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JP4583539B2 - Moisture permeable waterproof fabric and method for producing the same - Google Patents
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JP4583539B2 - Moisture permeable waterproof fabric and method for producing the same - Google Patents

Moisture permeable waterproof fabric and method for producing the same Download PDF

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Publication number
JP4583539B2
JP4583539B2 JP2000053656A JP2000053656A JP4583539B2 JP 4583539 B2 JP4583539 B2 JP 4583539B2 JP 2000053656 A JP2000053656 A JP 2000053656A JP 2000053656 A JP2000053656 A JP 2000053656A JP 4583539 B2 JP4583539 B2 JP 4583539B2
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Japan
Prior art keywords
moisture
moisture absorption
resin
fabric
fine particles
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JP2000053656A
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JP2001240753A (en
Inventor
晃 西本
雄一郎 表
克機 高橋
良祐 西田
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Japan Exlan Co Ltd
Toyobo Co Ltd
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Japan Exlan Co Ltd
Toyobo Co Ltd
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  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は雨衣、登山、アスレチック、スキー、スノーボード、ゴルフ等のスポーツ衣料、紳士、婦人服、コート類等のカジュアルウェア及び各種外衣、冷凍庫、冷蔵庫などで作業するユニホーム等各種衣料用として用いられる吸湿発熱、衣服内湿度低減、結露防止効果を持ち、さらに高湿度下での衣服内湿度低減効果に優れた透湿防水布帛に関するものである。
【0002】
【従来の技術】
保温性が要求される繊維製品には冬季に使用する一般衣料(スーツ、コート等)、防寒衣料(ジャンパー等)、またスキーなどの冬季スポーツ衣料ならびに冷凍庫、冷蔵庫などで作業するユニフォーム等があり、保温性向上のために繊維集合体の繊維径を細くしてデッドエア層を増やすことや、繊維にセラミックスや金属を練り込み遠赤外線の効果を期待する方法などが種々提案されている。
保温性を向上させる方法としては、例えば繊維にセラミックスや金属を練り込む方法としては、特開昭63−105107号公報の繊維製品の製造方法や特開平7−331584号公報の防ダニ用遠赤外線放射繊維等のように繊維に遠赤外線を放射するセラミックス及び金属を練り込む方法が提案されている。しかしながら、これらの方法はセラミックス及び金属を練り込むことにより原糸の強力が低下したり、原糸が着色したりする欠点がある。
コーティング剤やラミネート樹脂の中にセラミックスや金属を添加する方法としては、特開昭60−162641号公報の保温効果の優れたシート状素材や特開昭63−35887号公報のコーティング布帛、特開平1−183579号公報のセラミックスをコーティングした布または紙製品などが開示されている。しかし、これらの方法では保温性は得られるが添加剤の吸放湿性に由来する
衣服内湿度低減、結露防止効果は得られていなかった。
一方、透湿防水衣料の着用時の蒸れを防止し、結露防止性を高める方法としては、特開昭56−17256号公報、特開昭56−20679号公報の防水シート、特開昭60−52675号公報の吸放湿性防水シート、特開昭60−110440号公報、特開昭60−126386号公報の非通気性吸放湿性防水シート、特開昭1−77530号公報の結露防止性防水シート、特開平7−9631号公報の透湿性防水布帛、特開平3―97970号公報の吸放湿性防水コーティング布帛等が開示されている。
しかし、これらは結露防止性を狙ったものであり、結露防止性と発熱効果の両者を兼ね備えることを狙ったものではなかった。
また、従来の透湿防水布帛は衣服内の蒸気圧と外気の蒸気圧差を利用して透湿させるものであるため、外気が高湿度であると透湿能力が落ちるため、着用者は発汗時に蒸れを感じ不快であるという欠点があった。
【0003】
【発明が解決しようとする課題】
そこで、以前に本発明者らは、高吸放湿吸湿発熱性の微粒子を繊維布帛に対し透湿性樹脂を接着剤として付着させることによって、人体から放出される汗を吸湿して発熱し、併せて高い吸放湿性により衣服内湿度低減、結露防止効果を持つ透湿防水布帛を得る方法により本問題の解決を図り、吸湿発熱性、衣服内湿度低減効果、透湿性を得ることができた。
しかしながら、吸湿発熱、衣服内湿度低減効果を持つ樹脂層を布帛に付与するコーティング法において、基布(繊維布帛)上に樹脂組成物をコーティング後、水中に浸漬して樹脂を凝固させ、溶媒を水中に抽出し、乾燥する方法を用いた際には、本高吸放湿吸湿性発熱有機微粒子の影響により形成された樹脂層と基布の間の剥離強力が弱い欠点が明らかになり、改善の必要が生じた。
本発明は、高湿度下で着用しても発汗時に蒸れ感がなく、更には、樹脂層と基布の間の剥離強力を改善した透湿防水布帛を提供しようとするものである。
【0004】
【課題を解決するための手段】
すなわち、本発明は次の構成より成るものである。
1.繊維布帛の少なくとも片面に、高吸放湿吸湿発熱性有機微粒子を含有する樹脂組成物層を有する透湿防水布帛であって、
高吸放湿吸湿発熱性有機微粒子が、ニトリル基を有するビニルモノマーが50重量%以上よりなる高ニトリル系重合体にヒドラジン処理により架橋構造を導入し、残存しているニトリル基の1.0mmol/g以上を加水分解により塩型カルボキシル基に化学変換せしめたものであるか又は/及びポリスチレン系、ポリアクリロニトリル系、ポリアクリルエステル系、ポリメタアクリルエステル系のいずれかの重合体にスルホン酸基、カルボン酸基、リン酸基あるいはそれらの塩が導入され、架橋性ビニル化合物で架橋されたものであり、
樹脂組成物層がベース樹脂中に架橋剤としてブロックイソシアネートを使用することにより得られたものであり、
前記ベース樹脂がウレタン樹脂を60%以上含む樹脂であり、
初期衣服内湿度低減値(△I)が3%以上であることを特徴とする透湿防水布帛。
【0006】
【発明の実施の形態】
以下、本発明の実施の形態について詳細に説明する。
本発明に用いる繊維布帛(基布)としては、ポリエステル系、ポリアミド系、ポリアクリロニトリル系等の合成繊維、レーヨン、アセテート等の半合成繊維、木綿、シルク、ウール等の天然繊維からなる、織物、編物、不織布などが含まれる。また上記の基布に他の後加工、例えば撥水加工等を施しておいても良い。
【0007】
本発明における樹脂層を形成するベース樹脂は、公知のウレタン系樹脂で微多孔質膜を形成できる樹脂であるが、この樹脂には他の樹脂、例えばシリコン樹脂、ポリエステル樹脂、ポリアミド樹脂等、またはこれらの樹脂の混合物等で、非水系溶媒の樹脂を40重量%以下の割合で含んでいても良い。また本樹脂層中には、他の添加剤、例えば酸化チタン、シリカ等が添加されていても良い。
【0008】
本発明における高吸放湿吸湿発熱性有機微粒子としては、吸湿性が高く、かつ放湿性を有し、なおかつ吸湿した際に発熱を示す有機微粒子であり、相対湿度(RH)65%での水分率(吸湿率)が25%以上の高吸湿性であり、初期吸湿速度が0.6%/分以上、好ましくは、0.8%/分以上の高吸湿速度であることが優れた吸湿発熱性を得るために必要である。水分率は好ましくは、30%以上、より好ましくは40%以上であり、初期吸湿速度は好ましくは0.6%/分以上、より好ましくは0.8%/分以上、更に好ましくは1.0%/分以上の有機微粒子である。
また放湿性に関しては20℃、90%RHから20℃、40%RHでの初期放湿速度が0.8%/分以上であることが吸収した水分の放散による衣服内湿度低減、結露防止の観点より好ましく、さらに好ましくは1.0%/分以上である。
なお、初期吸湿速度とは、70℃×12時間の真空乾燥後、20℃×65%RHの雰囲気中に10分間放置した時の吸湿率を求め、1分間当たりの吸湿率の増加率によって求められるものであり、初期放湿速度とは20℃、90%RHでの24時間調湿後、20℃、40%RHの雰囲気に移し10分間放置した時の吸湿率を求め、1分間当たりの吸湿率の減少率によって求められるものである。
【0009】
但し、本発明における樹脂層によっては、高吸放湿吸湿発熱性有機微粒子の吸水量が大きすぎる場合、膜の膨潤、粒子の脱離等が発生する場合があるため、上記の吸湿性、放湿性に加え、粒子の吸水量比(絶乾した粒子の重量(A)及び該粒子に純水を添加して24時間放置後、余分の水をデカンテーションで除いた後の全体の重量(B)を測定し、(B−A)/Aから求める)が0.4以上であり、かつ10未満であることが好ましく、0.6以上4未満がより好ましい。
【0010】
高吸放湿吸湿発熱性有機微粒子は、架橋構造を有し、かつスルホン酸基、カルボン酸基、リン酸基あるいはそれらの塩などの極性基を有するものであり、その例としては、ニトリル基を有するビニルモノマーが50重量%以上よりなる高ニトリル系重合体にヒドラジン処理により架橋構造を導入し、これによる窒素含有量の増加が1.0〜15.0重量%であり、残存しているニトリル基量の1.0mmol/g以上を加水分解により塩型カルボキシル基に化学変換せしめたものやポリスチレン系、ポリアクリロニトリル系、ポリアクリルエステル系、ポリメタアクリルエステル系のいずれかの重合体でスルホン酸基、カルボン酸基、リン酸基あるいはそれらの塩が導入され、ジビニルベンゼンあるいはトリアリルイソシアヌレートなどの架橋性ビニル化合物で架橋されたものなどが挙げられる。
【0011】
高ニトリル系重合体としては、アクリロニトリル、メタクリロニトリル、α-クロロアクリロニトリルなどのニトリル基を有するビニルモノマーが50重量%以上重合されてなる重合体であり、ニトリル基がヒドラジン系化合物によって架橋することができるものである。主体とするモノマーは、アクリロニトリルがコストの点で好ましく、共重合されるモノマーとしては、ニトリル基を有するビニルモノマーと共重合できるモノマーであれば限定されない。
【0012】
ヒドラジン系化合物としては、水加ヒドラジン、硫酸ヒドラジン、塩酸ヒドラジン、硝酸ヒドラジンなどのヒドラジンの塩類、グアニジン、メラミンなどのヒドラジン誘導体である。
【0013】
ポリスチレン系、ポリアクリロニトリル系、ポリアクリルエステル系、ポリメタアクリルエステル系の重合体としては、それぞれスチレン、アクリル酸エステル、メタアクリル酸エステルを主体とし、スルホン酸基、カルボン酸基、リン酸基あるいはそれらの塩などの極性基を導入できるビニルモノマー及び重合体中に架橋構造を導入できるビニルモノマーが共重合されたものである。極性基の導入及び架橋構造の導入は、重合段階又は重合体の後処理のいずれでもよい。架橋構造の導入に好適な化合物は、ジビニルベンゼンあるいはトリアリルイソシアヌレートである。
【0014】
共重合されるモノマーの例としては、アクリル酸、メタクリル酸、マレイン酸などの不飽和カルボン酸類及びこれらの塩、(メタ)アクリル酸メチル、(メタ)アクリル酸エチルなどの(メタ)アクリル酸エステル類、メチルビニルケトンなどの不飽和ケトン類、酢酸ビニルなどのビニルエステル類、メチルビニルエーテルなどのビニルエーテル類、アクリルアミド類、ビニルスルホン酸、スチレンスルホン酸などの不飽和スルホン酸及びこれらの塩、メチルスチレンなどのスチレン化合物、アリルアルコール類ビニルピリジンなどの塩基性ビニル化合物アクロレインなどの不飽和アルデヒド類グリシジルメタアクリレート、N−メチロールアクリルアミド、ヒドロキシエチルメタアクリレート、トリアリルイソシアヌレート、ジビニルベンゼンなどの架橋性ビニル化合物などを挙げることができる。
【0015】
これらの有機微粒子の極性基の塩としては、特に限定はなく、その用途に応じて適宜選択できる。具体的には、Li、Na、Kなどのアルカリ金属、Mg、Ca、Baなどのアルカリ土類金属、Cu、Zn、Al、Ag、Niなどの他の金属、NH4、アミンなどの有機の陽イオンを挙げることができ、これらが混合されていてもよい。吸湿発熱性の点で、Na、Caが好ましい。
【0016】
高吸放湿吸湿発熱性有機微粒子の樹脂添加時の吸湿率はベース樹脂が非水系である場合、樹脂の粘度異常と関係のある重要な要素である。粘度異常を避けるためには、樹脂溶液に高吸放湿吸湿発熱性有機微粒子を直接添加する場合においても、また湿式分散等のために一旦溶剤を多くして粘度を下げた樹脂に高吸放湿吸湿発熱性有機微粒子を添加して分散液を作成する場合においても、粒子の水分率を20%以下にすることが必要であり、好ましくは、16%以下、更に好ましくは12%以下である。
【0017】
高吸放湿吸湿発熱性有機微粒子の平均粒径は、吸湿、放湿速度の向上、また樹脂層からの脱離防止、布帛のざらつき防止の観点より平均粒径30μm以下が必要であり、10μm以下が好ましく、5μm以下がより好ましい。
【0018】
なお、高吸放湿吸湿発熱性有機微粒子の平均粒径を低減する方法としては、例えばボールミル、ビーズミル、サンドミル、2本、3本ロールミル、ニーダーなどの湿式分散法等があるが、上記粒径が得られるならば本方法に限定されない。つまり、本高吸放湿吸湿発熱性有機微粒子の平均粒径を30μm以下に出来る方法であればいずれの方法を使用してもよい。なお、例えば湿式分散処理を行う際、分散処理のために一旦溶剤を多くして粘度を下げておき、分散処理完了後、溶剤濃度の低い、あるいは溶剤なしのベース樹脂を添加する事により粉体とベース樹脂固形分の比、また粘度を目標値に合わせる方法を採用してもよい。
【0019】
本発明における初期衣服内湿度低減値とは、着用者の発汗時の蒸れ感の程度に関係する尺度であり、この値が大きいほど蒸れ感が少ないことを示すものであり、下記の実施例に示す測定法で測定した値である。外気が高湿度であると透湿能力が落ちるため、着用者は発汗時に蒸れを感じ不快となる。高湿度環境での発汗時における初期衣服内湿度低減効果は、透湿防水布帛の高湿度下での快適性を決定する極めて重要な要素であり、初期衣服内湿度低減値は、3%以上であることが必須であり、5%以上がより好ましい。
【0020】
基布と樹脂層(湿式膜)との剥離強度は透湿防水布帛の耐久性を決定する極めて重要な要素であり、本測定値が5.8N/2.5cm以上であることが好ましく、7.8N/2.5cm以上であることがより好ましい。
【0021】
高吸放湿吸湿発熱性有機微粒子の樹脂層中における含有量は、保温性と関係のある重要な要素である。保温性の効果を出すためには、樹脂層に対して1〜100重量%であり、好ましくは10〜50重量%であり、より好ましくは15〜40重量%である。1重量%未満では吸湿発熱、衣服内湿度低減、結露防止効果に乏しく、50重量%を超えると外観が不良となり、また膜としての強度低下が著しくなる。
【0022】
本発明の樹脂組成物を基布上に付与する方法は、湿式コーティング法、即ち、基布上に樹脂組成物をコーティング後、水中に浸漬して樹脂を凝固させ、溶媒を水中に抽出し、乾燥、熱処理する方法である。
【0023】
本方法で作成した透湿防水布帛に、耐水圧向上、膜(樹脂層)面の撥水性付与等の目的でさらに後加工を施してもかまわない。またその方法としては、例えばコーティング法、パディング法、スプレー法等、いかなる方法も採用できる。
【0024】
【実施例】
以下に実施例により本発明を詳細に説明するが、本発明は何らこれらに限定されるものではない。また、実施例における透湿防水布帛の性能の測定、評価は次の方法で行った。なお、以下で単に部、%と表示したものは、重量部、重量%を示す。
衣服内湿度の測定方法:
特公平1−19098号公報に示された衣服内気候シミュレーション装置にて測定を行った。
測定条件は以下の通りである。
▲1▼外部環境温湿度:20℃、相対湿度95%
▲2▼風洞部環境:送風機、整流器より20℃、相対湿度95%の外気を風速1
m/secで導入した。
▲3▼人体条件再現部:
(1)擬似皮膚材質:ポリテトラフルオロエチレンフィルム(孔径5μm)
(2)発汗量:350g/m2・hr(模擬皮膚、サンプル無しでのボッ
クス内水量減少より測定)
▲4▼衣服内気候部:試料−模擬皮膚間隔:6mm
【0025】
試料を20℃、相対湿度65%の環境に24時間以上置くことで布帛の調温調湿を行い、その後サンプルを取り出して直ちに樹脂層の存在する面を擬似皮膚側に向けて配置し、温湿度センサー(サンプリング間隔1秒)により衣服内の相対湿度(%)の測定を開始し、1分間測定後、測定を終了する。
この測定の中での相対湿度(%)の最小値を求め、測定開始時の相対湿度(%)との差を、本測定の初期衣服内湿度低減値(△I)(%)として表記した。
【0026】
剥離強度:
JIS L 1089法により測定した。なお、試験片をあらかじめ5cm剥離しておく方法としては、試験片の膜面に熱接着テープをアイロンで接着後、基布と熱接着テープを剥離することで行った。単位:N/2.5cm
【0027】
高吸放湿吸湿発熱性有機微粒子の水分率(吸湿率)(%):
高吸放湿吸湿発熱性有機微粒子の20℃、65%RHでの重量を測定し、次に該高吸放湿吸湿発熱性有機微粒子を70℃で12時間真空乾燥した後の重量を測定後、下記計算式により求めた。
水分率(%)=(乾燥前重量−乾燥後重量)÷乾燥前重量×100
【0028】
高吸放湿吸湿発熱性有機微粒子の粒径:
実施例あるいは比較例で得られた布帛の断面を1000倍の電子顕微鏡で撮影し、その写真をたて5cm×よこ5cmの正方形に分割し、正方形を任意に3箇所選んで中の粒子の粒径を測定し、平均した。単位:μm
【0029】
吸湿発熱温度差:
樹脂層を有するサンプル布帛および高吸放湿吸湿発熱性有機微粒子を含まない樹脂層を有するブランク布帛(下記比較例4)をそれぞれ絶乾(乾燥条件:120℃、3時間)したのちデシケーターに入れ、このデシケーターを、32℃、相対湿度70%の環境下に10時間以上置くことで布帛の調温を行った後、布帛の取り出し直後から30秒間、布帛の表面温度を日本電気三栄株式会社製THERMO TRACER TH3100及びDETECTOR UNIT TH3100で測定する。これらの布帛の表面温度の中でのそれぞれの最高温度(℃)を求めて、△T=T(サンプル)−T(ブランク)により吸湿発熱温度差△Tの値を算出する。
T(サンプル):上記樹脂層を有する布帛を絶乾し、絶乾状態のまま32℃に調温した後、32℃、相対湿度70%の環境下に布帛を置いた直後から30秒間における樹脂層を有する面の表面温度の最高温度(℃)。
T(ブランク):ブランク布を絶乾し、絶乾状態のまま32℃に調温した後、32℃、相対湿度70%の環境下に布帛を置いた直後から30秒間における樹脂層を有する面の表面温度の最高温度(℃)。
【0030】
透湿度:JIS L 1099 (A−1法)で測定した。単位:g/m2・24hr
【0031】
耐水圧:JIS L 1092 (低水圧法)で測定した。単位:Pa/cm2
【0032】
(1)コーティング用基布の製造
経糸、緯糸の双方にナイロン77dtex/96fを用い、仕上がりの密度が経糸125本/2.54cm、緯糸が101本/2.54cmになるように設計し、ジッガー染色機で酸性染料で染色して加工用布帛を得た。その後、フッ素系撥水剤のアサヒガード710(旭硝子社製造)1%owfをパッド−ドライ法で付与した後、155℃×1.5分間の熱処理を行った。次いで、170℃で圧力290N/cm2の条件でカレンダー処理を行い、コーティング用基布とした。
【0033】
(2)高吸放湿吸湿発熱性有機微粒子の製造
a)高吸放湿吸湿発熱性有機微粒子1
アクリロニトリル450部、アクリル酸メチル20部、p−スチレンスルホン酸ソーダ16部及び水1220部をオートクレーブに入れ、重合開始剤としてジ−tert−ブチルパーオキサイドを単量体全量に対して0.6%添加した後、密閉し、次いで攪拌下において152℃の温度にて20分間重合せしめた後、反応終了後、攪拌を継続しながら90℃まで冷却し、平均粒子径0.9μm(光散乱光度計で測定)の原料微粒子の水分散体を得た。
【0034】
この水分散体に浴中濃度が33%になるようにヒドラジンを加え、102℃で3時間架橋処理を行い、続いて浴中濃度が10%となるようにNaOHを加え、103℃で8.5時間の加水分解処理を行った後、流水中で透析、脱塩、乾燥後、高吸放湿吸湿発熱性の微粒子を得た。該有機微粒子の窒素増加量は3.2%、塩系カルボキシル基4.6mmol/g、65%RH(20℃)の吸湿率は49%、平均粒子径は50μmであった。
【0035】
該有機微粒子を70℃で12時間真空乾燥後、65%RH(20℃)の雰囲気下に10分間放置後の吸湿率は10.6%であり、24時間後は49%であった。
また、90%RH(20℃)の雰囲気下での24時間後の吸湿率は78%であり、その後40%RH(20℃)の雰囲気に移した際、10分後の吸湿率は67%、また24時間後の吸湿率は28%であり、吸放湿性が確認された。
【0036】
b)高吸放湿吸湿発熱性有機微粒子2
メタクリル酸/p−スチレンスルホン酸ソーダ=70/30の水溶性重合体300部及び硫酸ナトリウム30部を6400部の水に溶解し、櫂型撹拌機付きの重合槽に仕込んだ。次にアクリル酸メチル2710部およびジビニルベンゼン301部に2,2'−アゾビスー(2,4−ジメチルバレロニトリル)14部を溶解して重合槽に仕込み、500rpmの撹件条件下、60℃で2時間重合し、重合率88%で平均粒子径50μmのアクリル酸メチル/ジビニルベンゼン共重合体を得た。該重合体104部を水910部中に分散し、これに101部の苛性ソーダを添加し、91℃、2時間反応を行い、アクリル酸メチルのメチルエステル部を加水分解することによりカルボキシル基4.5ミリ当量/gを有した架橋重合体を得た。得られた重合体を水中に分散し、洗浄、脱水、乾燥し高吸放湿吸湿発熱性の微粒子を得た。
【0037】
該有機微粒子の65%RH(20℃)の吸湿率は47%、平均粒子径は51μmであった。
該有機微粒子を70℃で12時間真空乾燥後、65%RH(20℃)の雰囲気下に10分間放置後の吸湿率は10.8%であり、24時間後は51%であった。
また、90%RH(20℃)の雰囲気下での24時間後の吸湿率は81%であり、その後40%RH(20℃)の雰囲気に移した際、10分後の吸湿率は69%、また24時間後の吸湿率は29%であり、吸放湿性が確認された。
また本粒子の吸水量比は2.6であった。
【0038】
(3)ベース樹脂
MP829(大日本インキ(株)製湿式レザー加工用ウレタン樹脂、固形分濃度20%、DMF溶液)
【0039】
(4)架橋剤
コロネート2507(日本ポリウレタン(株)製 ヘキサメチレンジイソシアネート系ブロックイソシアネート架橋剤、固形分濃度80%)
コロネートHX(日本ポリウレタン(株)製 ヘキサメチレンジイソシアネート系架橋剤、固形分濃度100%)
【0040】
[実施例1]
本実施例で用いる樹脂組成物の製造を次の方法で行った。
上記で製造した高吸放湿吸湿発熱性有機微粒子1を70℃で12時間真空乾燥後、シリカゲルの入ったデシケーターに粉砕後の微粒子を入れ、冷却した。冷却後の高吸放湿吸湿発熱性有機微粒子1の粒径は50μm、吸湿率は9%であった。冷却後、上記の高吸放湿吸湿発熱性有機微粒子1の100部に対し、DMF135部を添加し、次に上記MP−829の原液113.8部を添加、混合して分散液を調製した。
この分散液1kgに対し、シンマルエンタープライゼス製ダイノミルKDL−PILOTを用いて2時間の分散処理を行った。分散処理中の液温は40℃、分散液粘度は0.6Pa・sであった。
【0041】
分散処理終了後、本分散液100部に対しMP−829の原液を570部添加してコーティング液を調製した。この時の樹脂の粘度は7Pa・sであった。
次にコロネート2507を上記コーティング液100部に対し1.25部添加(架橋剤固形分としては1部)し、前記コーティング基布に対し100ミクロンのクリアランスを持つアプリケーターで塗布した。
続いて本布帛を水中に10分間浸漬してDMFの抽出及び膜の凝固を行い、次いで50℃の温水中に浸漬してさらに残留DMF抽出後、乾燥機(120℃)で3分間乾燥し、その後150℃で3分間のキュアリング処理をして透湿防水布帛を得た。これより、本透湿防水布に付与した樹脂層中の高吸放湿吸湿発熱性有機微粒子の割合(水分なし)は40%と計算される。該透湿防水布の物性を表1に示す。
【0042】
[実施例2]
上記高吸放湿吸湿発熱性有機微粒子2を70℃で12時間真空乾燥し、乾燥実施後、シリカゲルの入ったデシケーターに粉砕後の微粒子を入れ、冷却した。冷却後の高吸放湿吸湿発熱性有機微粒子2の粒径は52μm、吸湿率は9%であった。
冷却後、上記の高吸放湿吸湿発熱性有機微粒子2の100部に対し、DMF135部を添加し、次に上記MP−829の原液113.8部を添加、混合して分散液を調製した。
この分散液1kgに対し、シンマルエンタープライゼス製ダイノミルKDL−PILOTを用いて2時間の分散処理を行った。分散処理中の液温は40℃、分散液粘度は0.7Pa・sであった。
【0043】
分散処理終了後、本分散液100部に対しMP−829の原液を570部添加してコーティング液を調製した。この時の樹脂の粘度は8Pa・sであった。
次にコロネート2507を上記コーティング液100部に対し1.25部添加(架橋剤固形分としては1部)し、前記コーティング基布に対し100ミクロンのクリアランスを持つアプリケーターで塗布した。
続いて本布帛を水中に10分間浸漬してDMFの抽出及び膜の凝固を行い、次いで50℃の温水中に浸漬してさらに残留DMF抽出後、乾燥機(120℃)で3分間乾燥し、その後150℃で3分間のキュアリング処理をして透湿防水布帛を得た。これより、本透湿防水布に付与した樹脂層中の高吸放湿吸湿発熱性有機微粒子の割合(水分なし)は40%と計算される。該透湿防水布の物性を表1に示す。
【0044】
[実施例2]
上記実施例1において、コロネート2507の量を2.5部(架橋剤固形分としては2部)とする以外は実施例1と全く同一の方法により透湿防水布を試作した。該透湿防水布の物性を表1に示す。
【0045】
[比較例1]
上記実施例1において、架橋剤を添加しない以外は実施例1と全く同一の方法により透湿防水布を試作した。該透湿防水布の物性を表2に示す。
【0046】
[比較例2]
上記実施例1において、架橋剤をコロネートHXとし、架橋剤添加量を1部(架橋剤固形分として1部)とする以外は実施例1と全く同一の方法により透湿防水布を試作した。該透湿防水布の物性を表2に示す。
【0047】
[比較例3]
上記実施例1において、架橋剤コロネートHXとし、架橋剤添加量を2部(架橋剤固形分として2部)とする以外は実施例1と全く同一の方法により透湿防水布を試作した。該透湿防水布の物性を表2に示す。
【0048】
[比較例4]
吸湿発熱温度差評価用のブランク布帛の製造を次の方法で行った。
MP−829の樹脂100部に対しDMFを35部添加してコーティング液を調製した。この時の樹脂の粘度は7Pa・sであった。
次にコロネートHXを上記コーティング液100部に対し1部添加(架橋剤固形分としては1部)し、前記コーティング基布に対し100ミクロンのクリアランスを持つアプリケーターで塗布した。
続いて本布帛を水中に10分間浸漬してDMFの抽出及び膜の凝固を行い、次いで50℃の温水中に浸漬してさらに残留DMF抽出後、乾燥機(120℃)で3分間乾燥し、その後150℃で3分間のキュアリング処理をして透湿防水布帛を得た。該透湿防水布の物性を表2に示す。
【0049】
[比較例5]
他社製の透湿防水布を購入し、サンプルとして評価した。該透湿防水布の物性を表2に示す。
【0050】
【表1】

Figure 0004583539
【0051】
【表2】
Figure 0004583539
【0052】
表1、2に示したように、実施例1、2による透湿防水布は、比較例1〜3の透湿防水布に比べ、基布と樹脂膜(層)との間の剥離強力に優れたものであり、加えて他物性(初期衣服内湿度低減値、耐水圧、透湿度、吸湿発熱温度差)に非常に優れたものであることがわかる。
また比較例4は、高吸放湿吸湿発熱性有機微粒子を添加しないために剥離強力は高いが、初期衣服内湿度低減効果及び吸湿発熱効果はなく、また透湿度も非常に低いものであった。
また市販品である比較例5は、実施例1、2の透湿防水布に対し、高湿度下での初期衣服内湿度低減値が低いものであった。
【0053】
【発明の効果】
本発明で得られる透湿防水布帛は、高吸放湿吸湿発熱性有機微粒子を樹脂層中に含有することで優れた高湿度下での初期衣服内湿度低減効果及び吸湿発熱効果、透湿性を有し、さらにブロックイソシアネート系の架橋剤を用いることによって、着用快適性と樹脂層の高い剥離耐久性を両立できるものである。[0001]
BACKGROUND OF THE INVENTION
The present invention is used for sports clothing such as rain clothing, mountain climbing, athletics, skiing, snowboarding, golf, etc., casual clothing such as men's, women's clothing, and coats, and various clothing such as uniforms working in various outer garments, freezers, refrigerators, etc. The present invention relates to a moisture permeable and waterproof fabric that has an effect of generating heat, reducing humidity in clothes, and preventing condensation, and also being excellent in reducing humidity in clothes under high humidity.
[0002]
[Prior art]
Textile products that require heat insulation include general clothing (suits, coats, etc.) used in winter, winter clothing (jumpers, etc.), winter sports clothing such as skis, uniforms that work in freezers, refrigerators, etc. Various methods have been proposed to increase the dead air layer by reducing the fiber diameter of the fiber assembly in order to improve heat retention, and to expect the effect of far infrared rays by kneading ceramics or metal into the fiber.
As a method for improving the heat retaining property, for example, as a method of kneading ceramics or metal into a fiber, a fiber product manufacturing method disclosed in JP-A-63-105107 or a far-infrared ray for mite prevention disclosed in JP-A-7-331484 There has been proposed a method of kneading ceramics and metals that radiate far-infrared rays into fibers such as radiating fibers. However, these methods have a drawback that the strength of the raw yarn is reduced or the raw yarn is colored by kneading ceramics and metal.
As a method for adding ceramics or metal to the coating agent or the laminate resin, there are a sheet-like material having an excellent heat retaining effect disclosed in JP-A-60-162641, a coating fabric disclosed in JP-A-63-35887, Japanese Unexamined Patent Publication No. 1-183579 discloses a cloth coated with ceramics or a paper product. However, these methods provide heat retention but are derived from the moisture absorption / release properties of the additive.
The effect of reducing moisture in clothes and preventing condensation was not obtained.
On the other hand, as a method for preventing the stuffiness at the time of wearing the moisture permeable waterproof clothing and improving the dew condensation prevention property, the waterproof sheet of JP-A-56-17256, JP-A-56-20679, JP-A-60- Hygroscopic waterproofing sheet disclosed in Japanese Patent No. 52675, Non-breathable hygroscopic waterproofing sheet disclosed in Japanese Patent Application Laid-Open No. 60-110440, Japanese Unexamined Patent Application Publication No. 60-126386, and anti-condensation waterproofing disclosed in Japanese Patent Application Publication No. A sheet, a moisture-permeable waterproof fabric disclosed in JP-A-7-9631, a moisture-absorbing / releasing waterproof-coated fabric disclosed in JP-A-3-97970, and the like are disclosed.
However, these are intended to prevent dew condensation, and are not intended to combine both anti-condensation property and heat generation effect.
In addition, since the conventional moisture-permeable waterproof fabric allows moisture to permeate using the difference between the vapor pressure in the clothes and the vapor pressure of the outside air, if the outside air is at high humidity, the moisture-permeable ability is reduced. There was a drawback that it was stuffy and uncomfortable.
[0003]
[Problems to be solved by the invention]
Therefore, the present inventors previously absorbed fine moisture having high moisture absorption and moisture absorption exothermic heat by adsorbing moisture released from the human body by attaching moisture permeable resin to the fiber fabric as an adhesive, and generating heat. The problem was solved by a method of obtaining a moisture permeable waterproof fabric having a moisture absorption / release property that reduces moisture in clothes and prevents condensation, and was able to obtain moisture absorption exotherm, humidity reduction effect in clothes, and moisture permeability.
However, in a coating method in which a resin layer having a hygroscopic heat generation and moisture-in-clothing reducing effect is applied to the fabric, the resin composition is coated on a base fabric (fiber fabric) and then immersed in water to solidify the resin, When using the method of extracting into water and drying, the disadvantage of weak peel strength between the resin layer and the base fabric formed due to the effect of the highly hygroscopic and hygroscopic organic fine particles became clear and improved. The need arises.
An object of the present invention is to provide a moisture-permeable waterproof fabric that does not feel stuffy when sweated even when worn under high humidity, and further has improved peel strength between a resin layer and a base fabric.
[0004]
[Means for Solving the Problems]
  That is, the present invention has the following configuration.
1. A moisture permeable waterproof fabric having a resin composition layer containing organic fine particles with high moisture absorption and desorption and moisture absorption on at least one side of a fiber fabric,
  High absorption / release moisture absorption exothermic organic fine particles introduced a crosslinked structure into a high nitrile polymer composed of 50% by weight or more of a vinyl monomer having a nitrile group by hydrazine treatment, and 1.0 mmol / g or more is chemically converted into a salt-type carboxyl group by hydrolysis or / and a sulfonic acid group in any one of a polystyrene, polyacrylonitrile, polyacrylic ester, or polymethacrylic ester polymer, Carboxylic acid groups, phosphoric acid groups or their salts are introduced and crosslinked with a crosslinkable vinyl compound,
  The resin composition layer is obtained by using blocked isocyanate as a crosslinking agent in the base resin,
  The base resin is a resin containing 60% or more of a urethane resin,
  A moisture-permeable waterproof fabric characterized by having an initial garment moisture reduction value (ΔI) of 3% or more.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
Examples of the fiber fabric (base fabric) used in the present invention include polyester, polyamide, polyacrylonitrile and other synthetic fibers, rayon, semi-synthetic fibers such as acetate, and fabrics made of natural fibers such as cotton, silk and wool, Examples include knitted fabrics and non-woven fabrics. Moreover, you may give other post-processing, for example, water-repellent processing, etc. to said base fabric.
[0007]
The base resin for forming the resin layer in the present invention is a resin that can form a microporous film with a known urethane resin, and other resins such as a silicon resin, a polyester resin, a polyamide resin, and the like, or A mixture of these resins or the like may contain a non-aqueous solvent resin in a proportion of 40% by weight or less. In addition, other additives such as titanium oxide and silica may be added to the resin layer.
[0008]
The high moisture absorption / release moisture-exothermic organic fine particles in the present invention are organic particles having high hygroscopicity and moisture-releasing properties and exhibiting heat generation upon moisture absorption, and moisture at a relative humidity (RH) of 65%. High hygroscopicity with a rate (moisture absorption) of 25% or more, and excellent hygroscopic heat generation when the initial moisture absorption rate is 0.6% / min or more, preferably 0.8% / min or more. It is necessary to get sex. The moisture content is preferably 30% or more, more preferably 40% or more, and the initial moisture absorption rate is preferably 0.6% / min or more, more preferably 0.8% / min or more, and further preferably 1.0%. Organic fine particles of at least% / min.
Moreover, regarding moisture release, the initial moisture release rate at 20 ° C, 90% RH to 20 ° C, 40% RH is 0.8% / min or more. From the viewpoint, it is more preferably 1.0% / min or more.
The initial moisture absorption rate is obtained by calculating the moisture absorption rate when left in an atmosphere of 20 ° C. × 65% RH for 10 minutes after vacuum drying at 70 ° C. × 12 hours, and by the rate of increase in the moisture absorption rate per minute. The initial moisture release rate is the moisture absorption rate when the moisture is absorbed at 20 ° C. and 90% RH for 24 hours and then transferred to an atmosphere of 20 ° C. and 40% RH and left for 10 minutes. It is calculated | required by the decreasing rate of a moisture absorption rate.
[0009]
However, depending on the resin layer in the present invention, if the water absorption amount of the highly moisture-absorbing and moisture-absorbing exothermic organic fine particles is too large, membrane swelling, particle detachment, etc. may occur. In addition to wetness, the water absorption ratio of the particles (weight of completely dry particles (A) and the total weight after adding excess water by decantation after adding pure water to the particles for 24 hours (B ) And (obtained from (B-A) / A) is 0.4 or more and preferably less than 10 and more preferably 0.6 or more and less than 4.
[0010]
Highly absorbing and releasing moisture-absorbing exothermic organic fine particles are those having a crosslinked structure and having a polar group such as a sulfonic acid group, a carboxylic acid group, a phosphoric acid group or a salt thereof. A high nitrile polymer comprising 50% by weight or more of a vinyl monomer having a hydrogen content is introduced with a crosslinked structure by hydrazine treatment, resulting in an increase in nitrogen content of 1.0 to 15.0% by weight and remaining. Sulfurone with a nitrile group content of 1.0 mmol / g or more that has been chemically converted to a salt-type carboxyl group by hydrolysis, or a polystyrene, polyacrylonitrile, polyacrylic ester, or polymethacrylic ester polymer. Crosslinkable vinyl such as divinylbenzene or triallyl isocyanurate, in which acid groups, carboxylic acid groups, phosphoric acid groups or salts thereof are introduced Examples thereof include those crosslinked with a compound.
[0011]
The high nitrile polymer is a polymer obtained by polymerizing 50% by weight or more of a vinyl monomer having a nitrile group such as acrylonitrile, methacrylonitrile, α-chloroacrylonitrile, and the nitrile group is crosslinked by a hydrazine compound. It is something that can be done. The main monomer is acrylonitrile from the viewpoint of cost, and the monomer to be copolymerized is not limited as long as it is a monomer that can be copolymerized with a vinyl monomer having a nitrile group.
[0012]
Examples of the hydrazine compounds include hydrazine salts such as hydrazine hydrate, hydrazine sulfate, hydrazine hydrochloride, and hydrazine nitrate, and hydrazine derivatives such as guanidine and melamine.
[0013]
Polystyrene-based, polyacrylonitrile-based, polyacrylic ester-based, and polymethacrylic ester-based polymers mainly include styrene, acrylic acid ester, and methacrylic acid ester, respectively, sulfonic acid group, carboxylic acid group, phosphoric acid group, or A vinyl monomer capable of introducing a polar group such as a salt thereof and a vinyl monomer capable of introducing a crosslinked structure into the polymer are copolymerized. The introduction of the polar group and the introduction of the crosslinked structure may be performed either in the polymerization stage or in the post-treatment of the polymer. A compound suitable for introducing a crosslinked structure is divinylbenzene or triallyl isocyanurate.
[0014]
Examples of monomers to be copolymerized include unsaturated carboxylic acids such as acrylic acid, methacrylic acid and maleic acid and salts thereof, (meth) acrylic acid esters such as methyl (meth) acrylate and ethyl (meth) acrylate. , Unsaturated ketones such as methyl vinyl ketone, vinyl esters such as vinyl acetate, vinyl ethers such as methyl vinyl ether, acrylamides, unsaturated sulfonic acids such as vinyl sulfonic acid and styrene sulfonic acid, and salts thereof, methyl styrene Styrene compounds such as: Allyl alcohols Basic vinyl compounds such as vinyl pyridine Unsaturated aldehydes such as acrolein Glycidyl methacrylate, N-methylolacrylamide, hydroxyethyl methacrylate, triallyl isocyanurate, divinylbenze And a crosslinkable vinyl compound such as
[0015]
There is no limitation in particular as a salt of the polar group of these organic fine particles, According to the use, it can select suitably. Specifically, alkali metals such as Li, Na, and K, alkaline earth metals such as Mg, Ca, and Ba, other metals such as Cu, Zn, Al, Ag, and Ni, NHFour, Organic cations such as amines can be mentioned, and these may be mixed. Na and Ca are preferable in terms of moisture absorption exothermicity.
[0016]
When the base resin is non-aqueous, the moisture absorption rate at the time of addition of the highly absorbing / releasing / absorbing exothermic organic fine particles is an important factor related to the viscosity abnormality of the resin. In order to avoid viscosity abnormalities, even when directly adding high moisture-absorbing / absorbing exothermic organic fine particles to the resin solution, or by increasing the solvent once for wet dispersion etc. Even in the case of preparing a dispersion by adding moisture-absorbing exothermic organic fine particles, the moisture content of the particles needs to be 20% or less, preferably 16% or less, more preferably 12% or less. .
[0017]
The average particle size of the highly absorbing / releasing / absorbing exothermic organic fine particles is required to be 30 μm or less from the viewpoint of moisture absorption, improvement of moisture releasing rate, prevention of detachment from the resin layer, and prevention of roughness of the fabric. The following is preferable, and 5 μm or less is more preferable.
[0018]
In addition, examples of a method for reducing the average particle size of the highly absorbing / releasing moisture-absorbing exothermic organic fine particles include a wet dispersion method such as a ball mill, a bead mill, a sand mill, a two-roll mill, a kneader, and the like. Is not limited to this method. That is, any method may be used as long as the average particle size of the high moisture absorption / release moisture-absorbing exothermic organic fine particles can be reduced to 30 μm or less. For example, when performing a wet dispersion process, the viscosity is lowered by increasing the solvent once for the dispersion process, and after the dispersion process is completed, a base resin having a low solvent concentration or no solvent is added. A method of adjusting the ratio of the solid content of the base resin and the viscosity to the target value may be employed.
[0019]
In the present invention, the initial garment moisture reduction value is a measure related to the degree of stuffiness during sweating of the wearer, and indicates that the greater the value, the less stuffiness, and in the examples below. It is the value measured by the measuring method shown. When the outside air is at a high humidity, the moisture permeability is reduced, so that the wearer feels stuffy when sweating and becomes uncomfortable. The effect of reducing moisture in the initial garment when sweating in a high humidity environment is an extremely important factor that determines the comfort of the moisture-permeable and waterproof fabric under high humidity. It is essential that 5% or more is more preferable.
[0020]
The peel strength between the base fabric and the resin layer (wet film) is an extremely important factor for determining the durability of the moisture-permeable and waterproof fabric, and the measured value is preferably 5.8 N / 2.5 cm or more. More preferably, it is 8 N / 2.5 cm or more.
[0021]
The content of the highly absorbing / releasing moisture absorbing exothermic organic fine particles in the resin layer is an important factor related to heat retention. In order to exert a heat retaining effect, the content is 1 to 100% by weight, preferably 10 to 50% by weight, more preferably 15 to 40% by weight, based on the resin layer. If it is less than 1% by weight, the effect of moisture absorption heat generation, reduction of moisture in clothes and anti-condensation is poor, and if it exceeds 50% by weight, the appearance is poor and the strength as a film is significantly reduced.
[0022]
The method of applying the resin composition of the present invention on the base fabric is a wet coating method, that is, after coating the resin composition on the base fabric, it is immersed in water to solidify the resin, and the solvent is extracted into water. It is a method of drying and heat treatment.
[0023]
The moisture permeable waterproof fabric produced by this method may be further subjected to post-processing for the purpose of improving water pressure resistance and imparting water repellency to the membrane (resin layer) surface. As the method, any method such as a coating method, a padding method, and a spray method can be adopted.
[0024]
【Example】
EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. Moreover, the measurement of the performance of the moisture-permeable waterproof fabric in an Example and evaluation were performed with the following method. In addition, what was simply displayed below as a part and% shows a weight part and weight%.
How to measure moisture in clothes:
Measurement was carried out with an in-clothes climate simulation apparatus disclosed in Japanese Patent Publication 1-19098.
The measurement conditions are as follows.
(1) External temperature and humidity: 20 ° C, relative humidity 95%
(2) Wind tunnel environment: Air temperature of 20 ° C and relative humidity 95% from the blower and rectifier.
It was introduced at m / sec.
(3) Human condition reproduction part:
(1) Pseudo skin material: polytetrafluoroethylene film (pore size 5 μm)
(2) Sweat volume: 350 g / m2・ Hr (simulated skin, without sample
Measured from a decrease in water volume in the coke)
(4) Climate part in clothing: Sample-simulated skin distance: 6 mm
[0025]
The sample is placed in an environment of 20 ° C. and a relative humidity of 65% for 24 hours or more to adjust the temperature and humidity of the fabric. Then, the sample is taken out and immediately placed with the surface on which the resin layer exists facing the artificial skin. Measurement of relative humidity (%) in clothes is started by a humidity sensor (sampling interval 1 second), and measurement is finished after one minute.
The minimum value of the relative humidity (%) in this measurement was obtained, and the difference from the relative humidity (%) at the start of the measurement was expressed as the initial clothing humidity reduction value (ΔI) (%) of this measurement. .
[0026]
Peel strength:
It was measured by JIS L 1089 method. In addition, as a method of exfoliating the test piece by 5 cm in advance, it was carried out by exfoliating the base fabric and the thermoadhesive tape after bonding the thermoadhesive tape to the film surface of the test piece with an iron. Unit: N / 2.5cm
[0027]
Moisture content (moisture absorption rate) (%) of highly absorbing and releasing moisture absorbing exothermic organic fine particles:
After measuring the weight of the organic fine particles with high moisture absorption / desorption / moisture absorption at 20 ° C. and 65% RH, and measuring the weight after vacuum drying the organic particles with high moisture absorption / desorption / moisture absorption exothermic for 12 hours at 70 ° C. The following formula was used.
Moisture content (%) = (weight before drying−weight after drying) ÷ weight before drying × 100
[0028]
Particle size of organic particles with high moisture absorption / release moisture absorption:
The cross section of the fabric obtained in the example or the comparative example was taken with a 1000 × electron microscope, the photograph was divided into 5 cm × 5 cm squares, and three squares were arbitrarily selected to make particles of particles inside. The diameter was measured and averaged. Unit: μm
[0029]
Hygroscopic temperature difference:
A sample fabric having a resin layer and a blank fabric having a resin layer not containing high moisture absorption / release moisture absorption exothermic organic fine particles (Comparative Example 4 below) were each completely dried (drying conditions: 120 ° C., 3 hours) and then placed in a desiccator. After the temperature of the fabric was adjusted by placing this desiccator in an environment of 32 ° C. and a relative humidity of 70% for 10 hours or more, the surface temperature of the fabric was made by NEC Sanei Co., Ltd. for 30 seconds immediately after taking out the fabric. Measured with THERMO TRATER TH3100 and DETECTOR UNIT TH3100. The maximum temperature (° C.) among the surface temperatures of these fabrics is obtained, and the value of the moisture absorption heat generation temperature difference ΔT is calculated from ΔT = T (sample) −T (blank).
T (sample): The fabric having the resin layer was completely dried, adjusted to 32 ° C. in a completely dried state, and then placed in an environment of 32 ° C. and 70% relative humidity for 30 seconds immediately after placing the fabric. Maximum surface temperature (° C) of the surface having the layer.
T (blank): A surface having a resin layer for 30 seconds from immediately after placing a fabric in an environment of 32 ° C. and a relative humidity of 70% after the blank fabric is completely dried and adjusted to 32 ° C. in a completely dried state. Maximum surface temperature (° C).
[0030]
Moisture permeability: Measured in accordance with JIS L 1099 (A-1 method). Unit: g / m2・ 24hr
[0031]
Water pressure resistance: Measured by JIS L 1092 (low water pressure method). Unit: Pa / cm2
[0032]
(1) Manufacturing of coating fabric
Nylon 77dtex / 96f is used for both the warp and weft, and the finished density is designed to be 125 warps / 2.54cm and 101 wefts / 2.54cm. A fabric for processing was obtained. Thereafter, 1% owf of Asahi Guard 710 (manufactured by Asahi Glass Co., Ltd.), a fluorine-based water repellent, was applied by a pad-dry method, and then heat treatment was performed at 155 ° C. for 1.5 minutes. Next, the pressure is 290 N / cm at 170 ° C.2A calendar treatment was performed under the conditions described above to obtain a coating base fabric.
[0033]
(2) Production of highly absorbing / releasing moisture-absorbing exothermic organic fine particles
a) High moisture absorption and absorption moisture exothermic organic fine particles 1
450 parts of acrylonitrile, 20 parts of methyl acrylate, 16 parts of p-styrene sulfonic acid soda and 1220 parts of water are placed in an autoclave, and di-tert-butyl peroxide as a polymerization initiator is 0.6% based on the total amount of monomers. After the addition, the mixture was sealed, and then polymerized with stirring at a temperature of 152 ° C. for 20 minutes. After the reaction was completed, the mixture was cooled to 90 ° C. while continuing stirring, and an average particle size of 0.9 μm (light scattering photometer ) Was obtained.
[0034]
To this aqueous dispersion, hydrazine was added so that the concentration in the bath was 33%, and a crosslinking treatment was performed at 102 ° C. for 3 hours. Subsequently, NaOH was added so that the concentration in the bath was 10%. After hydrolyzing for 5 hours, dialysis, desalting and drying in running water were performed to obtain fine particles with high moisture absorption, moisture absorption and exotherm. The organic fine particles had an increase in nitrogen of 3.2%, a salt carboxyl group of 4.6 mmol / g, a moisture absorption of 65% RH (20 ° C.) of 49%, and an average particle size of 50 μm.
[0035]
The organic fine particles were vacuum-dried at 70 ° C. for 12 hours and then left to stand in an atmosphere of 65% RH (20 ° C.) for 10 minutes.
Further, the moisture absorption after 24 hours in an atmosphere of 90% RH (20 ° C.) is 78%, and then the moisture absorption after 10 minutes is 67% when transferred to an atmosphere of 40% RH (20 ° C.). Further, the moisture absorption after 24 hours was 28%, and the moisture absorption / release property was confirmed.
[0036]
b) High moisture absorption and absorption moisture exothermic organic fine particles 2
300 parts of a water-soluble polymer of methacrylic acid / p-sodium styrenesulfonate = 70/30 and 30 parts of sodium sulfate were dissolved in 6400 parts of water and charged into a polymerization tank equipped with a vertical stirrer. Next, 14 parts of 2,2′-azobis- (2,4-dimethylvaleronitrile) was dissolved in 2710 parts of methyl acrylate and 301 parts of divinylbenzene and charged into the polymerization tank, and the mixture was charged at 60 ° C. under a stirring condition of 500 rpm. Polymerization was carried out over time to obtain a methyl acrylate / divinylbenzene copolymer having a polymerization rate of 88% and an average particle size of 50 μm. Disperse 104 parts of the polymer in 910 parts of water, add 101 parts of caustic soda to this, react at 91 ° C. for 2 hours, and hydrolyze the methyl ester part of methyl acrylate, thereby adding 4. A crosslinked polymer having 5 meq / g was obtained. The obtained polymer was dispersed in water, washed, dehydrated and dried to obtain highly absorbent moisture-absorbing exothermic fine particles.
[0037]
The organic fine particles had a moisture absorption rate of 65% RH (20 ° C.) of 47% and an average particle size of 51 μm.
The organic fine particles were vacuum-dried at 70 ° C. for 12 hours, and left to stand in an atmosphere of 65% RH (20 ° C.) for 10 minutes.
Further, the moisture absorption rate after 24 hours in an atmosphere of 90% RH (20 ° C.) is 81%, and then the moisture absorption rate after 10 minutes is 69% when transferred to an atmosphere of 40% RH (20 ° C.). Further, the moisture absorption after 24 hours was 29%, and the moisture absorption / release property was confirmed.
The water absorption ratio of the particles was 2.6.
[0038]
(3) Base resin
MP829 (Dai Nippon Ink Co., Ltd. urethane resin for wet leather processing, solid content concentration 20%, DMF solution)
[0039]
(4) Cross-linking agent
Coronate 2507 (produced by Nippon Polyurethane Co., Ltd. Hexamethylene diisocyanate block isocyanate crosslinking agent, solid content concentration 80%)
Coronate HX (manufactured by Nippon Polyurethane Co., Ltd., hexamethylene diisocyanate crosslinking agent, solid content concentration 100%)
[0040]
[Example 1]
The resin composition used in this example was produced by the following method.
The high-absorption / moisture-absorption exothermic organic fine particles 1 produced above were vacuum-dried at 70 ° C. for 12 hours, and then the pulverized fine particles were placed in a desiccator containing silica gel and cooled. The particle size of the highly absorbing / releasing / absorbing exothermic organic fine particles 1 after cooling was 50 μm, and the moisture absorption rate was 9%. After cooling, 135 parts of DMF was added to 100 parts of the above-mentioned high moisture-absorbing and moisture-absorbing exothermic organic fine particles 1, and then 113.8 parts of the MP-829 stock solution was added and mixed to prepare a dispersion. .
A dispersion treatment for 2 hours was performed on 1 kg of this dispersion using a Dynomill KDL-PILOT manufactured by Shinmaru Enterprises. The liquid temperature during the dispersion treatment was 40 ° C., and the dispersion liquid viscosity was 0.6 Pa · s.
[0041]
After the completion of the dispersion treatment, 570 parts of MP-829 stock solution was added to 100 parts of this dispersion to prepare a coating solution. At this time, the viscosity of the resin was 7 Pa · s.
Next, 1.25 parts of coronate 2507 was added to 100 parts of the coating solution (1 part as the solid content of the cross-linking agent), and applied to the coating base fabric with an applicator having a clearance of 100 microns.
Subsequently, this fabric is immersed in water for 10 minutes to extract DMF and coagulate the membrane, then immersed in warm water at 50 ° C. and further extracted with residual DMF, and then dried in a dryer (120 ° C.) for 3 minutes. Thereafter, a moisture permeable waterproof fabric was obtained by curing at 150 ° C. for 3 minutes. From this, the ratio of moisture absorption / release moisture exothermic organic fine particles in the resin layer applied to the moisture permeable waterproof cloth (no moisture) is calculated to be 40%. Table 1 shows the physical properties of the moisture permeable waterproof cloth.
[0042]
[Example 2]
The high moisture-absorbing / moisture-absorbing exothermic organic fine particles 2 were vacuum-dried at 70 ° C. for 12 hours, and after drying, the pulverized fine particles were put into a desiccator containing silica gel and cooled. After cooling, the highly absorbent moisture-absorbing exothermic organic fine particles 2 had a particle size of 52 μm and a moisture absorption rate of 9%.
After cooling, 135 parts of DMF was added to 100 parts of the above-mentioned highly absorbing / releasing moisture-absorbing exothermic organic fine particles 2, and then 113.8 parts of the MP-829 stock solution was added and mixed to prepare a dispersion. .
A dispersion treatment for 2 hours was performed on 1 kg of this dispersion using a Dynomill KDL-PILOT manufactured by Shinmaru Enterprises. The liquid temperature during the dispersion treatment was 40 ° C., and the dispersion liquid viscosity was 0.7 Pa · s.
[0043]
After the completion of the dispersion treatment, 570 parts of MP-829 stock solution was added to 100 parts of this dispersion to prepare a coating solution. At this time, the viscosity of the resin was 8 Pa · s.
Next, 1.25 parts of coronate 2507 was added to 100 parts of the coating solution (1 part as the solid content of the cross-linking agent), and applied to the coating base fabric with an applicator having a clearance of 100 microns.
Subsequently, this fabric is immersed in water for 10 minutes to extract DMF and coagulate the membrane, then immersed in warm water at 50 ° C. and further extracted with residual DMF, and then dried in a dryer (120 ° C.) for 3 minutes. Thereafter, a moisture permeable waterproof fabric was obtained by curing at 150 ° C. for 3 minutes. From this, the ratio of moisture absorption / release moisture exothermic organic fine particles in the resin layer applied to the moisture permeable waterproof cloth (no moisture) is calculated to be 40%. Table 1 shows the physical properties of the moisture permeable waterproof cloth.
[0044]
[Example 2]
A moisture-permeable waterproof cloth was produced in the same manner as in Example 1 except that the amount of coronate 2507 was 2.5 parts (2 parts as the solid content of the crosslinking agent) in Example 1. Table 1 shows the physical properties of the moisture permeable waterproof cloth.
[0045]
[Comparative Example 1]
In Example 1 above, a moisture-permeable waterproof cloth was prototyped by the same method as Example 1 except that no crosslinking agent was added. Table 2 shows the physical properties of the moisture permeable waterproof cloth.
[0046]
[Comparative Example 2]
In Example 1, a moisture-permeable waterproof cloth was produced in the same manner as in Example 1 except that the crosslinking agent was Coronate HX and the amount of the crosslinking agent added was 1 part (1 part as the crosslinking agent solid content). Table 2 shows the physical properties of the moisture permeable waterproof cloth.
[0047]
[Comparative Example 3]
A moisture-permeable waterproof cloth was produced in the same manner as in Example 1 except that the crosslinking agent Coronate HX was used in Example 1 and the amount of the crosslinking agent added was 2 parts (2 parts as the solid content of the crosslinking agent). Table 2 shows the physical properties of the moisture permeable waterproof cloth.
[0048]
[Comparative Example 4]
A blank fabric for evaluating the moisture absorption exothermic temperature difference was produced by the following method.
A coating solution was prepared by adding 35 parts of DMF to 100 parts of MP-829 resin. At this time, the viscosity of the resin was 7 Pa · s.
Next, 1 part of coronate HX was added to 100 parts of the above coating solution (1 part as the solid content of the crosslinking agent), and applied to the coating base fabric with an applicator having a clearance of 100 microns.
Subsequently, this fabric is immersed in water for 10 minutes to extract DMF and coagulate the membrane, then immersed in warm water at 50 ° C. and further extracted with residual DMF, and then dried in a dryer (120 ° C.) for 3 minutes. Thereafter, a moisture permeable waterproof fabric was obtained by curing at 150 ° C. for 3 minutes. Table 2 shows the physical properties of the moisture permeable waterproof cloth.
[0049]
[Comparative Example 5]
Another manufacturer's breathable waterproof cloth was purchased and evaluated as a sample. Table 2 shows the physical properties of the moisture permeable waterproof cloth.
[0050]
[Table 1]
Figure 0004583539
[0051]
[Table 2]
Figure 0004583539
[0052]
As shown in Tables 1 and 2, the moisture-permeable waterproof fabrics according to Examples 1 and 2 are more resistant to peeling between the base fabric and the resin film (layer) than the moisture-permeable waterproof fabrics of Comparative Examples 1 to 3. In addition to this, it can be seen that the other physical properties (initial clothing moisture reduction value, water pressure resistance, moisture permeability, moisture absorption heat generation temperature difference) are very excellent.
In Comparative Example 4, the peel strength was high because no high moisture absorption / desorption moisture absorption exothermic organic fine particles were added, but there was no effect of reducing moisture in the initial garment and no moisture absorption heat generation, and the moisture permeability was very low. .
Moreover, the comparative example 5 which is a commercial item was a thing with a low humidity reduction value in the initial clothes under high humidity with respect to the moisture-permeable waterproof cloth of Example 1,2.
[0053]
【The invention's effect】
The moisture permeable waterproof fabric obtained by the present invention has excellent moisture absorption and moisture absorption exothermic effect, moisture absorption exothermic effect and moisture permeability under high humidity by containing high moisture absorption and desorption moisture exothermic organic fine particles in the resin layer. Furthermore, by using a blocked isocyanate-based crosslinking agent, it is possible to achieve both wearing comfort and high peeling durability of the resin layer.

Claims (1)

繊維布帛の少なくとも片面に、高吸放湿吸湿発熱性有機微粒子を含有する樹脂組成物層を有する透湿防水布帛であって、
高吸放湿吸湿発熱性有機微粒子が、ニトリル基を有するビニルモノマーが50重量%以上よりなる高ニトリル系重合体にヒドラジン処理により架橋構造を導入し、残存しているニトリル基の1.0mmol/g以上を加水分解により塩型カルボキシル基に化学変換せしめたものであるか又は/及びポリスチレン系、ポリアクリロニトリル系、ポリアクリルエステル系、ポリメタアクリルエステル系のいずれかの重合体にスルホン酸基、カルボン酸基、リン酸基あるいはそれらの塩が導入され、架橋性ビニル化合物で架橋されたものであり、
樹脂組成物層がベース樹脂中に架橋剤としてブロックイソシアネートを使用することにより得られたものであり、
前記ベース樹脂がウレタン樹脂を60%以上含む樹脂であり、
初期衣服内湿度低減値(△I)が3%以上であることを特徴とする透湿防水布帛。
A moisture permeable waterproof fabric having a resin composition layer containing organic fine particles with high moisture absorption and desorption and moisture absorption on at least one side of a fiber fabric ,
High absorption / release moisture absorption exothermic organic fine particles introduced a crosslinked structure into a high nitrile polymer composed of 50% by weight or more of a vinyl monomer having a nitrile group by hydrazine treatment, and 1.0 mmol / g or more is chemically converted into a salt-type carboxyl group by hydrolysis or / and a sulfonic acid group in any one of a polystyrene, polyacrylonitrile, polyacrylic ester, or polymethacrylic ester polymer, Carboxylic acid groups, phosphoric acid groups or their salts are introduced and crosslinked with a crosslinkable vinyl compound,
The resin composition layer is obtained by using blocked isocyanate as a crosslinking agent in the base resin,
The base resin is a resin containing 60% or more of a urethane resin,
A moisture-permeable waterproof fabric characterized by having an initial garment moisture reduction value (ΔI) of 3% or more.
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