JP6759491B1 - 複合積層体及びその製造方法 - Google Patents
複合積層体及びその製造方法 Download PDFInfo
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- JP6759491B1 JP6759491B1 JP2020539098A JP2020539098A JP6759491B1 JP 6759491 B1 JP6759491 B1 JP 6759491B1 JP 2020539098 A JP2020539098 A JP 2020539098A JP 2020539098 A JP2020539098 A JP 2020539098A JP 6759491 B1 JP6759491 B1 JP 6759491B1
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Abstract
Description
本発明の複合積層体を構成するA層は、平均繊維長が1μm〜300μmである強化繊維(a1)と、体積平均粒子径が0.01μm〜100μmである球状粒子(a11)と、熱可塑性樹脂(a2)とを含むフィルム(a3)により形成されている。A層が後述するB層の片面上又は両面上に存在する。A層が、本複合積層体の表層、裏層、又は表裏層に存在することで、成形時の離型性、複合積層体の表面平滑性及び機械的物性に優れ、さらに加工性及び塗装密着性にも優れる。
フィルム(a3)に使用する強化繊維(a1)は、繊維状粒子から構成される粉末であり、平均繊維長が1μm〜300μmであり、好ましくは1μm〜200μmであり、より好ましくは3μm〜100μmであり、さらに好ましくは5μm〜50μmである。
フィルム(a3)に使用する球状粒子(a11)は、シリカ、ガラスビーズ、ガラスバルーン、アルミナ、炭酸カルシウム、炭酸マグネシウム等が挙げられ、好ましくはシリカ、アルミナおよびガラスビーズよりなる群から選ばれる少なくとも1種である。
フィルム(a3)に使用する熱可塑性樹脂(a2)としては、フィルム化できる熱可塑性樹脂であれば特に限定されないが、例えば、ポリプロピレン(PP)樹脂、ポリエチレン(PE)樹脂、環状ポリオレフィン(COP)樹脂、環状オレフィン・コポリマー(COC)樹脂等のポリオレフィン樹脂;ポリスチレン(PS)樹脂、シンジオタクチックポリスチレン(SPS)樹脂、耐衝撃性ポリスチレン(HIPS)樹脂、アクリロニトリル−ブチレン−スチレン共重合体(ABS)樹脂、メタクリル酸メチル/スチレン共重合体(MS)、メタクリル酸メチル/スチレン/ブタジエン共重合体(MBS)、スチレン/ブタジエン共重合体(SBR)、スチレン/イソプレン共重合体(SIR)、スチレン/イソプレン/ブタジエン共重合体(SIBR)、スチレン/ブタジエン/スチレン共重合体(SBS)、スチレン/イソプレン/スチレン共重合体(SIS)、スチレン/エチレン/ブチレン/スチレン共重合体(SEBS)、スチレン/エチレン/プロピレン/スチレン共重合体(SEPS)等のポリスチレン系樹脂;ポリ乳酸(PLA)樹脂、ポリエチレンテレフタレート(PET)樹脂、ポリブチレンテレフタレート(PBT)樹脂、ポリシクロヘキセレンジメチレンテレフタレート(PCT)樹脂等のポリエステル系樹脂;ポリアセタール(POM)樹脂;ポリカーボネート(PC)樹脂;ポリアミド6樹脂、ポリアミド66樹脂、ポリアミド11樹脂、ポリアミド12樹脂、ポリアミド46樹脂、ポリアミド6C樹脂、ポリアミド9C樹脂、ポリアミド6樹脂とポリアミド66樹脂の共重合体(ポリアミド6/66樹脂)、ポリアミド6樹脂とポリアミド12樹脂の共重合体(ポリアミド6/12樹脂)等の脂肪族ポリアミド(PA)樹脂;ポリアミドMXD6樹脂、ポリアミドMXD10樹脂、ポリアミド6T樹脂、ポリアミド9T樹脂、ポリアミド10T樹脂等の芳香環を有する構造単位と有さない構造単位からなる半芳香族ポリアミド(PA)樹脂;ポリフェニレンサルファイド(PPS)樹脂;ポリエーテルサルフォン(PES)樹脂;液晶ポリエステル(LCP)樹脂;ポリエーテルケトン(PEK)樹脂、ポリエーテルエーテルケトン(PEEK)樹脂、ポリエーテルケトンケトン(PEKK)樹脂、ポリエーテルエーテルケトンケトン(PEEKK)等のポリエーテル芳香族ケトン樹脂;ポリエーテルイミド(PEI)樹脂;ポリアミドイミド(PAI)樹脂;熱可塑性ポリイミド(TPI)樹脂;ポリフッ化ビニリデン(PVDF)、ポリフッ化ビニル(PVF)、エチレン/テトラフルオロエチレン共重合体(ETFE)等のフッ素系樹脂等を例示することができる。上記熱可塑性樹脂から選ばれる相溶性のある2種以上の熱可塑性樹脂同士の混合物、すなわちポリマーアロイ等も使用できる。
フィルム(a3)は、その好ましい物性を損なわない範囲において、その他添加剤を含有することができる。その他添加剤としては、アラミド繊維、ポリフェニレンベンズオキサゾール(PBO)繊維、ガラス繊維、炭素繊維、アルミナ繊維、ボロン繊維、炭化ケイ素繊維、炭酸カルシウム、雲母、マイカ、セリサイト、イライト、タルク、カオリナイト、モンモリナイト、ベーマイト、スメクタイト、バーミキュライト、二酸化チタン、チタン酸カリウム、チタン酸リチウムカリウム、ベーマイト等の上述の強化繊維(a1)及び上述の球状粒子(a11)以外の充填材;ポリテトラフルオロエチレン(PTFE)、低密度ポリエチレン、直鎖状低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、超高分子量ポリエチレン等のポリオレフィン樹脂、グラファイト、二硫化モリブテン、二硫化タングステン、窒化ホウ素等の固体潤滑剤;銅化合物等の熱安定剤;ヒンダードフェノール系光安定剤等の光安定剤;核形成剤;アニオン性帯電防止剤、カチオン性帯電防止剤、非イオン系帯電防止剤等の帯電防止剤;老化防止剤(酸化防止剤);耐候剤;耐光剤;金属不活性剤;ベンゾフェノン系紫外線吸収剤、ベンゾトリアゾール系紫外線吸収剤、トリアジン系紫外線吸収剤、サリシレート系紫外線吸収剤等の紫外線吸収剤;防菌・防黴剤;防臭剤;炭素系導電剤、金属系導電剤、金属酸化物系導電剤、界面活性剤等の導電性付与剤;分散剤;ポリエステル系可塑剤、グリセリン系可塑剤、多価カルボン酸エステル系可塑剤、リン酸エステル系可塑剤、ポリアルキレングリコール系可塑剤、エポキシ系可塑剤等の軟化剤(可塑剤);カーボンブラック、酸化チタン等の顔料、染料等の着色剤;ホスファゼン系化合物、リン酸エステル、縮合リン酸エステル、無機リン系難燃剤、ハロゲン系難燃剤、シリコーン系難燃剤、金属酸化物系難燃剤、金属水酸化物系難燃剤、有機金属塩系難燃剤、窒素系難燃剤、ホウ素化合物系難燃剤等の難燃剤;ドリッピング防止剤;制振剤;中和剤;ブロッキング防止剤;流動性改良剤;脂肪酸、脂肪酸金属塩等の離型剤;滑剤;耐衝撃性改良剤等が挙げられ、これらの1種又は2種以上を含有することができる。
本発明の複合積層体は後述する通り、A層を構成するフィルム(a3)と、B層を形成するシート(b3)を各々作製し、フィルム(a3)をシート(b3)の片面上又は両面上に積層配置して、得られた積層物を成形機により加熱及び加圧することでフィルム(a3)及びシート(b3)を一体化することにより得られる。
本発明の複合積層体を構成するB層は、平均繊維長が1mm以上である強化繊維(b1)と熱可塑性樹脂(b2)とを含有するシート(b3)から形成される層であり、複合積層体のコア層である。強化繊維(b1)の平均繊維長を1mm以上とすることで、優れた機械的物性の複合積層体を得ることができる。
シート(b3)に使用する強化繊維(b1)は、平均繊維長が1mm以上であれば特に限定されず、無機繊維、有機繊維、金属繊維、またはこれらの2種以上を組み合わせて使用できる。無機繊維としては、炭素繊維、黒鉛繊維、炭化珪素繊維、アルミナ繊維、タングステンカーバイド繊維、ボロン繊維、ガラス繊維などが挙げられる。有機繊維としては、アラミド繊維、ポリパラフェニレンベンズオキサゾール(PBO)繊維、高密度ポリエチレン繊維、その他一般のポリアミド繊維、ポリエステルなどが挙げられる。金属繊維としては、ステンレス、鉄等の繊維が挙げられ、また金属を被覆した炭素繊維でもよい。これらのなかでも炭素繊維、ガラス繊維およびアラミド繊維よりなる群から選ばれる少なくとも1種であることが好ましい。最終成形物の強度等の機械的物性をより一層向上させる観点から、炭素繊維が更に好ましい。炭素繊維とは、アクリル繊維やピッチ(石油、石炭、コールタール等の副生成物)等を原料に高温で炭化して製造した繊維であり、JIS規格では有機繊維の前駆体を加熱炭化処理して得られる、質量比で90%以上が炭素で構成される繊維と定義されている。アクリル繊維を使った炭素繊維はPAN系炭素繊維、ピッチを使った炭素繊維はピッチ系炭素繊維と称されている。
シート(b3)に使用する熱可塑性樹脂(b2)としては、繊維化又はフィルム化できる熱可塑性樹脂であれば特に限定はないが、例えば、ポリプロピレン(PP)樹脂、ポリエチレン(PE)樹脂、環状ポリオレフィン(COP)樹脂、環状オレフィン・コポリマー(COC)樹脂等のポリオレフィン樹脂;ポリスチレン(PS)樹脂、シンジオタクチックポリスチレン(SPS)樹脂、耐衝撃性ポリスチレン(HIPS)樹脂、アクリロニトリル−ブチレン−スチレン共重合体(ABS)樹脂、メタクリル酸メチル/スチレン共重合体(MS)、メタクリル酸メチル/スチレン/ブタジエン共重合体(MBS)、スチレン/ブタジエン共重合体(SBR)、スチレン/イソプレン共重合体(SIR)、スチレン/イソプレン/ブタジエン共重合体(SIBR)、スチレン/ブタジエン/スチレン共重合体(SBS)、スチレン/イソプレン/スチレン共重合体(SIS)、スチレン/エチレン/ブチレン/スチレン共重合体(SEBS)、スチレン/エチレン/プロピレン/スチレン共重合体(SEPS)等のポリスチレン系樹脂;ポリ乳酸(PLA)樹脂、ポリエチレンテレフタレート(PET)樹脂、ポリブチレンテレフタレート(PBT)樹脂、ポリシクロヘキセレンジメチレンテレフタレート(PCT)樹脂等のポリエステル系樹脂;ポリアセタール(POM)樹脂;ポリカーボネート(PC)樹脂;ポリアミド6樹脂、ポリアミド66樹脂、ポリアミド11樹脂、ポリアミド12樹脂、ポリアミド46樹脂、ポリアミド6C樹脂、ポリアミド9C樹脂、ポリアミド6樹脂とポリアミド66樹脂の共重合体(ポリアミド6/66樹脂)、ポリアミド6樹脂とポリアミド12樹脂の共重合体(ポリアミド6/12樹脂)等の脂肪族ポリアミド(PA)樹脂;ポリアミドMXD6樹脂、ポリアミドMXD10樹脂、ポリアミド6T樹脂、ポリアミド9T樹脂、ポリアミド10T樹脂等の芳香環を有する構造単位と有さない構造単位からなる半芳香族ポリアミド(PA)樹脂;ポリフェニレンサルファイド(PPS)樹脂;ポリエーテルサルフォン(PES)樹脂;液晶ポリエステル(LCP)樹脂;ポリエーテルケトン(PEK)樹脂、ポリエーテルエーテルケトン(PEEK)樹脂、ポリエーテルケトンケトン(PEKK)樹脂、ポリエーテルエーテルケトンケトン(PEEKK)等のポリエーテル芳香族ケトン樹脂;ポリエーテルイミド(PEI)樹脂;ポリアミドイミド(PAI)樹脂;熱可塑性ポリイミド(TPI)樹脂;ポリフッ化ビニリデン(PVDF)、ポリフッ化ビニル(PVF)、エチレン/テトラフルオロエチレン共重合体(ETFE)等のフッ素系樹脂等を例示することができる。上記熱可塑性樹脂から選ばれる相溶性のある2種以上の熱可塑性樹脂同士の混合物、すなわちポリマーアロイ等も使用できる。
本発明の複合積層体は、A層を形成するフィルム(a3)と、B層を形成するシート(b3)を各々作製し、フィルム(a3)をシート(b3)の片面上又は両面上に積層配置して、得られた積層物を成形機により加熱及び加圧することでフィルム(a3)及びシート(b3)を一体化することにより得られる。
本発明の複合積層体は、フィルム(a3)がシート(b3)と金型の間に配置されるように、フィルム(a3)をシート(b3)の片面上又は両面上に積層配置して、得られた積層物を成形機により加熱及び加圧することでフィルム(a3)及びシート(b3)を一体化することにより製造することができる。また、2枚以上(好ましくは2枚〜5枚)のフィルム(a3)を、シート(b3)の片面上又は両面上に積層配置してもよい。加熱工程の後に、冷却工程を実施することが好ましい。冷却を行なうことにより、熱可塑性樹脂が固化するので複合積層体の取り扱いが容易となる。
チタン酸カリウム(商品名:TISMO D101、大塚化学社製、平均繊維長:15μm、平均繊維径:0.5μm、平均アスペクト比:30)
ワラストナイト(商品名:バイスタルW、大塚化学社製、平均繊維長:25μm、平均繊維径:3μm、平均アスペクト比:8)
球状シリカ(商品名:SC2500−SEJ、アドマテックス社製、非晶質シリカ、球状粒子、体積平均粒子径0.6μm、比表面積6.0m2/g、表面処理剤:3−グリシドキシプロピルトリメトキシシラン)
ポリアミドMXD10樹脂(商品名:LEXTER8500、三菱瓦斯化学社製)
ポリアミド6樹脂(商品名:アミランCM1017、東レ社製)
板状タルク(商品名:TALC GH7、林化成社製、平均長径:5.8μm、厚み:0.1μm)
ガラス繊維(商品名:ECS 03T−289P/W、日本電気硝子社製、平均繊維長:3mm、平均繊維径:13μm)
表1に示す配合割合で、二軸押出機を用いて溶融混練し、ペレットを製造した。なお、二軸押出機のシリンダ温度は、試験例1〜試験例5が240℃、試験例6および試験例7が230℃であった。
(金型離型性)
金属板(鋼材 SS400 #2000仕上げ)上に、上記で得られた試験例1〜試験例5のフィルムの其々について、フィルム3枚、炭素繊維(平均繊維長70mm、平均繊維径7μm)にポリアミド6樹脂を含浸した炭素繊維シート(シートの厚み3mm、炭素繊維含有量51質量%)10枚、フィルム3枚、金属板(鋼材 SS400 #600仕上げ)の順に積層し、プレス機(放電精密加工研究所社製、商品名:ZENFormer 75t ダブルスライド機)にて天板温度270℃、予熱時間15分、圧力7MPa、加圧時間1分の条件にてプレスした。プレス後、室温まで冷却後、天板を上昇させ金属板と剥離させた。なお、フィルムを挿入せずに同条件でプレスしたものを比較例4とした。
上記で得られた試験例1〜試験例5のフィルムの其々について、フィルムと、炭素繊維(平均繊維長70mm、平均繊維径7μm)にポリアミド6樹脂を含浸した炭素繊維シート(シートの厚み3mm、炭素繊維含有量51質量%)とを、フィルム/炭素繊維シート/フィルムの構成になるように、プレス機に挟み込み、プレス機(放電精密加工研究所社製、商品名:ZENFormer 75t ダブルスライド機)にて天板温度270℃、予熱時間15分、圧力7MPa、加圧時間1分の条件にてプレスし、プレス後、室温まで冷却後、天板を上昇させ金属板と剥離することで複合積層体を製造した。得られた複合積層体のA層全体の厚みは163μm、B層の厚みは1.81mmであった。なお、フィルムを挿入せずに同条件でプレスしたものを比較例4とした。
最大高さ(Sz)の評価に用いた上記複合積層体をアブレシブウォータージェット装置により縦90mm×横50mm(平板)の形状に切削した。切削条件は、ノズル径φ0.76mm、水圧400MPa、速度200mm/min、水量約2.5L/min、研磨剤使用量:garnet(石榴石)#80を400g/minとした。
最大高さ(Sz)の評価に用いた上記複合積層体においてアブレシブウォータージェット装置により縦90mm×横50mm(平板)の形状に切削した。切削条件は、ノズル径φ0.76mm、水圧400MPa、速度200mm/min、水量約2.5L/min、研磨剤使用量:garnet(石榴石)#80を400g/minとした。
最大高さ(Sz)の評価に用いた上記複合積層体においてアブレシブウォータージェット装置によりJIS試験片(曲げ試験片)の形状に切削した。切削条件は、ノズル径φ0.76mm、水圧400MPa、速度200mm/min、水量約2.5L/min、研磨剤使用量:garnet(石榴石)#80を400g/minとした。なお、曲げ試験片の長さ方向が、試験例1〜試験例5におけるフィルムの引き出し方向と一致するように切削した。
(金型離型性)
金属板(鋼材 SS400)上に、上記で得られた試験例6〜試験例7のフィルムの其々について、フィルム、炭素繊維(平均繊維長30mm、平均繊維径7μm)にポリアミド6樹脂を含浸した炭素繊維シート(シートの厚み10mm、炭素繊維含有量50質量%)、イミドフィルム(商品名:UPILEX 75S、宇部興産社製)の順に積層し、プレス機(東洋精機社製、商品名:Mini Test Press MP−WCH)にて天板温度220℃、予熱時間1分、圧力2MPa、加圧時間1分の条件にてプレスした。プレス後、イミドフィルムを金属板の90°上方へ引き上げてイミドフィルムを金属板から剥離した。イミドフィルム剥離時に、イミドフィルムとともに金属板から複合積層体が完全に剥離したものを「A」、複合積層体の一部が金属板に残存したものを「B」、複合積層体が金属板から剥離せずにイミドフィルムのみが剥離したものを「C」とした。結果を表3に示した。
上記で得られた試験例6〜試験例7のフィルムの其々について、フィルムと、炭素繊維(平均繊維長30mm、平均繊維径7μm)にポリアミド6樹脂を含浸した炭素繊維シート(シートの厚み10mm、炭素繊維含有量50質量%)とを、フィルム/炭素繊維シートの構成になるように、2枚のイミドフィルム(商品名:UPILEX 75S、宇部興産社製)に挟み込み、プレス機(東洋精機社製、商品名:Mini Test Press MP−WCH)にて天板温度220℃、予熱時間1分、圧力2MPa、加圧時間1分の条件にてプレスし、プレス後にイミドフィルムを剥離することで複合積層体を製造した。得られた複合積層体のA層全体の厚みは65μm、B層の厚みは0.375mmであった。得られた複合積層体の表面(A層側)を、ISO 25178に準拠し、レーザー顕微鏡(キーエンス社製、商品名:VK−X250)を用いて、表面の最大高さ(Sz)を測定した。最大高さ(Sz)が70μm未満のものを「A」、70μm以上100μm未満のものを「B」、100μm以上のものを「C」とした。結果を表3に示した。
2…A層
3…B層
3a…第1の主面
3b…第2の主面
Claims (13)
- A層とB層とを備え、前記B層の片面上又は両面上に、直接的又は間接的に前記A層が設けられている複合積層体において、
前記A層が、平均繊維長が1μm〜300μmである強化繊維(a1)と、体積平均粒子径が0.01μm〜100μmである球状粒子(a11)と、熱可塑性樹脂(a2)とを含み、
前記B層が、平均繊維長が1mm以上である強化繊維(b1)と、熱可塑性樹脂(b2)とを含む、複合積層体。 - 前記強化繊維(a1)が、チタン酸カリウムおよびワラストナイトのうち少なくとも一方である、請求項1に記載の複合積層体。
- 前記球状粒子(a11)が、シリカ、アルミナおよびガラスビーズよりなる群から選ばれる少なくとも1種である、請求項1または請求項2に記載の複合積層体。
- 前記熱可塑性樹脂(a2)が、ポリオレフィン樹脂、ポリスチレン系樹脂、ポリエステル系樹脂、脂肪族ポリアミド樹脂、半芳香族ポリアミド樹脂、ポリフェニレンサルファイド樹脂、ポリエーテルサルフォン樹脂、ポリエーテル芳香族ケトン樹脂、ポリエーテルイミド樹脂および熱可塑性ポリイミド樹脂よりなる群から選ばれる少なくとも1種である、請求項1〜請求項3のいずれか一項に記載の複合積層体。
- 前記強化繊維(a1)の含有量が、前記A層に含まれる成分の全量100質量%中において0.5質量%〜30質量%である、請求項1〜請求項4のいずれか一項に記載の複合積層体。
- 前記球状粒子(a11)の含有量が、前記A層に含まれる成分の全量100質量%中において0.5質量%〜20質量%である、請求項1〜請求項5のいずれか一項に記載の複合積層体。
- 前記A層の厚みが500μm未満である、請求項1〜請求項6のいずれか一項に記載の複合積層体。
- 前記強化繊維(b1)が、炭素繊維、ガラス繊維およびアラミド繊維よりなる群から選ばれる少なくとも1種である、請求項1〜請求項7のいずれか一項に記載の複合積層体。
- 前記強化繊維(b1)の含有量が、前記B層に含まれる成分の全量100質量%中において10質量%〜80質量%である、請求項1〜請求項8のいずれか一項に記載の複合積層体。
- 前記熱可塑性樹脂(b2)が、ポリオレフィン樹脂、ポリスチレン系樹脂、ポリエステル系樹脂、脂肪族ポリアミド樹脂、半芳香族ポリアミド樹脂、ポリフェニレンサルファイド樹脂、ポリエーテルサルフォン樹脂、ポリエーテル芳香族ケトン樹脂、ポリエーテルイミド樹脂および熱可塑性ポリイミド樹脂よりなる群から選ばれる少なくとも1種である、請求項1〜請求項9のいずれか一項に記載の複合積層体。
- 前記B層の厚みが0.3mm以上である、請求項1〜請求項10のいずれか一項に記載の複合積層体。
- 自動車部材用又は電気・電子機器部材用である、請求項1〜請求項11のいずれか一項に記載の複合積層体。
- 請求項1〜請求項12のいずれか1項に記載の複合積層体の製造方法であって、
平均繊維長が1mm以上である強化繊維(b1)と、熱可塑性樹脂(b2)とを含むシート(b3)の片面上または両面上に、平均繊維長が1μm〜300μmである強化繊維(a1)と、体積平均粒子径が0.01μm〜100μmである球状粒子(a11)と、熱可塑性樹脂(a2)とを含むフィルム(a3)を積層配置し、前記積層配置された積層物を加熱及び加圧することでシート(b3)及びフィルム(a3)を一体化する、複合積層体の製造方法。
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