, and higher adhesiveness to the surface decorative layer and higher molded product strength can be realized.
In addition, there is no chipping at the time of cutting, peeling of the decorative layer, cornering at the time of the construction work, dents and cracks, and there is no generation of interlayer puncture due to radiant heat when used around a stove.
[Brief description of the drawings]
FIG. 1 is a configuration sectional view of a non-combustible decorative board according to a first embodiment.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 resin-impregnated underlay paper 2 prepreg 3 decorative layer 4 balance layer 6 non-combustible decorative board

Claims

A non-combustible decorative board comprising a core layer and a decorative layer, wherein the core layer is composed of a prepreg in which a slurry comprising an organic component and an inorganic filler is impregnated into an inorganic fiber nonwoven base material, and the decorative layer and the decorative layer A resin-impregnated underlay layer obtained by impregnating a base material having a basis weight of 10 to 100 g / m ² with an organic component of 50 to 300% by a calculation method represented by Formula 1 is interposed between the core layer and the core layer. A non-combustible decorative plate characterized by the following.
(Equation 1)

The non-combustible decorative board according to claim 1, wherein the content of the organic component in the prepreg is 3 to 20% according to the calculation method of Equation (2).
[Equation 2]