JPH0949199A - Flameproof paper for backing of vinyl wall paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain flameproof paper for backing of vinyl wall paper having slight pin-holes, excellent formation and flameproof effect with a small amount of flame retardant by applying or impregnating a guanidine-based flame retardent to a sheet comprising fibers and an inorganic material. SOLUTION: This flameproof paper for backing of vinyl wall paper having <100g/m<2> basis weight is obtained by adding inorganic powder such as calcium carbonate and an inorganic fibrous material such as 'SANPI' (inorganic fibrous material mainly composed of sepiolite) to a pulp slurry formed by disaggregating and beating a (1:1) mixture of needle-leaved tree bleached kraft pulp and broad- leaved tree bleached kraft pulp and mixing to obtain a sheet, and applying or impregnating a guanidine-based flame retardant such as guanidine sulfamate on the sheet. An adding amount of the inorganic material is 20-50wt.% calcium carbonate and 2-10wt.% 'SANPI' based on total weight of the flameproof paper to reduce a using amount of the flameproof agent.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、ビニル壁紙の裏打
ちに用いられる難燃紙に関し、特に無機物質担持量を多
くすることにより難燃性を付与するべく必要とする高価
な難燃剤量の低減を可能ならしめ、低コスト化したビニ
ル壁紙裏打ち用難燃紙に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant paper used for lining vinyl wallpaper, and particularly, to reduce the amount of expensive flame retardant required to impart flame retardancy by increasing the amount of an inorganic substance carried. The present invention relates to a flame-retardant paper for backing vinyl wallpaper, which enables low cost.

【０００２】[0002]

【従来の技術】難燃紙は壁装材料などとして広く用いら
れており、ビニル壁紙裏打ち用基材としても使用されて
いる。BACKGROUND ART Flame-retardant paper is widely used as a wall covering material and the like, and is also used as a base material for backing vinyl wallpaper.

【０００３】難燃紙としては、紙に難燃剤を塗布あるい
は含浸したもの、あるいはセルロ−スパルプに難燃性の
有機物質や無機物質を湿式抄紙法により含有せしめたも
のが知られている。代表的なものとしては、難燃剤とし
てスルファミン酸グアニジンを紙に含浸処理した難燃紙
や、無機質粉体として水酸化アルミニウムをパルプと混
合抄紙した無機質シ−トがある。Known flame-retardant papers are papers coated or impregnated with a flame-retardant agent, or cellulose pulps containing a flame-retardant organic or inorganic substance by a wet papermaking method. Typical examples include a flame-retardant paper obtained by impregnating paper with guanidine sulfamate as a flame retardant, and an inorganic sheet obtained by mixing aluminum hydroxide with pulp as an inorganic powder into paper.

【０００４】壁紙裏打ち用基材として使用されている無
機質シ−トは、一般に米坪量が１２０〜１３０ｇ／ｍ²
であることに対して、難燃剤を含浸処理してなる難燃紙
は７０〜８０ｇ／ｍ² と低米坪量のものが主として用い
られている。従って、難燃紙の場合には低米坪量の下に
強度を発現させる必要があるので、おのずから無機物質
の含有割合が制約を受ける。The inorganic sheet used as a base material for wallpaper lining generally has a rice basis weight of 120 to 130 g / m ^2.
On the other hand, the flame-retardant paper impregnated with the flame-retardant agent is mainly 70 to 80 g / m ² and has a low basis weight of rice. Therefore, in the case of flame-retardant paper, it is necessary to develop strength under a low basis weight of rice, which naturally limits the content ratio of the inorganic substance.

【０００５】難燃紙は機械的強度を得るためにパルプの
叩解を行うが、機械的強度の一つである引裂強度を高く
するためには、パルプの叩解フリ−ネスを高くする必要
が生じ、機械的強度の一つである引張強さを高くするた
めには、パルプの叩解フリ−ネスを低く設定する必要が
生じる。Flame-retardant paper beats pulp to obtain mechanical strength, but in order to increase tear strength, which is one of the mechanical strengths, it is necessary to increase beaten freeness of pulp. In order to increase the tensile strength, which is one of the mechanical strengths, it is necessary to set the beating freeness of pulp low.

【０００６】濾水性の高いスラリ−を用いると、ワイヤ
−上に於ける水切れ性が良好となるが急速脱水による地
合の悪化や填料脱落により紙匹にピンホ−ルが発生する
等のトラブルを誘起する。一方、濾水性の低いスラリ−
を用いると、ワイヤ−上に於ける保水性が良好となる
が、抄紙速度の低下あるいはプレス工程での紙匹の砕け
トラブル等を招く。従って、難燃紙に要求される物性と
抄紙機の能力のバランスを考えてパルプの叩解フリ−ネ
スが設定される。一般的に濾水度は５００〜５５０ｍｌ
（ｃ．ｓ．ｆ．、以下同じ）位に設定されることが多い
が、特開平２−６１２００号公報、特開平２−２２１４
９６号公報、特開平４−２８１０９９号公報に記載され
るが如く、殆どがその下限である５００ｍｌに設定され
る。When a slurry having a high drainage property is used, the water drainage property on the wire is improved, but problems such as deterioration of the texture due to rapid dehydration and pinholes on the paper due to dropping of the filler may occur. Induce. On the other hand, a slurry with low drainage
When the above is used, the water-holding property on the wire is improved, but it causes a decrease in the papermaking speed or a trouble of breaking the web in the pressing step. Therefore, the beating freeness of pulp is set in consideration of the balance between the physical properties required for flame-retardant paper and the capability of the paper machine. Generally the freeness is 500-550 ml
It is often set to the (c.s.f., the same applies hereinafter), but it is not disclosed in JP-A-2-61200 and JP-A-2-2214.
As described in Japanese Patent Laid-Open No. 96-281099 and Japanese Patent Laid-Open No. 281099/1992, most of the lower limit is set to 500 ml.

【０００７】このような理由から従来の難燃紙はパルプ
の叩解を進めて叩解フリ−ネスを低く設定し引張強さを
発現させる反面、引裂強度を確保すべく無機物質の配合
割合を１０重量％程度に抑え、残りの有機物に対して高
価な難燃剤を２１〜２２重量％含浸処理している。For these reasons, the conventional flame-retardant paper develops the beating freeness by setting the beating freeness to a low level by developing the beating of the pulp, but on the other hand, the blending ratio of the inorganic substance is 10% in order to secure the tear strength. %, And 21 to 22% by weight of an expensive flame retardant is impregnated into the remaining organic matter.

【０００８】[0008]

【発明が解決しようとする課題】上述したように、従来
の難燃紙は一般に、無機物質の配合割合を１０重量％程
度に抑え、残りの有機物に対して高価な難燃剤を含浸処
理しているため、コストアップを招いている。かような
コストアップを避けるためには、シート中の有機物をい
かにして減少させるかという点が課題となる。この課題
を解決するためには、当然のことながらシート中の無機
物質を増量させればよいが、無機物質を増量すると、前
記した如く紙力の低下、急速脱水による地合不良、填料
の脱落による紙匹中のピンホールの増大を招く。As described above, in the conventional flame-retardant paper, generally, the blending ratio of the inorganic substance is suppressed to about 10% by weight, and the remaining organic substance is impregnated with an expensive flame retardant. Therefore, the cost is increased. In order to avoid such an increase in cost, the issue is how to reduce the organic substances in the sheet. In order to solve this problem, it is natural that the amount of the inorganic substance in the sheet should be increased. However, if the amount of the inorganic substance is increased, as described above, the paper strength is reduced, the formation is poor due to rapid dehydration, and the filler is dropped. Causes an increase in pinholes in the web.

【０００９】そこで本発明の目的は、繊維と無機物質か
らなるシートに難燃剤を塗布または含浸せしめることに
より難燃性を付与したビニル壁紙裏打ち用難燃紙におい
て、従来の難燃紙よりも難燃化に必要とする高価な難燃
剤量を低減し、ビニル壁紙裏打ち紙のコストを低減し、
かつ紙力の低下や地合不良を改善し、紙匹中のピンホー
ルの発生を少なくすることにある。Therefore, an object of the present invention is to provide a flame-retardant paper for backing vinyl wallpaper, which is provided with flame-retardant properties by applying or impregnating a sheet made of fibers and an inorganic substance with a flame-retardant agent, which is more difficult than conventional flame-retardant papers. Reduce the amount of expensive flame retardant required for combustion, reduce the cost of vinyl wallpaper backing paper,
In addition, it is to reduce the paper strength and poor formation and reduce the occurrence of pinholes in the web.

【００１０】[0010]

【課題を解決するための手段】本発明者らは、繊維と無
機物質を混合抄紙したシ−トに、難燃剤を塗布または含
浸せしめてなる米坪量１００ｇ／ｍ² 未満のビニル壁紙
裏打ち用難燃紙において、難燃化に必要とする高価な難
燃剤量を低減すべく鋭意研究した結果、シ−ト中の有機
分を減少させることは当然ながら、更に繊維状の無機物
質である山皮を担持させると難燃性向上に有効であるこ
とを見い出した。DISCLOSURE OF THE INVENTION The inventors of the present invention use a sheet made by mixing fibers and an inorganic substance for papermaking, and coating or impregnating a flame retardant on the sheet for lining vinyl wallpaper having a basis weight of less than 100 g / m ² . As a result of intensive research to reduce the amount of expensive flame retardant required for flame retardancy in flame-retardant paper, it is natural that organic content in the sheet is reduced, and as a matter of course, it is a fibrous inorganic substance. It was found that supporting the skin is effective in improving the flame retardancy.

【００１１】すなわち本発明によるビニル壁紙裏打ち用
難燃紙は、繊維と無機物質からなるシ−トに難燃剤を塗
布または含浸せしめることにより難燃性を付与した米坪
量１００ｇ／ｍ² 未満のビニル壁紙裏打ち用難燃紙であ
って、前記無機物質として、（１）無機質粉体を難燃紙
全重量当り２０重量％以上５０重量％以下、および
（２）山皮を難燃紙全重量当り２重量％以上１０重量％
以下含有することを特徴とするものである。That is, the flame-retardant paper for backing vinyl wallpaper according to the present invention has a flame retardant imparted by coating or impregnating a sheet composed of fibers and an inorganic substance with a basis weight of less than 100 g / m ² . A flame-retardant paper for backing vinyl wallpaper, wherein, as the inorganic substance, (1) inorganic powder is 20% by weight or more and 50% by weight or less based on the total weight of the flame-retardant paper, and (2) mountain bark is the total weight of the flame-retardant paper. 2% by weight or more and 10% by weight
It is characterized by containing the following.

【００１２】[0012]

【発明の実施の形態】本発明の難燃紙の燃焼性を評価す
べくＪＩＳ−Ｚ−２１５０に示す防炎試験に於ける難燃
紙の燃焼挙動を観察すると、燃焼炎の伝達が繊維状無機
物質である山皮の存在する場所において停止するので、
炭化長を短くすることが可能となる。特願平６−２３５
３０６号公報では繊維状無機物質としてガラス繊維を用
いているが、ガラス繊維を併用することにより燃焼炎の
伝達停止機能は認められるも、濾水性がより向上し、そ
の結果、急速脱水による地合の悪化や填料脱落によるピ
ンホ−ルの増大を招くので、パルプの叩解フリ−ネス、
紙の米坪範囲の異なる難燃紙には適用できない。BEST MODE FOR CARRYING OUT THE INVENTION When observing the combustion behavior of the flame-retardant paper in the flameproof test shown in JIS-Z-2150 to evaluate the flammability of the flame-retardant paper of the present invention, the transmission of the combustion flame is fibrous. Because it stops at the place where the mountain bark, which is an inorganic substance, exists
It becomes possible to shorten the carbonization length. Japanese Patent Application No. 6-235
Although glass fiber is used as a fibrous inorganic substance in Japanese Patent No. 306, the combined use of glass fiber allows the combustion flame transmission stopping function to be recognized, but drainage is further improved, and as a result, formation by rapid dehydration is formed. Of the beating pulp, as it causes an increase in pinholes due to deterioration of
It cannot be applied to flame-retardant papers with different tsubo ranges.

【００１３】本発明では繊維状無機物質として山皮を用
いる。山皮は保水性に富み、濾水性を低下させる効果が
あるため、パルプの叩解フリ−ネスの高い、即ち濾水度
の高い原料で抄紙する場合でも地合の悪化、填料の脱落
を防止する機能が認められた。従って、山皮を併用する
ことにより防炎性能の向上と無機物質の配合割合の向上
を可能ならしむることができた。即ち、パルプ量が減り
山皮の燃焼炎伝達停止能力により必要とする防炎性能を
達成すべく配合する難燃剤量を従来より低減ならしむる
ことができた。In the present invention, mountain bark is used as the fibrous inorganic substance. Mountain bark is highly water-retentive and has the effect of lowering drainage, so it prevents deterioration of formation and loss of filler even when paper is made with a material having a high beating freeness of pulp, that is, a material with high freeness. Function was recognized. Therefore, it was possible to improve the flameproof performance and the blending ratio of the inorganic substances by using the mountain bark together. That is, it was possible to reduce the amount of the flame retardant compounded to achieve the required flameproof performance by reducing the amount of pulp and the combustion flame transmission stopping ability of the mountain bark compared to the conventional case.

【００１４】なお、無機物質の担持量を増加すると紙力
が低下するが、紙力については引張強さは溶解性ビニロ
ンバインダ−等の紙力増強剤の併用、引裂強度について
はパルプの叩解度にて対応することができる。Although the paper strength decreases as the amount of the inorganic substance carried increases, the tensile strength of paper strength is a combination of paper strength enhancers such as soluble vinylon binder, and the breaking strength of pulp is the strength of tear. You can deal with it.

【００１５】原紙の繊維原料としては、針葉樹晒クラフ
トパルプ（ＮＢＫＰ）、針葉樹半晒クラフトパルプ（Ｎ
ＳＢＫＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、広
葉樹半晒クラフトパルプ（ＬＳＢＫＰ）、針葉樹晒サル
ファイトパルプ（ＮＢＳＰ）、広葉樹晒サルファイトパ
ルプ（ＬＢＳＰ）、メカニカルパルプ（ＭＰ）、サ−モ
メカニカルパルプ（ＴＭＰ）その他の木材パルプ等があ
り、これら１種または２種以上のパルプを適宜選択して
用いることができる。また、ポリエステル繊維等の合成
繊維の１種または２種以上を上記の繊維原料中に配合す
ることにより、寸法安定性向上を図ってもよい。As the fiber raw material of the base paper, softwood bleached kraft pulp (NBKP), softwood semi-bleached kraft pulp (N
SBKP), hardwood bleached kraft pulp (LBKP), hardwood semi-bleached kraft pulp (LSBKP), softwood bleached sulfite pulp (NBSP), hardwood bleached sulfite pulp (LBSP), mechanical pulp (MP), sa-momechanical pulp (SBMPP) TMP) and other wood pulps, and one or more types of these pulps can be appropriately selected and used. Further, dimensional stability may be improved by blending one or more synthetic fibers such as polyester fibers into the above fiber raw material.

【００１６】本発明では、難燃紙全重量中に占める無機
質粉体の配合割合は２０重量％以上５０重量％以下とす
る。好ましくは２０重量％以上４０重量％以下である。
更に好ましくは２０重量％以上３５重量％以下である。
無機質粉体含有量が２０重量％未満ではコスト低減効果
が低く、無機質粉体含有量が５０重量％を超えて多く配
合すると、繊維分が少なくなるために、必要とする紙の
強度を得るために例えば高米坪品に限定する、山皮の配
合割合を限定する、あるいは難燃剤として高分子難燃剤
を塗布する等の対策を要する。使用する無機質粉体は通
常用いられている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、タルク、クレ−、酸化チタン等
特に限定されない。In the present invention, the blending ratio of the inorganic powder in the total weight of the flame-retardant paper is 20% by weight or more and 50% by weight or less. It is preferably 20% by weight or more and 40% by weight or less.
It is more preferably 20% by weight or more and 35% by weight or less.
When the content of the inorganic powder is less than 20% by weight, the cost reduction effect is low, and when the content of the inorganic powder is more than 50% by weight, the content of the fiber becomes small, so that the required paper strength is obtained. In addition, for example, it is necessary to take measures such as limiting to high-priced items, limiting the blending ratio of mountain bark, or applying a polymer flame retardant as a flame retardant. The inorganic powder used is not particularly limited, such as aluminum hydroxide, magnesium hydroxide, calcium carbonate, talc, clay, and titanium oxide which are commonly used.

【００１７】本発明で配合する山皮は、難燃紙全重量中
２重量％以上１０重量％以下とする。好ましくは３重量
％以上８重量％以下である。山皮の配合量が２重量％未
満では濾水性が殆ど変化しないので、無機質粉体の配合
割合を２０重量％以上配合することを特徴とする本発明
の難燃紙では良好な地合、ピンホ−ルレベルを達成する
ことが困難となる。山皮を１０重量％を超えて多く配合
しても、燃焼炎の伝達停止機能の向上は横這いとなる
上、山皮の保水性機能による揺変性のため、填料スラリ
−のハンドリング性が悪化する。あるいは抄紙時の濾水
性が大幅に低下する。使用する山皮には、中国産を主と
する長繊維タイプ、スペイン産を主とする短繊維タイプ
があるが、炎の伝達停止機能を重視する場合には長繊維
タイプ、保水性を重視する場合には短繊維タイプを使用
するとよい。The mountain bark blended in the present invention is 2% by weight or more and 10% by weight or less based on the total weight of the flame-retardant paper. It is preferably 3% by weight or more and 8% by weight or less. If the amount of the mountain bark is less than 2% by weight, the drainage is hardly changed. Therefore, the flame-retardant paper of the present invention is characterized in that the content of the inorganic powder is 20% by weight or more. -It will be difficult to achieve the le level. Even if the amount of mountain bark is more than 10% by weight, the improvement function of the combustion flame transmission is stable and the handling property of the filler slurry is deteriorated due to thixotropic property of the mountain bark with water retention function. . Alternatively, the drainage during papermaking is significantly reduced. There are two types of mountain bark used, long-fiber type mainly from China and short-fiber type mainly from Spain, but when the flame transmission stopping function is important, long-fiber type and water retention are important. In this case, the short fiber type should be used.

【００１８】本発明による米坪量１００ｇ／ｍ² 未満の
ビニル壁紙裏打ち用難燃紙は、繊維原料と無機物質の混
合スラリ−に、歩留り助剤やバインダ−を適宜選択して
添加し、通常の湿式抄紙法によって容易に抄造すること
ができる。使用する抄紙機は円網、短網、長網、バ−チ
フォ−マ−、ロトフォ−マ−、ハイドロフォ−マ−など
のいずれでもよく、乾燥機はヤンキ−型、多筒型、スル
−型のいずれでもよい。The flame-retardant paper for vinyl wallpaper lining having a basis weight of less than 100 g / m ² according to the present invention is usually prepared by adding a retention aid or a binder to a mixed slurry of a fiber raw material and an inorganic substance. Paper can be easily made by the wet papermaking method. The paper machine used may be any of a cylinder, a short-mesh, a fourdrinier, a birch-former, a roto-former, a hydro-former, etc., and a dryer is a Yankee type, a multi-cylinder type, a sluice type. Either type can be used.

【００１９】歩留り助剤としては、例えばカチオン性高
分子としては、カチオン化澱粉、カチオン性ポリアクリ
ルアミド、ポリエチレンイミン、ポリアミドポリアミン
エピクロルヒドリン、カチオン変性グア−ガム、カチオ
ン変性ポリビニルアルコ−ル、その他のカチオン性高分
子などがあり、特に限定されない。アニオン性高分子と
しては、ポリアクリルアミド、ポリメタクリルアミド、
酸化澱粉、その他のアニオン性高分子等があり、特に限
定されない。また、原紙強度を保つ目的で接着剤、例え
ば溶解性ビニロン繊維、ラテックスエマルジョン等を用
いてもよい。Examples of the retention aid include cationic polymers such as cationic starch, cationic polyacrylamide, polyethyleneimine, polyamide polyamine epichlorohydrin, cation-modified guar gum, cation-modified polyvinyl alcohol, and other cationic polymers. There are polymers and the like, and there is no particular limitation. As the anionic polymer, polyacrylamide, polymethacrylamide,
There is no particular limitation, such as oxidized starch and other anionic polymers. Further, an adhesive such as soluble vinylon fiber or latex emulsion may be used for the purpose of maintaining the strength of the base paper.

【００２０】本発明のビニル壁紙裏打ち用難燃紙は、ビ
ニル壁紙施工時に糊が原紙の中に浸透してしまわないよ
うにするため、抄紙時に内添および／または外添サイズ
剤を添加することが好ましい。用いるサイズ剤として
は、アルキルケテンダイマ−、スチレンアクリル系、ス
チレンアミド系などの内添および／または外添サイズ剤
を適宜選択して使用することができる。In the flame-retardant paper for backing vinyl wallpaper of the present invention, an internal and / or external sizing agent is added at the time of papermaking in order to prevent the paste from penetrating into the base paper when the vinyl wallpaper is applied. Is preferred. As the sizing agent to be used, an internally and / or externally added sizing agent such as an alkyl ketene dimer, a styrene acrylic type, a styrene amide type can be appropriately selected and used.

【００２１】本発明のビニル壁紙裏打ち用難燃紙は、繊
維と無機質粉体および山皮を混合して湿式抄紙して得ら
れたシ−トに、さらにグアニジン系難燃剤を塗布または
含浸させることにより得られる。グアニジン系難燃剤と
しては例えば、スルファミン酸グアニジン、スルファミ
ン酸グアニジンメチロール化物、リン酸グアニジン、硫
酸グアニジン等を挙げることができる。難燃化処理に際
しては、通常用いられる難燃剤を通常用いられる含浸方
法、例えばサイズプレス機を用いて塗布あるいは含浸す
ればよい。The flame-retardant paper for backing vinyl wallpaper of the present invention comprises a sheet obtained by wet-making paper by mixing fibers, inorganic powder and mountain bark, and further coating or impregnating a guanidine-based flame retardant. Is obtained by Examples of the guanidine flame retardant include guanidine sulfamate, guanidine methyl sulfamate, guanidine phosphate, and guanidine sulfate. In the flame retarding treatment, a commonly used flame retardant may be applied or impregnated using a commonly used impregnation method, for example, a size press machine.

【００２２】[0022]

【実施例】実施例１〜４ 針葉樹晒クラフトパルプ（ＮＢＫＰ）および広葉樹晒ク
ラフトパルプ（ＬＢＫＰ）を１：１に混合したものを離
解後、常法によりフリ−ネス５５０ｍｌまで叩解したパ
ルプスラリ−を作製した。このパルプスラリ−に炭酸カ
ルシウム（「ＴＰ−１２１ＳＤＰ」、短径０．５μｍ×
長径１．５μｍ、奥多摩工業社製）および山皮（「セピ
オレックス５」、短径０．２μｍ×長径５μｍ、龍森社
製）を投入し、十分に混合してパルプ繊維と炭酸カルシ
ウム、山皮の混合スラリ−を作製した。 Examples 1 to 4 Softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP) mixed at a ratio of 1: 1 were disintegrated and then beaten to a freeness of 550 ml by a conventional method to prepare a pulp slurry. did. Calcium carbonate (“TP-121SDP”, short diameter 0.5 μm ×
1.5 μm long diameter, Okutama Kogyo Co., Ltd.) and mountain bark (“Sepio Rex 5”, 0.2 μm minor axis x 5 μm long axis, manufactured by Tatsumori Co., Ltd.) are thoroughly mixed and pulp fiber, calcium carbonate, and mountain bark are added. A mixed slurry of was prepared.

【００２３】この混合物に、更に有機繊維としてポリエ
ステル繊維（直径１０μｍ、繊維長３ｍｍ、クラレ社
製）を全重量当り１％添加し、バインダー繊維として溶
解性ビニロン繊維（１．５ｄ、繊維長３ｍｍ、クラレ社
製）を全重量当り１．０％添加した。上記繊維スラリー
に歩留り助剤としてカチオン性高分子化合物（ポリアミ
ドポリアミンエピクロルヒドリン、「エピノックス」、
ディック・ハーキュレス社製）０．６％、アニオン性高
分子化合物（ポリアクリルアミド、「パーコール１７
３」、アライドコロイド社製）０．０５％をそれぞれ繊
維分全重量に対して添加して紙料を調製し、フリ−ネス
を測定した後、実験室手抄きマシンを用いて坪量約６０
ｇ／ｍ² 、密度０．６ｇ／ｃｍ³ 、難燃剤含浸後で炭酸
カルシウム配合割合が２５％となるシートを作成した。Polyester fiber (diameter 10 μm, fiber length 3 mm, manufactured by Kuraray Co., Ltd.) as an organic fiber was added to this mixture by 1% based on the total weight, and soluble vinylon fiber (1.5 d, fiber length 3 mm, as binder fiber) was added. (Kuraray Co., Ltd.) was added at 1.0% based on the total weight. A cationic polymer compound (polyamide polyamine epichlorohydrin, "Epinox", as a retention aid in the fiber slurry,
Dick Hercules Co., Ltd. 0.6%, anionic polymer compound (polyacrylamide, "Percoll 17
3 ", manufactured by Allied Colloid Co., Ltd.) was added to 0.05% of the total weight of the fiber to prepare a stock, and the freeness was measured, and then the basis weight was measured using a laboratory handmade machine. 60
A sheet having g / m ² , a density of 0.6 g / cm ³ , and a calcium carbonate content of 25% after impregnation with a flame retardant was prepared.

【００２４】このシ−トに難燃剤としてスルファミン酸
グアニジンを有機分に対して２１％および２０％含浸せ
しめた。難燃剤含浸液の組成はポリビニルアルコ−ル
（「ポバ−ル１１７」、クラレ社製）：デンプン（「王
子エ−スＡ」、王子コ−ンスタ−チ社製）：スルファミ
ン酸グアニジン系難燃剤（「ＳＧ−２」、大日本インキ
化学工業社製）：アクリル系サイズ剤（「ハマコ−トＳ
９００Ｇ」、ミサワセラミックケミカル社製）＝６：１
０：８０：４とした。This sheet was impregnated with guanidine sulfamate as a flame retardant at 21% and 20% with respect to the organic content. The composition of the flame retardant impregnating liquid is polyvinyl alcohol ("Poval 117", manufactured by Kuraray Co., Ltd.): starch ("Ojiace A", manufactured by Oji Cornstarch Co., Ltd.): guanidine sulfamate Combustion agent ("SG-2", manufactured by Dainippon Ink and Chemicals, Inc.): Acrylic sizing agent ("Hamacoat S"
900G ", manufactured by Misawa Ceramic Chemical Co., Ltd.) = 6: 1
It was set to 0: 80: 4.

【００２５】上記の方法により、紙全重量中に含まれる
山皮の配合割合が３％、難燃剤を対有機分２１％の難燃
紙（実施例１）と山皮の配合割合が３％、難燃剤を対有
機分２０％含浸せしめた難燃紙（実施例２）、および山
皮の配合割合が８％で難燃剤を対有機分２１％含浸せし
めた難燃紙（実施例３）、山皮の配合割合が８％、難燃
剤を対有機分２０％含浸せしめた難燃紙（実施例４）の
４種類を作製した。By the above-mentioned method, the mixture ratio of the mountain bark contained in the total weight of the paper is 3%, and the mixture ratio of the flame-retardant paper containing the flame retardant to the organic content of 21% (Example 1) and the mountain bark is 3%. , A flame-retardant paper impregnated with a flame retardant to an organic content of 20% (Example 2), and a flame-retardant paper having a mountain bark content of 8% and a flame retardant impregnated with an organic content of 21% (Example 3). Four types of flame-retardant paper (Example 4) impregnated with a flame-retardant agent of 20% and an organic content of 20% were prepared.

【００２６】これらの難燃紙について、ピンホ−ルレベ
ル、地合、防炎性能を評価し、さらに引張強さと引裂強
度の測定値から紙力を評価した。ピンホ−ルレベルはＪ
ＩＳ−Ｌ−１００４に示される綿織物試験方法の通気性
試験に準じて測定した。通気性が低いものはピンホ−ル
が少なく、通気性が高いものはピンホ−ルが多いと判断
し、通気性が５ｃｃ／ｃｍ² ／秒以下と低いものを○、
通気性が５ｃｃ／ｃｍ² ／秒を超えて高いものを×とし
た。地合は目視にて確認し、良好なものを○、不良なも
のを×で記した。防炎性能はＪＩＳ−Ｚ−２１５０に示
される薄い材料の防炎性試験方法（４５゜メッケルバ−
ナ−法）に準じて測定し、規定の防炎性能に合格したも
の○、規定の防炎性能に不合格であったものを×で記載
した。紙力についてはＪＩＳ−Ｐ−８１１３に示される
紙及び板紙の引張強さ試験方法およびＪＩＳ−Ｐ−８１
１６に示される紙及び板紙の引裂強度試験方法に準じて
測定し、裂断長が１．７ｋｍ以上でかつ引裂強度が３５
ｇｆ以上のものを○、裂断長が１．７ｋｍ以上でも引裂
強度が３５ｇｆ未満のものあるいは引裂強度が３５ｇｆ
以上でも裂断長が１．７ｋｍ未満のものは×で記載し
た。結果を表１に示す。With respect to these flame-retardant papers, the pinhole level, formation and flameproof performance were evaluated, and the paper strength was evaluated from the measured values of tensile strength and tear strength. Pinhole level is J
It measured according to the breathability test of the cotton fabric test method shown by IS-L-1004. Those with low air permeability have few pinholes, those with high air permeability are judged to have many pinholes, and those with low air permeability of 5 cc / cm ² / sec or less
The case where the air permeability was higher than 5 cc / cm ² / sec was marked with x. The formation was visually confirmed, and good ones were marked with ◯ and bad ones with x. Flameproof performance is shown in JIS-Z-2150. Flameproofness test method for thin materials (45 ° Meckel bar
Measurements in accordance with the (Naor method), and those that passed the specified flameproof performance were marked with ◯, and those that failed the specified flameproof performance were marked with x. Regarding the paper strength, the tensile strength test method for paper and paperboard described in JIS-P-8113 and JIS-P-81
The tear strength was measured according to the tear strength test method for paper and paperboard shown in 16, and the tear length was 1.7 km or more and the tear strength was 35.
Gf or more is ◯, tear strength is less than 35 gf or tear strength is 35 gf even if the breaking length is 1.7 km or more.
Even above, those having a breaking length of less than 1.7 km are indicated by x. The results are shown in Table 1.

【００２７】実施例５ 紙全重量当たりの炭酸カルシウムの配合割合を３５％に
調整した以外は実施例１と同様の方法で難燃紙を作成し
た。この難燃紙のピンホールレベル、地合、防炎性能、
紙力を評価した結果を表１に示す。 Example 5 A flame-retardant paper was prepared in the same manner as in Example 1 except that the proportion of calcium carbonate was adjusted to 35% based on the total weight of the paper. The pinhole level, formation, flameproof performance of this flame retardant paper,
The results of evaluation of paper strength are shown in Table 1.

【００２８】実施例６ 紙全重量当たりの炭酸カルシウムの配合割合を３５％に
調整し、難燃剤の配合割合を有機分に対して２０％に調
整した以外は実施例１と同様の方法で難燃紙を作成し
た。この難燃紙のピンホールレベル、地合、防炎性能、
紙力を評価した結果を表１に示す。 Example 6 Difficult by the same method as in Example 1 except that the proportion of calcium carbonate was adjusted to 35% and the proportion of flame retardant was adjusted to 20% of the organic content based on the total weight of the paper. I made a burning paper. The pinhole level, formation, flameproof performance of this flame retardant paper,
The results of evaluation of paper strength are shown in Table 1.

【００２９】実施例７ 紙全重量当たりの炭酸カルシウムの配合割合を３５％、
山皮の配合割合を８％に調整した以外は実施例１と同様
の方法で難燃紙を作成した。この難燃紙のピンホールレ
ベル、地合、防炎性能、紙力を評価した結果を表１に示
す。 Example 7 The blending ratio of calcium carbonate to the total weight of paper is 35%,
A flame-retardant paper was prepared in the same manner as in Example 1 except that the content ratio of the mountain bark was adjusted to 8%. Table 1 shows the results of evaluating the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００３０】実施例８ 紙全重量当たりの炭酸カルシウムの配合割合を３５％、
山皮の配合割合を８％に調整し、難燃剤の配合割合を有
機分に対して２０％に調整した以外は実施例１と同様の
方法で難燃紙を作成した。この難燃紙のピンホールレベ
ル、地合、防炎性能、紙力を評価した結果を表１に示
す。 Example 8 The mixing ratio of calcium carbonate to the total weight of paper is 35%,
A flame-retardant paper was prepared in the same manner as in Example 1 except that the content ratio of the mountain bark was adjusted to 8% and the content ratio of the flame retardant was adjusted to 20% with respect to the organic content. Table 1 shows the results of evaluating the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００３１】実施例９ 紙全重量当たりの炭酸カルシウムの配合割合を４０％に
調整した以外は実施例１と同様の方法で難燃紙を作成し
た。この難燃紙のピンホールレベル、地合、防炎性能、
紙力を評価した結果を表１に示す。 Example 9 A flame-retardant paper was prepared in the same manner as in Example 1 except that the proportion of calcium carbonate was adjusted to 40% based on the total weight of the paper. The pinhole level, formation, flameproof performance of this flame retardant paper,
The results of evaluation of paper strength are shown in Table 1.

【００３２】実施例１０ 紙全重量当たりの炭酸カルシウムの配合割合を４０％に
調整し、難燃剤の配合割合を有機分に対して２０％に調
整した以外は実施例１と同様の方法で難燃紙を作成し
た。この難燃紙のピンホールレベル、地合、防炎性能、
紙力を評価した結果を表１に示す。 Example 10 Difficulty in the same manner as in Example 1 except that the blending ratio of calcium carbonate based on the total weight of paper was adjusted to 40% and the blending ratio of the flame retardant was adjusted to 20% with respect to the organic content. I made a burning paper. The pinhole level, formation, flameproof performance of this flame retardant paper,
The results of evaluation of paper strength are shown in Table 1.

【００３３】比較例１ 紙全重量当たりの炭酸カルシウムの配合割合を従来技術
における難燃紙のレベルの１０％にし、山皮の配合割合
を０％に調整した以外は実施例１と同様の方法で難燃紙
を作成した。この難燃紙のピンホールレベル、地合、防
炎性能、紙力を評価した。その結果を表２に示す。 Comparative Example 1 The same method as in Example 1 except that the blending ratio of calcium carbonate based on the total weight of the paper was set to 10% of the level of the flame-retardant paper in the prior art and the blending ratio of mountain bark was adjusted to 0%. I made a flame retardant paper. The pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper were evaluated. The results are shown in Table 2.

【００３４】比較例２ 紙全重量当たりの炭酸カルシウムの配合割合を１０％、
山皮の含有量を０％に調整し、難燃剤の配合割合を有機
分に対して２０％に調整した以外は実施例１と同様の方
法で難燃紙を作成した。この難燃紙のピンホールレベ
ル、地合、防炎性能、紙力を評価した結果を表２に示
す。 Comparative Example 2 The blending ratio of calcium carbonate to the total weight of paper is 10%,
A flame-retardant paper was prepared in the same manner as in Example 1 except that the content of the mountain bark was adjusted to 0% and the blending ratio of the flame retardant was adjusted to 20% with respect to the organic content. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００３５】比較例３ 紙全重量当たりの山皮の配合割合を１％に調整した以外
は実施例１と同様の方法で難燃紙を作成した。この難燃
紙のピンホールレベル、地合、防炎性能、紙力を評価し
た結果を表２に示す。 Comparative Example 3 A flame-retardant paper was prepared in the same manner as in Example 1 except that the compounding ratio of mountain bark was adjusted to 1% based on the total weight of the paper. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００３６】比較例４ 紙全重量当たりの山皮の配合割合を１％に調整し、難燃
剤の配合割合を有機分に対して２０％に調整した以外は
実施例１と同様の方法で難燃紙を作成した。この難燃紙
のピンホールレベル、地合、防炎性能、紙力を評価した
結果を表２に示す。 Comparative Example 4 Difficult by the same method as in Example 1 except that the compounding ratio of the mountain bark based on the total weight of the paper was adjusted to 1% and the compounding ratio of the flame retardant was adjusted to 20% with respect to the organic content. I made a burning paper. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００３７】比較例５ 紙全重量当たりの炭酸カルシウムの配合割合を４０％、
山皮の配合割合を０％にした以外は実施例１と同様の方
法で難燃紙を作成した。この難燃紙のピンホールレベ
ル、地合、防炎性能、紙力を評価した結果を表２に示
す。 Comparative Example 5 The proportion of calcium carbonate was 40% based on the total weight of paper.
A flame-retardant paper was prepared in the same manner as in Example 1 except that the mountain bark content was 0%. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００３８】比較例６ 紙全重量当たりの炭酸カルシウムの配合割合を４０％、
山皮の配合割合を０％に調整し、難燃剤の配合割合を有
機分に対して２０％に調整した以外は実施例１と同様の
方法で難燃紙を作成した。この難燃紙のピンホールレベ
ル、地合、防炎性能、紙力を評価した結果を表２に示
す。 Comparative Example 6 The proportion of calcium carbonate was 40% based on the total weight of paper.
A flame-retardant paper was prepared in the same manner as in Example 1 except that the content ratio of the mountain bark was adjusted to 0% and the content ratio of the flame retardant was adjusted to 20% with respect to the organic content. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００３９】比較例７ 紙全重量当たりに配合する繊維状無機物質として山皮の
替わりにガラス繊維を３％に調整した以外は実施例１と
同様の方法で難燃紙を作成した。この難燃紙のピンホー
ルレベル、地合、防炎性能、紙力を評価した結果を表２
に示す。 Comparative Example 7 A flame-retardant paper was prepared in the same manner as in Example 1 except that the glass fiber was adjusted to 3% instead of the mountain bark as the fibrous inorganic substance added to the total weight of the paper. Table 2 shows the results of evaluating the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.
Shown in

【００４０】比較例８ 紙全重量当たりに配合する繊維状無機物質として山皮の
替わりにガラス繊維を３％に調整し、難燃剤の配合割合
を有機分に対して２０％に調整した以外は実施例１と同
様の方法で難燃紙を作成した。この難燃紙のピンホール
レベル、地合、防炎性能、紙力を評価した結果を表２に
示す。 Comparative Example 8 Except that the glass fiber was adjusted to 3% instead of the mountain bark as the fibrous inorganic substance to be added to the total weight of the paper, and the mixing ratio of the flame retardant was adjusted to 20% based on the organic content. A flame-retardant paper was prepared in the same manner as in Example 1. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００４１】比較例９ パルプの叩解フリ−ネスを従来用いられている５００ｍ
ｌに設定し、紙全重量当たり山皮を０％に調整した以外
は実施例１と同様の方法で難燃紙を作成した。この難燃
紙のピンホールレベル、地合、防炎性能、紙力を評価し
た結果を表２に示す。 Comparative Example 9 The beating freeness of pulp was 500 m, which is conventionally used.
A flame-retardant paper was prepared in the same manner as in Example 1 except that the amount was set to 1 and the mountain bark was adjusted to 0% based on the total weight of the paper. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００４２】比較例１０ 紙全重量当たりの炭酸カルシウムの配合割合を５５％に
調整した以外は実施例１と同様の方法で難燃紙を作成し
た。この難燃紙のピンホールレベル、地合、防炎性能、
紙力を評価した結果を表２に示す。 Comparative Example 10 A flame-retardant paper was prepared in the same manner as in Example 1 except that the proportion of calcium carbonate was adjusted to 55% based on the total weight of the paper. The pinhole level, formation, flameproof performance of this flame retardant paper,
The results of evaluation of paper strength are shown in Table 2.

【００４３】比較例１１ 紙全重量当たりの山皮の配合割合を１２％に調整した以
外は実施例１と同様の方法で難燃紙を作成した。この難
燃紙のピンホールレベル、地合、防炎性能、紙力を評価
した結果を表２に示す。 Comparative Example 11 A flame-retardant paper was prepared in the same manner as in Example 1 except that the compounding ratio of mountain bark based on the total weight of the paper was adjusted to 12%. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

【００４４】 。[0044] .

【００４５】 。[0045] .

【００４６】表１からわかるように、実施例１〜１０に
みられる如く、難燃剤配合率が従来技術レベルである対
有機分２１％であっても、無機物質配合率が高いため紙
中の難燃剤含有率は１２．５％以下のレベルに留まる。
それでも防炎性は３級合格を達成でき、山皮の配合率を
高めれば２級も合格する。As can be seen from Table 1, even if the flame retardant blending ratio is 21% with respect to the organic content, which is the level of the prior art, as shown in Examples 1 to 10, the inorganic substance blending ratio is high, so that Flame retardant content remains at levels below 12.5%.
Even so, the flameproofness can pass the 3rd grade, and if the compounding ratio of the mountain bark is increased, the 2nd grade will also pass.

【００４７】一方、比較例１、２にみられる如く、従来
技術レベルの無機物質配合率では防炎性を発現するため
に要する難燃剤配合率は対紙１５．６％以上であるの
で、ビニル壁紙裏打ち用難燃紙に要求される防炎３級以
上に合格するために要する難燃剤量は、実施例１〜１０
に示すものと比較して２割以上多く配合する必要が生じ
る。On the other hand, as can be seen in Comparative Examples 1 and 2, the blend ratio of the flame retardant required to exhibit flameproof property is 15.6% or more with respect to the paper at the blend ratio of the inorganic material of the conventional level. The flame retardant amount required for passing the flameproof class 3 or higher required for the flame-retardant paper for wallpaper lining is Examples 1 to 10.
It is necessary to add more than 20% more than that shown in (1).

【００４８】比較例３、４では無機質粉体配合量を適性
範囲に設定し、山皮を１％配合しているが、比較例１、
２に示す従来レベルのものよりは無機質粉体配合量が高
いので難燃剤配合量を低減することができるも、この山
皮配合レベルでは顕著な防炎性向上効果が認められな
い。In Comparative Examples 3 and 4, the compounding amount of the inorganic powder is set within an appropriate range and 1% of mountain bark is compounded.
Since the amount of the inorganic powder blended is higher than that of the conventional level shown in No. 2, the blending amount of the flame retardant can be reduced, but at this mountain bark blending level, a remarkable flameproofing improving effect is not recognized.

【００４９】比較例５、６の様に無機分配合率を高く設
定しても、山皮を配合していないものは、濾水性が高く
なり、ピンホ−ルレベル、地合レベルの悪化を招く。Even if the inorganic content ratio is set high as in Comparative Examples 5 and 6, those without mountain bark have high drainage, resulting in deterioration of the pinhole level and formation level.

【００５０】比較例７、８では山皮の代わりにガラス繊
維を併用しているが、ガラス繊維併用にて防炎性向上効
果は認められるも、濾水性が改善されないためピンホ−
ルレベル、地合レベルが悪い。In Comparative Examples 7 and 8, glass fibers were used in combination in place of the mountain bark, but the combined use of glass fibers showed an effect of improving the flameproof property, but the drainage was not improved, so that the pinhole was used.
Le level and formation level are bad.

【００５１】比較例９の様に、無機質粉体の配合量を適
正量にして、山皮を配合せずに保水性をもたせるべくパ
ルプ繊維を従来と同レベルの叩解フリ−ネスに設定した
場合は、ピンホ−ルおよび地合レベルは良好なものとな
るが、紙力が低下し実用的でない。As in Comparative Example 9, when the amount of the inorganic powder is set to an appropriate amount and the pulp fiber is set to the beating freeness of the same level as that of the conventional one in order to have the water retention property without adding the mountain bark. Has a good pinhole and formation level, but it is not practical because the paper strength decreases.

【００５２】比較例１０のように無機質粉体の配合量を
適性範囲を超えて多くすると、山皮を併用してもピンホ
ールおよび地合の改善効果が低く、また紙力が低過ぎて
壁紙加工困難となり実用的でない。When the blending amount of the inorganic powder exceeds the suitable range as in Comparative Example 10, the effect of improving pinholes and formation is low even when the mountain bark is used in combination, and the paper strength is too low. It becomes difficult to process and is not practical.

【００５３】比較例１１のように山皮を適性範囲を超え
て配合した場合には、ピンホールおよび地合レベルが向
上し、難燃剤配合量の更なる低減が可能となるが、山皮
の保水性効果のため抄紙時のハンドリング性が悪化す
る。When mountain bark is blended over the appropriate range as in Comparative Example 11, the pinhole and formation level are improved, and the flame retardant compounding amount can be further reduced. Due to the water-retaining effect, the handling property during papermaking deteriorates.

【００５４】[0054]

【発明の効果】以上説明したところからわかるように本
発明によれば、繊維と無機物質からなるシ−トにグアニ
ジン系難燃剤を塗布または含浸せしめることにより難燃
性を付与した米坪量１００ｇ／ｍ² 未満のビニル壁紙裏
打ち用難燃紙において、該無機物質として無機質粉体を
２０重量％以上５０重量％以下、山皮を２重量％以上１
０重量％以下含有することにより、ピンホ−ルが少なく
地合も良好な上に、少量の難燃剤量で防炎効果のあるビ
ニル壁紙裏打ち用難燃紙を提供することが出来る。As described above, according to the present invention, a sheet made of fibers and an inorganic substance is coated with or impregnated with a guanidine flame retardant to give flame retardancy. In a flame-retardant paper for backing vinyl wallpaper having a weight ratio of less than 1 / m ² , inorganic powder is 20% by weight or more and 50% by weight or less and mountain bark is 2% by weight or more and 1 as the inorganic substance.
By containing 0% by weight or less, it is possible to provide a flame-retardant paper for backing vinyl wallpaper which has a small amount of pinholes, has a good texture, and has a small amount of a flame retardant and has a flameproof effect.

フロントページの続き (72)発明者 吉田 美奈 東京都江東区東雲１丁目10番６号 新王子 製紙株式会社東京商品研究所内 (72)発明者 椛山 佳明 東京都江東区東雲１丁目10番６号 新王子 製紙株式会社東京商品研究所内 (72)発明者 山地 安之 東京都西多摩郡日の出町平井字欠下２番１ 号 日鉄鉱業株式会社内 (72)発明者 吉田 健彦 東京都西多摩郡日の出町平井字欠下２番１ 号 日鉄鉱業株式会社内Front Page Continuation (72) Inventor Mina Yoshida 1-10-6 Shinonome, Koto-ku, Tokyo Shin-Oji Paper Co., Ltd. Tokyo Commodity Research Institute (72) Inventor Yoshiaki Kabayama 1-10-6 Shinonome, Koto-ku, Tokyo Shin-Oji Paper Co., Ltd., Tokyo Commodity Research Institute (72) Inventor Yasuyuki Yamaji No. 2 Hirai, Hirai-cho, Nishitama-gun, Tokyo Inside Nippon Steel Mining Co., Ltd. (72) Takehiko Yoshida Hirai, Hinode-cho, Nishitama-gun, Tokyo No. 2 in the letter missing Nittetsu Mining Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 繊維と無機物質からなるシ−トにグアニ
ジン系難燃剤を塗布または含浸せしめることにより難燃
性を付与した米坪量１００ｇ／ｍ² 未満のビニル壁紙裏
打ち用難燃紙において、該無機物質として、（１）無機
質粉体を難燃紙全重量当り２０重量％以上５０重量％以
下、および（２）山皮を難燃紙全重量当り２重量％以上
１０重量％以下、含有することを特徴とするビニル壁紙
裏打ち用難燃紙。1. A flame-retardant paper for backing vinyl wallpaper having a rice basis weight of less than 100 g / m ² , which is flame-retarded by coating or impregnating a sheet made of fibers and an inorganic substance with a guanidine-based flame retardant, As the inorganic substance, (1) an inorganic powder is contained in an amount of 20% by weight or more and 50% by weight or less based on the total weight of the flame-retardant paper, and (2) a mountain bark is contained in an amount of 2% by weight or more and 10% by weight or less based on the total weight of the flame-retardant paper. Flame-retardant paper for backing vinyl wallpaper, characterized in that