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JP3868060B2 - Waterproof construction method using photo-curable prepreg sheet - Google Patents
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JP3868060B2 - Waterproof construction method using photo-curable prepreg sheet - Google Patents

Waterproof construction method using photo-curable prepreg sheet Download PDF

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Publication number
JP3868060B2
JP3868060B2 JP14960997A JP14960997A JP3868060B2 JP 3868060 B2 JP3868060 B2 JP 3868060B2 JP 14960997 A JP14960997 A JP 14960997A JP 14960997 A JP14960997 A JP 14960997A JP 3868060 B2 JP3868060 B2 JP 3868060B2
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prepreg sheet
sheet
waterproof
prepreg
strip
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JP14960997A
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JPH10339001A (en
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秀己 伊藤
隆章 小原
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Asahi Kasei Chemicals Corp
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Asahi Kasei Chemicals Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、建造物の屋上又は床等の被防水下地の防水施工方法に関する。
【0002】
【従来の技術】
従来、建造物の屋上や床等の被防水下地の防水には、アスファルト防水塗装や塩化ビニルシート等の張り付けが行われていたが、従来のアスファルト防水塗装や塩化ビニルシート等の張り付けの場合には機械的強度が低く、劣化が激しいために短期間で防水効果が損なわれ、頻繁なメンテナンス作業を強いられるという問題があった。
【0003】
一方、不飽和ポリエステル樹脂を、施工現場においてガラス繊維チョップドストランドマットに含浸して硬化成形することにより、被防水下地の表面に防水層を形成する工法も知られているが、この工法では優れた機械的強度を発揮できるものの、被防水下地に含まれる水分が、施工後温度上昇によって水蒸気と化して膨張し、防水層を押し上げ防水層に膨れを生じさせる問題があった。また、同工法は施工現場において樹脂を硬化させるため、不飽和ポリエステル樹脂等の中のスチレンモノマー等揮発性物質が揮散することによる作業環境悪化の問題があった。
【0004】
上記施工方法の問題点を解決すべく、柔軟なガラス繊維強化樹脂成形シートを用いた防水の施工方法が特開平9−11376号公報に開示されているが、この施工方法ではシート同士の接着をエポキシ系や不飽和ポリエステル系等の樹脂接着剤により固着するか、あるいはシート間の目地を不飽和ポリエステル樹脂を含浸したガラス繊維で被覆硬化成形する必要があり、施工作業が繁雑となる欠点があった。
【0005】
【発明が解決しようとする課題】
本発明の目的は、上記のような従来の防水の施工方法の諸問題を解決して、被防水下地の水分に関係なく施工ができ、被防水下地の状態に影響されにくく、機械強度、耐候性に優れ、かつ作業現場での施工性を簡便にし、作業現場におけるスチレンモノマーの揮散を抑制することができる防水の施工方法を提供することにある。
【0006】
【課題を解決するための手段】
すなわち、本発明は、光硬化性のプリプレグシートを用いる建造物の防水の施工方法であって、建造物の被防水下地に帯板を固定し、上記プリプレグシートの側縁が上記帯板上に位置するようにしてプリプレグシートで被防水下地と帯板とを被覆して、圧着により仮接着し、次いで、自然光または光照射によってプリプレグシートを硬化させ、プリプレグシートを帯板に完全接着させることを特徴とする光硬化性のプリプレグシートを用いた防水の施工方法、である。
【0007】
本発明に用いる帯板とは、機械強度、耐候性に優れた帯状の板をいい、材質は特に限定されないが、金属や繊維強化プラスチック等が好ましい。金属としては、錆びないものなら何でもよく、例えば、ステンレス板、アルミ板、亜鉛鋼板、プライマー処理を行った塩ビ鋼板、防錆処理を行った金属板等が挙げられ、繊維強化プラスチックとしては、プライマー処理を行った不飽和ポリエステル樹脂含浸のガラス繊維強化プラスチック、プライマー処理を行ったビニルエステル樹脂含浸のガラス繊維強化プラスチック等が挙げられる。帯板は、厚み0.1〜10mmが好ましく、さらに好ましくは0.5〜5mmであり、また、幅1〜100cmが好ましく、さらに好ましくは2〜20cmである。
【0008】
本発明でプリプレグシートに使用される繊維は、有機及び/又は無機繊維であり、例えば、ガラス繊維、炭素繊維、アラミド繊維、アクリル繊維、ポリエステル繊維等が挙げられるが、価格や性能のバランスからガラス繊維が好ましい。プリプレグシートは、形状についてはマット状や織物など特に限定されない。本発明で使用する光硬化性樹脂組成物は、樹脂と光硬化重合開始剤およびスチレンモノマー等のビニルモノマーとからなるものであり、必要に応じて充てん材や増粘剤、低収縮剤、難燃剤等が混合されていてもよい。本発明で使用する光硬化性樹脂組成物の樹脂は、例えば、特開平8−323860号公報に開示されたような、不飽和ポリエステル、ビニルエステルが挙げられる。
【0009】
具体的に、不飽和ポリエステルとしては、活性不飽和結合を有しているジカルボン酸単独、又は活性不飽和結合を有していないジカルボン酸と併用したジカルボン酸を酸を成分とし、多価アルコールをアルコール成分として得られるものてある。例えば、活性不飽和結合を有していないジカルボン酸としては、無水フタル酸、イソフタル酸、テレフタル酸、テトラヒドロフタル酸、アジピン酸、セバチン酸等が挙げられる。
【0010】
活性不飽和結合を有してなるジカルボン酸としては、フマル酸、マレイン酸、無水マレイン酸、イタコン酸等の活性不飽和結合を有しているジカルボン酸を成分とし、エチレングリコール、プロピレングリコール、ジエチレングリコール、ジプロピレングリコール、1,2−ブタンジオール、1,3−ブタンジオール、1,5−ペンタンジオール、1,6−ヘキサンジオール、2−メチル−1,3−プロパンジオール、2,2−ジメチル−1,3−プロパンジオール、シクロヘキサン−1,4−ジメチタノール、ビスフェノールAのエチレンオキサイド付加物、ビスフェノールAのプロピレンオキサイド付加物等の多価アルコールが挙げられる。
【0011】
一方、具体的に、ビニルエステルとしては、エポキシ樹脂とアクリル酸またはメタクリル酸を成分として得られるエポキシ(メタ)アクリレート、あるいは飽和ジカルボン酸及び/又は不飽和ジカルボン酸と多価アルコールから得られる末端カルボキシル基のポリエステルにα、β−不飽和カルボンエステル基を含有するエポキシ化合物を反応させて得られるポリエステル(メタ)アクリレート等が挙げられる。エポキシ樹脂としては、ビスフェノールAジグリシジルエーテル及びその高分子量同族体、ノボラック型ポリグリシジルエーテル類等が挙げられる。飽和ジカルボン酸としては、活性不飽和基を有していないジカルボン酸、例えばフタル酸、イソフタル酸、テレフタル酸、テトラヒドロフタル酸、アジピン酸、セバチン酸等が挙げられる。
【0012】
不飽和ジカルボン酸としては、活性不飽和基を有しているジカルボン酸、例えば、フマル酸、マレイン酸、無水マレイン酸、イタコン酸等が挙げられる。多価アルコールとしては、例えばエチレングリコール、プロピレングリコール、ジエチレングリコール、ジプロピレングリコール、1,2−ブタンジオール、1,3−ブタンジオール、1,5−ペンタンジオール、1,6−ヘキサンジオール、2−メチル−1,3−プロパンジオール、2,2−ジメチル−1,3−プロパンジオール、シクロヘキサン−1,4−ジメチタノール、ビスフェノールAのエチレンオキサイド付加物、ビスフェノールAのプロピレンオキサイド付加物等が挙げられる。α、β−不飽和カルボン酸エステル基を含有するエポキシ化合物としては、グリシジルメタクリレートが代表例として挙げられる。
【0013】
光硬化性樹脂組成物に含まれる光硬化重合開始剤としては、200nm〜1200nmの波長で活性な組成物であれば何ら制限されないが、紫外線、可視光及び近赤外光の各領域で活性な重合開始剤の組み合わせたものが好ましい。紫外線重合開始剤の代表的なものとしてベンゾフェノンまたは2,2−ジメトキシ−2−フェニルアセトフェノン等が挙げられ、可視光重合開始剤の代表的なものとしてベンジル、トリメチルベンゾイルジフェニルフォスフィンオキシド等が挙げられる。また、近赤外光重合開始剤の代表的なものとしては、例えば、1,1,5,5−テトラキス(p−ジメチルアミノフェニル)−2,4−ペンタジエニル・トリフエニルn−ブチルボレート等の特開平8−323860号公報に開示されている化合物が挙げられる。
【0014】
紫外線重合開始剤を単独で含む樹脂組成物の場合、紫外線が短波長光であるため、繊維や充填材等の影響を受け、繊維や充填材の陰となる部分は重合を開始しないため、繊維や充填材の種類や添加量、シート厚さ等に制限があった。また、自然光では、季節、天候、場所、時間等によって光の強さおよび構成する波長の比率が変わるが、紫外線重合開始剤、可視光重合開始剤および近赤外光重合開始剤を組み合わせたものを含む樹脂組成物は、各単独の重合開始剤を含む樹脂組成物よりも、自然条件の影響を受けにくく、自然光でプリプレグシートを安定的に硬化させることができる。なお、光硬化性樹脂組成物に使用される充填剤としては、何ら制限がなく、例えば、炭酸カルシウム、タルク、クレー、ガラス粉、水酸化アウルミニウム、硫酸バリウム、酸化チタン等の公知のものが使用できる。
【0015】
光硬化性樹脂組成物に使用される増粘剤としては、何ら制限がなく、例えば、酸化マグネシウム、水酸化マグネシウム、酸化カルシウム、水酸化カルシウム等のアルカリ土類金属化合物、アルミニウムアルコラートのような有機金属化合物、トルイレンジイソシアナート、キシリレンジイソシアナート、ヘキサメチレンジイソシアナート、ジフェニルメタンジイソシアナート等のイソシアナート類等の公知のものが使用できる。低収縮剤としては、ポリスチレン、ポリ酢酸ビニル、ポリメチルメタクリレート等の熱可塑性樹脂を挙げることができる。また、難燃剤としては、塩素化パラフィン、ヘキサブロムベンゼン等のハロゲン化合物と三酸化アンチモン、リン化合物の併用や、水酸化アルミニウム、水酸化マグネシウム等の無機水和物等が挙げられる。
【0016】
本発明に用いるプリプレグシートは、一般的なSMC(シートモールディングコンパウンド)の製造方法で製造できる。光硬化性樹脂組成物をポリエチレンやポリアミド等のフィルム上に塗布した後、ガラス繊維チョップドストランドマットやガラス繊維織物のような繊維強化材をその上に乗せ、圧着含浸させてシート状にし、次いで、増粘熟成の程度を調整することにより、施工性に適した極めて柔軟性に富んだプリプレグシートを得ることができる。
【0017】
本発明の防水の施工方法は、帯板を、まず被防水下地の周囲に固定し、次に複数の帯板をプリプレグシート拡布方向に互いに平行に、例えばプリプレグシート幅で、被防水下地に固定し、次いで該帯板に沿ってロール状のプリプレグシートを拡布する。その際、隣り合ったプリプレグシートの側縁が、帯板上に位置するように、予め帯板の固定間隔をプリプレグシート幅に合わせるなど決めておく必要がある。さらに、プリプレグシートと帯板との接着強度等の必要に応じて、これら固定した帯板の間にも、更に別の帯板を1本もしくは数本固定することもできる。固定する帯板の少なくとも被防水下地の周囲に固定する帯板は、建造物の躯体に固定することが好ましい。
【0018】
プリプレグシートは、ロール状で暗所に保管しておき、施工時に被防水下地に固定された帯板に沿って拡布を行い、適切な長さに切断して被防水下地及び該帯板を被覆し、帯板に仮接着させる。次いで、帯板とプリプレグシートの重ね合わせ部に光を照射することにより、プリプレグシートを硬化させ、帯板と完全接着させる。本発明に用いるプリプレグシートは、金属との接着性に優れており、帯板が金属の場合、帯板とプリプレグシートとの接着に接着剤を必要としないが、帯板とプリプレグシートとの接着を強固にするため、予め該帯板表面をアセトン等で洗浄することが好ましい。また、帯板が塩ビ鋼板または繊維強化プラスチックの場合、プリプレグシートを帯板に接着するために、帯板は予めプライマー処理をしておくことが好ましい。
【0019】
また、本発明で使用するプリプレグシートは、プリプレグシート同士の接着性に優れており、プリプレグシート同士の接着に接着剤を使用する必要がない。本発明の光硬化性のプリプレグシートを用いた防水の施工方法は、広い場所などを施工する場合、隣り合うプリプレグシートの側縁は重ねても重ねなくてもよい。隣り合うプリプレグシートの側縁を重ねる場合、プリプレグシート間の接着方法は、重ね合わせ部を仮接着し、次いで該重ね合わせ部に光を照射することにより硬化させ、プリプレグシート同士を完全接着させる。重ね合わせ代は、0.5〜10cmが好ましく、さらに好ましくは3〜7cmである。隣り合うプリプレグシートの側縁を重ねない場合、必要に応じて、プリプレグシート間の目地部を別のプリプレグシートで重ね、仮接着し、次いで光照射により該プリプレグシートを硬化させることで目地処理をすることもできる。
【0020】
仮接着とは、プリプレグシートと帯板、またはプリプレグシート同士を重ね合わせ、または重ね合わせ部をローラー等で圧着させた状態で、重ね合わせ部を手ではがすことが可能な状態をいう。完全接着とは、仮接着したプリプレグシートと帯板、またはプリプレグシート同士の重ね合わせ部に、光を照射させることにより、重ね合わせ部を硬化接着させた、手で剥がすことが不可能な状態をいう。本発明で、プリプレグシートに含浸した光硬化性樹脂の硬化は、自然光で充分であるが、必要に応じて照明用ランプ、ハロゲンランプ、白熱灯、赤外線ランプ、紫外線ランプ等を使用し、硬化接着時間を短縮することもできる。
【0021】
本発明で用いるプリプレグシートは、極めて柔軟性に優れており、被防水下地の平面部分は勿論、複雑な表面形状部分にも良く屈曲適応してその表面を被覆することができる。さらに、プリプレグシートと帯板の接着、プリプレグシート同士の接着に接着剤の使用は必要なく、現場におけるシートの接着固定作業が極めて簡単になる。また、プリプレグシートは帯板に接着されており、直接被防水下地とは接着していないため、被防水下地の状態に影響されにくくなる。
【0022】
【発明の実施の形態】
以下、本発明を実施例により、具体的に説明する。なお、下記の方法で評価した。
(1)防水層の状態
建造物に震度5相当の揺れを与えた後の防水層の状態を調べた。
(2)施工工数(作業員数)
準備作業を含め、要した実作業員の数で評価した。
【0023】
〔実施例1〕
ベンゾフェノンとトリメチルベンゾイルジフェニルフォスフィンオキシドおよび1,1,5,5−テトラキス(p−シメチルアミノフェニル)−2,4−ペンタジエニル・トリフェニルn−ブチルボレートの組み合わせからなる光重合開始剤と、不飽和ポリエステル樹脂とを含む光硬化性樹脂組成物をガラス繊維チョプドストランドマットに含浸させてなる、厚さ2mm、幅1m、長尺の光硬化性のプリプレグシートを製造し、ロール状の巻姿で暗部に保管しておいた。軽量気泡コンクリート(ALC)(旭化成工業(株)製、ヘーベルTM)を使用した陸屋根をもつ戸建住宅の屋上200m2の周囲に厚さ1.0mm、幅10cmの亜鉛鋼板を釘で固定し、次いで、該亜鉛鋼板幅の中心が屋上の片方の端から1mに位置するように亜鉛鋼板を屋上の端と平行に固定した。次に、亜鉛鋼板幅の中心間が1mになるように、次の亜鉛鋼板をすでに固定されている亜鉛鋼板と平行に固定した。同様の操作を、屋上の反対側の端まで繰り返した。
【0024】
その後、保管しておいたロール状のプリプレグシートを、固定した亜鉛鋼板上にプリプレグシートの側縁が沿うように拡布しながら、被防水下地の端の一部を被覆し、屋上の端でカッターを用いて切断した。次いで、平行に固定してある亜鉛鋼板上に、ロール状のプリプレグシートの側縁が上記の被覆したプリプレグシートの側縁に沿って密着させるようにして、拡布し、屋上の端でプリプレグシートを切断した。同様の操作を繰り返しながら、被防水下地全体の被覆を行った。その後、亜鉛鋼板とプリプレグシートの重ね合わせ部にローラーがけを行い、そのまま10時間以上放置して、被覆したプリプレグシート全体を自然光で硬化させ、プリプレグシートを亜鉛鋼板に完全接着させた。
【0025】
〔比較例1〕
軽量気泡コンクリート(ALC)(旭化成工業(株)製、ヘーベルTM)を使用した陸屋根をもつ戸建住宅の屋上200m2全面にイソシアネート系のプライマー処理を行った後、実施例1で使用した光硬化性のプリプレグシートを拡布しながら、被防水下地の端の一部を被覆し、屋上の端でカッターを用いて切断した。次いで、ロール状のプリプレグシートの側縁を上記の被覆したプリプレグシートの側縁に沿って平行になるように、固定した亜鉛鋼板上に拡布し、屋上の端でプリプレグシートを切断した。同様の操作を繰り返しながら、被防水下地全体の被覆を行った。その後、亜鉛鋼板とプリプレグシートの重ね合わせ部にローラーがけを行い、そのまま10時間以上放置して、被覆したプリプレグシート全体を自然光で硬化させた。
【0026】
〔比較例2〕
軽量気泡コンクリート(ALC)(旭化成工業(株)製、ヘーベルTM)を使用した陸屋根をもつ戸建住宅の20×10mの屋上200m2にウレタン系接着剤を100mm間隔で筋状に塗り付けて被防水下地とした後、不飽和ポリエステル樹脂からなる厚さ2mm、幅1m、長さ10mの柔軟なガラス繊維シート1枚を屋上の10m長の辺に沿って拡布しながら、被防水下地の端を被覆した。次いで、上記の被覆を行ったガラス繊維シートの側縁に沿って他のガラス繊維シートを被覆し、同様の操作を繰り返しながら、ガラス繊維シートを被防水下地全体に被覆した。次いで、隣り合うガラス繊維シート間目地部にガラス繊維チョップドストランドマットを敷いた後、不飽和ポリエステル樹脂を含浸させて硬化接合することにより、目地処理を行った。
【0027】
【表1】

Figure 0003868060
【0028】
【発明の効果】
本発明の防水の施工方法は、光硬化性のプリプレグシートを帯板に接着し、直接、被防水下地に接着しないため、被防水下地の状態に影響されにくい。特に、被防水下地が、膨張収縮や地震等による衝撃で生じる歪みが大きいコンクリートや目地部が複雑かつ大きな動きをする軽量気泡コンクリート(ALC)の場合、影響されにくい。さらに、帯板とプリプレグシートとの接着およびプリプレグシート同士の接着に接着剤を使用する必要がなく、作業現場におけるスチレンモノマーの揮散を抑制することができ、現場においてプリプレグシートの接着固定作業を極めて簡単にすることができ、作業能率を著しく向上させることができる。また、極めて柔軟性に優れているプリプレグシートを用いるので、被防水下地の平面部分は勿論、複雑な表面形状部分にも良く屈曲適応してその表面を被覆することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waterproof construction method for a waterproof base such as a rooftop or a floor of a building.
[0002]
[Prior art]
Conventionally, waterproofing of waterproofing foundations such as rooftops and floors of buildings has been done with asphalt waterproofing paint or vinyl chloride sheet, but in the case of pasting asphalt waterproofing paint or vinyl chloride sheet etc. Has a problem that its mechanical strength is low and its deterioration is severe, so that the waterproof effect is lost in a short period of time and frequent maintenance work is forced.
[0003]
On the other hand, a method of forming a waterproof layer on the surface of the waterproof substrate is also known by impregnating the unsaturated polyester resin into a glass fiber chopped strand mat at the construction site, and performing molding, but this method is excellent. Although the mechanical strength can be exhibited, there is a problem in that the moisture contained in the waterproof substrate is converted into water vapor by the temperature rise after the construction and expands to raise the waterproof layer and cause the waterproof layer to swell. In addition, since the method hardens the resin at the construction site, there is a problem of deterioration of the working environment due to the volatilization of volatile substances such as styrene monomer in the unsaturated polyester resin.
[0004]
In order to solve the problems of the above construction method, a waterproof construction method using a flexible glass fiber reinforced resin molded sheet is disclosed in Japanese Patent Application Laid-Open No. 9-11376. It is necessary to fix it with a resin adhesive such as epoxy or unsaturated polyester, or to coat and mold the joint between the sheets with glass fiber impregnated with unsaturated polyester resin, which makes the construction work complicated. It was.
[0005]
[Problems to be solved by the invention]
The object of the present invention is to solve the problems of the conventional waterproofing construction method as described above, and can be constructed regardless of the moisture of the waterproof base, hardly affected by the state of the waterproof base, mechanical strength, weather resistance An object of the present invention is to provide a waterproof construction method that is excellent in performance, simplifies the workability at the work site, and can suppress the volatilization of styrene monomer at the work site.
[0006]
[Means for Solving the Problems]
That is, the present invention is a waterproofing construction method for a building using a photocurable prepreg sheet, wherein a band plate is fixed to a waterproof base of the building, and the side edge of the prepreg sheet is on the band plate. Cover the waterproof base and the strip with the prepreg sheet so that they are positioned, temporarily bond by pressure bonding , then cure the prepreg sheet by natural light or light irradiation, and completely bond the prepreg sheet to the strip A waterproof construction method using a photocurable prepreg sheet.
[0007]
The strip used in the present invention is a strip-shaped plate excellent in mechanical strength and weather resistance, and the material is not particularly limited, but metal, fiber reinforced plastic and the like are preferable. The metal may be anything as long as it does not rust, such as stainless steel plate, aluminum plate, galvanized steel plate, PVC steel plate with primer treatment, metal plate with rust prevention treatment, etc. Examples thereof include a glass fiber reinforced plastic impregnated with an unsaturated polyester resin that has been treated, and a glass fiber reinforced plastic impregnated with a vinyl ester resin that has been subjected to a primer treatment. The band plate preferably has a thickness of 0.1 to 10 mm, more preferably 0.5 to 5 mm, and a width of 1 to 100 cm, more preferably 2 to 20 cm.
[0008]
The fiber used for the prepreg sheet in the present invention is an organic and / or inorganic fiber, and examples thereof include glass fiber, carbon fiber, aramid fiber, acrylic fiber, and polyester fiber. Fiber is preferred. The shape of the prepreg sheet is not particularly limited, such as a mat shape or a woven fabric. The photocurable resin composition used in the present invention is composed of a resin, a photocuring polymerization initiator, and a vinyl monomer such as a styrene monomer, and if necessary, a filler, a thickener, a low shrinkage agent, a difficult agent. A flame retardant etc. may be mixed. Examples of the resin of the photocurable resin composition used in the present invention include unsaturated polyesters and vinyl esters as disclosed in JP-A-8-323860.
[0009]
Specifically, as the unsaturated polyester, a dicarboxylic acid having an active unsaturated bond alone or a dicarboxylic acid used in combination with a dicarboxylic acid not having an active unsaturated bond as an ingredient, a polyhydric alcohol is used. It is obtained as an alcohol component. For example, examples of the dicarboxylic acid having no active unsaturated bond include phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, adipic acid, and sebacic acid.
[0010]
The dicarboxylic acids have the active unsaturated bond ing, fumaric acid, maleic acid, and maleic anhydride, a dicarboxylic acid component having an active unsaturated bond such as itaconic acid, ethylene glycol, propylene glycol, Diethylene glycol, dipropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2-methyl-1,3-propanediol, 2,2-dimethyl Examples include polyhydric alcohols such as -1,3-propanediol, cyclohexane-1,4-dimethanol, ethylene oxide adduct of bisphenol A, and propylene oxide adduct of bisphenol A.
[0011]
On the other hand, specifically, the vinyl ester includes an epoxy (meth) acrylate obtained by using an epoxy resin and acrylic acid or methacrylic acid as components, or a terminal carboxyl obtained from a saturated dicarboxylic acid and / or an unsaturated dicarboxylic acid and a polyhydric alcohol. Examples thereof include polyester (meth) acrylate obtained by reacting an epoxy compound containing an α, β-unsaturated carboxylic ester group with a base polyester. Examples of the epoxy resin include bisphenol A diglycidyl ether and high molecular weight homologues thereof, novolak type polyglycidyl ethers, and the like. Examples of the saturated dicarboxylic acid include dicarboxylic acids having no active unsaturated group, such as phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, adipic acid, and sebacic acid.
[0012]
Examples of the unsaturated dicarboxylic acid include dicarboxylic acids having an active unsaturated group, such as fumaric acid, maleic acid, maleic anhydride, and itaconic acid. Examples of the polyhydric alcohol include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, and 2-methyl. -1,3-propanediol, 2,2-dimethyl-1,3-propanediol, cyclohexane-1,4-dimethanol, ethylene oxide adduct of bisphenol A, propylene oxide adduct of bisphenol A, and the like. A typical example of the epoxy compound containing an α, β-unsaturated carboxylic acid ester group is glycidyl methacrylate.
[0013]
The photocurable polymerization initiator contained in the photocurable resin composition is not limited as long as it is a composition that is active at a wavelength of 200 nm to 1200 nm, but is active in each region of ultraviolet light, visible light, and near infrared light. A combination of polymerization initiators is preferred. Typical examples of ultraviolet polymerization initiators include benzophenone or 2,2-dimethoxy-2-phenylacetophenone, and representative examples of visible light polymerization initiators include benzyl and trimethylbenzoyldiphenylphosphine oxide. . In addition, typical examples of the near-infrared photoinitiator include, for example, 1,1,5,5-tetrakis (p-dimethylaminophenyl) -2,4-pentadienyl, triphenyl n-butylborate and the like. Examples thereof include compounds disclosed in Kaihei 8-323860.
[0014]
In the case of a resin composition containing an ultraviolet polymerization initiator alone, since ultraviolet rays are short-wavelength light, it is affected by fibers and fillers, and the portion behind the fibers and fillers does not start polymerization. There were restrictions on the type and amount of filler, the thickness of the sheet, and the like. In natural light, the intensity of light and the ratio of constituent wavelengths change depending on the season, weather, place, time, etc., but a combination of an ultraviolet polymerization initiator, a visible light polymerization initiator and a near infrared photopolymerization initiator. The resin composition containing is less susceptible to natural conditions than the resin composition containing each single polymerization initiator, and can stably cure the prepreg sheet with natural light. The filler used in the photocurable resin composition is not limited at all, and examples thereof include known ones such as calcium carbonate, talc, clay, glass powder, aurium hydroxide, barium sulfate, and titanium oxide. Can be used.
[0015]
The thickener used in the photocurable resin composition is not particularly limited, and examples thereof include alkaline earth metal compounds such as magnesium oxide, magnesium hydroxide, calcium oxide and calcium hydroxide, and organic materials such as aluminum alcoholate. Known compounds such as metal compounds, isocyanates such as toluylene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate and diphenylmethane diisocyanate can be used. Examples of the low shrinkage agent include thermoplastic resins such as polystyrene, polyvinyl acetate, and polymethyl methacrylate. Examples of the flame retardant include a combined use of halogen compounds such as chlorinated paraffin and hexabromobenzene, antimony trioxide, and phosphorus compounds, and inorganic hydrates such as aluminum hydroxide and magnesium hydroxide.
[0016]
The prepreg sheet used in the present invention can be manufactured by a general SMC (sheet molding compound) manufacturing method. After the photocurable resin composition is applied onto a film such as polyethylene or polyamide, a fiber reinforcing material such as a glass fiber chopped strand mat or glass fiber fabric is placed thereon, and is crimped and impregnated into a sheet, By adjusting the degree of thickening and aging, a highly flexible prepreg sheet suitable for workability can be obtained.
[0017]
In the waterproof construction method of the present invention, the band plate is first fixed around the waterproof base, and then the plurality of band plates are fixed to the waterproof base in parallel with each other in the prepreg sheet spreading direction, for example, with a prepreg sheet width. Then, a roll-shaped prepreg sheet is spread along the strip. At that time, it is necessary to determine in advance, for example, that the fixing interval of the band plates is adjusted to the width of the prepreg sheet so that the side edges of the adjacent prepreg sheets are positioned on the band plate. Furthermore, one or several other strips can be fixed between the fixed strips as required, such as the adhesive strength between the prepreg sheet and the strip. It is preferable that the band plate to be fixed at least around the waterproof base of the band plate to be fixed is fixed to the building frame.
[0018]
The prepreg sheet is stored in a dark place in the form of a roll, spreads along the strip fixed to the waterproof base during construction, and cuts to an appropriate length to cover the waterproof base and the strip And temporarily bonded to the strip. Next, the prepreg sheet is cured by irradiating light to the overlapping portion of the band plate and the prepreg sheet, and completely adhered to the band plate. The prepreg sheet used in the present invention is excellent in adhesion to metal, and when the band plate is metal, no adhesive is required for bonding the band plate to the prepreg sheet, but the bonding between the band plate and the prepreg sheet is not necessary. In order to strengthen the strength, it is preferable to previously wash the surface of the strip with acetone or the like. Further, when the band plate is a PVC steel plate or fiber reinforced plastic, it is preferable that the band plate is preliminarily treated in advance in order to bond the prepreg sheet to the band plate.
[0019]
In addition, the prepreg sheet used in the present invention is excellent in adhesiveness between prepreg sheets, and it is not necessary to use an adhesive for adhesion between prepreg sheets. In the waterproof construction method using the photocurable prepreg sheet of the present invention, the side edges of adjacent prepreg sheets may or may not overlap when a wide place is constructed. When the side edges of adjacent prepreg sheets are overlapped, the bonding method between the prepreg sheets is to temporarily bond the overlapping portions and then to cure by irradiating the overlapping portions with light, thereby completely bonding the prepreg sheets. The overlap allowance is preferably 0.5 to 10 cm, and more preferably 3 to 7 cm. If the side edges of adjacent prepreg sheets are not stacked, if necessary, the joint between the prepreg sheets is overlapped with another prepreg sheet, temporarily bonded, and then the prepreg sheet is cured by light irradiation for joint treatment. You can also
[0020]
Temporary adhesion refers to a state in which the overlapped portion can be peeled by hand in a state where the prepreg sheet and the band plate, or the prepreg sheets are overlapped, or the overlapped portion is pressure-bonded with a roller or the like. Complete adhesion refers to a state in which the overlapped part is cured and adhered by irradiating light to the temporarily bonded prepreg sheet and strip, or the overlapped part of the prepreg sheets, and cannot be peeled off by hand. Say. In the present invention, natural light is sufficient for curing the photocurable resin impregnated in the prepreg sheet, but if necessary, use an illumination lamp, a halogen lamp, an incandescent lamp, an infrared lamp, an ultraviolet lamp, etc. Time can also be shortened.
[0021]
The prepreg sheet used in the present invention is extremely flexible, and can be flexibly adapted to cover the surface of a complex surface shape portion as well as a flat surface portion of a waterproof base. Further, it is not necessary to use an adhesive for bonding the prepreg sheet and the band plate, and bonding the prepreg sheets, and the work of fixing the sheet in the field becomes extremely simple. Further, since the prepreg sheet is bonded to the band plate and is not directly bonded to the waterproof base, it is not easily affected by the state of the waterproof base.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described by way of examples. In addition, the following method evaluated.
(1) State of waterproof layer The state of the waterproof layer after the building was shaken with a seismic intensity of 5 was examined.
(2) Construction man-hours (number of workers)
The number of actual workers required including preparatory work was evaluated.
[0023]
[Example 1]
A photoinitiator comprising a combination of benzophenone and trimethylbenzoyldiphenylphosphine oxide and 1,1,5,5-tetrakis (p-cymethylaminophenyl) -2,4-pentadienyl-triphenyl n-butylborate; A photocurable resin composition containing a saturated polyester resin is impregnated into a glass fiber chopped strand mat to produce a photocurable prepreg sheet having a thickness of 2 mm, a width of 1 m, and a roll shape. Stored in the dark. A galvanized steel sheet having a thickness of 1.0 mm and a width of 10 cm is fixed with a nail around a rooftop 200 m 2 of a detached house having a flat roof using lightweight cellular concrete (ALC) (manufactured by Asahi Kasei Kogyo Co., Ltd., Hebel TM). Next, the galvanized steel plate was fixed in parallel with the rooftop end so that the center of the galvanized steel plate width was located 1 m from one end of the rooftop. Next, the next galvanized steel plate was fixed in parallel with the already fixed galvanized steel plate so that the distance between the centers of the galvanized steel plates was 1 m. The same operation was repeated to the opposite end of the roof.
[0024]
Then, while spreading the stored roll-shaped prepreg sheet on the fixed galvanized steel sheet so that the side edge of the prepreg sheet is along, cover a part of the edge of the waterproof base, and cut it with the roof edge. It cut | disconnected using. Next, on the galvanized steel plate fixed in parallel, the side edges of the roll-shaped prepreg sheet are closely adhered along the side edges of the coated prepreg sheet, and the prepreg sheet is spread at the end of the rooftop. Disconnected. The entire waterproof substrate was coated while repeating the same operation. Thereafter, the overlapping part of the galvanized steel sheet and the prepreg sheet was roller-rolled and left as it was for 10 hours or more, and the entire coated prepreg sheet was cured with natural light, thereby completely bonding the prepreg sheet to the galvanized steel sheet.
[0025]
[Comparative Example 1]
Photocuring used in Example 1 after performing isocyanate-based primer treatment on the entire 200m 2 rooftop of a detached house with a flat roof using lightweight cellular concrete (ALC) (manufactured by Asahi Kasei Kogyo Co., Ltd., Hebel TM) While spreading the prepreg sheet, a part of the edge of the waterproof base was covered, and the roof edge was cut with a cutter. Subsequently, the roll-shaped prepreg sheet was spread on the fixed galvanized steel sheet so that the side edges thereof were parallel along the side edges of the coated prepreg sheet, and the prepreg sheet was cut at the end of the roof. The entire waterproof substrate was coated while repeating the same operation. Thereafter, the overlapped portion of the galvanized steel sheet and the prepreg sheet was rollered and left as it was for 10 hours or longer to cure the entire coated prepreg sheet with natural light.
[0026]
[Comparative Example 2]
Lightweight concrete (ALC) (Asahi Chemical Industry Co., Ltd., Hebel TM) and smeared a urethane adhesive to the rooftop 200 meters 2 of 20 × 10 m in detached houses with flat roof using streaked at 100mm intervals to be After making the waterproof base, the end of the waterproof base is spread while spreading a flexible glass fiber sheet made of unsaturated polyester resin with a thickness of 2 mm, a width of 1 m, and a length of 10 m along the 10 m long side of the roof. Covered. Next, another glass fiber sheet was coated along the side edge of the glass fiber sheet subjected to the above coating, and the glass substrate was coated on the entire waterproof substrate while repeating the same operation. Subsequently, after laying a glass fiber chopped strand mat on the joint between adjacent glass fiber sheets, joint treatment was performed by impregnating with an unsaturated polyester resin and curing and joining.
[0027]
[Table 1]
Figure 0003868060
[0028]
【The invention's effect】
The waterproof construction method of the present invention adheres a photocurable prepreg sheet to a band plate and does not directly adhere to a waterproof base, so that it is not easily affected by the state of the waterproof base. In particular, when the waterproof substrate is a concrete having a large distortion caused by an expansion / shrinkage or an impact caused by an earthquake or the like, or a lightweight cellular concrete (ALC) in which a joint part moves in a complicated and large manner, it is hardly affected. Furthermore, there is no need to use an adhesive for bonding the strip and the prepreg sheet, and the prepreg sheets can be bonded to each other. It can be simplified and work efficiency can be remarkably improved. Further, since the prepreg sheet having excellent flexibility is used, the surface can be covered by being flexibly adapted not only to the flat surface portion of the waterproof base but also to the complicated surface shape portion.

Claims (1)

光硬化性のプリプレグシートを用いる建造物の防水の施工方法であって、建造物の被防水下地に帯板を固定し、上記プリプレグシートの側縁が上記帯板上に位置するようにしてプリプレグシートで被防水下地と帯板とを被覆して、圧着により仮接着し、次いで、自然光または光照射によってプリプレグシートを硬化させ、プリプレグシートを帯板に完全接着させることを特徴とする光硬化性のプリプレグシートを用いた防水の施工方法。A method of waterproofing a building using a photo-curable prepreg sheet, wherein the strip is fixed to a waterproof base of the building, and the side edge of the prepreg sheet is positioned on the strip. Photocurability characterized by covering a waterproof substrate and strip with a sheet, temporarily bonding by pressure bonding , then curing the prepreg sheet by natural light or light irradiation, and completely bonding the prepreg sheet to the strip Waterproof construction method using prepreg sheet.
JP14960997A 1997-06-06 1997-06-06 Waterproof construction method using photo-curable prepreg sheet Expired - Fee Related JP3868060B2 (en)

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