JP2022153750A - 保温防水紙 - Google Patents
保温防水紙 Download PDFInfo
- Publication number
- JP2022153750A JP2022153750A JP2021056432A JP2021056432A JP2022153750A JP 2022153750 A JP2022153750 A JP 2022153750A JP 2021056432 A JP2021056432 A JP 2021056432A JP 2021056432 A JP2021056432 A JP 2021056432A JP 2022153750 A JP2022153750 A JP 2022153750A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- paper
- waterproof
- retaining
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Abstract
Description
(1)紙基材に、スチレン系樹脂、アクリル系樹脂、ポリオレフィン系樹脂の少なくとも1種類の合成樹脂を含み、かつ、中空粒子、熱膨張性マイクロカプセルの少なくとも1種類を含む塗工層を設けた、保温防水紙。
(2)前記塗工層の塗工量が4g/m2以上である、(1)に記載の保温防水紙。
(3)前記保温防水紙のコッブ吸水度が、120秒で3g/m2以下であるか、30分で25g/m2以下である、(1)もしくは(2)に記載の保温防水紙。
(4)前記熱膨張性マイクロカプセルが熱可塑性樹脂の外殻を持ち、内部に膨張剤である低沸点炭化水素を内包している、(1)~(3)のいずれかに記載の保温防水紙。
(5)前記熱膨張性マイクロカプセルの膨張温度が60℃以上120℃以下であることを特徴とする、(1)~(4)のいずれかに記載の保温防水紙。
(6)前記中空粒子の外殻部に無機元素を含む、(1)~(5)のいずれかに記載の保温防水紙。
(7)前記中空粒子の内部が真空状態であることを特徴とする、(1)~(6)のいずれかに記載の保温防水紙。
(8)前記紙基材が多層抄き板紙である、(1)~(7)のいずれかに記載の保温防水紙。
(9)スチレン系樹脂、アクリル系樹脂、ポリオレフィン系樹脂の少なくとも1種類の合成樹脂を含む防水剤と、中空粒子、熱膨張性マイクロカプセルの少なくとも1種類を含む保温剤を混合した塗工液を塗工後、乾燥することを特徴とする、保温防水紙の製造方法。
本発明に係る保温防水紙は、紙基材と、紙基材の少なくとも一方の面に設けられた保温防水塗工層と、を少なくとも有している。本発明において紙基材の坪量は特に制限されず、例えば、10~800g/m2とすることができる。紙基材が単層紙である場合、坪量は10~300g/m2の範囲で適宜設定することができ、例えば、紙基材がクラフト紙の場合、坪量を30~250g/m2の範囲で設定することができる。また、紙基材が2層以上の紙層を有する多層抄き板紙である場合、その坪量は70~800g/m2の範囲で適宜設定することができ、例えば、段ボールのライナの場合、坪量を80~600g/m2の範囲で設定することができる。
本発明に係る保温防水紙は、紙基材上に設けられた保温防水塗工層を有していることを特徴としており、本発明において保温防水塗工層は、保温材、合成樹脂およびワックスを含有する。このことにより、従来技術に比べて簡素な構成で保温性と防水性を両立させた機能を紙基材に対して容易に付与することができる。
[紙基材の準備]
針葉樹未晒クラフトパルプ(NUKP)を63質量%、古紙パルプを37質量%の割合で使用し、3層抄きで坪量280g/m2となるようライナ用の板紙を抄造して紙基材とした(紙基材サンプル)。
セラミック製真空バルーン粒子(有限会社東亜システムクリエイト製 Heatcut Powder、融点1800℃)と、スチレン系樹脂およびアクリル系樹脂とパラフィンを含む炭化水素系ワックスが混合分散された防水剤(マイケルマン社製 VAPORCOAT2200.S)を固形分重量比で1:9の割合で混合し、塗工液を調製した。調製した塗工液を、メイヤーバーを用いて塗工量が10g/m2となるよう紙基材に塗工後、送風乾燥機で105℃、1分間乾燥させて、保温防水紙を得た(サンプル2)。
熱膨張性マイクロカプセル(松本油脂製薬株式会社製 F-35D、)と、スチレン系樹脂およびアクリル系樹脂とパラフィンを含む炭化水素系ワックスが混合分散された防水剤(マイケルマン社製 VAPORCOAT2200.S)を固形分重量比で1:9の割合で混合し、塗工液を調製した。調製した塗工液を、メイヤーバーを用いて塗工量が10g/m2となるよう紙基材に塗工後、送風乾燥機で140℃、3分間乾燥させて、保温防水紙を得た(サンプル3)。
熱膨張性マイクロカプセル(松本油脂製薬株式会社製 F-48D)と、スチレン系樹脂およびアクリル系樹脂とパラフィンを含む炭化水素系ワックスが混合分散された防水剤(マイケルマン社製 VAPORCOAT2200.S)を固形分重量比で1:9の割合で混合し、塗工液を調製した。調製した塗工液を、メイヤーバーを用いて塗工量が10g/m2となるよう紙基材に塗工後、送風乾燥機で160℃、3分間乾燥させて、保温防水紙を得た(サンプル4)。
熱膨張性マイクロカプセル(松本油脂製薬株式会社製 F-78D)と、スチレン系樹脂およびアクリル系樹脂とパラフィンを含む炭化水素系ワックスが混合分散された防水剤(マイケルマン社製 VAPORCOAT2200.S)を固形分重量比で1:9の割合で混合し、塗工液を調製した。調製した塗工液を、メイヤーバーを用いて塗工量が10g/m2となるよう紙基材に塗工後、送風乾燥機で180℃、3分間乾燥させて、保温防水紙を得た(サンプル5)。
中空粒子(松本油脂製薬株式会社製 MFL-100MCA、膨張温度:105℃)と、ポリビニルアルコールを含む塗工液(クラレ社製、PVA117)を固形分重量比で1:9の割合で混合し、塗工液を調製した。調製した塗工液を、メイヤーバーを用いて塗工量が10g/m2となるよう紙基材に塗工後、送風乾燥機で105℃、1分間乾燥させて、保温段ボール原紙を得た(サンプル6)。
スチレン系樹脂およびアクリル系樹脂とパラフィンを含む炭化水素系ワックスが混合分散された防水剤(マイケルマン社製 VAPORCOAT2200.S)を、メイヤーバーを用いて塗工量が10g/m2となるよう紙基材に塗工後、送風乾燥機で105℃、1分間乾燥させて、防水紙を得た(サンプル7)。
得られた各サンプルに対して以下の試験を行い、評価した。
(1)コッブ吸水度
JIS P 8140に準拠し、コッブ法により測定を行った。すなわち、100mlの蒸留水を塗工層に接触させ、規定時間後に吸収された水の単位面積あたりの重量を測定した。なお、測定時間は、通常の規定時間である120秒(2分間)に加え、30分でも測定を行った。
サンプルを50mm×50mmに切断後、8枚重ねたうえでグラファイト紙で挟んだ測定試料を準備した。熱流束計の下部ヒーター上に熱流束測定センサ、測定試料の順に載せた後、上部ヒーターを下降させプレスし、試料表面が30℃となるよう下部ヒーターを18℃、上部ヒーターを42℃に設定し測定した熱抵抗値を用い、試料の熱伝導率を以下の式により求めた:
熱伝導率(W/mK) = 試料厚さ(m)/ 熱抵抗値(m2・K/W)
作製したサンプルについて、25℃、50%RH環境下に3時間静置した後、縦200mm×横150mmに裁断し、厚さ5mmのAフルート段ボールに重ね、図1に示すように型枠にはめ込んだ後、上面に温度計を設けた発泡スチロール製の蓋に、試料が箱の内部に向けられるようはめ込んだ。発泡スチロール製容器に、塊状のかち割り氷2kgを入れた後、試料をはめ込んだ蓋にて封をし、23℃、湿度50%の環境下にて10分おきに箱内部の気温を測定した。(図2参照。)
評価結果を表1に示す。
Claims (9)
- 紙基材に、スチレン系樹脂、アクリル系樹脂、ポリオレフィン系樹脂の少なくとも1種類の合成樹脂を含み、かつ、中空粒子、熱膨張性マイクロカプセルの少なくとも1種類を含む塗工層を設けた、保温防水紙。
- 前記塗工層の塗工量が4g/m2以上である、請求項1に記載の保温防水紙。
- 前記保温防水紙のコッブ吸水度が、120秒で3g/m2以下であるか、30分で25g/m2以下である、請求項1もしくは2に記載の保温防水紙。
- 前記熱膨張性マイクロカプセルが熱可塑性樹脂の外殻を持ち、内部に膨張剤である低沸点炭化水素を内包している、請求項1~3のいずれかに記載の保温防水紙。
- 前記熱膨張性マイクロカプセルの膨張温度が60℃以上120℃以下であることを特徴とする、請求項1~4のいずれかに記載の保温防水紙。
- 前記中空粒子の外殻部に無機元素を含む、請求項1~5のいずれかに記載の保温防水紙。
- 前記中空粒子の内部が真空状態であることを特徴とする、請求項1~6のいずれかに記載の保温防水紙。
- 前記紙基材が多層抄き板紙である、請求項1~7のいずれかに記載の保温防水紙。
- スチレン系樹脂、アクリル系樹脂、ポリオレフィン系樹脂の少なくとも1種類の合成樹脂を含む防水剤と、中空粒子、熱膨張性マイクロカプセルの少なくとも1種類を含む保温剤を混合した塗工液を塗工後、乾燥することを特徴とする、保温防水紙の製造方法。
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