JP6785156B2 - 発泡シート - Google Patents
発泡シート Download PDFInfo
- Publication number
- JP6785156B2 JP6785156B2 JP2016520177A JP2016520177A JP6785156B2 JP 6785156 B2 JP6785156 B2 JP 6785156B2 JP 2016520177 A JP2016520177 A JP 2016520177A JP 2016520177 A JP2016520177 A JP 2016520177A JP 6785156 B2 JP6785156 B2 JP 6785156B2
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- JP
- Japan
- Prior art keywords
- foam
- sheet according
- weight
- foamed sheet
- impact
- 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.)
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- C08J5/18—Manufacture of films or sheets
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- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
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Description
本発明の他の目的は、小型化、薄型化されていても、また発熱量の大きい発熱体を備えていても、落下時の衝撃により破損しにくい電気・電子機器を提供することにある。
衝撃吸収変化率(%)={(高温圧縮後の衝撃吸収率b−初期の衝撃吸収率a)/初期の衝撃吸収率a}×100
初期の衝撃吸収率a:試験片Aの衝撃吸収率(%)
高温圧縮後の衝撃吸収率b(%):試験片Aの初期厚みに対して60%圧縮した状態で試験片Aを80℃×72時間保存した後、圧縮状態を解除し、その後23℃×24時間経過後に測定した衝撃吸収率(%)
衝撃吸収率:振り子型衝撃試験機を用いた衝撃吸収性試験(衝撃子の重さ28g、振り上げ角度40°)(23℃)において、下記式で定義される値
衝撃吸収率(%)={(F0−F1)/F0}×100
(上記式において、F0は支持板のみに衝撃子を衝突させた時の衝撃力のことであり、F1は支持板と試験片Aとからなる構造体の支持板上に衝撃子を衝突させた時の衝撃力のことである)
CS={(t0−t1)/(t0−t2)}×100
CS:圧縮永久歪み(%)
t0:試験片の元の厚さ(mm)
t1:試験片を圧縮装置から取り外し、30分後の試験片の厚さ(mm)
t2:圧縮歪みを加えた状態での試験片の厚さ(mm)
なお、本発明において、圧縮永久歪みは、試験片を60%圧縮したときの値である。
衝撃吸収変化率(%)={(高温圧縮後の衝撃吸収率b−初期の衝撃吸収率a)/初期の衝撃吸収率a}×100
初期の衝撃吸収率a:試験片Aの衝撃吸収率(%)
高温圧縮後の衝撃吸収率b(%):試験片Aの初期厚みに対して60%圧縮した状態で試験片Aを80℃×72時間保存した後、圧縮状態を解除し、その後23℃×24時間経過後に測定した衝撃吸収率(%)
衝撃吸収率:振り子型衝撃試験機を用いた衝撃吸収性試験(衝撃子の重さ28g、振り上げ角度40°)(23℃)において、下記式で定義される値
衝撃吸収率(%)={(F0−F1)/F0}×100
(上記式において、F0は支持板のみに衝撃子を衝突させた時の衝撃力のことであり、F1は支持板と試験片Aとからなる構造体の支持板上に衝撃子を衝突させた時の衝撃力のことである)
<80℃応力保持率>
試験片(発泡シート)を80℃の雰囲気下に30分間保持した後、引張試験機を用い、80℃で、チャック間距離40mmにてセットし、引張速度500mm/minで50%延伸後、120秒間保持する操作を行い、最大荷重と120秒後の荷重を計測し、下記式により80℃応力保持率を求める
80℃応力保持率(%)=[120秒後の荷重(N)/最大荷重(N)]×100
アクリルエマルション溶液(固形分量55%、アクリル酸エチル−アクリル酸ブチル−アクリロニトリル共重合体(重量比45:48:7))100重量部、シリコーン系化合物A(ジメチルシリコーンオイル、数平均分子量Mn:7.16×103、重量平均分子量Mw:1.71×104、固形分(不揮発分)量100%)1重量部、脂肪酸アンモニウム系界面活性剤(ステアリン酸アンモニウムの水分散液、固形分量33%)3重量部、オキサゾリン系架橋剤(「エポクロスWS−500」日本触媒社製、固形分量39%)2.0重量部、ベンゾトリアゾールナトリウム塩(固形分40%)(防錆剤)1重量部、ポリアクリル酸系増粘剤(アクリル酸エチル−アクリル酸共重合体(アクリル酸20重量%)、固形分量28.7%)0.8重量部をディスパー(「ロボミックス」プライミクス社製)で撹拌混合して起泡化した。この発泡組成物を、剥離処理をしたPET(ポリエチレンテレフタレート)フィルム(厚さ:38μm、商品名「MRF♯38」三菱樹脂社製)上に塗布し、70℃で4.5分、140℃で4.5分乾燥させ、厚さ100μm、見掛け密度0.34g/cm3、気泡率65.7%、最大セル径72.5μm、最小セル径28.5μm、平均セル径45μmの連続気泡構造の発泡体(発泡シート)を得た。
アクリルエマルション溶液(固形分量55%、アクリル酸エチル−アクリル酸ブチル−アクリロニトリル共重合体(重量比45:48:7))100重量部、シリコーン系化合物A(ジメチルシリコーンオイル、数平均分子量Mn:7.16×103、重量平均分子量Mw:1.71×104、固形分(不揮発分)量100%)1重量部、脂肪酸アンモニウム系界面活性剤(ステアリン酸アンモニウムの水分散液、固形分量33%)3重量部、オキサゾリン系架橋剤(「エポクロスWS−500」日本触媒社製、固形分量39%)0.35重量部、ベンゾトリアゾールナトリウム塩(固形分40%)(防錆剤)1重量部、ポリアクリル酸系増粘剤(アクリル酸エチル−アクリル酸共重合体(アクリル酸20重量%)、固形分量28.7%)0.8重量部をディスパー(「ロボミックス」プライミクス社製)で撹拌混合して起泡化した。この発泡組成物を、剥離処理をしたPET(ポリエチレンテレフタレート)フィルム(厚さ:38μm、商品名「MRF♯38」三菱樹脂社製)上に塗布し、70℃で4.5分、140℃で4.5分乾燥させ、厚さ100μm、見掛け密度0.45g/cm3、気泡率54.5%、最大セル径87.5μm、最小セル径48.5μm、平均セル径65μmの連続気泡構造の発泡体(発泡シート)を得た。
アクリルエマルション溶液(固形分量55%、アクリル酸エチル−アクリル酸ブチル−アクリロニトリル共重合体(重量比45:48:7))100重量部、シリコーン系化合物A(ジメチルシリコーンオイル、数平均分子量Mn:7.16×103、重量平均分子量Mw:1.71×104、固形分(不揮発分)量100%)1重量部、脂肪酸アンモニウム系界面活性剤(ステアリン酸アンモニウムの水分散液、固形分量33%)3重量部、オキサゾリン系架橋剤(「エポクロスWS−500」日本触媒社製、固形分量39%)0.35重量部、ベンゾトリアゾールナトリウム塩(固形分40%)(防錆剤)1重量部、ポリアクリル酸系増粘剤(アクリル酸エチル−アクリル酸共重合体(アクリル酸20重量%)、固形分量28.7%)0.8重量部をディスパー(「ロボミックス」プライミクス社製)で撹拌混合して起泡化した。この発泡組成物を、剥離処理をしたPET(ポリエチレンテレフタレート)フィルム(厚さ:38μm、商品名「MRF♯38」三菱樹脂社製)上に塗布し、70℃で4.5分、140℃で4.5分乾燥させ、厚さ120μm、見掛け密度0.26g/cm3、気泡率73.7%、最大セル径57.5μm、最小セル径15.3μm、平均セル径30μmの連続気泡構造の発泡体(発泡シート)を得た。
アクリルエマルション溶液(固形分量55%、アクリル酸エチル−アクリル酸ブチル−アクリロニトリル共重合体(重量比45:48:7))100重量部、シリコーン系化合物A(ジメチルシリコーンオイル、数平均分子量Mn:7.16×103、重量平均分子量Mw:1.71×104、固形分(不揮発分)量100%)1重量部、脂肪酸アンモニウム系界面活性剤(ステアリン酸アンモニウムの水分散液、固形分量33%)3重量部、ベンゾトリアゾールナトリウム塩(固形分40%)(防錆剤)1重量部、ポリアクリル酸系増粘剤(アクリル酸エチル−アクリル酸共重合体(アクリル酸20重量%)、固形分量28.7%)0.8重量部をディスパー(「ロボミックス」プライミクス社製)で撹拌混合して起泡化した。この発泡組成物を、剥離処理をしたPET(ポリエチレンテレフタレート)フィルム(厚さ:38μm、商品名「MRF♯38」三菱樹脂社製)上に塗布し、70℃で4.5分、140℃で4.5分乾燥させ、厚さ130μm、見掛け密度0.37g/cm3、気泡率62.6%、最大セル径82.5μm、最小セル径43.5μm、平均セル径60μmの連続気泡構造の発泡体(発泡シート)を得た。
ポリプロピレン[メルトフローレート(MFR):0.35g/10min]:45重量部、ポリオレフィン系エラストマーと軟化剤(パラフィン系伸展油)の混合物(MFR(230℃):6g/10分、JIS A硬度:79°、軟化剤をポリオレフィン系エラストマー100質量部に対して30質量部配合):55重量部、水酸化マグネシウム:10重量部、カーボン(商品名「旭♯35」旭カーボン株式会社製):10重量部、ステアリン酸モノグリセリド:1重量部、及び脂肪酸アミド(ラウリン酸ビスアミド):1.5重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、13(注入後12)MPaの圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスは、ペレット全量に対して5.6重量%の割合で注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから円筒状に押出して、発泡体の内側表面を冷却するマンドレルと、押出機の環状ダイから押し出された円筒状の発泡体の外側表面を冷却する発泡体冷却用エアリングの間を通過させ、直径の一部を切断してシート状に展開して長尺発泡体原反を得た。この長尺発泡体原反において、平均セル径は55μm、見掛け密度は0.041g/cm3であった。
この長尺発泡体原反を所定の幅に切断し(スリット加工)、連続スライス装置(スライスライン)を用いて、1面ずつ表面の低発泡層を剥がしとり、樹脂発泡体を得た。
上記樹脂発泡体を、誘導発熱ロールの温度を160℃、ギャップを0.20mmにセットした上記連続処理装置内を通過させることにより、片面を熱で溶融処理して、スリット加工し、その後巻き取って、巻回体を得た。なお、引き取り速度は、20m/minとした。
次に、上記巻回体を巻き戻して、誘導発熱ロールの温度を160℃、ギャップを0.10mmにセットした上記連続処理装置内を通過させることにより、溶融処理がされていない面(未処理面)を熱で溶融処理して、スリット加工し、その後巻き取って、両面が熱溶融処理された厚さ100μm、見掛け密度0.12g/cm3、気泡率88%、最大セル径90μm、最小セル径30μm、平均セル径60μmの連続気泡構造の発泡体(発泡シート)を得た。
実施例及び比較例で得られた発泡体(発泡シート)について、以下の評価を行った。結果を表1及び表2に示す。なお、表1に、各実施例、比較例における各成分の配合部数(重量部)[固形分(不揮発分)換算]を示す。「Em」はエマルションを示す。
低真空走査電子顕微鏡(「S−3400N型走査電子顕微鏡」日立ハイテクサイエンスシステムズ社製)により、発泡体断面の拡大画像を取り込み、画像解析することにより平均セル径(μm)を求めた。なお解析した気泡数は10〜20個程度である。同様にして、発泡シートの最小セル径(μm)及び最大セル径(μm)を求めた。
100mm×100mmの打抜き刃型にて発泡体(発泡シート)を打抜き、打抜いた試料の寸法を測定する。また、測定端子の直径(φ)20mmである1/100ダイヤルゲージにて厚さを測定する。これらの値から発泡体の体積を算出した。
次に、発泡体の重量を最小目盛り0.01g以上の上皿天秤にて測定する。これらの値より発泡体の見掛け密度(g/cm3)を算出した。
粘弾性測定装置(「ARES2KFRTN1−FCO」TA Instruments Japan社製)のフィルム引張り測定モードにて、角振動数1rad/sで温度分散性試験を行った。その際の貯蔵弾性率E'と損失弾性率E''の比率である損失正接(tanδ)のピークトップの温度(℃)と強度(最大値)を測定した。
表2の「tanδ温度」の欄に、発泡体の損失正接(tanδ)のピークトップの温度(℃)を記載し、「tanδ最大値」の欄に、該ピークトップの強度(最大値)を記載した。
実施例及び比較例で得られた発泡シート(サンプルサイズ:30mm×30mm)を試験片とした。この試験片を用い、80℃で、圧縮永久歪み試験を行った(JIS K6262の規定に準じる)。より具体的には、試験片を80℃の雰囲気下で圧縮し(圧縮された試験片の厚さが、元の厚さの40%の厚さになるまで圧縮する)、その状態を24時間保持した後、試験片を圧縮状態から解放し、23℃で30分放置し、23℃で試験片の厚さを測定した。そして、80℃での圧縮永久歪み(%)を下記式により求めた。
CS={(t0−t1)/(t0−t2)}×100
CS:圧縮永久歪み(%)
t0:試験片の元の厚さ(mm)
t1:試験片を圧縮装置から取り外し、30分後の試験片の厚さ(mm)
t2:圧縮歪みを加えた状態での試験片の厚さ(mm)
実施例及び比較例で得られた発泡シート(サンプルサイズ:20mm×20mm)(試験片A)について、前記の振り子型衝撃試験機(衝撃試験装置)(図1及び図2参照)を用い、23℃、衝撃子の重さ28g、振り上げ角度40°の条件で衝撃吸収性試験を行った。このとき得られた衝撃吸収率を初期の衝撃吸収率aとする。
次に、試験片Aの初期厚みに対して60%圧縮した状態で試験片Aを80℃×72時間保存した後、圧縮状態を解除し、その後23℃×24時間経過後に、上記と同様、23℃、衝撃子の重さ28g、振り上げ角度40°の条件で衝撃吸収性試験を行った。このとき得られた衝撃吸収率を高温圧縮後の衝撃吸収率bとする。
そして、下記式により、衝撃吸収変化率(%)を求めた。
衝撃吸収変化率(%)={(高温圧縮後の衝撃吸収率b−初期の衝撃吸収率a)/初期の衝撃吸収率a}×100
なお、衝撃吸収率は下記式で定義される値である。
衝撃吸収率(%)={(F0−F1)/F0}×100
(上記式において、F0は支持板のみに衝撃子を衝突させた時の衝撃力、F1は支持板と試験片Aとからなる構造体の支持板上に衝撃子を衝突させた時の衝撃力である)
実施例及び比較例で得られた発泡シート[サンプルの形状及びサイズ:ダンベル1号(JIS K6251参照)]を80℃の雰囲気下に30分間保持した後、引張試験機を用い、80℃で、チャック間距離40mmにてセットし、引張速度500mm/minで50%延伸後、120秒間保持する操作を行い、最大荷重と120秒後の荷重を計測し、下記式により80℃応力保持率を求めた。
80℃応力保持率(%)=[120秒後の荷重(N)/最大荷重(N)]×100
2 試験片(発泡シート)
3 保持部材
4 衝撃負荷部材
5 圧力センサー
11 固定治具
12 押さえ治具
16 圧力調整手段
20 支柱
21 アーム
22 支持棒(シャフト)の一端
23 支持棒(シャフト)
24 衝撃子
25 電磁石
28 支持板
a 振り上げ角度
Claims (18)
- 平均セル径が10〜200μmの発泡体で構成され、
前記発泡体は、発泡体を形成する樹脂材料としてアクリル系ポリマーを含み、さらに、架橋剤、シリコーン系化合物、及び界面活性剤を含み、気泡構造が連続気泡構造であり、
80℃での圧縮永久歪みが80%以下であり、下記で定義される衝撃吸収変化率が±20%以下である発泡シート。
衝撃吸収変化率(%)={(高温圧縮後の衝撃吸収率b−初期の衝撃吸収率a)/初期の衝撃吸収率a}×100
初期の衝撃吸収率a:試験片Aの衝撃吸収率(%)
高温圧縮後の衝撃吸収率b(%):試験片Aの初期厚みに対して60%圧縮した状態で試験片Aを80℃×72時間保存した後、圧縮状態を解除し、その後23℃×24時間経過後に測定した衝撃吸収率(%)
衝撃吸収率:振り子型衝撃試験機を用いた衝撃吸収性試験(衝撃子の重さ28g、振り上げ角度40°)(23℃)において、下記式で定義される値
衝撃吸収率(%)={(F0−F1)/F0}×100
(上記式において、F0は支持板のみに衝撃子を衝突させた時の衝撃力のことであり、F1は支持板と試験片Aとからなる構造体の支持板上に衝撃子を衝突させた時の衝撃力のことである) - 厚さが30〜1000μmであり、前記発泡体の見掛け密度が0.2〜0.7g/cm3である請求項1記載の発泡シート。
- 前記発泡体が、動的粘弾性測定における角振動数1rad/sでの貯蔵弾性率と損失弾性率の比率である損失正接(tanδ)が−30℃以上30℃以下の範囲にピークトップを有する請求項1又は2記載の発泡シート。
- 前記シリコーン系化合物がシロキサン結合2000以下のシリコーン化合物である請求項1〜3の何れか1項に記載の発泡シート。
- 発泡体が、エマルション樹脂組成物を機械的に発泡させる工程Aを経て形成される請求項1〜4の何れか1項に記載の発泡シート。
- 発泡体が、さらに、機械的に発泡させたエマルション樹脂組成物を基材上に塗工して乾燥する工程Bを経て形成される請求項5に記載の発泡シート。
- 前記工程Bが、基材上に塗布した気泡含有エマルション樹脂組成物を50℃以上125℃未満で乾燥する予備乾燥工程B1と、その後さらに125℃以上200℃以下で乾燥する本乾燥工程B2を含んでいる請求項6記載の発泡シート。
- 前記80℃での圧縮永久歪みが50%以下である請求項1〜7の何れか1項に記載の発泡シート。
- 前記80℃での圧縮永久歪みが25%以下である請求項8に記載の発泡シート。
- 厚さが40〜500μmである請求項2〜9の何れか1項に記載の発泡シート。
- 厚さが50〜300μmである請求項10に記載の発泡シート。
- 前記発泡体の見掛け密度が0.21〜0.6g/cm3である請求項2〜11の何れか1項に記載の発泡シート。
- 前記発泡体の見掛け密度が0.22〜0.5g/cm3である請求項12に記載の発泡シート。
- 発泡体の片面又は両面に粘着剤層を有する請求項1〜13の何れか1項に記載の発泡シート。
- 電気・電子機器用衝撃吸収シートとして用いられる請求項1〜14の何れか1項に記載の発泡シート。
- 前記界面活性剤がアニオン性界面活性剤である請求項1〜15の何れか1項に記載の発泡シート。
- 請求項1〜16の何れか1項に記載の発泡シートが用いられている電気・電子機器。
- 表示部材を備えた電気・電子機器であって、請求項1〜15の何れか1項に記載の発泡シートが該電気又は電子機器の筐体と前記表示部材との間に挟持された構造を有する請求項17記載の電気・電子機器。
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