JP5876231B2 - 発泡形成用樹脂組成物の製造方法および製造された発泡形成用樹脂組成物を用いた樹脂発泡体の製造方法 - Google Patents
発泡形成用樹脂組成物の製造方法および製造された発泡形成用樹脂組成物を用いた樹脂発泡体の製造方法 Download PDFInfo
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- JP5876231B2 JP5876231B2 JP2011120734A JP2011120734A JP5876231B2 JP 5876231 B2 JP5876231 B2 JP 5876231B2 JP 2011120734 A JP2011120734 A JP 2011120734A JP 2011120734 A JP2011120734 A JP 2011120734A JP 5876231 B2 JP5876231 B2 JP 5876231B2
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Description
特徴とする。
オレフィン系樹脂としての低密度ポリエチレン(LDPE1)(日本ポリエチレン(株)製,JF414A)、超臨界二酸化炭素逆相蒸発法により相溶化処理された澱粉としての澱粉類澱粉マスター(アクテイブ(株)製、澱粉含有率50重量%:発泡スターチ50%、商品名NVC−SH50)、ステアリン酸アミド、エチレンビスステアリルアミド、グリセリンモノパルミチン酸エステル、グリセリンモノステアリン酸エステルおよびタルクを、表1に示す割合で用いて、押出機(50φ(第1ステージ)/60φ(第2ステージ))を用いて、第1ステージで混練溶融させつつ、表1に示す割合の発泡剤を注入した。さらに、第2ステージで、混合物をさらに均一に混練して、冷却しつつ、ダイから混合物を棒状(25φ)に押出し、引き取って発泡体を得た。
オレフィン系樹脂としての低密度ポリエチレン(LDPE2)((株)東ソー製,ペトロセン310)、高密度ポリエチレン(HDPE)((株)東ソー製、2500)、EVA樹脂((株)東ソー製、ウルトラセン751)およびポリプロピレン(住友化学(株)製、FS3012)、超臨界二酸化炭素逆相蒸発法により相溶化処理された澱粉としての澱粉マスター(アクテイブ(株)製、澱粉含有率50重量%:発泡スターチ50%、商品名NVC−SH50)、ステアリン酸アミドおよびタルクを、表2に示す割合で用いて、押出機(50φ/60φ)を用いて第1ステージで混練溶融させつつ、表2に示す割合の発泡剤を注入した。さらに第2ステージで、混合物をさらに均一に混練して冷却しつつ、ダイスから混合物を棒状(25φ)に押出し、引き取って発泡体を得た。
ポリオレフィン系樹脂としての低密度ポリエチレン(LDPE1)(日本ポリエチレン(株)製,JF414A)、超臨界二酸化炭素逆相蒸発法により相溶化処理された澱粉としての澱粉マスター(アクテイブ(株)製、澱粉含有率50重量%:発泡スターチ50%、商品名NVC−SH50)、ステアリン酸アミドおよびタルクを、表1に示す割合で用いて、押出機(50φ(第1ステージ)/60φ(第2ステージ))を用いて、第1ステージで混練溶融させつつ、表2に示す割合の発泡剤を注入した。さらに、第2ステージで、混合物をさらに均一に混練して、冷却しつつ、ダイから混合物を花型断面形状(30φ)に押出し、引き取って発泡体を得た。
2 相溶化剤
3 オレフィン系樹脂
Claims (8)
- オレフィン系樹脂と、超臨界状態にある二酸化炭素と水のエマルジョンを形成した後、減圧して二酸化炭素の膨張を利用して転相を実行することで、相溶化剤がリポソームによってナノカプセル化させた相溶化剤水分散液を得る工程と、相溶化剤水分散液と澱粉類とを混合する工程とを有する処理からなる超臨界二酸化炭素逆相蒸発法により相溶化処理された澱粉類とを混合処理して発泡形成用樹脂組成物を製造することを特徴とする発泡形成用樹脂組成物の製造方法。
- 前記澱粉類が、澱粉、エーテル化澱粉、エステル化澱粉から選択された少なくとも一種であることを特徴とする請求項1に記載の発泡形成用樹脂組成物の製造方法。
- 前記澱粉類と前記オレフィン系樹脂との割合(重量比)が、澱粉類/オレフィン系樹脂=1/99〜60/40であることを特徴とする請求項1または請求項2に記載の発泡形成用樹脂組成物の製造方法。
- 前記オレフィン系樹脂に加えて脂肪酸アミドおよび脂肪酸エステルから選択された少なくとも一種の化合物を含有させることを特徴とする請求項1から請求項3のいずれか1項に記載の発泡形成用樹脂組成物の製造方法。
- 請求項1から請求項4のいずれか1項に記載の製造方法により製造された発泡形成用樹脂組成物を、少なくともイソブタンを含有する有機系物理発泡剤を用いて発泡形成して樹脂発泡体を製造することを特徴とする樹脂発泡体の製造方法。
- 前記有機系物理発泡剤の沸点を、発泡剤全体の平均として−40℃〜+15℃とすることを特徴とする請求項5に記載の樹脂発泡体の製造方法。
- 前記有機系物理発泡剤を、イソブタン単独で形成された発泡剤、またはイソブタンと、n−ブタン、n−ペンタンおよびイソペンタンから選択された少なくとも一種との混合物からなる発泡剤とし、イソブタンを40重量%以上の割合で含有させることを特徴とする請求項5または請求項6に記載の樹脂発泡体の製造方法。
- 前記発泡形成による発泡倍率を18〜90倍とし、密度を0.01〜0.05g/cm3とすることを特徴とする請求項5から請求項7のいずれか1項に記載の樹脂発泡体の製造方法。
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