JPWO2019021996A1 - 樹脂組成物、その製造方法及びそれを用いた多層構造体 - Google Patents
樹脂組成物、その製造方法及びそれを用いた多層構造体 Download PDFInfo
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- JPWO2019021996A1 JPWO2019021996A1 JP2018562684A JP2018562684A JPWO2019021996A1 JP WO2019021996 A1 JPWO2019021996 A1 JP WO2019021996A1 JP 2018562684 A JP2018562684 A JP 2018562684A JP 2018562684 A JP2018562684 A JP 2018562684A JP WO2019021996 A1 JPWO2019021996 A1 JP WO2019021996A1
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- polyolefin
- layer
- modified polyolefin
- resin composition
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- Granted
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Abstract
Description
0.005≦(X/Y)≦0.13 (1)
0.005≦(X/Y)≦0.13 (1)
JIS K 7210に準拠して樹脂のMFRを測定した。
JIS K 2501に基づいて、酸変性ポリオレフィンの酸価を測定し、酸価から酸変性量(mmol/g)を算出した。溶剤はキシレンを使用した。
JIS K 7110に準じてIZOD衝撃強度測定を行った。射出成形機(日精製、FS−80S)を用いて、樹脂組成物ペレットの射出成形を行った後、得られた成形品(長さ80mm、幅10mm、厚さ4mm)をノッチング加工することにより試験片を得た。デジタル衝撃試験機(株式会社東洋精機製作所製)を用い、得られた試験片の23℃および−40℃におけるIZOD衝撃強度(kJ/m2)を測定した。
樹脂組成物ペレットの切断面を電子染色し、走査電子顕微鏡で観察することにより、ポリオレフィン(A)中に分散したEVOH(B)の粒径を求めた。
燃料容器に、エチレングリコールを内容積に対して60体積%充填し、−40℃の冷凍室に3日間放置した後、コンクリート上に落下させ、ボトルが破壊(容器内部のエチレングリコールが漏れる)する落下高さを求めた。破壊高さは、n=30の試験結果を用いて、JIS試験法(K7211の「8.計算」の部分)に示される計算方法を用いて、50%破壊高さを求めた。
・A1:密度0.900g/cm3、MFR(190℃、2.16kg荷重下で測定)1g/10minであるポリプロピレン
・A2:密度0.945g/cm3、MFR(190℃、2.16kg荷重下で測定)0.03g/10minである高密度ポリエチレン
・B1:エチレン含有量32モル%、けん化度99.9モル%、MFR(190℃、2.16kg荷重)1.6g/10min、密度1.19g/cm3であるEVOH
・C1:三井化学株式会社製無水マレイン酸グラフト変性ポリプロピレン「ADMER(登録商標) QF500」[密度0.900g/cm3、MFR(190℃、2.16kg荷重下で測定)1.1g/10min、酸価1.1mgKOH/g]
・C2:三井化学株式会社製無水マレイン酸グラフト変性ポリエチレン「ADMER(登録商標) GT6」[密度0.92g/cm3、MFR(190℃、2.16kg荷重下で測定)1.1g/10min、酸価1.5mgKOH/g]
・D1〜D8:
ポリプロピレン(PP、密度0.91g/cm3)、無水マレイン酸(MAn)及び2,5−ジメチル−2,5−ビス(t−ブチルパーオキシ)ヘキサン(開始剤)を溶融混練した後、ペレット化して得られた無水マレイン酸グラフト変性ポリプロピレン(D1〜D8)を用いた。無水マレイン酸グラフト変性ポリプロピレン(D1〜D8)の酸価及びMFR(190℃、2.16kg荷重下で測定)を表1に示す。
・D9〜D15:
高密度ポリエチレン(密度0.95g/cm3であるPE1又は密度0.93g/cm3であるPE2)、無水マレイン酸及び2,5−ジメチル−2,5−ビス(t−ブチルパーオキシ)ヘキサンを溶融混練した後、ペレット化して得られた無水マレイン酸グラフト変性ポリエチレン(D9〜D15)を用いた。無水マレイン酸グラフト変性ポリエチレン(D9〜D15)の酸価及びMFR(190℃、2.16kg荷重下で測定)を表2に示す。
[回収助剤の製造]
ポリプロピレン(A1)25質量部、無水マレイン酸グラフト変性ポリプロピレン(D1)75質量部をドライブレンドしてから、二軸押出機(株式会社東洋精機製作所製「2D25W」、径25mm)を用いて、215℃にて溶融混練した後、ペレタイザーを用いてペレット化して回収助剤を得た。
得られた回収助剤2.4質量部、ポリプロピレン(A1)100質量部、EVOH(B1)8.6質量部、無水マレイン酸グラフト変性ポリプロピレン(C1)10質量部をドライブレンドした後、単軸押出機(プラスチック工学研究所社製「GT−40−26」径40mm)を用いて、215℃にて溶融混練した後、ペレット化して樹脂組成物(E)ペレットを得た。このときの溶融混練条件を以下に示す。得られた樹脂組成物(E)ペレットを再度同じ単軸押出機に投入して同じ条件で溶融混練した後、ペレット化して樹脂組成物(E)ペレットを得た。得られた樹脂組成物(E)ペレットを同様に溶融混練する工程をさらに3回繰り返した。前記単軸押出機に低密度ポリエチレンを供給して15分間運転した後、スクリュー及びダイを取り外してスクリュー付着物及び目ヤニ(ダイへの付着物)をそれぞれ採取して、秤量した。また、得られた樹脂組成物(E)ペレット(溶融混練を5回繰り返したもの)の耐衝撃性及び分散性を上記の方法により評価した。これらの結果を表3に示す。
スクリュー回転数:95rpm
シリンダー、ダイ温度設定:C1/C2/C3/C4/C5/D=200℃/215℃/215℃/215℃/215℃/215℃
前記回収助剤、EVOH(B)、酸変性ポリオレフィン(C)の添加量を表3に示すとおりに変更した以外は実施例1と同様にして樹脂組成物(E)ペレットの作製及び評価(溶融混練の繰り返し数と目ヤニ付着量との関係の評価を除く)を行った。結果を表3に示す。
酸変性ポリオレフィン(D)の種類を表3に示すとおりに変更した以外は実施例1と同様にして樹脂組成物(E)ペレットの作製及び評価(溶融混練の繰り返し数と目ヤニ付着量との関係の評価を除く)を行った。結果を表3に示す。
酸変性ポリオレフィン(D)のみからなる回収助剤を用いたこと以外は、実施例1と同様にして樹脂組成物(E)ペレットの作製及び評価(溶融混練の繰り返し数と目ヤニ付着量との関係の評価を除く)を行った。結果を表3に示す。
回収助剤の代わりにポリプロピレン(A1)のみを用いたこと以外は、実施例1と同様にして樹脂組成物ペレットの作製及び評価を行った。結果を表3及び図1に示す。
ポリオレフィン(A)、酸変性ポリオレフィン(C)及び酸変性ポリオレフィン(D)の種類を表4に示すとおりに変更した以外は実施例1と同様にして樹脂組成物(E)ペレットの作製及び評価を行った。溶融混練の繰り返し数と目ヤニ付着量との関係の評価は実施例10のみ行った。結果を表4及び図2に示す。
前記回収助剤、EVOH(B)、酸変性ポリオレフィン(C)の添加量を表4に示すとおりに変更した以外は実施例10と同様にして樹脂組成物(E)ペレットの作製及び評価(溶融混練の繰り返し数と目ヤニ付着量との関係の評価を除く)を行った。結果を表4に示す。
酸変性ポリオレフィン(D)のみからなる回収助剤を用いたこと以外は、実施例10と同様にして樹脂組成物(E)ペレットの作製及び評価(溶融混練の繰り返し数と目ヤニ付着量との関係の評価を除く)を行った。結果を表4に示す。
回収助剤の代わりに高密度ポリエチレン(A2)のみを用いたこと以外は、実施例10と同様にして樹脂組成物ペレットの作製及び評価を行った。結果を表4及び図2に示す。
[回収物の製造]
ポリプロピレン(A1)、EVOH(B1)及び無水マレイン酸グラフト変性ポリプロピレン(C1)を用いて、下記の条件にて3種5層の多層フィルム(A1:208μm/C1:16μm/B1:32μm/C1:16μm/A1:208μm)を作製した。
・ポリプロピレン(A1)
押出機: 32mmφ押出機 GT−32−A(プラスチック工学研究所社製)
押出温度: 供給部/圧縮部/計量部/ダイ=170/210/220/220℃
ダイ: 300mm幅コートハンガーダイ(プラスチック工学研究所社製)
・EVOH(B)
押出機: 20mmφ押出機 ラボ機ME型CO−EXT(株式会社東洋精機製作所製)
押出温度: 供給部/圧縮部/計量部/ダイ=180/210/220/220℃
ダイ: 300mm幅コートハンガーダイ(プラスチック工学研究所社製)
・無水マレイン酸グラフト変性ポリプロピレン(C1)
押出機: 20mmφ押出機 SZW20GT−20MG−STD(株式会社テクノベル製)
押出温度: 供給部/圧縮部/計量部/ダイ=170/210/220/220℃
ダイ: 300mm幅コートハンガーダイ(プラスチック工学研究所社製)
得られた回収物118.6質量部及び実施例1で得られた回収助剤2.4質量部をドライブレンドして混合樹脂を得た。得られた混合樹脂、ポリプロピレン(A1)、EVOH(B1)及び無水マレイン酸グラフト変性ポリプロピレン(C1)を用いて、4種6層の多層フィルム(A1:208μm/混合樹脂[樹脂組成物(E)]:320μm/C1:16μm/B1:32μm/C1:16μm/A1:208μm)を作製した。このとき、ポリプロピレン(A1)、EVOH(B)、無水マレイン酸グラフト変性ポリプロピレン(C1)は、上述した回収物を製造する条件と同じ条件で成形し、混合樹脂[樹脂組成物(E)層]は、以下の条件で成形した。
押出機: 32mmφ押出機 GT−32−A(プラスチック工学研究所社製)
押出温度: 供給部/圧縮部/計量部/ダイ=170/210/220/220℃
ダイ: 300mm幅コートハンガーダイ(プラスチック工学研究所社製)
A:多層フィルムにスジが観察された。
B:多層フィルムにスジが観察されなかった。
ポリプロピレン(A1)の代わりに高密度ポリエチレン(A2)を用いたこと、無水マレイン酸グラフト変性ポリプロピレン(C1)の代わりに無水マレイン酸グラフト変性ポリエチレン(C2)を用いたこと及び無水マレイン酸グラフト変性ポリプロピレン(D1)の代わりに無水マレイン酸グラフト変性ポリエチレン(D9)を用いたこと以外は実施例18と同様にして多層フィルムの作製及び評価を行った。結果を表5に示す。
回収助剤の代わりにポリプロピレン(A1)のみを用いたこと以外は実施例18と同様にして多層フィルムの作製及び評価を行った。結果を表5に示す。
回収助剤の代わりに高密度ポリエチレン(A2)のみを用いたこと以外は実施例19と同様にして多層フィルムの作製及び評価を行った。結果を表5に示す。
ポリオレフィン(A)としてA2、EVOH(B)としてB1、酸変性ポリエチレン(C)として無水マレイン酸グラフト変性ポリエチレン(C2)、回収物として実施例10の樹脂組成物(E)ペレット(溶融混練を5回繰り返したもの)を用い、鈴木製工所製押出ブロー成形機「TB−ST−6P」にて210℃(内側)A/C/B/C/E/A(外側)の層構成の4種6層パリソンを押し出し、15℃の金型内でブローし、20秒冷却して全層厚み2050μm[(内側)A/C/B/C/E/A(外側)=350/50/50/50/850/700μm]の500mL燃料容器(底面直径は100mm、高さは64mm)を成形した。得られた燃料容器を50%破壊高さの評価に用いた。評価結果を表6に示す。
層構成を(内側)A/C/E/C/B/A(外側)=350/50/850/50/50/700μmとした以外は、実施例20と同様に燃料容器を成形し、50%破壊高さを評価した。評価結果を表6に示す。
実施例10の樹脂組成物(E)の代わりに、比較例4または5の樹脂組成物を用いた以外は実施例20と同様に燃料容器を成形し、50%破壊高さを評価した。評価結果を表6に示す。
Claims (7)
- ポリオレフィン(A)100質量部に対し、エチレン−ビニルアルコール共重合体(B)を0.1〜20質量部、酸変性ポリオレフィン(C)を0.1〜20質量部、酸変性ポリオレフィン(D)を0.1〜10質量部含有し、
ポリオレフィン(A)のMFR(190℃、2.16kg荷重下)が0.01〜10g/10minであり、
酸変性ポリオレフィン(C)の酸価が0.1〜9mgKOH/gであり、
酸変性ポリオレフィン(D)の酸価が10mgKOH/gを超えて、120mgKOH/g以下であり、かつ
ポリオレフィン(A)のMFR(190℃、2.16kg荷重下)に対する酸変性ポリオレフィン(D)のMFR(190℃、2.16kg荷重下)の比(D/A)が50以上である、樹脂組成物(E)。 - ポリオレフィン(A)層、エチレン−ビニルアルコール共重合体(B)層及び酸変性ポリオレフィン(C)層を含む多層構造体の回収物と、酸変性ポリオレフィン(D)を含有する回収助剤とを溶融混練する請求項1に記載の樹脂組成物(E)の製造方法。
- 請求項1に記載の樹脂組成物(E)層、ポリオレフィン(A)層、エチレン−ビニルアルコール共重合体(B)層及び酸変性ポリオレフィン(C)層を含む多層構造体。
- 請求項1に記載の樹脂組成物(E)層を有する、燃料容器。
- さらにポリオレフィン(A)層、エチレン−ビニルアルコール共重合体(B)層及び酸変性ポリオレフィン(C)層を有し、
(B)層の内外層に(C)層を介して、(A)層又は樹脂組成物(E)層を有する、請求項4に記載の燃料容器。 - エチレン−ビニルアルコール共重合体(B)層の内側にある各層の厚みの合計をIとし、(B)層の外側にある各層の厚みの合計をOとしたときの厚み比(I/O)が50/50より小さく、かつ
(B)層の厚みをXとし、全体厚みをYとしたときの厚み比(X/Y)が下記(1)式を満足する、請求項5に記載の燃料容器。
0.005≦(X/Y)≦0.13 (1) - ポリオレフィン(A)及び酸変性ポリオレフィン(D)を含有し、
ポリオレフィン(A)に対する酸変性ポリオレフィン(D)の質量比(D/A)が0.1〜10であり、
ポリオレフィン(A)のMFR(190℃、2.16kg荷重下)が0.01〜10g/10minであり、
酸変性ポリオレフィン(D)の酸価が10mgKOH/gを超えて、120mgKOH/g以下であり、かつ
ポリオレフィン(A)のMFR(190℃、2.16kg荷重下)に対する酸変性ポリオレフィン(D)のMFR(190℃、2.16kg荷重下)の比(D/A)が50以上である、回収助剤。
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